CN105522237B - A kind of metal base grinding wheel online electric spark dressing method during reaction-sintering SIC ceramic grinding - Google Patents
A kind of metal base grinding wheel online electric spark dressing method during reaction-sintering SIC ceramic grinding Download PDFInfo
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- CN105522237B CN105522237B CN201610081907.4A CN201610081907A CN105522237B CN 105522237 B CN105522237 B CN 105522237B CN 201610081907 A CN201610081907 A CN 201610081907A CN 105522237 B CN105522237 B CN 105522237B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
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- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
A kind of metal base grinding wheel online electric spark dressing method during reaction-sintering SIC ceramic grinding, the present invention relates to engineering ceramics accurate grinding manufacture field, and in particular to the metal base grinding wheel dressing method in reaction-sintering SIC ceramics minute surface precision form grinding process.Need to transform lathe the invention aims to solve existing online dressing method to need special sharpening device, during installation, and corrosive working solution to machine maintenance with maintaining the problem of unfavorable.Online electric spark dressing method：Two electrodes of spark discharge are used as using metal base grinding wheel and reaction-sintering SIC ceramics, the power supply of spark discharge is used as using the pulse power, the medium solution of spark discharge is used as using emulsified solution, acted on by spark discharge of the pulse current of the pulse power in medium solution, realize the online electric spark dressing of metal base grinding wheel during reaction-sintering SIC ceramic grinding.Present invention is mainly used for the accurate grinding processing of reaction-sintering SIC ceramics.
Description
Technical field
The present invention relates to engineering ceramics accurate grinding manufacture field, and in particular to reaction-sintering SIC ceramics minute surface precision into
Metal base grinding wheel dressing method in shape grinding process.
Background technology
With the development of space optics technology, the application of SiC ceramic on the mirror is more and more extensive, and especially reaction is burnt
SiC ceramic is tied, it has the advantages of other types SiC ceramic is without with analogy on making bigbore speculum, such as can be real
Existing near net shape, it is easy to make the speculum of larger caliber.Because the hardness of reaction-sintering SIC ceramics is high, using metal
Base grinding wheel grinding is the common method for obtaining high surface figure accuracy speculum, but serious in grinding process medium plain emery wheel abrasive wear, and
After abrasive wear, wheel face metallic bond is difficult to be got rid of in grinding process and expose new abrasive particle, is had a strong impact on
The processing efficiency of reaction-sintering SIC ceramic reflecting mirror.Therefore, the dressing of metal base grinding wheel is studied for reaction-sintering SIC ceramics
The processing and manufacturing of speculum is significant.
At present, for the dressing problem of metal base grinding wheel, there is abrasive lapping method, free abrasive injection dressing method, cup
Traditional mechanical dressing technologies such as shape crushing method, diamond pen dressing method, grinding mild steel method, abrasive band soft-elastic dressing method,
And ultrasonic activation dressing method, HTHP dressing method, laser truing and dressing, electrochemistry dressing method, On-line electrolytic dissolution electric spark are repaiied
The new dressing technologies such as whole method (ELID).However, traditional dressing technology, there is dressing efficiency is low, dressing cost is high, dressing
The shortcomings that frequent and severe operational environment etc. is obvious is counted, and finishing in place can only be realized, therefore usually requires to interrupt grinding process
To carry out the dressing of emery wheel, grinding efficiency is reduced, is especially carrying out heavy caliber reaction-sintering SIC ceramic reflecting mirror
During grinding, grinding is interrupted to carry out the dressing of emery wheel and not only considerably increases the process-cycle, and it is anti-to reaction-sintering SIC ceramics
Forming accuracy and the suface processing quality for penetrating mirror are unfavorable.And although new dressing technology can realize the online dressing of emery wheel,
Shorten the process-cycle, but usually require special sharpening device or corrosive working solution be present.Due to by requirement
With the limitation in Installing machine tool space, realize that the special sharpening device of the online dressing purpose of emery wheel is usually required according to specific lathe
Design and development again is carried out, or even because the requirement of installation needs to transform lathe；And corrosive working solution pair
Machine maintenance is unfavorable with maintaining, and does not meet the theory of green manufacturing.
