In-mold automatic gate cutting structure

Abstract

The present invention discloses an in-mold automatic gate cutting structure, comprising a slider seat that can slide on an upper template, an inclined hole is provided at one end of the slider seat, an inclined rod at the top of a pull block is inserted into the inclined hole, the pull block includes an inclined rod at the top and a straight rod at the bottom, and the moving direction of the pull block is perpendicular to the moving direction of the slider seat; a movable insert that penetrates the upper template and can slide up and down in the upper template is provided in the upper template, the bottom end of the movable insert is directly opposite to one end of a cutter, the other end of the cutter is fixedly connected to one end of a delay ejector, and a fixed block is slidably sleeved on the other end of the delay ejector; each movable insert and its corresponding cutter are respectively located at the upper and lower sides of the gate between the mold cavity of the injection product and a glue feeding channel, and the top of the cutter is a blade. When the present invention is in a mold closing state, the cutter ejects to cut off the gate, and the gap generated by the bottom surface of the slider seat and the top of the movable insert is greater than the thickness of the gate, thereby generating a misaligned cut to avoid residual gates on the product.

Description

Technical Field

[0001] The invention relates to an automatic gate cutting structure in a mold, belonging to the technical field of molds. Background Art

[0002] The rapid development of science and technology has led to a rapid reduction in product replacement cycles, shortened delivery times, and rapid response to market demand, which has become the first factor for injection mold companies to participate in market competition. Therefore, in order to meet the improvement of quality of life, in the development of some more humanized products, plastic products have a more cutting-edge appearance, visual perception, and application properties, and the mold structure is becoming more and more complex. Compared with traditional mold design, modern mold design has undergone earth-shaking changes, especially in the design of mold structure, and some product functional requirements, and typical cases of special structures have also been born.

[0003] Plastic products are expanding and being used more and more widely in all walks of life, and the structure of products is becoming more and more complex. There are higher standards for the precision fit of molds and the stability of dimensions. Here, it is more necessary to consider the rationality and stability of the structure, the simplicity of processing and the convenience of production. The complexity of the product directly places higher requirements on the stability of the mold structure. How to optimize and connect the existing structure to obtain a simple, cost-controlled, more reasonable and effective mold structure, that is, to simplify the structure while ensuring the simplicity of processing, the convenience of maintenance, and the rationality of the structure, has become a series of research courses.

[0004] For some shell parts, only edge gluing is suitable, because the edge gluing molding process window is relatively large, the product appearance can be greatly improved, and it is suitable for transparent, high-gloss, and relatively thin plastic products with high appearance requirements. However, its disadvantage is that the sprue needs to be trimmed manually, and there will be large cutting marks on the appearance, and it will take up a lot of labor costs, which is not cost-effective.

[0005] The current mold structure is as follows Fig.17 As shown, the bottom of the upper code template 10 is fixedly connected to the top of the flow channel plate 11, the bottom of the flow channel plate 11 is fixedly connected to the top of the A plate 12, the A plate 12 is arranged directly above the B plate 13, and the B plate 13 is fixedly connected to the outer side of the lower fixed plate 15 through the square iron 14.

[0006] like Figure 1 As shown, due to the thinness of the product and the high appearance requirements, it is only suitable to glue from the edge of the product. Figure 1 It can be seen that there are 4 gates on a product, which is a relatively large number. Manually removing the gates affects the appearance and is costly. Figure 2 As shown, it can be seen that the gate is difficult to cut off at the product.

[0007] Therefore, it is necessary to study a structural solution that can automatically remove the water outlet, save labor and obtain a beautiful appearance. Summary of the invention

[0008] The technical problem to be solved by the present invention is: for plastic products that are only suitable for edge gluing, how to automatically remove the nozzle to avoid the shearing marks caused by manual trimming of the nozzle and the problem of occupying a large amount of labor costs.

