Four-spindle special machine tool for machining knuckle

Abstract

The utility model discloses a special four-spindle machine tool for machining a steering knuckle, which relates to the technical field of steering knuckle machining machine tools and comprises a workpiece rotating system, a three-axis linear motion system, a tool magazine system, a spindle system and a chip removal system. The workpiece rotating system can achieve overturning and rotating of a workpiece and is matched with X-axis, Y-axis and Z-axis operation of the main shaft system, the five-axis directional machining function is achieved, and five-axis machining of the steering knuckle can be completed. Four workpieces are machined at the same time through the four spindles, the machining process is completed through five spindles in one sequence, four finished products can be obtained when the four workpieces are machined at the same time and one cycle machining is completed, so that the machining takt of a single piece is equal to 1 / 4 cycle time, and compared with conventional single-spindle machining and double-spindle machining, the four-spindle machining efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of steering knuckle machining machine tools, in particular to a four-spindle special machine tool for machining steering knuckles. Background Art

[0002] There are various types of steering knuckle machining equipment. Initially, the machining equipment for steering knuckle was a single-spindle single-table machine tool, but the machining efficiency of this type of machine tool is relatively low, and the manufacturing cost is high when processing in large quantities. With the maturity of foreign dual-spindle technology, more and more companies choose foreign dual-spindle machine tools to process steering knuckles. Although the efficiency is high, the equipment price is still expensive. There is still a gap in efficiency between domestic dual-spindle equipment. Based on this situation, this patent drives equipment innovation with process innovation, and provides a four-spindle special machine tool for processing steering knuckles. Compared with traditional dual-spindle machine tools, under the same drive technology, the four spindles can be processed simultaneously, and the processing efficiency is doubled. In addition, the equipment has strong versatility and high stability. This solution provides a new solution for improving efficiency and reducing costs in steering knuckle processing. Utility Model Content

[0003] The purpose of the utility model is to provide a four-spindle special machine tool for processing steering knuckles, which can efficiently process four steering knuckles at the same time, realize multi-piece clamping of steering knuckles, and complete the processing in one clamping, which is efficient and guarantees the processing accuracy. Compared with traditional dual-spindle processing machines, the efficiency is doubled.

[0004] In view of the above technical problems, the technical solution of the utility model is: a four-spindle special machine tool for machining steering knuckles, comprising a workpiece rotation system, a three-axis linear motion system, a tool magazine system, a spindle system and a chip removal system; the workpiece rotation system comprises an A-axis motor, the A-axis motor is installed on a machine base, the machine base is fixedly installed on a work box, the output end of the A-axis motor is fixedly connected to the A-axis turning table, and the A-axis turning table can be controlled to turn over by the A-axis motor, the C-axis torque motor I, the C-axis torque motor II, the C-axis torque motor III and the C-axis torque motor IV are evenly distributed on the A-axis turning table, the output end of the C-axis torque motor I is fixedly installed with the C-axis turntable I; the output end of the C-axis torque motor II is fixedly installed with the C-axis turntable II; the output end of the C-axis torque motor III is fixedly installed with the C-axis turntable III; the output end of the C-axis torque motor IV is fixedly installed with the C-axis turntable IV.

[0005] Furthermore, the three-axis linear motion system includes an X-axis guide rail, which is fixedly installed on the workbox, a first X-axis drive motor is fixedly installed on one side of the X-axis guide rail, the output shaft of the first X-axis drive motor and the first X-axis ball screw are fixedly installed, the first X-axis ball screw and the first X-axis slide are threadedly installed, the first X-axis slide is slidably installed on the X-axis guide rail, the first X-axis drive motor controls the first X-axis slide to move along the X-axis guide rail, and a second X-axis drive motor is fixedly installed on the other side of the X-axis guide rail, the output shaft of the second X-axis drive motor and the second X-axis ball screw are fixedly installed, the second X-axis ball screw and the second X-axis slide are threadedly installed, the second X-axis slide is also slidably installed on the X-axis guide rail, and the second X-axis drive motor controls the second X-axis slide to move along the X-axis guide rail.

