CN105522237A - Online electrospark sharpening method of metal base grinding wheel in reactive sintering SiC ceramic grinding process - Google Patents
Online electrospark sharpening method of metal base grinding wheel in reactive sintering SiC ceramic grinding process Download PDFInfo
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- CN105522237A CN105522237A CN201610081907.4A CN201610081907A CN105522237A CN 105522237 A CN105522237 A CN 105522237A CN 201610081907 A CN201610081907 A CN 201610081907A CN 105522237 A CN105522237 A CN 105522237A
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- emery wheel
- sintering sic
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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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- Mechanical Engineering (AREA)
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- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses an online electrospark sharpening method of a metal base grinding wheel in a reactive sintering SiC ceramic grinding process, relates to the field of precise grinding of engineering ceramic, in particular to a metal base grinding wheel sharpening method in a reactive sintering SiC ceramic mirror surface precise forming grinding process, and aims to solve the problems of need of a special sharpening device in a traditional online sharpening method, need of transforming a machine tool during installing and generation of bad influence on maintenance of the machine tool by corrosive working fluid. The online electrospark sharpening method comprises the following steps: the metal base grinding wheel and reactive sintering SiC ceramic serve as two electrodes of spark discharge; a pulse power supply serves as a power supply of spark discharge; emulsified solution serves as medium solution of electrospark discharge; and online electrospark sharpening of the metal base grinding wheel in the reactive sintering SiC ceramic grinding process is realized through a spark discharge effect of pulse current of the pulse power supply in the medium solution. The online electrospark sharpening method is mainly applied to precise grinding of the reactive sintering SiC ceramic.
Description
Technical field
The present invention relates to engineering ceramics accurate grinding manufacture field, be specifically related to the Metal Substrate emery wheel dressing method in reaction-sintering SIC pottery minute surface precision form grinding process.
Background technology
Along with the development of space optics technology, SiC ceramic application is on the mirror more and more extensive, especially reaction-sintering SIC pottery, it has other types SiC ceramic without the advantage with analogy on the bigbore speculum of making, as near net shape can be realized, be easy to the speculum making larger caliber.Because the hardness of reaction-sintering SIC pottery is high, Metal Substrate wheel grinding is adopted to be the common method obtaining high surface figure accuracy speculum, but it is serious at grinding process medium plain emery wheel abrasive wear, and after abrasive wear, wheel face metallic bond is difficult to get rid of in grinding process and exposes new abrasive particle, has had a strong impact on the working (machining) efficiency of reaction-sintering SIC ceramic reflecting mirror.Therefore, the dressing studying Metal Substrate emery wheel is significant for the processing and manufacturing of reaction-sintering SIC ceramic reflecting mirror.
At present, for the dressing problem of Metal Substrate emery wheel, there is the mechanical dressing technology that abrasive lapping method, free abrasive injection dressing method, cup emery wheel dressing method, diamond pen dressing method, grinding mild steel method, abrasive band soft-elastic dressing method etc. are traditional, and ultrasonic wave vibrates the novel dressing technology such as dressing method, HTHP dressing method, laser truing and dressing, electrochemistry dressing method, On-line electrolytic dissolution electric spark shaving method (ELID).But, it is low that tradition dressing technology also exists dressing efficiency, dressing cost is high, the obvious shortcomings such as the frequent and severe operational environment of dressing number of times, and finishing in place can only be realized, therefore usually need to interrupt grinding process to carry out the dressing of emery wheel, reduce grinding efficiency, especially when carrying out the grinding of heavy caliber reaction-sintering SIC ceramic reflecting mirror, interrupt the dressing that grinding carries out emery wheel and not only considerably increase the process-cycle, and to the forming accuracy of reaction-sintering SIC ceramic reflecting mirror and suface processing quality unfavorable.And although novel dressing technology can realize the online dressing of emery wheel, shorten the process-cycle, usually need special sharpening device or there is corrosive working solution.Owing to being subject to the restriction in instructions for use and Installing machine tool space, the special sharpening device realizing emery wheel online dressing object needs to carry out design again and development according to specific lathe usually, and the requirement even owing to installing needs to transform lathe; And corrosive working solution is unfavorable with maintenance to machine maintenance, and do not meet the theory of green manufacturing.
