Dual-shot mold and injection molding method

Abstract

This application relates to the field of injection molding technology, specifically providing a two-shot mold and injection molding method. The two-shot mold includes a male mold base and a slider. The mold base has a male forming part and a mating hole. The slider is slidably disposed on the mold base to move closer to or further away from the male forming part. When the slider is close to the male forming part, a first female mold is close to the male forming part and forms a first mold cavity, and a second female mold is close to the male forming part and forms a second mold cavity. A push-push structure is disposed on the slider. When the first female mold is close to the male forming part, it pushes against the input end of the push-push structure, causing its output end to be inserted into the mating hole. When the first female mold is away from the male forming part and the second female mold is close to the male forming part, the output end of the push-push structure remains in the mating hole. When the second female mold is away from the male forming part, the output end of the push-push structure moves out of the mating hole. This helps to ensure product integrity and improve yield.

Claims

1. A double-shot mold, comprising: A male mold includes a mold base and a slider. The mold base has a male forming part and a mating hole. The slider is slidably disposed on the mold base to move closer to or further away from the male forming part. A first female mold and a second female mold are provided. The male mold moves between two injection positions to mate with the first female mold and the second female mold, respectively. When the slider is close to the male forming part, the first female mold is close to the male forming part and forms a first mold cavity, and the second female mold is close to the male forming part and forms a second mold cavity. A push-push structure is provided on the slider. When the first female mold approaches the male molding part, it pushes against the input end of the push-push structure and inserts the output end of the push-push structure into the mating hole. When the first female mold moves away from the male molding part and the second female mold approaches the male molding part, the output end of the push-push structure remains in the mating hole to prevent the slider from moving away from the male molding part due to the inertia generated by the movement of the male mold. When the second female mold moves away from the male molding part, the output end of the push-push structure moves out of the mating hole.

2. The double-shot mold as described in claim 1, wherein, The first female mold includes a first mold body and a first push member disposed on the first mold body. The slider has a sliding body and a push engagement part disposed on the sliding body and cooperating with the first push member. During the process of the first female mold approaching the mold base, the first push member first cooperates with the push engagement part to push the slider closer to the male forming part. The first mold body then cooperates with the input end of the PUSH-PUSH structure to drive the output end of the PUSH-PUSH structure to be inserted into a mating hole.

3. The double-shot mold as described in claim 2, wherein, The push-fitting part includes a first sliding surface and a second sliding surface disposed at one end of the sliding body. The first sliding surface is inclined towards the male forming part along the direction close to the first female mold. The second sliding surface is connected to the first sliding surface and is perpendicular to the sliding direction of the slider. When the first female mold approaches the male forming part, the first push-fitting member engages with the first sliding surface and the second sliding surface in sequence, so that the slider first approaches the male forming part and then remains stationary.

4. The double-shot mold as described in claim 3, wherein, The first pusher includes a pusher body connected to the first mold body and a pusher portion disposed on the pusher body. The lower end of the pusher portion is an arc-shaped surface and is located at one end of the first pusher facing the mold base, and is in line contact or surface contact with the pusher mating portion.

5. The double-shot mold as described in claim 4, wherein, The mold base has a sliding groove, and the slider is slidably disposed in the sliding groove. The push body has a pressing inclined surface parallel to the first sliding surface. The first mold body cooperates with the input end of the PUSH-PUSH structure so that the output end of the PUSH-PUSH structure is inserted into a mating hole. At the same time, the pressing inclined surface presses against the first sliding surface so as to drive the sliding body to abut against the bottom of the sliding groove.

6. The double-shot mold as described in claim 1, wherein, The second female mold includes a second mold body and a toggle member disposed on the second mold body. The toggle member is inclined away from the male forming part in a direction close to the mold base. The slider has a toggle channel that cooperates with the toggle member. A toggle mating member is disposed on the slider and partially located in the toggle channel. The toggle member located in the toggle channel slides in cooperation with the toggle mating member so that when the toggle member moves away from the male mold, it drives the toggle mating member away from the male forming part.

7. The double-shot mold as described in claim 6, wherein, The maximum size of the output end of the PUSH-PUSH structure inserted into a mating hole is the first size. When the second female mold moves away from the male mold, and the distance between the second female mold and the male mold is the second size, the actuating member abuts against the actuating mating member. The first size is less than or equal to the second size.

