Axle straightening device and straightening method

Abstract

The present invention provides an axle straightening device and method, comprising a straightening platform, a carrying device, a straightening device, a collecting device, and other components. A clamping device is used to clamp the forged axle into the straightening channel of the straightening platform. The carrying device can continuously clamp the axle from both sides to achieve straightening processing. At the same time, a protective gas can be blown out from the first air blowing opening and the second air blowing opening on the surface of the straightening block. On the one hand, it can protect the axle surface and reduce its oxidation degree. On the other hand, the blown protective gas can directly act on the axle surface, blowing off some of the generated oxides and separating them from the axle, thereby achieving automatic cleaning of the axle and reducing the impact on axle straightening. The invention can suppress the rate of oxide generation during the axle straightening process and can quickly strip the oxidized substances on the axle surface, thereby ensuring the quality of the finished axle.

Description

Technical Field

[0001] The present invention relates to the technical field of axles, and in particular to an axle straightening device and a straightening method. Background Art

[0002] The wheelset axle needs to be straightened at the end of the forging process to ensure that the coaxiality of the axle after processing meets the axle usage requirements; the two-way straightening extrusion equipment can be used to straighten the forged axle from both sides to improve the accuracy of the axle and shorten the axle straightening time, which can solve the problems of low straightening accuracy and complicated straightening operation steps of traditional single-sided straightening machines.

[0003] The bidirectional straightening equipment is usually used to extrude and straighten the axles that have been heated to a high temperature. Straightening the axles by heating them to a high temperature can better adjust the coaxiality of the axles. During the straightening process, an oxide layer will be generated on the surface of the axles that have been forged at high temperature. During the bidirectional straightening process, the position of the axle needs to be rotated to control the position. Some impurities and some oxidized substances remain on the arc-shaped inner wall of the straightening block. During the repeated straightening process, irregular protrusions or oxide particles may be included on the surface, making the axle surface rough and increasing the process time required for subsequent turning. At the same time, some oxide layers cannot be peeled off from the axle surface in time, and adhere to the straightening points on the axle surface, which will have a certain impact on the straightening process and subsequent turning of the axle. Summary of the Invention

[0004] In response to the above problems, the present invention provides an axle straightening device and a straightening method, which can suppress the rate of oxide generation during the axle straightening process, and at the same time can quickly peel off the oxidized substances on the surface of the axle to ensure the quality of the finished axle.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is:

[0006] An axle straightening device, comprising:

[0007] A straightening platform, the upper surface of which is provided with a straightening channel for accommodating the axle;

[0008] The bearing device is arranged on both sides of the straightening channel, and is used to bear the axle and control its rotation around the axis;

[0009] The straightening device includes a plurality of straightening components, the straightening components are located on both sides of the straightening channel and are symmetrically arranged, and the straightening components include straightening blocks and straightening bases for mounting the straightening blocks;

[0010] The collecting device is arranged in the straightening channel along the length direction of the axle, and includes an arc-shaped collecting plate, and a negative pressure component is provided at the middle position of the bottom end of the collecting plate;

[0011] Among them, the side wall of the straightening block is provided with a first air blowing opening and a second air blowing opening, and an air blowing circuit is formed between the first air blowing opening and the second air blowing opening and the negative pressure component. When the straightening block contacts the axle, the protective gas is blown out alternately from the first air blowing opening and the second air blowing opening to form a protective air flow circulation.

[0012] Preferably, a collection opening is provided at the bottom end of the collection plate, and a storage box is provided opposite to the collection opening. A spiral cleaning device is provided inside the storage box, and the spiral cleaning device includes two spiral cleaning blades with opposite spiral rotation directions. An electric control device is provided on the outside of the storage box for controlling the rotation of the spiral cleaning blades.

[0013] Preferably, the negative pressure component includes a filter plate, which is vertically arranged in the accommodating box. The filter plate is located on both sides of the spiral cleaning blade and is tightly pressed against the surface thereof.

[0014] Preferably, a purging device is further included, which is arranged above the straightening channel and opposite to the middle position of the top end of the axle, wherein high-pressure gas is blown toward the middle position of the axle surface through the purging device.

[0015] Preferably, the purging device includes a purging rod arranged along the length direction of the straightening channel, and a purging air nozzle is provided at the bottom end of the purging rod corresponding to the position of the straightening device. The purging device also includes a deflection control device, which controls the deflection of the purging rod to be offset from the top of the straightening channel.

