Metal surface heat treatment device and treatment method

Abstract

The present invention is applicable to the technical field of metal surface heat treatment, and the present invention discloses a metal surface heat treatment device and a treatment method, wherein a metal surface heat treatment device comprises a shell, the inner end surface of the shell is slidably connected to a sliding frame, a No. 1 driving member is connected between the sliding frame and the shell, a positioning hole is provided on the sliding frame, the inner wall of the positioning hole is universally connected to a plurality of balls, and electric heating sleeves are passed through both sides of the positioning hole; the inner side surface of the shell is horizontally slidably connected to a support frame, and the support frame is connected to a power mechanism. The metal surface heat treatment device provided by the present invention can quickly push the magnetic block to the magnet at one end of the metal tube and sleeve through the rapid push of the sliding sleeve, thereby improving the instantaneous pushing speed of the metal tube and sleeve, and avoiding the long-term contact of the coating layer on the surface of the metal tube and sleeve with the surface of the ball at high temperature to produce adhesion.

Description

Technical Field

[0001] The present invention specifically relates to the technical field of metal surface heat treatment, and in particular to a metal surface heat treatment device and a treatment method. Background Art

[0002] Metal surface heat treatment is a metal heat treatment process that changes the surface structure of the workpiece by heating and then cooling it to obtain the desired performance. Surface heat treatment of steel parts can obtain a high-hardness martensitic structure on the surface, retain the toughness and plasticity of the core, and improve the comprehensive mechanical properties of the workpiece. For some pipe or shaft parts, surface heat treatment can be used to make the surface have a higher wear resistance, greatly improving the overall fatigue resistance of the workpiece. In the heat treatment of the metal surface of pipes or shafts, for some metals that are not convenient to be directly exposed to the air for heat treatment, a coating layer needs to be applied on the metal surface.

[0003] A surface heat treatment device for a metal tube with the existing publication number CN113621781B performs intermittent feeding of the metal tube in a non-clamping manner, and heats the bottom and side walls of the metal tube through the arranged heating blocks and heating plates. The friction generated when the metal tube is fed, and the friction generated when the damping block arranged on the upper surface of the heating block makes axial movement of the metal tube, can further improve the quality and efficiency of the heat treatment by utilizing the heat generated by multiple frictions.

[0004] When heating existing metal tubes or metal shafts, the metal tubes or metal shafts are usually fixed by clamping. This method not only affects the heating of the clamping parts, but also easily causes damage to the coating layer under the action of the clamping force. In the above scheme, the metal tube is intermittently fed in a non-clamping manner to avoid the adverse effects caused by uneven heating of each section. However, during heating, there are gaps between multiple heating blocks, which easily affect the uniform heating of the metal tube. At the same time, the heat generated by the friction generated by the two heating plates when feeding the metal tube and the friction generated by the damping block when the metal tube moves axially is used to improve the heating efficiency. The heat generated by this method is extremely limited, and the surface coating layer is easily damaged during heating. Summary of the invention

[0005] The purpose of the present invention is to provide a metal surface heat treatment device and a treatment method to address the deficiencies of the prior art, thereby ensuring that the metal tube or metal shaft is evenly heated while preventing the coating layer on the surface of the metal tube or metal shaft from being damaged.

[0006] The present invention is implemented in this way. A metal surface heat treatment device comprises a shell, an inner end surface of the shell is slidably connected to a sliding frame, a retractable driving No. 1 driving member is connected between the sliding frame and the shell, a positioning hole is provided on the sliding frame, the inner wall of the positioning hole is universally connected to a plurality of balls, and electric heating sleeves are passed through both sides of the positioning hole; a support frame is horizontally slidably connected to the inner side surface of the shell, the support frame is connected to a power mechanism, and the power mechanism can push the support frame to reciprocate and slide horizontally, both ends of the support frame are rotatably connected to a rotating rod, the rotating rod is slidably connected to a sliding sleeve, the sliding sleeve and the rotating rod are connected by a spring, a transmission component is connected between the sliding sleeve and the power mechanism, and the transmission component can drive the sliding sleeve to rotate continuously;

[0007] The sliding sleeve is fixedly connected with a guide member, and the support frame is fixedly connected with a thrust member, and the thrust member can abut against the guide member;

[0008] The end surface of the sleeve is fixedly connected with a No. 2 driving member, and one end of the No. 2 driving member is fixedly connected with a magnetic block. When heated, magnets are adsorbed on both ends of the metal tube or metal shaft, and the surface magnetic poles of the magnet and the magnetic block are opposite.

