CN103924056A - Quenching process for bearing steel shaft pin parts - Google Patents
Quenching process for bearing steel shaft pin parts Download PDFInfo
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- CN103924056A CN103924056A CN201410167362.XA CN201410167362A CN103924056A CN 103924056 A CN103924056 A CN 103924056A CN 201410167362 A CN201410167362 A CN 201410167362A CN 103924056 A CN103924056 A CN 103924056A
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Abstract
The invention relates to a quenching process for bearing steel shaft pin parts. As a blank, bearing steel is machined into shaft pin parts, the quenching process comprises the following steps: (1) checking whether the spheroidizing annealed structure of the parts is qualified, if yes, performing the step (2); (2) putting the parts in a heating furnace, and controlling the heating temperature to be 875-885DEG C, carbon potential to be 0.6-0.7%, and heating time to be 40-50min; (3) enabling the parts to fall in an oil tank for quenching at the quenching oil temperature of 60-80DEG C, wherein the quenching cooling time is 5-10min; and (4) tempering, wherein when the hardness of the parts is required for 61-65HRC, the tempering temperature is at 165-185DEG C, and the tempering time is 2.5-3h, and when the hardness of the parts is required for 58-62HRC, the tempering temperature is at 200-215DEG C, and the tempering time is 2.5-3h. By strictly controlling the spheroidizing annealed structure of the parts and changing the heating temperature, furnace carbon potential Cp and other thermal treatment technological parameters, the time per hour is shortened by 10-15min compared with the conventional treatment time, and on the premise that guaranteeing the quality index of quenching thermal treatment is guaranteed, the purposes of obviously improving the equipment productivity, and decreasing the production energy consumption can be achieved.
Description
Technical field
The present invention relates to a kind of quenching technology of bearing steel shaft parts.
Background technology
Bearing steel quenches, has after tempering high rigidity, good wear resistance and high contact fatigue property extensively as the blank of producing shaft parts because of it.When manufacturing enterprise produces in the quenching to bearing steel pin shaft parts, consider the requirement aspect metallographic structure rank, distortion and hardness after client is to parts quenching, to determining of the heat treatment process parameter such as Heating temperature, soaking time, conventionally select within associated hot is processed the scope of recommending in handbook.Along with fast lifting, progressively improving of material manufacture level and constantly the improving and improve of thermal treatment process of heat treatment process device control precision, processes is produced routinely, exists production energy consumption higher, the problem that production efficiency is not high.
Summary of the invention
The present invention has overcome the deficiencies in the prior art, and the quenching technology of the bearing steel shaft parts that a kind of cost is low, efficiency is high is provided.
For achieving the above object, the technical solution used in the present invention is: a kind of quenching technology of bearing steel shaft parts, taking bearing steel as embryo material, be processed into shaft parts, and then adopt following steps:
(1) whether the Spheroidizing Annealing of inspection part is organized qualifiedly, if qualified, carries out step (2);
(2) part is inserted in process furnace, heating and temperature control is at 875-885 DEG C, and carbon-potential control, at 0.6-0.7%, is controlled at 40-50min heat-up time;
(3) part falls into oil groove quenching, and quenching oil temperature is 60-80 DEG C, and the quench cooled time is 5-10min;
(4) tempering, in the time requiring part hardness to be 61-65HRC, tempering temperature is 165-185 DEG C, tempering time is 2.5-3h; In the time requiring part hardness to be 58-62HRC, tempering temperature is 200-215 DEG C, and tempering time is 2.5-3h.
In a preferred embodiment of the present invention, the quenching technology of bearing steel shaft parts further comprises in described step (1), whether evaluate Spheroidizing Annealing according to JB/T 1255-2001 standard first level figure and organize qualifiedly, if qualified, part Spheroidizing Annealing is organized in 2-4 level.
In a preferred embodiment of the present invention, the quenching technology of bearing steel shaft parts further comprises that, in described step (2), process furnace is continuous meshbeltfurnace.
