• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Ultrasonic welding device; comprising a sonotrode (1) fixed to an amplifier (12) and this to a converter (13), to which the head (2) is fixed; characterized in that it comprises: an outer jacket (3) arranged around the sonotrode (1), an annular chamber (4) for circulating pressurized air being delimited therebetween, having at its front end (31) a crenellated mouth, for the pressure air outlet and sonotrode cooling (1); said outer jacket (3) has a rear portion (32) on the head (2) with the possibility of axial displacement, forming a gripper that exerts, by the action of a compressible means (51), a pressure against the pieces (p1, p2) to be welded, in a perimeter zone close to the weld, before the tip (11) of the sonotrode (1) makes contact with said pieces to be welded. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2649741A1
    申请号:ES201630962
    申请日:2016-07-14
    公开日:2018-01-15
    发明作者:Carles VILA NORIA
    申请人:Carles VILA NORIA；
    IPC主号:
    专利说明:

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    DESCRIPTION
    Ultrasonic welding device.
    Object of the invention.
    The object of the present invention is an ultrasonic welding device, in particular for welding parts of plastic material. The device comprises a sonotrode, an amplifier and a converter, suitable for coupling to a robotic manipulator, actuator or arm responsible for moving it during its approach to the area to be welded and the welding, and to which a head is fixed treadmill and cooling.
    A main aspect of the invention is to provide the device with suitable means to exert a frontal pressure on the pieces to be welded in a peripheral area and very close to the welding to be performed, so that there is no unwanted separation between said parts; and to perform an effective cooling of the sonotrode and the welding itself once formed.
    Field of application of the invention.
    This invention is applicable in the welding of plastic materials by ultrasound.
    State of the art
    In various sectors, such as the automotive industry, welding of plastic parts by means of ultrasound is common; presenting one of the pieces to join holes for passage of tubular turrets defined in the second piece to join. Before welding the areas to be welded of both parts are superimposed. During welding a sonotrode acts in axial direction against the tubular turret of plastic material causing the melting of the plastic and its crushing, forming on the first piece a head or thickening of material that prevents the release of both pieces.
    For the realization of multiple welds simultaneously, machines equipped with cassettes with several spot welding sonotrodes are used, providing a repetitive configuration.
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    The change of the parts to be welded requires a change of the model and the reconfiguration of the machine for each model.
    Also more flexible ultrasonic welding devices are known, with robotic arm, which allow to change the model by changing only coordinates.
    During the use of these welding devices, two problems usually arise:
    • a first problem related to the proper cooling of the sonotrode and the same welding for its efficiency and;
    • a second problem related to the correct positioning of the pieces to be joined, so that there is no unwanted separation between them.
    In relation to the first sonotrode cooling problem there are several antecedents:
    A method for maintaining a vibrating tool at a controlled temperature is described in US3438428. For one embodiment, said vibrating tool is applied to the welding of plastics by means of a sonotrode. For the purpose of carrying out the aforementioned temperature control, a conduit to which the inlet and outlet of the external circulation circuit of a cooling fluid are connected is defined in said sonotrode.
    US6691909 refers to an apparatus and a method for ultrasonic welding workpieces that reduces sonotrode adhesion during the ultrasonic welding process. This document US6691909 also proposes internal cooling systems for the sonotrode similar to those proposed in US3438428.
    EP1000732 describes an apparatus for ultrasonic welding of resin fixing elements, and proposes the formation of a defined air passage through a portion of the sonotrode, one of whose uses is to inject air in order to cool the welded area
    This background has some drawbacks: the projection of air through an internal duct of the sonotrode can cause the appearance of bubbles or filaments in the material
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    cast and consequently defective welds; In addition, this projection is not particularly effective since, when the advance of the sonotrode on the molten material takes place, said internal duct is plugged by the molten plastic itself, preventing the circulation of air through the interior of the sonotrode and its exit through the previous tip or end and increasing excessively the temperature of the sonotrode.
    In relation to the second problem of positioning the parts to be welded, the use of external manipulators, other than the welding device, which hold the parts in a zone more or less distant from the welding zone is known.
    This determines frequently, and especially in those cases where there is a material (for example linings) between the pieces to be welded, that both pieces are not properly pressed into the welding zone, so that both pieces do not stay together but there is between them an unwanted slot or separation and in some cases unacceptable by the manufacturer.
    The applicant is unaware of the existence of antecedents concerning ultrasonic welding devices that allow the two exposed problems to be satisfactorily and simultaneously solved, both in terms of sonotrode cooling and the correct positioning of the parts in the welding areas. to prevent a groove or separation between them.
    Description of the invention
    The ultrasonic welding device object of the invention; comprising a sonotrode, an ultrasonic amplifier, a converter, suitable for coupling to a manipulator or robotic arm, and to which a cooling trampler head is attached, it has adequate characteristics to solve the exposed problem and specifically to exert a frontal pressure on the pieces to be welded in a peripheral area and very close to the welding to be performed, so that there is no unwanted separation between said parts; and to perform an effective cooling of the sonotrode, due to its external surface, guaranteed the circulation of pressurized air towards the welding zone during the execution of said welding.
