Horizontal numerical control lathe

Abstract

The invention discloses a horizontal numerical control lathe and relates to the technical field of numerical control machine tools, the horizontal numerical control lathe comprises a machine base, a tool apron fixedly arranged on the machine base and a tailstock slidably arranged on the machine frame, a turning tool is installed on the tool apron, a rotating disc is rotatably arranged on the tailstock, and a motor used for driving the rotating disc to rotate is arranged on the tailstock. A turntable is arranged on the machine base, a workpiece clamping tool is arranged on the turntable, an auxiliary support is further arranged on the machine base in a sliding mode, a feeding mechanism used for driving the tailstock and the auxiliary support to slide is arranged on the machine base, and a positioning cavity used for allowing a workpiece to penetrate through is formed in the auxiliary support. And a plurality of positioning pieces for limiting radial deviation of the workpiece are arranged in the positioning cavity. By means of the turning tool, the stability of the workpiece during machining can be improved, the turning tool can conduct turning machining on the workpiece more accurately, and the machining precision and the machining quality are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of numerical control machine tools, in particular to a horizontal numerical control lathe. BACKGROUND

[0002] The horizontal numerical control lathe is a very important processing equipment, which occupies a key position in the manufacturing industry. With the continuous development of industry, the demand for horizontal numerical control lathes is increasing, and its application range is also becoming more and more widely, covering many fields such as aerospace, automobile manufacturing, mechanical part processing, etc. The development of horizontal numerical control lathes has brought significant value in improving production efficiency, ensuring processing precision, reducing labor intensity, etc., and has promoted the progress of the entire manufacturing industry.

[0003] The existing horizontal numerical control lathe is usually composed of a machine base, a tool holder fixed on the machine base, and a tailstock slidingly arranged on the machine frame. A turning tool is installed on the tool holder, a turntable is rotatably arranged on the tailstock, and a motor for driving the turntable to rotate is also provided on the tailstock, and a workpiece clamping tool is arranged on the turntable. This structure is a relatively common design of horizontal numerical control lathe, and its working principle is to drive the turntable to rotate by the motor, so that the workpiece rotates, and the tailstock moves, and the turning tool on the tool holder is used to cut the rotating workpiece.

[0004] However, when the existing horizontal numerical control lathe is used to process some long shaft parts, the workpiece is prone to radial deviation during processing, which affects the processing accuracy of multiple workpieces. SUMMARY

[0005] In view of the problems existing in the prior art, the present application provides a horizontal numerical control lathe.

[0006] The horizontal numerical control lathe provided by the present application adopts the following technical scheme: A horizontal numerical control lathe, comprising a machine base, a tool holder fixedly arranged on the machine base, and a tailstock slidingly arranged on the machine frame, a turning tool is installed on the tool holder, a turntable is rotatably arranged on the tailstock, a motor for driving the turntable to rotate is arranged on the tailstock, a workpiece clamping tool is arranged on the turntable, an auxiliary support is also slidingly arranged on the machine base, a feeding mechanism for driving the tailstock and the auxiliary support to slide is arranged on the machine base, a positioning cavity for the workpiece to pass through is arranged on the auxiliary support, and a plurality of positioning members for limiting the radial deviation of the workpiece are arranged in the positioning cavity.

[0007] Optionally, the auxiliary support comprises a bottom support slidingly arranged on the base, and a top support rotatably arranged on the bottom support, the feeding mechanism is configured to drive the bottom support to slide, the auxiliary support is provided with a fixing member configured to fix the top support, the bottom support and the top support jointly form the positioning cavity, and the bottom support and the top support are both provided with the positioning members.

[0008] Optionally, the positioning members comprise positioning rods, the positioning rods are installed on the top support or the bottom support, and the ends of the positioning rods are rotatably provided with rollers, the rollers are configured to rollingly connect with the surface of the workpiece.

[0009] Optionally, the positioning rods are slidingly arranged on the bottom support or the top support, and the bottom support and the top support are respectively provided with adjusting assemblies configured to adjust the positions of the positioning rods.

