Precise gear grinding tool for automobile steering rack

Abstract

The invention relates to the technical field of automobile steering, and discloses an automobile steering rack precise gear grinding tool which comprises a base and a controller, a pressing plate rotationally arranged on the inner wall of the base is arranged at the output end of a hydraulic cylinder, and a clamp block detachably installed on the upper side of the base is arranged on the outer wall, away from the pressing plate, of a workpiece in an attached mode. A first air cylinder and a front baffle which are fixed to the upper side of the base are arranged at the two ends of the workpiece in an attached mode respectively, an inclined face block attached to the tooth face of the workpiece is arranged on the outer wall of the adjusting ring, and a second air cylinder fixed to the upper side of the base is arranged on the outer wall, away from the inclined face block, of the workpiece in an attached mode. Through the rotatable adjusting ring, the position of the inclined plane block is adjusted, then positioning of a workpiece during machining of different tooth surface included angles can be adapted, through cooperation of the first air cylinder, the front baffle, the second air cylinder, the hydraulic cylinder, the pressing plate and the clamp block, fixing of the two ends of the workpiece is completed, and therefore the workpiece clamping precision and the machining efficiency of the tool are improved.

Description

Technical Field

[0001] This invention relates to the field of automotive steering technology, specifically to a precision gear grinding fixture for automotive steering racks. Background Technology

[0002] The rack is a core component in automotive steering systems, especially the machining of double-ended racks. Due to the different helix angles, diameters, meshing center distances, and phase angles of the two tooth surfaces of different rack models, special fixtures are required for production. Existing fixtures require manual removal after machining one end of the rack, and the other end needs to be clamped and machined. However, since the axis projections of the teeth at both ends have specific angles, repeated adjustments are required when machining the other end, which is time-consuming and labor-intensive.

[0003] A search revealed Chinese Patent Publication No. CN208680700U, which discloses a positioning fixture suitable for machining double-tooth racks, belonging to the technical field of automotive steering component fixture design. It consists of a grinding fixture box and a positioning support. The grinding fixture box is fixedly mounted on one side of the worktable, and the positioning support is mounted on the other side of the worktable via a locking nut and a positioning pin. This positioning fixture for machining double-tooth racks is easy to operate, has high machining accuracy, and solves the problems of large positioning errors and poor machining accuracy existing in traditional rack machining fixtures, thus meeting the needs of automotive steering component production and processing.

[0004] The above-mentioned device can fix the processed teeth at one end by means of the cooperation of the pressure plate and the fastening bolt, thereby efficiently positioning the position of the other end and realizing the processing of teeth at both ends; however, the following problems still exist: First, it requires manual turning and tightening, which is inefficient; Second, the above-mentioned included angle cannot fix teeth that are misaligned at both ends. Summary of the Invention

[0005] To address the shortcomings of existing technologies and solve the aforementioned technical problems, this invention provides a precision gear grinding fixture for automotive steering racks.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a precision gear grinding fixture for automotive steering racks, comprising a base and a controller. Multiple hydraulic cylinders are fixed to the inner wall of the base. A pressure plate rotating on the inner wall of the base is provided at the output end of each hydraulic cylinder. A workpiece is attached to the upper outer wall of the pressure plate. A clamping block detachably mounted on the upper side of the base is attached to the outer wall of the workpiece away from the pressure plate. A cylinder one and a front baffle, respectively fixed to the upper side of the base, are attached to both ends of the workpiece. A bracket disposed on the outer wall of the base is attached to the middle of the workpiece. An adjusting ring rotating on the outer wall of the front baffle is sleeved around the workpiece. An inclined block that engages with the tooth surface of the workpiece is provided on the outer wall of the adjusting ring. A support seat fixed to the upper side of the base is attached to the outer wall of the inclined block. A cylinder two, fixed to the upper side of the base, is attached to the outer wall of the workpiece away from the inclined block.

[0007] Preferably, a connecting seat is fixed to the outer wall of the adjusting ring, the outer walls of the inclined block slide through the inner wall of the connecting seat, an electric push rod II is fixed to the outer wall of the connecting seat, the side of the inclined block away from the workpiece is detachably installed at the output end of the electric push rod II, one side of the connecting seat is attached to the outer wall of the support seat, and the other side of the connecting seat is set as an inclined surface.

