A positioning fixture for machining pin parts

Abstract

This utility model relates to the field of positioning tooling technology and discloses a positioning tooling for processing pin parts. It achieves stable clamping of the workpiece by setting up a clamping seat, slider, locking key, sleeve, and elastic clamping block. The slider moves synchronously with the sleeve. During movement, the locking key limits the movement of the elastic clamping blocks, ensuring the sleeve can only move vertically within the clamping seat. As the elastic clamping block slides downwards, the inner wall of the clamping seat presses against the outer wall of the elastic clamping block, causing it to gradually contract inwards. After the slider completes its travel, the elastic clamping block clamps the pin, completing the initial clamping action. Subsequently, the coil is energized, generating a magnetic field. Under the influence of the magnetic force, the magnetorheological fluid inside the liquid cavity rapidly changes from a liquid to a solid state. Through the deformation effect of the cavity shell, a uniform radial clamping force is applied to the pin, achieving a secondary stable clamping effect.

Description

Technical Field

[0001] This utility model relates to the field of positioning tooling technology, and in particular to a positioning tooling for processing pin parts. Background Technology

[0002] As core components in fields such as electronic connectors, medical devices, and aerospace, pins are typically characterized by their slender shape, precision, and large production volume. They have extremely high requirements for dimensional accuracy (such as diameter tolerance, straightness, and step coaxiality) and positional consistency. Therefore, positioning fixtures are necessary to ensure processing stability.

[0003] In the existing technology, traditional tooling fixtures mostly use rigid components such as positioning sleeves, which cannot dynamically compensate for the micro displacement of the pin caused by cutting forces during the machining process. In addition, the clamping force is unevenly distributed, and the clamping force of the elastic chuck or pneumatic pressure plate on the pin is concentrated in a local area, which can easily lead to bending of the rod. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a positioning fixture for processing pin parts, which has the advantages of two-stage clamping and easy disassembly, thus solving the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: a positioning fixture for processing pin parts, including a base frame, a slide rail on the top of the base frame, a motor fixedly mounted on one side of the base frame, the output shaft of the motor being driven by a screw shaft via a coupling, the screw shaft being rotatably mounted inside the slide rail, a slide bar being slidably mounted inside the slide rail on the outer ring of the screw shaft, the slide bar being threaded onto the outer ring of the screw shaft, a motor being fixedly mounted on the top side of the slide bar, and pads being evenly mounted in a linear array on the top side of the slide bar on the side of the motor, a clamping seat being fixedly mounted on the top of the pads, a housing being fixedly mounted on one side of the motor and the clamping seat, and a clamping sleeve being installed inside the clamping seat.

[0006] With the above structural design, and by setting up the cooperation between the clamp and the sleeve, stable two-stage clamping can be achieved, while also enabling quick sleeve replacement, making it convenient for users to replace sleeves of different diameters.

[0007] Preferably, a rotating shaft is rotatably mounted inside the clamp, and an eccentric block is provided at the end of the rotating shaft inside the clamp. Belts are connected to the rotating shaft near the motor and the output shaft of the motor, as well as to adjacent rotating shafts. The belts are located inside the housing.

[0008] With the above structural setup, after the motor starts, its output shaft drives the adjacent rotating shaft through a coupling and belt. The adjacent rotating shafts also drive each other through belts, thus achieving the effect of the motor driving multiple rotating shafts to rotate.

[0009] Preferably, a slider is slidably installed inside the clamp, the top of the slider has a threaded groove, the side of the slider near the rotating shaft has a retaining groove, the retaining groove is sized to match the eccentric block, the top of the slider has an evenly distributed annular electrode plate A, and the top of the clamp is fixedly installed with a retaining key.

[0010] With the above structural design, when the slot moves downward by the pressure of the eccentric block, the sleeve moves downward synchronously through the threaded connection between the slider and the sleeve. The position of the sleeve is restricted by the key, so it can only move straight up and down.

