CN109605052A - High-precision devitrified glass motor stator vehicle grinds complex machining process and special tooling - Google Patents
High-precision devitrified glass motor stator vehicle grinds complex machining process and special tooling Download PDFInfo
- Publication number
- CN109605052A CN109605052A CN201811472237.4A CN201811472237A CN109605052A CN 109605052 A CN109605052 A CN 109605052A CN 201811472237 A CN201811472237 A CN 201811472237A CN 109605052 A CN109605052 A CN 109605052A
- Authority
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- China
- Prior art keywords
- fixing seat
- stator
- positioning tool
- centering plate
- positioning
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/12—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for securing to a spindle in general
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
Abstract
The present invention relates to a kind of high-precision devitrified glass motor stator vehicle mill complex machining process and special tooling, which includes fixing seat, connection ring, radial centering plate, part positioning tool and gland.Mentality of designing of the present invention is ingenious, the measures such as Combined Machining Technology and design specialized tooling are ground by introducing vehicle to solve the processing problem of high-precision devitrified glass inner hole of motor stator, improve work efficiency, ensure that product quality, reduce the dependence to equipment, with promotional value.
Description
Technical field
The present invention relates to gyroscope motor stator High Efficiency NC Machining Technology field, especially a kind of high-precision devitrified glass
Motor stator vehicle grinds complex machining process and special tooling.
Background technique
High-precision liquid floated gyroscope dynamic pressure motor core component stator material therefor is hard brittle material processable ceramic, the portion
Part is composed of various parts, and structure is complicated, integrally belongs to annular thin wall structure, and is only 0.2mm at radial thickness minimum,
It is very easy to problem of Cracking occur to lead to component exhaustion, Fig. 1 show motor stator schematic perspective view, and the stator is by stator
Outer cover 1, stator frame 2 and the coil 3 being wound on stator frame form, and wherein stator frame and stator outer housing material are crystallite glass
Glass.
Since stator outer housing and stator frame material therefor are devitrified glass, and minimum wall thickness (MINI W.) is 0.2mm, therefore it is each
The final finishing at position is all made of grinding.But due to structure limitation reason, stator frame both ends inner wall can only be using straight
Diameter is that the grinding wheel of 2mm is processed, and processing efficiency is not high, and higher to grinding machine required precision.In addition to this, due to stator frame
Both ends inner wall is blind hole, and interior mill can not be worked into final axial end face when processing, and finally need to also be guaranteed by finishing processing final
Axial depth increases secondary alignment time, further reduced processing efficiency.
By literature search, the country be there is no with vehicle mill combined machining method processing microcrystal glass material gyroscope motor stator
Processing technology and tooling.
Summary of the invention
In place of making up the deficiencies in the prior art, devitrified glass can be greatly improved by providing one kind
Motor stator processing efficiency reduces difficulty of processing, reduces the dependence to equipment for grinding, further increases scheduling of production flexibility
High-precision devitrified glass motor stator vehicle mill complex machining process and special tooling.
The purpose of the present invention is what is realized by following technological means:
A kind of high-precision devitrified glass motor stator vehicle mill complex machining process, it is characterised in that: the following steps are included:
(1), it is loaded fixing seat left end installing handle using spring chuck, centering or light put down its and installs positioning surface, will using screw
Connection ring and radial centering plate are mounted in fixing seat, guarantee radial centering plate corresponding end-faces and fixing seat installation positioning face paste
It is real, and eight bulbs are adjusted into screw and are fitted into connection ring, part positioning tool is mounted on radial centering plate later, guarantees it
Mounting surface and radial centering plate positioning surface are sturdy；
(2), stator is fitted into part positioning tool, guarantees that stator faces and part positioning tool positioning surface are sturdy, then
Stator is compressed using gland；
(3) centering stator inner hole is needed first before, processing stator inner wall, slightly unclamps radial centering plate mounting screw first, so
Eight centering bulbs are adjusted afterwards and adjust screw guarantee stator inner hole circular runout no more than 0.002mm, then tighten radial centering
Plate mounting screw；It is loaded on the outside of skive processing stator inner wall using power head axial in milling-lathe machining center later
Portion size reaches drawing requirement, then reaches drawing requirement using lathe tool processing stator inner wall inboard portion size, finally uses turnning and milling
Axial power head is loaded skive light stator inner wall once in machining center；
(4), finally u-turn repeats (2) (3) processing that step completes the other end inner wall of part with step.
