A local heating device for cutting metal parts
By designing a local heating and cutting device for thick-walled steel plates, a two-way cutting gun is used to achieve uniform heating and precise cutting of the steel plates, the problems of uneven preheating and low cutting accuracy in thermal cutting of thick-walled steel plates are solved, and the cutting quality and accuracy are improved.
Patent Information
- Application Number
- CN202510081253.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-04-01
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
During the thermal cutting of thick-walled steel plates, it is difficult to achieve uniform preheating of the steel plates, resulting in poor cutting quality, especially when cutting special-shaped parts, the size error is large, which affects subsequent processing.
A local heating device for cutting metal parts is designed. The first cutting gun and the second cutting gun are arranged through the fixed frame and the moving frame on the lathe base, which are located above and below the steel plate respectively, so as to realize bidirectional local heating and precise cutting of the steel plate.
This device can effectively preheat the steel plate, reduce cutting stress and deformation, improve cutting accuracy, and reduce the dimensional error of the workpiece after cutting. It is suitable for cutting special-shaped parts.
Smart Images
Figure CN119733921A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of thermal cutting of thick-walled steel materials, and in particular to a local heating device for cutting metal parts. Background Art
[0002] It is well known that when hot cutting is performed on thick-walled steel plates, the thick-walled steel plates need to be preheated to reduce stress and deformation during cutting and prevent cracking at the incision in the later stage. When cutting thick-walled steel plates, workers usually only preheat the upper surface of the thick-walled steel plates. Due to the position of the steel plates, it is difficult to preheat the initial processing side and lower surface of the thick-walled steel plates. When it is necessary to cut out special-shaped parts, if the thick-walled steel plates are preheated but the preheating standard temperature is not reached during hot cutting, the quality of the cut workpiece will be affected. In addition, when the workpiece is taken out by hot cutting, when the cutting gun head cuts along the tangent on the thick-walled steel plate, the incision of the usual cutting gun head will melt along the tangent to the workpiece and the thick-walled steel plate during cutting, thereby affecting the accuracy of the cut workpiece, especially when cutting special-shaped parts, there will be a huge error between the cut workpiece and the original size, further affecting the subsequent processing of special-shaped parts. For this reason, we propose a local heating device for cutting metal parts. Summary of the invention
[0003] In order to overcome the shortcomings of the background technology, the present invention discloses a local heating device for cutting metal parts. When in use, a fixed frame is arranged on the lathe base, a first cutting gun mounting base and a second cutting gun are arranged on the movable frame, and a first cutting gun is arranged on the first cutting gun mounting base, so as to achieve the purpose of accurately cutting the rear wall steel by the cooperation of the first cutting gun and the second cutting gun.
[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: A local heating device for cutting metal parts comprises a moving frame, a lathe base, a first cutting gun, a second cutting gun and a first cutting gun mounting base. The moving frame is provided on the lathe base, the first cutting gun mounting base and the second cutting gun are provided on the moving frame, the first cutting gun is provided on the first cutting gun mounting base, the first cutting gun is located above the rear wall steel, and the second cutting gun is located below the rear wall steel. The rear wall steel is precisely cut by the cooperation of the first cutting gun and the second cutting gun.
[0005] The lathe base is composed of a base plate, a fixed frame and a first fixed column. A support plate is provided on the upper surface of the base plate. The support plate is vertically arranged with the base plate. At least one support plate is provided, and the support plates are arranged in order on the base plate. A slide rail is provided on the side wall of the base plate. A fixed frame is provided in the slide rail on the base plate. A slideway is provided on the fixed frame. The fixed frame is movably connected to the base plate by being clamped in the slide rail on the base plate through the slideway. A first fixed column is provided on the fixed frame. The first fixed columns are arranged in pairs. Teeth are provided on the outer wall of the first fixed column. A movable frame is provided on the first fixed column.