[0016] Preferably, the first air blowing opening is opposite to the axle, the straightening block has a first curvature close to the first air blowing opening and a second curvature away from the first air blowing opening, wherein the first curvature is greater than the second curvature.

[0017] Preferably, the second air blowing opening is arranged at an angle, and its inclination direction corresponds to the edge of the collecting plate, and accommodating baffles are fixedly connected to both ends of the collecting plate.

[0018] Preferably, it further comprises a straightening drive device, through which the movement of the straightening block is controlled, the straightening drive device comprises a drive body and a drive arm, and the drive arm is detachably fixedly connected to the straightening base.

[0019] Preferably, the carrying device includes a rotation control component for controlling the rotation of the axle, and a lifting component for controlling the lifting of the axle.

[0020] A method for straightening an axle comprises the following steps:

[0021] S1. Place the axle in the straightening channel through the clamping device and support the axle through the supporting device;

[0022] S2, controlling the straightening block of the straightening device to fit the axle surface while controlling the axle rotation through the bearing device;

[0023] S3, controlling the shielding gas to be blown out from the first air blowing opening while the axle rotates;

[0024] S4. After the axle rotates one circle, it is adjusted to a predetermined deflection angle according to the deflection direction of the axle, and the axle is continuously extruded and straightened by the straightening block. During the straightening process, the protective gas is blown out alternately from the first air blowing opening and the second air blowing opening to form a protective air flow cycle.

[0025] The beneficial effects of the present invention are:

[0026] The straightening device can be used to extrude and straighten the axle from both sides to ensure the coaxiality of the axle and meet the axle processing requirements; and in the process of extrusion and straightening, the protective gas is discharged from the first air blowing opening and the second air blowing opening in sequence, which can accelerate the stripping of the oxidized substances produced on the surface of the axle and the centralized cleaning of the oxidized substances remaining on the surface of the collecting plate, thereby ensuring the normal extrusion and straightening of the axle and the quality of the finished axle; at the same time, the oxides can be cleaned in time and collected in a centralized manner, which reduces the work intensity of the staff and improves the efficiency of axle processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the main structure of the present invention;

[0030] Figure 4 It is a side structural schematic diagram of the present invention;

[0031] Figure 5 This is an enlarged structural diagram of point B of the present invention;

[0032] Figure 6 This is a schematic diagram of the cross-sectional structure of the present invention along line AA;

[0033] Figure 7 It is a schematic diagram of the enlarged structure of point C of the present invention.

[0034] In the figure: 100, straightening platform; 200, carrying device; 210, lifting assembly; 220, rotation control assembly; 221, friction wheel; 222, drive shaft; 223, drive mounting frame; 300, straightening device; 310, straightening base; 320, straightening block; 321, first air blowing opening; 322, second air blowing opening; 400, straightening drive device; 410, drive body; 420, drive arm; 500, axle; 600, collecting device; 610, collecting plate; 611, accommodating baffle; 620, accommodating box; 630, spiral cleaning device; 640, negative pressure assembly; 641, filter plate; 700, purge device; 710, purge rod; 720, deflection control device. Implementation Method

[0035] The present invention will be further described below with reference to the accompanying drawings and examples.

[0036] Refer to the attached Figure 1 -Attached Figure 7 , an axle straightening device, including components such as a straightening platform 100, a carrying device 200, a straightening device 300, and a collecting device 600. The forged axle 500 is clamped into the straightening channel of the straightening platform 100 by a clamping device, and the axle 500 can be continuously clamped from both sides by the carrying device 200 to achieve straightening processing; at the same time, protective gas can be blown out from the first air blowing opening 321 and the second air blowing opening 322 on the surface of the straightening block 320, on the one hand, the surface of the axle 500 can be protected and its oxidation degree can be reduced, and on the other hand, the blown protective gas can directly act on the surface of the axle 500, blowing off some of the generated oxides and separating them from the axle 500, thereby achieving automatic cleaning of the axle 500, reducing the impact on the straightening of the axle 500, ensuring the coaxiality of the axle 500, facilitating subsequent surface turning processing and other operations on the axle, improving the processing efficiency of the axle 500, and improving the quality of the finished axle 500.

