Injection molding green compact water gap laser cutting tool clamp

Abstract

The utility model relates to injection molding part processing and laser cutting auxiliary equipment technical field, and disclose a kind of injection molding green body water gap laser cutting tool fixture, including pedestal main body, positioning assembly, fixed component and power component, the pedestal main body is rectangular plate structure, its material is aluminium alloy or cast iron, the upper surface of pedestal main body is formed even mounting surface after milling processing.This device is equipped with conical guide section in the positioning pin top of positioning assembly, and injection molding green body bottom positioning hole sleeve can be quickly guided to enter, to avoid artificial alignment time-consuming;Elastic buffer sleeve in the middle of pin body can compensate the tiny gap between positioning hole and pin body, and the preliminary positioning deviation is controlled to be ≤0.2mm;With movable positioning block from side face, form the double-dimension positioning of "pin + side positioning", ensure green body coaxiality and horizontal accuracy, and the residual error of laser cutting water gap is reduced from traditional 0.5mm to below 0.1mm.

Description

Technical Field

[0001] This utility model relates to the technical field of injection molding parts processing and laser cutting auxiliary equipment, specifically a laser cutting fixture for injection molding green preform sprue. Background Technology

[0002] In the laser cutting of injection molding preform gates, traditional tooling fixtures suffer from four major pain points, severely restricting processing efficiency, product yield, and equipment compatibility:

[0003] Low positioning accuracy and reliance on manual adjustment: Traditional fixtures mostly use manual visual positioning or single pin positioning. When the positioning hole at the bottom of the injection molded blank is engaged with the pin, it is easy to deviate (deviation exceeding 1mm), requiring repeated manual fine-tuning, and a single positioning takes 5-8 minutes; moreover, laser cutting has extremely high requirements for positioning accuracy (≤0.3mm). Positioning deviation directly leads to incomplete sprue cutting (residual exceeding 0.5mm) or damage to the blank body, with a scrap rate exceeding 10%.

[0004] The fixing method is cumbersome and inefficient: Traditional fixing methods mostly use manual bolt tightening or clamping plates, and each bolt needs to be tightened one by one to ensure that the green blank is fixed. Each fixing takes 3-5 minutes. Moreover, the green blank is prone to shifting due to uneven force during the fixing process, and needs to be repositioned, which further extends the processing preparation time. When processing in batches, only 20-30 green blanks can be processed per hour, resulting in a sharp drop in efficiency.

[0005] Rigid clamping can easily damage the green blank: The injection-molded green blank is not fully cured and the material is relatively soft (Shore hardness ≤60D). The rigid metal clamping surface of traditional clamps has no buffer structure. Excessive clamping force can cause indentation and deformation on the outer wall of the green blank (damage rate exceeds 15%). Especially for thin-walled or irregularly shaped green blanks, the clamping stress can easily cause warping after cutting, which cannot meet the subsequent assembly requirements.

[0006] Poor compatibility and high changeover cost: The fixing blocks and positioning structures of traditional fixtures are of fixed size and can only be adapted to a single specification of injection molded blank. When changing to a different size blank, the fixture components need to be disassembled and replaced, which takes 15-20 minutes. In addition, multiple sets of fixtures need to be stored, increasing equipment investment and storage costs, making it difficult to adapt to the production needs of multiple varieties and small batches. Utility Model Content

[0007] The purpose of this invention is to provide a laser cutting fixture for injection molding green gates, which solves the above-mentioned technical problems.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a laser cutting fixture for injection molding green gates, comprising a base body, a positioning component, a fixing component, and a power component. The base body is a rectangular plate structure made of aluminum alloy or cast iron, and the upper surface of the base body is milled to form a flat mounting surface.

[0009] The positioning component is disposed on the upper surface of the base body. The positioning component includes at least two positioning pins and at least two positioning blocks. The positioning pins are vertically fixed on the upper surface of the base body, and the axis of the positioning pins is perpendicular to the upper surface of the base body. The positioning blocks are disposed on one side of the positioning pins and can move in a direction parallel to the upper surface of the base body.

