CN101481596A - Grinding wheel and use thereof for grinding hard-face roller - Google Patents
Grinding wheel and use thereof for grinding hard-face roller Download PDFInfo
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- CN101481596A CN101481596A CNA2008100325690A CN200810032569A CN101481596A CN 101481596 A CN101481596 A CN 101481596A CN A2008100325690 A CNA2008100325690 A CN A2008100325690A CN 200810032569 A CN200810032569 A CN 200810032569A CN 101481596 A CN101481596 A CN 101481596A
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Abstract
The invention relates to a grinding wheel which is characterized in that the grinding wheel has the following components: 30-35% of alumina, 30-35% of single alundum and 30-40% of carborundum, and the ratio between the alumina and the single alundum is 1:1. After being trimmed, the grinding wheel has two symmetric sections of width outer margins formed by a first sine curve and a second sine curve smoothly connected with the first sine curve. When the grinding wheel is used for grinding a high-speed steel roller, the rotation speed and the Z-axis speed of the grinding wheel can be reduced, however, the amount of feed is increased, and the grinding time is reduced. The grinding wheel has prolonged service life and reduces the time for the grinding wheel replacement and the labor intensity of grinder workers. The amount of sand and mud is reduced during the grinding so that the environment around a grinder can be improved; and the cost performance of the grinding wheel is remarkably improved.
Description
Technical field
The present invention relates to a kind of emery wheel, particularly relate to a kind of emery wheel that is used for grinding hard-face roller and in the application of grinding hard-face roller.
Background technology
The horizontal roll of domestic hot-rolled sheet strip steel pony roughing mill generally adopts half steel and high chromium steel roller, but when selecting the high-speed steel roll of high rigidity for use, grinding to its roll has just become more serious problem, because the grinding parameter of original emery wheel and grinding machine can't adapt to the ground finish of high-speed steel roll.
The structural constituent that typical high chromium steel and high-speed steel roll characterize wear resistance is compared as follows table 1
Table 1
The high rigidity organization decided of high-speed steel roll all be higher than high chromium steel roller in indexs such as hardness of roll body, ultimate compression strength and frictional coefficient, therefore high-speed steel roll has good rolling characteristic when producing the stainless steel roll bending.So use high-speed steel roll at pony roughing mill.
It is the resin wheel of corundum class abrasive material that roll grinder uses original emery wheel, is the emery wheel of PA30 as model, and this emery wheel is provided by Shanghai Resin Wheel Plant at present.Its front view and side-view are shown in 12, and wherein 1 is the grinding wheel width profile, and 2 is through hole.Before using, it is trimmed to width outer rim shape as shown in Figure 2 usually.As be made of the smooth width outer rim shape that is connected symmetric two sections circular arcs 6 and straight line 7, wherein the radius of circular arc 6 is generally 10 millimeters, and straight length is 70 millimeters for one section.
With this wheel grinding high chromium steel working roll, chromium 5 forged steel supporting rolls, high ferrochrome working roll etc., formed the sophisticated grinding process method of a cover.But this traditional grinding process method is when the grinding high-speed steel roll, and the abrasive dust thickness that every helical pitch occurred is little, and the grinding time is long, and emery wheel consumes high, and roller surface easily produces defectives such as polishing scratch, the problem of roll shape deterioration in accuracy.Therefore must redesign the grinding process method of high-speed steel roll.
Summary of the invention
The purpose of this invention is to provide the material, the emery wheel that are fit to the high-speed steel roll grinding; And the processing method of using the suitable high-speed steel roll grinding of this emery wheel, thereby effectively solve high-speed steel roll grinding problem, take into account the roll dressing of other kinds simultaneously, use the grinding of high rigidity rolls such as rapid steel to create conditions for pony roughing mill.
Removing material of the present invention, its moiety is: aluminum oxide 30～35%; Single alundum 30～35%; Silicon carbide 30～40%, and the ratio of aluminum oxide and single alundum is 1:1.
