Die steel forging cutting device

The design of the die steel forging cutting device enables synchronous cutting and equal-length cutting of four ends of cross-shaped die steel forging, solving the problem of low cutting efficiency in the existing technology, improving cutting efficiency and extending the service life of the saw blade.

CN121104196AInactive Publication Date: 2025-12-12扬州志程机械锻造有限公司
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Patent Information

Application Number
CN202511447202.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-11
Publication Date
2025-12-12
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing sawing machines require cutting the four ends of a cross-shaped die steel forging in four separate cuts, resulting in low cutting efficiency and difficulty in ensuring that the four ends are of equal length.

Method used

A die steel forging cutting device is adopted, which drives the circular saw blades on four saw shafts to rotate synchronously through the central shaft, and uses support rings and clamping parts to position the cross-shaped die steel forging to ensure that all four ends are cut at the same time; at the same time, the servo motor drives the coordinated movement of the cutting seat and the push saw frame to realize the intermittent cutting and cooling gap of the circular saw blades, reducing the continuous load.

Benefits of technology

It enables simultaneous cutting of all four ends of a cross-shaped die steel forging, shortening the cutting time, improving cutting efficiency, ensuring equal length at all four ends, and extending the service life of the circular saw blade.

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Abstract

The invention relates to the field of saw cutting, in particular to a die steel forging cutting device which comprises a cutting table, a saw moving part is arranged on the rear portion of the upper end of the cutting table, a portal frame is connected to the saw moving part, a four-claw frame is fixedly installed at the lower end of the portal frame, and a gear box is fixedly installed on the inner side of the four-claw frame. A center shaft is rotatably installed in the middle of the upper end of the four-claw frame in a penetrating mode and connected with the input end of the gear box, four saw shafts are rotatably installed at the end of the four-claw frame in an annular array penetrating mode with the center shaft as the center, and the ends of the saw shafts are connected with the output end of the gear box. And a circular saw blade is coaxially and fixedly mounted on the outer surface of the saw shaft. The cutting time is shortened, the cutting efficiency is improved, it is guaranteed that the four ends of the cross-shaped die steel forging are equal in length after cutting, the machining requirement is met, and meanwhile the service life of the circular saw blade is prolonged.
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Description

TECHNICAL FIELD

[0001] The present application relates to the field of sawing, in particular to a die steel forging cutting device. BACKGROUND

[0002] Sawing is a processing method of cutting materials by using the cutting edge of a sawing tool such as a saw blade, which is widely used in the blanking, cutting or forming processing of materials such as metals, wood and plastics, and is one of the basic processes in the mechanical manufacturing, construction and building material industries. When processing die steel forgings, a sawing machine is often used for cutting to remove excess parts.

[0003] However, the existing sawing machine can only cut one end of the cross-shaped die steel forging at a time when cutting some cross-shaped die steel forgings, and it needs to be cut four times to cut the four ends of the cross-shaped die steel forging to the required length, and the four ends are equal in length, which takes a long time and results in low cutting efficiency. SUMMARY

[0004] The purpose of the present application is to solve the problems in the background art and provide a die steel forging cutting device.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a die steel forging cutting device, comprising a cutting table, a moving saw piece is arranged at the upper end of the rear part of the cutting table, a portal frame is connected to the moving saw piece, a four-jaw frame is fixedly installed at the lower end of the portal frame, a gear box is fixedly installed on the inner side of the four-jaw frame, a central shaft is rotatably installed through the upper end of the middle part of the four-jaw frame, the central shaft is connected with the input end of the gear box, four saw shafts are rotatably installed in an annular array around the central shaft at the end of the four-jaw frame, the end of the saw shaft is connected with the output end of the gear box, a circular saw blade is coaxially fixedly installed on the outer surface of the saw shaft, a servo motor is fixedly installed on the side of the portal frame, a conical gear is inlaid on the output end of the servo motor and the upper end of the central shaft, the two conical gears are meshed, a cross seat is fixedly installed at the upper end of the front part of the cutting table, four supporting rings are fixedly installed in an annular array around the central shaft at the upper end of the cross seat, a pressing piece is installed at the lower end of the cross seat, and the inner diameter of the supporting ring is matched with the diameter of the end of the cross-shaped die steel forging.

