Automobile part grinder processing positioning tool

Abstract

The utility model relates to positioning frock technical field, and disclose a kind of automobile parts grinding machine processing positioning frock;Including bottom plate, still include: V type adjusting mechanism, including the first slider and second slider of sliding setting in bottom plate top surface, the opposite bevel of two sliders jointly constitute V type positioning surface, the first slider and second slider bottom are respectively fixed with first inverted T type chip removal slider and second inverted T type chip removal slider;The utility model is driven first slider, second slider synchronous opposite or opposite movement by two-way screw rod mechanism, can be flexibly adjusted the opening size of V type positioning surface, without disassembling any component can be adapted to the shaft workpiece of different outer diameter, and adjustment process only needs to rotate handlebar to complete, without repeatedly fastening bolt, debugging equipment, effectively reduce frock replacement time, improve machine tool effective processing working hour;When V type positioning surface appears abrasion, only need to axially pull handlebar unlocking screw rod, rotate handlebar fine adjustment slider position to compensate wear amount.

Description

Technical Field

[0001] This utility model relates to the field of positioning tooling technology, specifically to a positioning tooling for grinding automotive parts. Background Technology

[0002] In the field of grinding, V-blocks are commonly used as positioning elements for the external cylindrical grinding of shaft-type workpieces. Traditional V-blocks are integral hardened steel structures that are fixed in the T-slots of the grinding machine's worktable by T-bolts. Radial positioning and support are achieved by utilizing the four-point contact between the V-shaped positioning surface and the cylindrical surface of the workpiece.

[0003] However, with the increasing demand for multi-variety, small-batch production, traditional V-blocks have revealed the following problems: The V-shaped opening size of traditional V-blocks is fixed. When the workpiece diameter changes, the entire block needs to be disassembled and replaced with a thickened pad of the corresponding specification or a brand new V-block. Then, the bolts need to be tightened and the equipment needs to be adjusted, which affects the effective working hours of the machine tool. Although the positioning surface of the fixed V-block is hardened, under high-frequency, high-load grinding conditions, the V-shaped surface will still show local depressions or micro-abrasive scratches. These depressions cause the workpiece to sink, resulting in the actual grinding center being offset from the theoretical center. Since the V-block is rigidly bolted to the machine tool table, the amount of wear cannot be adjusted online. Operators usually rely on adding thin pads or manually scraping the V-surface to temporarily compensate. However, due to limitations in human experience, the compensation accuracy is low and the consistency is poor, making it difficult to guarantee the stable positioning accuracy of batch workpieces. Utility Model Content

[0004] The purpose of this utility model is to provide a positioning fixture for grinding automotive parts to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a positioning fixture for machining automotive parts on a grinding machine, including a base plate, and further comprising:

[0006] The V-shaped adjustment mechanism includes a first slider and a second slider that are slidably disposed on the top surface of the base plate. The opposing inclined surfaces of the two sliders together form a V-shaped positioning surface. The bottom of the first slider and the second slider are respectively fixed with a first inverted T-shaped anti-chip slider and a second inverted T-shaped anti-chip slider.

[0007] A bidirectional lead screw mechanism includes a lead screw body rotatably disposed inside a base plate. The lead screw body has a first threaded section and a second threaded section with opposite directions of rotation, and forms a helical pair with the first inverted T-shaped anti-chip slider and the second inverted T-shaped anti-chip slider respectively, so as to drive the two sliders to move synchronously towards or away from each other. One end of the lead screw body extends outward and is fixedly connected to a throttle handle.

[0008] The locking mechanism includes a locking base fixed to the side wall of the base plate. A fixed gear disc is coaxially arranged on the side of the locking base. The fixed gear disc remains stationary relative to the grinding machine bed during use and is coaxially arranged with the lead screw body. A movable gear disc is meshed with the side of the fixed gear disc. A connecting rod is fixedly connected to the inner cavity of the movable gear disc. The connecting rod is fixedly connected to the smooth section of the lead screw body, so that the movable gear disc and the lead screw body rotate synchronously and can slide axially. A disc spring is arranged between the movable gear disc and the locking base. When the throttle is pulled axially, the lead screw body pulls the movable gear disc through the connecting rod to compress the disc spring and disengage, thereby unlocking the mechanism.

