CN2416109Y - Boriding & sulphurizing composite layer on steel member surface - Google Patents

Abstract

The utility model relates to a boronizing and sulfurizing composite layer deposited on the surface of a steel member, which can further raise the lubrication property and the abrasion-resisting property of the surface of the steel member. The utility model comprises the steel member after pre-processing; a boronizing layer exists on one surface or a plurality of surfaces of the steel member; a sulfurizing layer seeps on the boronizing layer; therefore, a boronizing and sulfurizing composite layer is formed. The steel member of the utility model can be mechanical components in various shapes. The utility model forms a composite layer of metal boride and metal sulfide on the surface of the steel member through the sulfurizing and boronizing treatment. The composite layer has the characteristics of high binding strength, high abrasion resistance, good lubrication, good seizure resistance and convenient and simple processing.

Description

A kind of boronising sulfurizing composite bed of steel piece surface

The utility model relates to a kind of boronising sulfurizing composite bed that is deposited on steel piece surface, and it can further improve the lubrication and wear resistance property of steel piece surface.The utility model also relates to the application of this composite bed in each bearing of tooth-wheel bit.

Carry out the boronising processing at steel piece surface and can make it possess good red hardness and wear resistance, and the boronising operating procedure is simple, production efficiency is high, cost is low, thereby be widely used.Tooth-wheel bit is used for the geological drilling of oil, mineral products, because tooth-wheel bit is to turn round under the condition of high-strength, high pressure, HI high impact, therefore needs the bearing surface of tooth-wheel bit to have good lubrication and wear resistance property.At present, most of drill produced both domestic and external producer all adopts and carries out the mode that boronising handles on the bearing journal surface of tooth-wheel bit and increase the bearing wear resistance.Yet, because boride layer is thinner, piece surface after the boronising can't carry out ground finish, so the roughness of boronising steel piece surface is higher, because bearing is in boundary lubrication condition, under the high speed and high pressure operating mode, bearing surface is more coarse, and wearing and tearing are more serious, and frictional heat is bigger, the bearing easy interlock of healing, even kill.So only boronising is handled on the bearing journal face of tooth-wheel bit, being difficult to adapt to high rotating speed, high the pressure of the drill is the requirement of the modern drilling technology of feature.For this reason, both at home and abroad drill bit manufacturing firm has begun to adopt bearing journal built-up welding high-carbon cobalt chromium tungsten technology, but its advantage is the overlay cladding ground finish, and surfaceness is low, but this mode exists operating procedure complexity, production efficiency is low, cost is high shortcoming.Above-mentioned situation also is present in other field of machinofacture.

The purpose of this utility model is to improve steel part boronising surface lubrication and the relatively poor defective of seizure resistance in the prior art, utilize the metal sulfuric horizon to have the characteristic of solid lubricant, a kind of boronising sulfurizing composite bed that is formed at steel piece surface is provided, this composite bed is not only wear-resisting, and has good lubricating property.

The technical solution of the utility model is: have the steel part after the preprocessing, have boride layer on one or more surfaces of steel part, its difference is to be impregnated with sulphide layer on boride layer, form a boronising sulfurizing composite bed thus.

Steel part of the present utility model can be the component of machine of different shape, as axle, bearing, gear, tooth-wheel bit part etc.The boride layer of steel piece surface can adopt conventional metallic surface boriding process technology to handle, sulphide layer can be formed by the technical finesse of low temperature ion sulfuration surface treatment, usually the thickness of boride layer is 0.01-0.2mm, the thickness of sulphide layer is 0.001-0.30mm, the concentration of infiltration layer can have cementation zone under the workpiece boronising sulfurizing composite bed to low-carbon alloy steel usually from showing the interior gradient layer that progressively reduces that is.The utility model sulphide layer major ingredient is metallic carbide, also the little metal oxide compound can be arranged.

