Positioning clamp for high-precision automobile control rod production and using method thereof

Abstract

The invention discloses a high-precision positioning clamp for automobile control rod production and a using method thereof. The high-precision positioning clamp comprises a placing plate, and two sets of moving plates are arranged on the placing plate; a fixed plate is arranged on the movable plate, a plurality of groups of positioning screw rods are uniformly arranged on the fixed plate, positioning blocks are arranged on the positioning screw rods, a limiting plate is further arranged on the movable plate, the limiting plate is matched with the positioning screw rods, so that the distance between the positioning blocks and the fixed plate is fixed, and a driving assembly is arranged at the bottom end of the placing plate. The device has the beneficial effects that the two sets of moving plates are driven by the driving assembly to synchronously move towards the automobile control rod part on the placing plate, so that at least one set of positioning blocks preliminarily make contact with the part; and then, the multiple sets of positioning screws are independently adjusted through threaded fit of the positioning screws and the fixing plate, the positioning blocks are driven to conduct fine adjustment displacement till the positioning blocks make full contact with the surface of the part, the profiling process is completed, and multi-point self-adaptive positioning is achieved in the process.

Description

Technical Field

[0001] The invention relates to a positioning fixture for producing a high-precision automobile control rod and a use method thereof. Background Art

[0002] In the automotive industry, control levers (such as shift levers and steering rods) are key transmission components, and their machining accuracy directly impacts the vehicle's handling and safety. As vehicles become increasingly lightweight and high-performance, control lever structures are becoming increasingly complex, often exhibiting irregular curved surfaces or asymmetrical contours. This places stringent demands on the positioning fixtures used during production.

[0003] At present, the positioning fixture for processing automobile control levers needs to be customized according to the specific part shape. Although it can ensure positioning accuracy, it lacks flexibility. Once the part design changes or needs to be compatible with different models, the fixture must be redesigned and manufactured, resulting in high costs and long changeover cycles. It is difficult to adapt to the needs of multi-variety and small-batch production. In view of this, the present invention proposes a positioning fixture for the production of high-precision automobile control levers and a method of using the same to solve the above problems. Summary of the Invention

[0004] The object of the present invention is to provide a positioning fixture for producing a high-precision automobile control rod and a method of using the same, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A positioning fixture for producing high-precision automobile control rods, comprising a placement plate, on which two sets of movable plates are arranged; A fixed plate is provided on the movable plate, and a plurality of groups of positioning screws are evenly arranged on the fixed plate. A positioning block is provided on the positioning screw. A limiting plate is also provided on the movable plate. The limiting plate cooperates with the positioning screw to fix the distance between the positioning block and the fixed plate. A driving assembly is provided at the bottom end of the placement plate. The driving assembly cooperates with the movable plate to make the positioning block move toward the middle of the placement plate to position the automobile control rod parts.

[0006] As an improvement of the above technical solution, the driving assembly includes two groups of driving rods, and the two groups of driving rods are symmetrically arranged at the bottom end of the placement plate; The driving rod is provided with two groups of threaded outer walls with opposite thread directions, and both groups of threaded outer walls are provided with threaded sleeves with threaded connections, and the threaded sleeves are provided with connecting plates. The two ends of the movable plate are respectively connected to the connecting plates with matching positions, so that the two groups of movable plates are symmetrically arranged on the placement plate.

[0007] As an improvement to the above technical solution, driving plates are provided at both ends of the driving rod, and two groups of the driving plates are connected to the placement plate; A transmission rod is provided on the driving plate, a driving hand wheel is provided on the transmission rod, and the transmission rod is in transmission connection with the driving rod.

[0008] As an improvement to the above technical solution, the fixing plate is evenly provided with a plurality of groups of positioning threaded holes, and the plurality of groups of positioning screws are respectively threadedly connected to the plurality of groups of positioning threaded holes; The fixed plate is fixedly connected to the movable plate, and the limiting plate is slidably connected to the movable plate.

[0009] As an improvement of the above technical solution, the positioning block is rotatably arranged on the positioning screw, the positioning block is made of rubber material, and a positioning handwheel is arranged on the positioning screw.