[0011] Preferably, the sleeve includes a screw head and elastic clamping blocks. The outer ring of the screw head is threaded to match the screw groove. The top of the screw head is uniformly provided with elastic clamping blocks in a circular shape. The gap between the elastic clamping blocks is adapted to the shape and size of the key end. The elastic clamping blocks are provided with a cavity shell near the middle. The cavity shell is made of silicone material. A liquid groove is formed between the inside of the cavity shell and the inside of the elastic clamping blocks.

[0012] With the above structural design, when the slider moves downward, the outer wall of the elastic clamping block comes into contact with the inner wall of the clamping seat. The inner wall of the clamping seat squeezes the outer wall of the elastic clamping block, causing the elastic clamping block to slowly move towards the center, thus achieving the effect of clamping the pins between the elastic clamping blocks.

[0013] Preferably, the liquid tank contains a magnetorheological fluid, a coil is fixedly installed inside the liquid tank, and electrode plates B are uniformly arranged in a circular shape at the bottom of the elastic clamp. The electrode plates B are electrically connected to the coil, and the electrode plates B and A are electrically connected to each other after contact.

[0014] With the above structural setup, in order to avoid the pin position shift caused by micro-vibrations during processing, the coil needs to be energized. After the coil is energized, it generates magnetism, and the magnetorheological fluid changes from liquid to solid in milliseconds. The flexible deformation of the cavity shell applies a uniform radial clamping force to the pin, achieving two-stage stable clamping.

[0015] This utility model has the following advantages: 1. This positioning fixture for machining the pin part achieves stable clamping of the workpiece by setting up a clamping seat, slider, locking key, sleeve, and elastic clamping block. The slider moves while driving the sleeve to move synchronously. When the sleeve moves, the locking key limits the movement between the elastic clamping blocks, so that the sleeve can only move vertically inside the clamping seat. As the elastic clamping block slides downward, the inner wall of the clamping seat squeezes the outer wall of the elastic clamping block, causing the elastic clamping block to gradually contract inward. After the slider completes its movement stroke, the elastic clamping block clamps the pin, completing the initial clamping action. Then, the coil is energized. After the coil is energized, a magnetic field is generated. The magnetorheological fluid inside the liquid cavity changes rapidly from a liquid state to a solid state under the influence of the magnetic force. Through the deformation effect of the cavity shell, a radial clamping force is uniformly applied to the pin, achieving a secondary stable clamping effect.

[0016] 2. The positioning fixture for machining the pin part achieves quick assembly and disassembly of the clamp by setting up structures such as sliders, locking keys, clamps, and screw heads. When it is necessary to change the clamp to a different size, the fixing parts of the locking key are disassembled using tools such as screwdrivers. After disassembly, the locking key is removed from the top of the clamp seat, so that the movement or rotation of the elastic clamp is no longer restricted by the locking key. At this time, the clamp is rotated by using tools to make the screw block seat located inside the screw groove for thread disassembly. After the screw block seat is freed from the restriction of the screw groove, the clamp is taken out upwards and replaced with a clamp of a different size for installation, achieving the effect of quick assembly and disassembly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the base frame of this utility model; Figure 3 This is a schematic diagram of the internal structure of the clamping seat of this utility model; Figure 4 This is an exploded view of the jacket structure of this utility model; Figure 5 This is a schematic diagram of the internal structure of the jacket of this utility model.

[0018] In the diagram: 1. Base frame; 11. Slide rail; 2. Motor; 21. Screw; 3. Slide bar; 31. Pad; 4. Motor; 5. Clamp; 51. Shaft; 52. Belt; 53. Slider; 54. Slot; 55. Electrode A; 56. Key; 6. Housing; 7. Jacket; 71. Screw head; 72. Elastic clamp; 73. Cavity; 74. Coil; 75. Electrode B. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1-2 A positioning fixture for processing pin parts includes a base frame 1. A slide rail 11 is provided on the top of the base frame 1. A motor 2 is fixedly installed on one side of the base frame 1. The output shaft of the motor 2 is connected to a screw shaft 21 through a coupling. The screw shaft 21 is rotatably installed inside the slide rail 11. A slide bar 3 is slidably installed inside the slide rail 11 on the outer ring of the screw shaft 21. The slide bar 3 is threaded onto the outer ring of the screw shaft 21. A motor 4 is fixedly installed on one side of the top of the slide bar 3. A pad 31 is evenly installed in a linear array on the top of the slide bar 3 on the side of the motor 4. A clamp 5 is fixedly installed on the top of the pad 31. A sleeve 6 is fixedly installed on one side of the motor 4 and the clamp 5. A clamping sleeve 7 is installed inside the clamp 5.

