A machine for simultaneously turning the inner and outer surfaces of a cylindrical part

Abstract

The present application relates to the technical field of machine tool, in particular to a kind of inner and outer surface synchronous turning machine tool of barrel type part, including machine table;The machine table movably is equipped with turning seat;The turning seat is equipped with inner tool holder and outer tool holder;The side of the inner tool holder close to outer tool holder is equipped with inner cutter and inner support block;The side of the outer tool holder close to inner tool holder is equipped with outer cutter and outer support block.The present application realizes the radial linkage action of inner support block and outer support block by linkage assembly, when inner support block is retracted inwards by the inner wall of barrel type part, can synchronously drive outer support block to overcome the action force of tension spring and extend outward and abut barrel type part outer wall, so that inner support block and outer support block are synchronously acted on both sides of the barrel type part in cutting area, respectively with the cutting force of inner cutter and outer cutter form reverse support, effectively offset radial cutting force, inhibit the elastic deformation of barrel type part, guarantee barrel type part wall thickness uniformity and size precision.

Description

Technical Field

[0001] This invention relates to the field of machine tool technology, and specifically to a machine tool for synchronously turning the inner and outer surfaces of cylindrical parts. Background Technology

[0002] Cylindrical parts, especially thin-walled cylindrical components, are widely used in hydraulic cylinders, aerospace conduits, automotive drive shaft sleeves, and other fields. The dimensional accuracy, coaxiality, and wall thickness uniformity of their inner and outer cylindrical surfaces directly affect the assembly accuracy and performance of the entire machine.

[0003] Traditional cylindrical part turning usually adopts a step-by-step machining method, first clamping and machining the inner hole, and then clamping again to machine the outer circle. Multiple clamping can easily lead to cumulative positioning errors, making it difficult to guarantee the coaxiality requirements of the inner and outer circles, and the machining process is long and the production efficiency is low. To solve this problem, the industry has gradually developed machine tools that can simultaneously turn the inner and outer surfaces. They can complete the turning of the inner and outer surfaces in one clamping, effectively reducing the number of clamping times and improving machining efficiency and basic coaxiality.

[0004] However, when existing synchronous turning machine tools process thin-walled cylindrical parts, the radial cutting force applied by the tool to the cylindrical wall during the turning process easily causes elastic deformation of the thin-walled cylindrical wall. When the outer tool cuts, the cylindrical wall is concave inward, and when the inner tool cuts, the cylindrical wall is bulging outward. This ultimately leads to out-of-tolerance outer diameter of the workpiece, reduced coaxiality of inner and outer diameters, and decreased uniformity of wall thickness. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a machine tool for synchronously turning the inner and outer surfaces of cylindrical parts.

[0006] The objective of this invention is achieved through the following technical solution: a machine tool for synchronously turning the inner and outer surfaces of a cylindrical part, comprising a machine base; the machine base is provided with a rotary seat; the rotary seat is rotatably equipped with a clamp for holding the cylindrical part; The machine tool is movably equipped with a turning seat; the turning seat is equipped with an inner tool post and an outer tool post; both the inner and outer tool posts extend along the axial direction of the cylindrical part; the inner tool post is equipped with an inner tool and an inner support block on the side near the outer tool post; the outer tool post is equipped with an outer tool and an outer support block on the side near the inner tool post. The inner support block is slidably disposed on the inner tool holder along the radial direction of the cylindrical part; the outer support block and the outer tool are respectively slidably disposed on the outer tool holder along the radial direction of the cylindrical part.

[0007] The invention is further configured such that the machine tool is provided with a first linear module; the output end of the first linear module is connected to a second linear module; the turning seat is located at the output end of the second linear module; the first linear module is used to drive the turning seat to move along the axial direction of the cylindrical part; the second linear module is used to drive the turning seat to move along the radial direction of the cylindrical part.

[0008] The invention is further configured such that the outer tool holder is equipped with a cylinder; the output end of the cylinder is connected to the outer tool.