[0009] In order to solve the above technical problems, the technical solution of the present invention is to provide an in-mold automatic gate cutting structure, which is characterized in that it includes a slider seat that can slide on the upper template, one end of the slider seat is provided with an inclined hole, and an inclined rod at the top of a pull block matching it is inserted into the inclined hole, the pull block includes an inclined rod at the top and a straight rod at the bottom, and the moving direction of the pull block is perpendicular to the moving direction of the slider seat; a movable insert that penetrates the upper template and can slide up and down in the upper template is provided in the upper template, the bottom end of the movable insert is directly opposite to one end of the cutter, the other end of the cutter is fixedly connected to one end of a delayed ejector pin, and the other end of the delayed ejector pin slides up The movable sleeve has a fixed block; the size of the connection between the cutter and the delayed ejector pin is larger than the size of the through hole on the fixed block that passes through the other end of the delayed ejector pin; each movable insert and its corresponding cutter are respectively located on the upper and lower sides of the gate between the mold cavity of the injection product and a glue feeding channel, and the top of the cutter is the blade; when the mold is closed, the top of the blade on the cutter is close to the bottom surface of the gate; when the cutter is in the ejection state or the mold opening state, the cutter moves upward so that the blade passes through the gate between the mold cavity of the injection product and the glue feeding channel, and pushes its corresponding movable insert upward until the top of the movable insert presses against the bottom surface of the slider seat.

[0010] Preferably, a plurality of protrusions are provided at the bottom of the slider seat; when the mold is closed, the top of each movable insert is pressed against the bottom of a corresponding protrusion; when the cutter is ejected or the cutter is opened, the slider seat moves horizontally so that the top of the movable insert is offset from the bottom of the protrusion, and there is a gap between the top of the movable insert and the bottom surface of the slider seat directly above it.

[0011] Preferably, the number of the protrusions and the number of the movable inserts are the same as the number of the gates.

[0012] Preferably, a groove is provided on the top of the slider seat, a limit block for limiting the sliding distance of the slider seat is provided in the groove, and the limit block is fixed on the bottom of the flow channel plate.

[0013] Preferably, the moving distance of the cutter is greater than the thickness of the mold cavity of the injection molded product.

[0014] Preferably, the pulling block and the fixing block are both fixed on the cutting plate, and the cutting plate is arranged between the lower ejector plate and the lower fixing plate.

[0015] Preferably, in the mold closing state, the top end of the pull block passes through the lower ejector plate, the upper ejector plate, the lower mold plate, the upper mold plate in sequence, and is arranged in the runner plate.

[0016] Preferably, the longitudinal cross-section of the slider seat is an inverted convex structure, and the upper template is provided with a concave sliding groove matching the slider seat.

[0017] Preferably, a second guide rod is provided in the concave shaped slide groove, one end of the second guide rod is fixed on the upper template, and the other end of the second guide rod passes through the interior of the slider seat and is parallel to the moving direction of the slider seat.

[0018] Preferably, the pull block is provided with wear-resistant blocks on the upper and lower sides of the inclined rod, respectively, and the inclined hole is provided between the two wear-resistant blocks.

[0019] According to the existing problems of the prior art, a mechanism is needed to remove the gate when the mold is not opened. The difficulty involved is: how to make a mechanism move in the mold closing state to remove the gate. Another difficulty in removing the gate is that it needs to be cut in an offset manner so that there will be no residue on the product, and it can be truly removed.

[0020] When the mold is closed, the cutter ejects to cut off the gate, and the gap between the bottom surface of the slider seat and the top of the movable insert is larger than the thickness of the gate, thereby generating offset cutting to avoid residual gate on the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a certain thin-walled product;

[0022] Figure 2 for Figure 1 A partial enlarged schematic diagram of the middle A position (gate);

[0023] Figure 3 A schematic diagram of an in-mold automatic gate cutting structure;

[0024] Figure 4 It is a side view of the mold in the closed state (the left half of the structure);

[0025] Figure 5 It is a side view of the ejection state of the cutter in the mold (the right half of the structure);

[0026] Figure 6 for Figure 5 The enlarged schematic diagram at position E in the middle;

[0027] Figure 7 for Figure 4 The enlarged schematic diagram at the F position in the middle;

[0028] Figure 8 It is a schematic diagram of the overlapped mold closing state and ejection state;

[0029] Fig. 9 It is a schematic diagram of the front structure of the automatic gate cutting structure of the present invention in the mold;

[0030] Fig.10 It is a schematic diagram of the action of the slider seat, the puller block and the movable insert when the cutter is in the mold closing state;

[0031] Fig.11 It is a schematic diagram of the action of the slider seat, the puller block and the movable insert when the cutter is ejected;

[0032] Fig.12 This is a schematic diagram of the actions of the slider seat, puller block, and movable insert when the cutter is in the mold opening state;

[0033] Fig.13 for Fig.10 An enlarged schematic diagram of position B in the middle;

[0034] Fig.14 for Fig.11 An enlarged schematic diagram of the C position in the middle;

[0035] Fig.15 for Fig.12 A magnified schematic diagram of the position D in the middle;

