Injection mold capable of guaranteeing coaxiality

Abstract

An injection mold capable of guaranteeing coaxiality comprises a front mold plate and a rear mold plate, a front mold core is embedded in the front mold plate, a rear mold core is embedded in the rear mold plate, a cavity is formed between the front mold core and the rear mold core, a product is provided with rotating shaft holes, the rotating shaft holes comprise a first rotating shaft hole and a second rotating shaft hole, and the rear mold core is provided with a matching hole. The injection mold capable of guaranteeing coaxiality further comprises two slide seats, a first slide insert pin and a second slide insert pin are installed on the two slide seats respectively, the first slide insert pin, the second slide insert pin and the matching hole are coaxially arranged, guide inclined holes are formed in the slide seats, and an inclined guide column is arranged on the front mold plate. During mold closing, the first slide insert pin and the second slide insert pin respectively penetrate into the matching holes, and the front mold core, the rear mold core, the slide seat, the first slide insert pin and the second slide insert pin jointly define a cavity; when the product is formed in the cavity, the axis of the matching hole, the axis of the first rotating shaft hole and the axis of the second rotating shaft hole coincide.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold with guaranteed coaxiality. Background Art

[0002] Currently, some injection molded products are provided with a shaft hole for installing a shaft component.

[0003] In the prior art, the shaft hole of the product is generally formed by inserting a pin on each side of the injection mold cavity, with the end of the inserted pin resting against the mold. When the pin is pulled out after injection molding, the shaft hole is formed.

[0004] However, since the end of the inlay pin rests against the mold, when the product is glued, the glue risks deforming or displacing the inlay pin, causing the two formed shaft holes to deform and become eccentric, making it impossible to ensure coaxiality, which affects the smooth installation of the shaft component; since the diameter of the inlay pin is small, frequent contact with the mold can easily cause deformation of the inlay pin, affecting the coaxiality of the two ends of the shaft hole and reducing product quality.

[0005] In addition, the inlay pin is generally an integrated structure with the slide. The inlay pin is a wearing part. If the inlay pin is damaged, it needs to be replaced together with the slide, which is inconvenient for disassembly and maintenance, and also increases the maintenance cost. Utility Model Content

[0006] The purpose of the utility model is to provide an injection mold with guaranteed coaxiality, so as to solve the problems that the inlay pins currently used for forming the shaft hole are easy to deform, easy to deviate and inconvenient to disassemble and maintain.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] An injection mold to ensure coaxiality includes a front template and a rear template. The front template is embedded with a front mold core, and the rear template is embedded with a rear mold core. A cavity for molding a product is provided between the front mold core and the rear mold core. The product has a rotating shaft hole provided therethrough. The rotating shaft hole includes a first rotating shaft hole and a second rotating shaft hole. The rear mold core is provided with a matching hole provided therethrough. The injection mold to ensure coaxiality also includes two slide seats symmetrically provided on the rear template. A first slide pin and a second slide pin are detachably installed on the two slide seats. The first slide pin, the second slide pin and the matching hole are coaxially provided. A guiding inclined hole is provided on the seat and the slider seat can slide on the rear template, and the front template is provided with an inclined guide column matching the guiding inclined hole; when the mold is closed, the first slider pin and the second slider pin partially penetrate into the matching holes from both ends of the matching holes, and the front mold core, the rear mold core, the slider seat, the first slider pin and the second slider pin jointly surround the molding cavity, and the product is molded in the molding cavity; when the product is molded in the molding cavity, the axis center of the matching hole, the axis center of the first rotating shaft hole and the axis center of the second rotating shaft hole coincide with each other, the first slider pin part is located in the first rotating shaft hole, and the second slider pin part is located in the second rotating shaft hole.

[0009] Furthermore, a rear mold insert is detachably mounted on the rear mold core, and a matching hole is provided through the rear mold insert. The front mold core, rear mold core, rear mold insert, slide seat, first slide insert pin, and second slide insert pin jointly surround the molding cavity.

[0010] Furthermore, the first slide pin has a first mating portion mating with the mating hole, a first mounting portion connected to the slide seat, and a first molded portion connecting the first mating portion and the first mounting plate; the second slide pin has a second mating portion mating with the mating hole, a second mounting portion connected to another slide seat, and a second molded portion connecting the second mating portion and the second mounting portion.

[0011] Furthermore, the diameter of the first formed portion is greater than the diameter of the first matching portion; and the diameter of the second formed portion is greater than the diameter of the second matching portion.

[0012] Furthermore, the side of the first forming part facing the matching hole is the first limiting surface, and the side of the second forming part facing the matching hole is the second limiting surface; when the mold is closed, the first limiting surface and the second limiting surface respectively abut against the outer periphery of the matching hole.

