High-precision tooling fixture for repeated hoisting of workpieces of numerical control boring machine

Abstract

The application relates to a high-precision tooling fixture for repeatedly hoisting workpieces of a numerical control boring machine, and belongs to the technical field of boring machining. The high-precision tooling fixture for repeatedly hoisting workpieces of the numerical control boring machine comprises a tooling base, positioning bodies and a guide assembly. The tooling base is used for detachable installation on a boring machine workbench. The positioning bodies are provided in plurality. The positioning bodies are arranged at the bottom of the workpieces. Positioning holes for plug-in positioning cooperation with the positioning bodies are arranged on the tooling base. The positioning holes correspond to the positioning bodies in one-to-one mode. Guide taper grooves are arranged on the tooling base. The guide taper grooves correspond to the positioning holes in one-to-one mode. The guide taper grooves are arranged along the circumferential direction of the corresponding positioning holes. The inner diameter of the guide taper grooves increases in the direction away from the bottom wall of the positioning hole. The guide assembly is arranged on the tooling base and is used for guiding the workpieces hoisted downwards. The application has the advantages of guaranteeing positioning accuracy and positioning efficiency.

Description

TECHNICAL FIELD

[0001] The application relates to the boring machining technical field, in particular to a high-precision tooling fixture for repeated hoisting of workpieces of a numerical control boring machine. BACKGROUND

[0002] Boring machining refers to a cutting process for expanding the inner diameter of a prefabricated hole in a workpiece by a boring tool. When boring machining is performed on a workpiece with a weight greater than 50 kg, hoisting equipment is usually used to hoist the workpiece to a tooling fixture on a boring machine workbench, the workpiece is clamped and fixed by the tooling fixture, and the workpiece can be machined by a boring tool on the boring machine.

[0003] In boring machining, repeated hoisting of the workpiece is often involved when the workpiece machining surface needs to be changed or the workpiece needs to be moved to adapt to the machining range of the numerical control boring machine. The positioning accuracy of the workpiece in repeated hoisting directly affects the machining quality. At present, when the workpiece is repeatedly hoisted, the workpiece will shake and deviate from the center of the positioning surface of the tooling fixture, resulting in inaccurate positioning and low positioning efficiency. SUMMARY

[0004] To help ensure positioning accuracy and efficiency, the application provides a high-precision tooling fixture for repeated hoisting of workpieces of a numerical control boring machine.

[0005] The high-precision tooling fixture for repeated hoisting of workpieces of a numerical control boring machine provided by the application adopts the following technical solution:

[0006] A high-precision tooling fixture for repeated hoisting of workpieces of a numerical control boring machine comprises:

[0007] A tooling base, which is used for detachable installation on a boring machine workbench;

[0008] A plurality of positioning bodies are provided, and the plurality of positioning bodies are arranged at the bottom of the workpiece. Positioning holes for positioning and mating with the positioning bodies are formed in the tooling base, and the positioning holes correspond one-to-one to the positioning bodies. A guide taper groove is formed in the tooling base, and the guide taper groove corresponds one-to-one to the positioning holes. The guide taper groove is formed along the circumference of the corresponding positioning hole, and the inner diameter of the guide taper groove increases in the direction away from the bottom wall of the positioning hole.

[0009] A guide assembly is arranged on the tooling base and is used for guiding the workpiece during hoisting.

[0010] Preferably, the positioning bodies are arranged in pairs, one of which has a circular cross-section and the other has a rhombic 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.

[0011] Preferably, the guiding assembly comprises guiding plates oppositely arranged on the tool base, the guiding plates are detachably arranged on the tool base, the guiding plates are provided with guiding portions, the guiding portions are arranged in an inclined manner, and the distance between the two guiding portions decreases towards the direction close to the tool base.

[0012] Preferably, the length of the tool base is less than the length of the workpiece, and the tool base is provided with air floating supports on opposite sides thereof, the air floating supports being used for supporting the thin-walled area of the workpiece.

[0013] Preferably, the air floating support comprises a support rod and a support block, the support rod is arranged on the tool base, the support rod is provided with an air channel therein, the air channel is used for communicating with an external air source, a plurality of mounting grooves are formed in the support rod, a plurality of connecting holes are formed in the bottom wall of each mounting groove, the connecting holes are in communication with the air channel, the support block is arranged in the mounting groove, a plurality of air outlet holes are formed in the support block, the air outlet holes correspond to the connecting holes one by one, and the air outlet holes are used for being aligned with or misaligned with the corresponding connecting holes.

