High-precision work fixture for repeatedly hoisting workpiece of numerical control boring machine

Abstract

The invention relates to a high-precision tool clamp for repeatedly hoisting a workpiece of a numerical control boring machine, and belongs to the technical field of boring machining.The high-precision tool clamp for repeatedly hoisting the workpiece of the numerical control boring machine comprises a tool base, a plurality of positioning bodies and a guide assembly, the tool base is used for being detachably installed on a boring machine workbench, and the guide assembly is arranged on the tool base; the positioning bodies are all arranged at the bottom of a workpiece, positioning holes used for being matched with the positioning bodies in an inserting and positioning mode are formed in the tool base, the positioning holes correspond to the positioning bodies in a one-to-one mode, guiding conical grooves are formed in the tool base, the guiding conical grooves correspond to the positioning holes in a one-to-one mode, the guiding conical grooves are formed in the circumferential direction of the corresponding positioning holes, and the guiding conical grooves correspond to the positioning holes in a one-to-one mode. The inner diameter of the guiding conical groove is gradually increased in the direction away from the bottom wall of the positioning hole, and the guiding assembly is arranged on the tool base and used for guiding a hoisted and descended workpiece. The method has the advantage of ensuring the positioning precision and the positioning efficiency.

Description

Technical Field

[0001] This application relates to the field of boring machining technology, and in particular to a high-precision tooling fixture for repeated lifting of workpieces on a CNC boring machine. Background Technology

[0002] Boring is a cutting process that uses a boring tool to enlarge the inner diameter of a pre-drilled hole on a workpiece. For workpieces weighing more than 50kg, when boring, it is usually necessary to use a hoisting device to lift the workpiece onto the tooling fixture on the boring machine's worktable, clamp and fix the workpiece in place, and then use the boring tool on the boring machine to process the workpiece.

[0003] In boring operations, repeated lifting of the workpiece is often involved when it is necessary to change the workpiece's machining surface or move the workpiece to fit the machining range of the CNC boring machine. The positioning accuracy of the workpiece and the tooling fixture during repeated lifting directly affects the machining quality. Currently, when repeatedly lifting the workpiece, the workpiece's wobbling causes a misalignment with the positioning surface of the tooling fixture, resulting in inaccurate positioning accuracy and low positioning efficiency. Summary of the Invention

[0004] To help ensure positioning accuracy and efficiency, this application provides a high-precision tooling fixture for repeated lifting of workpieces on a CNC boring machine.

[0005] The high-precision tooling fixture for repeated lifting of workpieces on a CNC boring machine provided in this application adopts the following technical solution: A high-precision tooling fixture for repeated workpiece hoisting on a CNC boring machine includes: Tooling base, the tooling base being detachably mounted on the boring machine worktable; The tooling base has multiple positioning bodies, each positioned at the bottom of the workpiece. Positioning holes are provided on the tooling base for insertion and positioning with the positioning bodies. Each positioning hole corresponds to one positioning body. A guide conical groove is provided on the tooling base, also corresponding to one positioning hole. The guide conical groove is circumferentially opened along the corresponding positioning hole, and its inner diameter increases in the direction away from the bottom wall of the positioning hole. A guide assembly, which is mounted on a tooling base, is used to guide the workpiece as it is hoisted and lowered.

[0006] Preferably, two positioning bodies are arranged opposite each other, one of which has a circular cross-section and the other has a rhomboid cross-section. The cross-section of the positioning hole is adapted to the cross-section of the corresponding positioning body, and the fitting gap between the positioning body and the corresponding positioning hole is less than or equal to 0.01 mm.

[0007] Preferably, the guiding assembly includes guide plates disposed opposite each other on the tooling base. The guide plates are detachably disposed on the tooling base. The guide plates have guiding portions that are inclined and the distance between two relative guiding portions decreases toward the tooling base.

[0008] Preferably, the length of the tooling base is less than the length of the workpiece, and air-floating supports are provided on opposite sides of the tooling base. The air-floating supports are used to support the thin-walled areas of the workpiece.

