A machine tool for turning steps of a drive shaft and the turning process

Abstract

This invention belongs to the field of drive shaft turning technology, specifically a drive shaft step turning machine tool and turning process. Addressing the issue that drive shafts generate heat and undergo axial deformation during turning, making it difficult for the tailstock to effectively handle this deformation, potentially leading to drive shaft bending and failure, the invention proposes the following solution: a turning frame with two guide rails on it, on which the same tailstock is slidably mounted; and two linear lead screws symmetrically positioned on both sides of the turning frame. This drive shaft step turning machine tool improves the turning effect. During turning, after the tailstock clamps the drive shaft, it provides a certain amount of axial movement to the tailstock, preventing bending and failure due to insufficient axial space when the drive shaft undergoes thermal axial deformation during turning, thus improving the overall performance of the device.

Description

Technical Field

[0001] This invention relates to the field of drive shaft turning technology, and in particular to a drive shaft step turning machine tool and turning process. Background Technology

[0002] The driveshaft is a key component in the automotive transmission system. It is mainly used to connect the transmission and the drive axle, or in part-time four-wheel drive vehicles, to connect the transfer case and the front and rear axles. Its core function is to transmit the torque and rotational motion output by the engine to the wheels, while compensating for changes in angle and distance between the transmission and the drive axle caused by suspension deformation or installation errors. It is widely used in the transmission systems of front-engine rear-wheel drive, four-wheel drive, and some large trucks.

[0003] The drive shaft step turning machine is a metal cutting device specially designed for machining complex stepped structures such as stepped journals and shoulders of drive shafts. As a high-efficiency forming machine tool, it controls the precise relative movement between the tool and the workpiece through a CNC system to perform high-speed and high-precision turning of the rotating drive shaft. It can complete the machining of the outer circle, end face and chamfer of multiple steps in one go, significantly improving the geometric accuracy and surface quality of the drive shaft.

[0004] Existing drive shafts are clamped using a tailstock during turning. However, after clamping, the tailstock is usually fixed, while the drive shaft generates heat and undergoes axial deformation during turning. As a result, the tailstock cannot effectively cope with the axial deformation during turning, which can easily lead to the drive shaft bending and becoming unusable, thus affecting the turning effect. Summary of the Invention

[0005] This invention discloses a turning machine tool and turning process for a drive shaft step, aiming to solve the technical problem in the background art that the drive shaft generates heat and has a certain axial deformation during the turning process, which makes it difficult for the center tailstock to effectively cope with the axial deformation during turning, thus easily leading to the drive shaft bending and scrapping.

[0006] The present invention proposes a step turning machine tool for drive shafts, comprising:

[0007] A turning machine frame, on which two guide rails are provided, and the same center tailstock is slidably mounted on the two guide rails; Two linear lead screws are symmetrically arranged on both sides of the turning machine frame. Two guide rods are also symmetrically arranged on both sides of the turning machine frame. Tool holders are provided on the two guide rods and the two linear lead screws. The two guide rods are located below the two linear lead screws. A turning shaft change unit is installed inside the turning machine frame and at the bottom of the center tailstock. The turning shaft change unit includes a movable shaft frame and a fixed shaft frame. A top coil chamber is fixedly installed on the fixed shaft frame, and a center coil spring is installed inside the top coil chamber. A turning vibration damping module is disposed on the top of the tool holder. The turning vibration damping module includes multiple damping arc arms and multiple damping rods.

[0008] In a preferred embodiment, it also includes: A fixed chuck is mounted on the turning machine frame, and a drive shaft body is provided between the fixed chuck and the center tailstock. The control panel is mounted on the turning machine frame; Two stepper motors are symmetrically arranged on both sides of the turning machine frame, and the output shafts of the two stepper motors are respectively connected to one end of two linear lead screws via couplings.

[0009] In a preferred embodiment, the turning shaft variable unit further includes: Tailstock bracket, the tailstock bracket is set at the bottom of the top tailstock, the tailstock bracket is provided with two fixed cables, and the movable shaft bracket is set on one end of the two fixed cables; The mounting bracket is located inside the turning machine frame. A general-purpose motor is mounted on the mounting bracket. The output shaft of the general-purpose motor is connected to a double-wire winding roller via a coupling. Two connecting cables are mounted on the double-wire winding roller.

