奥地利专利AT523853A1 Clamping unit, forming machine and method of measuring a force distribution

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专利摘要:
Closing unit (1) for a molding machine, comprising a fixed mold clamping plate (2) with a first clamping area (16) for clamping at least one first mold part (5) and a movable mold clamping plate (3) with a second clamping area for clamping at least a second mold part (6) , wherein at least one area sensor (7) arranged on the fixed mold clamping plate (2) and/or on the movable mold clamping plate (3) is provided, which is designed to determine a force distribution (8) in the first clamping area (16) and/or in the second to measure the clamping area.
公开号:AT523853A1
申请号:T50450/2020
申请日:2020-05-20
公开日:2021-12-15
发明作者:Buchner Dipl Ing Manuel；Schott Dipl Ing Günter
申请人:Engel Austria Gmbh；
IPC主号:

专利说明:

The present invention relates to a clamping unit for a molding machine with the features of the preamble of claim 1, a molding machine with such a clamping unit and a method for measuring a
Force distribution in a clamping unit.
Generic clamping units for a molding machine have a fixed mold platen with a first clamping area for clamping at least one first mold tool and a movable mold clamping plate with a second clamping area for clamping at least a second one
Mold part on.
Shaping machines can be understood to mean injection molding machines, transfer presses, presses and the like. The state of the art is briefly outlined below using an injection molding machine. The same applies
of course general for molding machines.
Closing units of injection molding machines usually have a fixed platen and a movable platen that can be moved relative thereto. A mold can be attached in a clamping area on each of these platens, so that the respective mold, which is attached to the movable platen, can be moved relative to the mold part, which is attached to the fixed platen. When the mold is in a closed state (in which the mold parts are in contact or almost in contact), the mold parts form a mold cavity which can be opened by moving the movable platen so that mold parts can be removed from the mold cavity of the mold or
if necessary inserts can be placed there. In injection molding machines, when the mold is closed, a
Plasticized plastic are injected, which the increased pressure
Mold cavity is supplied. As a result of this injection pressure it comes to
Forces which cause the tool to rise, these forces being counteracted by the clamping unit by applying a compressive force (a
Closing force) is applied to the mold.
In order to be able to optimally affect this closing force on the tool, it is necessary to align the tool in such a way in the clamping areas of the fixed platen and the movable platen that the closing force with its resulting direction of action essentially corresponds to the
Direction of action of the resulting lifting force coincides.
If these forces do not essentially coincide with their direction of action, considerable deformations of the clamping unit occur (force and distance lead to bending moments), with the quality of the molded parts produced being impaired
can be impaired and the locking unit can also be damaged.
In the case of clamping units with guide pillars, an asymmetrical load can lead to increased wear on the guide elements, since these are loaded unevenly in the closing cycle and can even jam slightly. With the short cycle times or increased cycle frequencies, wearing elements can be worn out in just a few hours or days, which of course has a negative effect on the productivity of a clamping unit (and thus the
injection molding machine).
In order to determine a force distribution during the production cycle, it is known from the prior art, for example, to determine a closing force via the deformation of the guide columns or bars and to derive a force distribution from this. However, the limited number of guide columns or spars results in a limited possibility of dissolving the force distribution, since only
is measured selectively.
The object of the present invention is to provide a closing unit and a method with which it is possible to obtain information about a distribution of forces with greater or more precise quality than in the prior art
within the clamping areas for a mold part.
This object is solved by the present invention by a clamping unit for a molding machine having the features of claim 1, as well as
by means of a method with the features of claim 10.
According to the invention it is provided that at least one surface sensor is provided which is arranged on the fixed platen and/or on the movable platen and which is designed to determine a force distribution in the
to measure the first clamping area and/or in the second clamping area.
By providing a surface sensor on the fixed platen in a first clamping area for clamping at least one first mold part and/or on a movable mold platen in a second clamping area for clamping at least one second mold part, a force distribution can be eliminated in a simple manner
can be determined over the area.
The arrangement according to the invention makes it easy to retrofit even existing systems in order to distribute force in a clamping area of a fixed mold clamping plate for clamping a first mold part and/or in a clamping area of a movable mold clamping plate for clamping a
second mold part to detect.
