Two-hole positioning finishing fixture

Abstract

The utility model discloses a two hole positioning finish clamping fixture, including base, two positioning pin and fixed assembly, the positioning pin includes pin shaft and pin sleeve, the pin shaft is connected on the base, the pin sleeve can be dismantled and is connected on the pin shaft, the pin sleeve is compatible with the positioning hole on the part, the fixed assembly is located on the pin sleeve, the fixed assembly is used for fixing the part to make the part resist to the base, the utility model has the beneficial effect that: the pin shaft can be long -term reuse, only need according to the hole diameter processing corresponding pin sleeve of the positioning hole on the part, when replacing the pin sleeve, do not need to disassemble the base and pin shaft, have reduced production cost.

Description

Technical Field

[0001] This utility model relates to the field of precision manufacturing, specifically to a two-hole positioning precision machining fixture. Background Technology

[0002] In the field of precision manufacturing, a large number of parts need to be calibrated by two-hole positioning. That is, by using two pre-set positioning holes on the part, the part is fixed on the fixture to ensure the relative positional accuracy of the machining tool and the surface to be machined, and ultimately ensure the assembly performance and reliability of the part.

[0003] Chinese utility model patent CN207873710U discloses a two-hole positioning precision machining fixture, including a clamping platform and a workpiece to be processed. A clamping plate is fixedly provided on the top of the clamping platform, and a first screw is screwed onto the clamping plate. The positioning nut at the left end of the first screw is close to the left side of the clamping plate. The other end of the first screw is inserted through a through hole in the clamping plate and the workpiece to be processed, and the first screw extends out of the right side of the workpiece to be processed. A positioning fixture is provided on the right side of the workpiece to be processed, and the positioning fixture has a positioning hole. The first screw is inserted into the inside of the positioning hole, and a second screw is also inserted into the positioning hole. The second screw passes through another through hole in the workpiece to be processed, and the second screw extends out of the left side of the workpiece to be processed.

[0004] The aforementioned technologies have the following drawbacks: the diameters of the first and second screws are fixed, and for parts with different positioning hole diameters, it is necessary to customize corresponding special fixtures, which results in high costs. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a two-hole positioning precision machining fixture to solve the technical problem that parts with different hole diameters need to use corresponding special fixtures in the prior art.

[0006] To achieve the above technical objectives, the present invention provides a two-hole positioning precision machining fixture, comprising a base, two positioning pins, and a fixing component. The positioning pin includes a pin shaft and a pin sleeve. The pin shaft is connected to the base, and the pin sleeve is detachably connected to the pin shaft. The pin sleeve is adapted to the positioning hole on the part. The fixing component is disposed on the pin sleeve and is used to fix the part so that the part is pressed against the base.

[0007] In some embodiments, the pin sleeve is threaded onto the pin shaft.

[0008] In some embodiments, the positioning pin further includes an anti-loosening ring, which is threaded onto the pin shaft. The anti-loosening ring has a first anti-loosening tooth, and the pin sleeve has a second anti-loosening tooth. The first anti-loosening tooth and the second anti-loosening tooth mesh with each other.

[0009] In some embodiments, the fixing component includes a pneumatic locking ring detachably connected to the pin sleeve, the pneumatic locking ring being connected to an air source, and the pneumatic locking ring abutting against the part.

[0010] In some embodiments, the pneumatic locking ring includes a skeleton and a flexible bladder, the skeleton being detachably connected to a pin sleeve, the flexible bladder being connected to the skeleton, and the skeleton having ventilation holes.

[0011] In some embodiments, the frame is provided with a positioning block, the pin sleeve is provided with a positioning groove for accommodating the positioning block, the pin sleeve is provided with a first insertion hole, the positioning block is provided with a second insertion hole, and a plug rod is inserted into the first insertion hole and the second insertion hole.

[0012] In some embodiments, the fixture further includes a guide rail, an adjustment component, and two sliders. The guide rail is disposed on the base, the two sliders are slidably connected to the guide rail, the two pins are respectively connected to the two sliders, and the adjustment component is used to adjust the distance between the two pins.

[0013] In some embodiments, the adjustment assembly includes a motor and a double-ended lead screw. The motor is mounted on a base, and the double-ended lead screw is rotatably connected to a guide rail. The double-ended lead screw extends along the length of the guide rail, and the output shaft of the motor is connected to the end of the double-ended lead screw. Two sliders are respectively inserted into both ends of the double-ended lead screw and are threadedly connected to the two sliders.

