A stamping die for automatic material pulling and feeding

Abstract

This application relates to a stamping die for automatic material pulling and feeding, which includes a lower die and an upper die that are opened and closed; a material transfer block that is horizontally slidably arranged on the upper side of the lower die; a control hook block that is vertically slidably arranged on the material transfer block, and a material pulling hook for embedding into a material pulling hole is arranged on the upper side of the control hook block, and the material pulling hook abuts against the inner walls of the two sides of the material pulling hole that are symmetric with respect to the hole center; a material transfer linkage assembly, which is connected to the upper die and the material transfer block and is used to make the material transfer block move reciprocally during the opening and closing process of the upper die and the lower die; a control hook linkage assembly, which is connected to the upper die and the control hook block and is used to make the control hook block move reciprocally during the opening and closing process of the upper die and the lower die; wherein before the material transfer block pulls the material tape forward, the material pulling hook is first embedded into the material pulling hole, and before the material transfer block returns backward, the material pulling hook is first disengaged from the material pulling hole. This application has the effects of not only improving the stability of high-speed step-by-step material pulling and feeding, but also enhancing the positioning ability of the material tape to improve the stamping processing accuracy.

Description

Technical Field

[0001] This application relates to the field of stamping devices, and particularly to a stamping die for automatic material pulling and feeding. Background Art

[0002] Stamping relies on a press and a stamping die to apply external force to the stamping material, causing it to deform, thereby obtaining workpieces with specific shapes and dimensions. Among them, a continuous stamping die is a cold stamping die that can perform multiple stampings on the stamping material driven by a press. And for each stamping completed by the continuous stamping die, the stamping material needs to be conveyed downstream by a certain distance from the continuous stamping die until multiple stamping processes are completely finished. However, in order to keep the die structure simple and the equipment cost low, it is expected that the die itself has the function of pulling and feeding materials.

[0003] In related technologies, such as the patent with the publication number CN106541040A and the patent name of Stamping Die Automatic Feeding Mechanism and Stamping Die, the function of automatic material pulling and feeding is realized. The specific working principle is as follows: when the moving block moves in the downstream direction of the material tape walking channel, the material tape is pulled downstream by a step distance through the pulling hook, so that when the stamping die is closed, the required product can be punched. When the driving mechanism drives the moving block and the pulling hook to move upstream, since there is a first inclined surface extending to its top wall on the side of the pulling hook facing the upstream of the material tape walking channel, therefore, during the process of the pulling hook moving upstream with the moving block, the upper part of the pulling hook is guided by its first inclined surface and disengages from the pulling hole until the pulling hook moves in place and is opposite to the pulling hole of the previous step distance, the upper part of the pulling hook inserts into this pulling hole and waits for the next feeding and closing die stamping. Repeating this way, the automatic feeding of the material tape is completed automatically.

[0004] Regarding the above related technologies, there are two problems. First, during the process of hole disengaging, the material tape will float, so the die needs to provide the material tape with the movement space for floating. Therefore, during the process of high-speed stepping movement of the material tape, it is easy to occur that the pulling hook fails to be embedded in the pulling hole, resulting in the failure of the material tape movement. Second, since the size of the pulling hook is slightly smaller than the size of the pulling hole, after the pulling hook moves the material tape once, it cannot completely restrict the displacement of the material tape, resulting in a lower stamping processing accuracy. Summary of the Invention

[0005] In order to improve the stability of high-speed stepping material pulling and feeding while realizing automatic material pulling and feeding, and also enhance the positioning ability of the material tape to improve the stamping processing accuracy, this application provides a stamping die for automatic material pulling and feeding.

[0006] A stamping die for automatic material pulling and feeding provided by this application adopts the following technical solutions:

[0007] A stamping die for automatic material pulling and feeding, comprising:

[0008] A lower die and an upper die which are arranged to open and close;

[0009] A material shifting block, horizontally slidably arranged on the upper side of the lower die;

[0010] A control hook block, vertically slidably arranged on the material shifting block. A material pulling hook for embedding into a material pulling hole is arranged on the upper side of the control hook block, and the material pulling hook abuts against the inner walls of two sides of the material pulling hole that are symmetric with respect to the hole center;

[0011] A material shifting linkage assembly, connected to the upper die and the material shifting block, and used for making the material shifting block perform a reciprocating motion during the opening and closing process of the upper die and the lower die;

[0012] A control hook linkage assembly, connected to the upper die and the control hook block, and used for making the control hook block perform a reciprocating motion during the opening and closing process of the upper die and the lower die;

[0013] Wherein, before the material shifting block pulls the material tape forward, the material pulling hook is first embedded into the material pulling hole, and before the material shifting block returns backward to the initial position, the material pulling hook is first disengaged from the material pulling hole.

[0014] By adopting the above technical solutions, firstly, since the control hook block is slidably arranged on the material shifting block, before the material shifting block returns backward to the initial position, the control hook block can slide downward to disengage the material pulling hook from the material pulling hole, and then the material shifting block returns backward to the initial position. During this process, the material tape does not need to float, so the die does not need to provide space for the material tape to float, and thus the situation that the material pulling hook fails to be embedded into the material pulling hole due to the floating of the material tape will not occur. Furthermore, during the process of high-speed step-by-step movement of the material tape, the situation of material tape movement failure is not likely to occur; secondly, on the premise that the control hook block is slidably arranged, the material pulling hook can abut against the inner walls of two sides of the material pulling hole that are symmetric with respect to the hole center, so that the material pulling hook can precisely limit the material tape, making the material tape unable to displace relative to the material pulling hook, thereby improving the stamping processing accuracy.

