CN1299732A - Magnetic grinding tool and its preparation - Google Patents

Magnetic grinding tool and its preparation Download PDF

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Publication number
CN1299732A
CN1299732A CN 00135667 CN00135667A CN1299732A CN 1299732 A CN1299732 A CN 1299732A CN 00135667 CN00135667 CN 00135667 CN 00135667 A CN00135667 A CN 00135667A CN 1299732 A CN1299732 A CN 1299732A
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China
Prior art keywords
bond
granularity
magnetic grinding
grinding tool
abrasive powder
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CN 00135667
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CN1097504C (en
Inventor
张银喜
陈红玲
丁艳红
郭燕莹
张峪生
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Taiyuan University of Technology
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Taiyuan University of Technology
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Abstract

The present invention relates to a microfine particle composite magnetic grinding material made up by abrasive powder, binder and ferromagnet. Said grinding material not only possesses the good magnetic permeability, but also has the strong cutting property and polishing action. It is simple in preparation process and low in cost, its working quality is stable, so that it is mainly used for precision burnishing various formed surfaces, shaped curved surfaces and surfaces of various small parts with different-size channels.

Description

Magnetic grinding tool and preparation thereof
Magnetic grinding tool of the present invention and preparation thereof belong to machine components precision surface polishing machining technology.Specifically, relate to a kind of material preparation of magnetically grinding and the category of process technology thereof.
Along with improving constantly of mechanical product quality, press for the problem of solution, improve the surface quality of part exactly, effectively improve the serviceability of part, prolong the part purpose in service life to reach.And the shape of part is Protean, and owing to material difference, different, complex structure, the Surface Finishing problem of many parts is difficult to solve.Thereby, restricted the further raising of product quality.At present, some different in nature piece surfaces, have the fine finishining of the inside and outside circle piece surface of various tiny grooves, can only adopt manual method to finish, working (machining) efficiency is low, the crudy instability, and labor strength is big, and environmental pollution is serious.Therefore, solve the surface quality problems of these parts, then become major subjects anxious to be captured.
At present, the magnetically grinding process technology successfully is applied to many high-technology fields, the purpose that can realize removing burr, improves surface quality of workpieces.For example, the correct grinding processing of the inwall grinding of stainless steel air cleaning bottle, the grinding of plastic lens, thin and long shafts pottery, and the polishing processing of piece surfaces such as hydraulic efficiency slide valve, middle-convex and varying ellipse all-aluminium piston, bearer ring and Internal and external cycle track, use in sewing machine opposite sex finding, various complex cutting tools and remove burr, solved the quality problems of piece surface.
Yet as the important component part of magnetically grinding process technology, magnetic grinding tool can't be manufactured in China, and the preparation technology of magnetic grinding tool and technology of preparing still belong to blank.In the world, also have only a few countries such as Japan, Bulgaria to develop magnetic grinding tool, and can small lot batch manufacture.Production method mainly is a sintering process, and the raw material of employing has: (1) has the ferromagnet (straight iron powder) of good magnetic property, and (2) have the abrasive powder (aluminium oxide, carborundum etc.) of strong cutting power.Processing technology is as follows: after straight iron powder (80%) and aluminium oxide or the even mixing of carborundum (20%); be pressed into blank; send into vacuum then or be connected with in the sealing sintering furnace of inert protective gas; under the pressure of 1300 ℃ high temperature and 5MPa; behind the sintering certain hour, through pulverizing, screen the acquisition product.Its structure is to be evenly distributed in the ferromagnet with small abrasive grain, forms the magnetic abrasive grain particle swarm of certain size.This technology, since all very high to the requirement of sintering temperature, sintering time, sintering atmosphere and powder property, and need high temperature, high-tension apparatus, having caused complex process, operating difficulties, production environment is poor.Simultaneously production cost is very high, and every kilogram up to 850 yuans, is difficult to apply.
The purpose of magnetic grinding tool of the present invention and preparation thereof is:
1 fills up the domestic blank of this product of magnetic grinding tool, fully import substitutes;