[0010] In a preferred embodiment, the turning shaft variable unit further includes: Two fixed plate frames are provided inside the turning machine frame. The two fixed plate frames are provided with the same double groove guide wheel. The outer walls of the two connecting cables are in contact with the inner walls of the double groove guide wheel. The fixed shaft frame is provided on one end of the two connecting cables. Two guide holes are symmetrically opened on one side of the movable shaft bracket; Two guide rods are symmetrically arranged on one side of the fixed shaft bracket, and the outer walls of the two guide rods are in contact with the interior of the two guide holes respectively.

[0011] In a preferred embodiment, the turning shaft variable unit further includes: A fixed central shaft is provided, which is located on the top winding chamber, and one end of the top winding spring is located on the fixed central shaft. Two strong contraction springs are respectively set on the outside of the two guide rods. One end of each strong contraction spring is set on the fixed shaft bracket, and the other end of each strong contraction spring is set on the movable shaft bracket. Both strong contraction springs are located inside the movable shaft bracket. Two locking blocks, both of which are mounted on a fixed shaft bracket; A connecting shaft is located inside the movable shaft bracket and between two strong contraction springs. One end of the connecting shaft is located on the other end of the top coil spring.

[0012] In a preferred embodiment, the turning shaft variable unit further includes: A fixed bracket is provided on the top of the movable shaft frame. The fixed bracket is provided with a mounting shaft, and the mounting shaft is provided with a mounting component and two locking arms. The two locking arms are respectively engaged with two locking blocks, and the mounting component is located between the two locking arms. The fixing component is located on the inner wall of one side of the movable shaft frame, and the fixing component and the mounting component are equipped with the same electric telescopic rod.

[0013] In a preferred embodiment, the turning vibration damping module further includes: A frame component is located on the top of the tool holder. The frame component contains multiple shaft components, and multiple damping arc arms are respectively mounted on the multiple shaft components. Two servo motors are symmetrically arranged on both sides of the frame component, and the output shafts of the two servo motors are respectively set at one end of two shaft components via couplings.

[0014] In a preferred embodiment, the turning vibration damping module further includes: Multiple gear components are respectively mounted on multiple shaft components, and two gear components on the same side mesh with each other; Multiple mounting frames are respectively set on multiple damping arc arms, and multiple damping rods are respectively set inside the multiple mounting frames.

[0015] In a preferred embodiment, the turning vibration damping module further includes: Multiple connecting brackets are respectively disposed at one end of multiple vibration damping rods, and each of the multiple connecting brackets is provided with a fixed shaft inside; Multiple axle rollers are respectively mounted on multiple fixed shafts. Each of the multiple axle rollers is provided with a contact pad layer, and the outer wall of each of the multiple contact pad layers is in contact with the outer wall of the transmission shaft body.

[0016] A process for turning a drive shaft step, using a drive shaft step turning machine tool as described above, includes the following steps: Step 1: The turning shaft transformer unit operates to drive the center tailstock to move, and the center tailstock cooperates with the fixed chuck to clamp the transmission shaft body. Step 2: After clamping, the turning shaft change unit runs again to cancel the snap-fit ​​between the fixed shaft support and the movable shaft support, thereby allowing the center tailstock to move axially and perform turning. Step 3: During turning, the turning vibration damping module is activated so that the vibration damping arc arm drives the shaft wheel, contact pad layer and drive shaft body to contact, so that the vibration damping rod is damped during turning until the turning is completed. Step 4: After turning, remove the machined drive shaft body from the center tailstock and fixed chuck, and collect it.

