Shearing structure for cutting stub bar in mold and injection molding equipment

Abstract

The invention discloses a shearing structure for cutting stub bars in a mold and injection molding equipment, and relates to the technical field of injection molding of automobile parts, and the shearing structure for cutting stub bars in the mold comprises a lower mold base; an injection molding cavity is formed after the upper mold base and the lower mold base are assembled; the cutting component comprises a driving assembly and at least one group of cutting assemblies, the driving assembly is arranged on the lower die holder and comprises at least one telescopic driving rod, the cutting assemblies are arranged on the upper die holder and comprise cutting pieces, the cutting pieces are configured to slide, and after the upper die holder and the lower die holder are closed, the cutting pieces are arranged on the lower die holder. The cutting part is partially located on the wall face of the junction of the injection molding runner and the injection molding cavity, the cutting part of the cutting part is located in the injection molding runner, and the driving rod can stretch to push the cutting part so that the cutting part can move to separate the injection molding runner from the injection molding cavity. According to the waste head cutting device, waste heads can be cut in the mold base after injection molding is completed, the waste heads do not need to be manually removed subsequently, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of automobile parts injection molding, and in particular to a shearing structure and injection molding equipment for cutting a material head in a mold. Background Art

[0002] Automobile trims are all used for injection molding by injection molding equipment. Injection molding will inevitably leave injection molding waste heads on the molded products. Currently, the molded products are taken out of the mold after injection molding and then the waste heads are removed. However, such operation will not only add an extra process, but the increase in processes will easily affect production efficiency. At the same time, in order to speed up the removal of the waste heads, additional waste head removal equipment needs to be developed, which has high research and development costs. Summary of the invention

[0003] The present application aims to solve one of the above-mentioned technical problems in the prior art. To this end, the present application embodiment provides a shearing structure for cutting a material head in a mold.

[0004] The embodiment of the present application also provides an injection molding device.

[0005] According to an embodiment of the first aspect of the present application, a shearing structure for in-mold cutting of a material head is provided, comprising a lower mold base; an upper mold base, wherein the upper mold base and the lower mold base are molded together to form an injection cavity; a cutting component, comprising a driving component and at least one group of cutting components, wherein the driving component is arranged on the lower mold base, the driving component comprises at least one retractable driving rod, the cutting component is arranged on the upper mold base, the cutting component comprises a cutting piece, and the cutting piece is configured to be able to slide, after the upper mold base and the lower mold base are molded together, part of the cutting piece is located on the wall surface where the injection channel and the injection cavity meet, the cutting portion of the cutting piece is located in the injection channel, and the driving rod can extend to push the cutting piece so that the cutting portion can move to separate the injection channel from the injection cavity.

[0006] The above-mentioned shearing structure for cutting the waste head in the mold has at least the following beneficial effects: the present application realizes the waste head generated by cutting injection molding in the mold cavity by adding a cutting component, and there is no need to remove the waste head after opening the mold and taking out the product. Specifically, the cutting component is arranged on the upper mold base, and the cutting piece of the cutting component is arranged to be able to slide, and the driving component is arranged on the lower mold base. When the upper mold base and the lower mold base are molded, part of the cutting piece is arranged to be located at the wall surface where the injection runner and the injection cavity meet, and the cutting part of the cutting piece is located in the injection runner. After the injection molding is completed, the cutting piece is pushed to move by the retractable driving rod, so that the cutting part can move to separate the injection runner from the injection cavity, thereby completing the rapid removal of the waste head adhered to the edge of the molded product. At the same time, the separate design of the cutting component and the driving component does not require the design to be complicated due to the entire cutting component being separately arranged on the lower mold base or the upper mold base. The space at the injection molding runner is effectively utilized, which makes the design of the cutting component simple and does not require major modifications or redesigns to the original upper mold base or the lower mold base, thereby greatly reducing the transformation cost and achieving improved production efficiency at a lower cost.