For example, a clamping force profile can be created via the force distribution, for example to detect deformations or deformation of the clamping unit and/or the fixed platen and/or the movable platen and/or the first mold part and/or the second
Mold part and / or another component of the clamping unit
to infer Measures can then be taken to reduce or eliminate the deformations found. Such measures can include, for example, aligning the tool parts in the mounting areas or providing geometric solutions (preferably crowning (i.e. convex design of the clamping surface) of a
mold mounting plate or a mold).
In the same way, it is entirely conceivable to determine a tearing force—preferably during production—and, if necessary, to take measures to avoid, reduce or adjust the force distribution of the tearing force. In this way, the components of the shaping machine and/or the shaping tool can be protected and their service life (=service life) can be increased, as can the energy consumption in terms of ecological and economic considerations
Operation of the molding machine can be minimized.
However, it is also quite conceivable to only carry out a measurement using a surface sensor in the course of a test setup in order to use the collected data to make changes to the mold or the clamping unit as early as the development phase of the mold and/or the closing unit
to do.
By using at least one surface sensor, which can only be a few hundredths of a millimeter to tenths of a millimeter thick, the later process of the closing unit is not impaired. In addition, such area sensors have a very high resistance - especially with regard to pressure loads and shearing forces that could occur due to any deformation of the clamping plates, the clamping unit itself or the mold - on,
making them particularly robust for use.
Molding machines can include injection molding machines, transfer presses,
Presses or the like are understood.
In the course of the present document — when a plate is mentioned — it is not necessarily to be assumed that it is a flat, flat plate. This can also have depressions and elevations. There are also versions with ribs for stabilization or for generating a certain deformation behavior
quite conceivable.
In the course of the present document, clamping areas are to be understood as meaning those parts or components of the clamping plates which adjoin the mold or a mold part and/or a flow of force through this
Experienced.
Any mold carrier element which is designed to be movable relative to the fixed mold clamping plate can be understood as a movable mold clamping plate in the context of the invention, provided it carries a mold part. For example, in the prior art known center plates can thus in
Sense of the invention are understood as movable platens.
In this respect, on the one hand embodiments are conceivable which have both a movable mold clamping plate in the form of a center plate, for example, and a “conventional” movable mold clamping plate. On the other hand, of course, embodiments are also conceivable in which the area sensors according to the invention are only on the middle plate (i.e. a movable mold mounting plate
within the meaning of the invention) are present.
In the course of the present document - when talking about a surface sensor - it is not necessarily to be assumed that it is a flat, planar sensor with a constant thickness. This can also have indentations, recesses and elevations. The execution by a large number of sensor elements along a plane for detecting a force distribution (by means of a large number of measured values, which are essentially simultaneously measured by a large number of sensors
is detected) is quite conceivable.
Advantageous embodiments of the invention are in the dependent claims
Are defined.
It can be provided that the at least one surface sensor is designed as a pressure-sensitive sensor and preferably has a piezoelectrically and/or pyroelectrically activated or activatable layer. The use of piezoelectric and/or pyroelectric layers provides a particularly accurate and high-resolution measurement method for a force distribution that is as close as possible to the production process of the shaping machine
has no effect.
The production of piezoelectrically and pyroelectrically activated or activatable layers (using inorganic particles) is, for example, from
EP 2 609 142 B1. This is done by applying a solution and/or a suspension, which contains the piezoelectrically and pyroelectrically activated or activatable particles, and then removing the suspension and/or the solvent. Those disclosed in this regard in EP 2 609 142 B1
Measures can be preferably used in the present invention.
This makes it possible to produce a solution that additionally contains inorganic particles of a piezoelectrically and pyroelectrically active or activatable oxide (an oxide ceramic). Examples are PZT (lead zirconate titanate), BTO (barium titanate), PTO (lead titanate) and BNT-BT (bismuth sodium titanate — barium titanate). For this purpose, a suspension of the inorganic particles is first prepared in a suitable, preferably low-boiling, suspension medium. This makes it possible to combine the suspension with a PVDF or PVDF copolymer solution by spinning, squeegeeing or screen printing onto a substrate for the area sensor, with the solvent being able to be removed by the action of temperature to harden the layer. The substrate can, for example, be a film and/or directly the solid
Be mold platen and / or the movable mold platen.