[0015] In addition, the reciprocating motion of the control hook block and the reciprocating motion of the material shifting block can be realized by means of the opening and closing of the die under the action of the control hook linkage assembly and the material shifting linkage assembly. Therefore, the die itself has the function of automatic material pulling and feeding, and thus the structure of the die can still be kept simple.

[0016] Preferably, the guiding structure formed by the material shifting linkage assembly is a guiding high position at a position close to the unprocessed area of the material tape.

[0017] By adopting the above technical solution, before the upper die and the lower die are closed, the moving block will move the strip forward by one pitch. Subsequently, when the die is closed, the strip is stationary, and only the upper die moves relative to the lower die. Therefore, there is no need to balance the synchronism between die closing and strip movement, making it easier to achieve higher stamping processing accuracy.

[0018] Preferably, the material transfer linkage assembly includes a downward pressing and returning block and a forward spring. The downward pressing and returning block is arranged on the lower side of the upper die. The downward pressing and returning block is provided with a returning guiding surface and a position retaining guiding surface that are in contact with the material moving block. The returning guiding surface extends obliquely and is used to make the material moving block move backward when the upper die and the lower die are closed. The position retaining guiding surface extends vertically and is closer to the unprocessed area of the strip than the returning guiding surface. The forward spring is connected to the lower die and the material moving block respectively and is used to make the material moving block move forward when the position retaining guiding surface is disengaged from the material moving block.

[0019] By adopting the above technical solution, firstly, the power of the downward movement of the upper die is converted into the acting force of the backward movement of the material moving block through the returning guiding surface, but the acting force of the forward movement of the material moving block comes from the elastic force of the forward spring. In this way, the matching structure between the upper die and the material moving block does not need to be a fully enclosed connection structure with a guide rod and a guide groove, so the assembly difficulty and maintenance difficulty of the die will be reduced. Secondly, due to the setting of the position retaining guiding surface, when the upper die starts to separate from the lower die, the material moving block is still in contact with the position retaining guiding surface. During this process, the material moving block will not move forward immediately, so that the punching die has enough time to leave the area where the strip is located, thus realizing the functions of the die through a simple structure.

[0020] Preferably, the control hook linkage assembly includes a pressing hook block, a floating spring and a pressure maintaining spring. The pressing hook block is vertically slidably arranged on the lower side of the upper die. The lower end surface of the pressing hook block is in contact with the control hook block. When the material moving block moves backward and returns to the initial position, the control hook block disengages from the lower end surface of the pressing hook block. The floating spring is connected to the material moving block and the control hook block respectively and is used to make the control hook block move upward when the control hook block disengages from the lower end surface of the pressing hook block. The pressure maintaining spring is connected to the pressing hook block and the upper die. The elastic force of the pressure maintaining spring is greater than that of the floating spring and is used to keep the pulling hook out of the pulling hole before the material moving block moves backward and returns to the initial position.

[0021] By adopting the above technical solution, during mold closing, the pressing hook block first presses down the control hook block to disengage the material pulling hook from the material tape hole. When the pressing return block comes into contact with the material moving block, the holding pressure spring is gradually compressed to not interfere with the downward movement of the upper mold, and at the same time, sufficient pressure is provided to keep the material pulling hook disengaged from the material tape hole. When the material moving block abuts against the position holding guiding surface, the material moving block has moved backward to its initial position. At the same time, the control hook block disengages from the lower end surface of the pressing hook block, and under the action of the floating spring, the material pulling hook is inserted into the material tape hole, so that during mold closing, the material moving block is prepared for the material tape to move forward again, and at the same time, the power for the whole process comes from the movement of the upper mold without the aid of other power components, thus keeping the structure of the mold simple.

[0022] Preferably, two material pulling hooks are provided, and a displacement seat and a displacement driving assembly are provided between the material pulling hook and the control hook block. The displacement seat slides circularly around the center of the control hook block. One displacement seat is provided for one material pulling hook. One material pulling hook is inserted into one material pulling hole, and one material pulling hook abuts against one side inner wall of the material pulling hole; the displacement driving assembly is connected to the displacement seat.

[0023] By adopting the above technical solution, under the action of the displacement driving assembly, the displacement seat can slide circularly, so that the distance between the material pulling hook and the center of the material tape can be changed to adapt to material tapes of different widths, and the distance between the material pulling hook and the center of the material tape hole can be changed along the length direction of the material tape to adapt to material tape holes of different apertures, so that the mold can dynamically adapt to different processing parameters.

[0024] Preferably, the displacement seat is in the shape of a long bar, and one end of the displacement seat is rotatably connected to the center of the control hook block; the displacement driving assembly includes a displacement slider, a displacement rotating block, a displacement electromagnet and a displacement balance spring. The displacement slider is horizontally slidably arranged, and the movement direction of the displacement slider is parallel to the movement direction of the material moving block; the displacement rotating block is slidably connected to the displacement seat, and the sliding direction of the displacement rotating block is parallel to the length direction of the displacement seat. The displacement rotating block is rotatably connected to the displacement slider; the displacement electromagnet is fixedly arranged on the control hook block, and one displacement slider is provided between two displacement electromagnets. The two displacement electromagnets drive the displacement slider by magnetic attraction; the displacement balance spring is respectively connected to the control hook block and the displacement slider, and is used to balance the magnetic force applied to the displacement slider by the displacement electromagnet.

