Injection mold for inner buckle hole injection molding part

Abstract

The utility model relates to an injection mold for an inner buckle hole injection molding part, which comprises a rear mold bottom plate, a rear mold cushion block, a rear mold connecting plate, a rear mold plate, a rear mold core, a rear mold core, a front mold bottom plate, a front mold plate and a front mold core, a rear mold outer forming surface is arranged on the front side of the rear mold core, the rear mold connecting plate is provided with guide strips, the guide strips are provided with buckle forming strips, and the guide strips are arranged in parallel in pairs. Guide steps are arranged on the opposite sides of the guide strips, the guide steps on the two guide strips are in a splayed shape, openings of the guide steps on the two guide strips face forwards, the buckle forming strips are provided with guide sliding grooves matched with the guide steps, the guide sliding grooves are dovetail grooves, the rear mold plate is provided with a pushing part, and bosses used for forming inner buckle holes are arranged at the front ends of the opposite sides of the buckle forming strips. According to the utility model, the guide strip is matched with the buckle forming strip, so that the buckle forming strip moves forwards along with the rear mold core in the initial stage of demolding and contracts inwards at the same time, the buckle forming strip is separated from an inner buckle of an injection-molded part, and the injection-molded part is not damaged during demolding.

Description

Technical Field

[0001] This utility model relates to injection molds, and in particular to an injection mold for injection molded parts with internal buckles. Background Technology

[0002] Injection molded parts are highly malleable, allowing for the creation of complex components using injection molds. Furthermore, due to their typically good elasticity, they often incorporate snap-fit ​​structures. For some cap-type injection molded parts, internal snap-fits are a common feature. When the injection molded part is small, the internal snap-fits are usually demolded using a forceful release method. This method results in shallow internal snap-fits, leading to weak clamping force during use. When deeper internal snap-fits are used, demolding can easily damage them. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an injection mold for injection molded parts with internal buckles.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: an injection mold for an internally recessed injection molded part, comprising a rear mold base plate, a rear mold pad block disposed on the front side of the rear mold base plate, a rear mold connecting plate disposed on the front side of the rear mold pad block, a rear mold template disposed on the front side of the rear mold connecting plate, a rear mold core disposed on the front side of the rear mold template, a rear mold core disposed on the rear mold core, a front mold base plate, a front mold template disposed on the rear side of the front mold base plate, and a front mold core disposed at the center of the rear side of the front mold template. The front side of the rear mold core is provided with a rear mold outer forming surface, the center of the rear mold outer forming surface is provided with a mold core mounting hole, the rear mold core is disposed in the mold core mounting hole, the front end of the rear mold core is provided with a rear mold inner forming surface, and a guide strip is provided on the rear mold connecting plate. The guide strip is provided with a snap-fit ​​forming strip that slides back and forth. The guide strips are arranged in pairs and parallel to each other. A guide step is provided on the opposite side of the guide strip. The guide steps on the two guide strips open forward in a figure-eight shape. The snap-fit ​​forming strip is provided with a guide groove that cooperates with the guide step. The guide groove is a dovetail groove. The rear template is provided with a pushing part that abuts the rear end of the snap-fit ​​forming strip. A boss for forming an inner snap hole is provided at the front end of the opposite side of the snap-fit ​​forming strip. The rear mold core is provided with an inner snap forming surface that cooperates with the boss. A pull-out rubber pillar is provided on the front side of the rear template. The front template is provided with a pull-out hole that cooperates with the pull-out rubber pillar when the mold is closed. A rear mold guide post is provided on the rear mold connecting plate. The rear template and the rear mold guide post are slidably engaged.

[0005] As a further improvement to this design, an ejector plate is slidably connected between the rear mold connecting plate and the rear mold base plate. The ejector plate is provided with an ejector body, which extends forward to the outer forming surface of the rear mold.

[0006] As a further improvement to this design, the rear mold base plate is provided with ejector pin guide posts, which are slidably engaged with the ejector pin plate. The front side of the ejector pin plate is provided with an ejector pin stop post, and the ejector pin plate is provided with an ejector pin reset post that penetrates forward through the rear mold plate. The front end of the ejector pin reset post is detachably mechanically connected to a collision block.

[0007] As a further improvement to this design, an ejector reset spring is fitted on the ejector reset post. The rear end of the ejector reset spring resists the front side of the ejector plate, and the front end of the ejector reset spring abuts the rear side of the rear mold plate. When the mold is closed, the ejector reset spring is in a freely extended state.

[0008] As a further improvement to this design, the pull-out rubber column and the rear template are detachably connected by bolts.

[0009] As a further improvement to this design, the rear mold core is provided with a forming avoidance groove to avoid the buckle forming strip, and the buckle forming strip fits into the forming avoidance groove.

[0010] As a further improvement to this design, the rear template also includes a detachably connected mold core fixing block, and the pushing part is a boss on the mold core fixing block.

