Bidirectional strong demolding injection mold and demolding method

Abstract

The present application relates to a bidirectional strong unlocking injection mold and a demolding method, the mold comprises a front mold core, a rear mold core and a lower mold plate, the lower mold plate is provided with an insert needle and an elastic assembly, the insert needle comprises a needle body, the upper end of the needle body is provided with a first support piece and a second support piece, the first support piece and the second support piece are connected through an elastic piece; the upper end of the first support piece and the upper end of the second support piece are connected through a deformable circular metal sheet; the upper end of the needle body is provided with a third support piece, a rotating shaft is rotatably arranged in the needle body, and the rotating shaft is coaxially connected with the third support piece; the elastic assembly triggers the rotating shaft to rotate 90 degrees and triggers the needle body to move back in the direction away from the front mold core when the mold is opened; not only the insert needle can be removed to avoid the position interference influence on the demolding of the bidirectional lock, but also the demolding force is applied to the lock in the inward direction, so that the subsequent lock demolding is easier, and the success rate of the bidirectional lock position demolding can be improved.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and more specifically, to a bidirectional strong release injection mold and a release method. Background Technology

[0002] Injection molds are commonly used for processing plastic products. When processing products with a two-way strong release lock structure, insert pins are usually installed on the bottom side of the rear mold core to ensure smooth molding. The insert pins are inserted into the middle hole of the two-way lock. When the product is demolded, the outer plastic part of the lock will be blocked by the insert pin and will not be able to produce inward bending elastic deformation, resulting in damage to the lock, such as dragging, scratching or breakage. At the same time, the existing direct one-time demolding method is also a major factor causing low product yield. A more reasonable mold structure is needed to improve the above problems, so as to ensure product quality and improve product yield. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a bidirectional strong release injection mold and a method for demolding the bidirectional strong release injection mold, in view of the above-mentioned defects of the prior art.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A bidirectional strong-release injection mold is constructed, comprising a front mold core, a rear mold core, and a lower mold plate. The front mold core has a front mold cavity, and the rear mold core has a rear mold cavity. The lower mold plate is provided with a pin and an elastic component. The rear mold core has a first opening for the pin to extend into the rear mold cavity. The pin includes a pin body connected to the elastic component. The upper end of the pin body is provided with a longitudinal first support plate and a second support plate, which are spaced apart and connected by an elastic component. The upper ends of the first support plate and the upper ends of the second support plate are connected by a deformable circular metal sheet. The upper end of the pin body is provided with a third support plate located between the first and second support plates to separate them. A rotating shaft rotatably passes through the pin body and is coaxially connected to the third support plate. When the mold is opened, the elastic component triggers the rotating shaft to rotate 90 degrees and triggers the pin body to spring back in a direction away from the front mold core.

[0006] The bidirectional strong unlocking injection mold of the present invention includes an elastic component comprising an elastic plate, a receiving groove for accommodating the elastic plate on the lower surface of the lower template, and an upper surface of the elastic plate connected to the inner top of the receiving groove by multiple first springs; a second opening communicating with the first opening is provided in the inner top of the receiving groove; and the lower end of the needle body passes through the second opening and is connected to the elastic plate.

[0007] The bidirectional strong unlocking injection mold of the present invention includes a third opening, which is a through hole, on the lower surface of the elastic plate, and a second spring is disposed in the third opening; a connecting piece is fixedly disposed at the lower end of the second spring, and the connecting piece is damped and rotatably connected to the rotating shaft; the second spring is sleeved on the rotating shaft; a threaded ring with internal threads is disposed in the receiving groove, and an external thread matching the internal thread is disposed on the outer surface of the rotating shaft.

[0008] The bidirectional strong unlocking injection mold of the present invention, wherein the threaded ring is disposed at the upper opening of the third opening; the upper end of the second spring is located below the threaded ring, and the upper end of the second spring is fixedly connected to the inner wall of the third opening.

[0009] The bidirectional strong unlocking injection mold of the present invention includes a limiting step at the opening of the receiving groove for limiting the elastic plate.

[0010] The bidirectional strong unlocking injection mold of the present invention includes a plurality of positioning protrusions surrounding the elastic plate on the inner wall of the limiting step, and a plurality of sliding limiting grooves corresponding one-to-one with the positioning protrusions on the outer surface of the elastic plate.

[0011] The bidirectional strong unlocking injection mold of the present invention has the first support plate and the second support plate having arc-shaped cross sections, the third support plate having an elliptical cross section, and a gap between the upper end of the third support plate and the circular metal sheet.