[0010] As an improvement to the above technical solution, a limiting tube is provided at the positioning threaded hole, and the limiting tube is communicated with the positioning threaded hole; The limiting plate is evenly provided with a plurality of groups of limiting holes, and the plurality of groups of limiting tubes are respectively arranged in the plurality of groups of limiting holes.

[0011] As an improvement to the above technical solution, the limiting tube is provided with a tapered surface, and the diameter of the limiting hole is the same as the minimum diameter of the tapered surface; The limiting tube is provided with a plurality of deformation grooves, so that the limiting tube is divided into a plurality of limiting blocks. The limiting plate slides on the movable plate, so that the limiting blocks shrink inwardly and wrap around the outer wall of the positioning screw.

[0012] As an improvement of the above technical solution, a toggle plate is provided on the limit plate, and the toggle plate is fixedly connected to the limit plate.

[0013] A method for using a positioning fixture for producing high-precision automobile control rods comprises the following steps: (S1) placing the automobile control lever parts on a placement plate; (S2) rotating the driving hand wheel to drive the two sets of driving rods to rotate synchronously through the transmission rods, and the opposite threads on the driving rods drive the two sets of threaded sleeves and the connecting plates connected thereto to move synchronously toward each other, thereby driving the two sets of moving plates to move synchronously toward the vehicle control rod component until at least one set of positioning blocks contacts the surface of the vehicle control rod component; (S3) independently rotating the positioning handwheel on each positioning screw to move each positioning screw axially in the positioning threaded hole of the fixing plate, thereby driving the positioning block to fine-tune the displacement until all positioning blocks are in close contact with the surface contour of the automobile control rod part, thereby completing the contour positioning; (S4) driving the limit plate to slide so that the limit hole on the limit plate is sleeved on the conical surface of the limit tube; during the sliding process, the wall of the limit hole exerts radial pressure on the conical surface, forcing the limit blocks formed by the limit tube to elastically deform along the deformation groove and shrink inward, synchronously holding the outer walls of all the positioning screws, thereby fixing the distance between all the positioning blocks and the fixed plate; (S5) The driving hand wheel is rotated again to drive the two sets of movable plates to further move toward each other synchronously, so that all positioning blocks apply force evenly to the surface of the part, completing the final high-precision clamping and positioning of the part.

[0014] As an improvement of the above technical solution, the operation of the sliding limit plate in step (S4) is specifically as follows: by toggling the toggle plate with a single action, the limit plate is driven to translate along the movable plate. The translation action simultaneously drives all the limit blocks to undergo elastic deformation and hold the corresponding positioning screws, thereby realizing synchronous rigid locking of all positioning screws.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The drive assembly drives two sets of moving plates to synchronously move toward the automotive control lever part on the placement plate, ensuring that at least one set of positioning blocks initially contacts the part. Subsequently, the positioning screws, threaded with the fixed plate, are independently adjusted to fine-tune the positioning blocks until they fully contact the part surface, completing the contouring process. This process achieves multi-point adaptive positioning, effectively adapting to the complex or irregular contours of automotive control lever parts, ensuring positioning accuracy meets high tolerance requirements, reducing positioning deviations caused by part shape variations, and thus improving product processing consistency. After the profiling process, the spacing between the positioning blocks and the fixed plate is fixed by the cooperation of the limiting plate and the positioning screw, forming a rigid lock. Subsequently, the movable plate is driven to move again, so that all the positioning blocks apply force evenly to the part surface. The locking mechanism of the limiting plate prevents the positioning screw from loosening or retreating during the clamping process, ensuring uniform distribution of positioning force, significantly improving the vibration resistance and long-term stability of the fixture, and reducing the risk of part displacement or deformation during production. The movable plate is driven to move by the movable plate. When multiple groups of automobile control rod parts are limited, the positions of the two groups of movable plates can be adjusted to repeat the positioning of the automobile control rod parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the bottom structure of the placement plate of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure at A in the middle; Figure 4 It is a structural schematic diagram of the fixing plate of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure at B in the middle; Figure 6 A schematic structural diagram of the fixing plate of the present invention from another angle; Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure at C in the middle; Figure 8 Schematic diagram of the structure of the limiting plate of the present invention; Figure 9 For the present invention Figure 8 Schematic diagram of the enlarged structure at D in the middle; Figure 10 It is a structural schematic diagram of the positioning screw of the present invention.