Emery wheel of the present invention, its moiety is: aluminum oxide 30～35%; Single alundum 30～35%; Silicon carbide 30～40%, and the ratio of aluminum oxide and single alundum is 1:1.
In removing material of the present invention and grinding wheel formula, aluminum oxide is high performance new type abrasive; Single alundum has been the effect of skeleton; Silicon carbide is conventional abrasive material.
Aluminum oxide: play main shear action.The abrasive grain shape is sharp-pointed, and the granule interior structure is a polycrystal, can effectively be cut in the harder material.
Single alundum: play the balance roller surface quality.Form a lot of ditch (drawing the road) with the aluminum oxide cutting, single alundum can scabble crest, and with extrusion process trough is filled and led up.The proportioning of aluminum oxide and single alundum is advisable with 1:1, and the too high meeting of alumina ration causes the polishing scratch of roller surface; The ratio of single alundum is too high can to reduce grinding efficiency.
Silicon carbide: belong to basic abrasive material, shape also is a tip shape, and the hardness ratio aluminum oxide is slightly lower, uses the ratio of silicon carbide mainly to be based on the consideration of emery wheel cost performance in the present invention.
Because the sharp characteristic of alumina abrasive particulate, with the emery wheel of the corundum class abrasive material of prior art relatively, grinding MC, M as shown in Table 1 apace
2C high rigidity carbide.
High performance alumina abrasive forms through special seeding gel systems sintering, is abrasive material of new generation, has the hardness height, good toughness, advantage such as sharpness is strong.Compare with corundum abrasive and to have the wear resistance ratio height, conformality is strong, and the workpiece surface processing quality is good, and the crushing amount is few, superiority such as grinding efficiency height.
Emery wheel of the present invention is still made according to the flow process of routine: as, select materials-weigh-batch mixing-compacting-drying-curing-geometrical dimension processing-balance revolution test-packing-warehouse-in etc.
Preferably, emery wheel of the present invention is after the process finishing, its outline shape up and down in the width cross section is: by symmetric two section first sinusoidal curve and the width outer rim that constitutes with its smooth second sinusoidal curve that is connected between this two section first sinusoidal curve, wherein, the ratio of the second sinusoidal curve chord length and the first sinusoidal curve chord length is 7～10, the second sinusoidal curve action and the ratio of the first sinusoidal curve action is 0.001～0.004.This proportionlity is by emery wheel symmetric bight curve and the decision of intermediate curve geometrical shape.If the ratio of chord length is excessive, cause that the curve in bight shortens, the easy explosion in the bight of grinding process medium plain emery wheel; The ratio of chord length is too small, causes that the curve of emery wheel middle part shortens, and grinding efficiency is descended.The ratio of action is too small, and grinding initial period ground effect descends; If the ratio of action is excessive, the grinding ratio of emery wheel descends.
According to the present invention, preferably, the described first sinusoidal chord length is that 8～10 millimeters, action are 4～5 millimeters; The second sinusoidal chord length is that 70～74 millimeters, action are 0.004～0.016 millimeter.According to Principle of Grinding and Cutting, second sinusoidal curve needs less radius-of-curvature as the major portion of grinding roller, improves grinding efficiency.
According to the present invention, preferably, described first sinusoidal curve and the second sinusoidal angle are 88～90 degree.
According to the present invention, preferably, the diameter of emery wheel is 915 millimeters of Φ.
Emery wheel of the present invention has the good little sword of contour.
Emery wheel of the present invention preferably is applied to the grinding high-speed steel roll.
With reference to the standard of grinding machine process specifications (grinding machine process specifications, grinding machine model WS3CP50.201*6000, manufacturer Germany WALDRICH SEIGEN):
Grinding wheel speed maximum value 45 meter per seconds;
Emery wheel along roll mandrel to 6000 millimeters/minute of the travel speed maximum values of (Z axle);
Emery wheel is along roll 1000 millimeters/minute of the speed of feed maximum values of (X-axis) radially.
