An in-mold material pulling device for thin strip materials

Abstract

The present invention discloses a thin strip in-die pulling device, which mainly comprises a first hook block, a second hook block, a first lifting mechanism, a second lifting mechanism and a pulling mechanism; the first lifting mechanism comprises a first inclined wedge, a driving block and a sliding block, the driving block is fixed in the lower die, two first hook blocks are vertically installed in the driving block, the first inclined wedge is installed in the upper die, and when the first inclined wedge moves downward to pick up the nail, the first hook block rises; the pulling mechanism comprises a second inclined wedge, a pulling block and a roller, the pulling block is slidably connected in the lower template, the second inclined wedge is fixed in the upper die, and two second hook blocks are arranged in the pulling block. This device realizes the pulling action during the opening process of the die, converts the up-and-down movement of the die into the horizontal reciprocating movement of the second hook block. The first hook block remains connected to the strip at all times except temporarily disengaging from the strip during the pulling process. The cooperation of the two hook blocks makes the step-by-step pulling process smoother.

Description

Technical Field

[0001] The present invention belongs to the technical field of die cutting, and relates to an in-die material pulling device for thin strip materials. Background Art

[0002] For thin materials with a thickness of less than 0.1 mm, such as soft aluminum and copper materials, when using a traditional feeder to feed the material in a die cutting stamping die, the phenomena of material belt deformation and die jamming are relatively serious, resulting in frequent misalignment of the material belt during feeding, leading to waste of raw materials and damage to the die.

[0003] A Chinese invention patent with the publication number of CN 111570654 A discloses a in-die pulling and feeding mechanism for strip materials, which includes a driving block, a roller and a material pulling block. When the upper die base moves to the lower limit position, the material pulling block presses against the recessed part. At this time, the protrusion just penetrates into the mating hole of the strip material from below. The strip material is provided with mating holes spaced apart from the protrusions. When the upper die base moves upward, the inclined surface connecting part of the driving block pushes the material pulling block to move horizontally forward. The material pulling block drives the strip material to move forward through the protrusion. When the upper die base moves to the upper limit position, the material pulling block presses against the protruding part, completing a feeding action, and the strip material is conveyed forward by one station.

[0004] Although the above-mentioned material pulling mechanism can complete the step-by-step material pulling of the thin strip instead of the material pulling machine, this material pulling mechanism only has a set of protrusions adapted to the strip material. During the process of opening the die, the driving block resets and the protrusion disengages from the strip material. At this time, the strip material is not restricted. Once the strip material has a problem of moving backward, it will lead to frequent misalignment of the subsequent strip material during feeding. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: to provide an in-die material pulling device for step-by-step feeding of a strip material with a thickness ≤ 0.1 mm to prevent the occurrence of misalignment of the strip material during feeding.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0007] An in-die material pulling device for thin strip materials, which is installed inside a stamping die, mainly includes a first hook block, a second hook block, a first lifting mechanism, a second lifting mechanism and a material pulling mechanism;

[0008] Two pieces of the first hook block and the second hook block are provided, and they are respectively located on both sides of the strip material;

[0009] The first lifting mechanism includes a first inclined wedge, a driving block and a sliding block. The driving block is fixed inside the lower die. Two first hook blocks are vertically installed inside the driving block. Two first connecting blocks are installed inside the driving block. A first connecting rod fixed in the first connecting block is fixedly connected to the first hook block. A longitudinal slot one is provided on the side wall of the driving block. The end of the first connecting rod is located inside the longitudinal slot one. An equal-height bolt reversely locked inside the lower die base is fixedly connected to the connecting block. A first spring is sleeved on the equal-height bolt. A sliding slot is provided at the bottom of the driving block corresponding to each first hook block. A sliding block is slidably connected inside each sliding slot. The top of the sliding block is movably connected to the bottom of the first connecting block through an inclined plane structure. The first inclined wedge is installed in the upper die. An elastic block is provided inside the lower die corresponding to the first inclined wedge. A convex block of the sliding block extending outside the driving block is movably connected to the bottom of the elastic block through an inclined plane structure.

