• 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:
    Stereolithography Machine and Method The invention is a stereolithography machine (1) comprising the following: a container (3) suitable for containing a fluid substance and comprising a transparent bottom (3a); a support plate (2) provided with a hole (2a) designed to house the container (3) so that the transparent bottom (3a) faces the hole (2a); a radiation source (4) disposed below the support plate (2) and suitable for carrying a radiation beam towards the transparent bottom (3a) through the hole (2a); a temperature control unit (5) suitable for keeping the bearing plate (2) at a predetermined temperature.
    公开号:BR112012002222B1
    申请号:R112012002222-9
    申请日:2010-08-03
    公开日:2019-07-09
    发明作者:Sergio Zenere
    申请人:Dws S.R.L.；
    IPC主号:
    专利说明:

    STEREOLITOGRAPHY MACHINE AND METHOD
    The present invention relates to a stereolithography machine particularly suitable for the rapid prototyping of three-dimensional objects.
    A stereolithography machine of the known type comprises a transparent container supported on a plate provided with a central opening, on the underside of which there is a light emitter.
    The container contains a plastic resin that polymerizes and therefore solidifies if exposed to the radiation emitted by said emitter, which is preferably a laser emitter.
    At the top of the container, there is a support element in which the three-dimensional object remains anchored during its formation.
    As is known, the process of manufacturing three-dimensional objects occurs by selectively solidifying a thin layer of resin adjacent to the bottom of the container, through the action of the laser beam that reaches said layer of resin through the hole present in the plate and the transparent background.
    The support element is successively raised to release the solidified layer from the bottom of the container, to allow another liquid resin to flow towards the bottom of the container.
    The operations mentioned above are repeated for a plurality of 20 successive layers, until the production of the three-dimensional object is completed.
    The applicant for the present patent application has revealed that known machines of the type described above have the disadvantage that they are not adapted to the use of so-called “hybrid” resins, which contain various components of different types such as, for example, a mixed plastic component 25 with ceramics, wax or other non-plastic component.
    Therefore, there is the drawback that the use of the hybrid resins mentioned above in machines of the known type negatively affects the quality of the objects obtained and increases the number of production wastes.
    The present invention aims to overcome the disadvantage of the known technique 30 as outlined above.
    In particular, it is the aim of the present invention to provide a stereolithography machine that comprises a radiation emitter disposed on the underside of the container and makes it possible to obtain optimum solidification results for any type of resin, including so-called hybrid resins.
    This objective was achieved by a stereolithography machine built in accordance with the main claim.
    2/5
    After some practical tests, the depositor of the present invention revealed that, in the so-called hybrid resins, during the use of the known stereolithography machine of the type described above, the different components separated and formed agglomerates in the resin matrix, making it inhomogeneous and avoiding its correct solidification.
    The depositor revealed that maintaining the resin at a suitable predetermined temperature is possible to avoid the separation of the resin, while maintaining it homogeneous and obtaining its optimum solidification.
    To maintain said predetermined temperature, the stereolithography machine which is the object of the invention comprises a device suitable for controlling the temperature of the plate supporting the resin container.
    Advantageously, maintaining the plate at a predetermined temperature also means maintaining the container and, therefore, the resin contained therein at said predetermined temperature by conduction of heat.
    Additional details of the stereolithography machine that is the subject of the invention are described in the dependent claims.
    Said objective and advantage, together with others that are highlighted below, will be illustrated in detail in the description of a preferred embodiment of the invention which is provided by means of a non-limiting example with reference to the attached figures, in which:
    Figure 1: shows an axonometric perspective of the stereolithography machine that is the object of the invention;
    Figure 2: shows an axonometric perspective of the Figure machine from a different angle;
    Figure 3: shows a front view of a partial section of the machine shown in Figure 1;
    Figure 4: shows a partially enlarged detail of the machine shown in Figure 3.
    The stereolithography machine of the invention, indicated as a whole by 1 in Figure 1, comprises a backing plate 2 associated with a container 3 suitable for containing a fluid substance, particularly a liquid resin 9, and provided with a transparent background 3a.
    In addition, as shown in Figure 2, there is a radiation source 4 disposed below the backing plate 2, the radiation of which is suitable for solidifying resin 9 or other equivalent fluid substance.
    3/5
    The radiation source 4 carries a beam of radiation towards the container 3 through a hole 2a provided in the backing plate 2, thus causing the resin layer 9 adjacent to the bottom of the container to solidify.
    3.
