Progressive die for helical blade

Abstract

The invention relates to the technical field of photovoltaic support manufacturing, in particular to a helical blade progressive die. The helical blade progressive die comprises an upper die and a lower die; the upper die and the lower die are sequentially provided with a punching section, an edge cutting section, a forming section and a cutting section in the conveying direction of plates. The distance between the punching section and the trimming section is equal to the distance between the forming section and the cutting section, the distance is defined to be equal to one step pitch, and the distance between the trimming section and the forming section is defined to be equal to two step pitches; the plates are conveyed step by step at a step pitch; the punching section is used for punching a datum hole in the plate; the edge cutting section is used for punching an outer arc profile of the spiral blade on the periphery of the reference hole; the forming section is used for punching a spiral structure of the spiral blade on the basis of the arc profile; and the cut-off section is used for cutting off the formed helical blade from the plate. Continuous machining and one-time forming of the spiral blade can be achieved, the production efficiency is improved, and the labor cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic support manufacturing, and particularly to a continuous die for spiral blades. Background Art

[0002] In the production process of spiral ground pile pipes, as one of the key components, the production efficiency and quality of spiral blades directly affect the production capacity of the entire production line and the product quality. Currently, the production of spiral blades mainly relies on traditional production methods, that is, flat sheet materials are first punched down by a punching press, and then a spinning process is carried out. The whole process requires manual assistance. However, this production method has an obvious efficiency bottleneck.

[0003] The Chinese patent application document with the publication number of CN110695115A discloses a spiral blade forming machine, which includes a main chassis, a support frame and a sub-chassis. A sliding cavity is provided in the middle of the support frame, and a movable die is slidably connected to the left side of the top of the sliding cavity. A reserved cavity is provided in the right part of the support frame, a hydraulic cylinder is fixed to the right side inside the reserved cavity, and the output end of the hydraulic cylinder is provided with a second connecting piece. A forming cavity is provided in the left part of the support frame, and a blade blank is arranged inside the forming cavity. The left end of the support frame is fixedly connected to the sub-chassis, and a fixing frame is arranged inside the sub-chassis. Pipe seats are welded to the front and rear sides of the bottom of the fixing frame, a vertical plate is welded to the central position of the top of the fixing frame, and a die is fixed to the right side of the vertical plate. When the above-mentioned spiral blade forming machine works, it is necessary to place the blade blank inside the forming cavity, make the die on the right side of the vertical plate contact and position the blade blank, and then start the hydraulic cylinder inside the reserved cavity, so that its output end drives the movable die to reciprocate inside the sliding cavity through the first connecting piece and the second connecting piece, so as to quickly complete the stamping and forming of the blade blank.

[0004] Although the above-mentioned spiral blade forming machine can realize the automatic stamping and forming of blade blanks, it is necessary to manually place the blade blanks inside the forming cavity first. The blade blanks are formed by stamping metal plates. After the spiral blades are formed, they need to be taken out and new blade blanks are placed, and so on. It can be seen that in the existing production methods, the production efficiency is greatly restricted. In the context of the increasing demand for spiral ground pile pipes, this low-efficiency production method can no longer meet the production requirements of the workshop. In addition, due to the discontinuity of each stamping and spinning, the utilization rate of the die is relatively low, and the total manufacturing cost of the die appears to be high under the production capacity accounting.

[0005] In order to solve these problems, the industry has been seeking more efficient and economical production methods. In this context, the present invention proposes a production plan for a continuous die for spiral blades, aiming to improve production efficiency, reduce die costs and labor costs through technological innovation. Summary of the Invention

[0006] The object of the present invention is to provide a continuous die for spiral blades, so as to solve the technical problems of low efficiency and high labor cost in the existing forming methods of spiral blades.

[0007] To solve the above problems, the continuous die for spiral blades provided by the present invention adopts the following technical solutions: A continuous die for spiral blades, comprising an upper die and a lower die; The upper die and the lower die are successively provided with corresponding punching sections, trimming sections, forming sections and cutting sections in the conveying direction of the sheet; The distance between the punching section and the trimming section is equal to the distance between the forming section and the cutting section. Define this distance as one pitch, and the distance between the trimming section and the forming section is equal to two pitches; the sheet is fed step by step at one pitch. The punching section is used to punch a reference hole in the sheet; The trimming section is used to punch out the outer arc contour of the spiral blade around the reference hole; The forming section is used to stamp out the spiral structure of the spiral blade on the basis of the outer arc contour; The cutting section is used to cut off the formed spiral blade from the sheet.

