CN109351815A - The hot orthopedic appliance of rolling bearing circle - Google Patents
The hot orthopedic appliance of rolling bearing circle Download PDFInfo
- Publication number
- CN109351815A CN109351815A CN201811630485.7A CN201811630485A CN109351815A CN 109351815 A CN109351815 A CN 109351815A CN 201811630485 A CN201811630485 A CN 201811630485A CN 109351815 A CN109351815 A CN 109351815A
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- China
- Prior art keywords
- set portion
- orthopedic
- rolling bearing
- bearing circle
- hot
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/16—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially adapted methods or means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/10—Making other particular articles parts of bearings; sleeves; valve seats or the like
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
The invention discloses a kind of hot orthopedic appliances of rolling bearing circle, its basic structure includes: portions, the portions have set portion and are formed in the end positioning region of set portion one end, and set portion is built-in with heating element, axial direction in set portion, one end where remembering end positioning region is first end, and one end opposite with first end is second end；Setting set, which is axially positioned on the second end in set portion, and extends to first end, and a cylinder of the set that shapes and set portion form shaft hole matching, another cylinder forms shaft hole matching with to orthopedic bearing race；And axial pressing device, the axial direction pressing device provide the pressure section of set portion axial direction, after being positioned at end positioning region with the first end in the bearing race, are pressed on the second end of the bearing race.Effectively rolling bearing circle can be carried out according to the present invention orthopedic.
Description
Technical field
The present invention relates to a kind of devices orthopedic for rolling bearing circle heat.
Background technique
Basic components of the rolling bearing as rotating machinery, rotating accuracy have the movement of equipment and dynamic characteristic
It has a major impact.In general, rolling bearing is made of lasso (inner ring and outer ring), rolling element (ball or roller) and retainer,
The form error of middle lasso is one of the principal element for influencing rolling bearing rotating accuracy.
It is well known that in the process of rolling bearing circle, such as rolling bearing circle is in thermally treated technique and grinding
After technique, the shape and size of rolling bearing circle can inevitably change, to generate form error.Particularly with
The relatively thin bearing race of wall thickness, for example, harmonic speed reducer flexible thin-walled bearing race and RV retarder thin-wall bearing circle,
The form error that process generates is more significant, is mainly reflected in cylindricity error and end face angularity error etc..
This kind of bearing race is relatively all bigger, such as pivoting support bearing, outside the bigger pivoting support bearing of individual
Diameter can be more than five meters, and used pivoting support bearing even on tower crane also has one meter or so.This class bearing is relatively
It is thin, such as code name is the bearing of 132.34.3550.03, internal diameter 3322mm, outer diameter 3868mm, thickness only has 189mm,
Thickness only has 0.049 times of outer diameter, and it is self-possessed up to 3454kg, and bearing race in process, easily generates shape
Variation.
For generated deformation in bearing race process, there is presently no effective solution methods.At present for super
Precise rolling bearing or thin-walled antifriction bearings are generallyd use and are scrapped or the excessive bearing of orthopedic method processing form error by hand
Circle can generate huge waste if directly scrapped, such as code name above-mentioned is the bearing of 132.34.3550.03, single-piece
Bearing race is self-possessed more than one ton, and it is excessive to scrap generated waste.And for orthopedic by hand, then worker needs more severe
(need to heat, to improve the plasticity of bearing race, cause ambient temperature very high) under environment with working experience carry out it is orthopedic,
Low efficiency, the job security of worker can not also ensure.
Summary of the invention
For current shortcoming to the not no good solution of the machining deformation of rolling bearing circle, it is an object of the invention to mention
Orthopedic device can be effectively carried out to rolling bearing circle for one kind.
Embodiment according to the present invention, provides a kind of hot orthopedic appliance of rolling bearing circle, and basic structure includes:
Portions, which has set portion and is formed in the end positioning region of set portion one end, and set portion is built-in with heating element, in set portion
Axial direction, remember end positioning region where one end be first end, one end opposite with first end be second end；
Setting set, the setting set are axially positioned on the second end in set portion, and extend to first end, and a cylinder of the set that shapes with
Set portion forms shaft hole matching, another cylinder forms shaft hole matching with to orthopedic bearing race；And
Axial pressing device, the axial direction pressing device provide the pressure section of set portion axial direction, with fixed in the first end of the bearing race
Behind the positioning region of end, it is pressed on the second end of the bearing race.
The above-mentioned hot orthopedic appliance of rolling bearing circle further includes optionally an orthopedic ring, the orthopedic ring is between end positioning region
Between the first end of setting set.
