CN109382532A - A kind of thin-walled cylindrical workpiece turning clamping method, fixture and processing unit (plant) - Google Patents
A kind of thin-walled cylindrical workpiece turning clamping method, fixture and processing unit (plant) Download PDFInfo
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- CN109382532A CN109382532A CN201811488110.1A CN201811488110A CN109382532A CN 109382532 A CN109382532 A CN 109382532A CN 201811488110 A CN201811488110 A CN 201811488110A CN 109382532 A CN109382532 A CN 109382532A
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- thin
- cylindrical workpiece
- walled cylindrical
- support shaft
- support
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/40—Expansion mandrels
- B23B31/404—Gripping the work or tool by jaws moving radially controlled by conical surfaces
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- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The present invention relates to a kind of thin-walled cylindrical workpiece turning clamping method, fixture and processing unit (plant)s, including the first support shaft and the second supporting axis, one end of first support shaft and the second supporting axis is for connecting tightening mechanism, the tightening mechanism is used to apply thin-walled cylindrical workpiece both ends interior support force, the tightening mechanism is equipped with position limiting structure, the position limiting structure is used to limit the axial movement of thin-walled cylindrical workpiece, clamping method and fixture of the invention avoids piece-holder deformation and chatter problem, improves machining accuracy.
Description
Technical field
The present invention relates to Technology for Turning Machining fields, and in particular to a kind of thin-walled cylindrical workpiece turnery processing clamping method,
Fixture and processing unit (plant).
Background technique
The processing method and tooling of existing thin-walled cylindrical workpiece mainly have: first is that most general in excircle of workpiece added resilience
The radial clamping of set is fixed with scroll chuck method of clamping, which is easy that workpiece generation clamping deformation, precision is made to reduce, is raw
Produce low efficiency；Second is that integrated shaft type is fixed, allows workpiece to cover on axis and both ends are fixed, the media fillers such as intermediate rubber, paraffin,
Since process engineering generates heat so medium has thawing, filling is uneven, therefore workpiece is easy to cause to generate chatter phenomenon.One
The solid shaft type of body, makes machine tool chief axis undertake bigger load, machining accuracy can be made to reduce；Third is that a kind of flange plate type clamp fixture,
Using ring flange, sleeve, mandrel and driving structure is held out against, processing method fixture design is complicated, increases processing cost.
Summary of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of thin-walled cylindrical workpiece turning clamping side
Method avoids precision problem caused by the deformation of workpiece caused by thin-walled cylindrical workpiece routine installation way and flutter.
To achieve the above object, the present invention adopts the following technical solutions:
A kind of thin-walled cylindrical workpiece turning clamping method applies along thin-walled cylindrical workpiece axis direction thin-walled cylindrical workpiece both ends
Clamping force, limit the axial movement of thin-walled cylindrical workpiece, apply along thin-walled cylindrical workpiece radial direction at thin-walled cylindrical workpiece both ends and
Stepless action is applied in thin-walled cylindrical workpiece inner surface and towards the interior support force on the outside of thin-walled cylindrical workpiece using thin-walled cylindrical workpiece both ends
The interior support force added is clamped thin-walled cylindrical workpiece.
The invention also discloses a kind of thin-walled cylindrical workpiece turning clamp, including the first support shaft and the second support shaft,
One end of one support shaft and the second support shaft is for connecting tightening mechanism, and the tightening mechanism is for applying thin-walled cylindrical workpiece both ends
Add interior support force, the tightening mechanism is equipped with position limiting structure, and the position limiting structure is used to limit the axial movement of thin-walled cylindrical workpiece.
Further, one end that the first support shaft and the second support shaft are used to connect tightening mechanism is equipped with pyramid type structure,
The pyramid type structural outer surface is equipped with the first helicitic texture, and the other end of the second support shaft is equipped with center hole.
Further, the tightening mechanism includes multiple inner supporting members, and the inner supporting member includes the inner support short beam being fixedly connected
And interior supporting tooth block, the interior supporting tooth block bottom end face are fixedly connected with inner support short beam, top end surface is and the pyramid type structure
Think matched inclined surface, the second helicitic texture to match with the first helicitic texture is machined on the inclined surface.
Further, the inner support short beam is arc panel, and multiple inner support short beams can be spliced to form from beginning to end and thin-walled cylindrical workpiece
The cylindrical structure to match.
Further, first helicitic texture and the second helicitic texture are all made of triangle fine thread structure, self-locking
Property is good.
Further, the position limiting structure is the boss that inner support short beam end is arranged in, and the boss can be with thin-walled cylinder
The end face of part contacts.
