A rotary cutting knife and a rotary cutting die

Abstract

The present application relates to the technical field of stretch part port trimming, and more particularly to a rotary cutting cutter and rotary cutting die, the rotary cutting cutter comprising an upper cutter, a positioning ring, a lower cutter, a movable block and a guide rail seat, the lower cutter being fixed to the top of the movable block, the lower cutter being provided with a positioning cavity, the upper cutter being provided with a first magnet, the positioning ring being provided with a second magnet, the upper cutter and the positioning ring being connected by the adsorption of the first magnet and the second magnet, the positioning ring being embedded in the positioning cavity, the inner wall of the guide rail seat being provided with a guide rail, the movable block being matched with the guide rail, and the movable block moving in the horizontal direction along the guide rail while ascending and descending along the guide rail seat. The movement of the lower cutter is realized by the cooperation of the movable block and the guide rail in the inner wall of the guide rail seat, thereby reducing energy consumption. Due to the adsorption of the first magnet and the second magnet, the small cutter is reinforced, the stretch part is separated from the positioning ring after the rotary cutting die is opened, and the operation continuity is not affected, so the rotary cutting die is suitable for the continuous trimming of slender and narrow stretch parts.

Description

Technical Field

[0001] This invention relates to the technical field of end trimming of drawn parts, and more specifically, to a rotary cutting cutter and a rotary cutting die. Background Technology

[0002] Sheet metal products are used in various fields of life, playing a dominant role in industries such as fire-fighting accessories, photovoltaic accessories, electronic components, and automotive parts. Among these, drawn metal products (including round, square, oval, and irregular shapes) are quite common. During the multi-step drawing process, due to material anisotropy, uneven thickness, inaccurate positioning, or uneven die clearance, the ends of the drawn products are often uneven. Therefore, for parts requiring flush, aesthetically pleasing, and dimensionally accurate ends, an additional trimming process is necessary. There are several methods for trimming the ends of drawn parts: 1. Multiple side trimmings using a simple die; 2. Using an extrusion die to remove burrs; 3. Trimming on a lathe or spinning machine; 4. Laser cutting. These trimming processes often fail to produce uniform and stable product dimensions, and may even result in large burrs, uneven edges, end deformation, rapid tool wear, and low trimming efficiency.

[0003] Horizontal rotary cutting is superior to the aforementioned trimming processes due to its higher trimming accuracy and efficiency, making it widely used in the mold industry. However, its main disadvantages are the complex mold structure and rapid blade wear; when trimming slender and narrow drawn parts, it is difficult to install connecting screws, and conventional horizontal rotary cutting mold structures cannot be used normally.

[0004] Existing technology discloses a die-cutting structure, including a worktable and an extruder. The extruder is bolted to the top outer wall of the worktable. A base is bolted to one side of the top outer wall of the worktable, and a groove is formed on the top outer wall of the base. An axial bearing is bolted to the bottom inner wall of the groove, and a shaft disc seat is bolted to the top of the axial bearing. A cutting assembly is bolted to the top outer wall of the shaft disc seat. The cutting assembly includes a base plate, and a fixing seat is welded to the top outer wall of the base plate. In this solution, the cutting blade is rotated by a motor to cut the motor housing, which consumes a lot of energy and has high production costs. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a rotary cutting blade and a rotary cutting die.

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

[0007] A rotary cutting blade is provided, comprising an upper cutting blade, a positioning ring, a lower cutting blade, a movable block, and a guide rail base. The lower cutting blade is fixed to the top of the movable block and has a positioning cavity. The upper cutting blade is equipped with a first magnet, and the positioning ring is equipped with a second magnet. The upper cutting blade and the positioning ring can be attracted and connected by the attraction of the first magnet and the second magnet. The positioning ring can be embedded in the positioning cavity. The inner wall of the guide rail base is provided with a guide rail. The movable block cooperates with the guide rail. The movable block can move horizontally along the guide rail while rising and falling along the guide rail base.