[0009] The present invention is further configured such that a first outer abutment wheel and a second outer abutment wheel are rotatably provided at one end of the outer support block near the inner tool holder; the axis of the first outer abutment wheel, the axis of the second outer abutment wheel and the axis of the cylindrical part are arranged in parallel.

[0010] The invention is further configured such that the inner tool holder is provided with a sliding groove on the side near the outer tool holder; the inner support block is slidably disposed in the sliding groove along the radial direction of the cylindrical part.

[0011] The present invention is further configured such that a linkage component is provided between the inner support block and the outer support block.

[0012] The present invention is further configured such that the linkage assembly includes an inner connecting rod, a middle connecting rod, and an outer connecting rod; the middle portion of the inner connecting rod is provided with an inner strip groove; the inner tool holder is provided with an inner limiting pin; the inner limiting pin is movably disposed in the inner strip groove; the middle portion of the outer connecting rod is provided with an outer strip groove; the outer tool holder is provided with an outer limiting pin; the outer limiting pin is movably disposed in the outer strip groove; one end of the middle connecting rod is slidably disposed in the inner tool holder along the radial direction of the cylindrical part; one end of the middle connecting rod is provided with a first strip groove; the other end of the middle connecting rod is slidably disposed in the outer tool holder along the radial direction of the cylindrical part; the other end of the middle connecting rod is provided with a second strip groove; the end of the inner support block away from the outer tool holder is hinged to one end of the inner connecting rod; the other end of the inner connecting rod is provided with a first limiting pin; the first limiting pin is movably disposed in the first strip groove; the end of the outer support block away from the inner tool holder is hinged to one end of the outer connecting rod; the other end of the outer connecting rod is provided with a second limiting pin; the second limiting pin is movably disposed in the second strip groove.

[0013] The present invention is further configured such that a tension spring is provided between the end of the outer support block away from the inner tool holder and the outer tool holder.

[0014] The present invention is further configured such that a first inner abutment wheel and a second inner abutment wheel are rotatably provided at one end of the inner support block near the outer tool holder; the axis of the first inner abutment wheel, the axis of the second inner abutment wheel and the axis of the cylindrical part are arranged in parallel.

[0015] The present invention is further configured such that the inner support block is provided with a first floating groove and a second floating groove; the first floating groove is provided with a first floating block slidably along the radial direction of the cylindrical part; the first inner abutment wheel is rotatably disposed on the first floating block; the second floating groove is provided with a second floating block slidably along the radial direction of the cylindrical part; the second inner abutment wheel is rotatably disposed on the second floating block; The inner support block is provided with a sealing channel; the first floating block is provided with a first floating pin; the second floating block is provided with a second floating pin; the first floating pin and the second floating pin are respectively sealed and slidably disposed at both ends of the sealing channel.

[0016] The beneficial effects of the present invention are as follows: The present invention realizes the radial linkage action of the inner support block and the outer support block through the linkage component. When the inner support block is pushed inward by the inner wall of the cylindrical part, it can simultaneously drive the outer support block to overcome the tension spring force and extend outward to abut against the outer wall of the cylindrical part. This allows the inner support block and the outer support block to act synchronously on both sides of the cylindrical part in the cutting area, forming opposite support with the cutting forces of the inner and outer tools respectively. This effectively counteracts the radial cutting force, suppresses the elastic deformation of the cylindrical part, and ensures the uniformity of the wall thickness and the dimensional accuracy of the cylindrical part. Attached Figure Description