2 realize various inner and outer round surface, profiled surface, different in nature curved surfaces, have the aluminum alloy part of the tiny groove of different size and other with conventional method can't accurately machined piece surface precise finiss processing;
3 effectively reduce the surface roughness value of part, remove the seamed edge burr, improve the piece surface stress state, improve piece surface hardness, thereby surface engagement, surface conductivity, face seal and the service life of part are greatly improved;
4 promote the rapid popularization of magnetically grinding process technology, and the polishing processing method that some tradition are fallen behind updates, and impels new technology with the mode of production of modern civilization, the popularization of new technology and application;
5 provide a kind of makes that technology is simple, low production cost, working (machining) efficiency height, processing effect are good, be easy to realize the method for making and the process technology thereof of the magnetic grinding tool produced in enormous quantities;
6 have certain competitiveness in international market, further after the developmental research, can squeeze into the international market, and obtain good economic benefit and social benefit, for country creates the foreign exchange income.
Magnetic grinding tool of the present invention is characterized in that it being a kind of particulate composite magnetic grinding-material of mainly being made up of abrasive powder, bond and ferromagnet, particle size range (60-140) #Its component is: abrasive powder (16-19) %, particle size range (300400) #And micro mist, high-temperature-resistant epoxy resin (5-7.5) %, silicones (2.5-4) %, curing agent (1.3-2.3) %, straight iron powder (66.8-74) %, particle size range is (140-200) #, all the other are impurity.Preparation technology is as follows:
(I) the first, strict selected ferromagnetic material and abrasives, ferromagnet granularity (140-200) #, mill section powder degree (300-400) #And micro mist, and granularity requirements is even; The second, bond is answered anti-300 ℃ high temperature; (II) is 1: 4 by abrasive powder and ferromagnet weight ratio, respectively two kinds of materials of weighing; (III) packs load weighted two kinds of materials in the cartridge of mixing equipment, and sealed feed inlet mixes (6-10) hour with the rotating speed of (10-20) r/min; The preparation of (IV) bond, at first the ratio by bond weight and compound weight is the gross weight of calculations incorporated agent in 2: 15, and then by 2: 1: 0.5 weight ratio weighing epoxy resin, silicones and curing agent three components respectively, uniformly mixes; (V) poured the bond and the compound that mix in one bulk container into, and it is moistening fully evenly to be stirred to compound and bond, when combining together, is made into the bulk piece of diameter for (30-50) mm; The bulk piece that it is good that (VI) will bond is positioned in the environment of drying, lucifuge, and applies the pressure of (0.1-0.3) MPa, at room temperature solidifies about 24 hours; (VII) utilizes disintegrating apparatus to pulverize, and with the standard screen cloth it pressed instructions for use then, divides and hanks 60 #, 80 #, 100 #, 120 #, 140 #Granularity series, get final product with the requirement of satisfying rough lapping processing, the processing of half smooth grinding and precise finiss processing.
The magnetic grinding tool that the present invention makes, the main distinction are to have increased a kind of bond than sintering grinding tool in the raw-material selection.Even now, the existence of this bond but has the important function of following two aspects.First, the ferromagnet and the abrasive powder that mix are bonded to an integral body, abrasive grain is uniformly distributed in the ferromagnet, thereby substituted the complex techniques process of vacuum or protective gas sintering, simplified operational procedure, save high temperature, high-tension apparatus, thereby reduced production cost significantly; The second, this bond itself has good polishing action, makes the glossiness of processing back surface of the work and brightness significantly better than the sintering grinding tool.
The magnetic grinding tool that the present invention makes, process equipment by means of magnetically grinding, realized the surface accurate attrition process of inner and outer round surface, profiled surface, different in nature curved surface, the micro parts surface that has different size and shape groove, seamed edge to machine components and various fillet armpit portion and removed burr, processing effect is good.The processing back Part Surface Roughness value 2-3 level that can descend on the original basis, R aValue has reached below the 0.2 μ m, and is also very desirable for the burr removal effect of groove seamed edge, pit surface.And production technology is simple, low production cost, and 160 yuans every kilogram, price is less than 1/5th of import magnetic grinding tool.
Most preferred embodiment of the present invention