[0017] In the figure: 10, placement plate; 20, moving plate; 30, positioning screw; 31, positioning block; 32, positioning handwheel; 40, fixing plate; 41, positioning threaded hole; 50, driving assembly; 51, driving rod; 52, threaded outer wall; 53, threaded sleeve; 54, driving plate; 55, driving handwheel; 56, transmission rod; 57, connecting plate; 60, limiting tube; 61, tapered surface; 62, deformation groove; 63, limiting block; 70, limiting plate; 71, limiting hole; 72, toggle plate. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Example: like Figure 1-10 As shown, this embodiment proposes a positioning fixture for producing high-precision automobile control rods, including a placement plate 10, on which two sets of movable plates 20 are provided; A fixed plate 40 is provided on the movable plate 20, and a plurality of positioning screws 30 are evenly provided on the fixed plate 40. A positioning block 31 is provided on the positioning screw 30. A limiting plate 70 is also provided on the movable plate 20. The limiting plate 70 cooperates with the positioning screw 30 so that the distance between the positioning block 31 and the fixed plate 40 is fixed. A driving assembly 50 is provided at the bottom end of the placement plate 10. The driving assembly 50 cooperates with the movable plate 20 so that the positioning block 31 moves toward the middle of the placement plate 10 to position the automobile control rod parts.

[0020] In this embodiment, when it is necessary to perform a clamping and positioning process on the automobile control rod part, the automobile control rod part is first placed on the placement plate 10, and then the driving assembly 50 drives the two sets of movable plates 20 to move simultaneously toward the automobile control rod part until a set of positioning blocks 31 on the movable plate 20 contacts the automobile control rod part, and then the positioning screws 30 cooperate with the fixed plate 40 to make the multiple sets of positioning screws 30 move toward the automobile control rod part until the multiple sets of positioning blocks 31 contact the surface of the automobile control rod part, and then the multiple sets of positioning screws 30 are positioned by the limiting plate 70 so that the spacing between the positioning blocks 31 and the fixed plate 40 is fixed, and the profiling process is completed. When the automobile control rod part is further positioned, it is only necessary to drive the two sets of movable plates 20 to move again toward the automobile control rod part, so that the multiple sets of positioning blocks 31 all contact the surface of the automobile control rod part, and the clamping and positioning process of the automobile control rod part is completed; The drive assembly 50 drives the two sets of movable plates 20 to synchronously move toward the automobile control lever part on the placement plate 10, so that at least one set of positioning blocks 31 initially contacts the part. Subsequently, the positioning screws 30 and the fixed plate 40 are threaded together to independently adjust the multiple sets of positioning screws 30, driving the positioning blocks 31 to fine-tune their displacement until they fully contact the part surface, completing the profiling process. This process achieves multi-point adaptive positioning, effectively adapting to the complex or irregular contours of the automobile control lever part, ensuring positioning accuracy meets high tolerance requirements, reducing positioning deviations caused by part shape variations, and thus improving product processing consistency. After the profiling process, the spacing between the positioning blocks 31 and the fixed plate 40 is fixed by the cooperation of the limiting plate 70 and the positioning screw 30, forming a rigid lock. Subsequently, the movable plate 20 is driven to move again, so that all positioning blocks 31 apply force evenly to the part surface. The locking mechanism of the limiting plate 70 prevents the positioning screw 30 from loosening or retreating during the clamping process, ensuring uniform distribution of positioning force, significantly improving the vibration resistance and long-term stability of the clamp, and reducing the risk of part displacement or deformation during production. The movable plate 20 is driven to move by the movable plate 20 , and when a plurality of sets of automobile control rod parts are subjected to position limiting processing, the positions of the two sets of movable plates 20 can be adjusted to repeat the positioning processing of the automobile control rod parts.

[0021] Specifically, the driving assembly 50 includes two sets of driving rods 51, and the two sets of driving rods 51 are symmetrically arranged at the bottom end of the placement plate 10; The driving rod 51 is provided with two groups of threaded outer walls 52 with opposite thread directions, and both groups of threaded outer walls 52 are provided with threaded sleeves 53 with threaded connections, and the threaded sleeves 53 are provided with connecting plates 57. The two ends of the movable plate 20 are respectively connected to the connecting plates 57 with matching positions, so that the two groups of movable plates 20 are symmetrically arranged on the placement plate 10.

