Full-circle undercut core-pulling mold

Abstract

This application discloses a full-circumference undercut core-pulling mold, including an upper mold and a lower mold. The upper mold includes: an upper template; an upper mold core embedded in the upper template and forming a molding cavity with the lower mold; and a core-pulling mechanism including: a molding component disposed within the upper mold core, the molding component including a support member, a protrusion, and multiple molding inserts, the support member having a receiving groove and an opening, the protrusion being movably connected to the support member, the multiple molding inserts surrounding the bottom of the receiving groove and protruding from the opening into the molding cavity, the multiple molding inserts forming a conical abutment; a core-pulling assembly movably inserted within the receiving groove; and a support assembly connected to the core-pulling assembly. The core-pulling assembly, driven by the upper template, releases multiple molding inserts, creating a demolding gap between the molding inserts and the full-circumference undercut structure of the product. The support assembly, through the protrusion, drives the support member to move away from the lower mold, causing the released molding inserts to detach from the product, completing the demolding operation of the product with full-circumference undercuts.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to a full-circumference undercut core-pulling mold. Background Technology

[0002] Nowadays, when injection molds are used to mold products with internal cavities, the core-pulling mechanism moves out of the product's internal cavity when the injection mold is opened, thus completing the product demolding.

[0003] Because some products have a full-circumference undercut structure in their inner cavity, the core-pulling mechanism will collide with the full-circumference undercut structure of the product during the demolding operation, causing the full-circumference undercut structure of the product to deform and reducing the product quality. Summary of the Invention

[0004] In view of the above, it is necessary to propose a full-circumference undercut core-pulling mold to complete the demolding of products with full-circumference undercuts.

[0005] This application provides a full-circumference undercut core-pulling mold, including a suitable upper mold and a lower mold. The upper mold includes: an upper template; an upper mold core, embedded in the upper template and forming a molding cavity with the lower mold, for injection molding a product with a full-circumference undercut structure; and a core-pulling mechanism, including: a molding component disposed within the upper mold core. The molding component includes a support member, a protrusion, and multiple molding inserts. The support member has a connected receiving groove and an opening. The protrusion is disposed on one side of the support member and movably connected to the support member. The multiple molding inserts surround the bottom of the receiving groove and protrude from the opening into the molding cavity to form the full-circumference undercut structure of the product. The structure includes a conical abutment formed between multiple molding inserts; a core-pulling assembly movably inserted into the receiving groove, which is inserted into the conical abutment when the upper and lower molds are closed to abut against the multiple molding inserts; the core-pulling assembly moves away from the lower mold when the upper and lower molds are opened to release the multiple molding inserts; and a support assembly disposed on one side of the core-pulling assembly and connected to the core-pulling assembly, which abuts against the protrusion when the upper and lower molds are opened and drives the support assembly to move away from the lower mold to drive the released molding inserts out of the product.

[0006] During the operation of the aforementioned full-circumference undercut core-pulling mold, firstly, the upper and lower molds close, and the core-pulling assembly is inserted into the conical support portion to support multiple molding inserts, preventing them from shaking during injection molding and ensuring that the multiple molding inserts stably form the full-circumference undercut structure of the product. Next, after the product is formed, the upper and lower molds open, and the upper mold plate moves the core-pulling assembly away from the lower mold and out of the conical support portion, allowing the core-pulling assembly to release multiple molding inserts. The multiple molding inserts retract inward toward the central axis of the receiving groove, creating a demolding gap between the molding inserts and the full-circumference undercut structure of the product. Finally, the upper and lower molds continue to open, and the support assembly, driven by the core-pulling assembly, supports the protrusion, causing the support assembly to move the carrier component away from the lower mold through the protrusion, so that the carrier component pulls the released molding inserts away from the product. Thus, by setting up a core-pulling assembly, multiple molding inserts can be released under the action of the upper mold plate, creating a demolding gap between the molding inserts and the product's full-circumference undercut structure to complete the first core-pulling demolding operation. By setting up molding and support assemblies, the support assembly can drive the carrier to move away from the lower mold through the protrusion, causing the released molding inserts to detach from the product to complete the second core-pulling demolding operation. This allows the product to be completely demolded from the molding cavity, preventing deformation of the product's full-circumference undercut structure, and thus completing the demolding operation of the product with full-circumference undercut.

