CN110093494A - A kind of laser shock peening method and its device of bearing inner race - Google Patents
A kind of laser shock peening method and its device of bearing inner race Download PDFInfo
- Publication number
- CN110093494A CN110093494A CN201910359669.2A CN201910359669A CN110093494A CN 110093494 A CN110093494 A CN 110093494A CN 201910359669 A CN201910359669 A CN 201910359669A CN 110093494 A CN110093494 A CN 110093494A
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- China
- Prior art keywords
- bearing inner
- inner race
- laser
- pedestal
- raceway
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
Abstract
The present invention is the laser shock peening method and its device of a kind of bearing inner race; bearing inner race is fixed and is suspended by laser impact intensified device by the present invention; the pedestal of the device is connected by screw to robot ring flange; pedestal is inserted into the central channel of robot ring flange, it is ensured that pedestal and ring flange have good concentricity；Pin is inserted into susceptor through-holes, in small clearance fit, it is ensured that pin and ring flange have good concentricity；Pin is inserted into interior ring support centre bore, also ensures that interior ring support and ring flange have good concentricity；Bearing inner race is inserted into interior ring support, is fixed by cover board and screw.Whole device ensures that bearing inner race and robot ring flange have good concentricity, the design will guarantee during laser scanning, bearing inner race raceway is by uniform scanning, so that it is guaranteed that the surface residual stress of bearing inner race raceway is evenly distributed, dimension overproof caused by preventing because of residual stress unevenness reduces the removal amount of subsequent grinding correction of the flank shape.
Description
Technical field
The present invention is the laser shock peening method and its device of a kind of bearing inner race, belongs to piece surface processing technique neck
Domain.
Background technique
The Service Environment very severe of bearing, by the multifactor collective effect such as high stress, high speed, high temperature, because with ball
Relative motion occur abrasion, contact fatigue failure risk it is higher.Laser impact intensified is a kind of raising metal material surface
The effective ways of hardness and fatigue behaviour, the plasma shock wave generated using high-energy short-pulse induced with laser is in material table
Face makes material surface that elastic-plastic deformation occur, the hardened layer and residual compressive stress layer of certain depth is formed, to improve material table
A kind of wear-resisting processing method with fatigue behaviour in face.Due to significant effect, current laser impact intensified technique is by extensive both at home and abroad
Applied in the processing and manufacturing of key components and parts.
In order to improve the wear resistance, bearing inner race raceway face often needs one layer of wear-resistant coating of infiltration/deposition.It is prepared in coating
Before, need to be formed residual compressive stress layer and hardening of tissue layer that a layer depth layer is greater than 200 μm between coating and matrix, to mention
The binding force of high coating；Common method is the method using shot-peening or sandblasting at present, but generated due to shot-peening or sandblasting
Residual compressive stress layer depth and hardening of tissue layer are limited (≤200 μm), it is difficult to meet the requirement of preparation technology of coating；In addition, axis
Holding raceway is curved surface, and radius of curvature is smaller, in order to guarantee that the curvature of raceway after strengthening meets drawing requirement, is needed to rolling again
Carry out grinding repairing type, to get rid of the residual compressive stress layer and hardening of tissue layer of certain depth, if after strengthening raceway curvature
Variation is too big, and it is too many that it will cause removal amounts, and residual compressive stress layer and hardening of tissue layer residual are very little, and coating binding force can not expire
Foot requires.
Summary of the invention
The present invention is exactly directed to above-mentioned problems of the prior art and designs and provide a kind of laser of bearing inner race
Impact reinforcing method and its device, the purpose is to residual compressive stress layer (>=200 μ of certain depth are formed in bearing inner race raceway
M) and hardening of tissue layer (>=200 μm), raising coating binding force meet preparation technology of coating requirement.
The purpose of the present invention is achieved through the following technical solutions:
Technical solution of the present invention provides a kind of laser shock peening method of bearing inner race, it is characterised in that: this method
The step of it is as follows:
Step 1: using black belt as laser absorption layer, paste bearing inner race in raceway face, constrain water along
Raceway flows to form moisture film；
Step 2: the raceway of the light-emitting window alignment bearings inner ring 6 of laser impact intensified equipment sweeps raceway point by point
Realization surface peening is retouched, first the point-by-point middle line for strengthening curve surface of raceway, then the point-by-point two sides for strengthening middle line, until hot spot all covers
Entire raceway.