[0036] Fig.16 is a schematic diagram of a cutter;

[0037] Fig.17 This is a schematic diagram of the current mold structure. DETAILED DESCRIPTION

[0038] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0039] The present invention provides an in-mold automatic gate cutting structure, such as Figure 3 , Fig. 9 As shown, it includes a limit block 8, a slider seat 1, a pull block 2, a cutter 4 (such as Fig.16As shown), the delay ejector 5, the fixed block 6, the movable insert 7, the limit block 8 is fixed at the bottom of the flow channel plate 11, and a sliding slider seat 1 is provided below the limit block 8. A groove is provided on the top of the slider seat 1, and the limit block 8 is provided in the groove. The groove is used to limit the sliding distance of the slider seat 1 relative to the limit block 8. The slider seat 1 is slidably provided on the A plate (i.e., the upper template) 12. The longitudinal section of the slider seat 1 is an inverted convex structure. The A plate 12 is provided with a concave groove matching the slider seat 1, which is convenient for the sliding of the slider seat 1 and plays a guiding role. A second guide rod 25 is provided in the concave groove. One end of the second guide rod 25 is fixed on the A plate 12, and the other end of the second guide rod 25 passes through the inside of the slider seat 1 and is parallel to the moving direction of the slider seat 1. The second guide rod 25 plays a guiding role in the movement of the slider seat 1. An inclined hole is provided at one end of the slider seat 1, and an inclined rod matching it is inserted into the inclined hole. The inclined rod is located at the top of the pull block 2. Wear-resistant blocks 3 are respectively provided on the upper and lower sides of the inclined rod on the pull block 2. The inclined hole is provided between the two wear-resistant blocks 3. The pull block 2 includes an inclined rod at the top and a straight rod at the bottom. The inclined rods are connected to the straight rods and form an inclination angle greater than 90 degrees with each other. The left and right horizontal movement of the slider seat 1 is realized by the vertical movement of the pull block 2, that is, the movement direction of the pull block 2 is perpendicular to the movement direction of the slider seat 1. A protrusion 24 is provided at the bottom of the slider seat 1, and a long hole is opened at the bottom of the concave-shaped slide groove for the movable insert 7 to pass through. In the mold closing state, the top of each movable insert 7 is pressed against the bottom of a corresponding protrusion 24. When the cutter is ejected and the cutter is molded, the slider seat 1 moves horizontally, so that the top of the movable insert 7 is staggered with the bottom of the protrusion 24, and there is a gap between the top of the movable insert 7 and the bottom of the slider seat 1 directly above it, providing a moving distance for the cutter 4 to move upward. A through hole is provided in the A plate 12 so that each movable insert 7 can only move up and down, and each movable insert 7 is correspondingly arranged in one through hole.

[0040] The bottom end of the movable insert 7 passes through the long hole and faces one end (upper end) of the cutter 4, and the other end (lower end) of the cutter 4 is fixedly connected to one end of the delay ejector 5, and a fixed block 6 is slidably sleeved on the other end of the delay ejector 5. The connection position between the cutter 4 and the delay ejector 5 is larger than the through hole on the fixed block 6 that passes through the other end of the delay ejector 5, so that the fixed block 6 can only move under the delay ejector 5 and cannot slide onto the cutter 4. When the fixed block 6 pushes upward, that is, the fixed block 6 slides along the lower part of the delay ejector 5, the fixed block 6 moves upward for a distance and then presses against the connection position between the delay ejector 5 and the cutter 4, driving the cutter 4 and the movable insert 7 to move upward together.

[0041] Each movable insert 7 and its corresponding cutter 4 are respectively located at the upper and lower sides of the gate between the mold cavity 91 of the injection molded product and a glue inlet channel 92. The top of the cutter 4 is the blade, and the blade of the cutter 4 is directly below the gate. In the mold closing state, the top of the blade on the cutter 4 is close to the bottom surface of the gate; when the cutter is in the ejection state and the mold opening state, the cutter 4 moves upward so that the blade passes through the gate between the mold cavity 91 of the injection molded product and the glue inlet channel 92, separating the mold cavity 91 of the injection molded product and the glue inlet channel 92 to avoid the problem of the gate on the product. And push the corresponding movable insert 7 upward until the top of the movable insert 7 is against the bottom surface of the slider seat 1.

[0042] The two sides of the cutter 4 are matched with the injection product cavity 91 and the glue inlet channel 92 respectively, and there is no risk of glue leakage.

