CN105834670B - A kind of process preventing idler wheel delayed crack - Google Patents

A kind of process preventing idler wheel delayed crack Download PDF

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Publication number
CN105834670B
CN105834670B CN201610184541.3A CN201610184541A CN105834670B CN 105834670 B CN105834670 B CN 105834670B CN 201610184541 A CN201610184541 A CN 201610184541A CN 105834670 B CN105834670 B CN 105834670B
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grinding
idler wheel
ageing treatment
wheel
temperature
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CN105834670A (en
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景旭文
周宏根
蔡羽凡
袁春元
王红新
曹利平
李国超
田桂中
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Jiangsu University of Science and Technology
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Jiangsu University of Science and Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P9/00Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings; Features of such surfaces not otherwise provided for, their treatment being unspecified

Abstract

The present invention discloses a kind of process for preventing GCr15 hardened steels from generating delayed crack, includes the steps that rough turn, heat treatment, half fine grinding, ageing treatment, fine grinding.And wherein, half refining stage is to ensure processing efficiency, using common machined parameters;Refining stage is to ensure machining accuracy, and the smaller machined parameters of use reduce grinding temperature.Artificial aging processing is added in centre, discharges the residual stress generated in half lapping process by artificial aging, stable dimensions reduce cracked probability.

Description

A kind of process preventing idler wheel delayed crack
Technical field
The invention belongs to idler wheel technical fields of mechanical processing, and in particular to one kind prevents the generation delay of GCr15 hardened steels from splitting The process of line.
Background technology
Idler wheel is diesel engine fuel pump and the vital part for being vented valve activator, is the transmission between cam and plunger Body bears alternating load in work, more demanding to its surface roughness, intensity, hardness, wearability and fatigue strength, need to adopt With the machining process of " heat treatment+grinding ".
Currently, the main manufacturing procedure of diesel engine roller is:Rough turn → heat treatment → grinding → Traful impregnations.Idler wheel High rigidity with 60~63HRC after heat treatment, in follow-up grinding process, high-speed extrusion of the abrasive grain to workpiece surface, scraping And swiping effect makes grinding area transient temperature up to 1000 DEG C or more, leads to the generation of grinding residual stress.Grinding residual stress It is superimposed with heat treatment early period residual stress, makes grinding rear roller surface that there is more complicated residual stress.In follow-up Traful Residual stress is released in impregnation or the course of work, so that roller surface is generated delayed crack, is led to part rejection, is reduced The service life and reliability of part.
Therefore need a kind of new technical solution to solve the above problems.
Invention content
Goal of the invention:Roller surface is easily led to for prior art and leads to the problem of delayed crack, and the purpose of the present invention exists In a kind of processing technology preventing hardened steel GCr15 idler wheel delayed cracks of offer.
Technical solution:In order to achieve the above objectives, following technical solution can be used in the present invention:
A kind of process preventing idler wheel delayed crack, includes the following steps:
(1), rough turn;
(2), it is heat-treated, wherein including first time ageing treatment in heat treatment;
(3), half fine grinding, and and grinding fluid is just injected machined surface before the grinding of half fine grinding;
(4), second of ageing treatment;Wherein ageing treatment carries out in oil oven, is put into idler wheel, is kept the temperature after idler wheel is heated The soaking time of setting then takes out idler wheel cooling;
(5), fine grinding, and grinding fluid is just injected machined surface before the grinding of fine grinding.
Advantageous effect:Compared with the existing technology, the present invention will be divided into half fine grinding work and essence to the Grinding Process of idler wheel It grinds and ageing treatment is added in centre, by the ageing treatment release residual stress that idler wheel generates in half lapping process, stablize Size reduces cracked probability.Meanwhile ageing treatment does not need special equipment, can be carried out in common oil oven;At timeliness Easy to operate, simple process and low cost is managed, and the operation cycle is shorter;The residual stress that grinding and heat treatment generate can obtain Effectively control, to inhibit the generation of roller surface crackle.
And it is further, in step (2), heat treatment includes:When spheroidizing, quenching, ice-cold processing, tempering, first time Effect processing;The first time ageing treatment is that temperature is heated to 130 DEG C ± 10 DEG C after being put into idler wheel in oil oven, keeps the temperature 12~15h, so Idler wheel cooling is taken out afterwards.
