Paper shredder blade stamping die

Abstract

The present invention discloses a stamping die for shredder blades, which includes a lower stamping die, an upper stamping die, a fixture turntable and a turntable driving mechanism. The fixture turntable is rotatably installed on the lower stamping die. The lower stamping die is provided with a pre-punching station, a material separation station, a fine-punching station and a blanking station. The pre-punching station and the material separation station are arranged in a straight line, and the material separation station, the fine-punching station and the blanking station are arranged around the rotation axis of the fixture turntable. The pre-punching station processes the metal strip into blade semi-finished products, and the fine-punching station processes the blade semi-finished products into blades. A plurality of clamping areas for accommodating the blade semi-finished products are evenly arranged on the fixture turntable around the rotation axis. The material separation station cuts the blade semi-finished products from the module and presses them into the clamping areas. The fixture turntable sequentially transports the blade semi-finished products to the material separation station, the fine-punching station and the blanking station. In the present invention, the pre-punching station for processing the metal strip is set in a straight line, and the fine-punching station for processing single blades is set in a circular shape, effectively saving the die volume, saving energy and being easy to position.

Description

Technical Field

[0001] The present invention relates to a stamping die for shredder blades, which is used for further processing on a semi-finished blade with a tip shape. Background Art

[0002] Traditional shredder blades include a sheet-shaped blade body, a mounting hole provided on the blade body, and a tip protruding from the outer edge of the blade body. The periphery of the blade body is a right angle, so that the periphery of the shredder blade forms a right-angle cutting edge. However, when shredding paper with such a shredder blade, the cutting edge is not sharp. To solve this problem, technicians have developed a V-shaped blade. Referring to Patent CN202666951U, the cutting edge of the periphery of this shredder blade is an oblique angle, making the cutting edge of the shredder blade sharp. However, on the one hand, during stamping processing, the blank must be larger than the blade body of the shredder blade to leave enough stamping positions, and during stamping, the waste generated after forming the oblique angle needs to be punched off; on the other hand, when using such a shredder blade, since the cutting surfaces of the cutting edges on the periphery of the blade are distributed over the entire thickness of the shredder blade, the middle part of the cutting edge is relatively thick. After the end of the cutting edge is worn, the shredder blade will quickly become dull and have a short service life.

[0003] To change this situation, a new type of shredder blade has been developed. Through the semi-shearing forming process in the stamping forming process, the material at the edge of the blade blank is extruded downward so that the material at the edge expands outward to form a cutting thin sheet. It not only saves materials and cuts paper sharply, but also after wear, a sharp cutting surface can still be formed at the end of the cutting thin sheet, and it has a long service life. However, the processing of such shredder blades has complex processes, low production efficiency, and additionally increases the processing cost of the shredder blades.

[0004] Therefore, there is an urgent need for a shredder blade processing device with high production efficiency and low processing cost. Summary of the Invention

[0005] The object of the present invention is to provide a stamping die for shredder blades with high production efficiency and low processing cost.

[0006] In order to achieve the above object, the present invention discloses a stamping die for shredder blades, which includes a lower stamping die, an upper stamping die, a fixture turntable and a turntable driving mechanism. A pre-punching station, a blanking station, a fine-punching station and a blanking station are arranged on the lower stamping die. The pre-punching station and the blanking station are arranged in sequence along a straight line. The fixture turntable is rotatably installed on the lower stamping die around a rotation axis. The blanking station, the fine-punching station and the blanking station are arranged in sequence around the rotation axis. Punches corresponding to the pre-punching station, the blanking station and the fine-punching station are arranged on the upper stamping die. Multiple pre-punching stations process a metal strip into blade semi-finished products. A number of clamping areas capable of accommodating and positioning the blade semi-finished products are evenly arranged on the fixture turntable around the rotation axis. The blanking station cuts the blade semi-finished products from the metal strip and presses them into the clamping areas. The turntable driving mechanism is connected to the fixture turntable and controls the fixture turntable to sequentially convey the blade semi-finished products in the clamping areas to the blanking station, the fine-punching station and the blanking station. The fine-punching station processes the blade semi-finished products into blades, and the blanking station discharges the blades.