The technology of wheel grinding high-speed steel roll of the present invention comprises:
Grinding wheel speed: 40～45 meter per seconds;
Z axle speed: 1800～1900 millimeters/minute;
Continuous feed amount: 70～80 microns;
The edge depth of cut: 8～10 microns;
The grinding time: 40～45 minutes;
Process redundancy: 0.8～0.9 millimeter.
Emery wheel: the rotating speed maximum value can not surpass code requirement; Rotating speed is too low can to reduce grinding efficiency.
Z axle speed: speed is too big, and the roll roll surface can produce defectives such as polishing scratch after the grinding; Speed is too little can to reduce grinding efficiency.Suitable Z axle speed is 1800～1900 millimeters/minute.
The depth of cut: value is too big, can cause that the grinding load surpasses code requirement; Value is too little, can reduce grinding efficiency.Therefore the suitable edge depth of cut is 8～10 microns.
Advantageously, the grinding characteristics of emery wheel of the present invention are utilization accurate grinding technology, and meticulous trimming wheel makes the fine fragmentation of abrasive particle and produces the little sword with fine contour, as shown in Figure 1.These contour little swords can excise the atomic thin surplus that still has some micro-defectives and micro-shape error and scale error from workpiece surface.
Emery wheel abrasive dust formula
During external grinding, the rough and ready formula of the thickness formula a of abrasive dust is:
Wherein:
The thickness of a-abrasive dust (mm);
Vw-workpiece circumferential speed (m/min);
Vo-emery wheel circumferential speed (m/s);
Ap-back engagement of the cutting edge (mm);
Do-grinding wheel diameter (mm);
Dw-diameter of work (mm);
Abrasive particle number in M-emery wheel circumference unit length.
Emery wheel of the present invention makes emery wheel circumferential speed Vo descend; The interior abrasive particle of emery wheel circumference unit length is counted M and is diminished; Back engagement of the cutting edge Ap increases, thereby the thickness a value that causes abrasive dust rises.
Therefore, the Z axle speed of grinding wheel speed and emery wheel diminishes, but the depth of cut increases the grinding time decreased.
Emery wheel of the present invention is applied to the grinding high-speed steel roll, and grinding wheel speed and Z axle speed are lower than former emery wheel, but the depth of cut of this emery wheel is greater than former emery wheel; In the corase grind stage of roll, the reasonable original roll forming that will grind the hardened layer of roll surface apace and recover roll that contacts of slick convex outer rim of emery wheel and irregular spill roll surface, efficient obviously improves; Roll surface does not have defectives such as polishing scratch, volution, burn after the grinding, and roughness value is Ra1.5～1.6 micron, has satisfied the specification of quality of roll roll surface.
Emery wheel of the present invention is applied to the grinding high-speed steel roll, and prolonged the work-ing life of emery wheel, reduces the time of replacing emery wheel and grinding machine worker's labour intensity; Sand mud amount during grinding reduces, and can improve grinding machine environment on every side; The cost performance of emery wheel significantly improves.
Description of drawings
Fig. 1 is the shape synoptic diagram of the emery wheel of prior art.
Fig. 2 is the width shape synoptic diagram of the emery wheel of prior art.
Fig. 3 is the width shape synoptic diagram of an embodiment of emery wheel of the present invention.
Fig. 4 is the contour synoptic diagram of the little sword of explanation abrasive particle.
Fig. 5 is the synoptic diagram of wheel grinding roll of the present invention.
Description of reference numerals
1 grinding wheel width profile
2 through holes
3 level lines
4 abrasive particles
5 little swords
6 arc sections
7 straight-line segments
10 emery wheels
11 first sinusoidal sections
12 second sinusoidal sections
13 grinding wheel width profiles
14 emery wheel strokes
20 rolls
Embodiment
Below in conjunction with accompanying drawing and by a specific embodiment the present invention is carried out comparatively detailed explanation.
Embodiment
1, the making of emery wheel:
● the composition of emery wheel: aluminum oxide 30%, single alundum 30%, silicon carbide 40%.