The content of the invention
Need to enter lathe the invention aims to solve existing online dressing method to need special sharpening device, during installation
Row transformation, and corrosive working solution to machine maintenance and maintains the problem of unfavorable, and a kind of reaction-sintering SIC ceramic grinding is provided
The online electric spark dressing method of metal base grinding wheel during cutting.
A kind of metal base grinding wheel online electric spark dressing method during reaction-sintering SIC ceramic grinding, specifically with
What lower step was completed：Using the electric conductivity of metal base grinding wheel and reaction-sintering SIC ceramics, with metal base grinding wheel and reaction-sintered
Two electrodes of the SiC ceramic as spark discharge, the power supply of spark discharge, metal base grinding wheel and pulse electricity are used as using the pulse power
The positive pole connection in source, reaction-sintering SIC ceramics are connected with the negative pole of the pulse power, and Jie of spark discharge is used as using emulsified solution
Matter solution, acted on by spark discharge of the pulse current of the pulse power in medium solution, realize reaction-sintering SIC ceramic grinding
The online electric spark dressing of metal base grinding wheel during cutting.
Compared with prior art, advantage is as follows by the present invention：
First, grinding process need not be interrupted, overcome traditional dressing method dressing efficiency it is low, interrupt grinding caused by process effect
Rate is low and the shortcomings that forming accuracy difference, realizes the online dressing of metal base grinding wheel during reaction-sintering SIC ceramic grinding, improves
Reaction-sintering SIC ceramic grinding processing efficiency；
2nd, special trimming device is not needed, only metal base grinding wheel and reaction-sintering SIC ceramic workpiece, which need to be powered, is
Can, avoid the special sharpening device design carried out in new dressing technology for lathe and develop so that in grinding process
The dressing of metal base grinding wheel becomes simple and easy to do；
3rd, the spark discharge during reaction-sintering SIC ceramic grinding is acted on also to reaction-sintering SIC ceramic workpiece
Material has removal effect, improves the material removing rate of reaction-sintering SIC ceramics in grinding process.
4th, this method can be additionally used in other conductive or weakly conducting difficult-to-machine material accurate grindings processing, can obtain compared with
High processing efficiency and preferable finished surface.
Present invention is mainly used for the accurate grinding processing of reaction-sintering SIC ceramics.
Brief description of the drawings
Fig. 1 is the signal of the online electric spark dressing of metal base grinding wheel during the reaction-sintering SIC ceramic grinding of embodiment 1
Figure；
Fig. 2 is the principle of the online electric spark dressing of metal base grinding wheel during the reaction-sintering SIC ceramic grinding of embodiment 1
Schematic diagram.
Embodiment
Embodiment one：Present embodiment is the metal base grinding wheel during a kind of reaction-sintering SIC ceramic grinding
Online electric spark dressing method, specifically following steps are completed：Utilize the conduction of metal base grinding wheel and reaction-sintering SIC ceramics
Property, using metal base grinding wheel and reaction-sintering SIC ceramics as two electrodes of spark discharge, spark discharge is used as using the pulse power
Power supply, the positive pole of metal base grinding wheel and the pulse power connected, and reaction-sintering SIC ceramics are connected with the negative pole of the pulse power, with
Medium solution of the emulsified solution as spark discharge, pass through spark discharge of the pulse current of the pulse power in medium solution
Effect, realizes the online electric spark dressing of metal base grinding wheel during reaction-sintering SIC ceramic grinding.
The granularity of metal base grinding wheel described in present embodiment can be from micro powder grade to general granularity.In reaction-sintering SIC ceramics
, can be according to reduce discharge process influence to reaction-sintering SIC ceramics accurate grinding machined surface quality simultaneously in grinding process
According to the pulse power both positive and negative polarity connection of discharge parameter reasonable selection metal base grinding wheel and reaction-sintering SIC ceramics.
