CN106493520A - A kind of processing method of thin-walled elastic ring - Google Patents
A kind of processing method of thin-walled elastic ring Download PDFInfo
- Publication number
- CN106493520A CN106493520A CN201611049154.5A CN201611049154A CN106493520A CN 106493520 A CN106493520 A CN 106493520A CN 201611049154 A CN201611049154 A CN 201611049154A CN 106493520 A CN106493520 A CN 106493520A
- Authority
- CN
- China
- Prior art keywords
- thin
- walled
- die
- bending
- shaped part
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/01—Aircraft parts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A kind of processing method of thin-walled elastic ring, belongs to aero-engine technology field, and methods described comprises the steps：Annular blank part is processed into annular thin-wall parts by machining；Mechanical bending, the boss of part is plugged in the location hole of bending female die of die, and thin-walled ring end face place plane is bent into the low saddle in middle high both sides；Stress relief annealing, the thin-walled elasticity shaped part after bending is processed are put in heating furnace and carry out stress relief annealing；School type, the boss of part is plugged in the location hole of bending female die of die, manual calibration part shape, it is ensured that gap is not more than 0.35mm between part and molding surface；Sizing heat treatment, including quenching, in advance tempering and sizing tempering three phases；Product checking, the thin-walled elasticity shaped part qualified to dimension control carry out nondestructive inspection.The method of the invention can effectively improve the crudy of thin-walled elasticity shaped part, solve thin-walled elasticity shaped part and be also easy to produce deformation after heat treatment of shaping and the problems such as face crack.
Description
Technical field
The invention belongs to aero-engine technology field, more particularly to a kind of processing method of thin-walled elastic ring.
Background technology
The elastic shaped part of some thin-walleds can be often used in aero-engine, and the difficulty of processing of this kind of part is larger.Mesh
The method adopted by the processing of front such thin-walled elasticity shaped part for：Machining is carried out first, by machining by blank
Part is processed into thin-walled shaped part；Bending processing is carried out to thin-walled shaped part afterwards, thin-walled shaped part is bent into by spy by mould
Fixed shape, to make it have enough elasticity；Finally to bending after thin-walled shaped part carry out sizing heat treatment, make part exist
Keep, while given shape, there is enough intensity.
But, due to being affected by thin-wall construction, the rigidity of this kind of elastic shaped part is poor, and part is adding through machinery
Larger residual stress can be produced after work and bending processing, so as to cause after sizing heat treatment, can be in piece surface or transition
The small crackle of the positions such as fillet generation, and increase the deformation of part after heat treatment, affect the normal use of part.Therefore, need
Want a kind of new processing method to solve the problems referred to above that prior art is present when thin-walled elasticity shaped part is processed.
Content of the invention
For the problem that prior art is present, the present invention provides a kind of processing method of thin-walled elastic ring, and the method has
Stronger practicality, can effectively improve the crudy of thin-walled elasticity shaped part, solve thin-walled elasticity shaped part in sizing heat
The problems such as being also easy to produce deformation and face crack after process.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of processing method of thin-walled elastic ring, comprises the steps：
Step one：Annular blank part is clamped in Digit Control Machine Tool by machining, is processed into annular thin-wall parts, thin-walled ring
Shape part includes thin-walled ring, is symmetrily processed with two boss in the axial direction in thin-walled ring end face, adds between boss and thin-walled ring
Work has the knuckle that transition connects, and ensures that the surface roughness of annular thin-wall parts reaches 1.6 μm, inside and outside thin-walled ring after processing
The dimensional tolerance in footpath is controlled within 0.15mm, and the manual various sharp burr for removing processing generation, to entering at knuckle
Row polishing；
Step 2：Mechanical bending, bending mould lie against press bending apparatus, and the boss of part is plugged in bending female die of die
Location hole in, it is ensured that after part positioning stablity, make the punch of bending mould be aligned and die start press bending apparatus, press-bending sets
Standby drive punch is moved downward, and makes thin-walled ring end face fit with molding surface, during thin-walled ring end face place plane is bent into
Between the low saddle in high both sides；
Step 3：Stress relief annealing, the thin-walled elasticity shaped part after bending is processed are put in heating furnace, are heated to its institute
From the stress relief annealing temperature range of material, furnace cooling after insulation 1-4 hours；
Step 4：School type, the boss of part is plugged in the location hole of bending female die of die, manual calibration part shape
Shape, makes thin-walled elasticity shaped part be brought into close contact with molding surface, it is ensured that gap is not more than 0.35mm between part and molding surface；
Step 5：Sizing heat treatment, including quenching, in advance tempering and sizing tempering three phases, zero after first high-ranking officers' type
Part is put in heating furnace, is quenched in the range of the hardening heat for being heated to material selected by which, and oil cooling is to room temperature；After quenching,
Part free state is put in heating furnace and is tempered in advance, be heated to the tempering range of material selected by which, be incubated
10-30 minutes, and water-cooled is to room temperature；Parts fixation after being tempered in advance is put in heating furnace on mould and is shaped back
Fire, it is ensured that the dimensionally stable of part and resilience does not occur, temperature is heated in the tempering range of material selected by which, is protected
Warm 2-3 hours, water-cooled complete heat treatment of all shaping to room temperature；
Step 6：Product checking, the thin-walled elasticity shaped part qualified to dimension control carry out nondestructive inspection.