In a preferred embodiment of the present invention, the quenching technology of bearing steel shaft parts further comprises that the layer thickness in described process furnace is 25-35mm.
In a preferred embodiment of the present invention, the quenching technology of bearing steel shaft parts further comprises that, in described step (3), the quenchant in oil groove is bright quenc hing oil.
In a preferred embodiment of the present invention, the quenching technology of bearing steel shaft parts be further included in described step (3) afterwards, step (4) before, also comprise the steps: to sample in time and do the inspection of metallographic structure.
In a preferred embodiment of the present invention, the quenching technology of bearing steel shaft parts is further included in described step (4) afterwards, also comprises the steps: to sample in time and do the inspection of metallographic structure.
In a preferred embodiment of the present invention, the quenching technology of bearing steel shaft parts further comprises that the material of described embryo material is the bearing steel that in GB/T 18254-2002, the trade mark is GCr15.
The invention solves the defect existing in background technology, when the present invention produces bearing steel shaft parts in batches, under the prerequisite dropping into without any utility appliance or increase, by strict control supplied materials Spheroidizing Annealing tissue, change Heating temperature simultaneously, the heat treatment process parameters such as the interior carbon potential Cp of stove, the shaft parts of the same output of quench treatment, per hour than conventional processing time shorten 10-15min, ensureing quench part metallographic structure, under the prerequisite of the thermal treatment quality such as hardness and distortion index, reach and significantly improve equipment capacity, reduce the object of production energy consumption, there is application value.
Brief description of the drawings
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the metallographic structure adopting after conventional thermal treatment process is quenched;
Fig. 2 is the Spheroidizing Annealing tissue that part supplied materials is good;
Fig. 3 adopts thermal treatment process of the present invention to quench to produce the metallographic structure of rear part.
Embodiment
The present invention is further detailed explanation in conjunction with the accompanying drawings and embodiments now, and these accompanying drawings are the schematic diagram of simplification, and basic structure of the present invention is only described in a schematic way, and therefore it only shows the formation relevant with the present invention.
Below introduce the inventive method, a kind of quenching technology of bearing steel shaft parts, taking bearing steel as embryo material, is processed into shaft parts, then adopts following steps:
(1) whether the Spheroidizing Annealing of inspection part is organized qualifiedly, and inspecting standard is whether JB/T 1255-2001 standard first level figure evaluates Spheroidizing Annealing and organize qualifiedly, if qualified, part Spheroidizing Annealing is organized in 2-4 level, carries out step (2); Shown in Fig. 2, be the Spheroidizing Annealing tissue that part supplied materials is good, Spheroidizing Annealing tissue can be chosen as 3 grades;
(2) part is inserted in process furnace, heating and temperature control is at 875-885 DEG C, and carbon-potential control, at 0.6-0.7%, is controlled at 40-50min heat-up time; Process furnace is continuous meshbeltfurnace, and enter heating furnace door to part from part and fall into oil groove meter heat-up time.Layer thickness in the preferred process furnace of the present invention is 25-35mm.
(3) part falls into oil groove quenching, and quenching oil temperature is 60-80 DEG C, and the quench cooled time is 5-10min, and the quench cooled time is to fall into oil-quenching tank to the total time that goes out oil groove from part; Quenchant in oil groove is bright quenc hing oil;
(4) sample in time and do the inspection of metallographic structure.Such as good 2 grades of quenching structures are cryptocrystalline martensite+tiny crystallization martensite+equally distributed tiny Residual Carbides+residual austenite body tissue on a small quantity.By checking its metallographic structure, not only can evaluate the quality of quench part tissue, the great quality accident such as avoid in time scrapping in batches, and by metallographic examination, can find in time whether parts processed exists decarburization or carburetting, quenching soft spot, quenching crack and heating installation whether to have gas leakage, the unequal problem of furnace temperature, and then further take appropriate measures and corrected, guarantee processing parts quality, reduce the production cost of enterprise.
