CN103465347A - 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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- CN103465347A CN103465347A CN2013104361818A CN201310436181A CN103465347A CN 103465347 A CN103465347 A CN 103465347A CN 2013104361818 A CN2013104361818 A CN 2013104361818A CN 201310436181 A CN201310436181 A CN 201310436181A CN 103465347 A CN103465347 A CN 103465347A
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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 the 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 polishing processing, not only keep 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 is in the market made of the surface of stainless steel nitriding usually, but the service life of this sand cylinder is shorter, and have various contaminant metal ions material, the powder color becomes ash, blackening, causes product quality defective seriously the time, can only the material of workhardness (Mohs) below 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 ground sharply increase, reach 80 ℃ of left and right, well-known, the softening temperature of polyurethane is only 80 ℃, therefore, at this moment cause and can't continue to grind simultaneously, part polyurethane can be melting into material, after drying materials, there will be the polyurethane of big particle to be mixed among powder, product purity is descended, even the powder of processing is scrapped.
Pure carborundum is water white crystal.Industry carborundum is different with content because of the kind of impurities, and is pale yellow, green, indigo plant and even black, and transparency is different and different with its purity.The silicon carbide whisker body structure is divided into six sides or rhombohedral α-SiC and cubical β-SiC(and claims cubic silicon carbide).α-SiC forms many different variants because the stacking sequence of carbon in its crystal structure and silicon atom is different, has found that more than 70 plant.β-SiC changes α-SiC in time more than 2100 ℃.
The industrial making method of carborundum is to refine in resistance furnace with high grade quartz sand and petroleum coke.Refine silicon carbide bulk, through broken, soda acid is washed, magnetic separation and screening or wet concentration and make the product of various granularities.
Carborundum has black silicon carbide and two these kinds of base commonly used of green silicon carbide, all belongs to α-SiC.
1. black silicon carbide is containing SiC approximately 95%, and its toughness is higher than green silicon carbide, mostly for processing the material that tensile strength is low, as glass, pottery, stone material, refractory material, cast iron and non-ferrous metal etc.
2. approximately more than 97%, self-sharpening is good containing SiC for green silicon carbide, mostly for processing rigid alloy, titanium alloy and optical glass, also for grinding cylinder sleeve and fine grinding high-speed steel tool.Also have in addition cubic silicon carbide, it is the yellow green crystal of producing with special process, is suitable for the microstoning of bearing in order to the grinding tool of making, and 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 the hardest in the world diamond (10 grades), 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 use, also have a lot of other purposes, for example: with special process, silicon carbide powder is coated to the inwall of turbine impeller or cylinder block, can be improved its wearability and increase the service life 1～2 times; In order to the high grade refractory of making, resistance to thermal shock, volume is little, lightweight and intensity is high, good energy-conserving effect.Low grade carborundum (containing SiC approximately 85%) is fabulous deoxidier, can accelerate steel-making speed with it, and be convenient to control chemical composition, the quality of raising steel.
But, on domestic and international market, do not occur at present carbofrax material is applied to the relevant open source literature in the making of sand cylinder.
Summary of the invention
Problem to be solved by this invention is in order to overcome existing grinding drum insufficient strength, defect that abrasion resistance is inadequate, and the manufacture method of carborundum grinding drum in a kind of milling apparatus that can improve grinding drum intensity and abrasion resistance is provided.
In order to address the above problem, the present invention by the following technical solutions:
The manufacture method of carborundum grinding drum in a kind of milling apparatus comprises the following steps:
1), batching
Carborundum is added to catalysts and additive, add while stirring water, pulp or granular material stir;
2, forming of green body
Adopt mould to produce the biscuit of the carborundum grinding drum of dimension size by injection forming or isostatic compaction etc. pulpous state or granular material;
3), the drying of biscuit, repairing and sintering:
Biscuit is carried out to drying, and dried biscuit places under repair, and in the vacuum drying oven of after repairing, biscuit being packed into, adds silicon alloy to carry out sintering;
4), the fine finishining of product after 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 optimize: in above-mentioned steps 1, the proportioning of described various component weight is:
65～75 parts, carborundum, 5～15 parts of catalysts, 10～30 parts of additives; Water is appropriate.
Further optimize: the main component of described catalysts is powdered carbon; The main component of additive is polyvinyl alcohol and two propyl alcohol.
Further optimize: in above-mentioned steps 1, the material after batching is pulpous state or powdery.
Further optimize: in above-mentioned steps 3, dried biscuit moisture accounts for 3～12% of gross mass.
Further optimize: in above-mentioned steps 3, the vacuum of vacuum drying oven is 50Pa.
Further optimize: in above-mentioned steps 3, biscuit is packed in vacuum drying oven and added silicon alloy sintering in the temperature of 1800～2100 degree of biscuit weight 30～70%, following chemical reaction mainly occurs in the process of sintering:
αSIC＋C→βSIC；
C＋Si→αSIC＋βSIC。
Further optimize: during the vacuum drying oven sintering, first biscuit is put into to vacuum drying oven, then be evacuated to 50Pa, then slowly be warming up to 500 degrees centigrade in 5 hours, and then slowly be warming up to 1000 degrees centigrade in 10 hours, and then slowly be warming up to 1500 degrees centigrade in 10 hours, and then slowly be warming up to 1800-2100 degree centigrade in 5 hours, keep 10 hours after being warming up to 1800-2100 degree centigrade, finally in 10 hours, slowly be down to normal temperature.
Further optimize: in above-mentioned steps 4, during fine finishining, by the internal diameter size of product size be controlled at 0.2 millimeter size Control with interior, 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 stable, the grinding drum after sintering mainly consists of this material.The carborundum grinding drum of making not only has good abrasion resistance performance, and hardness is high, and the specification precision is high, long service life.