[0006] Furthermore, the three-axis linear motion system also includes a first Y-axis motor and a second Y-axis motor, the first Y-axis motor and the second Y-axis motor are both fixed on the first X-axis slide, the output shaft of the first Y-axis motor and the first Y-axis ball screw are fixedly installed, the first Y-axis ball screw and the first Y-axis slide are threadedly installed, the first Y-axis slide is slidably installed on the first Y-axis guide rail, the first Y-axis guide rail is fixedly installed on the first X-axis slide, the output shaft of the second Y-axis motor and the second Y-axis ball screw are fixedly installed, the second Y-axis ball screw and the second Y-axis slide are threadedly installed, the second Y-axis slide is slidably installed on the second Y-axis guide rail, the second Y-axis guide rail is fixedly installed on the first X-axis slide, and the first Y-axis motor and the second Y-axis motor respectively drive the first Y-axis slide and the second Y-axis slide to move.

[0007] Furthermore, the three-axis linear motion system also includes a third Y-axis motor and a fourth Y-axis motor, both of which are fixed on the second X-axis slide, the output shaft of the third Y-axis motor and the third Y-axis ball screw are fixedly installed, the third Y-axis ball screw and the third Y-axis slide are threadedly installed, the third Y-axis slide is slidably installed on the third Y-axis guide rail, and the third Y-axis guide rail is fixedly installed on the second X-axis slide; the output shaft of the fourth Y-axis motor and the fourth Y-axis ball screw are fixedly installed, the fourth Y-axis ball screw and the fourth Y-axis slide are threadedly installed, the fourth Y-axis slide is slidably installed on the fourth Y-axis guide rail, and the fourth Y-axis guide rail is fixedly installed on the second X-axis slide; the third Y-axis motor and the fourth Y-axis motor respectively drive the third Y-axis slide and the fourth Y-axis slide to move.

[0008] Furthermore, the three-axis linear motion system also includes a first Z-axis motor, which is fixedly mounted on the first Y-axis slide, the output end of the first Z-axis motor is connected to the first Z-axis ball screw, the first Z-axis ball screw and the first Z-axis slide are threadedly mounted, the first Z-axis slide is slidably mounted on the first Z-axis guide rail, the first Z-axis guide rail is fixedly mounted on the first Y-axis slide, and the first Z-axis slide is controlled by the first Z-axis motor to realize Z-direction movement.

[0009] Furthermore, the three-axis linear motion system also includes a second Z-axis motor, which is fixedly mounted on the second Y-axis slide, the output end of the second Z-axis motor is connected to the second Z-axis ball screw, the second Z-axis ball screw and the second Z-axis slide are threadedly mounted, the second Z-axis slide is slidably mounted on the second Z-axis guide rail, the second Z-axis guide rail is fixedly mounted on the second Y-axis slide, and the second Z-axis slide is controlled by the second Z-axis motor to realize Z-direction movement.

[0010] Furthermore, the three-axis linear motion system also includes a third Z-axis motor, which is fixedly mounted on the third Y-axis slide, the output end of the third Z-axis motor is connected to the third Z-axis ball screw, the third Z-axis ball screw and the third Z-axis slide are threadedly mounted, the third Z-axis slide is slidably mounted on the third Z-axis guide rail, the third Z-axis guide rail is fixedly mounted on the third Y-axis slide, and the third Z-axis slide is controlled by the third Z-axis motor to realize Z-direction movement.

[0011] Furthermore, the three-axis linear motion system also includes a fourth Z-axis motor, which is fixedly mounted on a fourth Y-axis slide, the output end of the fourth Z-axis motor is connected to a fourth Z-axis ball screw, the fourth Z-axis ball screw and the fourth Z-axis slide are threadedly mounted, the fourth Z-axis slide is slidably mounted on a fourth Z-axis guide rail, the fourth Z-axis guide rail is fixedly mounted on the fourth Y-axis slide, and the fourth Z-axis slide is controlled by the fourth Z-axis motor to realize Z-direction movement.