[0007] According to the shearing structure of the in-mold cutting head described in the embodiment of the first aspect of the present application, a slope is provided on the side of the cutting portion facing the injection flow channel so that the cutting portion forms a cutting edge.

[0008] According to the shearing structure of the in-mold cutting head described in the embodiment of the first aspect of the present application, the inclination angle of the inclined surface is set to 30°~60°.

[0009] According to the shearing structure of the in-mold cutting head described in the embodiment of the first aspect of the present application, the cutting piece includes a first section and a second section, the cutting portion is arranged in the first section, and the ratio of the thickness of the first section to the thickness of the second section is less than or equal to 0.5.

[0010] According to the shearing structure of the in-mold cutting head described in the embodiment of the first aspect of the present application, the cutting assembly also includes a mounting seat, the mounting seat includes a guide portion, the guide portion is provided with a groove adapted to the second section, the guide portion is also provided with a limiting member for guiding the first section, the first section is inserted into the limiting member, and the matching clearance between the first section and the limiting member is 0.01-0.02mm.

[0011] According to the shearing structure of the in-mold cutting head described in the embodiment of the first aspect of the present application, the cutting component also includes a rebound piece, and the cutting piece has a tendency to move in a direction away from the injection molding runner under the action of the rebound piece.

[0012] According to the shearing structure of the in-mold cutting head described in the embodiment of the first aspect of the present application, the cutting assembly also includes a first transmission member, which is slidably arranged in a sliding cavity inside the mounting seat, and the second section is fixed to the first transmission member, and one end of the rebound member abuts the sliding cavity, and the other end abuts the first transmission member for fixing a side of the second section.

[0013] According to the shearing structure of the in-mold cutting head described in the embodiment of the first aspect of the present application, the cutting assembly also includes a second transmission member, which is arranged in the sliding cavity, and a portion of the second transmission member can extend out of the mounting seat, and the second transmission member is used to dock with the driving rod.

[0014] According to the shearing structure of the in-mold cutting head described in the embodiment of the first aspect of the present application, the cutting assembly also includes a fixing part, which forms the sliding cavity after cooperating with the mounting seat, and the portion of the second transmission member with a smaller diameter is inserted into the fixing part, and the portion of the second transmission member with a larger diameter is located in the sliding cavity and abuts against the first transmission member.

[0015] According to an embodiment of the second aspect of the present application, there is provided an injection molding device, comprising the above-mentioned shearing structure for cutting the material head in the mold.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present application is further described below in conjunction with the accompanying drawings and embodiments;

[0018] Figure 1 This is a schematic diagram of the shearing structure of the in-mold cutting head of the embodiment of the present application. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the shearing structure of the in-mold cutting head of the embodiment of the present application. Figure 2 ;

[0020] Figure 3 This is a schematic diagram of the shearing structure of the in-mold cutting head in the embodiment of the present application. Figure 3 ;

[0021] Figure 4 This is a schematic diagram of the connection between the mounting base, the fixing member and the limiting member in the embodiment of the present application. Figure 1 ;

[0022] Figure 5 This is a schematic diagram of the connection between the mounting base, the fixing member and the limiting member in the embodiment of the present application. Figure 2 ;

[0023] Figure 6 It is a schematic diagram of the connection between the cutting member, the first transmission member, and the second transmission member in an embodiment of the present application;

[0024] Figure 7 is a schematic diagram of the connection between the cutting member and the first transmission member in an embodiment of the present application;

[0025] Figure 8 It is a schematic diagram of the structure of the cutting piece in an embodiment of the present application.

[0026] Figure markings: lower mold base 100, first injection groove 110, driving member 120, driving plate 130, cutting member 200, driving rod 210, second transmission member 220, fixing member 230, mounting seat 240, guide portion 241, first transmission member 250, limiting hole 251, slot 252, cutting member 260, limiting protrusion 261, second section 262, first section 263, inclined surface 264, limiting member 270, rebound member 280, injection molded product 300, waste head 310. DETAILED DESCRIPTION

[0027] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0028] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0031] Waste heads 310 are inevitable for injection molded products 300. Most of the existing methods of removing waste heads 310 are to remove them manually after injection molding. Manual removal has high labor costs on one hand, and incomplete removal leads to defective rates on the other hand. Manual removal requires an additional removal step on the production line to remove the waste heads 310, which greatly reduces production efficiency.

