CN103695607A - Integral quenching method of overlong and superhard high-wear-resistant alloy tool steel guide rail - Google Patents
Integral quenching method of overlong and superhard high-wear-resistant alloy tool steel guide rail Download PDFInfo
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- CN103695607A CN103695607A CN201410004620.2A CN201410004620A CN103695607A CN 103695607 A CN103695607 A CN 103695607A CN 201410004620 A CN201410004620 A CN 201410004620A CN 103695607 A CN103695607 A CN 103695607A
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- 238000010791 quenching Methods 0.000 title claims abstract description 45
- 230000000171 quenching effect Effects 0.000 title claims abstract description 38
- 229910001315 Tool steel Inorganic materials 0.000 title claims abstract description 24
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 24
- 239000000956 alloy Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 19
- 238000005496 tempering Methods 0.000 claims abstract description 10
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 8
- 230000009466 transformation Effects 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000009499 grossing Methods 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 7
- 238000003801 milling Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- 210000000080 chela (arthropods) Anatomy 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000000227 grinding Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 230000003245 working effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The invention discloses an integral quenching method of an overlong and superhard high-wear-resistant alloy tool steel guide rail. The integral quenching method comprises the following steps: (1) processing alloy tool steel before quenching; (2) quenching, wherein the preheating temperature is kept at 800-850 DEG C, the heating temperature is kept at 950-1200 DEG C, the heat is preserved for 15-50min, air with room temperature is used as the quenching medium, and the quenching temperature is controlled within +/-1 DEG C; (3) straightening: taking out a workpiece to carry out straightening operation when the workpiece is integrally quenched and cooled to 220+/-5 DEG C before martensite transformation, and controlling the length at +/-0.20/1000mm; (4) tempering, wherein the furnace temperature is controlled at 500-580 DEG C; (5) roughly and finely grinding the shape of the workpiece and deburring; (6) straightening, wherein the length is controlled at +/-0.20/1000mm; and (7) secondarily tempering, wherein the furnace temperature is controlled at 500-580 DEG C. The guide rail produced by using the process disclosed by the invention overcomes defects of easiness to wear, multiple seams and low precision of a guide rail manufactured by using the traditional process.
Description
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Technical field
The present invention relates to the processing method that guide rail quenches, relate in particular to a kind of integral quenching method that is used in the superhard high-wear-resistant alloy tool steel of the overlength guide rail on large-size pipeline.
Background technology
The guide rail using in the large-scale production line of automobile industry at present, the common steel alloy that generally all adopts quenched and tempered steel or height, medium frequency induction hardening process to harden.The hardness value of quenched and tempered steel guide rail is generally HRC25 ° of left and right, and adopts the hardness of the common steel alloy guide rail high, medium frequency induction hardening process is hardened to be also no more than HRC50 °.Because the workplatform load on streamline guide rail is heavy, back and forth frequent, so the guide rail that prior art is produced all exists following defect:
1. hardness is high or rigidity layer is thin, and easy to wear, guide rail is short work-ing life.Though quenched and tempered steel guide rail integral quenching, the not high very easily wearing and tearing of hardness.Although guide rail hardness high, that medium frequency quenching is hardened is relatively high, is subject to the restriction of technique, rigidity layer only has the thickness of surface 1 ~ 2mm, and deep mixed, thereby work-ing life is also shorter.
2. the absolute length overwhelming majority of every section of guide rail is 1 ~ 2 meter, has many guide rail seams on tens meters of long streamlines, thereby affects the precision that streamline is produced, and produces noise also larger.As the notification number Chinese patent application that is CN 102864286 provides a kind of integral quenching guide rail of GCr15 material, its extreme length is only also 2500 mm.
Summary of the invention
In order to overcome the above-mentioned defect of prior art, the invention provides a kind of integral quenching method that is used in the overlength superhard alloy tool steel guide rail on large-size pipeline, the length of the finished parts of its production is 4500mm, hardness can, up to HRC62 °, have been avoided the guide rail seam easy to wear, many of traditional technology manufacture, the shortcoming of low precision.