[0009] Preferably, the bidirectional lead screw mechanism further includes a first bearing seat and a second bearing seat respectively fixed inside the base plate, and the lead screw body is rotatably supported between the first bearing seat and the second bearing seat.

[0010] Preferably, the locking mechanism further includes a disc spring seat fixed in the inner cavity of the locking base. A disc spring is sleeved on the outer wall of the disc spring seat. A guide blind hole is provided on the side of the movable gear plate. The guide blind hole is slidably engaged with the disc spring seat. The inner wall of the guide blind hole is fixedly connected to the connecting rod. The connecting rod and the smooth rod section of the lead screw body are both rotatable and axially slidably connected inside the locking base.

[0011] Preferably, the top of the base plate is provided with a positioning mechanism, which includes two independently adjustable positioning bases disposed on the top surface of the base plate. Each positioning base has two support blocks fixedly connected to its side. The support blocks have gripping holes on their side. Each positioning base has two toothed plates at its bottom. The top surface of the base plate has toothed grooves that mesh with the toothed plates to prevent the positioning base from sliding along the centering direction of the slider.

[0012] Preferably, the positioning mechanism further includes a scale bar parallel to the side of the tooth groove, and a rectangular through hole penetrating the base plate is opened on the bottom surface of the tooth groove. The rectangular through hole corresponds to the position of the tooth plate. The two positioning bases are respectively placed on the side of the first slider and the second slider away from the grinding tool, and their end faces can abut against the rear end face of the slider to realize auxiliary positioning of the grinding station.

[0013] Preferably, the base plate has a lead screw groove inside, and the first and second inverted T-shaped anti-chip sliders are both placed in the lead screw groove and supported by their bottom surfaces. The two side walls of the opening of the lead screw groove are recessed to form a bellows cover groove. Limit blocks are fixed to the side walls at both ends of the lead screw groove to block the axial limit position of the corresponding inverted T-shaped anti-chip slider. The top of the base plate has a dovetail guide groove and a nut groove. The dovetail guide groove slides in cooperation with the guide blocks at the bottom of the first and second sliders, respectively. The nut groove has a nut step inside for abutting and positioning with the end face of the T-shaped nut on the grinding machine worktable.

[0014] Preferably, the base plate is fastened to the grinding machine worktable by T-nuts. The upper surface of the base plate is provided with a central bellows cover and two side bellows covers, all three of which are embedded in the bellows cover groove. The two ends of the central bellows cover are respectively fixed to the bottom of the first slider and the second slider. The two sliders are provided with receiving cavities at corresponding positions to receive the central bellows cover when the sliders move towards each other. When the two sliders move away from each other, the central bellows cover is pulled out and exposed to cover the middle opening of the lead screw groove. The fixed ends of the two side bellows covers are fixed to the recessed grooves on the side wall of the base plate by pressure plate screws, and the movable ends are fixed to the outer end face of the corresponding sliders, and extend and retract synchronously with the movement of the sliders.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention uses a bidirectional lead screw mechanism to drive the first and second sliders to move synchronously in opposite directions or in opposite directions, allowing for flexible adjustment of the opening and closing dimensions of the V-shaped positioning surface. It can adapt to shaft workpieces of different outer diameters without disassembling any parts, and the adjustment process can be completed simply by turning the throttle, eliminating the need for repeated bolt tightening and equipment adjustments, effectively reducing tooling change time and increasing the machine tool's effective processing time. When wear occurs on the V-shaped positioning surface, simply pull the throttle axially to unlock the lead screw, and then rotate the throttle to finely adjust the slider position to compensate for the wear. Quantitative adjustment can be achieved through the scale bar, toothed plate, and toothed groove meshing structure of the positioning mechanism, avoiding the experience errors of manual scraping or using thin shims. After adjustment, releasing the throttle locks the toothed disc of the locking mechanism for secure engagement. The fixed slider position ensures that the positioning center of all workpieces is consistent during batch processing, solving the problem of decreased positioning accuracy after wear of traditional tooling. This utility model, on the one hand, uses the rigid contact between the positioning base and the slider to offset the axial force transmitted to the slider by the parts during grinding, preventing the slider from moving backward. On the other hand, the disc spring of the locking mechanism resets and meshes with the gear plate to prevent the slider from shifting due to vibration and rotation of the lead screw. This double protection ensures the stability of the V-shaped positioning surface and further reduces the risk of machining dimensional deviation. The central bellows cover, side bellows cover and inverted T-shaped anti-chip slider can block metal chips and coolant from entering the lead screw groove, reduce the wear of the lead screw and slider mating surfaces, extend the life of the core transmission components, and reduce the overall maintenance frequency and cost of the tooling. Attached Figure Description