[0008] In this invention, the rotary cutting blade has a positioning ring suspended at the bottom of the upper cutting blade by the attraction of a first magnet and a second magnet, thus reinforcing the small cutting blade. During use, the stretched part is placed in the positioning cavity of the lower cutting blade, and the upper cutting blade is pressed down, causing the positioning ring to embed into the inner cavity of the stretched part. After the positioning ring is in place in the lower cutting blade, the upper cutting blade continues to press down, pressing down the movable block. Simultaneously, the edge of the movable block engages with the guide rail on the inner wall of the guide rail seat, causing the movable block to move horizontally. This, in turn, causes the lower cutting blade and its internal positioning ring to move horizontally, ensuring the smooth operation of the stretched part. Simultaneously positioning and rotary cutting of the drawn parts, this invention is suitable for rotary cutting of various drawn parts, including continuous cutting of slender and narrow drawn parts. Due to the attraction between the first and second magnets, the drawn parts and positioning rings separate normally after the rotary cutting mold is opened, without affecting the continuity of the operation. Furthermore, the attraction between the first and second magnets allows the positioning ring to return to its initial position, facilitating the positioning of the drawn parts by the positioning ring in the next use and avoiding defects such as inaccurate positioning and uneven cut surfaces. This invention achieves the action of the lower cutter through the cooperation between the movable block and the inner wall guide rail of the guide rail seat, reducing energy consumption.

[0009] Furthermore, the guide rail base includes four guide rail blocks, which are distributed around the movable block. The guide rails are respectively disposed on the inner wall of the guide rail blocks, and the guide rails of two opposite guide rail blocks cooperate to clamp the movable block.

[0010] Furthermore, it also includes a limiting post, which is fixedly connected to the upper cutter, and the bottom of the limiting post protrudes from the bottom surface of the upper cutter, and the bottom surface of the limiting post can abut against the top surface of the lower cutter.

[0011] Furthermore, the cutting edge of the upper cutter is a concave arc.

[0012] Furthermore, both sides of the upper cutter and both sides of the positioning ring are provided with rounded corners.

[0013] The present invention also provides a rotary cutting mold, including an upper mold and a lower mold, wherein the upper mold can move up and down along the lower mold, and further includes the aforementioned rotary cutting blade, wherein the top of the upper cutting blade is fixed to the upper mold, and the guide rail seat is mounted on the top of the lower mold.

[0014] The rotary cutting die of this invention has an upper cutter fixed to the upper die and a guide rail seat installed on the lower die. When the upper die descends, the positioning ring gradually enters the inner cavity of the drawn part. As the upper die continues to descend, it presses down the movable block. The guide rail on the inner wall of the guide rail seat cooperates with the movable block, causing the movable block to move horizontally. This, in turn, causes the lower cutter and its internal positioning ring to move horizontally. During this descent, the lower and upper cutters perform a horizontal tearing action on the drawn part, achieving rotary cutting and reducing energy consumption. Due to the attraction of the first and second magnets, after the rotary cutting die is opened, the positioning ring hangs at the bottom of the upper cutter. The drawn part and the positioning ring separate normally, without affecting the continuity of operation. It is suitable for rotary cutting of various drawn parts, including continuous cutting of slender and narrow drawn parts. Furthermore, the attraction of the first and second magnets allows the positioning ring to return to its initial position, facilitating the positioning of the drawn part by the positioning ring during the next use.

[0015] Furthermore, the upper mold includes an upper mold base, an upper pad, and an upper fixing plate. The upper pad is connected between the upper mold base and the upper fixing plate, and the top of the upper cutter is fixedly connected to the upper fixing plate.

[0016] Furthermore, the lower mold includes a lower mold base, a lower pad, and a lower fixing plate. The lower pad is located between the lower mold base and the lower fixing plate, and the outer wall of the guide rail base is connected to the inner wall of the lower fixing plate.

[0017] Furthermore, it also includes a retraction mechanism for resetting the lower cutter. The retraction mechanism includes a spring box plate, a nitrogen spring, a support block, and a ball-head support rod. The spring box plate is fixedly connected to the bottom of the lower mold base. The nitrogen spring is fixedly installed on the spring box plate. The support block is located on top of the nitrogen spring and slides within the spring box plate. One end of the ball-head support rod is fixed to the top of the support block, and the other end of the ball-head support rod passes through the lower mold base and the lower pad plate in sequence and abuts against the bottom of the movable block.