Moreover, step (3) in processing stator inner wall exterior portion size when the diameter of skive that uses be 20mm；
Step (3) in polishing stator inner wall when the diameter of skive that uses be 2mm.
A kind of special tooling of high-precision devitrified glass motor stator vehicle mill complex machining process, it is characterised in that: including
Fixing seat, connection ring, radial centering plate, part positioning tool and gland, the left side of fixing seat are coaxially produced for connecting machine
The outside of the installing handle of bed main shaft, fixing seat is installed by connection ring；It is radial by radial bulb adjusting screw installation inside connection ring
The right side of centering plate, the radial direction centering plate and fixing seat is installed, and the axle center of radial centering plate is co-axially mounted part positioning tool；
Part location hole is coaxially produced in the axle center of the part positioning tool, is co-axially mounted gland on the outside of the part positioning tool, the pressure
Produce the through-hole of one with the coaxial arrangement of part location hole in the axle center of lid.
Moreover, installing handle is coaxially produced in the left side of the fixing seat, the side wall of fixing seat is along the circumferential direction fabric
Multiple radially connected threaded holes out, multiple axial connection screw thread holes are along the circumferential direction uniformly produced in the right side of fixing seat, fixed
The right side of seat is mounting surface, and the flatness of the mounting surface is not more than 0.002mm, and middle section has processed knife face to guarantee
The planarity requirements of mounting surface.
Moreover, the connection ring is an annular body, the left side of the annular body side wall is along the circumferential direction fabric
Multiple radiai adjustment screw threads are along the circumferential direction uniformly produced on multiple radially connected screw thread via holes, the right side of annular body side wall out
Hole, wherein connection ring is connect by radially connected screw by the radially connected screw thread via hole in left end with fixing seat, right end radiai adjustment
Threaded hole adjusts screw for installing radial bulb.
Moreover, the radial centering plate is a circular slab, the left side of the circular slab is installation positioning surface, the installation
Positioning surface and fixing seat corresponding end-faces are sturdy, and flatness is not more than 0.002mm, and centre has processed knife face to guarantee plane
Degree requires；Circular slab along the circumferential direction produces multiple axial bolt mounting holes, and a positioning work is coaxially produced in the axle center of circular slab
Installation screw is filled, which is positioning tool positioning surface for installing positioning tool, the right side of circular slab,
The positioning tool positioning surface and part positioning tool corresponding end-faces are sturdy, and positioning tool positioning surface is parallel with left end installation positioning surface
Degree is not more than 0.002mm.
Moreover, the part positioning tool includes a cylindrical body, the left side of the main body coaxially produces one
Mounting post produces installation external screw thread on the outside of the mounting post, and the installation external screw thread and radial centering plate respective threaded cooperate；Main body
Left side be positioning tool mounting surface, the positioning tool mounting surface and radial direction centering plate corresponding end-faces are sturdy；The right end of main body
Axle center coaxially produce part location hole, the inner face of the part location hole is part positioning surface, and the part positioning surface is for fixed
Sub- end face positioning, part location hole are used for the radial coarse positioning of stator；Gland installation screw thread, the pressure are produced on the outside of the right end of main body
Lid installation screw thread is for installing gland.
Moreover, the gland is cover shape main body, installation internal screw thread is produced in the left end of the cover shape main body, the installation internal screw thread
External screw thread cooperation corresponding to positioning tool；The inner face of cover shape main body is pressure side surface, which is used for compressing component phase
Answer end face；Produce the through-hole of one with the coaxial arrangement of part location hole in the axle center of cover shape main body.