[0007] In some embodiments, the molding insert includes: an insert body that passes through the opening and extends into the molding cavity, and the insert body has a retaining slope on the side facing the core-pulling assembly, the core-pulling assembly abutting the insert body through the retaining slope to form the full-circumference undercut structure of the product; and an insert end that connects to the insert body and abuts the bottom of the receiving groove to support the insert body.

[0008] In some embodiments, the insert body is further provided with a guide groove, which is located on the abutting inclined surface and slidably connected to the core-pulling assembly to guide the core-pulling assembly.

[0009] In some embodiments, the upper mold further includes a limiting member connected to the upper mold core and located above the protrusion, and the supporting component is movably disposed through the limiting member, and a limiting gap is formed between the limiting member and the bearing member to limit the molding component.

[0010] In some embodiments, the protrusion includes: an elastic portion, wherein a receiving groove is provided on one side of the carrier, the elastic portion is disposed in the receiving groove, and one end of the elastic portion is connected to the bottom of the receiving groove; and a protrusion, wherein the protrusion is slidably disposed in the receiving groove and connected to the other end of the elastic portion, and is movable between a locked position and an unlocked position, wherein the protrusion abuts against the limiting member in the locked position to lock the carrier, or abuts against the supporting component in the unlocked position and passes through the limiting gap to unlock the carrier.

[0011] In some embodiments, the protrusion further includes a limiting pin, the limiting pin including a limiting body and a pin body connected together, the pin body passing through the protrusion and the elastic part, and one end of the pin body being connected to the limiting body located in the receiving groove, and the other end of the pin body being connected to the carrier member, for limiting the protrusion.

[0012] In some embodiments, the core-pulling assembly includes: a linkage member movably inserted through the receiving groove, one end of the linkage member being connected to the upper template, the linkage member moving towards or away from the lower mold under the drive of the upper template; and a core-pulling member connected to the other end of the linkage member and adapted to the conical abutment portion, the core-pulling member being inserted into the conical abutment portion to abut against a plurality of the molding inserts.

[0013] In some embodiments, the receiving groove includes: a first receiving groove, which receives and is adapted to the linkage member for guiding the linkage member; and a second receiving groove, the two ends of which are respectively connected to the first receiving groove and the opening, and the second receiving groove receives and is adapted to the core-pulling member for limiting the core-pulling member.

[0014] In some embodiments, the support component includes: a connector that is movably inserted through the limiting member and connected to the core-pulling assembly; and a support member disposed at one end of the connector away from the core-pulling assembly, wherein the support member has a support slope on the side facing the carrier member, and the support member presses against the protrusion to the unlocking position through the support slope to support the protrusion.

[0015] In some embodiments, the full-circumference undercut structure is disposed on the product along a first direction, and the upper mold further includes: a fixing member, the fixing member is disposed between the upper template and the core-pulling mechanism along a second direction and is connected to the upper template, the core-pulling mechanism is inclined along the first direction and is slidably connected to the fixing member, and the upper template drives the core-pulling mechanism to detach from the product through the fixing member, wherein the second direction is set at a preset angle with the first direction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the product's three-dimensional structure.

[0017] Figure 2 A three-dimensional structural diagram of the full-circumference undercut core-pulling mold provided in the embodiments of this application.

[0018] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the full-circumference undercut core-pulling mold along the III-III direction.

[0019] Figure 4 for Figure 1 The diagram shows a three-dimensional structure of the core-pulling mechanism, limiting component, and fixing component.

[0020] Figure 5 for Figure 4 The diagram shows a cross-sectional view of the core-pulling mechanism, limiting component, and fixing component along the V-V direction.

[0021] Figure 6 for Figure 4 The diagram shows an exploded view of the core-pulling mechanism, limiting components, and fixing components.

[0022] Figure 7 for Figure 6 The diagram shows a three-dimensional structure of the molded insert.

[0023] Figure 8 for Figure 5 A partially enlarged schematic diagram of position VIII of the core-pulling mechanism shown.