[0032] Although there is a solution to remove the waste head 310 in the mold by redesigning the cutting structure, due to the immature design, the modification cost is huge, and there is no better modification solution, so finally it has to return to the manual removal method.

[0033] To solve the problem of removing the waste head 310 of the injection molded product 300, refer to Figures 1 to 3 The embodiment of the present application provides a shearing structure for in-mold cutting of a material head, and the shearing structure for in-mold cutting of a material head includes a lower mold base 100, an upper mold base and a cutting component 200.

[0034] Specifically, an injection cavity is formed after the upper mold base and the lower mold base 100 are molded together. A first injection groove 110 is provided on one side of the lower mold base 100 for injection, and a second injection groove is provided on one side of the upper mold base for injection. After the mold is molded together, the first injection groove 110 and the second injection groove form an injection cavity, and an injection channel is provided at the edge of the injection cavity, which is used for conveying and pouring the injection liquid.

[0035] Among them, the cutting component 200 includes a driving component and at least one group of cutting components, the driving component is arranged on the lower mold base 100, the driving component includes at least one retractable driving rod 210, the cutting component is arranged on the upper mold base, the cutting component includes a cutting piece 260, and the cutting piece 260 is configured to be able to slide. After the upper mold base and the lower mold base 100 are molded, part of the cutting piece 260 is located on the wall where the injection channel and the injection cavity meet, and the cutting part of the cutting piece 260 is located in the injection channel. After the injection molding is completed, the driving rod 210 can extend to push the cutting piece 260, and the retractable driving rod 210 pushes the cutting piece 260 to move, so that the cutting part can move to separate the injection channel from the injection cavity, thereby completing the rapid removal of the waste head 310 bonded to the edge of the molded product.

[0036] The present application realizes the cutting of the waste head 310 generated by injection molding in the mold cavity by adding a cutting component 200, and there is no need to remove the waste head 310 after opening the mold and taking out the product. At the same time, because the side of the upper mold base and the lower mold base 100 used for injection molding is not a simple planar structure, it has more concave and matching, and Figure 1As shown, there is a situation where part of the upper mold base is embedded in the lower mold base 100. Therefore, if the entire cutting component 200 is set separately on the upper mold base or the lower mold base 100, it is necessary to consider whether it will interfere with the mold clamping. In order to avoid the mold clamping situation, it is necessary to do an avoidance design or redesign the structure of the mold. The cutting component and the driving component are designed separately. On the one hand, there is no need to complicate the design due to the entire cutting component 200 being set separately on the lower mold base 100 or the upper mold base. The space at the injection runner is effectively utilized, so that the design of the cutting component 200 is simple, and there is no need to make major modifications or redesigns to the original upper mold base or the lower mold base 100, which greatly reduces the transformation cost and achieves an improvement in production efficiency at a lower cost.

[0037] In some specific embodiments, if an injection molded product 300 has multiple waste heads 310, the number of cutting components set corresponds to the number of waste heads 310, and the number of driving rods 210 set corresponds to the number of cutting components set, so that the waste heads 310 of the injection molded product 300 can be removed from the mold at one time, thereby simplifying the production of the injection molded product 300 and improving production efficiency.

[0038] In some embodiments, the present application sets the driving assembly on the lower die base 100. Specifically, the driving assembly is set on the outer side of the lower die base 100. The driving assembly also includes a driving plate 130 and a driving member 120. The driving member 120 is used to provide driving force, and the driving plate 130 is used to drive multiple driving rods 210 to move simultaneously. Specifically, the driving plate 130 is slidably set on the outer side of the lower die base 100 through a guide rod, the driving member 120 is an oil cylinder, the oil cylinder is fixed to the driving plate 130, the oil cylinder rod of the oil cylinder is fixed to the lower die base 100, one end of the driving rod 210 is fixed to the driving plate 130, and the other end of the driving rod 210 is inserted into the lower die base 100.

