Turning machine

Abstract

The invention relates to the technical field of aluminum alloy bar machining, in particular to a skin turning machine which comprises a lathe, a turning mechanism and a clamping and conveying mechanism, the turning mechanism is installed in the center of the lathe, the clamping and conveying mechanism is installed on the left side of the lathe, the turning mechanism is provided with a turning part and a driving part, and the driving part drives the turning part to rotate at a high speed. A turning disc arranged in the turning part is used for rotationally turning a clamped bar, a hydraulic clamping mechanism and a main aligning part are arranged in the clamping and conveying mechanism, the hydraulic clamping mechanism is used for clamping the bar to prevent the bar from being scratched, and the main aligning part is used for adjusting the center of the bar to be consistent with the center of the turning part. And four groups of guide rods and cutting blades mounted on a cutter head in the turning disc can be used for turning a large-diameter bar, so that the production efficiency is improved, the guide rods and the cutting blades can be quickly replaced after being finely adjusted through a cutter adjuster, the working efficiency is improved, the long bar can be conveniently turned, and the applicability of the device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum alloy bar processing, in particular to a carbody machine. BACKGROUND

[0002] Aluminum alloy extruded profiles have been widely used in the fields of aviation, aerospace, automobiles, etc. due to their small density, good corrosion resistance and good processing performance. The general manufacturing process of aluminum alloy extruded profiles is to melt aluminum ingots and alloys in a certain proportion, then cast them into round bars of a certain diameter by using hot top horizontal casting process, and then heat them to obtain the required shape under a certain pressure through a certain shaped extrusion die. During the hot top casting process, a certain thickness of oxide skin is generated on the surface of the aluminum alloy cast bar. The oxide skin has high hardness and may be rolled into the product during the subsequent extrusion process, resulting in internal defects. Therefore, it is necessary to remove the oxide skin before extrusion. For example, the publication number CN111014742B discloses a tool and method for machining the outside circle of a stationary slender flexible rod, relating to the technical field of mechanical processing. The tool for machining the outside circle of a stationary slender flexible rod includes a clamping device with a clamping hole, and a tool assembly including a cutting head, a turning tool bar mounted on the cutting head, and a plurality of support rods mounted on the cutting head. The cutting head is provided with an insertion hole. The slender flexible rod workpiece is clamped by the clamping device, the tool assembly is installed on the boring machine spindle, the boring machine spindle drives the cutting head to rotate and moves the boring machine spindle axially, and the turning tool bar on the cutting head is used to turn the workpiece. The present application can machine the outside circle of a stationary slender flexible rod workpiece without the need for large tooling to support the workpiece to reduce the disturbance generated when the workpiece rotates, which can reduce the processing cost of the workpiece. The mechanical processing device in the prior art can meet the needs of use, but the traditional turning method is to clamp the bar on the clamp and rotate at high speed, and the turning tool moves axially after radial feed. This method is generally applicable to small diameter bars, but not suitable for large diameter bars, because large diameter bars require high rotation equipment, and different diameter bars cannot be quickly positioned and cut, affecting work efficiency. In addition, the center of the long bar is easy to sink and produce a certain arc, affecting the center cutting. SUMMARY

[0003] The present application aims to provide a carbody machine that can be used for turning the surface oxide skin of large diameter aluminum alloy bars.

[0004] In order to achieve the above object, the present application provides the following technical scheme: the car body machine, including lathe, turning mechanism and clamping mechanism, the center of the lathe is provided with turning mechanism, the left side of the lathe is provided with clamping mechanism, the turning mechanism is provided with turning part and driving part, the driving part drives the high-speed rotation of the turning part, the turning disc provided in the turning part is used for rotating and turning the clamped bar.

[0005] Preferably, the clamping mechanism is provided with a hydraulic clamping mechanism and a main centering part, the hydraulic clamping mechanism clamps the bar to avoid material scratch, and the main centering part adjusts the center of the bar to be consistent with the center of the turning part.

[0006] Preferably, the right side of the lathe is provided with a pushing part and a clamping car, the pushing part drives the clamping car to clamp and move the bar, and the limiting parts installed in front and back of the clamping car effectively clamp and transport the bar.