[0006] The movable frame is composed of a fixing device and a first fixing block. The first fixing block is a "U"-shaped structure. A fixing device is provided on one end of the first fixing block. A second cutting gun is provided on the other end of the first fixing block. A sixth fixing hole is provided on the end of the first fixing block where the second cutting gun is provided. The sixth fixing hole passes through the first fixing block.
[0007] The fixing device is composed of a second fixing block, a servo motor and a gear. One end of the second fixing block is connected to the first fixing block. A fourth fixing hole is provided on the upper surface of the second fixing block. The fourth fixing hole penetrates the second fixing block. A first cutting gun mounting base is provided in the fourth fixing hole on the second fixing block. A third fixing hole is provided on the front surface of the second fixing block. The third fixing hole penetrates the second fixing block. The third fixing holes on the second fixing block are arranged in pairs. The second fixing block is sleeved on the first fixing column through the third fixing hole. A servo motor is provided inside the second fixing block. A gear is provided on the transmission shaft of the servo motor. The gear is meshed with teeth on the first fixing column.
[0008] The second cutting gun is composed of a third fixed block, a fourth fixed block and a heating gun head. A fourth fixed block is provided on one end of the third fixed block. The fourth fixed blocks are arranged in pairs. A heating gun head is provided on the upper surface of the fourth fixed block. The heating gun head is inclined on the fourth fixed block. At least one heating gun head is provided. The heating gun heads are arranged in an orderly manner on the fourth fixed block. A fifth fixing hole is provided on the third fixed block. The fifth fixing hole on the third fixed block is connected to the heating gun head. The fifth fixing hole on the third fixed block is connected to the sixth fixing hole on the first fixed block.
[0009] The first cutting gun mounting base is composed of a fourth fixing column, a second fixing tube and a first fixing tube, a seventh fixing hole and an eighth fixing hole are respectively provided on the upper surface of the fourth fixing column, the seventh fixing hole and the eighth fixing hole both penetrate the fourth fixing column, a first fixing tube is provided in the seventh fixing hole on the fourth fixing column, a second fixing tube is provided in the eighth fixing hole on the fourth fixing column, a first groove is provided in the middle position of the lower surface of the fourth fixing column, a second groove is provided inside the fourth fixing column at the bottom position of the first groove, and a first cutting gun is provided in the first groove on the fourth fixing column.
[0010] The first cutting gun is composed of a third fixed tube, a second fixed column, a first cutting head and a second cutting head. The second fixed column is a frustum-shaped structure. The upper surface diameter of the second fixed column is larger than the lower surface diameter. A third fixed tube is arranged on the upper surface of the second fixed column. One end of the third fixed tube is connected to the second fixed column. A limiting ring is arranged on the outer wall of the other end of the third fixed tube. The third fixed tube is arranged in the first groove on the fourth fixed column. The limiting ring is arranged in the second groove on the fourth fixed column. The second fixed column is movably connected in the first groove on the fourth fixed column through the third fixed tube. A first fixing hole and a second fixing hole are respectively arranged on the lower surface of the second fixed column. The first fixing hole and the second fixing hole both pass through the second fixed column. A first cutting head is arranged in the first fixing hole on the second fixed column. A second cutting head is arranged in the second fixing hole on the second fixed column. A fixing rod is arranged on the outer wall of the second fixed column.
[0011] The first cutting head is provided with a first connecting tube, which is made of a soft material. One end of the first connecting tube is connected to the first cutting head, and the other end of the first connecting tube is connected to the first fixed tube. The second cutting head is provided with a second connecting tube, which is made of a soft material. One end of the second connecting tube is connected to the second cutting head, and the other end of the second connecting tube is connected to the second fixed tube.