[0012] Furthermore, the spindle system includes a first spindle, a second spindle, a third spindle and a fourth spindle. The first tool magazine supplies tools for the first spindle, the second tool magazine supplies tools for the second spindle, the third tool magazine supplies tools for the third spindle, and the fourth tool magazine supplies tools for the fourth spindle. The first spindle processes the workpiece on the C-axis turntable I, the second spindle processes the workpiece on the C-axis turntable II, the third spindle processes the workpiece on the C-axis turntable III, and the fourth spindle processes the workpiece on the C-axis turntable IV.

[0013] Compared with the prior art, the utility model has the following beneficial effects: (1) the workpiece rotation system of the utility model can realize the flipping and rotation of the workpiece, and cooperate with the XYZ three-axis operation of the spindle system to form a five-axis directional processing function, that is, it can complete the five-axis processing of the steering knuckle; (2) the utility model processes four workpieces simultaneously through four spindles, and the processing technology adopts five axes in one sequence. Since four workpieces are processed simultaneously, four finished products can be produced when one cycle of processing is completed. Therefore, the single-piece processing cycle is equal to 1 / 4 of the cycle time. Compared with conventional single-spindle processing and dual-spindle processing, four-spindle processing is more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a front view of a four-spindle special machine tool for machining steering knuckles.

[0015] Figure 2 The utility model is a top view of a four-spindle special machine tool for machining steering knuckles.

[0016] Figure 3 It is the front view of the three-axis linear motion system of the utility model.

[0017] Figure 4 It is a top view of the three-axis linear motion system of the utility model.

[0018] In the figure: 1-machine loading and unloading switch door; 2-chip conveyor; 3-A-axis motor; 4-machine base; 5-A-axis turning table; 6-C-axis torque motor Ⅰ; 7-C-axis torque motor Ⅱ; 8-C-axis torque motor Ⅲ; 9-C-axis torque motor Ⅳ; 10-C-axis turntable Ⅰ; 11-C-axis turntable Ⅱ; 12-C-axis turntable Ⅲ; 13-C-axis turntable Ⅳ; 14-first X-axis drive motor; 15-X-axis guide rail; 16-first X-axis ball screw; 1 7-first X-axis slide; 18-second X-axis drive motor; 19-second X-axis ball screw; 20-second X-axis slide; 21-first Y-axis motor; 22-first Y-axis guide; 23-first Y-axis slide; 24-second Y-axis motor; 25-second Y-axis guide; 26-second Y-axis slide; 27-third Y-axis motor; 28-third Y-axis guide; 29-third Y-axis slide; 30-fourth Y-axis motor; 31-fourth Y-axis Guide rail; 32-fourth Y-axis slide; 33-first Z-axis motor; 34-second Z-axis motor; 35-third Z-axis motor; 36-fourth Z-axis motor; 37-first tool magazine; 38-first Z-axis guide rail; 39-first Z-axis slide; 40-first spindle; 41-second Z-axis guide rail; 42-second Z-axis slide; 43-second spindle; 44-second tool magazine; 45-third tool magazine; 46-third Z-axis guide rail; 47-third Z-axis Slide; 48-third spindle; 49-fourth tool magazine; 50-fourth Z-axis guide rail; 51-fourth Z-axis slide; 52-fourth spindle; 53-first Y-axis ball screw; 54-second Y-axis ball screw; 55-third Y-axis ball screw; 56-fourth Y-axis ball screw; 57-first Z-axis ball screw; 58-second Z-axis ball screw; 59-third Z-axis ball screw; 60-fourth Z-axis ball screw; 61-work box. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0020] Example: Figure 1-Figure 4A four-spindle special machine tool for machining steering knuckles is shown, comprising a work box 61, a machine loading and unloading switch door 1, a workpiece rotation system, a three-axis linear motion system, a tool magazine system, a spindle system and a chip removal system. The work box 61 is provided with the workpiece rotation system, the three-axis linear motion system and the chip removal system. The chip removal system comprises a chip conveyor 2, which is arranged on the work box 61. The three-axis linear motion system is provided with the tool magazine system and the spindle system. A machine loading and unloading switch door 1 is arranged on the side of the work box 61, and the machine loading and unloading switch door 1 is located on the side close to the workpiece rotation system. The workpiece rotation system can realize the flipping and rotation of the workpiece, and cooperates with the XYZ three-axis operation of the spindle system to form a five-axis directional machining function, that is, it can complete the five-axis machining of the steering knuckle.

