CN100560748C - A kind of compounding method that prolongs the key elements of chain grate life-span - Google Patents
A kind of compounding method that prolongs the key elements of chain grate life-span Download PDFInfo
- Publication number
- CN100560748C CN100560748C CNB2007100234042A CN200710023404A CN100560748C CN 100560748 C CN100560748 C CN 100560748C CN B2007100234042 A CNB2007100234042 A CN B2007100234042A CN 200710023404 A CN200710023404 A CN 200710023404A CN 100560748 C CN100560748 C CN 100560748C
- Authority
- CN
- China
- Prior art keywords
- key elements
- chain grate
- laser
- impact
- prolongs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
A kind of compounding method that prolongs the key elements of chain grate life-span relates to machinofacture and material processing processed and applied technical field, at first surperficial nondestructive testing is carried out at drying grate key component material processing position; The surface imperfection of the drying grate part that goes out at surperficial nondestructive testing, have in the subrange at carry out the molten Combined Processing of salt; When laser-impact is handled; earlier apply pitch-dark coating at workpiece surface; water is cooked protective layer; to the workpiece fatiguability region of fracture particularly region of stress concentration carry out laser-impact and handle; simple and fast of the present invention, efficient height; the production maintenance cost reduction process time is short, and (30min～5h) can realize the serialization operation has guaranteed the high-level efficiency of products production.
Description
Technical field
The present invention relates to machinofacture and material processing processed and applied technical field, refer in particular to a kind of key elements of chain grate compounding method in work-ing life that prolongs, be particularly useful for the surperficial mechanical property modification of the big thickness gradient drying grate of big area key component material.
Background technology
In advanced manufacturing technology, the laser-impact processing technology is as typical case's representative of high energy beam, it is a kind of processing means with good prospect, its principle is that high-energy short-pulse laser inductive shockwave and material interact, the high-pressure shocking wave that utilizes light laser and material effect to be produced improves mechanical property, the especially fatigue lifetime of material.This technology has obtained widespread use in all trades and professions such as mechanical engineering, boats and ships, aviation, microelectronics, this technology is mainly used in material modification, metal shock peening and shaping at present, and aspect such as nondestructive testing.
The molten composite treatment process of " QPQ " salt is the molten surface reinforcement modifying technology of a kind of new metal-salt, and " QPQ " is the abbreviation of English " Quench-Polish-Quench ", means quenching-polishing-quenching.The QPQ technology is the new and high technology in the field of metal surface treatment, can make the raising of the wear resistance of metallic surface and corrosion stability simultaneously than conventional thermal treatment and surface anticorrosion technology tenfold, metal is done compound processing in two kinds of watery fusion salt melts of different nature, make multiple element infiltrate the metallic surface simultaneously earlier and form the compisite seeping layer of forming by several compounds, the modification so that strengthened in the metallic surface, and full technological process is nuisanceless, this treatment technology is compared with the single surface protection technique that improves corrosion stability with the heat treatment technics that improves wear resistance, it can improve the wear resistance and the corrosion stability of metallic surface simultaneously significantly, and single heat treatment technics or surface protection technique are to reach this two requirements simultaneously.
Drying grate from normal temperature to the pyritous environment back and forth during operation work, with normal temperature down the equipment of work require different at design aspect.Bed and the transport sector component operation that moves in circles in the alternating temperature-changing field of combing of drying grate key component is because the effect in temperature field will enough be paid attention to expansion, stress problem when correlated parts is designed.Key components and partss such as the little axle in the drying grate, slide rail are consumable accessorys, and its main failure forms is a wear out failure, and the failure mode of chain link, grate plate, side plate is the heat fatigure failure of shaking.Temperature causes the generation and the variation of thermal stresses and thermal strain in 20～900 ℃ of scopes drastic changeization of having to go to the toilet in its operational process, and every cycle operation one-period, workpiece all stand once to compress and the stretching plastic deformation because of the effect of thermal stresses everywhere.In this chilling and shock heating environment, the inner fine cracks that exists of component, be mingled with, defective such as segregation, under the pulsating stress effect, be easy to develop into crackle.Again to its surface laser impact processing, make these drying grate key component materials have high-wearing feature, corrosion stability, anti-stress corrosion performance, and improved fatigue lifetime greatly the technology of the present invention is handled these drying grate key component materials through QPQ after.