[0025] By adopting the above technical solution, under the action of the displacement electromagnet and the displacement balance spring, the displacement slider can change its position on the control hook block along the sliding direction of the material moving block. During the movement of the displacement slider, the displacement rotating block will rotate relative to the displacement slider, and a sliding parallel to the length direction of the displacement seat will occur between the displacement rotating block and the displacement seat, so that the sliding of the displacement slider is converted into the rotation of the displacement seat, and thus the driving of the displacement seat to slide circumferentially can be realized. At the same time, the position of the displacement slider can be dynamically changed. Then, during the process of the material moving block moving the material tape forward, the material pulling hook can move backward relative to the material moving block, so that the step distance of the material tape moving forward can be changed, and thus the situation where the material tape needs to move with two different step distances to complete a set of stamping processes can be adapted, and further the processing range adapted by the die can be improved.

[0026] Preferably, the rotating connection parts of the two displacement seats are stacked.

[0027] By adopting the above technical solution, the minimum distance between the material pulling hook and the center of the material tape can be smaller, so as to dynamically adapt to a wider range of processing parameters.

[0028] Preferably, a center distance adjusting seat and a center distance adjusting component are arranged between the material pulling hook and the displacement seat. The center distance adjusting seat is provided for the material pulling hook, and the center distance adjusting seat is slidably arranged along the length direction of the displacement seat; the center distance adjusting component is connected to the center distance adjusting seat.

[0029] By adopting the above technical solution, the material pulling hook can also move along the length direction of the displacement seat, so that the range of change in the distance between the material pulling hook and the center of the material tape can be larger, so as to adapt to material tapes with a larger size range, material tape holes with a larger hole diameter range, and a larger range of step distance change amounts, thereby making the range of processing parameters adapted by the die larger.

[0030] Preferably, the center distance adjusting component includes an input contact block, a distance adjusting electromagnet, a distance adjusting pull block, a distance adjusting connecting rope, and a distance adjusting balance spring. The input contact block is arranged on the upper surface of the control hook block, the distance adjusting electromagnet is arranged on the lower surface of the displacement seat, and the distance adjusting electromagnet is in sliding contact connection with the input contact block; the distance adjusting pull block is slidably arranged along the length direction of the displacement seat, the distance adjusting pull block is located on the lower side of the displacement seat, the distance adjusting pull block is located on one side of the distance adjusting electromagnet away from the rotating connection part of the displacement seat, and the distance adjusting pull block is magnetically attracted by the distance adjusting electromagnet; one end of the distance adjusting connecting rope is connected to one side of the center distance adjusting seat away from the rotating connection part of the displacement seat, the other end is connected to one side of the distance adjusting pull block away from the rotating connection part of the displacement seat, and the middle part passes through the displacement seat; the distance adjusting balance spring is connected to the displacement seat and the center distance adjusting seat, and is used to balance the pulling force exerted on the center distance adjusting seat by the distance adjusting connecting rope.

[0031] By adopting the above technical solution, during the movement of the material transfer block, the input contact block continuously supplies power to the distance adjustment electromagnet. The magnetic force of the distance adjustment electromagnet attracts the distance adjustment pull block to approach the rotational connection of the displacement seat. The magnetic force received by the distance adjustment pull block applies a pulling force away from the rotational connection of the displacement seat to the central distance adjustment seat through the distance adjustment connecting rope. At the same time, under the elastic force of the distance adjustment balance spring, the central distance adjustment seat can be located at different positions of the displacement seat, thereby enabling the adjustment of the position of the material pulling hook on the displacement seat. In addition, except for the components other than the input contact block, the remaining components are distributed along the length direction of the displacement seat, which can also keep the overall structure of the mold simple.

[0032] Preferably, the control hook block is connected with a spring cable, and one end of the spring cable away from the control hook block is fixedly connected to the lower mold.

[0033] By adopting the above technical solution, during the linear movement of the material transfer block and the up-and-down movement of the control hook block, the spring cable can stably transmit current to the input contact block and the displacement electromagnet by virtue of its own characteristics, thereby stably realizing various functions required by the mold through a simple structure.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] Since the control hook block is slidably arranged on the material transfer block, before the material transfer block returns to the initial position backward, the control hook block can slide down to disengage the material pulling hook from the material pulling hole, and then the material transfer block returns to the initial position backward. During this process, the material tape does not need to float, so the mold does not need to provide space for the material tape to float, and thus the situation that the material pulling hook fails to be inserted into the material pulling hole due to the floating of the material tape will not occur. Furthermore, during the process of high-speed step-by-step movement of the material tape, the situation of material tape movement failure is not likely to occur;

[0036] On the premise that the control hook block is slidably arranged, the material pulling hook can abut against the inner walls on both sides of the material pulling hole symmetric with respect to the hole center. In this way, the material pulling hook can precisely limit the material tape so that the material tape cannot displace relative to the material pulling hook, thereby improving the stamping processing accuracy;

[0037] The position of the material pulling hook can be dynamically changed to adapt to material tapes with a larger size range, material tape holes with a larger hole diameter range, and a larger range of step change amounts, thereby expanding the range of processing parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is the overall schematic diagram of the stamping die in the embodiment of the present application.