[0012] A method for demolding a bidirectional strong-release injection mold, applied to the bidirectional strong-release injection mold as described above, includes the following steps:

[0013] When the mold is closed, the front mold cavity on the front mold core and the rear mold cavity on the rear mold core surround each other to form the injection molding cavity of the product. The third support plate expands the first support plate and the second support plate to the maximum distance position, the elastic element is stretched, the circular metal sheet is fully unfolded, and the circular metal sheet, the first support plate and the second support plate form an n-shaped structure.

[0014] When the mold opens, the elastic component on the lower mold plate triggers the rotating shaft to rotate 90 degrees and triggers the needle body to rebound in the direction away from the front mold core. The rotating shaft drives the third support plate to rotate 90 degrees to release the support of the first and second support plates. The circular metal sheet forms wrinkles. The elastic component resets and pulls the first and second support plates to move towards the middle, providing an inward lateral demolding force to the latches on both sides. The downward movement of the needle body drives the first support plate, the second support plate, and the circular metal sheet to disengage.

[0015] The beneficial effects of this invention are as follows: When the mold is closed, the front mold cavity on the front mold core and the rear mold cavity on the rear mold core enclose each other to form the injection molding cavity of the product. The third support plate expands the first support plate and the second support plate to the maximum distance position, the elastic element is stretched, the circular metal sheet is fully unfolded, and the circular metal sheet, the first support plate and the second support plate form an n-shaped structure. This n-shaped structure and the inner wall of the rear mold cavity enclose each other to form a locking molding groove and an injection groove for injecting glue into the locking molding groove. When the mold is opened, the elastic component on the lower mold plate triggers the rotating shaft to rotate 90 degrees and triggers the needle body to rebound in the direction away from the front mold core. The rotating shaft drives the third support plate to rotate 90 degrees to release the support of the first support plate and the second support plate. The circular metal sheet forms wrinkles. The elastic element resets and pulls the first support plate and the second support plate to move towards the middle, providing an inward lateral demolding force for the locking on both sides. The downward movement of the needle body drives the first support plate, the second support plate and the circular metal sheet to be disengaged.

[0016] When using the injection mold of this application, the insert pin can be removed during mold opening to avoid positional interference with the demolding of the bidirectional locking buckle. At the same time, the insert pin can preferentially apply an inward demolding force to the locking buckle during the demolding process, making the subsequent demolding of the locking buckle easier and improving the success rate of demolding of the bidirectional locking buckle. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0018] Figure 1 This is a bidirectional strong unlocking injection mold according to a preferred embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0020] A preferred embodiment of the present invention is a bidirectional strong-release injection mold, such as... Figure 1 As shown, the device includes a front mold core 1, a rear mold core 2, and a lower mold plate 3. The front mold core 1 has a front mold cavity 10, the rear mold core 2 has a rear mold cavity 20, and the lower mold plate 3 has a pin 4 and an elastic component. The rear mold core 2 has a first opening 21 for the pin 4 to extend into the rear mold cavity 20. The pin 4 includes a pin body 40 connected to the elastic component. The upper end of the pin body 40 has a longitudinal first support plate 41 and a second support plate 42. There is a gap between the first support plate 41 and the second support plate 42, and they are connected by an elastic element 43. The upper ends of the first support plate 41 and the second support plate 42 are connected by a deformable circular metal sheet 44; the upper end of the needle body 40 is provided with a third support plate 45 located between the first support plate 41 and the second support plate 42 to open up the first support plate 41 and the second support plate 42; a rotating shaft 46 is rotatably inserted inside the needle body 40, and the rotating shaft 46 is coaxially connected with the third support plate 45; when the mold is opened, the elastic component triggers the rotating shaft 46 to rotate 90 degrees and triggers the needle body 40 to spring back in the direction away from the front mold core 1;

[0021] When the mold is closed, the front mold cavity 10 on the front mold core 1 and the rear mold cavity 20 on the rear mold core 2 enclose each other to form the injection molding cavity of the product. The third support plate 45 expands the first support plate 41 and the second support plate 42 to the maximum distance position. The elastic component is stretched. The locking molding slots 60 on both sides of the first support plate 41 and the second support plate 42 are formed. At the same time, the circular metal sheet 44 is fully unfolded. The circular metal sheet 44, the first support plate 41 and the second support plate 42 form an n-shaped structure. The n-shaped structure and the inner wall of the rear mold cavity 20 enclose each other to form the locking molding slot 60 and the injection groove 61 for injecting glue into the locking molding slot 60.