[0017] Figure 1 A schematic diagram of the main structure of the positioning fixture for machining automotive parts using this utility model;

[0018] Figure 2 A schematic diagram of the internal structure of the positioning tooling provided by this utility model;

[0019] Figure 3 A schematic diagram of the locking mechanism provided by this utility model

[0020] Figure 4A schematic diagram of the positioning mechanism provided by this utility model;

[0021] Figure 5 Provided by this utility model Figure 4 Enlarged view of the structure at point A;

[0022] Figure 6 Provided by this utility model Figure 4 Enlarged view of the structure at point B;

[0023] Figure 7 A schematic diagram of the internal structure of the base plate provided by this utility model.

[0024] In the diagram: 1. Base plate; 2. V-shaped adjustment mechanism; 3. Bidirectional lead screw mechanism; 4. Positioning mechanism; 5. Locking mechanism; 6. Grinding machine worktable; 7. Central bellows cover; 8. Side bellows cover; 11. Lead screw groove; 12. Dovetail guide groove; 13. Nut groove; 14. Nut step; 15. Bellows cover groove; 16. Limit block; 21. First slider; 22. Second slider; 211. First inverted T-shaped chip-proof slider; 221 31. Second inverted T-shaped anti-chip slider; 32. First bearing seat; 33. Second bearing seat; 34. Lead screw body; 45. Throttle; 46. Positioning base; 47. Support block; 48. Tooth plate; 49. Tooth groove; 40. Rectangular through hole; 41. Grip hole; 42. Scale bar; 53. Locking base; 54. Disc spring seat; 55. Disc spring; 56. Moving toothed disc; 57. Fixed toothed disc; 58. Connecting rod; 59. Guide blind hole. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-7As shown, a positioning fixture for machining automotive parts using a grinding machine includes a base plate 1 and a V-shaped adjustment mechanism 2, comprising a first slider 21 and a second slider 22 slidably disposed on the top surface of the base plate 1. The opposing inclined surfaces of the two sliders together form a V-shaped positioning surface. The bottoms of the first slider 21 and the second slider 22 are respectively fixed with a first inverted T-shaped anti-chip slider 211 and a second inverted T-shaped anti-chip slider 221. The inverted T-shaped structure can block the opening of the lead screw groove 11, preventing grinding debris from entering the lead screw area, and forming a double anti-chip effect with the bellows cover; a bidirectional lead screw mechanism 3, comprising a lead screw body 33 rotatably disposed inside the base plate 1, the lead screw body 33 having a first thread segment and a second thread segment with opposite directions of rotation. The screw has two threaded sections, forming a helical pair with the first inverted T-shaped chip-resistant slider 211 and the second inverted T-shaped chip-resistant slider 221, respectively, to drive the two sliders to move synchronously towards or away from each other. One end of the screw body 33 extends outward and is fixedly connected to a handle 34. Rotating the handle 34 causes the screw body 33 to rotate around its own axis. Since the first and second threaded sections have opposite directions of rotation, the helical pair drives the first inverted T-shaped chip-resistant slider 211 and the second inverted T-shaped chip-resistant slider 221 to move synchronously towards or away from each other along the axial direction of the screw body 33, thereby driving the first slider 21 and the second slider 22 to move synchronously, adjusting the opening and closing dimensions of the V-shaped positioning surface to adapt to the positioning of workpieces with different outer diameters; locking mechanism 5. The system includes a locking base 51 fixed to the side wall of the base plate 1. A fixed gear disc 55 is coaxially arranged on the side of the locking base 51. The fixed gear disc 55 remains stationary relative to the grinding machine bed during use and is coaxially arranged with the lead screw body 33. A movable gear disc 54 is meshed with the side of the fixed gear disc 55. A connecting rod 56 is fixedly connected to the inner cavity of the movable gear disc 54. The connecting rod 56 is fixedly connected to the smooth section of the lead screw body 33, so that the movable gear disc 54 and the lead screw body 33 rotate synchronously and can slide axially. A disc spring 53 is arranged between the movable gear disc 54 and the locking base 51. When the throttle 34 is pulled axially, the lead screw body 33 pulls the movable gear disc 54 via the connecting rod 56 to compress the disc. When the disc spring 53 disengages, the fixed gear plate 55 is bolted to the grinding machine bed via an L-shaped bracket and is not directly connected to the base plate 1. When unlocking, pulling the throttle 34 transmits axial force through the lead screw body 33 to overcome the preload of the disc spring 53, causing the moving gear plate 54 to slide axially along the lead screw body 33, disengaging the moving gear plate 54 from the fixed gear plate 55. The lead screw body 33 can then rotate freely to adjust the slider. When locking, releasing the throttle 34 restores the deformation of the disc spring 53, pushing the moving gear plate 54 to slide axially and re-engage with the fixed gear plate 55, limiting the torsion of the lead screw body 33, preventing grinding vibration from causing slider position displacement, and ensuring machining dimensional accuracy.