[0010] Optionally, the adjusting assemblies comprise mounting sleeves and adjusting screws, the mounting sleeves are fixedly arranged on the bottom support and the top support, the mounting sleeves correspond to the positioning rods, the positioning rods slidingly pass through the corresponding mounting sleeves, the adjusting screws rotatably pass through the mounting sleeves, and the adjusting screws are threadedly connected with the corresponding positioning rods.

[0011] Optionally, the feeding mechanism comprises a lead screw rotatably arranged on the base, and a servo motor fixedly arranged on the base and configured to drive the lead screw to rotate, the lead screw is threadedly connected with the tail frame, and the bottom support is provided with a threaded sleeve, the threaded sleeve is sleeved on the lead screw and threadedly connected with the lead screw.

[0012] Optionally, the bottom support is fixedly provided with a connecting block, the connecting block is provided with a mounting hole, the threaded sleeve passes through the mounting hole and is rotatably connected with the connecting block, and the connecting block is provided with a limiting assembly configured to prevent the threaded sleeve from rotating.

[0013] Optionally, the limiting assembly comprises a limiting block and a limiting member, the side wall of the mounting hole is provided with a receiving groove, the limiting block is slidingly arranged in the receiving groove, the limiting member is configured to prevent the limiting block from sliding, and the side wall of the threaded sleeve is provided with a clamping groove for the limiting block to insert.

[0014] Optionally, the limiting piece comprises a limiting screw, the limiting screw is arranged on the connecting block and threadedly matched with the connecting block, and the limiting screw extends into the accommodating groove, the end of the limiting block away from the end face of the threaded sleeve is provided with a sliding groove, a pressing rod is slidably arranged in the sliding groove, the side wall of the pressing rod is fixedly provided with an anti-falling block, the side wall of the sliding groove is provided with an anti-falling groove for sliding of the anti-falling block, the limiting screw is rotationally connected with the pressing rod, and the accommodating groove is provided with a buffer spring for enabling the limiting block to have a sliding trend towards the threaded sleeve.

[0015] Optionally, the end of the limiting block close to the threaded sleeve is provided with a guide wheel, and the guide wheel is used for rolling connection with the surface of the threaded sleeve.

[0016] In summary, the present application has at least one of the following beneficial technical effects: 1. The auxiliary support on the machine base can be slid, in the machining process of the horizontal numerical control lathe, the workpiece is installed on the workpiece clamping tool of the turntable, and the workpiece passes through the positioning cavity of the auxiliary support, the feeding mechanism on the machine base can drive the tailstock and the auxiliary support to slide, so that the workpiece is in contact with the turning tool on the tool holder, and the expected groove or hole can be cut on the end face of the workpiece. In the process of cutting the workpiece, the multiple positioning pieces in the positioning cavity can limit the radial deviation of the workpiece, avoid the workpiece from shaking during rotation, improve the stability of the workpiece during machining, make the turning tool more accurately turn the workpiece, and ensure the machining precision and machining quality.

[0017] 2. The positioning piece adopts a positioning support rod, and the end is provided with a roller in rolling connection with the surface of the workpiece. When limiting the radial deviation of the workpiece, the frictional damage to the surface of the workpiece can be reduced, the surface roughness of the workpiece can be reduced, and the machining quality can be improved.

[0018] 3. The present application can flexibly adjust the position of the positioning support rod by slidingly arranging the positioning support rod and cooperating with the adjusting assembly to adapt to the positioning needs of workpieces of different sizes.

[0019] 4. The present application sets the connecting block on the bottom support, rotationally connects the threaded sleeve with the connecting block, and sets a limiting assembly for limiting rotation of the threaded sleeve. When the limiting assembly cancels the limiting of the connecting block and the threaded sleeve, the rotation of the lead screw only drives the tailstock to move, thereby adjusting the distance between the tailstock and the auxiliary support to adapt to the machining needs of workpieces of different lengths, and further improving the practicality.