[0007] Preferably, the right end of the lathe is provided with an extraction mechanism, the extraction mechanism includes an extraction part and a secondary centering part, the extraction part is lowered to extract the bar under the adjustment of the secondary centering part, and the main centering part and the secondary centering part have the same structure.

[0008] Preferably, the turning part is installed in the inside front side of the turning box, the driving part is installed in the inside rear side of the turning box, the turning part includes a main shaft, a fixed bearing and a gear disc, the both sides of the main shaft are provided with fixed bearings installed in the turning box, the center of the main shaft is provided with a gear disc, the gear disc is driven to rotate by the driving part, and the left end of the main shaft is provided with a turning disc.

[0009] Preferably, the turning disc includes an intermediate disc, a cam disc and a cutter disc, the left end of the intermediate disc is provided with the cam disc, the intermediate disc is installed on the left wall of the main shaft, the left end of the cam disc is provided with the cutter disc, the side of the cutter disc is uniformly provided with four groups of guide rods, four groups of the guide rods are provided with cutting blades, the guide rods and the cutting blades can be synchronously adjusted in radial direction, a single group of the guide rods can be finely adjusted by using a cutter adjuster, and the intermediate disc and the gear disc are made of high-strength wear-resistant steel.

[0010] Preferably, the driving part includes a main motor and a gear box, the gear box is installed on the rear side of the turning box, the main motor drives the gear box to rotate, and the front end of the gear box is engaged with the gear disc to rotate at high speed.

[0011] Preferably, the hydraulic clamping mechanism is installed in the clamping box, the center of the clamping box is provided with two installation cavities, two groups of the installation cavities are communicated through the through grooves, and the top ends of the two groups of installation cavities are provided with installation openings.

[0012] Preferably, the hydraulic clamping mechanism comprises four groups of first guide rails and four groups of fixing blocks, the four groups of first guide rails are fixed on the two walls of the two groups of installation cavities respectively, two groups of fixing blocks are slidably arranged in the installation cavities respectively, the center of the four groups of fixing blocks is provided with a limiting bearing, a driving shaft is inserted in the single group of limiting bearings, the front end of the single group of driving shafts is provided with a pinch roller, the parallel two groups of fixing blocks are connected through a connecting block, the top two groups of fixing blocks are provided with a first hydraulic cylinder at the top end, the rear end of the horizontal two groups of driving shafts is connected to rotate synchronously by using a sprocket set, and the rear end of the right two groups of driving shafts is provided with a feeding motor.

[0013] Preferably, the main centering piece comprises a mounting circular block and a convex cylinder, a convex cavity is formed in the inside of the mounting circular block, the convex cylinder is arranged in the convex cavity and slides up and down, a spring is fixed at the bottom end of the convex cylinder, and the spring is arranged at the bottom end in the inside of the mounting circular block.

[0014] Preferably, the pushing piece comprises a second servo motor and a ball screw, the ball screw is arranged at the right end of the front side of the lathe, the left end of the second servo motor is provided with a speed reducer, the speed reducer drives the ball screw to rotate, the center of the ball screw is provided with a silk cylinder in a threaded manner, the top end of the silk cylinder is provided with a connecting plate, the right end of the connecting plate is connected with a moving frame, and the moving frame slides in the slide rail arranged at the bottom end.

[0015] Preferably, the clamping vehicle comprises a clamping box and two side mirror image mounted limiting pieces, the clamping box is arranged at the center of the moving frame, the limiting piece comprises a side box and a second guide rail, the front and rear walls of the inside of the side box are provided with the second guide rail, the inside of the two groups of second guide rails is slidably provided with a U-shaped frame, the inside of the two groups of U-shaped frames is provided with a rubber roller, the center of the two groups of rubber rollers contacts the bar material, and the outside of the two groups of U-shaped frames is provided with a second hydraulic cylinder to synchronously push.

