CN106702392A - QT-600 nodular cast iron connection arm and steering wheel processing technology - Google Patents
QT-600 nodular cast iron connection arm and steering wheel processing technology Download PDFInfo
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- CN106702392A CN106702392A CN201510413103.5A CN201510413103A CN106702392A CN 106702392 A CN106702392 A CN 106702392A CN 201510413103 A CN201510413103 A CN 201510413103A CN 106702392 A CN106702392 A CN 106702392A
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Abstract
The invention discloses a QT-600 nodular cast iron connection arm and steering wheel processing technology successively comprising the steps: destressing annealing treatment of a casting piece; rough machining; normalizing treatment; finish machining; workpiece overall surface nitriding compound treatment; laser quenching treatment of circular bead parts of a workpiece; deformation detection; and 0.1 mm finish machining polishing adjustment. The technology improves the product stability and repeatability; the product is firstly overall nitrided, the circular bead positions are subjected to laser quenching treatment, the surface of the casting piece obtains high hardness, at the same time, the original hardness and smoothness of cast iron and reliable quality are ensured, the internal stress in the casting piece is eliminated, the gradually cracking tendency of the circular bead parts of the product is reduced, the hardness value of a laser quenched area of a connection arm and a steering seat is improved, and the contradiction between the hardness and the machining precision is solved, and due to not many laser quenching treatment parts, almost no distortion of the casting piece after laser quenching exists.
Description
Technical field
It is more particularly to a kind of the present invention relates to a kind of Technology for Heating Processing of black cast iron part
The link arm of QT-600 spheroidal graphite cast-iron and steering wheel processing technology.
Background technology
Machine components make relatively wide using spheroidal graphite cast-iron, and they are necessarily hard in surface requirements
While spending, also require to keep the original hardness of matrix and toughness.Due to cast iron into
Point, the inhomogeneities of tissue, its internal stress is larger, and deformation is irregular to follow,
Even if carrying out temper.Quality be also it is uneven, at present, QT-600 spheroidal graphites
The link arm of cast iron is processed with steering wheel using conventional Technology for Heating Processing, often
Because product heat treatment hardness is high, it is difficult to machine, cause processing difficulties, processing essence
Degree is low, and heat treatment hardness is low, and product, easy cracking damage, if smart can be caused again
It is heat-treated again after machining, solves processing difficulties, the low problem of hardness, but
Product causes overall deformation serious due to surface treatment, cannot still use, and pass
After the Technology for Heating Processing of system is processed spheroidal graphite cast-iron, interiors of products still exists interior
Stress, often leads to easy cracking damage at product fillet, and product quality stability is poor,
Traditional Technology for Heating Processing can be polluted to environment.
The content of the invention
It is not enough in order to make up the above, the invention provides a kind of link arm of spheroidal graphite cast-iron
With steering wheel processing technology, the link arm of the spheroidal graphite cast-iron and steering wheel processing technology,
It is easily guaranteed that workpiece quality.
The technical scheme that is used to solve its technical problem of the present invention is：It is a kind of
The link arm of QT-600 spheroidal graphite cast-iron and steering wheel processing technology, comprise the following steps that：
Step one：Casting stress relief annealing process；
Step 2：Roughing is carried out according to process stipulation cutting output；
Step 3：To carrying out normalized treatment by rough machined workpiece；
Step 4：The workpiece by normalized treatment is carried out according to process stipulation cutting output
Finishing；
Step 5：Workpiece integral surface Nitriding Compound Treatment after the completion of finishing；
Step 6：The position that there is fillet to workpiece carries out laser quenching treatment；
Step 7：Deflection detection is carried out to workpiece by testing equipment；
Step 8：Finishing polishing to carrying out 0.1mm by the qualified product of detection
Adjustment；
Step 9：Hardness and finish to workpiece are detected.
As a further improvement on the present invention, the laser quenching in step 6 is sharp
Optical energy density is up to 103~105w/cm2, heat time ＜ 1 second, case depth
It is 0.1~1.2mm.
As a further improvement on the present invention, the step 6 laser quenching uses itself
The heat transfer of heat transfer casting matrix center portion is carried out from cooling.
As a further improvement on the present invention, product is quenched by laser in the step 6
Fire treatment obtains martensitic structure.
As a further improvement on the present invention, used in the step 6 " DISAS,
5KW " semiconductor lasers carry out laser quenching.
As a further improvement on the present invention, allowance for finish is in the step 4
+0.2mm。
As a further improvement on the present invention, Nitriding Compound Treatment work in the step 5
In skill, nitrided case depth 0.25mm~0.35mm, hardness 650HV~750HV.
The method have the benefit that：The present invention is in QT-600 football fan's cast iron
Important breakthrough is carried out in heat treatment, traditional heat treatment mode has been abandoned, using partly leading
Body laser realizes nitriding and laser quenching combination process treatment technology, improves product
Stability, repeatability, after the present invention first carries out overall nitriding to product, then to fillet
Position carries out laser quenching treatment, the surface of casting is obtained high rigidity, and protect simultaneously
Demonstrate,prove the original hardness of cast iron and finish, reliable in quality, eliminate QT-600 casting
In internal stress, the gradually tearing tendency of product fillet position is reduced, by above-mentioned work
Skill improves the metallographic structure of linking arm and steering base laser quenching region, the company of improve
The hardness number of arm and the laser quenching region of steering base is connect, and solves hardness with processing
Contradiction between precision, and because the position of laser quenching treatment is few, laser quenching
Several nothings of casting amount of distortion, free from environmental pollution afterwards.
