CN109097547A - A kind of forging of railway bearing seal receptacle and rta technique - Google Patents
A kind of forging of railway bearing seal receptacle and rta technique Download PDFInfo
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- CN109097547A CN109097547A CN201811095886.7A CN201811095886A CN109097547A CN 109097547 A CN109097547 A CN 109097547A CN 201811095886 A CN201811095886 A CN 201811095886A CN 109097547 A CN109097547 A CN 109097547A
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
The present invention provides a kind of forging of railway bearing seal receptacle and rta techniques, are related to annealing technology field, it is intended to solve the problems, such as that time-consuming for annealing process in the prior art, the forging technology is the following steps are included: A1, heating in medium frequency；A2, jumping-up；A3, the flat height of perforation；It is A4, expanding；A5, whole diameter；A6, cooling；The annealing process is the following steps are included: B1, feed intake；B2, heating；B3, discharging.The present invention reasonably adjusts forging and annealing process according to GCr15 steel phase transition temperature, designs parameter and annealing, while guaranteeing product quality, shortens the time-consuming of annealing process, improves production efficiency.
Description
Technical field
The present invention relates to the forgings and short annealing work of annealing technology field more particularly to a kind of railway bearing seal receptacle
Skill.
Background technique
In the production and processing of seal receptacle, by GCr15 steel forging appearance at forging after, need to forging carry out turnery processing,
Since the difficulty and cost of turnery processing rise steadily with the rising of forging hardness, therefore, it is necessary to finishing to forging, hard
It spends biggish forging to be made annealing treatment, so that the plasticity and toughness that reduce hardness, improve material, facilitate post-processing.
Currently, the Chinese invention patent of publication number CN108277326A discloses a kind of fast spheroidizing annealing of GCr15 bearing steel
Annealing process, this method are the GCr15 bearing steel after hot rolling, are initially made annealing treatment, cool to room temperature with the furnace；It will be first
GCr15 bearing steel after the annealing that begins, is placed in the through heat-treatment furnace in both ends, is heated to 800~850 DEG C of isothermal processes
It after 0.5~1h, then is rolled, the GCr15 bearing steel after being rolled, then is placed in the through heat-treatment furnace in both ends,
In 800~850 DEG C of 0.5~1h of isothermal processes, GCr15 bearing steel after obtaining isothermal processes cools to 720~750 DEG C with the furnace,
It after 0.5~2h of isothermal, is cooling to 550~650 DEG C with the furnace, is being air-cooled to room temperature, obtaining the GCr15 axis of online Fast Spheroidizing Annealing
Hold steel.
Although the invention, by the size of control proeutectoid carbide, the precipitation for the cementite in During Eutectoid Decomposition mentions
For more nucleation sites, to still, not disclosed in text the time required to effectively shortening spheroidizing and be heated to 800-
The time required to 850 DEG C, it is furnace-cooled to 720-750 DEG C of required time, 550-650 DEG C of required time is furnace-cooled to and is air-cooled to needed for room temperature
Time, and according to practical production experience, the above-mentioned steps used time is 6-8 hours, then the comprehensive time-consuming disclosed out, annealing process duration
It is 10-12 hours.
Existing GCr15 seal receptacle annealing process is similar with above-mentioned bearing steel annealing process, and heating, holding temperature are high, adds
Heat, soaking time are long so that subsequent cooling time grows simultaneously, thus, with the sustainable growth of seal receptacle yield, it is time-consuming compared with
Long annealing process causes existing annealing furnace to be difficult to adapt to the growth of yield, needs to carry out the annealing process of existing seal receptacle
It improves, to meet production requirement.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of forging of railway bearing seal receptacle and quickly move back
Fire process, have the advantages that annealing process time-consuming less, high production efficiency.
