An in-mold injection mold for fabric

Abstract

The present invention relates to an in-mold cutting injection mold for fabrics, which comprises an upper mold body and a lower mold body. The upper mold body includes a fixed template, and the lower mold body includes a movable template. A plurality of first pressing blocks are arranged on the fixed template, and the plurality of first pressing blocks are connected to each other to form a first pressing part. A plurality of second pressing blocks are arranged on the movable template, and the plurality of second pressing blocks are connected to each other to form a second pressing part. A cutting block protrudes from each of the plurality of second pressing blocks, and the plurality of cutting blocks are connected to each other to form a cutting part. A plurality of insertion rods are arranged on the fixed template, and a plurality of slots matching with the insertion rods are arranged on the movable template. The second pressing part is located between the plurality of slots. In the process of mold clamping of the present invention, the fabric can be automatically cut and fixed, so that the fabric can well cover the molded product.

Description

Technical Field

[0001] The present invention relates to the field of molds, and particularly to an in-mold cutting injection mold for fabrics. Background Art

[0002] When injecting plastic for automotive interior parts, the wrapped fabric is directly placed on the mold. Then, when the mold is closed for injection molding, the fabric will directly wrap around the molded product, eliminating the need for later manual wrapping.

[0003] However, there will be excess fabric after the fabric wraps around the product. This excess fabric needs to be cut after the product is injection molded. Therefore, an additional fabric cutting process is required during the production of wrapped automotive interior parts, which prolongs the total production time.

[0004] To improve the production efficiency of wrapped automotive interior parts, it is necessary to complete the fabric cutting work during the injection molding production of the product to reduce the production process of the product. Summary of the Invention

[0005] The present application provides an in-mold cutting injection mold for fabrics, which can automatically cut the fabric and fix the fabric during the mold closing process, enabling the fabric to well wrap the molded product.

[0006] The in-mold cutting injection mold for fabrics provided by the present application adopts the following technical solutions:

[0007] An in-mold cutting injection mold for fabrics includes an upper mold body and a lower mold body. The upper mold body includes a fixed template, and the lower mold body includes a movable template. A plurality of first pressing blocks are provided on the fixed template, and the plurality of first pressing blocks are connected to each other to form a first pressing portion. A plurality of second pressing blocks are provided on the movable template, and the plurality of second pressing blocks are connected to each other to form a second pressing portion. Cutting blocks are provided on the plurality of second pressing blocks, and the plurality of cutting blocks are connected to each other to form a cutting portion. A plurality of insertion rods are provided on the fixed template, and a plurality of slots cooperating with the insertion rods are provided on the movable template. The second pressing portion is located between the plurality of slots.

[0008] By adopting the above technical solutions, before the product is injection molded, the fabric is hung on the plurality of insertion rods, and the plurality of insertion rods pierce the fabric to complete the preliminary fixation of the fabric. Then, the injection molding machine is used to control the mold to close. During the movement of the lower mold body towards the upper mold body, the second pressing portion will move towards the first pressing portion and push the fabric towards the fixed template. Finally, the second pressing portion will press the fabric against the first pressing portion. When the fabric is pressed by the second pressing portion onto the first pressing portion, the cutting portion will cut the fabric to complete the fabric cutting operation. The wrapping fabric will not move randomly under the pressing and limiting of the first pressing portion and the second pressing portion, so that the fabric is not easily deformed or wrinkled during the injection of hot melt plastic. In this way, the fabric can well wrap the injection molded product.

[0009] Preferably, a plurality of sliding grooves are formed in the fixed template, and sliding seats are slidably connected in the plurality of sliding grooves along a direction perpendicular to the mold opening direction of the mold. The fixed template is further provided with a plurality of groups of first driving parts for controlling the sliding of the sliding seats, and the plurality of inserting rods are respectively arranged on the plurality of sliding seats.

[0010] By adopting the above technical solution, the transverse stretching properties of different fabrics are different. Therefore, before product production, the position of the inserting rod needs to be changed so that when the fabric is hung on the inserting rod, it can be effectively stretched transversely, so that the fabric is not prone to wrinkles during mold clamping, and the wrapping effect of the fabric on the injection molded part is ensured. When the position of the inserting rod needs to be adjusted, the position of the inserting rod can be changed by controlling the sliding of the sliding seat through the first driving part.