[0027] The bidirectional lead screw mechanism 3 also includes a first bearing seat 31 and a second bearing seat 32 respectively fixed inside the base plate 1. The lead screw body 33 is rotatably supported between the first bearing seat 31 and the second bearing seat 32. The first bearing seat 31 and the second bearing seat 32 are recessed into the base plate 1. The two ends of the lead screw body 33 are supported by bearings, which only bear torque and not bending moment. At the same time, it avoids the protrusion above the tooling, increases the space for the grinding wheel to pass through, and reduces the risk of interference between the grinding wheel and the tooling.

[0028] The locking mechanism 5 also includes a disc spring seat 52 fixed in the inner cavity of the locking base 51. A disc spring 53 is sleeved on the outer wall of the disc spring seat 52. A guide blind hole 57 is provided on the side of the movable gear plate 54. The guide blind hole 57 is slidably engaged with the disc spring seat 52. The inner wall of the guide blind hole 57 is fixedly connected to the connecting rod 56. The connecting rod 56 and the smooth rod section of the lead screw body 33 are both rotatable and axially slidably connected to the inside of the locking base 51. When unlocking, the connecting rod 56 pushes the movable gear plate 54 to slide axially along the outer wall of the disc spring seat 52, compressing the disc spring 53 until the movable gear plate 54 disengages from the fixed gear plate 55. At this time, the lead screw body 33 can freely rotate to adjust the slider. When locking, the disc spring 53 releases the preload and pushes the movable gear plate 54 to slide axially in the opposite direction along the disc spring seat 52. The guide blind hole 57 always guides along the outer wall of the disc spring seat 52, ensuring that the movable gear plate 54 and the fixed gear plate 55 are precisely engaged, avoiding gear plate misalignment that could lead to locking failure, and effectively limiting the torsion of the lead screw body 33.