The technological parameter of laser reinforcing are as follows: laser power density be 1GW/cm2~20GW/cm2, overlapping rate be 30%~
75%, frequency is 1Hz~5Hz, and the normal angle in laser beam and region to be fortified is 0 °~45 °.
Technical solution of the present invention additionally provides a kind of device of laser shock peening method for the bearing inner race,
It is characterized by: the device includes a cylindric interior ring support 3 with the level, bearing inner race 5 to be processed is sleeved on inner ring
On the step surface of 3 right ends of seat, the central axis along interior ring support 3 is machined with through-hole, and pin 2 is led to by a pedestal 1 across this
Kong Houzai is set with cover board 4, and pedestal 1 is fixed on the end face of interior 3 left end of ring support by screw 5, cover board 4 is pressed in bearing
With the position of fixing bearing inner ring 6 on the end face of circle 6.Pedestal 1 is fixed on robot ring flange.
Further, the screw hole on the top of screw 5 and pin 2 cooperates to realize the fixation to pedestal 1 and cover board 4.
Further, be in clearance fit between 3 step surface of bearing inner race 5 and interior ring support, on pin 2 and pedestal 1 through-hole it
Between be in clearance fit.
Further, the outer diameter of bearing inner race 5 is concordant with interior 3 step surface of ring support.
Further, in the thickness L1+ of the length L2=pedestal 1 of the pin rod of pin 2 in the length L3+ of the large cylinder of ring support 3
The length L4-0.5mm of the small cylinder of ring support 3.
The working principle of the invention is: bearing inner race fixed and suspended by laser impact intensified device, the device
Pedestal is connected by screw to robot ring flange, and pedestal is inserted into the central channel of robot ring flange, it is ensured that pedestal and flange
Disk has good concentricity；Pin is inserted into susceptor through-holes, in small clearance fit, it is ensured that pin and ring flange have well
Concentricity；Pin is inserted into interior ring support centre bore, also ensures that interior ring support and ring flange have good concentricity；In bearing
Circle is inserted into interior ring support, is fixed by cover board and screw.It is good that whole device ensures that bearing inner race and robot ring flange have
Concentricity, which will guarantee that during laser scanning, bearing inner race raceway is by uniform scanning, so that it is guaranteed that in bearing
The surface residual stress of circle raceway is evenly distributed, dimension overproof caused by preventing because of residual stress unevenness, reduces subsequent grinding and repairs
The removal amount of shape.
In addition, for the application method of the device, it is " first point-by-point to strengthen rolling due to the symmetroid that raceway is spill
The middle line of road curved surface, then the point-by-point two sides for strengthening middle line, until hot spot all covers entire raceway " will be helpful to keep curved surface
Symmetry reduces removal amount when later period grinding correction of the flank shape；Use " laser power density 1GW/cm2~10GW/cm2, overlapping rate
Be 30%~75%, frequency is 1Hz~5Hz, and the normal angle in laser beam and region to be fortified is 0 °~45 ° " laser work
Skill parameter can make raceway face generate face value and the uniform residual compressive stress layer of depth value and hardening of tissue layer.Research
Show using the above method, after laser impact intensified+grinding correction of the flank shape, raceway face forms the residual pressure that depth is not less than 300 μm
Stressor layers and depth are not less than 220 μm of hardening of tissue layer.
The advantages of technical solution of the present invention be can bearing inner race raceway formed certain depth residual compressive stress layer (>=
200 μm) and hardening of tissue layer (>=200 μm), coating binding force is improved, preparation technology of coating requirement is met.Implementation of the invention
Example one, tests prove that, the residual compressive stress layer depth that bearing inner race raceway is formed is about 300 μm, and hardening of tissue layer depth is about
It is 220 μm, raceway critical size meets drawing requirement.
Detailed description of the invention
Fig. 1 is the base construction schematic diagram of the laser impact intensified device of the present invention.
Fig. 2 is the pin feature schematic diagram of the laser impact intensified device of the present invention.
Fig. 3 is the inner ring holder structure schematic diagram of the laser impact intensified device of the present invention.
The covering plate structure schematic diagram that Fig. 4 is.
Fig. 5 is the overall structure diagram of the laser impact intensified device of the present invention.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawings and examples.