[0010] The material pulling mechanism includes a second inclined wedge, a material pulling block and a roller. The material pulling block is slidably connected inside the lower template. A roller is provided on each side of the material pulling block. The second inclined wedge is fixed in the upper die. The inclined plane provided at its bottom is in movable contact with the roller. The second inclined wedge moves downward to drive the material pulling block to move away from the first hook block. A horizontally arranged return spring is provided on one side of the material pulling block relative to the first hook block. A second connecting block is provided inside the material pulling block. A second spring is provided at the bottom of the second connecting block. Two second hook blocks are provided inside the material pulling block. A second connecting rod fixed in the second connecting block is fixedly connected to the second hook block. A longitudinal slot two is provided on the side wall of the material pulling block. The end of the second connecting rod is located inside the longitudinal slot two.

[0011] The second lifting mechanism includes a pressure rod. The pressure rod is installed in the upper die. The bottom of the pressure rod is movably connected to the second connecting rod.

[0012] Therefore, compared with the prior art, the beneficial effects of the present invention are as follows: The second hook block cooperates with the material pulling mechanism to realize the step-by-step material pulling of the material tape. The first hook block remains connected to the material tape at any other time except temporarily disengaging from the material tape during the material pulling process, effectively avoiding the backward movement of the material tape and ensuring the feeding accuracy and feeding quality of the thin material tape. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments.

[0014] Figure 1 It is a schematic cross-sectional view of the die-cutting and stamping die in the first embodiment;

[0015] Figure 2 It is a schematic view of the first lifting mechanism in the first embodiment;

[0016] Figure 3 And 4 is a schematic diagram of the first lifting mechanism (removing the driving block) in the first embodiment;

[0017] Figure 5 is a schematic diagram of the second lifting mechanism and the material pulling mechanism in the first embodiment;

[0018] Figures 6 - 9 is a schematic diagram of the closed die state of the die-cutting and stamping die in the first embodiment;

[0019] Figure 10 is a schematic diagram of the second lifting mechanism and the material pulling mechanism in the second embodiment. Detailed implementation mode

[0020] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments.

[0021] Embodiment 1

[0022] Figure 1 Shown in is a die-cutting and stamping die. The upper die includes an upper die base 10, an upper backing plate 20, an upper clamping plate 30 and a stripper plate 40 arranged in sequence from top to bottom. The stripper plate 40 is fixedly connected to the upper clamping plate 30. The lower die includes a lower template 50, a lower backing plate 60 and a lower die base 70 arranged in sequence from top to bottom.

[0023] A material pulling device is arranged inside the die, which mainly includes a first hook block 81, a second hook block 82, a first lifting mechanism, a second lifting mechanism and a material pulling mechanism. There are two first hook blocks 81 and two second hook blocks 82, which are respectively located on both sides of the strip.

[0024] The first lifting mechanism includes a first wedge 831, a driving block 832 and a slider 833. The driving block is fixed in the lower template 50. Five mounting holes are arranged in the driving block along the width direction of the strip. Among them, first connecting blocks 834 are arranged in mounting holes A and E. Two first hook blocks 81 are respectively arranged in mounting holes B and D. A third connecting block 835 is installed in mounting hole C. A first connecting rod 837 fixed in the first connecting block 834 is fixedly connected to the first hook block 81 and the third connecting block 835. A longitudinal slot 838 communicating with the mounting holes on both sides is arranged on the side wall of the driving block. The end of the first connecting rod is located in the longitudinal slot. The equal-height bolts inverted and locked in the lower die base 70 are fixedly connected to the third connecting block 835. A first spring 836 is sleeved on the equal-height bolts. When the third connecting block 835 is not under an upward thrust, the end of the first connecting rod is located at the lowest end of the longitudinal slot 838, and the first hook block 81 is locked into the mounting hole.

[0025] At the bottom of the driving block 832, a sliding groove 8321 is provided corresponding to each first hook block 81. The top of the slider 833 slidably connected in the sliding groove 8321 is movably connected to the first connecting block 834 through an inclined plane structure. The first wedge 831 is installed in the upper die. Its rod part passes through the stripper plate 40, and the end part is located in the upper clamping plate 30. The elastic mechanism 90 arranged in the upper die base 10 is connected to the end part; an elastic block 839 is provided on the lower template 50 corresponding to the first wedge 831. The bottom of the elastic block is elastically connected to the lower backing plate 60. The convex block 8331 where the slider 833 extends to the outside of the driving block is movably connected to the bottom of the elastic block through an inclined plane structure. A first return spring 8332 connected to the driving block 832 is arranged on one side of the slider relative to the convex block. Preferably, a slot 8391 adapted to the convex block is provided on the bottom side of the elastic block 839. A first inclined plane 8392 is provided on the top wall of the slot corresponding to the slider. A second inclined plane 8332 is provided on the top of the convex block. The first inclined plane 8392 and the second inclined plane 8332 form an inclined plane structure. A first second inclined plane 8333 is provided on the top of the slider 833, and a second second inclined plane 8341 is provided on the bottom of the first connecting block 834 and is movably connected through an inclined plane structure. The first second inclined plane 8333 and the second second inclined plane 8341 form an inclined plane structure.

