Double-color mold structure for reducing exhaust flash

Abstract

The utility model relates to the technical field of injection molds, in particular to a double-color mold structure for reducing exhaust flash, which comprises a fixed mold and a movable mold matched with the fixed mold, the fixed mold comprises a primary fixed mold and a secondary fixed mold, the primary fixed mold is used for injection molding of a first color sizing material, and the secondary fixed mold is used for injection molding of a second color sizing material. A primary forming exhaust groove is formed in a parting surface, matched with the movable mold, of the primary fixed mold; and the primary forming exhaust groove is formed in the direction close to the inner side of a primary cavity formed by the movable mold and the primary fixed mold and is communicated with the primary cavity. According to the utility model, exhaust flashes during injection molding of the double-color mold can be reduced, and the quality of injection-molded products is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a double-color mold structure for reducing exhaust flash. Background Art

[0002] A two-color mold is a mold used to inject two plastic materials on the same two-color injection molding machine. It includes a primary fixed mold, a secondary fixed mold, and a movable mold. It is molded in two times and ejected in one time. A typical two-color mold is a rotary two-color mold. When working, the movable mold in the rotary two-color mold is first molded with the primary fixed mold and the first plastic material is poured out. After the pouring is completed, the movable mold is separated from the primary fixed mold, and the first plastic material remains on the movable mold. The movable mold rotates 180 degrees with the first plastic material and then molds with the secondary fixed mold, and pours out the second plastic material to obtain an injection molded product containing two plastic materials.

[0003] The two-color mold in the prior art still has the following shortcomings when in use: the two-color mold needs to go through two mold closing and two mold opening during injection molding to achieve separate injection molding of two plastic materials, and both injection moldings will produce exhaust flash on the parting surface of the movable mold and the fixed mold, thereby affecting the quality of the injection molded product. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a two-color mold structure for reducing exhaust flash, aiming to reduce exhaust flash during two-color mold injection molding and improve the quality of injection molded products. The specific technical solution is as follows:

[0005] A two-color mold structure for reducing exhaust flash includes a fixed mold and a movable mold matched with the fixed mold, the fixed mold includes a primary fixed mold for injecting a first color rubber material and a secondary fixed mold for injecting a second color rubber material, a primary molding exhaust groove is arranged on the parting surface matched with the movable mold on the primary fixed mold, the primary molding exhaust groove is opened in the direction of the inner side of a primary cavity formed by the movable mold and the primary fixed mold and is connected with the primary cavity.

[0006] Preferably, the first color rubber material is hard plastic, and the second color rubber material is soft plastic; or the first color rubber material is soft plastic, and the second color rubber material is hard plastic.

[0007] Preferably, the primary molding exhaust groove includes a primary molding main exhaust groove located on the parting surface of the primary fixed mold, and a primary molding branch exhaust groove spaced apart and connected to the primary molding main exhaust groove and communicated with the primary cavity.

[0008] In the utility model, a secondary molding exhaust groove is arranged on the parting surface matched with the movable mold on the secondary fixed mold, and the secondary molding exhaust groove is opened on the outside of the secondary cavity formed by the movable mold and the secondary fixed mold and is connected with the outside air.

[0009] Preferably, the secondary molding exhaust groove includes a secondary molding main exhaust groove located on the parting surface of the secondary fixed mold, and a secondary molding branch exhaust groove spaced apart and connected to the secondary molding main exhaust groove and communicated with the secondary mold cavity.

[0010] As a further improvement of the utility model, an insert for accommodating a primary molding exhaust structure is also provided on the primary fixed mold, a mating surface is formed between the insert and the primary fixed mold, and an insert groove is provided on the mating surface of the insert, one end of the insert groove is connected to the cavity surface of the primary cavity, and the other end of the insert groove is connected to the outside air.

[0011] Preferably, there are several inserts, which are dispersedly arranged at intervals on the primary fixed mold.

[0012] Preferably, the insert is a cylindrical insert, the primary fixed mold is provided with an insert mounting hole connected to the cavity surface of the primary fixed mold, the cylindrical insert is installed in the insert mounting hole, and the insert groove is axially opened on the outer cylindrical surface of the cylindrical insert.

