Punching device for high-precision punching of pouring gate of injection molding part

Abstract

The punching device comprises a punching mechanism used for punching the pouring gate of the injection molding part and a positioning carrying table used for bearing a half injection molding product, the punching mechanism comprises a first cutting die and a second cutting die which are matched with each other, the first cutting die and the second cutting die are respectively provided with a first coarse positioning piece, and a second coarse positioning piece is arranged on the first coarse positioning piece. The positioning platform deck is provided with a second coarse positioning piece, the first cutting die comprises a first cutter and a first fine positioning piece which are integrally connected, the second cutting die comprises a second cutter and a second fine positioning piece which are integrally connected, and the first coarse positioning piece and the second coarse positioning piece are matched so that the first fine positioning piece and the second fine positioning piece can be aligned with each other. The first fine positioning piece and the second fine positioning piece are matched to guide the cutting edges of the first cutter and the second cutter to be accurately aligned with the sprue punching line of the injection molding half product, so that high-precision punching of the sprue of the injection molding piece is guaranteed, and the surface of the injection molding piece after the sprue is cut off is flat, clean, smooth and free of residues.

Description

Technical Field

[0001] The utility model relates to the technical field of machinery, in particular to a punching device for high-precision punching of a gate of an injection molded part. Background Art

[0002] The injection molding machine introduces thermoplastic plastic or thermosetting plastic into the injection mold through the gate. The gate is the channel connecting the branch channel and the cavity in plastic injection molding. When the injection molded part is molded in the injection mold, the thermoplastic plastic or thermosetting plastic at the gate of the injection molded part will also solidify, and after solidification, it will be connected with the injection molded part. That is, the injection molded part gates arranged at adjacent intervals are connected through the runner located therebetween to form an injection molded semi-product. The intersection line where the injection molded part and the gate connected thereto intersect forms the gate punching line. Therefore, in order to obtain the final shape of the injection molded part, the gate needs to be cut off along the gate punching line.

[0003] Currently, many injection molded parts are cut out manually, but this can easily cause uneven cuts, such as hair, burrs or gaps, or accidentally cut into the injection molded parts, which makes it impossible to guarantee the product quality of the injection molded parts.

[0004] The other part is to use the milling cutter of the milling machine to mill the gate of the injection molded part to separate the injection molded part from the gate. However, material chips will be generated in the process, and subsequent cleaning is required, which makes the process complicated, the yield rate is reduced, and the cost is high.

[0005] Another part is to cut the gate of the injection molded parts by laser, but due to the low melting point of plastic, the gate of the injection molded parts is prone to burning during laser cutting, resulting in poor product appearance of the injection molded parts. Utility Model Content

[0006] To this end, in order to solve the above-mentioned problem, the utility model provides a punching device for high-precision punching of injection molded part gates, which ensures that the surface of the injection molded part is flat, clean, smooth and residue-free after the gate is removed by high-precision punching of the injection molded part gates.

[0007] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0008] The utility model provides a punching device for high-precision punching of injection molded part gates, comprising a punching mechanism for punching the injection molded part gates and a positioning platform for carrying the injection molded semi-finished product; the punching mechanism comprises a first cutting die and a second cutting die that match each other, the first cutting die and the second cutting die both have a first rough positioning member, the positioning platform has a second rough positioning member, the first cutting die comprises an integrally connected first cutter and a first fine positioning member, the second cutting die comprises an integrally connected second cutter and a second fine positioning member; the first rough positioning member and the second rough positioning member match each other so that the first fine positioning member and the second fine positioning member are aligned with each other; during punching, the first fine positioning member and the second fine positioning member match each other so as to guide the cutting edges of the first cutter and the second cutter to be precisely aligned with the gate punching line of the injection molded semi-finished product, so as to ensure high-precision punching of the injection molded part gate.

[0009] Furthermore, the first precision positioning member is an alignment boss, and the second precision positioning member is an alignment groove matching the alignment boss; when the blades of the first cutter and the second cutter contact the injection molded semi-finished product, the alignment boss is inserted into the notch of the alignment groove in advance.

[0010] Furthermore, an inclined guide surface is provided at the end of the alignment boss facing the alignment groove.

[0011] Further, the first coarse positioning member is a positioning column, and the second coarse positioning member is a positioning through hole that cooperates with the positioning column; or the first coarse positioning member is a positioning through hole, and the second coarse positioning member is a positioning column that cooperates with the positioning through hole; the positioning column is inserted into the positioning through hole so that the first fine positioning member and the second fine positioning member are aligned with each other to form a coarse positioning setting.