To realize the above-mentioned technical purpose, the forging and short annealing work of a kind of railway bearing seal receptacle provided by the invention
Skill, the forging technology the following steps are included:
A1: GCr15 steel wool base is put and is heated into intermediate frequency furnace, is heated to 1050-1150 DEG C by heating in medium frequency；
A2: blank obtained by A1 is put to jumping-up, extrusion forming on press machine, controls jumping-up temperature >=1000 DEG C by jumping-up；
A3: the flat height of perforation perforates blank obtained by A2 to form cyclic structure, and smooth height；
A4: it is expanding, blank obtained by A3 is put to rolling on staving press and is formed, expanding completion temperature is 800-900 DEG C；
A5: blank obtained by A4 is put to whole diameter is carried out on press machine, determines size by whole diameter；
A6: it is cooling, it is cooled down using uniform droplet to get forging is arrived；
The annealing process the following steps are included:
B1: feeding intake, and sets control parameter, and forging obtained by A6 is put into annealing furnace；
B2: heating starts annealing furnace, heats to forging, and heating temperature is 750-830 DEG C；
B3: discharging discharges air-cooled to get to turning part after forging is furnace-cooled to set temperature.
By adopting the above technical scheme, since the seal receptacle is applied to railway bearing, the thermal treatment quality of the seal receptacle
Only hardness requirement, and therefore inorganization requirement under the premise of meeting product quality, is annealed by matched forging
Technique processes seal receptacle, and 750-830 DEG C of heating, holding temperature is selected to handle forging, and is guaranteeing seal receptacle thermal treatment quality
Under the premise of unaffected, lower annealing temperature can not only reduce heating time, moreover it is possible to the cooling time after shortening heating,
To which annealing process time-consuming be greatly reduced, and then yield is improved, meets production requirement.
In some embodiments, the mass percent of the GCr15 steel contains element and each element are as follows: C is
0.95%-1.05%, Cr 1.50%-1.65%, Si 0.15%-0.35%, Mn 0.3%-0.4%, Ni≤0.25%, S≤0.02%,
P≤0.02%, Cu≤0.25%, Ti 0.003%, Mo 0.05-0.07%, Al 0.03%-0.04%, surplus are Fe and can not keep away
Exempt from impurity.
By adopting the above technical scheme, not only have by the GCr15 steel of the above-mentioned each element percentage composition of selection as raw material
There is excellent processing performance, also there is excellent institutional framework, so that the forging after short annealing can satisfy after forging
Properties of product requirement.
In some embodiments, in the A6, the structure medium pearlite of the forging is arranged in the form of sheets, and between piece
Away from for 100-200nm, carbide is in netted setting in the structure of the forging, and its thickness is less than 1.5um.
By adopting the above technical scheme, the purpose of annealing is convenient for machining not only for hardness is reduced, or in order to obtain
Acinous pearlitic structrure is obtained, makees tissue preparation for quenching；Meanwhile the fine platy of fusing is easier in spheroidizing heating process
The selection of pearlite and laminar net carbide cooperation processing temperature, even if temperature is shorter than lower than conventional annealing temperature, time
Conventional annealing technique is time-consuming, still ensures that product quality, meanwhile, energy consumption can be reduced, time-consuming, increase yield is reduced；In addition, piece
The thinner lamellar pearlite of spacing, Fe3C lamella is thinner, and the epipole formed after fusing is more, more uniform, so that subsequent cold
But during nodularization, by suitably accelerating cooling velocity and shortening the nodularization time, the carbonization in the spherodized structure of formation is controlled
Composition granule more evenly, it is tiny, be conducive to improve bearing wearability and contact fatigue property.
In some embodiments, in the B1, the annealing furnace is GKT-90 type roller-bottom type protective atmosphere vacuum air-changing
Pneumoelectric composite heating isothermal spheroidizing furnace.
By adopting the above technical scheme, using GKT-90 type roller-bottom type protective atmosphere vacuum air-changing pneumoelectric composite heating isothermal ball
Annealing furnace carries out annealing operation, annealing quality better than the standard requirements such as JB/T1225-2014, anneal to turning part group
Knit it is tiny, be uniformly distributed, realize efficient, the fine quality production of spheroidizing.
In some embodiments, it in the B2, after the forging is heated to 785-830 DEG C and isothermal holding, is furnace-cooled to
It 725 DEG C and keeps the temperature, then comes out of the stove after being furnace-cooled to 590-610 DEG C air-cooled.
By adopting the above technical scheme, forging annealing operation is carried out using isothermal spheroidizing technique, according to the phase of GCr15 steel
Temperature selects lower austenitizing temperature and higher isothermal transformation temperature, makes the carbide spheroidization in steel, obtains in iron
Equally distributed spherical or granular carbide on ferritic body reduces hardness, improves turning ability.