[0007] Compared with the prior art, the present invention arranges the pre-punching station for processing the metal strip in a straight line and arranges the fine-punching station for processing single blades in a circular shape, effectively saving the volume of the production line. Moreover, the present invention uses a turntable with clamping areas having multiple stations as a fixture for shredder blades, so that one fixture turntable can carry multiple shredder blades (blade semi-finished products) at the same time. It can not only process multiple shredder blades simultaneously, but also has high production efficiency. It can directly move the products to be processed to the next station by rotation, saving energy and being easy to position.

[0008] Preferably, multiple blade tips are provided on the blade semi-finished products, and at least two clamping grooves that cooperate with the blade tips on the blade semi-finished products and clamp the blade tips are arranged on each clamping area. The clamping area positions the blade semi-finished products through the clamping grooves. Compared with the prior art, the present invention clamps the blade semi-finished products through clamping grooves that match the shape of the blade tips, so that the blade semi-finished products can be directly driven by the fixture turntable to move on the lower stamping die, and at the same time, stamping processing can be carried out on the edges or the blade bodies of the blade semi-finished products during the movement. There is no need for loading and unloading during each stamping. The operation is simple, and using the clamping grooves to clamp multiple blade tips also plays a role in positioning the blades, preventing the displacement and misalignment of the blades driven by the fixture turntable to drive the blades to move.

[0009] Preferably, a blanking groove for the blades clamped on the clamping area to fall into is formed at the blanking station of the lower stamping die.

[0010] Specifically, the stamping die for shredder blades further includes a blanking channel communicated with the blanking groove, and the blanking channel outputs the blades in the blanking groove.

[0011] Specifically, the embryo shape of the blade body is formed on the semi-finished blade. The fine blanking station includes a blanking edge station and a trimming station arranged in sequence. The punch includes a blanking edge punch corresponding to the blanking edge station and a trimming punch corresponding to the trimming station. The blanking edge punch extrudes the edge material of the semi-finished blade to form a cutting thin sheet surrounding the blade body. The trimming station punches the edge of the cutting thin sheet to form a blade edge at the outermost edge of the cutting thin sheet to make a blade.

[0012] More specifically, at least two guiding holes are provided on the blade body of the semi-finished blade. Alignment pins and alignment holes that are correspondingly concave-convex and cooperate with the guiding holes are respectively provided on the upper stamping die and the lower stamping die of the blanking edge station. When the upper stamping die presses down, it can drive the alignment pins to pass through the guiding holes and then extend into the alignment holes, ensuring that the blanking edge punch accurately presses on the semi-finished blade during blanking edge, and preventing inaccurate blanking edge caused by the displacement of the semi-finished blade. Among them, the top end of the alignment pin is arc-shaped or conical, which is convenient for guiding into the alignment hole and the guiding hole. The guiding hole can be a progressive hole with a large opening at the top and a small bottom, which is convenient for the alignment pin to enter and accurately guide.

[0013] More specifically, the fine blanking station further includes a leveling station located between the trimming station and the blanking station. The punch includes a leveling punch corresponding to the leveling station. The leveling punch cooperates with the lower stamping die to level the blade.

[0014] Preferably, the shredder blade stamping die further includes a stripper plate. The stripper plate is fixedly installed on the lower stamping die and is located above the fixture turntable to block the clamping grooves at the fine blanking station. A plurality of clearance holes for the punches at the blanking and fine blanking stations to pass through are provided on the stripper plate, and an opening for the semi-finished blade to extend into the clearance hole is provided at the blanking station on the stripper plate.

[0015] Preferably, the turntable driving mechanism includes a one-way transmission component. One end of the one-way transmission component is connected to the upper stamping die, and the other end is connected to the fixture turntable. When the upper stamping die performs a reset action, it drives the fixture turntable to rotate in the positive direction by a processing angle. The angle of the processing angle is equal to the central angle between two clamping areas. This solution enables the present invention to automatically drive the station rotation of the fixture turntable through the stamping action of the stamping die, saving energy and ensuring the timing sequence of the stamping die action and the fixture turntable rotation. Among them, the action of the upper stamping die is controlled by a corresponding drive source in the stamping device, which will not be elaborated here.

