CN105127916A - Low-thermal expansion and high-corrosion resistance CBN grinding wheel with ultrafine granularity and preparation method thereof - Google Patents

Abstract

The invention discloses a low-thermal expansion and high-corrosion resistance CBN grinding wheel with ultrafine granularity; firstly, CBN abrasives with ultrafine granularity are pretreated in the preparation process of the grinding wheel to improve the mechanical performance; abrasives treated by solution prepared by sodium polystyrenesulfonate and polyethyleneimine are excellent in dispersibility, and are not easy to be agglomerated; the abrasives are formed to a stable system without being precipitated and flocculated in solution; dried powder and adhesive are better in wettability and compatibility, and are tighter and firmer in bonding; such added raw materials as nanometer pyrophyllite and molybdenum powder assist to improve the moisture exhaust dryness and wettability of a blank and to improve the smoothness of a product; adhesive with fluorine carbon resins as main components is excellent in bonding strength, and can improve the surface performance and the strength of the grinding wheel; and the prepared CBN grinding wheel with ultrafine granularity is high in blank strength, stable in heat, high in grinding precision and smooth in surface, resists both oxidation and corrosion, and can be applied to the grinding of metal parts with high precision.

Description

Ultra-fine CBN emery wheel of a kind of low-thermal-expansion improved corrosion and preparation method thereof

Technical field

The present invention relates to Ultra-fine CBN emery wheel preparing technical field, Ultra-fine CBN emery wheel particularly relating to a kind of low-thermal-expansion improved corrosion and preparation method thereof.

Background technology

Ultra-fine CBN emery wheel refers to the class emery wheel made with the CBN abrasive material of Ultra-fine (≤5 μm) and bonding agent, this kind of emery wheel has lower surface roughness and surface damage than traditional emery wheel material, the precision of polishing, grinding is higher, more can improve component surface quality, be also an important directions of emery wheel industry development.

In production technology, due to the Ultra-fine of abrasive material, easily reunite between abrasive material, be deteriorated with the associativity of bonding agent, the emery wheel prepared so just very easily produces cut to surface of the work, affect workpiece quality, therefore, need in process of production to carry out pretreatment to ultra-fine abrasive material, improve compatibility and the dispersiveness of itself and binding agent, development is simultaneously applicable to the binding agent of ultra-fine grain diameter abrasive material, to obtain the finished product of low surface roughness.Also there is the shortcomings such as working (machining) efficiency is low, production cost is higher in the technology preparing Ultra-fine emery wheel at present, needs to improve further and optimizing raw material formula and preparation technology.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, Ultra-fine CBN emery wheel providing a kind of low-thermal-expansion improved corrosion and preparation method thereof.

The present invention is achieved by the following technical solutions:

A Ultra-fine CBN emery wheel for low-thermal-expansion improved corrosion, this emery wheel is made up of the raw material of following weight portion: the forsterite sand 15-18 of the CBN abrasive material 35-40 of granularity≤5 μm, granularity≤5 μm, nanometer pyrophillite 4-5, molybdenum powder 0.1-0.2, binding agent 2-3, lithium bentonite 1-1.5, hydrofluoric acid (concentration 40%) are appropriate, kayexalate 0.5-0.8, polymine 0.4-0.5, shitosan 1-2, deionized water 60-65.

The Ultra-fine CBN emery wheel of described a kind of low-thermal-expansion improved corrosion, described binding agent is made up of the raw material of following weight portion: solid content is that water-base fluorocarbon emulsion 12-15, the sodium alginate 4-5 of 40-45%, nano silicon 2-3, deionized water are appropriate; Its preparation method is: be dissolved in appropriate deionized water by sodium alginate, is stirred to it and dissolves completely, adds water-base fluorocarbon emulsion, nano silicon subsequently, and ultrasonic agitation is dispersed to material and mixes completely and be uniformly dispersed and get final product.

Ultra-fine CBN emery wheel of described a kind of low-thermal-expansion improved corrosion and preparation method thereof, its spy is, described preparation method is:

(1) first CBN abrasive material is dropped into dipping pretreatment 30-40min in hydrofluoric acid solution, filter subsequently, be washed to neutrality, drying for standby;

(2) kayexalate, polymine are dropped in deionized water, be stirred to after material dissolves completely, add the compound abrasive that step (1) obtains, be uniformly mixed, drop into other residual components except binding agent subsequently again, for subsequent use after leaving standstill 1-2h after being uniformly mixed 30-40min;

(3) by the dry process under 80-100 DEG C of condition of step (2) gained material, dried material is broken, cross 200-300 mesh sieve, screened material is mixed with binding agent, by mixed material ball milling dispersion 20-30min after being uniformly mixed, material is die-filling, shaping, the demoulding subsequently, obtain idiosome emery wheel, wherein briquetting pressure is 35-40MPa, subsequently idiosome emery wheel to be sent in the baking oven of 70-80 DEG C after dry 5-6h with the ramp of 4-5 DEG C/min to 230-250 DEG C, naturally cool to room temperature after insulation 4-5h and namely obtain this Ultra-fine CBN emery wheel.