Summary of the invention
The objective of the invention is comprehensively to solve the surperficial mechanical property modification difficult problem of drying grate key component material.A kind of key elements of chain grate compounding method and device in work-ing life of prolonging, utilize QPQ salt bath compounding technology to improve the wear resistance and the erosion resistance on drying grate key component surface, the high amplitude residual compressive stress layer that utilizes laser-impact to produce again, improve the mechanical property of drying grate key component effectively, can increase substantially fatigue lifetime, the anti-stress corrosion performance of material especially.This technology has overcome the shortcoming of single surface treatment method, and is not the simple superposition of two kinds of processing, adopts this composite treatment technology, has realized the compound of key elements of chain grate nitriding operation and oxidation operation; Anti-wear and corrosion stability compound; Heat treatment technics and deepfreeze technology compound.
The invention provides and be used for composite treatment technology and prolong the device in drying grate key component life-span, this device is combined by QPQ device, laser impact intensified device, the cannot-harm-detection device, and the laser reinforcing device is made up of the workplatform of the laser generator control device that links to each other successively, laser generator, multiaxis compound motion.
A kind of compounding method that prolongs the key elements of chain grate life-span is characterized in that:
(1) the present invention carries out surperficial nondestructive testing at drying grate key component material processing position before and after Combined Processing, the nondestructive testing transmitter is by the isolating method test material of error surface signal, the various surface imperfection information such as roughness, hardness, crackle, unevenness that comprise workpiece in the signal, can accurately locate the Combined Processing position like this, and can effectively economize on resources and the energy, significantly reduce production costs;
(2) during the QPQ of the inventive method handles, the surface imperfection of the drying grate part that goes out at surperficial nondestructive testing, have in the subrange at QPQ handle, rather than big area whole part QPQ handles, in QPQ Combined Processing process, come the controlling index of selected temperature, soaking time and composition, the type of cooling that workpiece is come out of the stove according to workpiece material and service condition.For workpiece cross section thickness great disparity, need its preheating, nitrogen carbon or sulphonitrocarburizing, rear oxidation processing, polishing and reoxidation operation under the situations such as dimensional change requirement;
When (3) laser-impact is handled, apply pitch-dark coating at workpiece surface earlier, water is cooked protective layer, to the workpiece fatiguability region of fracture particularly region of stress concentration carry out laser-impact and handle.Under the high pressure effect of laser blast wave, the microplasticity distortion takes place in the metallic surface, forms high amplitude residual compressive stress layer, thereby has improved the mechanical property of metallic substance effectively, can increase substantially fatigue lifetime, the anti-stress corrosion performance of material especially.
The present invention fully combines the characteristics of QPQ technology and laser-impact technology, and QPQ technology can be applicable to the surface reinforcement modifying of the big thickness gradient material of big area, is typical heat treatment technics; And in the laser-impact process time lack (20ns) strain rate height (10 especially
7s
-1), it is high strain rate cold plasticity enhanced deformation technology, be specially adapted to the fatiguability region of fracture of workpiece, region of stress concentration surface reinforcement modifying particularly, the two is combined, it is modified and reinforced to carry out comprehensive comprehensive surface to metallic substance, is the perfect adaptation of metal surface modification heat treatment technics and deepfreeze technology.
The innovation of surface treatment method of the present invention, the most important thing is through after the Combined Processing, drying grate key component top layer forms the high-amplitude residual compressive stress, this residual compressive stress is that part formerly passes through the QPQ art breading, laser-impact and the low temperature unrelieved stress that produces again, and this residual compressive stress can not discharge in follow-up heat treatment process, and conventional QPQ thermal treatment or simple laser-impact processing can make residual compressive stress very fast generation thermal stresses in the following process process in key component top layer discharge, this compounding method is not only the simple superposition of two kinds of surface treatment methods, but the optimization by technology makes that drying grate key component surface stress can the fine drying grate key component top layer that is stabilized in, and this is the characteristics of the inventive method maximum.
This technology not only can be applied to the Combined Processing of the key components and parts of pellet chain combing machines, can also be used for various steel, iron and the iron-based powder metallurgy parts of requirement high abrasion, anti-high erosion, fatiguability, little distortion.It usually is used for replacing thermal treatment and surface strengthening technologies such as carburizing and quenching, high-frequency quenching, ionitriding, tufftride, and, fatigue performance wear-resisting to improve are particularly with solving a hardening deforming difficult problem.Equally, also can be used to surfacecti proteons such as replacement is turned blue, chromium plating, nickel plating,, reduce production costs greatly so that increase substantially the corrosion stability of part.Further promote this technology and can be applied in industries such as automobile, lathe, engineering machinery, agricultural machine, offshore oil exploitation, chemical engineering machinery, textile manufacturing machine, instrument, lathe, ordnance, Mould Machining.
