CN106609322A - Bearing ring and heat treatment method thereof - Google Patents
Bearing ring and heat treatment method thereof Download PDFInfo
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- CN106609322A CN106609322A CN201510697843.6A CN201510697843A CN106609322A CN 106609322 A CN106609322 A CN 106609322A CN 201510697843 A CN201510697843 A CN 201510697843A CN 106609322 A CN106609322 A CN 106609322A
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Abstract
The invention relates to a bearing ring and a heat treatment method thereof. The bearing ring is manufactured by through quenching steel. The inner circumferential face or the outer circumferential face of the bearing ring is provided with a roller way. The heat treatment method comprises the steps that the bearing ring is subjected to through quenching; and after through quenching, the circumferential face of the side, opposite to the roller way, of the bearing ring is annealed. According to the method, the beneficial effects of the through quenching steel are reserved, and the existing through quenching steel full-crack danger can be relieved or eliminated.
Description
Technical field
The present invention relates to field of bearings, and in particular to a kind of race ring and its heat treatment method.
Background technology
Heat treatment is that metal material is placed on into heating in certain medium, insulation, cooling, by changing material
The metallurgical structure of material surface or inside is controlling a kind of metal heat processing technique of its performance.
The heat treatment of race ring is one of important process in race ring manufacture process, with other processing technique
Compare, heat treatment does not typically change the chemical composition of the shape of race ring and entirety, but by changing axle
Hold the microscopic structure inside circle, or the chemical composition on change race ring surface to improve the use of race ring
Performance, improves the quality of race ring.
At present, manufacture the raw material that uses of race ring have carburizing steel, it is logical quench steel, wherein quenching steel manufacture to logical
The Technology for Heating Processing of race ring include marquench and Bainitic hardening, also can impewdance matching；To oozing
The Technology for Heating Processing of the race ring of carbon steel manufacture is carburizing and quenching.
Carburizing and quenching technique it is relatively costly, but have preferable anti-entire crack energy because centre hardness is low
Power；And the logical cost quenched is relatively low, but the race ring for being formed is all high with larger because of surface and centre hardness
Entire crack risk.And impewdance matching can accomplish simply functional areas hardening, but for complex-shaped workpiece
Special induction heating equipment is needed with big workpiece, technology difficulty is larger.
The content of the invention
The problem that the present invention is solved is carburizing and quenching high cost in the heat treatment method of existing race ring, is led to
Quench the race ring to be formed entire crack risk it is big, the technology difficulty of impewdance matching is big.
To solve the above problems, the present invention provides a kind of heat treatment method of race ring, and the race ring is
Logical to quench steel, the inner peripheral surface or outer peripheral face of the race ring have raceway, including：The race ring is carried out
It is logical to quench；Lead to after quenching, the side face of the side opposite with the raceway of the race ring is annealed.
Optionally, it is described to be annealed into induction heating and annealing, flame annealing, or laser annealing；It is described to move back
Austenite transition temperature Ac1 of the maximum heating temperature of fire less than steel.
Optionally, the induction heating and annealing is heated using sensing heater.
Optionally, each position of the side face carries out the induction heating and annealing simultaneously；Or, it is described
Side face is divided into some regions, and to regional the induction heating and annealing is carried out respectively.
Optionally, it is described logical to quench for marquench or Bainitic hardening.
Optionally, hardness is annealed to the side face less than or equal to 550HV.
Optionally, after the annealing, the race ring is in the minimum-depth that raceway side is not annealed：With
The 5% of the diameter of the rolling element that the raceway coordinates.
Optionally, the race ring is in the depth bounds that raceway side is not annealed：Coordinate with the raceway
Rolling element diameter 5%～7%.
The present invention also provides a kind of race ring, and in inner peripheral surface or outer peripheral face raceway, the race ring are provided with
Including：First annular circle with the first hardness, and the second annular ring with the second hardness, it is described
, around the outer peripheral face of the first annular circle, or the first annular ring is around described for second annular ring
The outer peripheral face of second ring circle, the raceway is located at the first annular circle, and second hardness is less than described
First hardness.