In some embodiments, the forging is heated to 780-830 DEG C and keeps the temperature 100min, is furnace-cooled to 725 DEG C and protects
Warm 100-150min.
By adopting the above technical scheme, by the selection of isothermal spheroidizing technique and lower heating temperature, isothermal temperature,
So that the time needed for heating process and constant temperature process is reduced, and then shortens entire annealing process required time, production effect is improved
Rate.
In some embodiments, it in the B2, after the forging is heated to 750-770 DEG C, is furnace-cooled to 550-610 DEG C and goes out
Furnace is air-cooled.
By adopting the above technical scheme, using common annealing process, lower heating temperature is selected, both can guarantee sheet
Pearlite disappears, and can retain the carbide that a part is not completely dissolved in austenite, forms spherodized structure, and due in forging
Pearlite is carefully thin, carbide is tiny and disperses, and therefore, the nodularization time is shorter, to further shorten entire annealing process
Time-consuming improves production efficiency.
In some embodiments, the heating time of forgings is 220-260min, then row furnace is cold.
By adopting the above technical scheme, it is time-consuming to reduce common annealing process, while reducing temperature, cooperates shortening
The nodularization time, time-consuming is further decreased, improved efficiency.
In conclusion compared with prior art, the present invention having the advantage that
1. reasonably adjusting forging and annealing process according to GCr15 steel phase transition temperature, suitable parameter is designed, is guaranteeing product quality
While, shorten the time of annealing process, improves production efficiency.
Detailed description of the invention
Fig. 1 is a kind of forging of railway bearing seal receptacle of the present invention and the forging of rta technique 2 gained forging of implementation
Make state organization chart.
Specific embodiment
The size of the seal receptacle disclosed in following embodiment are as follows: inner ring 168mm, outer ring 180mm, height 31mm, and it is following
Embodiment is not limited only to for the seal receptacle, applies also for other sizes, similar forging tissue forging.
And the phase transition temperature of GCr15 steel used is as shown in table 1:
Table 1
Embodiment 1:
A kind of forging of railway bearing seal receptacle and rta technique, wherein forging technology the following steps are included:
A101: selection chooses GCr15 as raw material, wherein the mass percent of element and each element that GCr15 steel contains
Are as follows: C 0.95%, Cr 1.50%, Si 0.15%, Mn 0.3%, Ni 0.25%, S 0.02%, P 0.02%, Cu are
0.25%, Ti 0.003%, Mo 0.05%, Al 0.03%, surplus are Fe and inevitable impurity.
A102: GCr15 steel wool base is put and is heated into intermediate frequency furnace, is heated to 1050 DEG C.
A2: jumping-up puts blank obtained by A1 to jumping-up, extrusion forming on press machine, and controlling jumping-up temperature is 1000 DEG C.
A3: the flat height of perforation perforates blank obtained by A2 to form ring structure, and smooth height.
A4: it is expanding, blank obtained by A3 is put to rolling on staving press and is formed, expanding completion temperature is 800 DEG C.
A5: blank obtained by A4 is put to whole diameter is carried out on press machine, determines size by whole diameter.
A6: it is cooling, it is cooled down using uniform droplet to get forging is arrived；
Wherein, in the structure of forging, pearlite is fine platy structure, and piece spacing is 100nm, and net carbide is thin slice
Shape structure, and with a thickness of 0.8um.
Embodiment 2:
A kind of forging of railway bearing seal receptacle and rta technique, wherein forging technology the following steps are included:
A101: selection chooses GCr15 as raw material, wherein the mass percent of element and each element that GCr15 steel contains
Are as follows: C 0.1%, Cr 1.6%, Si 0.25%, Mn 0.35%, Ni 0.2%, S 0.015%, P 0.015%, Cu are
0.2%, Ti 0.003%, Mo 0.06%, Al 0.035%, surplus are Fe and inevitable impurity.
A102: GCr15 steel wool base being put and is heated into intermediate frequency furnace, is heated to 1100 DEG C of
A2: jumping-up puts blank obtained by A1 to jumping-up, extrusion forming on press machine, and controlling jumping-up temperature is 1050 DEG C.