Summary of the invention
The present invention seeks to solve existing online dressing method and need special sharpening device, need during installation to transform lathe, and corrosive working solution is to machine maintenance and the disadvantageous problem of maintenance, and provide the method for the Metal Substrate emery wheel online electric spark dressing in a kind of reaction-sintering SIC ceramic grinding process.
A kind of Metal Substrate emery wheel online electric spark dressing method in reaction-sintering SIC ceramic grinding process, specifically following steps complete: the electric conductivity utilizing Metal Substrate emery wheel and reaction-sintering SIC pottery, using Metal Substrate emery wheel and reaction-sintering SIC pottery as two electrodes of spark discharge, using the pulse power as the power supply of spark discharge, Metal Substrate emery wheel is connected with the positive pole of the pulse power, reaction-sintering SIC pottery is connected with the negative pole of the pulse power, using emulsified solution as the medium solution of spark discharge, by the spark discharge effect of pulse current in medium solution of the pulse power, the online electric spark dressing of Metal Substrate emery wheel in realization response sintered sic ceramic grinding process.
Compared with prior art, advantage is as follows in the present invention:
One, without the need to interrupting grinding process, overcome the shortcoming that working (machining) efficiency is low and forming accuracy is poor that traditional dressing method dressing efficiency is low, interruption grinding causes, the online dressing of Metal Substrate emery wheel in realization response sintered sic ceramic grinding process, improves reaction-sintering SIC ceramic grinding working (machining) efficiency;
Two, special trimming device is not needed, only need be energized to Metal Substrate emery wheel and reaction-sintering SIC ceramic workpiece, avoid the special sharpening device carried out for lathe in novel dressing technology to design and development, make the dressing of the Metal Substrate emery wheel in grinding process become simple and easy to do;
Three, the spark discharge effect in reaction-sintering SIC ceramic grinding process also has removal effect to reaction-sintering SIC ceramic workpiece material, improves the material removing rate of reaction-sintering SIC pottery in grinding process.
Four, the method also can be used for, in the accurate grinding processing of other conduction or weakly conducting difficult-to-machine material, can obtaining higher working (machining) efficiency and good finished surface.
The present invention is mainly used in the accurate grinding processing of reaction-sintering SIC pottery.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the online electric spark dressing of Metal Substrate emery wheel in embodiment 1 reaction-sintering SIC ceramic grinding process;
Fig. 2 is the principle schematic of the online electric spark dressing of Metal Substrate emery wheel in embodiment 1 reaction-sintering SIC ceramic grinding process.
Detailed description of the invention
Detailed description of the invention one: present embodiment is a kind of Metal Substrate emery wheel online electric spark dressing method in reaction-sintering SIC ceramic grinding process, specifically following steps complete: the electric conductivity utilizing Metal Substrate emery wheel and reaction-sintering SIC pottery, using Metal Substrate emery wheel and reaction-sintering SIC pottery as two electrodes of spark discharge, using the pulse power as the power supply of spark discharge, Metal Substrate emery wheel is connected with the positive pole of the pulse power, reaction-sintering SIC pottery is connected with the negative pole of the pulse power, using emulsified solution as the medium solution of spark discharge, by the spark discharge effect of pulse current in medium solution of the pulse power, the online electric spark dressing of Metal Substrate emery wheel in realization response sintered sic ceramic grinding process.
The granularity of Metal Substrate emery wheel described in present embodiment can from micro powder grade to general granularity.In reaction-sintering SIC ceramic grinding process, for reducing discharge process simultaneously on the impact of reaction-sintering SIC pottery accurate grinding machined surface quality, can according to the pulse power both positive and negative polarity connection of discharge parameter choose reasonable Metal Substrate emery wheel and reaction-sintering SIC pottery.
