CN111085943A - Device applied to bearing ring working surface and shot peening strengthening method thereof - Google Patents

Device applied to bearing ring working surface and shot peening strengthening method thereof Download PDF

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Publication number
CN111085943A
CN111085943A CN201911351362.4A CN201911351362A CN111085943A CN 111085943 A CN111085943 A CN 111085943A CN 201911351362 A CN201911351362 A CN 201911351362A CN 111085943 A CN111085943 A CN 111085943A
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Prior art keywords
raceway
bearing
shot peening
shot
ring
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CN201911351362.4A
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CN111085943B (en
Inventor
李岩
薛雪
张绍群
关云朋
胡北
段继明
韩东宇
张振明
王强
刘泓铄
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AVIC Harbin Bearing Co Ltd
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AVIC Harbin Bearing Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2223/00—Surface treatments; Hardening; Coating
    • F16C2223/02—Mechanical treatment, e.g. finishing
    • F16C2223/08—Mechanical treatment, e.g. finishing shot-peening, blasting

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The invention relates to a shot peening tool and aims to perform shot peening on a bearing working surface, reasonably arrange a shot peening process flow, design the shot peening tool, optimally select shot peening parameters, improve the pressure stress of the working surface and the sub-surface of the bearing ring, enable the pressure stress of the bearing surface to be more than 700MPa, and effectively strengthen the depth of a layer to be more than 0.15mm, further improve the fatigue resistance of the working surface of the bearing ring and achieve the aim of prolonging the service life of a bearing. The invention is applied to the field of bearings.

Description

Device applied to bearing ring working surface and shot peening strengthening method thereof
Technical Field
The invention relates to a shot peening tool, in particular to a device applied to the working surface of a bearing ring and a shot peening method thereof.
Background
As one of the core components of the aircraft engine, the rotor system bearing of the aircraft engine needs to work under extremely severe working conditions such as high speed, high temperature, heavy load and large working condition fluctuation, and also needs to meet extremely severe performance index requirements such as long service life, high precision, high stability, high reliability, oil cut resistance and abrasion resistance. The main shaft bearing of the aeroengine in China has the problems of insufficient fatigue life, frequent high-temperature and high-speed state faults and the like, the performance and reliability of the whole aeroengine are severely restricted and influenced, the working performance and the service life of the bearing depend on the fatigue resistance of the working surface of a bearing ring, and the key factor influencing the fatigue resistance of the raceway is the magnitude and the distribution state of the pressure stress on the surface and the sub-surface of the raceway. At present, the surface stress and the sub-surface stress of a raceway of a bearing ring are mainly generated by the grinding force of a grinding wheel, the grinding processing mode enables the surface compressive stress value generated by the raceway to be lower, the effective depth of the sub-surface compressive stress layer to be shallower, and the fatigue resistance of the raceway is relatively poorer.
Moreover, the bearing raceway can generate large plastic deformation after shot peening strengthening, which causes the ellipticity to increase, and after the ellipticity is improved by subsequent processing, the allowance removed in the circumferential direction of the raceway is not uniform, which can cause the pressure stress value on the circumferential surface of the raceway to have large difference, namely the surface stress state is not uniformly distributed, and the surface state is not beneficial to improving the fatigue resistance of the raceway.
Disclosure of Invention
The invention aims to solve the problems of low compressive stress and low fatigue resistance of the working surface and the sub-surface of the bearing ring machined at present, and provides a device applied to the working surface of the bearing ring and a shot peening strengthening method thereof.