[0008] Further, the punching section includes a round hole punch provided on the upper die and a punching die provided on the lower die. The punching die and the round hole punch are opposite to each other up and down. During the downward movement of the upper die, the reference hole is punched out; a first round hole positioning structure is provided at the trimming section. The first round hole positioning structure includes a first positioning post and a first positioning hole respectively provided on the upper die and the lower die. The aperture of the first positioning hole is equal to the aperture of the punching die, and the distance between the first positioning hole and the punching die is equal to the pitch.

[0009] Further, two rows of floating blocks are arranged at intervals in the direction perpendicular to the conveying direction of the sheet on the lower die. The floating blocks can expand and contract in the up and down direction; floating block relief grooves corresponding to the floating blocks one by one are provided on the upper die; a limiting channel for the sheet to be conveyed is formed between the two rows of floating blocks.

[0010] Further, guiding and limiting grooves for the sheet to pass through are provided on one side of the two rows of floating blocks opposite to each other.

[0011] Further, the trimming section includes a first trimming punch provided on the upper die, a second trimming punch, and a first trimming die and a second trimming die correspondingly provided on the lower die; the first trimming die is located between the punching die and the first positioning hole, the first trimming die has a first inner arc side wall and a second inner arc side wall, and the second trimming die has a third inner arc side wall and a fourth inner arc side wall; the axis of the cylinder where the first inner arc side wall is located coincides with the axis of the cylinder where the first punching die is located, and the second inner arc side wall and the third inner arc side wall are located on the same cylinder; the axis of the cylinder where the fourth inner arc side wall is located is parallel to the axis of the cylinder where the second inner arc side wall is located, and the radii of the two cylinders are equal, and the distance between the two cylinders is one pitch.

[0012] Further, the second trimming die further has a fifth inner arc side wall, and the fifth inner arc side wall is tangent to the third inner arc side wall.

[0013] Further, the punching die, the first trimming die, and the second trimming die are all detachably connected to the lower die.

[0014] Further, the forming section includes an upper forming block provided on the upper die and a lower forming block provided on the lower die. Both the upper forming block and the lower forming block have spiral forming surfaces that match the shape and size of the spiral surface of the spiral blade; during the downward movement stroke of the upper die, the upper forming block moves downward to contact the sheet metal at the forming section and press it downward and bend it until the lower surface of the sheet metal abuts against the lower forming block.

[0015] Further, a second round hole positioning structure is provided at the forming section. The second round hole positioning structure includes a second positioning post provided on the upper forming block and a second positioning hole provided on the lower forming block. The second positioning post is positioned and inserted into the second positioning hole during the downward movement stroke of the upper die; the aperture of the second positioning hole is the same as the aperture of the punching die, and the distance between the second positioning hole and the first positioning hole is equal to two pitches.

[0016] Further, the cutting section includes a cutting opening located on the lower die and a cutting knife located on the upper die; a material conveying groove is further provided on the lower die, and the material conveying groove is obliquely arranged and communicated with the cutting opening.

[0017] The beneficial effects of the continuous die for spiral blades of the present invention are as follows: 1. Greatly improved production efficiency: Through the multi-section design of the present invention, when the sheet metal is step-fed at a fixed pitch, punching, trimming, forming, and cutting can be sequentially achieved; the sheet metal can be processed into spiral blades at one time without removing the flat blade and then performing spiral stamping, and the production capacity can be doubled under the same processing time. Compared with the traditional secondary processing method, the present invention greatly improves the production efficiency, meets the growing market demand for spiral ground pile pipes, and has a wide application prospect.

[0018] 2. Die utilization rate and cost optimization: Since the spiral blade can be directly produced by each stamping, the die utilization rate and labor cost of the present invention have been greatly improved compared with the traditional method. This not only reduces the proportion of the total die manufacturing cost in the production capacity accounting, but also reduces the labor intensity and labor cost, and further reduces the production cost.

