Automobile piston friction welding tool and machining method

Abstract

The invention relates to an automobile piston friction welding tool and a machining method, and belongs to the technical field of friction welding, the automobile piston friction welding tool comprises a machining table, a hydraulic cylinder, a movable half frame and a bearing table are arranged on the machining table, and the hydraulic cylinder is used for pushing the movable half frame to move in the direction close to or away from the bearing table; a first positioning assembly is arranged on the movable half frame, and the first positioning assembly is used for clamping and limiting a piston head of the automobile piston; a clamping assembly and a bearing motor are arranged on the bearing platform, the clamping assembly is used for clamping and limiting a piston body of the automobile piston, the bearing motor is used for driving the clamping assembly to rotate relative to the bearing platform, and the center line of a rotating shaft coincides with the center line of a rotating shaft of the first positioning disc. And the piston machining efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of friction welding, and in particular to a friction welding tool and a processing method for an automobile piston. Background Art

[0002] The automobile piston is a key component of the engine. It is located in the cylinder and its main function is to withstand the pressure of the combustion gas and transmit the force to the crankshaft through the piston pin and connecting rod, driving the crankshaft to rotate, thereby outputting power.

[0003] The piston is generally composed of three parts: the head, the ring groove and the skirt. The head is the main part that bears the pressure and usually has pits of various shapes to optimize combustion. The skirt plays a guiding role and can prevent the piston from swinging in the cylinder. The piston head and piston body of traditional automobile pistons are formed in one piece.

[0004] Traditional automobile pistons are integrally formed, and have the defect that the oil filling holes and channels in the piston are difficult to process. Summary of the invention

[0005] In order to facilitate the processing of oil filling holes and channels, reduce processing difficulty, and improve the processing efficiency of piston heads, the present application provides an automobile piston friction welding tool and processing method.

[0006] In the first aspect, the present application provides a friction welding tool for automobile pistons, which adopts the following technical solution: An automobile piston friction welding tool comprises a processing table, on which a hydraulic cylinder, a movable half frame and a bearing platform are arranged, and the hydraulic cylinder is used to push the movable half frame to move toward or away from the bearing platform; The movable half frame is provided with a first positioning assembly, the first positioning assembly comprises a first positioning column, a first positioning disk and a first motor, the first positioning disk is rotatably arranged on the side of the movable half frame away from the support platform and the rotating shaft is arranged in the horizontal direction and passes through the center of the first positioning disk, the first motor is used to drive the first positioning disk to rotate relative to the movable half frame, a plurality of first positioning columns are arranged, and adjacent first positioning columns are distributed at equal central angle intervals with the center of the first positioning disk as the center of the circle, one end of all the first positioning columns are slidably connected to the first positioning disk and slide synchronously in the direction approaching or away from the center of the first positioning disk, the other ends of all the first positioning columns pass through the movable half frame for clamping and limiting the piston head of the automobile piston, and the first positioning columns are slidably arranged relative to the movable half frame; the sliding paths of all the first positioning columns on the first positioning disk are vortex-shaped, and the sliding paths on the movable half frame are radial; The support platform is provided with a clamping assembly and a receiving motor, the clamping assembly is used to clamp and limit the piston body of the automobile piston, and the receiving motor is used to drive the clamping assembly to rotate relative to the support platform and the center line of the rotating shaft coincides with the center line of the rotating shaft of the first positioning plate.

[0007] By adopting the above technical scheme, the automobile piston is disassembled into a piston head and a piston body for separate processing, and friction welding is performed after the processing is completed, replacing the one-piece molding method of the automobile piston. The separate processing is adopted to facilitate the processing of the oil filling hole and the channel. The piston head is clamped and limited on the side wall of the movable half frame facing the support platform through the first positioning component, and the piston head is placed on the outer wall of the movable half frame. The first motor drives the first positioning plate to rotate. Since the sliding paths of all the first positioning columns on the first positioning plate are vortex-shaped, the first positioning columns follow the rotation of the first positioning plate to produce a displacement trend. Since the sliding paths of the first positioning columns on the first positioning plate are radial, all the positioning columns eventually move synchronously in the direction close to the piston head to clamp and limit the piston head; the piston body is clamped and limited by the clamping component, the receiving motor is started, the clamping component drives the piston body to rotate, and the hydraulic cylinder is started, so that the piston head and the piston body are abutted and continuously pressurized to complete friction welding, so as to facilitate the processing of the oil filling hole and the channel, reduce the processing difficulty, and improve the processing efficiency of the piston head.