[0039] Figure 2This is an exploded schematic diagram in the embodiments of the present application to illustrate the cooperation mode of the material transfer linkage component and the control hook linkage component.

[0040] Figure 3 This is an exploded schematic diagram in the embodiments of the present application to illustrate the specific structures of the position-changing drive component and the center distance-adjusting component.

[0041] Figure 4 This is a schematic diagram in the embodiments of the present application to illustrate how to change the moving pitch of the material tape.

[0042] Figure 5 This is a schematic diagram in the embodiments of the present application to illustrate the layout structure of the spring cable and the control hook block on the mold.

[0043] Explanation of reference numerals: 1, lower die; 2, upper die; 3, material transfer block; 4, control hook block; 41, material pulling hook; 42, position-changing seat; 43, center distance-adjusting seat; 5, material transfer linkage component; 51, downward pressure return block; 511, return guiding surface; 512, position-holding guiding surface; 52, forward spring; 6, control hook linkage component; 61, pressure hook block; 62, upward floating spring; 63, pressure-holding spring; 7, position-changing drive component; 71, position-changing slider; 72, position-changing rotating block; 73, position-changing electromagnet; 74, position-changing balance spring; 8, center distance-adjusting component; 81, input contact block; 82, distance-adjusting electromagnet; 83, distance-adjusting pulling block; 84, distance-adjusting connecting rope; 85, distance-adjusting balance spring; 9, spring cable. Detailed implementation manners

[0044] The following further Figures 1 - 5 describes the present application in detail.

[0045] The embodiments of the present application disclose a stamping die for automatic material pulling and feeding.

[0046] Referring to Figure 1 and Figure 2 , the stamping die for automatic material pulling and feeding includes a lower die 1, an upper die 2, a material transfer block 3, a control hook block 4, a material transfer linkage component 5 and a control hook linkage component 6. The lower die 1 is usually fixedly installed on an external frame. The upper die 2 is located above the lower die 1. The upper die 2 can approach or move away from the lower die 1 under the action of components such as an oil cylinder or a cylinder, so as to realize the opening and closing between the upper die 2 and the lower die 1. A metal workpiece can pass between the upper die 2 and the lower die 1. The metal workpiece has a structure of a material tape. At the same time, material tape holes are provided on both sides of the material tape in the width direction. The material tape holes serve as an intermediate medium for an external component to pull the material tape, so that the material tape can continuously move forward through the die to complete stamping processing. In this embodiment, the moving direction of the material tape is taken as the forward direction, and the reverse direction of the moving direction of the material tape is taken as the backward direction.

[0047] Referring to Figure 1 andFigure 2 The material transfer block 3 is horizontally slidably arranged on the upper side of the lower die 1, and the sliding direction is parallel to the moving direction of the strip. The lower die 1 can install the material transfer block 3 by setting guide rails or opening chutes; the control hook block 4 is vertically slidably installed on the material transfer block 3. The material transfer block 3 can be provided with guide rods partially passing through the control hook block 4 to achieve the sliding installation of the control hook block 4. At the same time, a material pulling hook 41 is arranged on the upper surface of the control hook block 4. The material pulling hook 41 will be embedded in the material pulling hole, and the material pulling hook 41 will abut against the inner walls on both sides symmetric with respect to the hole center. In this way, the material pulling hook 41 can limit the strip in two directions, forward and backward, so that the strip cannot displace relative to the material pulling hook 41. After the strip moves into place, the strip is not likely to shift, thereby improving the stamping processing accuracy.

[0048] Refer to Figure 1 and Figure 2 As shown in FIGS. and, the material transfer linkage assembly 5 is connected to the upper die 2 and the material transfer block 3, and the material transfer block 3 will make a reciprocating motion during the opening and closing process of the upper die 2 and the lower die 1; the control hook linkage assembly 6 is connected to the upper die 2 and the control hook block 4, and the control hook block 4 will make a reciprocating motion during the opening and closing process of the upper die 2 and the lower die 1. It should be noted that before the material transfer block 3 pulls the strip forward, the material pulling hook 41 is first embedded in the material pulling hole, and before the material transfer block 3 returns backward, the material pulling hook 41 is first disengaged from the material pulling hole. Since the material pulling hook 41 is disengaged from the material pulling hole when the material transfer block 3 returns backward, the strip will not float during this process, and the mold does not need to provide space for the strip to float, so that the situation where the material pulling hook 41 is not embedded in the material pulling hole due to the strip floating will not occur, and thus the situation where the strip movement fails is not likely to occur during the high-speed step-by-step movement of the strip.

[0049] In addition, in this embodiment, the reciprocating movement of the control hook block 4 and the reciprocating movement of the material transfer block 3 are realized by the opening and closing of the mold. Therefore, the mold itself has the function of automatically pulling and feeding the material, and the structure of the mold can be kept simple.

[0050] Refer to Figure 1 and Figure 2 As shown in FIGS. and, considering that during the stamping process, the relative position accuracy between the strip and the mold will also affect the stamping quality, the following settings are preferably made. The guiding structure formed by the material transfer linkage assembly 5 is a guiding high point at the position close to the unprocessed area of the strip. The guiding high point means that the horizontal height of the guiding structure is higher at the position closer to the rear, that is, the position of the guiding structure closer to the rear is farther from the lower die 1. Then, when the mold is opened, the material transfer block 3 moves the strip forward. When the mold is closed, only the upper die 2 and the lower die 1 move relative to each other. Therefore, it is not necessary to balance the synchronism between the mold closing and the strip movement, and it is easier to achieve higher stamping accuracy.