[0026] The material pulling mechanism includes a second wedge 841, a material pulling block 842 and a roller 843. The material pulling block 842 is slidably connected in the lower template 50. A roller 843 is arranged on each side of the material pulling block 842. The second wedge 841 is fixed in the upper die. Its rod part passes through the upper clamping plate and the stripper plate, and the top is connected to the equal-height sleeve 100 installed in the upper die base; a straight surface 8411 and an inclined surface 8412 located above the straight surface are provided at the inserted end of the bottom of the second wedge 841. The straight surface and the inclined surface are connected by an arc surface 8413. After the second wedge 841 moves downward obliquely, the straight surface first contacts the roller 843, and at this time the material pulling block 842 does not translate. When the inclined surface contacts the roller 843, the material pulling block 842 moves in a direction away from the first hook block 81. A horizontally arranged return spring 845 is arranged on one side of the material pulling block 842 relative to the first hook block 81. After the second wedge 841 moves upward, the return spring drives the material pulling block 842 to reset.

[0027] A second connecting block 846 is arranged in the material pulling block 842. Two second hook blocks 82 are arranged in the material pulling block. The second connecting rod fixed in the second connecting block is fixedly connected to the second hook block 82; a longitudinal strip hole two 848 is arranged on the side wall of the material pulling block. The end part of the second connecting rod is located in the longitudinal strip hole two. A spring two 849 is arranged at the bottom of the second connecting block 846. When the second connecting block 846 is not subject to external force, the second connecting rod is located at the highest point of the longitudinal strip hole two 848, and the second hook block protrudes from the material pulling block 842.

[0028] The second lifting mechanism includes a pressure rod 851. The pressure rod is installed in the upper die, and its installation method in the upper die is the same as that of the first inclined wedge 831, and an elastic mechanism 90 is provided for both, which will not be elaborated here. When the pressure rod moves downward, its bottom is movably connected to the second connecting rod 847, pressing the second hook block 82 into the material pulling block 842 and disengaging it from the material tape.

[0029] The following combines the attached Figures 6 - 9 to introduce the working principle of this device:

[0030] 1. In the open die state, the material tape has completed one step of feeding. The second hook block 82 extends under the spring force of the second spring and inserts into the positioning hole of the material tape. The first hook block 81 retracts into the driving block 832 under the spring force of the first spring 836.

[0031] 2. When the upper die moves downward to close the die, the second inclined wedge 841 contacts the roller 843, the pressure rod contacts the second connecting rod 847 downward, and the first inclined wedge 831 moves downward to contact the elastic block. Before the inclined surface of the second inclined wedge 841 contacts the roller 843, the second hook block 82 disengages from the material tape; at the same time as the second hook block 82 disengages from the material tape, the first hook block 81 rises under the pushing action of the slider 833 and inserts into the material tape.

[0032] 3. When the upper die continues to move downward to close the die, the inclined surface of the second inclined wedge 841 contacts the roller 843, driving the material pulling block 842 to move leftward. When the second connecting rod 847 disengages from the pressure rod, the second hook block 82 extends under the spring force of the second spring and inserts into another set of positioning holes of the material tape.

[0033] 4. When the upper die and the lower die are completely closed, both the first hook block 81 and the second hook block 82 insert into the positioning holes of the material tape.

[0034] 5. When the upper die moves upward and the die opens, the first inclined wedge 831 first disengages from the elastic block. Before the material pulling block 842 resets, the first hook block 81 first disengages from the material tape.

[0035] 6. As the upper die continues to move upward, the inclined surface of the second inclined wedge 841 separates from the roller 843, and the material pulling block 842 moves rightward under the spring force of the reset spring, and the second hook block 82 drives the material tape to move rightward to complete a material pulling action.

[0036] In summary, this device realizes the material pulling action during the opening process of the die, converts the up and down movement of the die into the horizontal reciprocating movement of the second hook block 82, and the cooperation of the two hook blocks makes the step-by-step material pulling process smoother.

