Auxiliary supporting device for workpiece shaft

Abstract

The utility model relates to the technical field of auxiliary supporting of machine tools, in particular to an auxiliary supporting device for a workpiece shaft, which comprises a workbench, a clamping spindle, a tailstock, a tip and an auxiliary supporting component, the upper side of the left part of the workbench is fixedly provided with the clamping spindle, and the clamping spindle is used for clamping the workpiece shaft and driving the workpiece shaft to rotate; a tailstock is slidably mounted on the upper side of the right portion of the workbench. According to the utility model, the structure is reasonable and compact, by arranging the tailstock and the tip, the end part of the workpiece shaft can be supported and jacked, by arranging the auxiliary supporting assembly, the auxiliary supporting effect on the slender shaft type (the length-diameter ratio is greater than 25) workpiece shaft can be realized, the slender shaft type workpiece shaft can be prevented from being deformed when the stress is relatively large during processing, and the processing efficiency is improved. Therefore, the situation that surface errors and form and position errors are larger than design requirements after the slender shaft type workpiece shafts are machined is avoided, the machining quality of the slender shaft type workpiece shafts can be improved, and the workpiece shafts of various specifications can be supported.

Description

Technical Field

[0001] This utility model relates to the field of machine tool auxiliary support technology, and is a workpiece shaft auxiliary support device. Background Technology

[0002] Shafts are an important type of part to be machined on a lathe. Machining primarily involves the machining of outer cylindrical surfaces, inner cylindrical surfaces, arc surfaces, and threads. Slender shafts, due to their long length-to-diameter ratio, have relatively poor rigidity. During machining, the external forces exerted on slender shafts can cause significant deformation. Slender shafts typically refer to shafts with a length-to-diameter ratio greater than 25. During the machining of slender shafts, the deformation due to insufficient rigidity can range from 0.2 to 1 mm. This significant deformation is difficult to eliminate and can severely impact the surface finish and form / position errors of the machined slender shaft.

[0003] Machining slender shafts is a challenging process. Due to their relatively poor rigidity, the ends of the slender shaft are relatively rigid due to the action of the spindle chuck and center, while the middle section is less rigid. Under the influence of clamping force and cutting heat, the slender shaft can be bent, which can easily lead to severe tool deflection during machining. This can result in a drum-shaped error after turning the slender shaft, which is thicker in the middle and thinner at both ends, seriously affecting the machining quality of the slender shaft.

[0004] Chinese patent document CN221088141U discloses a novel hydraulic four-point self-centering center frame, which includes: an annular frame, a cylindrical hole at the bottom of the annular frame, a first hydraulic cylinder fixedly connected in the cylindrical hole, a second hydraulic cylinder fixedly installed at the top of the annular frame, the first hydraulic cylinder and the second hydraulic cylinder being axially symmetrically arranged, and a support mechanism for fixing the workpiece being installed at the piston rod end of both the first hydraulic cylinder and the second hydraulic cylinder, and a shaft-like workpiece being connected between the two support mechanisms.

[0005] Chinese patent document CN221184727 U discloses a bidirectional self-centering hydraulic follow-tool center rest, which includes: a machining platform, a bearing seat on the top left side of the machining platform, a first drive motor on the back of the bearing seat, a three-jaw chuck inserted into the right side of the bearing seat, a moving assembly on the top of the machining platform and located on the right side of the bearing seat, and a bidirectional self-centering cutting assembly on top of the moving assembly; the moving assembly includes a moving groove, two sets of moving blocks are arranged inside the moving groove, a threaded rod is arranged inside the moving groove and passes through the moving blocks, and a second drive motor is arranged on the right side wall of the machining platform; the bidirectional self-centering cutting assembly includes a moving seat, two electric slide rails are arranged on both sides of the top of the moving seat, electric sliders are arranged inside the electric slide rails, a fixed seat is arranged on the top between multiple electric sliders, a hydraulic push rod is arranged on the top of two fixed seats, an adjusting seat is arranged on the top of the hydraulic push rod, a rotating shaft is arranged on the top of the adjusting seat, a cutting tool holder is arranged on the top of the rotating shaft, and a cutting tool is arranged on the inner side of the cutting tool holder.

[0006] The two types of center rests mentioned above cannot be matched with lathes or grinding machines when used for machining slender shaft workpieces, and cannot meet the machining needs of workpieces with various lengths and diameters. When used for machining slender shaft workpieces, the support area is small, and slender shaft tools are still prone to deformation during machining, resulting in low machining quality. Summary of the Invention

[0007] This utility model provides a workpiece shaft auxiliary support device, which overcomes the shortcomings of the prior art and can effectively solve the problems of easy deformation and low processing quality in the processing of existing slender shaft tools.