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Provision can be made for the at least one surface sensor to have at least one conductor track or electrode which is arranged on the fixed mold clamping plate and/or the movable mold clamping plate. Accordingly, it can also be possible for a force distribution to be determined via a change in a capacitance of the at least one conductor track or electrode on the fixed mold clamping plate and/or the movable mold clamping plate. The Conductor
can of course also be regarded as an electrode and function as such.
However, at least two conductor tracks or electrodes are preferably provided, which are preferably layered on top of one another, with these two conductor tracks or electrodes forming a capacitor. Voltage changes caused by changes in the position of the at least two conductor tracks or electrodes relative to one another (for example, deformations caused by the action of force) lead to measurable electrical voltages between the
at least two conductor tracks or electrodes.
For a preferred embodiment of the structure of the area sensor, reference can be made to WO 2014/037016 A1. Accordingly, the following layer structure can be provided for the surface sensor:
- a first layer formed by a mold platen or a film (e.g. polyethylene terephthalate substrate, PET) applied to a mold platen
- a (lower) electrode or electrodes in a second layer formed of a conductive polymer material;
- a piezoelectric and pyroelectric sensor material consisting, for example, of polyvinylidene difluoride (PVDF) and trifluoroethylene (TrFE), and
- a (upper) electrode or electrodes made either of carbon or of
conductive polymer.
Provision is preferably made for the area sensor to have a large number of sensor elements - for example in a grid arrangement - along a plane for detecting a force distribution (by means of a large number of measured values which are
essentially detected simultaneously by a large number of sensors),
where the sensor elements optionally overlap and are particularly preferred
are connected to each other for signal transmission.
Provision can be made for the layer designed as a surface sensor to be a film (e.g. plastic film) or on a plate (e.g. a thin
Sheet metal plate or the mold mounting plate) is formed.
Provision can be made for at least one further conductor track to be provided, with a capacitance or the change in capacitance being determined between the two conductor tracks. However, it is also quite conceivable that only one conductor track is provided and the capacitance of the conductor track to the fixed platen or the movable platen or a first one
or second mold part is used.
Provision can be made for the at least one surface sensor to have a film, with the at least one surface sensor being attached to the fixed platen and/or the movable platen,
glued in particular, is.
Provision is preferably made for the at least one surface sensor to be attached to the fixed surface by a printing process—preferably a screen printing process
Mold platen and / or the movable mold platen is applied.
It can be provided that the at least one surface sensor on a clamping device - preferably a holding claw - for clamping a mold on the fixed mold platen and / or the movable
Mold mounting plate is arranged.
It is preferably provided that the at least one surface sensor is at least partially on a surface of the fixed platen and/or the movable platen facing the first and/or second mold part
Mold mounting plate is arranged.
Arranging the at least one surface sensor on a surface facing the first and/or second mold part makes it possible to detect a closing force exerted on the mold via the
area (in other words: a force distribution).
Furthermore, the filling of the mold cavity can be evaluated, observed and/or checked during the process by drawing conclusions about a situation in the mold cavity from the change in the distribution of closing force and by relating this change to the injection force or the injection pressure. If changes in the force distribution are detected during ongoing operation, a change in the filling of the mold cavity can thus also be concluded and, if necessary, an occurring one
Errors are detected.
Provision can be made for the at least one area sensor to be arranged in the clamping area when a mold part is clamped between the entire contact surface of the mold part with the fixed mold clamping plate and/or the movable mold clamping plate, or only in a partial area. Furthermore, it is quite conceivable that the area sensor is also designed to be larger than this contact area. This has the special advantage that higher and/or non-linear force distributions in
an edge area of the mold can be determined.
By providing the area sensor on a clamping device, not only can a closing force be determined, which is exerted by the closing unit on a mold part, but also the tearing force required to open the
Forming tool can be used to be monitored.
In order to monitor or determine a tearing force, for example, the pretension, more precisely: the change in the pretension of the clamping device, can be observed and thus a tearing force
can be inferred.
Furthermore, however, it can also be provided, for example, that the clamping of a mold is detected or monitored by arranging the area sensor on a clamping device in order to determine, if necessary, a reduction in the holding force and a loosening of the mold on the movable and/or the fixed mold clamping plate and in good time to be able to issue a warning and/or initiate countermeasures