[0008] Optionally, the clamping assembly includes a base and a cylinder, the base is provided with a groove, the notch of the groove is arranged toward the movable half frame, one end of the cylinder body is fixed on the groove wall of the groove, two cylinders are provided, and the piston ends of the two cylinders are arranged opposite to each other; the base is rotatably set on the supporting platform, the output end of the receiving motor is fixedly connected to the base, and the receiving motor is fixed on the supporting platform.

[0009] By adopting the above technical solution, the two cylinders are started at the same time to clamp the piston body, and the receiving motor is started to drive the entire clamping assembly to rotate, thereby achieving the effect of driving the piston body to rotate.

[0010] Optionally, a support column is provided in the groove, the support column is arranged horizontally, one end of the support column is fixedly connected to the bottom of the groove, and the other end is arranged in a cantilevered state toward the midpoint of the two cylinders.

[0011] By adopting the above technical solution, a certain pressure is required between the piston head and the piston body during friction welding. The support column is located on the side of the piston body away from the piston head to support the piston body, thereby reducing the clamping force required by the clamping assembly on the piston body and reducing the possibility of the piston body being deformed by clamping.

[0012] Optionally, a washer is threadedly connected to the support column, and the washer is located at the cantilevered end of the support column.

[0013] By adopting the above technical solution, such an arrangement can conveniently replace the gasket head, and different gasket heads correspond to piston bodies of different shapes and sizes.

[0014] Optionally, a slide groove is provided on the processing table, and the length direction of the slide groove is provided along the direction of the connection line between the movable half frame and the supporting platform. A displacement motor, a screw rod and a slider are arranged on the processing table. The slider is located in the slide groove, and the top of the slider is fixedly connected to the bottom surface of the supporting platform. The supporting platform is slidably arranged on the processing table, the screw rod is located in the slide groove and is arranged along the length direction of the slide groove, one end of the screw rod is fixedly connected to the output end of the displacement motor, the screw rod passes through the slider, and the screw rod is threadedly connected to the slider.

[0015] By adopting the above technical solution, when the adjusted length of the piston rod of the hydraulic cylinder is not enough, the displacement motor is started to adjust the distance between the support platform and the movable half frame to meet the processing requirements.

[0016] Optionally, a positioning half frame is fixed on the processing table, the hydraulic cylinder is fixed on the positioning half frame, and the piston rod of the hydraulic cylinder passes through the center of the first positioning disk and is fixedly connected to the movable half frame.

[0017] By adopting the above technical solution, the positioning plate frame provides a concealed space for the first positioning component and also provides a fixed position for the hydraulic cylinder.

[0018] Optionally, a second positioning assembly is provided in the movable half frame, the second positioning assembly includes a second positioning column, a second positioning disk and a second motor, the piston rod of the hydraulic cylinder passes through the center of the second positioning disk, the second positioning disk is located on the side of the first positioning disk away from the movable half frame, and the second positioning disk is rotatably arranged on the piston rod of the hydraulic cylinder; the second motor is fixed on the movable half frame to drive the second positioning disk to rotate; The second positioning posts are provided in plurality, and adjacent second positioning posts are distributed at equal central angle intervals with the center of the second positioning disk as the center of the circle. One end of all the second positioning posts is slidably connected to the second positioning disk and slides synchronously in a direction approaching or away from the center of the second positioning disk. The other ends of all the second positioning posts pass through the movable half frame for clamping and limiting the piston head of the automobile piston, and the second positioning posts are slidably arranged relative to the movable half frame; the sliding paths of all the second positioning posts on the second positioning disk are spiral-shaped, and the sliding paths on the movable half frame are radial.

[0019] By adopting the above technical solution, the second positioning column can cooperate with the first positioning column to form an internal and external bidirectional limiting method, that is, the piston head is shaped like a circular ring, all the first positioning columns are in contact with the inner wall of the piston head, and have an outward movement tendency, thereby limiting the circular ring-shaped piston head, and all the second positioning columns are in contact with the outer wall of the piston head, and have an inward movement tendency, thereby limiting the circular ring-shaped piston head, and the bidirectional limiting is more stable and firm.