[0037] The axle 500 is arranged in the middle position of the upper end surface of the straightening platform 100 for accommodating the axle 500; the carrying device 200 is arranged on both sides of the straightening channel for carrying the axle 500 and controlling its rotation around the axis, and controlling the axle 500 to rotate at a predetermined angle according to the deflection and bending direction of the axle 500, so that the bent side of the axle 500 corresponds to the position of the straightening device 300, so that the straightening device 300 can complete the extrusion straightening of the axle 500 from both sides, and the axle 500 is controlled to rotate to different positions by the carrying device 200, and the axle 500 is continuously extruded by the straightening device 300 to complete the continuous straightening process and ensure the coaxiality of the axle 500.

[0038] The straightening device 300 includes several groups of straightening components, which are located on both sides of the straightening channel and are arranged symmetrically. The straightening components include a straightening block 320 and a straightening base 310 for installing the straightening block 320. The straightening base 310 and the straightening block 320 are movably connected. The straightening block 320 is in a predetermined position under normal circumstances. The surface of the straightening block 320 corresponding to the axle 500 is concave and can fit with the surface of the axle 500 to achieve clamping of the axle 500.

[0039] The collecting device 600 is arranged in the straightening channel along the length direction of the axle 500. The collecting device 600 can collect the oxides squeezed off the surface of the axle 500. It includes an arc-shaped collecting plate 610, and a negative pressure component 640 is provided in the middle position of the bottom end of the collecting plate 610.

[0040] Please refer to the attached Figure 7 ; Among them, a first air blowing opening 321 and a second air blowing opening 322 are provided on the side wall of the straightening block 320, and an air blowing circuit is formed between the first air blowing opening 321 and the second air blowing opening 322 and the negative pressure component 640. When the straightening block 320 contacts the axle 500, the protective gas is blown out alternately from the first air blowing opening 321 and the second air blowing opening 322 to form a protective air flow cycle. When the straightening block 320 and the axle 500 are in a clamping state, the first air blowing opening 321 can fit the surface of the axle 500. At this time, the protective gas is automatically blown out from the second air blowing opening 322, which can act on the surface of the collecting device 600 to accelerate the collection of oxides. When the straightening block 320 and the axle 500 are not in a fitted state, this At the same time, the gas is blown out from the first air blowing opening 321, which can directly act on the surface of the axle 500. The high-pressure protective gas directly acts on the surface of the axle 500, accelerating the stripping of some impurities and oxides, allowing them to fall to the surface of the collection device 600 below for collection; by alternately controlling the protective gas to be blown out from the first air blowing opening 321 and the second air blowing opening 322 during the clamping process, the stripping and collection of impurities on the surface of the axle 500 can be accelerated, ensuring the normal straightening of the axle; at the same time, the blown protective gas can fill the surrounding position of the axle clamp, which can effectively delay the oxidation of the extrusion position, and effectively reduce the production of oxidizing substances from the root; the protective gas here can be selected as carbon dioxide gas.

[0041] The negative pressure component 640 is connected to the first air blowing opening 321 and the second air blowing opening 322 and is provided with a gas delivery pump, which can blow the protective gas at the negative pressure component 640 out from the first air blowing opening 321 and the second air blowing opening 322 again, thereby reducing the amount of gas loss; at the same time, an electrically controlled valve can be provided in the first air blowing opening 321 and the second air blowing opening 322 to control the alternating outflow of gas; at the same time, in order to reduce the difficulty of equipment control, a pressure valve can also be provided in the second air blowing opening 322. After the straightening block 320 is fitted with the axle 500, the gas outflow opening at the first air blowing opening 321 becomes smaller, and the rate of gas outflow from the first air blowing opening 321 is lower. The gas in the circuit breaks through the pressure valve and is blown out from the second air blowing opening 322, thereby realizing automatic discharge and switching process during the extrusion process, thereby reducing the difficulty of gas switching control; through the above-mentioned device setting, gas switching is automatically carried out, and the gas switching failure rate is low. At the same time, it can be well adapted to the high temperature environment of axle straightening, thereby reducing the probability of equipment failure.

