Injection mold and two-shot molding method

Abstract

This invention belongs to the field of two-shot molding technology, and provides an injection mold and a two-shot molding method. In the injection mold, a first male mold base has a first male receiving portion; a first mold core is disposed in the first male receiving portion and has a first molding groove; a first female mold base has a first female receiving portion; a second mold core has a second molding groove; a second male mold base has a second male receiving portion; the second mold core is detachably connected to either the first female receiving portion or the second male receiving portion, and the second female mold base has a second female receiving portion; a third mold core has a third molding groove and is disposed in the second female receiving portion; when the first female mold base and the first male mold base mate, the first and second molding grooves form a first injection cavity; when the second female mold base and the second male mold base mate, the second and third molding grooves form a second injection cavity. This configuration saves costs and improves production efficiency and yield.

Claims

1. An injection mold, characterized in that it comprises: A first male mold base, the first male mold base having a first male receiving portion; A first mold core disposed in the first male receiving portion, the first mold core having a first molding groove; a first female mold base having a first female receiving portion; a second mold core having a second molding groove; a second male mold base having a second male receiving portion; the second mold core is detachably connected to the first female receiving portion or the second male receiving portion; a second female mold base having a second female receiving portion; a third mold core having a third molding groove and disposed in the second female receiving portion; when the first female mold base and the first male mold base are engaged, the first molding groove and the second molding groove form a first injection cavity; when the second female mold base and the second male mold base are engaged, the second molding groove and the third molding groove form a second injection cavity.

2. The injection mold as described in claim 1, wherein, The injection mold also includes a connecting assembly, which includes a connecting seat and a connecting member. The first female mold base and the second male mold base are each equipped with at least one of the connecting seats. The connecting member is movably connected to the connecting seat and has a connecting position and a clearance position. The connecting member is configured to connect the second mold core and the first female mold base or connect the second mold core and the second male mold base when in the connecting position.

3. The injection mold as described in claim 2, wherein, There are two connectors, each corresponding to one of the two connecting seats, and the connector in the clearance position is connected to the corresponding connecting seat; or, there is only one connector, and one of the connecting seats on the first female mold base and the connecting seat on the second male mold base is connected to the connector.

4. The injection mold as described in claim 2, wherein, The connector has a connection channel, the connector is located in the connection channel and moves back and forth along the extension direction of the connection channel, and moves between the connection position and the avoidance position.

5. The injection mold as described in claim 4, wherein, The second mold core has a plug-in groove, and the connector is a rod-shaped structure. The connector located at the connection position is inserted into the plug-in groove.

6. The injection mold as described in claim 5, wherein, The insertion slot includes a limiting portion and a guide portion that are connected to each other. Along the extension direction of the insertion slot, the diameter of the limiting portion remains constant, while along the direction away from the limiting portion, the diameter of the guide portion gradually increases; and / or, the end of the connector facing the insertion slot has a chamfer.

7. The injection mold as described in claim 4, wherein, The connection assembly also includes a locking member disposed on the connection seat, and the output end of the locking member reciprocates in a direction perpendicular to the axis of the connection channel and moves between a locked position and an unlocked position. The connection member has a locking groove, and when it is in the locked position, the output end of the locking member is inserted into the locking groove.

8. The injection mold as described in claim 7, wherein, The connector has two locking grooves along its own axis. When the output end of the locking member is inserted into one of the locking grooves, the connector is in the connection position. When the output end of the locking member is inserted into the other locking groove, the connector is in the clearance position.

9. The injection mold as described in claim 7, wherein, The locking element includes a locking seat, an elastic element, and a locking ball. The connecting seat has a locking channel communicating with the connecting channel. The locking seat is located in the locking channel. The locking ball forms the output end of the locking element and is located in the locking channel. The elastic element is located in the locking channel, with one end abutting against the locking ball and the other end abutting against the locking seat.

10. The injection mold as described in claim 7, wherein, The connecting channel has a first guide plane, and the connector has a second guide plane, the first guide plane and the second guide plane being parallel; and / or, the cross-sectional profile of the connecting channel is non-circular, and the cross-sectional profile of the connector is adapted to the connecting channel.

11. The injection mold as described in claim 7, wherein, The depth of the locking groove is less than the radius of the locking groove.

12. The injection mold as described in claim 2, wherein, The first female mold base is equipped with two connecting seats, which are arranged at intervals along the length of the first female mold base.

13. The injection mold as claimed in claim 12, wherein, Along the width direction of the first female mold base, the two connecting seats are staggered.

14. The injection mold as described in any one of claims 2 to 13, wherein, The connecting assembly also includes a handle having a mating portion and an operating portion, the mating portion being connected to the connector, and the outer diameter of the operating portion being larger than the outer diameter of the mating portion.

15. The injection mold as claimed in claim 14, wherein, The first female receiving portion is a groove, and the first female mold base has a first clearance groove communicating with the first female receiving portion. At least the operating portion of the handle is located on the outside of the first female mold base.

16. The injection mold as described in any one of claims 1 to 13, wherein, The first female receiving portion is a groove, and the injection mold also includes a handle. The first female mold base has a second clearance groove communicating with the first female receiving portion. The handle is located on the second mold core and at least partially passes through the second clearance groove and is located on the outside of the second female mold base.

17. The injection mold as claimed in claim 16, wherein, The handle has two parts, wherein the two handles are spaced apart at both ends of the second mold core along the length direction of the first female mold base; and / or, the two handles are spaced apart along the width direction of the first female mold base.

18. A two-shot molding method, applied to the injection mold described in any one of claims 1 to 17, characterized in that it comprises the following steps: installing a first mold core into a first male receiving portion of a first male mold base; installing a second mold core into a first female receiving portion of a first female mold base; placing the product to be packaged in a first molding groove of the first mold core; the first female mold base and the first male mold base cooperate, the first molding groove and a second molding groove of the second mold core forming a first injection cavity, the product to be packaged being located in the first injection cavity, the product to be packaged and the second mold core forming a first outer shell cavity; injecting molding into the first outer shell cavity to form a first semi-finished product; removing the second mold core from the first female mold base, and installing it, along with the product to be packaged and the first semi-finished product, into a second male mold base; When the second female mold base and the second male mold base are engaged, a third molding groove of a third mold core on the second female mold base and the second molding groove form a second injection cavity. The product to be wrapped, the first semi-finished product, and the third mold core form a second outer shell cavity. A second semi-finished product is formed by injection molding into the second outer shell cavity. The second semi-finished product and the first semi-finished product form an outer shell and wrap the product to be wrapped to form a finished product. The finished product is removed. The second mold core is removed from the second male mold base and installed on the first female mold base for secondary injection molding.

Images