Injection mold for forming by retreating cutter

Abstract

The utility model relates to the technical field of injection molds, and particularly discloses a retreating cutter forming injection mold which comprises a lower mold base and an upper mold base, a lower mold core is arranged at the upper end of the lower mold base, an upper mold core is arranged at the lower end of the upper mold base, an injection molding cavity is formed between the upper mold core and the lower mold core, and a first injection molding area and a second injection molding area are arranged in the injection molding cavity. The first injection molding area is connected with a main injection nozzle through a first injection molding channel, the second injection molding area is connected with an auxiliary injection nozzle through a second injection molding channel, and a movably-arranged cutter assembly is arranged in the second injection molding area and abuts against the joint of the second injection molding channel and the second injection molding area. And the cutter assembly is connected with a micro oil cylinder for driving the cutter assembly to move. The device is simple and convenient to operate, reasonably utilizes the cutter assembly, is simple and compact in structure, does not need a complex slide control mechanism, does not need midway mold opening and rotation, saves the production cost, improves the production cycle, and can meet the production requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold for back-cutting knife molding. Background Art

[0002] Two-color injection molding is a manufacturing method that molds two different materials at one time. It is mainly used to produce plastic products with two different properties. It is usually completed by a set of injection molds and a two-color injection molding machine.

[0003] Currently, when performing two-color injection molding, the first shot is injected into the injection mold through a two-color injection molding machine. After the first shot is formed, the mold needs to be opened once and rotated a certain angle before the second shot is injected again to complete the two-color injection molding. Finally, the excess water outlet is cut off by the cutter assembly.

[0004] At present, most of the cutter components used in injection molds have a single function and can only be used to cut out excess materials without other functions. The two-color injection molding method has high production costs and a long cycle. There may be risks of falling or impurities floating in when the mold is opened midway. In addition, the current injection molding process still has the problem of component displacement in the mold, which cannot meet production needs. Utility Model Content

[0005] In view of the defects of the above-mentioned prior art, the utility model provides an injection mold for backward cutting knife molding, which is simple and convenient to operate, makes rational use of the cutting knife assembly, has a simple structure, does not require mold opening and rotation in the middle, saves production costs, improves production cycle, and can meet production needs.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The injection mold for backward cutting knife molding includes a lower mold base and an upper mold base, a lower mold core is provided at the upper end of the lower mold base, an upper mold core is provided at the lower end of the upper mold base, an injection cavity is formed between the upper mold core and the lower mold core, a first injection area and a second injection area are provided in the injection cavity, the first injection area is connected to a main nozzle through a first injection channel, the second injection area is connected to an auxiliary nozzle through a second injection channel, a movably arranged cutting knife assembly is provided in the second injection area, the cutting knife assembly abuts against the connection between the second injection channel and the second injection area, and the cutting knife assembly is connected to a micro-cylinder for driving its movement.

[0008] In the above description, preferably, the first injection channel includes a first main injection channel and a plurality of first branch injection channels, the second injection channel includes a second main injection channel and a plurality of second branch injection channels, the lower end of the first main injection channel is connected with the first branch injection channel, the first branch injection channel extends through the upper mold core into the injection cavity, and faces the first injection area, the second main injection channel transversely penetrates the upper mold base, the second main injection channel is connected with the second branch injection channel, the second branch injection channel extends through the upper mold core into the injection cavity, and faces the second injection area.

[0009] In the above description, as a preference, the cutter assembly includes an annular cutter and a mounting seat, the upper end surface of the annular cutter abuts against the bottom of the second branch injection channel, the mounting seat is connected to the micro-cylinder, the micro-cylinder is installed on the lower mold base through the mounting frame, and can drive the annular cutter through the lower mold core to extend into the injection cavity.

[0010] In the above description, as a preference, guide sleeves are provided at the four corners of the upper die seat, and the lower die seat is provided with guide posts corresponding to the positions of the guide sleeves, and the guide posts are inserted into the guide sleeves.