[0039] When the upper mold base and the lower mold base 100 are molded, the cutting assembly moves into place, so that the cutting piece 260 is on the movement path of the driving rod 210, and the driving rod 210 is used to drive the cutting assembly located between the lower mold base 100 and the upper mold base. The driving rod 210 increases the transmission arm to achieve effective force transmission. The overall structural design is simple, and the addition of the cutting component 200 also avoids the mold interference between the upper mold base and the lower mold base 100. Compared with setting the driving piece 120 inside the lower mold base 100, the space occupied by the driving assembly can be greatly reduced, and there is no need to significantly modify the design of the surface of the lower mold base 100 used for injection molding, thereby reducing the modification cost.

[0040] In order to ensure that the additional cutting components do not occupy too much space, the present application optimizes the structure of the cutting piece 260, wherein, Figure 8As shown, the cutting piece 260 includes a first section 263 and a second section 262 , the cutting portion is disposed at the first section 263 , and the ratio of the thickness of the first section 263 to the thickness of the second section 262 is less than or equal to 0.5.

[0041] The first section 263 and the second section 262 of different thicknesses enable the overall length of the cutting piece 260 to be long enough and have sufficient rigidity. In the embodiment of the present application, the ratio of the thickness of the first section 263 to the thickness of the second section 262 is equal to 0.5. The thickness of the first section 263 close to the injection cavity is made smaller, so that when an adaptive design is made on the upper mold base or the lower mold base 100, the space occupied by the entire cutting assembly can be reduced, and the cavity wall of the injection cavity is prevented from being too thin to affect the forming of the product.

[0042] In some embodiments, such as Figures 3 to 6 As shown, the cutting assembly also includes a mounting seat 240, which serves as a mounting reference for the remaining parts of the cutting assembly, and the mounting seat 240 is fixed to the upper mold base. The mounting seat 240 includes a guide portion 241, and the guide portion 241 is provided with a groove adapted to the second section 262. The cross-sectional area of ​​the guide portion 241 gradually decreases from one end away from the injection cavity to the other end, which can reduce the impact on injection molding. The closer the position on the mold base is to the injection cavity, the more difficult it is to hollow out or groove the position. The design of the above-mentioned guide portion 241 can reduce the design difficulty, and can also ensure the strength of the cavity wall of the injection cavity, and ensure that there will be no glue overflow.

[0043] The groove serves as a guide. Since the second section 262 is designed to be too long, it can also prevent the second section 262 from bending due to long-term high-intensity repeated shearing, which affects the cutting accuracy.

[0044] Furthermore, the guide portion 241 is also provided with a stopper 270 for guiding the first section 263, the first section 263 is inserted into the stopper 270, and the clearance between the first section 263 and the stopper 270 is 0.01-0.02mm. The stopper 270 is arranged at a position close to the injection molding runner of the guide portion 241, and the first section 263 is guided by the stopper 270, so as to ensure that the cutting portion is effectively supported and guided, and avoid the bending of the first section 263 due to long-term high-intensity repeated shearing, which affects the cutting accuracy. In addition, by matching the clearance between the stopper 270 and the first section 263, and setting the clearance between the first section 263 and the stopper 270 to 0.01-0.02mm, it is possible to effectively avoid the glue liquid transported by the injection molding runner from overflowing from the clearance between the first section 263 and the stopper 270, which affects the injection pressure.