[0008] The technical solution of this utility model is achieved through the following measures: A workpiece shaft auxiliary support device includes a worktable, a clamping spindle, a tailstock, a center, and an auxiliary support assembly. The clamping spindle is fixedly installed on the upper left side of the worktable. The clamping spindle is used to clamp the workpiece shaft and drive the workpiece shaft to rotate. The tailstock is slidably installed on the upper right side of the worktable. A center is fixedly installed on the left side of the tailstock. The central axis of the center is coaxial with the central axis of the clamping spindle. An auxiliary support assembly is installed on the upper side of the worktable corresponding to the position between the tailstock and the clamping spindle. The auxiliary support assembly includes a support frame, a lifting mechanism, and a bearing. The support frame is slidably installed on the upper side of the worktable corresponding to the position between the tailstock and the clamping spindle. The support frame is provided with a lifting assembly that enables the bearing to move up and down. The upper end of the bearing is provided with an upward-opening arc-shaped support groove. The central axis of the support groove is coplanar with the central axis of the clamping spindle.

[0009] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0010] The aforementioned lifting assembly may include a vertical guide rail, a vertical slider, a mounting block, and a linear drive mechanism. A vertical slider is fixedly installed inside the support frame, and a mounting block is provided behind the vertical slider. A vertical guide rail, which is slidably installed on the inner rear side of the vertical slider, is fixedly installed on the front side of the mounting block. A bearing bush is fixedly installed on the upper side of the mounting block, and a linear drive mechanism that enables the mounting block to move up and down is fixedly installed on the lower rear side of the mounting block.

[0011] The aforementioned lifting assembly may further include a fine-tuning screw, a fixing plate, a fine-tuning slide plate, and a fine-tuning nut. The upper rear side of the mounting block is provided with a sliding groove with a rearward opening. A fixing plate is fixedly installed on the rear side of the mounting block. A fine-tuning screw hole that runs through the front and rear of the fixing plate is provided on the rear side of the fixing plate. A fine-tuning screw is screwed into the fine-tuning screw hole. The front end of the fine-tuning screw is rotatably installed on the front of the mounting block. A fine-tuning slide plate is slidably installed in the sliding groove along the front and rear direction. The upper side of the fine-tuning slide plate is fixedly installed together with the lower side of the bearing bush. A fine-tuning nut that is screwed to the outside of the fine-tuning screw is fixedly installed on the lower side of the fine-tuning slide plate.

[0012] The aforementioned worktable has a front guide rail and a rear guide rail fixedly installed at intervals on the upper right side. A stepper screw is rotatably installed in the middle of the worktable, corresponding to the position between the front and rear guide rails. A stepper motor is installed on the left side of the worktable. The right end of the output shaft of the stepper motor is driven and installed together with the left end of the stepper screw. At least one first slider is fixedly installed on the lower front side of the support frame at intervals on the left and right, and at least one second slider is fixedly installed on the lower rear side of the support frame at intervals on the left and right, and at least one second slider is fixedly installed on the lower rear side of the support frame at intervals on the left and right. A first screw nut screwed to the outside of the stepper screw is fixedly installed on the lower middle side of the support frame. A slide is fixedly installed on the lower side of the tailstock. At least one third slider is fixedly installed on the lower front side of the slide at intervals on the left and right, and at least one fourth slider is fixedly installed on the lower rear side of the slide at intervals on the left and right, and a second screw nut screwed to the outside of the stepper screw is fixedly installed on the lower middle side of the slide.

[0013] A fixing block can be provided above the tailstock. An adjusting plate is fixedly installed on the right side of the tailstock. The adjusting plate has a left-right through adjusting screw hole on the right side. An adjusting screw is screwed into the adjusting screw hole. The left end of the adjusting screw is rotatably installed with the fixing block. A left-right adjusting guide rail is fixedly installed on the upper side of the tailstock. An adjusting slider is slidably installed on the outer side of the adjusting guide rail. The upper side of the adjusting slider is fixedly installed with the lower side of the fixing block. The top is fixedly installed on the left side of the rear part of the fixing block.

[0014] The upper rear end face of the aforementioned bearing bush is located above the upper front end face of the bearing bush.

[0015] A rotary table can be installed on the underside of the aforementioned workbench, and a probe is fixedly installed on the front left side of the workbench.