[0021] The workpiece rotation system includes: an A-axis motor 3, a machine base 4, an A-axis flip table 5, a C-axis torque motor Ⅰ6, a C-axis torque motor Ⅱ7, a C-axis torque motor Ⅲ8, a C-axis torque motor Ⅳ9, a C-axis turntable Ⅰ10, a C-axis turntable Ⅱ11, a C-axis turntable Ⅲ12 and a C-axis turntable Ⅳ13. The A-axis motor 3 is installed on the machine base 4, and the machine base 4 is fixedly installed on the work box 61. The output end of the A-axis motor 3 is fixedly connected to the A-axis flip table 5. The A-axis flip table 5 can be controlled to flip through the A-axis motor 3, and the flip angle is greater than 180°. The C-axis torque motor Ⅰ6, the C-axis torque motor Ⅱ7, the C-axis torque motor Ⅲ8 and the C-axis torque motor Ⅳ9 are evenly distributed on the A-axis flip table 5. The output end of the C-axis torque motor Ⅰ6 A C-axis turntable Ⅰ10 is fixedly installed at the output end to control its rotation, and the rotation angle is 360°; a C-axis turntable Ⅱ11 is fixedly installed at the output end of the C-axis torque motor Ⅱ7 to control its rotation, and the rotation angle is 360°; a C-axis turntable Ⅲ12 is fixedly installed at the output end of the C-axis torque motor Ⅲ8 to control its rotation, and the rotation angle is 360°; a C-axis turntable Ⅳ13 is fixedly installed at the output end of the C-axis torque motor Ⅳ9 to control its rotation, and the rotation angle is 360°; the center distance between the C-axis turntable Ⅰ10 and the C-axis turntable Ⅱ11 is 400mm, the center distance between the C-axis turntable Ⅱ11 and the C-axis turntable Ⅲ12 is 400mm, and the center distance between the C-axis turntable Ⅲ12 and the C-axis turntable Ⅳ13 is 400mm. The five-axis one-sequence process can be used to process four workpieces at a time. The process layout of the four workpieces is as follows: the left steering knuckle is clamped on the C-axis turret Ⅰ10 and the C-axis turret Ⅱ11, and the right steering knuckle is clamped on the C-axis turret Ⅲ12 and the C-axis turret Ⅳ13. The process layout of the four workpieces is realized through four C-axis turrets. The four workpieces are 2 left parts and 2 right parts.

