CN103395002B - A kind of electric discharge machining in gas dressing of bulky diamond emery wheel repaiies neat method - Google Patents
A kind of electric discharge machining in gas dressing of bulky diamond emery wheel repaiies neat method Download PDFInfo
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- CN103395002B CN103395002B CN201310314120.4A CN201310314120A CN103395002B CN 103395002 B CN103395002 B CN 103395002B CN 201310314120 A CN201310314120 A CN 201310314120A CN 103395002 B CN103395002 B CN 103395002B
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Abstract
The electric discharge machining in gas dressing that the invention discloses a kind of bulky diamond emery wheel repaiies neat method, and this method is first fixed on grinding wheel spindle by skive, and conductive electrode is fixing in the horizontal plane, skive, electrode, electrographite brush, power supply and wire form discharge loop, positive source connects emery wheel, power cathode receiving electrode, skive makes linear reciprocating motion back and forth at electrode surface while rotating, the Pulse Electric spark produced between electrode and the metallic bond of emery wheel is utilized to be removed by metallic bond, diamond abrasive grain is made to go out sword from wheel face, the conduction chip simultaneously utilizing out the diamond abrasive grain of sword to cut copper electrode generation is rolled, between metallic bond, spark discharge is occurred, the TRANSIENT HIGH TEMPERATURE produced passes on the diamond abrasive grain cutting edge of contact cutting by chip, make its cutting edge tip gasification equating, reach emery wheel micro-go out sword dressing repair neat object, produce more Effective grains' number, realize high efficiency smooth mirror surface grinding.
Description
Technical field
The present invention relates to micro-dressing finishing and the Precision Machining field of ultrahard diamond emery wheel, the electric discharge machining in gas dressing being specifically related to a kind of bulky diamond emery wheel repaiies neat method.
Background technology
The contour performance hard brittle material of optics, glass, engineering ceramics has a wide range of applications, and its hardness is higher, and fracture toughness is low, is difficult to processing and not easily obtains high-quality surface.Not only dressing efficiency is low for traditional method for trimming such as abrasive lapping method, diamond pen dressing method and grinding mild steel method, also there is plastic precision and is difficult to control, the problems such as complicated operation.Occurred many new dressing technique in recent years, as methods such as laser reconditioning, electrochemical corrosion finishing, on-line purification, although improve dressing accuracy, these processing method efficiency are low, and production cost is high, and need unmanageable corrosive liquid.
Adopt oarse-grained metal-base diamond grinding wheel can carry out Precision Mirror Grinding for Ceramics processing to hard brittle material surface, but the plastic precision of metal-base diamond grinding wheel is difficult to control, and particularly the diamond grinding wheel dressing of coarseness is very difficult.
Summary of the invention
The object of the invention is to overcome the inefficient shortcoming of machine finish in prior art, there is provided a kind of bulky diamond emery wheel of electric discharge machining in gas micro-go out sword dressing repair neat method, can be used for carrying out Precision Mirror Grinding for Ceramics processing to hard brittle materials such as optical glass, pottery, carbide alloy.The method effectively can improve dressing efficiency, is suitable for the dressing after coarseness wheel loading and finishing, easy to control and do not need grinding fluid, is a kind of method for trimming of environmental protection.
The present invention adopts following technical scheme:
The electric discharge machining in gas dressing of bulky diamond emery wheel repaiies a neat method, comprises the steps:
Be fixed on by skive on the grinding wheel spindle of lathe, conductive electrode is fixing in the horizontal plane, and conductive electrode short transverse is vertical with the axis direction of grinding wheel spindle; By wire, direct current or the pulse power, skive, electrode and electrographite brush are connected and composed discharge loop; Skive does straight reciprocating motion at conductive circuit electrode surface while rotating with grinding wheel spindle.
First, pulse open-circuit voltage is applied between emery wheel and conductive electrode, when emery wheel produces spark discharge close to during electrode, make the spark discharge of noncontact Pulse Electric occurs between emery wheel and electrode in atmosphere, the metallic bond of emery wheel is removed, make diamond abrasive grain micro-go out sword, form skive cutting edge, complete skive dressing;
Then, continuous off-state voltage is applied between emery wheel and electrode, the diamond abrasive grain after sword is utilized out to continue to cut conductive electrode, make to come in contact spark discharge between emery wheel and electrode, the TRANSIENT HIGH TEMPERATURE simultaneously produced is delivered to emery wheel cutting edge by the chip rolled, by the gasification equating of described cutting edge tip, complete skive and go out sword surface and repair together.
Described conductive electrode is red copper conductive material.
Carry out noncontact at emery wheel and electrode and contact in combined discharge dressing process, the rotating speed of skive is 2000 ~ 5000 revs/min, feeding depth is 1 ~ 20 micron/every stroke, and feed speed is 100 ~ 500 millis m/min, and moving axially spacing is 0.5 ~ 5 millimeter;
In described discharge loop, skive connects the positive pole of power supply, and conductive electrode connects the negative pole of power supply.
