A double-end face cutting machine tool and method based on a rack of a vehicle steering engine

Abstract

The present application relates to a kind of based on automobile direction machine rack bidirectional end face cutting machine tool and method.It solves the technical problems such as the need for multiple clamping and adjustment of existing two end face processing, the need for adjustment and tooling fixture replacement when replacing processing rack, etc.It includes machine tool bed, the installation seat with inclined installation surface is arranged on the upper end of machine tool bed, inclined installation surface both ends are respectively provided with processing seat body, seat body driving structure is arranged between installation seat and processing seat body, workpiece clamp group is arranged between two processing seat bodies, workpiece clamp group is divided into main clamp assembly and auxiliary clamp assembly, main clamp assembly is fixedly connected with installation seat, auxiliary clamp assembly is movably connected with installation seat by length adjusting drive assembly, processing seat body one end is provided with any one or more combinations of screw assembly, milling cutter assembly drilling assembly and length positioning assembly.The advantage is that: the movement of auxiliary clamp seat is controlled by length adjusting drive assembly, so that a variety of length workpieces can be covered between main clamp seat and auxiliary clamp seat.

Description

Technical Field

[0001] This invention belongs to the technical field of steering gear rack processing equipment, specifically relating to a bidirectional end face cutting machine tool and method for automotive steering gear racks. Background Technology

[0002] With the continuous development of the automotive industry, higher requirements are being placed on the machining accuracy and production efficiency of automotive parts. As a key component of the automotive steering system, the machining accuracy and production efficiency of automotive steering racks directly affect the steering performance and overall quality of the vehicle. In existing technologies, conventional machine tools can only machine one end face at a time when machining the outer diameter, drilling, or threading the two end faces of shaft-type parts. Completing the machining of two end faces requires multiple clamping and adjustments, resulting in long machining times and low production efficiency. Furthermore, conventional machine tools have poor adaptability to different specifications of steering racks, requiring extensive adjustments and tooling changes when changing the machined rack. This makes it impossible to fully cover multiple length specifications of a single part, hindering the ability to meet the demands of mass production. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a bidirectional end face cutting machine tool based on automotive steering rack.

[0004] Another objective of this invention is to address the aforementioned problems by providing a bidirectional end face cutting method for automotive steering racks.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a machine tool for bidirectional end face cutting of automotive steering rack, comprising a machine tool bed, wherein the upper end of the machine tool bed is provided with a mounting seat having an inclined mounting surface, and machining seats are respectively provided at both ends of the inclined mounting surface. A seat driving structure is provided between the mounting seat and the machining seats, which can drive the machining seats to move along the length direction and the width direction of the mounting seat. A workpiece fixture assembly is provided between the two machining seats, wherein the workpiece fixture assembly comprises a main fixture assembly and a secondary fixture assembly. The main fixture assembly is fixedly connected to the mounting seat, and the secondary fixture assembly is movably connected to the mounting seat through a length adjustment driving assembly that can move the secondary fixture assembly closer to or further away from the main fixture assembly. The machining seats are provided with any one or more combinations of a thread assembly, a milling cutter assembly, a drilling assembly, and a length positioning assembly at the end near the workpiece fixture assembly. Both machining seats are equipped with threading assemblies, milling cutter assemblies, and drilling assemblies. Driven by the seat drive structure, both ends of the rack can be machined, reducing changeover time and improving production efficiency. At the same time, the length adjustment drive assembly is used to control the distance between the main fixture assembly and the auxiliary fixture assembly, which can be flexibly adjusted according to different rack specifications, thus ensuring the efficient operation of the bidirectional end face cutting machine tool.

[0006] In the aforementioned machine tool for bidirectional end-face cutting of automotive steering racks, the main clamping assembly includes a main clamping seat. The main clamping seat has a mounting protrusion on the side away from the mounting base, and a mounting notch on one side of the mounting protrusion. Main synchronizing clamps are located at both ends of the mounting protrusion. Clamping mounting grooves corresponding to the ends of the main clamping seat are located on both sides of the inclined mounting surface. The secondary clamping assembly includes a secondary clamping seat, and secondary synchronizing clamps, corresponding one-to-one with the main synchronizing clamps, are located at both ends of the secondary clamping seat on the side away from the mounting base. The main and secondary synchronizing clamps are used to fix the ends of the rack, ensuring the stability of the rack.

[0007] In the aforementioned bidirectional end-face cutting machine tool based on an automotive steering rack, the length adjustment drive assembly includes several clamping sliders disposed at both ends of the sub-clamp seat near the mounting base. Several X-axis guide rails are respectively provided on both sides of the inclined mounting surface. The clamping sliders are connected to the X-axis guide rails. A reducer support plate is provided at one end of the sub-clamp seat, and a clamping drive motor is mounted on the reducer support plate. A clamping drive rack, connected to the clamping drive gear of the clamping drive motor, is provided on the side of the mounting base near the reducer support plate and away from the inclined mounting surface. The cooperation between the clamping drive motor and the clamping drive rack controls the movement of the sub-clamp seat, thereby adjusting the position of the sub-clamp seat according to the length of the rack, improving practicality.