[0020] Optionally, the number of the second positioning posts is different from that of the first positioning posts.

[0021] By adopting the above technical solution, such a layout forms an asymmetric layout. When the piston head is subjected to a rotational force, the first positioning column and the second positioning column can both generate a combined moment to resist the rotation, which helps to enhance the limiting ability of the piston ring and prevent the piston ring from rotating during the friction welding process.

[0022] Optionally, outer walls of the first positioning column and the second positioning column are coated with a tungsten carbide coating.

[0023] By adopting the above technical solution, tungsten carbide has the characteristics of high hardness and high melting point, and its coating surface microstructure is relatively rough. When it contacts the piston head, this rough surface will increase the resistance during the contact process. In addition, the chemical bonding between the tungsten carbide coating and materials such as metals also enhances the friction force, achieving the effect of improving the stability of the first positioning column and the second positioning column clamping the piston head.

[0024] In a second aspect, the present application provides a method for friction welding of automobile pistons, which adopts the following technical solution: A friction welding method for an automobile piston comprises the following steps: S1. Place the pre-processed piston head on the movable half frame, place the pre-processed piston body on the clamping assembly, adjust the first positioning assembly and the second positioning assembly to clamp the piston head to a limited position, and adjust the clamping assembly to clamp the piston body to a limited position; S2, start the receiving motor, and the clamping assembly drives the piston body to start rotating; S3, start the hydraulic cylinder, and the movable half frame carries the piston head and moves toward the piston body until the piston head abuts against the piston body to generate friction; S4, the hydraulic cylinder is continuously started, and the pressure between the piston head and the piston body rises until the friction welding is completed; S5. The clamping assembly is reset first, and then the hydraulic cylinder, the first positioning assembly and the second positioning assembly are reset.

[0025] By adopting the above technical solution, the automobile piston is split into a piston head and a piston body, and the two are welded together by friction welding. In this way, the piston head can be processed separately, and high-strength steel materials can be used. In addition, due to the separate processing, the processing difficulty of the oil injection hole and the oil injection channel is greatly reduced, which greatly reduces the scrap rate.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The automobile piston is split into a piston head and a piston body, and the two are welded together by friction welding. The friction welding is realized by cooperating with the first positioning component and the clamping component. In this way, the automobile piston can be processed separately first and then friction welded together. The processing difficulty of the oil injection hole and the oil injection channel is reduced, and the scrap rate is reduced; 2. The second positioning column can cooperate with the first positioning column to form an internal and external two-way limit mode, that is, the piston head is annular, all the first positioning columns are in contact with the inner wall of the piston head, and have an outward movement trend, thereby limiting the annular piston head, and all the second positioning columns are in contact with the outer wall of the piston head, and have an inward movement trend, thereby limiting the annular piston head, and the two-way limit is more stable and firm; 3. The number of second positioning posts is different from that of first positioning posts, so that an asymmetric layout is formed. In this asymmetric layout, when the piston head is subjected to a rotational force, both the first positioning post and the second positioning post can generate a combined moment to resist the rotation, which helps to enhance the limiting capacity of the piston ring and prevent the piston ring from rotating during the friction welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application; Figure 2 It is a schematic diagram of the local structure at the abutment; Figure 3 It is a partial structural schematic diagram for showing the location of the second positioning component; Figure 4 It is a local structural schematic diagram for showing the location of the first positioning component; Figure 5 This is a state diagram of the first positioning assembly and the second positioning assembly clamping and limiting the piston head.

[0028] Explanation of the accompanying drawings: 1. processing table; 11. hydraulic cylinder; 12. movable half frame; 121. first sliding hole; 122. second sliding hole; 13. support platform; 131. receiving motor; 14. slide groove; 15. displacement motor; 16. screw rod; 17. slider; 18. positioning half frame; 2. first positioning assembly; 21. first positioning column; 22. first positioning plate; 221. first arc-shaped strip hole; 222. first gear ring; 23. first motor; 231. first gear; 3. clamping assembly; 31. base; 311. groove; 32. cylinder; 4. support column; 41. pad head; 5. second positioning assembly; 51. second positioning column; 52. second positioning plate; 521. second arc-shaped strip hole; 522. second gear ring; 53. second motor; 531. second gear. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-Figure 5 This application is described in further detail.