Technical scheme of the present invention is specially: the integral quenching method of the superhard high-wear-resistant alloy tool steel of a kind of overlength guide rail, comprises following processing step:
(1) high-wear-resistant alloy tool steel is processed before quenching;
(2) quench, 800 ° ~ 850 ° C of preheating temperature, Heating temperature is 950 ° ~ 1200 ° C, insulation 15 ~ 50min, the air that quenchant is room temperature, in be controlled at ± 1 ° of C of the temperature of quenchant;
(3) smoothing of workpiece is straight, in whole workpiece quench cooled, to 220 ° of C ± 5 before martensitic transformation, during ° C, takes out workpiece and implements the straight operation of smoothing, be controlled at ± 0.20/1000mm of length direction;
(4) tempering, Control for Kiln Temperature is at 500 ° of-580 ° of C;
(5) slightly refine workpiece profile, deburring;
(6) smoothing of workpiece is straight, be controlled at ± 0.20/1000mm of length direction;
(7) double tempering, Control for Kiln Temperature is at 500 ° of-580 ° of C;
Tempering has following effect: 1. improve structure stability, make workpiece that structural transformation in use no longer occur, thereby workpiece dimension and property retention are stablized; 2. eliminate internal stress, to improve the use properties of workpiece and stablize workpiece dimension; 3. adjust the mechanical property of iron and steel to meet service requirements.Repeatedly tempering, eliminates stress to greatest extent in order to avoid in use procedure, produces distortion.
The guide way hardness of this explained hereafter is higher, the correction of workpiece can only be taken out implementation and operation under 220 ° of C left and right lesser tempss before integral quenching is cooled to martensitic transformation, now, material is in austenitic state, plasticity is better, it is too high that workpiece goes out quench media temperature, and material may be transformed into non-martensite microstructure, and operational condition is also poor; It is low that workpiece goes out medium temperature, and material has been transformed into hard and crisp martensite, timing easy fracture.In quenching process during hot alignment, because stabilization of austenite has occurred material, for guaranteeing that martensitic transformation fully carries out, obtain high rigidity, this process using method for air-cooling.
Preferably, fixture adopts overlength point to contact isothermal quenching fixture during quenching.Overlength point contact isothermal quenching fixture, becomes some contact condition with workpiece is whole, guarantees that work-piece cools is even.
Preferably, in mass, C is that 1.20-1.80%, Cr are that 0.90-1.40%, V are that 0.20-0.1.0%, Mo are that 0.50-1.0%, S are that <0.030, P are <0.030 to the chemical composition of described high-wear-resistant alloy tool steel.
Preferably, high-wear-resistant alloy tool steel is processed and is comprised the following steps before quenching:
(1) blanking, deburring;
(2) smoothing is straight, be controlled at ± 0.20/1000mm of length direction;
(3) milling workpiece profile, is machined to required thickness and width;
(4) workpiece smoothing is straight, be controlled at ± 0.20/1000mm of length direction;
(5) slightly refine workpiece profile, be controlled at ± 0.1mm of thickness error, be controlled at ± 0.1mm of width, deburring;
(6) workpiece smoothing is straight, be controlled at ± 0.20/1000mm of length direction;
(7) pincers bed, line boring, tapping or CNC drilling and tapping, pitch-row≤0.05mm.
Preferably, adopt the long electric furnace nitrogen filled protection of high temperature heated parts during quenching.The long electric furnace nitrogen filled protection heating of high temperature, makes the whole thermally equivalent of super long workpiece, reduces Decarburized layer.
Preferably, the long electric furnace of described high temperature adopts automatic temperature measurement instrument, be controlled at ± 1 ° of C of the furnace temperature temperature difference.
The invention has the beneficial effects as follows:
One, the superhard high-wear-resistant alloy tool steel of the overlength of explained hereafter of the present invention guide rail, absolute length can reach 4500mm, and good rigidly, can reduce the seam quantity on whole streamline, thereby reduced the trueness error and the noise that because of seam, cause, use advantage in the large-scale production line of automobile industry is more obvious.
Two, the superhard high-wear-resistant alloy tool steel of the overlength of explained hereafter of the present invention guide rail, its maximum hardness value can be up to HRC62 °, and hardness allowance control is in HRC ± 1 °, with sheet hardness tolerance≤HRC ± 1 °, overcome the shortcoming that the inhomogeneous grade of hardness value on the low and length direction of conventional guide rails hardness value has a strong impact on work-ing life, can extend 2 to 3 times of guide rail work-ing lifes.
