CN115055713A - High-precision machining method for motor base - Google Patents

Abstract

The invention discloses a high-precision machining method of a motor base, which comprises a rough machining tool and a fine machining tool, wherein the horizontal axes of the rough machining tool and the fine machining tool are arranged on a rack in the same way; the mode of changing rotary cutting of a workpiece into fixed cutting is separated through a rough and fine machining process. The original turning process is changed into a boring process processing mode, only the single-cutter feeding of a boring cutter is not needed, but the mode of processing the semi-fine boring and the fine boring of the double-support cutter bar and the forming cutter plate is changed, and the original processing process route is improved by completing the processing of one step by one-time feeding.

Description

High-precision machining method for motor base

The scheme is a divisional application of a parent application, wherein the patent application is under the application number of 202010914519.6, the application date of 2020-09-03 and the name of 'a use method of a motor base tool'.

Technical Field

The invention relates to the field of motor processing, in particular to a high-precision processing method of a motor base.

Background

The original process of the motor base comprises the following steps: roughly and finely milling the motor handle joint surface, the square outline, the collision stopping block handle joint surface and the joint surface of the motor base and the lower workpiece on a milling machine, and roughly and finely turning all the apertures of the workpiece on a lathe by using a special tool.

Since the lathe is for rotary cutting of a workpiece, the closer the center of mass of the rotary body to the center of the spindle, the better the machining accuracy. However, the motor base is a casting, and the mass center of the workpiece cannot be accurately determined, so that the machined workpiece has the defect that the cylindricity of each hole is out of tolerance; due to lathe fixture factors, the problems of out-of-plumb between the motor handle joint surface and the positioning spigot and the like can be caused.

In order to improve the machining precision of a machine tool motor base, the rotary cutting mode of a workpiece is changed into a fixed cutting mode; the motor takes the joint surface as a guide reference surface for positioning spigot processing, so that the processing precision and efficiency are improved, and the burden of workers is reduced.

A novel motor base tool for machining a motor and a matched machining process are needed at present, the machining precision of a machine tool motor base can be improved, and the out-of-perpendicularity of a motor handle closed surface and a positioning spigot is avoided.

Disclosure of Invention

The invention aims to solve the problem that in the prior art, the cylindricity of each hole of a workpiece processed by a motor base is out of tolerance; the problem that the perpendicularity of a closed surface and a positioning spigot of a motor is out of tolerance can be caused, the motor base tool is provided, and the problem is solved by a mode that a rough machining process is separated, and workpiece rotary cutting is changed into fixed cutting.

The invention provides a motor base tool, which comprises a rough machining tool and a fine machining tool, wherein the horizontal axes of the rough machining tool and the fine machining tool are arranged on a rack in the same way, the fine machining tool comprises a boring hole part and a tool part, the boring hole part and the tool part are respectively arranged at the upper end of the rack, the tool part is arranged at the inner side of the boring hole part, the boring hole part comprises a boring cutter and a bracket, the boring cutter comprises a special connecting handle, the special connecting handle is arranged at one end of the cutter rod, the boring cutter plate is arranged in the middle of the cutter rod, the upper half part of the special cutter handle is a cylinder with the lower circular truncated cone part and the diameter equal to that of the circular truncated cone, the cylinder and the circular truncated cone are coaxial, a pin hole vertical to the axis of the cylinder is formed in the side surface of the cylinder, a counter bore used for being connected with the cutter rod is formed in the bottom of the cylinder, the through hole penetrates through the side surface of the counter bore, and a connecting device used for being connected with a power device is arranged on the side surface of the cylinder; the support comprises a first support frame and a second support frame, the first support frame and the second support frame are arranged at the upper end of the rack and are arranged oppositely, the first support frame is arranged between the special connecting handle and the boring cutter plate, the second support frame is arranged at the opposite end of the cutter bar provided with the special connecting handle, and the first support frame and the second support frame are respectively movably connected with the cutter bar; the rough machining tool comprises a tool base, a first clamp group and an end clamp, the tool base is arranged on the upper end of the frame, the end clamp is perpendicularly arranged at one end of the tool base, the first clamp group is arranged on two sides of the tool base, the tool base comprises a first base, a second base and a third base, the two sides of the first base are respectively provided with the second base and the third base, the heights of the second base and the third base are equal and larger than the height of the first base, the upper end of the second base and the upper end of the third base are provided with the supporting blocks, the supporting blocks are L-shaped and are opposite in opening, and the upper surface edge of the horizontal part of each L-shaped supporting block is provided with a chamfer.