Detailed description of the invention two: present embodiment with the difference of detailed description of the invention one is: described reaction-sintering SIC pottery is connected with the negative pole of the pulse power by wire by brush, and described brush is not by the impact of the forms of motion of reaction-sintering SIC pottery.Other are identical with detailed description of the invention one.
The concrete installation method of present embodiment is as follows:
Be fixed on machine tool chief axis by Metal Substrate emery wheel, Metal Substrate emery wheel is by carbon brush by wire or be directly connected with the positive pole of the pulse power, and described carbon brush is arranged on the center position of Metal Substrate emery wheel, ensures carbon brush by the impact of the forms of motion of Metal Substrate emery wheel; Reaction-sintering SIC pottery clamping is on platen, and reaction-sintering SIC pottery insulate with platen, on platen, a brush support device is installed again, reaction-sintering SIC pottery by brush by wire or be directly connected with the negative pole of the pulse power, and described brush is not by the impact of the forms of motion of reaction-sintering SIC pottery, forms discharge loop by reaction-sintering SIC pottery, brush, Metal Substrate emery wheel, wire, carbon brush and the pulse power; When carbon brush is not all directly connected with the pulse power with brush, described discharge loop comprises wire.
In reaction-sintering SIC ceramic grinding process, reaction-sintering SIC pottery is with the motion of gyration form or the motion of straight reciprocating motion form.
Detailed description of the invention three: one of present embodiment and detailed description of the invention one or two difference is: the described pulse power is high frequency pulse dc power supply, pulse voltage, the pulse current of high frequency pulse dc power supply and regulate according to the requirement of online electric spark dressing discharge time.Other are identical with detailed description of the invention one or two.
In reaction-sintering SIC ceramic grinding process, the spark discharge effect of pulse current between Metal Substrate emery wheel and reaction-sintering SIC pottery of high frequency pulse dc power supply, not only there is ablation effect to the corrupt split agent material of Metal Substrate emery wheel, thus the dressing realized Metal Substrate emery wheel, still there is removal effect to the surfacing of reaction-sintering SIC pottery, the HTHP effect simultaneously produced in discharge process have also been changed the physicochemical property of surface of the work material, it is made to be easier to be removed by the ablation of Metal Substrate wheel face abrasive particle, thus improve the working (machining) efficiency of reaction-sintering SIC pottery accurate grinding.
Detailed description of the invention four: one of present embodiment and detailed description of the invention one to three difference is: described emulsified solution is insulation emulsion, and the emulsion that insulate in reaction-sintering SIC ceramic grinding process injects discharging gap between Metal Substrate emery wheel and reaction-sintering SIC pottery in the mode of rushing liquid.Other are identical with detailed description of the invention one to three.
Present embodiment carrying out practically process is as follows:
In reaction-sintering SIC ceramic grinding process, open high frequency pulse dc power supply, pulse voltage, the pulse current of high frequency pulse dc power supply and all can regulate according to the requirement of online electric spark dressing discharge time; Insulation emulsion is injected in the mode of rushing liquid to the discharging gap between Metal Substrate emery wheel and reaction-sintering SIC pottery, form the liquid medium environment of spark discharge, the abrasive particle that recycling Metal Substrate wheel face protrudes makes the discharging gap formed between Metal Substrate emery wheel and reaction-sintering SIC pottery discharge, the metallic bond of Metal Substrate emery wheel is removed, make the abrasive particle in Metal Substrate emery wheel micro-go out sword, reach the object of the dressing in Metal Substrate wheel grinding process.
The discharging gap that the emulsion that insulate in present embodiment injects between Metal Substrate emery wheel and reaction-sintering SIC pottery in the mode of rushing liquid not only can meet the requirement of spark discharge to discharge medium, and grinding process can be met to cooling and the requirement of chip removal, effectively can also compress the discharge channel in spark discharge process, increase the material removing rate of spark discharge, improve the dressing efficiency of Metal Substrate emery wheel.