[0011] The beneficial effects of this utility model are as follows: This utility model uses the cooperation of guide strip and snap-fit ​​forming strip to make the snap-fit ​​forming strip move forward with the rear mold core in the initial stage of demolding, while retracting inward, so as to realize the separation of the snap-fit ​​forming strip from the inner snap of the injection molded part. Even if the inner snap is set deeper, it can be demolded smoothly without damaging the injection molded part. The tight fit between the pull hole and the pull-out rubber column is used to pull the rear mold plate forward in the initial stage of demolding, and the structure is simple. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0014] Figure 2 This is a schematic cross-sectional view of the present invention.

[0015] Figure 3 This is a schematic diagram of the three-dimensional structure of the rear mold of this utility model.

[0016] Figure 4 This is a schematic diagram of the three-dimensional structure of the front mold of this utility model.

[0017] Figure 5 This is a three-dimensional structural diagram of the rear mold core and guide strip of this utility model.

[0018] Figure 6This is a three-dimensional structural diagram of the guide strip and the snap-fit ​​molding strip of this utility model.

[0019] Figure 7 This is a schematic diagram of the three-dimensional structure of the rear mold core of this utility model.

[0020] In the diagram: 1. Rear mold base plate; 2. Rear mold pad; 3. Rear mold connecting plate; 4. Rear mold plate; 40. Mold core fixing block; 41. Pushing part; 5. Front mold plate; 6. Front mold base plate; 7. Guide strip; 70. Guide step; 8. Snap-fit ​​forming strip; 80. Boss; 81. Guide groove; 9. Rear mold core; 90. Inner snap forming surface; 91. Forming clearance groove; 10. Ejector plate; 11. Ejector return spring; 12. Ejector guide post; 13. Ejector body; 14. Ejector stop post; 15. Rear mold outer forming surface; 16. Rear mold inner forming surface; 17. Collision block; 18. Pull-out rubber post; 19. Rear mold guide post; 20. Pull-out hole; 21. Rear mold core; 22. Front mold core; 23. Ejector return post; 24. Mold core mounting hole. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. Example

[0022] Please see Figure 1 , Figure 2 as well as Figure 3 This embodiment provides an injection mold for an internally recessed injection molded part, including a rear mold base plate 1, a rear mold pad 2 disposed on the front side of the rear mold base plate 1, a rear mold connecting plate 3 disposed on the front side of the rear mold pad 2, a rear mold template 4 disposed on the front side of the rear mold connecting plate 3, a rear mold core 21 disposed on the front side of the rear mold template 4, a rear mold core 9 disposed on the rear mold core 21, a front mold base plate 6, a front mold template 5 disposed on the rear side of the front mold base plate 6, and a front mold core 22 disposed at the center of the rear side of the front mold template 5. The front side of the rear mold core 21 is provided with a rear mold outer forming surface 15, and the center of the rear mold outer forming surface 15 is provided with a mold core mounting hole 24. The rear mold core 9 is disposed in the mold core mounting hole 24, and the front end of the rear mold core 9 is provided with a rear mold inner forming surface 16. The rear mold connecting plate 3 is provided with a guide strip 7, and the guide strip 7 is provided with a snap-fit ​​forming strip 8 that slides back and forth (see [link]). Figure 6 The guide strips 7 are arranged in pairs parallel to each other, and each guide strip 7 has a guide step 70 on its opposite side. The guide steps 70 on the two guide strips 7 open forward in a V-shape. The snap-fit ​​forming strip 8 has a guide groove 81 that mates with the guide step 70. The guide groove 81 is a dovetail groove (see [link to relevant documentation]). Figure 6The rear template 4 is provided with a pushing part 41 that abuts against the rear end of the snap-fit ​​forming strip 8. The front end of the snap-fit ​​forming strip 8 on the opposite side is provided with a boss 80 for forming an inner snap-fit ​​hole. The rear mold core 9 is provided with an inner snap-fit ​​forming surface 90 that mates with the boss 80. The front side of the rear template 4 is provided with a pull-out rubber column 18. The front template 5 is provided with a pull-out hole 20 that mates with the pull-out rubber column 18 when the mold is closed (see [link]). Figure 3 The rear mold connecting plate 3 is provided with a rear mold guide post 19, and the rear mold plate 4 is slidably engaged with the rear mold guide post 19.

[0023] The guide strip 7 and the snap-fit ​​forming strip 8 work together to make the snap-fit ​​forming strip 8 move forward with the rear mold core 21 in the initial stage of demolding, while retracting inward, so as to separate the snap-fit ​​forming strip 8 from the inner snap-fit ​​hole of the injection molded part. The deep inner snap-fit ​​hole can also be demolded smoothly without damaging the injection molded part. The pull hole 20 and the pull-out glue column 18 are tightly fitted to pull the rear mold plate 4 forward in the initial stage of demolding, which is simple in structure.

[0024] Please see Figure 2 To further facilitate the demolding of the injection molded parts, an ejector plate 10 is slidably connected between the rear mold connecting plate 3 and the rear mold base plate 1. The ejector plate 10 is provided with an ejector body 13, which extends forward to the outer forming surface 15 of the rear mold.