[0011] Preferably, the first driving part includes a first threaded hole formed in the inner wall of the sliding groove and a first screw rod matched with the first threaded hole. One end of the first screw rod extends into the sliding groove and is rotatably connected to the sliding seat, and the other end of the first screw rod extends out of the fixed template.

[0012] By adopting the above technical solution, rotating the first screw rod can drive the sliding seat to slide, thereby controlling the position of the sliding seat in the sliding groove.

[0013] Preferably, a second threaded hole is formed in the sliding seat, the inserting rod passes through the second threaded hole, and a first anti-loosening nut is threadedly connected in the second threaded hole. The first anti-loosening nut is sleeved outside the inserting rod; an installation block is slidably connected in the inserting slot, and the moving template is provided with a plurality of groups of second driving parts for controlling the sliding of the installation block; a third threaded hole is formed in the installation block, and a second anti-loosening nut is threadedly connected in the third threaded hole. When the mold is clamped, the first anti-loosening nut extends into the third threaded hole, the second anti-loosening nut presses the fabric against the first anti-loosening nut, and the inserting rod passes through the third threaded hole and extends into the inserting slot.

[0014] By adopting the above technical solution, during the process of the lower die body moving towards the upper die body, the first anti-loosening nut will push the fabric into the third threaded hole, so that the fabric fits on the core surface of the moving template, and then the lower die body and the upper die body will be clamped. Therefore, setting the first anti-loosening nut can make the fabric better fit the core of the moving template and thus better fit the injection molded product. The longitudinal stretching ratios of different fabrics are different. Therefore, when changing the fabric wrapping the product, the positions of the first anti-loosening nut and the second anti-loosening nut need to be adjusted according to the longitudinal stretching ratio of the fabric, so as to change the height difference between the side of the first anti-loosening nut away from the fixed template and the fixed template, so that the first anti-loosening nut can effectively press the fabric against the moving template before the mold is clamped, so that the fabric fits the core surface of the moving template and the fabric is not prone to wrinkles.

[0015] Preferably, a guide groove is provided on the insertion rod, a slider is slidably connected in the guide groove, a push block is provided on the slider, and the push block is sleeved on the insertion rod. When the slider moves to the position farthest from the sliding seat, the push block extends out of the insertion rod away from one end of the sliding seat; the second anti-loosening nut is magnetic, and the push block is a metal block that can be adsorbed by the second anti-loosening nut. When the mold is closed, the second anti-loosening nut presses the push block against the first anti-loosening nut.

[0016] By adopting the above technical solution, when the mold is closed, multiple push blocks will press the fabric against the moving template, so that the fabric fits the core of the moving template. After the mold is closed, the second anti-loosening nut and the push block will clamp the cut waste fabric. After the product injection molding is completed, the mold will be opened. When the mold is opened, the second anti-loosening nut will follow the lower mold body away from the fixed template. When the second anti-loosening nut moves away from the fixed template, it will absorb the push block and move with the push block, so that the push block pushes the cut waste fabric out of the fixed template and the insertion rod. When the push block pushes the waste fabric out of the insertion rod and the push block moves to the extreme position, it will no longer move, and the second anti-loosening nut will continue to follow the moving template to move away from the push block. Once the second anti-loosening nut moves to separate from the push block, the clamping of the waste fabric by the second anti-loosening nut and the push block will be cancelled, and the cut waste fabric will automatically fall down under the action of gravity, without the need to manually pick up the waste hanging on the pin.

[0017] Preferably, the guide groove is spiral-shaped, and the push block rotates relative to the insertion rod when it moves close to the movable template. When the push block rotates, it pulls the waste fabric to deform the waste fabric.

[0018] By adopting the above technical solution, the push block will rotate when the push block follows the movement of the second anti-loosening nut. When the push block rotates, it will pull the waste fabric to make the waste fabric rotate and deform, thereby releasing the adhesion between the waste fabric and the movable template and between the waste fabric and the second nut, so that the waste fabric can fall smoothly and automatically after the second nut and the push block cancel the clamping of the waste fabric.

