CN104419883A - Method for intensifying plasma beam on surface of combustion chamber of aluminum piston of internal combustion engine - Google Patents
Method for intensifying plasma beam on surface of combustion chamber of aluminum piston of internal combustion engine Download PDFInfo
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- CN104419883A CN104419883A CN201310405519.3A CN201310405519A CN104419883A CN 104419883 A CN104419883 A CN 104419883A CN 201310405519 A CN201310405519 A CN 201310405519A CN 104419883 A CN104419883 A CN 104419883A
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- piston
- plasma
- remelting
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- combustion chamber
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Welding Or Cutting Using Electron Beams (AREA)
Abstract
The invention relates to a method for intensifying plasma beams on the surface of a combustion chamber of an aluminum piston of an internal combustion engine. The method is technically characterized by comprising the following steps: performing remelting intensification treatment on positions to be treated on the surface of the combustion chamber of a roughly processed piston blank by using plasma beams and naturally cooling in air after remelting; and finely processing the piston after the remelting intensification treatment, thereby obtaining a finished product, wherein the depth of a remolten layer is 3-8mm and the granular size of primary silicon phase and intermetallic phase of the remolten layer is 1/4-1/10 of that of an unmolten part of a substrate. By adopting the method, generation and diffusion of micro cracks at aluminum silicon phase boundary in the surface tissue of the combustion chamber of the aluminum alloy piston can be delayed, so that the thermal fatigue resistance of the combustion surface of the piston is improved by about 3-8 times, and the service life of the piston is greatly prolonged.
Description
Technical field
The invention belongs to beam-plasma manufacture field, relate to face, a kind of aluminium piston of IC engine combustion chamber beam-plasma enhanced processing method.
Background technology
Along with the raising of power of IC engine, the working conditions of oil engine aluminium-alloy piston is further harsh, and high mechanical load and thermal load usually cause the fault such as piston-top surface scaling loss and the hot tearing of combustion chamber throat edge.
Current aluminium piston of IC engine generally adopts forging type to produce, and because speed of cooling in process of setting is comparatively slow, there is larger block primary silicon tissue and the Eutectic Silicon in Al-Si Cast Alloys tissue in shaft-like distribution in piston tissue.Bear in alternation heat engine loading at piston, because the thermal expansivity of Silicified breccias differs about 8 times, in piston tissue α-Al phase, will the difference of thermal expansion amount be produced between thick primary silicon phase and shaft-like eutectic silicon.When piston expanded by heating, produce the tensile stress perpendicular to interface at aluminium silicon phase interface place, otherwise then produce stress.Under the effect of repeated stress, first viscous deformation occurs at aluminium silicon phase interface place, once viscous deformation accumulation reaches threshold value, and will at aluminium silicon phase interface place germinating micro-crack.Along with micro-crack is constantly expanded, finally cause piston combustion bowl face thermal fatigue failure.
Chinese patent CN 102268670A discloses " a kind of enhanced processing method of combustion chamber throat of aluminum alloy piston of internal combustion engine " and adopts tungsten argon arc soldering method to carry out re melting process to piston combustion chamber throat place, in remelted layer, the size of primary silicon phase and intermetallic phase is refined as 1/4 ~ 1/10 of matrix non-remelting partial particulate size, the hardness of remelted layer is compared the non-remelting region of matrix and is improved about 50%, and the heat engine fatigue strength after piston remelting improves 2 ~ 5 times.
Beam-plasma is the energy-beam of a kind of high temperature, high ionization degree and high-energy-density, is widely used in the fields such as welding, cutting at present.Adopt beam-plasma to carry out remelting compared with tungsten inert-gas arc remelting to metallic surface, have surface heating rates fast, molten bath setting rate is fast, organizes more tiny, reflow process energy utilization efficiency and working efficiency advantages of higher in molten bath.
Summary of the invention
The object of the invention is germinating in order to slow down aluminium silicon phase interface place micro-crack in aluminium-alloy piston and diffusion thus the thermal fatigue life and overcoming in Chinese patent 102268670A improving aluminium-alloy piston utilizes tungsten inert-gas arc remelting to strengthen remelting after coagulation speed that piston combustion chamber throat exists is slow, the problem of reflow process capacity usage ratio and inefficiency and only throat region, overheavy firing room, and the one proposed utilizes beam-plasma to carry out remelting hardening treatment process to face, combustion motor aluminium-alloy piston combustion chamber.