[0009] According to a further technical solution, the magnetic block is provided with a raised inclined surface, and the magnet and the magnetic block have the same shape.

[0010] According to a further technical solution, the guide member is a toothed seat, the thrust member is a rod body, and the rod body is arranged on a circular motion trajectory of the toothed seat.

[0011] According to a further technical solution, the power mechanism includes an AC motor and a rotating shaft, wherein the AC motor is fixedly connected to the inner end surface of the housing, the rotating shaft is fixedly connected to the output shaft of the AC motor, and the support frame is threadedly connected to the rotating shaft.

[0012] According to a further technical solution, the transmission assembly includes a gear sleeve and a gear ring, wherein the gear sleeve is rotatably connected to the support frame and slidably connected along the rotating shaft, the gear ring is fixedly connected to the sliding sleeve, and the gear sleeve is meshed with the gear ring.

[0013] According to a further technical solution, the inner cavity of the electric heating jacket is circular.

[0014] According to a further technical solution, the outer wall of the magnetic block is circular and fits the inner cavity of the electric heating jacket.

[0015] According to a further technical solution, the first driving component and the second driving component are electrically driven.

[0016] A metal surface heat treatment method, applied to the metal surface heat treatment device described above, comprises the following steps:

[0017] S1: The No. 1 driving member is extended, and the sliding frame is pushed by the No. 1 driving member. The sliding frame and the electric heating jacket are pushed to the outside of the housing, and the two ends of the metal tube and the shaft are attracted to the magnets by magnetic force. Then, the metal tube and the shaft are placed in the electric heating jacket, and the metal tube and the shaft are positioned by the ball in the positioning hole;

[0018] S2: The first driving member shortens and moves the sliding frame together with the electric heating jacket to the inside of the housing. At this time, the second driving member extends and drives the magnetic block connected to its end to extend into the electric heating jacket.

[0019] S3: Turn on the electric heating jacket to heat the metal tube and the jacket, start the power mechanism, the power mechanism pushes the support frame to slide back and forth horizontally, the support frame drives the magnetic blocks at both ends to move back and forth horizontally in the electric heating jacket, and the metal tube and the shaft move back and forth horizontally in the electric heating jacket under the magnetic force of the magnetic blocks;

[0020] S4: Driven by the power mechanism, the transmission assembly drives the sleeve to rotate continuously, and the sleeve drives the guide member to move synchronously. When the guide member contacts the thrust member, the guide member drives the sleeve to slide relative to the rotating rod. When the No. 2 driving member drives the magnetic block to approach one side of the metal tube and sleeve, the magnetic block is quickly pushed out of the sleeve to quickly approach the magnet at one end of the metal tube and sleeve.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] The present invention provides a metal surface heat treatment device. When the second driving member drives the magnetic block to approach one side of the metal tube and sleeve, the sliding sleeve is quickly pushed out to quickly push the magnetic block to approach the magnet at one end of the metal tube and sleeve, thereby increasing the instantaneous pushing speed of the metal tube and sleeve, thereby increasing the moving speed of the metal tube sleeve in the electric heating sleeve, and avoiding the contact between the surface of the metal tube and sleeve and the coating layer on the surface of the ball at the same position for a long time under high temperature to cause adhesion.

[0023] The present invention provides a metal surface heat treatment device, in which a magnetic block pushes a metal tube and a shaft to reciprocate in an electric heating sleeve, thereby preventing a single support of the metal tube and sleeve by a ball bearing affects the heating of the supporting part of the metal tube and sleeve, thereby increasing the heating uniformity of the metal tube and sleeve; at the same time, when the metal tube and sleeve move, the ball bearings roll synchronously, thereby preventing the metal tube and sleeve from sliding back and forth with the supporting part and causing the coating layer on the metal surface to fall off; further, the cooperation of the magnetic block with the magnets at both ends of the metal tube and sleeve can push the metal tube and sleeve without contact, thereby further improving the heating uniformity of the metal tube and sleeve;

