CN101787427B - Crankshaft fillet quenching method - Google Patents
Crankshaft fillet quenching method Download PDFInfo
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- CN101787427B CN101787427B CN2010101010958A CN201010101095A CN101787427B CN 101787427 B CN101787427 B CN 101787427B CN 2010101010958 A CN2010101010958 A CN 2010101010958A CN 201010101095 A CN201010101095 A CN 201010101095A CN 101787427 B CN101787427 B CN 101787427B
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Abstract
The invention provides a crankshaft fillet quenching method. According to the method, a TQK-1A crankshaft quenching machine tool is adopted; 200KW transistor solid (IGBT) mid-frequency induction power source is used as a heating power source; the crank inside-outside power regulation difference is 20 to 40 percent; a quenching sequence is from 4 linkage to 3 linkage to 2 linkage to 5 linkage to 6linkage to 1 linkage to 4 spindle to 3 spindle to 2 spindle to 5 spindle to 6 spindle to 7 spindle to 1 spindle; the concentration of a quenching medium is between 8 and 10 percent, and the quenching temperature is between 15 and 28 DEG C; and tempering treatment is performed at 210 DEG C for 2 hours after quenching. A depth detection method for crankshaft fillet quenching layers performs detection by a hardness method according to a gradient of 0.5 millimeter. By adopting control sensor gap matching, linkage variable power amplitude, position regulation, process parameter optimization and other measures, the method ensures even temperature fields of sides, fillets and shaft necks in the heating process and obtains the homogeneous reasonable shape of hardened layers so as to meet requirements of P11C crankshaft fillet quenching and control the jump amount after crankshaft quenching.
Description
Technical field
The present invention relates to automobile making, specifically is the fillet quenching method of automobile engine crankshaft.
Background technology
Bent axle is the strength member in the engine, and its main damage type is the wearing and tearing of repeated stress failure and axle journal, and therefore, the target that improves the bent axle use properties improves its fatigue strength and wear resistance exactly.Adopting crankshaft fillet induction quenching reinforcing process, can significantly improve fatigue strength, is to improve engine output, prolong the bent axle effective way in work-ing life.In today of various heat treatment technicss and surface strengthening technology tremendous development, the fillet induction quenching is strengthened the intensifying technology that remains present bent axle (particularly high-power engine or engine with supercharger bent axle) first-selection.
The fillet quenching method existing problems of existing automobile engine crankshaft: 1, depth of hardening detects, controls and mainly adopts metallographic method to carry out, sampling is detected the not too strict of position regulation, thus not ideal to the hardness gradient and the control of hardened layer homogeneity at each position of bent axle; 2,, thereby after quenching, exist certain proportion to be out of shape overproof bent axle owing to the control method imperfection.
Summary of the invention
The invention provides a kind of crankshaft fillet quenching method, obtaining evenly reasonably hardened layer shape, and the jerk value behind the control crankshaft quench.
The method that the present invention also provides a kind of crankshaft fillet quenching layer depth to detect.
In order to solve the problem that prior art exists, realize above-mentioned purpose, the problem of the present invention is directed to is improved: 1, detect by the 0.5mm gradient with hardness method, sampling, detection position are explicitly called for, by taking to control inductor block gap coupling, connecting rod change power magnitude and measures such as position adjustments, process parameter optimizing, it is even that assurance adds the temperature field of pining for side, fillet and each one of axle journal, obtains evenly reasonably hardened layer shape.2, by analyzing deformation rule, design, become research and the control aspect several such as power control, process parameter optimizing in proper order in quenching, the jerk value behind the crankshaft quench is controlled fully.
Crankshaft fillet quenching method of the present invention, adopt TQK-1A crankshaft quench lathe, heating power supply is 200Kw transistor solid-state (IGBT) medium frequency induction power supply, outside power regulation difference is 20～40% in the crank throw, quenching be in proper order 4 connect → 3 connect → 2 connect → 5 connect → 6 connect → 1 connect → 4 main → 3 main → 2 main → 5 main → 6 main → 7 main → 1 main, quenchant concentration 8-10%, temperature 15-28 ℃, carry out 210 ℃, 2 hours temper after the quenching.
Crankshaft quench processing parameter such as following table:
| The axle journal numbering | Voltage (V) | Electric current (A) | Heat-up time (S) | Off time (S) | Cooling time (S) |
| 1 main shaft | 420-400 | 285-265 | 22-24 | ?0 | ?18-20 |
| 7 main shafts | 410-390 | 290-270 | 20-22 | ?0 | ?18-20 |
| All the other main shafts | 420-400 | 285-265 | 19-21 | ?0 | ?18-20 |
| Connecting rod | 400-360 | 325-265 | 18.5-20.7 | ?0 | ?18-20 |
The method that crankshaft fillet quenching layer depth of the present invention detects is to detect by the 0.5mm gradient with hardness method.
Description of drawings
Fig. 1 is sampling, detection position synoptic diagram;
Fig. 2 is different axle journal quenching strain direction distribution plans;
Fig. 3 is the process stipulation figure that the deflection of crankshaft jerk value is not more than 0.5mm after quenching.
Embodiment
The P11C bent axle is that Shanghai Hino introduces Japanese Hino engine project, and the needs that should domesticize are born the Development and Production of P11C bent axle by my company.Because it is high that Hino requires production quality control, it is bigger therefore it to be carried out fillet induction quenching intensive treatment difficulty, and the quenching technology key in application has two aspects: the one, obtain the ideal zone of quenching; The 2nd, the distortion of control crankshaft quench.
