CN103590050B - Worm part carburization quenching method - Google Patents
Worm part carburization quenching method Download PDFInfo
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- CN103590050B CN103590050B CN201310627319.2A CN201310627319A CN103590050B CN 103590050 B CN103590050 B CN 103590050B CN 201310627319 A CN201310627319 A CN 201310627319A CN 103590050 B CN103590050 B CN 103590050B
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Abstract
The invention discloses a kind of worm part carburization quenching method, described worm part material is 20CrNiMo steel, comprises the following steps: A. machining worm part outer and teeth portion, wherein cylindrical made allowance; B. the overall carburizing treatment of worm part slow cooling; C. cylindrical surplus is removed; D. the overall micro-carburizing and quenching process of worm part; E. surface working is carried out to finished product to worm part, worm part carburization quenching method of the present invention, abandon in prior art and adopted masking paste to carry out the method for Anti-seeping technology to the periphery of worm part except teeth portion, eliminate the negative impact of speed of cooling when product is quenched and hardening capacity, make the tooth face hardness of worm part and periphery hardness all can reach processing request.
Description
Technical field
The present invention relates to a kind of heat treating method, particularly relate to a kind of worm part carburization quenching method.
Background technology
20CrNiMo is a kind of low-carbon alloy structural steel being widely used in gear manufacture, there is good welding property and cold strain plasticity, generally improve comprehensive use properties by modified or carburizing and quenching, for worm part, usually require that its tooth face hardness reaches 56-62HRC, effective hardness layer 1.80-2.20mm, periphery except the flank of tooth need do Anti-seeping technology, hardness requirement is 30-45HRC, therefore in order to make worm part reach processing request, the general treatment process all adopting carburizing and quenching, in prior art, be coated with masking paste in the excircle part except the flank of tooth during carburizing and quenching process to worm part to protect, according to GB/T6141.3-92, product metallographic structure is qualified, worm part tooth face hardness is 57-58HRC, the cylindrical hardness of antiseepage is 17-18HRC, from assay, antiseepage part cylindrical hardness does not reach processing request, detect through metallographic, the tissue of product is ferrite and pearlite substantially, be in as-annealed condition, its reason be masking paste had a strong impact on product quenching time speed of cooling and hardening capacity.
Therefore, for solving the problem, needing a kind of worm part carburization quenching method, making the tooth face hardness of worm part and periphery hardness all can reach processing request.
Summary of the invention
In view of this, the object of this invention is to provide a kind of worm part carburization quenching method, abandon in prior art and adopted masking paste to carry out the method for Anti-seeping technology to the periphery of worm part except teeth portion, eliminate the negative impact of speed of cooling when product is quenched and hardening capacity, make the tooth face hardness of worm part and periphery hardness all can reach processing request.
Worm part carburization quenching method, described worm part material is 20CrNiMo steel, and the method comprises the following steps: A. machining worm part outer and teeth portion, wherein cylindrical made allowance; B. the overall carburizing treatment of worm part slow cooling; C. cylindrical surplus is removed; D. the overall micro-carburizing and quenching process of worm part; E. surface working is carried out to finished product to worm part;
Further, in described step B, the carbon potential of carburizing treatment is 1.25-1.10%, and carburizing temperature is 930 DEG C, and carburizing time is 400min, and case depth is 1.0-1.2mm, and the slow cooling time is 90min;
Further, monolateral surplus is stayed to be 3.0-3.5mm in described steps A;
Further, in institute step D, during micro-carburizing and quenching process, in stove, carbon potential is 0.70-0.72%, and the cool time is 108-112 minute, and quenching temperature is 878-882 DEG C, and depth of hardening is 1.0-1.3mm;
Further, in described step e, surface manufacturing condition is cylindrical grinding.
Worm part carburization quenching method of the present invention, abandon in prior art and adopted masking paste to carry out the method for Anti-seeping technology to the periphery of worm part except teeth portion, eliminate the negative impact of speed of cooling when product is quenched and hardening capacity, make the tooth face hardness of worm part and periphery hardness all can reach processing request.
Embodiment
The worm part carburization quenching method of the present embodiment, described worm part material is 20CrNiMo steel, and the method comprises the following steps: A. machining worm part outer and teeth portion, wherein cylindrical made allowance; B. the overall carburizing treatment of worm part slow cooling; C. cylindrical surplus is removed; D. the overall micro-carburizing and quenching process of worm part; E. surface working is carried out to finished product to worm part.
