Numerical control lathe for precision machining and machining method thereof

Abstract

The invention provides a precision machining numerical control lathe and a machining method thereof, and relates to the technical field of lathe machining, and the precision machining numerical control lathe comprises a lathe body, a three-jaw chuck, a first tool rest, a second tool rest, a coaxial cylinder and a stabilizing structure. By designing the coaxial barrel body and the stable structure, the cylindrical workpiece rotates and axially slides on the inner side of the stable structure, the whole cylindrical workpiece can be clamped, the preposed cutting process is not needed, and therefore the machining efficiency can be improved, turning is completed through one of the first tool rest and the second tool rest, cutting is completed through the other tool rest, and the machining efficiency is improved. And then the cylindrical workpiece is pushed forwards, one end of the cylindrical workpiece is clamped and fixed through the three-jaw chuck, and then the next workpiece can be machined, so that the machining efficiency can be greatly improved, the workload of operators is small, the risk of misoperation is reduced, and the turning task of the short-shaft workpieces is efficiently and stably completed.

Description

Technical Field

[0001] The invention relates to the technical field of lathe processing, in particular to a precision processing numerically controlled lathe and a processing method thereof. Background Art

[0002] A CNC lathe is a high-precision, high-efficiency automated machine tool that controls the movement and operation of the machine tool through a computer program to achieve processing of workpieces. The basic components of a CNC lathe include the machine tool body, drive system, transmission system, control system, etc.

[0003] When a lathe processes short-shaft workpieces, it generally includes two processes, cutting and turning. The most important factor affecting the processing efficiency of short-shaft workpieces is the clamping time. Frequent clamping will also increase the workload of the operator, and misoperation often occurs. For this reason, the present invention provides a precision machining CNC lathe and a machining method thereof. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a precision machining CNC lathe and a machining method thereof, which solve the problems of low machining efficiency and heavy workload for operators when the lathe is used to machine short-shaft workpieces.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A CNC lathe for precision machining, comprising:

[0007] A lathe body, a three-jaw chuck is fixedly mounted on the main shaft of the lathe body, a tool rest moving assembly is mounted on the bed of the lathe body, and a tool rest is mounted on the tool rest moving assembly;

[0008] The tool holder comprises: a first tool holder and a second tool holder;

[0009] A vertical plate is fixedly mounted on the bed of the lathe body and at one end away from the three-jaw chuck, a coaxial cylinder is fixedly mounted on the vertical plate, and stable structures are fixedly arranged at both ends of the coaxial cylinder, and the cylindrical workpiece rotates and slides axially on the inner side of the stable structure.

[0010] Further preferably, it further comprises: a feeding assembly, the feeding assembly being fixedly mounted on the bed of the lathe body and away from one end of the three-jaw chuck;

[0011] The feeding assembly comprises:

[0012] A transverse telescopic member, wherein the transverse telescopic member is arranged horizontally, and one end of the transverse telescopic member is fixedly connected to the bed of the lathe body;

[0013] An inverted T-shaped frame, wherein the inverted T-shaped frame is fixedly mounted on the telescopic end of the transverse telescopic member, and a T-shaped slide groove is provided on the top of the inverted T-shaped frame;

[0014] A first clamping jaw and a second clamping jaw, wherein the first clamping jaw and the second clamping jaw are both slidably mounted on the T-shaped slide groove, and the first clamping jaw and the second clamping jaw are located on both sides of the cylindrical workpiece, and a two-way telescopic component is fixedly mounted on the inverted T-shaped frame, and the two telescopic ends of the two-way telescopic component are respectively fixedly mounted on the first clamping jaw and the second clamping jaw.

[0015] Further preferably, a turning tool is fixedly mounted on the second tool holder, a cutting tool is fixedly mounted on the first tool holder, and the second tool holder is close to one side of the three-jaw chuck.