Optionally, there are gaps between setting set and end positioning region；
The axial length of orthopedic ring is greater than the width in gap, and forms axis hole between orthopedic ring and another cylinder of setting set and match
It closes.
Optionally, the thickness of orthopedic ring is greater than the wall thickness of the bearing race.
Optionally, setting set includes
Body, for cooperating with portions and bearing race；
Flange, positioned at the second end of body, with body one, the first end end face of the flange is supported on the second end end face in set portion
And form positioning.
Optionally, the end positioning region of the portions is a ring structure body；
Correspondingly, the first end in set portion is fixedly connected or constructs with the second end end face of ring structure body and is integrated；
Set portion and ring structure body coaxial line；
The outer diameter in set portion is less than the outer diameter of ring structure body, and the internal diameter in set portion is greater than the internal diameter of ring structure body.
Optionally, set portion is nested structure body, and forms inner-outer sleeve；
Heating element is arranged on the interface of inner-outer sleeve.
Optionally, helicla flute is provided on the interface of inner-outer sleeve；
Heating element is the heating wire laid along helicla flute.
Optionally, the axial pressing device is the axial hydraulic cylinder for being laid in the second end side of portions, the piston of hydraulic cylinder
Bar acts on the bearing race and constitutes the pressure section.
Optionally, the cylinder body of hydraulic cylinder is a barrel shape part, and bucket wall molds multiple oil pockets；
Oil pocket is using cylinder body axis as the array element of the annular array of axis；
Correspondingly, a piston rod is configured with for each oil pocket；
The oilhole of oil pocket is opened in the outside wall surface of barrel wall.
By analysis, the principal element for leading to rolling bearing circle machining deformation is processing thermal stress and processing cold stress, example
As processed flow harden produced by cold stress, flow harden will lead to bearing race and generate slowly deformation.The principle of the present invention is
Heated under a static pressure to orthopedic bearing race, make process thermal stress and process cold stress, make bearing race be gradually brought to design it is several
What shape.The deformation of bearing race is mostly the radial deformation that axial deformation and axial deformation are caused, when axial deformation restores
When, the radial deformation caused generally can also restore.
Specifically, it is positioned to one end of orthopedic bearing race by the positioning region of fixed setting, i.e. end provided by portions
The other end of positioning region, bearing race is compressed by axial pressing device, and generated pressure is axial force, can guide bearing race
It creeps, makes the both ends depth of parallelism of bearing race in accordance with design accuracy.Heating element is for eliminating stress, thus the two of fitted bearing circle
End compresses, and completes the orthopedic of bearing race.
Detailed description of the invention
Fig. 1 is the orthopedic status architecture schematic diagram of the hot orthopedic appliance of housing washer in an embodiment.
Fig. 2 is heated seats structural schematic diagram in an embodiment.
Fig. 3 is the orthopedic status architecture schematic diagram of the hot orthopedic appliance of rolling bearing inner ring in an embodiment.
In figure: 1. heating mantles, 2. heated seats, 3. setting sets, 4. orthopedic rings, 5. bearing outer rings, 6. piston rods, 7. cylinder bodies,
8. oil pocket, 9. cylinder caps, 10. calandrias, 11. oilholes, 12. oilholes, 13. bottom plates, 14. cover for seat, 15. bottom outlets, 16. inner holes, 17. spiral shells
Spin slot, 18. bearing inner races.
Specific embodiment
For rolling bearing, bearing inner race 18 and bearing outer ring 5 are all typical external members, and have determining axis
Line is referred on the basis of the axial direction of bearing race in an embodiment of the present invention.
It is the fixing piece during heat is orthopedic accordingly for heated seats 2 as illustrated in fig. 1 and 2, more preferably as positioning datum,
Therefore, on the basis of the axial direction of heated seats 2, and reference above-mentioned in the ideal situation with the axial direction of heated seats 2 complete one
It causes.
Based on aforementioned basic, first end and second end is determined, be specifically formed by with heating mantle 1 and heated seats 2
Based on assembly, i.e., portions, axial seat end are first end, seat end as shown in Figure 1, where axial pressing device
One end is second end, i.e. right end shown in Fig. 1.
About running parameter, based on heating temperature, the temperature of bearing race is set to reach 335 DEG C ± 15 DEG C, temperature control
Required precision is not high.
About bearing race, as previously mentioned, including bearing inner race 18 and bearing outer ring 5, wherein the inner surface of bearing inner race 18
For cylinder, the outer surface of bearing outer ring 5 is cylinder, is suitable for positioning；Another surface of bearing inner race 18 and bearing outer ring 5 at
Type goes out raceway, is unsuitable for positioning.
