Clamping device for rough machining of screw type air compressor shell

Abstract

The utility model discloses a clamping device for rough machining of a shell of a screw type air compressor, which comprises a heightened tailstock arranged at the tail of a machine tool, positioned at the bottom of a four-axis body of the machine tool and connected with the four-axis body in a locking manner. And the heightened headstock is arranged at the head of the machine tool, is positioned at the bottom of the four-axis body, is opposite to the heightened tailstock and is connected with the four-axis body in a locking manner. And the four-axis bridge plate is arranged between the head part and the tail part of the machine tool, is positioned on the four-axis body and is detachably connected with the four-axis body. The locking structure is arranged on the four-axis bridge plate and fixedly connected with the working face of the four-axis bridge plate, the working portion of the locking structure is detachably connected with the blank shell, preprocessing of three angle faces of 0 degree, 90 degrees and-90 degrees is achieved, the accuracy of the form and location tolerance size with high assembling accuracy is guaranteed, the data uniformity consistency of assembling gaps is improved, and the product quality is improved. The assembly precision of female and male rotors is improved, and the comprehensive performance of products is improved.

Description

Technical Field

[0001] This utility model relates to the field of screw air compressor housing processing technology, and in particular to a clamping device for rough machining of screw air compressor housing. Background Technology

[0002] A screw air compressor is a twin-shaft positive displacement rotary compressor, primarily consisting of two rotors, a main (male) and a secondary (female), meshing together. The teeth of the main and secondary rotors, along with the inner wall of the casing, form a closed basic volume. The clearance between the male and female rotors is a critical parameter, directly affecting the compressor's performance, efficiency, and lifespan. The machining precision of the casing itself, which supports the rotors, is also extremely important. Key parameters include: Sealing: The clearance between the male and female rotors, and between them and the rear end cover and bearings, directly affects the compressor's sealing performance. Excessive clearance increases leakage during compression, reduces the volume of compressed air discharged from the machine, and lowers compression efficiency. Lubrication: Appropriate tolerances ensure good lubrication, allowing lubricating oil to form a film between the rotors and between the rotors and the casing, carrying away heat generated by friction and reducing wear. Operational stability: Improper clearance tolerances can lead to rotor jamming, vibration, and other instability during operation, affecting the compressor's normal operation and lifespan.

[0003] In the existing processing technology, after casting, the shell is hoisted into the machine tool in one go using large equipment, and the machining is completed directly after clamping. Since it is necessary to counteract the influence of the cutting force of the tool during machining, a locking force of about 100 N·m-140 N·m needs to be applied to the fixture. During the machining process, the metal is cut, and the blank allowance is about 5 mm on each side. The removal of material by the tool is actually the process of the workpiece being squeezed and rubbed by the tool, causing elastic deformation and plastic deformation on the surface of the workpiece, and the chips are separated from the parent material.

[0004] During the cutting process, the workpiece is subjected to cutting force, generating cutting heat and causing the cutting temperature to rise. After cutting, residual stress is generated on the machined surface of the workpiece. In actual measurement, it was found that when the fixture was not loosened, the flatness and parallelism of the workpiece tested with a dial indicator met the tolerance requirements of the drawing, for example: flatness test 0.02, drawing flatness 0.05; however, after the fixture was loosened, the product was affected by the internal stress of machining and rebounded and deformed. Coordinate measuring machine inspection revealed that the most critical geometric tolerances affecting assembly were unstable. This instability was an important reason caused by the product deformation. Irregular dimensions exceeding the tolerance did not meet the requirements of the drawing and would affect the assembly of male and female rotors, or even scrap them. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a clamping device for rough machining of screw air compressor housing, which clamps the blank housing of the air compressor on the machine tool by raising the tailstock, raising the headstock, the four-axis bridge plate and the locking structure.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] A clamping device for rough machining of a screw air compressor housing, comprising:

[0008] The raised tailstock is located at the tail of the machine tool, at the bottom of the four-axis body, and is locked to the four-axis body.

[0009] The heightened headstock is located at the head of the machine tool, at the bottom of the four-axis body, opposite to the heightened tailstock, and is locked to the four-axis body.

[0010] The four-axis bridge plate is located between the head and tail of the machine tool, on the four-axis body, and is detachably connected to the four-axis body.