[0016] Further preferably, the tool holder moving assembly comprises: a transverse polished rod, a transverse screw rod, and a first servo motor, both ends of the transverse polished rod are fixedly mounted on the bed of the lathe body, the transverse screw rod is rotatably mounted on the bed of the lathe body, the first servo motor is fixedly mounted on the bed of the lathe body, and the output end of the first servo motor is transmission-connected to the transverse screw rod;

[0017] The first tool holder comprises: a cross frame seat, the cross frame seat is threadedly matched with the transverse screw rod, and the cross frame seat is slidingly matched with the transverse polished rod.

[0018] Further preferably, a longitudinal smooth rod is fixedly installed on the top of the cross frame seat, a longitudinal screw rod is rotatably installed on the top of the cross frame seat, a second servo motor is fixedly installed on the side of the cross frame seat, the output end of the second servo motor is transmission connected to the longitudinal screw rod, a knife seat is slidably installed on the longitudinal smooth rod, and the knife seat is threadedly matched with the longitudinal screw rod.

[0019] Further preferably, the coaxial cylinder includes: a transverse cylinder, the transverse cylinder is slidably mounted on the vertical plate, an annular flange is fixedly mounted on the outer side of the transverse cylinder, a plurality of groups of adjustable telescopic parts are fixedly connected to the side of the vertical plate, the plurality of groups of adjustable telescopic parts are distributed in a circular array, and the telescopic ends of the adjustable telescopic parts are fixedly connected to the annular flange.

[0020] A processing method of a precision machining CNC lathe, using the above-mentioned precision machining CNC lathe, comprises the following steps:

[0021] S1. Pass the cylindrical workpiece through the coaxial cylinder, stabilize the cylindrical workpiece by relying on the stable structures at both ends of the coaxial cylinder, and clamp one end of the cylindrical workpiece with a three-jaw chuck;

[0022] S2, the main shaft of the lathe body drives the three-jaw chuck and the cylindrical workpiece to rotate, controls one of the first tool rest and the second tool rest to complete turning, and then controls the other of the first tool rest and the second tool rest to complete cutting, and removes the processed workpiece;

[0023] S3, push the cylindrical workpiece forward so that one end of the cylindrical workpiece is clamped and fixed by the three-jaw chuck, and then repeat step S2.

[0024] Further preferably, in step S2, the tool holder completing the turning includes: using the tool on the tool holder to turn the tail of the previous workpiece and using the tool on the tool holder to turn the front of the next workpiece.

[0025] The present invention provides a precision machining CNC lathe and a machining method thereof, which have the following beneficial effects:

[0026] 1. The present invention, by designing a coaxial cylinder and a stable structure, allows the cylindrical workpiece to rotate and slide axially on the inner side of the stable structure, so that the entire cylindrical workpiece can be clamped, and no pre-cutting process is required, thereby improving processing efficiency. One of the first and second tool holders is used to complete turning, and the other tool holder is used to complete cutting. After that, the cylindrical workpiece is pushed forward, and one end of the cylindrical workpiece is clamped and fixed by a three-jaw chuck, and then the next workpiece can be processed. Compared with the traditional processing of short-axis workpieces, which adopts the method of first segmenting and then clamping and turning, the present invention can greatly improve the processing efficiency, and the workload of the operator is small, reducing the risk of misoperation, thereby efficiently and stably completing the turning processing task of short-axis workpieces.

[0027] 2. The present invention, by designing a feeding assembly, is used to push the cylindrical workpiece forward, thereby realizing fully automated workpiece clamping and continuously completing the turning of multiple short-shaft workpieces, further reducing the workload of operators and improving processing efficiency.

[0028] 3. The present invention, by providing a plurality of groups of brackets distributed in an annular array, can synchronously slide and adjust along the radial direction of the outer disk body, so as to adapt to the turning processing of cylindrical workpieces with different outer diameters, and by utilizing a freely rolling ball, it is possible to stabilize the cylindrical workpiece while ensuring that the cylindrical workpiece can rotate and slide axially. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A first-perspective stereoscopic view of a precision machining CNC lathe proposed by the present invention;

[0030] Figure 2 A second perspective stereogram of a precision machining CNC lathe proposed by the present invention;

[0031] Figure 3 for Figure 2 A partial enlarged view in the middle;

[0032] Figure 4 A front view of a CNC lathe for precision machining proposed by the present invention;

[0033] Figure 5 A three-dimensional schematic diagram of a tool holder assembly of a precision machining CNC lathe proposed by the present invention;

[0034] Figure 6 An exploded view of a stable structure of a precision machining CNC lathe proposed by the present invention;

[0035] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0036] Figure 8 This is a three-dimensional view of a bracket of a precision-machined CNC lathe proposed by the present invention.

