A cutting structure for in-mold trimming of flash and injection molding apparatus

Abstract

The application discloses a shearing structure of a material head in a mold and injection equipment, and relates to the technical field of automobile part injection molding. The shearing structure of the material head in the mold comprises a lower mold base, an upper mold base, a shearing component, and at least one set of shearing assemblies. The upper mold base and the lower mold base form an injection cavity after being closed. The shearing component comprises a driving assembly and at least one set of shearing assemblies. The driving assembly is arranged on the lower mold base and comprises at least one telescopic driving rod. The shearing assembly is arranged on the upper mold base and comprises a shearing piece. The shearing piece is configured to be slidable. After the upper mold base and the lower mold base are closed, part of the shearing piece is located on the wall surface at the joint of the injection runner and the injection cavity, and the shearing part of the shearing piece is located in the injection runner. The driving rod can be extended to push against the shearing piece, so that the shearing part can be moved to separate the injection runner from the injection cavity. The application can realize the shearing of the waste material head in the mold base after the completion of injection molding, and the subsequent removal of the waste material head does not require manual operation, thereby greatly improving the production efficiency.

Description

Technical Field

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

[0002] Automobile trim strips are all injection molded 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 not only adds an extra process, but the increase in process is likely to affect production efficiency. At the same time, in order to speed up the removal of waste heads, additional waste head removal equipment needs to be developed, which has high R&D 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, an embodiment of the present application provides a shearing structure for cutting a material head in a mold.

[0004] An 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 an in-mold cutting 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, and 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 runner and the injection cavity meet, and the cutting portion of the cutting piece is located in the injection runner, and the driving rod can extend to push the cutting piece so that the cutting portion can move to separate the injection runner from the injection cavity.

[0006] The above-mentioned shearing structure of the in-mold cutting head has at least the following beneficial effects: the present application realizes the cutting of the waste head generated by injection molding in the mold cavity by adding a cutting component, and there is no need to open the mold and take out the product before removing the waste head. Specifically, the cutting component is set on the upper mold base, and the cutting piece of the cutting component is set to be able to slide, and the driving component is set on the lower mold base. When the upper mold base and the lower mold base are closed, part of the cutting piece is set to be located at the wall where the injection runner and the injection cavity meet, and the cutting part of the cutting piece is 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 and 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 entire cutting component to be separately set on the lower mold base or the upper mold base, which makes the design complicated. It effectively utilizes the space at the injection molding runner, makes the cutting component design simple, and does not require major modifications or redesigns to the original upper mold base or the lower mold base, 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 molding runner 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° to 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 fitting 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. One end of the rebound member abuts the sliding cavity, and the other end abuts the first transmission member for fixing the 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 smaller diameter part of the second transmission part is inserted into the fixing part, and the larger diameter part of the second transmission part is located in the sliding cavity and abuts the first transmission part.

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

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

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

[0018] Figure 1 This is a schematic diagram of the shearing structure of the in-mold cutting head in 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 in 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 is a connection schematic diagram of the cutting member, the first transmission member and the second transmission member in the embodiment of the application;

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

[0025] Figure 8 is a structure schematic diagram of the cutting member in the embodiment of the application.

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

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

[0028] In the description of the application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the application.

[0029] In the description of the application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than and the like are not included in the number, above, below, within and the like are included in the number. If it is described as first, 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 indicated technical features or implicitly indicating the sequence of indicated technical features.

[0030] In the description of the application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the application in combination with the specific content of the technical scheme.

[0031] The waste head 310 is inevitable for the injection molding product 300, and the existing way to remove the waste head 310 is still mostly manual removal after injection molding. Manual removal has high labor cost and incomplete removal leads to high defective rate. In addition, manual removal requires an additional removal work on the production line, which greatly slows down the production efficiency.

[0032] Although there is also a scheme to remove the waste head 310 in the mold by redesigning the cutting structure, the design is not mature, the modification cost is huge, there is no better modification scheme, and finally it returns to the manual removal way.

[0033] To solve the problem of removing the waste head 310 of the injection molding product 300, with reference to Figures 1 to 3 The embodiment of the present application provides a cutting structure for cutting the waste head in the mold, which comprises a lower mold base 100, an upper mold base and a cutting member 200.

[0034] Specifically, the upper mold base and the lower mold base 100 form an injection molding cavity after clamping, the lower mold base 100 is provided with a first injection molding groove 110 on the side for injection, and the upper mold base is provided with a second injection molding groove on the side for injection. The first injection molding groove 110 and the second injection molding groove form an injection molding cavity after clamping, and the edge position of the injection molding cavity has an injection flow channel for conveying and pouring the injection liquid.