[0009] Preferably, the air flotation support includes a support rod and a support block. The support rod is mounted on a tooling base and has an air passage inside for communicating with an external air source. The support rod has multiple mounting slots, and the bottom wall of each mounting slot has multiple connecting holes that communicate with the air passages. The support block is mounted in the mounting slot and has multiple air outlets on it. Each air outlet corresponds to a connecting hole and is used to align or offset with the corresponding connecting hole.

[0010] Preferably, the air-bearing support is hinged to the tooling base, and the hinge axis of the air-bearing support is set in the vertical direction.

[0011] Preferably, the tooling fixture further includes a clamping assembly, which includes clamping blocks slidably disposed on opposite sides of the tooling base and a drive source disposed on the tooling base. The clamping blocks are used to slide toward or away from the workpiece to clamp or release the workpiece, and the drive source is used to drive the clamping blocks to slide.

[0012] Preferably, a positioning sleeve is slidably disposed in the tooling base along the vertical direction. The positioning sleeve corresponds one-to-one with the positioning hole. The positioning hole is opened on the corresponding positioning sleeve. The positioning sleeve is located in the corresponding guide cone groove. The tooling base is provided with an adjustment component for adjusting the positioning sleeve to slide towards or away from the workpiece. When the positioning body is outside the positioning hole, the top wall of the positioning sleeve is connected to the inner wall of the smaller diameter end of the corresponding guide cone groove.

[0013] Preferably, the adjustment assembly includes an adjustment body and a transmission component. The adjustment body corresponds one-to-one with the positioning sleeve. The adjustment body is located inside the corresponding positioning sleeve. The adjustment body is slidably disposed in the tooling base in the vertical direction. The adjustment body is used to abut against the corresponding positioning body. The transmission component is used to drive the positioning sleeve to slide when the adjustment body slides. When the adjustment body moves away from the workpiece, the transmission component drives the positioning sleeve to move closer to the workpiece.

[0014] Preferably, the transmission component includes a limiting cylinder, an isolation ring, and a spring. The limiting cylinder is disposed within the tooling base, and each limiting cylinder corresponds to a positioning sleeve. The isolation ring is disposed within the limiting cylinder, dividing the corresponding limiting cylinder into inner and outer cavities. The positioning sleeve slides into the outer cavity between the corresponding limiting cylinder and the isolation ring. The adjusting body slides into the inner cavity within the corresponding isolation ring. The spring is disposed within the limiting cylinder and supports the adjusting body to slide towards the workpiece. The isolation ring has a through hole for connecting the inner and outer cavities. Both the positioning sleeve and the adjusting body are provided with pistons, which slide into the corresponding cavities. The spring force is greater than the sum of the frictional forces between the two pistons and the inner walls of the corresponding cavities.

[0015] In summary, this application includes the following beneficial technical effects: When the workpiece is positioned with the tooling base during hoisting, the guide component can guide the workpiece's descent, reducing centering deviation caused by workpiece swaying. At the same time, guided by the guide cone groove, the positioning body at the bottom of the workpiece can quickly slide into the corresponding positioning hole, thereby reducing centering deviation during repeated hoisting of the workpiece and helping to ensure positioning accuracy and efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0017] Figure 2 This is an exploded view of the overall structure of Embodiment 1 of this application.

[0018] Figure 3 This is a partial structural cross-sectional view of the air-floating support in Embodiment 1 of this application.

[0019] Figure 4 This is a structural cross-sectional view of Embodiment 2 of this application.

[0020] Figure 5 yes Figure 4 Enlarged view of section A.

[0021] Explanation of reference numerals in the attached drawings: 1. Tooling base; 2. Positioning body; 3. Positioning hole; 4. Guide cone groove; 5. Guide plate; 51. Guide part; 6. Air float support body; 61. Support rod body; 62. Support block; 7. Air passage; 8. Mounting groove; 9. Connecting hole; 10. Air outlet; 11. Clamping assembly; 111. Clamping block; 112. Drive source; 12. Positioning sleeve; 13. Adjusting body; 14. Limiting cylinder; 15. Isolation ring; 16. Spring; 17. Through hole; 18. Piston; 19. Support; 20. Connecting rod; 21. Fitting groove; 22. Workpiece. Detailed Implementation

[0022] The following combination Figures 1-5 This application will be described in further detail.