[0024] Explanation of main component symbols

[0025] Full-circle undercut core-pulling mold 100

[0026] Upper mold 101

[0027] Molding cavity 1011

[0028] Lower mold 102

[0029] Template 10

[0030] Upper mold 20

[0031] Core pulling mechanism 30

[0032] Molded component 31

[0033] Bearing component 311

[0034] Receiving tank 3111

[0035] First receiving groove 3111a

[0036] Second receiving tank 3111b

[0037] Opening 3112

[0038] Containment slot 3113

[0039] Locking position 3113a

[0040] Unlock bit 3113b

[0041] Protrusion 312

[0042] Elastic part 3121

[0043] Protrusion 3122

[0044] Limit pin 3123

[0045] Limiting body 3123a

[0046] Pin 3123b

[0047] Molding insert 313

[0048] Conical support part 3131

[0049] Sub-body 3132

[0050] Resisting slope 3132a

[0051] Guide groove 3132b

[0052] Insert end 3133

[0053] Core-pulling assembly 32

[0054] Linkage component 321

[0055] Core-pulling component 322

[0056] Support component 33

[0057] Connector 331

[0058] Support component 332

[0059] Supporting inclined plane 3321

[0060] Limiting component 40

[0061] Limit gap 41

[0062] Product 200

[0063] Full circumference undercut structure 201 Detailed Implementation

[0064] To better understand the objectives, features, and advantages of this invention, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments of the invention and the features within them can be combined with each other. Numerous specific details are set forth in the following description to provide a thorough understanding of the invention; the described embodiments are only a part of, and not all, of the embodiments of the invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be incorporated into the present invention.

[0068] The embodiments of the invention will be further described below with reference to the accompanying drawings.

[0069] Please see Figure 1 , Figure 1 This is a three-dimensional structural diagram of product 200, which has a full-circumference inverted structure 201 inside.

[0070] Please see Figure 2 The present invention provides a full-circumference undercut core-pulling mold 100, which includes a suitable upper mold 101 and a lower mold 102.

[0071] Please see Figure 3 The upper mold 101 includes an upper template 10, an upper mold core 20, and a core-pulling mechanism 30. The upper mold core 20 is embedded in the upper template 10 and forms a molding cavity 1011 with the lower mold 102 to injection mold a product 200 with a full-circumferential undercut structure 201.

[0072] Please see Figure 4 The core-pulling mechanism 30 includes a molding component 31, a core-pulling component 32, and a supporting component 33. The molding component 31 is located inside the upper mold core 20.

[0073] Please see Figure 5 The molding component 31 includes a support member 311, a protrusion 312, and a plurality of molding inserts 313. The support member 311 is provided with a connected receiving groove 3111 and an opening 3112. The protrusion 312 is located on one side of the support member 311 and is movably connected to the support member 311. The plurality of molding inserts 313 surround the bottom of the receiving groove 3111 and protrude from the opening 3112 into the molding cavity 1011 to form the full-circumference undercut structure 201 of the product 200, and a conical abutment portion 3131 is formed between the plurality of molding inserts 313.

[0074] The core-pulling assembly 32 is movably inserted into the receiving groove 3111. When the upper mold 101 and the lower mold 102 are closed, the core-pulling assembly 32 is inserted into the conical abutment part 3131 to abut against multiple molding inserts 313. When the upper mold 101 and the lower mold 102 are opened, the core-pulling assembly 32 moves away from the lower mold 102 to release the multiple molding inserts 313.

[0075] The support component 33 is located on one side of the core-pulling component 32 and connected to the core-pulling component 32. When the upper mold 101 and the lower mold 102 are opened, the support component 33 abuts against the protrusion 312 and drives the carrier component 311 to move away from the lower mold 102, so as to drive the loosened molding insert 313 to detach from the product 200.

[0076] The working process of the above-mentioned full-circumference undercut core-pulling mold 100 is roughly as follows:

[0077] First, the upper mold 101 and the lower mold 102 are closed, and the core-pulling assembly 32 is inserted into the conical support portion 3131 so that the core-pulling assembly 32 supports multiple molding inserts 313, preventing the molding inserts 313 from shaking when the product 200 is injection molded, so that the multiple molding inserts 313 stably form the full-circumference undercut structure 201 of the product 200;

[0078] Next, after the product 200 is formed, the upper mold 101 and the lower mold 102 open. The upper mold plate 10 drives the core-pulling assembly 32 to move away from the lower mold 102 and move out of the conical support part 3131, so that the core-pulling assembly 32 releases multiple molding inserts 313. The multiple molding inserts 313 all retract inward toward the central axis of the receiving groove 3111, so that a demolding gap is formed between the molding inserts 313 and the full-circumference undercut structure 201 of the product 200.

[0079] Finally, the upper mold 101 and the lower mold 102 continue to open. The supporting component 33 is supported by the protrusion 312 under the action of the core-pulling component 32, so that the supporting component 33 drives the carrier component 311 to move away from the lower mold 102 through the protrusion 312, so that the carrier component 311 drives the loosened molding insert 313 to detach from the product 200.