In step (3), when semifinishing, grinding depth is 0.01~0.02mm, 1000~1500r/min of speed of grinding wheel, Grinding wheel 350mm, it is 60~70L/min that grinding fluid, which is just injected machined surface and grinding flow quantity, before grinding.
In step (4), second of ageing treatment enters back into step (5) after repeating twice, wherein each equal all over ageing treatment For temperature is heated to 130 DEG C ± 10 DEG C after being put into idler wheel in oil oven, keeps the temperature 12~15h, then takes out idler wheel cooling.
In step (5), when finishing, grinding depth is 0.005~0.01mm, 1000~1500r/min of speed of grinding wheel, sand φ 350mm are taken turns, grinding fluid is just injected into machined surface before grinding and grinding flow quantity is more than 60~70L/min.
Further include step (6) after step (5):Traful processing is carried out to emery wheel.
Description of the drawings
Fig. 1 is the process flow chart of the present invention.
Specific implementation mode
Shown in Fig. 1, and by taking the processing of diesel engine hardened steel GCr15 idler wheels as an example, at present invention process It manages to introduce a preferred embodiment of the invention.
Step 1:It is same as the prior art, i.e., blank is carried out rough turn;
Step 2:Heat treatment, detailed process includes spheroidizing → quenching → ice-cold processing → tempering → ageing treatment;
Step 3:Half fine grinding, grinding wheel characteristics PA60K6V, No. 10 machine oil that grinding fluid is 85% are added 15% The sulfide fat oil of EP agent containing element sulphur, grinding depth 0.015mm, grinding wheel turn degree 1500r/min, grinding wheel φ Grinding fluid is injected machined surface, flow 60L/min by 350mm, speed of grinding wheel 27.5m/s, work speed 30m/s before grinding;
Step 4:Ageing treatment is put into idler wheel heat preservation 13h, takes out idler wheel and be placed in sky by temperature oil-furnace heating to 130 DEG C It is cooling in gas;As shown in fig. 1, second of ageing treatment enters back into step (5) after repeating twice, wherein each all over ageing treatment Be after being put into idler wheel in oil oven temperature be heated to 130 DEG C ± 10 DEG C, keep the temperature 12~15h, then take out idler wheel cooling.
Step 5:Fine grinding, grinding wheel characteristics PA60K6V, No. 10 machine oil addition 15% that grinding fluid is 85% contain The sulfide fat oil of the EP agent of element sulphur, grinding depth 0.005mm, speed of grinding wheel 1500r/min, grinding wheel φ Grinding fluid is just injected machined surface, flow 60L/ by 350mm, speed of grinding wheel 27.5m/s, work speed 30m/s before grinding min;
Step 6:It is same as the prior art, carry out Traful processing.Traful processing is impregnation, first uses acidity Solution impregnates, after using the surface of corrosion add molybdenum disulfide.Molybdenum disulfide plays lubricating action wherein.
In conjunction with above-mentioned technological process, it can be seen that the principle of the present invention is:
Since cutting speed when to roller grinding is high, lead to grinding temperature height.V=30~35m/s when plain grinding, High-speed grinding V > 50m/s.Be ground generate 80%~90% incoming workpiece of cutting heat (10%~15% incoming grinding wheel, 1%~ 10% is taken away by abrasive dust), in addition the thermal conductivity of grinding wheel is very poor, a large amount of grinding heat makes workpiece surface temperature increase, instantaneous temperature Up to 800 DEG C~1000 DEG C of degree so that surface generates prodigious residual stress, and it is cracked to eventually lead to roller surface.
Timeliness is artificial method, and what usually heating or ice-cold processing were eliminated or reduced after quenching in workpiece microcosmic answers Power, machining stress are prevented from deforming and be cracked.Stabilizing tissue does not reduce material with stabilizer elements shape and size Hardness.Its method is:By workpiece heat to certain temperature, (5-20 hours) furnace cooling after long-time heat preservation, or in air It is cooling.
The Grinding Process of original technique is divided into half fine grinding work and fine grinding by the present invention, and half refining stage is to ensure to process Efficiency, using common machined parameters;Refining stage is to ensure machining accuracy, and the smaller machined parameters of use reduce grinding temperature Degree.Ageing treatment is added in centre, and by the timeliness release residual stress that idler wheel generates in half lapping process, stable dimensions subtract Small cracked probability.
The benefit of the present invention:
Special equipment is not needed, can be carried out in common oil oven;Ageing treatment is easy to operate, simple process and low cost, and Operation cycle is shorter;The residual stress that grinding and heat treatment generate can be effectively controlled, to inhibit roller surface crackle Generation.
In addition, there are many concrete methods of realizing and approach of the present invention, the above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, can also do Go out several improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.What is be not known in the present embodiment is each The available prior art of component part is realized.