Embodiment two：The difference of present embodiment and embodiment one is：Described reaction-sintering SIC
Ceramics are connected by brush by the negative pole of wire and the pulse power, and the brush is not by the motion shape of reaction-sintering SIC ceramics
The influence of formula.Other are identical with embodiment one.
The specific installation method of present embodiment is as follows：
Metal base grinding wheel is fixed on machine tool chief axis, metal base grinding wheel by carbon brush by wire or directly and the pulse power
Positive pole connection, described carbon brush be arranged on metal base grinding wheel center position, ensure carbon brush do not transported by metal base grinding wheel
The influence of dynamic form；Reaction-sintering SIC ceramics clamping is on platen, and reaction-sintering SIC ceramics and platen
Insulation, then a brush support device is installed on platen, reaction-sintering SIC ceramics are by brush by wire or direct
It is connected with the negative pole of the pulse power, and the brush is not influenceed by the forms of motion of reaction-sintering SIC ceramics, by reaction-sintered
SiC ceramic, brush, metal base grinding wheel, wire, carbon brush and the pulse power form discharge loop；When carbon brush and brush not with arteries and veins
When rushing power supply and being directly connected to, described discharge loop includes wire.
Reaction-sintering SIC ceramics are moved in the form of gyration during reaction-sintering SIC ceramic grinding or straight line is past
Multiple forms of motion motion.
Embodiment three：Present embodiment is with one of embodiment one or two difference：Described pulse
Power supply is high frequency pulse positive pole, and pulse voltage, pulse current and the discharge time of high frequency pulse positive pole are according to online
The requirement of electric spark dressing is adjusted.Other are identical with embodiment one or two.
During reaction-sintering SIC ceramic grinding, the pulse current of high frequency pulse positive pole metal base grinding wheel with
Spark discharge effect between reaction-sintering SIC ceramics, not only has ablation effect to the metallic bond material of metal base grinding wheel, from
And the dressing to metal base grinding wheel is realized, still there is removal effect to the surfacing of reaction-sintering SIC ceramics, while discharged
Caused HTHP effect also changes the physicochemical property of workpiece surface material in journey, makes it easier for by metal base grinding wheel table
The ablation of face abrasive particle removes, so as to improve the processing efficiency of reaction-sintering SIC ceramics accurate grinding.
Embodiment four：Present embodiment is with one of embodiment one to three difference：Described emulsification
Solution is insulation emulsion, and insulation emulsion injects metal in a manner of fliud flushing during reaction-sintering SIC ceramic grinding
Discharging gap between base grinding wheel and reaction-sintering SIC ceramics.Other are identical with embodiment one to three.
Present embodiment carrying out practically process is as follows：
During reaction-sintering SIC ceramic grinding, high frequency pulse positive pole, the arteries and veins of high frequency pulse positive pole are opened
Rushing voltage, pulse current and discharge time can be adjusted according to the requirement of online electric spark dressing；To metal base grinding wheel with
Discharging gap between reaction-sintering SIC ceramics injects insulation emulsion in a manner of fliud flushing, forms the liquid of spark discharge
Media environment, recycling the abrasive particle of Metal Substrate wheel face protrusion makes institute's shape between metal base grinding wheel and reaction-sintering SIC ceramics
Into discharging gap discharged, the metallic bond of metal base grinding wheel is removed, make the abrasive particle in metal base grinding wheel it is micro- go out sword,
Reach the purpose of the dressing during Metal Substrate wheel grinding.
The emulsion that insulated in present embodiment is injected in a manner of fliud flushing between metal base grinding wheel and reaction-sintering SIC ceramics
Discharging gap can not only meet requirement of the spark discharge to discharge medium, and can meet grinding process to cooling and
The requirement of chip removal, the discharge channel that can also be effectively compressed during spark discharge, increase the material removing rate of spark discharge,
Improve the dressing efficiency of metal base grinding wheel.