[0022] The three-axis linear motion system includes: a first X-axis drive motor 14, an X-axis guide rail 15, a first X-axis ball screw 16, a first X-axis slide 17, a second X-axis drive motor 18, a second X-axis ball screw 19, a second X-axis slide 20, a first Y-axis motor 21, a first Y-axis guide rail 22, a first Y-axis slide 23, a second Y-axis motor 24, a second Y-axis guide rail 25, a second Y-axis slide 26, a third Y-axis motor 27, a third Y-axis guide rail 28, a third Y-axis slide 29, a fourth Y-axis motor 30, a fourth Y Axis guide rail 31, fourth Y-axis slide 32, first Z-axis motor 33, second Z-axis motor 34, third Z-axis motor 35, fourth Z-axis motor 36, first Z-axis guide rail 38, first Z-axis slide 39, second Z-axis guide rail 41, second Z-axis slide 42, third Z-axis guide rail 46, third Z-axis slide 47, fourth Z-axis guide rail 50, fourth Z-axis slide 51, first Y-axis ball screw 53, second Y-axis ball screw 54, third Y-axis ball screw 55, fourth Y-axis ball screw 56, first Z-axis ball screw The first X-axis ball screw 16 is fixedly mounted on the first X-axis slide 17, and the first X-axis ball screw 16 is fixedly mounted on the first X-axis slide 17. The first X-axis ball screw 16 is threadedly mounted on the first X-axis slide 17, and the first X-axis slide 17 is slidably mounted on the X-axis guide rail 15. The first X-axis drive motor 14 controls the first X-axis slide 17 to rotate. The table 17 moves along the X-axis guide rail 15, and a second X-axis drive motor 18 is fixedly installed on the other side of the X-axis guide rail 15. The output shaft of the second X-axis drive motor 18 and the second X-axis ball screw 19 are fixedly installed. The second X-axis ball screw 19 is threadedly installed with the second X-axis slide 20. The second X-axis slide 20 is also slidably installed on the X-axis guide rail 15. The second X-axis drive motor 18 controls the second X-axis slide 20 to move along the X-axis guide rail 15. The first X-axis slide 17 and the second X-axis slide 20 share the X-axis guide rail 15.

[0023] The first Y-axis motor 21 and the second Y-axis motor 24 are both fixed on the first X-axis slide 17, the output shaft of the first Y-axis motor 21 and the first Y-axis ball screw 53 are fixedly installed, the first Y-axis ball screw 53 and the first Y-axis slide 23 are threadedly installed, the first Y-axis slide 23 is slidably installed on the first Y-axis guide rail 22, the first Y-axis guide rail 22 is fixedly installed on the first X-axis slide 17, the output shaft of the second Y-axis motor 24 and the second Y-axis ball screw 54 are fixedly installed, the second Y-axis ball screw 54 and the second Y-axis slide 26 are threadedly installed, the second Y-axis slide 26 is slidably installed on the second Y-axis guide rail 25, the second Y-axis guide rail 25 is fixedly installed on the first X-axis slide 17, the first Y-axis motor 21 and the second Y-axis motor 24 respectively drive the first Y-axis slide 23 and the second Y-axis slide 26 to move.

[0024] The third Y-axis motor 27 and the fourth Y-axis motor 30 are both fixed on the second X-axis slide 20, the output shaft of the third Y-axis motor 27 and the third Y-axis ball screw 55 are fixedly installed, the third Y-axis ball screw 55 and the third Y-axis slide 29 are threadedly installed, the third Y-axis slide 29 is slidably installed on the third Y-axis guide rail 28, and the third Y-axis guide rail 28 is fixedly installed on the second X-axis slide 20; the output shaft of the fourth Y-axis motor 30 and the fourth Y-axis ball screw 56 are fixedly installed, the fourth Y-axis ball screw 56 and the fourth Y-axis slide 32 are threadedly installed, the fourth Y-axis slide 32 is slidably installed on the fourth Y-axis guide rail 31, and the fourth Y-axis guide rail 31 is fixedly installed on the second X-axis slide 20; the third Y-axis motor 27 and the fourth Y-axis motor 30 respectively drive the third Y-axis slide 29 and the fourth Y-axis slide 32 to move.

[0025] The first Z-axis motor 33 is fixedly mounted on the first Y-axis slide 23, the output end of the first Z-axis motor 33 is connected to the first Z-axis ball screw 57, the first Z-axis ball screw 57 and the first Z-axis slide 39 are threadedly mounted, the first Z-axis slide 39 is slidably mounted on the first Z-axis guide rail 38, the first Z-axis guide rail 38 is fixedly mounted on the first Y-axis slide 23, and the first Z-axis slide 39 is controlled by the first Z-axis motor 33 to realize Z-direction movement.