[0011] The locking structure is set on the four-axis bridge plate and is fixedly connected to the working surface of the four-axis bridge plate. Its working part is detachably connected to the blank shell and is used to position, lock and clamp the blank shell in the X, Y and Z directions.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] The heightened tailstock and headstock increase the overall height of the four-axis body to accommodate the height of the four-axis rotary tables on surrounding machine tools. Combined with the connection to the four-axis bridge plate, this allows the locking structure to perform two-point positioning and locking in the X-axis, three-point positioning and locking in the Z-axis, and single-point positioning and locking in the Y-axis. The air compressor blank shell is clamped onto the four-axis bridge plate via point positioning, pre-machining the blank shell as much as possible outside the fixture, enabling pre-machining from three angles: 0°, 90°, and -90°. This effectively solves the problem of the internal stress generated by the cutting tool during machining affecting the final dimensions, ensuring high-precision dimensional and positional tolerances in assembly, improving the uniformity and consistency of assembly clearances, reducing the risk of defects, and improving the accuracy of assembling the male and female rotors, thereby enhancing the overall performance of the product.

[0014] More preferably, the locking structure includes:

[0015] The positioning and locking assembly is set on the four-axis bridge plate and is detachably connected to the four-axis bridge plate and the blank housing. It is used to clamp the blank housing onto the four-axis body from the X, Y and Z directions respectively through positioning and locking, and the blank housing is located in the positioning and locking assembly.

[0016] The support locking assembly is located in the positioning locking assembly and is detachably connected to the four-axis body. It is located at the bottom of the blank housing and abuts against the side wall of the blank housing. The middle bottom wall of the blank housing is clamped in the support locking assembly.

[0017] By employing the above technical solution, the positioning and locking components utilize point positioning and locking modes—two-point positioning in the X direction, single-point positioning in the Y direction, and three-point positioning in the Z direction—to clamp the blank shell from both outer walls and the bottom wall. This ensures that the machine tool cutting tool can be pre-machined from three angular planes: 0°, 90°, and -90°, reducing the impact of internal stress generated by the cutting tool on the final dimensions of the blank shell. The support and locking assembly provides support from the bottom of the blank shell, reducing the load-bearing weight of the positioning and locking assembly in the Z direction, thus assisting the positioning and locking assembly in clamping the blank shell.

[0018] More preferably, the positioning and locking assembly includes:

[0019] The first limiting block is set on the four-axis bridge plate, located on the inner side of the tail of the four-axis body, and is detachably connected to the four-axis bridge plate.

[0020] There are two second limiting blocks, which are detached and connected to the four-axis bridge plate. They are located inside the head of the four-axis body, opposite to the position of the first limiting block, and the two second limiting blocks are arranged in a V-shape.

[0021] Z-axis positioning posts are fixedly installed on the first limiting block and the second limiting block, respectively, with their top walls abutting against the middle outer wall of the blank shell.

[0022] The locking platform is set on both sides of the first limiting block, located on one side of the blank shell, and is detachably connected to the four-axis bridge plate. An X-axis locking member is set on its upper part, which passes through the locking platform and abuts against the outer wall of one side of the blank shell.

[0023] The Y-axis positioning column is detachably connected to the four-axis bridge plate, located in the middle of the other side of the blank housing, and is locked to the outer wall of the other side.

[0024] The X-axis positioning pins are respectively set on both sides of the Y-axis positioning pins and are detachably connected to the four-axis bridge plate. The lower part of the X-axis positioning pins is equipped with Y-axis locking components, which pass through the X-axis positioning pins and are screwed to the Y-axis positioning pins.

[0025] The Z-axis main pressure plate is respectively set on the first limit block and the second limit block, and is locked to the first limit block and the second limit block by bolts. Its end face is in contact with one side wall of the housing.

[0026] The top column is respectively set between the Z-direction main pressure plate and the first limit block and the second limit block. It is locked to the first limit block and the second limit block by bolts and slidably connected to the Z-direction main pressure plate. It is used to limit the position of the Z-direction main pressure plate on the first limit block and the second limit block by sliding.

[0027] Using the above technical solution, the first limiting block, the second limiting block, and the Z-axis positioning column achieve three-point positioning in the Z-axis direction on both outer walls of the blank shell. The cooperation of the Z-axis main pressure plate and the top column achieves three-point locking in the middle of both outer walls. The cooperation of the locking table and the X-axis locking component locks the lower part of the outer wall of the blank shell in the X-axis direction. The cooperation of the Y-axis positioning column, the Y-axis locking component, and the X-axis positioning column achieves positioning and clamping in the X-axis direction. The X-axis positioning column and the second limiting block together limit the position of the blank shell on the four-sided bridge plate. In this way, by using point positioning and locking on both outer walls and the bottom wall of the blank shell, the blank shell is clamped on the four-sided bridge plate, and the pre-processing of the three angle surfaces of 0° / 90° / -90° is fully realized.

[0028] More preferably, the X-axis positioning post includes:

[0029] The first column is located on one side of the Y-axis positioning column, between the second limiting block and the Y-axis positioning column, and is detachably connected to the four-axis body.