[0019] Preferably, a spring is provided on one end of the guide groove away from the sliding seat, and when the slider moves away from the sliding seat, the spring is squeezed and compressed, and when the slider moves to contact the spring, the plug rod is extended from the end away from the sliding seat.

[0020] By adopting the above technical solution, when the push block is attracted by the second anti-loosening nut and moves away from the sliding seat, the slider will move to contact with the spring and squeeze the spring so that the spring is compressed. When the second anti-loosening nut moves away from the push block and the magnetic attraction force of the second anti-loosening nut on the push block is less than the rebound force of the spring, the spring will rebound and drive the slider and the push block to move back to the original position. When the push block moves back to the original position, it will rotate to release the adhesion with the waste fabric so that the waste fabric can fall smoothly.

[0021] Preferably, the second driving part includes a fourth threaded hole formed in the side wall of the slot, and a second screw rod threadedly connected in the fourth threaded hole. One end of the second screw rod extends out of the moving template, and the other end of the second screw rod is rotatably connected to the mounting block, and the mounting block is a stainless steel metal block.

[0022] By adopting the above technical solution, rotating the second screw rod can adjust the position of the mounting block in the slot, so that the third threaded hole can be aligned with the plug rod. The mounting block made of metal block does not have magnetism, so the second locknut can be easily screwed when adjusting the position of the second locknut.

[0023] The technical effects of the present invention are mainly reflected in the following aspects:

[0024] 1. During the mold closing process of the present invention, the fabric can be automatically cut and fixed, so that the fabric can well cover the molded product;

[0025] 2. When the mold is opened in the present invention, the adhesion between the waste fabric and the moving template is released by the rotation of the push block, so that the waste fabric can be smoothly demolded;

[0026] 3. In the present invention, the adhesion between the push block and the waste fabric is cancelled by the reverse rotation of the push block, so that the waste fabric can be smoothly demolded. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the mold.

[0028] Figure 2 It is a schematic structural diagram of the upper die body and two pressing blocks II.

[0029] Figure 3 It is a schematic structural diagram of the lower die body.

[0030] Figure 4 It is Figure 1 The sectional view of the mold along the A-A line in

[0031] Figure 5 It is a schematic structural diagram of the pressing block II.

[0032] Figure 6 It is Figure 5 The partial enlarged view at B in

[0033] Figure 7 It is Figure 4 The partial enlarged view at C in

[0034] Figure 8 It is a schematic structural diagram of components such as the plug rod and the sliding seat.

[0035] Figure 9 It is Figure 8 The schematic structural diagram of the push block after partial section in

[0036] Figure 10 yes Figure 9 A schematic diagram of the structure of each component from another angle.

[0037] : 1. upper mold body; 11. fixed mold plate; 12. pressure block 1; 13. pressing part 1; 14. insertion rod; 15. slide groove; 2. lower mold body; 21. movable mold plate; 22. pressure block 2; 23. pressing part 2; 24. cutting block; 25. cutting part; 26. slot; 3. sliding seat; 4. first driving part; 41. first threaded hole; 42. first screw; 51. second threaded hole; 52. first anti-loosening nut; 53. mounting block; 54. third threaded hole; 55. second anti-loosening nut; 61. guide groove; 62. slider; 63. push block; 64. spring; 7. second driving part; 71. fourth threaded hole; 72. second screw. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings to make the technical solution of the present application easier to understand and grasp.

[0039] Reference Figure 1 A fabric in-mold cutting injection mold of this embodiment includes an upper mold body 1 and a lower mold body 2. The upper mold body 1 includes a fixed mold plate 11, a hot runner plate and an upper fixed plate, and the lower mold body 2 includes a movable mold plate 21, two mold feet and a lower fixed plate.

[0040] Reference Figures 1 - 6 The fixed die plate 11 is provided with a plurality of pressing blocks 12, which are connected to each other to form a pressing portion 13. The movable die plate 21 is provided with a plurality of pressing blocks 22, which are connected to each other to form a pressing portion 23. The plurality of pressing blocks 22 are integrally formed with cutting blocks 24, which are connected to each other to form a cutting portion 25.