Product has than strict regulation quenching hardness, the degree of depth: surface hardness Hv520-680 (apart from surperficial 0.1mm position); Effectively more than the hardened layer Hv400; Depth of hardening is axle journal 3.0-6.0mm, R fillet 1.5-4.5mm.Inspection detects by the 0.5mm gradient with hardness method, by Fig. 1 sampling, detection position is explicitly called for.
By analyzing its deformation rule (Fig. 2), control: 1, design the hard surfacing order of each axle journal, its distortion is checked and balance from the following aspects; 2, because the crankshaft structure factor, inconsistent along each position heat transfer condition of axle journal circumference, therefore when bent axle carries out the fillet quenching heating, the circumferential direction heating power is become power control, make to be heated evenly and not cause distortion; 3, according to the crankshaft deformation characteristics, the best on position when heating of design bent axle and cooling, proof stress distributes and distortion; 4, optimize processing parameter, reach the optimum matching of main journal and connecting rod neck depth of hardening, distortion is checked and balance.
The P11C crankshaft quench adopts TQK-1A crankshaft quench lathe, and heating power supply is 200Kw transistor solid-state (IGBT) medium frequency induction power supply, and its heating power, power tracking adjusting, machine tool program control etc. all can meet the demands.In actual the quenching, outside power regulation difference is 35% in the crank throw, quenching be in proper order 4 connect → 3 connect → 2 connect → 5 connect → 6 connect → 1 connect → 4 main → 3 main → 2 main → 5 main → 6 main → 7 main → 1 main, 25 ℃ of quenchant concentration 10%, temperature.Be out of shape inspection after the quenching and carry out 210 ℃, 2 hours temper.P11C crankshaft quench technological specification is as follows:
| The axle journal numbering | Voltage (V) | Electric current (A) | Heat-up time (S) | Off time (S) | Cooling time (S) |
| 1 main shaft | ?420 | ?275 | ?24 | ?0 | ?20 |
| 7 main shafts | ?410 | ?280 | ?20 | ?0 | ?20 |
| All the other main shafts | ?420 | ?275 | ?21 | ?0 | ?20 |
| Connecting rod | ?380 | ?300 | ?20.7 | ?0 | ?20 |
The P11C bent axle is after reinforcement of fillet induction quenching and temper, bent axle surface hardness precisely controlled (Hv580), the processing parameter that hardened zone scope, case depth are dissected the cross section reaches design requirements and transition rounding (axle journal degree of depth 5mm fully, R fillet degree of depth 3mm), crooked jerk value 100% behind the induction quenching is qualified, jerk value behind the crankshaft quench is controlled in the 0.5mm fully, is 0.31mm, defectives such as no quenching crack.Take a sample by Fig. 1, detect by the 0.5mm gradient with hardness method, meet the requirements detecting the position.By Stromeyer test, the crankshaft fatigue strength M after induction quenching is strengthened
-1=3980N.m, the bent axle safety coefficient reaches 1.8, has passed through the check of company of Hino.
The present invention is for satisfying above each position hardness gradient and hardened layer uniformity requirement, particularly connecting rod neck I, II, III, IV position hardened layer uniformity requirement, take to control inductor block gap coupling, connecting rod change power magnitude and measures such as position adjustments, process parameter optimizing, it is even to have guaranteed to add the temperature field of pining for side, fillet and each one of axle journal, obtain evenly rational hardened layer shape, thereby satisfied the requirement of P11C crankshaft fillet quenching.
Claims (1)
1. crankshaft fillet quenching method, it is characterized in that: adopt TQK-1A crankshaft quench lathe that the P11C of Shanghai Hino bent axle is quenched, heating power supply is the solid-state medium frequency induction power supply of 200KW transistor, outside power regulation difference is 20～40% in the crank throw, quenching is the 4th connecting rod neck → the 3rd connecting rod neck → the 2nd connecting rod neck → the 5th connecting rod neck → the 6th connecting rod neck → the 1st connecting rod neck → the 4th main journal → the 3rd main journal → the 2nd main journal → the 5th main journal → the 6th main journal → the 7th main journal → the 1st main journal in proper order, quenchant concentration 8-10%, temperature 15-28 ℃, carry out 210 ℃ after the quenching, 2 hours temper; Crankshaft quench processing parameter such as following table:
。
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101010958A CN101787427B (en) | 2010-01-23 | 2010-01-23 | Crankshaft fillet quenching method |
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| CN2010101010958A CN101787427B (en) | 2010-01-23 | 2010-01-23 | Crankshaft fillet quenching method |
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| CN101787427A CN101787427A (en) | 2010-07-28 |
| CN101787427B true CN101787427B (en) | 2011-09-28 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102925655B (en) * | 2012-10-30 | 2014-06-18 | 重庆跃进机械厂有限公司 | Thermal treatment method of cam shaft |
| CN108950146A (en) * | 2018-08-29 | 2018-12-07 | 西安天瑞达光电技术股份有限公司 | It is a kind of can industrial application crankshaft fillet intensifying method |
| CN111876576B (en) * | 2020-08-10 | 2021-04-27 | 湖南人文科技学院 | Manufacturing and strengthening method of lower core connecting rod in compression molding machine |
| CN113969334A (en) * | 2021-10-26 | 2022-01-25 | 山西柴油机工业有限责任公司 | Heat treatment deformation control method for medium-frequency quenching of high-power crankshaft |
| CN114107649B (en) * | 2021-11-22 | 2023-06-02 | 桂林福达曲轴有限公司 | Method for improving runout of crankshaft after fillet quenching |
| CN114517255B (en) * | 2022-01-17 | 2023-08-29 | 桂林福达阿尔芬大型曲轴有限公司 | Medium-frequency induction quenching method for surface of crankshaft of large diesel engine |
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