[0021] In practical applications, this device, through the cooperation of the clamping seat 5 and the clamping sleeve 7, achieves stable two-stage clamping while also enabling quick replacement of the clamping sleeve 7. This facilitates the user's replacement of clamping sleeves 7 with different diameters. During operation, the output shaft of the motor 4 drives the belt 52 to rotate via a coupling. The belt 52 transmits power to the rotating shaft 51, causing the shaft 51 to rotate inside the clamping seat 5. The rotation of the shaft 51 drives the eccentric block to rotate, which in turn presses against the slot 54, causing the slider 53 to be positioned within the clamping seat 5. When internal displacement occurs, the slider 53 drives the clamp 7 to move up or down inside the clamping seat 5. During the downward movement, the outer ring of the elastic clamp 72 follows the inner ring of the clamping seat 5 to clamp the needle between the elastic clamp 72, achieving a preliminary fixing effect. Before processing the needle, the coil 74 should be energized. After the coil 74 is energized, it generates a magnetic field, causing the magnetorheological fluid inside the liquid cavity to change from a liquid state to a solid state. The cavity shell 73 applies a uniform radial clamping force to the needle, which can achieve stable clamping of the needle and avoid stress concentration of the rigid clamp.

[0022] When the clip 7 needs to be replaced, the fixing parts of the key 56 are disassembled using a screwdriver or other tools. After disassembly, the key 56 is removed from the top of the clamp 5, so that the movement or rotation of the elastic clamp 72 is no longer restricted by the key 56. At this time, the clip 7 is rotated using a tool so that the screw head 71 is located inside the thread groove for thread removal. After the screw head 71 is removed from the thread groove, the clip 7 is taken out upwards and replaced with a clip 7 of a different size for installation, achieving the effect of quick disassembly and assembly.

[0023] Please seeFigures 1-4 A rotating shaft 51 is rotatably mounted inside the clamp 5. An eccentric block is provided at the end of the rotating shaft 51 inside the clamp 5. Belts 52 are connected to the rotating shaft 51 near the motor 4 and the output shaft of the motor 4, as well as to adjacent rotating shafts 51. The belts 52 are located inside the housing 6, which protects the belts 52. The output shaft of the motor 4 drives the adjacent rotating shaft 51 to rotate through the coupling and the belts 52. The rotating shafts 51 are driven to rotate through the belts 52, achieving the effect of a single motor 4 driving multiple belts 52 to rotate.

[0024] In actual use, the clamp 5 controls the position and clamping force of the clamp 7. After the motor 4 starts, its output shaft drives the adjacent rotating shaft 51 through the coupling and belt 52. The adjacent rotating shafts 51 are also driven by the belt 52, which achieves the effect of the motor 4 driving multiple rotating shafts 51 to rotate. When the rotating shaft 51 rotates, the eccentric block at its end rotates inside the slot 54, which drives the slider 53 to slide inside the clamp 5. When the slider 53 moves downward, the outer wall of the elastic clamp 72 contacts the inner wall of the clamp 5. The inner wall of the clamp 5 squeezes the outer wall of the elastic clamp 72, causing the elastic clamp 72 to slowly move towards the center, thus clamping the pin between the elastic clamps 72. When the slider 53 moves to the bottom of the stroke, the elastic clamps 72 clamp and fix the position of the pin, thus controlling the clamping force.

[0025] Please see Figures 1-4 The clamp 5 has a slider 53 slidably installed inside. The top of the slider 53 has a screw groove. The slider 53 has a slot 54 on the side near the rotating shaft 51. The slot 54 is sized to match the eccentric block. The top of the slider 53 has an electrode plate A55 evenly arranged in a circular shape. The top of the clamp 5 has a key 56 fixedly installed.