[0051] Refer toFigure 1 And Figure 2 , considering that the reciprocating motion of the material transfer block 3 is driven by the power of the mold opening and closing processes, the material transfer linkage assembly 5 needs to convert the vertical motion into horizontal motion. Therefore, there must be an inclined structure in the orthogonal direction formed by the vertical and horizontal directions. In order to reduce the assembly difficulty of the mold, the material transfer linkage assembly 5 includes a downward pressing and returning block 51 and a forward spring 52. The downward pressing and returning block 51 is fixedly installed on the lower side of the upper mold 2. The downward pressing and returning block 51 is integrally formed with a return guiding surface 511 and a position retaining guiding surface 512 that are in contact with the material transfer block 3. Among them, the return guiding surface 511 is inclined and extends, so as to convert the downward acting force into the acting force that makes the material transfer block 3 move backward during mold closing.

[0052] Refer to Figure 1 And Figure 2 , the position retaining guiding surface 512 is vertically extended. The position retaining guiding surface 512 is closer to the unprocessed area of the strip than the return guiding surface 511, that is, the position retaining guiding surface 512 is located behind the return guiding surface 511. When the material transfer block 3 is in contact with the position retaining guiding surface 512, the material transfer block 3 moves backward to the initial position, that is, moves to the position closest to the unprocessed area of the strip; the forward spring 52 is respectively connected to the lower mold 1 and the material transfer block 3, and will make the material transfer block 3 move forward when the position retaining guiding surface 512 is disengaged from the material transfer block 3.

[0053] Refer to Figure 1 And Figure 2 , in summary, the material transfer block 3 and the downward pressing and returning block 51 are only in unilateral contact, not bilateral contact such as the front and rear sides, that is, a fully enclosed connection structure similar to the cooperation of a guide rod and a guide groove is not required. Therefore, the assembly difficulty and maintenance difficulty of the mold will be reduced. At the same time, when the mold is just opened, the material transfer block 3 will not move forward immediately, so that the punching die has enough time to leave the area where the strip is located, thereby realizing the functions required by the mold through a simple structure. In addition, considering that the material transfer block 3 needs to pull the strip, the downward pressing and returning block 51 will not be directly in contact with the material transfer block 3, but indirectly in contact with the material transfer block 3. Specifically, a bolt will be installed on both sides of the material transfer block 3, and this bolt will penetrate the lower mold 1. The penetration point is an oval-shaped hole, and this hole cooperates with the bolt to form a necessary structure for the sliding connection of the material transfer block 3, and then this bolt is in contact with the downward pressing and returning block 51.

[0054] Refer to Figure 1 And Figure 2, in this embodiment, there are two trigger times for the hook control linkage assembly 6. One is before the material moving block 3 moves backward, and the hook control linkage assembly 6 needs to lower the hook block 4. The other is before the material moving block 3 moves forward, and the hook control linkage assembly 6 needs to raise the hook block 4. Therefore, there is an interaction between the hook control linkage assembly 6 and the material moving linkage assembly 5. Specifically, the hook control linkage assembly 6 includes a hook pressing block 61, a floating spring 62, and a pressure maintaining spring 63. The hook pressing block 61 is vertically slidably arranged on the lower side of the upper die 2. Specifically, the hook pressing block 61 can slide through the upper die 2. The lower end surface of the hook pressing block 61 abuts against the hook block 4. When the material moving block 3 moves backward to the initial position, the hook block 4 disengages from the lower end surface of the hook pressing block 61 to prepare for the subsequent upward movement of the hook block 4.

[0055] Referring to Figure 1 and Figure 2 , the floating spring 62 is connected to the material moving block 3 and the hook block 4 respectively. When the hook block 4 disengages from the lower end surface of the hook pressing block 61, the floating spring 62 can make the hook block 4 move upward by its elastic force. The pressure maintaining spring 63 is connected to the hook pressing block 61 and the upper die 2. The elastic force of the pressure maintaining spring 63 is greater than that of the floating spring 62. While connecting and installing the hook pressing block 61, it can always press down the hook block 4 to keep the material pulling hook 41 out of the material pulling hole before the material moving block 3 moves backward to the initial position. During the mold closing process, the hook block 4 will move downward to make the material pulling hook 41 out of the material pulling hole to prepare for the backward movement of the material moving block 3. At the same time, when the material moving block 3 moves backward to the initial position, the hook block 4 will move upward to make the material pulling hook 41 embed into the material pulling hole to prepare for the next movement of the material moving block 3 for the strip.

[0056] In summary, during the entire mold closing and mold opening processes, no other power elements are used to realize the movement of the material moving block 3 and the hook block 4, so the structure of the mold can be kept simple.