[0012] The first cutting gun is composed of a third fixed column, a third fixed tube and a third cutting head. The third fixed column is a frustum-shaped structure. The upper surface diameter of the third fixed column is larger than the lower surface diameter. A third fixed tube is provided on the upper surface of the third fixed column. One end of the third fixed tube is connected to the third fixed column. A limiting ring is provided on the outer wall of the other end of the third fixed tube. The third fixed tube is arranged in a first groove on the fourth fixed column. The limiting ring is arranged in a second groove on the fourth fixed column. The third fixed column is movably connected in the first groove on the fourth fixed column through the third fixed tube. A third cutting head is provided on the lower surface of the third fixed column. A partition is provided in the third cutting head. The partition separates the third cutting head into two independent spaces. The two independent spaces on the inner wall of the third cutting head are respectively connected with the first connecting tube and the second connecting tube.
[0013] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: The local heating device for cutting metal parts described in the present invention is characterized in that, when in use, a fixed frame is arranged on a lathe base, a first cutting gun mounting base and a second cutting gun are arranged on a movable frame, and a first cutting gun is arranged on the first cutting gun mounting base, so as to achieve the purpose of accurately cutting the rear wall steel by the cooperation of the first cutting gun and the second cutting gun; the present invention has a reasonable and practical structure and is easy to operate. It is not only convenient to preheat the part of the rear wall steel to be cut to prevent the workpiece from cracking after cutting, but also convenient to cut the rear wall steel, thereby improving the accuracy of cutting the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the first cutting gun mounting base structure of the present invention; Figure 3 It is a structural schematic diagram of a first embodiment of a first cutting gun of the present invention; Figure 4 It is a structural schematic diagram of a second embodiment of the first cutting gun of the present invention; Figure 5 It is a schematic diagram of the structure of the mobile rack of the present invention; Figure 6 It is a schematic diagram of the structure of the fixing device of the present invention; Figure 7 It is a schematic structural diagram of a second cutting gun of the present invention; 1. Mobile frame; 2. Bottom plate; 3. Fixed frame; 4. Lathe base; 5. First fixed column; 6. First cutting gun; 7. First cutting gun mounting base; 8. Second fixed pipe; 9. First fixed pipe; 10. Second groove; 11. First groove; 12. Limiting ring; 13. Third fixed pipe; 14. Fixed rod; 15. First connecting pipe; 16. Second connecting pipe; 17. Second fixed column; 18. Second fixing hole; 19. First fixing hole; 20. First cutting head; 21. Second Cutting head; 22. third fixing column; 23. third cutting head; 24. partition; 25. first fixing block; 26. fixing device; 27. second cutting gun; 28. second fixing block; 29. third fixing hole; 30. fourth fixing hole; 31. servo motor; 32. gear; 33. third fixing block; 34. fourth fixing block; 35. fifth fixing hole; 36. heating gun head; 37. sixth fixing hole; 38. fourth fixing column; 39. seventh fixing hole; 40. eighth fixing hole. DETAILED DESCRIPTION
[0015] The present invention can be explained in detail by the following examples, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.
[0016] Combined with Figures 1 to 7 A local heating device for cutting metal parts comprises a moving frame 1, a lathe base 4, a first cutting gun 6, a second cutting gun 27 and a first cutting gun mounting base 7. The moving frame 1 is provided on the lathe base 4, the first cutting gun mounting base 7 and the second cutting gun 27 are provided on the moving frame 1, the first cutting gun 6 is provided on the first cutting gun mounting base 7, the first cutting gun 6 is located above the rear wall steel, and the second cutting gun 27 is located below the rear wall steel. The rear wall steel is precisely cut by the cooperation of the first cutting gun 6 and the second cutting gun 27.
[0017] The lathe base 4 is composed of a base plate 2, a fixed frame 3 and a first fixed column 5. A support plate is provided on the upper surface of the base plate 2. The support plate is vertically arranged with the base plate 2. At least one support plate is provided, and the support plates are arranged in order on the base plate 2. A slide rail is provided on the side wall of the base plate 2. A fixed frame 3 is provided in the slide rail on the base plate 2. A slideway is provided on the fixed frame 3. The fixed frame 3 is movably connected to the base plate 2 by being clamped in the slide rail on the base plate 2 through the slideway. A first fixed column 5 is provided on the fixed frame 3. The first fixed column 5 is arranged in pairs. Teeth are provided on the outer wall of the first fixed column 5. A movable frame 1 is provided on the first fixed column 5.