[0019] 3. Flexible structure and easy maintenance: The continuous die of the spiral blade of the present invention adopts a detachable punching structure, so that key components such as the punching concave die, the first trimming concave die, and the second trimming concave die can be conveniently replaced. This design not only improves the flexibility of the die, but also facilitates rapid repair and replacement when the die is worn or damaged, reducing the downtime and maintenance cost.

[0020] 4. High processing accuracy and stable product quality: Through precise die design and manufacturing, the present invention can ensure the processing accuracy and dimensional consistency of the spiral blade. This helps to improve the overall quality and stability of the spiral ground pile pipe, and reduces quality problems caused by inconsistent blade sizes or insufficient processing accuracy.

[0021] 5. High degree of automation and reduced manual intervention: The design of the continuous die of the spiral blade of the present invention enables the sheet to move and position automatically during the processing, and the sheet is continuously fed step by step, realizing continuous operation without stopping, and reducing the need for manual auxiliary operations. This not only improves the automation degree of the production line, but also reduces the labor cost and operation difficulty. Description of the Drawings

[0022] Figure 1 is a three-dimensional structure schematic diagram of the continuous die of the spiral blade of the present invention; Figure 2 is a bottom view of the upper die of the continuous die of the spiral blade of the present invention; Figure 3 is a top view of the lower die of the continuous die of the spiral blade of the present invention; Figure 4 is a processing schematic diagram of four sections of the continuous die of the spiral blade of the present invention; Figure 5 is a detailed schematic diagram of the first trimming concave die of the continuous die of the spiral blade of the present invention; Figure 6 is a detailed schematic diagram of the second trimming concave die of the continuous die of the spiral blade of the present invention; Figure 7 is a matching schematic diagram between the floating block and the conveyed sheet of the continuous die of the spiral blade of the present invention.

[0023] Description of the Reference Numerals: 1. Upper die; 2. Lower die; 3. Upper die base; 4. Upper template; 5. Upper stripper plate; 6. Upper backing plate; 7. Lower die base; 8. Lower backing plate; 9. Plate; 10. Round hole punch; 11. Punching die; 12. First positioning post; 13. First positioning hole; 14. Second positioning post; 15. Second positioning hole; 16. Floating block; 17. Floating block relief groove; 18. Guide and limit groove; 19. First inner arc side wall; 20. Second inner arc side wall; 21. Third inner arc side wall; 22. Fourth inner arc side wall; 23. Fifth inner arc side wall; 24. Upper forming block; 25. Lower forming block; 26. Fixed counterbore; 27. Cutting knife; 28. Cutting edge; 29. Feeding groove; 30. Lower template; 31. Spiral blade; 32. First trimming die; 33. Second trimming die; 34. First trimming punch; 35. Second trimming punch. Detailed implementation manners

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are a part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0025] The following will elaborate on the principles and spirits of the present invention in detail with reference to several representative embodiments of the present invention.

[0026] An embodiment of the spiral blade progressive die provided by the present invention: As Figure 1 shown, a spiral blade progressive die includes an upper die 1 and a lower die 2, and the upper die 1 can move towards the lower die 2 under the action of a hydraulic mechanism. The upper die 1 includes an upper stripper plate 5, an upper template 4, an upper backing plate 6 and an upper die base 3 arranged in sequence from bottom to top; the lower die 2 includes a lower template 30, a lower backing plate 8 and a lower die base 7 arranged in sequence from top to bottom.

[0027] As Figure 4 shown, the upper die 1 and the lower die 2 are successively provided with corresponding punching sections, trimming sections, forming sections and cutting sections in the conveying direction of the plate 9. Among them, the punching section is used to punch a reference hole in the plate 9; the trimming section is used to punch the outer arc contour of the spiral blade 31 around the reference hole; the forming section is used to stamp the spiral structure of the spiral blade 31 on the basis of the outer arc contour; the cutting section cuts the formed spiral blade 31 from the above-mentioned plate 9. When the upper die 1 moves down, it can punch, trim, form or cut the material placed on the lower die 2.

[0028] As Figure 4As shown, the distance between the punching section and the trimming section is equal to the distance between the forming section and the cutting section. This distance is defined as one pitch; the distance between the trimming section and the forming section is equal to two pitches, leaving enough space for the forming process to avoid interference between sections, ensuring the coordinated movement of each section, and improving the operating stability of the die. In this embodiment, the sheet metal 9 is step-fed forward by a corresponding step-feed device by one pitch to ensure that the sheet metal 9 can enter the punching section, trimming section, forming section, and cutting section in sequence for processing operations.

