CN114160849A - Novel special machine tool for vortex disc and machining method thereof - Google Patents

Abstract

The invention discloses a novel special machine tool for a vortex disc and a processing method thereof. The workbench and the clamp module are integrally connected with the double-shaft cutter module through a connecting piece on the cutter moving module to form a coating type, and the cooling and lubricating system is arranged in the whole machine tool. The cutter motion module realizes linear feeding motion of the cutter holder in the up-down front-back direction, the cooling and lubricating system is responsible for the circulating action of cutting fluid and lubricating fluid of the whole machine tool, the double-shaft cutter module realizes the rotary motion of a milling cutter, and the workbench and the clamp module realize the rotation of the workbench and the clamping of a workpiece.

Description

Novel special machine tool for vortex disc and machining method thereof

Technical Field

The invention relates to a novel machine tool special for a scroll disk and a processing method thereof, in particular to the processing of a thin-wall spiral scroll disk in a compressor.

Background

In recent years, with the rapid development of the fields of food, chemical industry, medical health and the like, the application of the turbo compressor is more and more extensive, and the scroll disk is used as a core component of the turbo compressor, so that the market demand is huge.

The requirements on machining precision and action tolerance of a scroll are high, and at present, a machining center is mostly adopted for machining the scroll, wherein L2 vertical machining is the most common machining mode. However, due to the limitation of machine tool design, the machining modes adopt a workbench X/Y axis interpolation method for machining and production. Because the spiral surface of the scroll plate has a complex shape, the error generated when the processing mode passes through a quadrant is easy to cause strip defects of the processing surface, and subsequent matching detection and finish machining are needed to make up the processing defects so as to meet the use requirements. In addition, most of the prior scroll disk processing machines need more parts to process a spiral track due to the limitation of a processing method, so that the main shaft has large suspension and unstable stress, and suspension deviation compensation needs to be added, thereby reducing the processing precision. The vortex disc needs reasonable design of a tool clamp to ensure the stability of the machining process due to the irregular shape of the spiral surface of the vortex disc and the thin-wall structure of the bottom edge.

At present, a novel special scroll machine tool which can adopt a brand-new processing principle and can solve the processing problem is urgently needed in the market.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a novel special machine tool for a scroll disk and a processing method thereof.

The invention firstly provides a novel special scroll disk machine tool, which comprises a cutter motion module, a cooling and lubricating system, a double-shaft cutter module, a workbench and a clamp module; the workbench, the clamp module, the cutter moving module and the double-shaft cutter module form a coating type integral connection, and the cooling and lubricating system is arranged in the whole machine tool; the cooling and lubricating system is positioned in the machine tool and provides circulation of cutting fluid and lubricating fluid for the whole machine tool;

the cutter movement module comprises an x-axis linear motor module, a z-axis linear motor module, a side wall connecting block and a main shaft connecting block;

the double-shaft cutter module comprises a cutter holder, a double-shaft motor, double milling cutters and a central spindle;

the workbench and clamp module comprises an edge locking clamp, an edge clamp, a side clamp and a workbench, wherein the edge locking clamp comprises a plurality of locking fasteners for locking the edge clamp and the side clamp; the edge clamp comprises a clamping claw, an elastic pad, a clamping nut, a clamping screw and a locking fastener; the side clamp comprises a self-centering chuck and a clamping jaw;

the two side wall connecting blocks are positioned on the left side and the right side of the lower part of the cutter moving module, x-axis linear motor modules are arranged on the two side wall connecting blocks, the left end and the right end of the main shaft connecting block are respectively arranged on one x-axis linear motor module, the main shaft connecting block is movably connected with the two side wall connecting blocks, and two z-axis linear motor modules are arranged on the main shaft connecting block; the cutter spindle module is movably connected with the spindle connecting block through a z-axis linear motor module;

the double-shaft motor is embedded in the tool apron, and the double-shaft motor extends out of the two shafts in the same direction and is respectively connected with the two milling cutters; the tool apron is arranged on the guide rail sliding blocks of the two Z-axis linear motor modules to realize movable connection of the Z axis;