[0037] Among them, 1. lathe body; 2. three-jaw chuck; 3. tool holder moving assembly; 301. transverse polished rod; 302. transverse screw rod; 303. first servo motor; 4. first tool holder; 401. transverse frame seat; 402. longitudinal polished rod; 403. longitudinal screw rod; 404. second servo motor; 405. tool holder; 5. second tool holder; 6. vertical plate; 7. coaxial cylinder; 701. transverse cylinder; 702. annular flange; 703. adjusting telescopic member; 8. stable structure; 801. outer disc body; 802 , guide plate; 803, bracket; 803a, rod body; 803b, vertical axis; 803c, top seat; 803d, sphere; 803e, round seat; 803f, ring cap; 804, cover plate; 805, screw; 806, position adjustment ring; 807, ramp; 808, fastening seat; 809, notch; 9, feeding assembly; 901, horizontal telescopic member; 902, inverted T-shaped frame; 903, first clamping jaw; 904, second clamping jaw; 905, two-way telescopic member; 10, cylindrical workpiece. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1:

[0040] like Figure 1-Figure 8As shown, an embodiment of the present invention provides a CNC lathe for precision machining, comprising: a lathe body 1, a three-jaw chuck 2, a tool holder moving assembly 3, a tool holder, a coaxial cylinder 7 and a stabilizing structure 8.

[0041] The lathe body 1 has a spindle box, and the spindle of the lathe body 1 is driven by a servo motor to rotate. A three-jaw chuck 2 is fixedly installed on the spindle of the lathe body 1, and a tool holder moving assembly 3 is installed on the bed of the lathe body 1. The tool holder moving assembly 3 is installed with a tool holder. The tool holder moving assembly 3 is used to drive the tool holder to move along the axial direction of the cylindrical workpiece 10 (turning movement). The tool holder itself has a longitudinal movement (feed movement) perpendicular to the axial direction of the cylindrical workpiece 10. The turning of the cylindrical workpiece 10 is completed under the cooperation of the tool holder moving assembly 3 and the moving mechanism of the tool holder itself.

[0042] Among them, the tool holder includes: a first tool holder 4 and a second tool holder 5. The first tool holder 4 and the second tool holder 5 are synchronously driven and moved by the tool holder moving assembly 3. A vertical plate 6 is fixedly installed on the bed of the lathe body 1 and at one end away from the three-jaw chuck 2. A coaxial cylinder 7 is fixedly installed on the vertical plate 6. Both ends of the coaxial cylinder 7 are fixedly provided with a stabilizing structure 8. The two sets of stabilizing structures 8 can better stabilize the cylindrical workpiece 10. The cylindrical workpiece 10 rotates and slides axially on the inner side of the stabilizing structure 8.

[0043] The above structure is designed to enable efficient and stable processing of short-axis workpieces. For example, a cylindrical workpiece 10 capable of processing 10 groups of short-axis workpieces is installed in a coaxial cylinder 7, and the two groups of stabilizing structures 8 at both ends of the coaxial cylinder 7 are used to stabilize the cylindrical workpiece 10, and one end of the cylindrical workpiece 10 is fixedly clamped on the three-jaw chuck 2, and the second tool holder 5 cooperates with the tool holder moving assembly 3 to complete the turning of the workpiece, and then the first tool holder 4 cooperates with the tool holder moving assembly 3 to complete the cutting of the workpiece, the spindle of the lathe body 1 is stopped, the processed workpiece is removed, and then the remaining cylindrical workpiece 10 is pushed forward, and one end of the cylindrical workpiece 10 is fixedly clamped on the three-jaw chuck 2, and the above turning and cutting are repeated, so as to efficiently and stably process short-axis workpieces.