The invention relates to a shot peening strengthening device applied to the working surface of a bearing ring, which consists of a shot peening strengthening tool for a bearing outer ring and a shot peening strengthening tool for a bearing inner ring;
the shot blasting strengthening tool for the outer ring of the bearing comprises a rotary table, a lower die holder, an upper pressing plate and a lower protection plate;
the lower die base is of an inverted frustum structure with an upper opening and a hollow interior; the side wall of the upper part of the lower die holder is folded inwards, and a boss is formed in the lower die holder;
the lower die base is connected with the turntable through a nut;
the upper pressure plate is of a circular ring structure, and the outer edge of the inner ring is bent downwards; the lower protective plate is in a circular ring structure, and the outer edge of the inner ring is bent upwards; the lower protection plate is arranged on the boss, and the outer ring of the bearing is arranged on the lower protection plate; the upper pressure plate is respectively arranged on the bearing outer ring and the upper surface of the turntable and is connected with the turntable through a countersunk bolt; the bearing outer ring is tightly matched with the lower protection plate, the upper pressing plate and the inner wall of the lower die holder;
the raceway or the channel of the bearing outer ring faces the interior of the lower die holder;
the shot blasting strengthening tool for the bearing inner ring comprises an upper rotary table I, a lower die base II, an upper pressure plate I and a countersunk head bolt I;
the lower die base II is of a cylindrical structure with an upper opening and a hollow interior, and the bottom of the lower die base II extends outwards to form an outer edge;
the lower die base II is connected with the rotary table I through a nut; the bearing inner ring is arranged on an outer edge formed by the outward extension of the bottom of the lower die base II; the upper pressing plate I is of an original disc-shaped structure; the first upper pressure plate is arranged on the first rotary table and is in contact with the upper surface of the inner ring of the bearing, and the first countersunk head bolt sequentially penetrates through a threaded hole in the center of the first upper pressure plate and a threaded hole in the center of the first rotary table to connect the first upper pressure plate and the first rotary table together; and the bearing inner ring processing workpiece is tightly matched with the upper pressure plate I and the turntable I.
The invention relates to a method for shot peening the working surface of a bearing ring by using a device, which comprises the following steps:
firstly, shot peening strengthening of a bearing outer ring:
1) mounting the bearing outer ring on a shot blasting strengthening device of the bearing outer ring; then placing the muzzle of the spray gun in the shot peening strengthening tool of the outer ring of the bearing, and aligning the muzzle of the spray gun with the outer ring of the bearing;
2) the rotating disc is rotated at a constant speed and is arranged on the shot blasting machine, and the shot blasting machine drives the spray gun to move up and down at a constant speed to perform shot blasting reinforcement; the shot peening parameters are set as follows:
the shot blasting pressure of the channel and the raceway is 0.45-0.55 MPa, the shot blasting flow of the channel and the raceway is 6Kg/min, the rotating speed of a turntable of the channel and the raceway is 15rmp, the moving speed of a spray gun of the channel and the raceway is 50mm/min, the distance between a nozzle of the channel and a nozzle of the raceway and the surface of a workpiece is 80-120 mm, the blasting reciprocating moving distance of the channel and the raceway is the width of the raceway plus 20cm, and the shot blasting angle of the raceway is 90 degrees;
the shot blasting time of the channel and the raceway is determined according to the following formula,
t is 6.7 multiplied by the surface area cm of the raceway2X (raceway width +20 cm)/raceway width
Secondly, shot peening strengthening of the bearing inner ring:
3) mounting the bearing inner ring on a shot blasting strengthening device of the bearing inner ring; aligning the muzzle of the spray gun to the inner ring of the bearing;
4) rotating the turntable at a constant speed, and enabling the spray gun to move up and down at a constant speed to perform shot peening strengthening; the shot peening parameters are set as follows:
the shot blasting pressure of the channel and the raceway is 0.45-0.55 MPa, the shot blasting flow of the channel and the raceway is 6Kg/min, the rotating speed of a turntable of the channel and the raceway is 15rmp, the moving speed of a spray gun of the channel and the raceway is 50mm/min, the distance between a nozzle of the channel and a nozzle of the raceway and the surface of a workpiece is 80-120 mm, the blasting reciprocating moving distance of the channel and the raceway is the width of the raceway plus 20cm, and the shot blasting angle of the raceway is 90 degrees; the peening time of the channel and the raceway is determined according to the formula,
t is 6.7 multiplied by the surface area cm of the raceway2X (raceway width +20 cm)/raceway width
And (4) shot peening strengthening the outer ring and the inner ring of the bearing, namely, the shot peening strengthening of the working surface of the bearing ring is completed.