a motor is embedded in the workbench and fixedly connected with the machine tool body, an edge locking clamp, an edge clamp and a side clamp are fixedly connected to the workbench, and a workpiece is clamped on the clamps; in the side surface clamp, a self-centering chuck is buckled with the side surface of the lower part of a workpiece through clamping claws, in the edge clamp, two ends of a clamping nut are respectively connected with a left clamping claw and a right clamping claw, an elastic pad is embedded in the clamping side of each clamping claw, a clamping screw is a locking rod with a thread and can rotate, the two ends of the clamping screw and the two ends of the clamping nut are matched through threads, when the clamping screw rotates, the two ends of the clamping nut respectively drive the left clamping claw and the right clamping claw to perform locking or loosening actions, the locking fastener is provided with a screw seat and a vertical screw matched with the screw seat in a threaded manner, and the screw can move up and down relative to the screw seat by rotating the screw; when the edge clamp and the side clamp are required to be locked, the locking fasteners are buckled on the outer sides of the edge clamp and the side clamp, the edge clamp and the side clamp are positioned in the middle of the screw rod seat, the vertical screw rod is rotated to move downwards, and the lower end surface of the screw rod and the screw rod seat clamp the upper surface and the lower surface of the edge clamp and the side clamp.

Preferably, the side wall connecting block and the spindle connecting block surround the workbench, the clamp module and the tool spindle module, so that the tool spindle module and the workpiece are connected into a whole in a working area, the tool spindle module and the connecting support member have no axial deviation, a zero-suspension structure is formed, and a rib plate structure is arranged on the spindle connecting block.

Preferably, the two milling cutters make linear feeding motion from the initial end of the scroll disc to the circle center, the workpiece makes fixed-shaft rotary motion, and the spiral track processing path of the scroll disc is realized by superposition of two simple motions and reasonable speed adjustment of the two simple motions.

Preferably, the center distance between the two milling cutters can be adjusted according to the wall thickness of the machined part, the cutting edges of the two milling cutters are opposite in the clockwise and anticlockwise directions, and the machining length of the milling cutters is larger than the length to be machined of the side face of the scroll.

Preferably, the axis of the central spindle and the guide rail sliding blocks of the two z-axis linear motor modules are on the same vertical plane, and the feeding force is directly transmitted to the tool apron through the sliding blocks.

Preferably, the shape of the clamping claw can be attached to the spiral round side surface of the outer side of the workpiece, and the clamping claw is attached to the outer side surface of the workpiece scroll through the tail end elastic pad.

Preferably, the self-centering chuck is a three-jaw self-centering chuck, and the number of the clamping jaws is three, and the clamping jaws are arranged at intervals of 120 degrees.

The invention also provides a processing method of the novel special scroll disk machine tool, which comprises the following steps:

1) the side surface of a disc at the lower end of a workpiece is clamped in a self-centering manner by adjusting clamping claws of a self-centering chuck, then a screw is rotated, and clamping claws at two sides are driven by a nut seat to surround and clamp the outer side surface of a scroll of the workpiece;

2) the clamping claw is tightly attached to the outer side face of the workpiece vortex disc through a tail end elastic pad, the elastic pad can relieve the impact effect caused by thermal deformation in the workpiece thin-wall machining process, and after clamping is finished, the edge clamp and the side clamp are locked through a locking fastener on the circumference;

3) after the workpiece is clamped, the motor drives the workbench and the workpiece to rotate, meanwhile, the x-axis linear motor module is started to realize the feed motion of the tool apron in the x-axis direction, and the z-axis linear motor module is started to realize the feed and retreat motion of the tool apron in the z-axis direction;

4) the two milling cutters form a double milling cutter structure, the double milling cutters perform linear feed motion from the starting end of the scroll disk to the circle center, the outer cutters of the double milling cutters process the outer side surface of the scroll disk, the inner cutters process the inner side surface, and most of processing stress of the two cutters can be mutually offset; because the length of the milling cutter is greater than the length to be processed of the scroll disc, the inner surface and the outer surface of the scroll disc can be processed at one time under the conditions that the cutter is fed linearly without reversing and the working table rotates in a non-reversing way;

5) and the cooling and lubricating system adds cutting fluid to the workpiece in the machining process and cools and lubricates various parts of the machine tool.