[0010] The fixing component includes at least two sets of fixing blocks. The fixing blocks are fixed on the upper surface of the base body. The fixing blocks and the positioning blocks are located on opposite sides of the injection molding blank. The side of the fixing block facing the injection molding blank is in contact with the outer wall of the injection molding blank.

[0011] The power assembly includes an air nozzle, which is fixedly installed on the side or bottom of the base body. The air nozzle is used to connect to an air pressure source or a vacuum source, and is connected to a positioning component or a fixing component through an internal air passage.

[0012] Preferably, the positioning pin includes an integrally formed pin body and a connecting part. The top of the pin body is set as a tapered guide section with a taper of 1:5 to 1:10. An elastic buffer sleeve is fitted on the outer side of the middle part of the pin body. The elastic buffer sleeve is made of silicone, fluororubber or EPDM rubber and has a thickness of 0.5mm to 2mm.

[0013] Preferably, the number of air nozzles is at least one. The air inlet end of the air nozzle is connected to an external air pressure source through a high-pressure air pipe. The air outlet end of the air nozzle is connected to an air passage opened inside the base body. The air passage extends along the thickness or length direction of the base body. The end of the air passage is connected to a piston chamber. The piston chamber is opened inside the base body and located below the positioning block. The axis of the piston chamber is parallel to the moving direction of the positioning block.

[0014] Preferably, the fixing block includes a block-shaped body made of the same material as the base body. The upper half of the block-shaped body has a waist-shaped adjustment hole. The length of the waist-shaped adjustment hole extends in a horizontal direction perpendicular to the moving direction of the positioning block. The width of the waist-shaped adjustment hole is slightly larger than the diameter of the locking bolt passing through it. The block-shaped body is fixedly connected to the base body by the locking bolt. The screw part of the locking bolt passes through the waist-shaped adjustment hole and engages with the threaded hole on the base body. An anti-slip pad is provided between the head of the locking bolt and the upper surface of the block-shaped body. The anti-slip pad is a rubber pad or a metal toothed pad to prevent the locking bolt from loosening.

[0015] Preferably, the surfaces of the positioning pins, positioning blocks, and fixing blocks that are in direct contact with the injection-molded preform are provided with a flexible protective coating. The thickness of the flexible protective coating is 0.1 mm to 0.5 mm, and the material of the flexible protective coating is polytetrafluoroethylene, modified epoxy resin, or ethylene-vinyl acetate copolymer.

[0016] This utility model provides a laser cutting fixture for injection molding green gates. It has the following beneficial effects:

[0017] 1. This device features a tapered guide section at the top of the positioning pin of the positioning component, which can quickly guide the positioning hole at the bottom of the injection molding green body into place, avoiding the time-consuming manual alignment; the elastic buffer sleeve in the middle of the pin body can compensate for the small gap between the positioning hole and the pin body, controlling the initial positioning deviation to ≤0.2mm; together with the movable positioning block to abut from the side, a two-dimensional positioning of "pin + side positioning" is formed, ensuring the coaxiality and horizontal accuracy of the green body, and reducing the residual error of the laser cutting gate from the traditional 0.5mm to below 0.1mm.

[0018] 2. The air nozzle of the power component of this device is connected to an external air pressure source. Compressed air enters the piston chamber through the air passage inside the base body, pushing the positioning block to move horizontally and cooperate with the fixing block of the fixing component to clamp the green blank. The entire fixing process does not require manual operation, and the time is reduced from the traditional 3-5 minutes to 10-15 seconds. It can process 80-100 green blanks per hour, improving the processing efficiency by more than 3 times. At the same time, it avoids the problem of uneven force distribution caused by manual fixing, and the green blank offset rate is reduced from 8% to less than 1%.

[0019] 3. The surfaces of the positioning pins, positioning blocks, and fixing blocks that come into contact with the green blank are all covered with a flexible protective coating of 0.1-0.5mm thickness. This coating has both low friction and high elasticity, which can buffer the squeezing force on the soft green blank and reduce the green blank outer wall indentation damage rate from 15% to less than 2%. The elastic buffer sleeve of the positioning pin can further absorb the impact force during assembly and prevent the green blank positioning hole from cracking.