[0018] The mobile frame 1 is composed of a fixing device 26 and a first fixing block 25. The first fixing block 25 is a "U"-shaped structure. The fixing device 26 is provided on one end of the first fixing block 25, and the second cutting gun 27 is provided on the other end of the first fixing block 25. The first fixing block 25 is provided with a sixth fixing hole 37 on the end where the second cutting gun 27 is provided, and the sixth fixing hole 37 passes through the first fixing block 25.
[0019] The fixing device 26 is composed of a second fixing block 28, a servo motor 31 and a gear 32. One end of the second fixing block 28 is connected to the first fixing block 25. A fourth fixing hole 30 is provided on the upper surface of the second fixing block 28. The fourth fixing hole 30 penetrates the second fixing block 28. A first cutting gun mounting base 7 is provided in the fourth fixing hole 30 on the second fixing block 28. A third fixing hole 29 is provided on the front surface of the second fixing block 28. The third fixing hole 29 penetrates the second fixing block 28. The third fixing holes 29 on the second fixing block 28 are arranged in pairs. The second fixing block 28 is sleeved on the first fixing column 5 through the third fixing hole 29. A servo motor 31 is provided inside the second fixing block 28. A gear 32 is provided on the transmission shaft of the servo motor 31. The gear 32 meshes with the teeth on the first fixing column 5.
[0020] The second cutting gun 27 is composed of a third fixed block 33, a fourth fixed block 34 and a heating gun head 36. The fourth fixed block 34 is provided on one end of the third fixed block 33. The fourth fixed blocks 34 are arranged in pairs. A heating gun head 36 is provided on the upper surface of the fourth fixed block 34. The heating gun head 36 is inclined on the fourth fixed block 34. At least one heating gun head 36 is provided. The heating gun heads 36 are arranged in an orderly manner on the fourth fixed block 34. A fifth fixing hole 35 is provided on the third fixed block 33. The fifth fixing hole 35 on the third fixed block 33 is connected to the heating gun head 36. The fifth fixing hole 35 on the third fixed block 33 is connected to the sixth fixing hole 37 on the first fixed block 25.
[0021] The first cutting gun mounting base 7 is composed of a fourth fixing column 38, a second fixing tube 8 and a first fixing tube 9. A seventh fixing hole 39 and an eighth fixing hole 40 are respectively provided on the upper surface of the fourth fixing column 38. The seventh fixing hole 39 and the eighth fixing hole 40 both penetrate the fourth fixing column 38. The first fixing tube 9 is provided in the seventh fixing hole 39 on the fourth fixing column 38. The second fixing tube 8 is provided in the eighth fixing hole 40 on the fourth fixing column 38. A first groove 11 is provided in the middle position of the lower surface of the fourth fixing column 38. A second groove 10 is provided inside the fourth fixing column 38 at the bottom position of the first groove 11. The first cutting gun 6 is provided in the first groove 11 on the fourth fixing column 38.
[0022] The first cutting gun 6 is composed of a third fixed tube 13, a second fixed column 17, a first cutting head 20 and a second cutting head 21. The second fixed column 17 is a frustum-shaped structure. The upper surface diameter of the second fixed column 17 is larger than the lower surface diameter. The upper surface of the second fixed column 17 is provided with a third fixed tube 13. One end of the third fixed tube 13 is connected to the second fixed column 17. A limiting ring 12 is provided on the outer wall of the other end of the third fixed tube 13. The third fixed tube 13 is arranged in the first groove 11 on the fourth fixed column 38. The limiting ring 12 is arranged on the fourth fixed column 38, the second fixing column 17 is inserted into the first groove 11 on the fourth fixing column 38 through the third fixing tube 13 and is movably connected, the lower surface of the second fixing column 17 is respectively provided with a first fixing hole 19 and a second fixing hole 18, the first fixing hole 19 and the second fixing hole 18 both penetrate the second fixing column 17, the first fixing hole 19 of the second fixing column 17 is provided with a first cutting head 20, the second fixing hole 18 of the second fixing column 17 is provided with a second cutting head 21, and a fixing rod 14 is provided on the outer wall of the second fixing column 17.