Claims (2)

1. a kind of process preventing idler wheel delayed crack, which is characterized in that include the following steps:
(1), it is rough turn;
(2), heat treatment, wherein including first time ageing treatment in heat treatment;Step(2)In, heat treatment includes:Nodularization is moved back Fire, quenching, ice-cold processing, tempering, first time ageing treatment;The first time ageing treatment is that temperature adds after being put into idler wheel in oil oven Heat keeps the temperature 12~15h to 130 DEG C ± 10 DEG C, then takes out idler wheel cooling;
(3), half fine grinding, and grinding fluid is just injected into machined surface before the grinding of half fine grinding;Step(3)In, semifinishing When, grinding depth is 0.01~0.02mm, and 1000~1500r/min of speed of grinding wheel, grinding wheel φ 350mm will just be ground before grinding It is 60~70L/min to cut liquid injection machined surface and grinding flow quantity;
(4), second of ageing treatment;Wherein ageing treatment carries out in oil oven, is put into idler wheel, and setting is kept the temperature after idler wheel is heated Soaking time, then take out idler wheel cooling;Step(4)In, second of ageing treatment enters back into step after repeating twice(5), It is wherein each all over ageing treatment be after being put into idler wheel in oil oven temperature be heated to 130 DEG C ± 10 DEG C, keep the temperature 12~15h, so Idler wheel cooling is taken out afterwards;
(5), fine grinding, grinding fluid is just injected into machined surface before the grinding of fine grinding;Step(5)In, when finishing, grinding is deep Degree is 0.005~0.01mm, and 1000~1500r/min of speed of grinding wheel, grinding wheel φ 350mm just inject grinding fluid before grinding Machined surface and 60~70L/min of grinding flow quantity.
2. the process according to claim 1 for preventing idler wheel delayed crack, it is characterised in that:Step(5)After, It further include step(6):Traful processing is carried out to idler wheel, Traful processing is impregnation, is first impregnated with acid solution, after Add molybdenum disulfide using the surface of corrosion.
CN201610184541.3A 2016-03-28 2016-03-28 A kind of process preventing idler wheel delayed crack Active CN105834670B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109483331A (en) * 2018-11-12 2019-03-19 重庆羿业气门有限公司 A kind of integrated processing technology for metal works
CN111411202B (en) * 2020-04-29 2022-02-15 南京威孚金宁有限公司 Machining process for increasing surface compressive stress depth of roller

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11226614A (en) * 1998-02-16 1999-08-24 Sumitomo Metal Ind Ltd Method for improving service life of mandrel bar for manufacturing hot seamless steel tube
CN1695880A (en) * 2005-05-12 2005-11-16 包建忠 Method for manufacturing drum shaped roller
CN102152081A (en) * 2011-04-27 2011-08-17 常州市武进长江滚针轴承有限公司 Manufacture method of vehicle rocker arm bearing
CN103233101A (en) * 2013-04-08 2013-08-07 浙江吉利汽车研究院有限公司杭州分公司 GCr15 bearing steel heat treatment method
CN104057255A (en) * 2014-06-26 2014-09-24 无锡市崇安区科技创业服务中心 Manufacturing process of GCr15 steel precision bearing ring
CN104493447A (en) * 2014-12-26 2015-04-08 贵州虹祥轴承有限公司 Processing technology of connecting rod shaft

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11226614A (en) * 1998-02-16 1999-08-24 Sumitomo Metal Ind Ltd Method for improving service life of mandrel bar for manufacturing hot seamless steel tube
CN1695880A (en) * 2005-05-12 2005-11-16 包建忠 Method for manufacturing drum shaped roller
CN102152081A (en) * 2011-04-27 2011-08-17 常州市武进长江滚针轴承有限公司 Manufacture method of vehicle rocker arm bearing
CN103233101A (en) * 2013-04-08 2013-08-07 浙江吉利汽车研究院有限公司杭州分公司 GCr15 bearing steel heat treatment method
CN104057255A (en) * 2014-06-26 2014-09-24 无锡市崇安区科技创业服务中心 Manufacturing process of GCr15 steel precision bearing ring
CN104493447A (en) * 2014-12-26 2015-04-08 贵州虹祥轴承有限公司 Processing technology of connecting rod shaft

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