Three, the superhard high-wear-resistant alloy tool steel of the overlength of explained hereafter of the present invention guide rail, owing to being integral quenching, so the hardness error on the whole cross section of guide rail is only HRC ± 1 °, overcome guide rail surface quenched case high, that medium frequency induction hardening process is produced shallow and cause guide rail short shortcoming in work-ing life, can extend 2 to 3 times of guide rail work-ing lifes.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
Embodiment
What in the present embodiment, adopt is that high-wear-resistant alloy tool steel is produced large-size pipeline guide rail.The integral quenching method of the superhard high-wear-resistant alloy tool steel of overlength guide rail, comprises following processing step:
1. by processing requirement blanking, deburring;
2. smoothing is straight; By be controlled at ± 0.20/1000mm of processing requirement length direction;
3. milling (plane) profile; By processing requirement gauge control, at 1.0 mm, width is controlled at 1.0mm;
4. smoothing is straight; By be controlled at ± 0.20/1000mm of processing requirement length direction;
Thick fine grinding profile, by processing requirement gauge control in ± 0.1mm, be controlled at ± 0.1mm of width, deburring;
6. smoothing is straight; By be controlled at ± 0.20/1000mm of processing requirement length direction
7. pincers bed, rules and holes, tapping or CNC drilling and tapping, pitch-row≤0.05mm;
8. quench; adopt the long electric furnace nitrogen filled protection of high temperature heated parts; make the whole thermally equivalent of super long workpiece; reduce Decarburized layer, the long electric furnace of described high temperature adopts automatic temperature measurement instrument, be controlled at ± 1 ° of C of the furnace temperature temperature difference; by processing requirement Heating temperature, be 950 ° ~ 1200 ° C; insulation 15 ~ 50min, the air that quenchant is room temperature, during quenching, fixture adopts overlength point contact isothermal quenching fixture.Overlength point contact isothermal quenching fixture, becomes some contact condition with workpiece is whole, guarantees that work-piece cools is even;
9. smoothing is straight, in whole workpiece quench cooled, to 220 ° of C ± 5 before martensitic transformation, during ° C, takes out workpiece and implements the straight operation of smoothing, by be controlled at ± 0.20/1000mm of processing requirement length direction;
10. tempering; Press processing requirement Control for Kiln Temperature at 500 ° ~ 580 ° C;
11. thick fine grinding profiles, by processing requirement gauge control in ± 0.1mm, be controlled at ± 0.1mm of width, deburring;
12. smoothings are straight, by be controlled at ± 0.20/1000mm of processing requirement length direction;
13. double temperings, by processing requirement Control for Kiln Temperature at 500 ° ~ 580 ° C;
14. fine grinding profiles are to size, by processing requirement gauge control in ± 0.05mm, be controlled at ± 0.05mm of width, deburring;
15. smoothings are straight, by be controlled at ± 0.20/1000mm of processing requirement length direction;
16. line cuttings or finish-milling two are to size, by be controlled at ± 0.10mm of processing requirement length direction;
17. times tappings, deburring;
18. inspection after constructions;
19. oil, packing.
Enforcement of the present invention is not limited to described embodiment, and those skilled in the art make the change of unsubstantiality, all falls into protection scope of the present invention.
Claims (5)
1. an integral quenching method for the superhard high-wear-resistant alloy tool steel of overlength guide rail, is characterized in that comprising following processing step:
(1) high-wear-resistant alloy tool steel is processed before quenching;
(2) quench, 800 ° ~ 850 ° C of preheating temperature, Heating temperature is 950 ° ~ 1200 ° C, insulation 15 ~ 50min, the air that quenchant is room temperature, in be controlled at ± 1 ° of C of the temperature of quenchant;
(3) smoothing of workpiece is straight, in whole workpiece quench cooled, to 220 ° of C ± 5 before martensitic transformation, during ° C, takes out workpiece and implements the straight operation of smoothing, be controlled at ± 0.20/1000mm of length direction;
(4) tempering, Control for Kiln Temperature is at 500 ° of-580 ° of C;
(5) slightly refine workpiece profile, deburring;
(6) smoothing of workpiece is straight, be controlled at ± 0.20/1000mm of length direction;
(7) double tempering, Control for Kiln Temperature is at 500 ° of-580 ° of C;
The integral quenching method of the superhard high-wear-resistant alloy tool steel of overlength according to claim 1 guide rail, is characterized in that: during quenching, fixture adopts overlength point contact isothermal quenching fixture.