The invention has the following beneficial effects:
the invention carries out shot peening strengthening on the working surface of the bearing, reasonably arranges shot peening strengthening process flow, designs a shot peening strengthening tool, optimally selects shot peening strengthening parameters, improves the pressure stress of the working surface and the sub-surface of the bearing ring, strengthens the working surface of the bearing ring, can control the pressure stress value of the surface of the bearing raceway to be more than 800MPa, controls the depth of an effective strengthening layer to be more than 0.15mm, controls the pressure stress value of the sub-surface at 0.1mm to be more than 450MPa, and ensures that the stress distribution of the strengthened raceway surface is uniform, thereby improving the fatigue resistance of the working surface of the bearing ring and achieving the purpose of prolonging the service life of the.
In the shot blasting process, the shot repeatedly strikes the surface of the material, and finally the depth of a plastic deformation layer, namely the depth of a strengthening layer, is formed near the surface of the material, wherein the depth of the plastic deformation layer is 0.1-0.8 mm. The introduction of the surface plastic deformation layer is reasonably utilized, and the fatigue and stress corrosion resistance of the material can be improved.
Drawings
FIG. 1 is a view of the structure of the outer ring and the inner ring of the bearing;
FIG. 2 is a schematic structural view of a shot peening tool for an outer ring of a bearing;
FIG. 3 is a schematic structural view of a shot peening strengthening tool for an inner ring of a bearing;
FIG. 4 is a schematic view of the working form of the shot-blasting machine; wherein 8 is a spray gun;
FIG. 5 is a graph showing the distribution of the surface stress σ of the part.
Detailed Description
The first embodiment is as follows: the shot peening device applied to the working surface of the bearing ring comprises a shot peening tool for the outer ring of the bearing and a shot peening tool for the inner ring of the bearing;
the shot peening strengthening tool for the outer ring of the bearing comprises a rotary table 1, a lower die holder 2, an upper pressing plate 3 and a lower protection plate 4;
the lower die holder 2 is of an inverted frustum structure with an upper opening and a hollow interior; the upper side wall of the lower die holder 2 is folded inwards, and a boss 5 is formed in the lower die holder 2;
the lower die holder 2 is connected with the turntable 1 through a nut;
the upper pressure plate 3 is of a circular ring structure, and the outer edge of the inner ring is bent downwards; the lower protection plate 4 is of a circular ring structure, and the outer edge of the inner ring is bent upwards; the lower protection plate 4 is arranged on the boss 5, and the bearing outer ring 6 is arranged on the lower protection plate 4; the upper pressing plate 3 is respectively arranged on the bearing outer ring 6 and the upper surface of the turntable 1, and the upper pressing plate 3 is connected with the turntable 1 through a countersunk head bolt 7; the bearing outer ring 6 is tightly matched with the lower protection plate 4, the upper pressing plate 3 and the inner wall of the lower die holder 2;
the raceway or the channel of the bearing outer ring 6 faces the interior of the lower die holder 2;
the shot blasting strengthening tool for the bearing inner ring comprises a first upper rotary table 11, a second lower die base 12, a first upper pressure plate 13 and a first countersunk head bolt 17;
the lower die holder II 12 is of a cylindrical structure with an upper opening and a hollow interior, and the bottom of the lower die holder II 12 extends outwards to form an outer edge;
the lower die base II 12 is connected with the rotary table I11 through a nut; the bearing inner ring 16 is arranged on the outer edge formed by the outward extension of the bottom of the lower die holder II 12; the upper pressing plate I13 is of an original disc-shaped structure; the upper pressure plate I13 is arranged on the rotary table I11 and is in contact with the upper surface of the bearing inner ring 16, and the countersunk head bolt I17 sequentially penetrates through a threaded hole in the center of the upper pressure plate I13 and a threaded hole in the center of the rotary table I11 to connect the upper pressure plate I13 and the rotary table I11 together; and the bearing inner ring machining workpiece 16 is tightly matched with the upper pressure plate I13 and the rotating disc I11.
