CN101412094A - Method for preparing composite wear-resistant guard rail - Google Patents
Method for preparing composite wear-resistant guard rail Download PDFInfo
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- CN101412094A CN101412094A CNA200810232496XA CN200810232496A CN101412094A CN 101412094 A CN101412094 A CN 101412094A CN A200810232496X A CNA200810232496X A CN A200810232496XA CN 200810232496 A CN200810232496 A CN 200810232496A CN 101412094 A CN101412094 A CN 101412094A
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- guard rail
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- safety rail
- iron
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Abstract
The invention discloses a method for preparing a composite antiwear safety rail, which comprises the following steps: alloy dust core bars are bound into bundles and arranged in a safety rail working part cavity of a safety rail casting mould, and the volume of the alloy dust core bars accounts for 20 to 60 percent of the total volume of the safety rail; molten matrix metal is cast into the safety rail casting mould cavity, the alloy dust core bars are melted and dissolved under the heat effect of the matrix metal, a great number of alloy elements and the molten matrix metal generate metallurgical combination reaction so as to generate a highly dispersed alloy structure on the original position; and finally the alloy structure is cooled and solidified, and the bar-shaped hard phase is metallurgically and transitionally combined into a whole with the matrix metal, thereby preparing the composite safety rail which takes the high-strength and high-ductility metal as the matrix and contains a certain number of metallurgically combined bar-shaped hard points. The composite anti-wear safety rail has high strength and high ductility of the matrix metal and high hardness and high wear resistance of the hard phase, can simultaneously bear high pressure and strong wear, and has the characteristics of long service life, low price, simple preparation and so on.
Description
Technical field
The present invention relates to be used for the preparation of the guard rail of railway switch, a kind of preparation method of composite wear-resistant guard rail particularly, the wear-resistant guard rail of this method preparation wherein contains the column shaped horniness point, realized the organic unity of wearability and obdurability, the overall mechanical properties of guard rail is significantly improved.
Background technology
Guard rail is one of requisite strength member in railway switch place, and its effect is that safety and steady passes through when guaranteeing train through track switch.In some occasion (for example bridge, tunnel etc.), guard rail is one of key components and parts that ensures train operating safety.Present track switch is mainly made by common short rail, hardness is lower, wear no resistance, under the impact and friction of the train wheel of running at high speed, guard rail working face serious wear, thereby cause guard rail lower service life, this has increased on-the-spot maintenance workload and maintenance cost undoubtedly, and has a strong impact on train traffic safety.
Summary of the invention
Defective or deficiency at above-mentioned prior art existence, the objective of the invention is to, a kind of preparation method of composite wear-resistant guard rail is provided, the composite wear-resistant guard rail of this method preparation is composited by high rigidity column shaped horniness point and high tenacity parent metal two parts, the high strength and the high tenacity that had both had parent metal, the high rigidity and the high-wearing feature that have the hard phase again can be born high impact forces and strong wear simultaneously, have long service life, preparation technology's characteristic of simple.
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of preparation method of composite wear-resistant guard rail, it is characterized in that, this method is rolled the alloy powder core bar bundled, be arranged in the guard rail working portion die cavity of guard rail casting mold, alloy powder core bar bundle accounts for 20%～60% of guard rail cumulative volume, then the parent metal liquid of fusing is poured in the casting mold die cavity of guard rail, under the heat effect of parent metal, the alloy powder core bar melts, dissolving, a large amount of alloying elements and parent metal liquid in the alloy powder core bar produce metallurgical combination reaction, generate highly dispersed alloy structure in position, last cooled and solidified forms bar-shaped hard and combines with the transition of parent metal metallurgy and combine together, and the metal made from high-toughness high-strength is a matrix, include the compound guard rail of bar-shaped high rigidity particle of the metallurgical binding of some.
Adopt the composite wear-resistant guard rail of method preparation of the present invention to have the following advantages:
1, owing to adopt the alloy powder core bar, inner filler alloys powder, under the high temperature action of parent metal liquid, alloy powder sintering in the alloy powder core bar, dissolving, diffusion, metallurgical combination reaction takes place with parent metal liquid, simultaneously because the heat-absorbing action of alloy powder, reduced local temperature, shortened crystallization process, hindered the further diffusion of alloying element, thereby made alloying element enrichment in position, the remarkable refinement of crystal grain, separate out the hard compounds of the high rigidity of a large amount of disperses, just formed the hard phase that is bar-shaped on the macroscopic view that is embedded in the parent metal after solidifying, and combine with the transition of parent metal formation excellent metallurgical, the interface is in conjunction with firm, having solved hard comes off mutually, a cracked difficult problem, wearability and toughness organic unity, overall mechanical properties significantly improves.
2, alloy powder can carry out proportioning according to the instructions for use of guard rail, and composition is adjustable, wide accommodation.
3, because the alloy powder core bar does not contain impurity such as binding agent, therefore can not produce defectives such as slag inclusion, pore, interior tissue is good.