[0016] Preferably, the pulling-out piece is arranged at the left side in the inside of the pulling-out box, a vice centering piece is arranged at the bottom side in the inside of the pulling-out box, the pulling-out piece comprises two groups of third guide rails and two groups of vice mounting blocks, the two groups of third guide rails are slidably provided with the two groups of vice mounting blocks, the inside of the single group of vice mounting blocks is provided with a vice rotating shaft which rotates, the rear end of the upper vice rotating shaft is provided with a third servo motor, and the front end of the two groups of vice rotating shafts is provided with a pulling-out roller.

[0017] Compared with the prior art, the present application has the following beneficial effects: 1. Through the turning disc inside the cutter disc installation four groups of guide rod and cutting blade can be on large diameter bar turning, thereby improving production efficiency, through the guide rod and cutting blade through the tool adjuster fine tuning can be replaced quickly, improve work efficiency, intermediate disc, gear disc uses high strength wear-resistant steel material to improve the service life, through the pinch mechanism, clamping car and pull out mechanism convenient for long bar turning, improve the applicability of the device; 2. Through the hydraulic clamping mechanism installed in the pinch box can clamp the delivered bar to avoid material scratches, through the feed motor drive drive shaft rotation to rotate relatively under the connection of the chain group to effectively transport the bar, through the pull-out piece and the hydraulic clamping mechanism and the center of the turning mechanism remain parallel, thereby providing stability for long bar turning, high efficiency and convenience; 3. Through the second servo motor drives the ball screw to rotate under the reducer, and then drives the clamping car installed on the rear side to move and adjust, which is convenient for further clamping metal rods to improve stability, the second hydraulic cylinder in the limiting piece synchronously pushes the rubber roller inward to clamp the bar, thereby protecting the bar from scratches. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, without creative labor, other drawings can also be obtained from these drawings.

[0019] Figure 1 The structure of the present application is a front view schematic diagram; Figure 2 The structure of the present application is a side view schematic diagram; Figure 3 The hydraulic clamping mechanism structure of the present application is a schematic diagram; Figure 4 The pinch box structure of the present application is a schematic diagram; Figure 5 The main centering piece of the present application is a cross-sectional enlarged schematic diagram; Figure 6 The turning mechanism rear view of the present application is a schematic diagram; Figure 7 The turning box internal structure of the present application is a schematic diagram; Figure 8 The turning disc structure of the present application is an enlarged schematic diagram; Figure 9 The pusher structure of the present application is a side view schematic diagram; Figure 10 The clamping car structure of the present application is an enlarged schematic diagram; Figure 11 Extraction mechanism of the application.

[0020] In the figure: 1, lathe; 2, turning mechanism; 21, turning box; 22, turning piece; 221, main shaft; 222, gear disc; 223, fixed bearing; 224, turning disc; 2241, intermediate disc; 2242, cam disc; 2243, cutter disc; 2244, guide rod; 2245, cutting blade; 23, driving piece; 231, gear box; 232, main motor; 3, clamping mechanism; 31, clamping box; 311, mounting cavity; 312, through slot; 313, mounting port; 32, hydraulic clamping mechanism; 321, first guide rail; 322, fixed block; 323, limiting bearing; 324, driving shaft; 325, clamping roller; 326, first hydraulic cylinder; 327, connecting block; 328, sprocket set; 329, feed motor; 33, main aligning piece; 331, mounting round block; 332, convex cavity; 333, convex cylinder; 334, spring; 4, pushing piece; 41, second servo motor; 42, speed reducer; 43, ball screw; 44, silk cylinder; 45, connecting plate; 46, moving frame; 47, slide rail; 5, clamping car; 51, clamping box; 52, limiting piece; 521, side box; 522, second guide rail; 523, U-shaped frame; 524, rubber roller; 525, second hydraulic cylinder; 6, extraction mechanism; 61, extraction box; 62, extraction piece; 621, third guide rail; 622, auxiliary mounting block; 623, auxiliary rotating shaft; 624, third servo motor; 625, extraction roller; 63, auxiliary aligning piece. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0022] Please refer to Figures 1-11The application provides a vehicle body machine, which comprises a lathe 1, a turning mechanism 2 and a clamping mechanism 3, the turning mechanism 2 is arranged at the center of the lathe 1, the clamping mechanism 3 is arranged at the left side of the lathe 1, the turning mechanism 2 is provided with a turning part 22 and a driving part 23, the driving part 23 drives the turning part 22 to rotate at high speed, a turning disc 224 arranged in the turning part 22 rotates and turns the clamped bar material, the clamping mechanism 3 is provided with a hydraulic clamping mechanism 32 and a main centering part 33, the hydraulic clamping mechanism 32 clamps the bar material to avoid scratching the material, the main centering part 33 adjusts the center of the bar material to be consistent with the center of the turning part 22, a pushing part 4 and a clamping vehicle 5 are arranged at the right side of the lathe 1, the pushing part 4 drives the clamping vehicle 5 to clamp and move the bar material, limiting parts 52 arranged in front of and behind the clamping vehicle 5 effectively clamp and transport the bar material, an extracting mechanism 6 is arranged at the right end of the lathe 1, the extracting mechanism 6 comprises an extracting part 62 and a secondary centering part 63, the extracting part 62 extracts the bar material under the adjustment of the secondary centering part 63, and the main centering part 33 and the secondary centering part 63 have the same structure.

