CN103465347B - Manufacturing method for silicon carbide grinding barrel in grinding equipment - Google Patents
Manufacturing method for silicon carbide grinding barrel in grinding equipment Download PDFInfo
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- CN103465347B CN103465347B CN201310436181.8A CN201310436181A CN103465347B CN 103465347 B CN103465347 B CN 103465347B CN 201310436181 A CN201310436181 A CN 201310436181A CN 103465347 B CN103465347 B CN 103465347B
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Abstract
The invention discloses a manufacturing method for a silicon carbide grinding barrel in grinding equipment. The manufacturing method comprises the following steps of firstly, batching: adding a reaction catalyst and an additive into silicon carbide, adding water while stirring and uniformly stirring to form slurry or powdery materials; secondly, molding a biscuit: producing the slurry or powdery materials into the biscuit of the silicon carbide grinding barrel with the corresponding specification and size by adopting a die through molding by slip casting or isostatic pressing molding; thirdly, drying, repairing and sintering the biscuit: drying the biscuit, repairing the dried biscuit, feeding the repaired biscuit into a vacuum furnace and adding a silicon alloy for sintering; fourthly, performing finish machining: mounting the sintered silicon carbide grinding barrel on a numeric control machining center for finish machining. The silicon carbide grinding barrel produced by the manufacturing method disclosed by the invention has the advantages of excellent wear-resistance performance, high hardness, high size precision and long service life.
Description
technical field
The present invention relates to the manufacture method of carborundum grinding drum in a kind of milling apparatus, belong to silicon carbide articles technical field.
Background technology
Grinder be applicable to the various parts of metal, non-ferrous metal and on-metallic article deburring, derust, rounding and brilliant polish.Be specially adapted to the surface finishing of yielding workpiece, the part after this type grinder skin processing, not only keeps original accuracy of form and position, and can improve Part Surface Roughness 1-2 level.
Sand cylinder is the important composition parts of grinder, the sand cylinder occurred in the market makes of surface of stainless steel nitriding usually, but the service life of this sand cylinder is shorter, and have various contaminant metal ions material, powder color become ash, blackening, seriously time cause product quality defective, can only the material of workhardness (Mohs) less than 5 grades.
The employing polyurethane also had, as inner lining material, more a little better than previous steel lining, but, because the heat dispersion of polyurethane is poor, make the temperature of charge of grinding sharply increase, reach about 80 DEG C, as everyone knows, the softening temperature of polyurethane is only 80 DEG C, therefore, at this moment cause and cannot continue grinding simultaneously, some polyurethanes can be melting into material, after drying materials, the polyurethane that there will be big particle is mixed among powder, and product purity is declined, and even processed powder is scrapped.
Pure carborundum is water white crystal.Industry carborundum because of the kind of impurities different with content, and in pale yellow, green, blue and even black, transparency is different with its purity difference.Silicon carbide whisker body structure is divided into six sides or rhombohedral α-SiC and cubical β-SiC(to claim cubic silicon carbide).α-SiC is different with the stacking sequences of silicon atom and form many different variants due to carbon in its crystal structure, has found that more than 70 plant.β-SiC changes α-SiC in more than 2100 DEG C time.
The industrial making method of carborundum refines in resistance furnace with high grade quartz sand and petroleum coke.The silicon carbide bulk of refining, through broken, soda acid is washed, magnetic separation and screening or wet concentration and make the product of various granularity.
Carborundum has black silicon carbide and conventional this kind of base of green silicon carbide two, all belongs to α-SiC.
1. black silicon carbide is containing SiC about 95%, and its toughness, higher than green silicon carbide, is used for greatly processing the low material of tensile strength, as glass, pottery, stone material, refractory material, cast iron and non-ferrous metal etc.
2. green silicon carbide is containing SiC about more than 97%, and self-sharpening is good, is used for greatly processing rigid alloy, titanium alloy and optical glass, also for grinding cylinder sleeve and fine grinding high-speed steel tool.In addition also have cubic silicon carbide, it is the yellow-green crystal produced with special process, and the grinding tool in order to make is suitable for the microstoning of bearing, can make surface roughness from Ra32 ~ 0.16 micron time processing to Ra0.04 ~ 0.02 micron.