[0006] Preferably, the pressing piece comprises a threaded column rotatably installed in the middle part of the lower end of the cross seat, the lower end of the threaded column is rotatably connected with the cutting table, a threaded ring is screwed on the outer surface of the upper part of the threaded column, a plate column is fixedly installed on the outer surface of the threaded ring, a pressing plate is fixedly installed on the upper end of the plate column, and the pressing plate is located above the cross seat.

[0007] Preferably, the outer surface of the plate column is slidingly installed with a guide sleeve, the guide sleeve is fixed with a cross seat, and the outer surface of the lower part of the threaded column is coaxially fixedly installed with a hand wheel.

[0008] Preferably, the moving saw part comprises a stand fixedly installed at the rear upper end of the cutting table, the front end of the stand is slidingly installed with a cutting seat, the front end of the cutting seat is symmetrically fixedly installed with two guide columns, the outer surfaces of the two guide columns are slidingly installed with sliding blocks, the front ends of the sliding blocks are fixed with the rear end of the door frame, the front part of the side surface of the cutting seat is fixedly installed with an L-shaped carrier, the end of the L-shaped carrier is rotatably installed with a pushing shaft, one end of the pushing shaft extends with a pushing claw, the end of the pushing claw is rotatably installed with a pushing saw frame, and the pushing saw frame is connected with the door frame.

[0009] Preferably, the rear upper end of the cutting seat is rotatably installed with a bearing shaft, the inner top surface of the stand is fixedly installed with a threaded rod, the lower end of the threaded rod is fixed with the cutting table, the outer surface of the threaded rod is screwed with a threaded sleeve, the rear end of the cutting seat is rotatably connected with the threaded sleeve, the threaded sleeve is connected with the bearing shaft, the rear part of the side surface of the cutting seat is fixedly installed with a second servo motor, and the bearing shaft and the pushing shaft are connected with the second servo motor.

[0010] Preferably, the other end of the pushing shaft and the outer surface of the output end of the second servo motor are coaxially embedded with a connecting belt pulley, and two connecting belt pulleys are connected with a second belt.

[0011] Preferably, the end of the output end of the second servo motor and the upper end of the bearing shaft are coaxially embedded with a second bevel gear, two second bevel gears are meshed, the outer surface of the bearing shaft is coaxially embedded with a small belt pulley, the outer surface of the upper part of the threaded sleeve is coaxially embedded with a large belt pulley, and the large belt pulley and the small belt pulley are connected with a first belt.

[0012] Preferably, the upper end of the door frame is fixedly installed with a connecting seat, and the end of the pushing saw frame is rotatably installed in the inner part of the connecting seat.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] 1、 through the center axis of rotation, can pass through the gear box drive four saw shaft on the circular saw blade synchronous rotation, to simultaneously on the four ends of cross-shaped die steel forging cutting, avoid the phenomenon of cutting four times, in order to effectively shorten the cutting time, improve the cutting efficiency, at the same time in the four circular saw blade and the ring array arrangement centering on the center axis, when the cross-shaped die steel forging is placed on the cross-shaped seat, four ring will be clamped in the four ends of cross-shaped die steel forging, in order to position the cross-shaped die steel forging, make the center of cross-shaped die steel forging and the center axis alignment, make the subsequent four circular saw blade under the center axis of the ring array arrangement, while cutting the four ends of cross-shaped die steel forging, the four ends of cross-shaped die steel forging can be the same length, in order to ensure that the four ends of cross-shaped die steel forging after cutting, meet the processing needs.