[0020] 5. The application sets a buffer spring in the accommodating groove, if the limiting block and the clamping groove on the threaded sleeve are not accurately aligned during the tightening process of the limiting screw, at this time, continue to tighten the limiting screw, the buffer spring can be compressed, the limiting block is pressed against the side wall of the threaded sleeve under the elastic force of the buffer spring, and always has a sliding trend to the direction close to the threaded sleeve, with the relative rotation between the threaded sleeve and the connecting block, when the limiting block and the clamping groove on the threaded sleeve are accurately aligned, the limiting block is automatically inserted into the clamping groove of the threaded sleeve under the elastic force of the buffer spring, the rotation limiting of the threaded sleeve is realized, and the convenience of operation is improved. Moreover, during the process of inserting the limiting block into the clamping groove to limit the threaded sleeve, the limiting block always has a sliding trend to the direction close to the threaded sleeve, which can avoid the disengagement of the limiting block from the clamping groove of the threaded sleeve due to machining vibration during the machining process, and improve the use reliability of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the embodiment of the application; Figure 2 is a structural cross-sectional view of the embodiment of the application; Figure 3 is a schematic diagram of the structure of the auxiliary support of the embodiment of the application; Figure 4 is a schematic diagram of the structure of the connecting block of the embodiment of the application.

[0022] Mark explanation: 1, machine base; 11, guide rail; 2, tool holder; 21, turning tool; 3, tailstock; 31, rotary table; 32, motor; 33, workpiece clamping tooling; 4, auxiliary support; 41, positioning cavity; 42, positioning member; 421, positioning support; 422, roller; 423, mounting sleeve; 424, adjusting screw; 43, bottom support; 44, top support; 45, fixing member; 46, threaded sleeve; 461, clamping groove; 47, connecting block; 471, mounting hole; 472, limiting block; 473, accommodating groove; 474, limiting screw; 475, sliding groove; 476, pressing rod; 477, buffer spring; 478, guide wheel; 5, feeding mechanism; 51, lead screw; 52, servo motor. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings Figure 1 - the accompanying drawings Figure 4 , the technical solutions in the embodiment of the application are clearly and completely described, the described embodiments are only possible technical implementations of the application, and not all possible implementations. Those skilled in the art can certainly combine the embodiments of the application without creative labor to obtain other embodiments, and these embodiments are also within the protection scope of the application.

[0024] The inventor of the present application finds that the existing horizontal numerical control lathe is prone to radial deviation of the workpiece during machining of some long shaft parts, affecting the machining precision of multiple workpieces. Therefore, the present application discloses a horizontal numerical control lathe, mainly adopting the following scheme: The embodiment of the present application discloses a horizontal numerical control lathe. Referring to Figure 1 and Figure 2 , including a base 1, a tool holder 2, a tailstock 3, an auxiliary support 4 and a feeding mechanism 5, wherein the tool holder 2 is fixedly arranged on the base 1, a turning tool 21 is installed on the tool holder 2, the tailstock 3 and the auxiliary support 4 are both slidingly arranged on the base 1, the feeding mechanism 5 is used to drive the tailstock 3 and the auxiliary support 4 to slide, a turntable 31 is rotatably arranged on the tailstock 3, an electric motor 32 for driving the turntable 31 to rotate is also arranged on the tailstock 3, a workpiece clamping tool 33 is arranged on the turntable 31, a positioning cavity 41 for the workpiece to pass through is arranged on the auxiliary support 4, and a plurality of positioning members 42 for limiting the radial deviation of the workpiece are arranged in the positioning cavity 41. Such cooperation enables the horizontal numerical control lathe to move the tailstock 3 and the auxiliary support 4 flexibly according to the machining requirements when machining the workpiece, the workpiece installed on the workpiece clamping tool 33 can be rotated by driving the turntable 31 to rotate by the electric motor 32, and the turning tool 21 on the tool holder 2 can cut and machine the rotating workpiece in cooperation with the movement of the tailstock 3. During the machining process, the positioning members 42 can effectively limit the radial deviation of the workpiece, avoid the workpiece from shaking during rotation, improve the stability of the workpiece during machining, enable the turning tool 21 to more accurately machine the workpiece, and ensure the machining precision and quality.