A3: the flat height of perforation perforates blank obtained by A2 to form ring structure, and smooth height.
A4: it is expanding, blank obtained by A3 is put to rolling on staving press and is formed, expanding completion temperature is 800 DEG C.
A5: blank obtained by A4 is put to whole diameter is carried out on press machine, determines size by whole diameter.
A6: it is cooling, it is cooled down using uniform droplet to get forging is arrived；
Wherein, in the structure of forging, pearlite is fine platy structure, and piece spacing is 150nm, and net carbide is thin slice
Shape structure, and with a thickness of 1um.
Embodiment 3:
A kind of forging of railway bearing seal receptacle and rta technique, wherein forging technology the following steps are included:
A101: selection chooses GCr15 as raw material, wherein the mass percent of element and each element that GCr15 steel contains
Are as follows: C 1.05%, Cr 1.65%, Si 0.35%, Mn 0.4%, Ni 0.1%, S 0.005%, P 0.01%, Cu are
0.15%, Ti 0.003%, Mo 0.07%, Al 0.04%, surplus are Fe and inevitable impurity.
A102: GCr15 steel wool base is put and is heated into intermediate frequency furnace, is heated to 1050 DEG C.
A2: jumping-up puts blank obtained by A1 to jumping-up, extrusion forming on press machine, and controlling jumping-up temperature is 1000 DEG C.
A3: the flat height of perforation perforates blank obtained by A2 to form ring structure, and smooth height.
A4: it is expanding, blank obtained by A3 is put to rolling on staving press and is formed, expanding completion temperature is 800 DEG C.
A5: blank obtained by A4 is put to whole diameter is carried out on press machine, determines size by whole diameter.
A6: it is cooling, it is cooled down using uniform droplet to get forging is arrived；
Wherein, in the structure of forging, pearlite is fine platy structure, and piece spacing is 200nm, and net carbide is thin slice
Shape structure, and with a thickness of 1.4um.
Embodiment 4: passing through embodiment 1, embodiment 2 and the resulting forging of embodiment 3 annealing process respectively and handle,
And the annealing process the following steps are included:
B1: feeding intake, and sets heating temperature as 785 DEG C, isothermal holding temperature is 725 DEG C, and isothermal soaking time is 100min, and will
Forging puts into annealing furnace；
Wherein, annealing furnace is GKT-90 type roller-bottom type protective atmosphere vacuum air-changing pneumoelectric composite heating isothermal spheroidizing furnace.
B2: heating starts annealing furnace, is heated to 785 DEG C and keeps the temperature, and heats and consumes 100min altogether with heat preservation, keeps the temperature to isothermal
After, it is furnace-cooled to 590 DEG C.
B3: discharging, after being furnace-cooled to 590 DEG C remove annealing furnace it is air-cooled to get arrive turning part.
After embodiment 1- embodiment 3 is made annealing treatment by embodiment 4, using GB/T231.1 to resulting turning part
It is detected, the turning part hardness for obtaining the embodiment 1 of annealed processing is 208HB, the implementation 2 of obtained annealed processing
Turning part hardness is 201HB, and the turning part hardness of the embodiment 3 of obtained annealed processing is 210HB, and according to JB/
Hardness requirement is 179-207HB after T1225-2014, GCr15 steel ball annealing, therefore, selects satisfactory annealed processing
Embodiment 2 be used as optimal case.
In addition, implement the forging state tissue of 2 gained forging as shown in Figure 1, institutional framework is preferable after forging, thin thin pearly-lustre
In the form of sheets, and piece spacing is smaller, the smaller setting of net carbide thickness for body.
Embodiment 5:
The resulting forging of embodiment 2 is handled by annealing process, the annealing process the following steps are included:
B1: feeding intake, and sets heating temperature as 795 DEG C, isothermal holding temperature is 725 DEG C, and isothermal soaking time is 100min, and will
Forging puts into annealing furnace；
Wherein, annealing furnace is GKT-90 type roller-bottom type protective atmosphere vacuum air-changing pneumoelectric composite heating isothermal spheroidizing furnace.