[0013] Furthermore, the first matching portion and the second matching portion are respectively inserted into the matching hole, and the sum of the axial length of the first matching portion and the axial length of the second matching portion is less than the hole length of the matching hole.

[0014] Furthermore, the end of the first matching portion is provided with a rounded corner structure; the end of the second matching portion is provided with a rounded corner structure.

[0015] Furthermore, the first row pin also has a first connecting portion, the two ends of which are respectively connected to the first matching portion and the first forming portion; the second row pin also has a second connecting portion, the two ends of which are respectively connected to the second matching portion and the second forming portion.

[0016] Furthermore, the diameter of the first connecting portion is greater than the diameter of the first formed portion; and the diameter of the second connecting portion is greater than the diameter of the second formed portion.

[0017] Furthermore, the side of the first connecting portion facing the matching hole is the first abutting surface, and the side of the second connecting portion facing the matching hole is the second abutting surface; when the mold is closed, the first abutting surface and the second abutting surface respectively abut against the product.

[0018] The present invention provides an injection mold with beneficial effects of ensuring coaxiality: the first row pin and the second row pin are partially inserted into the matching holes respectively, so that the end parts of the first row pin and the second row pin can be supported in the matching holes, reducing the risk of the first row pin and the second row pin being deformed or misaligned by the rubber material, avoiding the first row pin and the second row pin frequently abutting against the rear mold core and causing deformation, ensuring that the axis centers of the first row pin and the second row pin always coincide, and achieving the coaxiality of the first rotating shaft hole and the second rotating shaft hole; the coaxial arrangement of the first row pin, the second row pin and the matching holes can further ensure the coaxiality of the first rotating shaft hole and the second rotating shaft hole; in addition, the first row pin and the second row pin are respectively a split and detachable structure with the row seat, so that the first row pin and the second row pin can be conveniently disassembled and assembled when deformed or damaged, thereby reducing the maintenance cost of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a cross-sectional view of an injection mold for ensuring coaxiality according to Example 1 of the present utility model.

[0020] Figure 2 for Figure 1 Schematic diagram of the first row of pins shown.

[0021] Figure 3 for Figure 1 Schematic diagram of the second row of pins shown.

[0022] Figure 4 for Figure 1 A magnified schematic diagram.

[0023] Figure 5 This is a cross-sectional view of an injection mold for ensuring coaxiality according to Example 2 of the present utility model.

[0024] Figure 6 for Figure 1 Schematic diagram of the first row of pins shown.

[0025] Figure 7 for Figure 1 Schematic diagram of the second row of pins shown.

[0026] Figure 8 for Figure 5 Schematic diagram after enlargement of point B in the middle.

[0027] Figure 9 for Figure 5 Enlarged schematic diagram of point C in the middle.

[0028] Figure 10 It is a cross-sectional view of the product of the present utility model. DETAILED DESCRIPTION

[0029] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] The terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", "horizontal", etc. in the specification and claims of the present utility model indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the clarity of expressing the technical solutions and the convenience of description, and therefore cannot be understood as limiting the present application.

[0031] Example 1:

[0032] See also Figure 1 , Figure 4 and Figure 10 A coaxial injection mold includes a front template 10 and a rear template 20. The front template 10 is embedded with a front mold core 11, and the rear template 20 is embedded with a rear mold core 21. A cavity for molding a product 40 is provided between the front mold core 11 and the rear mold core 21. The product 40 has a rotating shaft hole 41 provided therethrough. The rotating shaft hole 41 includes a first rotating shaft hole 411 and a second rotating shaft hole 412.

[0033] The rear mold core 21 is provided with a mating hole 211 extending therethrough. The injection mold for ensuring coaxiality also includes two slider seats 30 symmetrically disposed on the rear mold plate 20. A first slider pin 31 and a second slider pin 32 are detachably mounted on the slider seats 30. The first slider pin 31, the second slider pin 32, and the mating hole 211 are coaxially arranged. The slider seats 30 are provided with an inclined guide hole 33 and are slidable on the rear mold plate 20. The front mold plate 10 is provided with an inclined guide post 12 that mates with the inclined guide hole 33.

[0034] When the mold is closed, the first row position pin 31 and the second row position pin 32 respectively partially penetrate the matching hole 211 from both ends of the matching hole 211. The front mold core 11, the rear mold core 21, the row position seat 30, the first row position pin 31, and the second row position pin 32 together form the mold cavity, and the product 40 is formed in the mold cavity.

[0035] When the product 40 is formed in the mold cavity, the axis center of the matching hole 211, the axis center of the first rotating shaft hole 411, and the axis center of the second rotating shaft hole 412 coincide with each other, the first row position pin 31 is partially located in the first rotating shaft hole 411, and the second row position pin 32 is partially located in the second rotating shaft hole 412.

