Sectional type one-time punching die and punching method

Abstract

The invention relates to the technical field of punching machining, and discloses a sectional type one-time punching die and a punching method.The sectional type one-time punching die comprises an upper die and a lower die, the upper die comprises at least two sets of upper die inserts, the lower die comprises a punching core block, at least two sets of lower die inserts and a punch, and the punching core block is provided with a punching station for a product to be placed in; the lower die inserts are connected with the punches, matching parts are arranged on the lower die inserts and the upper die inserts, the matching parts of the two sets of upper die inserts are matched with the matching parts of the two sets of lower die inserts in a staggered mode, sectional type punching is achieved, the left side and the right side of a fork are punched through two punching stages respectively, waste materials are prevented from being clamped in the die, and punching efficiency is improved. And the step of manually rotating the workpiece is avoided through the one-time punching and segmented punching mode, the machining efficiency is improved, due to the fact that the workpiece does not need to be rotated, and the punching core block with the small fit clearance is arranged, the coaxiality and flatness of product machining are guaranteed, the machining precision is improved, and the product quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of punching processing, in particular to a segmented one-time punching die and a punching method. Background Art

[0002] Punching is a common processing method, which is widely used in the processing of various metal materials. Traditional punching dies usually adopt a step-by-step punching method, that is, during the punching process, the holes on both sides of the workpiece are punched out twice.

[0003] However, this traditional punching method has some problems when processing certain specific shapes and high-precision workpieces, such as the U-shaped fork part of the automobile chassis brake push rod assembly: because the fork part of the push rod assembly is thicker than 3.5mm and the inner width of the fork is less than 8mm, the traditional synchronous punching method will cause waste to get stuck in the mold and cannot be processed normally; and the traditional two-punching method can avoid the waste from getting stuck, but it requires manual rotation of the workpiece, which is inefficient, and the coaxiality and aperture accuracy and position are difficult to control. In addition, due to the large gap in the design of the punching core block, the coaxiality and the flatness of the fork surface cannot be guaranteed, resulting in low processing accuracy and a low mold service life. In addition, the traditional punching mold cannot prevent the error of unqualified fork mouth width.

[0004] Therefore, the existing punching dies have problems such as low efficiency, poor precision, short die life, and inability to prevent errors in processing such as the fork hole part of the push rod assembly, and cannot meet the needs of actual production. In response to the above problems, this application is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a segmented one-time punching die and a punching method, which completes the punching process by a one-time punching segmented punching method, thereby solving the problem of poor precision in traditional synchronous punching processing and the problem of low processing efficiency caused by the need to manually rotate the workpiece.

[0006] The present invention is achieved through the following technical solutions.

[0007] A segmented one-time punching die according to the present invention comprises an upper die and a lower die, wherein the upper die comprises at least two groups of upper die inserts, the lower die comprises a punching core block, at least two groups of lower die inserts and a punch, the punching core block is provided with a punching station for product placement, the punching station is arranged throughout the punching core block, the punching station is a contoured structure, which matches the shape of the product to be punched and plays a role in positioning and fixing the product, in addition, a space for waste material discharge is also provided in the punching core block, the lower die insert is connected to the punch, the lower die insert can move along a set path, the lower die insert and the upper die insert are both provided with matching parts, when punching operation is performed, after the matching parts of the lower die insert and the upper die insert come into contact, the lower die insert and the punch move to perform punching, the matching parts of the two groups of upper die inserts are staggered to contact with the matching parts of the two groups of lower die inserts, the first section of punching and the second section of punching are completed in sequence, and segmented punching is realized.

[0008] Optionally, when the number of punching holes required for the product is greater than two, more than two groups of lower die inserts and upper die inserts may be provided.

[0009] Preferably, the lower die insert, the upper die insert and the punching core block are all detachably arranged to facilitate adaptation to different product types.

[0010] Furthermore, the segmented one-time punching die also includes a waste removing mechanism. After each punching work is completed, the waste removing mechanism removes the punching waste to avoid the problem that the waste is stuck in the die and subsequent normal processing cannot be performed.

[0011] Furthermore, the segmented one-time punching die also includes a feeding mechanism, which is used to feed the product into the punching core block.

[0012] Optionally, the feeding mechanism may adopt automatic feeding or manual feeding, and the automatic feeding may adopt a robot or the like.