[0015] 2、 No. 2 servo motor work drive bearing shaft rotation, in turn drive the threaded sleeve slowly rotate, on the threaded rod slowly down, in turn drive the cutting seat slowly down, let the circular saw blade on the cutting seat can be in contact with cross-shaped die steel forging cutting, in this process, No. 2 servo motor will also drive the push jaw on the push shaft rotation, in order to drive the push saw frame movement to push the door frame, at this time the sliding block on the guide post sliding, in order to guide the door frame, make the door frame can be constantly moving up and down, in turn drive the circular saw blade constantly moving up and down when cutting, let the circular saw blade after cutting a small part of the cross-shaped die steel forging, can move up, then down again to cut the cross-shaped die steel forging, in this cycle, let the circular saw blade can intermittent force, to reduce the continuous load time of circular saw blade, prolong the service life of circular saw blade, at the same time, the circular saw blade can leave cooling gap when moving up, to avoid the circular saw blade overheat phenomenon, in order to further prolong the service life of circular saw blade. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 for the structure of the present application a die steel forging cutting device schematic diagram;

[0017] Figure 2 for the structure of the present application a die steel forging cutting device Figure 1 the enlarged view of A;

[0018] Figure 3 for the structure of the present application a die steel forging cutting device threaded column place schematic diagram;

[0019] Figure 4 for the structure of the present application a die steel forging cutting device cutting seat place schematic diagram;

[0020] Figure 5 for the structure of the present application a die steel forging cutting device push saw frame place schematic diagram;

[0021] Figure 6This is a schematic diagram of the circular saw blade of a die steel forging and cutting device according to the present invention;

[0022] Figure 7 This is a view showing the use of a die steel forging and cutting device according to the present invention;

[0023] Figure 8 This is a schematic diagram of a cross-shaped die steel forging for a die steel forging and cutting device according to the present invention.

[0024] In the diagram: 1. Cutting table; 2. Stand; 3. Threaded sleeve; 4. Cutting seat; 5. L-shaped carrier; 6. Gantry; 7. Circular saw blade; 8. Threaded column; 9. Threaded rod; 10. Support ring; 11. Pressure plate; 12. Plate column; 13. Guide sleeve; 14. Threaded ring; 15. Cross-shaped die steel forging; 16. Handwheel; 17. Cross seat; 18. Servo motor No. 1; 19. Gearbox; 20. Saw shaft; 21. Four-jaw holder; 22. Central shaft; 23. Bevel gear No. 1; 24. Connecting seat; 25. Slider; 26. Servo motor No. 2; 27. Bevel gear No. 2; 28. Bearing shaft; 29. ​​Small pulley; 30. Belt No. 1; 31. Large pulley; 32. Belt No. 2; 33. Connecting pulley; 34. Push saw frame; 35. Guide column; 36. Push shaft; 37. Push claw. Detailed Implementation

[0025] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0026] like Figures 1-8The illustrated die steel forging cutting device includes a cutting table 1. A moving saw is provided at the upper rear of the cutting table 1, and a gantry 6 is connected to the moving saw. A four-jaw bracket 21 is fixedly installed at the lower end of the gantry 6. A gearbox 19 is fixedly installed on the inner side of the four-jaw bracket 21. The four-jaw bracket 21 serves to support the gearbox 19 and the saw shafts 20. A central shaft 22 is rotatably mounted through the middle of the upper end of the four-jaw bracket 21. The central shaft 22 is connected to the input end of the gearbox 19. Four saw shafts 20 are rotatably mounted in a circular array around the central shaft 22 at the end of the four-jaw bracket 21. When a cross-shaped die steel forging is cut, the saw shafts 20 are cut. When the center of the saw shaft 15 is aligned with the central axis 22, the four circular saw blades 7 arranged in a ring around the central axis 22 move down and simultaneously cut the four ends of the cross-shaped die forging 15. This ensures that the four ends of the cross-shaped die forging 15 are of equal length after cutting. The end of the saw shaft 20 is connected to the output end of the gearbox 19. The rotation of the central axis 22 drives the four saw shafts 20 to rotate synchronously through the gearbox 19. Since using the gearbox 19 to drive the rotation of multiple shafts is existing technology and has been widely used, it is not described in detail here. Circular saw blades are coaxially fixedly mounted on the outer surface of the saw shaft 20. A servo motor 18 is fixedly mounted on the side of the gantry 6. The servo motor 18 drives the central shaft 22 to rotate. A bevel gear 23 is coaxially embedded at both the output end of the servo motor 18 and the upper end of the central shaft 22. The bevel gear 23 connects the output end of the servo motor 18 and the central shaft 22. The two bevel gears 23 mesh. A cross seat 17 is fixedly mounted on the upper front part of the cutting table 1. Four support rings 10 are fixedly mounted in a circular array around the central shaft 22 on the upper end of the cross seat 17. The cross seat 17 serves to support... The support rings 10 bear the load. With the support rings 10 arranged in a ring array around the central axis 22, when the cross-shaped die steel forging 15 is placed on the cross seat 17, the four support rings 10 will engage with the four ends of the cross-shaped die steel forging 15 to position the cross-shaped die steel forging 15, aligning the center of the cross-shaped die steel forging 15 with the central axis 22. The lower end of the cross seat 17 is equipped with a clamping element. The inner diameter of the support rings 10 is adapted to the end diameter of the cross-shaped die steel forging 15, which allows the support rings 10 and the cross-shaped die steel forging 15 to fit together fully, so as to avoid errors during positioning.