Object of the present invention realizes by following technical proposals:
A kind of face, aluminium piston of IC engine combustion chamber beam-plasma enhanced processing method, is characterized in that carrying out according to the following steps:
(1) pre-treatment: cleaning pretreatment is carried out to the piston blank that roughing completes, then isothermal holding 0.5 ~ 1 hour under 100 ° of C ~ 200 ° C, the moisture of removing piston face, (2) beam-plasma re melting process: adopt beam-plasma to carry out re melting process to piston combustion bowl face, as shown in Figure 1, the beam spot diameter, of beam-plasma is 3mm ~ 6mm, the distance in beam-plasma and piston combustion face remains on 1mm ~ 6mm, during process, beam-plasma is aimed at piston combustion face, beam-plasma rifle head can need arbitrarily the position of strengthening to carry out remelting hardening process to piston combustion bowl face according to the track while scan of program setting, in treating processes, piston keeps rotating always, rotating speed controls at 0.5rpm ~ 2rpm, the power of beam-plasma controls at 2Kw ~ 5Kw, ionized gas flow 3L/min-10L/min, shield gas flow rate 3L/min-10L/min is to obtain the required remelted layer degree of depth, naturally cooling in atmosphere after remelting, (3) precision work after remelting: the piston of re melting process is carried out precision work and obtain finished product, the degree of depth of remelted layer is 3mm-8mm.The primary silicon phase of remelted layer and the particle size of intermetallic phase are the 1/4-1/10 of the particle size at the non-remelting position of matrix.
Beneficial effect: by the process of beam-plasma remelting hardening, make the grain refining of aluminium-alloy piston combustion chamber textura epidermoidea, in remelted layer, the particle size of primary silicon phase and intermetallic compound is refined as the 1/4-1/10 of the particle size at the non-remelting position of matrix, thus slow down germinating and the diffusion of aluminium silicon phase interface place micro-crack in remelted layer, the thermal fatigue property of final raising piston combustion bowl, summary about 3 ~ 8 times, improves the work-ing life of piston greatly.
Accompanying drawing explanation
Fig. 1 is piston combustion bowl beam-plasma re melting process process schematic.
Fig. 2 is the plan structure schematic diagram after the remelting of piston combustion bowl face.
Fig. 3 is the plan structure schematic diagram after the remelting of piston combustion chamber throat region.
Shown in figure: 1, beam-plasma rifle head, 2, beam-plasma, 3, piston body, 4, beam-plasma rifle head motion scan track, 5, piston combustion bowl face, 6, piston combustion chamber throat region.
Embodiment
The invention will be further described by reference to the accompanying drawings:
Example 1: face, a kind of aluminium piston of IC engine combustion chamber beam-plasma enhanced processing method, concrete steps are: (1) pre-treatment: carry out cleaning pretreatment to the piston blank that roughing completes, then isothermal holding 0.5 hour under 150 ° of C, the moisture of removing piston face, (2) beam-plasma re melting process: adopt beam-plasma to carry out re melting process to piston combustion bowl face, process position as shown in Figure 2, the beam spot diameter, of beam-plasma is 4mm, the distance in beam-plasma and piston combustion face remains on 4mm, during process, beam-plasma is aimed at piston combustion face, beam-plasma rifle head carries out remelting hardening process according to the track while scan of program setting to all positions, piston combustion bowl face, in treating processes, piston keeps rotating always, rotating speed controls at 1rpm, the power of beam-plasma controls at 3Kw, ionized gas flow 6L/min, shield gas flow rate 6L/min is to obtain the required remelted layer degree of depth, naturally cooling in atmosphere after remelting, (3) precision work after remelting: the piston of re melting process is carried out precision work and obtain finished product, the degree of depth of remelted layer is 5mm, and the primary silicon phase of remelted layer and the particle size of intermetallic phase are the 1/4-1/10 of the particle size at the non-remelting position of matrix.
Example 2: face, a kind of aluminium piston of IC engine combustion chamber beam-plasma enhanced processing method, concrete steps are: (1) pre-treatment: carry out cleaning pretreatment to the piston blank that roughing completes, then isothermal holding 0.5 hour under 150 ° of C, the moisture of removing piston face, (2 beam-plasma re melting process: adopt beam-plasma to carry out re melting process to piston combustion chamber throat region, process position as shown in Figure 3, during process, beam-plasma rifle head is kept motionless, beam-plasma aims at piston combustion chamber throat region, the beam spot diameter, of beam-plasma is 4mm, the distance in beam-plasma and piston combustion chamber throat region remains on 3mm, in treating processes, piston keeps rotating always, rotating speed controls at 0.5rpm, the power of beam-plasma controls at 4.5Kw, ionized gas flow 6L/min, shield gas flow rate 6L/min is to obtain the required remelted layer degree of depth, naturally cooling in atmosphere after remelting, (3) precision work after remelting: the piston of re melting process is carried out precision work and obtain finished product, the degree of depth of remelted layer is 5mm, and the primary silicon phase of remelted layer and the particle size of intermetallic phase are the 1/4-1/10 of the particle size at the non-remelting position of matrix.