[0022] In this embodiment, two sets of driving rods 51 are symmetrically arranged at the bottom end of the placement plate 10, and each driving rod 51 is provided with two sets of threaded outer walls 52 with opposite thread directions, so that the threaded sleeves 53 threadedly connected to the two sets of threaded outer walls 52 can move in opposite directions along the axis of the driving rod 51; The threaded sleeve 53 is rigidly connected to both ends of the movable plate 20 through the connecting plate 57. When the driving rod 51 rotates, the two sets of threaded sleeves 53 are synchronously displaced toward or away from each other by the action of the reverse threads, thereby accurately driving the two sets of movable plates 20 to move symmetrically and synchronously toward or away from the placement plate 10. This structure eliminates the risk of unbalanced load or asynchronous displacement caused by unilateral drive, ensures that the parts of the automobile control rod are subjected to balanced force, and the positioning center coincides with the theoretical axis, thereby improving the positioning coaxiality accuracy.

[0023] Specifically, driving plates 54 are provided at both ends of the driving rod 51, and two sets of the driving plates 54 are connected to the placement plate 10; A transmission rod 56 is provided on the driving plate 54 , a driving hand wheel 55 is provided on the transmission rod 56 , and the transmission rod 56 is in transmission connection with the driving rod 51 .

[0024] In this embodiment, the driving hand wheel 55 can easily drive the transmission rod 56 to rotate, thereby easily driving the driving rod 51 to rotate, so as to control the displacement of the two groups of movable plates 20.

[0025] Specifically, the fixing plate 40 is evenly provided with a plurality of positioning threaded holes 41, and the plurality of positioning screws 30 are respectively threadedly connected to the plurality of positioning threaded holes 41; The fixed plate 40 is fixedly connected to the movable plate 20 , and the limiting plate 70 is slidably connected to the movable plate 20 .

[0026] In this embodiment, the positioning threaded hole 41 can facilitate adjustment of the positioning screw 30, thereby facilitating contact between the positioning block 31 on the positioning screw 30 and the surface of the vehicle control lever part, and completing the profiling process after multiple groups of positioning blocks 31 are in contact.

[0027] Specifically, the positioning block 31 is rotatably disposed on the positioning screw 30 . The positioning block 31 is made of rubber material. A positioning handwheel 32 is disposed on the positioning screw 30 .

[0028] In this embodiment, the positioning hand wheel 32 can easily drive the positioning screw 30 to rotate so that the positioning block 31 contacts the surface of the vehicle control lever part.

[0029] Specifically, a limiting tube 60 is provided at the positioning threaded hole 41 , and the limiting tube 60 is communicated with the positioning threaded hole 41 ; The limiting plate 70 is evenly provided with a plurality of limiting holes 71 , and the plurality of limiting tubes 60 are respectively disposed in the plurality of limiting holes 71 .

[0030] Specifically, the limiting tube 60 is provided with a tapered surface 61 , and the diameter of the limiting hole 71 is the same as the minimum diameter of the tapered surface 61 ; The limiting tube 60 is provided with a plurality of deformation grooves 62 , so that the limiting tube 60 is divided into a plurality of limiting blocks 63 . The limiting plate 70 slides on the movable plate 20 , so that the limiting blocks 63 shrink inwardly and wrap around the outer wall of the positioning screw 30 .

[0031] In this embodiment, when the limiting plate 70 slides, the wall surface of the limiting hole 71 forces the limiting block 63 having the tapered surface 61 to elastically contract radially inward, thereby tightly wrapping and holding the outer wall of the positioning screw 30. This structure achieves a rigid locking of the positioning screw 30, effectively preventing it from axial displacement or retreat due to vibration or external force during processing, and ensuring the long-term stability of the distance between the positioning block 31 and the fixing plate 40. A single movement of the sliding limit plate 70 can simultaneously drive the limit blocks 63 on all the limit tubes 60 to synchronously clamp the corresponding positioning screws 30. This design significantly simplifies the locking operation process, avoids the tedious steps of locking one by one, and greatly improves the operating efficiency of the clamp; The design of the limiting hole 71 with the same diameter as the minimum diameter of the tapered surface 61, combined with the elastic deformation space provided by the deformation groove 62, ensures that all limiting blocks 63 can be subjected to uniform radial pressure when sliding the limiting plate 70. This uniform force makes the locking force of all positioning screws 30 evenly distributed, thereby maintaining the completed contour positioning state to the greatest extent, providing reliable guarantee for high-precision processing.