[0030] The embodiment of the present application discloses a friction welding tool for an automobile piston.

[0031] refer to Figure 1A friction welding tool for automobile pistons includes a processing table 1, on which a first positioning component 2, a clamping component 3, a hydraulic cylinder 11 and a receiving motor 131 are arranged. The automobile piston is divided into a piston head and a piston body. The first positioning component 2 clamps and limits the piston head, and the clamping component 3 clamps and limits the piston body. The receiving motor 131 drives the clamping component 3 to start rotating, and the hydraulic cylinder 11 drives the first positioning component 2 to move toward the clamping component 3, and finally the piston head contacts the rotating piston body to realize friction welding.

[0032] refer to Figure 1 and Figure 2 , a slide groove 14 is provided on the top surface of the processing table 1, and the length direction of the slide groove 14 is provided along the direction in which the first positioning component 2 moves relative to the clamping component 3. A support 13, a displacement motor 15, a screw 16 and a slider 17 are provided on the processing table 1. The support 13 is slidably provided on the processing table 1, the slider 17 is located in the slide groove 14, the top of the slider 17 is fixedly connected to the bottom surface of the support 13, the screw 16 is located in the slide groove 14 and the length direction is provided along the length direction of the slide groove 14, the displacement motor 15 is fixed on the processing table 1, the output end of the displacement motor 15 is fixedly connected to one end of the screw 16, the screw 16 passes through the slider 17, and the screw 16 is threadedly connected to the slider 17. When the displacement motor 15 is started, the support 13 is driven to move toward or away from the first positioning component 2 through the screw 16 and the slider 17.

[0033] refer to Figure 1 and Figure 2 The support platform 13 is provided with a clamping assembly 3, which is located on the side wall of the support platform 13 facing the first positioning assembly 2. The clamping assembly 3 includes a base 31 and a cylinder 32. The base 31 is provided with a groove 311, and the notch of the groove 311 faces the first positioning assembly 2. Two cylinders 32 are provided, and the cylinders 32 are located in the groove 311. One end of the body of the cylinder 32 is fixed on the groove wall of the groove 311, and the two cylinders 32 are symmetrically arranged. The base 31 is provided with a support column 4, which is located in the groove 311. One end of the support column 4 is fixedly connected to the groove bottom of the groove 311, and the other end is cantilevered. The cantilevered end of the support column 4 is threadedly connected with a pad 41. The receiving motor 131 is fixed on the support platform 13, and the rotating end of the receiving motor 131 is fixedly connected to the base 31. When the receiving motor 131 is started, the receiving motor 131 drives the base 31 to rotate relative to the support platform 13, and the rotating axis is arranged in the horizontal direction.

[0034] refer to Figure 1A positioning half frame 18 and a movable half frame 12 are provided on the processing table 1. The positioning half frame 18 and the movable half frame 12 are both C-shaped and offset from each other by 90°. The positioning half frame 18 is fixed on the top surface of the processing table 1. The body of the hydraulic cylinder 11 is fixed on the positioning half frame 18. The piston rod of the hydraulic cylinder 11 penetrates the positioning half frame 18 and is fixedly connected with the movable half frame 12. The hydraulic cylinder 11 pushes the movable half frame 12 to move in a direction close to or away from the supporting platform 13.

[0035] refer to Figure 1 The first positioning component 2 is located on the side wall of the movable half frame 12 away from the supporting platform 13. The movable half frame 12 is also provided with a second positioning component 5. The second positioning component 5 and the first positioning component 2 are located on the same side of the movable half frame 12.