Optionally, the first annular circle quenches steel manufacture by logical, and it is marquench to lead to heat treatment when quenching,
Or for Bainitic hardening.
Optionally, the hardness of second annular ring is less than or equal to 550HV.
Optionally, radially, the minimum thickness of the first annular circle is：Coordinate with the raceway
Rolling element diameter 5%.
Optionally, radially, the thickness of the first annular circle is：The rolling coordinated with the raceway
The 5%～7% of the diameter of kinetoplast.
Compared with prior art, technical scheme has advantages below：
The material selection of race ring is logical to be quenched steel, first race ring is carried out it is logical quench, then to race ring and raceway
The side face of opposite side is annealed.The homogeneous martensite of hardness or bayesian are obtained by logical the quenching of low cost
Body is organized, then by induction heating and annealing so that the martensite of non-raceway side or bainite structure continue
Tempering is decomposed, hardness reduction, while producing volume receipts because martensite or bainite structure continue to be tempered to decompose
Contracting, in raceway side compressive stress is formed, so as to improve the ability of race ring cracking resistance, while improving its fatigue
Life-span, and technology difficulty is low.
Description of the drawings
The step of Fig. 1 is the heat treatment method of embodiment of the present invention middle (center) bearing circle is schemed；
Fig. 2 shows the partial section in axial direction of embodiment of the present invention middle (center) bearing inner ring；
Fig. 3 shows the partial section in axial direction of embodiment of the present invention axis bearing outer-ring；
Fig. 4 shows the hardness after induction heating and annealing and depth curve figure.
Specific embodiment
As mentioned in the background art, carburizing and quenching technique is relatively costly, but due to center portion it is hard
Degree is low preferable anti-entire crack ability；And the logical cost quenched is relatively low, but the race ring for being formed because surface with
Centre hardness is all high with larger entire crack risk.Here labor is made to this.
Carburizing and quenching is mainly used in the heat treatment of the race ring by carburizing steel making.Due to the carbon containing of carburizing steel
Amount is low, and the hardness after quenching can not reach the use requirement of bearing.Therefore need by surface functional layer
(such as raceway) carries out carburizing, forms the higher carburized layer of phosphorus content, so that carburized layer after quenching
Hardness can reach the use requirement of bearing, while so that the center portion of race ring keeps soft.
Carburizing and quenching includes the multiple working procedures such as carburizing, annealing and final quenching.In carburization step, carbon is needed
Will at high temperature, at a temperature of such as 960 DEG C, in diffusing into carburizing steel.Whole carburizing process needs
The time of consuming is very long, for example, to form 3 millimeters of carburized layer, and required carburizing time will be little more than 30
When.In addition, race ring is susceptible to deformation at a high temperature of 960 DEG C, therefore in carburization process, in order to
Avoid the deformation of race ring excessive, thus carburizing and quenching generally require using clamping quenching (or claim clamping quench
Fire, die quenching), to reduce deformation, this requires to make special mould or fixture.Generally speaking,
Therefore the cost of carburization process is very high.
In addition, in the carburization step of carburizing and quenching, because temperature is high, the time is long, causing race ring table
To race ring diffusion inside, causing the textura epidermoidea of race ring can deteriorate oxygen in the carburizing atmosphere of face,
For example there is internal oxidition etc., so that race ring is at the position (such as at the groove at raceway edge) not being ground
Intensity and impact value decline.
Logical quenching is mainly used in by the heat treatment of the logical race ring for quenching steel manufacture.It is logical to quench steel after logical quenching, axle
Hold circle hardness radially everywhere almost identical, and the logical cost quenched is far below carburizing and quenching.
