CN101190504A - Method for finishing metal binding agent CBN abrasive wheel by combining laser and machinery - Google Patents
Method for finishing metal binding agent CBN abrasive wheel by combining laser and machinery Download PDFInfo
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- CN101190504A CN101190504A CNA2006101367846A CN200610136784A CN101190504A CN 101190504 A CN101190504 A CN 101190504A CN A2006101367846 A CNA2006101367846 A CN A2006101367846A CN 200610136784 A CN200610136784 A CN 200610136784A CN 101190504 A CN101190504 A CN 101190504A
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Abstract
The invention provides a method which finishes a metal bonder CBN grinding wheel through the composition of laser and mechanism, comprising: adopting high power density pulse laser, focusing a laser beam by focusing lens and irradiating vertically to the grinding surface of the grinding wheel, rotating a grinding wheel, measuring the fluctuation of the grinding wheel round, adjusting the focus position of the laser to lead the focus to be dropped at the maximum position of the fluctuation of the round, adjusting the parameter of the laser in order to lead the maximum position of the fluctuation of the grinding wheel round to reach the value, axially and repeatedly feeding and rotating the grinding wheel till CBN grinding grain part close to the maximum position of the fluctuation round is wholly removed or partly and slightly removed or partly lost with the holding force owning to the removal of the bonder by a plurality of finishing, shaping the grinding wheel by using a single-crystal diamond pen or a carborundum idler wheel with definite tip, removing the grinding grain which loses the holding force and the grinding grain metamorphosing layer burned by laser, and repeatedly carrying out the composition processes till required round fluctuation and topography and geomorphology are reached. The invention obviously improves the finishing efficiency of the grinding wheel and leads the cutting surface of the grinding wheel to obtain excellent topography and geomorphology.
Description
Technical field
The present invention relates to the Metal-bonded CBN grinding wheel dressing method, further be meant the method that adopts laser and mechanical compound finishing and realize the precision truing and the dressing of Metal-bonded CBN emery wheel.
Background technology
Metal-bonded CBN (cubic boron nitride) emery wheel has unusual good grinding performance, has wide practical use in grinding, accurate ultra grinding, plunge grinding, high efficient grinding and the grinding automation of difficult-to-machine material.In recent years, because correlation techniques such as emery wheel manufacturing, numerically-controlled precise grinding machine are broken through, this emery wheel is used sharply to be increased.Because this emery wheel self character, repair very difficult, dressing accuracy cannot say for sure the card, make grinding efficiency, precision, quality be a greater impact, having had a strong impact on giving full play to of its good grinding performance, is the key technology difficult problem in its bottleneck problem further applied and the numerically-controlled precise grinding machine.
The finishing of Metal-bonded CBN emery wheel is divided into shaping and dressing two procedures usually: shaping is emery wheel to be carried out trace remove, and makes emery wheel reach desired geometrical precision; Dressing is by removing the bond between the emery wheel abrasive particle, make abrasive particle protrude the bond certain height, form cutting edge, producing enough chip spaces simultaneously.The height of emery wheel dressing precision has determined the dimensional accuracy of institute's processing work.
Traditional complete machine finish method based on power is difficult to adapt to the Metal-bonded CBN crushing.At present ripe online electrolysis method finishing metal binding agent CBN emery wheel only can carry out dressing, can not carry out shaping, and the dressing accuracy of the above emery wheel of micro powder grade is difficult to reach requirement.For this reason, seek a kind of suitable Metal-bonded CBN emery wheel can shaping again can dressing new method, become the target and the focus of various countries' scholar's research.
Summary of the invention
The problem to be solved in the present invention is, the extremely difficult problem of finishing at Metal-bonded CBN emery wheel in the prior art, the method of a kind of laser and mechanical finishing metal binding agent CBN abrasive wheel by combining is proposed, this method can realize precision truing to described emery wheel, simultaneously can carry out dressing again, thereby obtain good topography and geomorphology; Satisfy requirement efficient, accurate grinding.