    To this end, and according to the invention, this device comprises an outer jacket arranged around the sonotrode and which delimits together with said sonotrode a
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    annular section chamber for the circulation of pressurized air connected, through an inner cavity of the head, to a pressurized air inlet and which has a crenellated annular anterior mouth, for the output of pressurized air and perimeter cooling of the sonotrode.
    Said outer jacket has a rear portion mounted on the head with the possibility of axial displacement, between: - an anterior position in which the front end of the jacket protrudes frontally with respect to the tip of the sonotrode; forming a treadmill that exerts, by the action of compressible means, a configurable pressure against the pieces to be welded, in a perimeter zone close to that of welding, during the approach of the sonotrode to the parts to be welded and before the tip of the sonotrode establishes contact with said parts to be welded, and - a rear position, determined by the advance of the sonotrode during welding while the front end of the jacket holds the parts to be welded, and in whose rear position the front end of the jacket it is arranged coplanarly, or in a very close plane, at the tip of the sonotrode.
    With these characteristics, it is achieved that the front end of the jacket exerts a configurable pressure on the pieces to be welded, in a perimeter zone near the welding zone, before the welding starts and during the entire welding process, with what is guaranteed the correct positioning of these pieces, avoiding the remaining unwanted slots or spaces between them.
    It is also achieved with the invention that the pressurized air used for the external cooling of the sonotrode circulates through the annular chamber and exits through the front mouth of the jacket, even during welding, since the crenellated configuration of the anterior mouth of The jacket prevents molten plastic from blocking the outlet of pressurized air, contrary to what happens in the aforementioned background provided with a central outlet defined in the sonotrode itself
    The pressurized cooling air provides an additional beneficial effect on the performance in the operations of this type of welding because, when the sonotrode is removed after welding, that pressurized air cools the molten plastic at the welding point, causing the material molten solidifies, with the consequence that the sonotrode separates without dragging molten material and, therefore, without deforming and / or weakening the weld, which avoids having to devote the time that is currently customary to wait for the molten plastic solidifies -without refrigeration- to be able to remove the sonotrode without the annoying deformations of
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    the welder. The result of this effect is that the welds are performed at shorter intervals of time; that is, with higher performance per unit of time.
    Also, the pressure exerted on the parts remains effective in the recoil of the sonotrode, preventing their separation while cooling the weld with the pressurized air.
    An additional advantage of the circulation of the pressurized air, of cooling through the inner cavity of the device, is that the air pressure itself causes a self-centering in the radial direction of the jacket with respect to the mechanical guiding element, thus minimizing wear by mechanical friction between both, since it only acts in case of extreme radial forces.
    Description of the figures.
    To complement the description that is being made and in order to facilitate the understanding of the characteristics of the invention, a set of drawings is attached to the present specification in which, for illustrative and non-limiting purposes, the following has been represented:
    - Figure 1 shows an elevation view of an exemplary embodiment of the ultrasonic welding device according to the invention, in an inoperative position and in which the jacket can be seen in the previous position.
    - Figure 2 shows the tread and cooling head in a view similar to the previous one in which the ultrasonic welding elements have been removed.
    - Figure 3 shows an elevation view of the ultrasonic welding device of Figure 1 in an operative position, with the jacket in the rear position.
    - Figures 4 and 5 show two details of a previous portion of the device of the invention in different phases of the welding of two pieces of plastic material.
    Preferred embodiment of the invention.
    As can be seen in the example of embodiment shown in Figures 1 and 3 the
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    ultrasonic welding device, comprises a sonotrode (1) fixed by its area after an amplifier (12) and this in turn to a converter (13) suitable for coupling to an actuator, manipulator or robotic arm responsible for its displacement , and to which the head (2) is fixed.
    The device comprises an outer jacket (3) arranged around the sonotrode (1) and which together with said sonotrode delimits an annular chamber (4) for circulation of pressurized air connected through the cavity (23) to an inlet (21). ) of pressure air defined in the head (2); said outer jacket (3) disposing at its front end (31) of a crenellated mouth, for the exit of pressurized air from the periphery of the tip (11) of the sonotrode (1) and the perimeter cooling of said sonotrode (1) .
    The outer jacket (3) has a rear portion (32) mounted on the head (2) with the possibility of axial displacement, between an anterior position represented in Figure 1, and a posterior position represented in Figure 3.
    In the anterior position the anterior end (31) of the shirt (3), protrudes frontally with respect to the tip (11) of the sonotrode (1), while in the posterior position the anterior end (31) of the shirt is coplanarly disposed or in a plane close to the tip (11) of the sonotrode (1).
    The device comprises a support (5) externally fixed to an intermediate area of the jacket (3) and which moves together with said jacket (3) with respect to the head (2), between the anterior and posterior positions, mentioned above.
    The device comprises compressible means (51) represented in this example by helical springs that act on the support (5) and tend to keep it in the previous position, in contact with a stop (22) fixed to the head (2) and which it limits the advance of the support (5) in the previous position, as shown in figure 1.