[0030] The second column is located on the other side of the Y-axis positioning column and is detachably connected to the four-axis bridge plate. The end of the Y-axis locking member passes through the second column and is threadedly connected to the Y-axis positioning column. The side walls of the first column and the second column respectively contact the bottom side wall of the blank housing.

[0031] By adopting the above technical solution, in the X direction, the lower part of the outer wall of the blank shell is bound together with the X-direction locking member by the first column and the second column, thereby limiting the position of the blank shell in the X direction and playing the role of X-direction limiting and locking.

[0032] Further optimized, the Y-axis positioning post includes:

[0033] The column is detachably connected to the four-axis bridge plate, located between the first column and the second column, and is locked to the Y-axis locking member by threads.

[0034] The clamping block is set in the internal cavity of the column, with its bottom surface in contact with the four-axis bridge plate and a preset distance between it and the column.

[0035] The telescopic component is located between the clamping block and the column, and is fixedly connected to the column and the clamping block respectively. It is used to assist the telescopic clamping block and the column in clamping the middle outer wall of the blank shell.

[0036] The fixing hole is a through hole that runs through the column and the clamping block. It is used to lock and fix the clamping block and the column in the X direction by means of a fastener.

[0037] By adopting the above technical solution, the middle part of the blank shell is placed between the clamping block and the column. By adjusting the spatial distance between the clamping block and the column through the telescopic component, the protruding part of the middle part of the blank shell is clamped, thereby achieving limitation and locking in the Y direction.

[0038] Further optimization involves a protrusion at the top of the Z-axis positioning post, which is fixedly connected to the Z-axis positioning post. The top surface of the protrusion is flat, and the blank shell contacts the protrusion.

[0039] By adopting the above technical solution, during the clamping process, the protrusion contacts the blank shell to perform point positioning in the Z direction, so that the blank shell can accurately fall into the space between the first limiting block and the second limiting block.

[0040] Further optimization results in the following support locking components:

[0041] The support platform is set on the four-axis bridge plate, located at the bottom of the blank shell, and is detachably connected to the four-axis bridge plate.

[0042] The support column is inserted into the support platform and is movably connected to the support platform, with its top surface abutting against the bottom surface of the blank shell.

[0043] The insert rod is installed inside the support platform and is inserted into the support column, with its end extending outside the support platform.

[0044] By adopting the above technical solution, the support platform and the support column together support the bottom of the blank shell, reducing the load on the first limit block and the second limit block, and playing an auxiliary support role.

[0045] Further optimization involves a trapezoidal head on the Z-axis main pressure plate, designed to contact the outer wall of the blank shell.

[0046] By adopting the above technical solution, the contact area with the blank shell is reduced, thereby reducing the impact of clamping external force on the blank shell and ensuring the uniformity of the assembled parts. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of this embodiment.

[0048] Figure 2 This is a schematic diagram of the locking structure in this embodiment.

[0049] Figure 3 This is a schematic diagram of the positioning and locking assembly in this embodiment.

[0050] Figure 4 This is a cross-sectional view of the positioning and locking assembly in this embodiment.

[0051] Figure 5 This is a schematic diagram of the structure supporting the locking assembly in this embodiment.

[0052] Figure 6 This is a schematic diagram of the Y-direction positioning post in this embodiment.

[0053] Figure 7 This is a schematic diagram of the Z-axis main pressure plate in this embodiment.

[0054] Figure 8 This is a schematic diagram of the structure of the column and clamping block in this embodiment.

[0055] Figure 9 This is a schematic diagram of the fixing hole in this embodiment.

[0056] Figure 10 This is a schematic diagram of the clamping block and telescopic component in this embodiment.

[0057] Figure 11 This is a schematic diagram of the structure supporting the locking assembly in this embodiment.

[0058] Reference numerals: 1-Heightened tailstock; 2-Four-axis bridge plate; 3-Locking structure; 31-Positioning and locking assembly; 310-First limiting block; 311-X-direction positioning post; 3111-First column; 3112-Second column; 312-Y-direction positioning post; 3121-Column body; 3122-Clamping block; 3123-Telescopic component; 3124-Fixing hole; 313-Z-direction positioning post; 3131-Protrusion; 314-X-direction locking component; 315-Y-direction locking component; 316-Z-direction main pressure plate; 317-Second limiting block; 318-Locking platform; 319-Top column; 32-Supporting locking assembly; 321-Supporting platform; 322-Supporting column; 323-Insertion rod; 4-Raw shell; 5-Heightened headstock; 6-Four-axis body. Detailed Implementation

[0059] The following is in conjunction with the appendix Figures 1-11 This utility model will be described in further detail.