Preparation example 1 is weighing in 1: 4 by the weight ratio of abrasive powder and straight iron powder at first: 300 #0.1 kilogram in aluminium oxide, 140 #0.4 kilogram of straight iron powder carried out even batch mixing 6 hours; The weight of each component of weighing bond then: 0.038 kilogram of high-temperature-resistant epoxy resin, 0.019 kilogram of silicones, 0.0095 kilogram in curing agent, be stirred well to when not having muscle shape thing to exist, pour into compound again, evenly stir up to compound by complete moistening can the bonding, at room temperature add 0.2MPa then and solidified 24 hours, crushing and screening is 60 #, 80 #Two kinds of granularities.Be used for rough lapping processing and the processing of half smooth grinding.
Preparation example 2 is weighing in 1: 4 by the weight ratio of abrasive powder and straight iron powder at first: 400 #0.5 kilogram in aluminium oxide, 180 #2 kilograms of straight iron powders carried out even batch mixing 7 hours; The weight of each component of weighing bond then: 0.19 kilogram of high-temperature-resistant epoxy resin, 0.095 kilogram of silicones, 0.048 kilogram in curing agent, be stirred well to when not having muscle shape thing to exist, pour into compound again, evenly stir up to compound by complete moistening can the bonding, the 0.3MPa that at room temperature pressurizes then solidified 24 hours, and crushing and screening is 100 #, 120 #Two kinds of granularities.Be used for precise finiss processing.
Preparation example 3 is weighing in 1: 4 by the weight ratio of abrasive powder and straight iron powder at first: 0.25 kilogram in W20 carborundum, 200 #1 kilogram of straight iron powder, carried out even batch mixing 6 hours; The weight of each component of weighing bond then: 0.095 kilogram of high-temperature-resistant epoxy resin, 0.05 kilogram of silicones, 0.024 kilogram in curing agent, be stirred well to when not having muscle shape thing to exist, pour into compound again, evenly stir up to compound by complete moistening can the bonding, the 0.2MPa that at room temperature pressurizes then solidified 24 hours, and it is 120 that crushing and screening becomes granularity #, 140 #Two kinds.Be used for fine abrasive processing.
The processing of processing instance 1 surface of the work polishing
Experiment condition
Workpiece material and specification Hardened steel φ=40mm l=260mm
Initial roughness Ra=1.1μm
Ci grinding tool and specification AI 2O 3Series 100 #(149μm)
Additive No. 1 additive
Experimental data
Process time Machining gap Magnetic induction intensity The workpiece speed of related movement The relative vibration amplitude of workpiece The relative vibration frequency of workpiece
t=3min △=3mm ??B=1.2T ?V=76.7m/min ????a=15mm ????f=2.3Hz
Processing effect: processing back workpiece surface roughness value Ra=0.22 μ m, and surface-brightening, satisfactory mechanical property.
Processing instance 2 surface of the works are removed burr
Workpiece material and specification: precision aluminium-alloy outer round surface φ * 1=15 * 50 (mm)
Processing request: remove the burr (totally 6 places) of different size groove seamed edge, the size of groove is as follows: B * L=2 * 30 (mm), 4 * 15 (mm), the groove end has the small sircle hole that diameter is 4mm.
Processing effect: process totally 10 minutes process time behind the preferred machined parameters.Processing back piece surface light, each flute surfaces, circular hole surface burr are all removed, and are not destroyed the geometric accuracy of the original precision surface of part.
By various processing characteristics test experiments checkings and user's applicating evaluating, magnetic grinding tool of the present invention and preparation thereof mainly have following advantages:
1 in the magnetic field device of magnetically grinding process equipment, has very strong magnetic property, and the grinding pressure of generation is also very large, so metal removal rate is large, and working (machining) efficiency is high;
2 owing to do not need special installation, and production technology simple, with short production cycle, less demanding to workman's technical merit, be easy to realize producing in enormous quantities, so product cost is low, has the competitiveness of stronger domestic and international market.
3 without burn into without waste liquid, pollution-free, production environment is good; Because do not need sintering and the cooling device of highly energy-consuming, therefore save the energy simultaneously, be beneficial to environmental protection;
4 have solved the difficult problem of some part high accuracy processing methods, can substitute to a certain extent existing manual production mode, alleviate workman's labour intensity, improve workman's working environment;
After 5 processing not only the surface roughness of part can effectively descend more than the two-stage, Ra value reaches below the 0.2 μ m, therefore mechanical performance is also significantly better than before the processing, the surface quality of part height after the processing; And, because the peculiar polishing action of bond makes glossiness, the brightness of the rear piece surface of processing be better than the import grinding tool.