[0023] Example 1:

[0024] This application discloses a high-precision tooling fixture for repeated workpiece hoisting on a CNC boring machine. (Refer to...) Figure 1 and Figure 2 The high-precision tooling fixture for repeated workpiece hoisting on a CNC boring machine includes a tooling base 1, a positioning body 2, and a guide assembly. The tooling base 1 is detachably mounted on the CNC boring machine's worktable. Specifically, the tooling base 1 can be fixed to the CNC boring machine's worktable by bolts, rivets, etc., which are not limited here. To improve the positioning accuracy between the tooling base 1 and the CNC boring machine's worktable, a zero-point positioning module can be integrated into the bottom wall of the tooling base 1. The zero-point positioning module is connected to the zero-point interface on the boring machine's worktable to ensure the positioning accuracy of the tooling. The zero-point positioning module and the zero-point interface are both existing technologies, and their structure and principle will not be described in detail here.

[0025] Reference Figure 1 and Figure 2 Furthermore, the cross-section of the tooling base 1 is rectangular, the upper surface of the tooling base 1 is the positioning surface, and the tooling base 1 is made of quenched steel with a surface roughness of Ra0.8 to ensure the smoothness and flatness of the positioning surface; the length of the workpiece 22 is greater than the length of the tooling base 1, and when the workpiece 22 is positioned on the tooling base 1, the workpiece 22 spans across the tooling base 1, and the width of the tooling base 1 is greater than or equal to half the length of the workpiece 22; due to the large mass of the workpiece 22, when the workpiece 22 is symmetrically placed on the tooling base 1, it will not tilt or other issues.

[0026] Reference Figure 2 Multiple positioning bodies 2 are provided, each welded to the bottom of the workpiece 22. The fixture base 1 has positioning holes 3 for insertion and positioning with the positioning bodies 2, each corresponding to a positioning body 2. The fixture base 1 also has guide conical grooves 4, each corresponding to a positioning hole 3, which are circumferentially spaced along the corresponding positioning hole 3. The inner diameter of the guide conical grooves 4 increases gradually away from the bottom wall of the positioning hole 3. A guiding assembly is provided on the fixture base 1 to guide the workpiece 22 as it is lowered during hoisting.

[0027] When workpiece 22 is positioned with fixture base 1 during hoisting, the guide assembly guides the descent of workpiece 22, reducing centering deviation caused by workpiece 22 swaying. Simultaneously, guided by the guide cone groove 4, the positioning body 2 can quickly slide into the corresponding positioning hole 3, thus reducing centering deviation during repeated hoisting of workpiece 22 and helping to ensure positioning accuracy and efficiency. Placing the positioning body 2 at the bottom of workpiece 22 avoids the need for drilling holes in workpiece 22; after processing, simply cutting off the positioning body 2 from workpiece 22 ensures its integrity.

[0028] Reference Figure 2 Two positioning bodies 2 are provided, symmetrically distributed along the centerline of the workpiece 22. One positioning body 2 has a circular cross-section, and the other positioning body 2 has a rhomboid cross-section. The cross-section of the positioning hole 3 is adapted to the cross-section of the corresponding positioning body 2, and the fitting clearance between the positioning body 2 and the corresponding positioning hole 3 is less than or equal to 0.01mm. The two positioning bodies 2 are respectively equipped with cylindrical pins and rhomboid pins, thus achieving a two-pin positioning method on one side, ensuring reliable positioning and reducing positioning errors.

[0029] Reference Figure 2 To facilitate the guidance of the workpiece 22 during hoisting and lowering, the guide assembly includes guide plates 5. There are two guide plates 5, which are detachably mounted on opposite sides of the fixture base 1. The two guide plates 5 are located on opposite sides of the workpiece 22. Specifically, the guide plates 5 are L-shaped. The guide plates 5 can be detachably fixed to the fixture base 1 by means of locking bolts, rivets, tension screws, etc., without any restrictions.