Claims (1)
1. face, an aluminium piston of IC engine combustion chamber beam-plasma enhanced processing method, is characterized in that carrying out according to the following steps:
(1) pre-treatment: cleaning pretreatment is carried out to the piston blank that roughing completes, then isothermal holding 0.5 ~ 1 hour under 100 ° of C ~ 200 ° C, the moisture of removing piston face;
(2) beam-plasma re melting process: adopt beam-plasma to carry out re melting process to piston combustion bowl face, as shown in Figure 1, the beam spot diameter, of beam-plasma is 3mm ~ 6mm, the distance in beam-plasma and piston combustion face remains on 1mm ~ 6mm, during process, beam-plasma is aimed at piston combustion face, beam-plasma rifle head can need arbitrarily the position of strengthening to carry out remelting hardening process to piston combustion bowl face according to the track while scan of program setting, in treating processes, piston keeps rotating always, rotating speed controls at 0.5rpm ~ 2rpm, the power of beam-plasma controls at 2Kw ~ 5Kw, ionized gas flow 3L/min-10L/min, shield gas flow rate 3L/min-10L/min is to obtain the required remelted layer degree of depth, naturally cooling in atmosphere after remelting,
(3) precision work after remelting: the piston of re melting process is carried out precision work and obtain finished product, the degree of depth of remelted layer is 3mm-8mm, and the primary silicon phase of remelted layer and the particle size of intermetallic phase are the 1/4-1/10 of the particle size at the non-remelting position of matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310405519.3A CN104419883A (en) | 2013-09-09 | 2013-09-09 | Method for intensifying plasma beam on surface of combustion chamber of aluminum piston of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310405519.3A CN104419883A (en) | 2013-09-09 | 2013-09-09 | Method for intensifying plasma beam on surface of combustion chamber of aluminum piston of internal combustion engine |
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| Publication Number | Publication Date |
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| CN104419883A true CN104419883A (en) | 2015-03-18 |
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| CN201310405519.3A Pending CN104419883A (en) | 2013-09-09 | 2013-09-09 | Method for intensifying plasma beam on surface of combustion chamber of aluminum piston of internal combustion engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048188A (en) * | 2016-08-18 | 2016-10-26 | 湖南江滨机器（集团）有限责任公司 | Reinforcement treatment method of piston pin hole |
| CN107695615A (en) * | 2017-07-25 | 2018-02-16 | 成都银河动力有限公司 | A kind of technique of reinforcing stimulus piston aditus laryngis |
| CN115821255A (en) * | 2022-12-15 | 2023-03-21 | 湖南江滨机器（集团）有限责任公司 | Remelting copper-clad piston machining method and remelting copper-clad piston |
Citations (6)
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| WO2000049195A1 (en) * | 1999-02-19 | 2000-08-24 | Volkswagen Aktiengesellschaft | Method for machining a component surface |
| US20020025386A1 (en) * | 1999-02-19 | 2002-02-28 | Rolf Heinemann | Method and device for treating a surface of a component |
| CN1438438A (en) * | 2003-02-14 | 2003-08-27 | 华中科技大学 | Method for increasing internal surface wearability of engine cylinder body and cylinder sleeve |
| CN1710140A (en) * | 2005-06-17 | 2005-12-21 | 哈尔滨工业大学 | Method for treating titanium-aluminium base ally by electron beam/heat treatment composite crygtallization |
| CN102268670A (en) * | 2011-07-02 | 2011-12-07 | 东风汽车零部件(集团)有限公司 | Strengthening treatment method for combustion chamber throat of aluminum alloy piston of internal combustion engine |
| CN102717243A (en) * | 2012-06-18 | 2012-10-10 | 上海交通大学 | Technique for strengthening local surface of engine piston |
-
2013
- 2013-09-09 CN CN201310405519.3A patent/CN104419883A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000049195A1 (en) * | 1999-02-19 | 2000-08-24 | Volkswagen Aktiengesellschaft | Method for machining a component surface |
| US20020025386A1 (en) * | 1999-02-19 | 2002-02-28 | Rolf Heinemann | Method and device for treating a surface of a component |
| CN1438438A (en) * | 2003-02-14 | 2003-08-27 | 华中科技大学 | Method for increasing internal surface wearability of engine cylinder body and cylinder sleeve |
| CN1710140A (en) * | 2005-06-17 | 2005-12-21 | 哈尔滨工业大学 | Method for treating titanium-aluminium base ally by electron beam/heat treatment composite crygtallization |
| CN102268670A (en) * | 2011-07-02 | 2011-12-07 | 东风汽车零部件(集团)有限公司 | Strengthening treatment method for combustion chamber throat of aluminum alloy piston of internal combustion engine |
| CN102717243A (en) * | 2012-06-18 | 2012-10-10 | 上海交通大学 | Technique for strengthening local surface of engine piston |
Non-Patent Citations (1)
| Title |
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| 崔洪芝等: "AZ91D镁合金等离子束重熔组织与性能", 《中国有色金属学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048188A (en) * | 2016-08-18 | 2016-10-26 | 湖南江滨机器（集团）有限责任公司 | Reinforcement treatment method of piston pin hole |
| CN107695615A (en) * | 2017-07-25 | 2018-02-16 | 成都银河动力有限公司 | A kind of technique of reinforcing stimulus piston aditus laryngis |
| CN115821255A (en) * | 2022-12-15 | 2023-03-21 | 湖南江滨机器（集团）有限责任公司 | Remelting copper-clad piston machining method and remelting copper-clad piston |
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Application publication date: 20150318 |