CN1211189C - Method for reducing resin diamond grinding wheel bubble and raising its service life - Google Patents
Method for reducing resin diamond grinding wheel bubble and raising its service life Download PDFInfo
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- CN1211189C CN1211189C CN 02138868 CN02138868A CN1211189C CN 1211189 C CN1211189 C CN 1211189C CN 02138868 CN02138868 CN 02138868 CN 02138868 A CN02138868 A CN 02138868A CN 1211189 C CN1211189 C CN 1211189C
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- grinding wheel
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Abstract
The present invention relates to a method for reducing bubbles of a resin diamond grinding wheel and extending the service life of the resin diamond grinding wheel. Powder fillings are calcined at a high temperature, activated and heated, and then are cooled to a room temperature. The resin diamond grinding wheel is produced by a general powder heat pressing forming method under the conditions that the heat treatment temperature is from 300 to 850 DEG C, the time is from 1 to 6 hours, the atmosphere is air, and the pressure is normal pressure. Because the present invention adopts high temperature calcination heat treatment, on one hand, physical adsorption water and chemically combined water in the powder fillings can be dewatered, and simultaneously, the powder fillings are formed into relatively stable phase structures; on the other hand, fresh surfaces are formed on the surfaces of filling particles. Therefore, bubbles generated in the processes of production and use of the resin diamond grinding wheel are reduced, the bonding strength of the main body of the diamond grinding wheel is improved, and the service life of the main body of the diamond grinding wheel is extended. The present invention is suitable for all resin diamond grinding wheels, such as phenolic grinding wheels, polyimide grinding wheels, Dialok 939p resin grinding wheels, etc.
Description
Technical field
The present invention relates to a kind of process of improved production resin diamond grinding wheel, particularly reduce the resin diamond grinding wheel bubble and improve the method in its service life.
Background technology
Since nineteen twenty-six Bakelite company obtains first phenolic resin skive patent (EP1,537,454) since, along with artificial diamond industrial's the development and the extensive use of resin wheel, resin dedicated also having obtained of resin diamond grinding wheel develops rapidly, occurred epoxy resin, Lauxite, polyester, Maranyl etc. in succession.But facts have proved that these resins are not suitable for making resin diamond grinding wheel, its shortcoming is these resin poor heat resistance, and when temperature surpassed 150 ℃, mechanical strength was low, and emery wheel is of low quality etc.The existing used bond of skive is mainly phenolic resins, phenolic resins must add the curing agent methenamine when solidifying, owing in solidification process, can produce ammonia or other little molecule volatile matters, if exhaust is improper, unavoidably in the emery wheel tissue, there is small pore to exist, sometimes also produce air pocket, cause emery wheel to become waste product.Similar phenomenon also occurs in polyimides and the production of Dialok939p resin diamond grinding wheel.For appearance that reduces air pocket in the resin diamond grinding wheel and the quality that improves emery wheel, people have carried out a large amount of fruitful research work, as addition by adjustment curing agent methenamine, hot pressing temperature, time and technology, back solidification temperature, parameters such as time and technology can overcome the appearance of air pocket in the emery wheel substantially.But people also find in producing and studying, and the adjustment of above-mentioned technological parameter is difficult to eliminate fully the appearance of air pocket in the emery wheel sometimes.And in the season of humidity, the easier bubble that occurs of resin wheel causes emery wheel to scrap.Sometimes emery wheel is not found bubble before dispatching from the factory, and bubbling in use appears in emery wheel as a result.According to these phenomenons that occurs aborning, we think that research work in the past, people ignored the physical absorption water in the powder filler and the generation of chemical bonding water bubble in producing and using on the one hand.Ignored resin diamond grinding wheel on the other hand in use, the instantaneous temperature of wheel face reaches the high temperature about 600 ℃, is enough to cause that the phase structure of powder filler changes, and causes the emery wheel quality to descend.By powder filler is carried out the high-temperature calcination activation heat treatment, we think, physical absorption water in the powder filler and chemical bonding water can be deviate from, powder filler can obtain a metastable phase structure, the powder filler granule surface produces fresh surface, this descends the probability that occurs bubble in the emery wheel greatly, is improved in the body intensity and the service life of emery wheel simultaneously.