[0045] In some embodiments, the cutting assembly further includes a resilient piece 280, and the cutting piece 260 has a tendency to move in a direction away from the injection molding flow channel under the action of the resilient piece 280. During injection molding, the cutting piece 260 moves under the action of the driving rod 210 and separates the injection molding cavity from the injection molding flow channel. During this process, the resilient piece 280 is compressed. When the shearing of the waste head 310 is completed, the driving rod 210 returns to its original position, the force driving the cutting piece 260 to move disappears, the elastic potential energy of the resilient piece 280 is released, and the cutting piece 260 is driven back to its original position, and the injection molding cavity is connected to the injection molding flow channel, so that after one mold closing is completed, the cutting piece 260 can return to its original position without affecting the injection molding operation after the next mold closing.

[0046] In some specific embodiments, the cutting assembly further includes a first transmission member 250, which is slidably disposed in a sliding cavity inside the mounting seat 240, and the sliding cavity is used to guide the first transmission member 250 and limit the sliding range of the first transmission member 250, thereby being able to accurately control the moving range of the cutting portion. Specifically, the channel is connected to the sliding cavity, the second section 262 is fixed to the first transmission member 250, one end of the rebound member 280 abuts against the cavity wall of the channel connected to the sliding cavity, and the other end abuts against the side of the first transmission member 250 to which the second section 262 is fixed.

[0047] When cutting the waste head 310, the driving rod 210 pushes the first transmission member 250 to slide in the sliding cavity, and the first transmission member 250 approaches the channel and drives the cutting member 260 to perform the cutting operation, while compressing the resilient member 280. When the cutting is completed and the driving rod 210 returns to its original position, the elastic potential energy of the resilient member 280 is released and drives the first transmission member 250 to return to its original position, thereby driving the cutting member 260 fixed to the first transmission member 250 to return to its original position. The setting of the first transmission member 250 can gather the force of the driving rod 210 and accurately push the cutting member 260 along the movement direction of the cutting member 260.

[0048] In some embodiments, the cutting assembly further includes a second transmission member 220 , which is disposed in the sliding cavity. A portion of the second transmission member 220 can extend out of the mounting seat 240 , and the second transmission member 220 is used to dock with the driving rod 210 .

[0049] In the case where the cutting member 200 is designed to be separated from the driving assembly, Figure 6 As shown, the force is effectively and accurately applied to the cutting piece 260 through the first transmission member 250, and then the effective transmission of force is achieved through the cooperation of the second transmission member 220 and the driving rod 210. The design is simple and does not occupy much design space in the mold base. The second transmission member 220 and the driving rod 210 are designed to be separated, and the second transmission member 220 can move to the movement path of the driving rod 210, thereby avoiding the transmission structure interfering with the mold closing of the mold base.

[0050] In some specific embodiments, the cutting assembly further includes a fixing member 230, which forms a sliding cavity after being matched with the mounting seat 240, and the portion of the second transmission member 220 with a smaller diameter is inserted into the fixing member 230, and the portion of the second transmission member 220 with a larger diameter is located in the sliding cavity and abuts against the first transmission member 250. Specifically, the second transmission member 220 is cylindrical, and the cylinder has a first portion with a larger diameter and a second portion with a smaller diameter, the first portion is in the sliding cavity, the second portion is inserted into the fixing member 230, and the second portion is used to abut against the driving rod 210, so that the first transmission member 250 can be pushed to slide through the second portion to complete the driving of the cutting member 260.

[0051] The fixing member 230 and the mounting seat 240 are arranged to be detachable, which is convenient for the forming of the sliding cavity on the one hand, and is convenient for the processing of the groove and part of the internal structure on the other hand, and is also convenient for subsequent maintenance.

[0052] In some specific embodiments, a bevel 264 is provided on the side of the cutting portion facing the injection molding flow channel so that the cutting portion forms a cutting edge. In order to effectively remove the waste head 310 and make the surface of the injection molding product 300 complete, the cutting portion cuts along the wall of the injection molding cavity, separates the injection molding cavity from the injection molding flow channel, and removes the waste head 310 at the junction of the injection molding cavity and the injection molding flow channel through the cutting edge.