The invention can realize one-time processing of the inner and outer spiral surfaces of the vortex disc under the conditions that the cutter does not perform reversing linear feeding and the working table does not rotate in the same direction, solves the problems of over-quadrant errors in the central cross interpolation of the vortex disc processed by the traditional processing center and the complex processing procedure of repeated feeding of the inner and outer surfaces in times in the traditional processing, and greatly improves the production precision and the production efficiency. In addition, the design of a zero-suspension structure ensures that deviation compensation is not needed in the processing process, and the processing error is reduced. The design of the rib plate structure increases the strength while reducing the mass, improves the stability of the motion of the tool apron and reduces the load of the linear motor. The linear motor enables the machine tool to move more accurately and rapidly compared with a common thread transmission machine tool, thereby improving the machining precision and the machining efficiency. The guide rail sliding blocks of the central spindle and the z-axis linear motor module are on the same plane, and when the machining is carried out, the feeding force is directly transmitted to the cutter holder through the sliding blocks, so that the eccentric moment can not be generated, the stress is more stable, and the machining reliability is improved. The reliability of clamping is improved by double fixing and clamping of the side face and the edge of the workpiece. The double-sided machining enables the machining stress to be offset, and therefore machining deformation is reduced.

Drawings

FIG. 1 is a general schematic view of the novel scroll special machine tool of the invention;

FIG. 2 is a schematic diagram of the novel special scroll machine tool movement module of the invention;

FIG. 3 is a schematic view of the zero overhang structure of the novel special scroll machine tool of the invention;

FIG. 4 is a schematic view of a dual-axis cutter module of the novel special scroll machine tool of the invention;

FIG. 5 is an integrated schematic view of the main shaft guide rail of the novel special scroll machine tool of the invention;

FIG. 6 is a schematic view of the novel scroll plate special machine tool workbench and clamp module of the invention;

FIG. 7 is a schematic view of a workpiece to be machined of the novel special scroll machine tool of the invention;

FIG. 8 is a schematic view of the self-centering side clamping of the novel special scroll disk machine tool;

FIG. 9 is a schematic view of the edge clamping of the novel special machine tool for the vortex disc of the invention;

FIG. 10 is a schematic view of edge clamping and locking of the novel special machine tool for the vortex disc;

in the figure, a tool motion module 1, a cooling and lubricating system 2, a biaxial tool module 3, a workbench and clamp module 4, an x-axis linear motor module 11, a z-axis linear motor module 12, a side wall connecting block 13, a spindle connecting block 14, a tool apron 31, a biaxial motor 32, a double milling cutter 33, a central spindle 34, a workpiece 41, an edge locking clamp 42, an edge clamp 43, a side clamp 44, a workbench 45, a clamping claw 431, an elastic pad 432, a clamping nut 433, a clamping screw 434, a locking fastener 435, a self-centering chuck 441, and a clamping claw 442 are shown.

Detailed Description

As shown in fig. 1, the novel special scroll machine tool comprises a tool moving module 1, a cooling and lubricating system 2, a double-shaft tool module 3, and a workbench and clamp module 4. The workbench and clamp module 4 and the double-shaft cutter module 3 form a coating type integral connection through a connecting piece on the cutter moving module 1, and the cooling and lubricating system 2 is arranged in the whole machine tool. The tool motion module 1 realizes linear feed motion of the tool apron in the up-down front-back direction, the cooling and lubricating system 2 is responsible for the circulating action of cutting fluid and lubricating fluid of the whole machine tool, the double-shaft tool module 3 realizes the rotary motion of the milling cutter, and the workbench and the clamp module 4 realize the rotation of the workbench and the clamping of a workpiece.

As shown in fig. 2, the tool moving module 1 includes an x-axis linear motor module 11, a z-axis linear motor module 12, a side wall connecting block 13, and a spindle connecting block 14. Two lateral wall connecting blocks 13 are located the left and right sides of the lower part of cutter motion module 1, all are provided with x axle linear motor module 11 on two lateral wall connecting blocks 13, and spindle connection block 14 respectively sets up on an x axle linear motor module 11 in both ends about, but swing joint between spindle connection block 14 and two lateral wall connecting blocks 13, and z axle linear motor module 12 has two, all sets up on spindle connection block 14. Two side wall connecting blocks 13 are fixedly connected with a driving motor of the workbench and clamp module 4, and the cutter spindle module 3 is movably connected with a spindle connecting block 14 through a z-axis linear motor module 12.