[0014] Preferably, the air floating support is hinged to the tool base, and the hinge axis of the air floating support is arranged in a vertical direction.

[0015] Preferably, the tool clamp further comprises a clamping assembly, the clamping assembly comprises clamping blocks slidingly arranged on opposite sides of the tool base and a driving source arranged on the tool base, the clamping blocks are used for sliding towards the direction close to or away from the workpiece to clamp or release the workpiece, and the driving source is used for driving the clamping blocks to slide.

[0016] Preferably, a positioning sleeve is slidingly arranged in the tool base in a vertical direction, the positioning sleeve corresponds to a positioning hole one by one, the positioning hole is formed in the corresponding positioning sleeve, the positioning sleeve is located in the corresponding guiding conical groove, the tool base is provided with an adjusting assembly used for adjusting the sliding direction of the positioning sleeve towards the direction close to or away from the workpiece, and when the positioning body is located outside the positioning hole, the top wall of the positioning sleeve is in abutment with the inner wall of the small-diameter end of the corresponding guiding conical groove.

[0017] Preferably, the adjusting assembly comprises an adjusting body and a transmission member, the adjusting body corresponds to the positioning sleeve one by one, the adjusting body is located in the corresponding positioning sleeve, the adjusting body is slidingly arranged in the tool base in a vertical direction, the adjusting body is used for being in abutment with the corresponding positioning body, and the transmission member is used for driving the positioning sleeve to slide when the adjusting body slides, and when the adjusting body moves towards the direction away from the workpiece, the transmission member drives the positioning sleeve to move towards the direction close to the workpiece.

[0018] Preferably, the transmission member comprises a limiting cylinder, an isolation ring and a spring, the limiting cylinder is arranged in the tool base, the limiting cylinder is in one-to-one correspondence with the positioning sleeve, the isolation ring is arranged in the limiting cylinder, the isolation ring separates the corresponding limiting cylinder into two cavities, the positioning sleeve and the outer cavity between the corresponding limiting cylinder and the isolation ring are in sliding fit, the adjusting body and the inner cavity in the corresponding isolation ring are in sliding fit, the spring is arranged in the limiting cylinder, the spring is used for supporting the adjusting body to slide towards the direction close to the workpiece, the isolation ring is provided with a through hole for connecting the two cavities in the isolation ring, the positioning sleeve and the adjusting body are both provided with a piston, the piston and the corresponding cavity are in sliding fit, and the elastic force of the spring is greater than the sum of the frictional forces between the two pistons and the inner walls of the corresponding cavities.

[0019] In summary, the present application has the following beneficial technical effects:

[0020] When the workpiece is positioned with the tool base during hoisting, the setting of the guide assembly can guide the lowering of the workpiece, reduce the centering deviation caused by the shaking of the workpiece, and under the guidance of the guide taper groove, the positioning body at the bottom of the workpiece can quickly slide into the corresponding positioning hole, thereby reducing the centering deviation in the repeated hoisting of the workpiece, and helping to ensure the positioning accuracy and efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the overall structure schematic diagram of embodiment 1 of the present application.

[0022] Figure 2 is the overall structure explosion diagram of embodiment 1 of the present application.

[0023] Figure 3 is the partial structure sectional view of the air floating support body in embodiment 1 of the present application.

[0024] Figure 4 is the structure sectional view of embodiment 2 of the present application.

[0025] Figure 5 is Figure 4 is the enlarged view of part A.

[0026] BRIEF DESCRIPTION OF DRAWINGS 1, tool base; 2, positioning body; 3, positioning hole; 4, guide taper groove; 5, guide plate; 51, guide part; 6, air floating support body; 61, support rod body; 62, support block; 7, air channel; 8, mounting groove; 9, connecting hole; 10, air outlet hole; 11, clamping assembly; 111, clamping block; 112, driving 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 DESCRIPTION

[0027] The following description is made in connection with Figures 1-5 The application is further described in detail.

