CN106702392B - The link arm and steering wheel processing technology of QT-600 spheroidal graphite cast-iron - Google Patents
The link arm and steering wheel processing technology of QT-600 spheroidal graphite cast-iron Download PDFInfo
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- CN106702392B CN106702392B CN201510413103.5A CN201510413103A CN106702392B CN 106702392 B CN106702392 B CN 106702392B CN 201510413103 A CN201510413103 A CN 201510413103A CN 106702392 B CN106702392 B CN 106702392B
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Abstract
The invention discloses a kind of link arms of QT-600 spheroidal graphite cast-iron and steering wheel processing technology, and step is successively are as follows: casting stress relief annealing process；Roughing；Normalized treatment；Finishing；Workpiece overall surface Nitriding Compound Treatment；To workpiece, there are the positions of fillet to carry out laser quenching processing；Deflection detection；The finishing for carrying out 0.1mm polishes adjustment；The present invention improves product stability, repeatability, after the present invention first carries out whole nitriding to product, laser quenching processing is carried out to fillet position again, the surface of casting is set to obtain high rigidity, it ensure that the original hardness of cast iron and finish, reliable in quality simultaneously again, eliminate internal stress in casting, reduce the gradually tearing tendency of product fillet position, improve the hardness number in the laser quenching region of linking arm and steering base, and solves the contradiction between hardness and machining accuracy, and due to laser quenching processing position it is few, after laser quenching casting amount of distortion there are few.
Description
Technical field
The present invention relates to a kind of heat treatment process of black cast iron part, in particular to a kind of links of QT-600 spheroidal graphite cast-iron
Arm and steering wheel processing technology.
Background technique
Machine components are wider using spheroidal graphite cast-iron production, they also require to keep while surface requirements certain degree of hardness
The original hardness of matrix and toughness.Due to the ingredient of cast iron, the inhomogeneities of tissue, internal stress is larger, and deformation is random
Rule can be followed, even if carrying out tempering.Quality be also it is non-uniform, currently, the link arm and steering wheel of QT-600 spheroidal graphite cast-iron
It is processed using conventional heat treatment process, often due to product heat treatment hardness is high, it is difficult to machine, cause processing tired
Difficulty, machining accuracy is low, and heat treatment hardness is low, and will lead to product, is easy cracking damage, if after the completion of finishing at reheating
Reason solves processing difficulties, the low problem of hardness, but product is caused overall deformation serious, still can not due to surface treatment
It uses, and after traditional heat treatment process handles spheroidal graphite cast-iron, interiors of products still remains internal stress, often leads to produce
Cracking damage is easy at product fillet, stable product quality is poor, and traditional heat treatment process can cause environmental pollution.
Summary of the invention
In order to make up the above deficiency, the present invention provides a kind of link arms of spheroidal graphite cast-iron and steering wheel processing technology, should
The link arm and steering wheel processing technology of spheroidal graphite cast-iron, are easily guaranteed that workpiece quality.
The present invention is to solve technical solution used by its technical problem: a kind of link arm of QT-600 spheroidal graphite cast-iron
With steering wheel processing technology, the specific steps are as follows:
Step 1: casting stress relief annealing process；
Step 2: roughing is carried out according to process stipulation cutting output；
Step 3: normalized treatment is carried out to by rough machined workpiece；
Step 4: the workpiece Jing Guo normalized treatment is finished according to process stipulation cutting output；
Step 5: the workpiece overall surface Nitriding Compound Treatment after the completion of finishing；
Step 6: to workpiece, there are the positions of fillet to carry out laser quenching processing；
Step 7: deflection detection is carried out to workpiece by detection device；
Step 8: the finishing for carrying out 0.1mm to product qualified after testing polishes adjustment；
Step 9: the hardness and finish of workpiece are detected.
As a further improvement of the present invention, the laser energy density of the laser quenching in step 6 up to 103~
105w/cm2, heating time < 1 second, case depth are 0.1~1.2mm.
As a further improvement of the present invention, the step 6 laser quenching is using itself heat transfer casting matrix center portion
Heat transfer is carried out from cooling.
As a further improvement of the present invention, product handles by laser quenching and obtains martensite group in the step 6
It knits.
As a further improvement of the present invention, using " DISAS, 5KW " semiconductor laser are swashed in the step 6
Photoquenching.
As a further improvement of the present invention, allowance for finish is+0.2mm in the step 4.
As a further improvement of the present invention, in the step 5 in Nitriding Compound Treatment technique, nitrided case depth
0.25mm~0.35mm, hardness 650HV~750HV.