[0016] This utility model has a reasonable and compact structure. By setting a tailstock and a center, it can provide support and tightening for the end of the workpiece shaft. By setting an auxiliary support component, it can provide auxiliary support for slender shafts (length-to-diameter ratio greater than 25), which can prevent deformation of slender shafts under large forces during processing. This avoids the surface error and form and position error of slender shafts after processing from exceeding the design requirements, thereby improving the processing quality of slender shafts. It can also provide support for workpiece shafts of various specifications. Attached Figure Description

[0017] Appendix Figure 1 These are schematic diagrams of the main structure of embodiments one to seven of this utility model.

[0018] Appendix Figure 2 This is a right-side structural schematic diagram of embodiments one to seven of this utility model.

[0019] Appendix Figure 3 This is a schematic diagram of the left-side structure of embodiments one to seven of this utility model.

[0020] Appendix Figure 4 This is a top view of the structure of embodiments one to seven of this utility model.

[0021] Appendix Figure 5 This is a three-dimensional structural diagram of embodiments one to seven of this utility model. Figure 1 .

[0022] Appendix Figure 6 This is a three-dimensional structural diagram of embodiments one to seven of this utility model. Figure 2 .

[0023] Appendix Figure 7 This is a three-dimensional structural diagram of the preferred embodiment of the present utility model.

[0024] The codes in the attached diagram are as follows: 1 is the worktable, 2 is the clamping spindle, 3 is the tailstock, 4 is the center, 5 is the support frame, 6 is the bearing, 7 is the support groove, 8 is the vertical guide rail, 9 is the vertical slider, 10 is the mounting block, 11 is the linear drive mechanism, 12 is the fine-tuning screw, 13 is the fixing plate, 14 is the fine-tuning slide plate, 15 is the fine-tuning nut, 16 is the front guide rail, 17 is the rear guide rail, 18 is the stepper screw, 19 is the stepper motor, 20 is the first slider, 21 is the second slider, 22 is the first screw nut, 23 is the slide block, 24 is the third slider, 25 is the fourth slider, 26 is the second screw nut, 27 is the fixing block, 28 is the adjusting plate, 29 is the adjusting screw, 30 is the adjusting guide rail, 31 is the adjusting slider, 32 is the rotary table, 33 is the probe, and 34 is the workpiece axis. Detailed Implementation

[0025] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0026] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0027] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0028] Example 1: As shown in the attached document Figures 1 to 7 As shown, the workpiece shaft auxiliary support device includes a worktable 1, a clamping spindle 2, a tailstock 3, a center 4, and an auxiliary support assembly. The clamping spindle 2 is fixedly installed on the upper left side of the worktable 1. The clamping spindle 2 is used to clamp the workpiece shaft 34 and drive the workpiece shaft 34 to rotate. The tailstock 3 is slidably installed on the upper right side of the worktable 1. The center 4 is fixedly installed on the left side of the tailstock 3. The central axis of the center 4 is coaxial with the central axis of the clamping spindle 2. An auxiliary support assembly is installed on the upper side of the worktable 1 corresponding to the position between the tailstock 3 and the clamping spindle 2. The auxiliary support assembly includes a support frame 5, a lifting mechanism, and a bearing bush 6. The support frame 5 is slidably installed on the upper side of the worktable 1 corresponding to the position between the tailstock 3 and the clamping spindle 2. The support frame 5 is provided with a lifting assembly that allows the bearing bush 6 to move up and down. The upper end of the bearing bush 6 is provided with an upward-opening arc-shaped support groove 7. The central axis of the support groove 7 is coplanar with the central axis of the clamping spindle 2.

[0029] According to the requirements, the clamping spindle 2 uses existing known technology, such as the SM4653 grinding electric spindle. During use, the tailstock 3 and center 4 provide support and clamping to the end of the workpiece spindle 34. The auxiliary support components provide auxiliary support for slender shafts (length-to-diameter ratio greater than 25) of the workpiece spindle 34. The arc-shaped support groove 7 ensures sufficient support area with the workpiece spindle 34, preventing deformation of the slender shaft workpiece spindle 34 under high force during machining. This avoids surface and position errors of the slender shaft workpiece spindle 34 exceeding design requirements after machining, thus improving the machining quality of the slender shaft workpiece spindle 34. It can also support workpiece spindles 34 of various specifications.