[0025] Referring to Figure 2 , specifically, a guide rail 11 is arranged on the base 1, the length direction of the guide rail 11 is parallel to the axial direction of the turntable 31, and the tailstock 3 and the auxiliary support 4 are both slidingly arranged on the guide rail 11, for positioning the sliding of the tailstock 3 and the auxiliary support 4.

[0026] Referring to Figure 2 and Figure 3Specifically, the auxiliary support 4 comprises a bottom support 43 and a top support 44, the bottom support 43 is slidingly arranged on the guide rail 11 of the machine base 1, the top support 44 is rotatably arranged above the bottom support 43, and when the bottom support 43 and the top support 44 are mutually buckled, the bottom support 43 and the top support 44 jointly form a positioning cavity 41, and the auxiliary support 4 is provided with a fixing piece 45 for fixing the top support 44. The bottom support 43 is usually made of metal material and has good strength and stability, the top support 44 is connected with the bottom support 43 through a hinge or other rotating structure, the opening and closing of the top support 44 are facilitated, and the installation and disassembly of the workpiece are facilitated. The fixing piece 45 can be a bolt, a buckle or the like, the top support 44 is fixed on the bottom support 43 through the fixing piece 45, and the stability of the positioning cavity 41 is ensured.

[0027] With reference to Figure 2 The bottom support 43 and the top support 44 are both provided with positioning pieces 42, and the total amount of the positioning pieces 42 is not less than three. Specifically, the positioning pieces 42 comprise positioning support rods 421, the positioning support rods 421 are installed on the top support 44 or the bottom support 43, and the end portions of the positioning support rods 421 are all rotatably provided with rollers 422, the rollers 422 are used for rolling connection with the surface of the workpiece. The positioning support rods 421 are generally made of high-strength steel material, so as to ensure that they can withstand a certain pressure. The surface of the roller 422 is usually polished, so as to reduce the friction with the surface of the workpiece. When the radial deviation of the workpiece is limited, the roller 422 is rolling connected with the surface of the workpiece, the friction damage to the surface of the workpiece is reduced, the surface roughness of the workpiece is reduced, and the machining quality is improved.

[0028] With reference to Figure 2 Further, the positioning support rods 421 are slidingly arranged on the bottom support 43 or the top support 44, and the bottom support 43 and the top support 44 are respectively provided with adjusting assemblies for adjusting the positions of the positioning support rods 421. Specifically, the adjusting assembly comprises an installation sleeve 423 and an adjusting screw 424, the installation sleeves 423 are fixedly arranged on the bottom support 43 and the top support 44, the installation sleeves 423 correspond to the positioning support rods 421, the positioning support rods 421 slidingly pass through the corresponding installation sleeves 423, the adjusting screws 424 are rotatably arranged in the installation sleeves 423, and the adjusting screws 424 are in threaded connection with the corresponding positioning support rods 421. The installation sleeve 423 is generally made of metal material, and the inner wall thereof is smooth, so as to ensure that the positioning support rod 421 can smoothly slide in the installation sleeve 423. By rotating the adjusting screw 424, the positioning support rod 421 can slide in the installation sleeve 423, so as to adjust the position of the positioning support rod 421, so as to adapt to the positioning requirements of workpieces of different sizes. In addition, the adjusting assembly can also adopt a power component such as an electric push rod, and the position of the positioning support rod 421 is automatically adjusted through electric control, so as to improve the accuracy and efficiency of the adjustment.

[0029] With reference to Figure 1 And Figure 3 , the feeding mechanism 5 includes a screw rod 51 rotatably arranged on the base 1, and a servo motor 52 fixedly arranged on the base 1 for driving the screw rod 51 to rotate, and the screw rod 51 is arranged through the tailstock 3 and is threadedly connected with the tailstock 3, and a threaded sleeve 46 is arranged on the bottom support 43, and the threaded sleeve 46 is sleeved on the screw rod 51 and threadedly cooperates with the screw rod 51. The screw rod 51 is usually a high-precision ball screw rod 51, which has high transmission efficiency and precision. The servo motor 52 can accurately control the rotating speed and direction of the screw rod 51, so as to realize the accurate movement of the tailstock 3 and the bottom support 43.