But, compared with carburizing and quenching, the logical race ring to be formed of quenching faces bigger entire crack risk.One side
Face, in use, CONTACT WITH FRICTION between raceway and rolling element, when raceway face because friction is peeled off
After can crack, and form stress concentration in the cracks, cause crackle to spread along depth direction.Separately
On the one hand, for bearing inner race, if bearing inner race is too big with the interference fit of axle, bearing inner race
Will be due to being ftractureed by circumferential stress；For bearing outer ring, bearing outer ring is located at bearing block
On, generally, the mating surface between bearing outer ring and bearing block not ensured that and fit completely, and this will
Cause bearing outer ring due to being ftractureed by bending stress.
For the race ring that carburizing and quenching is formed, because centre hardness is low, toughness is high, the expansion of crackle
Exhibition slows down in center portion and even stops, but for the logical race ring to be formed of quenching, due to race ring everywhere
Hardness is homogeneous, and the extension of crackle may not terminate, and ultimately result in entire crack.
Induction hardening is also a kind of method of race ring heat treatment, is generally used for functional areas (for example
Raceway) pass through sensing heating to austenitizing temperature, then quench.Induction coil needs special sensing to add
Hot equipment, such as suitable induction coil.If the size of induction coil can cover the need of the raceway of race ring
Hardened area so that the raceway of race ring uniform heating simultaneously, then can reach good quenching effect.
But for the race ring of some complicated shapes or big size, common sensing heating can not be complete
The full hardened area for being uniformly heated up race ring simultaneously, if for the race ring of big size will be felt
Heating quenching is answered, there are two kinds of selections：One is to customize powerful induction heating equipment in addition while equably
The hardened area of heating race ring, this can undoubtedly increase cost and technology difficulty.Two is using common sense
Answer firing equipment that hardened area is divided into into some subregions, then each sub-regions are felt in order
Answer heating quenching, i.e. subregion induction hardening.Subregion induction hardening the disadvantage is that, by
When in induction hardening, the hardening heat of hardened area edge may be slightly below central area
Hardening heat, then when previous subregion quenching finish, it is adjacent when quenching to latter subregion
The temperature at the boundary position between two subregions is possible to that annealing region can be exactly in so that have a common boundary
Position softens and forms soft ribbons, causes hardness not up to standard, and it is special without soft ribbons sensing heating to be that this will be customized
Quenching apparatus, so as to increase cost and technology difficulty.
In addition, particularly with some are complex-shaped, while for larger-size race ring, or even due to
The difficulty all too of induction hardening cannot be implemented greatly.
Based on the problems referred to above, the embodiment of the present invention proposes a kind of heat treatment method of new race ring, can use
In substitute race ring is adopted at present logical quench, the heat treatment method of carburizing and quenching or induction hardening.
This method is particularly suitable for use with the logical race ring for quenching steel manufacture, remains the logical heat treatment low cost of quenching steel
Advantage, and the existing logical entire crack risk for quenching steel can be mitigated or eliminated.
It is understandable to enable the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings
The specific embodiment of the present invention is described in detail.
The embodiment of the present invention provides a kind of heat treatment method of race ring, be particularly well-suited to it is logical quench steel, including
What is obtained after martensite and bainitic heat treatment logical quenches steel.Race ring can be outside bearing inner race or bearing
Circle, the inner peripheral surface that the outer peripheral face of wherein bearing inner race has raceway, bearing outer ring has raceway.
With reference to shown in Fig. 1, the heat treatment method includes：Logical quenching is carried out to race ring；Lead to after quenching, it is countershaft
The side face for holding the side opposite with raceway of circle is annealed.
As can be seen here, in the heat treatment method of the present embodiment, it is divided into two steps：
Step one：Logical quenching is carried out to race ring；
Step 2：The side face of the side opposite with raceway of race ring is annealed.
Below to illustrating respectively to above-mentioned two step.
(1) implementation steps one, logical quenching is carried out to race ring.