[0080] Thus, by setting the core-pulling assembly 32, multiple molding inserts 313 can be released under the action of the upper template 10, creating a demolding gap between the molding inserts 313 and the full-circumference undercut structure 201 of the product 200, thereby completing the first core-pulling demolding operation. By setting the molding assembly 31 and the supporting assembly 33, the supporting assembly 33 can drive the bearing member 311 to move away from the lower mold 102 through the protrusion 312, causing the released molding inserts 313 to detach from the product 200, thereby completing the second core-pulling demolding operation. This allows the product 200 to be completely demolded from the molding cavity 1011, preventing deformation of the full-circumference undercut structure of the product 200, and thus completing the demolding operation of the product 200 with the full-circumference undercut structure 201.

[0081] Please see Figure 6 In some embodiments, the molding insert 313 includes an insert body 3132 and an insert end 3133. The insert body 3132 passes through the opening 3112 and extends into the molding cavity 1011. See also Figure 7 The insert body 3132 has a retaining slope 3132a on the side facing the core-pulling assembly 32. The core-pulling assembly 32 abuts against the insert body 3132 through the retaining slope 3132a to form the full-circumference undercut structure 201 of the product 200. The insert end 3133 is connected to the insert body 3132 and abuts against the bottom of the receiving groove 3111 to support the insert body 3132.

[0082] Thus, by providing a retaining slope 3132a on the side of the insert body 3132 facing the core-pulling assembly 32, a conical retaining portion 3131 can be formed between the retaining slopes 3132a of multiple insert bodies 3132. The core-pulling assembly 32 is inserted into the conical retaining portion 3131 to retain the insert body 3132, so that the insert body 3132 stably forms the full circumferential undercut structure 201 of the product 200, avoiding shaking of the insert body 3132 when forming the product 200 and deformation of the full circumferential undercut structure 201, thereby improving the molding stability.

[0083] In addition, by setting the insert end 3133 to connect with the insert body 3132 and abut against the bottom of the receiving groove 3111, when the second core pulling demolding is performed, the insert end 3133 can support the insert body 3132, so that the carrier 311 can drive the insert body 3132 to detach from the product 200 through the insert end 3133, thereby completing the second core pulling demolding operation, preventing the insert body 3132 from interfering with the full circumferential undercut structure 201 of the product 200 and causing deformation, and realizing the core pulling demolding operation of the product 200 with the full circumferential undercut structure 201.

[0084] Please see Figure 7 In some embodiments, the insert body 3132 is further provided with a guide groove 3132b, which is located on the abutting inclined surface 3132a and slidably connected to the core-pulling assembly 32 to guide the core-pulling assembly 32.

[0085] Thus, by setting the guide groove 3132b, when the injection-molded product 200 is used, the guide groove 3132b can guide the core-pulling assembly 32, so that the core-pulling assembly 32 is stably inserted into the conical support portion 3131 under the guidance of the guide groove 3132b, thereby making the core-pulling assembly 32 stably support multiple molding inserts 313, and thus making the molding inserts 313 stably form the full-circumference undercut structure 201 of the product 200, improving the molding stability.

[0086] Please see Figure 5 In some embodiments, the upper mold 101 further includes a limiting member 40, which is connected to the upper mold core 20 and located above the protrusion 312. The supporting component 33 is movably inserted through the limiting member 40, and a limiting gap 41 is formed between the limiting member 40 and the bearing member 311 to limit the forming component 31.

[0087] When the core-pulling assembly 32 is not completely detached from the multiple molding inserts 313, the molding inserts 313 are attached to the full circumferential undercut structure 201 of the product 200. That is, the molding inserts 313 do not form a demolding gap with the full circumferential undercut structure 201 of the product 200. If the carrier 311 moves away from the lower mold 102 under the drive of the support assembly 33, the molding inserts 313 will interfere with the full circumferential undercut structure 201 of the product 200, causing the product 200 to deform. Thus, by setting the limiting member 40, a limiting gap 41 is formed between the limiting member 40 and the carrier member 311. When the core-pulling assembly 32 has not completely detached the multiple molding inserts 313, the lower surface of the limiting member 40 abuts against the protrusion 312, and the protrusion 312 cannot pass through the limiting gap 41. This allows the limiting member 40 to limit the carrier member 311 through the limiting gap 41, preventing the carrier member 311 from interfering with the multiple molding inserts 313 that have not been detached from the product 200. When the core-pulling assembly 32 has completely detached the multiple molding inserts 313, the supporting assembly 33 is pressed against the protrusion 312 under the action of the core-pulling assembly 32. This allows the supporting assembly 33 to support the protrusion 312 through the limiting gap 41, thereby allowing the carrier member 311 to drive the detached multiple molding inserts 313 out of the product 200. This enables the core-pulling mechanism 30 to stably complete the demolding operation of the product 200, thereby improving the demolding stability.