Detailed description of the invention five: the difference of present embodiment and detailed description of the invention four is: the discharging gap between described Metal Substrate emery wheel and reaction-sintering SIC pottery is the gap between the metallic bond surface of Metal Substrate emery wheel and the ceramic work surface of reaction-sintering SIC.Other are identical with detailed description of the invention four.
Protrusion height and the cutting depth of Metal Substrate wheel face abrasive particle are depended in gap between the metallic bond surface of the Metal Substrate emery wheel described in present embodiment and the ceramic work surface of reaction-sintering SIC.
Detailed description of the invention six: the difference of present embodiment and detailed description of the invention four is: the discharging gap between described Metal Substrate emery wheel and reaction-sintering SIC pottery is between 5 μm ~ 50 μm.Other are identical with detailed description of the invention four.
Detailed description of the invention seven: one of present embodiment and detailed description of the invention one to six difference is: the Metal Substrate emery wheel online electric spark dressing relevant parameter in described reaction-sintering SIC ceramic grinding process is as follows: pulse voltage is 60 ~ 120V, pulse current regulates within the scope of 0 ~ 50A, pulsed discharge width is 1 μ s ~ 99 μ s, and discharge interval is 0 μ s ~ 99 μ s.Other are identical with detailed description of the invention one to six.
Carry out in the process of Metal Substrate emery wheel dressing in employing present embodiment, if select the emery wheel of suitable construction parameter, discharge parameter and machined parameters, can not only ensure that the Metal Substrate emery wheel in reaction-sintering SIC pottery accurate grinding process has good sharp degree all the time, the removal efficiency of reaction-sintering SIC pottery can also be improved.
Content of the present invention is not limited only to the content of the respective embodiments described above, and the combination of one of them or several detailed description of the invention equally also can realize the object of inventing.
Adopt following verification experimental verification effect of the present invention
Embodiment 1: composition graphs 1 and Fig. 2, a kind of Metal Substrate emery wheel online electric spark dressing method in reaction-sintering SIC ceramic grinding process, specifically following steps complete:
Utilize the electric conductivity of Metal Substrate emery wheel and reaction-sintering SIC pottery, using Metal Substrate emery wheel and reaction-sintering SIC pottery as two electrodes of spark discharge, using the pulse power as the power supply of spark discharge, Metal Substrate emery wheel is connected with the positive pole of the pulse power, reaction-sintering SIC pottery is connected with the negative pole of the pulse power, using emulsified solution as the medium solution of spark discharge, by the spark discharge effect of pulse current in medium solution of the pulse power, the online electric spark dressing of Metal Substrate emery wheel in realization response sintered sic ceramic grinding process; Pulse power relevant parameter is as follows: pulse voltage is 90V, and pulse current selects triple channel electric current, and pulse current excursion is 0.8A ~ 1.2A, pulse frequency 10KHz, and pulsed discharge width is 50 μ s, and discharge interval is 50 μ s.Grinding relevant parameter is as follows: Metal Substrate grinding wheel speed is 2880r/min, feed speed 100mm/s, and feeding depth 2 μm, emery wheel moves axially interval 3mm.
Metal Substrate emery wheel described in the present embodiment is diameter is 200mm, thickness is the skive of 12mm, and its grain size number is 120
#, concentration is 100%, and metallic bond is cast iron.
The concrete installation method of the present embodiment is as follows:
Adopt the accurate horizontal axis surface grinding machine of FS420LC, Metal Substrate emery wheel is fixed on machine tool chief axis, Metal Substrate emery wheel is by graphite carbon brush by wire or be directly connected with the positive pole of the pulse power, and described graphite carbon brush is arranged on the center position of Metal Substrate emery wheel, reduces the loss of graphite carbon brush; Reaction-sintering SIC pottery clamping is on platen, and reaction-sintering SIC pottery insulate with platen, on platen, a brush support device is installed again, reaction-sintering SIC pottery by copper leaf brush by wire or be directly connected with the negative pole of the pulse power, and described copper leaf brush is not by the impact of the forms of motion of reaction-sintering SIC pottery, the forms of motion of described reaction-sintering SIC pottery is straight reciprocating motion; Discharge loop is formed by reaction-sintering SIC pottery, copper leaf brush, Metal Substrate emery wheel, graphite carbon brush, wire and the pulse power.