be able.
Protection is also sought for a shaping machine, preferably one
Injection molding machine with a closing unit according to the invention.
In relation to a method according to the invention it is provided that the force distribution in the first clamping area and / or in the second clamping area by means of at least one on the fixed platen and / or the
movable platen arranged area sensor is measured.
As already mentioned, it can be provided that the detected force distribution to determine a deformation of the fixed platen and / or
moving platen is used under clamping force.
Based on the detected deformation, a geometry of the fixed platen and/or the movable platen and/or the
first tool part and / or the second mold part are adjusted.
If an evaluation according to the invention is already available during the development phase of the clamping unit, it can still be provided in the course of development that the fixed platen and/or the movable platen and/or the first mold part and/or the second mold part are crowned on their contact surfaces or to design a different geometry, which in a later consequence a deformation under closing force -
at least partially — compensate.
However, it can also be provided that the surface sensor is connected to active materials on the fixed platen and/or the movable platen, which change their geometry through activation, control and/or regulation, which also causes a deformation
Closing force can be compensated.
Active materials of this type are characterized by a high force density and a high number of almost wear-free deformation cycles. Force density is a measure of the magnitude of a force that a material of unit volume can exert. Since, for example, high clamping forces have to be achieved in injection molding processes, materials with a high force density are of course advantageous with regard to
a minimization of the installation space.
It can be provided that the active material is a piezoelectric material (can be e.g. crystals, polymers or ceramics), a shape memory alloy (can be e.g. crystals or polymers).
magnetostrictive material and/or an electrostrictive material.
Piezoelectric materials and electrostrictive materials are materials that change length when exposed to an electric field. Magnetostrictive materials change their length under the influence of a magnetic field. Shape memory alloys exhibit phase transitions, with different solid phases having different shapes. In particular, a change in length can occur as a result of the deformation that occurs during the phase transition. The phase transition is characterized by a
induced temperature change. Preferably, it can be provided that the detected force distribution
Determination or monitoring of a clamping force of a mold
is used.
It can be provided that the recorded force distribution is used to determine a process parameter—preferably an opening force and/or a closing force—
used during the operation of the clamping unit.
Further details and embodiments of the invention are based on the figures
as well as the associated description of the figures. It shows:
1 shows a closing unit according to the invention under closing force,
2 shows a clamping area of a fixed platen or a movable platen,
Fig. 3a-c force distributions on a fixed or movable platen
4 shows a closing unit according to the invention with a mold opening,
Fig. 5a-b another clamping area of a fixed platen,
Fig. 6a-b an exemplary interconnection of sensor elements and
7 shows a further exemplary embodiment of a locking unit according to the invention.
1 shows a clamping unit 1 according to the invention for a molding machine. This clamping unit 1 comprises a fixed platen 2 with a first clamping area 16 for clamping the at least one first mold part 5 and a movable platen 3 with a second clamping area for clamping the at least one second
mold part 6.
About the closing unit 1 and the fixed platen 2 and the movable platen 3, a clamping force 4 on the mold, which in this embodiment by the first mold part 5 and the second
Mold part 6 is formed, are exercised.
The closing force 4 is indicated by arrows in FIG. 1, but the closing force 4 is to be understood as the sum of these individual forces. These forces can in different ways on the fixed platen 2 and / or
movable platen 3 are exercised. For example
Design options are conceivable, with bars 15 and/or a toggle lever mechanism applying a clamping force 4 to the movable mold clamping platen 3
and/or the fixed platen 2 is exercised.
A surface sensor 7 is provided in the clamping area 16 between the fixed platen 2 and the first mold part 5 . In this exemplary embodiment, a further area sensor 7 is also provided between the movable mold clamping plate 3 and the second mold part 6 . However, embodiment variants are also quite conceivable in which only one such area sensor 7 is provided (either on the fixed mold clamping plate 2 or the movable mold clamping plate 3). Particularly in the case of molds which have a symmetrical configuration of the mold cavity, a sufficiently precise/resolved evaluation is already possible using a surface sensor 7
the power distribution 8 possible.
Via the surface sensors 7 designed as foils in this exemplary embodiment
a force distribution 8 can be determined.