In the structure shown in Fig. 1 and 2, the assembly that heating mantle 1 and heated seats 2 and calandria 10 are constituted is denoted as seat
Portion, the body portion of portions on the whole are its left end portion, and bottom plate 13 as shown in Figure 2, set portion is then funtion part, accordingly
Ground, bottom plate 13 are located at the one end in set portion, which is the left end in Fig. 2, i.e. the first end that defines of foregoing teachings.
The right end in set portion is defined as second end in Fig. 1.
Set portion is built-in with heating element, and the radial direction in set portion is close on the basis of the position where heating element to orthopedic
Bearing race side be heat good conductor, away from one end of bearing race be heat isolating bar body.
Fig. 1 and Fig. 3 shows hot by the rolling bearing circle being adapted to when bearing outer ring 5 and bearing inner race 18 for bearing race
The structure of orthopedic appliance, this kind of structure have no effect on the essential structure that claim 1 is addressed, also without prejudice to foregoing teachings institute
The essential structure addressed.
The hot orthopedic appliance of rolling bearing circle as shown in figures 1 and 3 still further comprises setting set other than portions
3。
About setting set 3, it is necessary first to explanation, it is this to orthopedic bearing race although heat distortion can be generated
Deformation is not actually fairly obvious in macroscopic aspect, and in other words, deflection is practical simultaneously little, or even if do not examined,
It can't see at all, need just detect by instrument and meter when more.
Generally speaking, to orthopedic bearing race despite the presence of overproof in such as circularity, but it is orthopedic to be not enough to influence heat
The positioning of relative loose.
It can be in the way of clearance fit when a certain bearing of matching is designed accordingly, with respect to setting set 3
It is designed, the internal diameter of setting set 3 is determined according to twice ~ three times of the upper limit of clearance fit.I.e. to orthopedic bearing race
To the upper limit of the tolerance range of (such as IT7 class precision) under+3 times of diameter of corresponding precision of the cylinder of 3 cooperation of setting set as fixed
Shape covers the diameter of 3 cylinders used for positioning.
Setting set 3 shown in Fig. 1 and Fig. 3 is the external member for having flange on the whole, and flange is for it in portions axis
To positioning, it is to be understood that axially position belongs to the foundation location structure of machinery field, such as can also be fixed using the shaft shoulder
Position, the positioning of type face etc..
One end that setting set 3 is used as positioning obviously corresponds to the second end in set portion, correspondingly, based on setting set 3
Location structure, setting set 3 are axially positioned on the second end in set portion.As an external member, the second end of setting set 3 is positioning end,
First end to the part between second end is also sheath structure, and cylinder, i.e. inner cylinder and outer cylinder there are two having.
Reference book attached drawing 1 adapts to bearing outer ring 5, between the inner cylinder of setting set 3 and the outer cylinder of bearing outer ring 5
Shaft hole matching is formed, constitutes shaft hole matching between the outer cylinder of setting set 3 and the inner cylinder of cover for seat 14.
And for example shown in Figure of description 3, adapt to bearing inner race 18, the inner cylinder and cover for seat 14 of setting set 3
Outer cylinder formed shaft hole matching, and shape set 3 outer cylinder and bearing inner race 18 inner cylinder cooperate.
By above structure, to orthopedic bearing race in addition to a freedom of movement is outside one's consideration, bearing race is substantially constrained.Into
And the hot orthopedic appliance of rolling bearing circle further includes axial pressing device, which provides the pressure section of set portion axial direction,
After being positioned at end positioning region with the first end in the bearing race, it is pressed on the second end of the bearing race.
About above content, related is the main part of the hot orthopedic appliance of rolling bearing circle, and for for example heating
Body 10, the driving circuit those skilled in the art configured are assured that without involving an inventive effort.Such as it is simple
Given power driving circuit, be not necessarily to intelligent control part, in the case where environment temperature is not much different, receptor temperature is substantially
It can be in the range of setting.
It further include one orthopedic in Fig. 1 and structure shown in Fig. 3 to improve hot lucky device to the suitability of workpiece
Ring 4, the orthopedic ring 4 is between end positioning region and the first end of setting set 3, in other words, realizes the tool of bearing race first end positioning
Body component is orthopedic ring 4, can replace different orthopedic rings 4 according to workpiece difference, have preferably suitability.
It further, is the reliability for improving positioning, there are gaps between setting set 3 and end positioning region, will not generate positioning
Interference.
In addition, the axial length of orthopedic ring 4 is greater than the width in gap, and between orthopedic ring 4 and another cylinder of setting set 3
Shaft hole matching is formed, to guarantee that orthopedic ring 4 in the case where individual is smaller, can keep higher concentricity with bearing race.