Brief description of the drawings
Fig. 1 carries out payment organization phasor after laser quenching for the present invention.
Specific embodiment
Embodiment:A kind of link arm of QT-600 spheroidal graphite cast-iron processes work with steering wheel
Skill, comprises the following steps that：
Step one：Casting stress relief annealing process, makes cast iron internal stress try one's best elimination；
Step 2：Roughing is carried out according to process stipulation cutting output；
Step 3：To carrying out normalized treatment by rough machined workpiece, at normalizing
Manage to improve matrix strength；
Step 4：The workpiece by normalized treatment is carried out according to process stipulation cutting output
Finishing；
Step 5：Workpiece integral surface Nitriding Compound Treatment after the completion of finishing；
Step 6：The position that there is fillet to workpiece carries out laser quenching treatment；
Step 7：Deflection detection is carried out to workpiece by testing equipment；
Step 8：Finishing polishing to carrying out 0.1mm by the qualified product of detection
Adjustment；
Step 9：Hardness and finish to workpiece are detected.
Laser beam has that monochromaticjty is good, correlation is good, the direction of propagation is good, luminous intensity is high
The characteristics of.In the laser, laser beam is obtained by the optical system lens type of focusing
The hot spot of very little area is obtained, × there is laser power density and energy very high, realize
(power density of usual laser is reachable for non-direct contact mode heated partses
104~105w/cm2, firing rate can make facula area up to (104~105 DEG C/S)
Interior temperature is rapidly reached quenching temperature.After laser is removed, by cast iron
The thermal conduction characteristic of itself, rapidly by this heat after cooling (i.e. from cool down).Adopt
Can further improve with laser quenching new technology × intensity of hardened area and hardness etc.
Mechanical performance index, and the hardness of cast iron matrix can be kept constant with toughness simultaneously.
Using laser quenching new technology, workpiece quenching deformation is small, without hardening media, acyclic
Border pollution, productivity ratio are high, low cost.
By above-mentioned processing technology, link arm and steering to QT-600 spheroidal graphite cast-iron
Disk carries out the combination process treatment of laser quenching+nitriding, in eliminating QT-600 casting
Internal stress, it is to avoid product fillet position cracking, because product needs laser treatment
Position is few, does not result in the secondary deformation of product, improves product stability, weight
Renaturation, so as to solve the contradiction of product hardness and precision, improves the quality of product.
The laser energy density of the laser quenching in step 6 is up to 103~105
W/cm2, heat time ＜ 1 second, case depth are 0.1~1.2mm.
The step 6 laser quenching uses the heat of itself heat transfer casting matrix center portion
Conduction is carried out from cooling.
Product obtains martensitic structure, zero by laser quenching treatment in the step 6
Part surface anti-fatigue performance is significantly improved.
Laser is carried out using " DISAS, 5KW " semiconductor laser in the step 6
Quenching.
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 (7)
1. a kind of link arm of QT-600 spheroidal graphite cast-iron and steering wheel processing technology, it is characterized by：Comprise the following steps that：
Step one：Casting stress relief annealing process；
Step 2：Roughing is carried out according to process stipulation cutting output；
Step 3：To carrying out normalized treatment by rough machined workpiece；
Step 4：The workpiece by normalized treatment is finished according to process stipulation cutting output；
Step 5：Workpiece integral surface Nitriding Compound Treatment after the completion of finishing；
Step 6：The position that there is fillet to workpiece carries out laser quenching treatment；
Step 7：Deflection detection is carried out to workpiece by testing equipment；
Step 8：Finishing to carrying out 0.1mm by the qualified product of detection 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 by：Up to 103~105w/cm2, heat time ＜ 1 second, case depth is 0.1~1.2mm to the laser energy density of the laser quenching in step 6.
3. the link arm of QT-600 spheroidal graphite cast-iron according to claim 1 and steering wheel processing technology, it is characterized by：The step 6 laser quenching is carried out from cooling using the heat transfer of itself heat transfer casting matrix center portion.
4. the link arm of QT-600 spheroidal graphite cast-iron according to claim 1 and steering wheel processing technology, it is characterized by：Product obtains martensitic structure by laser quenching treatment in the 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 by：Laser quenching is carried out using " DISAS, 5KW " semiconductor laser in the step 6.
6. the link arm of QT-600 spheroidal graphite cast-iron according to claim 1 and steering wheel processing technology, it is characterized by：Allowance for finish is+0.2mm in the step 4.
7. the link arm of QT-600 spheroidal graphite cast-iron according to claim 1 and steering wheel processing technology, it is characterized by：In the 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 |
Applications Claiming Priority (1)
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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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| CN106702392B CN106702392B (en) | 2019-11-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115637398A (en) * | 2022-10-10 | 2023-01-24 | 集美大学 | Aluminum alloy hub and surface layer high-energy composite modification method thereof |
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2015
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115637398A (en) * | 2022-10-10 | 2023-01-24 | 集美大学 | Aluminum alloy hub and surface layer high-energy composite modification method thereof |
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