And two tools of rough machining and fine machining are arranged and used for separating a rough machining procedure and a fine machining procedure and changing rotary cutting of a workpiece into a fixed cutting mode. The original turning process is changed into a boring process processing mode, meanwhile, the single-cutter feeding of a boring cutter is not needed, the mode of processing semi-fine boring and fine boring of a double-support cutter bar and a forming cutter plate is changed, and the original processing process route is improved by completing the processing of one step by one-time cutter feeding.

The boring machine spindle has the advantage that a cutter stably cuts after the cutter is fed, the clamp adopts a double-support cutter bar structure, the center position of a support frame is fixed, and the cutter bar is required to be cut in a floating mode. Therefore, a special connecting handle is specially developed and designed for the clamp, the cylindrical pin is used for shifting the cutter bar to rotate, and the support pin is used for transmitting axial force to realize cutting of each cutter.

The invention relates to a motor base tool, which is an optimal mode, an end clamp comprises a fixed block and an end clamp body, the lower end of the fixed block is perpendicular to a first base and is arranged at the upper end of a rack, the end clamp body is hinged to the fixed block, a hinged shaft is parallel to the end face of the tool base and is connected with the end clamp, the end clamp body is of a Y-shaped structure, one end of the Y-shaped structure of the end clamp body is hinged to the fixed block, two symmetrically arranged ends of the Y-shaped structure of the end clamp body are arranged above the tool base, a through hole is formed in the middle of the fixed block, positioning supports perpendicular to the end clamp body are arranged at the end parts of the two symmetrically arranged ends of the Y-shaped structure of the end clamp body, and limiting bolts perpendicular to the hinged shaft are arranged on the positioning supports.

The positioning support is matched and limited with the position of a bearing gland at the upper end of the motor, and a limiting bolt is fixed on a bearing gland closing surface.

As a preferable mode, the first clamp group comprises at least one pair of first clamps which are arranged oppositely, each first clamp comprises a first guide pillar, a first spring, a first pressing plate and a first limiter, the first guide pillars are arranged perpendicular to the tool base, the first springs are nested on the peripheries of the first guide pillars, the first pressing plates are arranged at the upper ends of the first springs, and the first limiters are arranged at the upper ends of the first pressing plates.

As a preferred mode, the tool part comprises a U-shaped base, a second clamp group and motor base bottom clamping plates, the U-shaped base is arranged at the upper end of the frame, the second clamp group is arranged on two sides of the U-shaped base, and the motor base bottom clamping plates are vertically arranged at one end of the U-shaped base.

The invention relates to a motor base tool, which is a preferable mode, wherein a second clamp group comprises at least one pair of second clamps which are oppositely arranged, each second clamp comprises a second guide pillar, a second spring, a second pressing plate and a second limiting stopper, the second guide pillar is arranged perpendicular to a U-shaped base, the second spring is nested on the periphery of the second guide pillar, the second pressing plate is arranged at the upper end of the second spring, the second limiting stopper is arranged at the upper end of the second pressing plate, the pressing plate is a strip-shaped block body, the width of one end of the strip-shaped block body is smaller than or equal to that of the other end of the strip-shaped block body, the pressing plate is provided with a vertical through hole, the through hole extends from the middle part of the pressing plate to the end with the larger width, and the guide pillar penetrates through the through hole.

The clamp is used for clamping the motor base, the guide pillar is used for providing a guiding effect for the spring, the spring moves along the guide pillar, the upper end of the spring is connected with the pressing plate, when the limiter moves upwards on the guide pillar, the spring is upwards ejected out, and the position of the pressing plate is adjusted.

The motor base tool provided by the invention has the advantages that as a preferable mode, the bottom clamping plate of the motor base comprises a first clamping plate, a second clamping plate and an adjusting device, the adjusting device is used for adjusting the distance between the first clamping plate and the second clamping plate, two ends of the adjusting device are respectively connected with the plate surface of the first clamping plate and the plate surface of the second clamping plate, the first clamping plate and the second clamping plate are arranged in parallel, the same horizontal position of the first clamping plate and the second clamping plate is provided with a through hole which has a high-height axis with a cutter bar and the like and has a diameter larger than or equal to that of the cutter bar.