[0029] A positioning mechanism 4 is provided on the top of the base plate 1. The positioning mechanism 4 includes two independently adjustable positioning bases 41 disposed on the top surface of the base plate 1. Two support blocks 42 are fixedly connected to the side of each positioning base 41. The support blocks 42 have gripping holes 46 on their sides, which facilitate the operator to grip and adjust the positioning base 41 without the need for prying tools, thus improving adjustment efficiency. Two toothed plates 43 are provided at the bottom of each positioning base 41. The top surface of the base plate 1 has toothed grooves 44 that mesh with the toothed plates 43 to prevent the positioning base 41 from sliding along the centering direction of the slider. The positioning mechanism 4 also includes a scale strip 47 parallel to the side of the toothed groove 44. A rectangular through hole 45 penetrating the base plate 1 is provided on the bottom surface of the toothed groove 44. The rectangular through hole 45 corresponds to the position of the toothed plate 43. The two positioning bases 41 are respectively placed on the first slider 21 and the second slider 22. The slider 22 is located away from the grinding tool, and its end face can abut against the rear end face of the slider to achieve auxiliary positioning at the grinding station. The convex teeth of the bottom toothed plate 43 of the positioning base 41 mesh with the concave teeth of the toothed groove 44 of the base plate to prevent the base from sliding along the centering direction of the slider. The tooth pitch corresponds to the graduation of the scale bar 47 and can be quantitatively adjusted to ensure consistent accuracy when different operators adjust the positioning base 41, avoiding manual estimation errors. It is suitable for batch processing scenarios. When the front face of the positioning base 41 is aligned with the maximum scale, the two sliders are in the theoretical centering position without the need for secondary alignment. The rectangular through hole 45 penetrates the base plate 1 and corresponds to the position of the toothed plate 43. The grinding debris in the meshing area falls directly into the hole and is discharged, avoiding the accumulation of grinding debris and affecting the meshing accuracy of the toothed plate 43. The front ends of the two positioning bases 41 abut against the rear end face of the slider to provide rigid positioning for the slider at the grinding station and prevent the slider from moving backward during processing.

[0030] The base plate 1 has a lead screw groove 11 inside. The first inverted T-shaped anti-chip slider 211 and the second inverted T-shaped anti-chip slider 221 are both placed in the lead screw groove 11 and supported by its bottom surface. The neck of the two inverted T-shaped anti-chip sliders and the narrow gap at the top of the lead screw groove 11 form a channel for the central bellows cover 7 to extend and retract. The side walls of the opening of the lead screw groove 11 are recessed to form bellows cover grooves 15. Limit blocks 16 are fixed to the side walls at both ends of the lead screw groove 11 to block the axial limit position of the corresponding inverted T-shaped anti-chip slider and prevent the slider from overtravel and causing the threaded pair to disengage. The top of the base plate 1 has a dovetail guide groove 12. The nut groove 13 and the dovetail guide groove 12 slide and engage with the guide blocks at the bottom of the first slider 21 and the second slider 22, respectively, restricting the slider to move only along the direction of the dovetail guide groove 12, avoiding slider offset, ensuring that the V-shaped positioning surface is always aligned with the axis of the part, and improving centering accuracy. The nut groove 13 is provided with a nut step 14 inside, which is used to abut and position with the end face of the 6T-type nut on the grinding machine worktable. The nut step 14 inside the nut groove 13 abuts with the end face of the 6T-type nut on the grinding machine worktable. The axial zero point setting can be completed in one positioning of the base plate. Repeated clamping does not require re-alignment, saving operation time.

[0031] The base plate 1 is fastened to the grinding machine worktable 6 by T-nuts. The upper surface of the base plate 1 is provided with a central bellows cover 7 and two side bellows covers 8, all of which are embedded in the bellows cover groove 15. The two ends of the central bellows cover 7 are respectively fixed to the bottom of the first slider 21 and the second slider 22. The two sliders are provided with receiving cavities at corresponding positions to receive the central bellows cover 7 when the sliders move towards each other. When the two sliders move away from each other, the central bellows cover 7 is pulled out and exposed to cover the middle opening of the lead screw groove 11. The fixed ends of the two side bellows covers 8 are fixed to the recessed grooves on the side wall of the base plate 1 by pressure plate screws, and the movable ends are fixed to the corresponding sliders. The outer end face of the slide extends and retracts synchronously with the movement of the slider; when the first slider 21 and the second slider 22 move synchronously towards each other, the central bellows cover 7 is pulled and retracted by the slider, and the movable ends of the two side bellows covers 8 extend with the movement of the slider. When the sliders move synchronously away from each other, the central bellows cover 7 extends and the side bellows covers 8 retract. The bellows cover is always embedded in the bellows cover groove 15 and extends and retracts synchronously with the movement of the slider, covering the opening of the lead screw groove 11. The upper surface of the bellows cover is flush with the top surface of the base plate 1, which not only ensures that the grinding wheel passes through without interference, but also prevents coolant and grinding debris from being outside the lead screw groove 11, extending the lead screw maintenance cycle and reducing maintenance costs.