[0022] When the mold opens, the elastic component on the lower mold plate triggers the rotating shaft to rotate 90 degrees and triggers the needle body 40 to rebound in the direction away from the front mold core 1. The rotating shaft drives the third support plate 45 to rotate 90 degrees to release the support of the first support plate 41 and the second support plate 42. The circular metal sheet 44 forms wrinkles. The elastic element 43 resets and pulls the first support plate 41 and the second support plate 42 to move towards the middle, providing an inward lateral demolding force to the latches on both sides. The downward movement of the needle body 40 drives the first support plate 41, the second support plate 42 and the circular metal sheet 44 to disengage.

[0023] When using the injection mold of this application, the insert pin can be removed during mold opening to avoid positional interference with the demolding of the bidirectional locking buckle. At the same time, the insert pin can preferentially apply an inward demolding force to the locking buckle during the demolding process, making the subsequent demolding of the locking buckle easier and improving the success rate of demolding of the bidirectional locking buckle.

[0024] Preferably, the elastic component includes an elastic plate 50, and the lower surface of the lower template 3 is provided with a receiving groove for accommodating the elastic plate 50. The upper surface of the elastic plate 50 is connected to the inner top of the receiving groove by multiple first springs 51. The inner top of the receiving groove is provided with a second opening 300 that communicates with the first opening 21. The lower end of the needle body 40 passes through the second opening 300 and is connected to the elastic plate 50. The lower surface of the elastic plate 50 is provided with a third opening 500 that is a through hole. A second spring 501 is provided in the third opening 500. A connecting piece 502 is fixedly provided at the lower end of the second spring 501. The connecting piece 502 is damped and rotatably connected to the rotating shaft 46. The second spring 501 is sleeved on the rotating shaft 46. A threaded ring 301 with internal threads is provided in the receiving groove 30, and the outer surface of the rotating shaft 46 is provided with an external thread that matches the internal thread.

[0025] During mold closing, the ejector plate 7 below the lower mold plate 3 will squeeze the elastic plate 50, causing it to enter the receiving groove, and at the same time squeeze the connecting piece 502, causing it to enter the third opening 500. The rise of the elastic plate 50 will drive the needle body 40 to rise, and the rise of the connecting piece 502 will drive the rotating shaft 46 to rise. Relying on the cooperation between the threaded ring 301 and the external thread on the rotating shaft 46, the rotating shaft 46 will rotate 90 degrees, thereby driving the third support piece 45 to rotate 90 degrees, opening up the first support piece 41 and the second support piece 42, thereby causing the circular metal sheet 44 to unfold and the elastic element 43 to be stretched.

[0026] Conversely, during mold opening, the ejector plate 7 first detaches from the lower template 3, and the first spring 51 and the second spring 501 both reset. The reset of the connecting piece 502 will drive the rotating shaft 46 to rotate, which in turn will drive the third support piece 45 to rotate. This will cause the first support piece 41 and the second support piece 42 to reset under the elastic action of the elastic element 43. The reset of the elastic plate 43 will then drive the pin body 40 to move down and disengage from the locking part, ultimately forming the effect of the initial demolding of the locking part. This makes the subsequent demolding of the locking part easier and can improve the success rate of demolding of the bidirectional locking part.

[0027] Preferably, the threaded ring 301 is disposed at the upper opening of the third opening 500; the upper end of the second spring 501 is located below the threaded ring 301, and the upper end of the second spring 501 is fixedly connected to the inner wall of the third opening 500; a limiting step 302 for limiting the elastic plate 50 is provided at the opening of the receiving groove; a plurality of positioning protrusions 303 surrounding the elastic plate 50 are provided on the inner wall of the limiting step 302, and a plurality of sliding limiting grooves 503 corresponding one-to-one with the positioning protrusions 303 are provided on the outer surface of the elastic plate 50; this structure can ensure reliability, and at the same time, the elastic plate 50 is limited and prevented from falling off by the cooperation of the positioning protrusions 303 and the sliding limiting grooves 503.

[0028] Preferably, the cross-sections of the first support plate 41 and the second support plate 42 are both arc-shaped, and the cross-section of the third support plate 45 is elliptical. There is a gap between the upper end of the third support plate 45 and the circular metal sheet 44. This structural design is a better approach. Of course, simple alternatives to other conventional structural forms are not excluded.

[0029] A method for demolding a bidirectional strong-release injection mold, applied to the bidirectional strong-release injection mold as described above, includes the following steps:

[0030] When the mold is closed, the front mold cavity on the front mold core and the rear mold cavity on the rear mold core surround each other to form the injection molding cavity of the product. The third support plate expands the first support plate and the second support plate to the maximum distance position, the elastic element is stretched, the circular metal sheet is fully unfolded, and the circular metal sheet, the first support plate and the second support plate form an n-shaped structure.