[0042] It should be noted here that the position of the first air blowing opening 321 is opposite to the position of the axle 500, the straightening block 320 has a first curvature at the end close to the first air blowing opening 321, and a second curvature at the end away from the first air blowing opening 321, wherein the first curvature is greater than the second curvature, that is, the first air blowing opening 321 is more concave around the first air blowing opening 321, and its surface will not directly contact the surface of the axle 500. During the extrusion process, part of the protective gas can still be blown out from this position; at the same time, the parts with smaller curvatures on both sides can fit with the surface of the axle 500 to achieve clamping, and can form a sealed channel with a smaller gap between the axle 500, which can ensure the sealing of both sides, so as to ensure that the air pressure in the circuit can be increased to open the pressure valve and ensure the normal switching of the gas.

[0043] In addition, the second air blowing opening 322 is set at an angle, and its inclination direction corresponds to the edge of the collection plate 610. The two ends of the collection plate 610 are fixedly connected with a accommodating baffle 611. After the protective gas is blown out from the second air blowing opening 322, it can directly act on the surface of the collection plate 610, and can sweep the oxidized substances on the surface of the collection plate 610 from top to bottom to the middle position, thereby realizing a centralized collection process.

[0044] At the same time, a collection opening is provided at the bottom end of the collection plate 610, and a containing box 620 is provided opposite to the collection opening. The oxidizing substance and some impurities can be blown to the middle position and fall into the containing box 620 for centralized collection. At the same time, the negative pressure component 640 is installed in the containing box 620, which can simultaneously attract the substance from the bottom to improve the effect of impurity collection.

[0045] The axles used in railway wheelsets are relatively large, and the processing equipment is relatively large. In order to collect impurities in a centralized manner without removing the collecting plate 610, a spiral cleaning device 630 is provided inside the receiving box 620. The spiral cleaning device 630 includes two spiral cleaning blades with opposite spiral rotation directions. An electric control device is provided on the outside of the receiving box 620 to control the rotation of the spiral cleaning blades. While the electric control device controls the rotation of the spiral cleaning blades, the oxide markers can move synchronously from the middle toward both sides and be collected from both sides. At the same time, by providing two spiral cleaning blades with opposite rotation directions for collection, it can adapt to longer-sized wheelset axles and shorten the travel path of the oxidizing substances. This can improve the centralized cleaning efficiency of the oxidizing substances and avoid the problem of excessive oxidizing substances causing blockage.

[0046] Please refer to the attached Figure 7 ; The negative pressure component 640 includes a filter plate 641, which is vertically arranged in the receiving box 620. The filter plate 641 is located on both sides of the spiral cleaning blade and is tightly pressed against its surface. The surface of the filter plate 641 has fine filter holes, which can isolate larger impurities and discharge most of the impurities from the receiving box 620 during the rotation of the spiral cleaning device 630; the negative pressure component 640 is connected through a negative pressure pipe, and a sedimentation filter device is connected in series in the negative pressure pipe to filter some fine impurities to ensure the purity of the gas finally blown out from the first air blowing opening 321 and the second air blowing opening 322, and to ensure the effective blowing of the gas afterwards.

[0047] The equipment also includes a purging device 700, which is arranged above the straightening channel and opposite to the middle position of the top end of the axle 500. The purging device 700 blows high-pressure gas to the middle position of the surface of the axle 500. The high-pressure gas is also a protective gas and can directly act on the surface of the axle 500 from the top end. On the one hand, it can realize the purging of the top part of the axle 500 and accelerate the stripping of surface impurities and oxidizing substances; at the same time, it can replenish the protective gas around the axle 500 to enter the circuit below, so that the axle 500 is fully protected by the protective gas, further reducing the oxidation rate of the axle 500 and reducing the production rate of oxidizing substances.

[0048] Please refer to the attached Figure 4; The purging device 700 includes a purging rod 710 arranged along the length direction of the straightening channel, and a purging air nozzle is provided at the bottom end of the purging rod 710 corresponding to the position of the straightening device 300. The purging device 700 also includes a deflection control device 720, which controls the deflection of the purging rod 710 to stagger from the top of the straightening channel. During the straightening process of the axle 500, the deflection control device 720 controls the purging rod 710 to deflect to the middle position of the top end of the axle 500, so that the high-pressure protective gas can be blown out directly and act on the surface of the axle 500; during the loading and unloading process of the axle 500, the purging rod 710 is staggered by the deflection control device 720 to ensure that the axle 500 can pass normally and be placed in the predetermined straightening channel to complete the straightening process; the above-mentioned deflection control device 720 can be selected as a gear control method, which has a fast response speed, precise control angle, and low failure rate, and can operate stably for a long time in a high temperature environment.