[0011] In the above description, as a preference, the upper end of the upper die base is connected to a top plate, and the lower end of the lower die base is connected to a bottom plate.

[0012] The beneficial effects of the utility model are as follows: an injection cavity is formed between the upper mold core and the lower mold core, a first injection area and a second injection area are arranged in the injection cavity, the first injection area is connected with a main nozzle through a first injection channel, the second injection area is connected with an auxiliary nozzle through a second injection channel, a cutter assembly is against a connection between the second injection channel and the second injection area, and the cutter assembly is connected with a micro-cylinder for driving its movement, the injection cavity is divided into the first injection area and the second injection area, the first injection area completes a first shot through the first injection channel through the main nozzle, the micro-cylinder drives the cutter assembly to separate from the connection between the second injection channel and the second injection area, so that the second injection area is connected with the second injection channel and the auxiliary nozzle, the second injection area completes a second shot through the second injection channel through the auxiliary nozzle, and two-color encapsulation injection molding is achieved, the operation is simple and convenient, the cutter assembly is reasonably utilized, the structure is simple and compact, no complicated position control mechanism is required, no mold opening and rotation are required in the middle, production costs are saved, production cycle is improved, and production needs can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 : It is a structural schematic diagram of an embodiment of the utility model;

[0014] Figure 2 : It is a schematic diagram of the internal structure of an embodiment of the utility model;

[0015] Figure 3: It is a schematic diagram of the injection cavity structure of an embodiment of the utility model;

[0016] Description of the accompanying drawings: 10-lower mold base, 11-top plate, 12-guide sleeve, 13-upper mold core, 20-upper mold base, 21-bottom plate, 22-guide column, 23-lower mold core, 30-injection cavity, 31-first general injection channel, 32-first branch injection channel, 33-second general injection channel, 34-second branch injection channel, 35-main nozzle, 36-auxiliary nozzle, 40-annular cutter, 41-mounting seat, 42-micro cylinder, 43-mounting frame. DETAILED DESCRIPTION

[0017] In order to more clearly explain the structural features, technical means and specific purposes and functions achieved by the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0018] This embodiment: Figure 1-3 As shown, the double-color injection molding overmolding mold comprises a lower mold base 10 and an upper mold base 20, the upper end of the upper mold base 20 is connected to a top plate 11, the lower end of the lower mold base 10 is connected to a bottom plate 21, the four corners of the upper mold base 20 are provided with guide sleeves 12, the lower mold base 10 is provided with guide columns 22 corresponding to the position of the guide sleeves 12, the guide columns 22 are inserted into the guide sleeves 12, so that the upper mold base 20 and the lower mold base 10 are kept in a fixed position when opening and closing, the upper end of the lower mold base 10 is provided with a lower mold core 23, the lower end of the upper mold base 20 is provided with an upper mold core 13, and an injection cavity 30 is formed between the upper mold core 13 and the lower mold core 23;

[0019] The injection cavity 30 is provided with a first injection area and a second injection area. The first injection area is connected to a main nozzle 35 through a first injection channel. The first injection channel includes a first main injection channel 31 and a plurality of first branch injection channels 32. The lower end of the first main injection channel 31 is connected to the first branch injection channels 32. The first branch injection channels 32 penetrate the upper mold core 13 and extend into the injection cavity 30, and face the first injection area, for performing the first injection molding of the product.