[0036] As described above, the injection mold for ensuring coaxiality proposed by the present invention partially penetrates the first row pin 31 and the second row pin 32 into the matching hole 211 respectively, so that the end of the first row pin 31 and the end of the second row pin 32 can be supported on the matching hole 211, reducing the risk of the first row pin 31 and the second row pin 32 being deformed or misaligned by the rubber, avoiding the first row pin 31 and the second row pin 32 from frequently abutting against the rear mold core 21 and causing deformation, and ensuring the axis of the first row pin 31 and the second row pin 32 are aligned with each other. The axis of the slide pin 32 always coincides, thereby ensuring the coaxiality of the first shaft hole 411 and the second shaft hole 412; by coaxially arranging the first slide pin 31, the second slide pin 32, and the matching hole 211, the coaxiality of the first shaft hole 411 and the second shaft hole 412 can be further guaranteed; in addition, the first slide pin 31 and the second slide pin 32 are respectively a separate and detachable structure with the slide seat 30, so that the first slide pin 31 and the second slide pin 32 can be easily disassembled and assembled when deformed or damaged, thereby reducing the maintenance cost of the mold.

[0037] In this embodiment, a rear mold insert 212 is detachably mounted on the rear mold core 21. The mating hole 211 is formed through the rear mold insert 212. The front mold core 11, the rear mold core 21, the rear mold insert 212, the slider seat 30, the first slider pin 31, and the second slider pin 32 collectively form the mold cavity. By installing the rear mold insert 212 on the rear mold core 21, the rear mold insert 212 can be easily replaced when worn, eliminating the need to replace the entire rear mold core 21, thereby extending the service life of the rear mold core 21.

[0038] See also Figure 1-Figure 4 and Figure 10The first slide pin 31 has a first mating portion 311 mating with the mating hole 211, a first mounting portion 313 connected to the slide seat 30, and a first molded portion 312 connecting the first mating portion 311 and the first mounting portion 313; the second slide pin 32 has a second mating portion 321 mating with the mating hole 211, a second mounting portion 323 connected to another slide seat 30, and a second molded portion 322 connecting the second mating portion 321 and the second mounting portion 323.

[0039] More specifically, the front mold core 11, the rear mold insert 212, the slide seat 30, the first molding part 312, and the second molding part 322 together form the mold cavity. When the mold is closed, the first molding part 312 and the second molding part 322 are in contact with the rubber material respectively. The first molding part 312 and the second molding part 322 are used to form the first shaft hole 411 and the second shaft hole 412 respectively.

[0040] Furthermore, the diameter of the first molding portion 312 is larger than the diameter of the first mating portion 311, and the diameter of the second molding portion 322 is larger than the diameter of the second mating portion 321. The surface of the first molding portion 312 facing the mating hole 211 is a first limiting surface 3121, and the surface of the second molding portion 322 facing the mating hole 211 is a second limiting surface 3221. When the mold is closed, the first limiting surface 3121 and the second limiting surface 3221 respectively abut against the outer periphery of the mating hole 211. The first limiting surface 3121 and the second limiting surface 3221 act as limiters, preventing the first mating portion 311 and the second mating portion 321 from excessively penetrating the mating hole 211 and causing collision and deformation.

[0041] Furthermore, the first fitting portion 311 and the second fitting portion 321 are respectively inserted into the fitting hole 211, and the sum of the axial length L1 of the first fitting portion 311 and the axial length L2 of the second fitting portion 321 is less than the hole length L3 of the fitting hole 211, which can ensure that the first fitting portion 311 and the second fitting portion 321 do not collide when they penetrate the fitting hole 211 in opposite directions, thereby avoiding the collision and deformation of the first row position pin 31 and the second row position pin 32.

[0042] Furthermore, the end of the first mating portion 311 is provided with a rounded corner structure 50 ; the end of the second mating portion 321 is provided with a rounded corner structure 50 . The rounded corner structure 50 enables the first mating portion 311 and the second mating portion 321 to pass through the mating hole 211 more smoothly.

[0043] Example 2:

[0044] A coaxiality-guaranteed injection mold has a structure similar to that of the coaxiality-guaranteed injection mold in Example 1, except that:

[0045] See also Figure 5-Figure 9 The first row position needle 31 also has a first connecting part 314, and the two ends of the first connecting part 314 are respectively connected to the first matching part 311 and the first forming part 312; the second row position needle 32 also has a second connecting part 324, and the two ends of the second forming part 322 are respectively connected to the second matching part 321 and the second forming part 322.

[0046] Furthermore, the diameter of the first connecting portion 314 is larger than the diameter of the first molded portion 312, and the diameter of the second connecting portion 324 is larger than the diameter of the second molded portion 322. The larger diameters of the first connecting portion 314 and the second connecting portion 324 respectively enhance the strength of the first and second positioning pins 31 and 32, thereby reducing the risk of deformation or misalignment of the first and second positioning pins 31 and 32 by the rubber.