[0008] In the aforementioned bidirectional end face cutting machine tool based on automotive steering rack, the two ends of the mounting notch are respectively provided with workpiece axial positioning components corresponding to the main synchronizing clamp. The workpiece axial positioning component has a fixed seat, one end of which is connected to the main clamp seat. A positioning seat and a pressure rod seat are respectively provided on one side of the fixed seat. A positioning rod with positioning teeth is movably provided on the positioning seat through an elastic movable mounting structure. A pressure rod body that can swing circumferentially in the direction of the positioning rod and can be pressed down in the direction of the positioning rod is provided on the pressure rod seat through a spinning drive structure. A steering rack is provided between the main synchronizing clamp and the auxiliary synchronizing clamp at the same end, and the teeth of the steering rack correspond to the positioning teeth. The pressure rod body moves above the positioning rod and downwards via a spinning drive structure, thereby pressing the positioning rod and pressure rod body against the steering rack. Simultaneously, the positioning teeth ensure that the steering rack does not move axially, improving machining stability. The fixed seat is wedge-shaped and has an inclined mounting portion on one side. The positioning seat and pressure rod seat are respectively mounted on the inclined mounting portion. The inclined mounting portion has a positioning seat mounting hole. One end of the positioning seat is rotatably mounted within the positioning seat mounting hole, and a positioning seat locking structure is provided between the positioning seat and the fixed seat. The positioning seat locking structure includes several positioning seat locking holes radially located on one side of the fixed seat and communicating with the positioning seat mounting hole. Several positioning seat locking bolts abut against the outer side of the positioning seat are provided within the positioning seat locking holes. The inclined mounting portion has scale lines located circumferentially outside the positioning seat mounting hole, and the outer side of the positioning seat has marking lines corresponding to the scale lines. This rational design structure makes the machining process smoother, reduces adjustments and finishing during machining, and thus improves production efficiency.

[0009] In the aforementioned machine tool for bidirectional end face cutting of automotive steering rack, the elastic movable mounting structure includes a positioning rod movable hole disposed within a fixed seat and coaxially connected to the mounting hole of a positioning seat. The positioning rod is movably inserted into the positioning seat via an elastic movable mounting assembly. The positioning seat is cylindrical, with its upper end closed and its lower end open. The upper end of the positioning rod extends out of the upper end of the positioning seat, and the lower end of the positioning rod extends out of the lower end of the positioning seat and into the positioning rod movable hole. The elastic movable mounting assembly includes a limiting part disposed on the circumferential outer side of the positioning rod and located within the positioning seat. The lower end of the positioning seat is closed by an end cap, and the lower end of the positioning rod penetrates the end cap. A return spring is sleeved on the positioning rod, with one end of the return spring acting on the limiting part and the other end acting on the end cap. When the positioning rod moves downwards, the return spring tightens, simultaneously applying an upward reaction force to the positioning rod to ensure its stability. The diameter of the mounting hole in the positioning seat is equal to the diameter of the positioning seat. The upper end of the positioning seat has an upper through-hole for the upper end of the positioning rod to pass through, and a sealing ring abuts against the outer side of the positioning rod on the inner circumferential side of the upper through-hole. The end cap has a lower through-hole for the lower end of the positioning rod to pass through. The end cap is inserted into the lower opening of the positioning seat, and the lower outer side of the positioning seat has a radially arranged end cap positioning hole, with an end cap positioning bolt abutting against the outer side of the end cap. The end cap is fixed by the end cap positioning bolt, ensuring a firm connection between the end cap and the positioning seat and guaranteeing the normal operation of the return spring.

[0010] In the aforementioned bidirectional end-face cutting machine tool based on automotive steering rack, one side of the fixed base has a strip-shaped detection hole communicating with the movable hole of the positioning rod. A sensor fixing seat is provided on one side of the fixed base via a positioning locking bolt. The sensor fixing seat has a sensor fixing hole corresponding to the strip-shaped detection hole. A position sensor, inserted into the strip-shaped detection hole and corresponding to the outer side of the positioning rod, is installed in the sensor fixing hole. The pressure rod seat is fixed to the inclined mounting part by several mounting bolts. The spinning drive structure is a rotary pressing cylinder mounted on the pressure rod seat, and one end of the pressure rod body is fixed to the cylinder rod of the rotary pressing cylinder. The upper end of the positioning rod has a dovetail-shaped mounting groove, and the lower end of the positioning tooth is set in the mounting groove. The positioning tooth is fixedly connected to the mounting groove by fixing bolts. The positioning tooth is installed in the mounting groove and fixed by fixing bolts. This structural design facilitates the disassembly and replacement of the positioning tooth, improving practicality.