[0057] Referring to Figure 2 and Figure 3, in order to enable the mold to dynamically adapt to different processing parameters, such as strip materials with different widths, different thicknesses, and different materials, these differences will result in different distances between the strip holes and the center of the strip, as well as different diameters of the strip holes. To adapt to these differences, the following settings are corresponding. A control hook block 4 will have two material pulling hooks 41. A displacement seat 42 and a displacement driving component 7 are arranged between the material pulling hook 41 and the control hook block 4. The displacement seat 42 slides in a circular motion around the center of the control hook block 4. Here, the center line of the strip passes through the center of the control hook block 4. One displacement seat 42 is provided for one material pulling hook 41. One material pulling hook 41 is embedded in one material pulling hole, and one material pulling hook 41 abuts against one side inner wall of the material pulling hole. The displacement driving component 7 is used to drive the displacement seat 42. Then, under the action of the circular motion of the displacement seat 42, the distance between the material pulling hook 41 and the center of the strip can be changed to adapt to strip materials with different widths, and the distance between the material pulling hook 41 and the center of the strip hole can also be changed along the length direction of the strip to adapt to strip holes with different diameters.

[0058] Refer to Figure 2 and Figure 3 , the displacement seat 42 will be in the shape of a long strip. One end of the displacement seat 42 is rotationally connected to the center of the control hook block 4 through a rotating shaft, so that the displacement seat 42 makes a circular slide. At the same time, the displacement driving component 7 will include a displacement slider 71, a displacement rotating block 72, a displacement electromagnet 73, and a displacement balance spring 74. The displacement slider 71 is horizontally slidably arranged, and the moving direction of the displacement slider 71 is parallel to the moving direction of the material moving block 3; the displacement rotating block 72 is slidably connected to the displacement seat 42, and the sliding direction of the displacement rotating block 72 is parallel to the length direction of the displacement seat 42. The displacement rotating block 72 and the displacement slider 71 are rotationally connected through a rotating shaft; the displacement electromagnet 73 is fixedly installed on the upper side of the control hook block 4. One displacement slider 71 is provided between the two displacement electromagnets 73, and the two displacement electromagnets 73 drive the displacement slider 71 through magnetic attraction; the displacement balance spring 74 is respectively connected to the control hook block 4 and the displacement slider 71, and the elastic force of the displacement balance spring 74 is used to balance the magnetic force exerted on the displacement slider 71 by the displacement electromagnet 73.

[0059] Refer to Figure 2 and Figure 3 , in summary, under the action of the displacement electromagnet 73 and the displacement balance spring 74, the displacement slider 71 can change its position on the control hook block 4 along the sliding direction of the material moving block 3. During the movement of the displacement slider 71, the displacement rotating block 72 will rotate relative to the displacement slider 71, and a slide parallel to the length direction of the displacement seat 42 will occur between the displacement rotating block 72 and the displacement seat 42, so that the slide of the displacement slider 71 is converted into the rotation of the displacement seat 42. Therefore, the circular slide of the displacement seat 42 can be realized.

[0060] Refer to Figure 3 and Figure 4, additionally, due to the special structure of the displacement driving component 7, the position of the displacement slider 71 can be dynamically changed, that is, the displacement slider 71 can also move when the material moving block 3 moves. Then, during the process of the material moving block 3 moving the material tape forward, the material pulling hook 41 can move backward relative to the material moving block 3, so that the step distance of the material tape moving forward can be changed. In this working mode, it can adapt to the situation of multi-step processing, that is, to complete a set of stamping processes, it is necessary to move the material tape forward twice, and the two step distances are different, so as to improve the processing range adapted by the mold. At the same time, because the two moving step distances are different, there are usually two material tape hole spacings on this kind of material tape, and the center distances between the material tape holes with different spacings and the material tape are different. Therefore, the displacement seat 42 needs to rotate, rather than just a simple linear motion.

[0061] Among them Figure 4 , mark A is the step distance when the material pulling hook 41 does not move relative to the material moving block 3, mark B is the step distance when the material pulling hook 41 moves relative to the material moving block 3, and mark C is the center line of the material tape.

[0062] Refer to Figure 3 , additionally, in this embodiment, since the displacement seat 42 is a rod-type rotation, the layout areas between the driving elements involved in the two displacement seats 42 are parallel and spaced from each other. Therefore, the relevant driving elements will not overlap or converge. Therefore, the rotating connection parts of the two displacement seats 42 can be stacked together to make the minimum distance between the material pulling hook 41 and the center of the material tape smaller while keeping the mold structure simple, so as to dynamically adapt to a wider range of processing parameters.

[0063] Refer to Figure 3 , the size range of the processing parameters dynamically adapted by the mold depends on how large the distance change range between the material pulling hook 41 and the center of the material tape can be. The larger it is, the larger the size range of the material tape, the larger the aperture range of the material tape holes, and the larger the step distance change amount that can be adapted. Then, there is the following setting. A center distance adjusting seat 43 and a center distance adjusting component 8 are arranged between the material pulling hook 41 and the displacement seat 42. The center distance adjusting seat 43 is located above the displacement seat 42. The center distance adjusting seat 43 is for setting the material pulling hook 41. The center distance adjusting seat 43 is slidably arranged along the length direction of the displacement seat 42. Specifically, a guide rail can be used to realize the sliding installation of the center distance adjusting seat 43, so as to change the position of the material pulling hook 41 on the displacement seat 42, and thus expand the distance change range between the material pulling hook 41 and the center of the material tape.