[0018] Furthermore, it also includes a material ejection mechanism, which includes a screw, a height equalizing sleeve, a spring, a top block, an ejector pin, and a material ejection block. The height equalizing sleeve is fitted around the outer periphery of the screw, and the top of the screw is connected to the movable block. The spring is wound around the outer periphery of the height equalizing sleeve, and both ends of the spring are respectively connected to the bottom of the top block and the bottom of the height equalizing sleeve. The material ejection block is located in the positioning cavity of the lower cutter. One end of the ejector pin is connected to the top block, and the other end of the ejector pin passes through the movable block and abuts against the bottom of the material ejection block.

[0019] Compared with the prior art, the beneficial effects of the rotary cutting blade and rotary cutting die of the present invention are as follows:

[0020] The movement of the lower cutter is achieved by the cooperation between the movable block and the inner wall guide rail of the guide rail seat, which reduces energy consumption. Due to the attraction of the first magnet and the second magnet, the small cutter is reinforced. After the rotary cutting mold is opened, the drawn part and the positioning ring separate normally without affecting the continuity of operation. It is suitable for continuous cutting of long and narrow drawn parts. Moreover, the attraction of the first magnet and the second magnet can restore the positioning ring to the initial position, which is convenient for the positioning ring to position the drawn part in the next use and avoids defects such as inaccurate positioning and uneven cut surface. Attached Figure Description

[0021] Figure 1 This is a diagram showing the usage state of the rotary cutter when the active block is at the upper vertex in an embodiment of the present invention;

[0022] Figure 2 This is a diagram showing the usage state of the rotary cutter when the moving block moves downward and to the right in an embodiment of the present invention.

[0023] Figure 3 This is a diagram showing the usage state of the rotary cutter when the moving block moves downward and to the left in an embodiment of the present invention;

[0024] Figure 4 This is a diagram illustrating the rotary cutting process of the rotary cutting blade in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram showing the connection between the upper cutter and the positioning ring in Embodiment 1 of the present invention;

[0026] Figure 6 This is a schematic diagram of the upper cutting blade in Embodiment 1 of the present invention;

[0027] Figure 7 This is a schematic diagram of the rotary cutting blade in Embodiment 2 of the present invention;

[0028] Figure 8 This is a schematic diagram of the rotary cutting die in an embodiment of the present invention.

[0029] In the attached diagram: 1-Rotary cutting blade; 11-Upper cutting blade; 111-Cutting edge line; 12-Positioning ring; 13-Lower cutting blade; 14-Moving block; 15-Guide rail seat; 151-Guide rail; 16-First magnet; 17-Second magnet; 18-Pin; 19-Limiting post; 2-Upper mold base; 3-Upper pad; 4-Upper fixing plate; 5-Lower mold base; 51-Foot pad; 6-Lower pad; 7-Lower fixing plate; 8-Retraction mechanism; 81-Spring box plate; 82-Nitrogen spring; 83-Support block; 84-Ball head support rod; 9-Unloading mechanism; 91-Screw; 92-Equal height sleeve; 93-Spring; 94-Ejector block; 95-Ejector pin; 96-Unloading block; 10-Stretching part. Detailed Implementation

[0030] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] Example 1

[0033] A rotary cutter, such as Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, it includes an upper cutter 11, a positioning ring 12, a lower cutter 13, a movable block 14, and a guide rail seat 15. The lower cutter 13 is fixed to the top of the movable block 14 and has a positioning cavity. The upper cutter 11 is equipped with a first magnet 16, and the positioning ring 12 is equipped with a second magnet 17. The upper cutter 11 and the positioning ring 12 can be attracted and connected by the attraction of the first magnet 16 and the second magnet 17. The positioning ring 12 can be embedded in the positioning cavity. The inner wall of the guide rail seat 15 is provided with a guide rail 151. The movable block 14 cooperates with the guide rail 151. The movable block 14 can move horizontally along the guide rail 151 while rising and falling along the guide rail seat 15.