The method have the benefit that: the present invention carries out important breakthrough in the heat treatment of QT-600 football fan's cast iron,
Traditional heat treatment mode has been abandoned, nitriding and laser quenching combination process processing technique are realized using semiconductor laser, mentioned
High product stability, repeatability, after the present invention first carries out whole nitriding to product, then to the progress laser quenching of fillet position at
Reason makes the surface of casting obtain high rigidity, and ensure that the original hardness of cast iron and finish simultaneously, reliable in quality, eliminates QT-
Internal stress in 600 casting reduces the gradually tearing tendency of product fillet position, by above-mentioned process improving linking arm and turns
Metallographic structure to seat laser quenching region, improves the hardness number in the laser quenching region of linking arm and steering base, and solves
Contradiction between hardness and machining accuracy, and since the position of laser quenching processing is few, casting amount of distortion after laser quenching
There are few free from environmental pollution.
Detailed description of the invention
Fig. 1 is that the present invention carries out payment organization phasor after laser quenching.
Specific embodiment
Embodiment: a kind of link arm of QT-600 spheroidal graphite cast-iron and steering wheel processing technology, the specific steps are as follows:
Step 1: casting stress relief annealing process eliminates cast iron internal stress as far as possible；
Step 2: roughing is carried out according to process stipulation cutting output；
Step 3: normalized treatment is carried out to by rough machined workpiece, matrix strength is improved by normalized treatment；
Step 4: the workpiece Jing Guo normalized treatment is finished according to process stipulation cutting output；
Step 5: the workpiece overall surface Nitriding Compound Treatment after the completion of finishing；
Step 6: to workpiece, there are the positions of fillet to carry out laser quenching processing；
Step 7: deflection detection is carried out to workpiece by detection device；
Step 8: the finishing for carrying out 0.1mm to product qualified after testing polishes adjustment；
Step 9: the hardness and finish of workpiece are detected.
Laser beam has the characteristics that monochromaticjty is good, correlation is good, the direction of propagation is good, luminous intensity is high.In the laser, laser
Beam obtains the hot spot of very little area by the optical system lens type of focusing, × there is very high laser power density and energy,
Realization non-direct contact mode heats workpiece, and (for the power density of usual laser up to 104~105w/cm2, heating speed is reachable
(104~105 DEG C/S), can make the temperature in facula area be rapidly reached quenching temperature.After laser is removed, by casting
The thermal conduction characteristic of iron itself, rapidly by this heat after cooling (i.e. from cooling).It can be further using laser quenching new technology
The mechanical performance indexs such as raising × hardened area intensity and hardness, and the hardness and toughness that are able to maintain cast iron matrix simultaneously are not
Become.Using laser quenching new technology, workpiece quenching deformation is small, high without hardening media, non-environmental-pollution, productivity, at low cost.
By above-mentioned processing technology, link arm and steering wheel to QT-600 spheroidal graphite cast-iron carry out laser quenching+nitriding
Combination process processing, eliminates the internal stress in QT-600 casting, product fillet position cracking is avoided, since product needs laser
The position of processing is few, not will cause the secondary deformation of product, improves product stability, repeatability, to solve product
The contradiction of hardness and precision improves the quality of product.
The laser energy density of the laser quenching in step 6 is up to 103~105w/cm2, and heating time < 1 second, firmly
Change layer depth is 0.1~1.2mm.
The step 6 laser quenching is carried out using the heat transfer of itself heat transfer casting matrix center portion from cooling.
Product obtains martensitic structure by laser quenching processing in the step 6, and piece surface anti-fatigue performance has bright
It is aobvious to improve.
Using " DISAS, 5KW " semiconductor laser carry out laser quenching in the step 6.
Allowance for finish is+0.2mm in the step 4.
In the step 5 in Nitriding Compound Treatment technique, nitrided case depth 0.25mm~0.35mm, hardness 650HV~
750HV。
Claims (6)
1. a kind of link arm of QT-600 spheroidal graphite cast-iron and steering wheel processing technology, it is characterized in that: specific step is as follows:
Step 1: casting stress relief annealing process；
Step 2: roughing is carried out according to process stipulation cutting output；
Step 3: normalized treatment is carried out to by rough machined workpiece；
Step 4: the workpiece Jing Guo normalized treatment is finished according to process stipulation cutting output；
Step 5: the workpiece overall surface Nitriding Compound Treatment after the completion of finishing；
Step 6: to workpiece, there are the positions of fillet to carry out laser quenching processing, laser energy density up to 103~105w/cm2,
Heating time < 1 second, case depth was 0.1~1.2mm；
Step 7: deflection detection is carried out to workpiece by detection device；
Step 8: the finishing for carrying out 0.1mm to product qualified after testing polishes adjustment.