Embodiment five：The difference of present embodiment and embodiment four is：Described metal base grinding wheel
Metallic bond surface and reaction-sintering SIC ceramics of the discharging gap for metal base grinding wheel between reaction-sintering SIC ceramics
Gap between work surface.Other are identical with embodiment four.
The metallic bond surface of metal base grinding wheel described in present embodiment and reaction-sintering SIC ceramics work surface
Between gap depend on Metal Substrate wheel face abrasive particle protrusion height and cutting depth.
Embodiment six：The difference of present embodiment and embodiment four is：Described metal base grinding wheel
Discharging gap between reaction-sintering SIC ceramics is between 5 μm~50 μm.Other are identical with embodiment four.
Embodiment seven：Present embodiment is with one of embodiment one to six difference：Described reaction
The online electric spark dressing relevant parameter of metal base grinding wheel during sintered sic ceramic grinding is as follows：Pulse voltage be 60~
120V, pulse current are adjusted in the range of 0~50A, and pulsed discharge width is the μ s of 1 μ s~99, and discharge interval is 0 μ s~99
μs.Other are identical with embodiment one to six.
During metal base grinding wheel dressing is carried out using present embodiment, if the sand of selection suitable construction parameter
Wheel, discharge parameter and machined parameters, it not only can guarantee that the metal base grinding wheel during reaction-sintering SIC ceramics accurate grinding begins
There is good sharp degree eventually, moreover it is possible to improve the removal efficiency of reaction-sintering SIC ceramics.
Present invention is not limited only to the content of the respective embodiments described above, the group of one of them or several embodiments
Contract sample can also realize the purpose of invention.
Using following verification experimental verifications effect of the present invention
Embodiment 1：With reference to Fig. 1 and Fig. 2, the metal base grinding wheel during a kind of reaction-sintering SIC ceramic grinding is electric online
What spark dressing method, specifically following steps were completed：
Using the electric conductivity of metal base grinding wheel and reaction-sintering SIC ceramics, with metal base grinding wheel and reaction-sintering SIC ceramics
As two electrodes of spark discharge, using the pulse power as the power supply of spark discharge, metal base grinding wheel and the pulse power are just
Pole is connected, and reaction-sintering SIC ceramics are connected with the negative pole of the pulse power, and the medium using emulsified solution as spark discharge is molten
Liquid, acted on by spark discharge of the pulse current of the pulse power in medium solution, realize reaction-sintering SIC ceramic grinding mistake
The online electric spark dressing of metal base grinding wheel in journey；Pulse power relevant parameter is as follows：Pulse voltage is 90V, and pulse current selects
With triple channel electric current, pulse current excursion is 0.8A~1.2A, pulse frequency 10KHz, and pulsed discharge width is 50 μ s, arteries and veins
Impulse electricity is at intervals of 50 μ s.It is as follows to be ground relevant parameter：Metal Substrate grinding wheel speed is 2880r/min, feed speed 100mm/s,
2 μm of feeding depth, emery wheel axial movement interval 3mm.
The skive that metal base grinding wheel described in the present embodiment is a diameter of 200mm, thickness is 12mm, its grain size number are
120#, concentration 100%, metallic bond is cast iron.
The specific installation method of the present embodiment is as follows：
Using FS420LC precision horizontal axis surface grinding machines, metal base grinding wheel is fixed on machine tool chief axis, metal base grinding wheel leads to
Cross graphite carbon brush to be connected by wire or directly with the positive pole of the pulse power, described graphite carbon brush is arranged in metal base grinding wheel
Heart opening position, reduce the loss of graphite carbon brush；Reaction-sintering SIC ceramics clamping is on platen, and reaction-sintering SIC is made pottery
Porcelain is insulated with platen, then a brush support device is installed on platen, and reaction-sintering SIC ceramics pass through copper
Piece brush is connected by wire or directly with the negative pole of the pulse power, and the copper leaf brush is not transported by reaction-sintering SIC ceramics
The influence of dynamic form, the forms of motion of the reaction-sintering SIC ceramics is straight reciprocating motion；By reaction-sintering SIC ceramics, copper
Piece brush, metal base grinding wheel, graphite carbon brush, wire and the pulse power form discharge loop.