Technical scheme of the present invention is to adopt focusing back power density to reach and remove CBN power density threshold value 1.3 * 10
8W/cm
2Above high power density pulse laser, implement following processing step:
(1) at the non-formed grinding wheel of Metal-bonded CBN, laser beam is focused on vertical wheel grinding face irradiation by condenser lens;
(2) revolving wheel is measured the emery wheel circle by amesdial and is beated, and adjusts focal position of laser, makes focus drop on the round maximum of beating;
(3) adjust laser parameter, make the emery wheel circle maximum of beating reach described removals CBN power density threshold value, thus removal CBN and metallic bond;
(4) described emery wheel reciprocating feed vertically, emery wheel is done gyration simultaneously, ablate through several times, near its circle is beated maximum CBN abrasive particle part by whole peel off, part by trace remove, part loses hold because bond removes;
(5) then, use single-crystal diamond pen or the described emery wheel of carborundum pair of rollers to carry out shaping, remove and lose the abrasive particle of hold and by the abrasive particle metamorphic layer of laser ablation with clear and definite point of a knife;
(6) repeat the recombination process that above laser reconditioning and Mechanical Method shaping hocket, beat and topography and geomorphology until reaching required circle.
Below the present invention made further specify.
Among the present invention, the continuous output mean power of described laser can be 0-40W, repetition rate 0.5kHz-10kHz, pulsewidth 160ns-500ns; Described grinding wheel speed is 1-2m/s; The focal length of described laser is 15mm-30mm, the spot diameter 0.20mm-0.22mm behind the pulse laser focusing.
In the technical process of the present invention, measure the emery wheel circle by amesdial and beat, adjust focal position of laser, make focus drop on the round maximum (laser ablation power maximum herein) of beating; Reduce along with beating, radially laser focusing begins out of focus, makes power density reduce, less than ablation power density threshold value.So only near the maximum of beating, just can remove CBN, each pulse removal amount is at micron order, adjust suitable kinematic parameter, make the ablation pit tangent or overlap, through after the several times revolutions, circle beat near the maximum CBN abrasive particle part by whole peel off, part by trace remove, part loses hold because bond removes.
Reduce along with beating with emery wheel during the emery wheel revolution, laser is radiated at the wheel face hot spot and increases gradually, power density can reduce gradually, then adjust laser parameter, as (power density are subjected to these parameter influences) such as mean power, repetition rate (pulsewidth and peak power), defocusing amounts, the feasible maximum of beating reaches ablation power density threshold value, thereby removes CBN and metallic bond.
Know-why of the present invention is, in order to overcome the defective of prior art, by theoretical research and a large amount of test optimization, set up a kind of compound dressing method, be at first to avoid " confronting the tough with toughnees " in the process, employing is repaired in advance based on the method for the laser ablation retrofit of microcell heat effect, adopts the Mechanical Method shaping with clear and definite point of a knife then.
The method of above-mentioned laser of the present invention and mechanical finishing metal binding agent CBN abrasive wheel by combining has significantly improved Metal-bonded CBN crushing efficient and has made the wheel grinding face obtain good topography and geomorphology than prior art; Satisfy requirement efficient, accurate grinding.Fig. 1 is the surface topography of observing before the bronze binding agent CBN crushing, surfacing, and abrasive particle protrudes not high; Fig. 2 is for adopting the surface topography after diamond roller was repaired in 10 hours, and the circle runout error is reduced to 30 μ m from 90 μ m, and it is poor mainly to show surface topography, and abrasive particle protrudes not high; Fig. 3 is 3 hours surface topography of composite algorithm finishing, and the circle runout error is reduced to 4 μ m from 90 μ m, and surface topography is good.
Description of drawings
Fig. 1 is the surface topography of observing before the crushing;
Fig. 2 is the surface topography of diamond roller trimming;
Fig. 3 is the surface topography of composite algorithm finishing;
Fig. 4 is a kind of embodiment frock schematic diagram of implementing the inventive method, wherein:
1-high power density pulse laser, 2-condenser lens, 3-Metal-bonded CBN emery wheel, 4-single-point diamond pen or SiC roller, 5-grinding machine.
The specific embodiment
Fig. 4 is a kind of embodiment of laser of the present invention and mechanical finishing metal binding agent CBN abrasive wheel by combining method.
Wherein:
High power density pulse laser 1 adopts the power density threshold value can reach 1.3 * 10
8W/cm
2Acousto-optic Q modulation YAG pulse laser, export mean power 0-40W continuously, repetition rate 0.5kHz-10kHz, pulsewidth 160ns-500ns;
The focal length of condenser lens 2 is 30mm, the spot diameter 0.22mm behind the pulse laser focusing.