Claims (5)

1 one kinds of magnetic grinding tools is characterized in that it being a kind of particulate composite magnetic grinding-material of mainly being made up of abrasive powder, bond and ferromagnet, and granularity is (60-140) #, its component is: abrasive powder (16-19) %, and high-temperature-resistant epoxy resin (5-7.5) %, silicones (2.5-4) %, curing agent (1.3-2.3) %, straight iron powder (66.8-74) %, all the other are impurity.
2 according to the described a kind of magnetic grinding tool of claim 1, it is characterized in that preparation technology is: (I) the first, strict selected ferromagnetic material and abrasive powder material, ferromagnet granularity (140-200) #, abrasive powder granularity (300-400) #And micro mist, and granularity requirements is even; The second, bond is answered anti-300 ℃ high temperature; (II) is 1: 4 by abrasive powder and ferromagnet weight ratio, respectively two kinds of materials of weighing; (III) packs load weighted two kinds of materials in the cartridge of mixing equipment, and sealed feed inlet mixes (6-10) hour with the rotating speed of (10-20) r/min; The preparation of (IV) bond, at first the ratio by bond weight and compound weight is the gross weight of calculations incorporated agent in 2: 15, and then by 2: 1: 0.5 weight ratio weighing epoxy resin, silicones and curing agent three components respectively, uniformly mixes; (V) poured the bond and the compound that mix in one bulk container into, and it is moistening fully evenly to be stirred to compound and bond, when combining together, is made into the bulk piece of diameter for (30-50) mm; The bulk piece that it is good that (VI) will bond is positioned in the environment of drying, lucifuge, and applies the pressure of (0.1-0.3) MPa, at room temperature solidifies about 24 hours; (VII) utilizes disintegrating apparatus to pulverize, and with the standard screen cloth it pressed instructions for use then, divides and hanks 60 #, 80 #, 100 #, 120 #, 140 #Granularity series, get final product with the requirement of satisfying rough lapping processing, the processing of half smooth grinding and precise finiss processing.
3 preparation technologies according to the described a kind of magnetic grinding tool of claim 2 is characterized in that the material of abrasive powder has: aluminium oxide, carborundum and diamond, granularity are (300-400) #And micro mist.
4 preparation technologies according to the described a kind of magnetic grinding tool of claim 2 is characterized in that ferromagnetic material is a straight iron powder, and granularity is (140-200) #
5 preparation technologies according to the described a kind of magnetic grinding tool of claim 2, it is characterized in that the raw material of bond is: resistant to elevated temperatures epoxy resin, silicones and curing agent, the weight ratio of three components are 2: 1: 0.5.
CN00135667A 2000-12-17 2000-12-17 Magnetic grinding tool and its preparation Expired - Fee Related CN1097504C (en)

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CN1097504C CN1097504C (en) 2003-01-01

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103111918A (en) * 2013-01-17 2013-05-22 辽宁科技大学 Method for finishing upper groove and narrow slit of workpiece
CN104669132A (en) * 2015-02-11 2015-06-03 太原理工大学 Viscoelastic magnetic grinding tool and preparation method thereof
CN106271968A (en) * 2016-11-09 2017-01-04 南华大学 A kind of magnetorheological elastic polished take turns, small-bore aspherical mirror machining device and method
CN106695588A (en) * 2016-11-30 2017-05-24 淄博理研泰山涂附磨具有限公司 Magnetic tray pad and preparation method thereof
CN108611057A (en) * 2018-05-16 2018-10-02 西安思源学院 A kind of exceptional hardness magnetic abrasive grain and preparation method thereof
CN109574638A (en) * 2018-12-29 2019-04-05 山东天汇研磨耐磨技术开发有限公司 A kind of high-bond ceramics section and its manufacturing method applying metal-rubber

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU737203A1 (en) * 1976-06-15 1980-05-30 Ордена Трудового Красного Знамени Институт Проблем Материаловедения Ан Украинской Сср Method of manufacturing magnetic-abrasive material
SU703321A1 (en) * 1977-01-28 1979-12-15 Физико-технический институт АН Белорусской ССР Material for magnetic-abrasion working
SU1763161A1 (en) * 1990-02-08 1992-09-23 Физико-технический институт АН БССР Material for magnetic-abrasive treatment
CN1100982A (en) * 1993-06-24 1995-04-05 株式会社今桥制作所 Magnetic barrel finishing machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103111918A (en) * 2013-01-17 2013-05-22 辽宁科技大学 Method for finishing upper groove and narrow slit of workpiece
CN104669132A (en) * 2015-02-11 2015-06-03 太原理工大学 Viscoelastic magnetic grinding tool and preparation method thereof
CN104669132B (en) * 2015-02-11 2017-01-18 太原理工大学 Viscoelastic magnetic grinding tool and preparation method thereof
CN106271968A (en) * 2016-11-09 2017-01-04 南华大学 A kind of magnetorheological elastic polished take turns, small-bore aspherical mirror machining device and method
CN106271968B (en) * 2016-11-09 2018-06-26 南华大学 A kind of magnetorheological elastic polished wheel, small-bore aspherical mirror machining device and method
CN106695588A (en) * 2016-11-30 2017-05-24 淄博理研泰山涂附磨具有限公司 Magnetic tray pad and preparation method thereof
CN108611057A (en) * 2018-05-16 2018-10-02 西安思源学院 A kind of exceptional hardness magnetic abrasive grain and preparation method thereof
CN109574638A (en) * 2018-12-29 2019-04-05 山东天汇研磨耐磨技术开发有限公司 A kind of high-bond ceramics section and its manufacturing method applying metal-rubber

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