[0024] The present invention provides a metal surface heat treatment device, wherein the magnetic block is provided with a raised inclined surface, and the magnet and the magnetic block have the same shape; when the magnetic block rotates, the inclined surface of the magnetic block is close to the inclined surface of the magnet. At this time, under the action of the magnetic thrust, the magnet pushes the metal pipe and the sleeve to move horizontally, while the metal pipe and the sleeve produce spiral rotation, which can avoid uneven local heating of the electric heating sleeve, causing uneven heating of the metal pipe and the sleeve, and increase the heating uniformity of the metal pipe and the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a connection diagram of the power mechanism and the transmission assembly;

[0027] Figure 3 It is a schematic diagram of the connection between the transmission component and the sleeve;

[0028] Figure 4 It is a schematic diagram of the matching of the guide member and the thrust member;

[0029] Figure 5 It is a schematic diagram of the connection between the sliding frame and the electric heating jacket;

[0030] Figure 6 Schematic diagram of the connection between the positioning hole and the ball.

[0031] In the attached drawings: 1. outer shell; 2. sliding frame; 3. electric heating sleeve; 4. driving member No. 1; 5. positioning hole; 6. ball bearing; 7. magnetic block; 8. power mechanism; 81. AC motor; 82. rotating shaft; 9. transmission assembly; 91. gear sleeve; 92. gear ring; 10. rotating rod; 11. sliding sleeve; 12. supporting frame; 13. guide member; 14. thrust member; 15. driving member No. 2. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0034] like Figure 1-Figure 6As shown, a metal surface heat treatment device provided by the present invention comprises a shell 1, a sliding frame 2 is slidably connected to the inner end surface of the shell 1, a retractably driven No. 1 driving member 4 is connected between the sliding frame 2 and the shell 1, a positioning hole 5 is provided on the sliding frame 2, a plurality of balls 6 are universally connected to the inner wall of the positioning hole 5, and electric heating sleeves 3 are passed through both sides of the positioning hole 5; a support frame 12 is horizontally slidably connected to the inner side surface of the shell 1, the support frame 12 is connected to a power mechanism 8, and the power mechanism 8 can push the support frame 12 to slide reciprocatingly horizontally, and both ends of the support frame 12 are rotatably connected to a rotating rod 10, and the rotating rod 10 is slidably connected to a sliding sleeve 11, and the sliding sleeve 11 is connected to the rotating rod 10 by a spring, and a transmission component 9 is connected between the sliding sleeve 11 and the power mechanism 8, and the transmission component 9 can drive the sliding sleeve 11 to rotate continuously;

[0035] The sliding sleeve 11 is fixedly connected with a guide member 13, and the support frame 12 is fixedly connected with a thrust member 14, and the thrust member 14 can abut against the guide member 13;

[0036] The end surface of the sleeve 11 is fixedly connected with a No. 2 driving member 15, and one end of the No. 2 driving member 15 is fixedly connected with a magnetic block 7. When heated, magnets are adsorbed on both ends of the metal tube or metal shaft, and the surface magnetic poles of the magnet and the magnetic block 7 are opposite.

[0037] In the above scheme, the first driving member 4 is extended, and the sliding frame 2 is pushed by the first driving member 4, and the sliding frame 2 together with the electric heating jacket 3 is pushed to the outside of the housing 1, and the two ends of the metal tube and the shaft are attracted to the magnet by magnetic force, and then the metal tube and the shaft are placed in the electric heating jacket 3, and the metal tube and the shaft are positioned by the ball 6 in the positioning hole 5;

[0038] Then the first driving member 4 shortens and moves the sliding frame 2 together with the electric heating jacket 3 to the inside of the housing 1, at which time the second driving member 15 extends and drives the magnetic block 7 connected to its end to extend into the electric heating jacket 3;

[0039] The electric heating jacket 3 is turned on to heat the metal tube and the jacket, and the power mechanism 8 is started. The power mechanism 8 pushes the support frame 12 to slide back and forth horizontally. The support frame 12 drives the magnetic blocks 7 at both ends thereof to move back and forth horizontally in the electric heating jacket 3. Under the magnetic force of the magnetic blocks 7, the metal tube and the shaft move back and forth horizontally in the electric heating jacket 3, and the ball bearings 6 support the metal tube and the shaft.