[0035] The cutting member 200 comprises a driving assembly and at least one cutting assembly, the driving assembly is arranged on the lower mold base 100, the driving assembly comprises at least one telescopic driving rod 210, the cutting assembly is arranged on the upper mold base, the cutting assembly comprises a cutting piece 260, the cutting piece 260 is configured to be slidable, after the upper mold base and the lower mold base 100 are clamped, part of the cutting piece 260 is located at the wall surface at the joint of the injection flow channel and the injection molding cavity, the cutting part of the cutting piece 260 is located in the injection flow channel, after the injection is completed, the driving rod 210 can be extended to push against the cutting piece 260, and the cutting part can be moved to cut off the injection flow channel and the injection molding cavity by the telescopic driving rod 210 pushing the cutting piece 260 to move, so as to complete 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 the cutting member 200, without opening the mold to take out the product and then removing the waste head 310. At the same time, the side for injection of the upper mold base and the lower mold base 100 is not a simple plane structure, but has more recesses and cooperations, and as 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 evasive 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 because the entire cutting component 200 is set separately on the lower mold base 100 or the upper mold base. The space at the injection runner is effectively utilized, making the design of the cutting component 200 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, simplifying the production of the injection molded product 300 and improving production efficiency.

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

[0039] When the upper and lower mold bases 100 are closed, the cutting assembly moves into position, placing the cutting piece 260 in the motion path of the drive rod 210. The drive rod 210 drives the cutting assembly located between the lower and upper mold bases 100. By extending the transmission arm through the drive rod 210, effective force transmission is achieved. The overall structural design is simple and avoids the impact of the addition of the cutting member 200 on the mold closing between the upper and lower mold bases 100. Compared to arranging the drive member 120 inside the lower mold base 100, the space occupied by the drive assembly can be greatly reduced. There is no need to significantly modify the design of the surface of the lower mold base 100 used for injection molding, thus reducing modification costs.

[0040] In order to make the additional cutting components not take up 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 provided in 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] By varying the thickness of the first and second sections 263, 262, the trimming element 260 can be made sufficiently long and rigid. 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 0.5. The thickness of the first section 263 is reduced near the injection cavity, allowing for adaptive design of the upper or lower mold base 100 to reduce the space occupied by the trimming assembly, thus preventing the injection cavity wall from being too thin, which could affect the product's formation.

[0042] In some embodiments, such as Figures 3 to 6 As shown, the cutting assembly further includes a mounting base 240, which serves as a mounting base for the remaining components of the cutting assembly and is fixed to the upper mold base. The mounting base 240 includes a guide portion 241, which is provided with a groove adapted to fit 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, thereby reducing the impact on injection molding. The closer to the injection cavity on the mold base, the more difficult it is to hollow out or groove the mold base. The design of the guide portion 241 can reduce the design difficulty and ensure the strength of the cavity wall of the injection cavity, ensuring that glue overflow does not occur.

[0043] The groove serves as a guide on one hand. 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 limiter 270 for guiding the first section 263. The first section 263 is inserted into the limiter 270, and the clearance between the first section 263 and the limiter 270 is 0.01-0.02mm. The limiter 270 is provided at a position near the injection molding runner of the guide portion 241. The first section 263 is guided by the limiter 270 to ensure effective support and guidance at the cutting portion, thereby avoiding bending of the first section 263 due to long-term high-intensity repeated shearing, which affects the cutting accuracy. In addition, by ensuring the clearance between the limiter 270 and the first section 263 and setting the clearance between the first section 263 and the limiter 270 to 0.01-0.02mm, it is possible to effectively prevent the glue liquid transported by the injection molding runner from overflowing from the clearance between the first section 263 and the limiter 270, thereby affecting the injection pressure.

[0045] In some embodiments, the cutting assembly further includes a rebound piece 280, and the cutting piece 260 has a tendency to move in a direction away from the injection molding runner under the action of the rebound piece 280. During injection molding, the cutting piece 260 moves under the action of the drive rod 210 and separates the injection molding cavity from the injection molding runner. During this process, the rebound piece 280 is compressed. When the shearing of the waste head 310 is completed, the drive rod 210 returns to its original position, the force driving the cutting piece 260 to move disappears, the elastic potential energy of the rebound piece 280 is released, and the cutting piece 260 is driven back to its original position. The injection molding cavity is connected to the injection molding runner, 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 within the mounting seat 240. The sliding cavity is used to guide the first transmission member 250 and limit the sliding range of the first transmission member 250, thereby accurately controlling the movement range of the cutting portion. Specifically, a channel is connected to the sliding cavity, and 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 connecting the sliding cavity, and the other end abuts against the side of the first transmission member 250 for fixing the second section 262.

