• 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:
    The invention relates to a process for producing a plurality of injection-molded parts from fluid plastics which solidify at relatively high temperatures, or from vulcanizing, elastomeric materials, such as silicones or rubber, which, when processed at low temperature, pass through an injection molding nozzle into one of two molding plates (US Pat. 1) molded and solidified there under the influence of heat to the desired injection molded part, and a device, in particular for carrying out this method, wherein at least one of the mold plates (1) at least one nozzle seat for a Anspritzdüse (2) in the form of a Has a cold runner nozzle or a comparable Anspritzdüse, on each of which a series of series-arranged mold cavities (3), which are formed by the two relatively movable mold plates (1) and define the contour of the finished products, as well as after the last mold cavity (3 ) provided for lost cavi (4) successively filled with the thermosetting injection molding compound in one operation, wherein the transition (7) between two adjacent mold cavities (3), and the transition (8) between the last mold cavity (3) in the row and the lost cavity ( 4) depending on the geometry of the injection molded parts, the type of injection molding compound used and the predetermined injection molding conditions are dimensioned so that a reliable filling of all arranged in series mold cavities (3) and at least a partial filling of the lost cavity (4) is guaranteed and the individual When the two mold plates (1) are moved apart and the injection molded parts are detached from each other in a manner known per se, the injection molded parts are separated from one another in such a way that no gate visible to the naked eye remains.
    公开号:AT512318A2
    申请号:T50018/2011
    申请日:2011-12-22
    公开日:2013-07-15
    发明作者:
    申请人:Elast Kunststoffverarbeitungs Gmbh & Co Keg；
    IPC主号:
    专利说明:

    1 15805
    The present invention relates to an injection molding process for thermosetting plastics, in which a plurality of injection-molded parts can be produced in a single operation via a injection nozzle. Thermosetting materials in the context of the invention are essentially fluid plastics which solidify at higher temperatures, or vulcanizing, elastomeric materials, such as silicones or rubber. Such fluid plastics are injected during processing at low temperature via an injection nozzle in a mold cavity and vulcanize there under the influence of heat to the desired injection molded part.
    It is known to produce such injection-molded parts in such a way that no post-processing is required in the region of the gate of the injection-molded article. Corresponding methods and associated devices are i.a. in US 2,883,704, US 3,070,843 and JP OS 48-72258.
    Further, forming devices are known for producing cast-free shaped parts as a result of accurate surface contact of a pair of mold parts forming a mold cavity. From US 3,121,918 a molding apparatus is known in which a chamber is arranged on an upper surface of a lower heating plate. An upper surface of the chamber is covered by a membrane. A heat-resistant liquid is filled in the chamber and kept under pressure. The membrane is deflected by the pressurized fluid and thus maintains a very tight contact between the adjacent molds. Here, one or more cavities may be provided in the molding apparatus for producing sprue-free parts. According to the teaching of this document, however, the production of sprue-free parts is not possible if many cavities are provided in the mold device.
    To remedy this situation, DE 31 07 865 describes a molding apparatus for producing a plurality of sprue-free molded plastic parts, in which the emerging from a spray nozzle, thermosetting material is divided into a plurality of mold cavities arranged side by side. The molding apparatus comprises an upper holding member for fixing at least one upper mold having a channel into which a moldable material is introduced and a lower holding member for fixing at least one lower mold having a cavity, wherein a certain amount of fluid is interposed between a bottom surface of the lower mold and the lower retaining element is filled. In this way, the lower mold floats on the fluid and is movable along the lower holding member.
    After making a surface contact between the bottom surface of the upper mold and the upper surface of the lower mold, a precise mutual contact results due to the back pressure of the fluid. In this way, a plurality of non-casting parts can be sprayed simultaneously in juxtaposed mold cavities.
    A disadvantage of all these devices, however, is that the mold cavities must all be arranged next to one another. A successively provided arrangement of mold cavities, which are successively filled by the thermosetting material and leads to the production of non-casting injection molded parts, is not known from the prior art.
    The present invention therefore has as its object to provide a tool for the simultaneous, non-casting production of a variety of thermosetting injection molded parts, in which a plurality of successively arranged mold cavities can be continuously filled with the thermosetting plastic via an injection nozzle.