[0014] Compared with the prior art, the advantages of this utility model include: the pin can be reused for a long time, and only the corresponding pin sleeve needs to be processed according to the hole diameter of the positioning hole on the part. When replacing the pin sleeve, there is no need to disassemble the base and the pin, which reduces the production cost. Attached Figure Description

[0015] Figure 1 This is a first-view overall structural cross-sectional view of the clamp provided by this utility model; Figure 2 This utility model provides Figure 1 Enlarged view of the local structure at point A; Figure 3 This is a second-view overall structural diagram of the clamp provided by this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. Base; 2. Positioning pin; 21. Pin shaft; 22. Pin sleeve; 23. Anti-loosening ring; 231. First anti-loosening tooth; 232. Second anti-loosening tooth; 3. Fixing assembly; 31. Pneumatic locking ring; 311. Frame; 312. Flexible bladder; 313. Vent hole; 314. Positioning block; 315. Positioning groove; 316. First insertion hole; 317. Second insertion hole; 318. Insert rod; 4. Part; 41. Positioning hole; 5. Guide rail; 6. Adjustment assembly; 61. Motor; 62. Double-ended lead screw; 63. Support block; 7. Slider. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0018] This utility model provides a two-hole positioning precision machining fixture, the structure of which is as follows: Figure 1 - Figure 3 As shown, the device includes a base 1, two positioning pins 2, and a fixing component 3. Each positioning pin 2 includes a pin shaft 21 and a pin sleeve 22. The pin shaft 21 is connected to the base 1, and the pin sleeve 22 is detachably connected to the pin shaft 21. The pin sleeve 22 is adapted to the positioning hole 41 on the part 4. The fixing component 3 is disposed on the pin sleeve 22 and is used to fix the part 4 so that the part 4 is pressed against the base 1.

[0019] In use, for different hole diameters of the positioning holes 41 of part 4, select a pin sleeve 22 that precisely matches the hole diameter of the positioning hole 41. The inner diameter of the pin sleeve 22 transitions with the outer diameter of the pin 21 fixed on the base 1, and the outer diameter is machined according to the specifications of the positioning hole 41 of part 4. Insert the selected pin sleeve 22 axially into the pin 21 to complete the hole diameter matching of the positioning component. Align the two positioning holes 41 of part 4 with the two positioning pins 2 with the pin sleeve 22 already fitted, and place part 4 downward along the axial direction of the pin sleeve 22. The outer wall of the pin sleeve 22 fits tightly with the inner wall of the positioning hole 41. Through the fitting accuracy between the pin sleeve 22 and the positioning hole 41, the horizontal movement and rotation of part 4 are restricted, ensuring that the relative position of the surface to be machined of part 4 and the base 1 meets the machining reference requirements. After part 4 is positioned, activate the fixing component 3 on the pin sleeve 22. The fixing component 3 applies axial pressure to the end face of part 4, making part 4 tightly press against the base 1, ensuring that the positioning accuracy is not affected by the fixing action.

[0020] In this invention, the pin 21 can be reused for a long time. Only the corresponding pin sleeve 22 needs to be machined according to the hole diameter of the positioning hole 41 on the part 4. When replacing the pin sleeve 22, there is no need to disassemble the base 1 and the pin 21, which reduces the production cost.

[0021] To improve the ease of disassembly and assembly of pin 22, please refer to... Figure 1 In a preferred embodiment, the pin sleeve 22 is threaded onto the pin shaft 21.

[0022] In use, the threaded connection allows for the installation and removal of the pin sleeve 22 by rotation. Only a wrench is needed to rotate the pin sleeve 22, which improves efficiency. At the same time, the threaded connection avoids the hard compression of the interference fit, reduces the wear rate of the mating surfaces of the pin shaft 21 and the pin sleeve 22, and extends the service life.

[0023] To improve the stability of pin 22, please refer to... Figure 2 In a preferred embodiment, the positioning pin 2 further includes an anti-loosening ring 23, which is threaded onto the pin 21. The anti-loosening ring 23 has a first anti-loosening tooth 231, and the pin sleeve 22 has a second anti-loosening tooth 232. The first anti-loosening tooth 231 and the second anti-loosening tooth 232 mesh with each other. The first anti-loosening tooth 231 and the second anti-loosening tooth 232 have a conical sawtooth structure. The anti-loosening teeth are continuously distributed along the circumferential direction of the anti-loosening ring 23 and the pin sleeve 22 to form an annular tooth ring. The first anti-loosening tooth 231 is located on the end face of the anti-loosening ring 23 facing the pin sleeve 22, and the second anti-loosening tooth 232 is located on the end face of the pin sleeve 22 facing the anti-loosening ring 23.