Logical also referred to as normal quenching of quenching, refers to metal works are heated to into a certain proper temperature and is kept for one section
Time, the metal heating processing technology of quick continuous coo1ing in quenching media is immersed immediately, for increasing metal
The hardness of workpiece.Logical conventional quenching media of quenching has salt, water, oil, air etc..
In the present embodiment, the logical purpose quenched is so that race ring forms the martensitic structure or bayesian of hardening phase
Body is organized.Wherein, the logical referred to as martensite of quenching of acquisition martensitic structure leads to and quenches, and obtains bainite structure
Logical referred to as bainite of quenching leads to be quenched.
Specifically, lead to when quenching, first race ring is heated to into 830 DEG C～860 DEG C, be then incubated at such a temperature
10～20 minutes, then race ring is put in quenching media and is in extremely rapid succession cooled down, to form martensite group
Knit or bainite structure.In the present embodiment, the type of cooling includes obtaining martensitic structure by oil cooling, with
And martensite or bainite structure are obtained by the cooling of salt bath isothermal.
During oil cooling, the temperature range of oil is between 60 DEG C～80 DEG C.The race ring led to after quenching is put in oil, cold
But to less than 200 DEG C, such as take out when being cooled to 70 DEG C～80 DEG C, obtain martensitic structure.Such as fruit oil
Temperature is more than 80 DEG C, and oil will decompose, aging, cooling effect reduction；Temperature such as fruit oil is less than 60 DEG C,
The mobility of oil is poor, and cooling effect also will be undesirable.
When salt bath is cooled down, can be using sodium nitrite, potassium nitrate salt-mixture as quenching media.By salt plus
To uniform temperature, it to melt and form salt bath heat will occur, the temperature range of salt bath 180 DEG C～260 DEG C it
Between.Race ring is put in salt bath, is cooled to after salt temperature and is taken out, obtain martensitic structure.Such as
Salt temperature is stopped in salt bath and will obtain bainite structure in 2～6 hours in bainite transformation temperature, race ring.
For oil cooling, evenly, the deformation of race ring is less, after cooling for the cold cooling effect of salt
The circularity of the race ring of formation is more preferable, thus the stock removal needed in subsequent handling will be less.
In this enforcement, raceway, if forming tension in functional areas, is incited somebody to action as the functional areas of race ring
Its fatigue life is reduced, if functional areas form compressive stress, will be improved its fatigue life.Martensite leads to
After quenching, in raceway side, (i.e. the side face with raceway) will form tension.Bainite is logical quench after, in rolling
Road side forms compressive stress.If martensite is logical quenching, typically also need to be tempered after logical quenching, to carry
High its toughness.
(2) implementation steps two, such as Fig. 2, Fig. 3, to the side face of the side opposite with raceway of race ring (or
Claim non-raceway side) annealed.Wherein, non-raceway side is annealed, it is meant that annealing depth will not
Extend to raceway side.That is, annealing depth is necessarily less than the radial thickness of race ring.Fig. 2 is illustrated
Bearing inner race partial section in axial direction.Fig. 3 shows bearing outer ring office in axial direction
Portion's sectional view.
Such as Fig. 2, for bearing inner race, raceway 10 is located at the outer peripheral face of bearing inner race, therefore, annealed zone
The surface in domain 20 is the inner peripheral surface of bearing inner race.Annealing depth is up to dotted line position in Fig. 2.
Such as Fig. 3, for bearing outer ring, raceway 10 is located at the inner peripheral surface of bearing outer ring, therefore, annealed zone
The surface in domain 20 is the outer peripheral face of bearing inner race.Annealing depth is up to dotted line position in Fig. 3.
When logical quenching, the specific volume of material can change in race ring, and the tissue in race ring will be from
Original ferrite, the mixture of cementite, the martensitic structure being changed into after quenching or bainite structure,
The specific volume of material will increase in race ring.