    The radiation source 4 preferably, but not necessarily, emits a laser beam 4a and is associated with an operating unit 11 suitable for changing the point of incidence of the laser beam 4a in the container 3 with respect to two mutually orthogonal axes.
    It is evident, on the other hand, that in construction variants of the invention, the radiation source 4 can be of any other known type, for example, a mirroring matrix for projecting a two-dimensional image of the container 3.
    The three-dimensional object 10 being formed is supported by a support element 12 associated with the moving means 13 to move the support element 12 in the vertical direction.
    The components described above are supported by a frame supported on the ground, not illustrated in the figures as it is known by itself.
    According to the invention, the stereolithography machine 1 comprises a temperature control unit 5, visible in Figure 2, suitable for maintaining the backing plate 2 at a predetermined temperature.
    The heat conduction allows the backing plate 2 to also hold the container 3 and therefore the resin 9 there at the same predetermined temperature.
    The temperature mentioned above can be chosen in such a way as to avoid the separation of the different components of the resin 9.
    The control unit 5 is preferably configured so that it is able to maintain the plate 2 at any chosen temperature within a predefined range, so that it is possible to adjust the conditions that are most suitable for the different types of resin.
    The invention thus achieves the objective of providing a stereolithography machine 1 that allows the use of any type of resin 9, without affecting the solidification process.
    The temperature control unit 5 preferably comprises a pair of heating elements 6, thermally coupled to said support plate 2 in positions opposite to the orifice 2a.
    Advantageously, the two heating elements 6 ensure an even distribution of heat throughout the plate 2 and therefore throughout the container 3.
    4/5
    It is, therefore, evident that in the construction variants of the invention the number of heating elements 6 can also be only one or more than two, depending on the needs of the manufacturer.
    The temperature control unit 5 preferably also comprises a temperature sensor 7, thermally coupled to the plate 2.
    The temperature sensor 7 mentioned above and the heating elements 6 are operatively connected to a control unit, not shown here but known per se, suitable for keeping the plate 2 at a constant temperature.
    The temperature sensor 7 is preferably arranged in an intermediate position between the two heating elements 6, to measure the average temperature of the plate 2, thus increasing the adjustment accuracy.
    The heating elements 6 are preferably, but not necessarily, electrical resistors 6a and are placed in contact with the plate 2, to obtain an optimal heat exchange, as shown in Figure 3.
    Said contact can preferably be made more effective by using a conductive paste which, advantageously, makes it possible to compensate for any contact imperfections between the heating element 6 and the plate 2.
    The heating element 6 is preferably housed in a recess 14 belonging to the plate 2, shown in the open condition in the detail of Figure 4.
    The recess 14 mentioned above is preferably provided with a cover 8, removably associated with the plate 2 to allow easy assembly and / or replacement of the heating element 6.
    The material used for the backing plate 2 is preferably aluminum or other material with similar mechanical strength and heat conductivity.
    Operatively, the container 3 is filled with liquid resin 9, after which the three-dimensional object 10 is produced with the known method, according to the description given above.
    However, unlike what happens in machines of the known type according to the invention, during the formation of object 10, the temperature control unit 5 maintains the temperature of the plate 2 at a predetermined value.
    5/5
    The aforementioned predetermined temperature is selected according to the type of resin 9 used, to maintain the necessary homogeneity to guarantee its solidification.
    The above clearly shows that the stereolithography machine described 5 above achieves the stated objective.
    In particular, the temperature control device allows the resin to be kept in optimal conditions, avoiding the separation of its components and, thus, guaranteeing a correct solidification process.
    During construction, the machine that is the object of the invention can undergo 10 changes that, although not illustrated in the figures or described here, must nevertheless be covered by the present patent application, since they come within the scope of the claims that follow.
    Where the technical characteristics mentioned in any claim are followed by reference signs, these reference signs have been included for the sole purpose of increasing the intelligibility of the claims and, accordingly, such reference signs have no limiting effect on the protection of each element identified by way of example by such reference signs.
    权利要求:
    Claims (13)
    [1]
    1. Stereolithography machine (1) comprising:
    a container (3) suitable for containing a fluid substance and provided with a transparent bottom (3a);
    a support plate (2) provided with an orifice (2a), said plate (2) being designed to house said container (3) so that said transparent bottom (3a) faces the said hole (2a);
    a radiation source (4) arranged below said support plate (2), suitable for carrying a beam of radiation towards said transparent bottom (3a) through said hole (2a), a temperature control unit (5 ) suitable for maintaining said support plate (2) at a predetermined temperature;
    characterized by the fact that said temperature control unit (5) comprises at least one heating element (6) thermally coupled to said support plate (2), and the heat conduction allows said support plate (2 ) heat said container (3).