The advantages and positive effects of the present invention are:
1, vehicle mill combined machining method is applied in the processing of high-precision devitrified glass motor stator by the present invention, Ke Yixian
The processing efficiency for improving part is write, while reducing the dependence to grinding process equipment.
2, the present invention is optimized original using the processing technology for being sequentially completed the grinding of stator frame inner wall and turning that is loaded twice
To complete the grinding of stator frame inner wall and the technique of turnery processing in being once loaded, and devise processing tool.Using optimization
The difficulty of processing of part can be significantly reduced in technique and processing tool afterwards, improves machining accuracy, while can significantly improve zero
The processing efficiency of part reduces manufacturing cost.
3, mentality of designing of the present invention is ingenious, has novelty, grinds Combined Machining Technology and design specialized work by introducing vehicle
The measures such as dress solve the processing problem of high-precision devitrified glass inner hole of motor stator, improve work efficiency, ensure that product
Quality reduces dependence to equipment, has promotional value.
Detailed description of the invention
Fig. 1 is gyroscope motor stator schematic perspective view (section)；
Fig. 2 is fixing seat schematic diagram；
Fig. 3 is connection ring schematic diagram；
Fig. 4 is radial centering plate schematic diagram；Wherein a is left side schematic diagram；B is right side schematic diagram；
Fig. 5 is part positioning tool schematic diagram；Wherein a is left side schematic diagram；B is right side schematic diagram；
Fig. 6 is gland schematic diagram；
Fig. 7 is dedicated unit assembling schematic diagram；
Fig. 8 is stator scheme of installation；
Fig. 9 is stator processing schematic diagram one；
Figure 10 is stator processing schematic diagram two.
Specific embodiment
With reference to the accompanying drawing in detail narration the embodiment of the present invention, it should be noted that the present embodiment be it is narrative, no
It is restrictive, this does not limit the scope of protection of the present invention.
Process flow to facilitate the understanding of the present invention, first below to the structure of special tooling used in this technique into
Row is discussed in detail:
A kind of high-precision devitrified glass motor stator vehicle mill Compound Machining special tooling, including fixing seat 4, connection ring 9, diameter
To centering plate 12, part positioning tool 17 and gland 24, the peace for connecting machine tool main shaft is coaxially produced in the left side of fixing seat
The outside of hilt, fixing seat is installed by connection ring；Inside adjusts screw, the right side of the radial direction centering plate and fixing seat by radial bulb
End face installation, the axle center of radial centering plate is co-axially mounted part positioning tool；Coaxially produce zero in the axle center of the part positioning tool
Part location hole is co-axially mounted gland on the outside of the part positioning tool, the axle center of the gland produce one it is same with part location hole
The through-hole of axis setting.It is described below in conjunction with specific structure of the attached drawing to each component:
(1), fixing seat
Fig. 2 show fixing seat schematic diagram, and fixing seat is the part for connecting machine tool and centering component.A left side for fixing seat
Installing handle 7 is coaxially produced in end face, which is used for connecting machine tool main shaft；The side wall of fixing seat is along the circumferential direction fabric
Multiple radially connected threaded holes 8 out, the radially connected threaded hole is for being fixedly connected with ring；The right side of fixing seat is along the circumferential direction
Multiple axial connection screw thread holes 5 are uniformly produced, the axial direction connection screw thread hole is for connecting radial centering plate.The right side of fixing seat
For mounting surface 6, for the precision for guaranteeing radial centering, the flatness of the mounting surface is not more than 0.002mm, and middle section processing one
Empty knife face is to guarantee the planarity requirements of mounting surface.
(2), connection ring
Fig. 3 show connection ring schematic diagram, and connection ring is the part for being connected and fixed seat and radial centering plate.Connection ring
For an annular body, multiple radially connected screw thread via holes 10 are along the circumferential direction uniformly produced in the left side of the annular body side wall,
Multiple radiai adjustment threaded holes 11 are along the circumferential direction uniformly produced on the right side of annular body side wall, wherein radially connected screw passes through
Connection ring is connect by the radially connected screw thread via hole in left end with fixing seat, and right end radiai adjustment threaded hole is for installing radial bulb tune
Save screw.
