preform structure

Abstract

This application discloses a front mold structure, including a front mold insert, a runner plate insert, a water bridge, a front template, a sprue plate assembly, a panel, a hot runner assembly, and a front undercut demolding assembly. The front mold insert has a second runner that penetrates itself and connects to the molding cavity. The front undercut demolding assembly includes a slanted spring block, a first elastic element, and a first limiting element. The front mold insert has a slanted guide groove adapted to the shape of the slanted spring block. The end of the slanted spring block away from the panel has an undercut structure adapted to the undercut position of the product. The first limiting element is connected to the end of the slanted spring block near the panel and is used to restrict the slanted spring block from detaching from the front mold insert. The first elastic element is used to provide an elastic force to move the slanted spring block away from the panel. The slanted spring block has a clearance position that penetrates itself, and the second runner is located at the clearance position. The front mold structure of this application allows the injection point to be located at the position of the slanted spring block, avoiding interference between the injection point and the demolding assembly.

Description

Technical Field

[0001] This application relates to the field of injection molding technology, and in particular to a front mold structure. Background Technology

[0002] In the field of injection molding, some products, such as mobile phone casings, laptop casings, and battery casings, have undercuts. When designing the mold, these undercut locations need to meet the ejection requirements of the front mold, and mold ejection components are typically used. During ejection, the angled ejector of the mold ejection component disengages from the undercut location of the plastic product. However, the design location of the injection point sometimes overlaps with that of the mold ejection component. Therefore, how to resolve the overlap between the injection point design location and the ejection component location is a problem that needs to be solved. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a front mold structure that allows the injection point to be located at the position of the inclined spring block, thereby avoiding interference between the injection point and the demolding assembly.

[0004] According to an embodiment of the present invention, the front mold structure includes a front mold insert, a runner plate insert, a water bridge, a front template, a sprue plate assembly, a panel, a hot runner assembly, and a front undercut demolding assembly. The front template, the sprue plate assembly, and the panel are stacked sequentially. The front template has an installation position. The front mold insert, the runner plate insert, and the water bridge are located at the installation position and are sequentially arranged close to the sprue plate assembly. The front mold insert has a second runner that penetrates itself and connects to the molding cavity. The front undercut demolding assembly includes an inclined spring block, a first elastic member, and a first limiting member. The front mold insert has an inclined guide groove that matches the shape of the inclined spring block. The end of the inclined spring block away from the panel has an undercut structure that matches the undercut position of the product. The first limiting member is connected to the end of the inclined spring block near the panel and is used to restrict the inclined spring block from detaching from the front mold insert. The first elastic member is used to provide an elastic force that moves the inclined spring block away from the panel. The inclined spring block has a clearance position that penetrates itself, and the second runner is located at the clearance position.

[0005] The front mold structure according to the embodiment of this utility model has at least the following beneficial effects: This front mold structure includes a front mold plate, a sprue plate assembly, and a panel stacked sequentially. An installation position is provided on the front mold plate. A front mold insert, a runner plate insert, and a water bridge are stacked sequentially on the installation position. A hot runner assembly is provided on the side of the runner plate insert away from the front mold insert. A front undercut demolding assembly is also provided between the front mold insert and the water bridge. The front undercut demolding assembly includes an inclined spring block, a first elastic member, and a first limiting member. The front mold insert has an inclined guide groove for accommodating and sliding the inclined spring block. The first limiting member and the first elastic member are respectively located at the end of the inclined spring block near the panel. The first limiting member is used to restrict the inclined spring block from detaching from the front mold insert, and the first elastic member is used to drive the inclined spring block away from the panel. This allows the inclined spring block to compress the first elastic element during mold closing, thus accommodating it in the front mold insert and serving as the undercut of the product. During mold opening, the inclined spring block slides along the inclined guide groove under the action of the first elastic element and simultaneously disengages from the undercut of the product, thereby achieving demolding. However, due to the limiting effect of the first limiting element, it remains connected in the front mold structure and does not fall off. In addition, the inclined spring block is also provided with a clearance position. The front mold insert is provided with a second flow channel that penetrates itself. The second flow channel is used to connect the hot runner assembly and the molding cavity, and the second flow channel is also located in the clearance position. Therefore, this application can set the clearance position on the inclined spring block so that the injection point can be located at the position of the inclined spring block, thereby avoiding interference between the injection point and the demolding assembly.