[0023] Further, the turning part 22 is arranged at the front side of the inside of a turning box 21, the driving part 23 is arranged at the rear side of the inside of the turning box 21, the turning part 22 comprises a main shaft 221, a fixed bearing 223 and a gear disc 222, the fixed bearings 223 are arranged at the two sides of the main shaft 221 in the turning box 21, the gear disc 222 is arranged at the center of the main shaft 221, the gear disc 222 is driven to rotate by the driving part 23, the turning disc 224 is arranged at the left end of the main shaft 221, the turning disc 224 comprises a middle disc 2241, a cam disc 2242 and a cutter disc 2243, the cam disc 2242 is arranged at the left end of the middle disc 2241, the middle disc 2241 is arranged at the left wall of the main shaft 221, the cutter disc 2243 is arranged at the left end of the cam disc 2242, four groups of guide rods 2244 are uniformly arranged at the side of the cutter disc 2243, four groups of cutting blades 2245 are arranged in the guide rods 2244, the guide rods 2244 and the cutting blades 2245 can be synchronously adjusted in the radial direction, a single group of guide rods 2244 can be finely adjusted by using a cutter adjuster, and the middle disc 2241 and the gear disc 222 are made of high-strength wear-resistant steel, can be quickly replaced and improve work efficiency.

[0024] Further, the driving part 23 comprises a main motor 232 and a gear box 231, the gear box 231 is arranged at the rear side of the turning box 21, the main motor 232 drives the gear box 231 to rotate, the gear box 231 meshes with the gear disc 222 at the front end to rotate at high speed, and the turning part is driven to rotate at high speed, thereby improving the turning efficiency.

[0025] Further, the hydraulic clamping mechanism 32 is installed in the pinch box 31, the center of the pinch box 31 is provided with two installation cavities 311, the two installation cavities 311 are communicated through the through grooves 312, the top ends of the two installation cavities 311 are provided with installation openings 313, the hydraulic clamping mechanism 32 comprises four first guide rails 321 and four fixed blocks 322, the four first guide rails 321 are respectively fixedly arranged on the two walls of the two installation cavities 311, the two installation cavities 311 are respectively slidably provided with the two fixed blocks 322, the centers of the four fixed blocks 322 are provided with limit bearings 323, the single limit bearing 323 is inserted with a driving shaft 324, the front end of the single driving shaft 324 is provided with a pinch roller 325, the parallel two fixed blocks 322 are connected through a connecting block 327, the top ends of the upper two fixed blocks 322 are provided with first hydraulic cylinders 326, the rear ends of the horizontal two driving shafts 324 are connected to rotate synchronously through a chain wheel set 328, the rear ends of the right two driving shafts 324 are provided with a feeding motor 329, so that the bar is effectively conveyed and the efficiency is improved.