    This object is achieved by providing one or more injection nozzles, which are preferably arranged side by side, of which each Anspritzdüse one row of series-shaped mold nests successively filled with the thermosetting injection molding compound and wherein the transition between two adjacent mold cavity depending on the geometry of the finished products a width of about 0.5 to 5 mm, preferably a width of 0.5 to 2 mm, a depth of a few hundredths of a millimeter and a length of a few hundredths of a millimeter and the last mold cavity connects to a so-called lost cavity. The mold cavities which define the contour of the finished products are formed from two relatively movable mold plates.
    The invention is explained below with reference to the figures. It shows:
    Fig. 1 is an oblique view of a erfmdungsgemäße mold plate in the open state; 3
    Fig. 2 is a detail of the mold plate of Figure 1 in plan view;
    3 shows a vertical section through two closed mold plates according to FIG. 1 with the tip of the injection nozzle and a series of cavities, which are subjected to injection molding compound via this injection nozzle; FIG. t
    4 shows an enlarged view of the section according to FIG. 3 in the region of the nozzle tip;
    Fig. 5 is a further partial view of the mold plate.
    In the figures reference is made to mold plates for the production of platelets. It goes without saying, however, that other injection-molded parts which can be produced in this way are also covered by the present invention. The transition geometry is dependent on the geometry of the molded parts to be produced.
    1 has on the underside at least one, but preferably a plurality of seats for Anspritzdüsen 2, wherein each Anspritzdüse 2 are assigned a plurality of successively arranged mold cavities 3 for the produced Spritzgussteiie. Depending on the geometry of the injection-molded parts and the mold plate more or less mold cavities can be acted upon via a Anspritzdüse.
    In FIG. 1, it is provided by way of example that only one row of mold cavities 3 of a injection nozzle 2, which rests in a corresponding nozzle seat, are filled with the injection molding compound. With the mold plate shown in Fig. 1 can thus be hersteilen over 1 Anspritzdüse in a single operation 4 platelets simultaneously. At the end of each row of mold cavities 3 is a passage to a lost cavity 4. It is understood, however, that also several seats for Anspritzdüsen 2 can be provided, each of which a series of series-arranged mold cavity 3 are assigned.
    Depending on the geometry of the product to be produced, the number of injection nozzles can vary within a wide range and the injection nozzles 4 can be arranged arbitrarily, as well as the number of mold cavities, which are acted upon via a Anspritzdüse with the injection molding compound.
    In the detail section of FIG. 2, the transition 7 between adjacent mold cavity 3 and the transition 8 to the lost cavity 4 is shown enlarged. In a preferred embodiment of the invention, the support surfaces 5 of two mold plates are surrounded by free surfaces 6, from which a part of the mold plate material is removed, for example, by milling or countersinking or in another suitable manner. The transitions 7 and 8 are dimensioned so that at the given injection molding conditions a reliable filling of all arranged in series mold cavities and at least a partial filling of the lost cavity 4 is ensured and the products when apart moving the two mold plates and peeling the injection molded parts in a conventional manner separate the individual injection molded parts from each other and have no visible to the naked eye sprue.
    In the illustrated case of a mold plate for the production of platelets of silicone, the transitions 7 and 8, for example, a width of about 1.8 mm, a depth of 0.05 mm and a length of 0.05 mm. Depending on the nature of the injection molding material, the geometry of the product to be manufactured and the given working conditions of the injection molding machine, the dimensions of the transitions 7 and 8 may be 0.5 to 5 mm wide, 0.01 to 0.1 mm deep and 0.01 to 0.1 mm.
    In a further preferred embodiment of the invention, dargstellt in Fig. 3, the adjacent mold cavities 3 and 3 'are not equally divided in the two mold plates, but the adjacent mold cavities 3 and 3' are arranged slightly offset from each other perpendicular to each other in a first mold plate 1, the mold cavity 3 deeper and the adjacent mold cavity 3 'is higher than it would correspond to half its volume, in the corresponding mold plate 1, these ratios are reversed. The individual parts separate from each other when the mold plates are opened and are released in a known manner from the mold plates out. 5
    Here is clearly visible a further advantageous embodiment of the device according to the invention, in which the first mold cavity is injection-molded laterally, for example via a known from EP 1 477 292 Kaltkanalspritzgussdüse or a similar injection molding nozzle. But it is also possible to inject the first mold cavity without sprueing centrally.