[0008] Preferably, the inner wall of the inclined block is provided with a locking component, the locking component includes an electromagnet fixed to the inner wall of the inclined block, a locking rod sliding on the inner wall of the inclined block, and a plurality of locking holes that cooperate with the sliding of the locking rod on the inner wall of the connecting seat.

[0009] Preferably, the outer wall of the front baffle is rotatably connected to a rotating rod that fits against one end of the workpiece. One end of the rotating rod passes through the adjusting ring on the side away from the front baffle, and the output end of the cylinder is fixedly provided with a bearing that fits against the other end of the workpiece.

[0010] Preferably, a reversing assembly is provided on the lower side of the base, the reversing assembly including an electric push rod fixed on the lower side of the base, the output end of the electric push rod being located on the lower side of the bracket.

[0011] Preferably, a plurality of bearings are rolled together on the outer wall of the middle part of the workpiece, and the outer walls of the plurality of bearings are rotatably connected to the outer wall of the bracket.

[0012] Preferably, a motor is fixed to the inner wall of the bracket, a gear is fixed to the output end of the electric push rod, a gear is fixed to the output end of the motor that meshes with the tooth end of the gear, a motor is fixed to the outer wall of the front baffle, and the output end of the motor is fixed to one end of the rotating rod.

[0013] Preferably, an electromagnet is attached to the lower middle part of the workpiece, the outer wall of the electromagnet slides on the inner wall of the bracket, and the inner bottom wall of the electromagnet is attached to the inner top wall of the bracket.

[0014] Preferably, a fixed seat for supporting cylinder two is fixed on the upper side of the base, and a bracket is fixedly provided at the output end of cylinder two. A V-shaped groove is opened on the side of the bracket near the workpiece. Multiple pressing rollers are rolled against the outer wall of the workpiece away from the inclined block. The multiple pressing rollers are evenly distributed and rotate on the inner walls of both sides of the V-shaped groove of the bracket.

[0015] Preferably, there are two rotating drive handles, namely a first drive handle and a second drive handle, between the two side walls of the pressure plate. The lower side of the second drive handle is fixed to the inner wall of the base, and the output end of the hydraulic cylinder is fixedly disposed on the outer wall of the first drive handle.

[0016] Working principle: When using it for the first time, rotate the adjusting ring to adjust the inclination angle of the inclined block to match the different machining angles of the tooth surfaces at both ends of the workpiece; after calibration with measuring tools, tighten the adjusting ring and the front baffle with bolts, and then place the support base against the inclined block and fix it on the base to complete the tooling angle adjustment and adaptation. During loading, the front end of the workpiece is pressed against the front baffle so that the machined tooth surface is in contact with the inclined block; the workpiece is axially positioned by cylinder one, and cylinder two works with the inclined block to clamp the front end of the workpiece. The bracket supports the middle of the workpiece so that the rear end of the workpiece faces upward. Subsequent batch loading only requires contact with the tooth surface, without the need for repeated measurement and adjustment. Finally, the controller drives the hydraulic cylinder to move the pressure plate, which, together with the clamping block, reinforces the front end of the workpiece, allowing for tooth surface machining. This achieves rapid positioning, clamping, and efficient machining of the workpiece.

[0017] This invention provides a precision grinding fixture for automotive steering racks. It offers the following advantages: 1. This invention uses a rotatable adjusting ring to adjust the position of the inclined block, allowing it to adapt to different tooth surface angles during workpiece machining. Axial positioning of the workpiece is achieved through the cooperation of cylinder one and the front baffle. The front end of the workpiece is fixed by the drive of the output end of cylinder two. The pressure plate is rotated by the drive of the output end of the hydraulic cylinder, and the rear end of the workpiece is fixed through the cooperation of the clamping blocks. This improves the workpiece clamping accuracy and machining efficiency of the fixture.