In annealing, for annealing region, carbon is by from the martensitic structure or bainite structure of hardening phase
Diffuse out so that annealing region volume contraction, so as to form one to unannealed region (i.e. raceway side)
Individual compressive stress, and ftractureed in raceway side by compressive stress opposing race ring, raising race ring is anti-to be opened
The ability split.Simultaneously as the compressive stress can resist race ring extraneous stress suffered when in use, because
And can also increase the fatigue life of bearing.
As it was previously stated, martensite is logical quench after, raceway side forms tension, then, after annealing, raceway side
Tension translate into compressive stress.Bainite is logical quench after, raceway side forms compressive stress, then, annealing
Afterwards, the compressive stress of raceway side will increase.
As shown in Fig. 2 as a example by bearing inner race, wherein bearing inner race is the martensite steel after logical quenching.
Before annealing, in axial direction sectioning bearing inner race, the whole cross section that obtains is radially everywhere
Hardness is identical, for about 700HV (Vickers hardness, units/kg/mm2).During annealing, bearing inner race
Inner peripheral surface is heated annealing.
After annealing, as shown in figure 4, wherein Fig. 4 shows that race ring is radially everywhere after annealing
Hardness and annealing depth relationship, wherein abscissa represents the distance (mm) away from annealing surface, and distance is bigger,
Represent more remote apart from annealing surface, it is nearer apart from raceway；Vertical coordinate represents hardness (HV3), and numerical value is bigger,
Then hardness is higher；Curve represents the hardness and depth curve of annealing.
It can be seen from figure 4 that with the increase away from annealing surface distance, hardness becomes big.In raceway side
The hardness on surface remain at about 700HV, while forming the compressive stress of about 330MPa；And in annealing
The hardness on the surface of side is down to about 500HV, while forming the tension of about 31MPa.During experiment, select
The bearing inner race of taper roll bearing, 100.82 millimeters of the interior Jing of the bearing inner race, 67.18 millimeters of width,
Induction coil, to about 700 DEG C, and is water-cooled on the inside of the endoporus of bearing inner race is heated simultaneously in raceway side.
It can be seen that, in the present embodiment, by annealing in non-raceway side to race ring so that annealing region
Tissue contracts, hardness reduce, to form compressive stress in raceway side, improve the toughness of non-raceway side, from
And the ability of raising race ring cracking resistance, while improving its fatigue life.
Wherein, the depth of annealing can be adjusted by annealing time and power.
On the one hand from, the depth of annealing is deeper, then raceway side compressive stress is bigger, race ring cracking resistance
Ability and fatigue life it is better.
But, according to from the point of view of the load that the diameter and bearing of the rolling element coordinated with raceway are born,
Race ring must have the hardened layer of certain depth in raceway side, and in other words raceway side must be in certain depth
In the range of retain sufficiently high hardness so that raceway has enough load capacity, same as functional areas
When with enough endurance qualities.
In the present embodiment, for the service behaviour in assurance function area, hardened layer of the race ring in raceway side
Minimum-depth is：The 5% of the rolling element diameter coordinated with raceway.That is, after annealing, race ring exists
The minimum-depth that raceway side is not annealed is the 5% of the rolling element diameter coordinated with raceway.Preferably, bearing
Enclosing can be in the depth bounds of the hardened layer of raceway side：The 5%～7% of the rolling element diameter coordinated with raceway
Between.
On the other hand, the hardness of annealing region is less, then the toughness of non-raceway side is better, race ring
The ability of cracking resistance is better.In the present embodiment, during annealing, when annealing to the side face of non-raceway side,
Hardness is annealed to less than or equal to 550HV.
Wherein, annealing can be induction heating and annealing, flame annealing, or laser annealing.The present embodiment
Using induction heating and annealing.
Wherein, induction heating and annealing refers to the annealing process carried out using induction heating technique.Sensing heating
Annealing includes two steps of sensing heating and cooling.