[0006] According to some embodiments of the present invention, the first elastic member is located on the side of the flow channel plate insert facing the front mold insert, the first limiting member includes a limiting part and a locking part, the side of the water bridge facing the flow channel plate insert is provided with a first receiving cavity, the flow channel plate insert is provided with a first through hole corresponding to the first receiving cavity, the diameter of the first receiving cavity is larger than the diameter of the first through hole, the locking part is threaded to the inclined spring block, and the limiting part is movably limited to the first receiving cavity.

[0007] According to some embodiments of this utility model, the limiting member is a plug screw.

[0008] According to some embodiments of the present invention, a clamping component is also included. The clamping component passes through the front mold insert, with one end abutting against the runner plate insert and the other end retractably abutting against the steel plate portion of the product. The runner plate insert and the front mold insert are fixedly connected.

[0009] According to some embodiments of the present invention, the clamping assembly includes a second elastic member and a second limiting member. The second elastic member is located between the flow channel plate insert and the second limiting member, and is used to provide the second limiting member with elastic force to clamp the steel plate portion of the product.

[0010] According to some embodiments of the present invention, the second limiting member includes a stop portion and a pressing portion. The front mold insert is provided with a first limiting groove and a second through hole communicating with the first limiting groove. The first limiting groove is disposed towards the flow channel plate insert. The second through hole penetrates the side of the front mold insert away from the first limiting groove. The diameter of the first limiting groove is larger than that of the second through hole. The pressing portion is disposed in the second through hole. The diameter of the stop portion is larger than that of the pressing portion and is limited in the first limiting groove.

[0011] According to some embodiments of the present invention, a receiving groove is provided at one end of the second limiting member facing the flow channel plate insert, and the second elastic member is limited between the receiving groove and the flow channel plate insert.

[0012] According to some embodiments of this utility model, the end of the inclined spring block away from the panel is also provided with a clearance hole, which is used to avoid the rear mold structure.

[0013] According to some embodiments of the present invention, the hot runner assembly includes a hot nozzle assembly and a sprue hook. The runner plate insert has a first runner on the side near the water bridge. The runner plate insert has a third runner that passes through it. The third runner connects the first runner and the second runner. One end of the sprue hook is fixed to the sprue plate assembly, and the other end passes through the water bridge and is inserted at the intersection of the first runner and the third runner.

[0014] According to some embodiments of the present invention, the hot nozzle assembly includes a hot nozzle and a hot nozzle sleeve fitted on the hot nozzle. The hot nozzle passes through the panel, the sprue plate assembly and the water bridge, and is connected to the first flow channel.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the front mold structure and the corresponding rear mold structure of the present invention.

[0018] Figure 2 for Figure 1 One of the cross-sectional views of the front mold structure and the corresponding rear mold structure shown in the figure;

[0019] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0020] Figure 4 for Figure 1 Another cross-sectional view of the front mold structure and the corresponding rear mold structure shown in the figure;

[0021] Figure 5 for Figure 1 The diagram shows the structure of the front undercut demolding assembly, the sprue hook, and the sprue.

[0022] Figure label:

[0023] Front mold insert 100; second runner 110; runner plate insert 200; first runner 220; water bridge 300; front mold plate 400; sprue plate assembly 500; panel 600; hot runner assembly 700; hot nozzle assembly 710; sprue hook 720; front undercut demolding assembly 800; inclined spring block 810; undercut structure 811; clearance position 812; clearance hole 813; first elastic element 820; first limiting element 830; limiting part 831; locking part 832; clamping assembly 900; second elastic element 910; second limiting element 920; stop part 921; clamping part 922; sprue 1000; molding cavity 1100; rear mold structure 1200. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0025] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0028] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] The following is for reference. Figures 1 to 5 The front mold structure of an embodiment of this utility model is described.

[0030] like Figures 1 to 5 As shown, the front mold structure according to an embodiment of the present invention includes a front mold insert 100, a runner plate insert 200, a water bridge 300, a front template 400, a sprue plate assembly 500, a panel 600, a hot runner assembly 700, and a front undercut demolding assembly 800. The front template 400, the sprue plate assembly 500, and the panel 600 are stacked sequentially. The front template 400 has an installation position. The front mold insert 100, the runner plate insert 200, and the water bridge 300 are located at the installation position and are sequentially arranged close to the sprue plate assembly 500. The front mold insert 100 has a second runner 110 that penetrates itself and communicates with the molding cavity 1100. The front undercut... The demolding assembly 800 includes a slanted spring block 810, a first elastic element 820, and a first limiting element 830. The front mold insert 100 is provided with a slanted guide groove adapted to the shape of the slanted spring block 810. The end of the slanted spring block 810 away from the panel 600 is provided with an undercut structure 811 adapted to the undercut position of the product. The first limiting element 830 is connected to the end of the slanted spring block 810 near the panel 600 and is used to limit the slanted spring block 810 from disengaging from the front mold insert 100. The first elastic element 820 is used to provide an elastic force that moves the slanted spring block 810 away from the panel 600. The slanted spring block 810 is provided with a clearance position 812 that penetrates itself, and the second flow channel 110 is located at the clearance position 812.