[0060] A clamping device for rough machining of screw air compressor housing, such as Figure 1 As shown, it includes:

[0061] The raised tailstock 1 is located at the tail of the machine tool, at the bottom of the four-axis body 6, and is locked to the four-axis body 6.

[0062] The heightened headstock 5 is located at the head of the machine tool, at the bottom of the four-axis body 6, opposite to the heightened tailstock 1, and is locked to the four-axis body 6.

[0063] The four-axis bridge plate 2 is located between the head and tail of the machine tool, on the four-axis body 6, and is detachably connected to the four-axis body 6.

[0064] The locking structure 3 is set on the four-axis bridge plate 2 and is fixedly connected to the working surface of the four-axis bridge plate 2. Its working part is detachably connected to the blank shell 4 and is used to position, lock and clamp the blank shell 4 in the X, Y and Z directions.

[0065] The heightened tailstock 1 and headstock 5 increase the height of the four-axis body 6 to accommodate the height of the four-axis rotary tables on surrounding machine tools. Combined with the connection to the four-axis bridge plate 2, the locking structure 3 performs two-point positioning and locking in the X-axis, three-point positioning and locking in the Z-axis, and single-point positioning and locking in the Y-axis. This clamps the air compressor blank shell 4 onto the four-axis bridge plate 2 via point positioning, ensuring that as much of the blank shell 4 as possible is exposed outside the fixture, enabling pre-machining from three angles: 0°, 90°, and -90°. This effectively solves the problem of the influence of internal stress generated by the cutting tool on the final dimensions, ensuring high-precision dimensional and positional tolerances in assembly, improving the uniformity and consistency of assembly clearance data, reducing the risk of defects, and improving the accuracy of assembling the male and female rotors, thereby enhancing the overall performance of the product.

[0066] Specifically, such as Figure 1 and Figure 2 As shown, the locking structure 3 in this embodiment includes:

[0067] The positioning and locking assembly 31 is mounted on the four-axis bridge plate 2 and is detachably connected to the four-axis bridge plate 2 and detachably connected to the blank housing 4. It is used to clamp the blank housing 4 onto the four-axis body 6 from the X, Y and Z directions respectively through positioning and locking, and the blank housing 4 is located in the positioning and locking assembly 31.

[0068] The support locking assembly 32 is disposed in the positioning locking assembly 31 and is detachably connected to the four-axis body 6. It is located at the bottom of the blank housing 4 and abuts against the side wall of the blank housing 4. The middle bottom wall of the blank housing 4 is clamped in the support locking assembly 32.

[0069] By employing point-positioning locking modes—two-point positioning in the X direction, single-point positioning in the Y direction, and three-point positioning in the Z direction—the blank housing 4 can be clamped from its two outer walls and bottom wall. This ensures that the machine tool can be pre-machined from three angles: 0°, 90°, and -90°, reducing the impact of internal stress generated by the tool on the final dimensions of the blank housing 4. The support locking assembly 32 provides support from the bottom of the blank housing 4, reducing the load-bearing weight of the positioning locking assembly 31 in the Z direction and assisting the positioning locking assembly 31 in clamping the blank housing 4.

[0070] Specifically, such as Figure 2 , Figure 3 as well as Figure 4 As shown in this embodiment, the positioning and locking assembly 31 includes:

[0071] The first limiting block 310 is set on the four-axis bridge plate 2, located on the inner side of the tail of the four-axis body 6, and is detachably connected to the four-axis bridge plate 2.

[0072] Two second limiting blocks 317 are detachably connected to the four-axis bridge plate 2, located inside the head of the four-axis body 6, opposite to the first limiting block 310, and arranged in a V-shape. The virtual included angle between the two second limiting blocks 317 is directly opposite the first limiting block 310, thereby locking the outer wall of the support of the blank housing 4 in the X direction.

[0073] Z-direction positioning post 313 is fixedly installed on the first limiting block 310 and the second limiting block 317 respectively. Its top wall abuts against the middle outer wall of the blank shell, so that the blank shell 4 falls between the first limiting block 310 and the second limiting block 317, and is used to position the blank shell 4 in the Z direction from the middle outer wall in a three-point manner.

[0074] Locking platforms 318 are respectively set on both sides of the first limiting block 310, located on one side of the blank housing 4, and are detachably connected to the four-axis bridge plate 2. An X-direction locking member is provided on its upper part. The X-direction locking member passes through the locking platform 318 and abuts against the outer wall of one side of the blank housing 4.

[0075] The Y-direction positioning column 312 is detachably connected to the four-axis bridge plate 2 and is located in the middle of the other side of the blank housing 4. It is locked to the outer wall of the other side and plays the role of positioning and locking in the Y direction.