[0017] The invention will be further illustrated with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the invention. For those skilled in the art, other drawings can be obtained based on the following drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure behind the concealed machine of the present invention; Figure 3 This is a schematic diagram of the structure of the turning seat of the present invention; Figure 4 yes Figure 3 A magnified view of part A in the middle; Figure 5 This is a cross-sectional view of the turning seat of the present invention; Figure 6 yes Figure 5 A magnified view of part B in the middle; Figure 7 This is a schematic diagram of the internal support block of the present invention; Figure 8 This is a cross-sectional view of the internal support block of the present invention; The components include: 1. Machine base; 11. Cylindrical part; 12. Rotary seat; 13. Fixture; 2. Turning seat; 21. First linear module; 22. Second linear module; 3. Inner tool post; 31. Inner tool; 32. Sliding groove; 33. Inner limit pin; 4. Outer tool post; 41. Outer tool; 42. Cylinder; 43. Outer limit pin; 5. Inner support block; 51. First floating groove; 52. Second floating groove; 53. First floating block; 54. Second floating... 55. First inner abutment wheel; 56. Second inner abutment wheel; 57. First floating pin; 58. Second floating pin; 59. Sealing channel; 6. Outer support block; 61. First outer abutment wheel; 62. Second outer abutment wheel; 63. Tension spring; 7. Inner connecting rod; 71. Inner strip groove; 72. First limiting pin; 8. Outer connecting rod; 81. Outer strip groove; 82. Second limiting pin; 9. Middle connecting rod; 91. First strip groove; 92. Second strip groove. Detailed Implementation

[0019] The present invention will be further described in conjunction with the following embodiments.

[0020] Depend on Figures 1 to 8 As can be seen, the synchronous turning machine tool for the inner and outer surfaces of a cylindrical part 11 described in this embodiment includes a machine base 1; the machine base 1 is provided with a rotary seat 12; the rotary seat 12 is rotatably provided with a clamp 13 for holding the cylindrical part 11; The machine base 1 is movably equipped with a turning seat 2; the turning seat 2 is equipped with an inner tool post 3 and an outer tool post 4; the inner tool post 3 and the outer tool post 4 both extend along the axial direction of the cylindrical part 11; the inner tool post 3 is equipped with an inner tool 31 and an inner support block 5 on the side near the outer tool post 4; the outer tool post 4 is equipped with an outer tool 41 and an outer support block 6 on the side near the inner tool post 3. The inner support block 5 is slidably disposed on the inner tool holder 3 along the radial direction of the cylindrical part 11; the outer support block 6 and the outer tool 41 are respectively slidably disposed on the outer tool holder 4 along the radial direction of the cylindrical part 11.

[0021] Specifically, in the synchronous turning machine tool for the inner and outer surfaces of the cylindrical part 11 described in this embodiment, when machining the cylindrical part 11, the fixture 13 clamps and fixes the cylindrical part 11, the rotary seat 12 drives the fixture 13 and the cylindrical part 11 to rotate synchronously around their own axis, the turning seat 2 can move along the machine table 1, driving the inner tool post 3 to extend into the interior of the cylindrical part 11, and the outer tool post 4 is located outside the cylindrical part 11, so that the inner tool 31 and the outer tool 41 correspond to the machining positions of the inner and outer surfaces of the cylindrical part 11, respectively. The inner support block 5 can slide radially on the inner tool post 3 to adjust the support position on the inner wall. The outer support block 6 and the outer tool 41 can slide radially on the outer tool holder 4 to adjust the support position and cutting depth of the outer wall. In this embodiment, the inner tool holder 3 and the outer tool holder 4 are integrated, and the turning of the inner and outer surfaces of the cylindrical part 11 can be completed simultaneously in one clamping, reducing the number of clamping times and the cumulative positioning error. In addition, with the radially sliding inner support block 5 and the outer support block 6, a bidirectional support can be formed on the cylindrical wall of the cylindrical part 11 in the cutting area to counteract the radial force generated by cutting, suppress the elastic deformation of the cylindrical part 11, and ensure the uniformity of wall thickness and the coaxiality of the inner and outer circles.