[0032] Working principle: The base plate 1 is fastened to the grinding machine worktable 6 through the T-nut in the nut groove 13. At the same time, the nut step 14 in the nut groove 13 abuts against the end face of the T-nut for positioning, ensuring that the base plate 1 and the worktable do not wobble relative to each other and that the installation position is accurate; the central bellows cover 7 and the two side bellows covers 8 are installed and embedded into the bellows cover groove 15, and the extension and retraction are checked to ensure smoothness; according to the size of the part to be processed, the positioning mechanism 4 is adjusted: hold the gripping hole 46 of the support block 42, move the positioning base 41, and find the target position according to the scale bar 47; the toothed plate 43 of the positioning base 41 is inserted into the toothed groove 44 of the base plate 1 to fix the position of the positioning base 41 to limit the maximum travel of the slider and adapt to the length of the part; when unlocking the lead screw, the rotatable handle 34 is pulled outward axially, which drives the lead screw body 33 to pull the moving gear plate 54 through the connecting rod 56, pushing the moving gear plate 54 to compress the disc spring 53 and disengage from the fixed gear plate 55; Place the part to be processed into the V-shaped positioning surface, rotate the handle 34 to drive the lead screw body 33 to rotate, so that the two sliders move synchronously towards each other along the dovetail guide groove 12. The sliders first contact the part and automatically center and clamp, and finally the rear end face of the slider abuts the end face of the positioning base 41 to avoid over-clamping of the part. Release the handle 34, the disc spring 53 elastically resets, pushes the moving gear plate 54 to re-mesh with the fixed gear plate 55, the lead screw is locked, and the position of the slider is completely fixed. Start the grinding machine, and the tool grinds the part. During the processing, the central bellows cover 7 keeps covering the middle section of the lead screw groove 11 with the position of the slider, and the side bellows covers 8 cover both ends to prevent coolant and metal chips from entering the lead screw groove 11. After the processing is completed, pull the handle 34 axially again to unlock the locking mechanism 5. Rotate the handle 34 in the opposite direction, the lead screw body 33 drives the two sliders to move in opposite directions, the V-shaped positioning surface disengages from the part, the processed part is removed, and it is ready for the next processing.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0034] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for machining automotive parts on a grinding machine, comprising a base plate (1), characterized in that, Also includes: The V-shaped adjustment mechanism (2) includes a first slider (21) and a second slider (22) that are slidably disposed on the top surface of the base plate (1). The opposing inclined surfaces of the two sliders together form a V-shaped positioning surface. The bottom of the first slider (21) and the second slider (22) are respectively fixed with a first inverted T-shaped anti-chip slider (211) and a second inverted T-shaped anti-chip slider (221). The bidirectional lead screw mechanism (3) includes a lead screw body (33) rotatably disposed inside the base plate (1). The lead screw body (33) has a first threaded section and a second threaded section with opposite directions of rotation, and forms a helical pair with the first inverted T-shaped anti-chip slider (211) and the second inverted T-shaped anti-chip slider (221) respectively, so as to drive the two sliders to move synchronously towards or away from each other. One end of the lead screw body (33) extends outward and is fixedly connected to a throttle (34). The locking mechanism (5) includes a locking base (51) fixed to the side wall of the base plate (1). A fixed gear plate (55) is coaxially arranged on the side of the locking base (51). The fixed gear plate (55) remains stationary relative to the grinding machine bed in the use state and is coaxially arranged with the lead screw body (33). A movable gear plate (54) is meshed with the side of the fixed gear plate (55). A connecting rod (56) is fixedly connected to the inner cavity of the movable gear plate (54). The connecting rod (56) is fixedly connected to the smooth section of the lead screw body (33), so that the movable gear plate (54) and the lead screw body (33) rotate synchronously and can slide axially. A disc spring (53) is arranged between the movable gear plate (54) and the locking base (51). When the throttle (34) is pulled axially, the lead screw body (33) pulls the movable gear plate (54) through the connecting rod (56) to compress the disc spring (53) and disengage, thereby unlocking.