[0016] Specifically, the one-way transmission assembly includes a driving plate connected to the upper stamping die, a first push block rotatably mounted on the driving plate, a first rotating shaft rotatably mounted on the lower stamping die, a one-way gear mounted on the first rotating shaft, and a transmission part mounted between the first rotating shaft and the fixture turntable. When the upper stamping die resets, it drives the driving plate to move forward. The driving plate drives the first push block to push forward to abut against the one-way gear, thereby driving the one-way gear to rotate in the positive direction. The one-way gear drives the fixture turntable to rotate in the positive direction by an angle for processing through the transmission part.

[0017] More specifically, the one-way transmission assembly further includes a second push block and an elastic member. The second push block is rotatably mounted on the lower stamping die and is opposite to the one-way gear in position. The elastic member is mounted between the second push block and the lower stamping die and provides an elastic force for the second push block to abut against the one-way gear to prevent the one-way gear from rotating in the reverse direction. Description of the Drawings

[0018] Figure 1 is a three-dimensional structural schematic diagram of the shredder blade stamping die of the present invention.

[0019] Figure 2 is a side view of the shredder blade stamping die of the present invention.

[0020] Figure 3 is a sectional view of the shredder blade stamping die of the present invention.

[0021] Figure 4 is a structural schematic diagram of the shredder blade stamping die of the present invention after removing the upper stamping die.

[0022] Figure 5 is Figure 4 is a top view.

[0023] Figure 6 is Figure 4 exploded schematic diagram of

[0024] Figure 7 is Figure 4 structural schematic diagram after removing the stripping plate.

[0025] Figure 8 is a structural schematic diagram of the fixture turntable of the present invention.

[0026] Figure 9 is a schematic diagram of the material distributing punch and the fine punching punch on the upper stamping die of the present invention.

[0027] Figure 10 is a schematic diagram of the pre-processing procedure of the present invention.

[0028] Figure 11aIt is a schematic diagram of the cooperation between the fixture turntable, the blanking punch, and the fine punching punch of the present invention.

[0029] Figure 11b It is a schematic diagram of the working state of the fixture turntable of the present invention.

[0030] Figure 11c It is a schematic diagram of the processing procedure when machining the edge of the blade of the present invention.

[0031] Figure 12 It is a schematic structural diagram of the edge pressing punch of the present invention.

[0032] Figures 13a to 13d It is a product diagram of the blade processed after each processing procedure when machining the edge of the blade of the present invention.

[0033] Figure 14a It is a schematic structural diagram of the blade semi-finished product before processing.

[0034] Figure 14b It is a schematic structural diagram of the blade after processing is completed. Specific Embodiments

[0035] To describe in detail the technical content, structural features, achieved objectives, and effects of the present invention, the following will be described in detail in conjunction with the embodiments and with reference to the accompanying drawings.

[0036] Reference Figures 1 to 7 , the present invention discloses a shredder blade stamping die 100, including a lower stamping die 10, an upper stamping die 20, a fixture turntable 30, and a turntable driving mechanism. The fixture turntable 30 is rotatably installed on the lower stamping die 10 and is used to load the blade semi-finished product 300 (such as Figure 9 described). Reference Figure 7 , a pre-punching station 50, a blanking station 41, a fine punching station 42, and a blanking station 43 are provided on the lower stamping die 10. The pre-punching station 50 and the blanking station 41 are arranged in sequence along a straight line. The fixture turntable 30 is rotatably installed on the lower stamping die 20 around a rotation axis 31. The blanking station 41, the fine punching station 42, and the blanking station 43 are arranged in sequence around the rotation axis 31. Punches corresponding to the pre-punching station 50, the blanking station 41, and the fine punching station 42 are provided on the upper stamping die 10. Reference Figure 10, multiple pre-punching stations 50 process the metal strip 200 into semi-finished blade 300. A number of clamping areas 32 that can accommodate and position the semi-finished blade 300 are evenly arranged around the rotating shaft 31 on the fixture turntable 30. The material distribution station 41 cuts the semi-finished blade 300 from the metal strip 200 and presses it into the clamping area 32. The turntable driving mechanism is connected to the fixture turntable 30 and controls the fixture turntable 30 to stepwise rotate around the rotating shaft 31, so that the fixture turntable 30 sequentially transports the semi-finished blade 300 in the clamping area 32 from the material distribution station 41 to the fine punching station 42 and the blanking station 43. Refer to Figure 11c , the fine punching station 42 processes the semi-finished blade 300 into a blade 400, and the blanking station 43 blanks the blade 400.