[0022] This embodiment describes a machine tool for synchronously turning the inner and outer surfaces of a cylindrical part 11. The machine base 1 is equipped with a first linear module 21; the output end of the first linear module 21 is connected to a second linear module 22; the turning seat 2 is located at the output end of the second linear module 22; the first linear module 21 is used to drive the turning seat 2 to move along the axial direction of the cylindrical part 11; the second linear module 22 is used to drive the turning seat 2 to move along the radial direction of the cylindrical part 11. Specifically, the first linear module 21 is arranged along the axial direction of the cylindrical part 11 and can drive the second linear module 22 and the turning seat 2 to feed axially as a whole, driving the inner tool 31 and the outer tool 41 to continuously move along the workpiece axial direction to complete the turning process over a long range; the second linear module 22 is arranged radially along the cylindrical part 11 and can drive the turning seat 2 to move radially as a whole, synchronously adjusting the radial position of the inner tool holder 3 and the outer tool holder 4 to adapt to cylindrical parts 11 of different diameters and control the depth of cut.

[0023] This embodiment describes a machine tool for synchronously turning the inner and outer surfaces of a cylindrical part 11. The outer tool post 4 is equipped with a cylinder 42; the output end of the cylinder 42 is connected to the outer cutting tool 41. During machining, the cylinder 42 is fixed on the outer tool post 4, and its output end extends and retracts radially along the cylindrical part 11, independently driving the outer cutting tool 41 to feed and retract radially along the cylindrical part 11, controlling the cutting depth of the outer surface of the cylindrical part 11, without interfering with the feeding action of the inner cutting tool 31.

[0024] This embodiment describes a machine tool for synchronously turning the inner and outer surfaces of a cylindrical part 11. The outer support block 6, near the inner tool holder 3, is rotatably equipped with a first outer abutment wheel 61 and a second outer abutment wheel 62. The axes of the first outer abutment wheel 61, the second outer abutment wheel 62, and the cylindrical part 11 are parallel. Specifically, when the outer support block 6 moves towards the outer wall of the cylindrical part 11, the first outer abutment wheel 61 and the second outer abutment wheel 62 simultaneously abut against the outer circumferential surface of the cylindrical part 11, forming two-point support. When the cylindrical part 11 rotates, the first outer abutment wheel 61 and the second outer abutment wheel 62 rotate synchronously with the workpiece, continuously applying radial support force to the outer wall of the cylindrical part in a rolling contact manner.

[0025] This embodiment describes a machine tool for synchronously turning the inner and outer surfaces of a cylindrical part 11. The inner tool post 3 has a sliding groove 32 on the side near the outer tool post 4. The inner support block 5 is slidably disposed in the sliding groove 32 along the radial direction of the cylindrical part 11. The sliding groove 32 is radially formed on the side wall of the inner tool post 3, providing guidance and limiting for the radial sliding of the inner support block 5. When the inner support block 5 is subjected to the reaction force of the inner wall of the cylindrical part 11 or the action of the linkage assembly, it reciprocates radially along the sliding groove 32, stably adjusting the extension amount of the inner support block 5.

[0026] This embodiment describes a machine tool for synchronously turning the inner and outer surfaces of a cylindrical part 11. A linkage assembly is provided between the inner support block 5 and the outer support block 6. Specifically, the linkage assembly connects the inner support block 5 and the outer support block 6, forming a mechanical linkage transmission. When the inner support block 5 is pushed radially inward by the inner wall of the cylindrical part 11, power can be transmitted through the linkage assembly to drive the outer support block 6 to extend radially outward; conversely, when the inner support block 5 extends outward, the outer support block 6 can synchronously retract inward, achieving radial synchronous linkage between the inner support block 5 and the outer support block 6.