2. the link arm of QT-600 spheroidal graphite cast-iron according to claim 1 and steering wheel processing technology, it is characterized in that: it is described
Step 6 laser quenching is carried out using the heat transfer of itself heat transfer casting matrix center portion from cooling.
3. the link arm of QT-600 spheroidal graphite cast-iron according to claim 1 and steering wheel processing technology, it is characterized in that: it is described
Product obtains martensitic structure by laser quenching processing in step 6.
4. the link arm of QT-600 spheroidal graphite cast-iron according to claim 1 and steering wheel processing technology, it is characterized in that: it is described
Using " DISAS, 5KW " semiconductor laser carry out laser quenching in step 6.
5. the link arm of QT-600 spheroidal graphite cast-iron according to claim 1 and steering wheel processing technology, it is characterized in that: it is described
Allowance for finish is+0.2mm in step 4.
6. the link arm of QT-600 spheroidal graphite cast-iron according to claim 1 and steering wheel processing technology, it is characterized in that: it is described
In step 5 in Nitriding Compound Treatment technique, nitrided case depth 0.25mm~0.35mm, hardness 650HV~750HV.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510413103.5A CN106702392B (en) | 2015-07-15 | 2015-07-15 | The link arm and steering wheel processing technology of QT-600 spheroidal graphite cast-iron |
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| CN201510413103.5A CN106702392B (en) | 2015-07-15 | 2015-07-15 | The link arm and steering wheel processing technology of QT-600 spheroidal graphite cast-iron |
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| CN106702392A CN106702392A (en) | 2017-05-24 |
| CN106702392B true CN106702392B (en) | 2019-11-29 |
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|---|---|---|---|---|
| US3178279A (en) * | 1961-05-16 | 1965-04-13 | Ishikawajima Harima Heavy Ind | Nitride bearing low-manganese ductile steel |
| CN1379189A (en) * | 2002-04-30 | 2002-11-13 | 东风汽车公司 | Technology for strengthening spherulitic iron crankshaft of engine |
| CN1936309A (en) * | 2006-10-18 | 2007-03-28 | 山东潍柴华丰动力有限公司 | Diesel engine thin-wall cylinder casing and its mfg. method |
| CN101352800A (en) * | 2008-09-10 | 2009-01-28 | 南京高精船用设备有限公司 | Technique for processing oil distribution sleeve in adjustable windstick distributor for marine |
| CN102719829A (en) * | 2012-02-02 | 2012-10-10 | 山东常林机械集团股份有限公司 | Surface hardening malcomising process for ductile cast iron hydraulic part |
| CN104264160A (en) * | 2014-09-04 | 2015-01-07 | 内蒙古北方重工业集团有限公司 | Multiplex heat treatment method for enhancing wear resistance, corrosion resistance, impact resistance and fatigue resistance of quenched and tempered steel surface |
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2015
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3178279A (en) * | 1961-05-16 | 1965-04-13 | Ishikawajima Harima Heavy Ind | Nitride bearing low-manganese ductile steel |
| CN1379189A (en) * | 2002-04-30 | 2002-11-13 | 东风汽车公司 | Technology for strengthening spherulitic iron crankshaft of engine |
| CN1936309A (en) * | 2006-10-18 | 2007-03-28 | 山东潍柴华丰动力有限公司 | Diesel engine thin-wall cylinder casing and its mfg. method |
| CN101352800A (en) * | 2008-09-10 | 2009-01-28 | 南京高精船用设备有限公司 | Technique for processing oil distribution sleeve in adjustable windstick distributor for marine |
| CN102719829A (en) * | 2012-02-02 | 2012-10-10 | 山东常林机械集团股份有限公司 | Surface hardening malcomising process for ductile cast iron hydraulic part |
| CN104264160A (en) * | 2014-09-04 | 2015-01-07 | 内蒙古北方重工业集团有限公司 | Multiplex heat treatment method for enhancing wear resistance, corrosion resistance, impact resistance and fatigue resistance of quenched and tempered steel surface |
Non-Patent Citations (3)
| Title |
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| 球墨铸铁QT60-2激光相变硬化层摩擦磨损特性的研究;朱东明等;《理化检验 物理分册》;19901215(第6期);第3-7、19页 * |
| 球墨铸铁正火+软氮化代替钢制凹模试验;白全元;《贵州机械》;19800930(第3期);第63-64页 * |
| 球铁软氮化后高频淬火复合处理;张平和等;《金属热处理》;19830730(第7期);第12-20页 * |
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