[0013] In the utility model, the two-color mold is a rotary two-color mold.

[0014] In the utility model, a concave-convex structure for enhancing the bonding strength at the junction of the first color rubber material and the second color rubber material is also arranged on the cavity surface of the primary fixed mold.

[0015] In the utility model, a groove rubber material remover for removing hot rubber material in the insert groove after the primary fixed mold is opened is externally connected to the primary fixed mold.

[0016] The beneficial effects of the utility model are:

[0017] First, the utility model is a two-color mold structure for reducing exhaust flash. The primary molding exhaust groove is arranged on the inner side of the parting surface of the primary fixed mold, so that the primary exhaust flash can be left at the position where the two plastic materials are combined. After the secondary injection molding, the primary exhaust flash is no longer visible, reducing the influence of the primary exhaust flash on the appearance of the injection molded product, thereby improving the quality of the entire injection molded product.

[0018] Secondly, the utility model provides a two-color mold structure for reducing exhaust flash. By arranging an insert for exhaust during one-time molding on the primary fixed mold, exhaust during one-time injection molding can be smoother, and the exhaust flash at the insert will be covered by the plastic material after the secondary injection molding. Moreover, since the primary exhaust flash is located on the joint surface of the two plastic materials, it is beneficial to enhance the bonding strength of the two plastic materials after injection molding.

[0019] Thirdly, the utility model provides a two-color mold structure for reducing exhaust flash, which can further enhance the bonding strength between the first color rubber and the second color rubber at the junction by setting a concave-convex structure on the cavity surface of the primary fixed mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a two-color mold structure for reducing exhaust flash in the utility model;

[0021] Figure 2 It is a structural schematic diagram of arranging inserts and insert grooves on a primary fixed mold.

[0022] In the figure: 1. fixed mold, 2. primary fixed mold, 3. secondary fixed mold, 4. parting surface, 5. primary molding exhaust groove, 6. primary cavity, 7. primary molding main exhaust groove, 8. primary molding branch exhaust groove, 9. secondary molding exhaust groove, 10. secondary cavity, 11. secondary molding main exhaust groove, 12. secondary molding branch exhaust groove, 13. insert, 14. matching surface, 15. insert groove. DETAILED DESCRIPTION

[0023] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0024] like Figures 1 to 2 The figure shows an embodiment of a two-color mold structure for reducing exhaust flash of the utility model, comprising a fixed mold 1 and a movable mold (not shown) matched with the fixed mold 1, the fixed mold 1 comprising a primary fixed mold 2 for injecting a first color rubber material and a secondary fixed mold 3 for injecting a second color rubber material, a primary molding exhaust groove 5 is provided on the parting surface 4 matched with the movable mold on the primary fixed mold 2, the primary molding exhaust groove 5 is opened in the direction of the inner side of a primary cavity 6 formed by the movable mold and the primary fixed mold 2 and is connected with the primary cavity 6.

[0025] Preferably, the first color rubber material is hard plastic, and the second color rubber material is soft plastic; or the first color rubber material is soft plastic, and the second color rubber material is hard plastic.

[0026] Preferably, the primary molding exhaust groove 5 includes a primary molding main exhaust groove 7 located on the parting surface 4 of the primary fixed mold 2, and a primary molding branch exhaust groove 8 which is spaced apart and connected to the primary molding main exhaust groove 7 and communicated with the primary cavity 6.

[0027] In this embodiment, a secondary molding exhaust groove 9 is provided on the parting surface 4 matched with the movable mold on the secondary fixed mold 3. The secondary molding exhaust groove 9 is opened on the outside of the secondary cavity 10 formed by the movable mold and the secondary fixed mold 3 and is connected to the outside air.

[0028] Preferably, the secondary molding exhaust groove 9 includes a secondary molding main exhaust groove 11 located on the parting surface 4 of the secondary fixed mold 3 , and a secondary molding branch exhaust groove 12 spaced apart and connected to the secondary molding main exhaust groove 11 and communicated with the secondary cavity 10 .