[0044] The above structure is designed to enable high-precision processing of long-axis workpieces. For example, a cylindrical workpiece 10 is installed in a coaxial cylinder 7, and two sets of stabilizing structures 8 at both ends of the coaxial cylinder 7 are used to stabilize the cylindrical workpiece 10. One end of the cylindrical workpiece 10 is fixedly clamped on a three-jaw chuck 2. The two sets of stabilizing structures 8 can reduce the radial runout of the cylindrical workpiece 10 during rotation, thereby achieving high-precision processing of the workpiece.

[0045] In one embodiment, in order to process short-shaft workpieces more efficiently and automatically, a feeding assembly 9 is designed. The feeding assembly 9 is fixedly mounted on the bed of the lathe body 1 and away from one end of the three-jaw chuck 2. The feeding assembly 9 is used to clamp and push the cylindrical workpiece 10 to move.

[0046] Specifically, the feeding assembly 9 includes: a transverse telescopic member 901, an inverted T-shaped frame 902, a first clamp 903, a second clamp 904 and a bidirectional telescopic member 905. The bidirectional telescopic member 905 and the transverse telescopic member 901 are controlled by the CNC control end of the lathe body 1. The bidirectional telescopic member 905 and the transverse telescopic member 901 preferably adopt an electric structure, such as a linear motor.

[0047] The transverse telescopic member 901 is arranged horizontally, and the transverse telescopic member 901 is parallel to the length direction of the cylindrical workpiece 10. One end of the transverse telescopic member 901 is fixedly connected to the bed of the lathe body 1, and the other end of the transverse telescopic member 901 is a free telescopic end. The inverted T-shaped frame 902 is fixedly installed on the telescopic end of the transverse telescopic member 901. A T-shaped slide groove is arranged on the top of the inverted T-shaped frame 902. The first clamping jaw 903 and the second clamping jaw 904 are both slidably installed with the T-shaped slide groove, and the first clamping jaw 903 and the second clamping jaw 904 are located on both sides of the cylindrical workpiece 10. A bidirectional telescopic member 905 is fixedly installed on the inverted T-shaped frame 902, and the two telescopic ends of the bidirectional telescopic member 905 are respectively fixedly installed with the first clamping jaw 903 and the second clamping jaw 904.

[0048] When the feeding assembly 9 is working, it is necessary to first control the transverse telescopic member 901 to push outward, so as to push the inverted T-shaped frame 902, the first clamping jaw 903, the second clamping jaw 904 and the two-way telescopic member 905 as a whole to the far end position, and then the two-way telescopic member 905 drives the first clamping jaw 903 and the second clamping jaw 904 to move toward the center, so that the first clamping jaw 903 and the second clamping jaw 904 clamp and fix the cylindrical workpiece 10, and then control the transverse telescopic member 901 to pull inward, so that the inverted T-shaped frame 902, the first clamping jaw 903, the second clamping jaw 904 and the two-way telescopic member 905 are pulled to the proximal end as a whole, and this process also pulls the cylindrical workpiece 10 to a certain length, and then the two-way telescopic member 905 pushes the first clamping jaw 903 and the second clamping jaw 904 to move outward to release the clamping of the cylindrical workpiece 10.

[0049] In one embodiment, a turning tool is fixedly mounted on the second tool holder 5, and the turning tool is used to turn the cylindrical workpiece 10. A cutting tool is fixedly mounted on the first tool holder 4, and the cutting tool is used to cut the cylindrical workpiece 10. The second tool holder 5 is close to one side of the three-jaw chuck 2. The first tool holder 4 has the same structure as the second tool holder 5. The difference lies in the positions of the first tool holder 4 and the second tool holder 5 and the tools installed on the first tool holder 4 and the second tool holder 5. The first tool holder 4 and the second tool holder 5 rely on the tools installed thereon to achieve the corresponding turning purposes.

[0050] In one embodiment, the tool holder moving assembly 3 includes: a transverse light rod 301, a transverse screw rod 302, and a first servo motor 303. The two ends of the transverse light rod 301 are fixedly installed on the bed of the lathe body 1, the transverse screw rod 302 is rotatably installed on the bed of the lathe body 1, the transverse light rod 301 and the transverse screw rod 302 are arranged in parallel, the first servo motor 303 is fixedly installed on the bed of the lathe body 1, and the output end of the first servo motor 303 is transmission-connected to the transverse screw rod 302.