[0011] In the aforementioned bidirectional end-face cutting machine tool based on automotive steering rack, the seat drive structure includes a seat drive groove axially disposed within a mounting base. X-axis lead screw drive assemblies are respectively provided at both ends of the seat drive groove. X-axis slides connected to the X-axis lead screw drive assemblies are respectively provided at both ends of the mounting base. Several X-axis sliders connected to X-axis guide rails are respectively provided at both ends of the X-axis slides near the mounting base. A Y-axis slide is provided on the side of the X-axis slide away from the mounting base. A Y-axis lead screw drive assembly connected to the Y-axis slide is disposed within the X-axis slide. Y-axis guide rails are respectively provided on both sides of the Y-axis lead screw drive assembly. Several Y-axis sliders connected to the Y-axis guide rails are respectively provided on the side of the Y-axis slide near the X-axis slide. The machining seat is disposed on the side of the Y-axis slide away from the X-axis slide.

[0012] A method for bidirectional end face cutting of automotive steering rack, comprising the following steps:

[0013] S1. The length positioning component measures the length of the rack blank, the machining base rough-machines the end faces of both ends of the rack blank, and after the end faces are machined, the center holes of both ends of the rack blank are machined.

[0014] S2. Remove the rack blank and send it to a gear machining machine to perform gear machining on the rack blank, thereby obtaining a steering gear rack with teeth.

[0015] S3. After the gear teeth are machined, the steering rack is placed on the main fixture assembly and the auxiliary fixture assembly. The workpiece axial positioning assembly axially positions the steering rack. Through the center hole machined in the rough machining, the thread assembly, milling cutter assembly and drilling assembly on the machining base are used to finish mill, drill and tap the two ends of the steering rack.

[0016] In the above-mentioned bidirectional end face cutting method for automotive steering rack, in step S1, the length positioning component measures the length of the rack blank and calculates the machining data required for roughing and finishing based on the measured length, thereby ensuring the machining accuracy of the steering rack.

[0017] In the above-mentioned bidirectional end face cutting method for automotive steering rack, after the rack blank is machined with teeth in steps S2-S3, it is directly installed on the main fixture assembly and the auxiliary fixture assembly through the rough-machined center hole. The workpiece axial positioning assembly axially positions the steering rack, and then the machining seat performs finish machining on both ends of the steering rack.

[0018] Compared with existing technologies, the advantages of this invention are:

[0019] 1. This device controls the movement of the secondary fixture seat through a length adjustment drive component, allowing workpieces of various lengths to be covered between the main fixture seat and the secondary fixture seat. It has a simple structure, reduces manual intervention, lowers labor intensity, and thus controls machine tool costs.

[0020] 2. The device has machining seats installed at both ends, which allows the flat section and drilling to be carried out simultaneously, shortening the machining time, improving machining efficiency, and significantly reducing costs. Furthermore, through high-precision synchronous control, the symmetry and consistency of cutting at both ends can be ensured.

[0021] 3. This device fixes the steering rack through the positioning seat and the pressure rod seat, ensuring that it maintains a fixed position during the processing and avoiding dimensional deviations caused by inaccurate positioning, thereby improving processing accuracy and efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a structural schematic diagram from another perspective of the present invention.

[0024] Figure 3 This is the invention Figure 1 Enlarged view of the structure at point A in the middle.

[0025] Figure 4 This is an exploded view of the positioning seat in this invention.

[0026] Figure 5 This is a schematic diagram of the structure of the fixing base in this invention.

[0027] Figure 6 This is a schematic diagram of the length adjustment drive component in this invention.

[0028] Figure 7 This is an exploded view of the seat drive structure in this invention.