[0024] In use, the first anti-loosening tooth 231 of the anti-loosening ring 23 and the second anti-loosening tooth 232 of the pin sleeve 22 adopt a triangular tooth design, and an interference fit is formed between the teeth when they mesh. This meshing structure can generate a dual locking force in the radial and axial directions. When the pin sleeve 22 tends to loosen due to vibration, the meshing teeth will form a mechanical block, reducing the possibility of the pin sleeve 22 loosening.

[0025] To secure part 4 firmly against base 1, please refer to... Figure 3 In a preferred embodiment, the fixing component 3 includes a pneumatic locking ring, which is detachably connected to the pin sleeve 22, is connected to an air source, and abuts against the part 4.

[0026] During use, the working surface of the locking ring that contacts part 4 is made of polyurethane material, which can produce slight elastic deformation during the clamping process. This allows it to fit tightly against the end face of part 4 while avoiding surface scratches caused by hard contact. For precision parts 4 with a coating, this effectively protects the integrity of the coating and reduces the cost of scrapping part 4.

[0027] To improve the machining accuracy of part 4, please refer to... Figure 2In a preferred embodiment, the pneumatic locking ring includes a skeleton 311 and a flexible bladder 312. The skeleton 311 is detachably connected to the pin sleeve 22, and the flexible bladder 312 is connected to the skeleton 311. The skeleton 311 adopts a multi-layer structure, and the multi-layer structure is arranged and connected at intervals along the axis of the pin sleeve 22 to facilitate better support for the flexible bladder 312. The skeleton 311 is provided with ventilation holes 313.

[0028] In use, the skeleton 311 is made of steel in a ring structure, and its inner diameter is fitted with the pin sleeve 22 with clearance. Compared with a purely elastic locking ring without a skeleton 311, the skeleton 311 can restrict the radial expansion direction when the flexible bladder 312 is inflated, reduce the deviation between the central axis of the locking ring and the axis of the pin sleeve 22, ensure that the clamping force is symmetrically distributed along the axis of the positioning hole 41 of the part 4, and avoid the tilting of the part 4 due to offset.

[0029] To install the frame 311 and the pin 21, please refer to... Figure 2 In a preferred embodiment, the frame 311 is provided with a positioning block 314, the pin sleeve 22 is provided with a positioning groove 315 for accommodating the positioning block 314, the pin sleeve 22 is provided with a first insertion hole 316, the positioning block 314 is provided with a second insertion hole 317, and an insertion rod 318 is inserted into the first insertion hole 316 and the second insertion hole 317.

[0030] In use, three positioning blocks 314 are evenly distributed around the bottom of the frame 311, and three positioning grooves 315 are opened on the outer wall of the pin sleeve 22 at corresponding positions. When installing the frame 311, the three positioning blocks 314 of the frame 311 are aligned with the three positioning grooves 315 of the pin sleeve 22 and slid downward along the axial direction. The positioning blocks 314 contact the guide surfaces of the positioning grooves 315. Through three-point symmetrical constraint, the circumferential rotation and radial offset of the frame 311 relative to the pin sleeve 22 are restricted, so that the second insertion hole 317 on the frame 311 is automatically aligned with the first insertion hole 316 on the pin sleeve 22. The insertion rod 318 is inserted into the two holes along the axial direction. The insertion rod 318, through precise fit, simultaneously constrains the axial displacement and radial swing of the positioning blocks 314 and the positioning grooves 315, so that the frame 311 and the pin sleeve 22 form a rigid whole.

[0031] To accommodate parts 4 with different hole spacings, please refer to... Figure 2 In a preferred embodiment, the clamp further includes a guide rail 5, an adjustment component 6, and two sliders 7. The guide rail 5 is disposed on the base 1, the two sliders 7 are slidably connected to the guide rail 5, the two pins 21 are respectively connected to the two sliders 7, and the adjustment component 6 is used to adjust the distance between the two pin sleeves 22.

[0032] In use, the guide rail 5 is a linear guide rail 5, and the slider 7 is clearance-fitted with the guide rail 5. The two sliders 7 can slide freely along the guide rail 5, driving the pin 21 and the pin sleeve 22 to adjust the hole spacing. Compared with traditional fixed hole spacing fixtures, there is no need to customize special fixtures for different hole spacings, thus reducing costs.

[0033] To adjust the distance between the two sliders 7, please refer to... Figure 1 In a preferred embodiment, the adjustment assembly 6 includes a motor 61, a double-ended lead screw 62, and a support block 63. The motor 61 is mounted on the base 1, the support block 63 is fixedly connected to the guide rail 5, the double-ended lead screw 62 is rotatably connected to the support block 63, the double-ended lead screw 62 is parallel to the guide rail 5, the output shaft of the motor 61 is connected to the end of the double-ended lead screw 62, and two sliders 7 are respectively inserted into both ends of the double-ended lead screw 62 and threadedly connected to the two sliders 7.