[0025] Please see Figure 2 The rear mold base plate 1 is provided with ejector pin guide post 12, which slides with the ejector pin plate 10. The front side of the ejector pin plate 10 is provided with ejector pin stop post 14, and the ejector pin plate 10 is provided with ejector pin reset post 23 that penetrates forward through the rear mold plate 4. The front end of the ejector pin reset post 23 is detachably mechanically connected to a collision block 17. The ejector pin guide post 12 and ejector pin stop post 14 are used to improve the ejection accuracy of the ejector pin, and the ejector pin reset post 23 is used to improve the reset accuracy of the ejector pin body 13 during mold closing.

[0026] To facilitate the smooth forward movement of the rear template 4, an ejector reset spring 11 is fitted on the ejector reset post 23. The rear end of the ejector reset spring 11 resists the front side of the ejector plate 10, and the front end of the ejector reset spring 11 abuts the rear side of the rear template 4. When the mold is closed, the ejector reset spring 11 is in a freely extended state.

[0027] Please see Figure 3 To facilitate the replacement of the pull-out rubber column 18, the pull-out rubber column 18 is detachably connected to the rear template 4 by bolts.

[0028] Please see Figure 7In order to facilitate the avoidance of the buckle forming strip 8 and to provide a certain stabilizing effect on the buckle forming strip 8, the rear mold core 9 is provided with a forming avoidance groove 91 to avoid the buckle forming strip 8, and the buckle forming strip 8 fits into the forming avoidance groove 91.

[0029] Please see Figure 2 To facilitate the installation of the guide strip 7, the rear template 4 also includes a detachably connected mold core fixing block 40, and the pushing part 41 is a boss 80 on the mold core fixing block 40.

[0030] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An injection mold for an internally knurled hole injection molded part, the injection mold comprising: The back mold base plate, the back mold cushion block arranged on the front side of the back mold base plate, the back mold connecting plate arranged on the front side of the back mold cushion block, the back mold plate arranged on the front side of the back mold connecting plate, the back mold core arranged on the back mold plate, the front mold base plate, the front mold plate arranged on the rear side of the front mold base plate, and the front mold core arranged on the rear side of the center of the front mold plate are provided with a back mold outer forming surface on the front side of the back mold core, a mold core mounting hole is arranged in the center of the back mold outer forming surface, the back mold core is arranged in the mold core mounting hole, a back mold inner forming surface is arranged on the front end of the back mold core, a guide strip is arranged on the back mold connecting plate, the guide strip is provided with a front and rear sliding buckle forming strip, the guide strip is arranged in pairs and in parallel, a guide step is arranged on the opposite side of the guide strip, the guide steps on the two guide strips are opened in a miter shape and forward, the buckle forming strip is provided with a guide sliding groove matched with the guide step, the guide sliding groove is a dovetail groove, a pushing part for stopping the rear end of the buckle forming strip is arranged on the back mold plate, a boss for forming an inner buckle hole is arranged on the front end of the opposite side of the buckle forming strip, and the back mold core is provided with an inner buckle forming surface matched with the boss; a pulling rubber column is arranged on the front side of the back mold plate, the front mold plate is provided with a pulling hole matched with the pulling rubber column when the mold is closed, a back mold guide column is arranged on the back mold connecting plate, and the back mold plate and the back mold guide column are in sliding cooperation.

2. A mold for injection molding an inner snap hole injection molded part according to claim 1, wherein, The back mold connecting plate and the back mold base plate are in sliding connection with a thimble plate, the thimble plate is provided with a thimble body, and the thimble body extends forward to the back mold outer forming surface.

3. A mold for injection molding an internally threaded part according to claim 2, wherein, The back mold base plate is provided with a thimble guide column, the thimble guide column is in sliding cooperation with the thimble plate, the front side of the thimble plate is provided with a thimble stop column, the thimble plate is provided with a thimble reset column penetrating through the back mold plate forward, and a collision block is detachably mechanically connected to the front end of the thimble reset column.

4. A mold for injection molding an internally threaded part according to claim 3, wherein, A thimble reset spring is sleeved on the thimble reset column, the rear end of the thimble reset spring abuts against the front side of the thimble plate, the front end of the thimble reset spring abuts against the rear side of the back mold plate, and in the closed state of the mold, the thimble reset spring is in a free stretching state.

5. The injection mold for an internally knitted pin injection molded part of claim 1, wherein, The pulling rubber column and the back mold plate are detachably connected through bolts.

6. A mold for injection molding an internally threaded part as defined in claim 1, wherein, The back mold core is provided with a forming avoidance groove avoiding the buckle forming strip, and the buckle forming strip is attached to the forming avoidance groove.

7. A mold for injection molding an internally threaded part as defined in claim 1, wherein, The back mold plate further comprises a detachably connected mold core fixing block, and the pushing part is a boss on the mold core fixing block.

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