The second embodiment is as follows: this embodiment is different from the specific embodiment in that: a central area of the bottom of the lower die holder 2 is provided with a plurality of threaded holes, and a central area of the upper part of the turntable 1 is provided with threaded holes; and respectively connecting the nut with the threaded hole of the lower die holder 2 and the threaded hole of the turntable 1 in a threaded manner, and connecting the lower die holder 2 and the turntable 1 together.
Other components and connection modes are the same as those of the first embodiment.
The third concrete implementation mode: this embodiment is different from the specific embodiment in that: a central area of the bottom of the lower die base II 12 is provided with a plurality of threaded holes, and a central area of the upper part of the rotary table I11 is provided with a threaded hole; and respectively connecting the nut with the threaded hole of the second lower die holder 12 and the threaded hole of the first rotary table 11 in a threaded manner, and connecting the second lower die holder 12 and the first rotary table 11 together.
Other components and connection modes are the same as those of the first embodiment.
The fourth concrete implementation mode: this embodiment is different from the specific embodiment in that: the width of the boss 5 is larger than that of the bearing outer ring 6.
Other components and connection modes are the same as those of the first embodiment.
The fifth concrete implementation mode: referring to the present embodiment, a shot peening method for a working surface of a bearing ring according to the present embodiment is described below, the shot peening method including the steps of:
firstly, shot peening strengthening of a bearing outer ring:
1) mounting the bearing outer ring 6 on a bearing outer ring shot blasting strengthening device; then, placing the muzzle of the spray gun in the shot peening strengthening tool of the outer ring of the bearing, and aligning the muzzle of the spray gun with the outer ring 6 of the bearing;
2) the rotating disc 1 is rotated at a constant speed and is arranged on a shot blasting machine, and the shot blasting machine drives a spray gun to move up and down at a constant speed to perform shot blasting reinforcement; the shot peening parameters are set as follows:
the shot blasting pressure of the channel and the raceway is 0.45-0.55 MPa, the shot blasting flow of the channel and the raceway is 6Kg/min, the rotating speed of a turntable of the channel and the raceway is 15rmp, the moving speed of a spray gun of the channel and the raceway is 50mm/min, the distance between a nozzle of the channel and a nozzle of the raceway and the surface of a workpiece is 80-120 mm, the blasting reciprocating moving distance of the channel and the raceway is the width of the raceway plus 20cm, and the shot blasting angle of the raceway is 90 degrees;
the shot blasting time of the channel and the raceway is determined according to the following formula,
t＝6.7 times raceway surface area cm2X (raceway width +20 cm)/raceway width
Secondly, shot peening strengthening of the bearing inner ring:
3) mounting the bearing inner ring 16 on a bearing inner ring shot peening reinforcement; aligning the muzzle of the spray gun to the bearing inner ring 16;
4) rotating the turntable 1 at a constant speed, and enabling the spray gun to move up and down at a constant speed to perform shot peening strengthening; the shot peening parameters are set as follows:
the shot blasting pressure of the channel and the raceway is 0.45-0.55 MPa, the shot blasting flow of the channel and the raceway is 6Kg/min, the rotating speed of a turntable of the channel and the raceway is 15rmp, the moving speed of a spray gun of the channel and the raceway is 50mm/min, the distance between a nozzle of the channel and a nozzle of the raceway and the surface of a workpiece is 80-120 mm, the blasting reciprocating moving distance of the channel and the raceway is the width of the raceway plus 20cm, and the shot blasting angle of the raceway is 90 degrees; the shot blasting time of the channel and the raceway is determined according to the following formula,
t is 6.7 multiplied by the surface area cm of the raceway2X (raceway width +20 cm)/raceway width
And (4) shot peening strengthening the outer ring and the inner ring of the bearing, namely, the shot peening strengthening of the working surface of the bearing ring is completed.