[0027] This embodiment describes a machine tool for synchronously turning the inner and outer surfaces of a cylindrical part 11. The linkage assembly includes an inner connecting rod 7, a middle connecting rod 9, and an outer connecting rod 8. The inner connecting rod 7 has an inner slot 71 in its middle. The inner tool post 3 has an inner limiting pin 33, which is movably disposed in the inner slot 71. The outer connecting rod 8 has an outer slot 81 in its middle. The outer tool post 4 has an outer limiting pin 43, which is movably disposed in the outer slot 81. One end of the middle connecting rod 9 is slidably disposed on the inner tool post 3 along the radial direction of the cylindrical part 11. The first strip groove 91 is provided; the other end of the middle connecting rod 9 is slidably disposed on the outer tool holder 4 along the radial direction of the cylindrical part 11; the other end of the middle connecting rod 9 is provided with a second strip groove 92; the end of the inner support block 5 away from the outer tool holder 4 is hinged to one end of the inner connecting rod 7; the other end of the inner connecting rod 7 is provided with a first limiting pin 72; the first limiting pin 72 is movably disposed in the first strip groove 91; the end of the outer support block 6 away from the inner tool holder 3 is hinged to one end of the outer connecting rod 8; the other end of the outer connecting rod 8 is provided with a second limiting pin 82; the second limiting pin 82 is movably disposed in the second strip groove 92.

[0028] Specifically, in the synchronous turning machine tool for the inner and outer surfaces of the cylindrical part 11 described in this embodiment, when the inner support block 5 retracts inward, it pushes one end of the inner connecting rod 7 to move inward synchronously. The inner connecting rod 7 forms a lever swing with the inner limit pin 33 and the inner strip groove 71 as fulcrums. The other end of the inner connecting rod 7 slides along the first strip groove 91 through the first limit pin 72, driving the middle connecting rod 9 to translate in the radial direction. When the middle connecting rod 9 moves, the second strip groove 92 at the other end of the middle connecting rod 9 drives the outer connecting rod 8 to swing through the second limit pin 82. The outer connecting rod 8 forms a lever swing with the outer limit pin 43 and the outer strip groove 81 as fulcrums, pushing the outer support block 6 to overcome the tension of the tension spring 63 and extend outward in the radial direction, thereby abutting against the outer wall of the cylindrical part 11.

[0029] In this embodiment, a machine tool for synchronously turning the inner and outer surfaces of a cylindrical part 11 is described. A tension spring 63 is provided between the end of the outer support block 6 furthest from the inner tool holder 3 and the outer tool holder 4. Specifically, the tension spring 63 always applies a pulling force to the outer support block 6 away from the cylindrical part 11. When the inner support block 5 extends outward or the pushing force of the linkage component decreases, the tension spring 63 can pull the outer support block 6 radially inward, achieving automatic reset of the outer support block 6.

[0030] This embodiment describes a machine tool for synchronously turning the inner and outer surfaces of a cylindrical part 11. The inner support block 5, near the outer tool holder 4, is rotatably equipped with a first inner abutment wheel 55 and a second inner abutment wheel 56. The axes of the first inner abutment wheel 55, the second inner abutment wheel 56, and the cylindrical part 11 are parallel. Specifically, when the inner support block 5 moves towards the inner wall of the cylindrical part 11, the first inner abutment wheel 55 and the second inner abutment wheel 56 simultaneously abut against the inner wall of the cylindrical part 11, forming two-point support from the inside of the cylindrical part 11. When the cylindrical part 11 rotates, the first inner abutment wheel 55 and the second inner abutment wheel 56 rotate synchronously with the workpiece, continuously applying radial support force to the inner wall of the cylindrical part 11 in a rolling contact manner, forming opposing clamping with the outer first outer abutment wheel 61 and the second outer outer abutment wheel 62.

[0031] This embodiment describes a machine tool for synchronously turning the inner and outer surfaces of a cylindrical part 11. The inner support block 5 is provided with a first floating groove 51 and a second floating groove 52. A first floating block 53 is slidably provided in the first floating groove 51 along the radial direction of the cylindrical part 11. A first inner abutment wheel 55 is rotatably provided on the first floating block 53. A second floating block 54 is slidably provided in the second floating groove 52 along the radial direction of the cylindrical part 11. A second inner abutment wheel 56 is rotatably provided on the second floating block 54. The inner support block 5 is provided with a sealing channel 59; the first floating block 53 is provided with a first floating pin 57; the second floating block 54 is provided with a second floating pin 58; the first floating pin 57 and the second floating pin 58 are respectively sealed and slidably disposed at both ends of the sealing channel 59.