[0027] The clamping component includes a threaded post 8 rotatably mounted at the lower middle part of the cross seat 17. The lower end of the threaded post 8 is rotatably connected to the cutting table 1. A threaded ring 14 is screwed onto the upper part of the outer surface of the threaded post 8. A plate post 12 is fixedly mounted on the outer surface of the threaded ring 14. A pressure plate 11 is fixedly mounted on the upper end of the plate post 12. The plate post 12 serves to connect the pressure plate 11. The pressure plate 11 is located above the cross seat 17. Rotating the threaded post 8 causes the threaded ring 14 to move downward, which in turn causes the pressure plate 11 on the plate post 12 to move downward, thereby pressing it against the cross-shaped die steel forging 15 and fixing the cross-shaped die steel forging 15.

[0028] A guide sleeve 13 is slidably installed on the outer surface of the plate column 12. The guide sleeve 13 is fixed to the cross seat 17. The guide sleeve 13 serves to guide the plate column 12. A handwheel 16 is coaxially fixed on the lower part of the outer surface of the threaded column 8. The handwheel 16 facilitates the rotation of the threaded column 8.

[0029] The moving saw assembly includes a support frame 2 fixedly installed at the upper rear of the cutting table 1. A cutting seat 4 is slidably installed at the front end of the support frame 2, which provides a sliding surface for the cutting seat 4. Two guide posts 35 are symmetrically fixedly installed at the front end of the cutting seat 4, and sliders 25 are slidably installed on the outer surfaces of the two guide posts 35. The front end of the sliders 25 is fixed to the rear end of the gantry 6. The cooperation between the guide posts 35 and the sliders 25 guides the gantry 6. An L-shaped carrier 5 is fixedly installed on the front side of the cutting seat 4. A push shaft 36 is rotatably installed through the end of the L-shaped carrier 5, which supports the push shaft 36. A push claw 37 extends from one end of the push shaft 36, and a push saw frame 34 is rotatably installed at the end of the push claw 37. The push saw frame 34 is connected to the gantry 6. The push shaft 36 drives the push claw 37 to rotate, thereby driving the push saw frame 34 to move and push the gantry 6. At this time, the slider 25 slides on the guide post 35 to guide the gantry 6, so that the gantry 6 can move up and down continuously. This, in turn, drives the circular saw blade 7 to move up and down continuously during cutting. After cutting a small part of the cross-shaped die steel forging 15, the circular saw blade 7 can move up and then down to cut the cross-shaped die steel forging 15. This cycle allows the circular saw blade 7 to be subjected to force intermittently, thereby reducing the continuous load time of the circular saw blade 7 and extending the service life of the circular saw blade 7. At the same time, when the circular saw blade 7 moves up, a cooling gap can be left for the circular saw blade 7 to avoid overheating, thereby further extending the service life of the circular saw blade 7.