Below in conjunction with the drawings and specific embodiments, invention is described further.
The accompanying drawing explanation
The corresponding diagram that accompanying drawing 1 is biscuit temperature and time during sintering in vacuum drying oven in the embodiment of the present invention.
the specific embodiment
Embodiment 1, and the manufacture method of carborundum grinding drum in a kind of milling apparatus comprises the following steps:
1), batching
Carborundum is added to catalysts and additive, add while stirring water, stir, the proportioning of described various component weight is:
65 parts, carborundum, 5 parts of catalysts, 10 parts of additives; 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 adding water, the material after batching can be made into pulpous state or powdery.
2, forming of green body
Adopt mould to produce 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:
According to the requirement of drawing, biscuit is carried out to drying, dried biscuit places under repair, and dried biscuit moisture is controlled at 3～12% of gross mass;
Silicon alloy sintering in the temperature of 1800～2100 degree that biscuit is packed in vacuum drying oven and added biscuit weight 30～70%;
As shown in Figure 1, during the vacuum drying oven sintering, first biscuit is put into to vacuum drying oven, then be evacuated to 50Pa, then slowly be warming up to 500 degrees centigrade in 5 hours, and then slowly be warming up to 1000 degrees centigrade in 10 hours, and then slowly be warming up to 1500 degrees centigrade in 10 hours, and then slowly be warming up to 1800-2100 degree centigrade in 5 hours, and keep 10 hours after being warming up to 1800-2100 degree centigrade, finally in 10 hours, slowly be down to normal temperature.
Following chemical reaction mainly occurs in the process of sintering:
Generate β SIC 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 product after sintering: the carborundum grinding drum after sintering is arranged on numerical control machining center and carries out fine finishining, by the internal diameter size of product size be controlled at 0.2 millimeter size Control with interior, product external diameter within 5 decimillimeters, the fineness of product can reach 1.6, guarantees product compactness when mounted.
Embodiment 2, and in the step 1 of above-described embodiment 1, the proportioning of described various component weight can also be: 75 parts, carborundum, 15 parts of catalysts, 30 parts of additives; Water is appropriate, and other processing step is identical with embodiment 1.
Embodiment 3, and in the step 1 of above-described embodiment 1, the proportioning of described various component weight is: 70 parts, carborundum, 10 parts of catalysts, 20 parts of additives; 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 stable, the grinding drum after sintering mainly consists of this material.The present invention adopts such scheme, and the carborundum grinding drum of making not only has good abrasion resistance performance, and hardness is high, and the specification precision is high, long service life.
On carborundum grinding drum and existing market, the performance of other material grinding drum is compared 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 | 10 | Better | 1 year |
| Stainless steel | 700～1000 | 14～17 | Generally | 1～2 year |
Claims (9)
1. the manufacture method of carborundum grinding drum in a milling apparatus is characterized in that: comprise the following steps:
1), batching
Carborundum is added to catalysts and additive, add while stirring water, pulp or granular material stir;
2), forming of green body
Adopt mould to produce the biscuit of the carborundum grinding drum of dimension size by injection forming or hydrostatic profile etc. pulpous state or granular material;
3), the drying of biscuit, repairing and sintering:
Biscuit is carried out to drying, and dried biscuit places under repair, and in the vacuum drying oven of after repairing, biscuit being packed into, adds silicon alloy to carry out sintering;
4), the fine finishining of product after 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, 5～15 parts of catalysts, 10～30 parts of additives; Water is appropriate.
3. the manufacture method of carborundum grinding drum in a kind of milling apparatus according to claim 1 and 2, it 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 or 5, it is characterized in that: in above-mentioned steps 3, the vacuum of vacuum drying oven is 50Pa.
7. the manufacture method of carborundum grinding drum in a kind of milling apparatus according to claim 6, it is characterized in that: in above-mentioned steps 3, silicon alloy sintering in the temperature of 1800～2100 degree that biscuit is packed in vacuum drying oven and added biscuit weight 30～70%, following chemical reaction mainly occurs in the process of sintering:
αSIC＋C→βSIC；
C＋Si→αSIC＋βSIC。
8. the manufacture method of carborundum grinding drum in a kind of milling apparatus according to claim 7, it is characterized in that: during the vacuum drying oven sintering, first biscuit is put into to vacuum drying oven, then be evacuated to 50Pa, then slowly be warming up to 500 degrees centigrade in 5 hours, and then slowly be warming up to 1000 degrees centigrade in 10 hours, and then slowly be warming up to 1500 degrees centigrade in 10 hours, and then slowly be warming up to 1800-2100 degree centigrade in 5 hours, keep 10 hours after being warming up to 1800-2100 degree centigrade, finally in 10 hours, slowly be down to normal temperature.
9. 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, by the internal diameter size of product size be controlled at 0.2 millimeter size Control with interior, product external diameter within 5 decimillimeters, the fineness of product reaches 1.6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105777131A (en) * | 2016-02-15 | 2016-07-20 | 山东宝纳新材料有限公司 | Threaded silicon carbide ceramic composite material grinding barrel 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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| CN2402445Y (en) * | 1999-12-01 | 2000-10-25 | 斗沅化工有限公司 | Structure of grinding drum |
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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 |
| JPH07187807A (en) * | 1992-03-23 | 1995-07-25 | Ngk Insulators Ltd | Source material for press forming of sic sintered body and press forming 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 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105777131A (en) * | 2016-02-15 | 2016-07-20 | 山东宝纳新材料有限公司 | Threaded silicon carbide ceramic composite material grinding barrel and preparation method |
| 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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