In the present embodiment, in described step B, the carbon potential of carburizing treatment is 1.25-1.10%, and carburizing temperature is 930 DEG C, and carburizing time is 400min, and case depth is 1.0-1.2mm, and the slow cooling time is 90min; Under this condition, carburizing treatment can make worm part obtain top layer high-carbon, pass through quench treatment afterwards, the top layer of workpiece is made to have high rigidity and wear resistance, and the centre portions of workpiece still remains the toughness before carburizing and plasticity, by with upper type process, can mechanical workout be met, anti-carburizing treatment can be made to Anti-seeping technology part again.
In the present embodiment, monolateral surplus in described steps A, is stayed to be 3.0-3.5mm; Under the car-burization condition of step B, this surplus layer can be permeated and make the micro-carburizing state of its inner formation, can surface hardness be met the requirements of by follow-up quench treatment after removing surplus, can increase the service life compared to prior art; Get rid of the cylindrical surplus being less than 2.5mm in step C, residue balance is removed during surface working by step e.
In the present embodiment, in institute step D, during micro-carburizing and quenching process, in stove, carbon potential is 0.70-0.72%, and the cool time is 108-112 minute, and quenching temperature is 878-882 DEG C, and depth of hardening is 1.0-1.3mm; Under this condition, quench treatment significantly can improve the intensity of worm part, hardness, wear resistance, fatigue strength and toughness, improve the twisting strength of worm part, extend its work-ing life, the C of quenching employing about 0.7% carries out micro-Carbon pick-up, both core toughness had been kept during quenching, the part hardness of antiseepage increases again, strengthens wear-resistant and don't increases fragility.
In the present embodiment, in described step e, surface manufacturing condition is cylindrical grinding, and the process redundancy of ground finish is few, is convenient to control product size precision; Working accuracy is high simultaneously, and general grinding can obtain IT5-7 class precision, and surfaceness can reach Ra0.2-1.6um, and product can be made to reach processing request.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. a worm part carburization quenching method, described worm part material is 20CrNiMo steel, it is characterized in that: comprise the following steps: A. machining worm part outer and teeth portion, wherein cylindrical made allowance; B. the overall carburizing treatment of worm part slow cooling; C. cylindrical surplus is removed; D. the overall micro-carburizing and quenching process of worm part, during micro-carburizing and quenching process, in stove, carbon potential is 0.70-0.72%, and the cool time is 108-112 minute, and quenching temperature is 878-882 DEG C, and depth of hardening is 1.0-1.3mm; E. surface working is carried out to finished product to worm part; In described step B, the carbon potential of carburizing treatment is 1.25-1.10%, and carburizing temperature is 930 DEG C, and carburizing time is 400min, and case depth is 1.0-1.2mm, and the slow cooling time is 90min.
2. worm part carburization quenching method according to claim 1, is characterized in that: stay monolateral surplus to be 3.0-3.5mm in described steps A.
3. worm part carburization quenching method according to claim 1, is characterized in that: in described step e, surface manufacturing condition is cylindrical grinding.
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| CN103590050B true CN103590050B (en) | 2016-03-23 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105118730A (en) * | 2015-09-19 | 2015-12-02 | 宁波铭德电气科技有限公司 | Vacuum circuit breaker with long service life |
| CN106594231B (en) * | 2016-12-19 | 2019-04-23 | 大大科技(宁国)有限公司 | A kind of worm-gear type jack |
| CN107313002A (en) * | 2017-05-15 | 2017-11-03 | 滁州亿扬零部件制造有限公司 | A kind of worm tooth wheel shaft heat treatment processing method |
| CN107236847A (en) * | 2017-07-31 | 2017-10-10 | 世通海泰泵业（天津）股份有限公司 | A kind of processing technology of hydraulic pump worm screw |
| CN110408882B (en) * | 2019-08-26 | 2021-10-01 | 山东亨格尔智能科技有限公司 | Anti-carburizing treatment method |
| CN115156563A (en) * | 2022-07-12 | 2022-10-11 | 重庆蓝黛传动机械有限公司 | Machining process for planet gear ring of welded structure |
| CN118028735B (en) * | 2024-02-20 | 2024-08-02 | 西安煤矿机械有限公司 | One-step carburization method for same piece and different layer of driving wheel of mining machine |
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| CN103341743A (en) * | 2013-07-08 | 2013-10-09 | 河北华北柴油机有限责任公司 | Anti-cracking machining method of small axial surface carburizing and hardening stepped shaft with end face provided with groove |
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| CN103341743A (en) * | 2013-07-08 | 2013-10-09 | 河北华北柴油机有限责任公司 | Anti-cracking machining method of small axial surface carburizing and hardening stepped shaft with end face provided with groove |
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