[0030] Reference Figure 2 The upper end of the guide plate 5 has a guide portion 51, which is inclined. The distance between the guide portions 51 of the two guide plates 5 decreases towards the tooling base 1, thereby forming a guide slope.

[0031] When the hoisting equipment lowers the workpiece 22 for installation, the arrangement of the two guide plates 5 enables the workpiece 22 to be aligned, facilitating the positioning of the workpiece 22 and improving positioning efficiency.

[0032] Reference Figure 2 To prevent the workpiece 22 from bouncing when it descends onto the fixture base 1, multiple buffer blocks can be installed on the surface of the fixture base 1 as needed. The buffer blocks are made of polyurethane material and absorb the impact of hoisting, thereby effectively reducing the possibility of the workpiece 22 bouncing.

[0033] Reference Figure 2 and Figure 3Air-bearing supports 6 are provided on opposite sides of the tooling base 1. The arrangement direction of the air-bearing supports 6 is parallel to the length direction of the workpiece 22 during positioning and installation. The air-bearing supports 6 are used to support the thin-walled area of ​​the workpiece 22. Specifically, the air-bearing supports 6 include support rods 61 and support blocks 62. The support rods 61 are located on the side of the tooling base 1. The upper surface of the support rods 61 is equal to or lower than the upper surface of the tooling base 1. An air passage 7 is provided inside the support rods 61 for communication with an external air source. Multiple air passages are provided on the upper surface of the support rods 61. Multiple mounting slots 8 are arranged at intervals along the length of the support rod 61. Each mounting slot 8 has multiple connecting holes 9 on its bottom wall, which are connected to the air passage 7. Support blocks 62 correspond one-to-one with the mounting slots 8 and are detachably fixed in the corresponding mounting slots 8 by countersunk bolts. The upper surface of the support block 62 is flush with the upper surface of the support rod 61. Multiple air outlets 10 are provided on the support block 62, which correspond one-to-one with the connecting holes 9. The air outlets 10 are used to align or offset with the corresponding connecting holes 9.

[0034] During the descent of workpiece 22 and the boring process, the air outlet 10 on the support block 62 aligned with the thin-walled area of ​​workpiece 22 is aligned with the connecting hole 9, while the air outlet 10 on the support block 62 misaligned with the thin-walled area of ​​workpiece 22 is misaligned with the connecting hole 9. The corresponding connecting hole 9 is then sealed. Then, the air passage 7 is connected to an external air source with an air pressure of 0.4-0.6 MPa. The gas is discharged from the air outlet 10 aligned with the connecting hole 9. The static pressure of the gas counteracts the deformation of the thin-walled area of ​​workpiece 22 due to its own weight, thereby helping to improve the positioning accuracy of workpiece 22.

[0035] Reference Figure 2 and Figure 3 Supports 19 are fixed on opposite sides of the tooling base 1, and each support 19 corresponds to an air-bearing support 6. The support rod 61 of the air-bearing support 6 is hinged to the corresponding support 19, and the hinge axis of the support rod 61 is set in the vertical direction. By rotating the support rod 61 of the air-bearing support 6, the position of the air-bearing support 6 can be changed, which helps to adapt to different workpieces 22.

[0036] Reference Figure 2 and Figure 3 The support 19 is equipped with a fixing component for fixing the support rod 61 relative to the tooling base 1. To facilitate the relative fixing of the support rod 61 and the tooling base 1, the fixing component uses a fixing bolt (not shown in the figure). The support 19 has a slotted hole (not shown in the figure). The fixing bolt passes through the slotted hole of the support 19 and the support rod 61 and then engages with the nut threadedly. By loosening or tightening the nut, it is helpful to adjust and fix the support rod 61 to the required position, avoiding unnecessary movement of the air-bearing support 6.