Embodiment 1
Referring to shown in Fig. 1 to 5, the laser impact intensified device of this kind of bearing inner race includes pedestal 1, pin 2, interior ring support 3,
Cover board 4 and screw 5.Pedestal 1 is made of two coaxial big plectanes and small circular plate, and there are a through-hole, big plectane in the center of pedestal 1
The upper connecting hole for being evenly distributed with 6 diameter phi 10mm.Pin 2 is made of stem knob and pin rod, and there is a diameter M4mm in pin rod right side
Threaded hole.Interior ring support 3 is made of two coaxial large cylinders and small cylinder to form a step surface, and cover board 4 is band center
The plectane in hole, center-hole diameter 4mm.
The through-hole of the pin rod and pedestal 1 is in clearance fit；Large cylinder consistent with the center-hole diameter of small cylinder (is φ
14 ± 0.03mm mm), and (being 14 ± 0.03mm of φ) identical as the diameter phi D1 of the through-hole of pedestal 1, the outer diameter φ of large cylinder
D (being 25.37 ± 0.03mm of φ) consistent with the outer diameter of bearing inner race 6 to be fortified, the outer diameter φ d of small cylinder and to be fortified
The internal diameter of bearing inner race 6 is in clearance fit (being 25.37 ± 0.05mm of φ)；The outer diameter φ D6 of cover board 4 and the outer diameter of small cylinder
φ d identical (being 25.37 ± 0.05mm of φ)；The length L3+ roundlet of the thickness L1+ large cylinder of the length L2=pedestal 1 of pin rod
The length L4-0.5mm of cylinder.The thickness L1 of pedestal 1 is 10mm ± 0.05mm, and the length L3 of large cylinder 301 is 10mm ± 0.05mm,
The length L4 of small cylinder 302 is 10mm ± 0.05mm, and therefore, the length L2 of the pin rod of pin rod is 29.5 ± 0.05mm.
The step of method strengthened using above-mentioned apparatus to bearing inner race 6, is as follows:
1, bearing inner race clamping:
1.1, the small cylinder of interior ring support 3 is inserted into bearing inner race 6 to be fortified；Pin 2 is successively inserted into base from left to right
Through-hole, the centre bore of the large cylinder of interior ring support (3) and the centre bore of small cylinder of seat 1；Screw 5 is inserted into the centre bore of cover board 4,
And it is inserted into the threaded hole of pin 2 and tightens；By pedestal 1 by being fixed on robot ring flange.
2, laser impact intensified:
2.1, raceway face is pasted onto as laser absorption layer using black belt, it is ensured that bubble-free in black belt, about
Shu Shui flows to form moisture film along raceway.
2.2, by the raceway of light-emitting window alignment bearings inner ring 6, laser impact intensified equipment is opened, raceway is swept point by point
Realization surface peening is retouched, first the point-by-point middle line for strengthening curve surface of raceway, then the point-by-point two sides for strengthening middle line, until hot spot all covers
Entire raceway, wherein laser power density 1GW/cm2, overlapping rate 30%, frequency 1Hz, laser beam and area to be fortified
The normal angle in domain is 0 °.
2.3, after to laser scanning, laser impact intensified equipment is closed, unscrews screw 5, removes bearing inner race.
Embodiment two
Detailed process is roughly the same with embodiment one, and difference is that the laser power density in step 2.2 is 10GW/
cm2, overlapping rate 75%, frequency 5Hz, the normal angle in laser beam and region to be fortified is 45 °.
Claims (8)
1. a kind of laser shock peening method of bearing inner race, it is characterised in that: the step of this method is as follows:
Step 1: using black belt as laser absorption layer, paste bearing inner race in raceway face, constrain water along raceway
Flowing forms moisture film；
Step 2: the raceway of the light-emitting window alignment bearings inner ring (6) of laser impact intensified equipment is carried out point by point scanning to raceway
Surface peening is realized, first the point-by-point middle line for strengthening curve surface of raceway, then the point-by-point two sides for strengthening middle line, until all covering is whole for hot spot
A raceway.
2. the laser shock peening method of bearing inner race according to claim 1, it is characterised in that: the technique of laser reinforcing
Parameter are as follows: laser power density 1GW/cm2~20GW/cm2, overlapping rate is 30%~75%, and frequency is 1Hz~5Hz, laser
Light beam and the normal angle in region to be fortified are 0 °~45 °.
