CN104339134A - Technological method for prolonging fatigue life of automobile axle shaft - Google Patents

Technological method for prolonging fatigue life of automobile axle shaft Download PDF

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Publication number
CN104339134A
CN104339134A CN201410562431.7A CN201410562431A CN104339134A CN 104339134 A CN104339134 A CN 104339134A CN 201410562431 A CN201410562431 A CN 201410562431A CN 104339134 A CN104339134 A CN 104339134A
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China
Prior art keywords
axle shaft
automobile axle
spline
automobile
obtains
Prior art date
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Application number
CN201410562431.7A
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Chinese (zh)
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CN104339134B (en
Inventor
王安祥
黄永庆
岳霞
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NANJING DONGHUA DRIVING SHAFT CO Ltd
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NANJING DONGHUA DRIVING SHAFT CO Ltd
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Priority to CN201410562431.7A priority Critical patent/CN104339134B/en
Publication of CN104339134A publication Critical patent/CN104339134A/en
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Publication of CN104339134B publication Critical patent/CN104339134B/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/14Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60BVEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12Torque-transmitting axles
    • B60B35/14Torque-transmitting axles composite or split, e.g. half- axles; Couplings between axle parts or sections

Abstract

The invention provides a technological method for prolonging the fatigue life of an automobile axle shaft. The technological method comprises the following steps: 1) forging; 2) blank quenching and tempering treatment; 3) lathe machining; 4) spline milling, to be specific, increasing the tooth root fillet of a spline from R0.25 mm to R0.45 mm; 5) medium-frequency hardening; 6) tempering; 7) cold treatment, to be specific, performing heat preservation for 50 hours in an incubator at minus 20-minus 30 DEG C; 8) facing and connection hole drilling. The technological method can overcome the defect that more stress is concentrated at a spline in the conventional automobile axle shaft machining technological method. Meanwhile, the cold treatment procedure is added to enhance the strength of the spline part and prolong the torsional fatigue life of the axle shaft.