[0037] Reference Figure 2 The tooling fixture also includes a clamping assembly 11, which includes clamping blocks 111 and a drive source 112. Multiple clamping blocks 111 are provided, and the multiple clamping blocks 111 are slidably disposed on opposite sides of the tooling base 1. Specifically, in this embodiment, four clamping blocks 111 are provided, and the four clamping blocks 111 are symmetrically distributed in pairs on both sides of the length direction of the workpiece 22 when it is installed. The clamping blocks 111 are used to slide in the direction closer to or away from the workpiece 22 to clamp or release the workpiece 22. The sliding direction of the clamping blocks 111 is perpendicular to the length direction of the workpiece 22 when it is descending. The drive source 112 is disposed on the tooling base 1, and the drive source 112 corresponds one-to-one with the clamping blocks 111. The drive source 112 is used to drive the corresponding clamping block 111 to slide.

[0038] Reference Figure 2 To facilitate the sliding of the clamping block 111, the drive source 112 can be one of a cylinder, a hydraulic cylinder, etc., without any limitation. The clamping block 111 is fixedly connected to the piston rod of the corresponding drive source 112.

[0039] When the workpiece 22 descends, the clamping block 111 is positioned away from the center of the fixture base 1, providing sufficient space for the workpiece 22 to descend and be positioned. After the workpiece 22 is positioned with the fixture base 1, the corresponding clamping block 111 is driven by the drive source 112 to slide towards the center of the fixture base 1, so that the clamping block 111 clamps the workpiece 22, which is convenient for boring operations. Using a hydraulic or pneumatic drive method instead of manual bolt or pressure plate clamping helps to ensure uniform clamping force and to a certain extent avoids the workpiece 22 from deforming due to uneven clamping stress.

[0040] The implementation principle of Embodiment 1 of this application is as follows: Before hoisting the workpiece 22, the support rod 61 is rotated and fixed to the required position for the thin-walled and easily deformable area of ​​the workpiece 22. At the same time, the position of the support block 62 aligned with the thin-walled area of ​​the workpiece 22 is aligned with the air vent 10 and the connection hole 9, while the air vent 10 and the connection hole 9 on the support block 62 at other positions are misaligned.

[0041] During hoisting, as the workpiece 22 gradually descends, its bottom can quickly slide down and align with the fixture base 1 under the guidance of the guide portion 51 of the two guide plates 5, reducing the alignment deviation caused by the shaking of the workpiece 22. At the same time, under the guidance of the guide cone groove 4, the two positioning bodies 2 can quickly slide into the corresponding positioning holes 3. By connecting the air passage 7 to the external air source, the gas is discharged from the air outlet 10 aligned with the corresponding connection hole 9. The static pressure of the gas counteracts the deformation of the thin-walled area of ​​the workpiece 22 due to its own weight, thereby helping to improve the positioning accuracy of the workpiece 22. After the workpiece 22 is positioned, the drive source 112 is activated. The drive source 112 drives the corresponding clamping block 111 to slide towards the center of the fixture base 1, so that the clamping block 111 clamps the workpiece 22, thereby completing the positioning and installation of the workpiece 22. This application can reduce the alignment deviation during repeated hoisting of the workpiece 22 during boring, which helps to ensure positioning accuracy and positioning efficiency.

[0042] Example 2:

[0043] Reference Figure 4 and Figure 5 The difference between this embodiment and embodiment 1 is that a positioning sleeve 12 is slidably disposed vertically inside the tooling base 1. The positioning sleeve 12 corresponds one-to-one with the positioning hole 3, and the positioning hole 3 is opened on the corresponding positioning sleeve 12. The positioning sleeve 12 is used for positioning and insertion with the corresponding positioning body 2. The positioning sleeve 12 is located in the corresponding guide cone groove 4. The tooling base 1 is provided with a function to adjust the orientation of the positioning sleeve 12 toward or away from the workpiece 22 (see reference). Figure 2 The adjustment component that slides in the direction of the positioning body 2 is located outside the positioning hole 3, and the top wall of the positioning sleeve 12 is connected to the inner wall of the small diameter end of the corresponding guide cone groove 4.