Bending mould described in step 2 includes that upper die plate and lower template, upper die plate and lower template are individually fixed in press-bending and set
Standby upper mounting plate and lower platform, are fixed with punch on upper die plate, be fixed with die in lower template, and the upper surface of die is provided with cambered surface
Groove, cambered surface groove and the punch of die match, and are provided with two through holes, two through hole distances and thin-walled elasticity in bottom portion of groove
On shaped part, the distance between two boss are identical, are provided with locating piece in through hole, and locating piece middle setting has location hole, positioning
Block can be moved up and down along through hole, connected by spring between locating piece and lower template, during spring free state, the upper table of locating piece
Face is generally aligned in the same plane interior with the upper surface of die.
Nondestructive inspection described in step 6 is the magnetic crack detection carried out using magnetic crack detector.
Beneficial effects of the present invention：
The present invention has supplied a kind of processing method of thin-walled elastic ring, the method to there is stronger practicality, can effectively improve
The crudy of thin-walled elasticity shaped part.The present invention has been carried out going to answer to the thin-walled elasticity shaped part after bending processing in step 2
Power process, effectively one machining of removal step and step 2 machinery bending in the residual stress produced by inside parts, can change
The stress state of kind inside parts, reduces impact of the residual stress to part status after heat treatment of shaping, thin so as to solve
Wall elasticity shaped part is also easy to produce at deformation, face crack and knuckle iso-stress concentration after sizing heat treatment and cracks
Problem, improves the stability of the crudy and the course of processing of part.Step 4 school type has been carried out after destressing is processed,
The step process corrects resilience and the deformation that part is produced before this, is conducive to the control of processed accessory size, makes zero
Size and dimension under part entrance during step operation is more accurate.
Description of the drawings
Fig. 1 is the dimensional structure diagram of thin-walled elasticity shaped part；
Fig. 2 is the front view of thin-walled elasticity shaped part；
Fig. 3 is the A-A sectional views of Fig. 2；
Fig. 4 is bending mould structure schematic diagram；
Fig. 5 is the top view of bending mould lower template and die；
In figure：1- thin-walled rings, 2- boss, 3- knuckles, 4- upper die plates, 5- lower templates, 6- punch, 7- dies, 8- are recessed
Groove, 9- through holes, 10- locating pieces, 11- location holes, 12- springs.
Specific embodiment
Example is processed as with the thin-walled elasticity shaped part of T11 materials below in conjunction with the accompanying drawings, the present invention is done further detailed
Explanation.
As shown in Figures 1 to 5, a kind of processing method of thin-walled elastic ring, belongs to aero-engine technology field, for navigating
The processing of thin-walled elasticity shaped part in empty electromotor.
The processing method of thin-walled elastic ring of the present invention comprises the steps：
Step one：Machining.Annular blank part is clamped in Digit Control Machine Tool, annular thin-wall parts, thin-walled ring is processed into
Shape part includes thin-walled ring 1, is symmetrily processed with two boss 2 in the axial direction in 1 end face of thin-walled ring, boss 2 and thin-walled ring 1 it
Between be machined with transition connection knuckle 3, after processing ensure annular thin-wall parts surface roughness reach 1.6 μm, thin-walled
The dimensional tolerance of ring internal-and external diameter is controlled within 0.15mm, and the manual various sharp burr for removing processing generation, to transition circle
It is processed by shot blasting at angle.The annular thin-wall parts dimensional uniformity that processed using Digit Control Machine Tool is high, surface roughness is good
And product quality is more stable.