Summary of the invention
According to present domestic and international research present situation with consider the controllability of resin diamond grinding wheel quality, the objective of the invention is to propose a kind ofly simply to be suitable for and effectively to reduce the probability that bubble occurs in the resin diamond grinding wheel and improve the method for its service life or wearability.
The objective of the invention is to realize by following technical scheme, the method that reduces the resin diamond grinding wheel bubble is as follows: at first powder filler is carried out the high-temperature calcination activation heat treatment, so that slough physical absorption water, chemical bonding water and other volatile materials in the powder filler, allow powder filler obtain metastable phase structure, cool to room temperature then, again according to the powder hot-pressing forming method in press temperature be 190 ℃ hot-forming, carry out the production of resin diamond grinding wheel.
Described high-temperature calcination activation heat treatment temperature is 300～850 ℃, and the time is 1～6 hour, and atmosphere is air, and pressure is normal pressure.Better heat treatment temperature is 400～700 ℃, and the time is 3～5 hours
Described powder filler is the resin diamond grinding wheel customary filler, comprises chromium oxide, zinc oxide, iron oxide, manganese oxide, cerium oxide, carborundum or titanium oxide fine powder.
The used resin-oatmeal of described resin diamond grinding wheel comprises: phenol-formaldehyde resin powder, polyimide resin powder or Dialok939p resin-oatmeal.
Can identify that its process conditions are as follows by grinding test in the wearability of resin diamond grinding wheel or service life:
1 technological requirement:
(1) emery wheel type and spec: 12A
2/ 45 ° of 75 * 25 * 32 * 3 * 3 RVD120/140
#B75
(2) evaluation lathe: MQ6025A universal cutter grinder
(3) evaluation cutter head: YT15 A420
(4) feeding: 0.01mm/ is each
(5) feed: (i.e. four one-strokes)/every feeding once to come and go two-pass
(6) the grinding time: 50 minutes
2 operational procedures:
(1) from the finished product emery wheel, extract the emery wheel of two above-mentioned models, specification out, get the cutter head of the above-mentioned trade mark, specification simultaneously, scrub clean with acetone, absolute ethyl alcohol.Put into 120 ℃ of baking oven bakings 1 hour then, taking-up is put into drier and is cooled to room temperature (about 1 hour of time).
(2) with emery wheel and cutter head respectively at carrying out weighing on the assay balance, be accurate to the 4th of decimal point.
(3) grinding machine carries out oilyly, and dallies 5 minutes.
(4) emery wheel is loaded on the grinding machine, cutter head is loaded on the flat nose pliers.
(5) regulate emery wheel and contact with cutter head is vertical, and about making emery wheel a little less than cutter head 3mm.
(6) start lathe, rotation feed wheel, when emery wheel contact cutter head, the opening entry time, then by the one man operation feed, the one man operation feed, strictness is pressed round trip, feed 0.01mm, grinding 50 minutes.Stop, cut off the power supply.
(7) take off emery wheel and cutter head, scrub clean with acetone and absolute ethyl alcohol.Put into 120 ℃ of baking oven bakings 2 hours, taking-up is put into drier and is cooled to room temperature (about 1 hour of time).
(8) with emery wheel and cutter head respectively at carrying out weighing on the assay balance, be accurate to the 4th of decimal point.
The data of 3 grinding tests are handled
(1) emery wheel wear resistance ratio Ms[G (emery wheel)/Q (workpiece)]
Ms＝(G
1-G
2)/(Q
1-Q
2)
In the formula: G
1And G
2Be respectively the weight (g) of wheel grinding front and back
Q
1And Q
2Be respectively the weight (g) of workpiece grinding front and back
(2) grinding efficiency E (g/min)
E＝(Q
1-Q
2)/T
In the formula: T is grinding time (min).