[0041] Reference Figure 1 , Figure 4 and Figure 7 The fixed plate 11 is provided with a plurality of slide grooves 15, in which the slide seats 3 are slidably connected along the mold opening direction perpendicular to the mold, and the fixed plate 11 is also provided with a plurality of first driving parts 4 for controlling the sliding of the slide seats 3. The first driving part 4 includes a first threaded hole 41 provided on the inner wall of the slide groove 15, and a first screw 42 matched with the first threaded hole 41, one end of the first screw 42 extends into the slide groove 15 and is rotatably connected to the slide seat 3, and the other end of the first screw 42 extends out of the fixed plate 11.

[0042] Reference Figure 1 , Figure 4 and Figures 7 - 10, a second threaded hole 51 is formed in the sliding seat 3, and a plug rod 14 is fixed on the sliding seat 3. The plug rod 14 passes through the second threaded hole 51 and extends out of the sliding seat 3. A first anti-loosening nut 52 is threadedly connected in the second threaded hole 51, and the first anti-loosening nut 52 is sleeved outside the plug rod 14. Two spiral guiding grooves 61 are formed in the plug rod 14, and the two guiding grooves 61 are symmetrically arranged on the plug rod 14.

[0043] Refer to Figure 9 and Figure 10 , sliding blocks 62 are slidably connected in both of the two guiding grooves 61. The sliding blocks 62 are columnar, which is beneficial to reducing the frictional force during sliding. A pushing block 63 is further sleeved outside the plug rod 14, and both of the two sliding blocks 62 are fixedly connected to the pushing block 63. During the process that the pushing block 63 moves close to the moving template 21, the pushing block 63 will rotate relative to the plug rod 14 under the action of the sliding blocks 62 and the guiding grooves 61.

[0044] Refer to Figure 9 and Figure 10 , springs 64 are fixed at one ends of the two guiding grooves 61 far from the sliding seat 3. When the sliding blocks 62 move away from the sliding seat 3, the springs 64 will be compressed by extrusion and the springs 64 will be stressed. When the sliding blocks 62 move to contact with the springs 64, one end of the pushing block 63 far from the sliding seat 3 is located on the side of the plug rod 14 far from the sliding seat 3.

[0045] Refer to Figure 1 , Figure 3 , Figure 4 and Figure 7 , a plurality of slots 26 matched with the plug rod 14 are arranged on the moving template 21. An installation block 53 is slidably connected in the slot 26 along a direction perpendicular to the mold opening direction of the mold. The installation block 53 is a stainless steel metal block. A third threaded hole 54 is formed in the installation block 53, and a second anti-loosening nut 55 is threadedly connected in the third threaded hole 54. The second anti-loosening nut 55 has magnetism and is made of a magnet. The pushing block 63 is a metal block and can be adsorbed by the second anti-loosening nut 55. When the mold is closed, the pushing block 63 extends into the third threaded hole 54, and the second anti-loosening nut 55 presses the fabric against the pushing block 63. The plug rod 14 passes through the third threaded hole 54, the second anti-loosening nut 55 and extends into the slot 26.

[0046] Refer to Figure 1 , Figure 3 , Figure 4 and Figure 7 , a plurality of second driving parts 7 for controlling the sliding of the installation block 53 are arranged on the moving template 21. The second driving part 7 includes a fourth threaded hole 71 formed on the side wall of the slot 26 and a second screw rod 72 threadedly connected in the fourth threaded hole 71. One end of the second screw rod 72 extends out of the moving template 21, and the other end of the second screw rod 72 is rotatably connected to the installation block 53.

[0047] Refer to Figures 1 - 10The complete injection molding and cutting steps of the mold of this application are as follows:

[0048] First, the positions of the multiple insertion rods 14 are adjusted according to the transverse tensile performance of the covering fabric. When adjusting the positions of the insertion rods 14, the multiple first screws 42 are screwed to drive the multiple sliding seats 3 to slide, thereby changing the positions of the multiple sliding seats 3 in the slide grooves 15. When the positions of the multiple sliding seats 3 are changed, the positions of the multiple insertion rods 14 will also change. After the positions of the multiple insertion rods 14 are adjusted, the multiple second screws 72 are screwed to adjust the positions of the multiple mounting blocks 53 in the multiple slots 26 so that the inner holes of the multiple third threaded holes 54 and the multiple second anti-loosening nuts 55 can be aligned with the multiple insertion rods 14.