[0026] The second Z-axis motor 34 is fixedly mounted on the second Y-axis slide 26, and the output end of the second Z-axis motor 34 is connected to the second Z-axis ball screw 58, the second Z-axis ball screw 58 and the second Z-axis slide 42 are threadedly mounted, the second Z-axis slide 42 is slidably mounted on the second Z-axis guide rail 41, and the second Z-axis guide rail 41 is fixedly mounted on the second Y-axis slide 26, and the second Z-axis slide 42 is controlled by the second Z-axis motor 34 to realize Z-direction movement.

[0027] The third Z-axis motor 35 is fixedly mounted on the third Y-axis slide 29, the output end of the third Z-axis motor 35 is connected to the third Z-axis ball screw 59, the third Z-axis ball screw 59 and the third Z-axis slide 47 are threadedly mounted, the third Z-axis slide 47 is slidably mounted on the third Z-axis guide rail 46, the third Z-axis guide rail 46 is fixedly mounted on the third Y-axis slide 29, and the third Z-axis slide 47 is controlled by the third Z-axis motor 35 to realize Z-direction movement.

[0028] The fourth Z-axis motor 36 is fixedly mounted on the fourth Y-axis slide 32, the output end of the fourth Z-axis motor 36 is connected to the fourth Z-axis ball screw 60, the fourth Z-axis ball screw 60 and the fourth Z-axis slide 51 are threadedly mounted, the fourth Z-axis slide 51 is slidably mounted on the fourth Z-axis guide rail 50, the fourth Z-axis guide rail 50 is fixedly mounted on the fourth Y-axis slide 32, and the fourth Z-axis slide 51 is controlled by the fourth Z-axis motor 36 to realize Z-direction movement.

[0029] The tool magazine system includes: a first tool magazine 37, a second tool magazine 44, a third tool magazine 45 and a fourth tool magazine 49, and the spindle system includes a first spindle 40, a second spindle 43, a third spindle 48 and a fourth spindle 52. The first tool magazine 37 supplies tools for the first spindle 40, the second tool magazine 44 supplies tools for the second spindle 43, the third tool magazine 45 supplies tools for the third spindle 48, and the fourth tool magazine 49 supplies tools for the fourth spindle 52. The first spindle 40 processes the workpiece on the C-axis turntable Ⅰ10, the second spindle 43 processes the workpiece on the C-axis turntable Ⅱ11, the third spindle 48 processes the workpiece on the C-axis turntable Ⅲ12, and the fourth spindle 52 processes the workpiece on the C-axis turntable Ⅳ13. The center distance between the first spindle 40 and the second spindle 43 is fixed at 400 mm, and the second spindle 43 follows the first spindle 40 during processing; the center distance between the third spindle 48 and the fourth spindle 52 is fixed at 400 mm, and the fourth spindle 52 follows the third spindle 48 during processing.

[0030] The working process of a four-spindle special machine tool for machining steering knuckles is as follows: an operator loads materials from the machine tool loading and unloading switch door 1 position, clamping four pieces at a time, two left pieces are placed on C-axis turntable Ⅰ10 and C-axis turntable Ⅱ11, and two right pieces are placed on C-axis turntable Ⅲ12 and C-axis turntable Ⅳ13. During machining, the four C-axis turntables rotate synchronously, and the same machined features on the four workpieces are all in a vertical posture with the spindles. The four workpieces are machined simultaneously by the four spindles, and the machining process is completed by five axes in one sequence. Since the four workpieces are machined simultaneously, four finished products can be produced when one cycle of machining is completed. Therefore, the single-piece machining cycle is equal to 1 / 4 of the cycle time. Compared with conventional single-spindle machining and dual-spindle machining, the four-spindle machining efficiency is higher.