[0012] Furthermore, the positioning platform has a through groove running through its upper and lower surfaces and a positioning groove for positioning the injection molded part, the through groove is connected to the positioning groove, and the gate is suspended in the through groove; the first cutter and the first precision positioning part are both arranged on one side of the through groove, and the second cutter and the second precision positioning part are both arranged on the other side of the through groove; during punching, the first cutting die and the second cutting die are driven by a lifting drive unit to drive the first cutting die and the second cutting die to move toward each other to punch the injection molded semi-finished product.

[0013] Furthermore, the lifting drive unit includes a drive unit equipped with a servo motor or a cylinder.

[0014] Furthermore, the lifting drive unit is fixedly mounted on a frame, the frame is provided with a slide rail, and the positioning platform is slidably mounted on the slide rail; when the second rough positioning piece of the positioning platform is restricted by the first rough positioning piece of the first cutting die and the second cutting die, the lifting drive unit drives the first cutting die and the second cutting die to connect, so as to drive the first cutting die and the second cutting die to approach or move away from the positioning platform respectively.

[0015] Furthermore, when the first cutting die is located above the positioning platform, the first cutting die is provided with an abutting block for abutting the injection molded part and a driver for driving the abutting block to rise and fall. During punching, the driver drives the abutting block downward in advance to abut the injection molded part, thereby forming a limit for the injection molded semi-finished product.

[0016] The technical solution provided by the utility model has the following beneficial effects:

[0017] The first rough positioning member cooperates with the second rough positioning member to achieve preliminary alignment between the first fine positioning member and the second fine positioning member, and then the first fine positioning member cooperates with the second fine positioning member to guide the cutting edges of the first cutter and the second cutter to accurately align with the gate punching line of the injection molded semi-product, so as to ensure high-precision punching of the injection molded part gate, and to ensure that the surface of the injection molded part after the gate is cut off is flat, clean, smooth and free of residue. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure shows a schematic diagram of a punching device for high-precision punching of a gate of an injection molded part, which includes a frame and a lifting drive unit in an embodiment;

[0019] Figure 2 The figure shows a simplified cross-sectional view of a punching device for high-precision punching of a gate of an injection molded part without a frame and a lifting drive unit in an embodiment;

[0020] Figure 3 Shown Figure 2 A magnified schematic diagram of area A in the middle;

[0021] Figure 4 Shown is a schematic diagram of a semi-injection molded product in the embodiment;

[0022] Figure 5 The figure is a schematic diagram of the state of the punching device for high-precision punching of the gate of the injection molded part when the abutting pressing block is pressed down in the embodiment;

[0023] Figure 6 The figure is a schematic diagram of the state of the punching device used for high-precision punching of the gate of the injection molded part during punching in the embodiment. DETAILED DESCRIPTION

[0024] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0026] Reference Figures 1 to 3 As shown, this embodiment provides a punching device for high-precision punching of injection molded part gates (hereinafter referred to as the punching device), the punching device includes a punching mechanism 1 for punching the injection molded part gate 52 and a punching mechanism 1 for carrying a Figure 4 The positioning platform 2 of the injection molded semi-finished product 5 shown in the figure, the punching mechanism 1 includes a first cutting die 11 and a second cutting die 12 that match each other, the first cutting die 11 and the second cutting die 12 both have a first rough positioning member, the positioning platform 2 has a second rough positioning member, the first cutting die 11 includes a first cutting knife 112 and a first fine positioning member that are integrally connected, that is, the first cutting knife 112 and the first fine positioning member are fixed together by a first knife seat, the second cutting die 12 includes a second cutting knife 122 and a second fine positioning member that are integrally connected, that is, the second cutting knife 122 and the second fine positioning member are fixed together by a second knife seat.

[0027] The first coarse positioning member and the second coarse positioning member cooperate to align the first fine positioning member and the second fine positioning member with each other.

[0028] During punching, the first precision positioning member and the second precision positioning member cooperate to guide the cutting edges of the first cutter 112 and the second cutter 122 to be precisely aligned with the gate punching line 53 of the injection molded product 5 to ensure high-precision punching of the injection molded product gate 52.

[0029] In this embodiment, the first cutting die 11 and the second cutting die 12 are arranged up and down, that is, the first cutting die 11 is defined as the upper cutting die, and the second cutting die 12 is defined as the lower cutting die.

[0030] like Figure 5As shown, the positioning platform 2 has a through groove 21 passing through the upper and lower surfaces thereof and a positioning groove 22 for positioning the injection molded part 51, the through groove 21 is connected to the positioning groove 22, the gate is suspended in the through groove 21, the first cutter 112 and the first precision positioning member are both arranged on one side of the through groove 21, the second cutter 122 and the second precision positioning member are both arranged on the other side of the through groove 21, and during punching, the first cutting die 11 and the second cutting die 12 are driven by a lifting drive unit 4 to drive the first cutting die 11 and the second cutting die 12 to move toward each other to punch the injection molded semi-product 5.