[0017] As can be seen from the above, the drive shaft step turning machine tool provided by the present invention has the function of improving the turning effect of drive shaft. During turning, the device can provide a certain amount of axial movement to the center tailstock after the center tailstock has completed clamping the drive shaft, so as to avoid the drive shaft bending and being scrapped due to insufficient axial space when thermal axial deformation occurs during the turning of the drive shaft, thereby improving the use effect of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a drive shaft step turning machine tool proposed in this invention; Figure 2 This is a bottom view schematic diagram of a drive shaft step turning machine tool proposed in this invention; Figure 3 This is a schematic diagram of the combined structure of the center tailstock and guide rail of a step turning machine tool with a drive shaft proposed in this invention. Figure 4 This is a schematic diagram of the turning shaft variable unit structure of a drive shaft step turning machine tool proposed in this invention; Figure 5 This is a schematic diagram of a combined structure of a double-groove guide wheel and a double-wire roll for a drive shaft step turning machine tool proposed in this invention. Figure 6 This is a schematic cross-sectional view of the movable shaft support structure of a step turning machine tool for transmission shafts proposed in this invention; Figure 7 This is a schematic diagram of the top coil chamber and the center coil spring of a drive shaft step turning machine tool proposed in this invention. Figure 8 This is a schematic diagram of a turning vibration damping module structure for a drive shaft step turning machine tool proposed in this invention; Figure 9 This is a schematic diagram of the combined structure of the damping arc arm and gear component of a drive shaft step turning machine tool proposed in this invention; Figure 10 This is a schematic diagram of the disassembled structure of the shaft wheel and vibration damping rod of a step turning machine tool for a transmission shaft proposed in this invention.

[0019] In the diagram: 1. Turning machine frame; 2. Stepper motor; 3. Tailstock; 4. Turning vibration damping module; 401. Frame component; 402. Mounting sleeve; 403. Servo motor; 404. Shaft component; 405. Gear component; 406. Vibration damping arc arm; 407. Contact pad; 408. Fixed shaft; 409. Shaft wheel component; 410. Vibration damping rod; 411. Connecting bracket; 5. Drive shaft body; 6. Fixed chuck; 7. Control panel; 8. Turning shaft conversion unit; 801. Tailstock bracket; 802. Fixed cable; 803. Movable shaft bracket; 804. Fixed shaft bracket; 805. Mounting bracket; 806. General motor; 807. Connecting cable; 808. Fixing plate frame; 809. Double groove guide wheel; 810. Double wire winding roller; 811. Top winding chamber; 812. Guide rod; 813. Locking block; 814. Locking arm; 815. Mounting shaft; 816. Fixing component; 817. Electric telescopic rod; 818. Guide hole; 819. Strong contraction spring; 820. Fixed central shaft; 821. Center coil spring; 822. Connecting shaft column; 823. Fixing bracket; 824. Mounting component; 9. Tool holder; 10. Linear lead screw; 11. Guide rod; 12. Guide rail component. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] The present invention discloses a step turning machine tool for drive shafts, which is mainly used in scenarios where the drive shaft generates heat and undergoes a certain axial deformation during the turning process. As a result, the center tailstock has difficulty in effectively coping with the axial deformation during turning, which can easily lead to the drive shaft bending and becoming unusable.

[0022] Reference Figures 1-10 A step turning machine tool for drive shafts, comprising: A turning machine frame 1 is provided with two guide rails 12, and the same center tailstock 3 is slidably mounted on the two guide rails 12. Two linear lead screws 10 are symmetrically arranged on both sides of the turning machine frame 1. Two guide rods 11 are also symmetrically arranged on both sides of the turning machine frame 1. Tool holders 9 are provided on the two guide rods 11 and the two linear lead screws 10. The two guide rods 11 are located below the two linear lead screws 10. Turning shaft change unit 8 is located inside the turning machine frame 1 and at the bottom of the center tailstock 3. Turning shaft change unit 8 includes a movable shaft frame 803 and a fixed shaft frame 804. A top coil chamber 811 is fixedly installed on the fixed shaft frame 804. A center coil spring 821 is installed inside the top coil chamber 811. Turning vibration damping module 4 is located on the top of tool holder 9. Turning vibration damping module 4 includes multiple damping arc arms 406 and multiple damping rods 410.

[0023] Reference Figure 1 , Figure 2 and Figure 3 In a preferred embodiment, it further includes: A fixed chuck 6 is mounted on the turning machine frame 1, and a drive shaft body 5 is provided between the fixed chuck 6 and the center tailstock 3. Control screen 7 is mounted on the turning machine frame 1; Two stepper motors 2 are symmetrically arranged on both sides of the turning frame 1. The output shafts of the two stepper motors 2 are respectively connected to one end of two linear lead screws 10 through couplings.

[0024] Reference Figures 2-7 In a preferred embodiment, the turning shaft variable unit 8 further includes: Tailstock bracket 801 is located at the bottom of the top tailstock 3. Two fixed cables 802 are provided on the tailstock bracket 801, and the movable shaft bracket 803 is located on one end of the two fixed cables 802. Mounting bracket 805 is located inside the turning machine frame 1. A general-purpose motor 806 is mounted on the mounting bracket 805. The output shaft of the general-purpose motor 806 is connected to a double-wire winding roller 810 via a coupling. Two connecting cables 807 are mounted on the double-wire winding roller 810.