[0088] Please see Figure 6 In some embodiments, the protrusion 312 includes an elastic portion 3121 and a protrusion 3122. A receiving groove 3113 is provided on one side of the support member 311, and the elastic portion 3121 is disposed within the receiving groove 3113, with one end of the elastic portion 3121 connected to the bottom of the receiving groove 3113. The protrusion 3122 is slidably disposed within the receiving groove 3113 and connected to the other end of the elastic portion 3121.

[0089] Please see Figure 8 The protrusion 3122 can move between the locking position 3113a and the unlocking position 3113b. In the locking position 3113a, the protrusion 3122 abuts against the limiting member 40 to lock the carrier member 311, or in the unlocking position 3113b, it abuts against the supporting component 33 and passes through the limiting gap 41 to unlock the carrier member 311. In this embodiment, the elastic part 3121 can be a spring.

[0090] When the core-pulling assembly 32 is not completely detached from the multiple molded inserts 313, the elastic part 3121 provides elastic force to drive the protrusion 3122 to move to the locking position 3113a, so that the protrusion 3122 abuts against the lower surface of the limiting member 40. The protrusion 3122 cannot pass through the limiting gap 41, so that the protrusion 3122 locks the carrier member 311, preventing the carrier member 311 from driving the multiple detached molded inserts 313 to interfere with the full-circumference undercut structure 201 of the product 200. When the core-pulling assembly 32 is completely detached from the multiple molded inserts 313, the supporting assembly 33 presses the protrusion 3122 to the unlocking position 3113b and compresses the elastic part 3121 to the bottom of the receiving groove 3113, so that the supporting assembly 33 drives the protrusion 3122 to pass through the limiting gap 41, so that the carrier member 311 drives the multiple detached molded inserts 313 to detach from the product 200.

[0091] Thus, by providing the elastic part 3121 and the protrusion 3122, the elastic part 3121 can drive the protrusion 3122 to abut against the limiting member 40 to lock the carrier member 311 when the molding insert 313 is not loosened, or the protrusion 3122 can compress the elastic part 3121 to the bottom of the receiving groove 3113 to unlock the carrier member 311 when the molding insert 313 is loosened, thereby enabling the full-circumference undercut core-pulling mold 100 to stably complete the product 200 separation, thereby improving the demolding stability.

[0092] Please see Figure 6 In some embodiments, the protrusion 312 further includes a limiting pin 3123. The limiting pin 3123 includes a limiting body 3123a and a pin body 3123b connected together. The pin body 3123b passes through the protrusion 3122 and the elastic part 3121, and one end of the pin body 3123b is connected to the limiting body 3123a located in the receiving groove 3113, and the other end of the pin body 3123b is connected to the carrier 311 for limiting the protrusion 3122. In this embodiment, the limiting pin 3123 can be a pin.

[0093] Thus, by setting the limiting body 3123a, the limiting body 3123a can limit the movement distance of the protrusion 3122, preventing the protrusion 3122 from moving too far under the drive of the elastic part 3121 and dislodging it from the receiving groove 3113, thereby improving the demolding stability.

[0094] In addition, by setting the pin 3123b, the pin 3123b can limit the movement direction of the protrusion 3122, so that the protrusion 3122 always moves along the setting direction of the pin 3123b, thereby making the protrusion 3122 always move between the locking position 3113a and the unlocking position 3113b, preventing the protrusion 3122 from shifting position, and thus making the protrusion 3122 stably lock or unlock the carrier 311, further improving the demolding stability.

[0095] In some embodiments, the core-pulling assembly 32 includes a linkage member 321 and a core-pulling member 322. The linkage member 321 is movably disposed in the receiving groove 3111, and one end of the linkage member 321 is connected to the upper template 10. The linkage member 321 moves toward or away from the lower mold 102 under the drive of the upper template 10. The core-pulling member 322 is connected to the other end of the linkage member 321 and is adapted to the conical abutment portion 3131. The core-pulling member 322 is inserted into the conical abutment portion 3131 to abut against a plurality of molding inserts 313.