[0031] Understandably, this front mold structure includes a front mold plate 400, a sprue plate assembly 500, and a face plate 600 stacked sequentially. An installation position is provided in the front mold plate 400, and a front mold insert 100, a runner plate insert 200, and a water bridge 300 are stacked sequentially in the installation position. A hot runner assembly 700 is provided on the side of the runner plate insert 200 away from the front mold insert 100. A front undercut demolding assembly 80 is also provided between the front mold insert 100 and the water bridge 300. 0. The front undercut demolding assembly 800 includes a slanted spring block 810, a first elastic element 820, and a first limiting element 830. The front mold insert 100 is provided with a slanted guide groove for the slanted spring block 810 to be accommodated and slid. The first limiting element 830 and the first elastic element 820 are respectively provided at one end of the slanted spring block 810 near the panel 600. The first limiting element 830 is used to restrict the slanted spring block 810 from disengaging from the front mold insert 100, and the first elastic element 820 is used to drive the slanted spring block 810 to move away from the panel 600. The inclined spring block 810 is 600 away from the panel, so that when the mold is closed, the inclined spring block 810 can squeeze the first elastic element 820, thereby realizing that it is housed in the front mold insert 100 and used to form the undercut position of the product. When the mold is opened, the inclined spring block 810 can slide along the inclined guide groove under the action of the first elastic element 820 and disengage from the undercut position of the product, thereby realizing demolding. However, due to the limiting effect of the first limiting element 830, it can remain connected in the front mold structure and not fall off. In addition, the inclined spring block 810 is also provided with a clearance position 812. The front mold insert 100 is provided with a second flow channel 110 that penetrates itself. The second flow channel 110 is used to connect the hot runner assembly 700 and the molding cavity 1100. At the same time, the second flow channel 110 is also located at the clearance position 812. Therefore, this application can set the injection point at the position of the inclined spring block 810 by setting the clearance position 812 on the inclined spring block 810, thereby avoiding interference between the injection point and the demolding assembly.

[0032] The molding cavity 1100 is located on the side of the front mold insert 100 away from the runner plate insert 200, and is located between the front mold insert 100 and the rear mold insert in the molding die, for use as a cavity for molding the product.

[0033] Understandably, the first elastic element 820 is located on the side of the runner plate insert 200 facing the front mold insert 100, the first limiting element 830 includes a limiting part 831 and a locking part 832, the water bridge 300 has a first receiving cavity on the side facing the runner plate insert 200, the runner plate insert 200 has a first through hole corresponding to the first receiving cavity, the diameter of the first receiving cavity is larger than the diameter of the first through hole, the locking part 832 is threaded to the inclined spring block 810, and the limiting part 831 is movably limited in the first receiving cavity. For example, as Figures 1 to 5As shown, in this embodiment, the first elastic member 820 is disposed on the flow channel plate insert 200, the limiting part 831 of the first limiting member 830 is disposed in the first receiving cavity of the water bridge 300, and the locking part 832 of the first limiting member 830 is located in the first through hole of the flow channel plate insert 200 and is threadedly locked to the inclined spring block 810. The outer diameter of the limiting part 831 is larger than the inner diameter of the first through hole, thereby limiting it in the first receiving cavity, thereby achieving the limiting of the inclined spring block 810. The size of the inclined spring block 810 is larger than the inner diameter of the first through hole.

[0034] It is understandable that the limiting component is a push-button screw. For example, as... Figures 1 to 5 As shown, in this embodiment, the locking length of the inclined spring block 810 can be accurately controlled by the structure of the plug screw, thereby ensuring that the tightening height of the inclined spring block 810 is determined during the compression of the first elastic element 820, thus improving the positional accuracy of the formed end of the inclined spring block 810. Of course, in some other embodiments, a cup head screw can also be used.