[0013] Furthermore, the feeding mechanism includes a feeding slider that can move along a set path. The feeding slider realizes feeding by moving in the direction of the punching core block. The feeding slider can be connected to the linear drive module to realize automatic feeding, or it can be manually pushed to feed. The feeding slider is provided with a mounting hole that matches the shape of the product. Taking the U-shaped fork of the automobile chassis brake push rod assembly as an example, it has a hexagonal rod portion, and the mounting hole is also set as a hexagonal hole, so that the mounting hole can play an error-proofing role and prevent products with hexagonal rods that are too large or too small from entering the processing.

[0014] Furthermore, the segmented one-time punching die also includes a buffer mechanism, the buffer structure includes a buffer top material block and a buffer elastic part, the buffer top material block is connected to the buffer elastic part, the buffer top material block is arranged at the punching station, and is used to buffer the product entering the punching station. When the product enters the punching station, the buffer top material block has a certain thrust under the action of the buffer elastic part to block the part to be punched, so that it will not collide when pushed in, and at the same time, the positioning gap is eliminated, so that more stable punching can be achieved under the vibration of the punching machine.

[0015] Furthermore, the lower die also includes a baffle, a guide rod and a reset elastic member. The guide rod is connected to the reset elastic member and is movably installed on the baffle. The lower die insert is connected to the guide rod. The lower die insert moves after being squeezed by the upper die insert. The guide rod guides its movement to ensure stability. When the matching parts of the upper die insert and the lower die insert are disengaged, the lower die insert and the punch are reset and exited under the action of the reset elastic member.

[0016] Furthermore, the waste removal mechanism includes an air blowing pipe, generally an air blowing copper pipe, which is connected to an air source and removes waste by blowing air.

[0017] Furthermore, the feeding mechanism and the buffer mechanism are both arranged on the lower mold.

[0018] Furthermore, the matching parts are all inclined surface structures, and transmission is achieved through contact of the inclined surfaces.

[0019] Furthermore, the two groups of upper mold inserts are arranged with one long and one short, and the inclined surface structure is arranged at the end position of the upper mold insert, so as to achieve staggered contact of the matching parts.

[0020] Furthermore, the segmented one-time punching mold also includes a sensor component, which is used to detect whether there is a human body in the working area. The sensor component can be selected as an infrared sensor, an image sensor, etc. When the sensor component detects that there is a human body in the working area, the mold closing action is not performed.

[0021] A punching method, based on the above-mentioned segmented one-time punching die, comprises the following steps:

[0022] A punching station for placing the product into the punching core block;

[0023] Execute the mold closing action, and the upper mold and the lower mold move relative to each other;

[0024] The first punching step: the mating part of one of the upper die inserts contacts and matches with the mating part of one of the lower die inserts, the punch moves to complete the punching of the first hole, the mating parts are disengaged, the punch withdraws, and the waste removal mechanism removes the punching waste;

[0025] The second punching step: the upper die continues to move toward the lower die, the mating part of the other upper die insert contacts and cooperates with the mating part of the other lower die insert, the punch moves to complete the punching of the second hole, the waste removal mechanism removes the punching waste, and the punching of both sides of the product is completed.

[0026] The beneficial effects of the present invention include: a staged punching method that avoids the groove of the mold insert, and respectively punches the left and right sides of the fork in two punching stages, thereby avoiding waste material from being stuck in the mold and improving processing efficiency and precision; and a one-time punching method of segmented punching avoids the step of manually rotating the workpiece, thereby improving processing efficiency; since there is no need to rotate the workpiece, the punching core block with a smaller clearance is used to ensure the coaxiality and flatness of the product processing, thereby improving processing precision and ensuring product quality.

[0027] By setting a feeding slide block, a mounting hole matching the shape of the product is provided in the feeding slide block, which plays an error-proofing role and prevents products that are too large or too small from entering the processing.

[0028] By setting up a buffer mechanism, the product can be pushed in without collision, and the positioning gap is eliminated, so that the punching can be more stable under the vibration of the punch press, which improves the processing stability and prolongs the service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Figure 1 It is a schematic diagram of the overall structure of the segmented one-time punching die;

[0032] Figure 2 It is a structural schematic diagram of the lower mold;

[0033] Figure 3 for Figure 2 Schematic diagram of the cross section at AA;

[0034] Figure 4 for Figure 2 Schematic diagram of the cross section at BB;

[0035] Figure 5 This is a schematic diagram of the product structure. DETAILED DESCRIPTION

[0036] Combine the following Figure 1-Figure 5 The present invention is described in detail.