4, composite molding technique controllability of the present invention is strong, yield rate is high, the quality of production is stable, is convenient to large-scale production.
5, column shaped horniness point generates for whole reaction in-situ, avoids the cracking phenomena that usually occurs in the technical process such as built-up welding is compound.
6, according to the applying working condition of guard rail, can regulate the ratio of column shaped horniness point in matrix, the diameter and the distribute spacing of column shaped horniness point (4), and guarantee to be evenly distributed;
7,, can realize region composite, surface recombination or whole compound according to the version of guard rail.
Description of drawings
Fig. 1 is a composite wear-resistant guard rail preparation technology schematic diagram;
Fig. 2 is a composite wear-resistant guard rail structure cutaway view.
The embodiment that provides below in conjunction with accompanying drawing and inventor is described in further detail the present invention.
The specific embodiment
Referring to accompanying drawing, according to technical scheme of the present invention, the alloy powder core bar 1 of preparation certain diameter and alloy powder proportioning is rolled bundledly with certain size and a certain proportion of alloy core bar, be arranged in the guard rail working portion die cavity of guard rail casting mold.Alloy powder core bar bundle accounts for 20%～60% of guard rail cumulative volume, then the parent metal liquid of fusing is poured in the casting mold die cavity of guard rail, under the heat effect of parent metal, the alloy powder core bar melts, dissolving, a large amount of alloying elements and parent metal liquid in the alloy powder core bar produce metallurgical combination reaction, generate highly dispersed alloy structure in position, last cooled and solidified forms bar-shaped hard and combines with the transition of parent metal metallurgy and combine together, and the metal made from high-toughness high-strength is a matrix, include the compound guard rail of bar-shaped high rigidity particle of the metallurgical binding of some.
Above-mentioned alloy powder core bar 1 diameter is Φ 1mm～Φ 10mm, and its crust is 0.1～1mm for the low carbon steel pipe wall thickness, and core is that granularity is 50～200 purpose alloy powders.
The alloy powder of above-mentioned alloy powder core bar 1 core is made of high-carbon chromium iron, can add alloyed powders such as molybdenum-iron powder, ferrotungsten powder, ferrosilicon powder, ferromanganese powder as required.
Above-mentioned alloy powder also can be made of in tungsten carbide, carborundum, titanium carbide, aluminium oxide, silicon nitride, the titanium nitride powder one or more.
Above-mentioned parent metal 3 is a kind of in known cast steels such as potassium steel, mild steel, steel alloy, grey cast-iron, spheroidal graphite cast-iron or the cast iron.
Below be the embodiment that the inventor provides, the present invention is not limited to following examples.
Embodiment 1: the preparation high-chromium alloy is that hard phase, A3 steel are the bar-shaped composite wear-resistant guard rail of matrix
1, it is bundled to select for use the alloy powder core bar 1 of 3mm diameter to roll, and the alloy powder of packing in the alloy powder core bar 1 is a high-carbon chromium iron, and granularity 100～150 orders are cut into and the identical length of guard rail working portion width;
2, adopt resin sand to require to make guard rail casting mold 2 according to casting technique;
3, alloy powder core bar bundle 1 is rolled bundled, 50% ratio according to accounting for wear-resistant guard rail working portion volume is arranged in the guard rail working portion die cavity of wear-resistant guard rail casting mold 2;
4, select for use the A3 steel as parent metal 3, after intermediate frequency furnace smelting fusing, reach 1600 ℃ and come out of the stove, molten steel is poured in the die cavity of wear-resistant guard rail casting mold 2, till filling with;
5, room temperature cooling, treat the molten metal cooled and solidified after, take out foundry goods, sand removal is handled, promptly make high-chromium alloy and be bar-shaped hard mutually 4, the A3 steel is the composite wear-resistant guard rail of parent metal 3.
Certainly, according to actual needs, alloy powder also can be selected the mixture of high-carbon chromium iron and molybdenum-iron powder, ferrotungsten powder, ferrosilicon powder, ferromanganese powder.
Embodiment 2: the preparation tungsten carbide is that hard phase, A3 steel are the bar-shaped composite wear-resistant guard rail of matrix
1, it is bundled to select for use the alloy powder core bar 1 of 5mm diameter to roll, and the alloy powder of packing in the alloy powder core bar 1 is the diamondite powder, and granularity 150 orders are cut into and the identical length of guard rail working portion width;
2, adopt resin sand to require to make guard rail casting mold 2 according to casting technique;
3, with alloy powder core bar 1,40% ratio according to accounting for wear-resistant guard rail working portion volume is preset in the guard rail working portion die cavity of wear-resistant guard rail casting mold 2;
4, select for use the A3 steel as parent metal 3, after intermediate frequency furnace smelting fusing, reach 1600 ℃ and come out of the stove, molten steel is poured in the die cavity of wear-resistant guard rail casting mold 2, till filling with;
5, room temperature cooling, treat the molten metal cooled and solidified after, take out foundry goods, sand removal is handled, promptly make tungsten carbide and be bar-shaped hard mutually 4, the A3 structure of steel is the composite wear-resistant guard rail of matrix 3.