[0023] The first cutting head 20 is provided with a first connecting tube 15, which is made of a soft material. One end of the first connecting tube 15 is connected to the first cutting head 20, and the other end of the first connecting tube 15 is connected to the first fixed tube 9. The second cutting head 21 is provided with a second connecting tube 16, which is made of a soft material. One end of the second connecting tube 16 is connected to the second cutting head 21, and the other end of the second connecting tube 16 is connected to the second fixed tube 8.
[0024] The first cutting gun 6 is composed of a third fixed column 22, a third fixed tube 13 and a third cutting head 23. The third fixed column 22 is a frustum-shaped structure. The upper surface diameter of the third fixed column 22 is larger than the lower surface diameter. The third fixed tube 13 is provided on the upper surface of the third fixed column 22. One end of the third fixed tube 13 is connected to the third fixed column 22. A limiting ring 12 is provided on the outer wall of the other end of the third fixed tube 13. The third fixed tube 13 is arranged in the first groove 11 on the fourth fixed column 38. The limiting ring 12 is arranged in the second groove 10 on the fourth fixed column 38. The third fixed column 22 is movably connected in the first groove 11 on the fourth fixed column 38 through the third fixed tube 13. The third cutting head 23 is provided on the lower surface of the third fixed column 22. A partition 24 is provided in the third cutting head 23. The partition 24 isolates the third cutting head 23 into two independent spaces. The two independent spaces on the inner wall of the third cutting head 23 are respectively connected with the first connecting tube 15 and the second connecting tube 16.
[0025] Embodiment 1, a local heating device for cutting metal parts, when in use, the rear wall steel to be cut is placed on the bottom plate 2, the rear wall steel on the bottom plate 2 is supported by a support plate, the fixing frame 3 is installed on the bottom plate 2, the fixing frame 3 is movably connected to the bottom plate 2 by being clamped in the slide rail on the bottom plate 2 by a slideway, the fixing device 26 is installed on the first fixing column 5, the second cutting gun 27 is fixed to the fixing device 26 by the first fixing block 25, the oxygen pipe and the gas pipe on the first cutting head 20 are connected to the oxygen storage device and the gas storage device through the first connecting pipe 15 and the first fixed pipe 9, the oxygen pipe and the gas pipe on the second cutting head 21 are connected to the oxygen storage device and the gas storage device through the second connecting pipe 16 and the second fixed pipe 8, the oxygen pipe and the gas pipe of the heating gun head 36 are connected to the oxygen storage device and the gas storage device through the third fixing block 33 The fifth fixing hole 35 passes through the sixth fixing hole 37 on the first fixing block 25. When cutting the rear wall steel, the position to be cut on the upper surface of the rear wall steel is preheated by the first cutting head 20 and the second cutting head 21, and the lower surface of the rear wall steel is preheated by the heating gun head 36. Then, the oxygen and fuel gas supply on the first cutting head 20 and the second cutting head 21 are adjusted respectively. The first cutting head 20 and the second cutting head 21 are arranged side by side, the second cutting head 21 is close to the side of the workpiece being cut, and the first cutting head 20 is close to the side of the steel. The temperature of the first cutting head 20 is higher than that of the second cutting head 21 when cutting. When cutting to a corner, the second fixing column 17 is pushed to rotate by the fixing rod 14, so that the first cutting head 20 is always close to one side of the steel, thereby improving the accuracy of cutting the workpiece.