[0018] 2. This invention drives the inclined block to move horizontally by driving the output end of the electric push rod, avoiding interference with the machining of the workpiece's smooth rod, thereby helping to improve the applicability of the tooling.

[0019] 3. The present invention drives the bracket to move upward by the output end of the electric push rod, thereby making the workpiece coaxial with the bearing and the rotating rod. The workpiece is driven by the output end of the motor until its tooth surface matches the inclined surface of the inclined block, thereby improving the efficiency of the tooling for changing material upward.

[0020] 4. This invention drives the workpiece to a height that does not interfere with the tooling by driving the output end of the electric push rod. Then, it drives the workpiece to rotate 180 degrees by driving the output end of the motor, thus completing the reversal of the workpiece during the processing of both ends. This realizes the function of automatic reversal of the tooling when processing the workpiece. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a partial cross-sectional schematic diagram of the base of the present invention; Figure 4 This is a schematic diagram of the commutation component structure of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the bracket of the present invention; Figure 6 This is a three-dimensional structural diagram of the workpiece front end of the present invention; Figure 7 This is a schematic diagram of the exploded structure at the adjusting ring of the present invention; Figure 8 for Figure 7 Enlarged view of point B in the middle; Figure 9 This is a three-dimensional schematic diagram of two parts of the cylinder of the present invention.

[0022] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0023] The components are as follows: 1. Base; 2. Reversing assembly; 200. Electric push rod one; 201. Electromagnet one; 202. Bearing one; 203. Motor one; 204. Gear one; 205. Gear two; 3. Pressure plate; 4. Workpiece; 5. Clamping block; 6. Cylinder one; 7. Bracket; 8. Cylinder two; 9. Front baffle; 10. Adjusting ring; 11. Connecting seat; 12. Bearing two; 13. Hydraulic cylinder; 14. Drive handle one; 15. Drive handle two; 16. Inclined block; 17. Electric push rod two; 18. Support seat; 19. Motor two; 20. Fixed seat; 21. Pressing roller; 22. Bracket; 23. Locking assembly; 230. Locking hole; 231. Locking rod; 232. Electromagnet two; 24. Rotating rod. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1, please refer to the appendix. Figure 1 Appendix Figure 3 Appendix Figure 6 and attached Figure 9 This invention provides a precision grinding fixture for automotive steering racks. A groove is provided on the side of the clamp block 5 where it contacts the workpiece 4, facilitating the fixing of the workpiece 4. An inclined surface is provided on the side of the pressure plate 3 where it contacts the workpiece 4, facilitating the fixing of the workpiece 4; this is a conventional design. The controller can use a combination of a PLC programmable controller and a touch screen. Pressure sensors are provided at the direct or indirect contact points between the pressure plate 3, cylinder 6, cylinder 8, bracket 7, and workpiece 4, and all of the above structures are electrically connected to the controller to control the automatic coordination of the fixture's various structures. The hydraulic cylinder 13 also includes various structural accessories for its own drive. All of the above are existing technologies and will not be described in detail further. A precision grinding fixture for automotive steering racks includes a base 1 and a controller. Multiple hydraulic cylinders 13 are fixed to the inner wall of the base 1. A pressure plate 3, rotating on the inner wall of the base 1, is installed at the output end of each hydraulic cylinder 13. A workpiece 4 is attached to the upper outer wall of the pressure plate 3. A clamping block 5, detachably mounted on the upper side of the base 1, is attached to the outer wall of the workpiece 4 away from the pressure plate 3. A cylinder 6 and a front baffle 9, fixed to the upper side of the base 1, are respectively attached to both ends of the workpiece 4. A bracket 7, located on the outer wall of the base 1, is attached to the middle of the workpiece 4. An adjusting ring 10, rotating on the outer wall of the front baffle 9, is sleeved around the workpiece 4. An inclined block 16, which engages with the tooth surface of the workpiece 4, is installed on the outer wall of the inclined block 16. A support seat 18, fixed to the upper side of the base 1, is attached to the outer wall of the workpiece 4 away from the inclined block 16. A cylinder 8, fixed to the upper side of the base 1, is attached to the outer wall of the workpiece 4 away from the inclined block 16.