[0029] Specifically, as Figure 1 shown, there are two rows of floating blocks 16 provided on the lower die 2. The two rows of floating blocks 16 are arranged at intervals in the direction perpendicular to the conveying direction of the sheet metal 9. Each row includes a plurality of floating blocks 16 arranged at intervals in the conveying direction of the sheet metal 9. The floating blocks 16 can expand and contract in the up and down direction, and a buffer spring is connected to the bottom of the floating blocks 16. On the upper stripping plate 5 of the upper die 1, there are floating block relief grooves 17 inserted corresponding to each floating block 16 one by one; a limiting channel for the conveying of the sheet metal 9 is formed between the two rows of floating blocks 16, and the sheet metal 9 is step-fed from the above-mentioned limiting channel. In actual production, the sheet metal 9 is strip steel.

[0030] To further ensure the accuracy of the conveying direction of the sheet metal 9, as Figure 7 shown, guiding and limiting grooves 18 are opened on the opposite sides of the two rows of floating blocks 16. The openings of the two rows of guiding and limiting grooves 18 face each other, and the sheet metal 9 passes through the two rows of guiding and limiting grooves 18. The floating blocks 16 can lift the sheet metal 9, reducing the friction between the sheet metal 9 and the lower die 2, making the step feeding smoother, and avoiding conveying jams or position offsets caused by large frictional forces. The guiding and limiting grooves 18 limit the offset of the sheet metal 9 in the vertical conveying direction, cooperate with the pitch for positioning, and ensure the accurate positioning of the sheet metal 9 in both the conveying direction and the vertical conveying direction, providing a guarantee for high-precision processing.

[0031] As Figure 2 and Figure 3 shown, the punching section includes a round hole punch 10 provided on the upper die 1 and a punching die 11 provided on the lower die 2. The punching die 11 and the round hole punch 10 face each other up and down, and their shapes and sizes match each other. During the downward movement of the upper die 1, the round hole punch 10 is inserted into the punching die 11 to punch a reference hole in the sheet metal 9. The subsequent sections can cut out the spiral blade 31 based on this reference hole. The design of the punching section ensures the accuracy of the hole shape and provides a reliable positioning reference for the subsequent processes.

[0032] At the trimming section, a first round-hole positioning structure is provided. The first round-hole positioning structure includes a first positioning post 12 and a first positioning hole 13 respectively arranged on the upper die 1 and the lower die 2. In this embodiment, the first positioning post 12 is a semi-cylindrical post, and the first positioning hole 13 is a semi-circular hole. The outer diameter of the first positioning post 12, the aperture of the first positioning hole 13, and the aperture of the punching die 11 are all equal. The distance between the first positioning hole 13 and the punching die 11 is equal to one pitch. When the sheet 9 moves one pitch after punching, the reference hole is precisely matched with the first positioning post 12 to achieve the locking of the position across sections, solve the problem of "insufficient positioning accuracy", ensure the accuracy of the processing positions of each section, and achieve the consistency of cross-section positioning.

[0033] The trimming section includes a first trimming punch 34, a second trimming punch 35 arranged on the upper die 1, and a first trimming die 32, a second trimming die 33 correspondingly arranged on the lower die 2. Among them, the first trimming die 32 is located between the punching die 11 and the first positioning hole 13, and the first trimming punch 34 is located between the round-hole punch 10 and the first positioning post 12. The upper surfaces of the first trimming groove 32, the second trimming die 33, and the punching die 11 all protrude from the lower template 30, and their upper surfaces are flush.

[0034] As Figure 5 shown, the first trimming die 32 has a first inner arc side wall 19 and a second inner arc side wall 20. As Figure 6 shown, the second trimming die 33 has a third inner arc side wall 21, a fourth inner arc side wall 22, and a fifth inner arc side wall 23. The axis of the cylinder where the first inner arc side wall 19 is located coincides with the axis of the cylinder where the first punching die 11 is located. The second inner arc side wall 20 and the third inner arc side wall 21 are located on the same cylinder. The axis of the cylinder where the fourth inner arc side wall 22 is located is parallel to the axis of the cylinder where the second inner arc side wall 20 is located, and the radii of the two cylinders are equal. The distance between the two cylinders is one pitch. The fifth inner arc side wall 23 is tangent to the third inner arc side wall 21.