[0051] The output shaft of the first servo motor 303 is parallel to the transverse screw rod 302 , and a synchronous belt wheel or a gear set can be used for transmission therebetween. The first servo motor 303 drives the transverse screw rod 302 to rotate.

[0052] The first tool holder 4 has the same structure as the second tool holder 5 , and the structure of the first tool holder 4 is specifically described in detail below. The first tool holder 4 includes: a cross frame seat 401 , the cross frame seat 401 is threadedly matched with the transverse screw rod 302 , and the cross frame seat 401 is slidably matched with the transverse polished rod 301 .

[0053] The transverse polished rod 301 guides the transverse frame seat 401 . The first servo motor 303 drives the transverse screw rod 302 to rotate. The transverse frame seat 401 and the transverse screw rod 302 are threadedly matched, so the transverse frame seat 401 can be driven to slide linearly along the axial direction of the transverse polished rod 301 .

[0054] In one embodiment, a longitudinal light rod 402 is fixedly installed on the top of the cross frame seat 401, and a longitudinal screw rod 403 is rotatably installed on the top of the cross frame seat 401. The longitudinal light rod 402 is parallel to the longitudinal screw rod 403. A second servo motor 404 is fixedly installed on the side of the cross frame seat 401. The output end of the second servo motor 404 is transmission connected to the longitudinal screw rod 403. A tool holder 405 is slidably installed on the longitudinal light rod 402, and a tool can be fixedly installed on the tool holder 405. The tool holder 405 is threadedly engaged with the longitudinal screw rod 403.

[0055] The output shaft of the second servo motor 404 is parallel to the longitudinal screw rod 403, and the output shaft of the second servo motor 404 is connected to the longitudinal screw rod 403 through a synchronous belt or gear transmission. The second servo motor 404 drives the longitudinal screw rod 403 to rotate, and a threaded fit movement occurs between the longitudinal screw rod 403 and the tool holder 405, and under the guidance of the longitudinal light rod 402, the tool holder 405 can move longitudinally.

[0056] In one embodiment, the coaxial cylinder 7 includes: a transverse cylinder 701, the transverse cylinder 701 is slidably installed with the vertical plate 6, an annular flange 702 is fixedly installed on the outer side of the transverse cylinder 701, and a plurality of sets of adjustable telescopic parts 703 are fixedly connected to the side of the vertical plate 6, and the plurality of sets of adjustable telescopic parts 703 are distributed in a circular array, and the telescopic ends of the adjustable telescopic parts 703 are fixedly connected to the annular flange 702.

[0057] The adjusting telescopic member 703 is an electric telescopic member, and the adjusting telescopic member 703 drives the entire transverse cylinder 701 to slide relative to the vertical plate 6 , thereby achieving the purpose of adjusting the position of the stabilizing structures 8 at both ends of the transverse cylinder 701 .

[0058] In one embodiment, the stabilizing structure 8 includes: an outer disk 801 , a bracket 803 , a cover disk 804 , an adjustment ring 806 and a fastening seat 808 .

[0059] The outer disc 801 is fixedly connected to the end of the transverse cylinder 701, and a plurality of brackets 803 are installed on the end of the outer disc 801 along the radial direction of the outer disc 801. The plurality of brackets 803 are arranged in a circular array, and the inner ends of the plurality of brackets 803 form a circle, the center of which coincides with the center of the transverse cylinder 701. A cover disc 804 is fixedly installed on the outer side of the outer disc 801 by means of screws 805. The screws 805 are passed through the cover disc 804, and one end of the screws 805 is threadedly connected to the outer disc 801. The outer side of the transverse cylinder 701 A position adjustment ring 806 is rotatably installed, and a ramp 807 is provided on the side of the position adjustment ring 806. The side of the bracket 803 has a vertical axis 803b, and the vertical axis 803b slides on the inner side of the ramp 807. By rotating the position adjustment ring 806, the size of the circle formed by the inner ends of several groups of brackets 803 can be adjusted. The outer side of the transverse cylinder 701 is threadedly connected with a fastening seat 808, and the position adjustment ring 806 is located between the fastening seat 808 and the outer disk body 801. By screwing the fastening seat 808, the position of the position adjustment ring 806 can be fixed.