Step 2：Mechanical bending.Annular thin-wall parts for making to process in step one have elasticity, need to be by circular thin-wall zero
Part is installed on the bending mould of press bending apparatus carries out bending processing.In the present embodiment, bending mould includes upper die plate 4 with
Template 5, upper die plate 4 and lower template 5 are individually fixed in the upper mounting plate and lower platform of press bending apparatus, are fixed with punch on upper die plate 4
6, die 7 is fixed with lower template 5, the upper surface of die 7 is provided with cambered surface groove 8, the cambered surface groove 8 of die 7 and 6 phase of punch
Match somebody with somebody, for the part that bends, the degree of crook of part can be controlled by the size of adjustment groove 8, so that part acquisition is different
Elasticity.Two through holes 9 are provided with 8 bottom of groove, two through holes 9 are between two boss 2 on thin-walled elasticity shaped part
Apart from identical, in through hole 9, locating piece 10 is provided with, 10 middle setting of locating piece has location hole 11, and locating piece 10 can be along through hole 9
Lower movement, is connected by spring 12 between locating piece 11 and lower template 5, during 12 free state of spring, the upper surface of locating piece 10
It is generally aligned in the same plane with the upper surface of die 7 interior.
When spring 12 is in free state, the boss 2 of part is plugged in location hole 11, it is ensured that part positioning stablity
Afterwards, the alignment die 7 of punch 6 is made, and starts press bending apparatus, press bending apparatus upper mounting plate drives the punch 6 of bending mould to move downward,
The end face and 8 surface of groove on die 7 for making annular thin-wall parts fits, and annular thin-wall parts end face place plane is bent
Into the low saddle in middle high both sides so as to obtain elasticity.
Step 3：Stress relief annealing.Stress relief annealing is carried out to the thin-walled elasticity shaped part after bending processing in step 2,
Stress relief annealing can effectively one machining of removal step and step 2 machinery bending in the residual stress produced by inside parts,
Improve the stress state of inside parts, reduce caused part deformation and face crack etc. because of the presence of residual stress and ask
Topic, improves crudy and the processing stability of part, is that subsequently sizing heat treatment step has established favourable basis, and
Part rebound phenomenon step 2 processing after produced by is preferably overcome.
In the present embodiment, by the thin-walled elastic ring Cleaning of Parts of the T11 materials after bending processing in step 2 totally simultaneously
Dry, be placed on pallet afterwards, part is steadily put in vacuum drying oven together with pallet, charging temperature is more than or equal to 150 DEG C,
550 DEG C -600 DEG C are at the uniform velocity warming up to, and are incubated 40-60 minutes afterwards, argon (0.2-0.4) MPa are filled with into stove, are cooled to the furnace
Less than 80 DEG C air coolings of coming out of the stove, complete the stress relief annealing of part.
Step 4：School type.For correcting resilience and the deformation that part is produced before this, be conducive to the control of accessory size
System, the size and dimension under entering part during step operation are more accurate.In the present embodiment, by the convex of thin-walled elasticity shaped part
Platform 2 is plugged in the location hole 11 of bending female die of die, manual calibration part shape, is made on thin-walled elasticity shaped part and die 7
8 surface of groove be brought into close contact, it is ensured that between part and molding surface, gap is not more than 0.35mm；
Step 5：Sizing heat treatment.Meet can the performance indications such as the consistency and elasticity of part by heat treatment of shaping makes
With requiring, and to bending after part play a part of solid shape, including quenching, in advance tempering and sizing three ranks of tempering
Section.As stress relief annealing has been carried out in step 3, eliminate the residual stress in part, improve the internal stress of part
State, so will not crack at the position such as thin-walled ring 1 or knuckle 3 when high temperature carries out sizing heat treatment or cause zero
The resilience of part.In the present embodiment, sizing heat treatment is carried out as claimed below.