2. The positioning fixture for machining automotive parts using a grinding machine according to claim 1, characterized in that: The bidirectional lead screw mechanism (3) also includes a first bearing seat (31) and a second bearing seat (32) respectively fixed inside the base plate (1), and the lead screw body (33) is rotatably supported between the first bearing seat (31) and the second bearing seat (32).

3. The positioning fixture for machining automotive parts using a grinding machine according to claim 1, characterized in that: The locking mechanism (5) further includes a disc spring seat (52) fixed in the inner cavity of the locking base (51). A disc spring (53) is sleeved on the outer wall of the disc spring seat (52). A guide blind hole (57) is provided on the side of the moving gear plate (54). The guide blind hole (57) is slidably engaged with the disc spring seat (52). The inner wall of the guide blind hole (57) is fixedly connected to the connecting rod (56). The connecting rod (56) and the smooth rod section of the lead screw body (33) are both rotatable and axially slidably connected to the inside of the locking base (51).

4. The positioning fixture for machining automotive parts using a grinding machine according to claim 1, characterized in that: The top of the base plate (1) is provided with a positioning mechanism (4). The positioning mechanism (4) includes two independently adjustable positioning bases (41) disposed on the top surface of the base plate (1). Each positioning base (41) has two support blocks (42) fixedly connected to its side. The support blocks (42) have gripping holes (46) on their side. Each positioning base (41) has two toothed plates (43) at its bottom. The top surface of the base plate (1) has toothed grooves (44) that mesh with the toothed plates (43) to prevent the positioning base (41) from sliding along the centering direction of the slider.

5. The positioning fixture for machining automotive parts using a grinding machine according to claim 4, characterized in that: The positioning mechanism (4) also includes a scale bar (47) parallel to the side of the tooth groove (44). A rectangular through hole (45) penetrating the base plate (1) is opened on the bottom surface of the tooth groove (44). The rectangular through hole (45) corresponds to the position of the tooth plate (43). The two positioning bases (41) are respectively placed on the side away from the grinding tool of the first slider (21) and the second slider (22), and their end faces can abut against the rear end face of the slider to realize auxiliary positioning of the grinding station.

6. The positioning fixture for machining automotive parts on a grinding machine according to claim 1, characterized in that: The base plate (1) has a lead screw groove (11) inside. The first inverted T-shaped anti-chip slider (211) and the second inverted T-shaped anti-chip slider (221) are both placed in the lead screw groove (11) and supported by its bottom surface. The two side walls of the opening of the lead screw groove (11) are sunken to form a bellows cover groove (15). Each side wall of the two ends of the lead screw groove (11) is fixed with a limit block (16) to block the axial limit position of the corresponding inverted T-shaped anti-chip slider. The top of the base plate (1) has a dovetail guide groove (12) and a nut groove (13). The dovetail guide groove (12) slides with the guide block at the bottom of the first slider (21) and the second slider (22) respectively. The nut groove (13) has a nut step (14) inside, which is used to abut and position with the T-shaped nut end face of the grinding table (6).

7. The positioning fixture for machining automotive parts using a grinding machine according to claim 1, characterized in that: The base plate (1) is fastened to the grinding machine worktable (6) by T-nuts. The upper surface of the base plate (1) is provided with a central accordion cover (7) and two side accordion covers (8), all of which are embedded in the accordion cover groove (15). The two ends of the central accordion cover (7) are respectively fixed to the bottom of the first slider (21) and the second slider (22). The two sliders are provided with receiving cavities at corresponding positions to receive the central accordion cover (7) when the sliders move towards each other. When the two sliders move away from each other, the central accordion cover (7) is pulled out and exposed to cover the middle opening of the screw groove (11). The fixed ends of the two side accordion covers (8) are fixed to the side wall recess of the base plate (1) by pressure plate screws, and the movable ends are fixed to the outer end face of the corresponding sliders, and extend and retract synchronously with the movement of the sliders.

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