[0060] When the position adjustment ring 806 is rotated, the vertical axis 803b slides on the inner side of the ramp 807. Since the direction of the ramp 807 is designed to be inclined, the distances between each position and the center of the transverse cylinder 701 are different, thereby pushing several groups of brackets 803 to slide synchronously along the radial direction of the transverse cylinder 701, so that the diameters of the circles formed by the inner ends of several groups of brackets 803 can be adjusted, thereby using cylindrical workpieces 10 with different diameters.

[0061] Specifically, the bracket 803 includes: a rod body 803a, a guide plate 802 is fixedly installed on the side of the outer disk body 801, the rod body 803a and the guide plate 802 are slidably matched, a notch 809 is provided on the side of the cover disk 804, the rod body 803a and the notch 809 are slidably matched, the outer end of the rod body 803a is fixedly connected with a vertical axis 803b, the inner end of the rod body 803a is fixedly connected with a top seat 803c, the end of the top seat 803c is provided with a round seat 803e, the interior of the round seat 803e is provided with a ball 803d, the outer side of the top seat 803c is threadedly installed with a ring cap 803f, the ring cap 803f limits the ball 803d from leaving the round seat 803e, the cylindrical workpiece 10 is located at the inner end of the bracket 803, that is, the ball 803d is against the outer side of the cylindrical workpiece 10, and since the ball 803d can rotate freely, the cylindrical workpiece 10 can rotate and slide axially.

[0062] Embodiment 2:

[0063] A processing method for a precision machining CNC lathe, using the precision machining CNC lathe of any one of the first embodiments, comprising the following steps:

[0064] S1. Pass the cylindrical workpiece through the coaxial cylinder, stabilize the cylindrical workpiece by relying on the stable structures at both ends of the coaxial cylinder, and clamp one end of the cylindrical workpiece with a three-jaw chuck.

[0065] A cylindrical workpiece refers to a raw material workpiece whose length is sufficient to produce and process multiple short-axis workpieces.

[0066] S2. The main shaft of the lathe body drives the three-jaw chuck and the cylindrical workpiece to rotate, controls one of the first and second tool rests to complete turning, and then controls the other of the first and second tool rests to complete cutting, and removes the processed workpiece.

[0067] The turning completed by the tool holder in step S2 includes: turning the tail of the previous workpiece using the tool on the tool holder and turning the front of the next workpiece using the tool on the tool holder.

[0068] S3. Push the cylindrical workpiece forward so that one end of the cylindrical workpiece is clamped and fixed by the three-jaw chuck, and then repeat step S2, so as to achieve efficient processing of short-axis workpieces.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A CNC lathe for precision machining, comprising: A lathe body (1), a three-jaw chuck (2) is fixedly mounted on the main shaft of the lathe body (1), a tool holder moving assembly (3) is mounted on the bed of the lathe body (1), and a tool holder is mounted on the tool holder moving assembly (3), characterized in that: The tool holder comprises: a first tool holder (4) and a second tool holder (5); A vertical plate (6) is fixedly mounted on the bed of the lathe body (1) and at one end away from the three-jaw chuck (2); a coaxial cylinder (7) is fixedly mounted on the vertical plate (6); and stabilizing structures (8) are fixedly mounted on both ends of the coaxial cylinder (7); a cylindrical workpiece (10) rotates and slides axially inside the stabilizing structure (8).

2. A precision machining CNC lathe according to claim 1, characterized in that: Also includes: A feeding assembly (9), wherein the feeding assembly (9) is fixedly mounted on the bed of the lathe body (1) and is away from one end of the three-jaw chuck (2); The feeding assembly (9) comprises: A transverse telescopic member (901), wherein the transverse telescopic member (901) is arranged horizontally, and one end of the transverse telescopic member (901) is fixedly connected to the bed of the lathe body (1); An inverted T-shaped frame (902) is fixedly mounted on the telescopic end of the transverse telescopic member (901), and a T-shaped sliding groove is arranged on the top of the inverted T-shaped frame (902).