Emulsified solution described in the present embodiment is insulation emulsion, and is insulated during reaction-sintering SIC ceramic grinding
The discharging gap that emulsion is injected in a manner of fliud flushing between metal base grinding wheel and reaction-sintering SIC ceramics；Described Metal Substrate
Metallic bond surface and reaction-sintering SIC of the discharging gap for metal base grinding wheel between emery wheel and reaction-sintering SIC ceramics
Gap between ceramic work surface；Discharging gap between described metal base grinding wheel and reaction-sintering SIC ceramics is in 10 μ
Between m~30 μm.
Fig. 1 is the signal of the online electric spark dressing of metal base grinding wheel during the reaction-sintering SIC ceramic grinding of embodiment 1
Figure；1 is machine tool chief axis in figure, and 2 be metal base grinding wheel, and 3 be carbon brush support frame, and 4 be graphite carbon brush, and 5 be high frequency pulse dc electricity
Source, 6 be platen, and 7 be insulation board, and 8 be reaction-sintering SIC ceramics, and 9 be brush support frame, and 10 be copper leaf brush, in figure
Arrow on metal base grinding wheel 2 represents the rotation direction of metal base grinding wheel 2；Fig. 2 is the reaction-sintering SIC ceramic grinding of embodiment 1
During the online electric spark dressing of metal base grinding wheel principle schematic, 2 be metal base grinding wheel in figure, and 4 be graphite carbon brush, 5
It is reaction-sintering SIC ceramics for high frequency pulse positive pole, 8,10 be copper leaf brush, and 11 be abrasive particle, and 12 be discharge channel, and 13 are
Emulsified solution nozzle, the arrow in figure on metal base grinding wheel 2 represent the rotation direction of metal base grinding wheel 2, reaction-sintering SIC in figure
Arrow on ceramics 8 represents the direction of motion of reaction-sintering SIC ceramics 8；By Fig. 1 and Fig. 2, metal base grinding wheel 2 is fixed
On machine tool chief axis 1, carbon brush support frame 3 is fixed in main shaft shell, graphite carbon brush 4 be arranged on support frame 3 on and with emery wheel 2
The metallic matrix contact of the heart, is thus accessing high frequency pulse positive pole 5 just through graphite carbon brush 4 with wire by metal base grinding wheel
Pole；Reaction-sintering SIC 8 clampings of ceramics make reaction-sintering SIC ceramics 8 and lathe worker on platen 6, and by insulation board 7
Make to insulate between platform 6；Brush support frame 9 is fixed on platen 6, and its copper leaf brush 10 supported is made pottery with reaction-sintering SIC
Porcelain 8 keeps good contact, then reaction-sintering SIC ceramics 8 are connected with the negative pole of high frequency pulse positive pole 5 via wire,
So as to form the discharge loop of metal base grinding wheel dressing in grinding process；When carrying out reaction-sintering SIC ceramic grinding, open high
The frequency pulse power 5, make to load upper discharge voltage (i.e. pulse voltage) between metal base grinding wheel 2 and reaction-sintering SIC ceramics 8.In gold
When sintered sic ceramics 8 are answered in the protrusion cutting of abrasive particle 11 of category base grinding wheel 2 surface, metallic bond surface and the reaction of metal base grinding wheel 2
Sintered sic ceramics treat between 8 finished surfaces there is gap, so as to form the discharging gap needed for electric discharge.Carried in nozzle 13
In the insulation emulsion environment of confession, metal base grinding wheel 2 and reaction-sintering SIC ceramics treat that the pulse voltage between 8 makes insulation emulsion
It is breakdown, discharge channel 12 is formed, produces spark discharge.Instantaneous height of the metallic bond of metal base grinding wheel 2 in spark discharge
Temperature effect is lower to be produced melting, vaporization and evaporation etc. and removes so that the abrasive particle in metal base grinding wheel 2 it is micro- go out sword, reach grinding
During the dressing of metal base grinding wheel 2 purpose so that the metal base grinding wheel 2 during reaction-sintering SIC ceramic grinding is protected all the time
Preferable sharp degree is held, so as to improve the processing efficiency of reaction-sintering SIC ceramics accurate grinding.