Further, the inner support short beam it is fixed in the end face of supporting tooth block end face opposite side be smooth arc-shaped surface, be used for and thin-walled
The contact of cylindrical element inner surface, prevents the damage to thin-walled cylindrical workpiece inner surface.
The invention also discloses a kind of thin-walled cylindrical workpiece turning processing unit (plant)s, use including the thin-walled cylindrical workpiece turning
Fixture and turning machine, first support shaft with the workpiece rotation driving mechanism of turning machine for connecting, and described second
Support axis is used to connect the tailstock tool of turning machine.
The invention also discloses a kind of application methods of thin-walled cylindrical workpiece turning clamp: the following steps are included:
Step 1: tightening mechanism being placed on the inside of thin-walled cylindrical workpiece both ends, position limiting structure is against the end face of thin-walled cylindrical workpiece
On, the first support shaft and the second support shaft are threadedly coupled with the tightening mechanism at thin-walled cylindrical workpiece both ends respectively, screw in first
Axis and the second support shaft are supportted, the first support shaft and the second support shaft drive tightening mechanism to apply interior support force to thin-walled cylindrical workpiece, directly
It combines closely to tightening mechanism and thin-walled cylindrical workpiece.
Step 2: the first support shaft being fixedly connected with the workpiece rotation driving mechanism of turning machine, by the machine of turning machine
Tailstock seat holds out against the second support shaft.
Beneficial effects of the present invention:
1. thin-walled cylindrical workpiece turning clamping method of the invention applies support force in symmetrical to workpiece two sides, makes workpiece
Both ends internal symmetry stretching does not use media filler, avoids the clamping deformation of workpiece in conventional processes and cutting force, cuts
Thermally-induced medium is cut to melt, fill unevenly to generate precision problem caused by flutter.
2. fixture of the invention, structure is simple, and manufacturing cost is low, using the first support shaft, the second support shaft and it is multiple in
Support member applies support force in symmetrical to workpiece, and clamp weight is light, and the main shaft carrying of turning machine workpiece rotation driving mechanism is born
It carries low.
3. fixture of the invention, inner supporting member passes through triangle fine thread structure on inclined surface and the first support shaft and second
Triangle fine thread structure on support shaft conical structure is threadedly coupled, and self-locking property is good, the first support shaft and the second support
Axis screws in the cylindrical structure diameter that the inner support short beam of inner supporting member can be made to be formed and becomes larger, and meets different rulers within the scope of certain diameter
The clamping demand of very little workpiece, use are more flexible.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not constitute the restriction to the application for explaining the application.
Fig. 1 is clamping method schematic illustration of the present invention；
Fig. 2 is A in Fig. 1 to schematic diagram；
Fig. 3 is the first axle assemble supporting schematic diagram of the invention；
Fig. 4 is inner supporting member structural schematic diagram of the present invention；
Fig. 5 is inner supporting member assembled state schematic diagram of the present invention；
Fig. 6 is present clip and thin-walled cylindrical workpiece assembling schematic diagram；
Wherein, 1. first support shaft, 1-1. pyramid type structure, 2. second support shafts, 2-1. center hole, 3. inner supporting members, 3-
1. inner support short beam, supporting tooth block in 3-2., the inclined surface 3-2-1., 4. boss, 5. thin-walled cylindrical workpieces.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As background technique is introduced, existing thin-walled cylindrical workpiece turning with installation way be easy to produce clamping deformation and
Flutter, to cause machining accuracy low, in view of the above-mentioned problems, present applicant proposes a kind of thin-walled cylindrical workpiece turning clamping sides
Method.
A kind of thin-walled cylindrical workpiece turning clamping method applies along thin-walled cylindrical workpiece axis direction thin-walled cylindrical workpiece both ends
Clamping force, limit the axial movement of thin-walled cylindrical workpiece, apply along thin-walled cylindrical workpiece radial direction at thin-walled cylindrical workpiece both ends and
Stepless action is applied in thin-walled cylindrical workpiece inner surface and towards the interior support force on the outside of thin-walled cylindrical workpiece using thin-walled cylindrical workpiece both ends
The interior support force added is clamped thin-walled cylindrical workpiece.
Using such clamping method, without the media such as filled rubber, paraffin inside thin-walled cylindrical workpiece, so as to avoid because
Workpiece chatter problem caused by medium caused by cutting force, cutting heat melts, filling is uneven applies inner support using workpiece both ends
Power avoids problem of workpiece deformation caused by traditional radial clamping or scroll chuck clamping using added resilience set, improves
Machining accuracy.