The ideal force distribution 8 with a uniform load shown in FIG. 1 is of course only to be understood as an exemplary visualization of the principle. In an actual measurement, a uniform (perpendicular) force distribution 8 would not be expected. In reality, there can rather be curves (more precisely, surfaces of a higher order when viewed spatially) with maxima and discontinuous areas
result.
Designed as films surface sensors 7 of this embodiment can be glued to the fixed platen 2 and / or the movable platen 3 or only by the clamping force
Mold parts 5, 6 are held on the mold mounting plates 2, 3. In this exemplary embodiment, the area sensors 7 are selected to be larger than the
actual contact area between the mold parts 5, 6 and the
Mold mounting plates 2, 3. However, versions are also quite conceivable at
where at least one surface sensor 7 is arranged only on partial areas of the contact surface. Such sub-areas can be, for example, areas in which
an increase in power is to be expected.
2 shows a view of the clamping area 16 of a fixed mold clamping platen 2. In this exemplary embodiment, there are four bars for applying a clamping force
15 are provided, which pass through the fixed platen 2 .
The following layer structure can be provided for the area sensor 7:
- A first layer formed by a mold mounting plate 2.3 or a polyethylene terephthalate substrate (PET) applied to a mold mounting plate 2.3
- a (lower) electrode or electrodes in a second layer formed of a conductive polymer material;
- A piezoelectric and pyroelectric sensor material, which consists for example of polyvinylidene difluoride (PVDF) and trifluoroethylene (TrFE) and
- a (upper) electrode or electrodes made either of carbon or of
conductive polymer.
The electrodes have grid-like connections with one another, so that individual sensor elements 9 are realized in this exemplary embodiment, the
individual sensor elements 9 are interconnected by connections 10.
This results in the significant advantage that due to the intelligent design of the sensor connections, even if a sensor element 9 fails or individual conductor tracks are severed, the area sensor 7 can continue to deliver informative measurement results, in that the remaining sensor elements 9 can continue to communicate with each other via the connections 10 (see Fig. 6 ).
The measurement signal of the surface sensor 7 can be transmitted via a signal-conducting connection to an evaluation device 11, in which the electrical signal of the surface sensor 7, for example, in a different physical variable, such as a
Closing force distribution - i.e. pressure distribution - can be converted and
if necessary for the production cycle for monitoring or regulation
other process parameters can be used.
The functions of the evaluation device 11 can, for example, by the central control or regulation unit (machine control) of a molding machine or the closing unit 1 or by a separate
Evaluation device 11 are taken over.
Furthermore, it can be seen in FIG. 2 that a first mold part 5 is connected to the fixed mold clamping plate 2 via clamping devices 12 , with the area sensor 7 being arranged between the first mold part 5 and mold clamping plate 2 . In this exemplary embodiment, the clamping device 12 is designed as a quick-action clamping device for the first mold part 5 on the mold clamping plate 2, with the surface sensor 7 correspondingly
is adjusted.
The first mold part 5 can be supplied via an injection nozzle 14, a thermoplastic material, the injection nozzle 14 on the first mold part 5 through a nozzle opening 13 in the fixed
Mold platen 2 attacks.
Since the embodiment of FIG. 2 is an injection molding machine, an injection nozzle 14 is provided for a thermoplastic material. Of course, this specific embodiment is general to molding machines
to kill
Fig. 2 shows an example of a sensor arrangement for a fixed platen 2, since recesses in the area of the central opening through which the nozzle
Coming into the mold and the plasticized plastic is injected into the mold. 3a shows an example of a visualization of a force distribution 8 below
Closing force application to a movable platen 3. This
Force distribution 8 can, for example, on experimental setups or
Test machines are determined in order to still during the development phase - if necessary - by geometric configurations of the mold mounting plates
Being able to influence this force distribution 8 .
Such a geometric configuration can be, for example, a crowning 18 of the movable platen 3 (as shown in FIG. 3b). As can be clearly seen, the force distribution 8 can be made much more constant (more even) over the entire surface by a cambering 18 of the movable platen 3 . This crowning can be achieved by geometric design, e.g. editing the shape of the mold mounting plate, or by active change (otherwise, for example, flat mold mounting plate) via additional systems, such as active elements or hydraulics within the
Mold platen to be changed.
In FIG. 3c, the force distributions 8 from FIGS. 3a and 3b are shown one above the other on the movable platen 3, with the effect of the crowning 18 on the force distribution 8 being shown more clearly. The dotted line shows the force distribution 8 on a movable mold platen 3 without a crown 18 and the solid line shows a force distribution 8 on a movable mold platen 3 with a crown 18 . The dimensioning of the closing unit 1 and the vectorial magnitudes of the acting closing forces are natural—in order to compare the configurations
to be able to — same size.
Fig. 4 shows essentially the same embodiment as already explained with reference to FIG. 1, but now in FIG , On the mold parts 5, 6 to open the same