[0037] Refer to Figure 10 , on one side of the lower stamping die 10 opposite to the material distribution station 41, a processing table 13 for inputting the metal strip is formed, and the pre-punching station 50 is formed on the workbench 13. Refer to Figure 7 and Figure 10 , a pre-fine punching punch corresponding to the pre-punching station 50 (such as the shaded part in Figure 10 ) is formed on the upper stamping die 20. The pre-fine punching punches are sequentially arranged corresponding to the pre-punching station 50 on the processing table 13 and process the embryo shape of the blade body and the outer shape of the blade tip on the metal strip, thereby making the semi-finished blade 300. The output end of the processing table 13 is opposite to the position of the material distribution station 41, and the metal strip 200 can be transported along the processing table to the material distribution station 41 and is located above the fixture turntable 30. Among them, the pre-punching station 50 includes a center hole punching station 51 for processing the center hole of the shredder blade, punching edge stations 52, 53 for punching the blade tip and the blade body prototype, a punching hole station 54 for punching the center mounting hole of the shredder blade, bevel stations 55, 56 for punching the bevel angle of the blade tip, and a counterpoint hole fine punching station 57 for punching the guide hole 302. Of course, the specific type and sequence of the pre-punching station 50 can be designed according to actual needs and are not limited to the above structure.

[0038] Among them, refer to Figure 11b , the semi-finished blade 300 has multiple blade tips (such as those in Figure 14a ), and the fine punching station 42 is used to process the blade edge. At least two clamping grooves 321 that cooperate with the blade tips 201 on the semi-finished blade 300 and clamp the blade tips 201 are provided on each clamping area 32. Among them, the size of the clamping groove 321 is slightly larger than the size of the blade tip 201, which is convenient for the semi-finished blade 300 to fall into the clamping area 32 under the action of gravity. Of course, the upper opening of the clamping groove 321 can also be set in a flared shape, that is, large at the opening and small at the bottom, which is convenient for the semi-finished blade 300 to enter. The clamping area 32 is a through slot.

[0039] In this embodiment, there are eight clamping areas 32 on a fixture turntable 30. This embodiment includes a material distribution station 41, a blanking station 43, and multiple fine blanking stations 42. The adjacent two clamping areas 32 are 45 degrees apart, and the central angle between two stations is 45 degrees in some parts and 90 degrees in some parts. Of course, multiple material distribution stations and blanking stations can also be formed on a fixture turntable 30. For example, two material distribution stations and two blanking stations are set. One material distribution station 41, the corresponding one or more fine blanking stations 42, and one blanking station 43 form a group, that is, there are corresponding fine blanking stations between each material distribution station and the corresponding blanking station, so that two production lines can be realized through one fixture turntable 30. Of course, the number of clamping areas 32 on each fixture turntable 40 can also be other numbers, such as 10, 12, etc., which can be set according to actual needs.

[0040] Reference Figure 8 , the fixture turntable 30 is in a sheet shape, which includes a central part 33 installed on a rotating shaft 31 and several clamping arms 34 extending outward from the central part 33. The clamping area 32 is formed between two adjacent clamping arms 34. Specifically, a clamping groove 321 is formed on the outer side of the front end and the inner side of the end of each clamping arm 34. The clamping area 32 is formed between two adjacent clamping grooves 321. The clamping groove 321 on the outer side of the front end of each clamping arm 34 is opposite to the clamping groove 321 on the inner side of the end of the other adjacent clamping arm 34 on the outside. In this embodiment, the clamping area 32 is an open notch, which not only saves materials and is convenient for production, but also facilitates the taking and placing of processed products.