For the roller bearing ring without the flange, the rotating speed of the turntable and the moving speed of the spray gun need to be adjusted according to the deformation condition of the part after shot blasting.
The process route determination method of the embodiment is as follows:
after the shot peening strengthening is considered, the bearing ring can generate plastic deformation, the surface of the part can be provided with a surface damage layer after the shot peening, the subsequent processing procedure is needed after the shot peening of the surface of the part, and the final surface residual stress is the result of the combined action of the shot peening treatment, the stress removal treatment and the subsequent processing of the shot peening surface. Therefore, after the bearing ring finely grinds the channel, shot blasting strengthening is carried out before the channel is finally ground, stress relieving treatment is carried out after strengthening, and the circulation mode is as follows:
coarse grinding cycle → fine grinding cycle → shot peening → stress relief treatment → finish grinding cycle → acid washing, dehydrogenation → finishing, flaw detection → fine grinding.
The machining allowance of the raceway after shot blasting in the present embodiment is explained as follows:
the bearing raceway needs to be subjected to finish grinding and finish grinding after shot blasting reinforcement, the surface removal depth after shot blasting is 0.04-0.06 mm on the premise of ensuring uniform secondary surface stress, and the removal amount in the diameter direction is 0.08-0.12 mm, so that a damaged layer on the surface of the raceway can be removed, and considerable surface compressive stress can be obtained.
The shot region of the present embodiment is explained as follows:
taking an XX-type short cylindrical bearing outer ring and an XX-type short cylindrical bearing inner ring as an example (as shown in fig. 2), the outer ring is provided with a double-flange structure, and the inner ring is of a non-flange structure. The raceway of the ring is the working surface of the bearing, shot peening treatment is carried out on the raceway, and the rest surfaces are non-working surfaces, so shot peening treatment is not needed.
The principle of shot peening according to the present embodiment
Under the impact of the shot, the material surface layer generates cyclic plastic deformation, and the material surface layer generates three changes:
1) the surface layer generates high residual compressive stress
2) Plastic deformation thinning tissue formed on the surface layer
3) Increased microscopic stress in the surface layer
In the shot blasting process, shots repeatedly strike the surface of the material, and finally the depth of a plastic deformation layer, namely a strengthening layer, is formed near the surface of the material, wherein the depth of the plastic deformation layer is 0.1-0.8 mm. The introduction of the surface plastic deformation layer is reasonably utilized, and the fatigue and stress corrosion resistance of the material can be improved.
Design of shot peening tool in the embodiment
The bearing raceway can produce great plastic deformation after shot peening strengthening, causes the ovality increase, and after follow-up processing improved the ovality, the surplus of getting rid of in the raceway circumferencial direction was inhomogeneous, can lead to the compressive stress value on raceway circumferential surface to have great difference, and surface stress state distributes unevenly promptly, and this kind of surface condition is unfavorable for improving the fatigue resistance ability of raceway. Therefore, a special tool for shot peening needs to be designed to control the plastic deformation of the bearing ring caused by shot peening.
The bearing ring shot peening strengthening tool is positioned in an end face pressing mode, HRC 40-45 is adopted after integral heat treatment, the inner wall of the outer ring tool and the outer diameter of the bearing outer ring are in clearance fit (shown in figure 2), the outer wall of the inner ring tool and the inner diameter of the inner ring are also in clearance fit (shown in figure 3), meanwhile, in order to avoid the stress concentration phenomenon generated by shot peening strengthening at the corners, protection to oil grooves, oil holes and corners is fully considered during tool design, and the strengthening tool is subjected to chamfering treatment.
The sixth specific implementation mode: this embodiment is different from the specific embodiment in the following point: and in the shot peening strengthening process, the edge where the raceway is connected with the oil groove is protected.
The other components and the connection mode are the same as the fifth embodiment mode.
The seventh embodiment: this embodiment is different from the specific embodiment in the following point: the specification of the reinforced pill: phi 1.4 mm; hardness: HV 610-670; the surface of the pill is processed by removing edges and burrs and rounding.