(3), radial centering plate
Fig. 4 show radial centering plate schematic diagram, and radial centering plate primarily serves radial centering and retaining element positioning work
The effect of dress.Radial centering plate is a circular slab, and the left side of the circular slab is installation positioning surface 13, the installation positioning surface with
Fixing seat corresponding end-faces (mounting surface of fixing seat right end) are sturdy, and flatness is not more than 0.002mm, and centre has processed knife
Face is to guarantee planarity requirements.Circular slab along the circumferential direction produces multiple axial bolt mounting holes 14, the axial bolt mounting hole
For connecting radial centering plate and fixing seat.Coaxially produce a positioning tool installation screw 16, the positioning in the axle center of circular slab
Tooling installation screw is for installing positioning tool.The right side of circular slab is positioning tool positioning surface 15, positioning tool positioning
Face and part positioning tool corresponding end-faces are sturdy, and positioning tool positioning surface is not more than with the left end installation positioning surface depth of parallelism
0.002mm。
(4), part positioning tool
Fig. 5 show part positioning tool schematic diagram, and part positioning tool primarily serves the radial centering plate of connection and part
The effect of positioning.Part positioning tool includes a cylindrical body, and a mounting post 19 is coaxially produced in the left side of the main body,
Installation external screw thread 18 is produced on the outside of the mounting post, (positioning tool is installed for the installation external screw thread and radial centering plate respective threaded
The screw thread of screw hole) cooperation.The left side of main body is positioning tool mounting surface 20, the positioning tool mounting surface and radial centering plate phase
Answer end face (positioning tool positioning surface) sturdy.Part location hole 23 is coaxially produced in the axle center of the right end of main body, the part location hole
Inner face be part positioning surface 22, the part positioning surface for stator faces position, part location hole for stator radial direction
Coarse positioning.Gland installation screw thread 21 is produced on the outside of the right end of main body, gland installation screw thread guarantees to compress zero for installing gland
Part.
(5), gland
Fig. 6 show gland schematic diagram, and gland is connected with part positioning tool, primarily serves the effect of compressing component.
Gland is cover shape main body, and installation internal screw thread 26 is produced in the left end of the cover shape main body, and the installation internal screw thread is corresponding to positioning tool outer
Screw thread (gland installation screw thread) cooperation.The inner face of cover shape main body is pressure side surface 27, which is used for compressing component phase
Answer end face.Produce the through-hole 25 of one with the coaxial arrangement of part location hole in the axle center of cover shape main body.
A kind of high-precision devitrified glass motor stator vehicle mill complex machining process, comprising the following steps:
(1), it is loaded fixing seat left end installing handle using spring chuck, centering or light put down its and installs positioning surface, will using screw
Connection ring and radial centering plate are mounted in fixing seat, guarantee radial centering plate corresponding end-faces and fixing seat installation positioning face paste
It is real, and eight bulbs are adjusted into screw and are fitted into connection ring, part positioning tool is mounted on radial centering plate later, guarantees it
Mounting surface and radial centering plate positioning surface are sturdy, as shown in Figure 7.
(2), stator 28 is fitted into part positioning tool, guarantees that stator faces and part positioning tool positioning surface are sturdy, so
Stator is compressed using gland afterwards, as shown in Figure 8.
(3) centering stator inner hole is needed first before, processing stator inner wall, slightly unclamps radial centering plate mounting screw first, so
Eight centering bulbs are adjusted afterwards and adjust screw guarantee stator inner hole circular runout no more than 0.002mm, then tighten radial centering
Plate mounting screw；Axial power head in milling-lathe machining center is used to be loaded diameter as the processing of the skive of 20mm later
Stator inner wall exterior portion size reaches drawing requirement, then reaches drawing requirement using lathe tool processing stator inner wall inboard portion size,
Axial power head is finally used in milling-lathe machining center to be loaded diameter as the skive light of 2mm once stator inner wall,
As shown in FIG. 9 and 10.