[0030] The above-mentioned workpiece shaft auxiliary support device can be further optimized and / or improved according to actual needs:

[0031] Example 2: As an optimization of the above examples, as shown in the appendix. Figure 1 , 4As shown in Figures 5 and 6, the lifting assembly includes a vertical guide rail 8, a vertical slider 9, a mounting block 10, and a linear drive mechanism 11. The vertical slider 9 is fixedly installed inside the support frame 5. The mounting block 10 is located behind the vertical slider 9. The vertical guide rail 8, which is slidably installed on the inner rear side of the vertical slider 9, is fixedly installed on the front side of the mounting block 10. The bearing 6 is fixedly installed on the upper side of the mounting block 10 on the lower rear side. The linear drive mechanism 11, which enables the mounting block 10 to move up and down, is fixedly installed on the lower rear side of the mounting block 10.

[0032] Depending on the requirements, the linear drive mechanism 11 is a known technology, such as a linear motor. During use, this configuration allows adjustment of the height of the bearing bush 6, enabling the inner wall of the support groove 7 to provide auxiliary support for workpiece shafts 34 of different diameters. When the workpiece shaft 34 no longer requires auxiliary support, the linear drive mechanism 11 can lower the bearing bush 6 below the workpiece shaft 34, thus meeting the support requirements for processing workpiece shafts 34 of various specifications.

[0033] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 1 , 4 As shown in Figures 5 and 6, the lifting assembly also includes a fine-tuning screw 12, a fixing plate 13, a fine-tuning slide plate 14, and a fine-tuning nut 15. The upper rear side of the mounting block 10 is provided with a sliding groove with an opening facing backward. The fixing plate 13 is fixedly installed on the rear side of the mounting block 10. The rear side of the fixing plate 13 is provided with a fine-tuning screw hole that runs through the front and rear. The fine-tuning screw 12 is screwed into the fine-tuning screw hole. The front end of the fine-tuning screw 12 is rotatably installed on the front of the mounting block 10. The fine-tuning slide plate 14 is slidably installed in the sliding groove along the front and rear direction. The upper side of the fine-tuning slide plate 14 is fixedly installed together with the lower side of the bearing bush 6. The lower side of the fine-tuning slide plate 14 is fixedly installed with a fine-tuning nut 15 screwed to the outside of the fine-tuning screw 12.

[0034] Depending on the requirements, the fine-tuning nut 15 and the fine-tuning slide plate 14 are integrally set. The screw hole of the fine-tuning nut 15 can also be a threaded hole on the fine-tuning slide plate 14, and the fine-tuning screw 12 is screwed into the threaded hole. During use, by setting the fine-tuning screw 12, the front and rear positions of the fine-tuning slide plate 14 and the bearing 6 can be adjusted. This can reduce the installation error between the vertical guide rail 8 and the vertical slider 9, and enable the support groove 7 of the bearing 6 to better match the outer wall of the workpiece shaft 34. This ensures the support function of the inner wall of the support groove 7 for the slender shaft type workpiece shaft 34, thereby preventing the slender shaft type workpiece shaft 34 from bending and deforming during processing.

[0035] Example 4: As an optimization of the above examples, as shown in the appendix. Figures 1 to 7As shown, a front guide rail 16 and a rear guide rail 17 are fixedly installed at intervals on the upper right side of the worktable 1. A stepper screw 18 is rotatably installed in the middle of the worktable 1, corresponding to the position between the front guide rail 16 and the rear guide rail 17. A stepper motor 19 is installed on the left side of the worktable 1. The right end of the output shaft of the stepper motor 19 is driven and installed together with the left end of the stepper screw 18. At least one first slider 21 is fixedly installed at intervals on the lower front side of the support frame 5, and is slidably mounted on the outer side of the front guide rail 16. At least one first slider 21 is fixedly installed at intervals on the lower rear side of the support frame 5, and is slidably mounted on the outer side of the front guide rail 16. The second slider 21 on the outer side of the rear guide rail 17, the first screw nut 22 screwed to the outer side of the stepping screw 18 is fixedly installed on the lower side of the middle part of the support frame 5, the slide 23 is fixedly installed on the lower side of the tailstock 3, at least one third slider 24 slidably installed on the outer side of the front guide rail 16 is fixedly installed on the lower side of the front part of the slide 23 at intervals, at least one fourth slider 25 slidably installed on the outer side of the rear guide rail 17 is fixedly installed on the lower side of the rear part of the slide 23 at intervals, and the second screw nut 26 screwed to the outer side of the stepping screw 18 is fixedly installed on the lower side of the middle part of the slide 23.