[0028] Embodiment 1:

[0029] The embodiment of the application discloses a high-precision tool clamp for repeatedly hoisting workpieces of a numerical control boring machine. Figure 1 and Figure 2 The high-precision tool clamp for repeatedly hoisting workpieces of a numerical control boring machine comprises a tool base 1, a positioning body 2 and a guide assembly, wherein the tool base 1 is used for being detachably installed on a workbench of the numerical control boring machine, specifically, the tool base 1 can be fixed on the workbench of the numerical control boring machine by means of bolts, rivets and the like, which is not limited herein; in order to improve the positioning accuracy between the tool base 1 and the workbench of the numerical control boring machine, a zero-point positioning module can be integrated on the bottom wall of the tool base 1, the zero-point positioning module is connected to a zero-point interface on the workbench of the boring machine through butt joint, so as to ensure the positioning accuracy of the tool, wherein the zero-point positioning module and the zero-point interface both belong to the prior art, and their structures and principles will not be described in detail herein.

[0030] Referring to Figure 1 and Figure 2 Further, the cross section of the tool base 1 is rectangular, the upper surface of the tool base 1 is a positioning surface, and the tool base 1 is made of quenched steel, the surface roughness of which is Ra0.8, so as to ensure the smoothness of the positioning surface; the length of the workpiece 22 is greater than the length of the tool base 1, when the workpiece 22 is positioned and placed on the tool base 1, the workpiece 22 spans the tool base 1, and the width of the tool base 1 is greater than or equal to one half of the length of the workpiece 22; due to the large mass of the workpiece 22, when the workpiece 22 is symmetrically placed on the tool base 1, the workpiece 22 will not be warped or the like.

[0031] Referring to Figure 2 The positioning body 2 is provided in plurality, and the plurality of positioning bodies 2 are all welded at the bottom of the workpiece 22, the tool base 1 is provided with positioning holes 3 for plug-in positioning cooperation with the positioning bodies 2, the positioning holes 3 correspond to the positioning bodies 2 one by one, the tool base 1 is provided with guide taper grooves 4, the guide taper grooves 4 correspond to the positioning holes 3 one by one, the guide taper grooves 4 are provided along the circumferential direction of the corresponding positioning holes 3, and the inner diameter of the guide taper grooves 4 increases in the direction away from the bottom wall of the positioning hole 3. The guide assembly is arranged on the tool base 1 and is used for guiding the workpiece 22 hoisted downward.

[0032] When the workpiece 22 is positioned with the tooling base 1 in the lifting process, the guide assembly can guide the lowering of the workpiece 22, reduce the centering deviation caused by the shaking of the workpiece 22, and under the guidance of the guide cone groove 4, the positioning body 2 can quickly slide into the corresponding positioning hole 3, thereby reducing the centering deviation in the repeated lifting of the workpiece 22, and helping to ensure the positioning accuracy and positioning efficiency. By arranging the positioning body 2 at the bottom of the workpiece 22, the hole can be avoided on the workpiece 22, and after processing, only the positioning body 2 on the workpiece 22 needs to be cut off to ensure the integrity of the workpiece 22.

[0033] Referring to Figure 2 , the positioning body 2 is provided with two, and the two positioning bodies 2 are symmetrically distributed along the center line of the workpiece 22; one of the positioning bodies 2 is circular in cross section, and the other positioning body 2 is rhombic in 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 gap between the positioning body 2 and the corresponding positioning hole 3 is less than or equal to 0.01 mm. Two positioning bodies 2 are respectively provided with cylindrical pins and rhombic pins, so as to realize the positioning mode of one side and two pins, which is reliable and reduces the positioning error.

[0034] Referring to Figure 2 , in order to guide the workpiece 22 lowered by lifting, the guide assembly comprises a guide plate 5, and the guide plate 5 is provided with two, and the two guide plates 5 are respectively detachably arranged on the opposite sides of the tooling base 1, and the two guide plates 5 are located on the opposite sides of the workpiece 22. Specifically, the guide plate 5 is L-shaped, and the guide plate 5 can be detachably fixed on the tooling base 1 by means of locking bolts, rivets, tensioning screws and the like, which is not limited herein.

[0035] Referring to Figure 2 , the guide plate 5 has a guide portion 51 at the upper end, and the guide portion 51 is inclinedly arranged, and the distance between the guide portions 51 of the two guide plates 5 decreases towards the direction close to the tooling base 1, thereby forming a guide slope.

[0036] When the lifting equipment lifts the workpiece 22 to be lowered and installed, the arrangement of the two guide plates 5 can center the workpiece 22, which facilitates the positioning of the workpiece 22 and improves the positioning efficiency.