[0026] Further, the main centering piece 33 comprises an installation round block 331 and a convex cylindrical 333, the inside of the installation round block 331 is provided with a convex cavity 332, the convex cylindrical 333 is slidably arranged in the convex cavity 332, the bottom end of the convex cylindrical 333 is fixedly provided with a spring 334, the spring 334 is arranged at the inside bottom end of the installation round block 331, so that the height is adjusted and the conveying is facilitated.

[0027] As a further improvement of the present application, the pushing piece 4 comprises a second servo motor 41 and a ball screw 43, the ball screw 43 is arranged at the right end of the front side of the lathe 1, the left end of the second servo motor 41 is provided with a speed reducer 42, the speed reducer 42 drives the ball screw 43 to rotate, the center of the ball screw 43 is threadedly provided with a silk cylinder 44, the top end of the silk cylinder 44 is provided with a connecting plate 45, the right end of the connecting plate 45 is connected with a moving frame 46, the moving frame 46 is slidably arranged in the slide rail 47 arranged at the bottom end, so that the distance between the clamping vehicle and the turning mechanism is adjusted, and the turning of the bar with different lengths is suitable.

[0028] Further, the clamping vehicle 5 comprises a clamping box 51 and two mirror image arranged limiting pieces 52, the clamping box 51 is arranged at the center of the moving frame 46, the limiting piece 52 comprises a side box 521 and a second guide rail 522, the inside of the side box 521 is provided with the second guide rail 522, the inside of the two second guide rails 522 is slidably provided with a U-shaped frame 523, the inside of the two U-shaped frames 523 is provided with a rubber roller 524, the centers of the two rubber rollers 524 contact the bar, the outside of the two U-shaped frames 523 is provided with a second hydraulic cylinder 525 to synchronously push, so that the bar is clamped and prevented from being scratched.

[0029] Further, the extraction piece 62 is installed on the left side of the inside of the extraction box 61, the inside bottom of the extraction box 61 is provided with a secondary aligning piece 63, the extraction piece 62 comprises two groups of third guide rails 621 and two groups of secondary mounting blocks 622, the two groups of secondary mounting blocks 622 are slidably installed in the two groups of third guide rails 621, one group of secondary mounting blocks 622 is internally provided with a secondary rotating shaft 623 which is rotatably installed, the rear end of the upper secondary rotating shaft 623 is provided with a third servo motor 624, and the front ends of the two groups of secondary rotating shafts 623 are provided with extraction rollers 625, which can quickly extract the bar and improve the processing efficiency.

[0030] Working principle: when the large-diameter bar needs to be cut during operation, first, the two groups of feeding motors 329 installed on the right side of the cavity 311 of the clamping box 31 are started to rotate, and the two groups of feeding motors 329 are opposite to each other and are transported to the right side, and the rotation of the feeding motor 329 drives the two groups of driving shafts 324 at the front end to rotate, and when the two groups of driving shafts 324 on the right side rotate, the left two groups of driving shafts 324 can be driven to rotate through the sprocket set 328; the four groups of driving shafts 324 rotate in the fixed block 322, and the clamping rollers 325 installed at the front ends of the four groups of driving shafts 324 can clamp and transport the bar to the right side of the turning piece 22, and when the diameters of the bars are different, only the first hydraulic cylinder 326 at the top needs to be adjusted to adjust the height of the two groups of fixed blocks 322 on the top, and the height of the two groups of fixed blocks 322 on the bottom can be pushed by the spring 334 at the bottom of the convex cylinder 333 to keep the center of the four clamping rollers 325 aligned with the center of the turning piece 22.

