CN103695607B - The integral quenching method of overlength superhard high-wear-resistant alloy tool steel guide rail - Google Patents
The integral quenching method of overlength superhard high-wear-resistant alloy tool steel guide rail Download PDFInfo
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- CN103695607B CN103695607B CN201410004620.2A CN201410004620A CN103695607B CN 103695607 B CN103695607 B CN 103695607B CN 201410004620 A CN201410004620 A CN 201410004620A CN 103695607 B CN103695607 B CN 103695607B
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- 238000010791 quenching Methods 0.000 title claims abstract description 42
- 230000000171 quenching effect Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910001315 Tool steel Inorganic materials 0.000 title claims abstract description 21
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 20
- 239000000956 alloy Substances 0.000 title claims abstract description 20
- 238000009499 grossing Methods 0.000 claims abstract description 22
- 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
- 238000009413 insulation Methods 0.000 claims abstract description 4
- 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
- 238000003079 width control Methods 0.000 claims description 6
- 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
- 238000005553 drilling Methods 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 238000000227 grinding Methods 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
- 210000000080 chela (arthropods) Anatomy 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 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
- 230000007547 defect Effects 0.000 description 2
- 238000011031 large-scale 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
- 230000003247 decreasing effect Effects 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
- 238000004806 packaging method and process 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
- 210000001138 tear Anatomy 0.000 description 1
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Abstract
An integral quenching method for overlength superhard high-wear-resistant alloy tool steel guide rail, comprises following steps: processing before the quenching of (one) alloy tool steel; (2) quench, preheating temperature 800 DEG C ~ 850 DEG C, Heating temperature is 950 DEG C ~ 1200 DEG C, insulation 15 ~ 50min, and quenchant is the air of room temperature, and temperature controls in ± 1 DEG C; (3) smoothing is straight, when 220 DEG C before whole workpiece quench cooled to martensitic transformation ± 5 DEG C, takes out workpiece and implements the straight operation of smoothing, and length direction controls at ± 0.20/1000mm; (4) tempering, Control for Kiln Temperature is at 500 DEG C ~ 580 DEG C; (5) slightly workpiece configurations is refined, deburring; (6) smoothing is straight, and length direction controls at ± 0.20/1000mm; (7) double tempering, Control for Kiln Temperature is at 500 DEG C ~ 580 DEG C.The guide rail that present invention process is produced overcomes the guide rail seam easy to wear, many of traditional technology manufacture, the shortcoming of low precision.
Description
Technical field
The present invention relates to the processing method of guide rail quenching, particularly relate to the integral quenching method of a kind of overlength be used on large-size pipeline superhard high-wear-resistant alloy tool steel guide rail.
Background technology
The guide rail used in the large-scale production line of automobile industry at present, generally all adopts quenched and tempered steel or height, common alloy steel that medium frequency induction hardening process is hardened.The hardness value of quenched and tempered steel guide rail is generally at about HRC25, and the hardness of the common alloy steel guide rail adopting high, medium frequency induction hardening process to harden also is no more than HRC50.Due to the workplatform load weight on streamline guide rail, back and forth frequently, 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 for work-ing life.Though quenched and tempered steel guide rail integral quenching, hardness is not high very easily weares and teares.Although the guide rail hardness that high, medium frequency quenching is hardened is relatively high, by the restriction of technique, rigidity layer only has the thickness of surface 1 ~ 2mm, and deep mixed, thus work-ing life is also shorter.
2. the absolute length overwhelming majority of every section of guide rail is 1 ~ 2 meter, the streamline of tens meters long has many guide rail seams, thus affects the precision of production line balance, produces noise also larger.As the notification number Chinese invention application that is CN102864286 provides a kind of integral quenching guide rail of GCr15 material, its extreme length is also only 2500mm.
Summary of the invention
In order to overcome the above-mentioned defect of prior art, the invention provides a kind of integral quenching method of the overlength superhard alloy tool steel guide rail be used on large-size pipeline, the length of its finished parts produced is 4500mm, hardness up to HRC62, can avoid 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 a kind of overlength superhard high-wear-resistant alloy tool steel guide rail, comprises following processing step:
(1) processing before the quenching of high-wear-resistant alloy tool steel;
(2) quench, preheating temperature 800 DEG C ~ 850 DEG C, Heating temperature is 950 DEG C ~ 1200 DEG C, insulation 15 ~ 50min, and quenchant is the air of room temperature, and the temperature of quenchant controls in ± 1 DEG C;
(3) smoothing of workpiece is straight, when 220 DEG C before whole workpiece quench cooled to martensitic transformation ± 5 DEG C, takes out workpiece and implements the straight operation of smoothing, and length direction controls at ± 0.20/1000mm;
(4) tempering, Control for Kiln Temperature is at 500 DEG C-580 DEG C;
(5) slightly workpiece configurations is refined, deburring;
(6) smoothing of workpiece is straight, and length direction controls at ± 0.20/1000mm;
(7) double tempering, Control for Kiln Temperature is at 500 DEG C-580 DEG C.