[0036] refer to Figure 3 , Figure 4 and Figure 5 The first positioning assembly 2 includes a first positioning column 21, a first positioning disk 22 and a first motor 23. The first positioning disk 22 is rotatably arranged relative to the movable half frame 12 and the rotation axis is arranged in the horizontal direction and passes through the center of the first positioning disk 22. The piston rod of the hydraulic cylinder 11 passes through the center of the first positioning disk 22. The first positioning disk 22 is rotatably arranged relative to the hydraulic cylinder 11. A first gear ring 222 is fixed to the circumferential outer wall of the first positioning disk 22 in an annular sleeve. The first motor 23 is fixed to the inner wall of the movable half frame 12. A first gear 231 is fixed to the output end of the first motor 23. The first gear 231 meshes with the first gear ring 222. There are multiple first positioning posts 21. In this embodiment, there are three first positioning posts 21. Adjacent first positioning posts 21 are distributed at equal central angles with the center of the first positioning disk 22 as the center. One end of all first positioning posts 21 is slidably connected to the first positioning disk 22 and slides synchronously in the direction close to or away from the center of the first positioning disk 22. The other ends of all first positioning posts 21 penetrate the movable half frame 12 to clamp the piston head of the automobile piston. The sliding paths of all first positioning posts 21 on the first positioning disk 22 are vortex-shaped. The first positioning disk 22 is provided with first arc-shaped bar holes 221. Three first arc-shaped bar holes 221 are correspondingly provided. The three first arc-shaped bar holes 221 form a vortex shape, that is, the first arc-shaped bar hole 221 is the sliding path of the first positioning post 21 on the first positioning disk 22, and one end of the first positioning post 21 is located in the first arc-shaped bar hole 221.

[0037] refer to Figure 4 and Figure 5The movable half frame 12 is provided with first sliding holes 121, and the sliding paths of all the first positioning posts 21 on the movable half frame 12 are radial. Three first sliding holes 121 are provided corresponding to the number of the first positioning posts 21, and the three first sliding holes 121 form a radial shape on the movable half frame 12, that is, the first sliding holes 121 are the sliding paths of the first positioning posts 21 on the movable half frame 12, and the end of the first positioning post 21 away from the first positioning plate 22 passes through the first sliding hole 121.

[0038] The first motor 23 is started, and the first positioning disc 22 is driven to rotate through the meshing of the first gear 231 and the first gear ring 222. Since the sliding paths of all the first positioning posts 21 on the first positioning disc 22 are vortex-shaped, the first positioning posts 21 rotate with the first positioning disc 22 to generate a displacement trend. Since the sliding paths of the first positioning posts 21 on the first positioning disc 22 are radial, all the first positioning posts 21 eventually move synchronously toward the direction close to the piston head, and eventually the ends of the first positioning posts 21 abut against the inner wall of the piston head, and the three first positioning posts 21 are distributed in a triangular shape to clamp the piston head in reverse and limit the position. The center line of the rotation axis of the base 31 coincides with the center line of the rotation axis of the first positioning disc 22.

[0039] refer to Figure 3 , Figure 4 and Figure 5The second positioning assembly 5 includes a second positioning column 51, a second positioning plate 52 and a second motor 53. The piston rod of the hydraulic cylinder 11 passes through the center of the second positioning plate 52. The second positioning plate 52 is rotatably arranged on the piston rod of the hydraulic cylinder 11. A second gear ring 522 is fixed on the circumferential outer wall of the second positioning plate 52. The second motor 53 is fixed on the inner wall of the movable half frame 12. A second gear 531 is fixed on the output end of the second motor 53. The second gear 531 meshes with the second gear ring 522. The diameter of the second positioning plate 52 is greater than that of the first positioning plate 22. There are multiple second positioning posts 51, and the number of second positioning posts 51 is different from that of first positioning posts 21. In this embodiment, there are four second positioning posts 51, and adjacent second positioning posts 51 are distributed at equal central angles with the center of the second positioning disk 52 as the center. One end of all second positioning posts 51 is slidably connected with the second positioning disk 52 and slides synchronously in the direction close to or away from the center of the first positioning disk 22. The other end of all second positioning posts 51 penetrates the movable half frame 12 for clamping and limiting the piston head of the automobile piston. The second positioning posts 51 are slidably arranged relative to the movable half frame 12. The sliding paths of all second positioning posts 51 on the second positioning disk 52 are vortex-shaped, corresponding to four second arc-shaped strip holes 521 opened on the second positioning disk 52. The sliding paths of all second positioning posts 51 on the movable half frame 12 are radial, corresponding to four second sliding holes 122 opened on the movable half frame 12. One end of the second positioning post 51 is located in the second arc-shaped strip hole 521, and the other end penetrates the corresponding second sliding hole 122. The outer walls of the first positioning column 21 and the second positioning column 51 are coated with a tungsten carbide coating.