3. a kind of device of the laser shock peening method for bearing inner race described in claim 1, it is characterised in that: the dress
It sets including a cylindric interior ring support (3) with the level, bearing inner race (5) to be processed is sleeved on interior ring support (3) right end
On step surface, the central axis along interior ring support (3) is machined with through-hole, after pin (2) are passed through the through-hole by a pedestal (1)
It is set with cover board (4) again, pedestal (1) is fixed on the end face of interior ring support (3) left end by screw (5), cover board (4) is pressed on
With the position of fixing bearing inner ring (6) on the end face of bearing inner race (6).
4. the laser shock peening method of bearing inner race according to claim 3, it is characterised in that: pedestal (1) is fixed on
On robot ring flange.
5. the laser shock peening method of bearing inner race according to claim 3, it is characterised in that: screw (5) and pin
(2) screw hole on top cooperates to realize the fixation to pedestal (1) and cover board (4).
6. the laser shock peening method of bearing inner race according to claim 3, it is characterised in that: bearing inner race (5) with
It is in clearance fit between interior ring support (3) step surface, is in clearance fit between through-hole on pin (2) and pedestal (1).
7. the laser shock peening method of bearing inner race according to claim 3, it is characterised in that: bearing inner race (5)
Outer diameter is concordant with interior ring support (3) step surface.
8. the laser shock peening method of bearing inner race according to claim 3, it is characterised in that: the pin rod of pin (2)
Length L2=pedestal (1) thickness L1+ in ring support (3) large cylinder length L3+ in ring support (3) small cylinder length
L4-0.5mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910359669.2A CN110093494A (en) | 2019-04-29 | 2019-04-29 | A kind of laser shock peening method and its device of bearing inner race |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910359669.2A CN110093494A (en) | 2019-04-29 | 2019-04-29 | A kind of laser shock peening method and its device of bearing inner race |
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| Publication Number | Publication Date |
|---|---|
| CN110093494A true CN110093494A (en) | 2019-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910359669.2A Pending CN110093494A (en) | 2019-04-29 | 2019-04-29 | A kind of laser shock peening method and its device of bearing inner race |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959244A (en) * | 2022-06-22 | 2022-08-30 | 沈阳工业大学 | Laser shock peening method for improving surface compressive stress layer depth and fatigue performance of 8Cr4Mo4V bearing steel |
| CN114959248A (en) * | 2022-06-22 | 2022-08-30 | 沈阳工业大学 | Method for laser shock peening of bearing ring raceway surface |
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| US20050229396A1 (en) * | 2002-10-03 | 2005-10-20 | Federal Mogul World Wide, Inc. | Method of forming engine bearing |
| CN102492805A (en) * | 2011-12-16 | 2012-06-13 | 江苏大学 | Method and device for processing metal materials with cryogenic laser shock |
| CN103898313A (en) * | 2014-04-10 | 2014-07-02 | 西安航空动力股份有限公司 | Laser impact reinforcing method of turbine disc tongue-and-groove structure |
| CN108559835A (en) * | 2018-03-22 | 2018-09-21 | 江苏大学 | A kind of device and method of laser processing ball bearing outer rollaway nest |
| CN109371223A (en) * | 2019-01-02 | 2019-02-22 | 济南大学 | Rolling bearing circle laser reinforcing device |
-
2019
- 2019-04-29 CN CN201910359669.2A patent/CN110093494A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050229396A1 (en) * | 2002-10-03 | 2005-10-20 | Federal Mogul World Wide, Inc. | Method of forming engine bearing |
| CN102492805A (en) * | 2011-12-16 | 2012-06-13 | 江苏大学 | Method and device for processing metal materials with cryogenic laser shock |
| CN103898313A (en) * | 2014-04-10 | 2014-07-02 | 西安航空动力股份有限公司 | Laser impact reinforcing method of turbine disc tongue-and-groove structure |
| CN108559835A (en) * | 2018-03-22 | 2018-09-21 | 江苏大学 | A kind of device and method of laser processing ball bearing outer rollaway nest |
| CN109371223A (en) * | 2019-01-02 | 2019-02-22 | 济南大学 | Rolling bearing circle laser reinforcing device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959244A (en) * | 2022-06-22 | 2022-08-30 | 沈阳工业大学 | Laser shock peening method for improving surface compressive stress layer depth and fatigue performance of 8Cr4Mo4V bearing steel |
| CN114959248A (en) * | 2022-06-22 | 2022-08-30 | 沈阳工业大学 | Method for laser shock peening of bearing ring raceway surface |
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Application publication date: 20190806 |