[0037] Embodiment 1:

[0038] A segmented one-time punching die of the present invention comprises an upper die 21, a lower die 22 and a waste material removing mechanism.

[0039] like Figure 1 The upper mold 21 includes an upper mold pad 222, an upper fixed plate 223, an upper mold plate 221 and two groups of upper mold inserts. The upper fixed plate 223 connects the upper mold plate 221 and the two groups of upper mold inserts. A matching part is provided on the upper mold insert. The matching part adopts an inclined surface structure in this embodiment. In other embodiments, any other transmission structure that can convert vertical motion into horizontal motion can also be adopted.

[0040] In this embodiment, the upper mold inserts are arranged in a long and short configuration, namely a long upper mold insert 12 and a short upper mold insert 13. The inclined surface structure is arranged at the end positions of the upper mold inserts, thereby achieving staggered contact of the mating parts.

[0041] In other embodiments, the upper mold inserts can also be set to be of equal length, and the matching parts can achieve a staggered matching effect at different positions.

[0042] The lower die 22 includes a lower die plate 1 , a punching core block 7 , at least two groups of lower die inserts 11 and a punch 6 .

[0043] like Figure 2-Figure 4 The punching core block 7 is provided with a punching station 4 for placing the product. The punching station 4 is arranged throughout the punching core block 7. The punching station is a contoured structure that matches the shape of the product to be punched. The gap is small, which plays a role in positioning and fixing the product, can improve processing accuracy and reduce waste generation.

[0044] A baffle plate 15 is installed on the lower mold plate 1, and a guide rod 16 is slidably installed on the baffle plate 15. A reset elastic member 17 is installed on the guide rod 16. The reset elastic member 17 adopts a spring, and the spring is located between the tail end of the guide rod 16 and the baffle plate 15. The lower die insert 11 is connected to the guide rod 16. After the matching parts are in contact, the lower die insert 11 moves after being squeezed by the upper die insert. The guide rod 16 guides its movement to ensure stable movement. When the matching parts of the upper die insert and the lower die insert 11 are disengaged, under the action of the reset elastic member 17, the lower die insert 11 and the punch 6 are reset and exited, which is convenient for the waste blowing operation.

[0045] The lower die insert 11 is connected to the punch 6, and one end of the punch 6 extends to the punching core block 7. Figure 3The matching part 111 on the lower die insert 11 is set as a convex structure with a triangular cross-section, and the lower side of the matching part 111 forms an air avoidance position 10. When punching, after the matching parts of the lower die insert 11 and the upper die insert come into contact, the lower die insert 11 and the punch 6 move to punch, and the matching parts of the two groups of upper die inserts are staggered to contact the matching parts of the two groups of lower die inserts 11, and the first section of punching and the second section of punching are completed in turn to realize segmented punching. After each punching work is completed, the waste removal mechanism removes the punching waste to avoid the problem that the waste is stuck in the mold and the subsequent normal processing cannot be carried out.

[0046] In this embodiment, the waste removal mechanism includes an air blowing pipe 23, which is generally an air blowing copper pipe, connected to the air source, guiding the gas to blow in a specified direction, and blowing away the waste and foreign matter, such as Figure 2 , 3 , generally arranged above the punching core block 7, and may also be integrated on the lower die 22. The punching core block 7 is provided with a channel 71 located between the punching stations 4 and connected thereto, and the air blowing tube 23 is inserted through the channel 71, and the channel 71 is for air flow to enter, and part of the waste generated by punching can also be discharged therefrom.

[0047] In other embodiments, the waste removal mechanism may also use a water flushing mechanism, a sweeping structure, etc. to remove waste.

[0048] Preferably, a sensor assembly 3 is installed on the lower mold plate 1, and the sensor assembly 3 is used to detect whether there is a human body in the working area. The sensor assembly 3 is preferably an infrared sensor. When the sensor assembly 3 detects the presence of a human body in the working area, the mold closing action is not performed. The sensor assembly 3 can be electrically connected to the driving structure of the upper mold 21 to ensure the safety of the operation.

[0049] Preferably, the lower die insert 11, the upper die insert and the punching core block are all designed to be replaceable, so as to facilitate the maintenance and replacement of the mold.