    [2]
    2. Stereolithography machine (1), according to claim 1, characterized by the fact that the heat conduction allows said support plate (2) to also keep said container (3) at the same predetermined temperature.
    [3]
    Stereolithography machine (1) according to either of claims 1 or 2, characterized in that said temperature control unit (5) comprises a temperature sensor (7) thermally coupled to said support plate (2).
    [4]
    4. Stereolithography machine (1) according to either of claims 1 or 2, characterized in that said heating element (6) and said temperature sensor (7) are operatively connected to a control unit suitable to maintain the temperature of said support plate (2) at a constant value.
    [5]
    Stereolithography machine (1) according to any one of claims 1 to 4, characterized in that said heating element (6) is an electrical resistor (6a).
    Petition 870190032910, of 5/5/2019, p. 9/25
    2/3
    [6]
    6. Stereolithography machine (1) according to any one of claims 1 to 5, characterized by the fact that it comprises two of said heating elements (6), thermally coupled to said support plate (2) on opposite sides in relation to said orifice (2a).
    [7]
    7. Stereolithography machine (1) according to any one of claims 1 to 6, characterized by the fact that said heating element (6) is arranged in contact with said support plate (2).
    [8]
    Stereolithography machine (1) according to claim 7, characterized in that said support plate (2) comprises a recess (14) for housing said heating element (6).
    [9]
    9. Stereolithography machine (1), according to claim 8, characterized by the fact that said recess (14) is provided with a cover (8) removably mounted on said support plate (2).
    [10]
    10. Stereolithography machine (1), according to any one of the preceding claims, characterized by the fact that said radiation beam is a laser beam (4a).
    [11]
    11. Stereolithography method comprising the following operations:
    preparing a suitable fluid substance to solidify when exposed to a predetermined beam of radiation;
    preparing a container (3) suitable for containing said fluid substance and provided with a transparent bottom (3a);
    filling said container (3) with said fluid substance;
    associating said container (3) with a support plate (2) provided with an orifice (2a) for the passage of said radiation beam, so that the transparent bottom (3a) of said container (3) is facing said orifice (2a);
    transporting said beam of radiation towards said transparent bottom (3a) through said orifice (2a), characterized by the fact that said fluid substance is a mixture of different components that tend to separate at room temperature, and by the fact that said method comprises the operation of heating said container (3) to maintain said fluid fluid at a predetermined temperature, suitable to avoid said separation of said components.
    Petition 870190032910, of 5/5/2019, p. 10/25
    3/3
    [12]
    12. Stereolithography method, according to claim 11, characterized by the fact that said heating operation of said container (3) is achieved by conducting heat with said support plate (2).
    [13]
    13. Stereolithography method according to claim 12,
    5 characterized by the fact that said support plate (2) is maintained at said predetermined temperature and said heat conduction allows said support plate (2) to keep said container (3) at the same predetermined temperature.
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    法律状态:
    2018-04-10| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-02-05| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|
    2019-05-21| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2019-07-09| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 03/08/2010, OBSERVADAS AS CONDICOES LEGAIS. (CO) 20 (VINTE) ANOS CONTADOS A PARTIR DE 03/08/2010, OBSERVADAS AS CONDICOES LEGAIS |
    2021-06-08| B21F| Lapse acc. art. 78, item iv - on non-payment of the annual fees in time|Free format text: REFERENTE A 11A ANUIDADE. |
    2021-09-28| B24J| Lapse because of non-payment of annual fees (definitively: art 78 iv lpi, resolution 113/2013 art. 12)|Free format text: EM VIRTUDE DA EXTINCAO PUBLICADA NA RPI 2631 DE 08-06-2021 E CONSIDERANDO AUSENCIA DE MANIFESTACAO DENTRO DOS PRAZOS LEGAIS, INFORMO QUE CABE SER MANTIDA A EXTINCAO DA PATENTE E SEUS CERTIFICADOS, CONFORME O DISPOSTO NO ARTIGO 12, DA RESOLUCAO 113/2013. |
    优先权:
    申请号 | 申请日 | 专利标题
    ITVI2009A000207|2009-08-03|
    ITVI2009A000207A|IT1395683B1|2009-08-03|2009-08-03|PERFECT STEREOLITOGRAPHIC MACHINE|
    PCT/EP2010/061247|WO2011015566A2|2009-08-03|2010-08-03|Improved stereolithography machine|
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