[0030] With reference to Figure 3 And Figure 4 , specifically, the bottom support 43 is fixedly provided with a connecting block 47, the connecting block 47 is provided with a mounting hole 471, the threaded sleeve 46 is arranged through the mounting hole 471 and is rotatably connected with the connecting block 47, and the connecting block 47 is provided with a limiting assembly for preventing the threaded sleeve 46 from rotating. The connecting block 47 is usually fixed on the bottom support 43 by welding or bolt connection, so as to ensure the stability of the connection. The threaded sleeve 46 and the connecting block 47 are connected through a bearing, so as to ensure that the threaded sleeve 46 can freely rotate in the mounting hole 471, and at the same time, the axial displacement of the threaded sleeve 46 in the mounting hole 471 is limited. The limiting assembly can control the rotation of the threaded sleeve 46 according to the processing requirements. When the rotation of the threaded sleeve 46 is cancelled through the limiting assembly, the rotation of the screw rod 51 only drives the movement of the tailstock 3, so as to adjust the distance between the tailstock 3 and the auxiliary support 4, so as to adapt to the processing requirements of workpieces of different lengths. When the tailstock 3 and the auxiliary support 4 need to move synchronously, the rotation of the threaded sleeve 46 is prevented through the limiting assembly, so that the rotation of the screw rod 51 drives the synchronous movement of the tailstock 3 and the bottom support 43.

[0031] With reference to Figure 4 The limiting assembly includes a limiting block 472 and a limiting piece, a side wall of the mounting hole 471 is provided with a containing groove 473, the limiting block 472 is slidably arranged in the containing groove 473, the limiting piece is used for preventing the limiting block 472 from sliding, and a side wall of the threaded sleeve 46 is provided with a clamping groove 461 for inserting the limiting block 472. The size of the containing groove 473 is matched with the limiting block 472, so as to ensure that the limiting block 472 can smoothly slide in the containing groove 473. The position and size of the clamping groove 461 correspond to the limiting block 472, and when the limiting block 472 is inserted into the clamping groove 461, the rotation of the threaded sleeve 46 can be effectively prevented.

[0032] With reference to Figure 4The limiting member includes a limiting screw 474 which is arranged through the connecting block 47 and threadedly cooperates with the connecting block 47, and extends into the accommodating groove 473. The limiting block 472 is provided with a sliding groove 475 which is arranged away from the end face of the threaded sleeve 46. A pressing rod 476 is slidably arranged in the sliding groove 475. The side wall of the pressing rod 476 is fixedly provided with an anti-falling block. The side wall of the sliding groove 475 is provided with an anti-falling groove for the anti-falling block to slide. The limiting screw 474 is rotationally connected with the pressing rod 476. A buffer spring 477 is arranged in the accommodating groove 473 and is sleeved on the limiting screw 474, and is used to make the limiting block 472 have a sliding trend towards the threaded sleeve 46. The end of the limiting screw 474 is provided with a handle, which facilitates the rotation of the limiting screw 474 by the operator. The cooperation between the pressing rod 476 and the limiting block 472 through the anti-falling block and the anti-falling groove ensures that the pressing rod 476 will not fall off the limiting block 472 when sliding in the sliding groove 475. One end of the buffer spring 477 abuts against the bottom of the accommodating groove 473, and the other end abuts against the limiting block 472. When the limiting screw 474 is tightened, if the limiting block 472 is not accurately aligned with the clamping groove 461 on the threaded sleeve 46, at this time, the limiting screw 474 is continuously tightened, so that the buffer spring 477 is compressed, the limiting block 472 abuts against the side wall of the threaded sleeve 46 under the elastic force of the buffer spring 477, and always has a sliding trend towards the threaded sleeve 46. With the relative rotation between the threaded sleeve 46 and the connecting block 47, when the limiting block 472 is accurately aligned with the clamping groove 461 on the threaded sleeve 46, the limiting block 472 is automatically inserted into the clamping groove 461 of the threaded sleeve 46 under the elastic force of the buffer spring 477, so as to realize the rotation limiting of the threaded sleeve 46 and improve the convenience of operation.