[0053] To achieve a better shearing effect, the inclination angle of the inclined surface 264 is set to 30° to 60°. In one embodiment of the present application, the inclination angle of the inclined surface 264 is set to 45°, and the width of the cutting blade is greater than the diameter of the injection runner.

[0054] In some specific embodiments, Figure 7 and Figure 8 As shown, the end of the second section 262 of the cutting piece 260 has a limiting protrusion 261 so that the end of the second section 262 is an L-shaped structure, and the first transmission member 250 is provided with a slot 252 that matches the L-shaped structure. After the L-shaped structure is locked in the slot 252, the cutting piece 260 and the first transmission member 250 are connected.

[0055] In some embodiments, the resilient member 280 is a spring, and the first transmission member 250 is provided with a limiting hole 251 for limiting the spring.

[0056] The embodiment of the present application also provides an injection molding device having the above-mentioned shearing structure for cutting the waste head in the mold. The injection molding device can achieve cutting of the waste head 310 in the mold base after the injection molding is completed, and there is no need for manual removal of the waste head 310 subsequently, which greatly improves production efficiency.

[0057] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A shearing structure for cutting material in a mold, characterized in that: include Lower die seat; An upper mold base, wherein the upper mold base and the lower mold base are molded together to form an injection cavity; The cutting component includes a driving component and at least one group of cutting components, wherein the driving component is arranged on the lower mold base, the driving component includes at least one retractable driving rod, the cutting component is arranged on the upper mold base, the cutting component includes a cutting piece, and the cutting piece is configured to be able to slide. After the upper mold base and the lower mold base are molded together, part of the cutting piece is located on the wall where the injection channel and the injection cavity meet, and the cutting part of the cutting piece is located in the injection channel. The driving rod can extend to push the cutting piece so that the cutting part can move to separate the injection channel from the injection cavity.

2. The shearing structure for in-mold cutting of material head according to claim 1, characterized in that: A slope is arranged on one side of the cutting portion facing the injection flow channel so that the cutting portion forms a cutting edge.

3. The shearing structure for cutting material in the mold according to claim 2, characterized in that: The inclination angle of the inclined surface is set to 30° to 60°.

4. The shearing structure for in-mold cutting of material according to any one of claims 1 to 3, characterized in that: The cutting piece includes a first section and a second section, the cutting portion is arranged at the first section, and a ratio of a thickness of the first section to a thickness of the second section is less than or equal to 0.

5.

5. The shearing structure for cutting material in the mold according to claim 4, characterized in that: The cutting assembly also includes a mounting seat, which includes a guide portion, the guide portion is provided with a groove adapted to the second section, the guide portion is also provided with a limiter for guiding the first section, the first section is inserted into the limiter, and the matching clearance between the first section and the limiter is 0.01-0.02mm.

6. The shearing structure for cutting material in a mold according to claim 5, characterized in that: The cutting component further comprises a resilient member, and under the action of the resilient member, the cutting member has a tendency to move in a direction away from the injection flow channel.

7. The shearing structure for cutting material in a mold according to claim 6, characterized in that: The cutting assembly also includes a first transmission member, which is slidably arranged in a sliding cavity inside the mounting seat, and the second section is fixed to the first transmission member. One end of the rebound member abuts the sliding cavity, and the other end abuts the first transmission member for fixing a side of the second section.

8. The shearing structure for cutting material in a mold according to claim 7, characterized in that: The cutting assembly further comprises a second transmission member, which is arranged in the sliding cavity, a portion of which can extend out of the mounting seat, and the second transmission member is used for docking with the driving rod.

9. The shearing structure for cutting material in a mold according to claim 8, characterized in that: The cutting assembly also includes a fixing member, which cooperates with the mounting seat to form the sliding cavity, the smaller diameter portion of the second transmission member is inserted into the fixing member, and the larger diameter portion of the second transmission member is located in the sliding cavity and abuts against the first transmission member.

10. An injection molding device, characterized in that: A shearing structure comprising the in-mold cutting head as described in any one of claims 1 to 9.

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