[0020] 4. The fixing block of the fixing component of this device has a waist-shaped adjustment hole that extends perpendicular to the moving direction of the positioning block. The horizontal position of the fixing block can be adjusted by loosening the locking bolt. It can adapt to injection molded green blanks of different widths without replacing the component. With the pneumatically adjustable stroke of the positioning block, it can cover the fixing needs of green blanks of various specifications. When changing the shape, there is no need to disassemble the fixture. Only the position of the fixing block and the air pressure parameters need to be adjusted. The changeover time is shortened from 15-20 minutes to 2-3 minutes, reducing the investment cost of multiple sets of fixtures and adapting to multi-variety production scenarios. Attached Figure Description

[0021] Figure 1 This is a perspective view of the overall structure of this utility model;

[0022] Figure 2 This is an exploded view of the structure of this utility model;

[0023] Figure 3 This is a view of the airway structure of this utility model;

[0024] Figure 4This is a structural view of the piston cavity of this utility model.

[0025] In the figure: base body 1, positioning component 2, fixing component 3, power component 4, injection molding preform 5, positioning pin 21, positioning block 22, fixing block 31, block body 311, waist-shaped adjustment hole 312, air nozzle 41, air passage 11, piston chamber 14. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] Example 1:

[0029] A preferred embodiment of the laser cutting fixture for injection molding green gates provided by this utility model is as follows: Figure 1-4 As shown: A laser cutting fixture for injection molding green gates includes a base body 1, a positioning component 2, a fixing component 3, and a power component 4. The base body 1 is a rectangular plate structure made of aluminum alloy or cast iron. The upper surface of the base body 1 is milled to form a flat mounting surface.

[0030] The positioning component 2 is disposed on the upper surface of the base body 1. The positioning component 2 includes at least two positioning pins 21 and at least two positioning blocks 22. The positioning pins 21 are vertically fixed on the upper surface of the base body 1. The axis of the positioning pins 21 is perpendicular to the upper surface of the base body 1. The positioning pins 21 are used to cooperate with the positioning holes preset at the bottom of the injection molding green blank 5 to achieve the initial positioning of the injection molding green blank 5. The positioning blocks 22 are disposed on one side of the positioning pins 21. The positioning blocks 22 are movable in a direction parallel to the upper surface of the base body 1. The positioning blocks 22 are used to abut against the side of the injection molding green blank 5 to limit the horizontal position of the injection molding green blank 5.

[0031] The fixing component 3 includes at least two sets of fixing blocks 31. The fixing blocks 31 are fixed on the upper surface of the base body 1. The fixing blocks 31 and the positioning blocks 22 are located on opposite sides of the injection molding blank 5. The side of the fixing block 31 facing the injection molding blank 5 is in contact with the outer wall of the injection molding blank 5 so as to cooperate with the positioning blocks 22 to achieve the clamping and fixing of the injection molding blank 5.

[0032] The power assembly 4 includes an air nozzle 41, which is fixedly installed on the side or bottom of the base body 1. The air nozzle 41 is used to connect to a pneumatic or vacuum source. The air nozzle 41 is connected to the positioning assembly 2 or the fixing assembly 3 through the internal air passage 11 to drive the positioning assembly 2 or the fixing assembly 3 to automatically clamp or release the injection molding green blank 5. Through the above structure, the injection molding green blank 5 can be quickly and accurately positioned and fixed on the base body 1, ensuring that the injection molding green blank 5 will not shift or shake when the laser cutting equipment cuts the sprue of the injection molding green blank 5, thereby ensuring the consistency of cutting accuracy and sprue residue, and improving production efficiency and product yield.

[0033] Example 2:

[0034] Please see Figures 1-4 Furthermore, based on Embodiment 1, the positioning pin 21 includes an integrally formed pin body and a connecting part. The top of the pin body is set as a tapered guide section with a taper of 1:5 to 1:10 to facilitate the quick insertion of the positioning pin 21 into the positioning hole of the injection-molded green blank 5. An elastic buffer sleeve is provided on the outer side of the middle part of the pin body. The material of the elastic buffer sleeve is silicone, fluororubber or EPDM rubber, and the thickness of the elastic buffer sleeve is 0.5mm to 2mm.