[0034] The aforementioned rotary cutting blade has a positioning ring 12 suspended at the bottom of the upper cutting blade 11 by the attraction of the first magnet 16 and the second magnet 17, thus reinforcing the small cutting blade. In use, the stretching member 10 is placed in the positioning cavity of the lower cutting blade 13, and the upper cutting blade 11 is pressed down, causing the positioning ring 12 to embed into the inner cavity of the stretching member 10. After the positioning ring 12 is in place in the lower cutting blade 13, the upper cutting blade 11 continues to press down, pressing down the movable block 14. Simultaneously, the edge of the movable block 14 engages with the guide rail 151 on the inner wall of the guide rail seat 15, causing the movable block 14 to move horizontally. This, in turn, causes the lower cutting blade 13 and its internal positioning ring 12 to move horizontally, ensuring the stretching... The positioning of part 10 simultaneously enables rotary cutting of the drawn part 10, applicable to rotary cutting of various drawn parts 10, including continuous cutting of slender and narrow drawn parts 10; due to the attraction of the first magnet 16 and the second magnet 17, the drawn part 10 and the positioning ring 12 separate normally after the rotary cutting mold is opened, without affecting the continuity of operation; and the attraction of the first magnet 16 and the second magnet 17 can restore the positioning ring 12 to the initial position, which is convenient for positioning the drawn part 10 by the positioning ring 12 in the next use, avoiding defects such as inaccurate positioning and uneven cut surface. The invention realizes the action of the lower cutter 13 through the cooperation of the movable block 14 and the inner wall guide rail 151 of the guide rail seat 15, reducing energy consumption.

[0035] The guide rail base 15 includes four guide rail blocks, which are distributed around the movable block 14. Guide rails 151 are respectively provided on the inner wall of the guide rail blocks, and the guide rails 151 of two opposite guide rail blocks cooperate to clamp the movable block 14. During implementation, as the upper cutter 11 moves downward, the movable block 14 moves left, right, forward, and backward within the cavity formed by the four guide rail blocks. The actual effect is that the lower cutter 13 moves simultaneously in the left, right, forward, and backward directions. During this downward movement, the lower cutter 13 and the upper cutter 11 form a left, right, forward, and backward horizontal tearing action on the stretched part 10, realizing rotary cutting.

[0036] like Figure 8 As shown, it also includes a limiting post 19, which is fixedly connected to the upper cutter 11. The bottom of the limiting post 19 protrudes from the bottom surface of the upper cutter 11, and the bottom surface of the limiting post 19 can abut against the top surface of the lower cutter 13. In implementation, the limiting post 19 restricts the horizontal relative position of the upper cutter 11 and the lower cutter 13, preventing interference and damage to the lower cutter 13 during horizontal movement.

[0037] like Figure 6As shown, the cutting edge 111 of the upper cutter 11 is a concave arc. When the upper cutter 11 tears the stretched part 10 in a misaligned manner, it can form a small line segment contact shearing force, performing a small line segment shearing motion on the end of the stretched part 10, sequentially cutting the product waste in a ring shape in the forward direction. The longer the contact line when the upper cutter 11 and the stretched part 10 are misaligned during shearing, the more likely the upper cutter 11 is to break under lateral force, and defects such as product deformation and large burrs at the end will occur. Therefore, in this embodiment, for the stretched part 10 with a long straight end, the cutting edge 111 of the upper cutter 11 is made into a beveled structure, which greatly reduces the impact force of the upper cutter 11, enhances the tearing sharpness, extends the service life of the upper cutter 11, and improves the cutting effect.

[0038] like Figure 5 As shown, both sides of the upper cutter 11 and both sides of the positioning ring 12 are provided with smooth rounded corners to avoid sharp corner effect and breakage when the upper cutter 11 is subjected to force in the horizontal cutting edge under hardened state.

[0039] like Figure 5 As shown, the bottom edge of the positioning ring 12 is rounded to facilitate positioning within the cavity of the stretching member 10.

[0040] like Figure 5 As shown, the first magnet 16 is embedded in the upper cutter 11, and the second magnet 17 is embedded in the positioning ring 12 to prevent the first magnet 16 and the second magnet 17 from protruding from the surface of the part and to avoid interference, jamming, damage and other phenomena.