Emulsified solution described in the present embodiment is insulation emulsion, and the emulsion that insulate in reaction-sintering SIC ceramic grinding process injects discharging gap between Metal Substrate emery wheel and reaction-sintering SIC pottery in the mode of rushing liquid; Discharging gap between described Metal Substrate emery wheel and reaction-sintering SIC pottery is the gap between the metallic bond surface of Metal Substrate emery wheel and the ceramic work surface of reaction-sintering SIC; Discharging gap between described Metal Substrate emery wheel and reaction-sintering SIC pottery is between 10 μm ~ 30 μm.
Fig. 1 is the schematic diagram of the online electric spark dressing of Metal Substrate emery wheel in embodiment 1 reaction-sintering SIC ceramic grinding process; In figure, 1 is machine tool chief axis, 2 is Metal Substrate emery wheel, 3 is carbon brush bracing frame, and 4 is graphite carbon brush, and 5 is high frequency pulse dc power supply, 6 is platen, 7 is insulation board, and 8 is reaction-sintering SIC pottery, and 9 is brush support frame, 10 is copper leaf brush, and the arrow in figure on Metal Substrate emery wheel 2 represents the rotation direction of Metal Substrate emery wheel 2; Fig. 2 is the principle schematic of the online electric spark dressing of Metal Substrate emery wheel in embodiment 1 reaction-sintering SIC ceramic grinding process, in figure, 2 is Metal Substrate emery wheel, 4 is graphite carbon brush, 5 is high frequency pulse dc power supply, 8 is reaction-sintering SIC pottery, 10 is copper leaf brush, 11 is abrasive particle, 12 is discharge channel, 13 is emulsified solution nozzle, arrow in figure on Metal Substrate emery wheel 2 represents the rotation direction of Metal Substrate emery wheel 2, and the arrow in figure on reaction-sintering SIC pottery 8 represents the direction of motion of reaction-sintering SIC pottery 8; Known by Fig. 1 and Fig. 2, Metal Substrate emery wheel 2 is fixed on machine tool chief axis 1, carbon brush bracing frame 3 is fixed in main shaft shell, graphite carbon brush 4 to be arranged on bracing frame 3 and to contact with the metallic matrix at emery wheel 2 center, thus with wire through the positive pole of graphite carbon brush 4 by Metal Substrate emery wheel access high frequency pulse dc power supply 5; Reaction-sintering SIC pottery 8 clampings on platen 6, and are made to insulate between reaction-sintering SIC pottery 8 and platen 6 by insulation board 7; Brush support frame 9 is fixed on platen 6, the copper leaf brush 10 that it supports keeps good contact with reaction-sintering SIC pottery 8, via wire, the negative pole of reaction-sintering SIC pottery 8 with high frequency pulse dc power supply 5 is connected again, thus forms the discharge loop of Metal Substrate emery wheel dressing in grinding process; When carrying out reaction-sintering SIC ceramic grinding, opening high frequency pulse power supply 5, making between Metal Substrate emery wheel 2 and reaction-sintering SIC pottery 8, to load upper discharge voltage (i.e. pulse voltage).Protruding abrasive particle 11 on Metal Substrate emery wheel 2 surface cuts when answering sintered sic pottery 8, and metallic bond surface and ceramic the treating of reaction-sintering SIC of Metal Substrate emery wheel 2 also exist gap between 8 finished surfaces, thus form the discharging gap needed for electric discharge.In the insulation emulsion environment that nozzle 13 provides, Metal Substrate emery wheel 2 and reaction-sintering SIC pottery treat that the pulse voltage between 8 makes insulation emulsion breakdown, form discharge channel 12, produce spark discharge.The metallic bond of Metal Substrate emery wheel 2 produces the removals such as melting, vaporization and evaporation under the TRANSIENT HIGH TEMPERATURE effect of spark discharge, thus make the abrasive particle in Metal Substrate emery wheel 2 micro-go out sword, reach the object of Metal Substrate emery wheel 2 dressing in grinding process, make the Metal Substrate emery wheel 2 in reaction-sintering SIC ceramic grinding process remain good sharp degree, thus improve the working (machining) efficiency of reaction-sintering SIC pottery accurate grinding.