The other components and the connection mode are the same as the fifth embodiment mode.
The specific implementation mode is eight: this embodiment is different from the specific embodiment in the following point: the shot peening strengthening of the working surface of the bearing ring is carried out after the bearing ring finely grinds the channel and before the channel is finally ground
The other components and the connection mode are the same as the fifth embodiment mode.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
To make the objects, aspects and advantages of the embodiments of the present invention more apparent, the following detailed description clearly illustrates the spirit of the disclosure, and any person skilled in the art, after understanding the embodiments of the disclosure, may make changes and modifications to the technology taught by the disclosure without departing from the spirit and scope of the disclosure.
The exemplary embodiments and descriptions of the present invention are provided to explain the present invention and not to limit the present invention.
The beneficial effects of the present invention are demonstrated by the following examples:
example 1
The shot peening device structure applied to the working surface of the bearing ring of the present embodiment is as described in the first to fourth embodiments.
The shot regions of the present embodiment are determined as follows:
taking an XX-type short cylindrical bearing outer ring and an XX-type short cylindrical bearing inner ring as an example (as shown in fig. 1), the outer ring is provided with a double-flange structure, and the inner ring is of a non-flange structure. The raceway of the ring is the working surface of the bearing, shot peening treatment is carried out on the raceway, and the rest surfaces are non-working surfaces, so shot peening treatment is not needed.
Shot blasting working form of the embodiment:
during shot peening strengthening, the workpiece rotates at a constant speed, the spray gun moves up and down at a constant speed along the axial direction, and the shot peening incidence direction is vertical to the strengthened surface of the workpiece. The workpiece rotating speed, the spray gun moving speed, the shot blasting flow and the shot blasting wind pressure can be controlled and adjusted, and the working mode is shown in figure 4.
The specification of the reinforced pellet of the embodiment: phi 1.4 mm; hardness: HV 610-670.
The execution standard is as follows: the American space flight material Specification Standard SAEJ441 or the German spring Association Standard VDF 18001-2009; the surface of the pellets was subjected to chamfering and deburring (G3).
The shot peening process parameters of the embodiment
Figure BDA0002334740330000071
Figure BDA0002334740330000081
The method for peening is applied to strengthen the working surface of the bearing ring, the peening strengthening tool and the peening strengthening parameters are optimized through reasonable process flow, the surface compressive stress value of the bearing raceway can be controlled to be larger than 800MPa, the depth of an effective strengthening layer is larger than 0.15mm, the compressive stress value at the position of 0.1mm on the subsurface is larger than 450MPa, the stress distribution of the strengthened raceway surface is uniform, and the surface stress distribution curve of a part is shown in figure 5.

Claims (10)

1. A shot peening strengthening device applied to the working surface of a bearing ring is characterized in that the shot peening strengthening device consists of a shot peening strengthening tool for a bearing outer ring and a shot peening strengthening tool for a bearing inner ring;
the shot peening strengthening tool for the bearing outer ring comprises a rotary table (1), a lower die holder (2), an upper pressing plate (3) and a lower protection plate (4);
the lower die holder (2) is of an inverted frustum structure with an upper opening and a hollow interior; the side wall of the upper part of the lower die holder (2) is folded inwards, and a boss (5) is formed in the lower die holder (2);
the lower die holder (2) is connected with the turntable (1) through a nut;
the upper pressure plate (3) is of a circular ring structure, and the outer edge of the inner ring is bent downwards; the lower protection plate (4) is of a circular ring structure, and the outer edge of the inner ring is bent upwards; the lower protection plate (4) is arranged on the boss (5), and the bearing outer ring (6) is arranged on the lower protection plate (4); the upper pressure plate (3) is respectively arranged on the bearing outer ring (6) and the upper surface of the turntable (1), and the upper pressure plate (3) is connected with the turntable (1) through a countersunk head bolt (7); the bearing outer ring (6) is tightly matched with the lower protection plate (4), the upper pressing plate (3) and the inner wall of the lower die holder (2);
the raceway or the channel of the bearing outer ring (6) faces the interior of the lower die holder (2);
the shot blasting strengthening tool for the bearing inner ring comprises a first upper rotary table (11), a second lower die base (12), a first upper pressure plate (13) and a first countersunk head bolt (17);