● the process of emery wheel making:
Raw material is prepared: the part by weight according to aluminum oxide, single alundum and silicon carbide is selected materials, is weighed.The hardness of all abrasive materials is neutral hardness, granularity be 36/time, 550 microns of diameters.(referring to the emery wheel standard, ANSI (American National Standards Institute) B7.1)
Emery wheel is shaped: add resinoid bond through behind the sufficient stir mixing at three kinds of abrasive materials, by the pressing machine press forming, solidify through emery wheel after the drying treatment then.
Mechanical workout: the emery wheel blank is through finishing geometrical dimension processing after polishing.
Performance test: security test---balance revolution test; Hardness test.
Packing, warehouse-in.
Wherein, except the abrasive ingredients that is adopted is formed difference, make according to the common process process.
Except above-mentioned emery wheel, removing material can also be made other any forms that is applicable to the grinding high-speed steel roll.
2, the finishing of emery wheel
On numerically control grinder, we have worked out the crushing program according to the smooth curve shape that the sinusoidal curve of two kinds of combinations is formed, and just can realize trimming wheel automatically.
The width profile of emery wheel after finishing as shown in Figure 3.Wherein the last bottom profiled of width constitutes the smooth width outer rim shape that is connected by symmetric two section first sinusoidal curve 6 with middle one section second sinusoidal curve 7.Sinusoidal characteristic parameter has three: chord length, action and angle.Wherein, symmetric two section first sinusoidal chord length be 10 millimeters, action be 5 millimeters, and angle be 90 degree; The intermediary second sinusoidal chord length be 70 millimeters, action be 0.01 millimeter, and angle be 90 degree.
Fig. 4 is the contour synoptic diagram of the little sword of abrasive particle of the emery wheel that obtains of method of the present invention.
As can be seen from Figure 4, emery wheel of the present invention is through adamantine finishing, and its sharpness shows as on microcosmic evenly, and is tough and tensile, adapts to the grinding of the high-speed steel roll of high rigidity.
3, the grinding of roll
On numerically control grinder, we carry out grinding program according to the grinding curve of setting, and finish the grinding operation of roll.
The main contents of grinding program comprise:
● to the measurement of the grinding wheel diameter after the finishing;
● the measurement of roll geometric parameter before the grinding;
● roughly grind, finish grind according to grinding process parameters breaker roll after the improvement of setting;
● operations such as the measurement of roll geometric parameter, automatic flaw detection after the grinding;
● to the geometric parameter of roll after the grinding and the printing of detection record.
The wheel grinding high-speed steel roll, as shown in Figure 5.Its medium plain emery wheel 10 carries out grinding along emery wheel stroke 14 breaker rolls 20.
After roll used, because uneven wear, the shape of roll surface was irregular spill; The work hardening layer hardness of roll surface reaches about 90Hs usually.In the corase grind stage of roll, the reasonable original roll forming that will grind the hardened layer of roll surface apace and recover roll that contacts of slick convex outer rim of emery wheel of the present invention and irregular spill roll surface.
The main technologic parameters of two kinds of wheel grinding high-speed steel rolls sees Table 2.
Table 2
| Index | The process redundancy millimeter | Grinding time minute | The grinding wheel speed meter per second | Z axle speed millimeter/minute | The continuous feed amount, micron | The edge depth of cut, micron |
| Prior art | 0.8～0.9 | 50～55 | 40～45 | 2500～2600 | 60～70 | 8～10 |
| The present invention | 0.8～0.9 | 40～45 | 33～38 | 1800～1900 | 70～80 | 8～10 |
Annotate: Z axle speed is meant the travelling speed of emery wheel along the roll line direction
As can be seen from the above table, the Z axle speed of grinding wheel speed and emery wheel diminishes, but the depth of cut increases, thus the grinding time decreased.
The general data of two kinds of wheel grinding rolls sees Table 3.
