CN102140605A - Alloy vermicular graphite cast iron for brake disc of rail transit vehicle - Google Patents
Alloy vermicular graphite cast iron for brake disc of rail transit vehicle Download PDFInfo
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- CN102140605A CN102140605A CN2011100306672A CN201110030667A CN102140605A CN 102140605 A CN102140605 A CN 102140605A CN 2011100306672 A CN2011100306672 A CN 2011100306672A CN 201110030667 A CN201110030667 A CN 201110030667A CN 102140605 A CN102140605 A CN 102140605A
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Abstract
The invention relates to an alloy vermicular graphite cast iron for brake disc of rail transit vehicle, which comprises the following components in percentage by weight: 3.4%-3.9% of carbon, 1.9%-3.0% of silicon, 0.4%-1.0% of manganese, 0.4%-1.0% of copper, 0.20%-0.60% of molybdenum, 0.10%-0.20% of titanium, 0.02%-0.028% of rare earth and the balance of inevitable impurities and ferrum. The invention also provides a brake disc made of the alloy vermicular graphite cast iron. The alloy vermicular graphite cast iron has the characteristics of high tensile strength, stable high-temperature mechanical properties, good thermal fatigue resistance, excellent heat conductivity and difficulty in generation of heat cracking. The brake disc for the rail transit vehicle, which is made of the alloy vermicular graphite cast iron, can ensure high reliability of the brake device and train operation safety, and simultaneously reduces high maintenance cost caused by faults of the brake disc.
Description
Technical field
The present invention relates to a kind of retarding disc vermicular cast iron, relate in particular to a kind of alloy vermicular cast iron that is used to make the rail traffic vehicle braking dish, the invention still further relates to the retarding disc that is used for rail traffic vehicles that utilizes above-mentioned alloy vermicular cast iron manufacturing.
Background technology
Breaking system is one of gordian technique of rail traffic vehicles (especially urban rail transit vehicles), is directly connected to the operating safety of train.The breaking system of rail traffic vehicles adopts the tread brake mode mostly at present, this mode of braking heat more than 90% in braking procedure is absorbed by wheel, therefore in speed than under the condition with higher, making wheel tread produce high temperature easily peels off or thermal crack, the noise of tread brake is also bigger, is the following vehicle of 100km/h so this mode of braking generally is applicable to the speed of a motor vehicle.In order to improve this situation, surpass in the rail traffic vehicles of 100km/h in the speed of a motor vehicle, brake rigging generally adopts the disc braking mode.
Because retarding disc can experience at short notice and be rapidly heated and the strong convection temperature-fall period during train braking, this must cause retarding disc will bear very high thermal load and thermal stresses in braking procedure.Based on this abominable operating mode, the rail traffic vehicle braking disk material must have good high-temperature mechanical property, thermal fatigue resistance, stable heat resistance and certain resistance of oxidation; In order to reduce the thermal stresses in the braking procedure, this material also must have good heat-conducting.
At present, the rail traffic vehicle braking disk material all adopts common grey iron, and this material has advantages such as cost is low, wear resistance is good.But it is satisfactory that the physical strength of common grey iron retarding disc, mechanical behavior under high temperature and thermal fatigue resistance are difficult to.For the high reliability of assurance drift stop and the security of train operation, reduce the high maintenance cost that brings because of the retarding disc fault simultaneously, be necessary disc material is optimized, improves.
Summary of the invention
Purpose of the present invention is to provide a kind of rail traffic vehicle braking dish alloy vermicular graphite iron material on the one hand, and this material has the advantages that tensile strength height, mechanical behavior under high temperature are stable, heat conductivility is good, anti-fatigue performance good, nodulizing rate is high, perlite is moderate.
For achieving the above object, a kind of rail traffic vehicle braking dish alloy vermicular cast iron provided by the invention, by weight percentage, its chemical constitution comprises: carbon: 3.4-3.9%, silicon: 1.9-3.0%, manganese: 0.4-1.0%, copper: 0.4-1.0%, molybdenum: 0.20-0.60%, titanium: 0.10-0.20%, rare earth: 0.02-0.028%, all the other are unavoidable impurities and iron.
Preferably, this retarding disc is with in the alloy vermicular cast iron, and by weight percentage, unavoidable impurities comprises: phosphorus:＜0.03%, and sulphur:＜0.02%.
Preferably, this retarding disc is with in the alloy vermicular cast iron, and described rare earth is lanthanum base rare earth or cerium base rare earth.