[0043] like Fig. 9 As shown, the bottom of the upper code template 10 is fixedly connected to the top of the flow channel plate 11, the bottom of the flow channel plate 11 is fixedly connected to the top of the A plate 12, a lower ejector plate 17 is arranged above the lower fixed plate 15, an upper ejector plate 16 is arranged above the lower ejector plate 17, a B plate (lower template) 13 is arranged above the upper ejector plate 16, the A plate 12 is arranged directly above the B plate 13, the lower ejector plate 17, the upper ejector plate 16, and the B plate 13 are connected by a return pin 19, one end of the return pin 19 is fixed on the lower ejector plate 17, and the other end passes through the B plate 13 and presses against the bottom of the A plate 12, and a return pin spring 20 is arranged on the outside of the return pin 19, and the two ends of the return pin spring 20 are respectively pressed between the upper ejector plate 16 and the B plate 13. One end of the return pin spring 20 is arranged in the spring groove of the upper ejector plate 16. The B plate 13 is fixedly connected to the outside of the lower fixed plate 15 by a square iron 14.

[0044] The function of the return pin 19 is to guide the return pin spring 20. In addition, the return pin spring 20 can return the ejector plate (i.e., the upper ejector plate 16 and the lower ejector plate 17). At the same time, when the mold is fully closed, the A plate 12 supports the return pin 19, so that the ejector plate can be returned to its original position more effectively and with certainty.

[0045] The bottom of the pull block 2 is fixed on the cutter plate 18, and the fixed block 6 is fixed on the cutter plate 18. The cutter plate 18 is arranged between the lower ejector plate 17 and the lower fixed plate 15. The cutter plate 18 is pushed upward to simultaneously push the pull block 2 and the fixed block 6. The moving distance of the cutter 4 is greater than the thickness of the mold cavity 91 of the injection molded product.

[0046] In the mold closing state, the top of the pull block 2 can pass through the lower ejector plate 17, the upper ejector plate 16, the B plate 13, and the A plate 12 in sequence, and is arranged in the flow channel plate 11; the wear-resistant block 3 on the upper part of the pull block 2 is arranged in the flow channel plate 11, and the wear-resistant block 3 on the lower part of the pull block 2 is arranged between the B plate 13 and the A plate 12, and is arranged on the upper surface of the B plate 13. The wear-resistant block 3 plays the role of fixing and guiding the pull block 2.

[0047] The bottom of the B plate 13 is fixedly connected to one end of the first guide rod 21, and the other end of the first guide rod 21 passes through the upper ejector plate 16, the lower ejector plate 17, and the cutter plate 18 in sequence. The lower fixed plate 15 is provided with a slide groove 23 for the first guide rod 21 to pass through. The bottom of the B plate 13 and the top of the cutter plate 18 are respectively connected to the two ends of the cutter spring 22, and the cutter spring 22 passes through the upper ejector plate 16 and the lower ejector plate 17.

[0048] The structure of the present invention utilizes the existing function of the injection molding machine to allow the injection molding machine to eject the cutting plate 18 in the mold closing state. Figure 4-Figure 8 As shown, there is a gap of 18mm between the cutting plate 18 and the lower ejector plate 17. This gap is used to allow the cutting plate 18 to move without opening the mold, and at the same time drive the pull block 2 to move, and then drive the slider seat 1 to move, such as Fig. 9 As shown, a protrusion 24 is designed at the bottom of the slider seat 1, and the slider seat 1 can slide left and right. The sliding of the slider seat 1 is controlled by the limit block 8, such as Fig. 9 As shown, the limit block 8 has 8MM of moving space on both sides. Figure 8 As shown in the enlarged view of the "overlapping state", it can be seen that there is a 1MM miscut.

[0049] The working principle of the present invention is as follows:

[0050] The mold closing status is as follows Fig.10 , Fig.13 As shown, at this time, the cutting plate 18 is pushed out 18MM, driving the pull block 2 to move upward, and at the same time driving the slider seat 1 to move 8MM to the right, as shown in FIG. Fig.11 , Fig.14 As shown, there is a gap between the bottom surface of the slider seat 1 and the top of the movable insert 7, and this gap is greater than 1MM. Here, the cutter plate 18 moves 18MM, and at the same time, the cutter 4 only moves 1MM upward. The delay ejector 5 is used here. The delay ejector 5 delays the cutter 4 by 17MM before it moves. The cutter plate 18 moves 18MM, and as a result, the cutter 4 only moves 1MM. The thickness of the gate is only 0.3MM. The cutter 4 moves 1MM, so the cutter 4 produces a miscut of 0.7MM, which can effectively ensure the cutting of the casting.