Advantage of the present invention is as follows:
(1) this method generation unrelieved stress belongs to the low temperature unrelieved stress, and dark about about 10 times than mechanic shot peening of the unrelieved stress layer depth that laser-impact forms, its unrelieved stress are difficult for producing thermal stresses and discharge in the pellet chain combing machines operational process.
(2) can satisfy the multiple performance requriements of workpiece: this compounding method can not only be handled the key components and parts surface reinforcement modifying of pellet chain combing machines, and be applicable in other structural part of pellet chain combing machines, improve workpiece wear resistance, antifriction quality, seizure resistance, fatigue resistance and erosion resistance, so improve greatly the fatigue lifetime of workpiece.
(3) distortion of material surface is very little after this Combined Processing, does not influence material heart portion performance.QPQ treatment temp low (520～580 ℃), during the laser-impact metallic surface, because the time compole short (ns magnitude) of laser-impact, workpiece almost is not subjected to heat affecting, its surface temperature is only about 120 ℃, so it mainly is to utilize its high pressure mechanics effect and non-thermal effect that laser-impact is handled, thereby the laser-impact treatment process can be classified as cold machining process.After the Combined Processing indeformable substantially, the outward appearance of workpiece evenly, beautiful, can be used as product and finally handle.
(4) this composite treatment technology simple and fast, efficient height, the production maintenance cost reduction process time is short, and (30min～5h) can realize the serialization operation has guaranteed the high-level efficiency of products production.
(5) this composite treatment technology feature of environmental protection excellence: without any pollution.Avoid adopting melt down, during way of recycling such as smelting to second environmental pollution, be green manufacturing again.
Description of drawings
Fig. 1 composite treatment process schema
Fig. 2 Combined Processing drying grate chain link example
1-laser beam 2-laser-impact device 3-chain link
Embodiment
Embodiment:,, determine the weak district of piece surface mechanical property to determine the Combined Processing position by detected sensor signal at two eddy current sensors of measured workpiece surface mounting earlier to the nondestructive testing of drying grate link surface; The QPQ technical process is: oil removing → preheating (350 ℃) → QPQ nitrogenize (520 ℃) → QPQ oxidation (370 ℃) → polishing → cooling → cleaning.For drying grate material high temperature steel 30Cr21Mn8NiSi2NRe, after the QPQ art breading, surface abrasion resistance reaches 23 times of conventional quenching; After the QPQ art breading, laser-impact laser-impact drying grate chain link improves its thermal fatigue resistance again.As shown in Figure 2 in adopting laser impact intensified process, when laser output wavelength is 1.054 μ m, the pulse width (FWHM) of output laser is 22.1ns, when pulsed laser energy is about 35J, after pulse laser 1 focuses on through optical mirror slip 2, hot spot converges in 3 places, drying grate chain link position, through laser impact intensified (twice laser-impact), again to its surperficial nondestructive testing, detect its mechanics of surface performance, and contrast, find that drying grate chain link thermal fatigue life prolongs greatly with processing is preceding, cycle index during crack initiation is extended to about 35000 times by 15000 times original circulations, thereby has greatly improved fatigue lifetime.Result of study shows, part hardness significantly improves behind this complex intensifying, its surface becomes compressive stress state by residual stress state by tensile stress, show that the highest hardness increase rate is up to 3 times, thereby performances such as its fatigue lifetime and wear resistance are significantly improved, and this is significant to improving the key elements of chain grate performance.
| Reinforcing process | Surface hardness | Surface stress | The crack initiation cycle index | Surface abrasion resistance |
| Common process technology | 630.7Hv | 50MPa | 15000 | |
| Composite treatment process | 1084.4Hv | -189MPa | 35000 |
Claims (3)
1. compounding method that prolongs the key elements of chain grate life-span is characterized in that:
(1) surperficial nondestructive testing is all carried out at key elements of chain grate material processing position;
(2) surface imperfection of the key elements of chain grate that goes out at surperficial nondestructive testing, have in the subrange at carry out QPQ salt bath Combined Processing;
(3) utilize QPQ salt bath Combined Processing to improve the wear resistance and the erosion resistance on key elements of chain grate surface, the high amplitude residual compressive stress layer that utilizes laser-impact to produce again, improve the mechanical property of key elements of chain grate effectively, increase substantially fatigue lifetime, the anti-stress corrosion performance of material;
When (4) laser-impact was handled, earlier in the pitch-dark coating of key elements of chain grate surface-coated, water was cooked protective layer, the key elements of chain grate fatiguability region of fracture is carried out laser-impact handle.