[0026] Specifically, upon initial use, the angle of the inclined block 16 is adjusted by rotating the adjusting ring 10, so that the angle between its inclined surface and the horizontal plane is adjusted to accommodate the machining of different angles of the tooth surfaces at both ends of different types of workpieces 4. During this process, the angle can be measured with a measuring tool, and the adjusting ring 10 and the front baffle 9 can be fixed with bolts. Then, the outer wall of the support seat 18 is attached to the outer wall of the inclined block 16 to provide support. The support seat 18 is fixed to the base 1 with bolts to complete the tooling adjustment, thereby realizing the function of adjusting the different angles of the tooth surfaces at both ends of the workpiece 4 and efficient clamping. Next, the front end of workpiece 4 is attached to the front baffle 9, and the machined tooth surface of its front end is attached to the inclined surface of the inclined block 16. The controller controls the output end of cylinder 6 to drive the workpiece 4 axially. The output end of cylinder 8 is driven to cooperate with the inclined block 16 to clamp and fix the front end of workpiece 4. The middle part of workpiece 4 is supported by bracket 7. Since the front tooth surface of workpiece 4 is fixed at this time, the rear tooth surface to be processed is facing upward. Therefore, the subsequent processing of each workpiece 4 only requires the front tooth surface of workpiece 4 to be attached to the inclined surface of the inclined block 16, without the need for long-term measurement and adjustment of the position of workpiece 4 for each loading. Then, the hydraulic cylinder 13 is controlled by the controller to drive the pressure plate 3 to rotate, and the front end of the workpiece 4 is fixed by the cooperation of the clamp block 5, so that the tooth surface of the front end can be machined; thus, the tooling achieves efficient positioning and clamping of the workpiece 4.

[0027] Example 2, please refer to the appendix. Figure 6 and attached Figure 7 Based on the above embodiments, the inclined block 16 enables the pre-processed front end of the workpiece 4 to be clamped at a preset angle, thereby enabling precise positioning and clamping of the rear end of the workpiece 4 to be processed. However, when processing the front end of the workpiece 4, it needs to be disassembled, which is cumbersome. This embodiment proposes the following solution to solve the above problems: the outer wall of the adjusting ring 10 is fixed with a connecting seat 11, the outer walls of the inclined block 16 slide through the inner wall of the connecting seat 11, the outer wall of the connecting seat 11 is fixed with an electric push rod 17, the side of the inclined block 16 away from the workpiece 4 is detachably installed at the output end of the electric push rod 17, one side of the connecting seat 11 is attached to the outer wall of the support seat 18, and the other side of the connecting seat 11 is inclined.

[0028] Specifically, when workpiece 4 is a smooth rod, the output end of electric push rod 17 is driven by the controller to drive the inclined block 16 to slide away from workpiece 4, avoiding interference during loading. After loading, the rear end of workpiece 4 is supported by clamp block 5 and the middle part is supported by bracket 7. Therefore, the output end of cylinder 6 can drive workpiece 4 to axially align it. After alignment, the rear end of workpiece 4 is clamped and fixed by the cooperation of clamp block 5 and pressure plate 3. The front end of workpiece 4 can be fixed by driving inclined block 16 to fit against one side of the outer wall of workpiece 4 through electric push rod 17, and the output end of cylinder 8 fits against the other side of workpiece 4. The front end can also be left unfixed. This helps to improve the efficiency of the tooling positioning and clamping when processing both ends of workpiece 4.

[0029] Please see the appendix Figure 7 and attached Figure 8The inner wall of the inclined block 16 is provided with a locking component 23. The locking component 23 includes an electromagnet 232 fixed to the inner wall of the inclined block 16. A locking rod 231 slides on the inner wall of the inclined block 16. The inner wall of the connecting seat 11 is provided with a plurality of locking holes 230 that cooperate with the sliding of the locking rod 231.