Claims

1. A four-spindle special machine tool for machining steering knuckles, characterized in that: It includes workpiece rotation system, three-axis linear motion system, tool magazine system, spindle system and chip removal system; The workpiece rotation system comprises an A-axis motor (3), wherein the A-axis motor (3) is mounted on a machine base (4), and the machine base (4) is fixedly mounted on a work box (61). The output end of the A-axis motor (3) is fixedly connected to an A-axis turning table (5), and the turning of the A-axis turning table (5) can be controlled by the A-axis motor (3). A C-axis torque motor I (6), a C-axis torque motor II (7), a C-axis torque motor III (8), and a C-axis torque motor IV (9) are evenly distributed on the A-axis turning table (5). The output end of the C-axis torque motor I (6) is fixedly mounted with a C-axis turntable I (10); the output end of the C-axis torque motor II (7) is fixedly mounted with a C-axis turntable II (11); the output end of the C-axis torque motor III (8) is fixedly mounted with a C-axis turntable III (12); and the output end of the C-axis torque motor IV (9) is fixedly mounted with a C-axis turntable IV (13).

2. A four-spindle special machine tool for machining steering knuckles as claimed in claim 1, characterized in that: The three-axis linear motion system comprises an X-axis guide rail (15), wherein the X-axis guide rail (15) is fixedly mounted on a work box (61), a first X-axis drive motor (14) is fixedly mounted on one side of the X-axis guide rail (15), an output shaft of the first X-axis drive motor (14) and a first X-axis ball screw (16) are fixedly mounted, the first X-axis ball screw (16) and a first X-axis slide table (17) are threadedly mounted, the first X-axis slide table (17) is slidably mounted on the X-axis guide rail (15), and the first X-axis drive motor (14) controls the first The X-axis slide (17) moves along the X-axis guide rail (15); a second X-axis drive motor (18) is fixedly mounted on the other side of the X-axis guide rail (15); an output shaft of the second X-axis drive motor (18) and a second X-axis ball screw (19) are fixedly mounted; the second X-axis ball screw (19) and the second X-axis slide (20) are threadedly mounted; the second X-axis slide (20) is also slidably mounted on the X-axis guide rail (15); the second X-axis drive motor (18) controls the second X-axis slide (20) to move along the X-axis guide rail (15).

3. A four-spindle special machine tool for machining steering knuckles as claimed in claim 2, characterized in that: The three-axis linear motion system further comprises a first Y-axis motor (21) and a second Y-axis motor (24), the first Y-axis motor (21) and the second Y-axis motor (24) are both fixed on the first X-axis slide (17), the output shaft of the first Y-axis motor (21) and the first Y-axis ball screw (53) are fixedly mounted, the first Y-axis ball screw (53) and the first Y-axis slide (23) are threadedly mounted, the first Y-axis slide (23) is slidably mounted on the first Y-axis guide rail (22), and the first Y-axis guide rail (22) is fixedly mounted on the first X-axis slide (17). On the first X-axis slide (17), the output shaft of the second Y-axis motor (24) and the second Y-axis ball screw (54) are fixedly installed, the second Y-axis ball screw (54) and the second Y-axis slide (26) are threadedly installed, the second Y-axis slide (26) is slidably installed on the second Y-axis guide rail (25), the second Y-axis guide rail (25) is fixedly installed on the first X-axis slide (17), and the first Y-axis motor (21) and the second Y-axis motor (24) respectively drive the first Y-axis slide (23) and the second Y-axis slide (26) to move.

4. A four-spindle special machine tool for machining steering knuckles as claimed in claim 3, characterized in that: The three-axis linear motion system further comprises a third Y-axis motor (27) and a fourth Y-axis motor (30); the output shaft of the third Y-axis motor (27) and the third Y-axis ball screw (55) are fixedly mounted; the third Y-axis ball screw (55) and the third Y-axis slide (29) are threadedly mounted; the third Y-axis slide (29) is slidably mounted on the third Y-axis guide rail (28); the third Y-axis guide rail (28) is fixedly mounted on the second X-axis slide (20); the fourth Y-axis motor ( The output shaft of the second X-axis slide (20) and the fourth Y-axis ball screw (56) are fixedly installed, the fourth Y-axis ball screw (56) and the fourth Y-axis slide (32) are threadedly installed, the fourth Y-axis slide (32) is slidably installed on the fourth Y-axis guide rail (31), and the fourth Y-axis guide rail (31) is fixedly installed on the second X-axis slide (20); the third Y-axis motor (27) and the fourth Y-axis motor (30) respectively drive the third Y-axis slide (29) and the fourth Y-axis slide (32) to move.