[0037] Referring to Figure 2 , in order to avoid the workpiece 22 from bouncing when it is lowered onto the tooling base 1, a plurality of buffer blocks can be arranged on the surface of the tooling base 1 as needed, and the buffer blocks are made of polyurethane material. By absorbing the lifting impact through the buffer blocks, the possibility of bouncing of the workpiece 22 can be well reduced.

[0038] Referring to Figure 3 and Figure 2, the opposite sides of the tool base 1 are provided with air floating support bodies 6, the arrangement direction of the air floating support bodies 6 on the two sides is parallel to the length direction of the workpiece 22 during positioning and installation, the air floating support bodies 6 are used for supporting the thin-wall area of the workpiece 22, specifically, the air floating support bodies 6 include support rod bodies 61 and support blocks 62, the support rod bodies 61 are arranged at the side edges of the tool base 1, the upper surfaces of the support rod bodies 61 are equal to or lower than the upper surface of the tool base 1, air channels 7 are arranged in the support rod bodies 61, the air channels 7 are used for communicating with the external air source; a plurality of installation grooves 8 are arranged on the upper surfaces of the support rod bodies 61, the installation grooves 8 are arranged in the length direction of the support rod bodies 61 at intervals, a plurality of connecting holes 9 are arranged on the bottom walls of each installation groove 8, the connecting holes 9 are in communication with the air channels 7, the support blocks 62 correspond to the installation grooves 8 one by one, the support blocks 62 are detachably fixed in the corresponding installation grooves 8 through the counterbores, the upper surfaces of the support blocks 62 are flush with the upper surface of the support rod bodies 61, a plurality of air outlet holes 10 are arranged on the support blocks 62, the air outlet holes 10 correspond to the connecting holes 9 one by one, the air outlet holes 10 are used for aligning or misaligning with the corresponding connecting holes 9.

[0039] During the lowering of the workpiece 22 and the processing of the boring cutter, the air outlet holes 10 on the support blocks 62 aligned with the thin-wall area of the workpiece 22 are aligned with the connecting holes 9, while the air outlet holes 10 on the support blocks 62 misaligned with the thin-wall area of the workpiece 22 are misaligned with the connecting holes 9, the corresponding connecting holes 9 are closed, then the air channels 7 are connected to the external air source, the air pressure is designed to be 0.4-0.6 MPa, the gas is discharged from the air outlet holes 10 aligned with the connecting holes 9, and the self-weight deformation of the thin-wall area of the workpiece 22 is offset by the gas static pressure, thereby helping to improve the positioning accuracy of the workpiece 22.

[0040] With reference to Figure 3 and Figure 2 , the opposite sides of the tool base 1 are fixed with supports 19, the supports 19 correspond to the air floating support bodies 6 one by one, the support rod bodies 61 of the air floating support bodies 6 are hinged on the corresponding supports 19, and the hinge axes of the support rod bodies 61 are arranged in the vertical direction. By rotating the support rod bodies 61 of the air floating support bodies 6, the positions of the air floating support bodies 6 can be changed, which helps to adapt to different workpieces 22.

[0041] With reference to Figure 3 and Figure 2 , the supports 19 are provided with fixing members for relatively fixing the support rod bodies 61 and the tool base 1, in order to facilitate the relative fixation of the support rod bodies 61 and the tool base 1, the fixing members adopt fixing bolts (not shown in the figure), the supports 19 are provided with strip-shaped holes (not shown in the figure), and the fixing bolts pass through the strip-shaped holes of the supports 19 and the support rod bodies 61 and are then threadedly connected with nuts. By loosening or tightening the nuts, the support rod bodies 61 can be adjusted and fixed to the required positions, thereby avoiding unnecessary movement of the air floating support bodies 6.

[0042] With reference toFigure 2 The tool clamp further comprises clamping assemblies 11, each of which comprises a clamping block 111 and a driving source 112. The clamping blocks 111 are provided in plurality, and each of the clamping blocks 111 is slidingly arranged on opposite sides of the tool base 1. Specifically, in the embodiment of the present application, four clamping blocks 111 are provided, and the four clamping blocks 111 are symmetrically distributed on two sides of the workpiece 22 in the length direction of the workpiece 22 when the workpiece 22 is installed. The clamping blocks 111 are used to slide towards the direction close 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 the workpiece 22 is lowered. The driving sources 112 are arranged on the tool base 1, and each of the driving sources 112 corresponds to one of the clamping blocks 111. The driving sources 112 are used to drive the corresponding clamping blocks 111 to slide.