[0031] When the bar is pushed to the turning piece 22, the main motor 232 is started to drive the gear box 231 to rotate, the gear box 231 drives the gear disc 222 fixed at the center of the main shaft 221 in the turning piece 22 to rotate, the gear disc 222 drives the main shaft 221 to rotate at high speed in the fixed bearing 223, and the rotation of the main shaft 221 drives the installed turning disc 224 to rotate, and the guide rod 2244 and the cutting blade 2245 in the knife disc 2243 can be adjusted to turn the moving bar, and the cut bar can be clamped by the rubber rollers 524 installed in the U-shaped frame 523 after the center of the right and left side boxes 521 of the clamping vehicle 5 is powered on. The second hydraulic cylinder 525 is started to push the connected U-shaped frame 523 inward, the rubber rollers 524 installed in the U-shaped frame 523 can clamp the turned bar, and then the second servo motor 41 is started to drive the ball screw 43 to rotate under the drive of the speed reducer 42, the rotation of the ball screw 43 drives the silk cylinder 44 and the connecting plate 45 installed at the center to move, and when the silk cylinder 44 and the connecting plate 45 move, the moving frame 46 moves in the sliding rail 47 to adjust the position of the clamping vehicle 5.

[0032] When the bar in the clamping vehicle 5 moves to the extraction mechanism 6, the third servo motor 624 is started to drive the installed secondary shaft 623 to rotate in the secondary mounting block 622. The rotation of the secondary shaft 623 drives the front end extraction roller 625 to rotate. The rotation of the two groups of extraction rollers 625 drives the bar to be extracted to complete the cutting operation.

[0033] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any person skilled in the art can easily implement the present application according to the drawings and the above description. However, any equivalent changes, modifications and evolutions made by those skilled in the art within the scope of the technical solutions of the present application, using the above disclosed technical content, are equivalent embodiments of the present application. At the same time, any equivalent changes, modifications and evolutions made according to the essential technology of the above embodiments are still within the protection scope of the technical solutions of the present application.

Claims

1. A car body machining device, comprising a lathe (1), a turning mechanism (2) and a clamping mechanism (3), the lathe (1) is provided with the turning mechanism (2) in the center, and the lathe (1) is provided with the clamping mechanism (3) on the left side, characterized in that: The turning mechanism (2) is provided with a turning piece (22) and a driving piece (23), the driving piece (23) drives the turning piece (22) to rotate at high speed, and the turning disc (224) provided in the turning piece (22) rotates to turn the clamped bar material; The clamping mechanism (3) is provided with a hydraulic clamping mechanism (32) and a main centering piece (33), the hydraulic clamping mechanism (32) clamps the bar material to avoid material scratch, and the main centering piece (33) adjusts the center of the bar material to be consistent with the center of the turning piece (22); The right side of the lathe (1) is provided with a pushing piece (4) and a clamping vehicle (5), the pushing piece (4) drives the clamping vehicle (5) to clamp and move the bar material, and the limiting pieces (52) installed on the front and back of the clamping vehicle (5) effectively clamp and transport the bar material; The right end of the lathe (1) is provided with an extraction mechanism (6), the extraction mechanism (6) includes an extraction piece (62) and a secondary centering piece (63), the extraction piece (62) is lowered to extract the bar material under the adjustment of the secondary centering piece (63), and the main centering piece (33) and the secondary centering piece (63) have the same structure.

2. The car builder of claim 1 wherein: The turning piece (22) is installed at the front side inside the turning box (21), the driving piece (23) is installed at the rear side inside the turning box (21), the turning piece (22) includes a main shaft (221), a fixed bearing (223) and a gear disc (222), the fixed bearings (223) are installed on both sides of the main shaft (221) in the turning box (21), the gear disc (222) is installed at the center of the main shaft (221), the gear disc (222) is driven to rotate by the driving piece (23), and the turning disc (224) is installed at the left end of the main shaft (221).

3. The car builder of claim 1 wherein: The turning disc (224) includes an intermediate disc (2241), a cam disc (2242) and a cutter disc (2243), the cam disc (2242) is installed at the left end of the intermediate disc (2241), the intermediate disc (2241) is installed on the left wall of the main shaft (221), the cutter disc (2243) is installed at the left end of the cam disc (2242), four groups of guide rods (2244) are uniformly installed on the side of the cutter disc (2243), four groups of the guide rods (2244) are installed with cutting blades (2245), the guide rods (2244) and the cutting blades (2245) can be synchronously adjusted in the radial direction, a single group of the guide rods (2244) can be finely adjusted by using a cutter adjuster, and the intermediate disc (2241) and the gear disc (222) are made of high-strength wear-resistant steel.