[0041] Reference Figure 7 and Figure 8 , a blanking groove 11 for the blade clamped on the clamping area to fall into is opened at the blanking station 43 of the lower stamping die 10. A material distribution punch 22 corresponding to the material distribution station 41 is also provided on the upper stamping die 20. The material distribution punch 22 separates the blade semi-finished product 300 at the material distribution station 41 from the blade semi-finished product module and punches the blade semi-finished product 300 into the clamping area 32 at the material distribution station 41. The blade 400 falls into the blanking groove 11 under the action of gravity at the blanking station 43. Among them, the shredder blade stamping die 100 further includes a blanking channel 12 communicated with the blanking groove 11, and the blanking channel 12 outputs the blade 400 in the blanking groove 11. Of course, the blade blanking can also be carried out by means of a manipulator, a suction cup, etc.

[0042] Reference Figure 14a , an embryo shape of the blade body is formed on the blade semi-finished product 300. Reference Figure 7 and Figure 11a, the fine blanking station 42 includes a blank holding station 421, 422 and a trimming station 423 arranged in sequence. The punch includes a fine blanking punch corresponding to the fine blanking station 42. The fine blanking punch 21 includes blank holding punches 211, 212 corresponding to the blank holding stations 421, 422, and a trimming punch 23 corresponding to the trimming station 423. Refer to Figure 11a and Figure 11b , the blank holding punches 421, 422 extrude the edge material of the blade semi-finished product 300 to form a cutting thin sheet 301 surrounding the blade body (as Figure 13c shown), and the trimming punch 23 punches the edge of the cutting thin sheet 301 to form a blade edge at the outermost edge of the cutting thin sheet 301 to make a blade 400 (as Figure 13d shown).

[0043] Among them, the blank holding punch 211 is as Figure 12 shown, and its end is wedge-shaped, which is used to punch a pre-charging line 304 on the blade semi-finished product 300. At this time, the blade semi-finished product 300 is as Figure 13b shown. The end of the blank holding punch 212 is a plane, which is used to extrude the edge material of the blade semi-finished product 300 outside the pre-charging line 304 to form a cutting thin sheet 301 surrounding the blade body (as Figure 13c shown).

[0044] Among them, there are at least two guiding holes 302 on the blade body 301 of the blade semi-finished product 300. At the positions corresponding to the blank holding stations 421, 422 on the upper stamping die 20 and the lower stamping die 10, there are alignment pins (not shown in the figure) and alignment holes 303 corresponding to and in concave-convex fit with the guiding holes 302 respectively. When the upper stamping die 20 presses down, it can drive the alignment pins to pass through the guiding holes 302 and extend into the alignment holes 303. The aperture of the guiding hole 302 is slightly larger than the aperture of the alignment hole 303. In this embodiment, the diameter of the guiding hole 302 is five wires larger than the diameter of the alignment hole 303.

[0045] Refer to Figure 7 , Figure 11a and Figure 11b , the fine blanking station 42 further includes a leveling station 424 located between the trimming station 423 and the blanking station 43. Refer to Figure 9 , the fine blanking punch 21 includes a leveling punch 24 corresponding to the leveling station 424. The leveling punch 23 cooperates with the lower stamping die 10 to level the blade 400.

[0046] Refer to Figures 4 to 6, the shredder blade stamping die 100 further includes a stripper plate 60, which is fixedly installed on the lower stamping die 10 and located above the fixture turntable 30 to block the clamping groove 321 at the fine stamping station 42. A plurality of clearance holes 61-65 for the fine stamping punches 21 and the blanking punches 22 to pass through are provided on the stripper plate 60 corresponding to the blanking station 41 and the fine stamping station 42. An opening 611 for the blade semi-finished product 300 to extend into the clearance hole 61 is provided on the stripper plate 60 at the blanking station 41, and the clamping groove 321 is exposed outside at the clearance groove 61. Among them, flanges 621 for blocking the clamping groove 321 are provided at positions corresponding to the clamping groove 321 on the edges of the clearance grooves 62-65.

[0047] Reference Figures 1 to 3 , the turntable driving mechanism includes a one-way transmission assembly 70. One end of the one-way transmission assembly 70 is connected to the upper stamping die 20, and the other end is connected to the fixture turntable 30. When the upper stamping die 20 moves upward for resetting, the fixture turntable 30 is driven to rotate in the positive direction by a processing angle. The angle of the processing angle is equal to the central angle between the two clamping areas 32. In this embodiment, the processing angle is 45 degrees. Of course, the turntable driving mechanism can also be a stepping driving source, which drives the fixture turntable 30 to move. It only needs to move the fixture turntable 30 by a processing angle before the upper stamping die 20 presses downward.

