CN103276181A - Heat treatment process of austempered ductile iron bushing - Google Patents
Heat treatment process of austempered ductile iron bushing Download PDFInfo
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- CN103276181A CN103276181A CN2013102185775A CN201310218577A CN103276181A CN 103276181 A CN103276181 A CN 103276181A CN 2013102185775 A CN2013102185775 A CN 2013102185775A CN 201310218577 A CN201310218577 A CN 201310218577A CN 103276181 A CN103276181 A CN 103276181A
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- bushing
- ductile iron
- austempered ductile
- lining
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Abstract
The invention discloses a heat treatment process of an austempered ductile iron bushing. The heat treatment process of the austempered ductile iron bushing is characterized by comprising the following steps of: 1, casting a bushing by nodular cast iron and machining; 2, heating the bushing to a temperature of 850-950 DEG C in a chamber electric furnace, preserving the heat for 1h; 3, immediately quenching the heated bushing in a nitrate furnace with a temperature of 250-300 DEG C, preserving the heat for 1h; and 4, discharging out of the furnace and cooling with water for about 5min. According to the heat treatment process of the austempered ductile iron bushing, provided by the invention, the manufactured austempered ductile iron bushing has the characteristics of high strength, high hardness, good impaction, high wear resistance and fatigue resistance, and small abrasion; moreover, a matching gap of a pin and the bushing is well controlled, the vibration and noise during running are remarkably smaller than those of other vehicles, and the normal position of a bogie is ensured due to slight lateral oscillation; and the austempered ductile iron bushing is high in radiance and good in corrosion resistance, and has no rhegma during use and overhauling processes.
Description
Technical field
The present invention relates to a kind of thermal treatment process of austempered ductile iron lining, belong to the thermal treatment process technology field.
Background technology
Railway is being born important role in present national economy, train is because it is safe, convenient, quick, obtain traveler than more options.Therefore, comfortableness, the security of train are had higher requirement.The lining of train bogie is the bigger consumable accessory of wear loss, and the quality product quality directly has influence on vehicle driving safety.That uses lining on the old type bogie mostly is steel sleeve greatly, adopts hard-faced heat treatment mode, reaches the such performance requriements of surface hardness HRC45-50, these parts are under arms the time, push cutter with its mating plate and cut formula wearing and tearing and abrasive wear, working conditions is very abominable, and abrasion are serious.Therefore, especially after the rail vehicle speed-raising, because the abrasion of lining are more serious, reflect problems such as vertical vibration is big, rolling serious, abrasion are serious, failure rate rising on the various truck car, this has brought great hidden danger to traffic safety.
Summary of the invention
Purpose: in order to overcome the deficiencies in the prior art, the invention provides a kind of thermal treatment process of austempered ductile iron lining, by austempering ductile iron (Austem-pered Ductile Iron, be called for short shellfish difficult to understand, ADI) lining made of thermal treatment process, have high strength, high rigidity, good advantages such as impact, high-wearing feature and fatigue resistance.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of thermal treatment process of austempered ductile iron lining is characterized in that, may further comprise the steps:
Step (1), cast lining with spheroidal graphite cast iron, carry out mechanical workout;
Step (2), lining is put into chamber type electric resistance furnace be heated to 850～950 ℃, be incubated 1 hour;
Step (3), the lining after will heating are quenched in 250～300 ℃ the nitrate furnace immediately, are incubated 1 hour;
Step (4), the water-cooled of coming out of the stove are about 5 minutes.
Beneficial effect: the thermal treatment process of austempered ductile iron lining provided by the invention, the austempered ductile iron lining of making, have high strength, high rigidity, good impact, high-wearing feature and fatigue resistance, wear away little, controlled the tolerance clearance of pin, cover well, vibration and noise in the operation way are significantly less than other vehicles, and side throw is also very little, has guaranteed the normotopia of bogie; Austempered ductile iron lining luminance brightness height, corrosion resistance is good, uses to open and inspect to find no the rhegma phenomenon.
Description of drawings
Fig. 1 is the cross-sectional view of austempered ductile iron lining of the present invention;
Fig. 2 is the wear resisting property figure of austempered ductile iron lining of the present invention;
Fig. 3 is deadweight and the damping property figure of austempered ductile iron lining of the present invention;
Fig. 4 is the corrosion resistance nature figure of austempered ductile iron lining of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explanation.
Fig. 1 is the cross-sectional view of austempered ductile iron lining of the present invention; Fig. 2 is the wear resisting property figure of austempered ductile iron lining of the present invention; Fig. 3 is deadweight and the damping property figure of austempered ductile iron lining of the present invention; Fig. 4 is the corrosion resistance nature figure of austempered ductile iron lining of the present invention.
As shown in Figure 1, austempered ductile iron lining material of the present invention is spheroidal graphite cast iron, by the mode of isothermal quenching, improves the performance characteristics of product.
Concrete thermal treatment process is as follows:
At first adopt spheroidal graphite cast iron casting lining, then lining is put into chamber type electric resistance furnace and be heated to 850～950 ℃, be incubated 1 hour; Lining after will heating is then quenched in 250～300 ℃ the nitrate furnace immediately, is incubated 1 hour; About the water-cooled of coming out of the stove again 5 minutes; Check at last, pack.
Embodiment 1
The lining that casting is good is put into chamber type electric resistance furnace and is heated to 850 ℃, is incubated 1 hour, and the lining after will heating is then quenched in 250 ℃ the nitrate furnace immediately, is incubated 1 hour, and the water-cooled of coming out of the stove again 5 minutes is finished heat treatment process.After the drawn test, tensile strength 1530Mpa, unit elongation are 0.8%, and ballistic work is 36J.