[0047] When cutting the waste head 310, the drive rod 210 pushes the first transmission member 250 to slide within the sliding cavity. The first transmission member 250 approaches the groove and drives the cutting member 260 to perform the cutting operation, while compressing the resilient member 280. When cutting is completed and the drive 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 back to its original position, thereby driving the cutting member 260 fixed to the first transmission member 250 back to its original position. The arrangement of the first transmission member 250 can collect the force of the drive rod 210 and accurately apply the force along the direction of movement of the cutting member 260 to push against 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. Part 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, as shown in FIG. 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 comprises a fixing member 230, which forms a sliding cavity in cooperation with the mounting base 240. The second transmission member 220 is inserted into the fixing member 230 at a smaller diameter portion, and the larger diameter portion of the second transmission member 220 is located in the sliding cavity and abuts against the first transmission member 250. Specifically, the second transmission member 220 is a columnar shape, which has a first portion with a larger diameter and a second portion with a smaller diameter. The first portion is located in the sliding cavity, and the second portion is inserted into the fixing member 230. The second portion is used to abut against the driving rod 210, so as to push the first transmission member 250 to slide and drive the cutting member 260.

[0051] The fixing member 230 and the mounting base 240 are detachable, which facilitates the formation of the sliding cavity, the machining of the channel and part of the internal structure, and the subsequent maintenance.

[0052] In some specific embodiments, a slope 264 is arranged on the side of the cutting portion facing the injection flow channel, so as to form a cutting edge of the cutting portion. In order to effectively remove the waste head 310 and make the surface of the injection product 300 complete, the cutting portion is cut along the wall surface direction close to the injection cavity, and the injection cavity is separated from the injection flow channel. The waste head 310 at the joint of the injection cavity and the injection flow channel is removed by the cutting edge.

[0053] In order to achieve better shearing effect, the inclination angle of the slope 264 is set to 30°-60°. In one of the embodiments of the present application, the inclination angle of the slope 264 is set to 45°, and the width of the cutting edge is greater than the diameter of the injection flow channel.

[0054] In some specific embodiments, as shown in Figure 7 and Figure 8 The end of the second section 262 of the cutting member 260 is provided with a limiting protrusion 261, so that the end of the second section 262 is in an L-shaped structure. The first transmission member 250 is provided with a clamping groove 252 matched with the L-shaped structure. After the L-shaped structure is clamped in the clamping groove 252, the connection between the cutting member 260 and the first transmission member 250 is achieved.

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

[0056] The embodiments of the present application also provide an injection molding equipment with the shearing structure of the in-mold cutting waste head, which can realize the cutting of the waste head 310 in the mold base after the injection molding is completed, and the subsequent removal of the waste head 310 does not need manual operation, which greatly improves the 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. Various changes can be made within the scope of knowledge possessed by 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 by: include Lower die base; An upper mold base, wherein the upper mold base and the lower mold base are combined to form an injection cavity; The cutting component includes a driving assembly and at least one group of cutting assemblies, wherein the driving assembly is arranged on the lower mold base, the driving assembly includes at least one retractable driving rod, the cutting assembly is arranged on the upper mold base, the cutting assembly 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, a portion of the cutting piece is located on the wall surface where the injection runner and the injection cavity meet, and the cutting portion of the cutting piece is located in the injection runner. The driving rod can extend to push against the cutting piece, so that the cutting portion can move to separate the injection runner from the injection cavity. In which, the cutting piece includes a first section and a second section, the cutting part is arranged on the first section, the cutting assembly also includes a mounting seat, the mounting seat includes a guide part, the guide part is provided with a groove adapted to the second section, the guide part is also provided with a limiting part for guiding the first section, the first section is inserted into the limiting part, and the cutting assembly also includes a rebound part, and the cutting piece has a tendency to move in a direction away from the injection molding runner under the action of the rebound part.

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

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

4. The shearing structure for in-mold cutting of a material head according to any one of claims 1 to 3, characterized in that: A ratio of the thickness of the first segment to the thickness of the second segment is less than or equal to 0.

5.

5. The shearing structure for in-mold cutting of material according to claim 4, characterized in that: The matching clearance between the first section and the limiting member is 0.01-0.02 mm.

6. The shearing structure for in-mold cutting of a material head according to claim 5, 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.

7. The shearing structure for in-mold cutting of a material head according to claim 6, characterized in that: The cutting assembly further includes a second transmission member, which is disposed in the sliding cavity. 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.

8. The shearing structure for in-mold cutting of a material head according to claim 7, characterized in that: The cutting assembly also includes a fixing member, which forms the sliding cavity when the fixing member cooperates with the mounting seat. 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.

9. An injection molding device, characterized in that: A shearing structure for in-mold cutting of a material head comprising any one of claims 1 to 8.

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