[0031] like Figure 1 As shown, the lifting drive unit 4 is fixedly mounted on a frame 3. Specifically, the lifting drive unit 4 includes a drive unit equipped with a cylinder. The frame 3 is provided with a slide rail 31. The positioning platform 2 can be slidably mounted on the slide rail 31 to enable the positioning platform 2 to slide into a preset punching position on the slide rail 31 before punching, or slide out or leave the punching position after punching is completed.

[0032] When the second rough positioning piece of the positioning platform 2 is restricted by the first rough positioning pieces of the first cutting die 11 and the second cutting die 12, the lifting drive unit 4 drives the first cutting die 11 and the second cutting die 12 to drive the first cutting die 11 and the second cutting die 12 to approach or move away from the positioning platform 2 respectively.

[0033] like Figure 5 As shown, the specific first coarse positioning member is the positioning column 111, the specific second coarse positioning member is the positioning through hole 21 that cooperates with the positioning column 111, the positioning column 111 is inserted into the positioning through hole 21 so that the first fine positioning member and the second fine positioning member are aligned with each other to form a coarse positioning setting, and the specific first fine positioning member is the alignment boss 113, and the specific second fine positioning member is the alignment groove 123 that cooperates with the alignment boss 113.

[0034] When the blades of the first cutter 112 and the second cutter 122 contact the injection-molded semi-product 5, the alignment boss 113 is inserted into the notch of the alignment groove 123 in advance, so that the blades of the first cutter 112 and the second cutter 122 can be prevented from accidentally colliding with each other and breaking due to misalignment or offset, thereby preventing the appearance of residual hair at the gate and other poor appearance.

[0035] When the positioning platform 2 needs to move to the punching position or leave the punching position, the lifting drive unit 4 drives the first cutting die 11 to lift up and synchronously drives the second cutting die 12 to descend, so as to ensure that the distance between the first cutting die 11 and the second cutting die 12 is large enough, thereby ensuring that the positioning platform 2 will not collide with the first cutting die 11 and the second cutting die 12 during the process of sliding into or leaving the punching position, and no structural interference will occur between each other.

[0036] like Figure 5 and Figure 6As shown in the figure, when the positioning platform 2 has moved to the punching position and is ready to punch the injection molded semi-finished product 5, the lifting drive unit 4 drives the first cutting die 11 to descend and synchronously drives the second cutting die 12 to lift upward. First, the positioning columns 111 of the first cutting die 11 and the second cutting die 12 are lifted and inserted into the positioning through holes 21 of the positioning platform 2 to ensure that the cutting knives or cutting edges of the first cutting die 11 and the second cutting die 12 are respectively matched with the punching positions of the injection molded semi-finished product 5 on the positioning platform 2, and at the same time ensure that the alignment boss 113 can be preliminarily aligned with the notch of the alignment groove 123. Then, the first cutting die 11 is lifted and lowered. The mold 11 and the second cutting mold 12 are continuously driven by the lifting drive unit 4 and approach each other until the alignment boss 113 is accurately inserted into the alignment groove 123 to ensure that the cutting edges of the first cutting mold 11 and the second cutting mold 12 are accurately aligned with the gate punching line 53 of the injection molded semi-product 5. Then the punching device punches the gate of the injection molded semi-product 5 to obtain an injection molded part 51 with qualified size and appearance. After the punching is completed, the lifting drive unit 4 drives the first cutting mold 11 to lift up again and synchronously drives the second cutting mold 12 to descend to facilitate the next step of positioning the carrier 2 to leave the punching position.

[0037] The first rough positioning member cooperates with the second rough positioning member to achieve preliminary alignment between the first fine positioning member and the second fine positioning member, and then the first fine positioning member cooperates with the second fine positioning member to guide the cutting edges of the first cutter 112 and the second cutter 122 to accurately align with the gate punching line 53 of the injection-molded semi-product 5, so as to ensure high-precision punching of the injection-molded part gate 52, so as to ensure that the surface of the injection-molded part 51 after the gate is removed is flat, clean, smooth and free of residue.

[0038] In addition, the punching device does not generate material scraps during the punching process, so there is no need to add subsequent cleaning. This simplifies the process, and the punching yield can be further improved, thereby reducing costs.

[0039] Of course, in other embodiments, the first rough positioning member may also be a positioning through hole 21 , and the second rough positioning member may be a positioning column 111 matching the positioning through hole 21 .