[0048] Among them, the metal strip 200 also needs to move a step position before the upper stamping die 20 presses downward. The metal strip 200 can move synchronously with the fixture turntable 30. Therefore, a one-way transmission mechanism can be used to connect the upper stamping die 20 and the conveying mechanism of the metal strip 200 to drive the metal strip 200 to move synchronously with the fixture turntable 30.

[0049] Specifically, reference Figures 1 to 3 , the one-way transmission assembly 70 includes a driving plate 71 connected to the upper stamping die 20, a first push block 72 rotatably installed on the driving plate 71, a first rotating shaft 73 rotatably installed on the lower stamping die 10, a one-way gear 74 installed on the first rotating shaft 73, and a transmission part 75 installed between the first rotating shaft 74 and the fixture turntable 30. When the upper stamping die 20 resets and drives the driving plate 71 to move forward, the driving plate 71 drives the first push block 72 to push forward to push against the one-way gear 74, thereby driving the one-way gear 74 to rotate in the positive direction. The one-way gear 74 drives the fixture turntable 30 to rotate in the positive direction by a processing angle through the transmission part 75. Among them, the upper stamping die 20 moves up and down under the control of a driving source.

[0050] Among them, the one-way transmission assembly 70 further includes a second push block 76 and an elastic member (not shown in the figure). The second push block 43 is rotatably installed on the lower stamping die 10 and is opposite to the one-way gear 74 in position. The elastic member is installed between the second push block 76 and the lower stamping die 10 and provides an elastic force against the one-way gear 74 to prevent the one-way gear 74 from rotating in the reverse direction.

[0051] Reference Figure 2 , the driving plate 71 includes a pulling plate 77 connected to the upper stamping die 20 and a sliding plate 78 slidably installed on the lower stamping die 10 in the horizontal direction. Oblique holes 771 inclined relative to the vertical direction are respectively formed in the pulling plate 77 and the sliding plate 78, and sliding blocks 781 slidably installed in the oblique holes 771. The lifting movement of the upper stamping die 20 drives the sliding block 78 to slide in the horizontal direction, and the sliding block 78 drives the first push block 72 to move in the horizontal direction.

[0052] Among them, in this embodiment, a telescopic cylinder or a stepping motor is used as a stamping device to drive the upper stamping die 20 to lift for stamping the blade and resetting.

[0053] Reference Figures 6 to 14b , a method for processing shredder blades by the shredder blade stamping die 100 of the present invention is described:

[0054] (1) Reference Figure 6 and Figure 10 , an external conveying mechanism steps the metal strip 200 into the processing table 13 according to the timing of the downward punching of the upper stamping die 20. The pre-punching punch processes the blank shape of the blade body and the tip shape on the metal strip to form a blade semi-finished product 300. At this time, the processed semi-finished product 300 is as Figure 13a and Figure 14a shown. The stations 51 - 57 are arranged in a straight line and the material distribution station 41 is located after the station 57. The processed semi-finished product 300 will be sent to the material distribution station 41 and located above the fixture turntable 30 along with the conveyance of the metal strip 200.

[0055] (2) At this time, the driving mechanism drives the upper stamping die 20 to descend for stamping. Refer to Figure 10 , 11a to Figure 11c shown at the material distribution station 41 in the middle. The material distribution punch 22 punches the blade semi-finished product 300 at the material distribution station to cut it from the blade semi-finished product module and punch the cut blade semi-finished product 300 into the clamping area 32 at the material distribution station 41.

[0056] (3) The driving mechanism drives the upper stamping die 20 to rise and reset. The upper stamping die 20 drives the fixture turntable 30 to rotate in the positive direction by a processing angle (45 degrees) through the one-way transmission assembly 70, and the blade semi-finished product 300 for dividing and blanking is moved to the edge pressing station 421. The conveying mechanism drives the metal strip 200 to advance one step, and the next blade semi-finished product 300 is sent to the material dividing station 41.