The invention provides a motor base tool using method, which comprises the following steps:

s1, roughly milling a combined surface of the motor on a milling machine;

s2, milling the four-side outline of the motor handle and the combined surface of the collision stopping block on a milling machine;

s3, roughly and finely milling the joint surface of the lower workpiece on a milling machine by taking care of the positions of the motor positioning spigot and the bearing hole;

s4, performing rough machining, namely, mounting the motor on a rough machining tool, taking the joint surface of the workpiece, namely the upper surface of the U-shaped base, as a positioning reference, taking the side surface of the workpiece as a guide, taking the collision stopping block as a fixed stroke, taking the inner surface of the fixed stroke block as a fixed stroke, and finely milling the joint surface of the motor, the positioning spigot of the rough boring motor and the bearing hole;

and S5, performing a finish machining process, namely, mounting the motor on a finish machining tool, taking the upper surface of the first base as a positioning reference, taking the side surface of the workpiece as a guide, and taking the surface of the first clamping plate facing the second clamping plate as a fixed-distance semi-finish boring and finish boring motor positioning spigot and bearing hole positions by using the motor as a closed surface.

Before clamping of the rough machining tool clamp, the collision stopping block of the workpiece finishes surface combination machining to serve as a fixed-range base point of a sequence, namely a control reference original point on the axial dimension. The procedure is to finish the rough and fine milling of the motor handle combined surface by one-time clamping, and finish the rough machining of other holes and the boring machining of the cutter correcting surface.

The motor processed in the rough machining process leads the combined large end face to be a guide reference face, so that the problem that the combined face is not perpendicular to the positioning spigot can be solved. The double-support cutter bar structure is adopted, so that the vibration during cutting can be reduced, the problem of over-tolerance of cylindricity caused by the cantilever cutting of the boring cutter when the boring depth is too large is solved, and the problem of non-coaxiality of holes can be completely solved; the use of the molding cutting board also greatly improves the processing efficiency and can shorten the processing time by more than 30 percent.

The rough machining process and the rough machining tool have the following advantages: the joint surface of the following workpiece is taken as a positioning reference, so that the positioning reference is superposed with the machining reference, the requirements on form and position tolerance of the machined part are favorably met, and the verticality tolerance of the joint surface of a motor and the positioning reference and the guiding reference of the joint surface can be especially guaranteed; the side surface of the workpiece is used as a guide, the size from the center to the side surface of each hole and the parallelism between the hole and the side surface can be controlled, namely the symmetry of each hole relative to the center of the workpiece is ensured; the total length of the workpiece can be controlled by taking the closing surface of the collision stopping block as a fixed distance; the motor handle finished by the finish milling can be used as a fixed-stroke reference surface of a finish machining process; the casting hard points at each hole of the workpiece can be removed by roughly machining each part, so that the loss of the cutter is saved for the finish machining process; the process of unloading the workpiece to be subjected to the finish machining process is also the process of releasing the stress of the part, so that the stability of the precision of each part of the workpiece can be improved.

The fine processing procedure and the fine processing tool have the following advantages: the procedure also takes the joint surface of the following workpiece as a positioning reference and the side surface of the workpiece as a guide, so that the technological references of the two-procedure processing are superposed, and the processing precision of the workpiece can be better ensured; the motor handle combined surface processed in the above process is a fixed distance, namely a second guide surface (the surface is vertical to the side surface of the workpiece in the process, so that the problem of workpiece over-positioning cannot be mentioned at all), and the verticality tolerance of the combined surface of each hole and the motor handle can be ensured; the verticality tolerance of the bearing gland fitting surface and the bearing hole is allowed; meanwhile, the accuracy of the axial dimension of each hole can be controlled; by adopting the long cutter bar double-support processing technical scheme, the stability of the cutting plate during cutting can be increased, the cylindricity tolerance of each hole and the coaxiality tolerance of each hole are ensured, and the slightly conical condition caused by the deep hole bored by the cantilever can be overcome; compared with the single-cutter boring, the boring machining process scheme for completing one working step by one-time feeding of the formed boring cutter plate can greatly improve the machining efficiency, and the consistency of the tolerance range of each hole is also controlled.

In conclusion, the improved machining process can better control various dimensional tolerances and form and position tolerances of the motor base, improve the machining yield and correspondingly improve the efficiency.