[0050] In this embodiment, the punching core block 7 has a small gap, which can ensure the processing accuracy and coaxiality, avoid the problem of waste material getting stuck, and improve the processing efficiency.

[0051] Through the above scheme, a segmented punching die and a processing method thereof can be realized, which improves the processing efficiency, precision and die life, while also ensuring the safety of operation and processing quality.

[0052] Embodiment 2:

[0053] On the basis of Example 1, a feeding mechanism is added in this embodiment to facilitate feeding and to prevent errors, thereby preventing products from being processed incorrectly.

[0054] like Figure 2 , Figure 4 The feeding mechanism includes a feeding slider 5 that can move along a set path. A slide rail 2 is provided on the lower template 1. The feeding slider 5 is installed on the slide rail 2. The feeding slider 5 realizes feeding by moving toward the punching core block 7 and plays an auxiliary role in fixing the product. The feeding slider 5 can be connected to the linear drive module to realize automatic feeding, or it can be manually pushed to load.

[0055] The loading slide block 5 is provided with a mounting hole 51 matching the shape of the product. The processed product in this embodiment takes the U-shaped fork 30 of the automobile chassis brake push rod assembly as an example, which has a hexagonal rod portion 31, and the mounting hole 51 is also configured as a hexagonal hole, so that the mounting hole 51 can play an error-proofing role and prevent products with hexagonal rods that are too large or too small from entering the processing.

[0056] Embodiment 3:

[0057] On the basis of the embodiment 2, a buffer mechanism is added in this embodiment to prevent the product from being bumped when entering the punching core block 7 .

[0058] Specifically, Figure 2 The buffer structure includes a buffer ejection block 9 and a buffer elastic member 8. The buffer ejection block 9 is connected to the buffer elastic member 8. The buffer elastic member 8 is a spring and is mounted on the guide rod position of the buffer ejection block 9. The guide rod of the buffer ejection block 9 cooperates with the guide hole provided on the lower template 1. The buffer ejection block 9 is arranged at the end position of the punching station 4 to buffer the product entering the punching station 4. When the product enters the punching station 4, the buffer ejection block 9 is acted upon by the buffer elastic member 8 to have a certain thrust to block the part to be punched, so that it does not collide when pushed in, and at the same time eliminates the positioning gap, so that the punching can be more stable under the vibration of the punching machine, thereby improving the processing stability and extending the service life of the mold.

[0059] Compared with the prior art, this technical solution mainly solves: 1. The assembly problems of coaxiality and overall position. 2. The problem of waste material getting stuck: The traditional synchronous punching method will cause waste material to get stuck in the mold, and the fork hole part of the push rod assembly cannot be processed normally. This technical solution adopts the die insert groove avoidance and punching in stages to avoid the problem of waste material getting stuck. 3. The problem of low efficiency: The traditional two-time punching method requires manual rotation of the workpiece, which is inefficient. This technical solution adopts one-time stamping and segmented punching, which avoids the step of manual rotation of the workpiece and improves processing efficiency. 4. The problem of poor precision: Due to the large gap design of the traditional punching core block, the coaxiality is above Φ0.4, the position is about 0.8-1.5, and the coaxiality and the flatness of the fork surface above 0.2 cannot be guaranteed, resulting in low processing accuracy. This technical solution can reduce the gap of the punching core block by punching in stages, improve the processing accuracy, and the coaxiality can be within Φ0.2, the position accuracy can be within 0.4, and the flatness can be within 0.1. When placing the workpiece to be processed, the punching core block can prevent the fork opening from being misplaced to produce unqualified parts and damage the mold, thereby extending the service life of the mold.

[0060] A punching method comprises the following steps:

[0061] Step 1: Install the mold. Install the mold on the punch press, adjust the position of the mold, and ensure that the mold can work normally;

[0062] Step 2: Place the workpiece to be processed. Insert the hexagonal rod 31 of the U-shaped fork 30 to be processed into the mounting hole 51 to ensure that the U-shaped fork 30 can be accurately aligned with the punching station 4, and also prevent the hexagonal rod 31 from being too large or too small;

[0063] Step 3: Push the loading slide block 5 to make the U-shaped fork 30 enter the punching station 4. The buffering top block 9 is acted upon by the buffering elastic member 8 to have a certain thrust to block the workpiece to be punched, so that it does not collide when pushed in, and at the same time eliminates the positioning gap, so that the punching can be more stable under the vibration of the punching machine;