[0026] The slider 53 is electrically connected to the jacket 7 through the electrode plate A55, which serves to supply power to the jacket 7. The slider 53 and the jacket 7 are connected by threads. When the slot 54 moves downward by the extrusion of the eccentric block, the threaded connection between the slider 53 and the jacket 7 drives the jacket 7 to move downward synchronously. The position of the jacket 7 is restricted by the key 56, so it can only move straight up and down.

[0027] Please see Figures 1-5The sleeve 7 includes a screw head 71 and elastic clamping blocks 72. The sleeve 7 is composed of one screw head 71 and four elastic clamping blocks 72. The outer ring of the screw head 71 is threaded to match the screw groove. The top of the screw head 71 is uniformly provided with elastic clamping blocks 72 in a circular shape. The gap between the elastic clamping blocks 72 is adapted to the shape and size of the end of the retaining key 56. The retaining key 56 prevents the sleeve 7 from rotating inside the clamping seat 5 and restricts the position of the sleeve 7, so that the sleeve 7 can only move up and down inside the clamping seat 5. Near the middle of the elastic clamping block 72, there is a cavity shell 73. The cavity shell 73 is made of silicone material. A liquid groove is opened between the inside of the cavity shell 73 and the inside of the elastic clamping block 72.

[0028] When the sleeve 7 is driven by the slider 53 to slide downward inside the clamping seat 5, the outer wall of the elastic clamp 72 is attached to the inner wall of the clamping seat 5. The inner wall of the clamping seat 5 squeezes the outer wall of the elastic clamp 72, causing the elastic clamp 72 to gradually contract inward. After the movement of the sleeve 7 is completed, the elastic clamp 72 contracts to the state of clamping the needle, thus achieving the initial clamping effect on the needle.

[0029] Please see Figures 1-5 The liquid tank contains magnetorheological fluid, and a coil 74 is fixedly installed inside the liquid tank. The bottom of the elastic clamp 72 is uniformly provided with electrode plates B75 in a circular shape. The electrode plates B75 and the coil 74 are electrically connected to each other. After the electrode plates B75 and A55 come into contact, they are electrically connected to each other.

[0030] Before processing the insert, in order to avoid the micro-vibrations generated during processing causing the insert position to shift, the coil 74 needs to be energized. After the coil 74 is energized, it generates magnetism, and the magnetorheological fluid changes from liquid to solid in milliseconds. The flexible deformation of the cavity shell 73 applies a uniform radial clamping force to the insert, achieving two-stage stable clamping, while avoiding stress concentration in the rigid chuck.

[0031] The slider 3 has an internal power supply. The slider 3 supplies power to the clamp 5 through the connection between the pad 31 and the clamp 5. The clamp 5 is electrically connected to the electrode plate A55 and the electrode plate B75 to achieve the effect of power transmission. When needed, the power from the internal power supply of the slider 3 is transmitted to the inside of the coil 74 through the electrode plate A55 and the electrode plate B75, so that the coil 74 generates a magnetic field after being energized. Under the action of the magnetic field, the magnetorheological fluid can change from liquid to solid in milliseconds. The deformation of the cavity shell 73 can generate a uniform radial clamping force.