Sensing heating step：Annealing region is heated to into the austenite transition temperature Ac1 less than steel, its
Middle Ac1 is generally 723 DEG C or slightly below 723 DEG C, that is to say, that during induction heating and annealing, and sensing adds
The maximum heating temperature of heat is 723 DEG C.Now, non-annealing region needs to be maintained at the logical tempering temperature of quenching of martensite
Below degree or bainite treatment temperature, in such as less than 200 DEG C of temperature, can be carried out by water-cooled.
That is, during annealing region is heated, non-annealing region is in water-cooled state.
Cooling step：When annealing region is heated when 723 DEG C or slightly below 723 DEG C, immediately by whole axle
Hold circle to be cooled down so as to be cooled to less than 200 DEG C.The type of cooling can adopt water-cooled.
Further, for the side face corresponding to annealing region, each position carries out sensing and adds simultaneously
Thermal annealing；Or, side face is divided into some regions, and to regional induction heating and annealing is carried out respectively.
When carrying out sensing heating to race ring, typically using sensing heater, such as induction heating circle.Heating
When, induction heating circle is located at the side of annealing region, the i.e. outer peripheral face of the inner peripheral surface of inner ring, outer ring, so
Input AC electricity, formation alternating magnetic field and the generation in the annealing region of race ring in induction heating circle afterwards
The faradic current of same frequency so that the surface of annealing region is heated rapidly.
The axial length of induction heating circle can be corresponding to the axial length of race ring, while heating is entirely needed
The surface of annealing, it is also possible to less than the axial length of race ring, it is whole that induction coil is axially moveable partition heating
Individual annealing region.
During partition heating, sensing heater can also semi-circular or sector, the then annealing region of race ring
Multiple regions can be circumferentially divided into, and be heated successively by induction heating circle.
The present embodiment also provides a kind of race ring, as shown in Figure 2 and Figure 3, race ring can be inner ring or
The inner peripheral surface that the outer peripheral face of outer ring, wherein inner ring has raceway, outer ring has raceway.The race ring includes：
First annular circle with the first hardness, and the second annular ring with the second hardness, the second ring
, around the outer peripheral face of first annular circle, or first annular ring is around the outer peripheral face of the second annular ring for shape ring.
Raceway is located at first annular circle, and on first annular circle with the dorsad side face of the second annular ring side,
Second hardness is less than the first hardness.
If bearing inner race, as shown in Fig. 2 radial outside of the first annular circle positioned at the second annular ring,
Raceway 10 is located on the outer peripheral face of first annular circle；If bearing outer ring, as shown in figure 3, then first
Annular ring is located at the radially inner side of the second annular ring, and raceway 10 is located on the inner peripheral surface of first annular circle.
Wherein, first annular circle quenches steel manufacture by logical, and it is to be formed after marquench to lead to heat treatment when quenching
Martensite steel, or the bainitic steel formed after Bainitic hardening, the hardness of first annular circle is for about
700HV。
The hardness of the second annular ring is less than or equal to 550HV.Preferably, the hardness of the second annular ring can be with
Less than or equal to 500HV.
Wherein, radially, the minimum thickness of first annular circle is：The rolling element coordinated with raceway
The 5% of diameter.Preferably, the thickness of first annular circle is the diameter of the rolling element coordinated with raceway
5%～7%.
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art,
Without departing from the spirit and scope of the present invention, can make various changes or modifications, therefore the guarantor of the present invention
Shield scope should be defined by claim limited range.
Claims (13)
1. a kind of heat treatment method of race ring, the race ring is quenched steel for logical, the inner peripheral surface of the race ring or
Outer peripheral face has raceway, it is characterised in that include：
Logical quenching is carried out to the race ring；
Lead to after quenching, the side face of the side opposite with the raceway of the race ring is annealed.
2. heat treatment method as claimed in claim 1, it is characterised in that described to be annealed into induction heating and annealing,
Flame annealing, or laser annealing；
Austenite transition temperature Ac1 of the maximum heating temperature of the annealing less than steel.