[0030] Specifically, the locking rod 231 includes a sliding rod and a magnetic block fixed at one end of the sliding rod. When the rear end of the workpiece 4 is being processed, the output end of the electric push rod 17 drives the inclined block 16 to move to a position that fits against the tooth surface of the workpiece 4. Then, the controller controls the electromagnet 232 to be energized to generate a magnetic force that repels the locking rod 231, pushing the locking rod 231 into the lock hole 230 to limit and lock the inclined block 16. When the inclined block 16 is not needed for positioning and clamping, the electromagnet 232 attracts the locking rod 231 through the magnetic force that attracts it to slide out of the lock hole 230 and retract into the inclined block 16, releasing the lock on the inclined block 16. Then, the output end of the electric push rod 17 drives it to move, thereby helping to improve the stability of the inclined block 16 when it participates in positioning.

[0031] In this embodiment, the detachable design of the inclined block 16 allows for the replacement of the inclined block 16 for workpieces 4 with different diameters and tooth surface depth requirements, thereby improving the applicability of the tooling.

[0032] Please see the appendix Figure 1 Appendix Figure 2 Appendix Figure 6 and attached Figure 7 The outer wall of the front baffle 9 is rotatably connected to a rotating rod 24 that is in contact with one end of the workpiece 4. One end of the rotating rod 24 passes through the adjusting ring 10 on the side away from the front baffle 9. The output end of the cylinder 6 is fixedly provided with a bearing 12 that is in contact with the other end of the workpiece 4.

[0033] Specifically, the output end of cylinder 16 is fixed to the inner ring of bearing 212, and the outer ring of bearing 212 is in contact with the rear end of workpiece 4, so that workpiece 4 can rotate relative to cylinder 16. In the above embodiment, after processing one end of the workpiece 4, workpiece 4 needs to be removed and turned. At this time, workpiece 4 cannot be immediately placed back to the work station, because if the tooth surface of workpiece 4 is not aligned with the inclined surface of inclined block 16 during the process of electric push rod 217 driving inclined block 16 to move, the interference between the tooling and workpiece 4 will cause wear of workpiece 4. Therefore, it is necessary to wait until inclined block 16 moves to the corresponding position before loading. During this process, one hand needs to hold workpiece 4 and the other hand needs to operate it, and the multiple work stations make the operation complicated. Unlike the above embodiments, the inclined surface of the inclined block 16 is coated with polyoxymethylene or cast nylon. In this embodiment, when machining the unmachined end of the workpiece 4, it is only necessary to place the workpiece 4 with the tooth surface roughly facing the inclined surface of the inclined block 16, and then operate the tooling to fix the workpiece 4 axially. At this time, the workpiece 4 is mainly supported by both ends. During the process of driving the inclined block 16 to the corresponding position by the electric push rod 17, the inclined surface of the inclined block 16 will squeeze the tooth surface of the workpiece 4. Through the cooperation of the rotating rod 24 and the bearing 12, the workpiece 4 is rotated until its tooth surface is completely in contact with the inclined surface of the inclined block 16, which helps to improve the efficiency and accuracy of the tooling positioning and clamping when machining the workpiece 4.

[0034] Example 3, please refer to the appendix. Figure 1 and attached Figure 4 Based on the above embodiments, the rotation of workpiece 4 is achieved by the coaxial cooperation of rotating rod 24, bearing 2 12 and workpiece 4, so as to improve the positioning and clamping efficiency of the tooling. However, when workpiece 4 of different diameters is replaced, workpiece 4, bearing 2 12 and rotating rod 24 are no longer coaxial, making the above feeding method unsuitable. This embodiment proposes the following solution to solve the above problem: a reversing assembly 2 is provided on the lower side of the base 1. The reversing assembly 2 includes an electric push rod 200 fixed on the lower side of the base 1. The output end of the electric push rod 200 is provided on the lower side of the bracket 7.