[0057] (4) The driving mechanism drives the upper stamping die 20 to descend for stamping. Refer to Figures 11a to 11c At the edge pressing station 421, the edge pressing punch 211 punches a pre-charging line 304 on the upper part of the blade semi-finished product 300. As Figure 13b shown, at this time, the edge material outside the pre-charging line 304 is slightly extruded by the edge pressing punch 211 to move outward.

[0058] (5) The driving mechanism drives the upper stamping die 20 to rise and reset. The upper stamping die 20 drives the fixture turntable 30 to rotate in the positive direction by a processing angle (45 degrees) through the one-way transmission assembly 70. The blade semi-finished product 300 with the pre-charging line 304 pressed is moved to an empty station. The conveying mechanism drives the metal strip 200 to advance one step, and the third blade semi-finished product 300 is sent to the material dividing station 41. Until the upper stamping die 20 completes another descending and rising action again, the blade semi-finished product 300 with the pre-charging line 304 pressed is sent to the edge pressing station 422. At this time, the conveying mechanism drives the metal strip 200 to advance one more step, and the fourth blade semi-finished product 300 is sent to the material dividing station 41.

[0059] (6) The driving mechanism drives the upper stamping die 20 to descend for stamping. Refer to Figures 11a to 11c At the edge pressing station 422, the edge pressing punch 212 extrudes the edge material outside the pre-charging line 304 of the blade semi-finished product 300 to form a cutting thin sheet 301 surrounding the blade body (as Figure 13c shown).

[0060] (7) The driving mechanism drives the upper stamping die 20 to rise and reset. The upper stamping die 20 drives the fixture turntable 30 to rotate in the positive direction by a processing angle (45 degrees) through the one-way transmission assembly 70. The blade semi-finished product 300 with the cutting thin sheet 301 pressed is moved to the trimming station 423. The conveying mechanism drives the metal strip 200 to advance one more step, and the fifth blade semi-finished product 300 is sent to the material dividing station 41.

[0061] (8) The driving mechanism drives the upper stamping die 20 to descend for stamping. Refer to Figures 11a to 11c At the trimming station 423, the trimming punch 23 punches the edge of the cutting thin sheet 301 to form a blade edge at the outermost edge of the cutting thin sheet 301 to make a blade 400 (as Figure 13d shown).

[0062] (9) The driving mechanism drives the upper stamping die 20 to rise and reset. The upper stamping die 20 drives the fixture turntable 30 to rotate a processing angle (45 degrees) in the positive direction through the one-way transmission assembly 70. The blade 400 for making the blade edge is moved to the leveling station 424. The conveying mechanism drives the metal strip 200 to advance one more step, and the sixth blade semi-finished product 300 is sent to the material distribution station 41.

[0063] (10) The driving mechanism drives the upper stamping die 20 to descend for stamping. Refer to Figures 11a to 11c At the leveling station 424 in [[reference]], the leveling punch 23 cooperates with the lower stamping die 10 to level the blade 400.

[0064] (11) The driving mechanism drives the upper stamping die 20 to rise and reset. The upper stamping die 20 drives the fixture turntable 30 to rotate a processing angle (45 degrees) in the positive direction through the one-way transmission assembly 70. The blade 400 for making the blade edge is moved to the blanking station 43. The blade 400 falls into the blanking chute 11 under the action of gravity at the blanking station 43 and is output along the blanking channel 12. The conveying mechanism drives the metal strip 200 to advance one more step, and the seventh blade semi-finished product 300 is sent to the material distribution station 41.

[0065] Among them, refer to Figure 11c , seven products can be processed simultaneously at the stations on the above-mentioned fixture turntable 30. The pre-punch, the material distribution punch 22, and the fine punch 21 all rise and fall simultaneously under the drive of the upper stamping die 20.