Metal-bonded CBN emery wheel 3 rotating speeds are 1-2m/s;
Measure the emery wheel circle with amesdial and beat, write down the highest place of beating, if new emery wheel, circle is beated and is often beated greater than 0.1mm; Open laser instrument output small-power pulse laser, regulate grinding machine 5, rotate emery wheel 3, transfer, make focus drop on the highest point of beating with the thin sheet of metal examination; Increase laser power gradually, reach and remove CBN threshold value 1.3 * 10
8W/cm
2, for making CBN ablation metamorphic layer few, should adopt low pulse frequency, narrow pulsewidth; Emery wheel is feeding vertically, through several times back and forth after the finishing, along near the CBN abrasive particle part peak by whole peel off, part by trace remove, part loses hold because bond removes; Then adopt single-crystal diamond pen 4 or the shaping of carborundum roller; After the portion C BN abrasive particle of waiting to lose hold comes off, measure the emery wheel circle with amesdial and beat, if reach requirement then finish.Whether passable, if need further remove bond, then turn down power density and remove below the power density threshold value to the CBN abrasive particle if detecting topography and geomorphology again, metallic bond removal power density threshold value is above, and (it is 1.5 * 10 that bronze binding agent is removed the power density threshold value
7W/cm
2), carry out dressing, to reaching requirement.If circle is beated do not reach requirement then repeat laser shaping and dressing, Mechanical Method shaping process.
Claims (4)
1. the method for laser and mechanical finishing metal binding agent CBN abrasive wheel by combining is characterized in that, this method is to adopt focusing back power density to reach and remove CBN power density threshold value 1.3 * 10
8W/cm
2Above high power density pulse laser, implement following processing step:
(1) at the non-formed grinding wheel of Metal-bonded CBN, laser beam is focused on vertical wheel grinding face irradiation by condenser lens;
(2) revolving wheel is measured the emery wheel circle by amesdial and is beated, and adjusts focal position of laser, makes focus drop on the round maximum of beating;
(3) adjust laser parameter, make the emery wheel circle maximum of beating reach described removals CBN power density threshold value, thus removal CBN and metallic bond;
(4) described emery wheel reciprocating feed vertically, emery wheel is done gyration simultaneously, ablate through several times, near its circle is beated maximum CBN abrasive particle part by whole peel off, part by trace remove, part loses hold because bond removes;
(5) then, use single-crystal diamond pen or the described emery wheel of carborundum pair of rollers to carry out shaping, remove and lose the abrasive particle of hold and by the abrasive particle metamorphic layer of laser ablation with clear and definite point of a knife;
(6) repeat the recombination process that above laser reconditioning and Mechanical Method shaping hocket, beat and topography and geomorphology until reaching required circle.
2. according to the method for described laser of claim 1 and mechanical finishing metal binding agent CBN abrasive wheel by combining, it is characterized in that the continuous output mean power 0-40W of described laser, repetition rate 0.5kHz-10kHz, pulsewidth 160ns-500ns.
3. according to the method for described laser of claim 1 and mechanical finishing metal binding agent CBN abrasive wheel by combining, it is characterized in that grinding wheel speed is 1-2m/s.
4. according to the method for described laser of claim 1 and mechanical finishing metal binding agent CBN abrasive wheel by combining, it is characterized in that the focal length of described laser is 15mm-30mm, the spot diameter 0.20mm-0.22mm behind the pulse laser focusing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101367846A CN101190504A (en) | 2006-11-30 | 2006-11-30 | Method for finishing metal binding agent CBN abrasive wheel by combining laser and machinery |
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| CNA2006101367846A CN101190504A (en) | 2006-11-30 | 2006-11-30 | Method for finishing metal binding agent CBN abrasive wheel by combining laser and machinery |
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| CN101190504A true CN101190504A (en) | 2008-06-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115026722A (en) * | 2022-05-19 | 2022-09-09 | 湖南科技大学 | Method for monitoring laser trimming efficiency of formed grinding wheel based on spectrum and vision assistance |
-
2006
- 2006-11-30 CN CNA2006101367846A patent/CN101190504A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115026722A (en) * | 2022-05-19 | 2022-09-09 | 湖南科技大学 | Method for monitoring laser trimming efficiency of formed grinding wheel based on spectrum and vision assistance |
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Open date: 20080604 |