[0035] Specifically, the electric push rod 200 is a high-precision electric push rod. The upper side of the bracket 7 is provided with a V-shaped groove 2 to facilitate the centering support of the workpiece 4. The workpiece 4 with the largest processing diameter of the tooling is set to be coaxial with the bearing 12 and the rotating rod 24. When the diameter of the workpiece 4 decreases, the axis of the workpiece 4 is located slightly below the axis of the rotating rod 24 and the bearing 12. At this time, the diameter of the workpiece 4 is input into the controller. When changing the loading position, after the workpiece 4 is placed in the original position, the loading command is input through the touch screen. The controller controls the output end of the electric push rod 200 to drive the bracket 7 upward, thereby driving the workpiece 4 to move to be coaxial with the bearing 12 and the rotating rod 24. Then, the inclined block 16 is controlled to move to the corresponding position, so that the workpiece 4 rotates until its tooth surface and the inclined surface of the inclined block 16 are in contact, thereby further improving the positioning and clamping efficiency of the tooling.

[0036] Please see the appendix Figure 1 and attached Figure 4 Multiple bearings 202 are attached to and roll along the outer wall of the middle part of the workpiece 4, and the outer walls of the multiple bearings 202 are rotatably connected to the outer wall of the bracket 7.

[0037] Specifically, when the workpiece 4 rotates, there is a problem of wear caused by friction with the upper side of the bracket 7. Therefore, by setting multiple bearings 202, when the workpiece 4 rotates, the outer wall of the workpiece 4 and the multiple bearings 202 roll together, reducing the friction between the two and thus avoiding wear of the workpiece 4.

[0038] Example 4, please refer to the appendix. Figure 1 and attached Figure 3 and appendix Figure 5 - Appendix Figure 7 Based on the above embodiments, it is necessary to manually change the direction of both ends of the workpiece 4 and operate at multiple stations, which results in low efficiency. This embodiment proposes the following solution to solve the above problems: a motor 203 is fixed on the inner wall of the bracket 7, a gear 205 is fixed on the output end of the electric push rod 200, a gear 204 that meshes with the tooth end of the gear 205 is fixed on the output end of the motor 203, a motor 19 is fixed on the outer wall of the front baffle 9, and the output end of the motor 19 is fixedly set at one end of the rotating rod 24.

[0039] Specifically, both motor 203 and motor 19 are high-precision servo motors. When the workpiece 4 needs to be reversed, the controller drives the output ends of cylinder 6, cylinder 8 and hydraulic cylinder 13 to release the fixation of the workpiece 4. Then, the output end of the outermost electric push rod 200 of the controller drives the workpiece 4 to move up to a certain height. Then, the output end of motor 203 drives gear 204 to rotate. Through the cooperation of gear 205, the bracket 7 is rotated 180 degrees, thereby completing the reversal of the two ends of the workpiece 4. After the reversal is completed, the output end of electric push rod 200 drives the workpiece 4 to return to the original horizontal height. Then, the output end of cylinder 6 drives the workpiece 4 to be axially aligned and fixed. Then, the output end of motor 19 drives the rotating rod 24 to rotate, thereby driving the workpiece 4 to rotate by a preset angle so that its tooth surface faces the inclined surface of the inclined block 16. During this process, the controller also controls the electric push rod 17 to drive the inclined block 16 to move to a predetermined position so that its inclined surface matches the tooth surface of the workpiece 4. Then, the above steps are repeated, and the controller controls the workpiece 4 at another station to change direction, and the workpiece 4 on the entire fixture changes direction in sequence, thereby realizing the automatic reversing, positioning and fixing functions of the fixture on both ends of the workpiece 4.

[0040] Please see the appendix Figure 1 Appendix Figure 4 and attached Figure 5 An electromagnet 201 is attached to the lower middle part of the workpiece 4. The outer wall of the electromagnet 201 slides on the inner wall of the bracket 7, and the inner bottom wall of the electromagnet 201 is attached to the inner top wall of the bracket 7.

[0041] Specifically, when reversing the workpiece 4, environmental factors such as vibration can easily cause the workpiece 4 to shift horizontally, resulting in interference with the rotating rod 24 after the reversal is completed, preventing it from falling smoothly. Therefore, when driving the workpiece 4 to move upward for reversal, the controller first controls the electromagnet 201 to be energized, generating magnetic force. The attraction between the electromagnet and the workpiece 4 causes the electromagnet 201 to slide upward in the bracket 7. Its outer wall adheres to and is fixed to the inner wall of the bracket 7. After the workpiece 4 is attracted, the horizontal position of the workpiece 4 is limited. When the workpiece 4 rotates, the controller de-energizes the electromagnet 201, thereby helping to improve the efficiency of the tooling in reversing the workpiece 4.