[0026] Embodiment 2, a local heating device for cutting metal parts, when in use, the third fixed column 22 is installed on the fourth fixed column 38 through the third fixed tube 13, the partition 24 separates the third cutting head 23 into two independent spaces, the two independent spaces on the inner wall of the third cutting head 23 are respectively connected with the first connecting tube 15 and the second connecting tube 16, the third cutting head 23 sprays out two flames, the temperature of the flame on the side close to the workpiece being cut is lower than the temperature of the flame on the side close to the steel, when cutting to the corner, the third fixed column 22 is pushed to rotate by the fixed rod 14, so that the third cutting head 23 sprays out two flames with low temperature and keeps close to the workpiece being cut; the present invention has reasonable and practical structure and simple operation, which is not only convenient for preheating the part of the rear wall steel to be cut to prevent the workpiece from cracking after cutting, but also convenient for cutting the rear wall steel, thereby improving the accuracy of cutting the workpiece.
[0027] The parts of the present invention that are not described in detail are prior art. Although the present invention is specifically demonstrated and introduced in conjunction with the preferred implementation scheme, there are many methods and approaches to specifically implement the technical solution. The above is only a preferred implementation scheme of the present invention, but technical personnel in the relevant field should understand that various changes can be made to the present invention in form and details without departing from the spirit and scope of the present invention defined by the attached claims, which are all within the scope of protection of the present invention.
Claims
1. A local heating device for metal part cutting, comprising a moving frame, a lathe base, a first cutting gun, a second cutting gun and a first cutting gun mounting base, wherein the moving frame is provided on the lathe base, the first cutting gun mounting base and the second cutting gun are provided on the moving frame, and the first cutting gun mounting base is provided on the first cutting gun, wherein the first cutting gun is provided on the first cutting gun mounting base ... The first cutting gun is located above the rear wall steel, and the second cutting gun is located below the rear wall steel. The rear wall steel is precisely cut by the cooperation of the first cutting gun and the second cutting gun.
2. A local heating device for metal part cutting according to claim 1, characterized in that: The lathe base is composed of a base plate, a fixed frame and a first fixed column. A support plate is provided on the upper surface of the base plate. The support plate is vertically arranged with the base plate. At least one support plate is provided, and the support plates are arranged in order on the base plate. A slide rail is provided on the side wall of the base plate. A fixed frame is provided in the slide rail on the base plate. A slideway is provided on the fixed frame. The fixed frame is movably connected to the base plate by being clamped in the slide rail on the base plate through the slideway. A first fixed column is provided on the fixed frame. The first fixed columns are arranged in pairs. Teeth are provided on the outer wall of the first fixed column. A movable frame is provided on the first fixed column.
3. A local heating device for metal cutting according to claim 2, characterized in that: The movable frame is composed of a fixing device and a first fixing block. The first fixing block is a "U"-shaped structure. A fixing device is provided on one end of the first fixing block. A second cutting gun is provided on the other end of the first fixing block. A sixth fixing hole is provided on the end of the first fixing block where the second cutting gun is provided. The sixth fixing hole passes through the first fixing block.
4. A local heating device for metal cutting according to claim 3, characterized in that: The fixing device is composed of a second fixing block, a servo motor and a gear. One end of the second fixing block is connected to the first fixing block. A fourth fixing hole is provided on the upper surface of the second fixing block. The fourth fixing hole penetrates the second fixing block. A first cutting gun mounting base is provided in the fourth fixing hole on the second fixing block. A third fixing hole is provided on the front surface of the second fixing block. The third fixing hole penetrates the second fixing block. The third fixing holes on the second fixing block are arranged in pairs. The second fixing block is sleeved on the first fixing column through the third fixing hole. A servo motor is provided inside the second fixing block. A gear is provided on the transmission shaft of the servo motor. The gear is meshed with teeth on the first fixing column.