4. The car builder of claim 1 wherein: The driving piece (23) includes a main motor (232) and a gear box (231), the gear box (231) is installed at the rear side of the turning box (21), the main motor (232) drives the gear box (231) to rotate, and the gear box (231) meshes with the gear disc (222) at the front end to rotate at high speed.

5. The car builder of claim 1 wherein: The hydraulic clamping mechanism (32) is installed in the pinch box (31), the center of the pinch box (31) is provided with installation cavities (311) on both sides, two groups of installation cavities (311) are communicated through the through grooves (312), and the top ends of the two groups of installation cavities (311) are provided with installation openings (313).

6. The car builder of claim 1 wherein: The hydraulic clamping mechanism (32) comprises four groups of first guide rails (321) and four groups of fixed blocks (322), the four groups of first guide rails (321) are fixed on the two walls of the two groups of installation cavities (311) respectively, the two groups of fixed blocks (322) are slidably arranged in the installation cavities (311) respectively, the centers of the four groups of fixed blocks (322) are provided with limiting bearings (323), the single group of limiting bearings (323) is provided with a driving shaft (324), the front ends of the single group of driving shafts (324) are provided with pinch rollers (325), the parallel two groups of fixed blocks (322) are connected through the connecting blocks (327), the top ends of the upper two groups of fixed blocks (322) are provided with first hydraulic cylinders (326), the rear ends of the horizontal two groups of driving shafts (324) are connected and synchronously rotated by using the chain wheel groups (328), and the rear ends of the right two groups of driving shafts (324) are provided with feeding motors (329).

7. The car builder of claim 1 wherein: The main centering piece (33) comprises an installation circular block (331) and a convex cylindrical (333), a convex cavity (332) is formed in the installation circular block (331), the convex cylindrical (333) is slidably arranged in the convex cavity (332), the bottom end of the convex cylindrical (333) is fixedly provided with a spring (334), and the spring (334) is arranged at the bottom end in the installation circular block (331).

8. The car builder of claim 1 wherein: The pushing piece (4) comprises a second servo motor (41) and a ball screw (43), the ball screw (43) is arranged at the right end of the front side of the lathe (1), the left end of the second servo motor (41) is provided with a speed reducer (42), the speed reducer (42) drives the ball screw (43) to rotate, the center of the ball screw (43) is threadedly provided with a silk cylinder (44), the top end of the silk cylinder (44) is provided with a connecting plate (45), the right end of the connecting plate (45) is connected with a moving frame (46), and the moving frame (46) is slidably arranged in the slide rail (47) at the bottom end.

9. The car builder of claim 1 wherein: The clamping vehicle (5) comprises a clamping box (51) and two mirror image limiting pieces (52), the clamping box (51) is arranged at the center of the moving frame (46), the limiting piece (52) comprises a side box (521) and a second guide rail (522), the second guide rail (522) is arranged on the front and rear walls in the side box (521), the U-shaped frame (523) is slidably arranged on the upper and lower sides of the two groups of second guide rails (522), the rubber roller (524) is arranged on the inner side of the two groups of U-shaped frames (523), the centers of the two groups of rubber rollers (524) are in contact with the bar material, and the outer sides of the two groups of U-shaped frames (523) are provided with the second hydraulic cylinders (525) for synchronous pushing.

10. The car builder of claim 1 wherein: The drawing-out piece (62) is installed on the left side of the inside of the drawing-out box (61), the inside bottom side of the drawing-out box (61) is installed with the auxiliary aligning piece (63), the drawing-out piece (62) includes two groups of third guide rails (621) and two groups of auxiliary mounting blocks (622), two groups of the third guide rails (621) are slidably installed with two groups of auxiliary mounting blocks (622), a group of the auxiliary mounting block (622) is installed with the auxiliary rotating shaft (623) rotating, the rear end of the upper side auxiliary rotating shaft (623) is installed with the third servo motor (624), and the front end of two groups of the auxiliary rotating shaft (623) is installed with the drawing-out roller (625).

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