(4), finally u-turn repeats (2) (3) processing that step completes the other end inner wall of part with step.Due to Vehicle Processing portion
Be not in problem of Cracking when dividing stator inner wall wall thickness thicker, therefore processing, and thin-walled is carried out using the grinding wheel of diameter 20mm
Grinding wheel is rigidly preferable when place's processing, and processing efficiency also had a distinct increment than in the past.Due to turning and grinding once be loaded in into
Row, it is almost the same to connect size at knife, only need to finally using small grinding wheel tarry matter once.The program not only reduces simple add
Between working hour, the secondary alignment time between vehicle mill is also reduced, therefore processing efficiency has larger promotion than before.
Claims (8)
1. a kind of high-precision devitrified glass motor stator vehicle grinds complex machining process, it is characterised in that: the following steps are included:
(1), it is loaded fixing seat left end installing handle using spring chuck, centering or light put down its and installs positioning surface, will be connected using screw
Ring and radial centering plate are mounted in fixing seat, guarantee that radial centering plate corresponding end-faces and fixing seat installation positioning surface are sturdy, and
Eight bulbs are adjusted screw to be fitted into connection ring, part positioning tool is mounted on radial centering plate later, guarantees its installation
Face and radial centering plate positioning surface are sturdy；
(2), stator is fitted into part positioning tool, guarantees that stator faces and part positioning tool positioning surface are sturdy, then uses
Gland compresses stator；
(3) centering stator inner hole is needed first before, processing stator inner wall, is slightly unclamped radial centering plate mounting screw first, is then adjusted
It saves eight centering bulbs and adjusts screw guarantee stator inner hole circular runout no more than 0.002mm, then tighten radial centering plate peace
Cartridge screw；It is loaded skive processing stator inner wall exterior portion using power head axial in milling-lathe machining center later
Size reaches drawing requirement, then reaches drawing requirement using lathe tool processing stator inner wall inboard portion size, finally uses turn-milling cutting
Axial power head is loaded skive light stator inner wall once in center；
(4), finally u-turn repeats (2) (3) processing that step completes the other end inner wall of part with step.
2. a kind of high-precision devitrified glass motor stator vehicle according to claim 1 grinds complex machining process, feature exists
In: the diameter of the skive used when step (3) middle processing stator inner wall exterior portion size is 20mm；Step is (3) middle to throw
The diameter of the skive used when light stator inner wall is 2mm.
3. a kind of special tooling of high-precision devitrified glass motor stator vehicle mill complex machining process as described in claim 1,
It is characterized by comprising fixing seat, connection ring, radial centering plate, part positioning tool and gland, the left side of fixing seat are coaxial
The installing handle for connecting machine tool main shaft is produced, connection ring is installed in the outside of fixing seat；Pass through radial bulb tune inside connection ring
It saves screw and radial centering plate is installed, the right side installation of the radial direction centering plate and fixing seat, the axle center of radial centering plate is coaxially pacified
Fill part positioning tool；Part location hole is coaxially produced in the axle center of the part positioning tool, and the outside of the part positioning tool is same
Axis installs gland, and the through-hole of one with the coaxial arrangement of part location hole are produced in the axle center of the gland.
4. a kind of high-precision devitrified glass motor stator vehicle according to claim 3 grinds Compound Machining special tooling, special
Sign is: installing handle is coaxially produced in the left side of the fixing seat, and the side wall of fixing seat is along the circumferential direction uniformly produced multiple
Multiple axial connection screw thread holes, the right side of fixing seat are along the circumferential direction uniformly produced in radially connected threaded hole, the right side of fixing seat
End face is mounting surface, and the flatness of the mounting surface is not more than 0.002mm, and middle section has processed knife face to guarantee mounting surface
Planarity requirements.