Embodiment 2
The lining that casting is good is put into chamber type electric resistance furnace and is heated to 950 ℃, is incubated 1 hour, and the lining after will heating is then quenched in 300 ℃ the nitrate furnace immediately, is incubated 1 hour, and the water-cooled of coming out of the stove again 5 minutes is finished heat treatment process.After the drawn test, tensile strength 1350Mpa, unit elongation are 3%, and ballistic work is 40J.
The lining that casting is good is put into chamber type electric resistance furnace and is heated to 900 ℃, is incubated 1 hour, and the lining after will heating is then quenched in 275 ℃ the nitrate furnace immediately, is incubated 1 hour, and the water-cooled of coming out of the stove again 5 minutes is finished heat treatment process.After the drawn test, tensile strength 1412Mpa, unit elongation are 2%, and ballistic work is 30J.
Austempered ductile iron lining of the present invention has reached following performance characteristics:
1, after the casting, nodulizing grade is the 1-4 level among the GB9441-88;
2, after the casting, graphite size is not for being coarser than 5 grades of GB94441-88;
3, hardness is HRC40-48;
4, radial crushing strength 〉=2000N/mm
2
5, mechanical property: tensile strength sigma
b〉=1200Mpa, unit elongation δ 〉=1%, non-notch ballistic work (40 ℃) α
k〉=35J;
Austempered ductile iron lining of the present invention has high strength, high rigidity, good advantages such as impact, high-wearing feature and fatigue resistance, and its mechanism of action is as follows:
1, wear-resisting mechanism
Austempered ductile iron has outstanding wear resistance, and as shown in Figure 2, a series of wearing tests that austempered ductile iron and quenched and tempered steel, hardened steel, modified magnesium iron carry out in the different hardness level also prove that the polishing machine of austempered ductile iron is higher than other three kinds of materials.And because the effect of profit certainly of globular graphite in the austempered ductile iron lining significantly reduces the abrasion loss to the mill material, in addition, as magnesium iron, it and steel round pin belong to the xenogenesis material to mill, so more be better than steel-steel under the dry grinding condition to mill.
2, deadweight and damping property
As shown in Figure 3, by the Young's modulus of finding out austempered ductile iron among the figure less than steel, so when forced vibration, it to the vibration damping speed of vibrating mass than steel fast about 40%, this damping property of austempered ductile iron lining makes the vibration of vehicle and noise that suitable improvement be arranged again, and light by 10% from the anharmonic ratio steel, it is slight that it not only self is worn away, and all alleviate with other abrasion that rub positions.
3, rotproofness, hardening capacity, surface hardening
As shown in Figure 4, the erosion resistance of austempered ductile iron is better than ordinary steel, this friction pair for austempered ductile iron lining and this form of steel sleeve is very favourable, and austempered ductile iron has the cold working hardening behavior, can stand long term wear, this also is far superior to general steel, adds the good hardening capacity of austempered ductile iron, hardenability, has constituted the outstanding important mechanism of wear resistance of austempered ductile iron.
Thermal treatment process of the present invention has improved the performance of lining effectively, has improved the comfortableness of train running, has improved security, has market outlook preferably.
The above only is preferred implementation of the present invention; be noted that for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. the thermal treatment process of an austempered ductile iron lining is characterized in that, may further comprise the steps:
Step (1), cast lining with spheroidal graphite cast iron, carry out mechanical workout;
Step (2), lining is put into chamber type electric resistance furnace be heated to 850～950 ℃, be incubated 1 hour;
Step (3), the lining after will heating are quenched in 250～300 ℃ the nitrate furnace immediately, are incubated 1 hour;
Step (4), the water-cooled of coming out of the stove are about 5 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102185775A CN103276181A (en) | 2013-06-04 | 2013-06-04 | Heat treatment process of austempered ductile iron bushing |
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|---|---|---|---|
| CN2013102185775A CN103276181A (en) | 2013-06-04 | 2013-06-04 | Heat treatment process of austempered ductile iron bushing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925784A (en) * | 2016-07-07 | 2016-09-07 | 安庆市庆华精工机械有限责任公司 | Novel heat treatment device and method for austempered ductile iron bush |
| CN110049916A (en) * | 2016-12-28 | 2019-07-23 | 株式会社小松制作所 | Crawler belt bearing insert and its manufacturing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1718768A (en) * | 2005-07-20 | 2006-01-11 | 山东建筑工程学院材料科学研究所 | Bainite auctile iron isothermal quenching technology |
-
2013
- 2013-06-04 CN CN2013102185775A patent/CN103276181A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1718768A (en) * | 2005-07-20 | 2006-01-11 | 山东建筑工程学院材料科学研究所 | Bainite auctile iron isothermal quenching technology |
Non-Patent Citations (1)
| Title |
|---|
| 陈奕高: "球墨铸铁衬套的热处理工艺研究", 《装备制造技术》, 15 September 2010 (2010-09-15) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925784A (en) * | 2016-07-07 | 2016-09-07 | 安庆市庆华精工机械有限责任公司 | Novel heat treatment device and method for austempered ductile iron bush |
| CN110049916A (en) * | 2016-12-28 | 2019-07-23 | 株式会社小松制作所 | Crawler belt bearing insert and its manufacturing method |
| US11162152B2 (en) | 2016-12-28 | 2021-11-02 | Komatsu Ltd. | Bearing bushing for track, and method for producing the same |
| CN110049916B (en) * | 2016-12-28 | 2022-03-01 | 株式会社小松制作所 | Bearing bush for crawler belt and method for manufacturing same |
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Application publication date: 20130904 |