[0041] Example 2

[0042] This implementation is similar to Example 1, except that, as Figure 7 As shown, the upper cutter 11 is cylindrical, and a cylindrical first magnet 16 is inlaid at the bottom of the upper cutter 11. The end face of the first magnet 16 is flush with the bottom surface of the upper cutter 11. The positioning ring 12 is a hard engineering plastic structure, which can be processed from nylon rods. A conical groove is opened on the top surface of the positioning ring 12, and a conical second magnet 17 is inlaid in the conical groove. The end face of the second magnet 17 is flush with the top surface of the positioning ring 12. The rotary cutter 1 of this embodiment is suitable for the edge cutting operation of small and medium-sized circular drawn parts 10. Since the positioning ring 12 is a hard engineering plastic structure, the drawn parts 10 do not stick after rotary cutting, and the material is ejected smoothly. It is suitable for edge cutting operations of circular drawn parts 10 made of iron, aluminum, copper and other materials. It has strong versatility, improves the strength and service life of the cutter. When the cutter wears out, it is only necessary to grind the cutting edge flat in the magnetized state. Maintenance is convenient and quick.

[0043] Example 3

[0044] This embodiment is a rotary cutting mold, including an upper mold and a lower mold. The upper mold can move up and down along the lower mold. It also includes a rotary cutting blade 1 from Embodiment 1. The top of the upper cutting blade 11 is fixed to the upper mold, and the guide rail seat 15 is installed on the top of the lower mold.

[0045] In the aforementioned rotary cutting die, the upper cutter 11 is fixed to the upper die, and the guide rail seat 15 is installed on the lower die. When the upper die descends, the positioning ring 12 gradually enters the inner cavity of the drawn part 10. As the upper die continues to descend, it presses down the movable block 14. The guide rail 151 on the inner wall of the guide rail seat 15 cooperates with the movable block 14, causing the movable block 14 to move horizontally. This, in turn, causes the lower cutter 13 and its internal positioning ring 12 to move horizontally. During this downward movement, the lower cutter 13 and the upper cutter 11 perform a horizontal tearing action on the drawn part 10. This process enables rotary cutting, reducing energy consumption. Due to the attraction between the first magnet 16 and the second magnet 17, the positioning ring 12 hangs at the bottom of the upper cutter 11 after the rotary cutting mold is opened. The stretching part 10 and the positioning ring 12 separate normally, without affecting the continuity of the operation. It is suitable for rotary cutting of various stretching parts 10, including continuous cutting of slender and narrow stretching parts 10. Furthermore, the positioning ring 12 can be restored to its initial position by the attraction between the first magnet 16 and the second magnet 17, which facilitates the positioning of the stretching part 10 by the positioning ring 12 in the next use.

[0046] like Figure 8 As shown, the upper mold includes an upper mold base 2, an upper backing plate 3, and an upper fixing plate 4. The upper backing plate 3 connects the upper mold base 2 and the upper fixing plate 4, and the top of the upper cutter 11 is fixedly connected to the upper fixing plate 4. Specifically, the top of the upper cutter 11 has a pin hole 18, and the upper cutter 11 is connected to the upper fixing plate 4 through the engagement of the pin 18 with the pin hole 18. From the perspective of lever arm principle, the pin 18 extending out of the upper cutter 11 should not be too long or too short; 3mm is ideal.

[0047] The upper cutter 11 has several first fitting holes at its bottom, and the positioning ring 12 has several second fitting holes at its top. Each first fitting hole corresponds to one of the second fitting holes. A first magnet 16 is installed in a first fitting hole, and a second magnet 17 is installed in a second fitting hole. Specifically, the distance between the bottom surface of the first fitting hole and the bottom surface of the upper cutter 11 is not less than 3mm to ensure the strength of the upper cutter 11. The distance between the top surface of the second fitting hole and the top surface of the positioning ring 12 is 2mm to ensure good magnetic attraction. During impact operations, when small vibrations occur, the positioning ring 12 stably adheres to the bottom of the upper cutter 11 and moves up and down synchronously with the upper cutter 11. The external dimensions of the positioning ring 12 are 0.2–0.3mm smaller than the inner wall of the stretching member 10, facilitating the synchronous return of the stretching member 10 to its initial position after rotary cutting and allowing for smooth detachment from the stretching member 10.