[0025] In this invention, the turning shaft variable unit 8 further includes: Two fixed plate frames 808 are both located inside the turning machine frame 1. The two fixed plate frames 808 are equipped with the same double groove guide wheel 809. The outer walls of the two connecting cables 807 are in contact with the inner walls of the double groove guide wheel 809. The fixed shaft frame 804 is located on one end of the two connecting cables 807. Two guide holes 818 are symmetrically opened on one side of the movable shaft bracket 803; Two guide rods 812 are symmetrically arranged on one side of the fixed shaft bracket 804, and the outer walls of the two guide rods 812 are in contact with the interior of the two guide holes 818 respectively.

[0026] In this invention, the turning shaft variable unit 8 further includes: A fixed central shaft 820 is mounted on the top winding chamber 811, and one end of the top coil spring 821 is mounted on the fixed central shaft 820. Two strong contraction springs 819 are respectively set on the outside of the two guide rods 812. One end of each of the two strong contraction springs 819 is set on the fixed shaft bracket 804, and the other end of each of the two strong contraction springs 819 is set on the movable shaft bracket 803. Both strong contraction springs 819 are located inside the movable shaft bracket 803. Two locking blocks 813 are mounted on the fixed shaft bracket 804. The connecting shaft 822 is located inside the movable shaft bracket 803. The connecting shaft 822 is located between two strong contraction springs 819, and one end of the connecting shaft 822 is located on the other end of the top coil spring 821.

[0027] In this invention, the turning shaft variable unit 8 further includes: A fixed bracket 823 is provided on the top of the movable shaft bracket 803. A mounting shaft 815 is provided on the fixed bracket 823. A mounting part 824 and two locking arms 814 are provided on the mounting shaft 815. The two locking arms 814 are respectively engaged with two locking blocks 813. The mounting part 824 is located between the two locking arms 814. The fixing component 816 is located on the inner wall of one side of the movable shaft bracket 803. The fixing component 816 and the mounting component 824 are provided with the same electric telescopic rod 817.

[0028] Specifically, during clamping, the general-purpose motor 806 runs, driving the double-wire winding roller 810 to rotate, so that the double-wire winding roller 810 winds up the connecting cable 807, which in turn causes the connecting cable 807 to move the fixed shaft bracket 804, the movable shaft bracket 803, the fixed cable 802 and the tailstock bracket 801, so that the tailstock bracket 801 drives the top tailstock 3 to move on the guide rail 12 to clamp the transmission shaft body 5; After clamping, the electric telescopic rod 817 operates, driving the mounting component 824 to move. This causes the mounting component 824 to rotate the mounting shaft 815 and the locking arm 814, and with the rotation, the locking arm 814 separates from the locking block 813, thereby canceling the clamping fixation between the fixed shaft frame 804 and the movable shaft frame 803. This allows the center tailstock 3 to move axially. When the drive shaft body 5 undergoes axial thermal deformation due to turning, the deformation will cause the center tailstock 3 to move, further driving the tailstock bracket 801, the fixed cable 802, and the movable shaft frame 803 to move. This causes the movable shaft frame 803 to drive the connecting shaft column 822 to pull the center coil spring 821 set on the fixed shaft frame 804, while simultaneously causing the strong contraction spring 819 to stretch and deform (the self-resetting elastic force of the center coil spring 821 and the strong contraction spring 819 is used to maintain the clamping effect of the center tailstock 3), until the turning operation is completed. In specific application scenarios, the turning shaft variable unit 8 is suitable for the turning process of drive shafts. Specifically, the turning shaft variable unit 8 sets up a movable shaft support 803 and a fixed shaft support 804. After clamping, the locking arm 814 is driven by an electric telescopic rod 817 to separate from the locking block 813, eliminating the clamping connection between them. This allows the center tailstock 3 to gain axial movement. When the drive shaft undergoes axial thermal deformation due to heat during turning, the center tailstock 3 can move backward with the extension of the drive shaft, effectively releasing deformation stress and preventing the drive shaft from... The bending failure due to stress accumulation significantly improves the machining yield. At the same time, a top coil chamber 811 and a top coil spring 821 are provided on the fixed shaft bracket 804, and a strong contraction spring 819 is provided on the outside of the guide rod 812. During the axial floating process of the top tailstock 3, the self-resetting elastic force of the top coil spring 821 and the strong contraction spring 819 can continuously provide a stable clamping force, ensuring that the drive shaft is always reliably clamped. While preventing thermal expansion and over-positioning clamping, it also avoids the tailstock loosening from affecting the machining accuracy, thus ensuring the stability of stepped turning. It should be noted that, by effectively eliminating the risk of bending caused by axial thermal stress, the scrap rate of the drive shaft during the turning process is significantly reduced, while also protecting the machine tool and center from damage caused by abnormal additional loads.