(5) tempering, in the time requiring part hardness to be 61-65HRC, tempering temperature is 165-185 DEG C, tempering time is 2.5-3h; In the time requiring part hardness to be 58-62HRC, tempering temperature is 200-215 DEG C, and tempering time is 2.5-3h.In the time of the given heat treatment hardness scope of design, if make stiffness units with HRC, conventionally the scope of employing+3/-2 is carried out given concrete stiffness units, and consider many-sided influence factors such as parts processed material status, equipment for Heating Processing control accuracy and processing power, designing given hardness must be an interval range, as long as detect part hardness within the scope of it, all can judge that its hardness meets the requirements.Due in batch product treating processes, the hardness value of each part is not the same, in every batch of part there is a scattered error in the hardness of each part, but all within design requirements scope, the tempering temperature that bis-durometer levels of 61-65HRC and 58-62HRC require is different in order to ensure the hardness of every batch of part.
(6) sample in time and do the inspection of metallographic structure.Because for any heat treatment process part, pass judgment on the quality of its thermal treatment quality, first must judge that whether its organization factors is good, detects other technical requirements such as heat treatment hardness, distortion and then.Like this, in the time that part organization factors is poor, need not waste the follow-up time for detection of heat treatment hardness, distortion.
For further description method of the present invention, as preferred version, we adopt the bearing steel that in GB/T 18254-2002, the trade mark is GCr15 to realize method of the present invention as embryo material:
(1) whether the Spheroidizing Annealing of inspection part is organized qualifiedly, and inspecting standard is whether national standard JB/T 1255-2001 standard first level figure evaluates Spheroidizing Annealing and organize qualifiedly, if qualified, part spherodized structure, at 3 grades, is carried out step (2);
(2) part is inserted in process furnace, heating and temperature control is at 880 DEG C, and carbon-potential control, 0.65%, is controlled at 45min heat-up time; Process furnace is continuous meshbeltfurnace, and enter heating furnace door to part from part and fall into oil groove meter heat-up time; Layer thickness in the preferred process furnace of the present invention is 30mm;
(3) part falls into oil groove quenching, and quenching oil temperature is 70 DEG C, and the cool time is 10min; Quenchant in oil groove is bright quenc hing oil;
(4) sample in time and do the inspection of metallographic structure.
(5) tempering, in the time requiring part hardness to be 61-65HRC, tempering temperature is 180 DEG C, tempering time is 2.8h; In the time requiring part hardness to be 58-62HRC, tempering temperature is 205 DEG C, and tempering time is 2.8h.
(6) sample in time and do the inspection of metallographic structure.
Fig. 1 is the metallographic structure adopting after conventional thermal treatment process is quenched, and Fig. 3 is the metallographic structure of part after adopting thermal treatment process quenching of the present invention to produce, and Fig. 1, Fig. 3 are all shown as good quenching structure.The present invention, by after process modification, shortening the treatment time, reducing under the prerequisite of production energy consumption, can guarantee part metallographic structure rank equally.
Be enlightenment according to desirable embodiment of the present invention above, by above-mentioned description, related personnel can, not departing from the scope of this invention technological thought, carry out various change and amendment completely.The technical scope of this invention is not limited to the content on specification sheets, must determine technical scope according to claim scope.
Claims (8)
1. a quenching technology for bearing steel shaft parts, is characterized in that, taking bearing steel as embryo material, is processed into shaft parts, then adopts following steps:
(1) whether the Spheroidizing Annealing of inspection part is organized qualifiedly, if qualified, carries out step (2);
(2) part is inserted in process furnace, heating and temperature control is at 875-885 DEG C, and carbon-potential control, at 0.6-0.7%, is controlled at 40-50min heat-up time;
(3) part falls into oil groove quenching, and quenching oil temperature is 60-80 DEG C, and the quench cooled time is 5-10min;
(4) tempering, in the time requiring part hardness to be 61-65HRC, tempering temperature is 165-185 DEG C, tempering time is 2.5-3h; In the time requiring part hardness to be 58-62HRC, tempering temperature is 200-215 DEG C, and tempering time is 2.5-3h.