[0033] Moreover, during the process of limiting the threaded sleeve 46 by inserting the limiting block 472 into the clamping groove 461, the limiting block 472 always has a sliding trend towards the threaded sleeve 46, so that the limiting block 472 can be prevented from falling off the clamping groove 461 of the threaded sleeve 46 due to machining vibration during machining, and the use reliability of the equipment is improved. The limiting member can also be a hydraulic cylinder or the like, and the sliding of the limiting block 472 is controlled by the pressure of hydraulic oil, so as to realize more accurate control.

[0034] In addition, the limiting member can also be an electromagnet which is electrically controlled; the electromagnet is used to control the sliding of the limiting block 472 by electromagnetic force, so as to realize automatic control.

[0035] With reference to Figure 4Further, the limit block 472 is provided with a guide wheel 478 near the end of the threaded sleeve 46, the guide wheel 478 is installed on the end of the limit block 472 through a shaft, so that the guide wheel 478 can rotate freely on the end of the limit block 472. The surface of the guide wheel 478 is usually polished to reduce friction with the surface of the threaded sleeve 46. During the movement of the limit block 472 to the threaded sleeve 46, the guide wheel 478 is in rolling connection with the surface of the threaded sleeve 46, which can reduce the friction between the limit block 472 and the threaded sleeve 46, making it easier for the limit block 472 to be inserted into the clamping groove 461, and also reducing the damage to the surface of the threaded sleeve 46. The guide wheel 478 can also be replaced by a rolling component such as a ball, further reducing friction.

[0036] The implementation principle of the horizontal numerical control lathe is: the auxiliary support 4 is arranged on the machine base 1, the workpiece is installed on the workpiece clamping tool 33 of the turntable 31 during the machining process of the horizontal numerical control lathe, and the workpiece passes through the positioning cavity 41 of the auxiliary support 4, the feeding mechanism 5 on the machine base 1 can drive the tailstock 3 and the auxiliary support 4 to slide, so that the workpiece is in contact with the turning tool 21 on the tool holder 2, and the expected groove or hole can be cut on the end face of the workpiece. During the cutting process of the workpiece, the radial deviation of the workpiece can be limited by the plurality of positioning members 42 in the positioning cavity 41, so as to avoid the shaking of the workpiece during rotation, improve the stability of the workpiece during machining, and enable the turning tool 21 to more accurately machine the workpiece, thereby ensuring the machining precision and machining quality. At the same time, through the setting of the adjusting assembly and the limiting assembly, the horizontal numerical control lathe can adapt to the machining requirements of workpieces of different sizes and lengths, and the universality and practicality of the equipment are improved. Compared with the prior art, the horizontal numerical control lathe of the embodiment has been significantly improved in machining precision, universality and practicality, and provides stronger support for the development of the manufacturing industry.

[0037] The above are preferred embodiments of the present application, but do not limit the protection scope of the present application, therefore: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A horizontal CNC lathe, comprising a machine base (1), a tool holder (2) fixedly mounted on the machine base (1), and a tailstock (3) slidably mounted on the machine frame, wherein a cutting tool (21) is mounted on the tool holder (2), a turntable (31) is rotatably mounted on the tailstock (3), a motor (32) for driving the turntable (31) to rotate is mounted on the tailstock (3), and a workpiece clamping fixture (33) is mounted on the turntable (31), characterized in that: The auxiliary support (4) is slidably arranged on the base (1), and the base (1) is provided with a feeding mechanism (5) for driving the tailstock (3) and the auxiliary support (4) to slide; the auxiliary support (4) is provided with a positioning cavity (41) for the workpiece to pass through, and a plurality of positioning members (42) for limiting the radial deviation of the workpiece are arranged in the positioning cavity (41).