[0029] Reference Figure 1 , Figure 3 , Figure 8 , Figure 9 and Figure 10 In a preferred embodiment, the turning vibration damping module 4 further includes: The frame component 401 is located on the top of the tool holder 9. Multiple shaft components 404 are arranged inside the frame component 401, and multiple damping arc arms 406 are respectively arranged on the multiple shaft components 404. Two servo motors 403 are symmetrically arranged on both sides of the frame member 401. The output shafts of the two servo motors 403 are respectively set at one end of two shaft members 404 through couplings.

[0030] In this invention, the turning vibration damping module 4 further includes: Multiple gear components 405 are respectively disposed on multiple shaft components 404, and two gear components 405 on the same side mesh with each other; Multiple mounting frames 402 are respectively mounted on multiple damping arc arms 406, and multiple damping rods 410 are respectively mounted inside the multiple mounting frames 402.

[0031] In this invention, the turning vibration damping module 4 further includes: Multiple connecting brackets 411 are respectively disposed at one end of multiple vibration damping rods 410, and each of the multiple connecting brackets 411 has a fixed shaft 408 inside; Multiple axle wheel components 409 are respectively disposed on multiple fixed shaft rods 408. Each axle wheel component 409 is provided with a contact pad layer 407, and the outer wall of each contact pad layer 407 is in contact with the outer wall of the transmission shaft body 5.

[0032] Specifically, during turning, a servo motor 403 on one side is activated according to the position of the tool, and the servo motor 403 drives the shaft 404 to rotate. Since the shaft 404 is equipped with a gear 405, the shaft 404 on the same side can drive the damping arc arm 406 to rotate synchronously. This causes the damping arc arm 406 to move the mounting frame 402, the damping rod 410, the shaft wheel 409, and the contact pad 407, until the contact pad 407 on the shaft wheel 409 contacts the outer wall of the transmission shaft body 5. At this time, the micro-vibrations generated during turning can be transmitted to the damping rod 410 through the contact pad 407, the shaft wheel 409, the fixed shaft 408, and the connecting bracket 411, and the vibration is damped. In specific application scenarios, the turning vibration damping module 4 is suitable for the turning process of the drive shaft. During the turning process, the turning vibration damping module 4 can make the damping arc arm 406 drive the shaft wheel 409 and the contact pad 407 to reliably contact the outer wall of the drive shaft body 5, thereby effectively transmitting the micro vibration generated during the cutting process to the damping rod 410 for absorption and buffering. This significantly suppresses turning chatter and reduces the adverse effects of vibration on the machining accuracy of the outer circle, end face and chamfer of the step, thereby improving the surface finish and dimensional consistency of the drive shaft step structure. At the same time, the turning vibration damping module 4 adopts a flexible contact method that combines the damping rod 410 and the contact pad 407. While providing stable support to suppress chatter, it can avoid the additional bending deformation of the drive shaft caused by rigid clamping. In addition, the contact pad 407 set on the shaft wheel 409 can effectively reduce scratches or indentations on the machined surface of the drive shaft, further protecting the surface quality of the workpiece. It should be noted that this module is integrated and installed on the tool holder 9, and drives the gear component 405 through the servo motor 403 to realize the synchronous rotation of multiple damping arc arms 406 on the same side. The damping arc arm 406 on the corresponding side can be selected to work according to the actual cutting position of the tool, realizing side-by-side, on-demand follow-type vibration suppression, which significantly improves the stability and machining efficiency of the drive shaft step turning process.