[0040] The operation mode of the second positioning component 5 is similar to that of the first positioning component 2. The second motor 53 is started, and eventually all the second positioning columns 51 move synchronously toward the direction close to the piston head. Eventually, the end of the second positioning column 51 abuts against the outer wall of the piston head, and the four second positioning columns 51 are distributed in a square shape to clamp the piston head in a positive direction and limit it.

[0041] The implementation principle of a friction welding tool for an automobile piston in an embodiment of the present application is as follows: the piston head is bidirectionally clamped and limited on the side wall of the movable half frame 12 facing the support platform 13 through the first positioning component 2 and the second positioning component 5; the piston body is clamped and limited through the clamping component 3, and the receiving motor 131 is started to make the clamping component 3 drive the piston body to rotate, and the hydraulic cylinder 11 is started to move the piston head in the direction close to the piston body, and finally the piston head abuts against the piston body and continuously applies pressure to complete the friction welding. The automobile piston is processed separately and then assembled by friction welding, so as to facilitate the processing of oil filling holes and channels, reduce the processing difficulty, and improve the processing efficiency of automobile pistons.

[0042] The embodiment of the present application also discloses a method for friction welding of an automobile piston.

[0043] The following steps are involved: S1, placing the pre-processed piston head on the movable half frame 12, placing the pre-processed piston body on the clamping assembly 3, adjusting the first positioning assembly 2 and the second positioning assembly 5 to clamp the piston head to a limited position, and adjusting the clamping assembly 3 to clamp the piston body to a limited position; S2, start the receiving motor 131, and the clamping assembly 3 drives the piston body to start rotating; S3, start the hydraulic cylinder 11, and the movable half frame 12 carries the piston head and moves toward the piston body until the piston head abuts against the piston body to generate friction; S4, the hydraulic cylinder 11 is continuously started, and the pressure between the piston head and the piston body rises until the friction welding is completed; S5, the clamping assembly 3 is reset first, and then the hydraulic cylinder 11, the first positioning assembly 2 and the second positioning assembly 5 are reset.

[0044] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A friction welding tool for automobile pistons, comprising a processing table (1), characterized in that: The processing table (1) is provided with a hydraulic cylinder (11), a movable half frame (12) and a support platform (13), wherein the hydraulic cylinder (11) is used to push the movable half frame (12) to move in a direction close to or away from the support platform (13); The movable half frame (12) is provided with a first positioning assembly (2), the first positioning assembly (2) comprising a first positioning column (21), a first positioning disk (22) and a first motor (23); the first positioning disk (22) is rotatably arranged on a side of the movable half frame (12) away from the support platform (13), and the rotation axis is arranged in a horizontal direction and passes through the center of the first positioning disk (22); the first motor (23) is used to drive the first positioning disk (22) to rotate relative to the movable half frame (12); a plurality of first positioning columns (21) are provided, and adjacent first positioning columns (21) are connected by the first positioning disks. (22) is the center of the circle and is distributed at equal central angles. One end of all first positioning posts (21) is slidably connected to the first positioning plate (22) and slides synchronously in a direction close to or away from the center of the first positioning plate (22). The other ends of all first positioning posts (21) penetrate the movable half frame (12) and are used to clamp and limit the piston head of the automobile piston. The first positioning posts (21) are slidably arranged relative to the movable half frame (12). The sliding paths of all first positioning posts (21) on the first positioning plate (22) are spiral, and the sliding paths on the movable half frame (12) are radial. The support platform (13) is provided with a clamping assembly (3) and a receiving motor (131); the clamping assembly (3) is used to clamp and limit the piston body of the automobile piston; the receiving motor (131) is used to drive the clamping assembly (3) to rotate relative to the support platform (13) and the center line of the rotating shaft coincides with the center line of the rotating shaft of the first positioning plate (22).

2. The automobile piston friction welding tool according to claim 1, characterized in that: The clamping assembly (3) comprises a base (31) and a cylinder (32); a groove (311) is provided on the base (31); the notch of the groove (311) is arranged toward the movable half frame (12); one end of the body of the cylinder (32) is fixed to the groove wall of the groove (311); two cylinders (32) are provided; the piston ends of the two cylinders (32) are arranged opposite to each other; the base (31) is rotatably arranged on the support platform (13); the output end of the receiving motor (131) is fixedly connected to the base (31); and the receiving motor (131) is fixed to the support platform (13).