5. A four-spindle special machine tool for machining steering knuckles as claimed in claim 4, characterized in that: The three-axis linear motion system further comprises a first Z-axis motor (33), the first Z-axis motor (33) being fixedly mounted on the first Y-axis slide (23), the output end of the first Z-axis motor (33) being connected to the first Z-axis ball screw (57), the first Z-axis ball screw (57) and the first Z-axis slide (39) being threadedly mounted, the first Z-axis slide (39) being slidably mounted on the first Z-axis guide rail (38), the first Z-axis guide rail (38) being fixedly mounted on the first Y-axis slide (23), and the first Z-axis slide (39) being controlled by the first Z-axis motor (33) to achieve Z-direction motion.

6. A four-spindle special machine tool for machining steering knuckles as claimed in claim 5, characterized in that: The three-axis linear motion system further comprises a second Z-axis motor (34), the second Z-axis motor (34) being fixedly mounted on the second Y-axis slide (26), the output end of the second Z-axis motor (34) being connected to a second Z-axis ball screw (58), the second Z-axis ball screw (58) and the second Z-axis slide (42) being threadedly mounted, the second Z-axis slide (42) being slidably mounted on a second Z-axis guide rail (41), the second Z-axis guide rail (41) being fixedly mounted on the second Y-axis slide (26), and the second Z-axis slide (42) being controlled by the second Z-axis motor (34) to achieve Z-direction motion.

7. A four-spindle special machine tool for machining steering knuckles as claimed in claim 6, characterized in that: The three-axis linear motion system further comprises a third Z-axis motor (35), the third Z-axis motor (35) is fixedly mounted on the third Y-axis slide (29), the output end of the third Z-axis motor (35) is connected to a third Z-axis ball screw (59), the third Z-axis ball screw (59) and the third Z-axis slide (47) are threadedly mounted, the third Z-axis slide (47) is slidably mounted on a third Z-axis guide rail (46), the third Z-axis guide rail (46) is fixedly mounted on the third Y-axis slide (29), and the third Z-axis slide (47) is controlled by the third Z-axis motor (35) to achieve Z-direction motion.

8. A four-spindle special machine tool for machining steering knuckles as claimed in claim 7, characterized in that: The three-axis linear motion system further comprises a fourth Z-axis motor (36), the fourth Z-axis motor (36) being fixedly mounted on the fourth Y-axis slide (32), the output end of the fourth Z-axis motor (36) being connected to a fourth Z-axis ball screw (60), the fourth Z-axis ball screw (60) and the fourth Z-axis slide (51) being threadedly mounted, the fourth Z-axis slide (51) being slidably mounted on a fourth Z-axis guide rail (50), the fourth Z-axis guide rail (50) being fixedly mounted on the fourth Y-axis slide (32), and the fourth Z-axis slide (51) being controlled by the fourth Z-axis motor (36) to achieve Z-direction motion.

9. A four-spindle special machine tool for machining steering knuckles as claimed in claim 1, characterized in that: The spindle system comprises a first spindle (40), a second spindle (43), a third spindle (48) and a fourth spindle (52); the first tool magazine (37) supplies tools for the first spindle (40), the second tool magazine (44) supplies tools for the second spindle (43), the third tool magazine (45) supplies tools for the third spindle (48), and the fourth tool magazine (49) supplies tools for the fourth spindle (52); the first spindle (40) processes a workpiece on a C-axis turret I (10), the second spindle (43) processes a workpiece on a C-axis turret II (11), the third spindle (48) processes a workpiece on a C-axis turret III (12), and the fourth spindle (52) processes a workpiece on a C-axis turret IV (13).

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