[0049] The device also includes a straightening drive device 400, which controls the movement of the straightening block 320. The straightening drive device 400 includes a driving body 410 and a driving arm 420. The driving arm 420 is detachably fixedly connected to the straightening base 310. The driving body 410 controls the two driving arms 420 to deflect toward the middle position, controls the movement of the straightening block 320 at the upper end, and completes the extrusion straightening of the axle 500. The driving arm 420 can be selected as a hydraulic drive device to provide sufficient extrusion force to achieve efficient straightening operation.

[0050] Please refer to the attached Figure 3 The carrying device 200 includes a rotation control component 220 for controlling the rotation of the axle 500. The rotation control component 220 includes a friction wheel 221, a drive shaft 222, and a drive mounting frame 223. The axle 500 is placed on the upper end of the two friction wheels 221 for rotation. The carrying device 200 also includes a lifting component 210 for controlling the lifting of the axle 500. The lifting component 210 can be hydraulically controlled to allow the axle 500 to be lifted to different heights, allowing the equipment to perform extrusion operations on axles 500 of different sizes to complete adaptive straightening processing.

[0051] A method for straightening an axle comprises the following steps:

[0052] S1. Place the axle 500 in the straightening channel through the clamping device, and support the axle 500 through the carrying device 200. Place the forged axle 500 on the surface of the carrying device 200 through the clamping device to complete the preparatory operation for straightening. The carrying device 200 can control the rotation of the axle 500 and adjust the height of the axle 500 so that the position of the axle 500 corresponds to the position of the straightening device 300, and complete the subsequent straightening processing operation.

[0053] S2. While controlling the straightening block 320 of the straightening device 300 to fit the surface of the axle 500, the axle 500 is controlled to rotate through the supporting device 200. At this time, the straightening block 320 and the axle 500 are in a non-clamped state, and there is a certain gap between them. The axle 500 can be controlled to rotate around a predetermined axis through the supporting device 200.

[0054] S3. While the axle 500 is rotating, the protective gas is controlled to be blown out from the first air blowing opening 321. The high-pressure protective gas can directly act on the surface of the axle 500, so that the oxidized substances on the surface are quickly peeled off, and the blown protective gas can form a protective atmosphere around the axle 500, reducing the oxidation rate of the axle 500; at the same time, the gap between the axle 500 and the straightening device 300 is small, and a high-speed airflow can be formed in the gap, which can ensure the efficient peeling of the oxidized substances at the extrusion contact position.

[0055] S4. After the axle 500 rotates one circle, it is adjusted to a predetermined deflection angle according to the deflection direction of the axle 500, and the axle 500 is continuously extruded and straightened through the straightening block 320. During the straightening process, the protective gas is blown out alternately from the first air blowing opening 321 and the second air blowing opening 322 to form a protective air flow cycle. During the extrusion straightening process, the protective gas is blown out from the first air blowing opening 321 and the second air blowing opening 322 in turn, which can clean the newly generated oxidants on the surface of the axle 500 and the oxidants that fall to the surface of the collection plate 610, respectively, thereby accelerating the centralized collection process of the oxidants.

[0056] Finally, it should be noted that the oxidizing substances fall into the containing box 620 of the collection device 600 in a concentrated manner. By controlling the rotation of the spiral cleaning device 630, the oxidizing substances can be cleaned in a concentrated manner. At the same time, after the axle is placed, the purge rod 710 is adjusted to a predetermined angle position, so that the gas blown out by the purge rod 710 can act on the surface of the axle 500 from the top, which can further accelerate the cleaning of the oxidizing substances and replenish the lost protective gas, thereby ensuring that the axle 500 is in a protective atmosphere during the straightening process, ensuring the quality of the finished axle 500, and reducing the difficulty and cost of subsequent processing.