[0029] In the diagram: 1. Machine tool bed; 11. Mounting seat; 12. Angled mounting surface; 13. Machining seat; 14. Thread assembly; 15. Milling cutter assembly; 16. Drilling assembly; 17. Fixture mounting slot; 18. X-axis guide rail; 19. Steering gear rack; 20. Length positioning assembly; 21. Seat drive structure; 22. Seat drive slot; 23. X-axis lead screw drive assembly; 24. X-axis slide; 25. X-axis slider; 26. Y-axis slide; 27. Y-axis lead screw drive assembly; 28. Y-axis guide rail; 29. ​​Y-axis slider; 30. Workpiece fixture assembly; 31. Main fixture assembly; 32. Secondary fixture assembly; 33. Main fixture seat; 34. Mounting protrusion; 35. Mounting notch; 36. Main synchronizer clamp; 37. Secondary fixture seat; 38. Secondary synchronizer clamp; 40. Length adjustment drive assembly; 41. Fixture slider; 42. Reducer support plate; 43. Fixture drive motor. 43. Fixture drive gear; 44. Fixture drive rack; 45. Workpiece axial positioning assembly; 5. Fixed seat; 51. Inclined mounting part; 511. Positioning seat mounting hole; 512. Positioning seat; 52. Upper through hole; 521. Sealing ring; 522. Pressure rod seat; 53. Positioning rod; 54. Positioning tooth; 55. Spinning drive structure; 56. Pressure rod body; 57. Rotary pressing cylinder; 58. Mounting groove; 59. Elastic movable mounting structure; 6. Positioning rod movable hole; 61. Elastic movable mounting assembly; 62. Limiting part; 63. End cover; 64. Return spring; 65. Lower through hole; 66. End cover positioning hole; 67. Positioning seat locking structure; 7. Positioning seat locking hole; 71. Scale line; 72. Marking line; 73. Strip-shaped detection hole; 8. Sensor fixing seat; 81. Sensor fixing hole; 82. Position sensor; 83. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1-7As shown, a bidirectional end face cutting machine tool based on automotive steering rack includes a machine bed 1. The upper end of the machine bed 1 is provided with a mounting seat 11 having an inclined mounting surface 12. Machining seats 13 are respectively provided at both ends of the inclined mounting surface 12. A seat drive structure 2 is provided between the mounting seat 11 and the machining seats 13, which can drive the machining seats 13 to move along the length direction and the width direction of the mounting seat 11. A workpiece clamping assembly 3 is provided between the two machining seats 13. The workpiece clamping assembly 3 is divided into a main clamping assembly 31 and a secondary clamping assembly 32. The main clamping assembly 31 is fixedly connected to the mounting seat 11. The secondary clamping assembly 32 is movably connected to the mounting seat 11 through a length adjustment drive assembly 4 that can move the secondary clamping assembly 32 closer to or further away from the main clamping assembly 31. The machining seats 13 are provided with any one or more combinations of a thread assembly 14, a milling cutter assembly 15, a drilling assembly 16, and a length positioning assembly 20 at the end near the workpiece clamping assembly 3. Both machining seats 13 have thread assembly 14, milling cutter assembly 15 and drilling assembly 16. Driven by the seat drive structure 2, both ends of the rack can be machined, reducing changeover time and improving production efficiency. At the same time, the distance between the main clamping assembly 31 and the auxiliary clamping assembly 32 is controlled by the length adjustment drive assembly 4, so that it can be flexibly adjusted according to different rack specifications, which improves the efficiency of the bidirectional end face cutting machine tool.

[0032] Combination Figure 1 and Figure 3 As shown, the main clamp assembly 31 has a main clamp seat 33. The main clamp seat 33 has a mounting protrusion 34 on the side away from the mounting base 11, and a mounting notch 35 on one side of the mounting protrusion 34. Main synchronizing clamps 36 are respectively provided at both ends of the mounting protrusion 34. Clamping mounting grooves 17 corresponding to the two ends of the main clamp seat 33 are respectively provided on both sides of the inclined mounting surface 12. The auxiliary clamp assembly 32 has an auxiliary clamp seat 37, and auxiliary synchronizing clamps 38 corresponding to the main synchronizing clamps 36 are respectively provided at both ends of the auxiliary clamp seat 37 on the side away from the mounting base 11. The main synchronizing clamps 36 and auxiliary synchronizing clamps 38 are used to fix the two ends of the rack, ensuring the stability of the rack.

[0033] Combination Figure 2 and Figure 6As shown, the length adjustment drive assembly 4 includes several clamping sliders 41 disposed at both ends of the sub-clamp seat 37 near the mounting base 11. Several X-axis guide rails 18 are respectively provided on both sides of the inclined mounting surface 12. The clamping sliders 41 are connected to the X-axis guide rails 18. A reducer support plate 42 is provided at one end of the sub-clamp seat 37, and a clamping drive motor 43 is mounted on the reducer support plate 42. A clamping drive rack 45, connected to the clamping drive gear 44 of the clamping drive motor 43, is provided on the side of the mounting base 11 near the reducer support plate 42 and away from the inclined mounting surface 12. The mutual cooperation of the clamping drive motor 43 and the clamping drive rack 45 controls the movement of the sub-clamp seat 37, thereby adjusting the position of the sub-clamp seat 37 according to the length of the rack, improving practicality.