Quenching.Part after high-ranking officers' type is put in heating furnace and is heated to 800 ± 10 DEG C, is incubated 8-10 minutes, oil cooling afterwards
To room temperature.The performances such as the thin-walled elasticity hardness of shaped part, intensity and wearability can be improved by Quenching Treatment, and adopt the oil cooling can
Reduce deflection and tearing tendency of the part in quenching.
It is tempered in advance.Thin-walled elasticity shaped part free state after by quenching is flat on pallet, is put in heating furnace and is added
Heat is incubated 15-20 minutes to 380 ± 10 DEG C, and water-cooled is to room temperature afterwards.Due to thin-walled elasticity shaped part hardness after quenching compared with
Height, directly clamping on mould carries out being also easy to produce crackle during sizing tempering or brittle failure occurs, and therefore, first arranges before sizing tempering
It is tempered in advance, to adjust the hardness after thin-walled elastic ring parts quenching, can be come by using hardness test block after being tempered in advance
Carry out detecting whether the hardness of part meets the requirements.
Sizing tempering.By the thin-walled elastic ring parts fixation after being tempered in advance on mould, it is ensured that the dimensionally stable of part
And there is no resilience, and it is put in heating furnace afterwards and is heated to 380-400 DEG C, is incubated 2.5-3 hours, water-cooled is to room temperature.Shape back
The hardness of the adjustable part of fire, intensity, plasticity and toughness are to reach use requirement, while the size of energy stabilizer elements, it is ensured that essence
Degree, and the part internal stress produced in quenching is eliminated, prevent to deform and ftracture.
Step 6：Product checking.After sizing heat treatment, need to re-start accessory size inspection veritification, to chi
Very little qualified part carries out nondestructive inspection again, whether there is the defects such as the crackle for affecting product normally to use to check.In the present embodiment
In, magnetic crack detection is carried out using magnetic crack detector to the thin-walled elasticity shaped part of T11 materials, checks that piece surface and superficial face are
No have crackle.
Step 7：Warehouse-in.Will be standby for the thin-walled elasticity shaped part warehouse-in for detecting qualified in step 6.
Above example is only unrestricted in order to technical scheme to be described, although with reference to preferred embodiment to this
Bright be described in detail, it will be appreciated by those skilled in the art that can modify to technical scheme or wait
With replacing, without deviating from the objective and scope of the technical program, which all should be covered in scope of the presently claimed invention.
Claims (3)
1. a kind of processing method of thin-walled elastic ring, for the processing of thin-walled elasticity shaped part in aero-engine, its feature exists
In comprising the steps：
Step one：Annular blank part is clamped in Digit Control Machine Tool by machining, is processed into annular thin-wall parts, circular thin-wall zero
Part includes thin-walled ring, is symmetrily processed with two boss in the axial direction in thin-walled ring end face, is machined between boss and thin-walled ring
The knuckle of transition connection, ensures after processing that the surface roughness of annular thin-wall parts reaches 1.6 μm, thin-walled ring internal-and external diameter
Dimensional tolerance is controlled within 0.15mm, and the manual various sharp burr for removing processing generation, to throwing at knuckle
Optical processing；
Step 2：Mechanical bending, bending mould lie against press bending apparatus, and the boss of part is plugged in determining for bending female die of die
In the hole of position, it is ensured that after part positioning stablity, the punch of bending mould is made to be directed at die and start press bending apparatus, press bending apparatus band
Dynamic punch is moved downward, and makes thin-walled ring end face fit with molding surface, and thin-walled ring end face place plane is bent into middle height
The low saddle in both sides；
Step 3：Stress relief annealing, the thin-walled elasticity shaped part after bending is processed are put in heating furnace, are heated to selected by which
The stress relief annealing temperature range of material, furnace cooling after insulation 1-4 hours complete to move back the destressing of thin-walled elasticity shaped part
Fire is processed；
Step 4：School type, the boss of part is plugged in the location hole of bending female die of die, and manual calibration part shape makes
Thin-walled elasticity shaped part is brought into close contact with molding surface, it is ensured that between part and molding surface, gap is not more than 0.35mm；
Step 5：Sizing heat treatment, including quenching, in advance tempering and sizing tempering three phases, the part after first high-ranking officers' type is put
Enter in heating furnace, quenched in the range of the hardening heat for being heated to material selected by which, oil cooling is to room temperature；After quenching, by zero
Part free state is put in heating furnace and is tempered in advance, is heated to the tempering range of material selected by which, is incubated 10-30
Minute, and water-cooled is to room temperature；Parts fixation after being tempered in advance is put in heating furnace on mould carries out sizing tempering, it is ensured that
The dimensionally stable of part and there is no resilience, temperature is heated in the tempering range of material selected by which, 2-3 is little for insulation
When, water-cooled completes heat treatment of all shaping to room temperature；
Step 6：Product checking, the thin-walled elasticity shaped part qualified to dimension control carry out nondestructive inspection.