[0048] like Figure 8As shown, the lower mold includes a lower mold base 5, a lower pad 6, and a lower fixing plate 7. The lower pad 6 is located between the lower mold base 5 and the lower fixing plate 7. The outer wall of the guide rail seat 15 is connected to the inner wall of the lower fixing plate 7. In implementation, the lower fixing plate 7 fixes the guide rail seat 15 to ensure that the movable block 14 and the lower cutter 13 can move normally in the horizontal direction when the upper mold moves downward.

[0049] like Figure 8 As shown, it also includes a retraction mechanism 8 for resetting the lower cutter 13, which is installed on the lower die. After the stretching part 10 is rotary cut, the upper die moves upward, and the retraction mechanism 8 acts on the movable block 14, causing the movable block 14 and the lower cutter 13 on it to retract and reset, facilitating the next rotary cutting operation.

[0050] like Figure 8 As shown, it also includes a material ejection mechanism 9, which is installed on the lower die and is used to eject the stretched part 10 after rotary cutting so that the stretched part 10 can be taken out.

[0051] Example 4

[0052] This embodiment is similar to Embodiment 3, except that, as Figure 8 As shown, the retraction mechanism 8 includes a spring box plate 81, a nitrogen spring 82, a support block 83, and a ball-head support rod 84. The spring box plate 81 is fixedly connected to the bottom of the lower mold base 5. The nitrogen spring 82 is fixedly installed on the spring box plate 81. The support block 83 is located on top of the nitrogen spring 82 and slides within the spring box plate 81. One end of the ball-head support rod 84 is fixed to the top of the support block 83, and the other end of the ball-head support rod 84 passes through the lower mold base 5 and the lower pad plate 6 in sequence and abuts against the bottom of the movable block 14. Specifically, the bottom of the lower mold base 5 is provided with a foot 51 to support the lower mold base 5 and to provide sufficient space for the installation of the spring box plate 81 and the nitrogen spring 82. During operation, the upper die descends, and the limiting post 19 contacts the lower cutter 13. The pressure is transmitted to the ball head support rod 84 through the movable block 14, and then to the support block 83 and the nitrogen spring 82. The lower die continues to descend, and the nitrogen spring 82 continues to compress. The movable block 14 moves horizontally forward, backward, left, and right while descending, until the rotary cutting action is completed. The upper die ascends, and the nitrogen spring 82 rebounds. Through the cooperation between the movable block 14 and the inner wall guide rail 151 of the guide rail seat 15, the nitrogen spring 82 pushes the movable block 14 back to the designed high point in reverse sequence. In this embodiment, a larger top pressure is used to maintain a uniform horizontal gap between the lower cutter 13 and the upper cutter 11, ensuring stability during the rotary cutting process and achieving an ideal cutting effect.

[0053] like Figure 8As shown, the ejector mechanism 9 includes a screw 91, a leveling sleeve 92, a spring 93, a top block 94, an ejector pin 95, and an ejector block 96. The leveling sleeve 92 is fitted around the outer periphery of the screw 91. The top of the screw 91 is connected to the movable block 14. The spring 93 is wound around the outer periphery of the leveling sleeve 92, and the two ends of the spring 93 are respectively connected to the bottom of the top block 94 and the bottom of the leveling sleeve 92. The ejector block 96 is located in the positioning cavity of the lower cutter 13. One end of the ejector pin 95 is connected to the top block 94, and the other end of the ejector pin 95 passes through the movable block 14 and abuts against the bottom of the ejector block 96. During operation, the positioning ring 12 presses the stretched part 10 onto the ejector block 96. The downward pressure is transmitted to the ejector pin 95 and the ejector block 94, forcing the spring 93 to compress. As the spring 93 moves downward, it comes into contact with the limit post 19 and the lower cutter 13. The compression action of the spring 93 is completed. During the time when the limit post 19 and the lower cutter 13 do not separate during the downward and upward movement of the upper mold, the spring 93 remains in a constant compressed state. After the edge of the stretched part 10 is cut, the upper mold moves upward, the movable block 14 retracts to the upper position, the screw 91 and the step sleeve reset, the limit post 19 separates from the lower cutter 13, the spring 93 rebounds in the opposite direction, and the ejector pin 95 retracts in the reverse sequence to push the stretched part 10 out of the positioning cavity of the lower cutter 13, making it easy to remove the stretched part 10 and clean the waste ring.