the second lower die holder (12) is of a cylindrical structure with an upper opening and a hollow interior, and the bottom of the second lower die holder (12) extends outwards to form an outer edge;
the lower die base II (12) is connected with the rotary disc I (11) through a nut; the bearing inner ring (16) is arranged on an outer edge formed by the outward extension of the bottom of the lower die holder II (12); the upper pressing plate I (13) is of an original disc-shaped structure; the upper pressure plate I (13) is arranged on the rotating disc I (11) and is in contact with the upper surface of the bearing inner ring (16), and the countersunk head bolt I (17) sequentially penetrates through a threaded hole in the center of the upper pressure plate I (13) and a threaded hole in the center of the rotating disc I (11) to connect the upper pressure plate I (13) and the rotating disc I (11) together; and the bearing inner ring machining workpiece (16) is tightly matched with the upper pressure plate I (13) and the rotating disc I (11).
2. The shot peening strengthening device applied to the working surface of the bearing ring according to the claim 1, characterized in that a plurality of threaded holes are opened in the central area of the bottom of the lower die holder (2), and a threaded hole is opened in the central area of the upper part of the turntable (1); and the nuts are respectively in threaded connection with the threaded holes of the lower die holder (2) and the threaded holes of the turntable (1), and the lower die holder (2) is connected with the turntable (1).
3. The shot peening device applied to the working surface of the bearing ring according to claim 1, wherein a plurality of threaded holes are formed in the central area of the bottom of the lower die holder II (12), and threaded holes are formed in the central area of the upper part of the rotary table I (11); and respectively connecting the nut with the threaded hole of the lower die seat II (12) and the threaded hole of the rotary table I (11) in a threaded manner, and connecting the lower die seat II (12) and the rotary table I (11) together.
4. A shot peening device applied to a working surface of a bearing ring according to claim 1, wherein the width of the projection (5) is greater than the width of the bearing outer ring (6).
5. A method for shot peening a working surface of a bearing ring using the apparatus of claim 1, characterized by the steps of:
firstly, shot peening strengthening of a bearing outer ring:
1) mounting the bearing outer ring (6) on a shot blasting strengthening device of the bearing outer ring; then, a muzzle of the spray gun is arranged in the shot peening strengthening tool of the bearing outer ring, so that the muzzle of the spray gun is aligned to the bearing outer ring (6);
2) the uniform-speed rotating turntable (1) is arranged on a shot blasting machine, and the shot blasting machine drives a spray gun to move up and down at a uniform speed to perform shot blasting reinforcement; the shot peening parameters are set as follows:
the shot blasting pressure of the channel and the raceway is 0.45-0.55 MPa, the shot blasting flow of the channel and the raceway is 6Kg/min, the rotating speed of a turntable of the channel and the raceway is 15rmp, the moving speed of a spray gun of the channel and the raceway is 50mm/min, the distance between a nozzle of the channel and a nozzle of the raceway and the surface of a workpiece is 80-120 mm, the blasting reciprocating moving distance of the channel and the raceway is the width of the raceway plus 20cm, and the shot blasting angle of the raceway is 90 degrees;
the shot blasting time of the channel and the raceway is determined according to the following formula,
t is 6.7 multiplied by the surface area cm of the raceway2X (raceway width +20 cm)/raceway width
Secondly, shot peening strengthening of the bearing inner ring:
3) mounting the bearing inner ring (16) on a bearing inner ring shot blasting reinforcement device; aligning the muzzle of the spray gun to the bearing inner ring (16);
4) rotating the turntable (1) at a constant speed, and enabling the spray gun to move up and down at a constant speed to perform shot peening strengthening; the shot peening parameters are set as follows:
the shot blasting pressure of the channel and the raceway is 0.45-0.55 MPa, the shot blasting flow of the channel and the raceway is 6Kg/min, the rotating speed of a turntable of the channel and the raceway is 15rmp, the moving speed of a spray gun of the channel and the raceway is 50mm/min, the distance between a nozzle of the channel and a nozzle of the raceway and the surface of a workpiece is 80-120 mm, the blasting reciprocating moving distance of the channel and the raceway is the width of the raceway plus 20cm, and the shot blasting angle of the raceway is 90 degrees; the shot blasting time of the channel and the raceway is determined according to the following formula,
t is 6.7 multiplied by the surface area cm of the raceway2X (raceway width +20 cm)/raceway width
And (4) shot peening strengthening the outer ring and the inner ring of the bearing, namely, the shot peening strengthening of the working surface of the bearing ring is completed.