The invention also discloses a kind of matching used fixture of thin-walled cylindrical workpiece turning clamping method, the application's
In one exemplary embodiment, the fixture includes the first support shaft 1 and the second support shaft 2 made of No. 45 steel, in use,
First support shaft and the second support shaft are located at the two sides of thin-walled cylindrical workpiece, and the one of first support shaft and the second support shaft
Side end can connect tightening mechanism, and the first support shaft and the second support shaft can be by tightening mechanisms in the end of thin-walled cylindrical workpiece
Side surface applies interior support force, position limiting structure is additionally provided on the tightening mechanism, the position limiting structure is used for and thin-walled cylindrical workpiece
End face is in close contact, and prevents the axial movement of thin-walled cylindrical workpiece in process.
The end that first support shaft and the second support shaft are used to connect tightening mechanism side is equipped with pyramid type structure 1-
1, the outer circumference surface of the pyramid type structure is equipped with the first helicitic texture, and first helicitic texture uses triangle closely-pitched spiral shell
Line structure, the end side center of second support shaft 2 are machined with center hole 2-1, and the center hole uses drilling processing
And reconditioning is carried out to reach required precision, for connecting with turning machine tailstock, turning machine tailstock can pass through center hole
Pressure is applied to the second support shaft.
The tightening mechanism includes the identical inner supporting member 3 of three shapes, and the inner supporting member is made of No. 45 steel, the inner support
Part includes the inner support short beam 3-1 being welded and fixed and interior supporting tooth block 3-2, and the inner support short beam is arc panel, the arc of the arc panel
Degree is 120 °, and the mutually splicing from beginning to end of three arc panels may make up the cylindrical knot to match with thin-walled cylindrical workpiece shape to be processed
Structure, the interior supporting tooth block bottom face are welded on arc panel, and the block welding of inner support tooth is in the end face of arc panel center of circle side
Portion, the top end face of the interior supporting tooth block are the inclined surface 3- to match with the pyramid type structure of the first support shaft or the second support shaft
2-1, the inclined surface are equipped with the second helicitic texture to match with the first helicitic texture, and second helicitic texture uses three
Angular fine thread structure, the first helicitic texture and the second helicitic texture are all made of triangle fine thread structure, self-locking property
Good, for the inside face contact with thin-walled cylindrical workpiece, which is thrown for the end face of the arc panel center of circle side opposite side
Light processing forms smooth arc-shaped surface, and roughness is lower, smaller to the internal surface damage of thin-walled cylindrical workpiece.
The position limiting structure is vertically arranged using the boss 4 for being fixed on inner support short beam end, the boss with inner support short beam,
It forms L-type structure and limits thin-walled cylindrical workpiece in use, one side end face of the boss can be contacted with the end face of thin-walled cylindrical workpiece
Axial movement in process, while ensure that the depth of parallelism of inner supporting member and thin-walled cylindrical workpiece.
The invention also discloses a kind of thin-walled cylindrical workpiece turning machining devices, including the fixture and turning machine, institute
Turning machine is stated using existing turning machine, first support shaft is for the workpiece rotation driving machine with turning machine
The main shaft of structure connects, and for second support shaft for connecting with the tailstock tool of turning machine, tailstock tool can hold out against second
Support axis.
The invention also discloses a kind of application methods of thin-walled cylindrical workpiece turning clamp, comprising the following steps:
Step 1: three inner supporting members will be put into inside one end of thin-walled cylindrical workpiece 5, the inner support short beam of inner supporting member passes through arc
The curved end of plate center of circle side opposite side is contacted with the inner side end of thin-walled cylindrical workpiece, the boss being arranged on inner support short beam with
The end face of thin-walled cylindrical workpiece contacts, and manually adjusts the position of three inner supporting members, makes three inner supporting members along thin-walled cylindrical workpiece circumference side
To being uniformly distributed, the pyramid type structure of the first support the end of the shaft is threadedly coupled with three interior supporting tooth blocks, rotates the first support shaft,
Move the first support shaft to thin-walled cylindrical workpiece internal direction along thin-walled cylindrical workpiece axis, due to the first support shaft and interior supporting tooth block
For the threaded connection on inclined surface, the movement of the first support shaft will drive three interior supporting tooth blocks along thin-walled cylindrical workpiece radial direction to
The movement of thin-walled cylindrical workpiece lateral direction applies interior support force to the inner surface of thin-walled cylindrical workpiece, until inner support short beam stretching thin-wall circular
Cylinder part makes inner supporting member that can not produce relative rotation with thin-walled cylindrical workpiece, using identical method by three inner supporting members and second
Support axis is installed to the end side of thin-walled cylindrical workpiece.