[0034] Combination Figures 3-5 As shown, the installation notch 35 has workpiece axial positioning components 5 at both ends, corresponding to the main synchronous clamp 36. The workpiece axial positioning component 5 has a fixed seat 51. One end of the fixed seat 51 is connected to the main clamp seat 33. A positioning seat 52 and a pressure rod seat 53 are respectively provided on one side of the fixed seat 51. A positioning rod 54 with positioning teeth 55 is movably provided on the positioning seat 52 through an elastic movable mounting structure 6. A pressure rod body 57 that can swing circumferentially in the direction of the positioning rod 54 and can be pressed down in the direction of the positioning rod 54 is provided on the pressure rod seat 53 through a spinning drive structure 56. A steering rack 19 is provided between the main synchronous clamp 36 and the auxiliary synchronous clamp 38 at the same end, and the teeth of the steering rack 19 correspond to the positioning teeth 55. The pressure rod body 57 moves above the positioning rod 54 and downwards via the spinning drive structure 56, thereby pressing the positioning rod 54 and the pressure rod body 57 together to press the steering rack 19. Simultaneously, the positioning teeth 55 ensure that the steering rack does not move axially, improving machining stability. The fixed seat 51 is wedge-shaped and has an inclined mounting portion 511 on one side. The positioning seat 52 and the pressure rod seat 53 are respectively mounted on the inclined mounting portion 511. The inclined mounting portion 511 has a positioning seat mounting hole 512, and one end of the positioning seat 52 can rotate circumferentially. A positioning seat locking structure 7 is provided between the positioning seat 52 and the fixed seat 51, and is rotatably set within the positioning seat mounting hole 512. The positioning seat locking structure 7 includes several positioning seat locking holes 71 radially arranged on one side of the fixed seat 51 and communicating with the positioning seat mounting hole 512. Several positioning seat locking bolts are provided in the positioning seat locking holes 71, which abut against the outer side of the positioning seat 52. The inclined mounting part 511 is provided with scale lines 72 located on the outer circumference of the positioning seat mounting hole 512, and the outer side of the positioning seat 52 is provided with marking lines 73 corresponding to the scale lines 72. The reasonable design structure makes the processing process smoother, reduces the actual adjustment and trimming during the processing, thereby improving production efficiency.

[0035] Specifically, the flexible movable mounting structure 6 includes a positioning rod movable hole 61 disposed in the fixed seat 51 and coaxially connected with the positioning seat mounting hole 512. The positioning rod 54 is movably inserted into the positioning seat 52 through the flexible movable mounting assembly 62. The positioning seat 52 is cylindrical, with the upper end closed and the lower end open. The upper end of the positioning rod 54 extends out of the upper end of the positioning seat 52, and the lower end of the positioning rod 54 extends out of the lower end of the positioning seat 52 and extends into the positioning rod movable hole 61. The flexible movable mounting assembly 62 includes a limiting part 63 disposed on the outer side of the positioning rod 54 and located in the positioning seat 52. The lower end of the positioning seat 52 is closed by an end cover 64, and the lower end of the positioning rod 54 passes through the end cover 64. A return spring 65 is sleeved on the positioning rod 54. One end of the return spring 65 acts on the limiting part 63, and the other end acts on the end cover 64. When the positioning rod 54 moves downward, the return spring 65 begins to tighten. Simultaneously, the return spring 65 also applies an upward reaction force to the positioning rod 54, ensuring its stability. The diameter of the mounting hole 512 in the positioning seat is equal to the diameter of the positioning seat 52. The upper end of the positioning seat 52 has an upper through-hole 521 through which the upper end of the positioning rod 54 passes. A sealing ring 522, abutting against the outer side of the positioning rod 54, is located circumferentially inside the upper through-hole 521. The end cap 64 has a lower through-hole 66 through which the lower end of the positioning rod 54 passes. The end cap 64 is inserted into the lower opening of the positioning seat 52, and the lower outer side of the positioning seat 52 has a radially arranged end cap positioning hole 67. An end cap positioning bolt, abutting against the outer side of the end cap 64, is provided in the end cap positioning hole 67. The end cap 64 is fixed by the end cap positioning bolt, ensuring a secure connection between the end cap 64 and the positioning seat 52 and guaranteeing the normal operation of the return spring 65.

[0036] The fixed base 51 has a strip-shaped detection hole 8 on one side that communicates with the movable hole 61 of the positioning rod. A sensor fixing base 81 is mounted on the other side of the fixed base 51 via a positioning locking bolt. The sensor fixing base 81 has a sensor fixing hole 82 corresponding to the strip-shaped detection hole 8. A position sensor 83, inserted into the strip-shaped detection hole 8 and corresponding to the outer side of the positioning rod 54, is installed in the sensor fixing hole 82. The pressure rod base 53 is fixed to the inclined mounting part 511 by several mounting bolts. The spinning drive structure 56 is a rotating pressing cylinder 58 mounted on the pressure rod base 53. One end of the pressure rod body 57 is fixed to the cylinder rod of the rotating pressing cylinder 58. The upper end of the positioning rod 54 has a dovetail-shaped mounting groove 59. The lower end of the positioning tooth 55 is located in the mounting groove 59 and is fixedly connected to the mounting groove 59 by fixing bolts. The positioning tooth 55 is installed in the mounting groove 59 and fixed by fixing bolts. This structural design facilitates the disassembly and replacement of the positioning tooth 55, improving practicality.