2. a kind of compounding method that prolongs the key elements of chain grate life-span according to claim 1, it is characterized in that: in QPQ salt bath Combined Processing process, the controlling index of coming selected temperature, soaking time, composition according to the material and the service condition of key elements of chain grate and the type of cooling that key elements of chain grate is come out of the stove; Under the situation for key elements of chain grate cross section thickness great disparity or dimensional change requirement, need carry out preheating, nitrogen carbon or sulphonitrocarburizing, rear oxidation processing, polishing and reoxidation operation to it.
3. a kind of compounding method that prolongs the key elements of chain grate life-span according to claim 1 and 2 is characterized in that: when described laser-impact was handled, the described fatiguability region of fracture was specially region of stress concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100234042A CN100560748C (en) | 2007-06-01 | 2007-06-01 | A kind of compounding method that prolongs the key elements of chain grate life-span |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100234042A CN100560748C (en) | 2007-06-01 | 2007-06-01 | A kind of compounding method that prolongs the key elements of chain grate life-span |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101225456A CN101225456A (en) | 2008-07-23 |
| CN100560748C true CN100560748C (en) | 2009-11-18 |
Family
ID=39857661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100234042A Active CN100560748C (en) | 2007-06-01 | 2007-06-01 | A kind of compounding method that prolongs the key elements of chain grate life-span |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100560748C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629227B (en) * | 2009-08-12 | 2012-03-21 | 江苏大学 | Reinforcement method and reinforcement device for improving high-temperature fatigue life of material |
| CN102115865A (en) * | 2010-01-05 | 2011-07-06 | 四川金邦新材料有限公司 | Surface treatment method of powder metallurgy part |
| CN102199769B (en) * | 2011-05-11 | 2013-06-19 | 江苏大学 | Method and apparatus for acquiring nano-coating by utilizing shock waves generated by laser-induced continuous detonation |
| CN102886606B (en) * | 2012-10-16 | 2015-08-26 | 江苏大学 | A kind of method and apparatus of laser remanufacturing sheet metal weldment |
| CN103697186B (en) * | 2013-12-16 | 2016-04-13 | 四川精控阀门制造有限公司 | The cock of pressure balance type oil seal stopcock and cock process of surface treatment |
| CN104043941B (en) * | 2014-06-23 | 2017-02-15 | 河南伟彤科技股份有限公司 | Re-manufacturing machining process of surface of inner hole of hydraulic cylinder scrap guide sleeve |
| CN104109860A (en) * | 2014-07-03 | 2014-10-22 | 西安交通大学 | Multi-laser polishing and reinforcing method for surfaces of additive manufacturing metal parts |
| CN106702314A (en) * | 2016-12-22 | 2017-05-24 | 当涂县宏宇金属炉料有限责任公司 | Nitriding compound-treatment method of stainless steel |
| CN107177817A (en) * | 2017-03-31 | 2017-09-19 | 江苏科技大学 | It is a kind of while improving the handling process of carbon steel corrosion stability and wearability |
| CN114592119A (en) * | 2022-03-14 | 2022-06-07 | 中国航空制造技术研究院 | Laser shock peening method based on prestress |
| CN115094203A (en) * | 2022-06-24 | 2022-09-23 | 浙江中诚滑动轴承科技有限公司 | Preparation method of multiple composite treatment self-lubricating steel bushing and bushing |
-
2007
- 2007-06-01 CN CNB2007100234042A patent/CN100560748C/en active Active
Non-Patent Citations (9)
| Title |
|---|
| QPQ处理工艺及其质量控制. 周鼎华.热处理技术与装备，第27卷第1期. 2006 |
| QPQ处理工艺及其质量控制. 周鼎华.热处理技术与装备，第27卷第1期. 2006 * |
| QPQ技术的现状和展望. 罗德福等.金属热处理，第29卷第1期. 2004 |
| QPQ技术的现状和展望. 罗德福等.金属热处理，第29卷第1期. 2004 * |
| 发动机曲轴的激光冲击复合处理工艺研究. 任旭东等.内燃机工程，第28卷第2期. 2007 |
| 发动机曲轴的激光冲击复合处理工艺研究. 任旭东等.内燃机工程，第28卷第2期. 2007 * |