The present embodiment ensures that metal base grinding wheel remains sharp in grinding process, has reached metal in grinding process very well
The purpose of the online dressing of base grinding wheel；The processing efficiency of reaction-sintering SIC ceramics can be also improved simultaneously, compared with prior art, this
The processing efficiency of embodiment reaction-sintering SIC ceramics is improved close to 10%.
Claims (4)
1. a kind of online electric spark dressing method of metal base grinding wheel during reaction-sintering SIC ceramic grinding, it is characterised in that
It is that following steps are completed：Using the electric conductivity of metal base grinding wheel and reaction-sintering SIC ceramics, with metal base grinding wheel and reaction
Two electrodes of the sintered sic ceramics as spark discharge, the power supply of spark discharge, metal base grinding wheel and arteries and veins are used as using the pulse power
The positive pole connection of power supply is rushed, reaction-sintering SIC ceramics are connected with the negative pole of the pulse power, and spark discharge is used as using emulsified solution
Medium solution, acted on by spark discharge of the pulse current of the pulse power in medium solution, realize that reaction-sintering SIC is made pottery
Porcelain mill cut during the online electric spark dressing of metal base grinding wheel；
Described emulsified solution is insulation emulsion, and insulate emulsion during reaction-sintering SIC ceramic grinding with fliud flushing
Mode inject in the discharging gap between metal base grinding wheel and reaction-sintering SIC ceramics；
Discharging gap between described metal base grinding wheel and reaction-sintering SIC ceramics is the metallic bond table of metal base grinding wheel
Gap between face and reaction-sintering SIC ceramics work surface；
Discharging gap between described metal base grinding wheel and reaction-sintering SIC ceramics is between 5 μm~50 μm.
2. the online electric spark of metal base grinding wheel during a kind of reaction-sintering SIC ceramic grinding according to claim 1
Dressing method, it is characterised in that described reaction-sintering SIC ceramics are connected by brush by the negative pole of wire and the pulse power.
3. the online electric spark of metal base grinding wheel during a kind of reaction-sintering SIC ceramic grinding according to claim 1
Dressing method, it is characterised in that the described pulse power is high frequency pulse positive pole, and the pulse of high frequency pulse positive pole is electric
Pressure, pulse current and discharge time are adjusted according to the requirement of online electric spark dressing.
4. the online electric spark of metal base grinding wheel during a kind of reaction-sintering SIC ceramic grinding according to claim 1
Dressing method, it is characterised in that the online electric spark dressing of metal base grinding wheel during described reaction-sintering SIC ceramic grinding
Relevant parameter is as follows：Pulse voltage is 60~120V, and pulse current is adjusted in the range of 0~50A, and pulsed discharge width is 1 μ s
~99 μ s, discharge interval are the μ s of 0 μ s~99.
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| CN112548686A (en) * | 2020-12-01 | 2021-03-26 | 常州晶业液态金属有限公司 | Material removing processing method of amorphous alloy product |
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| CN1562566A (en) * | 2004-04-06 | 2005-01-12 | 北京工业大学 | Online electrolytic grinding and trimming method by using grinding wheel in metal binding agent type, and equipment |
| CN1785566A (en) * | 2005-12-21 | 2006-06-14 | 湖南大学 | Electric spark-mechanical compound shaping method of metal bindnig agent extra hard abradant sand wheel |
| CN101716748A (en) * | 2010-01-20 | 2010-06-02 | 湖南大学 | On-line electrolytic dressing high-speed deep grinding method of hard and crisp difficultly processed material |
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