In Fig. 1 and Fig. 3, the thickness of orthopedic ring 3 is greater than the wall thickness of the bearing race, to keep higher rigidity, is conducive to axis
Hold the orthopedic of circle.
In Fig. 1 and structure shown in Fig. 3, setting set 3 is included
Body, for cooperating with portions and bearing race；
Flange, positioned at the second end of body, with body one, the first end end face of the flange is supported on the second end end face in set portion
And form positioning.
Fig. 1 and setting shown in Fig. 33 structures of set are simple, and positioning accuracy is high.
In addition, in Fig. 1, flange is outward flange, and in Fig. 3, flange is inward flange.
In Fig. 2, the end positioning region of the portions is a ring structure body, i.e. the bottom plate 13 of bottom outlet 15 is provided in Fig. 2, whole
In the case that body weight is relatively small, overall weight is smaller.
Correspondingly, the first end in set portion is fixedly connected or constructs with the second end end face of ring structure body and is integrated；
Set portion and ring structure body coaxial line；
The outer diameter in set portion is less than the outer diameter of ring structure body, and the internal diameter in set portion is greater than the internal diameter of ring structure body, from Fig. 1 and Fig. 3
Shown in the structure as can be seen that part vacated relative to cover for seat 14 of bottom plate 15 for heating mantle 1, setting set 3 and bearing race
Assembly, assembly compactedness it is good.
About set portion, can be non-disconnectable structure, heating element is built in set portion, such as by molding, directly will plus
Thermal element is built in set portion, reserves lead.
In some embodiments, set portion uses assembling structural body, and set portion is nested structure body, and forms inner-outer sleeve, nested
Assembling structure is relatively easy, and connection structure is also relatively easy, such as can be assembled in 13 side of bottom plate using screw.
Correspondingly, heating element is arranged on the interface of inner-outer sleeve, after having removed housing, so that it may assembly or replacement
Heating element.
Further, helicla flute is provided on the interface of inner-outer sleeve；
Heating element is the heating wire laid along helicla flute.
Preferably, the axial pressing device is the axial hydraulic cylinder for being laid in the second end side of portions, the piston of hydraulic cylinder
Bar 6 acts on the bearing race and constitutes the pressure section.
Pressure provided by hydraulic cylinder is unrelated with the extension elongation of piston rod 6, and only with the pressure of hydraulic oil and piston rod 6
Cross-sectional area (plunger-type) or related to the bearing area of piston, therefore, when orthopedic, the change of 6 extension elongation of piston rod
It is dynamic, it still can keep identical operating pressure.
Further, as shown in figs. 1 and 3, the cylinder body 7 of hydraulic cylinder is a barrel shape part, and bucket wall molds multiple oil pockets 8, from
And multiple sub- hydraulic cylinders can be constructed, adapt to the end face structure of bearing race.
Further, oil pocket 8 is using 7 axis of cylinder body as the array element of the annular array of axis.
Correspondingly, a piston rod 6 is configured with for each oil pocket 8.
For oil pocket 8 structure configuration, processed from the right end of the cylinder body 6 of such as Fig. 1, then ligand cylinder cap 9 into
Row closing, and piston rod 6 is also assembled from 9 place end of cylinder cap.
Cylinder cap 9 is furnished with sealing ring, to guarantee higher sealability.
Cylinder cap 9 between screw and cylinder body 7 by assembling.
The oilhole of oil pocket 8 is opened in the outside wall surface of barrel wall.
Claims (10)
1. a kind of hot orthopedic appliance of rolling bearing circle characterized by comprising
Portions, which has set portion and is formed in the end positioning region of set portion one end, and set portion is built-in with heating element, in set portion
Axial direction, remember end positioning region where one end be first end, one end opposite with first end be second end；
Setting set, the setting set are axially positioned on the second end in set portion, and extend to first end, and a cylinder of the set that shapes with
Set portion forms shaft hole matching, another cylinder forms shaft hole matching with to orthopedic bearing race；And
Axial pressing device, the axial direction pressing device provide the pressure section of set portion axial direction, with fixed in the first end of the bearing race
Behind the positioning region of end, it is pressed on the second end of the bearing race.
2. the hot orthopedic appliance of rolling bearing circle according to claim 1, which is characterized in that it further include an orthopedic ring, it should
Orthopedic ring is between end positioning region and the first end of setting set.
3. the hot orthopedic appliance of rolling bearing circle according to claim 2, which is characterized in that stayed between setting set and end positioning region
There is gap；
The axial length of orthopedic ring is greater than the width in gap, and forms axis hole between orthopedic ring and another cylinder of setting set and match
It closes.