Drawings

FIG. 1 is a schematic view of a motor assembly fixture;

FIG. 2 is a schematic view of a fine machining tool of a motor assembly;

FIG. 3 is a schematic view of a boring part of a motor assembly fixture;

FIG. 4 is a schematic view of a motor assembly tool boring cutter;

FIG. 5 is a schematic view of a motor assembly fixture support;

FIG. 6 is a schematic view of a tooling portion of a motor assembly;

FIG. 7 is a schematic view of a second clamping assembly of a motor assembly fixture;

FIG. 8 is a schematic view of a second fixture of a motor assembly fixture;

FIG. 9 is a schematic view of a clamp plate at the bottom of a motor base of a motor assembly fixture;

FIG. 10 is a schematic view of a rough machining tool of a motor assembly tool;

FIG. 11 is a schematic view of a base of a motor assembly fixture;

FIG. 12 is a schematic view of an end clamp of a motor assembly fixture;

FIG. 13 is a schematic view of a first clamp set of a motor assembly fixture;

FIG. 14 is a schematic view of a first fixture of a motor assembly fixture;

fig. 15 is a flow chart of a method for using a motor assembly tool.

Reference numerals:

1. roughly machining a tool; 11. a tooling base; 111. a first base; 112. a second base; 113. a third base; 12. a first clamp group; 121. a first clamp; 1211. a first guide post; 1212. a first spring; 1213. a first platen; 1214. a first stopper; 13. an end clamp; 131. a stroke setting block; 132. an end clamp body; 2. finely processing the tool; 21. boring a hole part; 211. boring cutter; 2111. a special connecting handle; 2112. a cutter bar; 2113. boring a cutter plate; 212. a support; 2121. a first support frame; 2122. a second support frame; 22. a tooling part; 221. a U-shaped base; 222. a second clamp group; 2221. a second clamp; 22211. a second guide post; 22212. a second spring; 22213. a second platen; 22214. a second stopper; 223. a clamping plate at the bottom of the motor base; 2231. a first splint; 2232. a second splint; 2233. and (4) an adjusting device.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example 1

As shown in FIG. 1, the motor base tool comprises a rough machining tool 1 and a fine machining tool 2, wherein the horizontal axes of the rough machining tool 1 and the fine machining tool 2 are arranged on a rack in the same mode.

As shown in fig. 2, the fine machining tool 2 includes a boring portion 21 and a tool portion 22, the boring portion 21 and the tool portion 22 are respectively provided at an upper end of the frame, and the tool portion 22 is provided inside the boring portion 21.

As shown in fig. 3, the boring portion 21 includes a boring cutter 211 and a bracket 212, and the boring cutter 211 is provided on the bracket 212.

As shown in fig. 4, the boring tool 211 includes a special connection handle 2111, a tool bar 2112 and at least one boring cutting board 2113, the special connection handle 2111 is disposed at one end of the tool bar 2112, the boring cutting board 2113 is disposed in the middle of the tool bar 2112, the upper half of the special tool bar is a cylinder with a circular truncated cone lower edge portion having a diameter equal to that of the circular truncated cone, the cylinder and the circular truncated cone have the same axis, a pin hole perpendicular to the axis of the cylinder is disposed on the side surface of the cylinder, a counter bore for connecting with the tool bar 2112 is disposed at the bottom of the cylinder, the through hole penetrates through the side surface of the counter bore, and a connecting device for connecting a power device is disposed on the side surface of the cylinder.

As shown in fig. 5, the bracket 212 includes a first support 2121 and a second support 2122, the first support 2121 and the second support 2122 are disposed at an upper end of the frame and are opposite to each other, the first support 2121 is disposed between the special stem 2111 and the boring cutting plate 2113, the second support 2122 is disposed at an opposite end of the cutter bar 2112 where the special stem 2111 is disposed, and the first support 2121 and the second support 2122 are movably connected to the cutter bar 2112, respectively.

As shown in fig. 6, the tooling portion 22 includes a U-shaped base 221, a second clamp set 222, and a motor base bottom clamping plate 223, the U-shaped base 221 is disposed at the upper end of the rack, the second clamp set 222 is disposed at two sides of the U-shaped base 221, and the motor base bottom clamping plate 223 is vertically disposed at one end of the U-shaped base 221.

As shown in fig. 7, the second clamp group 222 includes at least one pair of second clamps 2221 disposed opposite to each other, and the second clamps 2221 are disposed at both sides of the U-shaped base 221.

As shown in fig. 8, the second fixture 2221 includes a second guide post 22211, a second spring 22212, a second pressing plate 22213 and a second stopper 22214, the second guide post 22211 is perpendicular to the U-shaped base 221, the second spring 22212 is nested on the periphery of the second guide post 22211, the second pressing plate 22213 is disposed at the upper end of the second spring 22212, the second stopper 22214 is disposed at the upper end of the second pressing plate 22213, the pressing plate is a long strip-shaped block, the width of one end of the long strip-shaped block is less than or equal to the width of the other end, the pressing plate is provided with a vertical through hole, the through hole extends from the middle of the pressing plate to the end with the larger width, and the guide post penetrates through the through hole.