[0044] Reference Figure 4 and Figure 5 To facilitate adjustment of the positioning sleeve 12 toward or away from the workpiece 22 (refer to...) Figure 2 The adjustment assembly includes an adjustment body 13 and a transmission component. The adjustment body 13 corresponds one-to-one with the positioning sleeve 12. The adjustment body 13 is located inside the corresponding positioning sleeve 12 and is slidably disposed in the tooling base 1 in the vertical direction. The adjustment body 13 is used to abut against the corresponding positioning body 2. The transmission component is used to drive the positioning sleeve 12 to slide when the adjustment body 13 slides. When the adjustment body 13 moves away from the workpiece 22, the transmission component drives the positioning sleeve 12 to move closer to the workpiece 22. When the workpiece 22 gradually descends, the positioning body 2 on the workpiece 22 gradually abuts against the adjustment body 13 at the corresponding position and moves down. The transmission component drives the positioning sleeve 12 to move up, so as to expand the contact area between the positioning sleeve 12 and the positioning body 2 and increase the lateral restraint force on the positioning body 2.

[0045] Reference Figure 4 and Figure 5To facilitate the sliding of the positioning sleeve 12 when the adjusting body 13 slides, the transmission component includes a limiting cylinder 14, an isolation ring 15, and a spring 16. The limiting cylinder 14 is embedded inside the tooling base 1, and the limiting cylinder 14 corresponds one-to-one with the positioning sleeve 12. The isolation ring 15 is fixedly installed inside the limiting cylinder 14. The outer diameter of the isolation ring 15 is smaller than the inner diameter of the limiting cylinder 14. The isolation ring 15 divides the corresponding limiting cylinder 14 into inner and outer cavities. The positioning sleeve 12 slides in the outer cavity between the corresponding limiting cylinder 14 and the isolation ring 15, and the adjusting body 13 slides in the inner cavity within the corresponding isolation ring 15. The setting of the limiting cylinder 14 and the isolation ring 15 helps to guide the sliding of the positioning sleeve 12 and the adjusting body 13.

[0046] Reference Figure 4 and Figure 5 Spring 16 corresponds one-to-one with adjusting body 13. Spring 16 is fixedly installed between the bottom wall of limiting cylinder 14 and the bottom wall of corresponding adjusting body 13. The extension direction of spring 16 is parallel to the sliding direction of corresponding adjusting body 13. Spring 16 is used to support adjusting body 13 towards workpiece 22 (refer to...). Figure 2 The isolation ring 15 has a through hole 17 at the bottom to connect the inner and outer cavities of the isolation ring 15. The bottom ends of the positioning sleeve 12 and the adjusting body 13 are fixedly bonded with pistons 18. The pistons 18 slide with the corresponding cavities. The elastic force of the spring 16 is greater than the sum of the frictional forces between the two pistons 18 and the inner wall of the corresponding cavity. When the spring 16 is in its natural state, the top end of the positioning sleeve 12 is connected to the inner wall of the small diameter end of the guide cone groove 4, so as not to affect the guidance of the guide cone groove 4 to the positioning body 2, making it convenient for the positioning body 2 to extend into the corresponding positioning sleeve 12.

[0047] Reference Figure 4 and Figure 5 The positioning sleeve 12 is hinged with multiple connecting rods 20 along its circumference. The hinge axis of the connecting rods 20 is perpendicular to the sliding direction of the positioning sleeve 12. A slider (not shown in the figure) is hinged to the end of the connecting rod 20 away from the corresponding positioning sleeve 12. The slider is slidably embedded in the inner wall of the corresponding guide cone groove 4. The inner wall of the guide cone groove 4 has a fitting groove 21 that engages with the connecting rod 20. The slider and the corresponding fitting groove 21 are slidably engaged. When the spring 16 is in its natural state, the top of the positioning sleeve 12 is connected to the small diameter end of the guide cone groove 4, and the connecting rod 20 is embedded in the corresponding fitting groove 21. The upper surface of the adjusting body 13 is lower than the upper surface of the corresponding positioning sleeve 12 to ensure the guiding effect of the guide cone groove 4 on the positioning body 2. When the bottom of the workpiece 22 is in contact with the surface of the tooling base 1, the spring 16 is in a compressed state, and the slider and the end of the fitting groove 21 away from the positioning sleeve 12 abut against each other. At this time, the connecting rod 20 provides circumferential support for the positioning sleeve 12, thereby improving the strength of the positioning sleeve 12.