2. the quenching technology of bearing steel shaft parts according to claim 1, it is characterized in that, in described step (1), according to JB/T 1255-2001 standard first level figure evaluate Spheroidizing Annealing organize whether qualified, if qualified, part Spheroidizing Annealing is organized in 2-4 level.
3. the quenching technology of bearing steel shaft parts according to claim 1, is characterized in that, in described step (2), process furnace is continuous meshbeltfurnace.
4. the quenching technology of bearing steel shaft parts according to claim 3, is characterized in that, the layer thickness in described process furnace is 25-35mm.
5. the quenching technology of bearing steel shaft parts according to claim 1, is characterized in that, in described step (3), the quenchant in oil groove is bright quenc hing oil.
6. the quenching technology of bearing steel shaft parts according to claim 1, is characterized in that, described step (3) afterwards, step (4) before, also comprise the steps: to sample in time and do the inspection of metallographic structure.
7. the quenching technology of bearing steel shaft parts according to claim 1, is characterized in that, in described step (4) afterwards, also comprises the steps: to sample in time and do the inspection of metallographic structure.
8. the quenching technology of bearing steel shaft parts according to claim 1, is characterized in that, the material of described embryo material is the bearing steel that in GB/T 18254-2002, the trade mark is GCr15.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410167362.XA CN103924056A (en) | 2014-04-24 | 2014-04-24 | Quenching process for bearing steel shaft pin parts |
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| CN201410167362.XA CN103924056A (en) | 2014-04-24 | 2014-04-24 | Quenching process for bearing steel shaft pin parts |
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Citations (5)
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| CN101126387A (en) * | 2007-09-07 | 2008-02-20 | 无锡鹰贝机械有限公司 | Production process of high-purity plunger piston |
| CN102108433A (en) * | 2011-04-01 | 2011-06-29 | 瓦房店轴承集团有限责任公司 | Method for quenching bearing steel |
| CN102174936A (en) * | 2011-03-09 | 2011-09-07 | 松下·万宝(广州)压缩机有限公司 | Slide block for rotary type compressor and manufacturing method thereof |
| CN102399968A (en) * | 2011-10-29 | 2012-04-04 | 洛阳市洛凌轴承科技股份有限公司 | Thermal treatment process of high-carbon chromium bearing ring |
| EP1517058B1 (en) * | 2003-09-19 | 2013-05-01 | JTEKT Corporation | Rolling bearing part and method for manufacturing the same |
-
2014
- 2014-04-24 CN CN201410167362.XA patent/CN103924056A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1517058B1 (en) * | 2003-09-19 | 2013-05-01 | JTEKT Corporation | Rolling bearing part and method for manufacturing the same |
| CN101126387A (en) * | 2007-09-07 | 2008-02-20 | 无锡鹰贝机械有限公司 | Production process of high-purity plunger piston |
| CN102174936A (en) * | 2011-03-09 | 2011-09-07 | 松下·万宝(广州)压缩机有限公司 | Slide block for rotary type compressor and manufacturing method thereof |
| CN102108433A (en) * | 2011-04-01 | 2011-06-29 | 瓦房店轴承集团有限责任公司 | Method for quenching bearing steel |
| CN102399968A (en) * | 2011-10-29 | 2012-04-04 | 洛阳市洛凌轴承科技股份有限公司 | Thermal treatment process of high-carbon chromium bearing ring |
Non-Patent Citations (2)
| Title |
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| 程饴萱等: "销轴用材及制造工艺的合理选择", 《科技通报》 * |
| 章守华: "《合金钢》", 31 December 1981 * |
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