[0076] X-axis positioning pins 311 are respectively set on both sides of Y-axis positioning pins 312 and are detachably connected to the four-axis bridge plate 2. A Y-axis locking member is provided at the bottom of the pin. The Y-axis locking member passes through the X-axis positioning pins 311 and is screwed to the Y-axis positioning pins 312, which plays a positioning role for the bottom of the blank housing 4 in the X direction.

[0077] The Z-direction main pressure plate 316 is respectively set on the first limiting block 310 and the second limiting block 317, and is locked to the first limiting block 310 and the second limiting block 317 by bolts. Its end face is in contact with one side wall of the shell, and assists the X-direction positioning column 311 in clamping the blank shell 4.

[0078] The top column 319 is respectively set between the Z-direction main pressure plate 316 and the first limiting block 310 and the second limiting block 317. It is bolted to the first limiting block 310 and the second limiting block 317 and slidably connected to the Z-direction main pressure plate 316. It is used to limit the position of the Z-direction main pressure plate 316 on the first limiting block 310 and the second limiting block 317 by sliding.

[0079] The first limit block, the second limit block 317, and the Z-axis positioning post 313 achieve three-point positioning in the Z-axis direction on both outer walls of the blank shell 4. The cooperation of the Z-axis main pressure plate 316 and the top post 319 achieves three-point locking in the middle of both outer walls. The locking table 318 and the X-axis locking member cooperate to lock the lower part of the outer wall of the blank shell 4 in the X-axis direction. The Y-axis positioning post 312, the Y-axis locking member, and the X-axis positioning post 311 cooperate to achieve positioning and clamping in the X-axis direction. The X-axis positioning post 311 and the second limit block 317 together limit the position of the blank shell 4 on the surrounding bridge plate. In this way, by using point positioning and locking on both outer walls and the bottom wall of the blank shell 4, the blank shell 4 is clamped on the surrounding bridge plate, and the pre-processing of the three angle surfaces of 0° / 90° / -90° is fully realized.

[0080] Specifically, such as Figure 3 , Figure 5 as well as Figure 6 As shown, in this embodiment, the X-direction positioning post 311 includes:

[0081] The first column 3111 is located on one side of the Y-direction positioning column 312, between the second limiting block 317 and the Y-direction positioning column 312, and is detachably connected to the four-axis body 6.

[0082] The second column 3112 is located on the other side of the Y-direction positioning column 312 and is detachably connected to the four-axis bridge plate 2. The end of the Y-direction locking member passes through the second column 3112 and is threadedly connected to the Y-direction positioning column 312. The side wall of the first column 3111 and the side wall of the second column 3112 are in contact with the bottom side wall of the blank housing 4, respectively.

[0083] In the X direction, the lower part of the outer wall of the blank shell 4 is bound together with the X-direction locking member by the first column 3111 and the second column 3112, thereby limiting the position of the blank shell 4 in the X direction and playing the role of X-direction limiting and locking.

[0084] Specifically, such as Figure 3 , Figure 5 , Figure 8 , Figure 9 as well as Figure 10 As shown, in this embodiment, the Y-direction positioning post 312 includes:

[0085] The column 3121 is detachably connected to the four-axis bridge plate 2, located between the first column 3111 and the second column 3112, and is locked to the Y-axis locking member by threads.

[0086] The clamping block 3122 is set in the internal cavity of the column 3121, and its bottom surface contacts the four-axis bridge plate 2. There is a preset distance between the clamping block 3122 and the column 3121.

[0087] The telescopic component 3123 is disposed between the clamping block 3122 and the column 3121, and is fixedly connected to the column 3121 and the clamping block 3122 respectively. It is used to clamp the middle outer wall of the blank shell 4 through the telescopic auxiliary clamping block 3122 and the column 3121.

[0088] The fixing hole 3124 is a through hole that passes through the column 3121 and the clamping block 3122. It is used to lock and fix the clamping block 3122 and the column 3121 in the X direction by means of a fastener.

[0089] The middle part of the blank shell is placed between the clamping block 3122 and the column 3121. By adjusting the spatial distance between the clamping block 3122 and the column 3121 through the telescopic member 3123, the protruding part of the middle part of the blank shell 4 is clamped, thereby achieving limitation and locking in the Y direction.

[0090] Specifically, such as Figure 3 and Figure 4 As shown, in this embodiment, the top of the Z-direction positioning post 313 is provided with a protrusion, which is fixedly connected to the Z-direction positioning post 313. The top surface of the protrusion is a plane, and the blank shell 4 contacts the protrusion. During the clamping process, the protrusion contacts the blank shell 4, and point positioning is performed in the Z direction, so that the blank shell 4 can accurately fall into the space between the first limiting block 310 and the second limiting block 317.