2. the processing method of thin-walled elastic ring according to claim 1, it is characterised in that：Bending mould described in step 2
Including upper die plate and lower template, upper die plate and lower template are individually fixed in the upper mounting plate and lower platform of press bending apparatus, on upper die plate
Punch is fixed with, die in lower template, is fixed with, the upper surface of die is provided with cambered surface groove, the cambered surface groove of die and punch phase
Coupling, is provided with two through holes in bottom portion of groove, the distance between two through hole distances and two boss on thin-walled elasticity shaped part
Identical, locating piece is provided with through hole, locating piece middle setting has location hole, locating piece move up and down along through hole, locating piece
It is connected by spring between lower template, during spring free state, the upper surface of locating piece is located at same with the upper surface of die
In plane.
3. the processing method of thin-walled elastic ring according to claim 1, it is characterised in that：Nondestructive inspection described in step 6
It is the magnetic crack detection carried out using magnetic crack detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611049154.5A CN106493520B (en) | 2016-11-25 | 2016-11-25 | A kind of processing method of thin-walled elastic ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611049154.5A CN106493520B (en) | 2016-11-25 | 2016-11-25 | A kind of processing method of thin-walled elastic ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106493520A true CN106493520A (en) | 2017-03-15 |
| CN106493520B CN106493520B (en) | 2018-07-17 |
Family
ID=58328339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611049154.5A Active CN106493520B (en) | 2016-11-25 | 2016-11-25 | A kind of processing method of thin-walled elastic ring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106493520B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107598494A (en) * | 2017-09-28 | 2018-01-19 | 中国航发动力股份有限公司 | A kind of processing method of spiral elasticity back-up ring |
| CN108037176A (en) * | 2017-12-28 | 2018-05-15 | 贵州大学 | The quick hydrogen embrittlement inspection method of steel part and device |
| CN108971585A (en) * | 2018-08-24 | 2018-12-11 | 沈阳富创精密设备有限公司 | The processing technology of the big annular workpieces of equal slabs processing aluminum alloy strip countersunk head |
| CN111570874A (en) * | 2020-04-20 | 2020-08-25 | 哈尔滨汽轮机厂有限责任公司 | Elastic ring numerical control milling tool and milling method |
| CN113820299A (en) * | 2021-09-22 | 2021-12-21 | 山西柴油机工业有限责任公司 | Method for developing cracks at grinding end of valve top of high-power diesel engine in advance |
| CN113897476A (en) * | 2021-09-27 | 2022-01-07 | 中国航发哈尔滨东安发动机有限公司 | Process method for improving qualified rate of thin-wall elastic washer products and tempering tool |
| CN114231725A (en) * | 2021-12-02 | 2022-03-25 | 贵州航天精工制造有限公司 | Heat treatment method and heat treatment device for angular elastic washer |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0839936B1 (en) * | 1996-10-31 | 2002-07-17 | Kanai Juyo Kogyo Co., Ltd. | Production method of a spinning ring for a ring spinning machine |
| CN101448347B (en) * | 2008-12-30 | 2012-01-25 | 上海电气电站设备有限公司 | Method for manufacturing induction coil used for medium frequency induction heating |
| CN101935744A (en) * | 2010-10-08 | 2011-01-05 | 哈尔滨汽轮机厂有限责任公司 | Method for sizing metal material mechanical part by phase change superplasticity |
| CN104388863A (en) * | 2014-11-28 | 2015-03-04 | 沈阳飞机工业（集团）有限公司 | Method for heat treatment of large-sized titanium alloy frame parts by virtue of special-shaped blocks |
| CN105643221A (en) * | 2016-03-16 | 2016-06-08 | 芜湖东光大华机械制造有限公司 | Flywheel machining technology |
-
2016
- 2016-11-25 CN CN201611049154.5A patent/CN106493520B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107598494A (en) * | 2017-09-28 | 2018-01-19 | 中国航发动力股份有限公司 | A kind of processing method of spiral elasticity back-up ring |