[0043] With reference to Figure 4 To facilitate the sliding of the clamping blocks 111, the driving sources 112 can adopt one of a pneumatic cylinder, a hydraulic cylinder, etc., which is not limited herein. The clamping blocks 111 are fixedly connected with the piston rods of the corresponding driving sources 112.

[0044] When the workpiece 22 is lowered, the clamping blocks 111 are away from the center of the tool base 1, and provide sufficient space for the positioning of the workpiece 22. After the workpiece 22 is positioned with the tool base 1, the corresponding clamping blocks 111 are driven by the driving sources 112 to slide towards the center of the tool base 1, so that the clamping blocks 111 clamp the workpiece 22, facilitating the boring operation. The use of hydraulic or pneumatic driving mode instead of manual bolts or clamping plates helps to ensure uniform clamping force and to a certain extent avoid deformation of the workpiece 22 due to uneven clamping stress.

[0045] The implementation principle of the embodiment 1 of the present application is that, before the workpiece 22 is hoisted, the support rod body 61 is rotated and fixed to the required position for the thin-walled deformation area of the workpiece 22, and the positions of the support blocks 62 aligned with the thin-walled area of the workpiece 22 are made to align the air outlets 10 with the connecting holes 9, while the air outlets 10 on the support blocks 62 at other positions are out of position with the connecting holes 9.

[0046] When hoisting, as the workpiece 22 gradually descends, the bottom of the workpiece 22 can quickly slide and center with the tool base 1 under the action of the guide portions 51 of the two guide plates 5, reducing the centering deviation of the workpiece 22 caused by shaking, and under the guidance of the guide taper grooves 4, the two positioning bodies 2 can quickly slide into the corresponding positioning holes 3. By connecting the air passages 7 to the external air source, gas is discharged from the air outlet holes 10 aligned with the corresponding connecting holes 9, and the self-weight deformation of the thin-walled area of the workpiece 22 is offset by the gas static pressure, thereby helping to improve the positioning accuracy of the workpiece 22. After the positioning of the workpiece 22 is completed, the driving source 112 is started, and the driving source 112 drives the corresponding clamping blocks 111 to slide towards the center of the tool base 1, so that the clamping blocks 111 clamp the workpiece 22, thereby completing the positioning and installation of the workpiece 22. The present application can reduce the centering deviation in repeated hoisting of the workpiece 22 during boring machining, and help to ensure positioning accuracy and positioning efficiency.

[0047] Embodiment 2

[0048] With reference to Figure 5 and Figure 2 , the difference between this embodiment and embodiment 1 is that a positioning sleeve 12 is arranged in the tool base 1 to slide in the vertical direction, the positioning sleeve 12 corresponds to the positioning hole 3 one by one, the positioning hole 3 is opened on the corresponding positioning sleeve 12, and the positioning sleeve 12 is used for positioning plug-in cooperation with the corresponding positioning body 2; the positioning sleeve 12 is located in the corresponding guide taper groove 4, and the tool base 1 is provided with an adjusting assembly for adjusting the sliding direction of the positioning sleeve 12 towards the workpiece 22 (see Figure 4 ).

[0049] With reference to Figure 5 and Figure 2 , in order to facilitate the sliding of the positioning sleeve 12 towards the workpiece 22 (see Figure 4 ), the adjusting assembly includes an adjusting body 13 and a transmission member, the adjusting body 13 corresponds to the positioning sleeve 12 one by one, the adjusting body 13 is located in the corresponding positioning sleeve 12, the adjusting body 13 is arranged in the tool base 1 to slide in the vertical direction, the adjusting body 13 is used for abutting against the corresponding positioning body 2, and the transmission member is used for driving the positioning sleeve 12 to slide when the adjusting body 13 slides. 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; when the workpiece 22 gradually descends, the positioning body 2 on the workpiece 22 gradually abuts against the adjusting body 13 at the corresponding position and moves downward, and the adjusting body 13 drives the positioning sleeve 12 to move upward through the transmission member, so as to enlarge the contact area between the positioning sleeve 12 and the positioning body 2 and improve the lateral limiting force of the positioning body 2.