As a kind of embodiment, described retarding disc alloy vermicular cast iron is smelted by IGBT medium-frequency induction furnace melting technology and is obtained.
Purpose of the present invention is to provide a kind of retarding disc that adopts above-mentioned alloy vermicular graphite iron material to make on the other hand, make retarding disc can guarantee the high reliability of drift stop and the security of train operation, and can be under the complex working condition of the temperature field of alternation and high heat load non-stop run and not breaking down, thereby reduce maintenance cost.As a kind of embodiment, described retarding disc obtains by resin sand machine molding casting technique.
Rail traffic vehicle braking dish of the present invention has the following advantage that has with alloy vermicular cast iron and with the retarding disc of this alloy vermicular cast iron manufacturing than prior art:
(1) has advantages of higher tensile strength at normal temperatures;
(2) mechanical behavior under high temperature is stable, heat conductivility is good, thermal fatigue resistance good and have good heat resistance;
(3) have stronger resistance to wear, anti scuffing ability and non-deformability;
(4) sulphur, phosphorus impurities content are low, have good low-temperature impact property;
(5) have stronger heat-resistant cracking energy and corrosion resistance nature, thus the work-ing life that can improve retarding disc.
Description of drawings
Instantaneous coefficient of friction graphic representation and other testing datas of gained when the retarding disc that Fig. 1 shows the embodiment of the invention applies 120km/h velocity stage service braking continuously in brake power test in 1: 1;
Instantaneous coefficient of friction graphic representation and other experimental datas of gained when the retarding disc that Fig. 2 shows the embodiment of the invention carries out the snub of 60km/h-135km/h velocity stage in brake power test in 1: 1.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is specifically described.
A kind of rail traffic vehicle braking dish alloy vermicular cast iron that embodiment of the present invention provides, by weight percentage, its chemical constitution comprises:
Carbon C:3.4-3.9%, silicon Si:1.9-3.0%, manganese Mn:0.4-1.0%, copper Cu:0.4-1.0%, molybdenum: 0.20-0.60%, titanium: 0.10-0.20%, phosphorus P:＜0.03%, sulphur S:＜0.02%, rare earth: 0.02-0.028%.
In this composition divided, main component had carbon, silicon, manganese, copper, iron; Improve the performance composition molybdenum, titanium, rare earth are arranged; Phosphorus, sulphur then are impurity.The effect of the various compositions in the alloy vermicular cast iron of the present invention and concrete content are as follows:
(1) carbon and silicon
Carbon C and silicon Si are the strong graphited elements that promotes.C, Si are high more in the cast iron, and greying is easy more carries out, but too high meeting causes graphite how and thick, and ferrite content increases in the tissue, and either pearlite occurred reduces, and material mechanical performance reduces.Therefore, in order to guarantee to obtain the graphite of some amount, increase pearlitic content, C generally is controlled at 3.4-3.9%, and Si is controlled at 1.9-3.0%.
(2) manganese
Manganese Mn hinders graphited element, but it can combine with the S in the vermicular cast iron, forms that MnS is floating to be collected in the slag, hinder graphitizing thereby weaken S, add manganese simultaneously and can improve content of pearlite in alloy, improve intensity, hardness, but plasticity reduces, so the general manipulated variable of Mn is 0.4-1.0%.
(3) copper
Copper is refine pearlite significantly, and promotes to increase pearlitic content, and copper can also improve the strength of materials and keep high-ductility simultaneously.But above-mentioned constituent content one regularly, and high more then its effect of copper content can correspondingly weaken on the contrary.Therefore the optimum range of copper is controlled at 0.4-1.0% and is advisable.
(4) rare earth
Rare earth adds with the form of vermicular cast iron vermiculizer.Except that also have good molten iron purification effect as rare earth the vermiculizer, can significantly reduce the content of harmful element in the molten iron.Because different rare earth elements has different spheroidization abilities to graphite, therefore when producing vermicular cast iron, must select suitable rare earth element as vermiculizer.In addition, the add-on of rare earth element also can obviously influence the form of graphite in the cast iron, therefore must strict add-on and the residual quantity of controlling rare earth element.
Because retarding disc is thinner relatively, in order to obtain uniform quasiflake graphite tissue, preferred cerium base rare earth or lanthanum base rare earth are as vermiculizer, and the add-on of strict control rare earth element is to obtain best vermiculation effect.General requirement vermicular cast iron middle-weight rare earths content is between 0.02-0.028%.