B2: heating starts annealing furnace, is heated to 795 DEG C and keeps the temperature, and heats and consumes 100min altogether with heat preservation, keeps the temperature to isothermal
After, it is furnace-cooled to 600 DEG C.
B3: discharging, after being furnace-cooled to 600 DEG C remove annealing furnace it is air-cooled to get arrive turning part.
Embodiment 6:
The resulting forging of embodiment 2 is handled by annealing process, the annealing process the following steps are included:
B1: feeding intake, and sets heating temperature as 830 DEG C, isothermal holding temperature is 725 DEG C, and isothermal soaking time is 100min, and will
Forging puts into annealing furnace；
Wherein, annealing furnace is GKT-90 type roller-bottom type protective atmosphere vacuum air-changing pneumoelectric composite heating isothermal spheroidizing furnace.
B2: heating starts annealing furnace, is heated to 830 DEG C and keeps the temperature, and heats and consumes 100min altogether with heat preservation, keeps the temperature to isothermal
After, it is furnace-cooled to 610 DEG C.
B3: discharging, after being furnace-cooled to 610 DEG C remove annealing furnace it is air-cooled to get arrive turning part.
Embodiment 7:
The resulting forging of embodiment 2 is handled by annealing process, the annealing process the following steps are included:
B1: feeding intake, and sets heating temperature as 750 DEG C, and forging is put into annealing furnace；
Wherein, annealing furnace is GKT-90 type roller-bottom type protective atmosphere vacuum air-changing pneumoelectric composite heating isothermal spheroidizing furnace.
B2: heating starts annealing furnace, after being heated to 750 DEG C, cold 550 DEG C of furnace；
Wherein, it is 220min that heating is time-consuming.
B3: discharging, after being furnace-cooled to 550 DEG C remove annealing furnace it is air-cooled to get arrive turning part.
Embodiment 8:
The resulting forging of embodiment 2 is handled by annealing process, the annealing process the following steps are included:
B1: feeding intake, and sets heating temperature as 760 DEG C, and forging is put into annealing furnace；
Wherein, annealing furnace is GKT-90 type roller-bottom type protective atmosphere vacuum air-changing pneumoelectric composite heating isothermal spheroidizing furnace.
B2: heating starts annealing furnace, after being heated to 760 DEG C, is furnace-cooled to 600 DEG C；
Wherein, it is 240min that heating is time-consuming.
B3: discharging, after being furnace-cooled to 600 DEG C remove annealing furnace it is air-cooled to get arrive turning part.
Embodiment 9:
The resulting forging of embodiment 2 is handled by annealing process, the annealing process the following steps are included:
B1: feeding intake, and sets heating temperature as 760 DEG C, and forging is put into annealing furnace；
Wherein, annealing furnace is GKT-90 type roller-bottom type protective atmosphere vacuum air-changing pneumoelectric composite heating isothermal spheroidizing furnace.
B2: heating starts annealing furnace, after being heated to 770 DEG C, is furnace-cooled to 610 DEG C；
Wherein, it is 260min that heating is time-consuming.
B3: discharging, after being furnace-cooled to 610 DEG C remove annealing furnace it is air-cooled to get arrive turning part.
According to the resulting turning part of embodiment 4- embodiment 9, the hardness and mark after measuring annealing time, annealing respectively are deep
Degree, wherein hardness by JB/T1225-2014 be standard, hardness requirement 179-207HB, and identify depth requirements be 0.30-
0.40mm, measured value is referring to table 2.
Table 2
| Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 8 | Embodiment 9 | |
| Time/h | 7.42 | 7.45 | 7.46 | 8.97 | 9.02 | 8.92 |
| Hardness/HB | 201 | 198 | 197 | 199 | 197 | 196 |
| Identify depth/mm | 0.35 | 0.36 | 0.37 | 0.33 | 0.36 | 0.38 |
The resulting turning part of embodiment 4- embodiment 9 is recycled to press 800 DEG C of * 40min+220 DEG C * 180min of existing heat treatment process
Carry out quenching and lonneal processing, and use die quenching mode, measurement heat treatment hardness, after heat treatment size changing amount and
Geometric tolerance, measurement result is referring to table 3；Wherein, heat treatment hardness technical requirements are 57-60HRC.