[0032] Specifically, a toggle plate 72 is provided on the limiting plate 70 , and the toggle plate 72 is fixedly connected to the limiting plate 70 .

[0033] In this embodiment, the provided toggle plate 72 can facilitate the limiting plate 70 to slide on the movable plate 20 .

[0034] A method for using a positioning fixture for producing high-precision automobile control rods comprises the following steps: (S1) placing the automobile control lever part on the placement plate 10; (S2) rotating the driving hand wheel 55, driving the two sets of driving rods 51 to rotate synchronously through the transmission rod 56, and the opposite threads on the driving rods 51 drive the two sets of threaded sleeves 53 and the connecting plates 57 connected thereto to move synchronously toward each other, thereby driving the two sets of movable plates 20 to move synchronously toward the vehicle control lever component until at least one set of positioning blocks 31 contacts the surface of the vehicle control lever component; (S3) independently rotating the positioning handwheel 32 on each positioning screw 30 to cause each positioning screw 30 to move axially in the positioning threaded hole 41 of the fixing plate 40, thereby driving the positioning block 31 to fine-tune its displacement until all positioning blocks 31 are in close contact with the surface contour of the vehicle control rod part, thereby completing the contour positioning; (S4) The limiting plate 70 is driven to slide, so that the limiting hole 71 on the limiting plate 70 is sleeved on the tapered surface 61 of the limiting tube 60. During the sliding process, the wall of the limiting hole 71 exerts radial pressure on the tapered surface 61, forcing the limiting blocks 63 formed on the limiting tube 60 to elastically deform along the deformation groove 62 and contract inward, thereby simultaneously holding the outer walls of all the positioning screws 30, thereby fixing the distance between all the positioning blocks 31 and the fixing plate 40. (S5) The driving hand wheel 55 is rotated again to drive the two sets of movable plates 20 to further move toward each other synchronously, so that all the positioning blocks 31 apply force evenly to the surface of the part, completing the final high-precision clamping and positioning of the part.

[0035] Specifically, the operation of the sliding limit plate 70 in step (S4) is as follows: by toggling the toggle plate 72 with a single action, the limit plate 70 is driven to translate along the movable plate 20. The translation action simultaneously drives all the limit blocks 63 to undergo elastic deformation and hold the corresponding positioning screws 30, thereby realizing synchronous rigid locking of all the positioning screws 30.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for the production of high-precision automobile control rods, characterized by: It comprises a placement plate (10), on which two groups of movable plates (20) are arranged; The movable plate (20) is provided with a fixed plate (40), and a plurality of positioning screws (30) are evenly provided on the fixed plate (40), and a positioning block (31) is provided on the positioning screw (30). The movable plate (20) is also provided with a limiting plate (70), and the limiting plate (70) cooperates with the positioning screw (30) so that the spacing between the positioning block (31) and the fixed plate (40) is fixed. The bottom end of the placement plate (10) is provided with a driving assembly (50), and the driving assembly (50) cooperates with the movable plate (20) so that the positioning block (31) is displaced toward the middle of the placement plate (10) to position the automobile control rod parts.

2. A positioning fixture for producing high-precision automobile control rods according to claim 1, characterized in that: The driving assembly (50) includes two groups of driving rods (51), and the two groups of driving rods (51) are symmetrically arranged at the bottom end of the placement plate (10); The driving rod (51) is provided with two groups of threaded outer walls (52) with opposite thread directions, and the two groups of threaded outer walls (52) are both provided with threaded sleeves (53) connected by threads, and the threaded sleeves (53) are provided with connecting plates (57). The two ends of the movable plate (20) are respectively connected to the connecting plates (57) with matching positions, so that the two groups of movable plates (20) are symmetrically arranged on the placement plate (10).