Tempering has following effect: 1. improve structure stability, makes workpiece in use no longer structural transformation occur, thus workpiece dimension and property retention are stablized; 2. internal stress is eliminated, to improve the use properties of workpiece and to stablize workpiece dimension; 3. the mechanical property of iron and steel is adjusted to meet service requirements.Repeatedly tempering, eliminates stress to greatest extent in order to avoid produce distortion in use procedure.
The guide way hardness of this explained hereafter is higher, the correction of workpiece can only take out implementation and operation under 220 ° of about C 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 material there occurs stabilization of austenite, for guaranteeing that martensitic transformation is fully carried out, obtain high rigidity, this technique have employed method for air-cooling.
Preferably, during quenching, fixture adopts overlength point cantact isothermal quenching fixture.Overlength point cantact isothermal quenching fixture, with workpiece whole become point cantact state, ensure work-piece cools even.
Preferably, in mass, C is 1.20-1.80%, Cr be 0.90-1.40%, V be 0.20-0.1.0%, Mo be 0.50-1.0%, S be <0.030, P is <0.030 to the chemical composition of described high-wear-resistant alloy tool steel.
Preferably, before the quenching of high-wear-resistant alloy tool steel, processing comprises the following steps:
(1) blanking, deburring;
(2) smoothing is straight, and length direction controls at ± 0.20/1000mm;
(3) milling workpiece profile, is machined to required thickness and width;
(4) workpiece smoothing is straight, and length direction controls at ± 0.20/1000mm;
(5) slightly refine workpiece configurations, thickness error controls at ± 0.1mm, width control system at ± 0.1mm, deburring;
(6) workpiece smoothing is straight, and length direction controls at ± 0.20/1000mm;
(7) bed is clamped, line boring, tapping or CNC drilling and tapping, pitch-row≤0.05mm.
Preferably, high temperature long electric furnace nitrogen filled protection heated parts is adopted during quenching.The long electric furnace nitrogen filled protection heating of high temperature, makes the overall thermally equivalent of super long workpiece, reduces Decarburized layer.
Preferably, the long electric furnace of described high temperature adopts automatic temperature measurement instrument, and the furnace temperature temperature difference controls at ± 1 DEG C.
The invention has the beneficial effects as follows:
One, the overlength superhard high-wear-resistant alloy tool steel guide rail of present invention process production, absolute length can reach 4500mm, and good rigidly, the seam quantity on whole streamline can be reduced, thus the trueness error decreased because seam causes and noise, in the large-scale production line being used in automobile industry, advantage is more obvious.
Two, the overlength superhard high-wear-resistant alloy tool steel guide rail of present invention process production, its maximum hardness value can up to HRC62, and hardness allowance control is in HRC ± 1, with sheet hardness tolerance≤HRC ± 1, overcome the shortcoming having a strong impact on work-ing life such as uneven of hardness value on the low and length direction of conventional guide rails hardness value, guide rail work-ing life 2 to 3 times can be extended.