[0048] The implementation principle of Embodiment 2 of this application is as follows: when the workpiece 22 is not positioned and installed with the tooling base 1, the spring 16 is in its natural state, the top end of the positioning sleeve 12 is connected to the small diameter end of the guide cone groove 4, and the connecting rod 20 is fitted into the corresponding fitting groove 21.

[0049] As the workpiece 22 is gradually hoisted and lowered, the positioning body 2 of the workpiece 22 slides quickly into the corresponding positioning sleeve 12 under the guidance of the guide cone groove 4. Then, as the workpiece 22 continues to descend, the positioning body 2 presses the corresponding adjusting body 13, causing the adjusting body 13 to compress the corresponding spring 16, and pushing the gas in the inner cavity of the isolation ring 15 through the through hole 17 to the outer cavity of the isolation ring 15. The gas drives the piston 18 in the outer cavity to move the corresponding positioning sleeve 12 upward, increasing the contact area between the positioning sleeve 12 and the positioning body 2. The positioning sleeve 12 drives the corresponding connecting rod 20 to make the slider slide until the bottom of the workpiece 22 is in contact with the surface of the tooling base 1. At this time, the slider and the end of the fitting groove 21 away from the positioning sleeve 12 abut against each other. The connecting rod 20 provides circumferential limiting support for the positioning sleeve 12. By increasing the contact area between the positioning sleeve 12 and the corresponding positioning body 2, the lateral limiting strength of the positioning body 2 can be improved.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-precision tooling fixture for repeated lifting of a workpiece in a numerical control boring machine, characterized in that, Include: Tool base (1), the tool base (1) is used detachable installation on the boring machine workbench; Positioning body (2), a plurality of positioning body (2) are provided, a plurality of positioning body (2) are provided at the bottom of the workpiece (22), the tool base (1) is provided with a plurality of positioning holes (3) for inserting and positioning with the positioning body (2), the positioning hole (3) corresponds to the positioning body (2), the tool base (1) is provided with a guide taper groove (4), the guide taper groove (4) corresponds to the positioning hole (3), the guide taper groove (4) is provided along the circumference of the corresponding positioning hole (3), the inner diameter of the guide taper groove (4) increases towards the direction away from the bottom wall of the positioning hole (3); The guide assembly is provided on the tool base (1), which is used for guiding the workpiece (22) lowered by hoisting.

2. The high-precision fixture clamp for repeated lifting of a workpiece of a numerical control boring machine according to claim 1, characterized in that: The positioning body (2) is relatively provided with two, wherein the cross section of one of the positioning body (2) is circular, and the cross section of the other positioning body (2) is rhombic, the cross section of the positioning hole (3) is matched with the cross section of the corresponding positioning body (2), and the fitting clearance between the positioning body (2) and the corresponding positioning hole (3) is less than or equal to 0.01mm.

3. The high-precision fixture clamp for repeatedly hoisting workpieces of a numerical control boring machine according to claim 2, characterized in that: The guide assembly includes a guide plate (5) oppositely provided on the tool base (1), the guide plate (5) is detachably provided on the tool base (1), the guide plate (5) has a guide part (51), the guide part (51) is inclinedly provided, and the distance between the two guide parts (51) decreases towards the direction close to the tool base (1).

4. The high-precision fixture clamp for repeatedly hoisting workpieces of a numerical control boring machine according to claim 1, characterized in that: The length of the tool base (1) is less than the length of the workpiece (22), and the tool base (1) is provided with air floating support bodies (6) on opposite sides, and the air floating support bodies (6) are used for supporting the thin wall area of the workpiece (22).