[0033] A process for turning a drive shaft step, using a drive shaft step turning machine tool as described above, includes the following steps: Step 1: During clamping, the general-purpose motor 806 runs, driving the double-wire winding roller 810 to rotate, so that the double-wire winding roller 810 winds up the connecting cable 807, which in turn causes the connecting cable 807 to move the fixed shaft bracket 804, the movable shaft bracket 803, the fixed cable 802 and the tailstock bracket 801, so that the tailstock bracket 801 drives the center tailstock 3 to move on the guide rail 12, and the center tailstock 3 cooperates with the fixed chuck 6 to clamp the transmission shaft body 5. Step 2: After clamping, the electric telescopic rod 817 operates, driving the mounting component 824 to rotate. This causes the mounting component 824 to rotate the mounting shaft 815 and the locking arm 814, and the locking arm 814 to separate from the locking block 813. This cancels the clamping connection between the fixed shaft frame 804 and the movable shaft frame 803, allowing the center tailstock 3 to move axially. When the drive shaft body 5 undergoes axial thermal deformation due to turning, the deformation causes the center tailstock 3 to move, further driving the tailstock bracket 801, the fixed cable 802, and the movable shaft frame 803 to move. This causes the movable shaft frame 803 to pull the center coil spring 821 on the fixed shaft frame 804 via the connecting shaft column 822, while simultaneously stretching and deforming the strong contraction spring 819 (the self-resetting elastic force of the center coil spring 821 and the strong contraction spring 819 is used to maintain the clamping effect of the center tailstock 3), and then perform turning operations until the turning operation is completed. Step 3: During turning, the servo motor 403 on one side is started according to the position of the tool. The servo motor 403 drives the shaft 404 to rotate. Since the shaft 404 is equipped with a gear 405, the shaft 404 on the same side can drive the damping arc arm 406 to rotate synchronously. This causes the damping arc arm 406 to move the mounting frame 402, the damping rod 410, the shaft wheel 409, and the contact pad 407 until the contact pad 407 on the shaft wheel 409 contacts the outer wall of the transmission shaft body 5. At this time, the micro-vibrations generated during turning can be transmitted to the damping rod 410 through the contact pad 407, the shaft wheel 409, the fixed shaft 408, and the connecting bracket 411, and the vibration is damped until the turning is completed. Step 4: After turning, remove the machined drive shaft body 5 from the center tailstock 3 and the fixed chuck 6, and collect it.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A step turning machine tool for drive shafts, characterized in that, include: Turning frame (1), two guide rails (12) are provided on the turning frame (1), and the same center tailstock (3) is slidably provided on the two guide rails (12). Two linear lead screws (10) are symmetrically arranged on both sides of the turning machine frame (1). Two guide rods (11) are also symmetrically arranged on both sides of the turning machine frame (1). Tool holders (9) are provided on the two guide rods (11) and the two linear lead screws (10). The two guide rods (11) are located below the two linear lead screws (10). Turning shaft change unit (8) is located inside the turning machine frame (1) and at the bottom of the center tailstock (3). The turning shaft change unit (8) includes a movable shaft frame (803) and a fixed shaft frame (804). A top coil chamber (811) is fixedly installed on the fixed shaft frame (804). A center coil spring (821) is installed inside the top coil chamber (811). Turning vibration damping module (4) is disposed on the top of tool holder (9). The turning vibration damping module (4) includes multiple damping arc arms (406) and multiple damping rods (410). The turning shaft variable unit (8) also includes: Tailstock bracket (801) is located at the bottom of the top tailstock (3). Two fixed cables (802) are provided on the tailstock bracket (801), and a movable shaft bracket (803) is provided on one end of the two fixed cables (802). Mounting bracket (805) is located inside the turning machine frame (1). A general-purpose motor (806) is mounted on the mounting bracket (805). The output shaft of the general-purpose motor (806) is connected to a double-wire winding roller (810) via a coupling. Two connecting cables (807) are mounted on the double-wire winding roller (810). Two fixed plate frames (808) are provided inside the turning machine frame (1). The two fixed plate frames (808) are provided with the same double groove guide wheel (809). The outer walls of the two connecting cables (807) are in contact with the inner walls of the double groove guide wheel (809). The fixed shaft frame (804) is provided on one end of the two connecting cables (807). Two guide holes (818) are symmetrically opened on one side of the movable shaft bracket (803); Two guide rods (812) are symmetrically arranged on one side of the fixed shaft bracket (804), and the outer walls of the two guide rods (812) are in contact with the interior of the two guide holes (818).