(5) molybdenum and titanium
Containing a spot of molybdenum and titanium in the material mainly is mechanical property and the heat-resistant anti-fatigue performance that further improves material, but too much unsuitable, and therefore the composition of controlling molybdenum is in the 0.20-0.60% scope, and the composition of titanium is in the 0.10-0.20% scope.
(6) sulphur
Sulphur is the strong graphited element that hinders, and S hinders the diffusion of C atom, and S can also strengthen the bonding force of Fe, C atom; Simultaneously, S can make the flowability of molten iron reduce, and shrinkage increases, and make cast iron that bigger hot cracking tendency be arranged, so S content is low more good more in the cast iron, generally will be controlled at below 0.02%.
(7) phosphorus
Though phosphorus P plays a driving role slightly to greying, improves castability, P has cold shortness, and too high levels can have a strong impact on the low-temperature performance of retarding disc, so content is low more good more, generally is controlled at below 0.03%.
According to concrete technical scheme of the present invention, alloy vermicular cast iron of the present invention can pass through the smelting of IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) medium-frequency induction furnace melting technology and obtain.This medium-frequency induction furnace smelting technology can may further comprise the steps:
Charging (wherein, the furnace charge that the is difficult for oxidation electric furnace of directly packing into, easily the furnace charge of oxidation adds according to processing requirement in smelting process in batches)-(power with 30% carries out refining-go out alloy vermicular cast iron to furnace charge in fusing (utilize high-power furnace charge is melted fast)-refining.
The present invention also provides a kind of retarding disc that adopts above-mentioned alloy vermicular cast iron to make.This retarding disc can form by the casting of resin sand machine molding casting technique.Its technical process for casting is specially:
Casting position design-fractal area design-shrinkage design-process redundancy design-casting system design-rising head, chill, the design-die design of casting muscle and manufacturing-moulding, make core-sand mold heating-casting.
Table 1 has shown the embodiment 1 that adopts the retarding disc that alloy vermicular cast iron of the present invention makes and the chemical ingredients of embodiment 2.
The chemical ingredients of table 1 retarding disc (massfraction %)
| Element | C | Si | Mn | Cu | P | S | Rare earth | Mo | Ti |
| |
3.58 | 2.53 | 0.75 | 0.68 | 0.03 | 0.02 | 0.023 | 0.25 | 0.10 |
| |
3.60 | 2.48 | 0.69 | 0.83 | 0.029 | 0.018 | 0.026 | 0.34 | 0.12 |
After tested, the retarding disc performance that adopts alloy vermicular cast iron of the present invention to make is as follows:
Tensile strength: 〉=450MPa
Elongation after fracture: 〉=1%
Hardness (HB): 200～250
Nodulizing rate: 〉=65%
Content of pearlite in alloy: 〉=55%
The test example
The retarding disc of the employing embodiment of the invention 1 applies the test of 120km/h velocity stage service braking continuously in brake power test in 1: 1.The concrete test parameter of this operating condition of test is:
Wheel diameter: 840mm, retarding disc external diameter: 640mm, brake lining material: synthetic materials, friction radius: 217mm, one-sided brake lining pressure: 12KN (simulation service braking pressure).
Fig. 1 is the result of test back gained, the instantaneous coefficient of friction graphic representation and the testing datas such as range averaging frictional coefficient, retarding disc initial temperature and retarding disc top temperature of gained when it shows retarding disc apply 120km/h velocity stage service braking continuously in brake power test in 1: 1.
The retarding disc of the employing embodiment of the invention 1 carries out the experiment of 60km/h-135km/h velocity stage snub in brake power test in 1: 1.The concrete test parameter of this operating condition of test is:
Wheel diameter: 840mm, retarding disc external diameter: 640mm, brake lining material: synthetic materials, friction radius: 217mm, one-sided brake lining pressure: 24.3KN (simulation emergency brake pressure)
Fig. 2 is the result of test back gained, the instantaneous coefficient of friction graphic representation and the testing datas such as range averaging frictional coefficient, retarding disc initial temperature and retarding disc top temperature of gained when it shows retarding disc carry out the snub of 60km/h-135km/h velocity stage in brake power test in 1: 1.
More than two groups of test-results all show, the retarding disc stable friction factor in braking procedure that adopts alloy vermicular cast iron of the present invention to make, have stronger resistance to wear, the anti scuffing ability; And the heat conductivility of retarding disc is good as can be known, thermal fatigue resistance good according to the initial temperature of the retarding disc of gained and top temperature data.
In addition, utilize the retarding disc of embodiment 1 and embodiment 2 in brake power test in 1: 1, to carry out the test of 150km/h velocity stage, test-results shows that also this retarding disc stable friction factor is very good, and the no hot spot in retarding disc surface, thermal crack appearance and do not have the noticeable wear phenomenon.