    FIG. 5 shows a further detail detail of the mold plate 1 from FIG. 1. In this case too, all mold cavities 3 are filled in successively via the injection point 10, wherein the transitions 7 allow the passage of the injection molding compound from one mold cavity 3 to the next mold cavity 3. It goes without saying that the lateral displacement of the individual mold cavities 3 represents only one possible variant. Again, the support surface 5 may be surrounded by an exposed surface 6 in order to increase the tightness between the bearing surfaces 5.
    The advantage of the invention lies in the fact that a plurality of mold cavities can be filled successively via a injection nozzle and the individual injection-molded parts can be separated from one another during the opening of the mold plates virtually without casting. After the evacuation of the mold cavities, any remaining air collects in the lost cavity 4, whereby a consistently high quality of the injection molded parts can be achieved. At the same time, the expenditure on equipment is reduced, since the number of injection nozzles can be considerably reduced while simultaneously increasing the number of producible injection-molded parts per work step.
    权利要求:
    Claims (14)
    [1]
    Claims 1. A process for producing a plurality of injection molded parts from fluid plastics which solidify at higher temperatures, or from vulcanizing elastomeric materials such as silicones or rubber which, when processed at low temperature, pass into a via a injection nozzle (2) two corresponding mold plates (1) formed mold cavity (3) are molded and solidified there under the influence of heat to the desired injection molded part, characterized in that at least one of the two mold plates (1) at least one nozzle seat for a Anspritzdüse (2) in the form of a cold runner nozzle or a has comparable Anspritzdüse over which in each case a series of series-arranged mold cavity (3), which are formed by the two corresponding and relatively movable mold plates (1) and define the contour of the finished products, as well as after the last mold cavity (3) provided lost cavity (4) n be filled with the thermosetting injection molding compound in a single operation and wherein the transition (7) between two adjacent mold cavities, as well as the transition (8) between the last mold cavity (3) in the row and the lost cavity (4) depending on the geometry of the Injection molded parts, the type of injection molding compound used and the predetermined injection molding conditions are dimensioned so that a reliable filling of all arranged in series mold cavities (3) and at least a partial filling of the lost cavity (4) is guaranteed and the individual injection molded parts when moving apart of the two mold plates (1) and detachment of the injection molded parts in a conventional manner separate from each other so that no recognizable with the naked eye sprue remains.
    [2]
    2. The method according to claim 1, characterized in that on one or both mold plates (1) a number of several juxtaposed Anspritzdüsen (2) are provided, of which each Anspritzdüse (2) a series of series-arranged mold cavity (3), which are formed by two relatively movable mold plates (1) and define the contour 7 of the finished products, successively filled up to the lost cavity (4) with the thermosetting injection molding compound.
    [3]
    3. The method according to claim l, characterized in that on one or both mold plates (1) a plurality of mutually preferably parallel rows of a plurality of juxtaposed Anspritzdüsen (2) are provided, of which each Anspritzdüse (2) a series of arranged in series Formnestem (3), which are formed by two relatively movable mold plates (1) and define the contour of the finished products, successively filled to the lost cavity (4) into the thermosetting injection molding compound.
    [4]
    4. The method of claim 1, 2 or 3, characterized in that the first mold cavity (3) via a Anspritzdüse (2) is sprayed without sprue centrally.
    [5]
    5. The method of claim 1, 2 or 3, characterized in that the first mold cavity (3) via a Anspritzdüse (2) is sprayed laterally without sprue.
    [6]
    6. A device for producing a plurality of injection molded parts from fluid plastics, which solidify at higher temperatures, or from vulcanizing, elastomeric materials, such as silicones or rubber, which in their processing at low temperature via a Anspritzdüse (2) in one of two corresponding Molded mold plates (1) formed mold cavity (3) and there solidified under heat influence to the desired injection molded part, in particular according to a method according to one of claims 1 to 5, characterized in that at least one of the two mold plates (1) at least one nozzle seat for a Anspritzdüse (2), preferably in the form of a cold runner nozzle, has a series of mold cavities (3) arranged in series through the injection nozzle (2), which are formed by the two corresponding mold plates (1) which are movable relative to each other and which are finished Define products as well as one after the last mold nest (3) provided lost cavity (4) successively filled with the thermosetting injection molding compound in one operation, and that the transition 8 (7) between two adjacent mold cavity (3), as well as the transition (8) between the last mold cavity (3) in the series and the lost cavity (4) depending on the geometry of the injection molded parts, the type of injection molding compound used and the given injection molding conditions are dimensioned so that a reliable filling of all arranged in series mold cavities (3) and at least a partial filling of the lost cavity (4) is ensured and the individual injection molded parts when apart of moving the two mold plates (1) and detachment of the injection molded parts in a conventional manner are separable from each other so that no recognizable with the naked eye sprue is present.