[0064] Refer to Figure 3, the center distance adjustment component 8 is connected to the center distance adjustment seat 43. The center distance adjustment component 8 includes an input contact block 81, a distance adjustment electromagnet 82, a distance adjustment pull block 83, a distance adjustment connecting rope 84, and a distance adjustment balance spring 85. The input contact block 81 is fixedly installed on the upper surface of the hook control block 4. The distance adjustment electromagnet 82 is arranged on the lower surface of the displacement seat 42. The distance adjustment electromagnet 82 is in sliding contact connection with the input contact block 81. The distance adjustment pull block 83 is slidably arranged along the length direction of the displacement seat 42. Specifically, a guide rail can be used to realize the sliding connection between the distance adjustment pull block 83 and the displacement seat 42. The distance adjustment pull block 83 is located on the lower side of the displacement seat 42. The distance adjustment pull block 83 is located on one side of the distance adjustment electromagnet 82 away from the rotation connection of the displacement seat 42. The distance adjustment pull block 83 is magnetically attracted by the distance adjustment electromagnet 82. One end of the distance adjustment connecting rope 84 is connected to one side of the center distance adjustment seat 43 away from the rotation connection of the displacement seat 42, and the other end is connected to one side of the distance adjustment pull block 83 away from the rotation connection of the displacement seat 42. The middle part passes through the displacement seat 42. The distance adjustment balance spring 85 is connected to the displacement seat 42 and the center distance adjustment seat 43. The elastic force of the distance adjustment balance spring 85 balances the pulling force applied to the center distance adjustment seat 43 by the distance adjustment connecting rope 84.

[0065] Refer to Figure 3 , the working principle is as follows. The input contact block 81 continuously supplies power to the distance adjustment electromagnet 82 during the movement of the material transfer block 3. The magnetic force of the distance adjustment electromagnet 82 attracts the distance adjustment pull block 83 to approach the rotation connection of the displacement seat 42. The magnetic force received by the distance adjustment pull block 83 applies a pulling force to the center distance adjustment seat 43 away from the rotation connection of the displacement seat 42 through the distance adjustment connecting rope 84. At the same time, under the action of the elastic force of the distance adjustment balance spring 85, the center distance adjustment seat 43 can be located at different positions on the displacement seat 42, so that the position adjustment of the material pulling hook 41 on the displacement seat 42 can be realized. And this adjustment is a dynamic adjustment, so it can adapt to the mode of the high-speed step-by-step moving material belt. In addition, for the components of the center distance adjustment component 8 other than the input contact block 81, the rest of the components are distributed along the length direction of the displacement seat 42, which can also keep the overall structure of the mold simple.

[0066] Refer to Figure 3 and Figure 5 , since both the displacement electromagnet 73 and the distance adjustment electromagnet 82 need to be energized to work, but the material transfer block 3 will move horizontally and the hook control block 4 will move up and down. Therefore, in order to maintain the working stability of the two electromagnets, the hook control block 4 is connected with a spring cable 9. One end of the spring cable 9 away from the hook control block 4 is connected to the lower mold 1, so that the characteristics of the spring cable 9 can stably realize the functions required by the mold through a simpler structure.

[0067] The implementation principle of a stamping die with automatic material pulling and feeding in an embodiment of this application is as follows: Since the control hook block 4 is slidably arranged on the material transfer block 3, before the material transfer block 3 returns to the initial position backward, the control hook block 4 can slide down to make the material pulling hook 41 disengage from the material pulling hole, and then the material transfer block 3 returns to the initial position backward. During this process, the material tape does not need to float, so the die does not need to provide space for the material tape to float, thus avoiding the situation that the material pulling hook 41 fails to be inserted into the material pulling hole due to the floating of the material tape. Furthermore, during the process of high-speed step-by-step movement of the material tape, it is not easy to have the situation of material tape movement failure. At the same time, the material pulling hook 41 can abut against the inner walls on both sides of the material pulling hole that are symmetric with respect to the hole center. In this way, the material pulling hook 41 can precisely limit the material tape, so that the material tape cannot displace relative to the material pulling hook 41, thereby improving the stamping processing accuracy.

[0068] The above are all preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A stamping die for automatic material pulling and feeding, characterized in that: Including: A lower die (1) and an upper die (2) which are arranged to be opened and closed; A material transfer block (3), horizontally slidably arranged on the upper side of the lower die (1); A control hook block (4), vertically slidably arranged on the material transfer block (3), a material pulling hook (41) for embedding into a material pulling hole is arranged on the upper side of the control hook block (4), and the material pulling hook (41) abuts against the inner walls of two sides of the material pulling hole that are symmetric with respect to the hole center; A material transfer linkage assembly (5), connected to the upper die (2) and the material transfer block (3), and used for enabling the material transfer block (3) to perform a reciprocating motion during the opening and closing process of the upper die (2) and the lower die (1); A control hook linkage assembly (6), connected to the upper die (2) and the control hook block (4), and used for enabling the control hook block (4) to perform a reciprocating motion during the opening and closing process of the upper die (2) and the lower die (1); Wherein, before the material transfer block (3) pulls the material tape forward, the material pulling hook (41) is first embedded into the material pulling hole, and before the material transfer block (3) returns backward, the material pulling hook (41) is first disengaged from the material pulling hole; There are two material pulling hooks (41), a displacement seat (42) and a displacement driving assembly (7) are arranged between the material pulling hook (41) and the control hook block (4), the displacement seat (42) slides in a circular motion around the center of the control hook block (4), one displacement seat (42) is provided for one material pulling hook (41), one material pulling hook (41) is embedded into one material pulling hole, and one material pulling hook (41) abuts against one side inner wall of the material pulling hole; the displacement driving assembly (7) is connected to the displacement seat (42); The displacement seat (42) is in the shape of a long strip rod, and one end of the displacement seat (42) is rotatably connected to the center of the control hook block (4); the displacement driving assembly (7) includes a displacement slider (71), a displacement rotating block (72), a displacement electromagnet (73) and a displacement balancing spring (74), the displacement slider (71) is horizontally slidably arranged, and the movement direction of the displacement slider (71) is parallel to the movement direction of the material transfer block (3); the displacement rotating block (72) is slidably connected to the displacement seat (42), the sliding direction of the displacement rotating block (72) is parallel to the length direction of the displacement seat (42), and the displacement rotating block (72) is rotatably connected to the displacement slider (71); the displacement electromagnet (73) is fixedly arranged on the control hook block (4), one displacement slider (71) is arranged between two displacement electromagnets (73), and the two displacement electromagnets (73) drive the displacement slider (71) through magnetic attraction; the displacement balancing spring (74) is respectively connected to the control hook block (4) and the displacement slider (71), and is used for balancing the magnetic force applied by the displacement electromagnet (73) to the displacement slider (71).