As shown in fig. 3, the two side wall connecting blocks 13 and the spindle connecting block 14 enclose the worktable and fixture module 4 and the biaxial tool module 3, so that the working areas of the tool and the workpiece are connected into a whole, the tool spindle is compact in design, and shows no axial deviation with the connecting support member in a forward view, and is on the same horizontal line, thereby realizing a zero-overhang structure, avoiding the need of deviation compensation and reducing the processing error. During operation, the feeding motion of blade holder x axle ascending is realized to x axle linear electric motor module 11, and the advancing and retreating sword motion of blade holder z axle ascending is realized to z axle linear electric motor module 12, has arranged the floor structure on the spindle connection piece 14, has increased intensity when lightening the quality, has improved the stability of blade holder motion, has alleviateed linear electric motor's load. The use of the linear motor enables the machine tool to move more accurately and rapidly compared with a common thread transmission machine tool. Thereby improving the processing precision and the processing efficiency.

As shown in fig. 4, the double-shaft cutter module 3 includes a cutter holder 31, a double-shaft motor 32, two milling cutters 33, and a central spindle 34, wherein the double-shaft motor 32 is embedded in the cutter holder 31, and the double-shaft motor 32 extends out of the two shafts in the same direction and is respectively connected with the two milling cutters 33. The center distance of the two milling cutters 33 can be adjusted according to the wall thickness of the processed part, and because the processing directions of the inner wall and the outer wall are opposite, the cutting edges of the two milling cutters are opposite in the forward and reverse directions, and the processing length of the two milling cutters is longer than the length to be processed of the side surface of the scroll. As shown in fig. 5, the tool apron 31 is disposed on the rail blocks of the two Z-axis linear motor modules 12 to realize the movable connection of the Z-axis, the axis of the central spindle 34 and the rail blocks of the two Z-axis linear motor modules 12 are on the same vertical plane, and during machining, the feeding force is directly transmitted to the tool apron 31 through the blocks without generating an eccentric moment, so that the stress is more stable, and the machining reliability is improved.

As shown in fig. 6, the table and clamp module 4 includes an edge locking clamp 42, an edge clamp 43, a side clamp 44, and a table 45. Wherein, the edge locking clamp 42 comprises a plurality of locking fasteners 421 for locking the edge clamp 43 and the side clamp 44; the edge clamp 43 comprises a clamping claw 431, an elastic pad 432, a clamping nut 433, a clamping screw 434 and a locking fastener 435; the side clamp 44 comprises a self-centering chuck 441, clamping jaws 442; the motor is embedded in the workbench 45 and fixedly connected with the machine tool body, the edge locking clamp 42, the edge clamp 43 and the side clamp 44 are fixedly connected to the workbench 45, and the clamp clamps the workpiece 41. In the side surface clamp 44, the self-centering chuck 441 is buckled with the side surface of the lower part of a workpiece through clamping claws 442, in the edge clamp 43, two ends of a clamping nut 433 are respectively connected with a left clamping claw 431 and a right clamping claw 431, the clamping side of the clamping claw 431 is embedded with an elastic pad 432, a clamping screw 434 is a locking rod with a thread capable of rotating, the two ends of the clamping screw 434 and the two ends of the clamping nut 433 are in threaded fit, when the clamping screw 434 rotates, the two ends of the clamping nut 433 respectively drive the left clamping claw 431 and the right clamping claw 431 to perform locking or loosening actions, the locking fastener 421 is provided with a screw seat and a vertical screw in threaded fit with the screw seat, and the screw can move up and down relative to the screw seat by rotating the screw; when locking is needed, a plurality of locking fasteners are buckled on the outer sides of the edge clamp 43 and the side clamp 44, the edge clamp 43 and the side clamp 44 are positioned in the middle of the screw rod seat, the vertical screw rod is rotated to move downwards, and the lower end surface of the screw rod and the screw rod seat clamp the upper surface and the lower surface of the edge clamp 43 and the side clamp 44. In this embodiment, the self-centering chuck 441 is a three-jaw self-centering chuck, and three clamping jaws 442 are provided at 120 ° intervals.