Description

A kind of process improving automobile axle shaft fatigue life
Technical field
The present invention relates to a kind of automobile axle shaft processing method, particularly a kind of process improving automobile axle shaft fatigue life.
Background technology
The torsional fatigue life of automobile axle shaft is the crucial performance index of of automobile axle shaft, and carries out the torsional fatigue life of the raising automobile axle shaft that quenching heat treatment can be larger to semiaxis.Existing automobile axle shaft process for machining: blank modifier treatment → Vehicle Processing → spline milling machine → mid frequency induction hardening → 2 hour tempering → face work and brill connecting hole.After such process, Formation of Axle Shaft Spline place stress is more concentrated, and spline position intensity is not enough, and often cannot reach customer requirement when carrying out torsional fatigue test, easily rupture in spline position.
Summary of the invention
For the deficiencies in the prior art part, the object of the present invention is to provide a kind of process improving automobile axle shaft fatigue life, the shortcoming that existing automobile axle shaft processing technology spline place stress is comparatively concentrated can be overcome, improve the torsional fatigue performance of automobile axle shaft.
For achieving the above object, the technical solution used in the present invention is:
A kind of process improving automobile axle shaft fatigue life of the present invention, comprises the following steps:
1) forge: bar forging is processed to form automobile half-shaft blank;
2) blank modifier treatment: by step 1) automobile half-shaft blank that obtains carries out modifier treatment, and modulation process parameter is: hardening heat is 840 ~ 860 DEG C, and hardening media is oil cooling; Temperature is 600 ~ 640 DEG C, and tempering insulation time is 1 hour, and cooling medium is air;
3) Vehicle Processing: using step 2) the two ends centre bore of automobile half-shaft blank that obtains as positioning datum, carry out cylindrical turning processing, obtain automobile axle shaft;
4) spline milling machine: to step 3) automobile axle shaft that obtains carries out spline milling machine processing, and spline root fillet is R0.25mm, and by reconditioning spling hob, strengthen spline root fillet, spline root fillet is increased to R0.45mm by R0.25mm;
5) mid frequency induction hardening: application EFD intermediate-frequency quenching machine tool and with the inductor of magnetic conductor to step 4) the impewdance matching district of automobile axle shaft that obtains carries out mid-frequency induction hardening, medium frequency induction hardening process parameter: quenching translational speed is 350mm/min, hardening heat is 800 ~ 900 DEG C, quenching liquid solubility is 3% ~ 5%, quench fluid temperature is 10 ~ 40 DEG C, quenching liquid pH value is 7.5 ~ 9.5, and quenching liquid emitted dose is 100L/min;
6) tempering: by step 5) automobile axle shaft that obtains puts into tempering furnace and carries out lonneal, and temperature is 200 DEG C, and temperature retention time is 6 hours;
7) cold treatment: by step 6) automobile axle shaft that obtains puts in the incubator of-20 DEG C ~-30 DEG C, is incubated 50 hours;
8) face work and bore connecting hole: with step 7) the automobile axle shaft two ends centre bore that obtains is benchmark, turning large end face, and bore 8 connecting holes.
Compared with prior art, the beneficial effect that the present invention has is:
A kind of process improving automobile axle shaft fatigue life of the present invention, by improving spline milling machine operation and tempering process in prior art, overcome the shortcoming that existing automobile axle shaft processing technology spline place stress is comparatively concentrated, and increase cold treatment operation, enhance the intensity at spline position, improve torsional fatigue performance and the product quality of automobile axle shaft, reduce the three guarantees expense cost after sale of automobile axle shaft simultaneously.
Accompanying drawing explanation
Fig. 1 is automobile axle shaft schematic diagram of the present invention.
Fig. 2 is automobile axle shaft spline schematic diagram of the present invention.
In figure: 1, impewdance matching district, 2, spline, 21, spline tooth root, 3, large end face, 4, connecting hole.
Detailed description of the invention
Embodiment:
A kind of process improving automobile axle shaft fatigue life of the present invention, step is as follows:
First bar forging is processed to form automobile half-shaft blank.Then automobile half-shaft blank is carried out modifier treatment, quenching and tempering hardness HB229 ~ 269, concrete modulation process parameter is: hardening heat is 840 ~ 860 DEG C, and hardening media is oil cooling; Temperature is 600 ~ 640 DEG C, and tempering insulation time is 1 hour, and cooling medium is air.Using the two ends centre bore of the automobile half-shaft blank after modulation as positioning datum, carry out cylindrical turning processing according to dimensional requirement, obtain automobile axle shaft.Carry out spline 2 Milling Machining to automobile axle shaft, spline tooth root 21 fillet is R0.25mm, and by reconditioning spling hob, strengthens spline tooth root 21 fillet, make spline tooth root 21 fillet be increased to R0.45mm by R0.25mm, and the stress reducing spline tooth root 21 is concentrated.Apply EFD intermediate-frequency quenching machine tool and carry out mid-frequency induction hardening with the impewdance matching district 1 of inductor to automobile axle shaft of magnetic conductor, medium frequency induction hardening process parameter: quenching translational speed is 350mm/min, hardening heat is 800 ~ 900 DEG C, quenching liquid solubility is 3% ~ 5%, quench fluid temperature is 10 ~ 40 DEG C, and quenching liquid pH value is 7.5 ~ 9.5, and quenching liquid emitted dose is 100L/min, after mid-frequency induction hardening, the inductive layer degree of depth is 6.5mm ~ 8.5mm, case hardness >=HRC50.Automobile axle shaft is put into tempering furnace and carry out lonneal, temperature is 200 DEG C, and temperature retention time is 6 hours.Automobile axle shaft is put in the incubator of-20 DEG C ~-30 DEG C, be incubated 50 hours, by such cold treatment, lower quenching stress, crystal grain thinning, improve intensity, and improve the stability of automobile axle shaft.Finally, be benchmark by automobile axle shaft two ends centre bore, turning large end face 3, and bore 8 connecting holes 4.
Adopt moment of torsion (+415.3,4153) test parameters of Nm, frequency 3Hz carries out torsional fatigue test, the product that the automobile axle shaft product that the present invention manufactures is produced compared with prior art, the torsional fatigue life of semiaxis can rise to more than 300,000 times by 10 ~ 150,000 times.