    The rear portion (32) of outer jacket (3) is housed in a cavity (23) of the head (2) that communicates through a perforated cylindrical bushing (6) with the lateral inlet (21) of defined pressure air in said head (2); said rear portion (32) of the jacket comprising a crenellated rear end (33) and radial holes (34) for the passage of pressurized air from the cavity (23) of the head (2) to the annular chamber (4) defined between the outer jacket (3) and the sonotrode (1), regardless of the position more or less
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    advanced of said outer jacket (3).
    The perforated cylindrical bushing (6) is housed in a perimeter seat (24) defined in the cavity (23) of the head (2) and fixed in said perimeter seat (24) by means of a retainer (7) fixed to the head ( 2) and which has a seal (71) that acts against the movable support (5) preventing the leakage of pressurized air to the outside through the space between the support (5) and the head (2).
    Figures 4 and 5 represent two positions of the device during its operation in axial direction and the welding of two pieces of plastic (P1, P2) conveniently superimposed and provided respectively with a turret (T) and a hole (O) for the turret step (T).
    As can be seen in figure 4, during the approach of the sonotrode (1) to the parts (P1, P2) to be welded, before the tip (11) of the sonotrode (1) makes contact with said parts to be welded, the jacket (3) is in an outstanding anterior position and its anterior end (31) forms a treadmill that exerts, by the action of compressible means (51), a configurable pressure against the pieces (P1, P2) to be welded, in a perimeter zone close to that of welding, immobilizing them in the appropriate position and preventing a gap or slot between them.
    As seen in Figure 5, during the advance of the device in the axial direction the sonotrode acts with the tip (11) on the turret (T) by welding; and the front end (31) of the jacket keeps the pieces (P1, P2) to be welded pressed, reaching a rear position, determined precisely by the mentioned advance of the sonotrode (1).
    During welding the jacket (3) recedes with respect to the sonotrode (1) resulting in a compression of the compressible means (51) that tend to keep it in the previous position.
    Once the nature of the invention has been sufficiently described, as well as a preferred embodiment, it is stated for the appropriate purposes that the materials, shape, size and arrangement of the described elements may be modified, provided that this does not imply an alteration. of the essential features of the invention that are claimed below.
    权利要求:
    Claims (4)
    [1]
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    1- Ultrasonic welding device; comprising a sonotrode (1)
    fixed by its rear area to an amplifier (12) and this in turn to a converter (13) suitable for coupling to an actuator, manipulator or robotic arm in charge of its displacement, and to which the head (2) is fixed ; characterized in that it comprises: an outer jacket (3) arranged around the sonotrode (1) and that together with said sonotrode (1) delimits an annular chamber (4) for the circulation of pressurized air connected through the cavity (23) to an inlet (21) of pressurized air and having at its front
    (31) of a crenellated mouth, for the outlet of pressurized air and the perimeter cooling of the sonotrode (1); said outer jacket (3) has a rear portion (32) mounted on the head (2) with the possibility of axial displacement, between: - an anterior position in which the front end (31) of the outer jacket (3) protrudes frontally with respect to the tip (11) of the sonotrode (1); forming a treadmill that exerts, by the action of compressible means (51), a configurable pressure against the pieces (P1, P2) to be welded, in a perimeter zone close to that of welding, during the approach of the sonotrode (1) to the parts to be welded and before the tip (11) of the sonotrode (1) makes contact with said parts to be welded, and - a rear position, determined by the advance of the sonotrode (1) during welding while the front end ( 31) of the outer jacket (3) keeps pressing the pieces (P1, P2) to be welded, and in whose rear position the front end (31) of the outer jacket (3) is arranged coplanarly, or in a very close plane, to the tip (11) of the sonotrode (1).
    [2]
    2. - Device according to claim 1, characterized in that the posterior portion
    (32) of the outer jacket (3) is housed in a cavity (23) of the head (2) that communicates through a perforated cylindrical bushing (6) with a lateral inlet (21) of pressurized air, defined in said head (2); said rear portion (32) of the outer jacket (3) comprising a crenellated rear end (33) and radial holes (34) for the passage of pressurized air from the cavity (23) of the head (2) to the annular chamber (4) defined between the outer jacket (3) and the sonotrode (1).
    [3]
    3. - Device according to claim 2, characterized in that the perforated cylindrical bushing (6) is housed in a perimeter seat (24) defined in the cavity (23) of the head (2) and fixed in said seat by means of a retainer (7).
    [4]
    4. - Device according to claim 3, characterized in that the retainer (7)
    It has a seal (71) that acts against the movable support (5), preventing the leakage of pressurized air to the outside through the space between the support (5) and the head (2).
    5. Device according to claim 1, characterized in that it comprises: a
    support (5) externally fixed to an intermediate area of the outer jacket (3) and which moves together with said outer jacket (3), between the anterior and posterior positions; compressible means (51) that act on the head (2) and tend to keep it in the previous position; and a stop (22) that delimits the advance of the support (5) in the previous position.
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    法律状态:
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    优先权:
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    ES201630962A|ES2649741B1|2016-07-14|2016-07-14|ULTRASOUND WELDING DEVICE|ES201630962A| ES2649741B1|2016-07-14|2016-07-14|ULTRASOUND WELDING DEVICE|
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