[0035] There is at least one air nozzle 41. The air inlet of the air nozzle 41 is connected to an external air pressure source through a high-pressure air pipe. The air outlet of the air nozzle 41 is connected to an air passage 11 opened inside the base body 1. The air passage 11 extends along the thickness or length direction of the base body 1. The end of the air passage 11 is connected to a piston chamber 14. The piston chamber 14 is opened inside the base body 1 and located below the positioning block 22. The axis of the piston chamber 14 is parallel to the moving direction of the positioning block 22.

[0036] The fixing block 31 includes a block body 311. The block body 311 is made of the same material as the base body 1 or high-strength engineering plastic. The upper half of the block body 311 is provided with a waist-shaped adjustment hole 312. The length direction of the waist-shaped adjustment hole 312 extends in a horizontal direction perpendicular to the moving direction of the positioning block 22. The width of the waist-shaped adjustment hole 312 is slightly larger than the diameter of the locking bolt passing through it. The block body 311 is fixedly connected to the base body 1 by the locking bolt. The screw part of the locking bolt passes through the waist-shaped adjustment hole 312 and is threaded into the threaded hole on the base body 1. An anti-slip pad is provided between the head of the locking bolt and the upper surface of the block body 311. The anti-slip pad is a rubber pad or a metal toothed pad to prevent the locking bolt from loosening.

[0037] The surfaces of the positioning pin 21, positioning block 22, and fixing block 31 that are in direct contact with the injection molding preform 5 are all provided with a flexible protective coating. The thickness of the flexible protective coating is 0.1 mm to 0.5 mm, and the material of the flexible protective coating is polytetrafluoroethylene, modified epoxy resin, or ethylene-vinyl acetate copolymer.

[0038] When in use, the operator places the injection molding green blank 5 with the sprue to be cut on the flat mounting surface of the base body 1, so that the pre-set positioning hole at the bottom of the green blank is aligned with the positioning pin 21 of the positioning component 2.

[0039] The tapered guide section at the top of the positioning pin 21 guides the positioning hole to quickly fit into the pin body. The elastic buffer sleeve in the middle of the pin body is deformed under pressure, compensating for the gap between the positioning hole and the pin body, realizing the initial positioning of the green blank, and ensuring that the center of the green blank is aligned with the laser cutting reference.

[0040] The air nozzle 41 is connected to a high-pressure air source through an external pipeline. Compressed air enters the air passage 11 inside the base body through the air nozzle and extends along the thickness / length direction to ensure stable air pressure transmission.

[0041] The air passage 11 is connected to the piston chamber 14 at the end. Compressed air pushes the piston in the piston chamber to move, thereby driving the positioning block 22 to move closer to the injection molding green preform 5 in the horizontal direction.

[0042] After the positioning block 22 contacts the side of the injection molding green blank 5, it continues to move until it cooperates with the fixing block 31 of the fixing component 3, forming a clamping force from the opposite sides of the green blank. The clamping force can be adjusted by air pressure to avoid excessive force. At this time, the green blank is completely fixed and there is no risk of horizontal displacement or shaking.

[0043] The fixing block 31 is pre-adjusted to a position that matches the size of the green embryo through the waist-shaped adjustment hole 312. Its side facing the green embryo is in close contact with the outer wall of the green embryo, forming a "two-way clamping" with the positioning block 22.

[0044] The laser cutting equipment is started to cut the sprue of the injection molding preform 5. Since the preform is precisely fixed, there is no displacement during the cutting process, and the residual error of the sprue is ≤0.1mm. During the cutting process, the fixing block 31 always provides stable support to avoid the preform from undergoing slight deformation due to the heat effect of the laser.

[0045] After the sprue is cut off, the air pressure source of the air nozzle is cut off, or the air nozzle is switched to a vacuum source. The air pressure in the piston chamber 14 is released or negative pressure is generated. The piston drives the positioning block 22 to move in the opposite direction and disengage from the side of the injection molding green blank 5.