[0036] During use, this configuration allows the stepper motor 19 to drive the first lead screw nut 22 and the second lead screw nut 26 to move left and right simultaneously via the stepper screw 18. This supports various sizes of slender shafts 34, preventing complete deformation of the workpiece shaft 34 due to excessive force during processing. Alternatively, the support frame 5 can be disassembled from the first lead screw nut 22 as needed. In this case, the stepper motor 19 can drive only the second lead screw nut 26 to move left and right via the stepper screw 18, supporting the right end of the workpiece shaft 34 and ensuring its processing accuracy. The distance between the first lead screw nut 22 and the second lead screw nut 26 can also be set according to the length of the batch of workpiece shafts 34 to be processed. This allows the first lead screw nut 22 and the second lead screw nut 26 to move synchronously left and right during processing, shortening the processing waiting time.

[0037] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figures 4 to 7, a fixing block 27 is provided above the tailstock 3, and an adjusting plate 28 is fixedly installed on the right side of the tailstock 3. The adjusting plate 28 has a left-right through adjusting screw hole on the right side, and an adjusting screw 29 is screwed into the adjusting screw hole. The left end of the adjusting screw 29 is rotatably installed together with the fixing block 27. A left-right adjusting guide rail 30 is fixedly installed on the upper side of the tailstock 3, and an adjusting slider 31 is slidably installed on the outer side of the adjusting guide rail 30. The upper side of the adjusting slider 31 is fixedly installed together with the lower side of the fixing block 27. The tip 4 is fixedly installed on the left side of the rear part of the fixing block 27.

[0038] To isolate the workpiece shaft 34 from the influence of coolant during machining, protective covers are fixed to the upper right side of the support frame 5 and the upper side of the slide block 23, as required. During use, this setup facilitates precise adjustment of the initial position of the left end of the center point 4, preventing excessive or insufficient pressure on the right end of the workpiece shaft 34 due to errors between the stepper screw 18 and the second screw nut 26. Adjusting the center point position prevents bending deformation of the workpiece shaft 34 due to excessive pressure from the left end of the center point 4, or complete deformation due to excessive force during machining due to insufficient pressure from the left end of the center point 4 on the right end of the workpiece shaft 34. The distance between the left end of the center point 4 and the right end of the clamping spindle 2 can be adjusted using the adjusting screw 29, thus meeting the support and clamping requirements of the right end of workpiece shafts 34 of various lengths, reducing errors during machining, and ensuring machining quality.

[0039] Example 6: As an optimization of the above examples, as shown in the appendix Figure 1 , 5 As shown in Figures 7 and 8, the upper rear end face of the bearing 6 is located above the upper front end face of the bearing 6.

[0040] During use, this setting allows for a larger inlet space within the bearing bush 6 for the slender shaft tool to be processed, reducing the difficulty of matching the slender shaft tool with the bearing bush 6 and improving the assembly efficiency between the bearing bush 6 and the slender shaft tool.

[0041] Example 7: As an optimization of the above examples, as shown in the appendix. Figures 1 to 7 As shown, a rotary table 32 is installed on the lower side of the worktable 1, and a probe 33 is fixedly installed on the front left side of the worktable 1.

[0042] Based on the requirements, the rotary table 32 is a known existing technology, such as a CNC rotary table, and the probe 33 is a known existing technology, such as an OSP60 probe. During use, by setting the rotary table 32, the worktable 1 can be rotated in the horizontal plane, thereby causing the clamping spindle 2 and workpiece shaft 34 to rotate in the horizontal plane. This allows for various processing techniques on the workpiece shaft 34, such as grinding the spiral groove of the workpiece shaft 34. The probe 33 facilitates the measurement of the specifications of the machining tools, such as the diameter of the grinding wheel, and can also measure the position of the tool to be processed, thus improving the machining quality of the workpiece shaft 34.

[0043] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A workpiece shaft auxiliary support device, characterized in that... The device includes a worktable, a clamping spindle, a tailstock, a center, and an auxiliary support assembly. The clamping spindle is fixedly installed on the upper left side of the worktable. The clamping spindle is used to clamp the workpiece shaft and drive the workpiece shaft to rotate. The tailstock is slidably installed on the upper right side of the worktable. A center is fixedly installed on the left side of the tailstock. The central axis of the center is coaxial with the central axis of the clamping spindle. An auxiliary support assembly is installed on the upper side of the worktable corresponding to the position between the tailstock and the clamping spindle. The auxiliary support assembly includes a support frame, a lifting mechanism, and a bearing. The support frame is slidably installed on the upper side of the worktable corresponding to the position between the tailstock and the clamping spindle. The support frame is equipped with a lifting assembly that allows the bearing to move up and down. The upper end of the bearing is provided with an upward-opening arc-shaped support groove. The central axis of the support groove is coplanar with the central axis of the clamping spindle.