Step 2: the first support shaft being fixedly connected with the main shaft of the workpiece rotation driving mechanism of turning machine, operates turning
Tailstock tool is compressed the second support shaft by the center hole in the second support shaft, realizes thin-wall circular by the tailstock tool of lathe
The limitation that cylinder part is axially moved.
Fixture of the invention, structure is simple, easy to process, light-weight, reduces the load of the main shaft of turning machine, and
Using support force in applying to thin-walled cylindrical workpiece both ends, the clamping deformation of thin-walled cylindrical workpiece will not be generated, entire clamping process is not necessarily to
The media such as filled rubber, paraffin, avoiding generation heat in process keeps medium thawing or media filler unevenly caused
Chatter phenomenon, improves machining accuracy.
Fixture of the invention, the approximately equal thin-walled cylindrical workpiece work of cylindrical structure diameter suitable for being formed with arc panel
The clamping of part, the first support shaft and the second support shaft screw-in depth are different, are suitable for different-diameter thin-walled within the scope of certain diameter
The clamping demand of cylindrical element, improves the applicability of fixture.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of thin-walled cylindrical workpiece turning clamping method, which is characterized in that apply thin-walled cylindrical workpiece both ends along thin-walled cylinder
The clamping force of part axis direction limits the axial movement of thin-walled cylindrical workpiece, applies at thin-walled cylindrical workpiece both ends along thin-walled cylindrical workpiece
Radial direction and stepless action is in thin-walled cylindrical workpiece inner surface and towards the interior support force on the outside of thin-walled cylindrical workpiece, utilizes thin-wall circular
The interior support force that cylinder part both ends apply is clamped thin-walled cylindrical workpiece.
2. a kind of thin-walled cylindrical workpiece turning clamp, which is characterized in that including the first support shaft and the second support shaft, the first support
One end of axis and the second support shaft is used to apply inner support to thin-walled cylindrical workpiece both ends for connecting tightening mechanism, the tightening mechanism
Power, the tightening mechanism are equipped with position limiting structure, and the position limiting structure is used to limit the axial movement of thin-walled cylindrical workpiece.
3. a kind of thin-walled cylindrical workpiece turning clamp as claimed in claim 2, which is characterized in that the first support shaft and second
One end that support axis is used to connect tightening mechanism is equipped with pyramid type structure, and the pyramid type structural outer surface is equipped with the first screw thread knot
The other end of structure, the second support shaft is equipped with center hole.
4. a kind of thin-walled cylindrical workpiece turning clamp as claimed in claim 3, which is characterized in that the tightening mechanism includes more
A inner supporting member, the inner supporting member include the inner support short beam and interior supporting tooth block being fixedly connected, the interior supporting tooth block bottom end face with it is interior
Support short beam is fixedly connected, and top end surface is with the pyramid type structure to think matched inclined surface, be machined on the inclined surface with
The second helicitic texture that first helicitic texture matches.
5. a kind of thin-walled cylindrical workpiece turning clamp as claimed in claim 4, which is characterized in that the inner support short beam is arc
Plate, multiple inner support short beams can be spliced to form the cylindrical structure to match with thin-walled cylindrical workpiece from beginning to end.
6. a kind of thin-walled cylindrical workpiece turning clamp as claimed in claim 4, which is characterized in that first helicitic texture and
Second helicitic texture is all made of triangle fine thread structure.
7. a kind of thin-walled cylindrical workpiece turning clamp as claimed in claim 4, which is characterized in that the position limiting structure is setting
Boss in inner support short beam end.
8. a kind of thin-walled cylindrical workpiece turning clamp as claimed in claim 4, which is characterized in that in the inner support short beam is fixed
The end face of supporting tooth block end face opposite side is smooth arc-shaped surface, for contacting with thin-walled cylindrical workpiece inner surface.
9. a kind of thin-walled cylindrical workpiece turning processing unit (plant), which is characterized in that including the described in any item thin-walleds of claim 2-8
Cylindrical element turning clamp and turning machine, first support shaft are used to connect with the workpiece rotation driving mechanism of turning machine
It connects, second support shaft is used to connect the tailstock tool of turning machine.