[0091] Specifically, such as Figure 4 , Figure 5 as well as Figure 11 As shown, in this embodiment, the supporting locking assembly 32 includes:

[0092] The support platform 321 is set on the four-axis bridge plate 2, located at the bottom of the blank housing 4, and is detachably connected to the four-axis bridge plate 2.

[0093] The support column 322 is inserted into the support platform 321 and is movably connected to the support platform 321. Its top surface abuts against the bottom surface of the blank shell 4.

[0094] The insertion rod 323 is installed inside the support platform 321 and is inserted into the support column 322, with its end extending out of the support platform 321.

[0095] The support platform 321 and the support column 322 together support the bottom of the blank shell 4, reducing the load on the first limit block 310 and the second limit block, and playing an auxiliary support role.

[0096] Specifically, such as Figure 5 , Figure 6 as well as Figure 7As shown, in this embodiment, the head of the Z-direction main pressure plate 316 is trapezoidal, which is used to contact the outer wall of the blank shell 4, reduce the contact area with the blank shell 4, reduce the influence of the clamping external force on the blank shell 4, and ensure the uniformity of the assembly.

[0097] A method for a rough machining clamping device for a screw air compressor housing, comprising: clamping a rough housing onto the clamping device by point positioning and locking; and including:

[0098] The S901 locks the raised tailstock 1, raised headstock 5, and quadcopter body 6 together.

[0099] S902 positions and locks the blank housing 4 onto the four-axis bridge plate 2 via X, Y, and Z directions.

[0100] First, raise the height of the four-axis body 6 to match the height of the four-axis turntable. Then, by point positioning and locking from the X, Y, and Z directions respectively, clamp the blank shell 4 to achieve pre-processing from the three angle surfaces of 0° / 90° / -90° respectively.

[0101] Specifically, in this embodiment, S902 positions and locks the blank housing 4 onto the four-axis bridge plate 2 via X, Y, and Z directions, including:

[0102] S1001 is placed into the blank shell 4 and placed on the Z-axis positioning post 313 for three-point positioning in the Z-axis.

[0103] S1002 pushes the blank housing 4 to the side, so that it rests against the X-direction positioning post 311, and the X-direction locking member passes through the locking table 318 and abuts against the bottom outer wall of the blank housing 4.

[0104] S1003 pushes the blank housing 4 to the side, so that it rests against the Y-direction positioning post 312, and puts the outer wall of the blank housing 4 between the clamping block 3122 and the post 3121, and puts the Y-direction locking member through the second post 3112 and the post 3121 and into contact with the clamping block 3122.

[0105] S1004 locks the X-direction locking component, Y-direction locking component, and Z-direction main pressure plate 316 respectively for positioning and locking.

[0106] S1005 inserts the rod 323 into the support platform 321, so that it passes through the support column 322 and abuts against the inner wall of the support platform 321, locking the support locking assembly 32 for auxiliary support.

[0107] The air compressor blank shell 4 is clamped onto the four-axis bridge plate 2 by point positioning and locking from two points in the X direction, three points in the Z direction, and one point in the Y direction. Pre-processing is carried out on three angle surfaces: 0°, 90°, and -90°. The processing procedure is changed from a one-time overall processing to a staged processing to meet the different precision requirements in the drawings. This ensures that after precision machining, the product's measurement data is basically consistent with the in-machine measurement, the form and position tolerance error is reduced, the overall accuracy is stable, the defect rate is reduced, and the assembly accuracy is improved.

[0108] Please combine Figures 1-11 The process of clamping the blank shell 4 in this embodiment is described as follows:

[0109] First, the raised tailstock 1, the raised headstock 5, and the four-axis body 6 are connected together by bolts. The various components of the locking structure 3 are fixedly installed on the four-axis bridge plate 2.

[0110] Positioning and locking:

[0111] Place it between the blank shell 4 and the first limiting block 310 and the second limiting block 317, such as Figure 3 , Figure 5 as well as Figure 6 As shown, the outer wall of the middle part of the blank shell 4 is brought into contact with three Z-direction positioning posts 313, and three-point positioning in the Z direction is performed on the first limiting block 310 and the second limiting block 317. Three-point positioning has the following characteristics: stability – three points not on the same straight line can determine a plane, thus ensuring the stability and uniqueness of the blank shell 4 on that plane, effectively preventing unnecessary movement or rotation of the blank shell 4 during processing, and improving processing accuracy; flexibility – three-point positioning can flexibly select positioning points according to the specific shape of the blank shell 4 and processing requirements, applicable to blank shells 4 of various shapes and sizes, improving the versatility of the equipment; ease of adjustment – ​​due to the fewer positioning points, adjusting positioning parameters is relatively easy, especially when performing repeated processing, the Z-direction positioning posts 313 can be quickly adjusted to adapt to different processing requirements; reduced interference – three-point positioning reduces the contact area between the Z-direction positioning posts 313 and the blank shell 4, reducing the risk of interference, which is particularly important in the processing of complex-shaped workpieces. In summary, three-point positioning is widely used in various processing applications in the machinery industry due to its advantages in stability, simplified design, flexibility, ease of adjustment, and reduced interference.