[0040] Furthermore, the lifting drive unit 4 may also include a drive unit equipped with a servo motor.

[0041] In another preferred embodiment, Figure 5 The first cutting die 11 shown above the positioning platform 2, that is, the upper cutting die, is provided with an abutting pressing block 114 for abutting the injection molded part 51 and a driver for driving the abutting pressing block 114 to rise and fall, and the specific driver is a slide cylinder.

[0042] During punching, the driver drives the abutment block 114 to press down in advance to abut against the injection molded part 51, thereby forming a limit for the injection molded semi-product 5, that is, during the punching process of the injection molded part gate 52, the abutment block 114 always abuts against the injection molded part 51 to prevent the injection molded part 51 or the injection molded semi-product 5 from being misplaced or offset on the positioning carrier 2, thereby avoiding misplacement or offset of the punching position to ensure more accurate punching.

[0043] In another preferred embodiment, an inclined guide surface is provided at the end of the alignment boss 113 facing the alignment groove 123 to facilitate the alignment boss 113 to slide smoothly into the alignment groove 123 .

[0044] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A punching device for high-precision punching of injection molded parts gates, characterized in that: It includes a punching mechanism for punching the gate of the injection molded part and a positioning platform for carrying the semi-injection molded product; The punching mechanism comprises a first cutting die and a second cutting die that match each other, the first cutting die and the second cutting die both have a first rough positioning member, the positioning platform has a second rough positioning member, the first cutting die comprises a first cutting knife and a first fine positioning member that are integrally connected, and the second cutting die comprises a second cutting knife and a second fine positioning member that are integrally connected; The first coarse positioning member and the second coarse positioning member cooperate to align the first fine positioning member and the second fine positioning member with each other; During punching, the first precision positioning member and the second precision positioning member cooperate to guide the cutting edges of the first cutter and the second cutter to be precisely aligned with the gate punching line of the injection molded semi-finished product to ensure high-precision punching of the injection molded part gate.

2. The punching device for high-precision punching of injection molded parts gate according to claim 1, characterized in that: The first precision positioning member is a positioning boss, and the second precision positioning member is a positioning groove matching the positioning boss; when the blades of the first cutter and the second cutter contact the injection molded semi-finished product, the positioning boss is inserted into the notch of the positioning groove in advance.

3. The punching device for high-precision punching of injection molded parts gate according to claim 2, characterized in that: An inclined guide surface is provided at the end of the alignment boss facing the alignment groove.

4. The punching device for high-precision punching of injection molded parts gate according to claim 1, characterized in that: The first coarse positioning member is a positioning column, and the second coarse positioning member is a positioning through hole that matches the positioning column; or the first coarse positioning member is a positioning through hole, and the second coarse positioning member is a positioning column that matches the positioning through hole; the positioning column is inserted into the positioning through hole so that the first fine positioning member and the second fine positioning member are aligned with each other to form a coarse positioning setting.

5. The punching device for high-precision punching of injection molded parts gates according to any one of claims 1 to 4, characterized in that: The positioning platform has a through groove running through its upper and lower surfaces and a positioning groove for positioning the injection molded part, the through groove is connected to the positioning groove, and the gate is suspended in the through groove; the first cutter and the first precision positioning member are both arranged on one side of the through groove, and the second cutter and the second precision positioning member are both arranged on the other side of the through groove; during punching, the first cutting die and the second cutting die are driven by a lifting drive unit to drive the first cutting die and the second cutting die to move toward each other to punch the injection molded semi-finished product.

6. The punching device for high-precision punching of injection molded parts gate according to claim 5, characterized in that: The lifting drive unit includes a drive unit equipped with a servo motor or a cylinder.

7. The punching device for high-precision punching of injection molded parts gate according to claim 5, characterized in that: The lifting drive unit is fixedly mounted on a frame, the frame is provided with a slide rail, and the positioning platform is slidably mounted on the slide rail; when the second rough positioning piece of the positioning platform is restricted by the first rough positioning piece of the first cutting die and the second cutting die, the lifting drive unit drives the first cutting die and the second cutting die to connect, so as to drive the first cutting die and the second cutting die to approach or move away from the positioning platform respectively.

8. The punching device for high-precision punching of injection molded parts gates according to any one of claims 1 to 4, characterized in that: When the first cutting die is located above the positioning platform, the first cutting die is provided with an abutting block for abutting the injection molded part and a driver for driving the abutting block to rise and fall. During punching, the driver drives the abutting block downward in advance to abut the injection molded part, thereby forming a limit for the injection molded semi-finished product.

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