| CN108037176A (en) * | 2017-12-28 | 2018-05-15 | 贵州大学 | The quick hydrogen embrittlement inspection method of steel part and device |
| CN108971585A (en) * | 2018-08-24 | 2018-12-11 | 沈阳富创精密设备有限公司 | The processing technology of the big annular workpieces of equal slabs processing aluminum alloy strip countersunk head |
| CN111570874A (en) * | 2020-04-20 | 2020-08-25 | 哈尔滨汽轮机厂有限责任公司 | Elastic ring numerical control milling tool and milling method |
| CN113820299A (en) * | 2021-09-22 | 2021-12-21 | 山西柴油机工业有限责任公司 | Method for developing cracks at grinding end of valve top of high-power diesel engine in advance |
| CN113820299B (en) * | 2021-09-22 | 2024-05-28 | 山西柴油机工业有限责任公司 | Method for enabling cracks of grinding end of valve top of high-power diesel engine to be displayed in advance |
| CN113897476A (en) * | 2021-09-27 | 2022-01-07 | 中国航发哈尔滨东安发动机有限公司 | Process method for improving qualified rate of thin-wall elastic washer products and tempering tool |
| CN114231725A (en) * | 2021-12-02 | 2022-03-25 | 贵州航天精工制造有限公司 | Heat treatment method and heat treatment device for angular elastic washer |
| CN114231725B (en) * | 2021-12-02 | 2024-05-10 | 贵州航天精工制造有限公司 | Heat treatment method and heat treatment device for elastic gasket with angle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106493520B (en) | 2018-07-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106493520A (en) | A kind of processing method of thin-walled elastic ring | |
| CN105583588B (en) | A kind of processing method for taper roll bearing Internal and external cycle | |
| CN102310315B (en) | Flat machine triangle processing technology | |
| CN101011777A (en) | Method and apparatus of forming cut deal laser prestress composite shot blasting | |
| CN108251608A (en) | A kind of high-temperature bearing steel bearings lasso shaping processing method | |
| CN105127683A (en) | Machining method for steel coordinate mechanical hand guide rail | |
| JP3572618B2 (en) | Method and apparatus for correcting tempering of rolling parts | |
| CN110293375A (en) | A kind of production technology of thin-wall bearing | |
| CN104032115B (en) | A kind of secondary gear circle that reduces nitrogenizes the heat treatment method of deformation | |
| CN104384879B (en) | Machining method of glass mold | |
| CN106119474A (en) | A kind of high-speed steel milling cutter Technology for Heating Processing | |
| US20090139092A1 (en) | Method and manufacturing of ball bearing rings | |
| CN103433419A (en) | Technology for processing chain | |
| CN101805882A (en) | Process for controlling deformation of gas nitrocarburizing part | |
| CN101513654B (en) | Straightening roller for cold rolling of wide and thick plate and manufacturing method thereof | |
| CN114346130B (en) | Precise machining control method and machining die for single-layer closed wave spring | |
| CN108866302A (en) | A kind of heat setting process of butterfly spring | |
| CN208304859U (en) | Caliper anti-deformation cubing | |
| CN208748141U (en) | A kind of cam laser thermal processing apparatus | |
| CN106583592A (en) | Preparation method of high-elasticity spiral retainer ring | |
| CN102814439A (en) | Hot-forging molding process of large-sized stainless steel nut | |
| CN108655977A (en) | Caliper anti-deformation cubing and its manufacturing method | |
| CN103878553B (en) | The processing method of high accuracy V-ring shape bearing assembly | |
| JPH09256058A (en) | Production of ring-shaped member | |
| CN109500152A (en) | A kind of gear ring school circle method and tooling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee after: Chinese Hangfa Shenyang Liming Aero engine limited liability company Address before: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee before: Liming Aeroplane Engine (Group) Co., Ltd., Shenyang City |
|
| CP01 | Change in the name or title of a patent holder |