[0037] Embodiment 2

[0038] This embodiment is based on Embodiment 1.

[0039] See Figure 10, a locking mechanism is provided on each side of the draw block 842 inside the lower die.

[0040] Specifically, the locking mechanism includes a fixed block 1101 and a locking block 1102. The fixed block is fixed in the lower template 50. The locking block is horizontally arranged between the second cam 841 and the fixed block. A fourth spring is installed between the locking block and the fixed block. The insertion end of the second cam 841 corresponding to the locking block is a connecting surface. A locking groove 8414 is provided on the side surface of the second cam 841. A raised block 8415 is provided between the connecting surface and the locking groove. Guide inclined surfaces are provided on the upper and lower end surfaces of the raised block. After the second cam 841 finishes descending, the raised block is inserted into the locking groove, which can prevent the draw block 842 from moving.

[0041] Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thin material strip in-mold pulling device, characterized in that, Installed inside the stamping die, it mainly includes a first hook block, a second hook block, a first lifting mechanism, a second lifting mechanism and a material pulling mechanism; There are two of both the first hook block and the second hook block, which are respectively located on both sides of the strip; The first lifting mechanism includes a first oblique wedge, a driving block and a slider. The driving block is fixed inside the lower die. Two of the first hook blocks are vertically installed inside the driving block. Two first connecting blocks are installed inside the driving block. A first connecting rod fixed in the first connecting block is fixedly connected to the first hook block; a longitudinal slot one is provided on the side wall of the driving block, and the end of the first connecting rod is located inside the longitudinal slot one; a chute is provided at the bottom of the driving block corresponding to each of the first connecting blocks. The top of the slider slidably connected in the chute is movably connected to the bottom of the first connecting block through an inclined plane structure. The first oblique wedge is installed in the upper die, and an elastic block is provided in the lower die corresponding to the first oblique wedge. The convex block of the slider extending outside the driving block is movably connected to the bottom of the elastic block through an inclined plane structure; The material pulling mechanism includes a second oblique wedge, a material pulling block and a roller. The material pulling block is slidably connected in the lower template. A roller is provided on each side of the material pulling block. The second oblique wedge is fixed in the upper die, and the inclined plane provided at its bottom is in movable contact with the roller. The second oblique wedge moves downward to drive the material pulling block to move away from the first hook block; a horizontally arranged return spring is provided on one side of the material pulling block relative to the first hook block; a second connecting block is provided in the material pulling block, and a spring two is provided at the bottom of the second connecting block; two second hook blocks are provided inside the material pulling block. A second connecting rod fixed in the second connecting block is fixedly connected to the second hook block; a longitudinal slot two is provided on the side wall of the material pulling block, and the end of the second connecting rod is located inside the longitudinal slot two; The second lifting mechanism includes a pressure rod, and the pressure rod is installed in the upper die. The bottom of the pressure rod is movably connected to the second connecting rod.

2. The in-die material pulling device for thin strip materials according to claim 1, characterized in that, A third connecting block fixedly connected to the first connecting rod is installed in the driving block. An equal-height bolt reversely locked in the lower die base is fixedly connected to the third connecting block, and a spring one is sleeved on the equal-height bolt.

3. The in-die material pulling device for thin strip materials according to claim 1, characterized in that, A slot adapted to the convex block is provided on the bottom side surface of the elastic block. A first inclined plane one is provided on the top wall of the slot corresponding to the slider. A first inclined plane two is provided on the top of the convex block. The first inclined plane one and the first inclined plane two constitute the inclined plane structure.

4. The in-die material pulling device for thin strip material according to claim 3, wherein A return spring connecting the slider to the driving block is provided on one side of the slider relative to the convex block.

5. The in-mold material pulling device for thin strip materials according to claim 1, characterized in that, A locking mechanism is provided on each side of the material pulling block inside the lower die; the locking mechanism includes a fixed block and a locking block. The fixed block is fixed in the lower die. The locking block is horizontally arranged between the second oblique wedge and the fixed block. A spring four is installed between the side of the locking block relative to the material pulling block and the fixed block; a locking groove is provided on the side surface of the second oblique wedge. The insertion end surface of the second oblique wedge corresponding to the locking block is a connecting surface. A locking groove is provided on the side surface of the second oblique wedge. A raised block is provided between the connecting surface and the locking groove. Guide inclined planes are provided on the upper and lower end surfaces of the raised block.

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