2. The drive shaft step turning machine tool according to claim 1, characterized in that, Also includes: A fixed chuck (6) is mounted on the turning machine frame (1), and a drive shaft body (5) is provided between the fixed chuck (6) and the center tailstock (3). Control screen (7) is mounted on the turning machine frame (1); Two stepper motors (2) are symmetrically arranged on both sides of the turning frame (1). The output shafts of the two stepper motors (2) are respectively set at one end of two linear lead screws (10) through couplings.

3. The drive shaft step turning machine tool according to claim 1, characterized in that, The turning shaft variable unit (8) also includes: A fixed central shaft (820) is provided on the top winding chamber (811), and one end of the top coil spring (821) is provided on the fixed central shaft (820); Two strong contraction springs (819) are respectively set on the outside of the two guide rods (812). One end of each of the two strong contraction springs (819) is set on the fixed shaft frame (804), and the other end of each of the two strong contraction springs (819) is set on the movable shaft frame (803). Both strong contraction springs (819) are located inside the movable shaft frame (803). Two locking blocks (813) are mounted on a fixed shaft bracket (804); A connecting post (822) is located inside the movable shaft bracket (803). The connecting post (822) is located between two strong contraction springs (819). One end of the connecting post (822) is located on the other end of the top coil spring (821).

4. A step turning machine tool for a drive shaft according to claim 3, characterized in that, The turning shaft variable unit (8) also includes: A fixed bracket (823) is provided on the top of the movable shaft frame (803). The fixed bracket (823) is provided with a mounting shaft (815). The mounting shaft (815) is provided with a mounting part (824) and two locking arms (814). The two locking arms (814) are respectively engaged with two locking blocks (813). The mounting part (824) is located between the two locking arms (814). The fixing member (816) is located on the inner wall of one side of the movable shaft frame (803). The fixing member (816) and the mounting member (824) are provided with the same electric telescopic rod (817).

5. A step turning machine tool for a drive shaft according to claim 2, characterized in that, The turning vibration damping module (4) also includes: A frame component (401) is disposed on the top of the tool holder (9). The frame component (401) is provided with multiple shaft components (404) inside, and multiple damping arc arms (406) are respectively disposed on the multiple shaft components (404). Two servo motors (403) are symmetrically arranged on both sides of the frame member (401), and the output shafts of the two servo motors (403) are respectively set at one end of two shaft members (404) through couplings.

6. A step turning machine tool for a drive shaft according to claim 5, characterized in that, The turning vibration damping module (4) also includes: Multiple gear components (405) are respectively disposed on multiple shaft components (404), and two gear components (405) on the same side mesh with each other; Multiple mounting frames (402) are respectively disposed on multiple damping arc arms (406), and multiple damping rods (410) are respectively disposed inside the multiple mounting frames (402).

7. A step turning machine tool for a drive shaft according to claim 6, characterized in that, The turning vibration damping module (4) also includes: Multiple connecting brackets (411) are respectively disposed at one end of multiple vibration damping rods (410), and each of the multiple connecting brackets (411) is provided with a fixed shaft (408). Multiple axle wheel components (409) are respectively disposed on multiple fixed shaft rods (408). Each of the multiple axle wheel components (409) is provided with a contact pad layer (407). The outer wall of each of the multiple contact pad layers (407) is in contact with the outer wall of the transmission shaft body (5).

8. A process for turning a drive shaft step, using a drive shaft step turning machine tool as described in claims 1-7, characterized in that, Includes the following steps: Step 1: The turning shaft transformer unit (8) runs to drive the center tailstock (3) to move, and the center tailstock (3) cooperates with the fixed chuck (6) to clamp the transmission shaft body (5); Step 2: After clamping, the turning shaft change unit (8) runs again to cancel the snap-fit ​​between the fixed shaft bracket (804) and the movable shaft bracket (803), so that the center tailstock (3) can obtain axial movement and perform turning. Step 3: During turning, the turning damping module (4) is activated so that the damping arc arm (406) drives the shaft wheel (409), the contact pad (407) to contact the transmission shaft body (5), so that the damping rod (410) is damped during turning until the turning is completed. Step 4: After turning, remove the machined drive shaft body (5) from the center tailstock (3) and the fixed chuck (6) and collect it.

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