The utility model is handled the boronising steel piece surface by adopting low temperature ion sulfuration surface treatment technology, make steel piece surface form the composite bed of metal boride and metallic sulfide, this composite bed and steel piece surface have good binding intensity, and because sulphide layer is to the fusion effect of boride layer and the effect of the solid lubricant that sulphide layer possessed, make the utility model not only have stronger wear resistance, and possess good lubricity and seizure resistance.The utility model is used for the cone bit bearing journal surface, its supporting capacity, work-ing life, running speed are greatly improved, can adapt to the requirement of the modern drilling technology of high rotating speed, high the pressure of the drill.The utility model also has the advantage that the process operation method is easy, production efficiency is high, cost of manufacture is low.

Fig. 1 is the diagrammatic cross-section of the utility model surface infiltration level structure.(a) expression steel part matrix, (b) expression boride layer, (c) expression sulphide layer

Fig. 2 is the composite bed distribution plan among embodiment of the utility model.

Below in conjunction with accompanying drawing the utility model embodiment is further described.

Steel part is the bit leg journel 1 in the tooth-wheel bit, material is a low-carbon alloy steel, through surface cementation and precision work, the bit leg journel surface comprises big axle journal 2 surfaces, pilot pin 3 surfaces, axle journal locking slot 4 surfaces, one thrust surface of axle journal 6, axle journal two road thrust surfaces 5, can to above-mentioned surface any one or a plurality ofly carry out boronising and handle, boride layer thickness is 0.05-0.1mm, after boronising and Q-tempering processing, clean, carrying out low temperature ion sulfuration then handles, treatment temp is 180-190 ℃, and the sulfurizing medium is H ₂S and CS ₂It perhaps is the bright sulfur steam, treatment time is 6-8 hour, on boride layer, form one deck sulphide layer, the thickness of sulphide layer is 0.02-0.03mm, can in the metallic sulfide that constitutes sulphide layer, contain a spot of metal oxide, the whole surface of this bit leg journel is after the boronising sulfurizing is handled, compare with the like product of handling without sulfurizing, its bite-resistant performance is significantly improved, compare with built-up welding high-carbon cobalt chromium tungsten, its course of processing is easy, production cost is low, the various performances of use near or surpass, application prospect is very good, solved and produced the medium-term and long-term difficult problem that exists of high speed and high pressure tooth-wheel bit, the probing production efficiency of tooth-wheel bit is significantly improved.

Claims (6)

1, a kind of boronising sulfurizing composite bed of steel piece surface has the steel part after the preprocessing, has boride layer on one or more surfaces of steel part, it is characterized in that being impregnated with on boride layer sulphide layer, forms a boronising sulfurizing composite bed thus.

2, by the boronising sulfurizing composite bed of the described steel piece surface of claim 1, the thickness that it is characterized in that boride layer is 0.01-0.2mm, and the thickness of sulphide layer is 0.001-0.30mm, and the concentration of infiltration layer is from showing the interior gradient layer that progressively reduces that is.

3,, it is characterized in that in the metallic sulfide that constitutes sulphide layer, containing the little metal oxide compound by the boronising sulfurizing composite bed of claim 1 or 2 described steel piece surfaces.

4, press the boronising sulfurizing composite bed of the described steel piece surface of claim 3, it is characterized in that described steel part is the bit leg journel in the tooth-wheel bit, described boronising sulfurizing composite bed is present in any one or a plurality of surface in the big journal surface, pilot pin surface, axle journal locking slot surface, one thrust surface of axle journal, axle journal two road thrust surfaces of bit leg journel.

5, by the boronising sulfurizing composite bed of the described steel piece surface of claim 4, it is characterized in that boride layer thickness is 0.05-0.1mm, the thickness of sulphide layer is 0.02-0.03mm.

6, by the boronising sulfurizing composite bed of claim 2 or 4 described steel piece surfaces, it is characterized in that the material in the steel part is a low-carbon alloy steel, under boronising sulfurizing composite bed, have cementation zone.

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