3. heat treatment method as claimed in claim 2, it is characterised in that the induction heating and annealing is using sense
Heater is answered to be heated.
4. heat treatment method as claimed in claim 3, it is characterised in that each position of the side face is simultaneously
Carry out the induction heating and annealing；Or, the side face is divided into some regions, to regional point
The induction heating and annealing is not carried out.
5. heat treatment method as claimed in claim 1, it is characterised in that it is described it is logical quench for marquench or
Bainitic hardening.
6. heat treatment method as claimed in claim 1, it is characterised in that hardness is annealed to the side face little
In or equal to 550HV.
7. heat treatment method as claimed in claim 1, it is characterised in that after the annealing, the race ring
The minimum-depth not being annealed in raceway side is：The 5% of the diameter of the rolling element coordinated with the raceway.
8. heat treatment method as claimed in claim 7, it is characterised in that the race ring raceway side not by
The depth bounds of annealing is：The 5%～7% of the diameter of the rolling element coordinated with the raceway.
9. a kind of race ring, in inner peripheral surface or outer peripheral face raceway is provided with, it is characterised in that the race ring bag
Include：
First annular circle with the first hardness, and the second annular ring with the second hardness, described
, around the outer peripheral face of the first annular circle, or the first annular ring is around described second for second ring ring
The outer peripheral face of annular ring, the raceway is located at the first annular circle, and second hardness is less than described the
One hardness.
10. race ring as claimed in claim 9, it is characterised in that the first annular circle quenches steel manufacture by logical,
Logical heat treatment when quenching is marquench, or for Bainitic hardening.
11. race rings as claimed in claim 9, it is characterised in that the hardness of second annular ring be less than or
Equal to 550HV.
12. race rings as claimed in claim 9, it is characterised in that radially, the first annular circle
Minimum thickness be：The 5% of the diameter of the rolling element coordinated with the raceway.
13. race rings as claimed in claim 12, it is characterised in that radially, the first annular circle
Thickness be：The 5%～7% of the diameter of the rolling element coordinated with the raceway.
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| CN109082504A (en) * | 2018-08-28 | 2018-12-25 | 洛阳Lyc轴承有限公司 | A kind of super-huge 42CrMo double-split bearing ring raceway face process for quenching |
| CN109897952A (en) * | 2019-04-10 | 2019-06-18 | 清华大学 | A kind of heat treatment method and device for bearing internal external circle Stress Control |
| CN113061710A (en) * | 2021-02-25 | 2021-07-02 | 克莱斯克斯轴承(北京)有限公司 | Bearing anti-seismic heat treatment process |
| CN115181847A (en) * | 2021-12-31 | 2022-10-14 | 常熟天地煤机装备有限公司 | Gear and preparation method thereof |
| CN115725828A (en) * | 2022-11-28 | 2023-03-03 | 山东台稳精密机械有限公司 | Slider induction heat treatment processing technology |
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| CN109082504A (en) * | 2018-08-28 | 2018-12-25 | 洛阳Lyc轴承有限公司 | A kind of super-huge 42CrMo double-split bearing ring raceway face process for quenching |
| CN109897952A (en) * | 2019-04-10 | 2019-06-18 | 清华大学 | A kind of heat treatment method and device for bearing internal external circle Stress Control |
| CN113061710A (en) * | 2021-02-25 | 2021-07-02 | 克莱斯克斯轴承(北京)有限公司 | Bearing anti-seismic heat treatment process |
| CN115181847A (en) * | 2021-12-31 | 2022-10-14 | 常熟天地煤机装备有限公司 | Gear and preparation method thereof |
| CN115181847B (en) * | 2021-12-31 | 2024-05-07 | 常熟天地煤机装备有限公司 | Gear and preparation method thereof |
| CN115725828A (en) * | 2022-11-28 | 2023-03-03 | 山东台稳精密机械有限公司 | Slider induction heat treatment processing technology |
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