As shown in fig. 7, the machined surface of the workpiece is the inner and outer side surfaces of the helicoid. As shown in fig. 9, gripping fingers 431 may be shaped to conform to the outer, spiral, rounded side of the workpiece. During operation, as shown in fig. 8, the side surface of a disc at the lower end of a workpiece is clamped by adjusting three clamping claws 442 of a three-claw self-centering chuck 441 in a self-centering manner, then a screw 434 is rotated, as shown in fig. 9, clamping nuts 433 drive clamping claws 431 at two sides to surround and clamp the outer side surface of a workpiece scroll, the clamping claws 431 are attached to the outer side surface of the workpiece scroll through a tail end elastic pad 432, and the elastic pad 432 can relieve an impact effect caused by thermal deformation in the workpiece thin-wall machining process. After clamping, the edge clamp 43 and the side clamp 44 are locked by the locking fastener 421 on the circumference, in this embodiment, the locking fastener 421 is a clamp having a threaded rod and an internal threaded seat matched with the threaded rod, and the threaded rod is moved up and down by rotating the threaded rod, so as to clamp the edges of the locking edge clamp 43 and the side clamp 44. After the workpiece is clamped, the motor drives the working table 45 and the workpiece 41 to rotate together, as shown in fig. 6, the two milling cutters form a double milling cutter, the double milling cutter performs linear feeding motion towards the circle center from the starting end of the scroll, the workpiece performs fixed-axis rotating motion, spiral track walking of the scroll is realized by superposition of two simple motions and reasonable speed adjustment of the two simple motions, the outer milling cutter of the double milling cutter processes the outer side surface of the scroll, the inner milling cutter processes the inner side surface, most of processing stress of the two simple motions can be mutually counteracted, thereby reducing processing deformation of a thin-wall part, as the length of the milling cutter is larger than the length to be processed of the scroll, namely the processing range of the milling cutter can cover the processing length, the inner and outer surfaces of the scroll can be processed at one time under the conditions that the cutters perform linear feeding without reversing and the working table does not change to the rotation, the problem of over-quadrant error existing in the cross interpolation of a processing center and the problem of the complex processing procedure of repeated operation of inner and outer surfaces in multiple times in the traditional processing are solved, the production precision and the production efficiency are greatly improved.

Claims (8)

1. A novel special machine tool for a scroll disk is characterized by comprising a cutter motion module (1), a cooling and lubricating system (2), a double-shaft cutter module (3), a workbench and a clamp module (4); the workbench and clamp module (4), the cutter motion module (1) and the double-shaft cutter module (3) form a coating type integral connection, and the cooling and lubricating system (2) is arranged in the whole machine tool; the cooling and lubricating system (2) is positioned in the machine tool and provides circulation of cutting fluid and lubricating fluid for the whole machine tool;

the cutter moving module (1) comprises an x-axis linear motor module (11), a z-axis linear motor module (12), a side wall connecting block (13) and a main shaft connecting block (14);

the double-shaft cutter module (3) comprises a cutter holder (31), a double-shaft motor (32), a double milling cutter (33) and a central spindle (34);

the workbench and clamp module (4) comprises an edge locking clamp (42), an edge clamp (43), a side clamp (44) and a workbench (45), wherein the edge locking clamp (42) comprises a plurality of locking fasteners (421) for locking the edge clamp (43) and the side clamp (44); the edge clamp (43) comprises a clamping claw (431), an elastic pad (432), a clamping nut (433) and a clamping screw (434); the lateral clamp (44) comprises a self-centering chuck (441), clamping jaws (442);

the two side wall connecting blocks (13) are positioned at the left side and the right side of the lower part of the cutter moving module (1), x-axis linear motor modules (11) are arranged on the two side wall connecting blocks (13), the left end and the right end of the main shaft connecting block (14) are respectively arranged on one x-axis linear motor module (11), the main shaft connecting block (14) is movably connected with the two side wall connecting blocks (13), and two z-axis linear motor modules (12) are arranged on the main shaft connecting block (14); the cutter spindle module (3) is movably connected with a spindle connecting block (14) through a z-axis linear motor module (12);

the double-shaft motor (32) is embedded in the cutter holder (31), and the double-shaft motor (32) extends out of two shafts in the same direction and is respectively connected with two milling cutters (33); the tool apron (31) is arranged on the guide rail sliding blocks of the two Z-axis linear motor modules (12) to realize movable connection of the Z axis;