3. The automobile piston friction welding tool according to claim 2, characterized in that: A support column (4) is arranged in the groove (311), and the support column (4) is arranged horizontally, one end of the support column (4) is fixedly connected to the groove bottom of the groove (311), and the other end is arranged in a cantilevered shape toward the midpoint of the two cylinders (32).

4. The automobile piston friction welding tool according to claim 3, characterized in that: A gasket head (41) is threadedly connected to the support column (4), and the gasket head (41) is located at the cantilevered end of the support column (4).

5. The automobile piston friction welding tool according to claim 1, characterized in that: The processing table (1) is provided with a slide groove (14), and the length direction of the slide groove (14) is provided along the direction of the line connecting the movable half frame (12) and the support platform (13). The processing table (1) is provided with a displacement motor (15), a screw rod (16) and a slider (17). The slider (17) is located in the slide groove (14), and the top of the slider (17) is fixedly connected to the bottom surface of the support platform (13). The support platform (13) is slidably arranged on the processing table (1), and the screw rod (16) is located in the slide groove (14) and arranged along the length direction of the slide groove (14). One end of the screw rod (16) is fixedly connected to the output end of the displacement motor (15), and the screw rod (16) passes through the slider (17). The screw rod (16) and the slider (17) are threadedly connected.

6. The automobile piston friction welding tool according to claim 1, characterized in that: A positioning half frame (18) is fixed on the processing table (1), and a hydraulic cylinder (11) is fixed on the positioning half frame (18). The piston rod of the hydraulic cylinder (11) passes through the center of the first positioning plate (22) and is fixedly connected to the movable half frame (12).

7. The automobile piston friction welding tool according to claim 6, characterized in that: A second positioning assembly (5) is arranged in the movable half frame (12), the second positioning assembly (5) comprising a second positioning column (51), a second positioning disk (52) and a second motor (53); a piston rod of the hydraulic cylinder (11) passes through the center of the second positioning disk (52); the second positioning disk (52) is located on a side of the first positioning disk (22) away from the movable half frame (12); the second positioning disk (52) is rotatably arranged on the piston rod of the hydraulic cylinder (11); and the second motor (53) is fixed on the movable half frame (12) and is used to drive the second positioning disk (52) to rotate; A plurality of second positioning columns (51) are provided, and adjacent second positioning columns (51) are distributed at equal central angle intervals with the center of the second positioning disk (52) as the center of the circle. One end of all second positioning columns (51) is slidably connected to the second positioning disk (52) and slides synchronously in a direction approaching or moving away from the center of the second positioning disk (52). The other ends of all second positioning columns (51) penetrate the movable half frame (12) and are used to clamp and limit the piston head of the automobile piston. The second positioning columns (51) are slidably arranged relative to the movable half frame (12); the sliding paths of all second positioning columns (51) on the second positioning disk (52) are spiral-shaped, and the sliding paths on the movable half frame (12) are radial.

8. The automobile piston friction welding tool according to claim 7, characterized in that: The number of the second positioning posts (51) and the number of the first positioning posts (21) are different.

9. The automobile piston friction welding tool according to claim 7, characterized in that: The outer walls of the first positioning column (21) and the second positioning column (51) are both coated with a tungsten carbide coating.

10. A method for friction welding of automobile pistons using the automobile piston friction welding tool as claimed in claim 7, characterized in that: The following steps are involved: S1, placing the pre-processed piston head on the movable half frame (12), placing the pre-processed piston body on the clamping assembly (3), adjusting the first positioning assembly (2) and the second positioning assembly (5) to clamp the piston head to a limited position, and adjusting the clamping assembly (3) to clamp the piston body to a limited position; S2, starting the receiving motor (131), and the clamping assembly (3) drives the piston body to start rotating; S3, starting the hydraulic cylinder (11), and the movable half frame (12) carries the piston head and moves in a direction close to the piston body until the piston head abuts against the piston body to generate friction; S4, the hydraulic cylinder (11) is continuously started, and the pressure between the piston head and the piston body increases until the friction welding is completed; S5, the clamping assembly (3) is reset first, and then the hydraulic cylinder (11), the first positioning assembly (2) and the second positioning assembly (5) are reset.

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