Protection scope of the present invention is not limited to disclosed specific embodiment in the above-mentioned embodiment, as long as but the combination of satisfying technical characterictic in the claim of the present invention just fallen within protection scope of the present invention.
Claims (6)
1. rail traffic vehicle braking dish alloy vermicular cast iron, by weight percentage, its chemical constitution comprises:
Carbon: 3.4-3.9%, silicon: 1.9-3.0%, manganese: 0.4-1.0%, copper: 0.4-1.0%, molybdenum: 0.20-0.60%, titanium: 0.10-0.20%, rare earth: 0.02-0.028%, all the other are unavoidable impurities and iron.
2. alloy vermicular cast iron according to claim 1 is characterized in that, by weight percentage, described unavoidable impurities comprises:
Phosphorus:＜0.03%, sulphur:＜0.02%.
3. alloy vermicular cast iron according to claim 1 is characterized in that, described rare earth is lanthanum base rare earth or cerium base rare earth.
4. alloy vermicular cast iron according to claim 1 is characterized in that, described alloy vermicular cast iron is smelted by I GBT medium-frequency induction furnace melting technology and obtained.
5. retarding disc that is used for rail traffic vehicles, it is made by each described alloy vermicular cast iron of claim 1 to 4.
6. retarding disc according to claim 5 is characterized in that, described retarding disc obtains by resin sand machine molding casting technique.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100306672A CN102140605A (en) | 2011-01-28 | 2011-01-28 | Alloy vermicular graphite cast iron for brake disc of rail transit vehicle |
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|---|---|---|---|
| CN2011100306672A CN102140605A (en) | 2011-01-28 | 2011-01-28 | Alloy vermicular graphite cast iron for brake disc of rail transit vehicle |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676910A (en) * | 2012-04-22 | 2012-09-19 | 洛阳古城机械有限公司 | Vermicular iron and preparation method thereof and flywheel made of same |
| CN105483508A (en) * | 2014-09-29 | 2016-04-13 | 常州朗锐铸造有限公司 | Alloy vermicular graphite cast iron for railway vehicle brake disc and smelting method of alloy vermicular graphite cast iron |
| CN106077534A (en) * | 2016-08-17 | 2016-11-09 | 河南理工大学 | Pig mold, preparation method and bridging method thereof |
| CN107090561A (en) * | 2017-04-01 | 2017-08-25 | 长兴微羽智能科技有限公司 | The alloy cast iron and its Technology for Heating Processing of a kind of brake disk |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880815A (en) * | 2009-05-06 | 2010-11-10 | 中国铁道科学研究院机车车辆研究所 | Alloy vermicular cast iron for brake disks of urban rail transit vehicles and railway locomotives |
-
2011
- 2011-01-28 CN CN2011100306672A patent/CN102140605A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880815A (en) * | 2009-05-06 | 2010-11-10 | 中国铁道科学研究院机车车辆研究所 | Alloy vermicular cast iron for brake disks of urban rail transit vehicles and railway locomotives |
Non-Patent Citations (2)
| Title |
|---|
| 《山东农机》 20040430 李存科等 高速列车特种铸铁制动盘铸造工艺研究 第21-22页 1-6 , 第4期 * |
| 李存科等: "高速列车特种铸铁制动盘铸造工艺研究", 《山东农机》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676910A (en) * | 2012-04-22 | 2012-09-19 | 洛阳古城机械有限公司 | Vermicular iron and preparation method thereof and flywheel made of same |
| CN105483508A (en) * | 2014-09-29 | 2016-04-13 | 常州朗锐铸造有限公司 | Alloy vermicular graphite cast iron for railway vehicle brake disc and smelting method of alloy vermicular graphite cast iron |
| CN105483508B (en) * | 2014-09-29 | 2018-03-13 | 常州朗锐铸造有限公司 | Brake disc for railway vehicle alloy vermicular cast iron and its method of smelting |
| CN106077534A (en) * | 2016-08-17 | 2016-11-09 | 河南理工大学 | Pig mold, preparation method and bridging method thereof |
| CN106077534B (en) * | 2016-08-17 | 2018-05-11 | 河南理工大学 | Pig mold, preparation method and its bridging method |
| CN107090561A (en) * | 2017-04-01 | 2017-08-25 | 长兴微羽智能科技有限公司 | The alloy cast iron and its Technology for Heating Processing of a kind of brake disk |
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Application publication date: 20110803 |