[0050] With reference to Figure 5 and Figure 4For the convenience of sliding the adjusting body 13 to drive the positioning sleeve 12 to slide, the transmission member includes a limiting cylinder 14, an isolation ring 15 and a spring 16, wherein the limiting cylinder 14 is embedded in the tool base 1, the limiting cylinder 14 corresponds to the positioning sleeve 12, the isolation ring 15 is fixedly arranged in 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 separates the corresponding limiting cylinder 14 into two cavities, the positioning sleeve 12 is in sliding fit with the outer cavity between the corresponding limiting cylinder 14 and the isolation ring 15, the adjusting body 13 is in sliding fit with the inner cavity in the corresponding isolation ring 15, and the limiting cylinder 14 and the isolation ring 15 are arranged to guide the sliding of the positioning sleeve 12 and the adjusting body 13.

[0051] With reference to Figure 5 and Figure 2 , the spring 16 corresponds to the adjusting body 13, the spring 16 is fixedly arranged between the bottom wall of the limiting cylinder 14 and the bottom wall of the corresponding adjusting body 13, the extension direction of the spring 16 is parallel to the sliding direction of the corresponding adjusting body 13, the spring 16 is used for supporting the adjusting body 13 to slide towards the direction close to the workpiece 22 (with reference to Figure 4 ), the bottom of the isolation ring 15 is provided with a through hole 17 for connecting the two cavities in the isolation ring 15, the bottom end of the positioning sleeve 12 and the adjusting body 13 is fixedly bonded with a piston 18, the piston 18 is in sliding fit with the corresponding cavity, and the elastic force of the spring 16 is greater than the sum of the frictional forces between the two pistons 18 and the inner walls of the corresponding cavities; when the spring 16 is in a natural state, the top end of the positioning sleeve 12 is in abutment with the inner wall of the small-diameter end of the guide taper groove 4, so as not to affect the guidance of the positioning body 2 by the guide taper groove 4, and the positioning body 2 is conveniently inserted into the corresponding positioning sleeve 12.

[0052] With reference to Figure 5 and ​ , a plurality of connecting rods 20 are hingedly arranged on the positioning sleeve 12 in the circumferential direction of the positioning sleeve 12, the hinging axis of the connecting rod 20 is perpendicular to the sliding direction of the positioning sleeve 12, one end of the connecting rod 20 away from the corresponding positioning sleeve 12 is hingedly connected with a sliding block (not shown in the figure), the sliding block is slidingly embedded on the inner wall of the corresponding guide taper groove 4, the inner wall of the guide taper groove 4 is provided with a fitting groove 21 in fitting fit with the connecting rod 20, the sliding block is in sliding fit with the corresponding fitting groove 21, when the spring 16 is in a natural state, the top end of the positioning sleeve 12 is in abutment with the small-diameter end of the guide taper groove 4, and the connecting rod 20 is fitted in the corresponding fitting groove 21, and the upper surface of the adjusting body 13 is lower than the upper surface of the corresponding positioning sleeve 12, so as to ensure the guiding effect of the positioning body 2 by the guide taper groove 4; when the bottom of the workpiece 22 is attached to the surface of the tool base 1, the spring 16 is in a compressed state, and the sliding block is in abutment with one end of the fitting groove 21 away from the positioning sleeve 12, at this time, the circumferential direction of the positioning sleeve 12 is supported by the connecting rod 20, and the strength of the positioning sleeve 12 is improved.

[0053] The implementation principle of the embodiment 2 of the application is as follows: when the workpiece 22 is not positioned and installed with the tool base 1, the spring 16 is in a natural state, the top end of the positioning sleeve 12 is connected with the small-diameter end of the guide taper groove 4, and the connecting rod 20 is embedded in the corresponding embedded groove 21.

[0054] When the workpiece 22 is gradually hoisted and lowered, the positioning body 2 of the workpiece 22 is guided by the guide taper groove 4 and quickly slides into the corresponding positioning sleeve 12, then with the continuous lowering of the workpiece 22, the positioning body 2 presses the corresponding adjusting body 13, the adjusting body 13 compresses the corresponding spring 16, and the gas in the inner cavity of the isolation ring 15 is pushed into the outer cavity of the isolation ring 15 through the through hole 17, the gas drives the piston 18 in the outer cavity to drive the corresponding positioning sleeve 12 to move upward to increase the contact area of the positioning sleeve 12 and the positioning body 2, the positioning sleeve 12 drives the corresponding connecting rod 20 to slide the sliding block, until the bottom of the workpiece 22 is attached to the surface of the tool base 1, at this time, the sliding block is abutted with the end of the embedded groove 21 away from the positioning sleeve 12, the connecting rod 20 limits and supports the circumference of the positioning sleeve 12, and by increasing the contact area of the positioning sleeve 12 and the corresponding positioning body 2, the transverse limiting strength of the positioning body 2 can be improved.