| 影响激光熔覆层品质的主要因素分析. 吴健.机械制造与自动化，第33卷第4期. 2004 |
| 影响激光熔覆层品质的主要因素分析. 吴健.机械制造与自动化，第33卷第4期. 2004 * |
| 激光淬火和冲击复合强化处理40Cr钢的耐磨性能研究. 花银群等.磨擦学学报，第23卷第5期. 2003 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101225456A (en) | 2008-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100560748C (en) | A kind of compounding method that prolongs the key elements of chain grate life-span | |
| Hawryluk | Review of selected methods of increasing the life of forging tools in hot die forging processes | |
| CN1985019B (en) | Method for producing wear-resistant and fatigue-resistant edge layers from titanium alloys, and correspondingly produced components | |
| Emamverdian et al. | Current failure mechanisms and treatment methods of hot forging tools (dies)-a review | |
| CN105177274A (en) | Laser hardening process | |
| CN101092658A (en) | Method for prolonging service life of key parts and components of production equipment of chain cage machine - rotary kiln ball lumps | |
| CN111945154A (en) | Iron-based alloy powder for laser cladding and laser cladding method | |
| Gao et al. | Microstructure and properties of surfacing layers of dies manufactured by bimetal-gradient-layer surfacing technology before and after service | |
| Klocke et al. | Dry broaching using carbon free steel as tool material | |
| CN101633109B (en) | Method for reproducing high-temperature fatigue damage component | |
| Raghavendra et al. | Wear and material characterization of CuSn10 additively manufactured using directed energy deposition | |
| US6048586A (en) | Process for applying a functional gradient material coating to a component for improved performance | |
| Babu et al. | Material and surface engineering for precisión Forging Dies | |
| Leiro | Microstructure analysis of wear and fatigue in austempered high-Si steels | |
| EP2134879B1 (en) | Method for producing a crankshaft, in particular for diesel engines | |
| Kashani et al. | Improvement of wear resistance of hot working tool steel by hardfacing Part 2–Case study | |
| Doyon et al. | Induction hardening of crankshafts and camshafts | |
| CN101629227B (en) | Reinforcement method and reinforcement device for improving high-temperature fatigue life of material | |
| Farhani et al. | The study of wear resistance of a hot forging die, hardfaced by a cobalt-base superalloy | |
| Burlachenko et al. | Increase of Durability Transmission Mechanism Based on the Laser Processing Improvement | |
| McKimpson | Induction hardening off-road machinery components | |
| CN106567069A (en) | Laser repairing method of hot roll good in laser cladding effect | |
| Grum | Residual stresses and microstructural modifications | |
| CN109837365A (en) | Hot-work die and its composite modified layer and surface modifying method on surface | |
| Cavaliere et al. | Laser Cladding: Fatigue Properties |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 225453 Jiangsu Taixing Hongqiao Town Hongqiao Industrial Park Zhongdan South Road Jiangsu Hongda Special Steel Machinery Factory Co., Ltd. Co-patentee after: JIANGSU University Patentee after: JIANGSU HONGDA SPECIAL STEEL MACHINERY PLANT Co.,Ltd. Address before: 225453 Hongqiao Industrial Park, seven Wei Town, Taixing, Jiangsu Co-patentee before: Jiangsu University Patentee before: Jiangsu Hongda Special Steel Machinery Plant |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180822 Address after: 225453 Jiangsu Taixing Hongqiao Town Hongqiao Industrial Park Zhongdan South Road Jiangsu Hongda Special Steel Machinery Factory Co., Ltd. Patentee after: JIANGSU HONGDA SPECIAL STEEL MACHINERY PLANT Co.,Ltd. Address before: 225453 Jiangsu Taixing Hongqiao Town Hongqiao Industrial Park Zhongdan South Road Jiangsu Hongda Special Steel Machinery Factory Co., Ltd. Co-patentee before: Jiangsu University Patentee before: JIANGSU HONGDA SPECIAL STEEL MACHINERY PLANT Co.,Ltd. |