is exercised. The tearing force 17 is in turn to be understood as the sum of these individual forces
and can be attached to the fixed platen 2 in different ways
and/or the movable platen 3 can be exercised. So are
For example, design options are conceivable in which a tearing force 17 acts on the movable mold mounting plate via bars 15, hydraulic cylinders attached to the mold mounting plates 2, 3, mechanical drives (such as a spindle drive) and/or a toggle lever mechanism
3 and/or the fixed platen 2 is exercised.
The tearing force 17 can in turn be determined as a force distribution 8 via the area sensors 7, with an area sensor 7 being arranged between the movable mold clamping plate 3 and the second mold part 6 and another area sensor between the fixed mold clamping plate 2 and the first
Mold part 5 is arranged.
5 shows a further clamping area of a fixed mold clamping plate 2 , a first mold part 5 being connected to the fixed mold clamping plate 2 via clamping devices 12 . Fig. 5a shows a front view of the
Embodiment and Fig. 5b is a side view.
The clamping devices 12 shown in FIGS. 5a, b are formed by retaining claws 19 which engage a collar of the first mold part 5 and thus hold the mold part 5 on the fixed mold clamping plate 2, more precisely
said clamp them together.
Area sensors 7 are provided in the contact area of the holding claws 19 on the collar of the first mold part 5 . These area sensors 7 can either be glued to the first mold part 5 or to the holding claws 19 . Alternatively, it can also be provided that the area sensors 7 are only inserted between the holding claws 19 and the first mold part and then
be braced together.
This arrangement of surface sensors 7 between the holding claws 19 and the mold part 5 can specifically monitor the clamping parameters of a mold and, for example, detect a loosening of the mold
will. However, also force curves during a process
Shaping machine (preferably a buoyancy force) is through such
Arrangement particularly favorable measurable.
6 shows an exemplary interconnection of sensor elements 9 with one another. In this special exemplary embodiment, the sensor elements 9 are connected in parallel to one another by the electrical connections 10 . The entirety of the individual sensor elements 9 thereby forms the area sensor 7, which with the
Evaluation device 11 is connected.
This interconnection has the special advantage that even if a sensor element 9 fails or individual conductor tracks are severed, the area sensor 7 can continue to deliver informative measurement results, in that the remaining sensor elements 9 continue to communicate with one another via the connections 10
be able.
For example, an undamaged version is shown in FIG. 6a and a damaged area sensor 7 in FIG. 6b, in which individual conductor tracks (indicated by the dashed line) were damaged/cut through. It is easy to see how this damage to the conductor tracks only affects the right-hand sensor elements 9 (arranged by the dashed line), which are separated from the remaining and functioning left-hand part of the area sensor
became.
Fig. 7 shows a further exemplary embodiment of a clamping unit 1 according to the invention, which, analogously to the embodiments in Figures 1 and 4, has a fixed mold clamping plate 2 and a movable mold clamping plate 3 with a first clamping area 16, a second clamping area, a first mold part 5 and
second mold part 6 has.
In addition, the closing unit 1 shown in FIG. 7 is designed with a center plate 20 . This allows two molds to be operated simultaneously. The center plate 20 can also be moved relative to the fixed platen 2
stored.
A third mold part 21 is arranged on the center plate 20 in a third clamping area of the center plate 20 opposite a first mold part 5 mounted on the fixed mold clamping plate 2, and a fourth mold part 22 is arranged in a fourth clamping area of the center plate 20 opposite a second mold part 22 mounted on the movable mold clamping plate 3
Mold part 6 arranged.
In turn, area sensors 7 are provided in the clamping areas of the center plate 20, which are designed to measure a force distribution 8 in the first clamping area of the center plate 20 and/or in the second clamping area of the center plate 20, with the area sensors between the center plate
20 and mold part 5, 6 are arranged.
Furthermore, also on the fixed platen 2 and the movable
Mold mounting plate 3 surface sensors 7 provided in the mounting areas.
The measurement signals from the surface sensors can in turn be transmitted via a signal-conducting connection to an evaluation device 11, in which the electrical signal from the surface sensor 7 can be converted, for example, into another physical variable, such as a clamping force distribution - i.e. pressure distribution - and, if necessary, for the production cycle for monitoring or
can be used to control other process parameters. The middle plate 20 of this embodiment can in the sense of the present
Document as a movable platen according to the invention
be considered.
Reference list:
1 locking unit
2 fixed platen
3 moveable platen 4 clamping force
5 first mold part
6 second mold part
7 area sensor
8 power distribution
9 sensor element
10 connection
11 Evaluation device 12 Clamping device 13 Nozzle opening 14 Injection nozzle
15 spar
16 clamping area
17 tear strength
18 crowning
19 retaining claw
20 center plate
21 third mold part
22 fourth mold part
Innsbruck, May 20, 2020