2. The stamping die for automatic material pulling and feeding according to claim 1, characterized in that: The guiding structure formed by the material transfer linkage assembly (5) is a guiding high position at a position close to the unprocessed area of the material tape.

3. The stamping die for automatic material pulling and feeding according to claim 2, wherein: The material transfer linkage assembly (5) includes a downward pressing and returning block (51) and a forward spring (52). The downward pressing and returning block (51) is arranged on the lower side of the upper die (2). The downward pressing and returning block (51) is provided with a returning guiding surface (511) and a position maintaining guiding surface (512) that are in contact with the material transfer block (3). The returning guiding surface (511) extends obliquely and is used to make the material transfer block (3) move backward when the upper die (2) and the lower die (1) are closed. The position maintaining guiding surface (512) extends vertically and is closer to the unprocessed area of the strip than the returning guiding surface (511). The forward spring (52) is connected to the lower die (1) and the material transfer block (3) respectively, and is used to make the material transfer block (3) move forward when the position maintaining guiding surface (512) is disengaged from the material transfer block (3).

4. The stamping die for automatic material pulling and feeding according to claim 3, characterized in that: The control hook linkage assembly (6) includes a pressing hook block (61), a floating spring (62) and a pressure maintaining spring (63). The pressing hook block (61) is vertically slidably arranged on the lower side of the upper die (2). The lower end surface of the pressing hook block (61) is in contact with the control hook block (4). When the material transfer block (3) returns backward to the initial position, the control hook block (4) disengages from the lower end surface of the pressing hook block (61). The floating spring (62) is connected to the material transfer block (3) and the control hook block (4) respectively, and is used to make the control hook block (4) move upward when the control hook block (4) disengages from the lower end surface of the pressing hook block (61). The pressure maintaining spring (63) is connected to the pressing hook block (61) and the upper die (2). The elastic force of the pressure maintaining spring (63) is greater than that of the floating spring (62), and is used to keep the material pulling hook (41) out of the material pulling hole before the material transfer block (3) returns backward to the initial position.

5. The stamping die for automatic material pulling and feeding according to claim 1, characterized in that: The rotating connection parts of the two position changing seats (42) are stacked.

6. The stamping die for automatic material pulling and feeding according to claim 1, characterized in that: A center distance adjusting seat (43) and a center distance adjusting assembly (8) are arranged between the material pulling hook (41) and the position changing seat (42). The center distance adjusting seat (43) is provided for the material pulling hook (41) and is slidably arranged along the length direction of the position changing seat (42). The center distance adjusting assembly (8) is connected to the center distance adjusting seat (43).

7. The stamping die for automatically pulling and feeding materials according to claim 6, wherein: The central distance adjustment assembly (8) includes an input contact block (81), a distance adjustment electromagnet (82), a distance adjustment pull block (83), a distance adjustment connecting rope (84), and a distance adjustment balance spring (85). The input contact block (81) is arranged on the upper surface of the hook control block (4). The distance adjustment electromagnet (82) is arranged on the lower surface of the displacement seat (42). The distance adjustment electromagnet (82) is in sliding contact connection with the input contact block (81). The distance adjustment pull block (83) is slidably arranged along the length direction of the displacement seat (42). The distance adjustment pull block (83) is located on the lower side of the displacement seat (42). The distance adjustment pull block (83) is located on one side of the distance adjustment electromagnet (82) away from the rotation connection of the displacement seat (42). The distance adjustment pull block (83) is magnetically attracted by the distance adjustment electromagnet (82). One end of the distance adjustment connecting rope (84) is connected to one side of the central distance adjustment seat (43) away from the rotation connection of the displacement seat (42), and the other end is connected to one side of the distance adjustment pull block (83) away from the rotation connection of the displacement seat (42). The middle part penetrates through the displacement seat (42). The distance adjustment balance spring (85) is connected to the displacement seat (42) and the central distance adjustment seat (43) for balancing the pulling force applied to the central distance adjustment seat (43) by the distance adjustment connecting rope (84).

8. The stamping die for automatic material pulling and feeding according to claim 7, characterized in that: The hook control block (4) is connected with a spring cable (9). One end of the spring cable (9) away from the hook control block (4) is fixedly connected to the lower die (1).

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