3. The positioning fixture for producing high-precision automobile control rods according to claim 2, characterized in that: Driving plates (54) are provided at both ends of the driving rod (51), and two groups of the driving plates (54) are connected to the placement plate (10); A transmission rod (56) is provided on the driving plate (54), a driving hand wheel (55) is provided on the transmission rod (56), and the transmission rod (56) is in transmission connection with the driving rod (51).

4. The positioning fixture for producing high-precision automobile control rods according to claim 1, characterized in that: The fixing plate (40) is evenly provided with a plurality of positioning threaded holes (41), and the plurality of positioning screws (30) are respectively threadedly connected to the plurality of positioning threaded holes (41); The fixed plate (40) is fixedly connected to the movable plate (20), and the limiting plate (70) is slidably connected to the movable plate (20).

5. The positioning fixture for producing high-precision automobile control rods according to claim 4, characterized in that: The positioning block (31) is rotatably mounted on the positioning screw (30). The positioning block (31) is made of a rubber material. A positioning hand wheel (32) is mounted on the positioning screw (30).

6. The positioning fixture for producing high-precision automobile control rods according to claim 5, characterized in that: A limiting tube (60) is provided at the positioning threaded hole (41), and the limiting tube (60) is in communication with the positioning threaded hole (41); The limiting plate (70) is evenly provided with a plurality of groups of limiting holes (71), and the plurality of groups of limiting tubes (60) are respectively arranged in the plurality of groups of limiting holes (71).

7. The positioning fixture for producing high-precision automobile control rods according to claim 6, characterized in that: The limiting tube (60) is provided with a tapered surface (61), and the diameter of the limiting hole (71) is the same as the minimum diameter of the tapered surface (61); The limiting tube (60) is provided with a plurality of deformation grooves (62), so that the limiting tube (60) is divided into a plurality of limiting blocks (63). The limiting plate (70) slides on the movable plate (20), so that the limiting blocks (63) shrink inwardly and wrap around the outer wall of the positioning screw (30).

8. The positioning fixture for producing high-precision automobile control rods according to claim 7, characterized in that: A toggle plate (72) is provided on the limit plate (70), and the toggle plate (72) is fixedly connected to the limit plate (70).

9. A method for using a positioning fixture for producing a high-precision automobile control rod according to any one of claims 1 to 8, characterized in that: The following steps are involved: (S1) placing the automobile control lever parts on the placement plate (10); (S2) rotating the driving hand wheel (55) to drive the two sets of driving rods (51) to rotate synchronously through the transmission rod (56), and the reverse threads on the driving rods (51) drive the two sets of threaded sleeves (53) and the connecting plates (57) connected thereto to move synchronously toward each other, thereby driving the two sets of moving plates (20) to move synchronously toward the automobile control rod part until at least one set of positioning blocks (31) contacts the surface of the automobile control rod part; (S3) independently rotating the positioning hand wheel (32) on each positioning screw (30) to move each positioning screw (30) axially in the positioning threaded hole (41) of the fixing plate (40), driving the positioning block (31) to fine-tune the displacement until all the positioning blocks (31) are in close contact with the surface contour of the automobile control rod part, thereby completing the contour positioning; (S4) driving the limiting plate (70) to slide, so that the limiting hole (71) on the limiting plate (70) is sleeved on the conical surface (61) of the limiting tube (60); during the sliding process, the hole wall of the limiting hole (71) exerts radial pressure on the conical surface (61), forcing the limiting block (63) formed by segmentation on the limiting tube (60) to elastically deform along the deformation groove (62) and shrink inward, synchronously holding the outer walls of all the positioning screws (30), thereby fixing the distance between all the positioning blocks (31) and the fixing plate (40); (S5) The driving hand wheel (55) is rotated again to drive the two sets of movable plates (20) to further move synchronously toward each other, so that all the positioning blocks (31) apply force evenly to the surface of the part, thereby completing the final high-precision clamping and positioning of the part.

10. The method for using the positioning fixture for producing high-precision automobile control rods according to claim 9, characterized in that: The operation of the sliding limit plate (70) in step (S4) is specifically as follows: by toggling the toggle plate (72) in a single action, the limit plate (70) is driven to translate along the movable plate (20), and the translation action simultaneously drives all the limit blocks (63) to undergo elastic deformation and hold the corresponding positioning screws (30), thereby achieving synchronous rigid locking of all the positioning screws (30).

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