The hardness of carborundum is very large, Mohs' hardness is 9.5 grades, be only second to diamond (10 grades) the hardest in the world, carborundum due to stable chemical performance, thermal conductivity factor is high, thermal coefficient of expansion is little, anti-wear performance is good, except making abrasive material and using, also have other purposes a lot, such as: the inwall with special process, silicon carbide powder being coated turbine impeller or cylinder block, its wearability can be improved and increase the service life 1 ~ 2 times; In order to the high grade refractory made, resistance to thermal shock, volume are little, lightweight and intensity is high, good energy-conserving effect.Low grade carborundum (containing SiC about 85%) is fabulous deoxidier, can accelerate steel-making speed with it, and is convenient to control chemical composition, improves the quality of steel.
But, current domestic and international market there is not the relevant open source literature be applied to by carbofrax material in the making of sand cylinder.
Summary of the invention
Problem to be solved by this invention is to overcome existing grinding drum insufficient strength, defect that abrasion resistance is inadequate, providing a kind of manufacture method that can improve carborundum grinding drum in the milling apparatus of grinding drum intensity and abrasion resistance.
In order to solve the problem, the present invention by the following technical solutions:
A manufacture method for carborundum grinding drum in milling apparatus, comprises the following steps:
1), prepare burden
Carborundum is added catalysts and additive, add water while stirring, stir pulp or granular material;
2, forming of green body
Mould pulpous state or granular material is adopted to be produced the biscuit of the carborundum grinding drum of dimension size by injection forming or isostatic compaction etc.;
3), the drying of biscuit, repairing and sintering:
Biscuit is carried out drying, and dried biscuit places under repair, and is loaded in vacuum drying oven by biscuit to add silicon alloy and sinter after repairing;
4), the fine finishining of the rear product of sintering: the carborundum grinding drum after sintering is arranged on numerical control machining center and carries out fine finishining.
Below the further optimization of the present invention to such scheme:
Further optimization: in above-mentioned steps 1, the proportioning of described various component weight is:
65 ~ 75 parts, carborundum, catalysts 5 ~ 15 parts, additive 10 ~ 30 parts; Water is appropriate.
Further optimization: the main component of described catalysts is powdered carbon; The main component of additive is polyvinyl alcohol and two propyl alcohol.
Further optimization: in above-mentioned steps 1, the material after batching is pulpous state or powdery.
Further optimization: in above-mentioned steps 3, dried biscuit moisture accounts for 3 ~ 12% of gross mass.
Further optimization: in above-mentioned steps 3, the vacuum of vacuum drying oven is 50Pa.
Further optimization: in above-mentioned steps 3, biscuit being loaded in vacuum drying oven the silicon alloy adding biscuit weight 30 ~ 70% and sinter in the temperature of 1800 ~ 2100 degree, mainly there is following chemical reaction in the process of sintering:
αSIC＋C→βSIC；
C＋Si→αSIC＋βSIC。
Further optimization: during vacuum drying oven sintering, first biscuit is put into vacuum drying oven, then 50Pa is evacuated to, then in 5 hours, 500 degrees Celsius are slowly warming up to, and then 1000 degrees Celsius were slowly warming up in 10 hours, and then 1500 degrees Celsius were slowly warming up in 10 hours, and then slowly 1800-2100 degree Celsius was warming up in 5 hours, keep 10 hours after being warming up to 1800-2100 degree Celsius, finally in 10 hours, be slowly down to normal temperature.
Further optimization: in above-mentioned steps 4, during fine finishining, the internal diameter size of product size is controlled within 0.2 millimeter, the size Control of product external diameter within 5 decimillimeters, the fineness of product reaches 1.6.
The present invention adopts such scheme, carborundum and catalysts and additive and silico-aluminum at high temperature react the compound carborundum of rear main generation, the key property of this material is high temperature resistant, wear-resistant, corrosion-resistant, and the physical characteristic under high temperature is stablized, the grinding drum after sintering is mainly made up of this material.The carborundum grinding drum made not only has excellent abrasion resistance performance, and hardness is high, and specification precision is high, long service life.