[0035] Understandably, it also includes a clamping assembly 900, which passes through the front mold insert 100, with one end abutting against the runner plate insert 200 and the other end retractably abutting against the steel plate portion of the product. The runner plate insert 200 and the front mold insert 100 are fixedly connected. For example, as... Figures 1 to 5 As shown, in this embodiment, the product includes a steel plate portion and an injection-molded portion. In this embodiment, before injection molding, the steel plate portion is placed in the molding position, so that the injection-molded portion is connected with the steel plate portion to form the entire product. Therefore, in order to avoid displacement of the steel plate portion during injection molding, a clamping component 900 is provided through the front mold insert 100. When the mold is closed, the clamping component 900 is located between the runner plate insert 200 and the steel plate portion of the product. Since the clamping component 900 is retractable, it can clamp the steel plate portion of the product under the restriction of the runner plate insert 200, thereby avoiding displacement of the steel plate portion during the mold closing process and ensuring the yield rate of the injection-molded product.

[0036] It is understood that the clamping assembly 900 includes a second elastic member 910 and a second limiting member 920. The second elastic member 910 is located between the flow channel plate insert 200 and the second limiting member 920, and is used to provide the second limiting member 920 with an elastic force to clamp the steel plate portion of the product. For example, as Figures 1 to 5 As shown, in this embodiment, the pressing assembly 900 includes a second elastic member 910 and a second limiting member 920 disposed sequentially away from the flow channel plate insert 200. The second limiting member 920 can press the steel plate portion under the elastic force of the second elastic member 910 to achieve positioning of the steel plate portion.

[0037] It is understood that the second limiting member 920 includes a stop portion 921 and a clamping portion 922. The front mold insert 100 is provided with a first limiting groove and a second through hole communicating with the first limiting groove. The first limiting groove is disposed towards the flow channel plate insert 200, and the second through hole penetrates the side of the front mold insert 100 away from the first limiting groove. The diameter of the first limiting groove is larger than that of the second through hole. The clamping portion 922 is disposed in the second through hole, and the diameter of the stop portion 921 is larger than that of the clamping portion 922 and is limited by the first limiting groove. For example, as Figures 1 to 5 As shown, in this embodiment, the stop portion 921 of the second limiting member 920 is located in the first limiting groove of the front mold insert 100, and the pressing portion 922 of the second limiting member 920 is located in the second through hole of the front mold insert 100. The outer diameter of the stop portion 921 is larger than the inner diameter of the second through hole, thereby limiting it in the first limiting groove and preventing the second limiting member 920 from disengaging from the front mold insert 100.

[0038] It is understood that the second limiting member 920 has a receiving groove at one end facing the flow channel plate insert 200, and the second elastic member 910 is limited between the receiving groove and the flow channel plate insert 200. For example, as Figures 1 to 5 As shown, in this embodiment, the second elastic member 910 is located between the receiving groove of the second limiting member 920 and the flow channel plate insert 200, thereby both pressing the second limiting member 920 and limiting the second elastic member 910.

[0039] Understandably, the end of the inclined spring block 810 furthest from the panel 600 is also provided with a clearance hole 813, which is used to avoid the rear mold structure 1200. For example, as Figures 1 to 5 As shown in this embodiment, when holes are required at the bottom of the product, and in order to better position the steel plate part in the product, a positioning pin is often provided on the side of the rear mold structure 1200 facing the front mold structure. At this time, the end of the inclined spring block 810 away from the panel 600 needs to be provided with an avoidance hole 813 to avoid the positioning pin and other positioning structures.

[0040] Understandably, the hot runner assembly 700 includes a hot nozzle assembly 710 and a sprue hook 720. The runner plate insert 200 has a first runner 220 on the side near the water bridge 300. The runner plate insert 200 has a third runner penetrating through it, connecting the first runner 220 and the second runner 110. One end of the sprue hook 720 is fixed to the sprue plate assembly 500, and the other end passes through the water bridge 300 and is inserted at the intersection of the first runner 220 and the third runner. For example, as... Figures 1 to 5As shown, in this embodiment, the hot runner assembly 700 includes a hot nozzle assembly 710 and a sprue hook 720. The runner plate insert 200 is provided with a first runner 220 located near the water bridge 300 and a third runner penetrating through itself. One end of the sprue hook 720 is fixed to the sprue plate assembly 500, and the other end passes through the water bridge 300 and is inserted at the junction of the third runner and the first runner 220, thereby enabling the sprue hook 720 to pull the sprue 1000 in the second runner 110 after mold opening.