[0032] Working principle: During use, motor 2 is started, and the output shaft of motor 2 drives the screw shaft 21 to rotate through the coupling, causing the slide bar 3 to move inside the slide rail 11. After the slide bar 3 is moved to the position required by the user, the operation of the slide bar 3 is stopped. At this time, the pin is inserted into the inside of the clamp 7 by a robot or manually, so that the pin is positioned between the elastic clamps 72. After placement, motor 4 is started, and the output shaft of motor 4 drives the adjacent rotating shaft 51 to rotate through the coupling and belt 52. The adjacent rotating shafts 51 are transmitted through the belt 52, realizing the effect of motor 4 transmitting power to multiple rotating shafts 51. When the rotating shaft 51 rotates, the eccentric block at its end squeezes the slot 54, forcing the slider 53 to move downward. The slider 53 moves simultaneously, driving the clamp 7 to move synchronously. During movement, to prevent displacement in other directions or angles, the locking key 56 acts as a limiter during the sliding stroke of the sleeve 7. By limiting the elastic clamping blocks 72 with the locking key 56, the sleeve 7 can only move vertically inside the clamping seat 5. During the downward sliding process of the elastic clamping block 72, the inner wall of the clamping seat 5 squeezes the outer wall of the elastic clamping block 72, causing the elastic clamping block 72 to gradually contract inward. After the sliding block 53 has completed its movement stroke, the elastic clamping block 72 clamps the needle, completing the initial clamping action. Then, the coil 74 is energized. After the coil 74 is energized, it generates a magnetic field. Under the influence of the magnetic force, the magnetorheological fluid inside the liquid cavity quickly changes from a liquid state to a solid state. Through the deformation effect of the cavity shell 73, a radial clamping force is evenly applied to the needle, achieving a stable clamping effect while avoiding stress concentration in the rigid clamp. When it is necessary to replace the clip 7 of different sizes, the fixing part of the key 56 is disassembled by using a screwdriver or other tools. After disassembly, the key 56 is removed from the top of the clamp 5, so that the movement or rotation of the elastic clamp 72 is no longer restricted by the key 56. At this time, the clip 7 is rotated by using a tool so that the screw head 71 is located inside the screw groove for thread disassembly. After the screw head 71 is freed from the restriction of the screw groove, the clip 7 is taken out upward and replaced with a clip 7 of different sizes for installation, achieving the effect of quick disassembly and assembly.

Claims

1. A positioning fixture for machining pin parts, comprising a base frame (1), characterized in that: The top of the base frame (1) is provided with a slide rail (11). A motor (2) is fixedly installed on one side of the base frame (1). The output shaft of the motor (2) is connected to a screw shaft (21) through a coupling. The screw shaft (21) is rotatably installed inside the slide rail (11). A slide bar (3) is slidably installed inside the slide rail (11) on the outer ring of the screw shaft (21). The slide bar (3) is threaded onto the outer ring of the screw shaft (21). A motor (4) is fixedly installed on one side of the top of the slide bar (3). A pad (31) is evenly installed in a linear array on the top of the slide bar (3) on one side of the motor (4). A clamp (5) is fixedly installed on the top of the pad (31). A sleeve (6) is fixedly installed on one side of the motor (4) and the clamp (5). A sleeve (7) is installed inside the clamp (5).

2. The positioning fixture for machining pin parts according to claim 1, characterized in that: The clamp (5) is rotatably mounted inside. The end of the shaft (51) is provided with an eccentric block inside the clamp (5). The shaft (51) near the motor (4) is connected to the output shaft of the motor (4) and the adjacent shaft (51) by a belt (52). The belt (52) is located inside the housing (6).

3. The positioning fixture for machining pin parts according to claim 2, characterized in that: The clamp (5) has a slider (53) slidably installed inside. The top of the slider (53) has a screw groove. The slider (53) has a slot (54) on the side near the rotating shaft (51). The slot (54) is sized to match the eccentric block. The top of the slider (53) has an electrode plate A (55) evenly arranged in a circular shape. The top of the clamp (5) has a key (56) fixedly installed.

4. A positioning fixture for machining pin parts according to claim 3, characterized in that: The sleeve (7) includes a screw head (71) and an elastic clamp (72). The outer ring of the screw head (71) is threaded to match the screw groove. The top of the screw head (71) is uniformly provided with elastic clamps (72) in a circular shape. The gap between the elastic clamps (72) is adapted to the shape and size of the end of the key (56). The elastic clamp (72) is provided with a cavity shell (73) near the middle. The cavity shell (73) is made of silicone material. A liquid groove is opened between the inside of the cavity shell (73) and the inside of the elastic clamp (72).

5. A positioning fixture for machining pin parts according to claim 4, characterized in that: The liquid tank contains magnetorheological fluid, and a coil (74) is fixedly installed inside the liquid tank. The bottom of the elastic clamp (72) is uniformly provided with electrode plates B (75) in a circular shape. The electrode plates B (75) are electrically connected to the coil (74), and the electrode plates B (75) are electrically connected to each other after contacting the electrode plates A (55).

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