    [7]
    7. Apparatus according to claim 6, characterized in that on one or both Formpiatten (1) a number of several juxtaposed Anspritzdüsen (2) are provided, of which each Anspritzdüse (2) a series of series-arranged mold cavities (3), which are formed by the two relative to each other movable, corresponding mold plates (1) and define the contour of the finished products, one after the other to the lost cavity (4) into the heat-curable injection molding compound befülibar.
    [8]
    8. The device according to claim 6, characterized in that on one or both mold plates (1) a plurality of mutually preferably parallel rows of a plurality of juxtaposed Anspritzdüsen (2) are provided, of which each Anspritzdüse (2) a series of arranged in series Formnestem (3), which are formed by the two relatively movable mold plates (1) and define the contour of the finished products, one after the other to the lost cavity (4) into which the heat-curable injection molding compound is ready.
    [9]
    9. Apparatus according to claim 6, 7 or 8, characterized in that the first mold cavity (3) via a Anspritzdüse (2) is injection-free centrally sprayed.
    [10]
    10. Apparatus according to claim 6, 7 or 8, characterized in that the first mold cavity via a Anspritzdüse (2) is injection-free laterally sprayable. 9
    [11]
    11. Device according to one of claims 6 to 10, characterized in that the transition (7) between two adjacent mold cavity (3) and the transition (8) from the last mold cavity (3) of the row to the lost cavity (4) depending on the Geometry of the injection molded parts, the type of injection molding compound used and the given injection molding conditions a width of about 0.5 to 5 mm, preferably a width of 0.5 to 2 mm and more preferably a width of 0.9 to 1.7 mm, a Depth of 0.2 to 0.01 mm, preferably a depth of 0.06 to 0.02 mm and a length of 0.2 to 0.01 mm, preferably a length of 0.06 to 0.02 mm.
    [12]
    12. Device according to one of claims 6 to 11, characterized in that the bearing surfaces (5) of two mold plates (1) are surrounded by exposed surfaces (6), of which a part of the mold plate material, for example by milling or sink erosion or in another suitable manner is slightly removed.
    [13]
    13. Device according to one of claims 6 to 12, characterized in that juxtaposed mold nests (3, 3 ') are not equally divided in the two mold plates (1), but slightly offset from one another perpendicular to each other, wherein the mold cavity (3 ) is higher in a first mold plate (1) and higher in the corresponding second mold plate (1), and the adjacent mold cavity (3 ') is higher in the first mold plate (1) and lower in the corresponding second mold plate (1) than it is Half of its volume corresponds.
    [14]
    14. Device according to one of claims 6 to 13, characterized in that the individual mold cavities (3) are arranged laterally offset from each other in series. 2011 12 22
    类似技术:
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    同族专利:
    公开号 | 公开日
    AT512318B1|2016-06-15|
    AT512318A3|2016-03-15|
    US9364984B2|2016-06-14|
    BR102012032809A2|2014-08-05|
    US20130161870A1|2013-06-27|
    KR20130079204A|2013-07-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE909152C|1949-08-09|1954-04-15|Gen Tire & Rubber Co|Injection molding machine|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50018/2011A|AT512318B1|2011-12-22|2011-12-22|METHOD OF MANUFACTURING INJECTION MOLDED COMPONENTS AND DEVICE FOR CARRYING OUT THIS METHOD|ATA50018/2011A| AT512318B1|2011-12-22|2011-12-22|METHOD OF MANUFACTURING INJECTION MOLDED COMPONENTS AND DEVICE FOR CARRYING OUT THIS METHOD|
    BRBR102012032809-7A| BR102012032809A2|2011-12-22|2012-12-20|METHOD AND APPARATUS FOR PRODUCING VARIOUS INJECTION MOLDS MADE OF FLUID PLASTICS|
    KR1020120150813A| KR20130079204A|2011-12-22|2012-12-21|Method for producing several injection-molded parts|
    US13/726,046| US9364984B2|2011-12-22|2012-12-22|Method and apparatus for producing several injection-molded parts|
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