[0029] As a further improvement of the present embodiment, an insert 13 for accommodating a primary molding exhaust structure is further provided on the primary fixed mold 2, a mating surface 14 is formed between the insert 13 and the primary fixed mold 2, and an insert groove 15 is provided on the mating surface 14 of the insert 13, one end of the insert groove 15 is connected to the cavity surface of the primary cavity 6, and the other end of the insert groove 15 is connected to the outside air.

[0030] Preferably, there are several inserts 13 , which are dispersedly arranged at intervals on the primary fixed mold 2 .

[0031] Preferably, the insert 13 is a cylindrical insert, the primary fixed mold 2 is provided with an insert mounting hole connected to the cavity surface of the primary fixed mold 2, the cylindrical insert is installed in the insert mounting hole, and the insert groove 15 is axially opened on the outer cylindrical surface of the cylindrical insert.

[0032] In this embodiment, the two-color mold is a rotary two-color mold.

[0033] In this embodiment, a concave-convex structure for enhancing the bonding strength at the interface between the first color rubber material and the second color rubber material is also provided on the cavity surface of the primary fixed mold 2 .

[0034] In this embodiment, the primary fixed mold is also externally connected with a groove rubber material remover (not shown in the figure) for removing hot rubber material in the insert groove after the primary fixed mold is opened.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A two-color mold structure for reducing exhaust flash, characterized in that: It includes a fixed mold and a movable mold matched with the fixed mold, the fixed mold includes a primary fixed mold for injecting a first color rubber material and a secondary fixed mold for injecting a second color rubber material, a primary molding exhaust groove is arranged on the parting surface matched with the movable mold on the primary fixed mold, the primary molding exhaust groove is opened in the direction of the inner side of the primary cavity formed by the movable mold and the primary fixed mold and is connected with the primary cavity.

2. A two-color mold structure for reducing exhaust flash according to claim 1, characterized in that: The first color rubber material is hard rubber plastic, and the second color rubber material is soft rubber plastic; or the first color rubber material is soft rubber plastic, and the second color rubber material is hard rubber plastic.

3. A two-color mold structure for reducing exhaust flash according to claim 1, characterized in that: The primary molding exhaust groove includes a primary molding main exhaust groove located on the parting surface of the primary fixed mold, and a primary molding branch exhaust groove spaced apart and connected to the primary molding main exhaust groove and communicated with the primary cavity.

4. A two-color mold structure for reducing exhaust flash according to claim 1, characterized in that: A secondary molding exhaust groove is arranged on the parting surface matched with the movable mold on the secondary fixed mold. The secondary molding exhaust groove is opened on the outside of the secondary cavity formed by the movable mold and the secondary fixed mold and is connected with the outside air.

5. A two-color mold structure for reducing exhaust flash according to claim 4, characterized in that: The secondary molding exhaust groove includes a secondary molding main exhaust groove located on the parting surface of the secondary fixed mold, and a secondary molding branch exhaust groove connected to the secondary molding main exhaust groove at intervals and communicated with the secondary mold cavity.

6. A two-color mold structure for reducing exhaust flash according to claim 1, characterized in that: An insert for accommodating a primary molding exhaust structure is also provided on the primary fixed mold, a mating surface is formed between the insert and the primary fixed mold, and an insert groove is provided on the mating surface of the insert, one end of the insert groove is connected to the cavity surface of the primary cavity, and the other end of the insert groove is connected to the outside air.

7. A two-color mold structure for reducing exhaust flash according to claim 6, characterized in that: There are several inserts, which are dispersedly arranged at intervals on the primary fixed mold.

8. A two-color mold structure for reducing exhaust flash according to claim 6, characterized in that: The insert is a cylindrical insert, the primary fixed mold is provided with an insert mounting hole connected to the cavity surface of the primary fixed mold, the cylindrical insert is mounted in the insert mounting hole, and the insert groove is axially opened on the outer cylindrical surface of the cylindrical insert.

9. A two-color mold structure for reducing exhaust flash according to claim 1, characterized in that: The two-color mold is a rotary two-color mold.

10. A two-color mold structure for reducing exhaust flash according to claim 1, characterized in that: A concave-convex structure for enhancing the bonding strength at the junction of the first color rubber material and the second color rubber material is also arranged on the cavity surface of the primary fixed mold.

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