[0031] When the mold opens, the elastic component on the lower mold plate triggers the rotating shaft to rotate 90 degrees and triggers the needle body to spring back in the direction away from the front mold core. The rotating shaft drives the third support plate to rotate 90 degrees to release the support of the first and second support plates. The circular metal sheet forms wrinkles. The elastic component resets and pulls the first and second support plates to move towards the middle, providing an inward lateral demolding force to the latches on both sides. The downward movement of the needle body drives the first support plate, the second support plate, and the circular metal sheet to disengage.

[0032] By applying the injection molding method of this application, not only can the insert pin be removed during mold opening to avoid positional interference with the demolding of the bidirectional lock, but the insert pin can also preferentially apply an inward demolding force to the lock during the demolding process, making subsequent demolding of the lock easier and improving the success rate of demolding of the bidirectional lock position.

[0033] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A bidirectional strong-release injection mold, comprising a front mold core, a rear mold core, and a lower mold plate, wherein the front mold core is provided with a front mold cavity, and the rear mold core is provided with a rear mold cavity, characterized in that, The lower mold plate is provided with a pin and an elastic component, and the rear mold core is provided with a first opening for the pin to extend into the rear mold cavity; the pin includes a pin body connected to the elastic component, and the upper end of the pin body is provided with a longitudinal first support plate and a second support plate, the first support plate and the second support plate are spaced apart and connected by an elastic element; the upper ends of the first support plate and the upper ends of the second support plate are connected by a deformable circular metal sheet; the upper end of the pin body is provided with a third support plate located between the first support plate and the second support plate to separate the first support plate and the second support plate, and a rotating shaft is rotatably passed through the pin body, the rotating shaft being coaxially connected to the third support plate; when the mold is opened, the elastic component triggers the rotating shaft to rotate 90 degrees and triggers the pin body to spring back in the direction away from the front mold core.

2. The bidirectional strong unlocking injection mold according to claim 1, characterized in that, The elastic component includes an elastic plate. The lower surface of the lower template is provided with a receiving groove for accommodating the elastic plate. The upper surface of the elastic plate is connected to the inner top of the receiving groove by multiple first springs. The inner top of the receiving groove is provided with a second opening that communicates with the first opening. The lower end of the needle body passes through the second opening and is connected to the elastic plate.

3. The bidirectional strong unlocking injection mold according to claim 2, characterized in that, The lower surface of the elastic plate is provided with a third opening that is a through hole, and a second spring is provided in the third opening; a connecting piece is fixedly provided at the lower end of the second spring, and the connecting piece is damped and rotatably connected to the rotating shaft, and the second spring is sleeved on the rotating shaft; a threaded ring with internal threads is provided in the receiving groove, and an external thread matching the internal thread is provided on the outer surface of the rotating shaft.

4. The bidirectional strong unlocking injection mold according to claim 3, characterized in that, The threaded ring is disposed at the upper opening of the third opening; the upper end of the second spring is located below the threaded ring, and the upper end of the second spring is fixedly connected to the inner wall of the third opening.

5. The bidirectional strong unlocking injection mold according to claim 2, characterized in that, The opening of the receiving groove is provided with a limiting step to limit the movement of the elastic plate.

6. The bidirectional strong unlocking injection mold according to claim 5, characterized in that, The inner wall of the limiting step is provided with a plurality of positioning protrusions surrounding the elastic plate, and the outer surface of the elastic plate is provided with a plurality of sliding limiting grooves corresponding one-to-one with the positioning protrusions.

7. The bidirectional strong unlocking injection mold according to claim 1, characterized in that, The first and second support plates have arc-shaped cross-sections, while the third support plate has an elliptical cross-section. There is a gap between the upper end of the third support plate and the circular metal sheet.

8. A method for demolding a bidirectional strong-release injection mold, applied to the bidirectional strong-release injection mold as described in any one of claims 1-7, characterized in that, Includes the following steps: When the mold is closed, the front mold cavity on the front mold core and the rear mold cavity on the rear mold core surround each other to form the injection molding cavity of the product. The third support plate expands the first support plate and the second support plate to the maximum distance position, the elastic element is stretched, the circular metal sheet is fully unfolded, and the circular metal sheet, the first support plate and the second support plate form an n-shaped structure. When the mold opens, the elastic component on the lower mold plate triggers the rotating shaft to rotate 90 degrees and triggers the pin body to rebound in the direction away from the front mold core. The rotating shaft drives the third support plate to rotate 90 degrees to release the support of the first and second support plates. The circular metal sheet forms wrinkles. The elastic element resets and pulls the first and second support plates to move towards the middle, providing an inward lateral demolding force to the latches on both sides. As the needle moves downward, it causes the first support plate, the second support plate, and the circular metal sheet to come out.

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