2. The workpiece shaft auxiliary support device according to claim 1, characterized in that... The lifting assembly includes a vertical guide rail, a vertical slider, a mounting block, and a linear drive mechanism. The vertical slider is fixedly installed inside the support frame, and the mounting block is located behind the vertical slider. The vertical guide rail, which is slidably installed on the inner rear side of the vertical slider, is fixedly installed on the front side of the mounting block. The lower side of the bearing is fixedly installed on the upper side of the mounting block, and the linear drive mechanism, which enables the mounting block to move up and down, is fixedly installed on the lower rear side of the mounting block.

3. The workpiece shaft auxiliary support device according to claim 2, characterized in that... The lifting assembly also includes a fine-tuning screw, a fixing plate, a fine-tuning slide plate, and a fine-tuning nut. The upper rear side of the mounting block has a sliding groove with an opening facing backward. The fixing plate is fixedly installed on the rear side of the mounting block. The rear side of the fixing plate has a fine-tuning screw hole that runs through the front and back. A fine-tuning screw is screwed into the fine-tuning screw hole. The front end of the fine-tuning screw is rotatably installed on the front of the mounting block. A fine-tuning slide plate is slidably installed in the sliding groove along the front and back direction. The upper side of the fine-tuning slide plate is fixedly installed together with the lower side of the bearing. A fine-tuning nut is fixedly installed on the lower side of the fine-tuning slide plate and screwed to the outside of the fine-tuning screw.

4. The workpiece shaft auxiliary support device according to claim 1, 2, or 3, characterized in that... A front guide rail and a rear guide rail are fixedly installed at intervals on the upper right side of the worktable. A stepper screw is rotatably installed in the middle of the worktable, corresponding to the position between the front and rear guide rails. A stepper motor is installed on the left side of the worktable. The right end of the output shaft of the stepper motor is driven and installed together with the left end of the stepper screw. At least one first slider is fixedly installed at intervals on the lower front side of the support frame, which is slidably mounted on the outside of the front guide rail. At least one second slider is fixedly installed at intervals on the lower rear side of the support frame, which is slidably mounted on the outside of the rear guide rail. A first screw nut is fixedly installed on the lower middle side of the support frame, which is screwed to the outside of the stepper screw. A slide is fixedly installed on the lower side of the tailstock. At least one third slider is fixedly installed at intervals on the lower front side of the slide, which is slidably mounted on the outside of the front guide rail. At least one fourth slider is fixedly installed at intervals on the lower rear side of the slide, which is slidably mounted on the outside of the rear guide rail. A second screw nut is fixedly installed on the lower middle side of the slide, which is screwed to the outside of the stepper screw.

5. The workpiece shaft auxiliary support device according to claim 4, characterized in that... A fixed block is provided above the tailstock, and an adjustment plate is fixedly installed on the right side of the tailstock. The right side of the adjustment plate has a through-hole adjustment screw hole, and an adjustment screw is screwed into the adjustment screw hole. The left end of the adjustment screw is rotatably installed with the fixed block. A left-right adjustment guide rail is fixedly installed on the upper side of the tailstock. An adjustment slider is slidably installed on the outer side of the adjustment guide rail. The upper side of the adjustment slider is fixedly installed with the lower side of the fixed block. The top is fixedly installed on the left side of the rear of the fixed block.

6. The workpiece shaft auxiliary support device according to claim 1, 2, 3, or 5, characterized in that... The upper rear end face of the bearing bush is located above the upper front end face of the bearing bush.

7. The workpiece shaft auxiliary support device according to claim 4, characterized in that... The upper rear end face of the bearing bush is located above the upper front end face of the bearing bush.

8. The workpiece shaft auxiliary support device according to claim 1, 2, 3, or 5, characterized in that... A rotary table is installed on the underside of the workbench, and a probe is fixedly installed on the front left side of the workbench.

9. The workpiece shaft auxiliary support device according to claim 4, characterized in that... A rotary table is installed on the underside of the workbench, and a probe is fixedly installed on the front left side of the workbench.

10. The workpiece shaft auxiliary support device according to claim 6, characterized in that... A rotary table is installed on the underside of the workbench, and a probe is fixedly installed on the front left side of the workbench.

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