The present invention first utilizes the CBN abrasive material of hydrofluoric acid to Ultra-fine to carry out pretreatment, CBN abrasive surface after process is regular, smooth, mechanical property promotes further, and with kayexalate, abrasive material dispersiveness after the solution immersion treatment of the preparation such as polymine is good, not easily reunite, add shitosan, after the raw materials such as lithium bentonite, abrasive material is formed in the solution and does not precipitate, the stabilising system of flocculation, wetability and the compatibility of dried powder and binding agent are better, bond more close and firm, the nanometer pyrophillite added, the raw materials such as molybdenum powder, auxiliary hydrofuge drying property and the greasy property improving idiosome, improve the smoothness of product, and the binding agent based on fluorocarbon resin not only has good adhesive strength, wheel face performance can also be improved, improve wheel strength, Ultra-fine CBN emery wheel idiosome intensity prepared by the present invention is high, and to thermally-stabilised, grinding accuracy is high, and resistance to oxidation is corroded, any surface finish, can be applicable to high-precision metal parts grinding and uses.

Detailed description of the invention

This embodiment emery wheel is made up of the raw material of following weight portion: the forsterite sand 15 of the CBN abrasive material 35 of granularity≤5 μm, granularity≤5 μm, nanometer pyrophillite 4, molybdenum powder 0.1, binding agent 2, lithium bentonite 1, hydrofluoric acid (concentration 40%) are appropriate, kayexalate 0.5, polymine 0.4, shitosan 1, deionized water 60.

Binding agent is wherein made up of the raw material of following weight portion: solid content be 40% water-base fluorocarbon emulsion 12, sodium alginate 4, nano silicon 2, deionized water appropriate; Its preparation method is: be dissolved in appropriate deionized water by sodium alginate, is stirred to it and dissolves completely, adds water-base fluorocarbon emulsion, nano silicon subsequently, and ultrasonic agitation is dispersed to material and mixes completely and be uniformly dispersed and get final product.

The preparation method of this emery wheel is:

(1) first CBN abrasive material is dropped into dipping pretreatment 30min in hydrofluoric acid solution, filter subsequently, be washed to neutrality, drying for standby;

(2) kayexalate, polymine are dropped in deionized water, be stirred to after material dissolves completely, add the compound abrasive that step (1) obtains, be uniformly mixed, drop into other residual components except binding agent subsequently again, for subsequent use after leaving standstill 1h after being uniformly mixed 30min;

(3) by the dry process under 80 DEG C of conditions of step (2) gained material, dried material is broken, cross 200 mesh sieves, screened material is mixed with binding agent, by mixed material ball milling dispersion 20min after being uniformly mixed, material is die-filling, shaping, the demoulding subsequently, obtain idiosome emery wheel, wherein briquetting pressure is 35MPa, subsequently idiosome emery wheel to be sent in the baking oven of 70 DEG C with the ramp to 230 DEG C of 4 DEG C/min after dry 5h, naturally cool to room temperature after insulation 4h and namely obtain this Ultra-fine CBN emery wheel.

The grinding wheel performance index that the present embodiment prepares is as follows:

Being ground material in test is tool steel, and grinding method is transverse grinding, emery wheel peripheral speed: 100m/s, the speed of table: 0.05m/s, grinding depth: 0.025mm.

The more traditional resin CBN wheel grinding of the emery wheel prepared of the present embodiment improves 155% than average, and the average currying work interval extends 8 times, extends more than 5 times service life.Through the grinding of 60min, the roughness of surface of the work is only 0.04 μm, and surface of the work is without burn, and maximum grinding speed can reach 130m/s.

Claims (3)

1. the Ultra-fine CBN emery wheel of a low-thermal-expansion improved corrosion, it is characterized in that, this emery wheel is made up of the raw material of following weight portion: the forsterite sand 15-18 of the CBN abrasive material 35-40 of granularity≤5 μm, granularity≤5 μm, nanometer pyrophillite 4-5, molybdenum powder 0.1-0.2, binding agent 2-3, lithium bentonite 1-1.5, hydrofluoric acid (concentration 40%) are appropriate, kayexalate 0.5-0.8, polymine 0.4-0.5, shitosan 1-2, deionized water 60-65.

2. the Ultra-fine CBN emery wheel of a kind of low-thermal-expansion improved corrosion as claimed in claim 1, it is characterized in that, described binding agent is made up of the raw material of following weight portion: solid content is that water-base fluorocarbon emulsion 12-15, the sodium alginate 4-5 of 40-45%, nano silicon 2-3, deionized water are appropriate; Its preparation method is: be dissolved in appropriate deionized water by sodium alginate, is stirred to it and dissolves completely, adds water-base fluorocarbon emulsion, nano silicon subsequently, and ultrasonic agitation is dispersed to material and mixes completely and be uniformly dispersed and get final product.

3. the Ultra-fine CBN emery wheel and preparation method thereof of a kind of low-thermal-expansion improved corrosion as claimed in claim 1, its spy is, described preparation method is:

(1) first CBN abrasive material is dropped into dipping pretreatment 30-40min in hydrofluoric acid solution, filter subsequently, be washed to neutrality, drying for standby;

(2) kayexalate, polymine are dropped in deionized water, be stirred to after material dissolves completely, add the compound abrasive that step (1) obtains, be uniformly mixed, drop into other residual components except binding agent subsequently again, for subsequent use after leaving standstill 1-2h after being uniformly mixed 30-40min;

(3) by the dry process under 80-100 DEG C of condition of step (2) gained material, dried material is broken, cross 200-300 mesh sieve, screened material is mixed with binding agent, by mixed material ball milling dispersion 20-30min after being uniformly mixed, material is die-filling, shaping, the demoulding subsequently, obtain idiosome emery wheel, wherein briquetting pressure is 35-40MPa, subsequently idiosome emery wheel to be sent in the baking oven of 70-80 DEG C after dry 5-6h with the ramp of 4-5 DEG C/min to 230-250 DEG C, naturally cool to room temperature after insulation 4-5h and namely obtain this Ultra-fine CBN emery wheel.