Three, the overlength superhard high-wear-resistant alloy tool steel guide rail of present invention process production, owing to being integral quenching, so the hardness error on the whole cross section of guide rail is only HRC ± 1, the shortcoming overcoming height, guide rail surface quenched case that medium frequency induction hardening process is produced is shallow and causes guide rail work-ing life short, can extend guide rail work-ing life 2 to 3 times.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
Embodiment
What adopt in the present embodiment is that high-wear-resistant alloy tool steel is to produce large-size pipeline guide rail.The integral quenching method of overlength superhard high-wear-resistant alloy tool steel guide rail, comprises following processing step:
1. by processing requirement blanking, deburring;
2. smoothing is straight; Control at ± 0.20/1000mm by processing requirement length direction;
3. milling (plane) profile; By processing requirement gauge control at 1.0mm, width control system is at 1.0mm;
4. smoothing is straight; Control at ± 0.20/1000mm by processing requirement length direction;
5. slightly refine profile, by processing requirement gauge control at ± 0.1mm, width control system at ± 0.1mm, deburring;
6. smoothing is straight; Control at ± 0.20/1000mm by processing requirement length direction;
7. clamp bed, line boring, tapping or CNC drilling and tapping, pitch-row≤0.05mm;
8. quench; adopt high temperature long electric furnace nitrogen filled protection heated parts; make the overall thermally equivalent of super long workpiece; reduce Decarburized layer, the long electric furnace of described high temperature adopts automatic temperature measurement instrument, and the furnace temperature temperature difference controls at ± 1 DEG C; it is 950 DEG C ~ 1200 DEG C by processing requirement Heating temperature; insulation 15 ~ 50min, quenchant is the air of room temperature, and during quenching, fixture adopts overlength point cantact isothermal quenching fixture.Overlength point cantact isothermal quenching fixture, with workpiece whole become point cantact state, ensure work-piece cools even;
9. smoothing is straight, when 220 DEG C before whole workpiece quench cooled to martensitic transformation ± 5 DEG C, takes out workpiece and implements the straight operation of smoothing, controls at ± 0.20/1000mm by processing requirement length direction;
10. tempering; By processing requirement Control for Kiln Temperature at 500 DEG C-580 DEG C;
11. slightly refine profile, by processing requirement gauge control at ± 0.1mm, width control system at ± 0.1mm, deburring;
12. smoothings are straight, control at ± 0.20/1000mm by processing requirement length direction;
13. double temperings, by processing requirement Control for Kiln Temperature at 500 DEG C-580 DEG C;
14. fine grinding profiles to size, by processing requirement gauge control at ± 0.05mm, width control system at ± 0.05mm, deburring;
15. smoothings are straight, control at ± 0.20/1000mm by processing requirement length direction;
16. Linear cut or finish-milling two, to size, control at ± 0.10mm by processing requirement length direction;
17. times tappings, deburring;
18. inspection after constructions;
19. oil, packaging.
Enforcement of the present invention is not limited to described embodiment, and those skilled in the art make the change of unsubstantiality, all fall into protection scope of the present invention.
Claims (3)
1. the integral quenching method of an overlength superhard high-wear-resistant alloy tool steel guide rail, it is characterized in that: the longest 4500mm of described tool steel guide rail, maximum hardness value HRC62 after integral quenching technique completes, hardness tolerance is HRC ± 1, with sheet hardness tolerance≤HRC ± 1, integral quenching technique comprises following steps:
(1) processing before the quenching of high-wear-resistant alloy tool steel:
Blanking, deburring;
Smoothing is straight, and length direction controls at ± 0.20/1000mm;
Milling workpiece profile, is machined to required thickness and width;
Workpiece smoothing is straight, and length direction controls at ± 0.20/1000mm;
Thick fine grinding workpiece configurations, thickness error controls at ± 0.1mm, width control system at ± 0.1mm, deburring;
Workpiece smoothing is straight, and length direction controls at ± 0.20/1000mm;
Pincers bed, line boring, tapping or CNC drilling and tapping, pitch-row≤0.05mm;
(2) quench, high temperature long electric furnace nitrogen filled protection heated parts is adopted during quenching, during quenching, fixture adopts overlength point cantact isothermal quenching fixture, preheating temperature 800 DEG C ~ 850 DEG C, Heating temperature is 950 DEG C ~ 1200 DEG C, insulation 15 ~ 50min, quenchant is the air of room temperature, and the temperature of quenchant controls in ± 1 DEG C;
(3) smoothing of workpiece is straight, when 220 DEG C before whole workpiece quench cooled to martensitic transformation ± 5 DEG C, takes out workpiece and implements the straight operation of smoothing, and length direction controls at ± 0.20/1000mm;
(4) tempering, Control for Kiln Temperature is at 500 DEG C-580 DEG C;
(5) slightly workpiece configurations is refined, deburring;
(6) smoothing of workpiece is straight, and length direction controls at ± 0.20/1000mm;
(7) double tempering, Control for Kiln Temperature is at 500 DEG C-580 DEG C.
2. the integral quenching method of overlength according to claim 1 superhard high-wear-resistant alloy tool steel guide rail, it is characterized in that: in mass, C is 1.20-1.80%, Cr be 0.90-1.40%, V be 0.20-0.1.0%, Mo be 0.50-1.0%, S be <0.030, P is <0.030 to the chemical composition of described high-wear-resistant alloy tool steel.
3. the integral quenching method of overlength according to claim 1 superhard high-wear-resistant alloy tool steel guide rail, is characterized in that: the long electric furnace of described high temperature adopts automatic temperature measurement instrument, and the furnace temperature temperature difference controls at ± 1 DEG C.
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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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| 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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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 |
|---|
| W18Cr4V拉刀的热处理方法探讨;吴元徽;《热加工工艺》;20091231;第38卷(第12期);147-148 * |
| 多棱角不对称形状镶钢导轨的热处理工艺实验;邵继红等;《金属世界》;20061231(第6期);36, 38 * |
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