[0046] The operator lifts the injection molding preform 5 upwards, causing its positioning hole to disengage from the positioning pin 21, thus completing the removal of the preform. If continuous processing is required, steps 1-4 can be repeated without additional adjustment of the fixture structure.

[0047] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A laser cutting fixture for injection molding green gates, characterized in that, It includes a base body (1), a positioning component (2), a fixing component (3) and a power component (4). The base body (1) is a rectangular plate structure made of aluminum alloy or cast iron. The upper surface of the base body (1) is milled to form a flat mounting surface. The positioning component (2) is disposed on the upper surface of the base body (1). The positioning component (2) includes at least two positioning pins (21) and at least two positioning blocks (22). The positioning pins (21) are vertically fixed on the upper surface of the base body (1). The axis of the positioning pins (21) is perpendicular to the upper surface of the base body (1). The positioning blocks (22) are disposed on one side of the positioning pins (21). The positioning blocks (22) are movable in a direction parallel to the upper surface of the base body (1). The fixing component (3) includes at least two sets of fixing blocks (31). The fixing blocks (31) are fixed on the upper surface of the base body (1). The fixing blocks (31) and the positioning blocks (22) are located on opposite sides of the injection molding blank (5). The side of the fixing block (31) facing the injection molding blank (5) is in contact with the outer wall of the injection molding blank (5). The power assembly (4) includes an air nozzle (41), which is fixedly installed on the side or bottom of the base body (1). The air nozzle (41) is used to connect to a pressure source or a vacuum source. The air nozzle (41) is connected to the positioning assembly (2) or the fixing assembly (3) through the internal air passage (11).

2. The laser cutting fixture for injection molding green gates according to claim 1, characterized in that, The positioning pin (21) includes an integrally formed pin body and a connecting part. The top of the pin body is set as a tapered guide section with a taper of 1:5 to 1:

10. An elastic buffer sleeve is fitted on the outer side of the middle part of the pin body. The elastic buffer sleeve is made of silicone, fluororubber or EPDM rubber and has a thickness of 0.5mm to 2mm.

3. The laser cutting fixture for injection molding green gates according to claim 1, characterized in that, The number of the air nozzles (41) is at least one. The air inlet of the air nozzle (41) is connected to an external air pressure source through a high-pressure air pipe. The air outlet of the air nozzle (41) is connected to an air passage (11) opened inside the base body (1). The air passage (11) extends along the thickness or length direction of the base body (1). The end of the air passage (11) is connected to a piston chamber (14). The piston chamber (14) is opened inside the base body (1) and located below the positioning block (22). The axis of the piston chamber (14) is parallel to the moving direction of the positioning block (22).

4. The laser cutting fixture for injection molding green gates according to claim 1, characterized in that, The fixing block (31) includes a block body (311), the material of which is the same as that of the base body (1). The upper half of the block body (311) is provided with a waist-shaped adjustment hole (312). The length of the waist-shaped adjustment hole (312) extends in a horizontal direction perpendicular to the moving direction of the positioning block (22). The width of the waist-shaped adjustment hole (312) is slightly larger than the diameter of the locking bolt passing through it. The block body (311) is fixedly connected to the base body (1) by the locking bolt. The screw part of the locking bolt passes through the waist-shaped adjustment hole (312) and is threaded into the threaded hole on the base body (1). An anti-slip pad is provided between the head of the locking bolt and the upper surface of the block body (311). The anti-slip pad is a rubber pad or a metal toothed pad to prevent the locking bolt from loosening.

5. The laser cutting fixture for injection molding green gates according to claim 1, characterized in that, The positioning pin (21), positioning block (22) and fixing block (31) are all provided with a flexible protective coating on the surface that is in direct contact with the injection molding preform (5). The thickness of the flexible protective coating is 0.1 mm to 0.5 mm, and the material of the flexible protective coating is polytetrafluoroethylene, modified epoxy resin or ethylene-vinyl acetate copolymer.

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