[0041] It is understood that the hot nozzle assembly 710 includes a hot nozzle and a hot nozzle sleeve fitted onto the hot nozzle. The hot nozzle passes through the panel 600, the sprue plate assembly 500, and the water bridge 300, and connects to the first flow channel 220. For example, as... Figures 1 to 5 As shown, in this embodiment, the hot runner assembly 700 is fitted with a hot nozzle sleeve, which is inserted into the water bridge 300. The hot nozzle is connected to the first flow channel 220, thereby enabling injection molding into the molding cavity 1100 through the third flow channel and the second flow channel 110.

[0042] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A former structure, characterized by, The device includes a front mold insert, a runner plate insert, a water bridge, a front template, a sprue plate assembly, a panel, a hot runner assembly, and a front undercut demolding assembly. The front template, the sprue plate assembly, and the panel are stacked sequentially. The front template has an installation position. The front mold insert, the runner plate insert, and the water bridge are located at the installation position and are sequentially arranged close to the sprue plate assembly. The front mold insert has a second runner that penetrates itself and connects to the molding cavity. The front undercut demolding assembly includes a slanted spring block, a first elastic element, and a first limiting element. The front mold insert has a slanted guide groove that matches the shape of the slanted spring block. The end of the slanted spring block away from the panel has an undercut structure that matches the undercut position of the product. The first limiting element is connected to the end of the slanted spring block near the panel and is used to restrict the slanted spring block from detaching from the front mold insert. The first elastic element is used to provide an elastic force that moves the slanted spring block away from the panel. The slanted spring block has a clearance position that penetrates itself, and the second runner is located at the clearance position.

2. The forward mold structure of claim 1, wherein, The first elastic element is located on the side of the runner plate insert facing the front mold insert. The first limiting element includes a limiting part and a locking part. The side of the water bridge facing the runner plate insert is provided with a first receiving cavity. The runner plate insert is provided with a first through hole corresponding to the first receiving cavity. The diameter of the first receiving cavity is larger than the diameter of the first through hole. The locking part is threaded to the inclined spring block. The limiting part is movably limited to the first receiving cavity.

3. The front mold structure according to claim 2, characterized in that, The limiting component is a stop screw.

4. The front mold structure according to claim 1, characterized in that, It also includes a clamping assembly, which passes through the front mold insert, with one end abutting against the runner plate insert and the other end retractably abutting against the steel plate portion of the product, wherein the runner plate insert and the front mold insert are fixedly connected.

5. The front mold structure according to claim 4, characterized in that, The clamping assembly includes a second elastic element and a second limiting element. The second elastic element is located between the flow channel plate insert and the second limiting element, and is used to provide the second limiting element with an elastic force to clamp the steel plate portion of the product.

6. The front mold structure according to claim 5, characterized in that, The second limiting member includes a stop portion and a pressing portion. The front mold insert is provided with a first limiting groove and a second through hole communicating with the first limiting groove. The first limiting groove is disposed towards the flow channel plate insert. The second through hole penetrates the side of the front mold insert away from the first limiting groove. The diameter of the first limiting groove is larger than the diameter of the second through hole. The pressing portion passes through the second through hole. The diameter of the stop portion is larger than the pressing portion and is limited in the first limiting groove.

7. The front mold structure according to claim 6, characterized in that, The second limiting member has a receiving groove at one end facing the flow channel plate insert, and the second elastic member is limited between the receiving groove and the flow channel plate insert.

8. The front mold structure according to claim 1, characterized in that, The inclined spring block is also provided with a clearance hole at the end away from the panel, which is used to avoid the rear mold structure.

9. The front mold structure according to claim 1, characterized in that, The hot runner assembly includes a hot nozzle assembly and a sprue hook. The runner plate insert has a first runner on the side near the water bridge. The runner plate insert has a third runner that passes through it. The third runner connects the first runner and the second runner. One end of the sprue hook is fixed to the sprue plate assembly, and the other end passes through the water bridge and is inserted at the intersection of the first runner and the third runner.

10. The front mold structure according to claim 9, characterized in that, The hot nozzle assembly includes a hot nozzle and a hot nozzle sleeve fitted onto the hot nozzle. The hot nozzle passes through the panel, the sprue plate assembly, and the water bridge, and is connected to the first flow channel.

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