The present embodiment ensures that in grinding process, Metal Substrate emery wheel remains sharp very well, reaches the object of the online dressing of Metal Substrate emery wheel in grinding process; Also can improve the working (machining) efficiency of reaction-sintering SIC pottery, compared with prior art, the working (machining) efficiency of the present embodiment reaction-sintering SIC pottery improves close to 10% simultaneously.
Claims (7)
1. the Metal Substrate emery wheel online electric spark dressing method in a reaction-sintering SIC ceramic grinding process, it is characterized in that it is that following steps complete: the electric conductivity utilizing Metal Substrate emery wheel and reaction-sintering SIC pottery, using Metal Substrate emery wheel and reaction-sintering SIC pottery as two electrodes of spark discharge, using the pulse power as the power supply of spark discharge, Metal Substrate emery wheel is connected with the positive pole of the pulse power, reaction-sintering SIC pottery is connected with the negative pole of the pulse power, using emulsified solution as the medium solution of spark discharge, by the spark discharge effect of pulse current in medium solution of the pulse power, the online electric spark dressing of Metal Substrate emery wheel in realization response sintered sic ceramic grinding process.
2. the Metal Substrate emery wheel online electric spark dressing method in a kind of reaction-sintering SIC ceramic grinding process according to claim 1, is characterized in that described reaction-sintering SIC pottery is connected with the negative pole of the pulse power by wire by brush.
3. the Metal Substrate emery wheel online electric spark dressing method in a kind of reaction-sintering SIC ceramic grinding process according to claim 1, it is characterized in that the described pulse power is high frequency pulse dc power supply, pulse voltage, the pulse current of high frequency pulse dc power supply and regulate according to the requirement of online electric spark dressing discharge time.
4. the Metal Substrate emery wheel online electric spark dressing method in a kind of reaction-sintering SIC ceramic grinding process according to claim 1, it is characterized in that described emulsified solution is for insulation emulsion, and the emulsion that insulate in reaction-sintering SIC ceramic grinding process injects discharging gap between Metal Substrate emery wheel and reaction-sintering SIC pottery in the mode of rushing liquid.
5. the Metal Substrate emery wheel online electric spark dressing method in a kind of reaction-sintering SIC ceramic grinding process according to claim 4, the discharging gap that it is characterized in that between described Metal Substrate emery wheel and reaction-sintering SIC pottery is the gap between the metallic bond surface of Metal Substrate emery wheel and the ceramic work surface of reaction-sintering SIC.
6. the Metal Substrate emery wheel online electric spark dressing method in a kind of reaction-sintering SIC ceramic grinding process according to claim 4, is characterized in that discharging gap between described Metal Substrate emery wheel and reaction-sintering SIC pottery is between 5 μm ~ 50 μm.
7. the Metal Substrate emery wheel online electric spark dressing method in a kind of reaction-sintering SIC ceramic grinding process according to claim 3, it is characterized in that the Metal Substrate emery wheel online electric spark dressing relevant parameter in described reaction-sintering SIC ceramic grinding process is as follows: pulse voltage is 60 ~ 120V, pulse current regulates within the scope of 0 ~ 50A, pulsed discharge width is 1 μ s ~ 99 μ s, and discharge interval is 0 μ s ~ 99 μ s.
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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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