Emery wheel wear resistance ratio Ms that is obtained by top two formulas and grinding efficiency E are in order to judge and the relatively service life and the grinding efficiency of resin diamond grinding wheel.Found that: after powder filler carries out high-temperature calcination heat treatment, no matter resin is phenolic resins, polyimide resin still is the Dialok939p resin, in the resin diamond grinding wheel of producing, the probability that produces bubble approaches zero, and the wearability of its emery wheel has improved about 5%.Physical absorption water, chemical bonding water and other volatile materials that reason mainly gives the credit in the powder filler are deviate from advance, and powder filler has obtained metastable phase structure, and the formation of filler particles surface unsalted surface etc.This has reduced the resin diamond grinding wheel root that bubble forms in manufacturing and use, has improved the body adhesion strength of resin diamond grinding wheel simultaneously, makes resin diamond grinding wheel in use mass change can not take place.
The specific embodiment
Embodiment 1
Powder filler chromium oxide and zinc oxide are carried out high-temperature calcination heat treatment, at first chromium oxide and zinc oxide were calcined 2 hours at 550 ℃, cool to room temperature then with the furnace, promptly obtain the powder filler of surface activation process.Powder filler with the powder filler of high-temperature calcination processing and not high-temperature calcination processing is that raw material is produced the phenolic resins skive, ambient humidity was about 80% when emery wheel was produced, for comparing research, except that powder filler difference, the prescription and the production technology of two kinds of emery wheels are identical, its grinding wheel formula following (counting by weight percentage not diamantiferous weight): phenol-formaldehyde resin powder: graphite 34.8%: copper powder 5.5%: chromium oxide 17.9%: zinc oxide 27.8%: 14.0%.Press temperature is 190 ℃, and the temperature and time of regelate is respectively 170 ℃ and 15 hours.Each produces 20 emery wheels, and the powder filler of handling with high-temperature calcination is the phenolic resins skive that raw material is produced, and the emery wheel that finds no bubble occurs; On the contrary, the powder filler with not high-temperature calcination processing is that raw material production phenolic resins skive finds have two emery wheels bubble to occur; Its grinding test result shows: the powder filler of handling with high-temperature calcination is the phenolic resins skive that raw material is produced, its average emery wheel wear resistance ratio Ms is 0.0026924, and be the phenolic resins skive that raw material is produced with the powder filler that high-temperature calcination is not handled, its average wear resistance ratio Ms is 0.0028631, after the powder filler surface modification, approximately can prolong about 6% the service life of emery wheel.Grinding efficiency E does not find tangible difference.
Embodiment 2
Selecting resin for use is the polyimide resin powder, and except that used resin-oatmeal difference, other is all identical with embodiment 1 as technology and condition, grinding wheel formula and production technology etc. that powder filler chromium oxide and zinc oxide carry out the high-temperature calcination activation heat treatment.In 20 emery wheels of each production, the powder filler of handling with high-temperature calcination is the Polyimide Resin Bonded Diamond Grinding Wheel that raw material is produced, and the emery wheel that finds no bubble occurs; On the contrary, the powder filler with not high-temperature calcination processing is that raw material production Polyimide Resin Bonded Diamond Grinding Wheel finds have 3 emery wheels bubble to occur; Its grinding test result shows: the powder filler of handling with high-temperature calcination is the Polyimide Resin Bonded Diamond Grinding Wheel that raw material is produced, its average emery wheel wear resistance ratio Ms is 0.0023329, and be the Polyimide Resin Bonded Diamond Grinding Wheel that raw material is produced with the powder filler that high-temperature calcination is not handled, its average wear resistance ratio Ms is 0.0024335, after the powder filler surface modification, approximately can prolong about 4% the service life of emery wheel.Grinding efficiency E does not find tangible difference.