Claims (1)

1. improve the process of automobile axle shaft fatigue life, it is characterized in that comprising the following steps:
1) forge: bar forging is processed to form automobile half-shaft blank;
2) blank modifier treatment: by step 1) automobile half-shaft blank that obtains carries out modifier treatment, and modulation process parameter is: hardening heat is 840 ~ 860 DEG C, and hardening media is oil cooling; Temperature is 600 ~ 640 DEG C, and tempering insulation time is 1 hour, and cooling medium is air;
3) Vehicle Processing: using step 2) the two ends centre bore of automobile half-shaft blank that obtains as positioning datum, carry out cylindrical turning processing, obtain automobile axle shaft;
4) spline milling machine: to step 3) automobile axle shaft that obtains carries out spline (2) Milling Machining, spline tooth root (21) fillet is R0.25mm, and by reconditioning spling hob, strengthen spline tooth root (21) fillet, spline tooth root (21) fillet is increased to R0.45mm by R0.25mm;
5) mid frequency induction hardening: application EFD intermediate-frequency quenching machine tool and with the inductor of magnetic conductor to step 4) the impewdance matching district (1) of automobile axle shaft that obtains carries out mid-frequency induction hardening, medium frequency induction hardening process parameter: quenching translational speed is 350mm/min, hardening heat is 800 ~ 900 DEG C, quenching liquid solubility is 3% ~ 5%, quench fluid temperature is 10 ~ 40 DEG C, quenching liquid pH value is 7.5 ~ 9.5, and quenching liquid emitted dose is 100L/min;
6) tempering: by step 5) automobile axle shaft that obtains puts into tempering furnace and carries out lonneal, and temperature is 200 DEG C, and temperature retention time is 6 hours;
7) cold treatment: by step 6) automobile axle shaft that obtains puts in the incubator of-20 DEG C ~-30 DEG C, is incubated 50 hours;
8) face work and bore connecting hole: with step 7) the automobile axle shaft two ends centre bore that obtains is benchmark, turning large end face (3), and bore 8 connecting holes (4).
CN201410562431.7A 2014-10-20 2014-10-20 Technological method for prolonging fatigue life of automobile axle shaft Active CN104339134B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410562431.7A CN104339134B (en) 2014-10-20 2014-10-20 Technological method for prolonging fatigue life of automobile axle shaft

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Application Number Priority Date Filing Date Title
CN201410562431.7A CN104339134B (en) 2014-10-20 2014-10-20 Technological method for prolonging fatigue life of automobile axle shaft

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CN104339134B CN104339134B (en) 2017-02-08

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018076390A1 (en) * 2016-10-24 2018-05-03 韩传怀 Wear-resistant noise-reduction automobile half shaft
CN110153654A (en) * 2019-05-24 2019-08-23 重庆荆江汽车半轴股份有限公司 Large modulus high rigidity automobile axle shaft spline processing technology
CN110666467A (en) * 2019-11-26 2020-01-10 抚州申铃汽车配件有限责任公司 Machining process of automobile front axle inner half shaft

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1252291C (en) * 2003-03-04 2006-04-19 中国重型汽车集团有限公司 Technological method for raising toughness and hardening layer depth of heavy truck axle shaft
CN202319733U (en) * 2011-11-23 2012-07-11 十堰园钧工贸有限公司 Spline half axle forged blank for heavy truck
CN102672436B (en) * 2012-05-28 2014-09-10 大永精机(福州)有限公司 Manufacturing process of automobile half shaft
CN104014988A (en) * 2014-05-20 2014-09-03 常州市道铖传动科技有限公司 Grooving technology for flange half shaft

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018076390A1 (en) * 2016-10-24 2018-05-03 韩传怀 Wear-resistant noise-reduction automobile half shaft
CN110153654A (en) * 2019-05-24 2019-08-23 重庆荆江汽车半轴股份有限公司 Large modulus high rigidity automobile axle shaft spline processing technology
CN110666467A (en) * 2019-11-26 2020-01-10 抚州申铃汽车配件有限责任公司 Machining process of automobile front axle inner half shaft
CN110666467B (en) * 2019-11-26 2021-06-29 抚州申铃汽车配件有限责任公司 Machining process of automobile front axle inner half shaft

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