[0042] Please see the appendix Figure 1 Appendix Figure 6 and attached Figure 8 A fixed seat 20 for supporting cylinder 2 8 is fixed on the upper side of the base 1. A bracket 22 is fixedly installed at the output end of cylinder 2 8. A V-shaped groove is opened on the side of the bracket 22 near the workpiece 4. Multiple pressing rollers 21 are rolled against the outer wall of the workpiece 4 away from the inclined block 16. The multiple pressing rollers 21 are evenly distributed and rotate on the inner walls of both sides of the V-shaped groove of the bracket 22.

[0043] Specifically, the base 1 provides support for the fixed seat 20, which in turn provides support for the cylinder 8. Driven by the output end of the cylinder 8, the bracket 22 moves closer to the outer wall of the workpiece 4 until the pressing rollers 21 on both sides of the inner wall of the V-groove are in contact with the outer wall of the workpiece 4. The front end of the workpiece 4 is fixed by the cooperation of the inclined block 16, which helps to improve the stability of the workpiece 4 during processing.

[0044] Please see the appendix Figure 3 Between the two side walls of the pressure plate 3, there are two rotating drive handles 14 and 15. The lower side of the drive handle 15 is fixed to the inner wall of the base 1, and the output end of the hydraulic cylinder 13 is fixed to the outer wall of the drive handle 14.

[0045] Specifically, both drive handle 14 and drive handle 2 15 are rotatably connected to pressure plate 3 via a rotating shaft. Driven by the output end of hydraulic cylinder 13, drive handle 14 moves horizontally. Through the rotatable connection between drive handle 14 and pressure plate 3, pressure plate 3 rotates around drive handle 2 15 and its rotating shaft, thereby realizing the function of clamping and fixing the rear end of workpiece 4.

[0046] Workflow: During use, the controller controls the inclined block 16 to move away from the workpiece 4, so that one end of the workpiece 4's smooth rod is attached to the outer wall of the rotating rod 24, and the other end is facing the output end of the bearing 12. Driven by the output end of the cylinder 6, the workpiece 4 is axially aligned and fixed. Then, the rear end of the workpiece 4 is clamped by the cooperation of the pressure plate 3 and the clamp block 5, and the tooth surface of the other end of the workpiece 4 is machined. After processing, the clamping and fixing of workpiece 4 is released by the controller. Then, the electric push rod 200 drives the bracket 7 to move up to a height that does not interfere with the tooling. Driven by the output of motor 203, workpiece 4 is rotated 180 degrees to complete the reversal. Then, driven by the electric push rod 200 again, workpiece 4 is reset to its original horizontal position. Then, driven by the output of cylinder 6, workpiece 4 is axially fixed. Driven by the output of motor 19, workpiece 4 is rotated by a preset angle, and the inclined block 16 is moved to a predetermined position, with its inclined surface fitting against the tooth surface of workpiece 4. Then, driven by cylinder 8, the other end of workpiece 4 is fixed. Then, through the cooperation of the pressure plate 3 and the clamp block 5, the entire workpiece 4 is clamped and fixed. In addition to processing the tooth surfaces of workpiece 4 at different angles at both ends, the function of automatically reversing and fixing workpiece 4 is also realized.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision gear grinding fixture for automotive steering racks, comprising a base (1) and a controller, wherein a plurality of hydraulic cylinders (13) are fixed on the inner wall of the base (1), and a pressure plate (3) rotating on the inner wall of the base (1) is provided at the output end of the hydraulic cylinders (13), wherein a workpiece (4) is attached to the upper outer wall of the pressure plate (3), and a clamping block (5) detachably mounted on the upper side of the base (1) is attached to the outer wall of the workpiece (4) away from the pressure plate (3), characterized in that, The workpiece (4) has a cylinder (6) fixed to the upper side of the base (1) at both ends and a front baffle (9) respectively. The workpiece (4) has a bracket (7) fixed to the outer wall of the base (1) at the middle. The workpiece (4) has an adjusting ring (10) that rotates on the outer wall of the front baffle (9) on the outside. The adjusting ring (10) has an inclined block (16) that fits against the tooth surface of the workpiece (4) on the outer wall. The inclined block (16) has a support seat (18) fixed to the upper side of the base (1) on the outer wall. The workpiece (4) has a cylinder (8) fixed to the upper side of the base (1) on the outer wall away from the inclined block (16).