[0047] More specifically, the surface of the first connecting portion 314 facing the mating hole 211 is a first abutting surface 3141, and the surface of the second connecting portion 324 facing the mating hole 211 is a second abutting surface 3241. When the mold is closed, the first abutting surface 3141 and the second abutting surface 3241 respectively abut against the product 40. The front mold core 11, the rear mold insert 212, the slider 30, the first molding portion 312, the second molding portion 322, the first connecting portion 314, and the second connecting portion 324 collectively form the mold cavity.

[0048] The advantages of the coaxiality-guaranteed injection mold of the utility model are as follows:

[0049] (1) The risk of deformation or misalignment of the insert pin caused by the rubber material is reduced, the deformation of the insert pin caused by frequent contact with the rear mold core is avoided, and the failure rate of the insert pin is reduced.

[0050] (2) Ensure the coaxiality of the product's shaft hole.

[0051] (3) It is convenient to disassemble and maintain the pin, which reduces the maintenance cost of the mold.

[0052] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An injection mold for ensuring coaxiality, comprising a front template and a rear template, wherein the front template is embedded with a front mold core, the rear template is embedded with a rear mold core, a cavity for molding a product is provided between the front mold core and the rear mold core, the product having a through-set rotating shaft hole, the rotating shaft hole comprising a first rotating shaft hole and a second rotating shaft hole, characterized in that: The rear mold core is provided with a matching hole, and the injection mold for ensuring coaxiality further comprises two slider seats symmetrically arranged on the rear template, and a first slider pin and a second slider pin are detachably mounted on the two slider seats, respectively, and the first slider pin, the second slider pin and the matching hole are coaxially arranged, a guide inclined hole is provided on the slider seat and the slider seat can slide on the rear template, and the front template is provided with an inclined guide column that matches the guide inclined hole; When the mold is closed, the first and second row pins are partially inserted into the matching holes from both ends of the matching hole. The front mold core, the rear mold core, the row seat, the first and second row pins together form the mold cavity, and the product is molded in the mold cavity. When the product is formed in the mold cavity, the axis center of the matching hole, the axis center of the first rotating shaft hole, and the axis center of the second rotating shaft hole coincide with each other, the first row pin-inserting part is located in the first rotating shaft hole, and the second row pin-inserting part is located in the second rotating shaft hole.

2. The injection mold for ensuring coaxiality according to claim 1, wherein: The rear mold core is detachably mounted with a rear mold insert, the matching hole is penetrated through the rear mold insert, and the front mold core, the rear mold core, the rear mold insert, the slide seat, the first slide insert pin, and the second slide insert pin together form the mold cavity.

3. The injection mold for ensuring coaxiality according to any one of claims 1-2, characterized in that: The first slide pin has a first mating portion mating with the mating hole, a first mounting portion connected to the slide seat, and a first molded portion connecting the first mating portion and the first mounting portion; the second slide pin has a second mating portion mating with the mating hole, a second mounting portion connected to another slide seat, and a second molded portion connecting the second mating portion and the second mounting portion.

4. The injection mold for ensuring coaxiality according to claim 3, wherein: The diameter of the first forming portion is greater than the diameter of the first matching portion; the diameter of the second forming portion is greater than the diameter of the second matching portion.

5. The injection mold for ensuring coaxiality according to claim 4, wherein: The side of the first forming part facing the matching hole is a first limiting surface, and the side of the second forming part facing the matching hole is a second limiting surface; when the mold is closed, the first limiting surface and the second limiting surface respectively abut against the outer periphery of the matching hole.

6. The injection mold for ensuring coaxiality according to claim 5, wherein: The first matching portion and the second matching portion are respectively inserted into the matching hole, and the sum of the axial length of the first matching portion and the axial length of the second matching portion is less than the hole length of the matching hole.

7. The injection mold for ensuring coaxiality according to claim 6, wherein: The end of the first matching portion is provided with a rounded corner structure; the end of the second matching portion is provided with a rounded corner structure.

8. The injection mold for ensuring coaxiality according to claim 3, wherein: The first position pin also has a first connecting portion, the two ends of which are respectively connected to the first matching portion and the first forming portion; the second position pin also has a second connecting portion, the two ends of which are respectively connected to the second matching portion and the second forming portion.

9. The injection mold for ensuring coaxiality according to claim 8, wherein: The diameter of the first connecting portion is greater than the diameter of the first forming portion; and the diameter of the second connecting portion is greater than the diameter of the second forming portion.

10. The injection mold for ensuring coaxiality according to claim 9, wherein: The side of the first connecting portion facing the matching hole is a first abutting surface, and the side of the second connecting portion facing the matching hole is a second abutting surface; when the mold is closed, the first abutting surface and the second abutting surface respectively abut against the product.

Images