5. a kind of high-precision devitrified glass motor stator vehicle according to claim 3 grinds Compound Machining special tooling, special
Sign is: the connection ring is an annular body, and the left side of the annular body side wall is along the circumferential direction uniformly produced multiple
Multiple radiai adjustment threaded holes are along the circumferential direction uniformly produced on radially connected screw thread via hole, the right side of annular body side wall, wherein
Connection ring is connect by radially connected screw by the radially connected screw thread via hole in left end with fixing seat, and right end radiai adjustment threaded hole is used
Screw is adjusted in installing radial bulb.
6. a kind of high-precision devitrified glass motor stator vehicle according to claim 3 grinds Compound Machining special tooling, special
Sign is: the radial centering plate is a circular slab, and the left side of the circular slab is installation positioning surface, the installation positioning surface
Sturdy with fixing seat corresponding end-faces, flatness is not more than 0.002mm, and centre has processed knife face to guarantee that flatness is wanted
It asks；Circular slab along the circumferential direction produces multiple axial bolt mounting holes, and a positioning tool peace is coaxially produced in the axle center of circular slab
Screw hole is filled, which is positioning tool positioning surface for installing positioning tool, the right side of circular slab, this is fixed
Position tool positioning surface and part positioning tool corresponding end-faces are sturdy, and positioning tool positioning surface and the left end installation positioning surface depth of parallelism are not
Greater than 0.002mm.
7. a kind of high-precision devitrified glass motor stator vehicle according to claim 3 grinds Compound Machining special tooling, special
Sign is: the part positioning tool includes a cylindrical body, and a mounting post is coaxially produced in the left side of the main body,
Installation external screw thread is produced on the outside of the mounting post, the installation external screw thread and radial centering plate respective threaded cooperate；The left end of main body
Face is positioning tool mounting surface, and the positioning tool mounting surface and radial centering plate corresponding end-faces are sturdy；The axle center of the right end of main body
Part location hole coaxially is produced, the inner face of the part location hole is part positioning surface, which is used for stator faces
Positioning, part location hole are used for the radial coarse positioning of stator；Gland installation screw thread, gland installation are produced on the outside of the right end of main body
Screw thread is for installing gland.
8. a kind of high-precision devitrified glass motor stator vehicle according to claim 3 grinds Compound Machining special tooling, special
Sign is: the gland is cover shape main body, and installation internal screw thread is produced in the left end of the cover shape main body, the installation internal screw thread and positioning
The corresponding external screw thread cooperation of tooling；The inner face of cover shape main body is pressure side surface, which is used for compressing component corresponding end-faces；
Produce the through-hole of one with the coaxial arrangement of part location hole in the axle center of cover shape main body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811472237.4A CN109605052B (en) | 2018-12-04 | 2018-12-04 | High-precision microcrystalline glass motor stator turning and grinding combined machining process and special tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811472237.4A CN109605052B (en) | 2018-12-04 | 2018-12-04 | High-precision microcrystalline glass motor stator turning and grinding combined machining process and special tool |
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| Publication Number | Publication Date |
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| CN109605052A true CN109605052A (en) | 2019-04-12 |
| CN109605052B CN109605052B (en) | 2020-09-01 |
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ID=66007075
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811472237.4A Active CN109605052B (en) | 2018-12-04 | 2018-12-04 | High-precision microcrystalline glass motor stator turning and grinding combined machining process and special tool |
Country Status (1)
| Country | Link |
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| CN (1) | CN109605052B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111037324A (en) * | 2020-01-03 | 2020-04-21 | 中国船舶重工集团公司第七0七研究所 | Device and method for precisely milling and deburring metal harmonic oscillator |
| CN111168477A (en) * | 2020-01-03 | 2020-05-19 | 中国船舶重工集团公司第七0七研究所 | Precision grinding tool and process for quartz glass ball parts |
| CN112338703A (en) * | 2020-09-30 | 2021-02-09 | 天津津航技术物理研究所 | Method and tool for polishing inner wall and outer wall of circular-ring-cylinder-shaped optical part |
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| Publication number | Publication date |
|---|---|
| CN109605052B (en) | 2020-09-01 |
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