As shown in fig. 9, the motor base bottom clamping plate 223 includes a first clamping plate 2231, a second clamping plate 2232 and an adjusting device 2233, the adjusting device 2233 is used for adjusting the distance between the first clamping plate 2231 and the second clamping plate 2232, two ends of the adjusting device 2233 are respectively connected to the plate surface of the first clamping plate 2231 and the plate surface of the second clamping plate 2232, the first clamping plate 2231 and the second clamping plate 2232 are arranged in parallel, and a through hole having a diameter equal to or larger than the diameter of the knife bar 2112 and having a high axial line with the knife bar 2112 is arranged in the same horizontal position of the first clamping plate 2231 and the second clamping plate 2232.

As shown in fig. 10, the rough machining tool 1 includes a tool base 11, a first clamp group 12 and end clamps 13, the tool base 11 is disposed at the upper end of the machine frame, the end clamps 13 are vertically disposed at one end of the tool base 11, and the first clamp group 12 is disposed at two sides of the tool base 11.

As shown in fig. 11, the tooling base 11 includes a first base 111, a second base 112 and a third base 113, the second base 112 and the third base 113 are respectively disposed on two sides of the first base 111, the second base 112 and the third base 113 have the same height and are greater than the first base 111, the upper ends of the second base 112 and the third base 113 are provided with a backing block, the backing block is L-shaped and has an opposite opening, and the upper surface edge of the horizontal portion of the L-shaped backing block is provided with a chamfer.

As shown in fig. 12, the end clamp 13 includes a stopper 131 and an end clamp body 132, the vertical first base 111 at the lower end of the stopper 131 is arranged at the upper end of the frame, the end clamp body 132 is hinged to the stopper 131 and the end surface of the parallel fixture base 11 with the hinge shaft is connected to the end clamp 13, the end clamp body 132 is of a Y-shaped structure, one end of the Y-shaped structure of the end clamp body 132 is hinged to the stopper 131, two ends of the Y-shaped structure of the end clamp body 132 are symmetrically arranged above the fixture base 11, a through hole is arranged in the middle of the stopper 131, two ends of the Y-shaped structure of the end clamp body 132 are symmetrically arranged to form a positioning bracket of the vertical end clamp body 132, and a limit bolt perpendicular to the hinge shaft is arranged on the positioning bracket.

As shown in fig. 13, the first clamp group 12 includes at least one pair of first clamps 121 disposed opposite to each other, and the first clamps 121 are disposed on two sides of the tooling base 11.

As shown in fig. 14, the first clamp 121 includes a first guide post 1211, a first spring 1212, a first pressing plate 1213 and a first stopper 1214, the first guide post 1211 is disposed perpendicular to the tooling base 11, the first spring 1212 is nested around the first guide post 1211, the first pressing plate 1213 is disposed at an upper end of the first spring 1212, and the first stopper 1214 is disposed at an upper end of the first pressing plate 1213.

As shown in fig. 15, a method for using a motor base tool includes the following steps:

s1, roughly milling a combined surface of the motor on a milling machine;

s2, milling the four-side outline of the motor handle and the combined surface of the collision stopping block on a milling machine;

s3, roughly and finely milling the joint surface of the lower workpiece on a milling machine by taking care of the positions of the motor positioning spigot and the bearing hole;

s4, performing a rough machining process, namely, installing the motor on the rough machining tool 1, taking the joint surface of the workpiece, namely the upper surface of the U-shaped base 221 as a positioning reference, taking the side surface of the workpiece as a guide, taking the collision stopping block as a fixed stroke, namely the inner surface of the fixed stroke block 131 as a fixed stroke, and finely milling the joint surface of the motor, the positioning spigot of the rough boring motor and the bearing hole;

and S5, performing a finish machining process, namely, mounting the motor on a finish machining tool, taking the upper surface of the first base 111 as a positioning reference, taking the side surface of the workpiece as a guide, and taking the surface of the motor, namely, the surface of the first clamping plate 2231 facing the second clamping plate 2232 as each position of a fixed-stroke semi-finish boring and a finish boring motor positioning spigot and a bearing hole.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (3)