权利要求:
Claims (1)
[1]
Patent Claims:
Comprising a clamping unit (1) for a molding machine
- a fixed mold mounting plate (2) with a first clamping area (16) for clamping at least one first mold part (5) and
- a movable platen (3) with a second clamping area for clamping at least one second mold part (6),
characterized in that at least one on the fixed platen
(2) and/or arranged on the movable platen (3).
Area sensor (7) is provided, which is designed to a
Force distribution (8) in the first clamping area (16) and/or in the second
to measure the clamping area.
Locking unit according to Claim 1, characterized in that the at least one surface sensor (7) is designed as a pressure-sensitive sensor and preferably a piezoelectrically and/or pyroelectrically activated and/or
has activatable layer.
Closing unit according to at least one of the preceding claims, characterized in that the at least one surface sensor (7) has at least one conductor track and/or electrode which is mounted on the fixed mold mounting plate (2) and/or the movable mold mounting plate (3).
is arranged.
Closing unit according to at least one of the preceding claims, characterized in that the at least one surface sensor (7) is a suspension of a piezoelectrically and pyroelectrically activatable flat oxide
having.
Closing unit according to at least one of the preceding claims, characterized in that the at least one surface sensor (7) has a film, the at least one surface sensor (7) on the fixed mold mounting platen (2) and/or the movable mold mounting platen (3)
attached, especially glued, is.
6. Closing unit according to at least one of the preceding claims, characterized in that the at least one surface sensor (7) by a printing process - preferably screen printing - on the fixed platen
(2) and/or the movable platen (3) is applied.
7. Closing unit according to at least one of the preceding claims, characterized in that the at least one surface sensor (7) on a clamping device (12) — preferably a holding claw (19) — for clamping a mold part (5, 6) on the fixed mold clamping plate
(2) and/or the movable platen (3) is arranged.
8. Closing unit according to at least one of the preceding claims, characterized in that the at least one surface sensor (7) is located at least partially on a surface of the fixed mold clamping plate (2) and/or the
movable platen (3) is arranged.
9. Shaping machine, preferably injection molding machine, with a
Locking unit (1) according to at least one of the preceding claims.
10. Method for measuring a force distribution (8) in a first clamping region (16) of a fixed mold clamping plate (2) for clamping a first mold part (5) and/or in a second clamping region (16) of a movable mold clamping plate (3) for clamping a second mold part (6) in a clamping unit (1) for a molding machine, the force distribution (8) in the first clamping area (16) and/or in the second clamping area by means of at least one on the fixed mold clamping plate (2) and/or the movable mold clamping plate ( 3)
arranged surface sensor (7) is measured.
11. The method according to the preceding claim, characterized in that the detected force distribution (8) for determining a deformation of the fixed platen (2) and / or the movable platen (3) under
Closing force (4) is used.
12. The method according to the preceding claim, characterized in that on the basis of the detected deformation, a geometry of the fixed platen (2) and/or the movable platen (3) and/or the first mold part (5) and/or the second
Mold part (6) is adjusted.
13. The method according to at least one of claims 10 to 12, characterized in that the detected force distribution (8) used to determine or monitor a clamping force of a mold part (5, 6).
will.
14. The method according to any one of claims 10 to 13, characterized in that the detected force distribution (8) for determining, monitoring and / or controlling a process parameter - preferably a tearing force and / or a closing force (4) - during operation of the closing unit ( 1)
is used.
Innsbruck, May 20, 2020