Embodiment 3: the preparation tungsten carbide is that hard phase, potassium steel are the bar-shaped composite wear-resistant guard rail of matrix
1, it is bundled to select for use the alloy powder core bar 1 of 3mm diameter to roll, and the alloy powder of packing in the alloy powder core bar 1 is the diamondite powder, and granularity 50～80 orders are cut into and the identical length of guard rail working portion width;
2, adopt resin sand to require to make guard rail casting mold 2 according to casting technique;
3, with alloy powder core bar 1,60% ratio according to accounting for wear-resistant guard rail working portion volume is preset in the guard rail working portion die cavity of wear-resistant guard rail casting mold 2;
4, select for use potassium steel Mn13 as parent metal 3, after intermediate frequency furnace smelting fusing, reach 1650 ℃ and come out of the stove, molten steel is poured in the die cavity of wear-resistant guard rail casting mold 2, till filling with;
5, room temperature cooling, treat the molten metal cooled and solidified after, take out foundry goods, sand removal is handled, promptly make tungsten carbide and be bar-shaped hard mutually 4, potassium steel is organized as the composite wear-resistant guard rail of matrix 3.
In the foregoing description 2,3, according to different demands, alloy powder can also be selected one or more mixtures in carborundum, titanium carbide, aluminium oxide, silicon nitride or the titanium nitride powder.
In the foregoing description, according to different demands, parent metal 3 can also be selected grey cast-iron or spheroidal graphite cast-iron, all can make qualified composite wear-resistant guard rail.
Claims (7)
1, a kind of preparation method of composite wear-resistant guard rail, it is characterized in that, this method is rolled the alloy powder core bar bundled, be arranged in the guard rail working portion die cavity of guard rail casting mold, alloy powder core bar bundle accounts for 20%～60% of guard rail cumulative volume, then the parent metal liquid of fusing is poured in the casting mold die cavity of guard rail, under the heat effect of parent metal, the alloy powder core bar melts, dissolving, a large amount of alloying elements and parent metal liquid in the alloy powder core bar produce metallurgical combination reaction, generate highly dispersed alloy structure in position, last cooled and solidified forms bar-shaped hard and combines with the transition of parent metal metallurgy and combine together, and the metal made from high-toughness high-strength is a matrix, include the compound guard rail of bar-shaped high rigidity particle of the metallurgical binding of some.
2. the method for claim 1 is characterized in that, described alloy powder core bar is diameter of phi 1mm～Φ 10mm, and it is 50 orders～200 purpose alloy powders that the low carbon steel pipe of wall thickness 0.1～1.0mm, core are filled with granularity.
3. method as claimed in claim 2 is characterized in that, described alloy powder is one or more mixtures in tungsten carbide, carborundum, titanium carbide, aluminium oxide, silicon nitride or the titanium nitride powder.
4. method as claimed in claim 2 is characterized in that, described alloy powder is a high-carbon chromium iron, or the mixture of high-carbon chromium iron and molybdenum-iron powder, ferrotungsten powder, ferrosilicon powder, ferromanganese powder.
5, the method for claim 1 is characterized in that, described parent metal is cast steel or cast iron.
6, method as claimed in claim 5 is characterized in that, described cast steel is potassium steel, mild steel or steel alloy.
7, method as claimed in claim 5 is characterized in that, described cast iron is grey cast-iron or spheroidal graphite cast-iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810232496XA CN101412094A (en) | 2008-11-28 | 2008-11-28 | Method for preparing composite wear-resistant guard rail |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810232496XA CN101412094A (en) | 2008-11-28 | 2008-11-28 | Method for preparing composite wear-resistant guard rail |
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| CN101412094A true CN101412094A (en) | 2009-04-22 |
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| CNA200810232496XA Pending CN101412094A (en) | 2008-11-28 | 2008-11-28 | Method for preparing composite wear-resistant guard rail |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104525913A (en) * | 2014-11-18 | 2015-04-22 | 西安理工大学 | Guardrails and a manufacturing method thereof |
| CN104532694A (en) * | 2014-11-18 | 2015-04-22 | 西安理工大学 | Guard rail and preparation method thereof |
| CN105316984A (en) * | 2014-07-29 | 2016-02-10 | 岳池县丽城环保科技有限公司 | High-speed train safety device-guard rail |
-
2008
- 2008-11-28 CN CNA200810232496XA patent/CN101412094A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105316984A (en) * | 2014-07-29 | 2016-02-10 | 岳池县丽城环保科技有限公司 | High-speed train safety device-guard rail |
| CN104525913A (en) * | 2014-11-18 | 2015-04-22 | 西安理工大学 | Guardrails and a manufacturing method thereof |
| CN104532694A (en) * | 2014-11-18 | 2015-04-22 | 西安理工大学 | Guard rail and preparation method thereof |
| CN104532694B (en) * | 2014-11-18 | 2017-04-12 | 西安理工大学 | Guard rail and preparation method thereof |
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Open date: 20090422 |