[0035] On the lower die 2, a blanking channel communicating with the first trimming die 32, the second trimming die 33, and the punching die 11 is provided. The waste of the sheet 9 punched by the round-hole punch 10, the first trimming punch 34, and the second trimming punch 35 is discharged through the blanking channel.

[0036] In this embodiment, the punching die 11, the first trimming die 32, and the second trimming die 33 are all provided with fixed countersunk holes 26, and the punching die 11, the first trimming die 32, and the second trimming die 33 are fixed to the lower die 2 by inserting bolts in the fixed countersunk holes 26. The detachable structure allows key components such as the punching die 11, the first trimming die 32, and the second trimming die 33 to be easily replaced. This design not only improves the flexibility of the spiral blade continuous die, but also facilitates rapid repair and replacement of the spiral blade continuous die when it is worn or damaged, reducing downtime and maintenance costs.

[0037] like Figure 2 and Figure 3 As shown, the forming section includes an upper forming block 24 disposed on the upper die 1 and a lower forming block 25 disposed on the lower die 2, and both the upper forming block 24 and the lower forming block 25 have a spiral forming surface that matches the spiral surface shape and size of the spiral blade 31. When the upper die 1 moves downward, the upper forming block 24 moves downward, and can contact the upper surface of the plate 9 and bend its edge downward until the lower surface of the plate 9 contacts the lower forming block 25, at which time a spiral structure can be formed on the plate 9.

[0038] A second circular hole positioning structure is provided at the forming section, and the second circular hole positioning structure includes a second positioning column 14 provided on the upper forming block 24 and a second positioning hole 15 provided on the lower forming block 25. The second positioning column 14 is a cylinder, and the second positioning hole 15 is a circular hole. The second positioning column 14 is positioned and plugged with the second positioning hole 15 during the downward movement of the upper die; the aperture of the second positioning hole 15 is the same as the aperture of the punching die 11, and the distance between the second positioning hole 15 and the first positioning hole 13 is equal to two steps. It should be noted that when the sheet 9 is transported forward one step from the trimming section, it is in an empty walking state. Within this step, the sheet 9 that has been trimmed does not undergo any processing, in order to avoid interference between the trimming section and the forming section.

[0039] The cutting section includes a cutting port 28 on the lower die 2 and a cutting knife 27 on the upper die. A feed trough 29 is also provided on the lower die. The feed trough 29 is arranged tilted from front to back in the conveying direction of the plate 9, and the feed trough 29 is connected to the cutting port 28. After the spiral blade 31 is formed and moves according to the next step, the upper die 1 moves downward, and after the upper stripping plate 5 presses the upper surface of the plate 9, the cutting knife 27 cuts off the connection between the spiral blade 31 and the plate 9. The cut spiral blade 31 can fall naturally along the inclined surface on the feed trough 29 under the action of its own gravity, without the need for manual removal. This design not only simplifies the material unloading process, realizes the "cutting-collecting" automation, and further reduces manual intervention, but also effectively avoids damage to the spiral blade 31 during the material unloading process, thereby improving the yield rate.

[0040] The continuous die for spiral blades of the present invention enables the sheet 9 to be continuously conveyed at a fixed pitch through a segmented station design, eliminating the need for manual loading and unloading. It realizes the automated processing of the process of "punching → trimming → forming → cutting", and can directly process the sheet into spiral blades in one step, without the need to remove the flat blades and then perform spiral stamping, achieving continuous production. Compared with the traditional secondary forming process, the present invention can double the production capacity in the same processing time, greatly improving production efficiency.

[0041] It should be noted that the second trimming punch 35 and the second trimming groove 33 can be designed according to the actual size and shape of the spiral blade 31. For example, in some cases, the fifth inner arc side wall 23 is not provided on the second trimming die 33.

[0042] In addition, it should be noted that Figure 1 In the shown three-dimensional structure diagram, the state of the upper die is when it moves downward in place. At this time, the upper stripper plate 5 is in contact with the upper template 4. During actual operation, the upper die moves downward. The upper stripper plate 5 first contacts the lower template 30, and then the upper template 4 moves downward relative to the upper stripper plate 5 for punching, trimming, forming, cutting, etc.; after the die is lifted, there is a certain distance between the upper stripper plate 5 and the upper template 4.