[0096] When product 200 is injection molded, the upper mold 101 and lower mold 102 close. The upper mold plate 10 drives the core-pulling component 322 to move towards the lower mold 102 via the linkage component 321. The core-pulling component 322 is inserted into the conical abutment portion 3131. Because the core-pulling component 322 is adapted to the conical abutment portion, the core-pulling component 322 stably abuts against multiple molding inserts 313, preventing the molding inserts 313 from shaking when product 200 is being molded, thus ensuring that the molding inserts 313 stably injection mold product 200. The product 200 has a full-circumferential undercut structure 201. When the product 200 is demolded, the upper mold 101 and the lower mold 102 open. The upper mold plate 10 drives the core-pulling component 322 to move away from the lower mold 102 via the linkage component 321. The core-pulling component 322 moves out from the conical abutment part 3131 to release multiple molding inserts 313. A demolding gap is formed between the multiple molding inserts 313 and the full-circumferential undercut structure 201 to avoid interference between the molding inserts 313 and the full-circumferential undercut structure 201 during secondary core-pulling demolding. In this way, by setting the linkage component 321 and the core-pulling component 322, the upper mold plate 10 can drive the core-pulling component 322 to move towards or away from the lower mold 102 via the linkage component 321, so that the full-circumferential undercut core-pulling mold 100 can stably injection mold the product 200 with the full-circumferential undercut structure 201 and avoid deformation of the product 200 during core-pulling demolding.

[0097] Please see Figure 8 In some embodiments, the receiving groove 3111 includes a first receiving groove 3111a and a second receiving groove 3111b. The first receiving groove 3111a receives and is adapted to the linkage member 321, and is used to guide the linkage member 321. The two ends of the second receiving groove 3111b are respectively connected to the first receiving groove 3111a and the opening 3112, and the second receiving groove 3111b receives and is adapted to the core-pulling member 322, and is used to limit the core-pulling member 322.

[0098] Thus, by setting the first receiving groove 3111a to receive the linkage 321 and adapting it to the linkage 321, the first receiving groove 3111a can guide the linkage 321, so that the linkage 321 always moves in the direction of the upper mold 101 pointing to the lower mold 102 under the guidance of the first receiving groove 3111a, avoiding the linkage 321 from being misaligned and interfering with other components, so that the linkage 321 can stably drive the core-pulling member 322 to be inserted into the conical support portion 3131, or stably drive the core-pulling member 322 to be moved out of the conical support portion 3131, thereby improving the injection molding stability and demolding stability. In addition, by setting a second receiving groove 3111b to receive the core-pulling component 322 and adapting it to the core-pulling component 322, the second receiving groove 3111b can limit the movement distance of the core-pulling component 322. When the first core-pulling demolding is completed, the core-pulling component 322 abuts against the bottom of the groove of the second receiving groove 3111b, so that the supporting component 33 supports the protrusion 312 through the limiting gap 41, thereby causing the linkage component 321 to drive the carrier component 311 to move away from the lower mold 102 through the supporting component 33, and then causing the carrier component 311 to drive the loosened molding insert 313 to detach from the product 200, so as to complete the second core-pulling demolding operation.

[0099] Please see Figure 6 In some embodiments, the support component 33 includes a connector 331 and a support component 332. The connector 331 is movably inserted through the limiting member 40 and connected to the core-pulling component 32. The support component 332 is located at the end of the connector 331 away from the core-pulling component 32, and the support component 332 has a supporting inclined surface 3321 on the side facing the support member 311. The support component 332 presses against the protrusion 3122 to the unlocking position 3113b through the supporting inclined surface 3321 to support the protrusion 3122.

[0100] Thus, by setting the connector 331 and the support 332, when the first core pulling demolding is completed, the core pulling assembly 32 drives the support 332 to move to the underside of the protrusion 3122 through the connector 331. Since the support 332 has a supporting inclined surface 3321 on the side facing the carrier 311, the support 332 can press the protrusion 3122 to the unlocking position 3113b through the supporting inclined surface 3321, so that the support 332 supports the protrusion 3122 to pass through the limiting gap 41, thereby causing the support 332 to drive the multiple molding inserts 313 carried by the carrier 311 to detach from the product 200, thereby completing the second core pulling demolding operation and realizing the demolding operation of the product 200 with the full circumferential undercut structure 201.