6. A method according to claim 5, wherein the edge where the raceway meets the gallery is protected during shot peening.
7. The method of claim 5, wherein the reinforcing pellets are of the size: phi 1.4 mm; hardness: HV 610-670; the surface of the pill is processed by removing edges and burrs and rounding.
8. The method of claim 5, wherein shot peening the working surface of the bearing ring is performed after the bearing ring has been grooved and before final grooving.
9. The method of claim 5, wherein the peening angles of the outer race and inner race grooves are determined based on the contact angles of the steel balls with the grooves.
10. A method according to claim 5, characterized in that the rotary disc (1) is driven by the shot-blasting machine to rotate at a constant speed, and the shot-blasting machine drives the spray gun to move up and down at a constant speed.
CN201911351362.4A 2019-12-24 2019-12-24 Device applied to bearing ring working surface and shot peening strengthening method thereof Active CN111085943B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101358271A (en) * 2008-09-26 2009-02-04 无锡透平叶片有限公司 Blade root surface strengthening method
CN201313282Y (en) * 2008-11-20 2009-09-23 贾维静 Thin-walled cylinder sleeve honing fixture
CN201702593U (en) * 2010-05-31 2011-01-12 杭州大和热磁电子有限公司 Machining jig for products such as sheets and rings
CN102483093A (en) * 2010-02-23 2012-05-30 日本精工株式会社 Roller bearing and process for producing same
CN102581759A (en) * 2012-03-13 2012-07-18 苏州市福迈精密机械有限公司 Thin wall processing fixture
CN202780821U (en) * 2012-08-30 2013-03-13 自贡硬质合金有限责任公司 Grinding fixture for stepped products
CN203236240U (en) * 2013-05-22 2013-10-16 西北轴承股份有限公司 Novel clamp for machining thin-wall bearing ring
CN106625061A (en) * 2015-10-30 2017-05-10 北京实验工厂 Grinding method for excircle of inner hole of ultraprecise thin-wall shaft sleeve part

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101358271A (en) * 2008-09-26 2009-02-04 无锡透平叶片有限公司 Blade root surface strengthening method
CN201313282Y (en) * 2008-11-20 2009-09-23 贾维静 Thin-walled cylinder sleeve honing fixture
CN102483093A (en) * 2010-02-23 2012-05-30 日本精工株式会社 Roller bearing and process for producing same
CN201702593U (en) * 2010-05-31 2011-01-12 杭州大和热磁电子有限公司 Machining jig for products such as sheets and rings
CN102581759A (en) * 2012-03-13 2012-07-18 苏州市福迈精密机械有限公司 Thin wall processing fixture
CN202780821U (en) * 2012-08-30 2013-03-13 自贡硬质合金有限责任公司 Grinding fixture for stepped products
CN203236240U (en) * 2013-05-22 2013-10-16 西北轴承股份有限公司 Novel clamp for machining thin-wall bearing ring
CN106625061A (en) * 2015-10-30 2017-05-10 北京实验工厂 Grinding method for excircle of inner hole of ultraprecise thin-wall shaft sleeve part

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