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同族专利:

公开号 | 公开日

CN113696437A|2021-11-26|

DE102021112673A1|2021-11-25|

AT523853B1|2022-01-15|

引用文献:

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

EP1190833A1|2000-09-25|2002-03-27|Siemens Aktiengesellschaft|Surface pressure generating device in an injection moulding machine|

DE102004035386B3|2004-07-21|2005-09-08|Fachhochschule Kiel|Application of piezoelectric or pyroelectric thin-film layer on substrate incorporating pyroelectric ceramic powder|

EP2431404A1|2010-08-27|2012-03-21|Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.|Solution or suspension containing fluoropolymer, method for producing same and use of same in the production of piezoelectric and pyroelectric coatings|

WO2014037016A1|2012-09-04|2014-03-13|Joanneum Research Forschungsgesellschaft Mbh|Printed piezoelectric pressure sensing foil|

法律状态:

优先权:

申请号 | 申请日 | 专利标题

ATA50450/2020A|AT523853B1|2020-05-20|2020-05-20|Clamping unit, forming machine and method of measuring a force distribution|ATA50450/2020A| AT523853B1|2020-05-20|2020-05-20|Clamping unit, forming machine and method of measuring a force distribution|

DE102021112673.8A| DE102021112673A1|2020-05-20|2021-05-17|Clamping unit, forming machine and method for measuring a force distribution|

CN202110549196.XA| CN113696437A|2020-05-20|2021-05-20|Mold clamping unit, molding machine and method for measuring force distribution|

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