2. The precision grinding fixture for automotive steering racks according to claim 1, characterized in that, The outer wall of the adjusting ring (10) is fixed with a connecting seat (11). The outer walls of the inclined block (16) slide through the inner wall of the connecting seat (11). The outer wall of the connecting seat (11) is fixed with an electric push rod (17). The side of the inclined block (16) away from the workpiece (4) is detachably installed at the output end of the electric push rod (17). One side of the connecting seat (11) is attached to the outer wall of the support seat (18). The other side of the connecting seat (11) is set with an incline.

3. The precision grinding fixture for automotive steering racks according to claim 2, characterized in that, The inner wall of the inclined block (16) is provided with a locking component (23), the locking component (23) includes an electromagnet (232) fixed to the inner wall of the inclined block (16), a locking rod (231) is slidably provided on the inner wall of the inclined block (16), and the inner wall of the connecting seat (11) is provided with a plurality of locking holes (230) that cooperate with the locking rod (231) to slide.

4. The precision grinding fixture for automotive steering racks according to claim 1, characterized in that, The outer wall of the front baffle (9) is rotatably connected to a rotating rod (24) that is in contact with one end of the workpiece (4). One end of the rotating rod (24) passes through the adjusting ring (10) and is away from the side of the front baffle (9). The output end of the cylinder (6) is fixedly provided with a bearing (12) that is in contact with the other end of the workpiece (4).

5. The precision grinding fixture for automotive steering racks according to claim 1, characterized in that, A reversing assembly (2) is provided on the lower side of the base (1). The reversing assembly (2) includes an electric push rod (200) fixed on the lower side of the base (1). The output end of the electric push rod (200) is located on the lower side of the bracket (7).

6. The precision grinding fixture for automotive steering racks according to claim 5, characterized in that, Multiple bearings (202) are attached to and roll along the outer wall of the middle part of the workpiece (4), and the outer walls of the multiple bearings (202) are rotatably connected to the outer wall of the bracket (7).

7. The precision grinding fixture for automotive steering racks according to claim 6, characterized in that, The inner wall of the bracket (7) is fixed with a motor (203), the output end of the electric push rod (200) is fixed with a gear (205), the output end of the motor (203) is fixed with a gear (204) that meshes with the tooth end of the gear (205), the outer wall of the front baffle (9) is fixed with a motor (19), and the output end of the motor (19) is fixed at one end of the rotating rod (24).

8. The precision grinding fixture for automotive steering racks according to claim 7, characterized in that, An electromagnet (201) is attached to the lower middle part of the workpiece (4). The outer wall of the electromagnet (201) slides on the inner wall of the bracket (7). The inner bottom wall of the electromagnet (201) is attached to the inner top wall of the bracket (7).

9. The precision gear grinding fixture for an automotive steering rack according to claim 1, characterized in that, The upper side of the base (1) is fixed with a fixed seat (20) for supporting the cylinder (8). The output end of the cylinder (8) is fixed with a bracket (22). The bracket (22) has a V-shaped groove on the side near the workpiece (4). Multiple pressing rollers (21) are rolled against the outer wall of the workpiece (4) away from the inclined block (16). The multiple pressing rollers (21) are evenly distributed and rotate on the inner walls of the V-shaped groove on both sides of the bracket (22).

10. The precision grinding fixture for automotive steering racks according to claim 1, characterized in that, The pressure plate (3) has a drive handle one (14) and a drive handle two (15) rotating between its two side walls. The lower side of the drive handle two (15) is fixed to the inner wall of the base (1), and the output end of the hydraulic cylinder (13) is fixed to the outer wall of the drive handle one (14).

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