2. the integral quenching method of the superhard high-wear-resistant alloy tool steel of overlength according to claim 1 guide rail, is characterized in that, high-wear-resistant alloy tool steel is processed and comprised the following steps before quenching:
(1) blanking, deburring;
(2) smoothing is straight, be controlled at ± 0.20/1000mm of length direction;
(3) milling workpiece profile, is machined to required thickness and width;
(4) workpiece smoothing is straight, be controlled at ± 0.20/1000mm of length direction;
(5) slightly refine workpiece profile, be controlled at ± 0.1mm of thickness error, be controlled at ± 0.1mm of width, deburring;
(6) workpiece smoothing is straight, be controlled at ± 0.20/1000mm of length direction;
(7) pincers bed, line boring, tapping or CNC drilling and tapping, pitch-row≤0.05mm.
3. according to the integral quenching method of the arbitrary described superhard high-wear-resistant alloy tool steel of the overlength guide rail of claim 1-3, it is characterized in that: in mass, C is that 1.20-1.80%, Cr are that 0.90-1.40%, V are that 0.20-0.1.0%, Mo are that 0.50-1.0%, S are that <0.030, P are <0.030 to the chemical composition of described high-wear-resistant alloy tool steel.
4. the integral quenching method of the superhard high-wear-resistant alloy tool steel of overlength according to claim 1 guide rail, is characterized in that: during quenching, adopt the long electric furnace nitrogen filled protection of high temperature heated parts.
5. the integral quenching method of the superhard high-wear-resistant alloy tool steel of overlength according to claim 5 guide rail, is characterized in that: the long electric furnace of described high temperature adopts automatic temperature measurement instrument, be controlled at ± 1 ° of C of the furnace temperature temperature difference.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410004620.2A CN103695607B (en) | 2014-01-06 | 2014-01-06 | The integral quenching method of overlength superhard high-wear-resistant alloy tool steel guide rail |
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| CN201410004620.2A CN103695607B (en) | 2014-01-06 | 2014-01-06 | The integral quenching method of overlength superhard high-wear-resistant alloy tool steel guide rail |
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| CN103695607A true CN103695607A (en) | 2014-04-02 |
| CN103695607B CN103695607B (en) | 2016-01-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108728627A (en) * | 2018-05-30 | 2018-11-02 | 沈阳海克机床有限公司 | A kind of steel guide rail salt bath furnace integral quenching cold and hot working technique of 9Mn2CrV materials |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4531953A (en) * | 1983-06-21 | 1985-07-30 | Calgon Corporation | Sublimation of amine compounds on activated carbon pore surfaces |
| CN101463417A (en) * | 2008-12-11 | 2009-06-24 | 天水星火机床有限责任公司 | Heat treatment method for strip steel inlaid guide rail |
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- 2014-01-06 CN CN201410004620.2A patent/CN103695607B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4531953A (en) * | 1983-06-21 | 1985-07-30 | Calgon Corporation | Sublimation of amine compounds on activated carbon pore surfaces |
| CN101463417A (en) * | 2008-12-11 | 2009-06-24 | 天水星火机床有限责任公司 | Heat treatment method for strip steel inlaid guide rail |
Non-Patent Citations (2)
| Title |
|---|
| 吴元徽: "W18Cr4V拉刀的热处理方法探讨", 《热加工工艺》, vol. 38, no. 12, 31 December 2009 (2009-12-31) * |
| 邵继红等: "多棱角不对称形状镶钢导轨的热处理工艺实验", 《金属世界》, no. 6, 31 December 2006 (2006-12-31) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108728627A (en) * | 2018-05-30 | 2018-11-02 | 沈阳海克机床有限公司 | A kind of steel guide rail salt bath furnace integral quenching cold and hot working technique of 9Mn2CrV materials |
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