[0101] In some embodiments, please refer to Figure 1 The full-circumference undercut structure 201 is provided on the product 200 along the first direction. Please refer to [link / reference]. Figure 4The upper mold 101 also includes a fixing member 50, which is disposed between the upper template 10 and the core-pulling mechanism 30 along a second direction and connected to the upper template 10. The core-pulling mechanism 30 is inclined along a first direction and slidably connected to the fixing member 50. The upper template 10 drives the core-pulling mechanism 30 to detach from the product 200 through the fixing member 50. The second direction and the first direction are set at a preset angle. In this embodiment, Figure 4 Establish a Cartesian three-dimensional coordinate system, with the first direction being the orientation of the full-circumference inverted structure 201. Figure 4 The Z-axis direction shown is the second direction, which is perpendicular to the upper mold 101 and points to the lower mold 102.

[0102] Since the full-circumference undercut structure 201 of some products 200 is inclined along the first direction, by setting the fixing member 50 along the second direction between the upper template 10 and the core-pulling mechanism 30 and connecting it to the upper template 10, and setting the core-pulling mechanism 30 along the first direction and slidingly connecting it to the fixing member 50, when the product 200 is demolded, the upper mold 101 and the lower mold 102 open, which allows the fixing member 50 to drive the core-pulling mechanism 30 to move away from the lower mold 102. At the same time, it drives the core-pulling mechanism 30 to slide synchronously in the second direction within the fixing member 50, avoiding interference between the molding insert 313 of the core-pulling mechanism 30 and the full-circumference undercut structure 201 that is inclined along one direction, so that the core-pulling mechanism 30 moves inclined along the first direction, so that the molding insert 313 can stably detach from the product 200 along the first direction, thus improving the demolding stability.

[0103] The working process of the above-mentioned full-circumference undercut core-pulling mold 100 is roughly as follows:

[0104] First, the upper mold 101 and the lower mold 102 are closed. The upper mold plate 10 drives the core-pulling component 322 to move towards the lower mold 102 through the linkage component 321. The core-pulling component 322 is inserted into the conical support portion 3131 so that the core-pulling component 322 stably supports multiple molding inserts 313, preventing the molding inserts 313 from shaking when the product 200 is injection molded, so that the multiple molding inserts 313 stably form the full circumferential undercut structure 201 of the product 200.

[0105] Next, after the product 200 is formed, the upper mold 101 and the lower mold 102 open. The upper mold plate 10 drives the core-pulling component 322 to move away from the lower mold 102 through the linkage component 321. The core-pulling component 322 moves out from the conical support part 3131 to release multiple molding inserts 313. Multiple molding inserts 313 all shrink inward toward the central axis of the receiving groove 3111, so that a demolding gap is formed between the molding inserts 313 and the full circumferential undercut structure 201 of the product 200.

[0106] Finally, the upper mold 101 and the lower mold 102 continue to open. The linkage 321 drives the support 332 to move below the protrusion 3122 through the connector 331. Then, the support 332 presses the protrusion 3122 against the unlocking position 3113b through the support slope 3321, so that the support 332 supports the protrusion 3122 to pass through the limiting gap 41, so that the carrier 311 drives the loosened molding insert 313 to detach from the product 200.

[0107] Thus, by setting the core-pulling assembly 32, multiple molding inserts 313 can be released under the action of the upper template 10, so that a demolding gap is formed between the molding inserts 313 and the full-circumference undercut structure 201 of the product 200, thereby completing the first core-pulling demolding operation. By setting the molding assembly 31 and the supporting assembly 33, the supporting assembly 33 can drive the bearing 311 to move away from the lower mold 102 through the protrusion 312, so that the released molding inserts 313 are separated from the product 200, thereby completing the second core-pulling demolding operation. This allows the product 200 to be completely demolded from the molding cavity 1011, avoiding deformation of the full-circumference undercut structure of the product 200, and thus completing the demolding operation of the product 200 with full-circumference undercut.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A full-circumference undercut core-pulling mold, comprising a suitable upper mold and a lower mold, characterized in that, The upper mold includes: Upload template; The upper mold core is embedded in the upper mold plate and forms a molding cavity with the lower mold to injection mold a product with a full-circumference undercut structure; The core-pulling mechanism includes: A molding assembly is disposed within the upper mold core. The molding assembly includes a support member, a protrusion, and a plurality of molding inserts. The support member has a connected receiving groove and an opening. The protrusion is disposed on one side of the support member and is movably connected to the support member. The plurality of molding inserts surround the bottom of the receiving groove and protrude from the opening into the molding cavity to form the full-circumference undercut structure of the product. A conical abutment is formed between the plurality of molding inserts. A core-pulling assembly is movably disposed within the receiving groove. When the upper mold and the lower mold are closed, the core-pulling assembly is inserted into the conical abutment portion to abut against a plurality of the molding inserts. When the upper mold and the lower mold are opened, the core-pulling assembly moves away from the lower mold to release the plurality of molding inserts. A support component is disposed on one side of the core-pulling component and connected to the core-pulling component. When the upper mold and the lower mold are opened, the support component abuts against the protrusion and drives the carrier component to move away from the lower mold, so as to drive the loosened molding insert to detach from the product.