[0037] Combination Figure 1 and Figure 7As shown, the seat drive structure 2 includes a seat drive groove 21 axially arranged in the mounting base 11. X-axis lead screw drive assemblies 22 are respectively provided at both ends of the seat drive groove 21. X-axis slides 23 connected to the X-axis lead screw drive assemblies 22 are respectively provided at both ends of the mounting base 11. Several X-axis sliders 24 connected to the X-axis guide rails 18 are respectively provided at both ends of the X-axis slides 23 near the mounting base 11. Y-axis slides 25 are provided on the side of the X-axis slides 23 away from the mounting base 11. Y-axis lead screw drive assemblies 26 connected to the Y-axis slides 25 are provided inside the X-axis slides 23. Y-axis guide rails 27 are respectively provided on both sides of the Y-axis lead screw drive assemblies 26. Several Y-axis sliders 28 connected to the Y-axis guide rails 27 are respectively provided on the side of the Y-axis slides 25 near the X-axis slides 23. The machining seat 13 is located on the side of the Y-axis slides 25 away from the X-axis slides 23.

[0038] A method for bidirectional end face cutting of automotive steering rack, comprising the following steps:

[0039] S1. The length positioning component 20 measures the length of the rack blank, and the machining base 13 rough-machines the end faces of both ends of the rack blank. After the end faces are machined, the center holes of both ends of the rack blank are machined.

[0040] S2. Remove the rack blank and send it to a gear machining machine to perform gear machining on the rack blank, thereby obtaining a steering gear rack 19 with teeth.

[0041] S3. After the gear teeth are machined, the steering rack 19 is placed on the main fixture assembly 31 and the auxiliary fixture assembly 32. The workpiece axial positioning assembly 5 axially positions the steering rack 19. Through the center hole machined by rough machining, the thread assembly 14, the milling cutter assembly 15 and the drilling assembly 16 on the machining seat 13 perform finishing milling, drilling and tapping on both ends of the steering rack 19.

[0042] In step S1, the length positioning component 20 measures the length of the rack blank and calculates the machining data required for roughing and finishing based on the measured length, thereby ensuring the machining accuracy of the steering gear rack 19.

[0043] Specifically, after the rack blank is machined with teeth in steps S2-S3, it is directly installed on the main fixture assembly 31 and the auxiliary fixture assembly 32 through the rough-machined center hole. The workpiece axial positioning assembly 5 axially positions the steering rack 19, and then the machining seat 13 finishes both ends of the steering rack 19.

[0044] The principle of this embodiment is as follows:

[0045] The length of the steering rack 19 is measured by the length positioning component 20, and the auxiliary clamp seat 37 is adjusted by the length adjustment drive component 4. Then, the steering rack 19 is placed between the main synchronizing clamp 36 and the auxiliary synchronizing clamp 38 at the same end of the main clamp seat 33 and the auxiliary clamp seat 37. The teeth of the steering rack 19 are in contact with the positioning teeth 55 of the positioning rod 54. The rotating pressing cylinder 58 controls the pressing rod body 57 to rotate and press down on the steering rack 19, so that the steering rack 19 is fixed to the fixed seat 51. Then, the main synchronizing clamp 36 and the auxiliary synchronizing clamp 38 clamp the steering rack 19. Then, the machining seat 13 processes both ends of the steering rack 19 under the control of the seat drive structure 2.