3. A CNC lathe for precision machining according to claim 2, characterized in that: A first clamping jaw (903) and a second clamping jaw (904), wherein the first clamping jaw (903) and the second clamping jaw (904) are both slidably mounted on the T-shaped slide groove, and the first clamping jaw (903) and the second clamping jaw (904) are located on both sides of the cylindrical workpiece (10), and a bidirectional telescopic member (905) is fixedly mounted on the inverted T-shaped frame body (902), and the two telescopic ends of the bidirectional telescopic member (905) are respectively fixedly mounted on the first clamping jaw (903) and the second clamping jaw (904).

4. A CNC lathe for precision machining according to claim 3, characterized in that: A turning tool is fixedly mounted on the second tool holder (5), a cutting tool is fixedly mounted on the first tool holder (4), and the second tool holder (5) is located close to one side of the three-jaw chuck (2).

5. A CNC lathe for precision machining according to claim 4, characterized in that: The tool holder moving assembly (3) comprises: a transverse polished rod (301), a transverse screw rod (302), and a first servo motor (303); both ends of the transverse polished rod (301) are fixedly mounted on the bed of the lathe body (1); the transverse screw rod (302) is rotatably mounted on the bed of the lathe body (1); the first servo motor (303) is fixedly mounted on the bed of the lathe body (1); and the output end of the first servo motor (303) is transmission-connected to the transverse screw rod (302).

6. A CNC lathe for precision machining according to claim 5, characterized in that: The first tool holder (4) comprises a cross frame seat (401), the cross frame seat (401) is threadedly matched with the transverse screw rod (302), and the cross frame seat (401) slides with the transverse polished rod (301).

7. A CNC lathe for precision machining according to claim 6, characterized in that: A longitudinal smooth rod (402) is fixedly mounted on the top of the cross frame seat (401), a longitudinal screw rod (403) is rotatably mounted on the top of the cross frame seat (401), a second servo motor (404) is fixedly mounted on the side of the cross frame seat (401), an output end of the second servo motor (404) is transmission-connected to the longitudinal screw rod (403), a knife seat (405) is slidably mounted on the longitudinal smooth rod (402), and the knife seat (405) is threadably engaged with the longitudinal screw rod (403).

8. A CNC lathe for precision machining according to claim 1, characterized in that: The coaxial cylinder (7) comprises: a transverse cylinder (701), the transverse cylinder (701) is slidably mounted on the vertical plate (6), an annular flange (702) is fixedly mounted on the outer side of the transverse cylinder (701), a plurality of groups of adjustable telescopic parts (703) are fixedly connected to the side of the vertical plate (6), the plurality of groups of adjustable telescopic parts (703) are distributed in an annular array, and the telescopic ends of the adjustable telescopic parts (703) are fixedly connected to the annular flange (702).

9. A processing method for a precision machining CNC lathe, characterized in that: The method of using a precision machining CNC lathe according to any one of claims 1 to 8 comprises the following steps: S1. Pass the cylindrical workpiece through the coaxial cylinder, stabilize the cylindrical workpiece by relying on the stable structures at both ends of the coaxial cylinder, and clamp one end of the cylindrical workpiece with a three-jaw chuck; S2, the main shaft of the lathe body drives the three-jaw chuck and the cylindrical workpiece to rotate, controls one of the first tool rest and the second tool rest to complete turning, and then controls the other of the first tool rest and the second tool rest to complete cutting, and removes the processed workpiece; S3, push the cylindrical workpiece forward so that one end of the cylindrical workpiece is clamped and fixed by the three-jaw chuck, and then repeat step S2.

10. The processing method of a precision machining CNC lathe according to claim 9, characterized in that: In step S2, the tool holder completes turning, including: using the tool on the tool holder to turn the tail of the previous workpiece and using the tool on the tool holder to turn the front of the next workpiece.

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