Below in conjunction with the drawings and specific embodiments, invention is described further.
Accompanying drawing explanation
Accompanying drawing 1 is the corresponding diagram of temperature and time when biscuit sinters in a vacuum furnace in the embodiment of the present invention.
Detailed description of the invention
Embodiment 1, the manufacture method of carborundum grinding drum in a kind of milling apparatus, comprises the following steps:
1), prepare burden
Carborundum is added catalysts and additive, add water while stirring, stir, the proportioning of described various component weight is:
65 parts, carborundum, catalysts 5 parts, additive 10 parts; Water is appropriate;
Carborundum, catalysts and additive are prepared burden with granular powder, the size of particle is between 2 microns to 150 microns, wherein the main component of catalysts is powdered carbon, the main component of additive is polyvinyl alcohol and two propyl alcohol, according to the difference of the amount of interpolation water, the material after batching can be made into pulpous state or powdery.
2, forming of green body
Mould is adopted to be produced the biscuit of the carborundum grinding drum of dimension size by injection forming or isostatic compaction etc.;
The main material form of injection forming is pulpous state, and the main material form of isostatic compaction is powdery.
3), the drying of biscuit, repairing and sintering:
Biscuit is carried out drying by the requirement according to drawing, and dried biscuit places under repair, and dried biscuit moisture controls in 3 ~ 12% of gross mass;
Biscuit is loaded in vacuum drying oven the silicon alloy adding biscuit weight 30 ~ 70% to sinter in the temperature of 1800 ~ 2100 degree;
As shown in Figure 1, during vacuum drying oven sintering, first biscuit is put into vacuum drying oven, then be evacuated to 50Pa, then in 5 hours, be slowly warming up to 500 degrees Celsius, and then be slowly warming up to 1000 degrees Celsius in 10 hours, and then 1500 degrees Celsius were slowly warming up in 10 hours, and then slowly 1800-2100 degree Celsius was warming up in 5 hours, keep 10 hours after being warming up to 1800-2100 degree Celsius, finally in 10 hours, be slowly down to normal temperature.
Mainly there is following chemical reaction in the process of sintering:
β SIC is generated through catalyst reaction under α SIC high temperature.
C in catalyst at high temperature reacts with silicon alloy and generates α SIC and β SIC.
αSIC＋C→βSIC；
C＋Si→αSIC＋βSIC。
4), the fine finishining of the rear product of sintering: the carborundum grinding drum after sintering is arranged on numerical control machining center and carries out fine finishining, the internal diameter size of product size is controlled within 0.2 millimeter, the size Control of product external diameter within 5 decimillimeters, the fineness of product can reach 1.6, ensures product compactness when mounted.
Embodiment 2, in the step 1 of above-described embodiment 1, the proportioning of described various component weight can also be: 75 parts, carborundum, catalysts 15 parts, additive 30 parts; Water is appropriate, and other processing step is identical with embodiment 1.
Embodiment 3, in the step 1 of above-described embodiment 1, the proportioning of described various component weight is: 70 parts, carborundum, catalysts 10 parts, additive 20 parts; Water is appropriate.Other processing step is identical with embodiment 1.
In above-described embodiment 1-3, carborundum and catalysts and additive and silicon alloy at high temperature react the compound carborundum of rear main generation, the key property of this material is high temperature resistant, wear-resistant, corrosion-resistant, and the physical characteristic under high temperature is stablized, the grinding drum after sintering is mainly made up of this material.The present invention adopts such scheme, and the carborundum grinding drum made not only has excellent abrasion resistance performance, and hardness is high, and specification precision is high, long service life.