[0112] The three points between the first limiting block 310 and the second limiting block 317 are arranged in an isosceles triangle. Since the first limiting block 310 is located in the middle of the two points of the second limiting block 317, the deformation of the blank shell 4 during the casting process can be evenly distributed at both ends of the second limiting block 317. This allows for reasonable control of the allowance from the machining surface to the blank shell 4, avoiding overcutting or undercutting by the tool, thus eliminating the risk of defects and improving the pass rate.

[0113] The blank housing 4 is pushed to the side so that it rests against the X-direction positioning post 311. One side wall of the blank housing 4 abuts against the side walls of the first post 3111 and the second post 3112. The X-direction locking member passes through the locking table 318 and abuts against the bottom outer wall of the blank housing 4 to position the blank housing 4 in the X direction.

[0114] The blank shell 4 is pushed to the side so that it rests against the Y-direction positioning post 312. The clamping block 3122 is moved to drive the telescopic member 3123 to extend, so that the bottom middle part of the blank shell 4 falls between the clamping block 3122 and the post 3121. The telescopic member 3123 drives the clamping block 3122 to move in the opposite direction until it contacts the blank shell 4, clamping the blank shell 4 between the clamping block 3122 and the post 3121, thereby achieving the positioning of the blank shell 4 in the Y direction.

[0115] The Y-direction locking member is passed through the second column 3112 and the column body 3121 and inserted into the clamping block 3122. The Y-direction locking member is tightened to lock the bottom of the blank shell 4 from the Y direction.

[0116] The X-direction locking member 314 passes through the locking table 318 and abuts against the other side wall of the blank housing 4 to lock the X-direction locking member and lock the blank housing 4 in the X direction.

[0117] By adjusting the bolts on the top column 319 and the bolts on the Z-direction main pressure plate 316, the distance between the Z-direction main pressure plate 316 and the first limiting block 310 and the second limiting block 317 can be adjusted. The Z-direction main pressure plate 316 is then adjusted by adjusting the bolts so that its end face contacts the middle outer wall of the blank shell 4. The bolts on the Z-direction main pressure plate 316 are then tightened, so that the Z-direction main pressure plate 316 on the first limiting block 310 and the second limiting block 317 is locked at three points, thus locking in the Z direction.

[0118] In summary, this embodiment first follows the ZXY positioning method for the air compressor blank shell 4, and then follows the YXZ locking sequence, to achieve point positioning and point locking in the X, Y, and Z directions, so that the positioning point, locking point, and locking force remain unchanged. The blank shell 4 is changed from being machined as a whole in one go to being machined in stages from three angle surfaces of 0° / 90° / -90°. After natural aging treatment, the internal stress of the tool can be further eliminated.

[0119] This specific embodiment is merely an explanation of the utility model and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of protection of this utility model.

Claims

1. A clamping device for rough machining of a screw air compressor housing, characterized in that, include: The raised tailstock (1) is set at the tail of the machine tool, located at the bottom of the four-axis body (6) of the machine tool, and is locked to the four-axis body (6); The heightened headstock (5) is set at the head of the machine tool, located at the bottom of the four-axis body (6), opposite to the heightened tailstock (1), and locked to the four-axis body (6); The four-axis bridge plate (2) is set between the head and tail of the machine tool, located on the four-axis body (6), and is detachably connected to the four-axis body (6); The locking structure (3) is set on the four-axis bridge plate (2) and fixedly connected to the working surface of the four-axis bridge plate (2). Its working part is detachably connected to the blank shell (4) and is used to position, lock and clamp the blank shell (4) in the X, Y and Z directions.

2. The clamping device for rough machining of screw air compressor housing according to claim 1, characterized in that, The locking structure (3) includes: The positioning and locking assembly (31) is disposed on the four-axis bridge plate (2), detachably connected to the four-axis bridge plate (2), and detachably connected to the blank housing (4). It is used to clamp the blank housing (4) on the four-axis body (6) from the X, Y, and Z directions respectively through positioning and locking, and the blank housing (4) is located in the positioning and locking assembly (31). The support locking assembly (32) is disposed in the positioning locking assembly (31), is detachably connected to the four-axis body (6), is located at the bottom of the blank housing (4), abuts against the side wall of the blank housing (4), and the middle bottom wall of the blank housing (4) is clamped in the support locking assembly (32).