Described pulse open-circuit voltage 50 ~ 80 volts, described continuous off-state voltage is 15 ~ 30 volts, and the pulse frequency of the described pulse power is 1000 ~ 5000Hz, and dutycycle is 30 ~ 60%
Described pulse open-circuit voltage is preferably 60V, and described continuous off-state voltage is preferably 24V.
Described skive is made up of diamond abrasive grain and bronze binding agent, described diamond abrasive granularity is 10 ~ 120 orders, concentration is 75 ~ 120%, and concentration refers to the diamond content (concentration of 100% represents that in every cubic centimeter volume, diamond content is 4.4 carats) of emery wheel unit volume.
Described conductive electrode is rectangular electrodes.
The present invention compared with prior art tool has the following advantages:
(1) under 60 volts of pulse voltages, contactless spark discharge is there is between skive and electrode, the Pulse Electric spark of continuous uniform can be produced, under 24 volts of DC voltages, formula spark discharge is come in contact between skive and electrode, can arc discharge be avoided, can not be burnt by skive.Compared with traditional carborndum hone machine finish method, greatly can improve finishing rate (abrasion of skive abrasion/electrode) and dressing efficiency (in the unit interval skive removal amount).
(2) compared with traditional carborndum hone machine finish method, consumption of electrode is few, does not need lapping liquid, is a kind of lower and diamond grinding wheel dressing method of environmental protection of cost.
(3) dressing repaiies the mirror grinding processing that the bulky diamond emery wheel together can be used for hard brittle material, can obtain the surface of high-quality light cleanliness.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of diamond wheel cutter electric discharge machining in gas of the present invention finishing;
Fig. 2 is that electric discharge machining in gas dressing of the present invention repaiies neat schematic diagram.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
As shown in Figure 1, a kind of electric discharge machining in gas dressing of bulky diamond emery wheel repaiies neat method, be fixed on by skive 1 on the grinding wheel spindle 2 of numerically control grinder, conductive electrode 4 is fixing in the horizontal plane, and described conductive electrode short transverse is vertical with the axis direction of skive.
By wire 6, skive 1, direct current or the pulse power 5, conductive electrode 4 and electrographite brush 3 are connected and composed discharge loop; In discharge loop, skive connects the positive pole of power supply, and electrode connects the negative pole of power supply; Skive, along with while grinding wheel spindle rotation, does straight reciprocating motion 7 at electrode surface.
First, the pulse voltage of 50 ~ 80V is applied between emery wheel and electrode, when emery wheel produces spark discharge close to during electrode, make between skive and electrode, to produce the spark discharge of noncontact Pulse Electric, the metallic bond of described emery wheel is removed, make skive abrasive particle 8 micro-go out sword, form skive cutting edge, reach the object of emery wheel dressing;
Then, the DC voltage of 15 ~ 30V is applied between emery wheel and electrode, the skive after sword is utilized out to continue to cut electrode, chip that the rake face of cutting edge is rolled and the metallic bond be cemented in around diamond abrasive grain is made to come in contact spark discharge 9 further, it is most advanced and sophisticated that the TRANSIENT HIGH TEMPERATURE produced is delivered to diamond wheel cutter cutting edge by conduction chip, as shown in Figure 2, by high-temperature gasification by the gasification equating of described cutting edge tip, make bulky diamond Grain protruding height matched gradually, reach skive go out sword surface repair neat object, thus high efficiency smooth mirror surface grinding can be realized.
Described skive does straight reciprocating motion at conductive circuit electrode surface, carries out noncontact with electrode and contacts combined discharge and repair; Grinding wheel speed is 2000 ~ 5000 revs/min, and feeding depth is 1 ~ 20 micron, and feed speed is 100 ~ 500 millis m/min, and moving axially spacing is 0.5 ~ 5 millimeter.When utilizing the pulse power (pulse frequency is 1000 ~ 5000Hz, and dutycycle is 30 ~ 60%) to carry out noncontact spark discharge dressing, open-circuit voltage is 50 ~ 80 volts; Utilize dc source to carry out contact spark discharge when repairing neat, open-circuit voltage is 15 ~ 30 volts.
Described conductive electrode material is the conductive materials such as red copper.Described skive is made up of diamond abrasive grain and bronze binding agent, diamond abrasive granularity is 10 ~ 120 orders, concentration is 75 ~ 120%, and concentration refers to the diamond content (concentration of 100% represents that in every cubic centimeter volume, diamond content is 4.4 carats) of emery wheel unit volume.
In discharge finishing process, if adopt suitable discharge voltage, rotating speed, feeding depth, feed speed and move axially spacing, the dressing efficiency of skive effectively can be improved.