10. a kind of application method of the described in any item thin-walled cylindrical workpiece turning clamps of claim 2-8, which is characterized in that
The following steps are included:
Step 1: tightening mechanism is placed on the inside of thin-walled cylindrical workpiece both ends, position limiting structure is against on the end face of thin-walled cylindrical workpiece,
First support shaft and the second support shaft are threadedly coupled with the tightening mechanism at thin-walled cylindrical workpiece both ends respectively, screw in the first support shaft
And second support shaft, the first support shaft and the second support shaft drive tightening mechanism to thin-walled cylindrical workpiece apply in support force, until support
Tight mechanism combines closely with thin-walled cylindrical workpiece；
Step 2: the first support shaft being fixedly connected with the workpiece rotation driving mechanism of turning machine, by the lathe tail of turning machine
Seat holds out against the second support shaft.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811488110.1A CN109382532A (en) | 2018-12-06 | 2018-12-06 | A kind of thin-walled cylindrical workpiece turning clamping method, fixture and processing unit (plant) |
| CN201910309927.6A CN109822123B (en) | 2018-12-06 | 2019-04-17 | Clamping method, clamp and machining device for turning thin-wall cylindrical part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811488110.1A CN109382532A (en) | 2018-12-06 | 2018-12-06 | A kind of thin-walled cylindrical workpiece turning clamping method, fixture and processing unit (plant) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109382532A true CN109382532A (en) | 2019-02-26 |
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ID=65429636
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811488110.1A Pending CN109382532A (en) | 2018-12-06 | 2018-12-06 | A kind of thin-walled cylindrical workpiece turning clamping method, fixture and processing unit (plant) |
| CN201910309927.6A Active CN109822123B (en) | 2018-12-06 | 2019-04-17 | Clamping method, clamp and machining device for turning thin-wall cylindrical part |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910309927.6A Active CN109822123B (en) | 2018-12-06 | 2019-04-17 | Clamping method, clamp and machining device for turning thin-wall cylindrical part |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN109382532A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111112954A (en) * | 2020-01-03 | 2020-05-08 | 中国船舶重工集团公司第七0七研究所 | Finish machining process method for inner cavity of floating drum of liquid floated gyroscope |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111195736B (en) * | 2020-01-19 | 2021-05-04 | 重庆众联齿轮传动有限公司 | Ring sleeve type part clamping and positioning device and ring sleeve type part machining method |
| CN111230164B (en) * | 2020-02-03 | 2021-04-20 | 大连理工大学 | Clamping method of automatic inner supporting clamp for thin-wall cylindrical part |
| CN113020657B (en) * | 2021-03-19 | 2022-04-08 | 重庆运城制版有限公司 | Short version bore hole processingequipment |
| CN113458433A (en) * | 2021-07-28 | 2021-10-01 | 宜春市诚顺机械制造有限公司 | Clamping tool for processing external thread of large thin-wall cylinder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2807353B1 (en) * | 2000-04-10 | 2002-05-31 | Alain Marchand | SUPPLIER FOR MACHINE TOOL |
| DE20314255U1 (en) * | 2003-09-13 | 2003-11-06 | Isad Electronic Sys Gmbh & Co | Rapid clamping chuck for spinning thin workpieces has a threaded fastener with two interacting tapering thrust sleeves to grip the inside of the mounting aperture of the workpiece |
| CN201783844U (en) * | 2010-07-28 | 2011-04-06 | 中国石油天然气集团公司 | Combined fixture for fast turning outer diameters of thin-walled long pipe workpieces |
| CN203830761U (en) * | 2013-04-08 | 2014-09-17 | 浙江同泰泵业有限公司 | Inner expansion type positioning fixture |
| CN103737048A (en) * | 2013-12-27 | 2014-04-23 | 滨州盟威斯林格缸套有限公司 | Clamp special for thin wall cylinder excircle turning |
| CN206356652U (en) * | 2016-12-30 | 2017-07-28 | 深圳市晟达真空钎焊技术有限公司 | Light-wall pipe form tolerance control tool |
| CN206779497U (en) * | 2017-06-09 | 2017-12-22 | 江西江铃底盘股份有限公司 | A kind of blank materials in the tube cylindrical turning device |
| CN108480672A (en) * | 2018-06-06 | 2018-09-04 | 福州大学 | For the special fixture and its working method of slim cylindrical element turnery processing |
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2018
- 2018-12-06 CN CN201811488110.1A patent/CN109382532A/en active Pending
-
2019
- 2019-04-17 CN CN201910309927.6A patent/CN109822123B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111112954A (en) * | 2020-01-03 | 2020-05-08 | 中国船舶重工集团公司第七0七研究所 | Finish machining process method for inner cavity of floating drum of liquid floated gyroscope |
| CN111112954B (en) * | 2020-01-03 | 2021-07-27 | 中国船舶重工集团公司第七0七研究所 | Finish machining process method for inner cavity of floating drum of liquid floated gyroscope |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109822123A (en) | 2019-05-31 |
| CN109822123B (en) | 2020-10-02 |
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Application publication date: 20190226 |