[0040] Driven by the power mechanism 8, the transmission assembly 9 drives the sliding sleeve 11 to rotate continuously, and the sliding sleeve 11 drives the guide member 13 to move synchronously. When the guide member 13 contacts the thrust member 14, the thrust member 14 and the guide member 13 slide against each other, and the guide member 13 drives the sliding sleeve 11 to slide relative to the rotating rod 10. When the second driving member 15 drives the magnetic block 7 to approach one side of the metal pipe and sleeve, the sliding sleeve 11 is quickly pushed out, so that the magnetic block 7 can be quickly pushed to approach the magnet at one end of the metal pipe and sleeve, thereby increasing the instantaneous pushing speed of the metal pipe and sleeve, thereby increasing the moving speed of the metal pipe sleeve in the electric heating sleeve 3, and avoiding the contact of the coating layer on the surface of the metal pipe and sleeve with the surface of the ball 6 at the same position for a long time under high temperature to produce adhesion;

[0041] The magnetic block 7 pushes the metal tube and the shaft to reciprocate in the electric heating sleeve 3, avoiding the influence of the single-position support of the metal tube and the sleeve by the ball 6 on the heating of the supporting position of the metal tube and the sleeve, thereby increasing the heating uniformity of the metal tube and the sleeve; at the same time, when the metal tube and the sleeve move, the ball 6 rolls synchronously, thereby avoiding the reciprocating sliding friction between the metal tube and the sleeve and the supporting position, thereby causing the coating layer on the metal surface to fall off; further, the cooperation of the magnetic block 7 with the magnets at both ends of the metal tube and the sleeve can push the metal tube and the sleeve without contact, thereby further improving the heating uniformity of the metal tube and the sleeve.

[0042] In the embodiment of the present invention, Figure 3 and Figure 4 As shown, as a preferred embodiment of the present invention, the magnetic block 7 is provided with a raised inclined surface, and the magnet and the magnetic block 7 have the same shape; when the magnetic block 7 rotates, the inclined surface of the magnetic block 7 is close to the inclined surface of the magnet. At this time, under the action of the magnetic thrust, the magnet pushes the metal tube and the sleeve to move horizontally, while the metal tube and the sleeve produce spiral rotation, which can avoid uneven local heating of the electric heating sleeve 3, causing uneven heating of the metal tube and the sleeve, and increase the heating uniformity of the metal tube and the sleeve.

[0043] In the embodiment of the present invention, Figure 4 As shown, as a preferred embodiment of the present invention, the guide member 13 is a toothed seat, the thrust member 14 is a rod body, and the rod body is arranged on the circular motion trajectory of the toothed seat; when the inclined surface of the toothed seat contacts the rod body, the rod body and the inclined surface of the toothed seat slide against each other, and the toothed seat drives the sliding sleeve 11 to slide relative to the rotating rod 10.

[0044] In the embodiment of the present invention, Figure 1 As shown, as a preferred embodiment of the present invention, the power mechanism 8 includes an AC motor 81 and a rotating shaft 82, the AC motor 81 is fixedly connected to the inner end surface of the housing 1, the rotating shaft 82 is fixedly connected to the output shaft of the AC motor 81, and the support frame 12 is threadedly connected to the rotating shaft 82; when the AC motor 81 is started, the AC motor 81 drives the rotating shaft 82 to rotate forward and reverse, and the rotating shaft 82 drives the support frame 12 to slide reciprocatingly horizontally through threaded transmission.

[0045] In the embodiment of the present invention, Figure 2-Figure 4 As shown, as a preferred embodiment of the present invention, the transmission assembly 9 includes a gear sleeve 91 and a gear ring 92, the gear sleeve 91 is rotatably connected to the support frame 12, and the gear sleeve 91 is slidably connected along the rotating shaft 82, the gear ring 92 is fixedly connected to the sliding sleeve 11, and the gear sleeve 91 is meshed with the gear ring 92;

[0046] In the transmission assembly 9 , the rotating shaft 82 drives the gear sleeve 91 to rotate, and the gear sleeve 91 drives the sliding sleeve 11 to rotate by meshing with the gear ring 92 .

[0047] In the embodiment of the present invention, Figure 5 As shown, as a preferred embodiment of the present invention, the inner cavity of the electric heating jacket 3 is circular.

[0048] In the embodiment of the present invention, Figure 1 As shown, as a preferred embodiment of the present invention, the outer wall of the magnetic block 7 is circular, and the outer wall of the magnetic block 7 fits with the inner cavity of the electric heating sleeve 3, which can insulate the electric heating sleeve 3, improve the heating efficiency of the metal pipe and sleeve, reduce heat loss, and save energy.