[0066] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A punching die for shredder blades, characterized in that, it includes a lower punching die, an upper punching die, a fixture turntable and a turntable driving mechanism. A pre-punching station, a blanking station, a fine-punching station and a blanking station are arranged on the lower punching die. The pre-punching station and the blanking station are arranged in sequence along a straight line. The fixture turntable is rotatably installed on the lower punching die around a rotating shaft. The blanking station, the fine-punching station and the blanking station are arranged in sequence around the rotating shaft. Punches corresponding to the pre-punching station, the blanking station and the fine-punching station are arranged on the upper punching die. Multiple pre-punching stations process a metal strip into blade semi-finished products. A number of clamping areas capable of accommodating and positioning the blade semi-finished products are evenly arranged on the fixture turntable around the rotating shaft. The blanking station cuts the blade semi-finished products from the metal strip and presses them into the clamping areas. And the turntable driving mechanism is connected to the fixture turntable and controls the fixture turntable to sequentially convey the blade semi-finished products in the clamping areas to the blanking station, the fine-punching station and the blanking station. The fine-punching station processes the blade semi-finished products into blades, and the blanking station discharges the blades; wherein, the fine-punching station includes a blanking-edge station and a trimming station arranged in sequence. The punches include a blanking-edge punch corresponding to the blanking-edge station and a trimming punch corresponding to the trimming station. The blanking-edge punch extrudes the edge material of the blade semi-finished product to form a cutting thin sheet surrounding the blade body. The trimming station punches the edge of the cutting thin sheet to form a blade edge at the outermost edge of the cutting thin sheet to make a blade.

2. The punching die for shredder blades according to claim 1, characterized in that, the blade semi-finished product has a plurality of blade tips. At least two clamping grooves that cooperate with the blade tips on the blade semi-finished product and clamp the blade tips are arranged on each clamping area. The clamping area positions the blade semi-finished product through the clamping grooves.

3. The punching die for shredder blades according to claim 1, characterized in that, the lower punching die is provided with a blanking groove at the blanking station for the blade clamped on the clamping area to fall into.

4. The punching die for shredder blades according to claim 1, characterized in that, at least two guiding holes are provided on the blade body of the blade semi-finished product. Alignment pins and alignment holes that correspond to the guiding holes and are in concave-convex fit are respectively arranged on the upper punching die and the lower punching die of the blanking-edge station. When the upper punching die presses down, it can drive the alignment pins to pass through the guiding holes and extend into the alignment holes.

5. The punching die for shredder blades according to claim 1, characterized in that, the fine-punching station further includes a leveling station located between the trimming station and the blanking station. The punch includes a leveling punch corresponding to the leveling station. The leveling punch cooperates with the lower punching die to level the blade.

6. The punching die for shredder blades according to claim 1, characterized in that, It further includes a stripper plate which is fixedly installed on the lower stamping die and located above the fixture turntable to block the clamping grooves at the fine blanking stations. A plurality of clearance holes corresponding to the blanking station and the fine blanking stations are formed in the stripper plate for the punches at the blanking station and the fine blanking stations to pass through. An opening for the blade semi-finished products to extend into the clearance hole is formed in the stripper plate at the blanking station.

7. The shredder blade stamping die according to claim 1, characterized in that the turntable driving mechanism includes a one-way transmission assembly. One end of the one-way transmission assembly is connected to the upper stamping die, and the other end is connected to the fixture turntable. When the upper stamping die performs a reset action, the fixture turntable is driven to rotate in the positive direction by a processing angle, and the angle of the processing angle is equal to the central angle between the two clamping areas.

8. The shredder blade stamping die according to claim 7, characterized in that the one-way transmission assembly includes a driving plate connected to the upper stamping die, a first push block rotatably installed on the driving plate, a first rotating shaft rotatably installed on the lower stamping die, a one-way gear installed on the first rotating shaft, and a transmission part installed between the first rotating shaft and the fixture turntable. When the upper stamping die resets, the driving plate is driven to move forward. The driving plate drives the first push block to push forward to push against the one-way gear, thereby driving the one-way gear to rotate in the positive direction. The one-way gear drives the fixture turntable to rotate in the positive direction by a processing angle through the transmission part.

9. The shredder blade stamping die according to claim 8, characterized in that the one-way transmission assembly further includes a second push block and an elastic member. The second push block is rotatably installed on the lower stamping die and is opposite to the one-way gear in position. The elastic member is installed between the second push block and the lower stamping die and provides an elastic force for the second push block to resist against the one-way gear to prevent the one-way gear from rotating in the reverse direction.

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