[0030] A bearing shaft 28 is rotatably mounted on the upper rear part of the cutter 4. A threaded rod 9 is fixedly mounted on the inner top surface of the stand 2. The bearing shaft 28 serves as a transmission mechanism. The lower end of the threaded rod 9 is fixed to the cutter table 1. A threaded sleeve 3 is screwed onto the outer surface of the threaded rod 9. The threaded sleeve 3 is rotatably connected to the rear end of the cutter 4. The engagement between the threaded sleeve 3 and the threaded rod 9 can drive the cutter 4 to move downward. The threaded sleeve 3 is connected to the bearing shaft 28. A second servo motor 26 is fixedly mounted on the side rear part of the cutter 4. The bearing shaft 28 and the push shaft 36 are both connected to the second servo motor 26. The second servo motor 26 drives the bearing shaft 28 and the push shaft 36 to rotate.

[0031] The other end of the push shaft 36 and the outer surface of the output end of the second servo motor 26 are both coaxially inlaid with connecting pulleys 33. A second belt 32 is connected between the two connecting pulleys 33. The connecting pulleys 33 serve to connect the second belt 32, and the second belt 32 serves to connect the output end of the second servo motor 26 and the push shaft 36 together.

[0032] The output end of the second servo motor 26 and the upper end of the bearing shaft 28 are both coaxially inlaid with a second bevel gear 27. The two second bevel gears 27 mesh with each other and serve to connect the output end of the second servo motor 26 and the bearing shaft 28. A small pulley 29 is coaxially inlaid on the outer surface of the bearing shaft 28, and a large pulley 31 is coaxially inlaid on the upper part of the outer surface of the threaded sleeve 3. The large pulley 31 and the small pulley 29 serve to reduce speed. A first belt 30 is connected between the large pulley 31 and the small pulley 29. The first belt 30 serves to connect the bearing shaft 28 and the threaded sleeve 3 together.

[0033] A connecting seat 24 is fixedly installed at the upper middle part of the gantry 6, and the end of the push saw frame 34 is rotatably installed inside the connecting seat 24. The connecting seat 24 serves to facilitate the connection of the push saw frame 34 and the gantry 6 together.

[0034] During cutting, the cross-shaped die forging 15 is placed on the cross seat 17. At this time, the four support rings 10 will engage with the four ends of the cross-shaped die forging 15 to position it, aligning the center of the cross-shaped die forging 15 with the central axis 22. Then, the threaded column 8 is rotated to move the threaded ring 14 downward, which in turn moves the pressure plate 11 on the plate column 12 downward to press it against the cross-shaped die forging 15, thus fixing it in place. Then, the first servo motor 18 drives the central axis 22 to rotate, which in turn drives the circular saw blades 7 on the four saw shafts 20 to rotate synchronously through the gearbox 19. At the same time, the second servo motor 26 drives the bearing shaft 28 to rotate, which in turn drives the threaded sleeve 3 to rotate slowly, moving it slowly downward on the threaded rod 9, which in turn drives the cutting seat 4 to move slowly downward, allowing the four circular saw blades 7 arranged in a circular array around the central axis 22 on the cutting seat 4 to contact the cross-shaped die forging 15. The saw blade 7 cuts the four ends of the cross-shaped die forging 15 simultaneously, cutting them to equal length. During this process, the second servo motor 26 drives the pusher pawl 37 on the push shaft 36 to rotate, thereby driving the push saw frame 34 to move and push the gantry 6. At this time, the slider 25 slides on the guide post 35 to guide the gantry 6, allowing it to move up and down continuously. This, in turn, drives the circular saw blade 7 to move up and down continuously during cutting. After cutting a small area of ​​the cross-shaped die forging 15, the circular saw blade 7 can move upward and then downward to cut the cross-shaped die forging 15 again. This cycle allows the circular saw blade 7 to be subjected to intermittent force, reducing the continuous load time of the circular saw blade 7 and extending its service life. At the same time, when the circular saw blade 7 moves upward, a cooling gap is provided for the circular saw blade 7, preventing overheating and further extending its service life.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A die steel forging cutting device, comprising a cutting table (1), characterized in that: A moving saw is provided at the upper rear of the cutting table (1). A gantry (6) is connected to the moving saw. A four-jaw bracket (21) is fixedly installed at the lower end of the gantry (6). A gearbox (19) is fixedly installed on the inner side of the four-jaw bracket (21). A central shaft (22) is rotatably mounted through the middle of the upper end of the four-jaw bracket (21). The central shaft (22) is connected to the input end of the gearbox (19). Four saw shafts (20) are rotatably mounted in a circular array around the central shaft (22) at the end of the four-jaw bracket (21). The ends of the saw shafts (20) are connected to the output end of the gearbox (19). A circular saw blade (7) is coaxially fixed on the outer surface. A servo motor (18) is fixedly installed on the side of the gantry (6). A bevel gear (23) is coaxially embedded at the output end of the servo motor (18) and the upper end of the central shaft (22). The two bevel gears (23) mesh with each other. A cross seat (17) is fixedly installed at the front of the upper end of the cutting table (1). Four support rings (10) are fixedly installed in a ring array around the central shaft (22) at the upper end of the cross seat (17). A clamping part is installed at the lower end of the cross seat (17). The inner diameter of the support ring (10) is adapted to the end diameter of the cross-shaped die steel forging.