5. The high-precision fixture clamp for repeatedly hoisting workpieces of a numerical control boring machine according to claim 4, characterized in that: The air floating support body (6) includes a support rod body (61) and a support block (62), the support rod body (61) is provided on the tool base (1), the support rod body (61) is provided with an air channel (7) therein, the air channel (7) is used for communicating with an external air source, a plurality of mounting grooves (8) are formed in the support rod body (61), a plurality of connecting holes (9) are formed in the bottom wall of the mounting groove (8), the connecting holes (9) are in communication with the air channel (7), the support block (62) is arranged in the mounting groove (8), a plurality of air outlet holes (10) are formed in the support block (62), the air outlet holes (10) correspond to the connecting holes (9) one by one, and the air outlet holes (10) are used for aligning or misaligning with the corresponding connecting holes (9).

6. The high-precision fixture clamp for repeatedly hoisting workpieces of a numerical control boring machine according to claim 4, characterized in that: The air floating support body (6) is hinged on the tool base (1), and the hinge axis of the air floating support body (6) is arranged in the vertical direction.

7. The high-precision fixture clamp for repeatedly hoisting workpieces of a numerical control boring machine according to claim 1, characterized in that: The tool clamp further comprises a clamping assembly (11), the clamping assembly (11) comprising clamping blocks (111) slidingly arranged on opposite sides of the tool base (1) and a driving source (112) arranged on the tool base (1), the clamping blocks (111) being used to slide towards the direction close to or away from the workpiece (22) to clamp or release the workpiece (22), and the driving source (112) being used to drive the clamping blocks (111) to slide.

8. The high-precision fixture clamp for repeatedly hoisting workpieces of a numerical control boring machine according to claim 1, characterized in that: A positioning sleeve (12) is slidingly arranged in the tool base (1) in the vertical direction, the positioning sleeve (12) corresponding to the positioning hole (3), the positioning hole (3) being arranged on the corresponding positioning sleeve (12), the positioning sleeve (12) being arranged in the corresponding guide cone groove (4), and the tool base (1) being provided with an adjusting assembly for adjusting the sliding direction of the positioning sleeve (12) towards the direction close to or away from the workpiece (22), and when the positioning body (2) is located outside the positioning hole (3), the top wall of the positioning sleeve (12) is connected with the inner wall of the small-diameter end of the corresponding guide cone groove (4).

9. The high-precision fixture clamp for repeatedly hoisting workpieces of a numerical control boring machine according to claim 8, characterized in that: The adjusting assembly comprises an adjusting body (13) and a transmission member, the adjusting body (13) corresponding to the positioning sleeve (12), the adjusting body (13) being arranged in the corresponding positioning sleeve (12), the adjusting body (13) being slidingly arranged in the tool base (1) in the vertical direction, the adjusting body (13) being used to abut against the corresponding positioning body (2), and the transmission member being used to drive the positioning sleeve (12) to slide when the adjusting body (13) slides, and when the adjusting body (13) moves towards the direction away from the workpiece (22), the transmission member drives the positioning sleeve (12) to move towards the direction close to the workpiece (22).

10. The high-precision fixture clamp for repeatedly hoisting workpieces of a numerical control boring machine according to claim 9, characterized in that: The transmission member comprises a limiting cylinder (14), an isolation ring (15) and a spring (16), the limiting cylinder (14) being arranged in the tool base (1), the limiting cylinder (14) corresponding to the positioning sleeve (12), the isolation ring (15) being arranged in the limiting cylinder (14), the isolation ring (15) separating the corresponding limiting cylinder (14) into two cavities, the positioning sleeve (12) being slidingly fitted with the outer cavity between the corresponding limiting cylinder (14) and the isolation ring (15), the adjusting body (13) being slidingly fitted with the inner cavity in the corresponding isolation ring (15), the spring (16) being arranged in the limiting cylinder (14), the spring (16) being used to support the adjusting body (13) to slide towards the direction close to the workpiece (22), a through hole (17) being arranged on the isolation ring (15) to communicate the two cavities in the isolation ring (15), a piston (18) being arranged on the positioning sleeve (12) and the adjusting body (13), the piston (18) being slidingly fitted with the corresponding cavity, and the elastic force of the spring (16) being greater than the sum of the frictional forces between the two pistons (18) and the inner walls of the corresponding cavities.

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