[0049] Then, according to the longitudinal tensile performance of the covering fabric, the first locking nuts 52 and the second locking nuts 55 are screwed to adjust the positions of the first locking nuts 52 and the second locking nuts 55. Thus, the height difference between the first locking nuts 52 away from the fixed template 11 and the fixed template 11 is changed, so that before the mold is closed, the push blocks 63 can effectively push the fabric into the third threaded hole 54 to generate a pressing force on the fabric, thereby pressing the fabric against the movable template 21 so that the fabric fits the core surface of the movable template 21, further preventing wrinkles.

[0050] After completing the above steps, the injection molding production of interior decoration parts can begin. When the interior decoration parts are injection molded, the fabric is first hung on multiple insertion rods 14 so that the multiple insertion rods 14 pierce the fabric to complete the initial fixation of the fabric. Then the injection molding machine is used to control the lower mold body 2 to move toward the upper mold body 1 so that the mold is closed. When the mold is closed, the pressing part 23 will move toward the pressing part 1 13 and push the fabric toward the fixed mold plate 11. When the fabric moves toward the fixed mold plate 11, it will push the multiple push blocks 63 to move toward the fixed mold plate 11 together.

[0051] When the multiple push blocks 63 move to the point where they come into conflict with the multiple first locking nuts 52, they stop moving. As the lower mold body 2 continues to move, the multiple push blocks 63 move into the third threaded hole 54 and push a portion of the fabric into the third threaded hole 54, and the multiple insertion rods 14 extend into the multiple third threaded holes 54 and pass through the multiple second locking nuts 55. In the process of the multiple push blocks 63 pushing a portion of the fabric into the third threaded hole 54, the multiple push blocks 63 generate a resisting force on the fabric, so that the fabric will effectively fit the core of the moving mold plate 21 and the fabric can be effectively stretched, so that the fabric is not easy to wrinkle when the mold is closed, ensuring the covering effect of the fabric on the injection molded product.

[0052] Subsequently, as the lower die body 2 continues to move, finally, the moving template 21 will abut against the fixed template 11. Once the moving template 21 abuts against the fixed template 11, the pressing part two 23 will press the fabric against the pressing part one 13, and at the same time, the cutting part 25 will cut the fabric to complete the cutting operation of the fabric. At the same time, all the second anti-loosening nuts 55 and the pushing blocks 63 will clamp the cut waste fabric.

[0053] Then, the injection molding machine injects hot-melt plastic into the mold. The hot-melt plastic will flow into the molding cavity between the fixed template 11 and the moving template 21 and fit with the fabric for covering, completing the covering operation of the fabric on the interior trim part.

[0054] After the injection molding of the interior trim part is completed, the injection molding machine controls the mold to open, causing the moving template 21 to move away from the fixed template 11. During the process of the moving template 21 moving away from the fixed template 11, the second anti-loosening nut 55 will move away from the fixed template 11. When the second anti-loosening nut 55 moves away from the fixed template 11, it will adsorb the pushing block 63 and drive the pushing block 63 to move together, so that the pushing block 63 will push the cut waste fabric out of the fixed template 11 and the insertion rod 14.

[0055] Under the action of the guiding groove 61 and the sliding block 62, the pushing block 63 will rotate during the process of following the second anti-loosening nut 55. When the pushing block 63 rotates, it will pull the waste fabric, causing the waste fabric to rotate and deform, thereby releasing the adhesion between the waste fabric and the moving template 21 and between the waste fabric and the second nut.

[0056] Subsequently, the sliding block 62 will move to abut against the spring 64 and compress the spring 64, causing the spring 64 to be stressed and compressed. When the pushing block 63 pushes the waste fabric out of the insertion rod 14 and the sliding block 62 moves to the end point, the pushing block 63 will stop moving, while the second anti-loosening nut 55 will continue to move away from the pushing block 63 following the moving template 21. When the second anti-loosening nut 55 moves away from the pushing block 63, the clamping of the waste fabric by the second anti-loosening nut 55 and the pushing block 63 will be cancelled. After the second anti-loosening nut 55 and the pushing block 63 clamp the waste fabric, the waste fabric may directly fall off multiple pushing blocks 63 due to gravity and automatically drop, or it is also possible that the waste fabric adheres to the pushing block 63 and cannot automatically drop.