2. The die steel forging and cutting device according to claim 1, characterized in that: The clamping component includes a threaded post (8) rotatably mounted at the lower middle part of the cross seat (17). The lower end of the threaded post (8) is rotatably connected to the cutting table (1). A threaded ring (14) is screwed onto the upper part of the outer surface of the threaded post (8). A plate post (12) is fixedly mounted on the outer surface of the threaded ring (14). A pressure plate (11) is fixedly mounted on the upper end of the plate post (12). The pressure plate (11) is located above the cross seat (17).

3. The die steel forging and cutting device according to claim 2, characterized in that: A guide sleeve (13) is slidably installed on the outer surface of the plate column (12), and the guide sleeve (13) is fixed to the cross seat (17). A handwheel (16) is coaxially fixed on the lower part of the outer surface of the threaded column (8).

4. The die steel forging and cutting device according to claim 1, characterized in that: The moving saw includes a stand (2) fixedly installed at the upper rear of the cutting table (1). A cutting seat (4) is slidably installed at the front end of the stand (2). Two guide posts (35) are symmetrically fixedly installed at the front end of the cutting seat (4). A slider (25) is slidably installed on the outer surface of the two guide posts (35). The front end of the slider (25) is fixed to the rear end of the gantry (6). An L-shaped carrier (5) is fixedly installed on the front side of the cutting seat (4). A push shaft (36) is rotatably installed through the end of the L-shaped carrier (5). A push claw (37) extends from one end of the push shaft (36). A push saw frame (34) is rotatably installed at the end of the push claw (37). The push saw frame (34) is connected to the gantry (6).

5. The die steel forging and cutting device according to claim 4, characterized in that: The upper rear part of the cutting seat (4) is rotatably mounted with a bearing shaft (28). The inner top surface of the stand (2) is fixedly mounted with a threaded rod (9). The lower end of the threaded rod (9) is fixed to the cutting table (1). A threaded sleeve (3) is screwed onto the outer surface of the threaded rod (9). The threaded sleeve (3) is rotatably connected to the rear end of the cutting seat (4). The threaded sleeve (3) is connected to the bearing shaft (28). The side rear part of the cutting seat (4) is fixedly mounted with a second servo motor (26). The bearing shaft (28) and the push shaft (36) are both connected to the second servo motor (26).

6. The die steel forging and cutting device according to claim 5, characterized in that: The other end of the push shaft (36) and the outer surface of the output end of the second servo motor (26) are both coaxially inlaid with connecting pulleys (33), and a second belt (32) is connected between the two connecting pulleys (33).

7. The die steel forging and cutting device according to claim 5, characterized in that: The output end of the second servo motor (26) and the upper end of the bearing shaft (28) are both coaxially inlaid with a second bevel gear (27). The two second bevel gears (27) mesh with each other. The outer surface of the bearing shaft (28) is coaxially inlaid with a small pulley (29). The upper part of the outer surface of the threaded sleeve (3) is coaxially inlaid with a large pulley (31). A belt (30) is connected between the large pulley (31) and the small pulley (29).

8. The die steel forging and cutting device according to claim 4, characterized in that: A connecting seat (24) is fixedly installed at the middle of the upper end of the gantry (6), and the end of the push saw frame (34) is rotatably installed inside the connecting seat (24).