[0064] Step 4: Infrared sensor detection. The sensor component 3 detects whether there is an arm in the danger zone. If there is no danger, the punch press will press down. Figure 2 , the long upper die insert 12 first enters the lower die insert 11 on the right side, the inclined surface structure cooperates, the punch 6 punches into the U-shaped fork 30 to process the fork plate hole 32 on the right side, and the punching is achieved while the stroke is in place, and the air blowing tube 23 blows in air to blow away waste and foreign matter. When the matching part of the long upper die insert 12 is pressed into the avoidance position 10, the inclined surface is out of cooperation, and the punch 6 is rebounded and reset by the spring, and the upper template continues to be pressed downward, so that the short upper die insert 13 can punch the left fork plate hole and reach the stroke at the same time, and the waste blowing copper tube blows in air to blow away waste and foreign matter;

[0065] Step 5: Punching is completed. Then the upper die 21 returns to its original position and rises to its original position, and the loading slide block 5 is pulled out to take out the product.

[0066] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology in this field to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A segmented one-time punching die, characterized in that: The invention comprises an upper die (21) and a lower die (22), wherein the upper die (21) comprises at least two groups of upper die inserts, and the lower die (22) comprises a punching core block (7), at least two groups of lower die inserts (11) and a punch (6). The punching core block (7) is provided with a punching station (4) for placing a product, and the lower die insert (11) is connected to the punch (6). Both the lower die insert (11) and the upper die insert are provided with a matching portion. When performing a punching operation, after the matching portions of the lower die insert (11) and the upper die insert are driven to match, the lower die insert (11) and the punch (6) move to perform punching, and the matching portions of the two groups of upper die inserts are staggered to match with the matching portions of the two groups of lower die inserts (11) to achieve segmented punching.

2. The segmented one-time punching die according to claim 1, characterized in that: The segmented one-time punching die also includes a waste removal mechanism, which removes the punching waste after each punching work is completed.

3. The segmented one-time punching die according to claim 2, characterized in that: The segmented one-time punching die also includes a feeding mechanism, which is used to feed the product into the punching core block (7).

4. The segmented one-time punching die according to claim 3, characterized in that: The feeding mechanism comprises a feeding slide block (5) capable of moving along a set path, and a mounting hole (51) matching the shape of the product is provided in the feeding slide block (5).

5. The segmented one-time punching die according to claim 4, characterized in that: The segmented one-time punching die also includes a buffer mechanism, the buffer structure including a buffering top block (9) and a buffering elastic member (8), the buffering top block (9) being connected to the buffering elastic member (8), the buffering top block (9) being arranged at the punching station (4) and used for buffering the product entering the punching station (4).

6. The segmented one-time punching die according to any one of claims 1 to 5, characterized in that: The lower die (22) further comprises a baffle (15), a guide rod (16) and a resetting elastic member (17); the guide rod (16) is connected to the resetting elastic member (17) and is movably mounted on the baffle (15); and the lower die insert (11) is connected to the guide rod (16).

7. The segmented one-time punching die according to any one of claims 1 to 5, characterized in that: The matching parts are all inclined structures.

8. The segmented one-time punching die according to claim 7, characterized in that: The two groups of upper mold inserts are arranged with one long and one short, and the inclined surface structure is arranged at the end position of the upper mold insert.

9. The segmented one-time punching die according to any one of claims 1 to 5, characterized in that: The segmented one-shot punching die further comprises a sensor component (3), wherein the sensor component (3) is used to detect whether a human body is present in the working area.

10. A punching method, based on the segmented one-time punching die according to any one of claims 1 to 9, characterized in that: The following steps are involved: Placing the product into a punching station (4) in a punching core block (7); Performing a mold closing action, the upper mold (21) and the lower mold (22) move relative to each other; The first punching step: the mating portion of one of the upper die inserts is brought into contact with the mating portion of one of the lower die inserts (11), the punch (6) is actuated to complete the punching of the first hole, and the waste material removal mechanism is used to remove the punching waste material; The second punching step: the upper die (21) continues to move toward the lower die (22), the mating portion of the other upper die insert contacts and fits with the mating portion of the other lower die insert (11), the punch (6) moves to complete the punching of the second hole, and the waste material removal mechanism is used to remove the punching waste, thereby completing the punching of both sides of the product.

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