On carborundum grinding drum and existing market, the Performance comparision of other material grinding drum is as follows:
| Main material | Serviceability temperature (℃） | Wearability, hardness (HV) | Corrosion resistance | Service life |
| Carborundum | 1380～1600 | 20～22 | Excellent Excellent | 3 ~ 5 years |
| Zirconia | 600～900 | 16～19 | Better | 2 ~ 3 years |
| Resin | 300 times | 10 | Better | 1 year |
| Stainless steel | 700～1000 | 14～17 | Generally | 1 ~ 2 year |
Claims (6)
1. the manufacture method of carborundum grinding drum in milling apparatus, is characterized in that: comprise the following steps:
1), prepare burden
Carborundum is added catalysts and additive, add water while stirring, stir pulp or granular material;
2), forming of green body
Mould pulpous state or granular material is adopted to be produced the biscuit of the carborundum grinding drum of dimension size by injection forming or hydrostatic profile;
3), the drying of biscuit, repairing and sintering:
Biscuit is carried out drying, and dried biscuit places under repair, and is loaded in vacuum drying oven by biscuit to add silicon alloy and sinter after repairing; The vacuum of vacuum drying oven is 50Pa;
Biscuit being loaded in vacuum drying oven the silicon alloy adding biscuit weight 30 ~ 70% to sinter in the temperature of 1800 ~ 2100 degree, mainly there is following chemical reaction in the process of sintering:
αSIC＋C→βSIC；
C＋Si→αSIC＋βSIC；
During vacuum drying oven sintering, first biscuit is put into vacuum drying oven, then 50Pa is evacuated to, then in 5 hours, 500 degrees Celsius are slowly warming up to, and then 1000 degrees Celsius were slowly warming up in 10 hours, and then 1500 degrees Celsius were slowly warming up in 10 hours, and then slowly 1800-2100 degree Celsius was warming up in 5 hours, keep 10 hours after being warming up to 1800-2100 degree Celsius, finally in 10 hours, be slowly down to normal temperature;
4), the fine finishining of the rear product of sintering: the carborundum grinding drum after sintering is arranged on numerical control machining center and carries out fine finishining.
2. the manufacture method of carborundum grinding drum in a kind of milling apparatus according to claim 1, it is characterized in that: in above-mentioned steps 1, the proportioning of described various component weight is:
65 ~ 75 parts, carborundum, catalysts 5 ~ 15 parts, additive 10 ~ 30 parts; Water is appropriate.
3. the manufacture method of carborundum grinding drum in a kind of milling apparatus according to claim 1 and 2, is characterized in that: the main component of described catalysts is powdered carbon; The main component of additive is polyvinyl alcohol and two propyl alcohol.
4. the manufacture method of carborundum grinding drum in a kind of milling apparatus according to claim 3, it is characterized in that: in above-mentioned steps 1, the material after batching is pulpous state or powdery.
5. the manufacture method of carborundum grinding drum in a kind of milling apparatus according to claim 1, it is characterized in that: in above-mentioned steps 3, dried biscuit moisture accounts for 3 ~ 12% of gross mass.
6. the manufacture method of carborundum grinding drum in a kind of milling apparatus according to claim 1, it is characterized in that: in above-mentioned steps 4, during fine finishining, the internal diameter size of product size is controlled within 0.2 millimeter, the size Control of product external diameter is within 5 decimillimeters.
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| CN105777131B (en) * | 2016-02-15 | 2018-07-20 | 山东宝纳新材料有限公司 | A kind of screw-type composite silicon carbide ceramic material grinding drum and preparation method |
| CN111848174A (en) * | 2020-07-30 | 2020-10-30 | 山东中鹏特种陶瓷有限公司 | Method for producing wear-resistant silicon carbide ceramic block based on press machine |
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| JPS6131340A (en) * | 1984-07-20 | 1986-02-13 | 株式会社日立製作所 | Manufacture of ceramic sintered body |
| JP3142359B2 (en) * | 1992-03-23 | 2001-03-07 | 日本碍子株式会社 | Press molding method |
| CN2402445Y (en) * | 1999-12-01 | 2000-10-25 | 斗沅化工有限公司 | Structure of grinding drum |
| CN2933810Y (en) * | 2006-05-16 | 2007-08-15 | 广东科达机电股份有限公司 | Milling-grinding disc |
| CN101182211B (en) * | 2007-11-09 | 2010-06-02 | 浙江大学 | Nano silicon carbide ceramic preparation method |
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