[0046] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0047] Although this article extensively uses machine tool bed 1, mounting base 11, inclined mounting surface 12, machining base 13, thread assembly 14, milling cutter assembly 15, drilling assembly 16, fixture mounting slot 17, X-axis guide rail 18, steering gear rack 19, length positioning assembly 20, base drive structure 2, base drive slot 21, X-axis lead screw drive assembly 22, X-axis slide 23, X-axis slider 24, Y-axis slide 25, Y-axis lead screw drive assembly 26, Y-axis guide rail 27, Y-axis slider 28, workpiece fixture assembly 3, main fixture assembly 31, secondary fixture assembly 32, main fixture seat 33, mounting protrusion 34, mounting notch 35, main synchronizing clamp 36, secondary fixture seat 37, secondary synchronizing clamp 38, length adjustment drive assembly 4, fixture slider 41, reducer support plate 42, fixture drive motor 43, fixture The terms used include drive gear 44, clamp drive rack 45, workpiece axial positioning assembly 5, fixed seat 51, inclined mounting part 511, positioning seat mounting hole 512, positioning seat 52, upper through hole 521, sealing ring 522, pressure rod seat 53, positioning rod 54, positioning tooth 55, spinning drive structure 56, pressure rod body 57, rotary pressing cylinder 58, mounting groove 59, elastic movable mounting structure 6, positioning rod movable hole 61, elastic movable mounting assembly 62, limiting part 63, end cover 64, return spring 65, lower through hole 66, end cover positioning hole 67, positioning seat locking structure 7, positioning seat locking hole 71, scale line 72, marking line 73, strip-shaped detection hole 8, sensor fixing seat 81, sensor fixing hole 82, position sensor 83, etc., but the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A machine tool for bidirectional end face cutting of automotive steering rack, comprising a machine bed (1), wherein the upper end of the machine bed (1) is provided with a mounting seat (11) having an inclined mounting surface (12), and both ends of the inclined mounting surface (12) are respectively provided with machining seats (13), and a seat driving structure (2) is provided between the mounting seat (11) and the machining seats (13) to drive the machining seats (13) to move along the length direction of the mounting seat (11) and along the width direction of the mounting seat (11), characterized in that, A workpiece clamping assembly (3) is provided between two machining seats (13). The workpiece clamping assembly (3) is divided into a main clamping assembly (31) and a secondary clamping assembly (32). The main clamping assembly (31) is fixedly connected to the mounting base (11). The secondary clamping assembly (32) is movably connected to the mounting base (11) through a length adjustment drive assembly (4) that allows the secondary clamping assembly (32) to move closer to or further away from the main clamping assembly (31). The machining seat (13) is provided with any one or more combinations of a thread assembly (14), a milling cutter assembly (15), a drilling assembly (16), and a length positioning assembly (20) at one end near the workpiece clamping assembly (3). The main clamp assembly (31) has a main clamp seat (33), and the main clamp seat (33) has a mounting protrusion (34) on the side away from the mounting base (11). The mounting protrusion (34) has a mounting notch (35) on one side. The mounting protrusion (34) has a main synchronizing clamp (36) at both ends. The inclined mounting surface (12) has clamp mounting grooves (17) on both sides corresponding to the two ends of the main clamp seat (33). The auxiliary clamp assembly (32) has an auxiliary clamp seat (37), and the auxiliary clamp seat (37) has auxiliary synchronizing clamps (38) at both ends on the side away from the mounting base (11) corresponding to the main synchronizing clamps (36). The mounting notch (35) has workpiece axial positioning components (5) corresponding to the main synchronous clamp (36) at both ends. The workpiece axial positioning components (5) have a fixed seat (51). One end of the fixed seat (51) is connected to the main clamp seat (33). The fixed seat (51) has a positioning seat (52) and a pressure rod seat (53) on one side. The positioning seat (52) is movably provided with a positioning rod (54) with positioning teeth (55) through an elastic movable mounting structure (6). The pressure rod seat (53) is provided with a pressure rod body (57) that can swing circumferentially toward the positioning rod (54) and can press down toward the positioning rod (54) through a spinning drive structure (56). A steering rack (19) is provided between the main synchronous clamp (36) and the auxiliary synchronous clamp (38) at the same end. The teeth of the steering rack (19) correspond to the positioning teeth (55). The fixed seat (51) is wedge-shaped and the fixed seat (51) is one The inclined mounting part (511) is inclined on one side. The positioning seat (52) and the pressure rod seat (53) are respectively disposed on the inclined mounting part (511). The inclined mounting part (511) is provided with a positioning seat mounting hole (512). One end of the positioning seat (52) is rotatably disposed in the positioning seat mounting hole (512). A positioning seat locking structure (7) is provided between the positioning seat (52) and the fixed seat (51). The positioning seat locking structure (7) includes a plurality of positioning seat locking holes (71) radially disposed on one side of the fixed seat (51) and connected to the positioning seat mounting hole (512). A plurality of positioning seat locking bolts abutting against the outer side of the positioning seat (52) are provided in the positioning seat locking holes (71). The inclined mounting part (511) is provided with a scale line (72) located on the outer side of the positioning seat mounting hole (512). A marking line (73) corresponding to the scale line (72) is provided on the outer side of the positioning seat (52).

2. The machine tool for bidirectional end face cutting of automotive steering rack according to claim 1, characterized in that, The length adjustment drive assembly (4) includes several clamp sliders (41) disposed at both ends of the sub-clamp seat (37) near the mounting base (11). Several X-axis guide rails (18) are respectively provided on both sides of the inclined mounting surface (12). The clamp sliders (41) are connected to the X-axis guide rails (18). A reducer support plate (42) is provided at one end of the sub-clamp seat (37). A clamp drive motor (43) is provided on the reducer support plate (42). A clamp drive rack (45) connected to the clamp drive gear (44) of the clamp drive motor (43) is provided on the side of the mounting base (11) near the reducer support plate (42) and away from the inclined mounting surface (12).