[0054] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A rotary cutting knife characterized by, The utility model relates to a rotary cutting cutter (1) which comprises an upper cutter (11), a positioning ring (12), a lower cutter (13), a movable block (14) and a guide rail seat (15), the lower cutter (13) is fixed on the top of the movable block (14), the lower cutter (13) is provided with a positioning cavity, the upper cutter (11) is provided with a first magnet (16), the positioning ring (12) is provided with a second magnet (17), the upper cutter (11) and the positioning ring (12) are connected by the adsorption of the first magnet (16) and the second magnet (17), the positioning ring (12) can be embedded in the positioning cavity, the inner wall of the guide rail seat (15) is provided with a guide rail (151), the movable block (14) is matched with the guide rail (151), the movable block (14) can move in the horizontal direction along the guide rail (151) while ascending and descending along the guide rail seat (15). The blade edge line (111) of the upper cutter (11) is an inner concave arc line.

2. The rotary cutting knife of claim 1, wherein, The guide rail seat (15) comprises four guide rail blocks, the four guide rail blocks are distributed around the movable block (14), the guide rail (151) is arranged on the inner wall of the guide rail block, and the guide rails (151) of the opposite two guide rail blocks clamp the movable block (14).

3. The rotary cutting knife of claim 1, wherein, The utility model also comprises a limiting column (19), the limiting column (19) is fixedly connected with the upper cutter (11), the bottom of the limiting column (19) protrudes from the bottom surface of the upper cutter (11), and the bottom surface of the limiting column (19) can abut against the top surface of the lower cutter (13).

4. The rotary cutting knife of claim 1, wherein, The two sides of the upper cutter (11) and the two sides of the positioning ring (12) are provided with smooth fillets.

5. A rotary cutting die comprising an upper die and a lower die, the upper die being movable in a lifting motion along the lower die, characterized in that, The utility model also comprises the rotary cutting cutter (1) of any one of claims 1-4, the top of the upper cutter (11) is fixed on the upper die, and the guide rail seat (15) is arranged on the top of the lower die.

6. The rotary cutting die of claim 5, wherein, The upper die comprises an upper die seat (2), an upper cushion plate (3) and an upper fixed plate (4), the upper cushion plate (3) is connected between the upper die seat (2) and the upper fixed plate (4), and the top of the upper cutter (11) is fixedly connected to the upper fixed plate (4).

7. The rotary cutting die of claim 5, wherein, The lower die comprises a lower die seat (5), a lower cushion plate (6) and a lower fixed plate (7), the lower cushion plate (6) is located between the lower die seat (5) and the lower fixed plate (7), and the outer wall of the guide rail seat (15) is connected to the inner wall of the lower fixed plate (7).

8. The rotary cutting die of claim 7, wherein, The back-off mechanism (8) for resetting the lower cutting knife (13) comprises a spring box plate (81), a nitrogen spring (82), a block (83) and a ball head supporting rod (84), the spring box plate (81) is fixedly connected to the bottom of the lower die seat (5), the nitrogen spring (82) is fixedly installed on the spring box plate (81), the block (83) is located at the top of the nitrogen spring (82) and slides in the spring box plate (81), one end of the ball head supporting rod (84) is fixed to the top of the block (83), and the other end of the ball head supporting rod (84) penetrates through the lower die seat (5) and the lower bed plate (6) in sequence and abuts against the bottom of the movable block (14).

9. The rotary cutting die of claim 8, wherein, The material returning mechanism (9) comprises a screw rod (91), an isometric sleeve (92), a spring (93), a top block (94), a thimble (95) and a material returning block (96), the screw rod (91) is sleeved with the isometric sleeve (92) on the outer periphery, the top of the screw rod (91) is connected with the movable block (14), the spring (93) is wound on the outer periphery of the isometric sleeve (92), and the two ends of the spring (93) are respectively connected to the bottom of the top block (94) and the bottom of the isometric sleeve (92), the material returning block (96) is located in the positioning cavity of the lower cutting knife (13), one end of the thimble (95) is connected to the top block (94), and the other end of the thimble (95) penetrates through the movable block (14) and abuts against the bottom of the material returning block (96).

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