[0020] The second injection molding area is connected to the auxiliary nozzle 36 through the second injection molding channel. The second injection molding channel includes a second main injection molding channel 33 and a plurality of second branch injection molding channels 34. The second main injection molding channel 33 transversely penetrates the upper mold base 20. The second main injection molding channel 33 is connected to the second branch injection molding channel 34. The second branch injection molding channel 34 penetrates the upper mold core 13 and extends into the injection molding cavity 30, and faces the second injection molding area. A movably arranged cutter assembly is arranged in the second injection molding area. The cutter assembly is against the connection between the second injection molding channel and the second injection molding area. The cutter assembly is connected to a micro-cylinder 42 for driving its movement. The cutter assembly is provided There are multiple cutter assemblies, and the number of the cutter assemblies corresponds to the second branch injection channel 34. The cutter assembly includes an annular cutter 40 and a mounting seat 41. The upper end surface of the annular cutter 40 is against the bottom of the second branch injection channel 34. The mounting seat 41 is connected to the micro-cylinder 42. The micro-cylinder 42 is installed on the lower mold base 10 through the mounting frame 43, and can drive the annular cutter 40 to pass through the lower mold core 23 and extend into the injection cavity 30. When the micro-cylinder 42 drives the annular cutter 40 and the mounting seat 41 to move downward, the second branch injection channel 34 is connected to the second injection area, and the product is injected for the second time through the second branch injection channel 34.

[0021] When in use, the injection molding liquid is injected into the first injection molding area through the main nozzle 35 via the first main injection molding channel 31 and multiple first branch injection molding channels 32 to complete the first injection molding. After cooling, the annular cutter 40 and the mounting seat 41 are driven downward by the micro cylinder, and the annular cutter 40 is separated from the connection between the second injection molding channel 34 and the second injection molding area, so that the second injection molding area is connected with the second injection molding channel 34 and the auxiliary nozzle 36. The injection molding liquid is injected into the second injection molding area through the auxiliary nozzle 36 via the second main injection molding channel 33 and multiple second branch injection molding channels 34 to complete the second injection molding. The operation is simple and convenient, the cutter assembly is reasonably used, the structure is simple and compact, no complex sliding control mechanism is required, and no mold opening and rotation are required in the middle, so that two-color encapsulation injection molding can be achieved, which saves production costs, improves production cycle, and can meet production needs.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Therefore, any modification, equivalent replacement, improvement, etc. made to the above embodiment based on the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. The injection mold for back-cutting knife forming comprises a lower mold base and an upper mold base, and is characterized in that: A lower mold core is provided at the upper end of the lower mold base, an upper mold core is provided at the lower end of the upper mold base, an injection cavity is formed between the upper mold core and the lower mold core, a first injection area and a second injection area are provided in the injection cavity, the first injection area is connected to a main nozzle through a first injection channel, the second injection area is connected to an auxiliary nozzle through a second injection channel, a movably arranged cutter assembly is provided in the second injection area, the cutter assembly abuts against the connection between the second injection channel and the second injection area, and the cutter assembly is connected to a micro-cylinder for driving its movement.

2. The injection mold for forming a backward cutter according to claim 1, characterized in that: The first injection channel includes a first main injection channel and a plurality of first branch injection channels, the second injection channel includes a second main injection channel and a plurality of second branch injection channels, the lower end of the first main injection channel is connected with the first branch injection channel, the first branch injection channel extends through the upper mold core into the injection cavity and faces the first injection area, the second main injection channel transversely penetrates the upper mold base, the second main injection channel is connected with the second branch injection channel, the second branch injection channel extends through the upper mold core into the injection cavity and faces the second injection area.

3. The injection mold for forming a receding cutter according to claim 2, characterized in that: The cutter assembly includes an annular cutter and a mounting seat. The upper end surface of the annular cutter is against the bottom of the second branch injection channel. The mounting seat is connected to the micro-cylinder. The micro-cylinder is installed on the lower mold base through the mounting frame and can drive the annular cutter through the lower mold core to extend into the injection cavity.

4. The injection mold for forming a receding cutter according to claim 1, characterized in that: The four corners of the upper die seat are provided with guide sleeves, and the lower die seat is provided with guide posts corresponding to the positions of the guide sleeves, and the guide posts are inserted into the guide sleeves.

5. The injection mold for retreating cutter molding according to claim 1, characterized in that: The upper end of the upper die base is connected with a top plate, and the lower end of the lower die base is connected with a bottom plate.

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