2. The full-circumference undercut core-pulling mold as described in claim 1, characterized in that, The molding insert includes: The insert body passes through the opening and extends into the molding cavity, and the insert body has a retaining slope on the side facing the core-pulling assembly. The core-pulling assembly abuts against the insert body through the retaining slope to form the full-circumference undercut structure of the product. The insert end is connected to the insert body and abuts against the bottom of the receiving groove to support the insert body.

3. The full-circumference undercut core-pulling mold as described in claim 2, characterized in that, The insert body is also provided with a guide groove, which is located on the abutting inclined surface and slidably connected to the core-pulling assembly to guide the core-pulling assembly.

4. The full-circumference undercut core-pulling mold as described in claim 1, characterized in that, The upper mold also includes: A limiting member is connected to the upper mold core and located above the protrusion, and the supporting component is movably inserted through the limiting member. A limiting gap is formed between the limiting member and the supporting component to limit the molding component.

5. The full-circumference undercut core-pulling mold as described in claim 4, characterized in that, The protrusion includes: The elastic part has a receiving groove on one side of the bearing member, and the elastic part is disposed in the receiving groove, with one end of the elastic part connected to the bottom of the receiving groove. The protrusion is slidably disposed in the receiving groove and connected to the other end of the elastic part, and can move between a locked position and an unlocked position. The protrusion abuts against the limiting member in the locked position to lock the carrier, or abuts against the supporting component in the unlocked position and passes through the limiting gap to unlock the carrier.

6. The full-circumference undercut core-pulling mold as described in claim 5, characterized in that, The protrusion also includes: A limiting pin, comprising a limiting body and a pin body connected together, the pin body passing through the protrusion and the elastic part, one end of the pin body being connected to the limiting body located in the receiving groove, and the other end of the pin body being connected to the carrier member, for limiting the protrusion.

7. The full-circumference undercut core-pulling mold as described in claim 1, characterized in that, The core-pulling assembly includes: A linkage component is movably inserted into the receiving groove. One end of the linkage component is connected to the upper template. The linkage component moves towards or away from the lower template under the drive of the upper template. A core-pulling component is connected to the other end of the linkage component and adapted to the conical abutment portion. The core-pulling component is inserted into the conical abutment portion to abut against a plurality of the molding inserts.

8. The full-circumference undercut core-pulling mold as described in claim 7, characterized in that, The receiving groove includes: A first receiving groove is provided, which accommodates and is adapted to the linkage component, and is used to guide the linkage component. The second receiving groove has two ends connected to the first receiving groove and the opening, respectively, and the second receiving groove accommodates the core-pulling component and is adapted to the core-pulling component to limit the core-pulling component.

9. The full-circumference undercut core-pulling mold as described in claim 5, characterized in that, The support component includes: A connector is movably inserted through the limiting member and connected to the core-pulling assembly; A support member is provided at the end of the connector away from the core-pulling assembly, and the support member has a supporting slope on the side facing the carrier member. The support member presses the protrusion to the unlocking position through the supporting slope to support the protrusion.

10. The full-circumference undercut core-pulling mold as described in claim 1, characterized in that, The full-circumference undercut structure is disposed on the product along the first direction, and the upper mold further includes: A fixing member is provided between the upper template and the core-pulling mechanism along a second direction and is connected to the upper template. The core-pulling mechanism is inclined along a first direction and is slidably connected to the fixing member. The upper template drives the core-pulling mechanism to detach from the product through the fixing member. The second direction is set at a preset angle with the first direction.

Images