[0057] If the waste fabric adheres to the pushing block 63 and cannot automatically drop, when the magnetic suction force of the second anti-loosening nut 55 on the pushing block 63 is less than the resilience of the spring 64, the spring 64 will rebound and drive the sliding block 62 and the pushing block 63 to move back to their original positions. When the pushing block 63 moves back to its original position, it will rotate back to release the adhesion with the waste fabric, enabling the waste fabric to fall smoothly. In this way, the automatic discharging of the waste fabric is completed, and there is no need to manually remove the waste fabric from multiple insertion rods 14 after each mold opening.

[0058] Of course, the above are only typical examples of this application. In addition, this application can also have many other specific implementation manners. Any technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection required by this application.

Claims

1. A fabric in-mold injection mold, comprising an upper mold body and a lower mold body, wherein the upper mold body comprises a fixed mold plate and the lower mold body comprises a movable mold plate, characterized in that: The fixed template is provided with a plurality of pressing blocks 1, which are interconnected to form a pressing part 1; the movable template is provided with a plurality of pressing blocks 2, which are interconnected to form a pressing part 2, and cutting blocks are provided on the plurality of pressing blocks 2, which are interconnected to form a cutting part; the fixed template is provided with a plurality of insertion rods, the movable template is provided with a plurality of slots matching the insertion rods, and the pressing part 2 is located between the plurality of slots; the fixed template is provided with a plurality of sliding grooves, and the plurality of sliding grooves are all connected with sliding seats in a sliding manner perpendicular to the mold opening direction of the mold, and the fixed template is also provided with a plurality of first driving parts for controlling the sliding of the sliding seats, and the plurality of The insertion rods are respectively arranged on multiple sliding seats; the sliding seat is provided with a second threaded hole, the insertion rod passes through the second threaded hole, the second threaded hole is threadedly connected with a first anti-loosening nut, and the first anti-loosening nut is sleeved on the outside of the insertion rod; a mounting block is slidingly connected in the slot, and the movable template is provided with multiple groups of second driving parts for controlling the sliding of the mounting block; the mounting block is provided with a third threaded hole, the third threaded hole is threadedly connected with a second anti-loosening nut, when the mold is closed, the first anti-loosening nut extends into the third threaded hole, the second anti-loosening nut presses the fabric against the first anti-loosening nut, and the insertion rod passes through the third threaded hole and extends into the slot.

2. A fabric in-mold cutting injection mold according to claim 1, characterized in that: The first driving part includes a first threaded hole formed on the inner wall of the slide slot and a first screw matched with the first threaded hole. One end of the first screw extends into the slide slot and is rotatably connected to the sliding seat, and the other end of the first screw extends out of the fixed template.

3. A fabric in-mold cutting injection mold according to claim 1, characterized in that: A guide groove is provided on the insertion rod, a slider is slidably connected in the guide groove, a push block is provided on the slider, and the push block is sleeved on the insertion rod. When the slider moves to the position farthest from the sliding seat, the push block extends out of the insertion rod away from one end of the sliding seat; the second anti-loosening nut is magnetic, and the push block is a metal block that can be adsorbed by the second anti-loosening nut. When the mold is closed, the second anti-loosening nut presses the push block against the first anti-loosening nut.

4. A fabric in-mold cutting injection mold according to claim 3, characterized in that: The guide groove is spiral-shaped, and the push block rotates relative to the insertion rod when it moves close to the movable template. When the push block rotates, it pulls the waste fabric to deform the waste fabric.

5. A fabric in-mold cutting injection mold according to claim 4, characterized in that: A spring is arranged on one end of the guide groove away from the sliding seat. When the slider moves away from the sliding seat, the spring is squeezed and compressed. When the slider moves to contact the spring, the plug rod is extended from the end away from the sliding seat.

6. A fabric in-mold cutting injection mold according to claim 3, characterized in that: The second driving part includes a fourth threaded hole opened on the side wall of the slot, a second screw threadedly connected in the fourth threaded hole, one end of the second screw extending out of the movable template, and the other end of the second screw rotatably connected to the mounting block, which is a stainless steel metal block.

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