Embodiment 3
Powder filler chromium oxide and zinc oxide are carried out high-temperature calcination heat treatment, at first chromium oxide and zinc oxide were calcined 4 hours at 300 ℃, cool to room temperature then with the furnace, promptly obtain the powder filler of surface activation process.Except that high-temperature calcination heat treatment temperature and asynchronism(-nization), other is all identical with embodiment 1 as technology and condition, grinding wheel formula and production technology etc. that powder filler chromium oxide and zinc oxide carry out the high-temperature calcination activation heat treatment.Produce in 20 emery wheels, the powder filler of handling with high-temperature calcination is the phenolic resins skive that raw material is produced at each, and the emery wheel that finds no bubble occurs; On the contrary, the powder filler of handling with high-temperature calcination not is that the phenolic resins skive of raw material production finds have 2 emery wheels bubble to occur; Its grinding test result shows: the powder filler of handling with high-temperature calcination is the phenolic resins skive that raw material is produced, its average emery wheel wear resistance ratio Ms is 0.0023772, and be the phenolic resins skive that raw material is produced with the powder filler that high-temperature calcination is not handled, its average wear resistance ratio Ms is 0.0024561, after the powder filler surface modification, approximately can prolong about 3% the service life of emery wheel.Grinding efficiency E does not find tangible difference.
Claims (3)
1, a kind ofly reduces the resin diamond grinding wheel bubble and improve the method in its service life, it is characterized in that at first will making the powder filler that resin diamond grinding wheel uses and carry out the high-temperature calcination activation heat treatment, cool to room temperature then, again according to the powder hot-pressing forming method in press temperature be 190 ℃ hot-forming, carry out the production of resin diamond grinding wheel, its powder filler comprises: chromium oxide, zinc oxide, iron oxide, manganese oxide, cerium oxide, carborundum or titanium oxide fine powder, resin-oatmeal comprise phenol-formaldehyde resin powder, polyimide resin powder or Dialok939p resin-oatmeal.
2, the method for claim 1 is characterized in that described high-temperature calcination activation heat treatment temperature is 300～850 ℃, and the time is 1～6 hour, and atmosphere is air, and pressure is normal pressure.
3, the method for claim 1 is characterized in that described heat treatment temperature is 400～700 ℃, and the time is 3～5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02138868 CN1211189C (en) | 2002-08-02 | 2002-08-02 | Method for reducing resin diamond grinding wheel bubble and raising its service life |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02138868 CN1211189C (en) | 2002-08-02 | 2002-08-02 | Method for reducing resin diamond grinding wheel bubble and raising its service life |
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|---|---|
| CN1394719A CN1394719A (en) | 2003-02-05 |
| CN1211189C true CN1211189C (en) | 2005-07-20 |
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| CN 02138868 Expired - Fee Related CN1211189C (en) | 2002-08-02 | 2002-08-02 | Method for reducing resin diamond grinding wheel bubble and raising its service life |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101412207B (en) * | 2008-09-26 | 2010-07-21 | 南京三超金刚石工具有限公司 | Diamond grinding wheel and method for manufacturing tool bit thereof |
| CN101570056B (en) * | 2009-06-02 | 2012-07-04 | 深圳市常兴金刚石磨具有限公司 | Method for producing aromatic resin grinding tool |
| CN103522217B (en) * | 2013-10-16 | 2015-12-02 | 柘城县华鑫超硬磨料磨具有限公司 | Gem and jade processing mill and production technology thereof |
| CN104325416B (en) * | 2014-09-29 | 2016-08-31 | 福建易达纳米材料科技有限公司 | A kind of formula for making nylon abrading block and use the method that this formula makes nylon abrading block |
| CN105252437A (en) * | 2015-10-09 | 2016-01-20 | 芜湖市鸿坤汽车零部件有限公司 | Cerium and titanium precursor composite resin grinding wheel and preparation method thereof |
| CN106346376B (en) * | 2016-08-29 | 2018-07-20 | 南安市铂克装饰工程有限公司 | A kind of resinoid bond concrete grinding and polishing piece and preparation method thereof |
| CN109483415A (en) * | 2018-12-12 | 2019-03-19 | 株洲市超宇实业有限责任公司 | Centreless grinding buffing wheel and its preparation process |
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2002
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