[0034] In use, the motor 61 is fixed to the motor 61 mounting base of the base 1 by bolts, and its output shaft is rigidly connected to one end of the double-ended lead screw 62 via a coupling. If the motor 61 drives the lead screw to rotate clockwise, the right-hand thread on the left end drives the left slider 7 to move to the right along the guide rail 5, and the left-hand thread on the right end drives the right slider 7 to move to the left along the guide rail 5. The two sliders 7 move closer to each other, and the gap between the pin sleeves 22 decreases. If the motor 61 drives the lead screw to rotate counterclockwise, the left slider 7 moves to the left and the right slider 7 moves to the right. The two sliders 7 move further apart, and the gap between the pin sleeves 22 increases, thus achieving efficient and precise adjustment of the gap between the pin sleeves 22.

[0035] To better understand this utility model, the following is combined with... Figure 1 - Figure 3 The working principle of a two-hole positioning precision machining fixture of this utility model is described in detail: For positioning holes 41 of parts 4 with different hole diameters, a pin sleeve 22 that is precisely matched with the hole diameter of the positioning hole 41 is selected. The inner diameter of the pin sleeve 22 is transitionally fitted with the outer diameter of the pin shaft 21 fixed on the base 1. The outer diameter is machined according to the specifications of the positioning hole 41 of parts 4. The selected pin sleeve 22 is inserted axially into the pin shaft 21 to complete the hole diameter adaptation of the positioning component. The two positioning holes 41 of part 4 are aligned with the two positioning pins 2 with pin sleeve 22 already in place. Part 4 is placed downward along the axial direction of pin sleeve 22. The outer wall of pin sleeve 22 is tightly fitted with the inner wall of positioning hole 41. Through the fitting accuracy between pin sleeve 22 and positioning hole 41, the movement and rotation of part 4 in the horizontal direction are restricted, ensuring that the relative position of the surface to be processed of part 4 and base 1 meets the processing reference requirements. After part 4 is positioned, the fixing component 3 on pin sleeve 22 is activated. The fixing component 3 applies axial pressure to the end face of part 4, so that part 4 is tightly pressed against base 1, ensuring that the positioning accuracy is not affected by the fixing action.

[0036] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A two-hole positioning and finishing fixture, characterized in that, include: The component comprises a base, two positioning pins, and a fixing component. Each positioning pin includes a pin shaft and a pin sleeve. The pin shaft is connected to the base, and the pin sleeve is detachably connected to the pin shaft. The pin sleeve is adapted to a positioning hole on the part. The fixing component is located on the pin sleeve and is used to fix the part so that the part is pressed against the base.

2. The two-hole positioning and finishing fixture according to claim 1, characterized in that, The pin sleeve is threaded onto the pin shaft.

3. The two-hole positioning and finishing fixture according to claim 1, characterized in that, The positioning pin also includes an anti-loosening ring, which is threaded onto the pin shaft. The anti-loosening ring has a first anti-loosening tooth, and the pin sleeve has a second anti-loosening tooth. The first anti-loosening tooth and the second anti-loosening tooth mesh with each other.

4. A two-hole positioning and finishing fixture according to claim 1, characterized in that, The fixing component includes a pneumatic locking ring, which is detachably connected to the pin sleeve. The pneumatic locking ring is connected to an air source and abuts against the part.

5. A two-hole positioning and finishing fixture according to claim 4, characterized in that, The pneumatic locking ring includes a skeleton and a flexible bladder. The skeleton is detachably connected to the pin sleeve, and the flexible bladder is connected to the skeleton. The skeleton is provided with vent holes.

6. A two-hole positioning and finishing fixture according to claim 5, characterized in that, The frame is provided with a positioning block, the pin sleeve is provided with a positioning groove for accommodating the positioning block, the pin sleeve is provided with a first insertion hole, the positioning block is provided with a second insertion hole, and a plug rod is inserted into the first insertion hole and the second insertion hole.

7. A two-hole positioning and finishing fixture according to claim 1, characterized in that, The fixture also includes a guide rail, an adjustment component, and two sliders. The guide rail is mounted on the base, the two sliders are slidably connected to the guide rail, and the two pins are respectively connected to the two sliders. The adjustment component is used to adjust the distance between the two pins.

8. A two-hole positioning and finishing fixture according to claim 7, characterized in that, The adjustment assembly includes a motor and a double-ended lead screw. The motor is mounted on the base, and the double-ended lead screw is rotatably connected to the guide rail. The double-ended lead screw extends along the length of the guide rail, and the output shaft of the motor is connected to the end of the double-ended lead screw. Two sliders are respectively inserted into the two ends of the double-ended lead screw and are threadedly connected to the two sliders.

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