[0032] Specifically, when the first inner abutting wheel 55 and the second inner abutting wheel 56 abut against the inner wall of the cylindrical part 11, if the cylindrical part 11 has a roundness error or local dimensional fluctuation, the inner abutting wheel at the corresponding position will be subjected to additional thrust, causing the corresponding floating block to slide inward along the floating groove, and the floating pin to compress the buffer gas in the sealing channel 59. After the gas pressure in the sealing channel 59 increases, it will act in the opposite direction on the floating pin and floating block at both ends, so that both abutting wheels remain in contact with the cylindrical wall, automatically adapting to local dimensional changes in the cylindrical wall and maintaining uniform support pressure. In this embodiment, the compressibility of the buffer gas in the sealing channel 59 is used to realize the adaptive floating of the first inner abutting wheel 55 and the second inner abutting wheel 56, which can automatically adapt to the original roundness error and local dimensional fluctuation of the cylindrical part 11, avoiding local overpressure deformation or insufficient support caused by rigid support. In addition, gas buffering can effectively absorb cutting vibration, suppress machining marks, and improve the surface machining quality and dimensional accuracy of the workpiece.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A machine tool for synchronously turning the inner and outer surfaces of a cylindrical part, characterized in that: Includes a machine base (1); the machine base (1) is provided with a rotating seat (12); the rotating seat (12) is rotatably provided with a clamp (13) for clamping a cylindrical part (11); The machine tool (1) is movably equipped with a turning seat (2); the turning seat (2) is equipped with an inner tool post (3) and an outer tool post (4); the inner tool post (3) and the outer tool post (4) are both extended along the axial direction of the cylindrical part (11); the inner tool post (3) is equipped with an inner tool (31) and an inner support block (5) on the side near the outer tool post (4); the outer tool post (4) is equipped with an outer tool (41) and an outer support block (6) on the side near the inner tool post (3); The inner support block (5) is slidably disposed on the inner tool holder (3) along the radial direction of the cylindrical part (11); the outer support block (6) and the outer tool (41) are slidably disposed on the outer tool holder (4) along the radial direction of the cylindrical part (11).

2. The machine tool for synchronous turning of the inner and outer surfaces of a cylindrical part according to claim 1, characterized in that: The machine tool (1) is provided with a first linear module (21); the output end of the first linear module (21) is connected to a second linear module (22); the turning seat (2) is located at the output end of the second linear module (22); the first linear module (21) is used to drive the turning seat (2) to move along the axial direction of the cylindrical part (11); the second linear module (22) is used to drive the turning seat (2) to move along the radial direction of the cylindrical part (11).

3. The machine tool for synchronous turning of the inner and outer surfaces of a cylindrical part according to claim 1, characterized in that: The outer tool holder (4) is equipped with a cylinder (42); the output end of the cylinder (42) is connected to the outer tool (41).

4. The machine tool for synchronous turning of the inner and outer surfaces of a cylindrical part according to claim 1, characterized in that: The outer support block (6) is rotatably provided with a first outer abutment wheel (61) and a second outer abutment wheel (62) at one end near the inner tool holder (3); the axis of the first outer abutment wheel (61), the axis of the second outer abutment wheel (62) and the axis of the cylindrical part (11) are arranged in parallel.

5. The machine tool for synchronous turning of the inner and outer surfaces of a cylindrical part according to claim 1, characterized in that: The inner tool holder (3) is provided with a sliding groove (32) on the side near the outer tool holder (4); the inner support block (5) is slidably disposed in the sliding groove (32) along the radial direction of the cylindrical part (11).