a motor is embedded in the workbench (45) and fixedly connected with the machine tool body, an edge locking clamp (42), an edge clamp (43) and a side clamp (44) are fixedly connected to the workbench (45), and a workpiece (41) is clamped on the clamps; in the side surface clamp (44), a self-centering chuck (441) is buckled with the side surface of the lower part of a workpiece through clamping claws (442), in an edge clamp (43), two ends of a clamping nut (433) are respectively connected with a left clamping claw (431) and a right clamping claw (431), an elastic pad (432) is embedded in the clamping side of the clamping claws (431), a clamping screw (434) is a locking rod with a rotatable screw thread, the two ends of the clamping screw (434) and the clamping nut (433) are matched through the screw thread, when the clamping screw (434) rotates, the two ends of the clamping nut (433) respectively drive the left clamping claw (431) and the right clamping claw (431) to perform locking or loosening actions, a locking fastener (421) is provided with a screw rod seat and a vertical screw rod in threaded fit with the screw rod seat, and the screw rod can move up and down relative to the screw rod seat by rotating the screw rod; when locking is needed, a plurality of locking fasteners are buckled on the outer sides of the edge clamp (43) and the side clamp (44) firstly, the edge clamp (43) and the side clamp (44) are positioned in the middle of the screw rod seat, the vertical screw rod is rotated to move downwards, and the lower end surface of the screw rod and the upper surface and the lower surface of the screw rod seat clamp the edge clamp (43) and the side clamp (44).

2. A novel machine tool special for scroll pan according to claim 1 characterized in that said side wall connecting block (13) and spindle connecting block (14) enclose the working table and clamp module (4) and the tool spindle module (3) to connect the working space of the tool spindle module (3) and the workpiece as a whole, the tool spindle module (3) has no axial deviation with the connecting support to form a zero overhang structure, and the spindle connecting block (14) is arranged with rib plate structure.

3. A novel machine tool special for a scroll disk as claimed in claim 1, wherein said two milling cutters make a linear feed motion from the start end of the scroll disk to the center of the circle, the workpiece makes a fixed axis rotation motion, and the spiral track processing path of the scroll disk is realized by the superposition of two simple motions and the reasonable speed adjustment of the two motions.

4. A novel machine tool special for scroll pan according to claim 1 characterized in that the center distance of said two milling cutters (33) can be adjusted according to the wall thickness of the processing part, the cutting edges of the two milling cutters are opposite in the forward and reverse directions, the processing length of the milling cutter is longer than the length to be processed of the side surface of scroll pan.

5. A novel machine tool special for scroll pan according to claim 1 characterized in that the axis of the central main shaft (34) and the guide rail sliding blocks of the two z-axis linear motor modules (12) are on the same vertical plane, and the feeding force is directly transmitted to the tool holder (31) through the sliding blocks.

6. A novel machine tool special for scroll pan according to claim 1 characterized in that said clamping claw (431) is shaped to fit the spiral round side of the outer side of the workpiece, the clamping claw (431) is closely fitted with the outer side of the workpiece scroll pan through the end elastic pad (432).

7. A novel scroll-specific machine tool as claimed in claim 1, wherein the self-centering chuck (441) is a three-jaw self-centering chuck, and three clamping jaws (442) are provided at 120 ° intervals.

8. A method for processing a novel special scroll machine tool as claimed in claim 1, characterized by comprising the following steps:

1) the side surface of a disc at the lower end of a workpiece is clamped in a self-centering manner by adjusting clamping claws (442) of a self-centering chuck (441), then a screw (434) is rotated, and clamping claws (431) at two sides are driven to surround and clamp the outer side surface of a scroll of the workpiece through a nut seat (433);

2) the clamping claw (431) is tightly attached to the outer side face of the workpiece scroll through a tail end elastic pad (432), the elastic pad (432) can relieve the impact effect caused by thermal deformation in the workpiece thin-wall machining process, and after clamping is finished, the edge clamp (43) and the side clamp (44) are locked through a locking fastener (421) on the circumference;

3) after the workpiece is clamped, the motor drives the workbench (45) and the workpiece (41) to rotate, meanwhile, the x-axis linear motor module (11) is started to realize the feed motion of the tool apron in the x-axis direction, and the z-axis linear motor module (12) is started to realize the feed and retreat motion of the tool apron in the z-axis direction;

4) the two milling cutters form a double milling cutter structure, the double milling cutters perform linear feed motion from the starting end of the scroll disk to the circle center, the outer cutters of the double milling cutters process the outer side surface of the scroll disk, the inner cutters process the inner side surface, and most of processing stress of the two cutters can be mutually offset; because the length of the milling cutter is greater than the length to be processed of the scroll disc, the inner surface and the outer surface of the scroll disc can be processed at one time under the conditions that the cutter is fed linearly without reversing and the working table rotates in a non-reversing way;

5) the cooling and lubricating system (2) adds cutting fluid to the workpiece in the machining process and cools and lubricates various parts of the machine tool.

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