8. The double-shot mold as described in claim 6, wherein, The actuating engagement component includes an actuating pin and an actuating elastic member. The slider has an actuating hole communicating with the actuating channel. The extension direction of the actuating hole is perpendicular to the sliding direction of the slider. The actuating pin is located in the actuating hole. The actuating pin moves relative to the slider to retract into the actuating hole or partially into the actuating channel. The actuating elastic member applies an elastic force to the actuating pin to move it into the actuating channel. The actuating member is inclined away from the male forming part in the direction close to the mold base. The end of the actuating member near the mold base has a first actuating surface. The first actuating surface is away from the actuating pin in the direction close to the mold base. A second actuating surface is formed on the side of the actuating member away from the male forming part.

9. The double-shot mold as described in claim 8, wherein, The slider is equipped with two actuating mating parts, and the two actuating pins are arranged at intervals and move closer to each other under the action of the two actuating elastic elements; and / or, the actuating mating part also includes an actuating seat, which is fixedly connected to the slider and seals the actuating hole. The actuating elastic element is a spring, which is disposed in the actuating hole, with one end abutting against the actuating pin and the other end abutting against the actuating seat.

10. The double-shot mold as claimed in claim 1, wherein, The mold also includes a mold ejector. The mold base has a mold ejection hole that communicates with the first mold cavity. The mold ejector is inserted into the mold ejection hole and moves between a mold forming position and a mold ejection position. When it moves from the mold forming position to the mold ejection position, one end of the mold ejector moves into the interior of the first mold cavity.

11. The double-shot mold as claimed in claim 10, wherein, The mold includes a support base and a push plate. The mold base is disposed on the support base, the push plate is slidably disposed on the support base, and the other end of the mold ejector is connected to the push plate.

12. A double-shot mold as described in any one of claims 1 to 11, wherein, The double-shot mold also includes a rotating component. The male mold is located on the rotating component and rotates synchronously with the rotating component, passing through two injection positions. The sliding direction of the slider is perpendicular to the axial direction of the rotating component.

13. The double-shot mold as described in claim 12, wherein, The axis of the rotating component extends horizontally. When the male mold mates with the first female mold, the sliding direction of the slider extends vertically. The output end of the PUSH-PUSH structure remains in the mating hole to prevent the slider from moving away from the male forming part.

14. The double-shot mold as claimed in claim 12, wherein, The double-shot mold has two male molds, which are located on both sides of the axis of the rotating component and rotate synchronously with the rotating component, so that when one of the male molds corresponds to the first female mold, the other male mold corresponds to the second female mold.

15. The double-shot mold as claimed in claim 14, wherein, Each male mold includes at least two sliders, both of which are slidably disposed on the mold base and simultaneously move closer to or further away from the male forming part during the sliding process. When the first female mold and the second female mold are respectively facing the two male molds, the sliding direction of all the sliders extends vertically. The number of PUSH-PUSH structures is the same as the number of sliders, and they are arranged in a one-to-one correspondence.

16. A double-shot mold as described in any one of claims 1 to 11, wherein, The mold base has a sliding groove, the slider has a sliding body and two sliding parts disposed on the sliding body, the two sliding parts are arranged at intervals on both sides of the sliding body along a limiting direction perpendicular to the sliding direction of the slider, and two sliding mating parts are disposed on the mold base, each sliding mating part having a pressing surface, the two pressing surfaces corresponding one-to-one with the two sliding parts, and pressing against the side of the sliding part away from the bottom of the sliding groove.

17. A double-shot mold as described in any one of claims 1 to 11, wherein, The push-push structure includes a fixing frame, a pressing member, a locking member, a plug-in member, and a thrust elastic member. The fixing frame has a mounting hole, and the side wall of the mounting hole has several slide rails. The outer periphery of the pressing member has several first slide grooves that correspond to the slide rails one by one. The end of the pressing member facing the locking member has a driving tooth, and the end of the locking member facing the pressing member has a driven tooth. The outer periphery of the locking member has several second slide grooves that correspond to the slide rails one by one. The plug-in member is located at the end of the locking member away from the pressing member. The thrust elastic member applies an elastic force to the plug-in member to push the plug-in member closer to the locking member.

18. An injection molding method applied to a two-shot mold as described in any one of claims 1 to 17, wherein, The process includes the following steps: A male mold moves to a position corresponding to a first female mold; the first female mold approaches a male forming part of the male mold and pushes against the input end of a PUSH-PUSH structure so that the output end of the PUSH-PUSH structure is inserted into a mating hole of a mold base; a first raw material is injected into a first mold cavity to complete the first injection molding process; after the first female mold moves away from the male forming part, a second female mold approaches the male forming part, during which the output end of the PUSH-PUSH structure remains in the mating hole; a second raw material is injected into the second mold cavity to complete the second injection molding process; when the second female mold moves away from the male forming part, the output end of the PUSH-PUSH structure is driven to move out of the mating hole.

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