[0049] In the embodiment of the present invention, as a preferred embodiment of the present invention, the first driving member 4 and the second driving member 15 are electrically driven.

[0050] A metal surface heat treatment method, applied to the metal surface heat treatment device described in the above embodiment, comprises the following steps:

[0051] S1: The first driving member 4 is extended, and the sliding frame 2 is pushed by the first driving member 4, and the sliding frame 2 together with the electric heating jacket 3 are pushed to the outside of the housing 1, and the two ends of the metal tube and the shaft are attracted to the magnet by magnetic force, and then the metal tube and the shaft are placed in the electric heating jacket 3, and the metal tube and the shaft are positioned by the ball 6 in the positioning hole 5;

[0052] S2: the first driving member 4 shortens and moves the sliding frame 2 together with the electric heating jacket 3 to the inside of the housing 1, at which time the second driving member 15 extends and drives the magnetic block 7 connected to its end to extend into the electric heating jacket 3;

[0053] S3: Turn on the electric heating sleeve 3 to heat the metal tube and sleeve, start the AC motor 81, the AC motor 81 drives the rotating shaft 82 to rotate forward and reversely, the rotating shaft 82 drives the support frame 12 to slide back and forth horizontally through the threaded transmission, the support frame 12 drives the magnetic blocks 7 at both ends thereof to move back and forth horizontally in the electric heating sleeve 3, under the magnetic force of the magnetic blocks 7, the metal tube and shaft move back and forth horizontally in the electric heating sleeve 3, and the ball 6 supports the metal tube and shaft;

[0054] S4: The rotating shaft 82 drives the gear sleeve 91 to rotate, and the gear sleeve 91 drives the sliding sleeve 11 to rotate by meshing with the gear ring 92, and the sliding sleeve 11 drives the guide member 13 to move synchronously. When the guide member 13 contacts the thrust member 14, the thrust member 14 and the guide member 13 slide against each other, and the guide member 13 drives the sliding sleeve 11 to slide relative to the rotating rod 10. When the No. 2 driving member 15 drives the magnetic block 7 to approach one side of the metal tube and sleeve, the sliding sleeve 11 is quickly pushed out, which can quickly push the magnetic block 7 to the magnet at one end of the metal tube and sleeve, thereby increasing the instantaneous pushing speed of the metal tube and sleeve, thereby increasing the moving speed of the metal tube sleeve in the electric heating sleeve 3, and avoiding the contact between the surface of the metal tube and sleeve and the coating layer on the surface of the ball 6 at the same position for a long time under high temperature to produce adhesion.

[0055] The magnetic block 7 pushes the metal tube and the shaft to reciprocate in the electric heating sleeve 3, avoiding the influence of the single support of the metal tube and the sleeve by the ball 6 on the heating of the supporting part of the metal tube and the sleeve, thereby increasing the heating uniformity of the metal tube and the sleeve; at the same time, when the metal tube and the sleeve move, the ball 6 rolls synchronously, thereby avoiding the reciprocating sliding friction between the metal tube and the sleeve and the supporting part, thereby causing the coating layer on the metal surface to fall off; further, the cooperation of the magnetic block 7 with the magnets at both ends of the metal tube and the sleeve can push the metal tube and the sleeve without contact, thereby further improving the heating uniformity of the metal tube and the sleeve;

[0056] The magnetic block 7 is provided with a raised inclined surface, and the magnet and the magnetic block 7 have the same shape; when the magnetic block 7 rotates, the inclined surface of the magnetic block 7 is close to the inclined surface of the magnet. At this time, under the action of the magnetic thrust, the magnet pushes the metal pipe and the sleeve to move horizontally, while the metal pipe and the sleeve produce spiral rotation, which can avoid uneven local heating of the electric heating sleeve 3, causing uneven heating of the metal pipe and the sleeve, and increase the heating uniformity of the metal pipe and the sleeve.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0058] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A metal surface heat treatment device, comprising a housing (1), wherein the inner end surface of the housing (1) is slidably connected to a sliding frame (2), and a retractably driven first driving member (4) is connected between the sliding frame (2) and the housing (1), characterized in that: The sliding frame (2) is provided with a positioning hole (5), the inner wall of the positioning hole (5) is universally connected with a plurality of balls (6), and both sides of the positioning hole (5) are penetrated by electric heating sleeves (3); The inner side surface of the housing (1) is horizontally slidably connected to a support frame (12), the support frame (12) is connected to a power mechanism (8), the power mechanism (8) is capable of pushing the support frame (12) to slide reciprocatingly horizontally, both ends of the support frame (12) are rotatably connected to a rotating rod (10), the rotating rod (10) is slidably connected to a sliding sleeve (11), the sliding sleeve (11) and the rotating rod (10) are connected via a spring, a transmission component (9) is connected between the sliding sleeve (11) and the power mechanism (8), the transmission component (9) is capable of driving the sliding sleeve (11) to rotate continuously; The sliding sleeve (11) is fixedly connected to a guide member (13), and the support frame (12) is fixedly connected to a thrust member (14), and the thrust member (14) is capable of abutting against the guide member (13); The end surface of the sliding sleeve (11) is fixedly connected to a second driving member (15), and one end of the second driving member (15) is fixedly connected to a magnetic block (7). When heated, magnets are attracted to both ends of the metal tube or the metal shaft, and the surface magnetic poles of the magnet and the magnetic block (7) are opposite.