[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, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An axle straightening device, characterized in that: include: A straightening platform (100) having an upper end surface provided with a straightening channel for accommodating an axle (500); The carrying device (200) is arranged on both sides of the straightening channel and is used to carry the axle (500) and control its rotation around the axis; A straightening device (300) comprises a plurality of straightening components, the straightening components being located on both sides of the straightening channel and arranged symmetrically, the straightening components comprising a straightening block (320) and a straightening base (310) for mounting the straightening block (320); A collecting device (600) is arranged in the straightening channel along the length direction of the axle (500), comprising an arc-shaped collecting plate (610), wherein a negative pressure component (640) is provided at the middle position of the bottom end of the collecting plate (610); The side wall of the straightening block (320) is provided with a first air blowing opening (321) and a second air blowing opening (322), and an air blowing circuit is formed between the first air blowing opening (321) and the second air blowing opening (322) and the negative pressure component (640). When the straightening block (320) contacts the axle (500), protective gas is blown out alternately from the first air blowing opening (321) and the second air blowing opening (322) to form a protective air flow cycle. When the straightening block and the axle are in a clamped state, the first air blowing opening can fit the surface of the axle, and the protective gas is automatically blown out from the second air blowing opening, which can act on the surface of the collection device to accelerate the collection of oxides; When the straightening block and the axle are not in a fitted state, gas is blown out from the first air blowing opening. The high-pressure protective gas directly acts on the surface of the axle, accelerating the peeling of some impurities and oxides, allowing them to fall to the surface of the collection device below for collection.

2. The device according to claim 1, characterized in that The bottom end of the collecting plate (610) is provided with a collecting opening, and a receiving box (620) is provided opposite to the collecting opening. A spiral cleaning device (630) is provided inside the receiving box (620). The spiral cleaning device (630) comprises two spiral cleaning blades with opposite spiral rotation directions. An electric control device is provided outside the receiving box (620) for controlling the rotation of the spiral cleaning blades.

3. The device according to claim 2, characterized in that The negative pressure assembly (640) comprises a filter plate (641), which is vertically arranged in the accommodating box (620). The filter plate (641) is located on both sides of the spiral cleaning blade and is tightly pressed against its surface.

4. The device according to claim 1, characterized in that It also includes a purge device (700), which is arranged above the straightening channel and opposite to the middle position of the top end of the axle (500), wherein high-pressure gas is blown toward the middle position of the surface of the axle (500) through the purge device (700).

5. The device according to claim 4, characterized in that The purge device (700) comprises a purge rod (710) arranged along the length direction of the straightening channel, a purge air nozzle is arranged at the bottom end of the purge rod (710) and corresponds to the position of the straightening device (300), and the purge device (700) further comprises a deflection control device (720) for controlling the deflection of the purge rod (710) to stagger from above the straightening channel.

6. The device according to claim 1, characterized in that The first air blowing opening (321) is located opposite to the axle (500), and the straightening block (320) has a first curvature at an end close to the first air blowing opening (321) and a second curvature at an end away from the first air blowing opening (321), wherein the first curvature is greater than the second curvature.

7. The device according to claim 1, characterized in that The second air blowing opening (322) is arranged at an angle, and its inclination direction corresponds to the edge of the collecting plate (610). Both ends of the collecting plate (610) are fixedly connected with accommodating baffles (611).

8. The device according to any one of claims 1 to 7, characterized in that: The straightening drive device (400) is further included, and the movement of the straightening block (320) is controlled by the straightening drive device (400). The straightening drive device (400) includes a driving body (410) and a driving arm (420). The driving arm (420) is detachably fixedly connected to the straightening base (310).

9. The device according to any one of claims 1 to 7, characterized in that: The carrying device (200) comprises a rotation control component (220) for controlling the rotation of the axle (500), and a lifting component (210) for controlling the lifting of the axle (500).

10. A method for straightening an axle, characterized in that: The steps include: S1, placing the axle (500) in the straightening channel by means of a clamping device, and supporting the axle (500) by means of a supporting device (200); S2, controlling the straightening block (320) of the straightening device (300) to fit the surface of the axle (500), while controlling the axle (500) to rotate via the supporting device (200); S3, controlling the protective gas to be blown out from the first air blowing opening (321) while the axle (500) rotates; S4, after the axle (500) rotates one circle, the axle (500) is adjusted to a predetermined deflection angle according to the deflection direction of the axle (500), and the axle (500) is continuously extruded and straightened by the straightening block (320). During the straightening process, the protective gas is alternately blown out from the first air blowing opening (321) and the second air blowing opening (322) to form a protective air flow cycle.

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