Table 3
| Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 8 | Embodiment 9 | |
| Hardness/HRC | 58.8 | 58.6 | 58.8 | 58.1 | 58.2 | 58.5 |
| Outer diameter mean change amount/mm | 0.23 | 0.21 | 0.21 | 0.33 | 0.37 | 0.39 |
| Outer diameter ellipse tolerance/mm | 0.08 | 0.06 | 0.07 | 0.07 | 0.07 | 0.06 |
| Outer diameter taper tolerance/mm | 0.03 | 0.03 | 0.02 | 0.01 | 0.02 | 0.02 |
In conclusion the time needed for improved annealing process almost subtracts in contrast to the processing time (12h) in prior art
It is a half, production efficiency is greatly improved, and according to actual production it is found that production capacity can be improved to 10000 daily, together
When, 24 days before not adjusting compared to technique, 130000 seal receptacles of annealing only needed 13 days, and produced resulting seal receptacle matter
Amount is stablized, and standard requirements are met.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. forging and the rta technique of a kind of railway bearing seal receptacle, which is characterized in that the forging technology include with
Lower step:
A1: GCr15 steel wool base is put and is heated into intermediate frequency furnace, is heated to 1050-1150 DEG C by heating in medium frequency；
A2: blank obtained by A1 is put to jumping-up, extrusion forming on press machine, controls jumping-up temperature >=1000 DEG C by jumping-up；
A3: the flat height of perforation perforates blank obtained by A2 to form cyclic structure, and smooth height；
A4: it is expanding, blank obtained by A3 is put to rolling on staving press and is formed, expanding completion temperature is 800-900 DEG C；
A5: blank obtained by A4 is put to whole diameter is carried out on press machine, determines size by whole diameter；
A6: it is cooling, it is cooled down using uniform droplet to get forging is arrived；
The annealing process the following steps are included:
B1: feeding intake, and sets control parameter, and forging obtained by A6 is put into annealing furnace；
B2: heating starts annealing furnace, heats to forging, and heating temperature is 750-830 DEG C；
B3: discharging discharges air-cooled to get to turning part after forging is furnace-cooled to set temperature.
2. forging and the rta technique of a kind of railway bearing seal receptacle according to claim 1, which is characterized in that
The mass percent of element and each element that the GCr15 steel contains are as follows: C 0.95%-1.05%, Cr 1.50%-1.65%,
Si is 0.15%-0.35%, and Mn 0.3%-0.4%, Ni≤0.25%, S≤0.02%, P≤0.02%, Cu≤0.25%, Ti are
0.003%, Mo 0.05-0.07%, Al 0.03%-0.04%, surplus are Fe and inevitable impurity.
3. forging and the rta technique of a kind of railway bearing seal receptacle according to claim 2, which is characterized in that
In the A6, the structure medium pearlite of the forging is arranged in the form of sheets, and piece spacing is 100-200nm, the forging
Carbide is in netted setting in structure, and its thickness is less than 1.5um.
4. forging and the rta technique of a kind of railway bearing seal receptacle according to claim 3, which is characterized in that
In the B1, the annealing furnace is GKT-90 type roller-bottom type protective atmosphere vacuum air-changing pneumoelectric composite heating isothermal spheroidizing
Furnace.
5. forging and the rta technique of a kind of railway bearing seal receptacle according to claim 4, which is characterized in that
In the B2, after the forging is heated to 785-830 DEG C and isothermal holding, it is furnace-cooled to 725 DEG C and keeps the temperature, then be furnace-cooled to 590-
It comes out of the stove after 610 DEG C air-cooled.
6. forging and the rta technique of a kind of railway bearing seal receptacle according to claim 5, which is characterized in that
The forging is heated to 780-830 DEG C and keeps the temperature 100min, is furnace-cooled to 725 DEG C and keeps the temperature 100-150min.
7. forging and the rta technique of a kind of railway bearing seal receptacle according to claim 4, which is characterized in that
In the B2, after the forging is heated to 750-770 DEG C, be furnace-cooled to 550-610 DEG C come out of the stove it is air-cooled.
8. forging and the rta technique of a kind of railway bearing seal receptacle according to claim 7, which is characterized in that
The heating time of forgings is 220-260min, then row furnace is cold.
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