3. The clamping device for rough machining of screw air compressor housing according to claim 2, characterized in that, The positioning and locking assembly (31) includes: The first limiting block (310) is disposed on the four-axis bridge plate (2), located on the inner side of the tail of the four-axis body (6), and is detachably connected to the four-axis bridge plate (2); The second limiting block (317) consists of two blocks, which are detachably connected to the four-axis bridge plate (2) and located inside the head of the four-axis body (6), opposite to the position of the first limiting block (310). The two second limiting blocks (317) are arranged in a V-shape. Z-direction positioning post (313) is fixedly installed on the first limiting block (310) and the second limiting block (317), respectively, and its top wall abuts against the middle outer wall of the blank shell (4); Locking platforms (318) are respectively set on both sides of the first limiting block (310), located on one side of the blank housing (4), and detachably connected to the four-axis bridge plate (2). An X-direction locking member (314) is provided on its upper part. The X-direction locking member (314) passes through the locking platform (318) and abuts against one side of the outer wall of the blank housing (4). The Y-axis positioning column (312) is detachably connected to the four-axis bridge plate (2), located in the middle of the other side of the blank housing (4), and locked to the outer wall of the other side. X-axis positioning pins (311) are respectively set on both sides of the Y-axis positioning pin (312) and are detachably connected to the four-axis bridge plate (2). A Y-axis locking member (315) is provided at the lower part of the X-axis positioning pin (311) and is screwed to the Y-axis positioning pin (312). The Z-direction main pressure plate (316) is respectively set on the first limiting block (310) and the second limiting block (317), and is locked to the first limiting block (310) and the second limiting block (317) by bolts. Its end face is in contact with one side wall of the blank shell (4). The top column (319) is respectively disposed between the Z-direction main pressure plate (316) and the first limiting block (310) and the second limiting block (317), and is bolted to the first limiting block (310) and the second limiting block (317), and is slidably connected to the Z-direction main pressure plate (316), and is used to limit the position of the Z-direction main pressure plate (316) on the first limiting block (310) and the second limiting block (317) by sliding.

4. The clamping device for rough machining of screw air compressor housing according to claim 3, characterized in that, The X-direction positioning post (311) includes: The first column (3111) is located on one side of the Y-direction positioning column (312), between the second limiting block (317) and the Y-direction positioning column (312), and is detachably connected to the four-axis body (6). The second column (3112) is located on the other side of the Y-direction positioning column (312) and is detachably connected to the four-axis bridge plate (2). The end of the Y-direction locking member (315) passes through the second column (3112) and is threadedly connected to the Y-direction positioning column (312). The side wall of the first column (3111) and the side wall of the second column (3112) respectively contact the bottom side wall of the blank housing (4).

5. The clamping device for rough machining of screw air compressor housing according to claim 4, characterized in that, The Y-direction positioning post (312) includes: The column (3121) is detachably connected to the four-axis bridge plate (2), located between the first column (3111) and the second column (3112), and is threadedly locked to the Y-direction locking member (315); The clamping block (3122) is disposed in the internal cavity of the column (3121), and its bottom surface contacts the four-axis bridge plate (2) and there is a preset distance between it and the column (3121); Telescopic component (3123) is disposed between the clamping block (3122) and the column (3121), and is fixedly connected to the column (3121) and the clamping block (3122) respectively, for assisting the clamping block (3122) and the column (3121) in clamping the middle outer wall of the blank shell (4) by telescopic assistance; The fixing hole (3124) is a through hole that passes through the column (3121) and the clamping block (3122) and is used to lock and fix the clamping block (3122) and the column (3121) in the X direction by means of a fixing member.

6. The clamping device for rough machining of screw air compressor housing according to claim 3, characterized in that, The top of the Z-direction positioning post (313) is provided with a protrusion (3131), the protrusion (3131) is fixedly connected to the Z-direction positioning post (313), the top surface of the protrusion (3131) is a plane, and the blank shell (4) is in contact with the protrusion (3131).

7. The clamping device for rough machining of screw air compressor housing according to claim 5, characterized in that, The support locking assembly (32) includes: A support platform (321) is provided on the four-axis bridge plate (2), located at the bottom of the blank housing (4), and is detachably connected to the four-axis bridge plate (2); A support column (322) is inserted into the support platform (321) and is movably connected to the support platform (321), with its top surface abutting against the bottom surface of the blank shell (4); The insertion rod (323) is disposed inside the support platform (321) and is inserted into the support column (322), with its end extending outside the support platform (321).

8. The clamping device for rough machining of screw air compressor housing according to claim 5, characterized in that, The head of the Z-direction main pressure plate (316) is trapezoidal and is used to contact the outer wall of the blank shell (4).

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