6. The machine tool for synchronous turning of the inner and outer surfaces of a cylindrical part according to claim 1, characterized in that: A linkage component is provided between the inner support block (5) and the outer support block (6).

7. A machine tool for synchronously turning the inner and outer surfaces of a cylindrical part according to claim 6, characterized in that: The linkage assembly includes an inner connecting rod (7), a middle connecting rod (9), and an outer connecting rod (8); the inner connecting rod (7) has an inner strip groove (71) in the middle; the inner tool holder (3) has an inner limiting pin (33); the inner limiting pin (33) is movably disposed in the inner strip groove (71); the outer connecting rod (8) has an outer strip groove (81) in the middle; the outer tool holder (4) has an outer limiting pin (43); the outer limiting pin (43) is movably disposed in the outer strip groove (81); one end of the middle connecting rod (9) slides along the radial direction of the cylindrical part (11) on the inner tool holder (3); one end of the middle connecting rod (9) has a first strip groove (91); the middle connecting rod (9) has an inner strip groove (91) in the middle; the inner connecting rod (7) has an inner strip groove (71) in the middle; the inner tool holder (4) has an inner limiting pin (33) in the middle; the inner tool holder (4) has an outer limiting pin (43) in the middle; the outer limiting pin (43) is movably disposed in the outer strip groove (81); one end of the middle connecting rod (9) slides along the radial direction of the cylindrical part (11) on the inner tool holder (3); one end of the middle connecting rod (9) has a first strip groove (91); the inner connecting rod (9) has an inner strip groove (71) in the middle; the inner tool holder (4) has an inner limiting pin (73) in the middle; the inner tool holder (4) has an inner limiting pin (33) in the middle; the inner tool holder (4) has an outer limiting pin (4 ... The other end of the rod (9) is slidably disposed on the outer tool holder (4) along the radial direction of the cylindrical part (11); the other end of the middle connecting rod (9) is provided with a second strip groove (92); the end of the inner support block (5) away from the outer tool holder (4) is hinged to one end of the inner connecting rod (7); the other end of the inner connecting rod (7) is provided with a first limiting pin (72); the first limiting pin (72) is movably disposed in the first strip groove (91); the end of the outer support block (6) away from the inner tool holder (3) is hinged to one end of the outer connecting rod (8); the other end of the outer connecting rod (8) is provided with a second limiting pin (82); the second limiting pin (82) is movably disposed in the second strip groove (92).

8. A machine tool for synchronously turning the inner and outer surfaces of a cylindrical part according to claim 7, characterized in that: A tension spring (63) is provided between the end of the outer support block (6) away from the inner tool holder (3) and the outer tool holder (4).

9. A machine tool for synchronously turning the inner and outer surfaces of a cylindrical part according to claim 1, characterized in that: The inner support block (5) is rotatably provided with a first inner abutment wheel (55) and a second inner abutment wheel (56) at one end near the outer tool holder (4); the axis of the first inner abutment wheel (55), the axis of the second inner abutment wheel (56) and the axis of the cylindrical part (11) are arranged in parallel.

10. A machine tool for synchronously turning the inner and outer surfaces of a cylindrical part according to claim 9, characterized in that: The inner support block (5) is provided with a first floating groove (51) and a second floating groove (52); the first floating groove (51) is provided with a first floating block (53) which slides along the radial direction of the cylindrical part (11); the first inner abutment wheel (55) is rotatably disposed on the first floating block (53); the second floating groove (52) is provided with a second floating block (54) which slides along the radial direction of the cylindrical part (11); the second inner abutment wheel (56) is rotatably disposed on the second floating block (54); The inner support block (5) is provided with a sealing channel (59); the first floating block (53) is provided with a first floating pin (57); the second floating block (54) is provided with a second floating pin (58); the first floating pin (57) and the second floating pin (58) are respectively sealed and slidably disposed at both ends of the sealing channel (59).

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