2. The horizontal CNC lathe according to claim 1, characterized in that: The auxiliary support (4) comprises a bottom support (43) slidably arranged on the base (1) and a top support (44) rotatably arranged on the bottom support (43); the feeding mechanism (5) is used for driving the bottom support (43) to slide; the auxiliary support (4) is provided with a fixing member (45) for fixing the top support (44); the bottom support (43) and the top support (44) jointly form the positioning cavity (41); and the bottom support (43) and the top support (44) are both provided with the positioning members (42).

3. The horizontal CNC lathe according to claim 2, characterized in that: The positioning member (42) comprises a positioning support rod (421), the positioning support rod (421) is mounted on the top support (44) or the bottom support (43), and the end of each positioning support rod (421) is rotatably provided with a roller (422) for rolling connection with the surface of the workpiece.

4. The horizontal CNC lathe according to claim 3, characterized in that: The positioning support rod (421) is slidably arranged on the bottom support (43) or the top support (44), and the bottom support (43) and the top support (44) are respectively provided with an adjusting assembly for adjusting the position of each positioning support rod (421).

5. The horizontal CNC lathe according to claim 4, characterized in that: The adjusting assembly comprises a mounting sleeve (423) and an adjusting screw (424); the mounting sleeve (423) is fixedly arranged on the bottom support (43) and the top support (44) and corresponds to the positioning support rod (421); the positioning support rod (421) slides through the corresponding mounting sleeve (423); and the adjusting screw (424) is rotatably arranged in each mounting sleeve (423) and is in threaded connection with the corresponding positioning support rod (421).

6. The horizontal CNC lathe according to claim 2, characterized in that: The feeding mechanism (5) comprises a lead screw (51) rotatably arranged on the base (1) and a servo motor (52) fixedly arranged on the base (1) and used for driving the lead screw (51) to rotate; the lead screw (51) is in threaded connection with the tailstock (3); and the bottom support (43) is provided with a threaded sleeve (46) sleeved on the lead screw (51) and in threaded connection with the lead screw (51).

7. A horizontal CNC lathe according to claim 6, characterized in that: The bottom support (43) is fixedly provided with a connecting block (47), the connecting block (47) is provided with a mounting hole (471), the threaded sleeve (46) passes through the mounting hole (471) and is rotatably connected with the connecting block (47), and the connecting block (47) is provided with a limiting assembly for preventing the threaded sleeve (46) from rotating.

8. The horizontal CNC lathe according to claim 7, characterized in that: The limiting assembly comprises a limiting block (472) and a limiting piece, a side wall of the mounting hole (471) is provided with a containing groove (473), the limiting block (472) is slidingly arranged in the containing groove (473), and the limiting piece is used for preventing the limiting block (472) from sliding.

9. A horizontal CNC lathe according to claim 8, characterized in that: The limiting piece comprises a limiting screw (474), the limiting screw (474) is arranged on the connecting block (47) and is in threaded cooperation with the connecting block (47), the limiting screw (474) extends into the containing groove (473), an end face of the limiting block (472) away from the threaded sleeve (46) is provided with a sliding groove (475), a press rod (476) is slidingly arranged in the sliding groove (475), a side wall of the press rod (476) is fixedly provided with an anti-falling block, a side wall of the sliding groove (475) is provided with an anti-falling groove for sliding of the anti-falling block, the limiting screw (474) is rotationally connected with the press rod (476), and the containing groove (473) is provided with a buffer spring (477) for enabling the limiting block (472) to have a sliding trend in a direction close to the threaded sleeve (46).

10. The horizontal CNC lathe according to claim 9, characterized in that: An end portion of the limiting block (472) close to the threaded sleeve (46) is provided with a guide wheel (478), and the guide wheel (478) is used for being in rolling connection with a surface of the threaded sleeve (46).

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