[0055] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, therefore: any equivalent changes made according to the structure, shape and principle of the application should be covered in the protection scope of the 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), which is detachably mounted on the boring machine workbench; A plurality of positioning bodies (2) are provided, and the positioning bodies (2) are arranged at the bottom of the workpiece (22), the tool base (1) is provided with positioning holes (3) for inserting and positioning with the positioning bodies (2), the positioning holes (3) correspond one-to-one with the positioning bodies (2), the tool base (1) is provided with guide tapered grooves (4), the guide tapered grooves (4) correspond one-to-one with the positioning holes (3), the guide tapered grooves (4) are arranged along the circumference of the corresponding positioning holes (3), and the inner diameter of the guide tapered grooves (4) increases in the direction away from the bottom wall of the positioning hole (3); A guide assembly is arranged on the tool base (1) and is used for guiding the workpiece (22) hoisted and lowered; The positioning sleeve (12) is arranged in the tool base (1) and slides in the vertical direction, the positioning sleeve (12) corresponds one-to-one with the positioning hole (3), the positioning hole (3) is arranged on the corresponding positioning sleeve (12), the positioning sleeve (12) is located in the corresponding guide tapered groove (4), and the tool base (1) is provided with an adjusting assembly for adjusting the positioning sleeve (12) to slide in the direction close to or away from the workpiece (22), 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 one end of the small diameter of the corresponding guide tapered groove (4); The adjusting assembly comprises an adjusting body (13) and a transmission member, the adjusting body (13) corresponds one-to-one with the positioning sleeve (12), the adjusting body (13) is located in the corresponding positioning sleeve (12), the adjusting body (13) is arranged in the tool base (1) and slides in the vertical direction, the adjusting body (13) is used for abutting against the corresponding positioning body (2), and the transmission member is used for driving the positioning sleeve (12) to slide when the adjusting body (13) slides, when the adjusting body (13) moves away from the workpiece (22), the transmission member drives the positioning sleeve (12) to move towards the workpiece (22). The transmission member includes a limiting cylinder (14), a separation ring (15) and a spring (16), the limiting cylinder (14) is arranged in the tool base (1), the limiting cylinder (14) corresponds to the positioning sleeve (12), the separation ring (15) is arranged in the limiting cylinder (14), the separation ring (15) separates the corresponding limiting cylinder (14) into two cavities, the positioning sleeve (12) is in sliding fit with the outer cavity between the corresponding limiting cylinder (14) and the separation ring (15), the adjusting body (13) is in sliding fit with the inner cavity in the corresponding separation ring (15), the spring (16) is arranged in the limiting cylinder (14), the spring (16) is used for supporting the adjusting body (13) to slide towards the direction close to the workpiece (22), the separation ring (15) is provided with a through hole (17) for connecting the two cavities in the separation ring (15), the positioning sleeve (12) and the adjusting body (13) are provided with a piston (18), the piston (18) is in sliding fit with the corresponding cavity, and the elastic force of the spring (16) is greater than the sum of the frictional forces between the two pistons (18) and the inner walls of the corresponding cavities.

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 bodies (2) are oppositely arranged, one of the positioning bodies (2) has a circular cross section, and the other of the positioning bodies (2) has a rhombic cross section, 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 0.01 mm.

3. The high-precision fixture clamp for repeatedly hoisting workpieces of a numerical control boring machine according to claim 2, characterized in that: The guiding assembly includes guiding plates (5) oppositely arranged on the tool base (1), the guiding plates (5) are detachably arranged on the tool base (1), the guiding plates (5) have guiding portions (51), and the guiding portions (51) are obliquely arranged, and the distance between the two guiding portions (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-walled 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 arranged on the tool base (1), the support rod body (61) is provided with an air channel (7), the air channel (7) is used for communicating with an external air source, a plurality of mounting grooves (8) are arranged on the support rod body (61), a plurality of connecting holes (9) are arranged on 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 arranged on the support block (62), the air outlet holes (10) correspond to the connecting holes (9) in a one-to-one manner, and the air outlet holes (10) are used for being aligned or misaligned 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), which comprises 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.

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