Embodiment 1
Skive (diameter 150 millimeters, thick 2.5 millimeters) 1 is arranged on the grinding wheel spindle 2 of CNC precision grinder (SMRARTB818); Rectangular copper electrode (wide 51 millimeters, thick 12.9 millimeters) 4 is fixed on horizontal table, and its short transverse and grinding wheel spindle are to vertical; The granularity of skive 1 is 46 orders, and concentration is 100%, and metallic bond is bronze, and rectangular copper electrode 4 is red copper.
By wire 6, skive 1, copper electrode 4, electrographite brush 3, million are believed that RXN-605D dc source (or pulse power of permanent prestige science and technology MC-150/10) 5 and wire 6 connect and compose discharge loop;
As shown in Figure 1, skive does straight reciprocating motion 7 on copper electrode surface, and emery wheel connects positive source, and copper electrode connects power cathode.
First, pulse voltage 60V is applied between emery wheel and electrode, described pulse frequency is 5000Hz, dutycycle is 50%, make the spark discharge of noncontact Pulse Electric occurs between skive and electrode, thus the metallic bond of emery wheel removed, make diamond abrasive grain 8 micro-go out sword, form skive cutting edge, make emery wheel micro-go out sword dressing;
Then, the DC voltage of 24V is applied between emery wheel and electrode, the skive after sword is utilized out to continue to cut copper electrode, as shown in Figure 2, chip that the rake face of cutting edge is rolled and the metallic bond be cemented in around diamond abrasive grain is made to come in contact spark discharge 9 further, it is most advanced and sophisticated that the TRANSIENT HIGH TEMPERATURE produced is delivered to diamond wheel cutter cutting edge by conduction chip, by high-temperature gasification by the gasification equating of emery wheel cutting edge tip, boart boart wheel surface repaiied together.
Carry out noncontact at skive and electrode and contact in combined discharge dressing process, grinding wheel speed N=2000r/min, feed speed v
f=200mm/min, feeding depth a=2 μm, grinding wheel spindle is to moving interval f
z=1mm, pulse power open-circuit voltage is 60V, and dc source open-circuit voltage is 24V.
As adopted above-mentioned dressing parameter, can improve crushing efficiency more than 40%, skive surface energy is trimmed to smooth profile, is applicable to the Precision Mirror Grinding for Ceramics of hard brittle material.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (5)
1. the electric discharge machining in gas dressing of bulky diamond emery wheel repaiies a neat method, it is characterized in that, comprises the steps:
Skive is fixed on the grinding wheel spindle of lathe, conductive electrode is fixing in the horizontal plane, and conductive electrode short transverse is vertical with the axis direction of grinding wheel spindle, by wire, direct current or the pulse power, skive, electrode and electrographite brush are connected and composed discharge loop, skive does straight reciprocating motion at conductive circuit electrode surface while rotating with grinding wheel spindle;
First, between emery wheel and electrode, apply pulse open-circuit voltage, make the spark discharge of noncontact Pulse Electric occurs between emery wheel and electrode in atmosphere, the metallic bond of emery wheel is removed, make diamond abrasive grain micro-go out sword, form skive cutting edge, complete boart boart wheel surface and go out sword dressing;
Then, continuous off-state voltage is applied between emery wheel and electrode, the diamond abrasive grain after sword is utilized out to continue to cut conductive electrode, make to come in contact spark discharge between emery wheel and electrode, the TRANSIENT HIGH TEMPERATURE simultaneously produced is delivered to emery wheel cutting edge by the chip rolled, by the gasification equating of described cutting edge tip, complete boart boart wheel surface and repair together;
Described skive is made up of diamond abrasive and bronze binding agent, and described diamond abrasive granularity is 10 ~ 120 orders;
Described pulse open-circuit voltage is 60V, and described continuous off-state voltage is 24V.
2. method according to claim 1, is characterized in that, described conductive electrode is red copper conductive material.
3. method according to claim 1, it is characterized in that, carry out noncontact at emery wheel and electrode and contact in combined discharge dressing process, the rotating speed of described skive is 2000 ~ 5000 revs/min, feeding depth is 1 ~ 20 micron/every stroke, feed speed is 100 ~ 500 millis m/min, and moving axially spacing is 0.5 ~ 5 millimeter.
4. method according to claim 1, is characterized in that, in described discharge loop, skive connects the positive pole of power supply, and conductive electrode connects the negative pole of power supply.
5. method according to claim 1, is characterized in that, described pulse open-circuit voltage 50 ~ 80 volts, and described continuous off-state voltage is 15 ~ 30 volts, and the pulse frequency of the described pulse power is 1000 ~ 5000Hz, and dutycycle is 30 ~ 60%.
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| CN108177030A (en) * | 2018-01-30 | 2018-06-19 | 华南理工大学 | A kind of mirror grinding method of brait grinding wheel |
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| CN114654383B (en) * | 2022-04-18 | 2023-03-21 | 湖南大学 | Precise trimming method for concave arc metal bond diamond grinding wheel |
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