4. the hot orthopedic appliance of rolling bearing circle according to claim 2 or 3, which is characterized in that the thickness of orthopedic ring is greater than
The wall thickness of the bearing race.
5. the hot orthopedic appliance of rolling bearing circle according to claim 1, which is characterized in that setting set includes
Body, for cooperating with portions and bearing race；
Flange, positioned at the second end of body, with body one, the first end end face of the flange is supported on the second end end face in set portion
And form positioning.
6. the hot orthopedic appliance of rolling bearing circle according to claim 1, which is characterized in that the end positioning region of the portions is
One ring structure body；
Correspondingly, the first end in set portion is fixedly connected or constructs with the second end end face of ring structure body and is integrated；
Set portion and ring structure body coaxial line；
The outer diameter in set portion is less than the outer diameter of ring structure body, and the internal diameter in set portion is greater than the internal diameter of ring structure body.
7. the hot orthopedic appliance of rolling bearing circle according to claim 1, which is characterized in that set portion is nested structure body, and
Form inner-outer sleeve；
Heating element is arranged on the interface of inner-outer sleeve.
8. the hot orthopedic appliance of rolling bearing circle according to claim 7, which is characterized in that be provided with spiral shell on the interface of inner-outer sleeve
Spin slot；
Heating element is the heating wire laid along helicla flute.
9. the hot orthopedic appliance of rolling bearing circle according to claim 1, which is characterized in that the axial direction pressing device is axis
To the hydraulic cylinder for being laid in the second end side of portions, the piston rod of hydraulic cylinder acts on the bearing race and constitutes the pressure section.
10. the hot orthopedic appliance of rolling bearing circle according to claim 9, which is characterized in that the cylinder body of hydraulic cylinder is one barrel
Type part, bucket wall mold multiple oil pockets；
Oil pocket is using cylinder body axis as the array element of the annular array of axis；
Correspondingly, a piston rod is configured with for each oil pocket；
The oilhole of oil pocket is opened in the outside wall surface of barrel wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811630485.7A CN109351815B (en) | 2018-12-29 | 2018-12-29 | Rolling bearing ring thermal correction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811630485.7A CN109351815B (en) | 2018-12-29 | 2018-12-29 | Rolling bearing ring thermal correction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109351815A true CN109351815A (en) | 2019-02-19 |
| CN109351815B CN109351815B (en) | 2023-08-18 |
Family
ID=65329513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811630485.7A Active CN109351815B (en) | 2018-12-29 | 2018-12-29 | Rolling bearing ring thermal correction device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109351815B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002257145A (en) * | 2000-12-28 | 2002-09-11 | Ntn Corp | Manufacturing method for rolling bearing and bearing ring of rolling bearing |
| CN201645111U (en) * | 2010-02-09 | 2010-11-24 | 淄博德诺铝业科技有限公司 | Electric heater assembled and unassembled on bearing inner ring |
| JP2016016443A (en) * | 2014-07-10 | 2016-02-01 | Ntn株式会社 | Bearing ring manufacturing method, and bearing ring |
| CN106048194A (en) * | 2016-08-15 | 2016-10-26 | 浙江新昌皮尔机械配件有限公司 | Heat treatment mechanism convenient for shaping, for bearing ring |
| CN108620452A (en) * | 2017-03-22 | 2018-10-09 | 沈阳铸造研究所 | A kind of hot straightening method of titanium alloy abnormal shape tubular casting |
-
2018
- 2018-12-29 CN CN201811630485.7A patent/CN109351815B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002257145A (en) * | 2000-12-28 | 2002-09-11 | Ntn Corp | Manufacturing method for rolling bearing and bearing ring of rolling bearing |
| CN201645111U (en) * | 2010-02-09 | 2010-11-24 | 淄博德诺铝业科技有限公司 | Electric heater assembled and unassembled on bearing inner ring |
| JP2016016443A (en) * | 2014-07-10 | 2016-02-01 | Ntn株式会社 | Bearing ring manufacturing method, and bearing ring |
| CN106048194A (en) * | 2016-08-15 | 2016-10-26 | 浙江新昌皮尔机械配件有限公司 | Heat treatment mechanism convenient for shaping, for bearing ring |
| CN108620452A (en) * | 2017-03-22 | 2018-10-09 | 沈阳铸造研究所 | A kind of hot straightening method of titanium alloy abnormal shape tubular casting |
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| Publication number | Publication date |
|---|---|
| CN109351815B (en) | 2023-08-18 |
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