2. The metal surface heat treatment device according to claim 1, characterized in that: The magnetic block (7) is provided with a raised inclined surface, and the magnet and the magnetic block (7) have the same shape.

3. The metal surface heat treatment device according to claim 1, characterized in that: The guide member (13) is a toothed seat, and the thrust member (14) is a rod body, and the rod body is arranged on a circular motion track of the toothed seat.

4. The metal surface heat treatment device according to claim 1, characterized in that: The power mechanism (8) comprises an AC motor (81) and a rotating shaft (82); the AC motor (81) is fixedly connected to the inner end surface of the housing (1); the rotating shaft (82) is fixedly connected to the output shaft of the AC motor (81); and the support frame (12) is threadedly connected to the rotating shaft (82).

5. The metal surface heat treatment device according to claim 4, characterized in that: The transmission assembly (9) comprises a gear sleeve (91) and a gear ring (92); the gear sleeve (91) is rotatably connected to the support frame (12), and the gear sleeve (91) is slidably connected along the rotating shaft (82); the gear ring (92) is fixedly connected to the sliding sleeve (11), and the gear sleeve (91) and the gear ring (92) are meshed.

6. The metal surface heat treatment device according to claim 1, characterized in that: The inner cavity of the electric heating sleeve (3) is circular.

7. The metal surface heat treatment device according to claim 6, characterized in that: The outer wall of the magnetic block (7) is circular, and the outer wall of the magnetic block (7) fits the inner cavity of the electric heating sleeve (3).

8. The metal surface heat treatment device according to claim 1, characterized in that: The first driving component (4) and the second driving component (15) are electrically driven.

9. A metal surface heat treatment method, applied to the metal surface heat treatment device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: The first driving member (4) is extended, and the sliding frame (2) is pushed by the first driving member (4), and the sliding frame (2) together with the electric heating sleeve (3) is pushed to the outside of the housing (1), and the two ends of the metal tube and the shaft are attracted to the magnet by magnetic force, and then the metal tube and the shaft are placed in the electric heating sleeve (3), and the metal tube and the shaft are positioned by the ball (6) in the positioning hole (5); S2: the first driving member (4) shortens and moves the sliding frame (2) together with the electric heating jacket (3) into the interior of the housing (1), and the second driving member (15) extends and drives the magnetic block (7) connected to its end to extend into the electric heating jacket (3); S3: turning on the electric heating jacket (3) to heat the metal tube and the jacket, starting the power mechanism (8), the power mechanism (8) pushing the support frame (12) to slide reciprocatingly horizontally, the support frame (12) driving the magnetic blocks (7) at both ends thereof to move reciprocatingly horizontally in the electric heating jacket (3), and under the driving force of the magnetic blocks (7), the metal tube and the shaft move reciprocatingly horizontally in the electric heating jacket (3); S4: Driven by the power mechanism (8), the transmission assembly (9) drives the sliding sleeve (11) to rotate continuously, and the sliding sleeve (11) drives the guide member (13) to move synchronously. When the guide member (13) contacts the thrust member (14), the guide member (13) drives the sliding sleeve (11) to slide relative to the rotating rod (10). When the second driving member (15) drives the magnetic block (7) to approach one side of the metal tube and the sleeve, the sliding sleeve (11) is quickly pushed out to quickly push the magnetic block (7) to approach the magnet at one end of the metal tube and the sleeve.

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