[0043] In the description of this specification, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise specifically defined.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A continuous die for spiral blades, characterized in that, Including upper die and lower die; The upper die and the lower die are provided with corresponding punching sections, trimming sections, forming sections and cutting sections in sequence in the conveying direction of the plate; The spacing between the punching section and the trimming section is equal to the spacing between the forming section and the cutting section, which is defined as one step distance, and the spacing between the trimming section and the forming section is equal to two step distances; the sheet is conveyed in a step-by-step manner with one step distance; The punching section is used to punch out reference holes on the plate; The trimming section is used to punch out the outer arc contour of the spiral blade on the periphery of the reference hole; The forming section is used for punching out the spiral structure of the spiral blade based on the outer arc contour; The cutting section is used to cut the formed spiral blades from the plate.

2. The progressive die for spiral blades according to claim 1, characterized in that, The punching section includes a circular hole punch arranged on the upper die and a punching die arranged on the lower die, the punching die and the circular hole punch are opposite to each other up and down, and the reference hole is punched out during the downward movement of the upper die; a first circular hole positioning structure is provided at the trimming section, the first circular hole positioning structure includes a first positioning column and a first positioning hole respectively arranged on the upper die and the lower die, the aperture of the first positioning hole is equal to the aperture of the punching die, and the distance between the first positioning hole and the punching die is equal to the pitch.

3. The progressive die for spiral blades according to claim 1, characterized in that, The lower die is provided with two rows of floating blocks spaced apart in a direction perpendicular to the plate conveying direction, and the floating blocks can be extended and retracted in the up and down directions; the upper die is provided with floating material giving way grooves corresponding to the floating blocks one by one; a limiting channel for plate conveying is formed between the two rows of floating blocks.

4. A continuous die for spiral blades according to claim 3, characterized in that One side opposite to the two rows of floating material blocks is provided with a guide limiting groove for the plates to pass through.

5. The progressive die for spiral blades according to claim 2, wherein The trimming section comprises a first trimming convex die and a second trimming convex die arranged on the upper die and a first trimming concave die and a second trimming concave die arranged on the lower die accordingly; The first trimming die is located between the punching die and the first positioning hole, the first trimming die has a first inner arc side wall and a second inner arc side wall, and the second trimming die has a third inner arc side wall and a fourth inner arc side wall; the axis of the cylinder where the first inner arc side wall is located coincides with the axis of the cylinder where the first punching die is located, and the second inner arc side wall and the third inner arc side wall are located on the same cylinder; the axis of the cylinder where the fourth inner arc side wall is located is parallel to the axis of the cylinder where the second inner arc side wall is located, and the radii of the two cylinders are equal, and the distance between the two cylinders is a step distance.

6. The progressive die for spiral blades according to claim 5, characterized in that, The second trimming die also has a fifth inner arc side wall, which is tangent to the third inner arc side wall.

7. A continuous die for spiral blades according to claim 5, characterized in that, The punching die, the first trimming die and the second trimming die are all detachably connected to the lower die.

8. A continuous die for spiral blades according to any one of claims 2-7, characterized in that, The forming section includes an upper forming block arranged on the upper die and a lower forming block arranged on the lower die, and both the upper forming block and the lower forming block have a spiral forming surface that matches the shape and size of the spiral surface of the spiral blade; during the downward movement stroke of the upper die, the upper forming block moves downward to contact the plate at the forming section and presses it downward to bend it until the lower surface of the plate contacts the lower forming block.

9. A continuous die for spiral blades according to claim 8, characterized in that, A second round hole positioning structure is provided at the forming section. The second round hole positioning structure includes a second positioning post provided on the upper forming block and a second positioning hole provided on the lower forming block. The second positioning post is inserted into the second positioning hole for positioning during the downward movement of the upper die; the aperture of the second positioning hole is the same as that of the punching die, and the distance between the second positioning hole and the first positioning hole is equal to two pitch distances.

10. A continuous die for spiral blades according to claim 1, characterized in that, The cutting section includes a cutting opening located on the lower die and a cutting knife located on the upper die; a material conveying groove is further provided on the lower die, and the material conveying groove is arranged obliquely and communicated with the cutting opening.

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