1. A high-precision machining method for a motor base comprises the following steps: roughly and finely milling a motor base handle joint surface, a square outline, a collision stopping block handle joint surface and a joint surface of the motor base and a lower workpiece on a milling machine to finish the preprocessing of the motor base;

the motor base tool is characterized by comprising a motor base tool, wherein the motor base tool comprises:

a rough machining tool (1) and a fine machining tool (2);

the horizontal axes of the rough machining tool (1) and the fine machining tool (2) are arranged on the rack in the same way;

the rough machining tool (1) comprises a tool base (11), a first clamp group (12) and end clamps (13), wherein the end clamps (13) are vertically arranged at one end of the tool base (11), the first clamp group (12) is arranged at two sides of the tool base (11), and the tool base (11) comprises a first base (111); the end clamp (13) comprises a stopper (131) and an end clamp body (132), the lower end of the stopper (131) is perpendicular to the first base (111) and is arranged at the upper end of the rack, the end clamp body (132) is hinged with the stopper (131), and the end clamp body (132) is of a Y-shaped structure;

the fine machining tool (2) comprises a boring hole part (21) and a tool part (22), the tool part (22) is arranged on the inner side of the boring hole part (21), the boring hole part comprises a boring cutter (221) and a support (212), the boring cutter (211) is arranged on the support (212), the boring cutter (211) comprises a special cutter handle (2111) and a cutter rod (2112), the special cutter handle (2111) is connected to one end of the cutter rod (2112), the support comprises a first support frame (2121) and a second support frame (2122), the first support frame (2121) and the second support frame (2122) are arranged oppositely, and the first support frame (2121) and the second support frame (2122) are movably connected with the cutter rod (2112) respectively;

the tool part (22) comprises a U-shaped base (221), a second clamp group (222) and a motor base clamping plate (223), the second clamp group (222) is arranged on two sides of the U-shaped base (221), and the motor base bottom clamping plate (223) is perpendicular to one end of the U-shaped base (221);

the motor base clamping plate (223) comprises a first clamping plate (2231) and a second clamping plate (2232), the first clamping plate (2231) and the second clamping plate (2232) are arranged in parallel, and through holes which have the same horizontal positions as the first clamping plate (2231) and the second clamping plate (2232), have the same height with the cutter bar (2112) and have the same axis and the diameter larger than or equal to that of the cutter bar (2112);

the high-precision machining method of the motor base further comprises the following steps:

mounting the preprocessed motor base on a rough machining tool (1), taking the joint surface of a workpiece, namely the upper surface of a U-shaped base (221), as a positioning reference, taking the side surface of the workpiece as a guide, taking a collision stopping block as a fixed stroke, namely the inner surface of a fixed stroke block (131), and finish-milling the joint surface of a motor, roughly boring a motor positioning spigot and a bearing hole to finish rough machining of the motor base;

and (3) installing the motor base which finishes rough machining on the fine machining tool (2), taking the upper surface of the first base (111) as a positioning reference, taking the side surface of the workpiece as a guide, and taking the motor as a combining surface, namely one surface of the first clamping plate (2231) facing the second clamping plate (2232), as each part of a fixed-stroke semi-fine boring and fine boring motor positioning spigot and a bearing hole to finish the fine machining of the motor base.

2. The high-precision machining method for the motor base is characterized in that the first clamp group (12) comprises at least one pair of first clamps (121) which are arranged oppositely, each first clamp (121) comprises a first guide post (1211), a first spring (1212), a first pressing plate and a first stopper (1214), each first guide post (1211) is arranged perpendicular to the tooling base (11), each first spring (1212) is nested on the periphery of each first guide post (1211), each first pressing plate (1213) is arranged at the upper end of each first spring (1212), and each first stopper (1214) is arranged at the upper end of each first pressing plate (1213).

3. The high-precision machining method for the motor base is characterized in that the second clamp group (222) comprises at least one pair of second clamps (2221) which are arranged oppositely, the second clamps (2221) comprise second guide columns (22211), second springs (22212), a second pressure plate (22213) and a second stopper (22214), the second guide columns (22211) are arranged vertically to the U-shaped base (221), the second springs (22212) are nested on the periphery of the second guide columns (22211), the second pressure plate (22213) is arranged at the upper ends of the second springs (22212), the second stopper (22214) is arranged at the upper ends of the second pressure plate (22213), the pressure plate is an elongated block, the width of one end of the elongated block is smaller than or equal to that of the other end of the elongated block, the pressure plate is provided with a vertical through hole, and the vertical through hole extends from the middle of the pressure plate to the end with the larger width, the second guide pillar (22211) penetrates through the vertical through hole.

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