[0051] After cutting off the gate, the cutting blade 18 returns to its original position. Fig. 9 The cutter spring 22 in the middle is to assist the cutter plate 18 to return to its original position. The next step is to open the mold. Fig.12 , Fig.15 Here, the slider seat 1 will move 8MM to the right. The slider seat 1 moves back and forth in the mold, and then the mold is opened and the product is ejected normally as in the prior art.

[0052] Note: The up, down, left, and right in the above embodiments are all determined according to the corresponding positions in the respective drawings.

Claims

1. An in-mold automatic gate cutting structure, characterized in that: The invention comprises a slider seat (1) which can slide on an upper template (12), one end of the slider seat (1) is provided with an oblique hole, a matching oblique rod at the top of a pull block (2) is inserted into the oblique hole, the pull block (2) comprises an oblique rod at the top and a straight rod at the bottom, the moving direction of the pull block (2) is perpendicular to the moving direction of the slider seat (1); a movable insert (7) is provided in the upper template (12) which penetrates the upper template (12) and can slide up and down in the upper template (12), the bottom end of the movable insert (7) is directly opposite to one end of a cutter (4), the other end of the cutter (4) is fixedly connected to one end of a delay ejector pin (5), the other end of the delay ejector pin (5) is slidably sleeved with a fixed block (6); the cutter (4) and the delay ejector pin (5) are connected to each other. ) is larger than the size of the through hole on the fixed block (6) passing through the other end of the delay ejector pin (5); each movable insert (7) and its corresponding cutter (4) are respectively located on the upper and lower sides of the gate between the mold cavity (91) of the injection molded product and a glue inlet channel (92), and the top of the cutter (4) is a blade; when the mold is closed, the top of the blade on the cutter (4) is in close contact with the bottom surface of the gate; when the cutter is in the ejection state or the mold opening state, the cutter (4) moves upward so that the blade passes through the gate between the mold cavity (91) of the injection molded product and the glue inlet channel (92), and pushes the corresponding movable insert (7) upward until the top of the movable insert (7) presses against the bottom surface of the slider seat (1); The bottom of the slider seat (1) is provided with a plurality of protrusions (24); in the mold closing state, the top of each movable insert (7) is pressed against the bottom of a corresponding protrusion (24); in the cutter ejection state or the cutter mold opening state, the slider seat (1) moves horizontally, so that the top of the movable insert (7) is offset from the bottom of the protrusion (24), and a gap exists between the top of the movable insert (7) and the bottom surface of the slider seat (1) directly above it; The top of the slider seat (1) is provided with a groove, and a limit block (8) for limiting the sliding distance of the slider seat (1) is provided in the groove, and the limit block (8) is fixed to the bottom of the flow channel plate (11); The pulling block (2) and the fixing block (6) are both fixed on a cutting plate (18), and the cutting plate (18) is arranged between the lower ejector plate (17) and the lower fixing plate (15); When the mold is in the closed state, the top end of the pull block (2) passes through the lower ejector plate (17), the upper ejector plate (16), the lower mold plate (13), and the upper mold plate (12) in sequence, and is arranged in the flow channel plate (11).

2. The in-mold automatic gate cutting structure according to claim 1, characterized in that: The number of the protrusions (24) and the number of the movable inserts (7) are the same as the number of the gates.

3. The in-mold automatic gate cutting structure according to claim 1, characterized in that: The moving distance of the cutter (4) is greater than the thickness of the mold cavity (91) of the injection molded product.

4. The in-mold automatic gate cutting structure according to claim 1, characterized in that: The longitudinal cross-section of the slider seat (1) is an inverted convex structure, and the upper template (12) is provided with a concave sliding groove matching the slider seat (1).

5. The in-mold automatic gate cutting structure according to claim 4, characterized in that: A second guide rod (25) is provided in the concave shaped slide groove. One end of the second guide rod (25) is fixed to the upper template (12). The other end of the second guide rod (25) passes through the interior of the slider seat (1) and is parallel to the moving direction of the slider seat (1).

6. The in-mold automatic gate cutting structure according to claim 1, characterized in that: The pull block (2) is provided with wear-resistant blocks (3) on the upper and lower sides of the inclined rod, respectively, and the inclined hole is provided between the two wear-resistant blocks (3).

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