5. A local heating device for metal cutting according to any one of claims 1 to 4, characterized in that: The second cutting gun is composed of a third fixed block, a fourth fixed block and a heating gun head. A fourth fixed block is provided on one end of the third fixed block. The fourth fixed blocks are arranged in pairs. A heating gun head is provided on the upper surface of the fourth fixed block. The heating gun head is inclined on the fourth fixed block. At least one heating gun head is provided. The heating gun heads are arranged in an orderly manner on the fourth fixed block. A fifth fixing hole is provided on the third fixed block. The fifth fixing hole on the third fixed block is connected to the heating gun head. The fifth fixing hole on the third fixed block is connected to the sixth fixing hole on the first fixed block.
6. A local heating device for metal cutting according to any one of claims 1 to 5, characterized in that: The first cutting gun mounting base is composed of a fourth fixing column, a second fixing tube and a first fixing tube, a seventh fixing hole and an eighth fixing hole are respectively provided on the upper surface of the fourth fixing column, the seventh fixing hole and the eighth fixing hole both penetrate the fourth fixing column, a first fixing tube is provided in the seventh fixing hole on the fourth fixing column, a second fixing tube is provided in the eighth fixing hole on the fourth fixing column, a first groove is provided in the middle position of the lower surface of the fourth fixing column, a second groove is provided inside the fourth fixing column at the bottom position of the first groove, and a first cutting gun is provided in the first groove on the fourth fixing column.
7. A local heating device for metal part cutting according to any one of claims 1 to 6, characterized in that: The first cutting gun is composed of a third fixed tube, a second fixed column, a first cutting head and a second cutting head. The second fixed column is a frustum-shaped structure. The upper surface diameter of the second fixed column is larger than the lower surface diameter. A third fixed tube is arranged on the upper surface of the second fixed column. One end of the third fixed tube is connected to the second fixed column. A limiting ring is arranged on the outer wall of the other end of the third fixed tube. The third fixed tube is arranged in the first groove on the fourth fixed column. The limiting ring is arranged in the second groove on the fourth fixed column. The second fixed column is movably connected in the first groove on the fourth fixed column through the third fixed tube. A first fixing hole and a second fixing hole are respectively arranged on the lower surface of the second fixed column. The first fixing hole and the second fixing hole both pass through the second fixed column. A first cutting head is arranged in the first fixing hole on the second fixed column. A second cutting head is arranged in the second fixing hole on the second fixed column. A fixing rod is arranged on the outer wall of the second fixed column.
8. A local heating device for metal part cutting according to any one of claims 1 to 7, characterized in that: The first cutting head is provided with a first connecting tube, which is made of a soft material. One end of the first connecting tube is connected to the first cutting head, and the other end of the first connecting tube is connected to the first fixed tube. The second cutting head is provided with a second connecting tube, which is made of a soft material. One end of the second connecting tube is connected to the second cutting head, and the other end of the second connecting tube is connected to the second fixed tube.
9. A local heating device for metal cutting according to any one of claims 1 to 8, characterized in that: The first cutting gun is composed of a third fixed column, a third fixed tube and a third cutting head. The third fixed column is a frustum-shaped structure. The upper surface diameter of the third fixed column is larger than the lower surface diameter. A third fixed tube is provided on the upper surface of the third fixed column. One end of the third fixed tube is connected to the third fixed column. A limiting ring is provided on the outer wall of the other end of the third fixed tube. The third fixed tube is arranged in a first groove on the fourth fixed column. The limiting ring is arranged in a second groove on the fourth fixed column. The third fixed column is movably connected in the first groove on the fourth fixed column through the third fixed tube. A third cutting head is provided on the lower surface of the third fixed column. A partition is provided in the third cutting head. The partition separates the third cutting head into two independent spaces. The two independent spaces on the inner wall of the third cutting head are respectively connected with the first connecting tube and the second connecting tube.