3. The machine tool for bidirectional end face cutting of automotive steering rack according to claim 1, characterized in that, The elastic movable mounting structure (6) includes a positioning rod movable hole (61) disposed in the fixed seat (51) and coaxially connected with the positioning seat mounting hole (512). The positioning rod (54) is movably inserted into the positioning seat (52) through the elastic movable mounting assembly (62). The positioning seat (52) is cylindrical, with the upper end closed and the lower end open. The upper end of the positioning rod (54) extends out of the upper end of the positioning seat (52), and the lower end of the positioning rod (54) extends out of the lower end of the positioning seat (52) and into the positioning rod movable hole (61). The elastic movable mounting assembly (62) includes a limiting part (63) disposed on the circumferential outer side of the positioning rod (54) and located in the positioning seat (52). The lower end of the positioning seat (52) is closed by an end cap (64), and the lower end of the positioning rod (54) passes through the end cap (64). 54) A return spring (65) is fitted on the upper part. One end of the return spring (65) acts on the limiting part (63) and the other end acts on the end cover (64). The size of the hole (512) of the positioning seat is equal to the size of the diameter of the positioning seat (52). The upper end of the positioning seat (52) has an upper through hole (521) for the upper end of the positioning rod (54) to pass through. The upper through hole (521) has a sealing ring (522) on the inner side of the circumference that abuts against the outer side of the positioning rod (54). The end cover (64) has a lower through hole (66) for the lower end of the positioning rod (54) to pass through. The end cover (64) is inserted into the lower opening of the positioning seat (52) and the lower outer side of the positioning seat (52) has a radially arranged end cover positioning hole (67). The end cover positioning hole (67) is provided with an end cover positioning bolt that abuts against the outer side of the end cover (64).

4. A machine tool for bidirectional end face cutting of automotive steering rack according to claim 3, characterized in that, The fixed base (51) has a strip-shaped detection hole (8) on one side that communicates with the movable hole (61) of the positioning rod. The fixed base (51) has a sensor fixing seat (81) on one side through a positioning locking bolt. The sensor fixing seat (81) has a sensor fixing hole (82) corresponding to the strip-shaped detection hole (8). A position sensor (83) is installed in the sensor fixing hole (82) and is inserted into the strip-shaped detection hole (8) and corresponds to the outside of the positioning rod (54). The pressure rod seat (53) The spin-pressing drive structure (56) is a rotary pressing cylinder (58) mounted on the pressing rod seat (53) and fixed to the inclined mounting part (511) by several mounting bolts. One end of the pressing rod body (57) is fixed on the cylinder rod of the rotary pressing cylinder (58). The upper end of the positioning rod (54) is provided with a dovetail-shaped mounting groove (59). The lower end of the positioning tooth (55) is set in the mounting groove (59). The positioning tooth (55) is fixedly connected to the mounting groove (59) by fixing bolts.

5. A machine tool for bidirectional end face cutting of automotive steering rack according to claim 2, characterized in that, The seat drive structure (2) includes a seat drive groove (21) axially disposed within the mounting base (11). X-axis lead screw drive assemblies (22) are respectively provided at both ends of the seat drive groove (21). X-axis slides (23) connected to the X-axis lead screw drive assemblies (22) are respectively provided at both ends of the mounting base (11). Several X-axis sliders (24) connected to the X-axis guide rails (18) are respectively provided at both ends of the X-axis slides (23) near the mounting base (11). The X-axis slides (23) are located away from... The mounting base (11) has a Y-axis slide (25) on one side. The X-axis slide (23) has a Y-axis lead screw drive assembly (26) connected to the Y-axis slide (25). The Y-axis lead screw drive assembly (26) has Y-axis guide rails (27) on both sides. The Y-axis slide (25) has several Y-axis sliders (28) connected to the Y-axis guide rails (27) on the side of the Y-axis slide (25) close to the X-axis slide (23). The machining seat (13) is located on the side of the Y-axis slide (25) away from the X-axis slide (23).

6. A method for bidirectional end-face cutting of an automotive steering rack using a bidirectional end-face cutting machine tool based on any one of claims 1-5, characterized in that, This method includes the following steps: S1. The length positioning component (20) measures the length of the rack blank, and the machining base (13) rough-machines the end faces of both ends of the rack blank. After the end faces are machined, the center holes of both ends of the rack blank are machined. S2. Remove the rack blank and send it to the gear machining machine tool to perform gear machining on the rack blank, thereby obtaining a steering gear rack with teeth (19). S3. After the gear teeth are machined, the steering rack (19) is placed on the main fixture assembly (31) and the auxiliary fixture assembly (32). The workpiece axial positioning assembly (5) positions the steering rack (19) axially. Through the center hole machined by rough machining, the thread assembly (14), milling cutter assembly (15) and drilling assembly (16) on the machining seat (13) perform finishing milling, drilling and tapping on both ends of the steering rack (19).

7. A method for bidirectional end face cutting of an automotive steering rack according to claim 6, characterized in that, In step S1, the length positioning component (20) measures the length of the rack blank and calculates the machining data required for roughing and finishing based on the measured length, thereby ensuring the machining accuracy of the steering rack (19).

8. The method for bidirectional end face cutting of a car steering rack according to claim 7, characterized in that, In steps S2-S3, after the rack blank is machined to produce teeth, it is directly installed on the main fixture assembly (31) and the auxiliary fixture assembly (32) through the rough-machined center hole. The workpiece axial positioning assembly (5) axially positions the steering rack (19), and then the machining seat (13) finishes the two ends of the steering rack (19).

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