Table 3
| The emery wheel type | The present invention | Prior art PA30 |
| The grinding roller number | 125 | 118 |
| Grinding time total (minute) | 5507 | 6288 |
| The average grinding time (minute) | 44.06 | 53.29 |
| Grinding ratio | 3.24 | 1.41 |
Annotate: grinding ratio is meant the roll volume (mm that per second grinds away
3) with the volume (mm of abrasion of grinding wheel
3) ratio.
4, the processing of accident roll
Rapid steel accident roll shows as roll surface and has crackle by 2～3 millimeters, and according to technological process, the grinding of roll must be clean these crackle grindings.
When the grinding high-speed steel roll, the abrasive dust thickness that every helical pitch occurred is little according to traditional grinding process method for original emery wheel, and the grinding time is long, and emery wheel consumes high, and roller surface easily produces defectives such as polishing scratch, the feature of roll shape deterioration in accuracy.
Characteristics such as new emery wheel has good toughness, and sharpness is strong, after the crushing before the grinding, according to the grinding process parameters after improving, the grinding efficiency height, good grinding quality, net effect is obvious.
Two kinds of emery wheel grinding data contrasts when handling rapid steel accident roll see Table 4.
Table 4
| The emery wheel type | The present invention | Prior art PA30 |
| The grinding roller millimeter | 8.59 | 5.81 |
| Grinding time total (minute) | 460 | 654 |
Adopt emery wheel of the present invention that high-speed steel roll is carried out grinding, its useful result is as follows:
Emery wheel of the present invention can reach 11～12 days duration of service; The emery wheel PA30 of prior art is general to be used 3～3.5 days.Therefore use emery wheel of the present invention to reduce and change the time of emery wheel and reduced grinding machine worker's labour intensity.
During wheel grinding of the present invention, sand mud amount reduces, and has improved the environment around the grinding machine.
Emery wheel of the present invention has not only improved production efficiency, and its cost performance has improved.
More than describe the present invention and effect thereof in detail by specific embodiment, but be not limited only to this embodiment, without departing from the inventive concept of the premise, more other equivalent embodiment can also be arranged.
Claims (9)
1. a removing material is characterized in that, moiety is: aluminum oxide 30～35%; Single alundum 30～35%; Silicon carbide 30～40%, and the ratio of aluminum oxide and single alundum is 1:1.
2. an emery wheel is characterized in that, moiety is: aluminum oxide 30～35%; Single alundum 30～35%; Silicon carbide 30～40%, and the ratio of aluminum oxide and single alundum is 1:1.
3. emery wheel according to claim 2, it is characterized in that, the outline shape up and down in described grinding wheel width direction cross section is: symmetric two section first sinusoidal curve and the width outer rim that constitutes with its smooth second sinusoidal curve that is connected between this two section first sinusoidal curve, wherein, the second sinusoidal curve chord length is that 7～10, the second sinusoidal curve action is 0.001～0.004 with the first sinusoidal curve action ratio with the first sinusoidal curve chord length ratio.
4. emery wheel according to claim 3 is characterized in that, the described first sinusoidal chord length is that 8～10 millimeters, action are 4～5 millimeters; The second sinusoidal chord length is that 70～74 millimeters, action are 0.004～0.016 millimeter.
5. emery wheel according to claim 4 is characterized in that, described first sinusoidal curve and the second sinusoidal angle are 88～90 degree.
6. according to each described emery wheel in the claim 2～5, it is characterized in that the diameter of emery wheel is 915 millimeters of Φ.
7. according to each described emery wheel in the claim 2～5, it is characterized in that emery wheel has the good little sword of contour.
8. each described emery wheel application in the grinding high-speed steel roll in the claim 2～5.
9. the technology of each described wheel grinding high-speed steel roll in the claim 2～5 comprises:
Grinding wheel speed: 40～45 meter per seconds;
Z axle speed: 1800～1900 meter per seconds;
Continuous feed amount: 70～80 microns;
The edge depth of cut: 8～10 microns;
The grinding time: 40～45 minutes;
Process redundancy: 0.8～0.9 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100325690A CN101481596B (en) | 2008-01-11 | 2008-01-11 | Grinding wheel and use thereof for grinding hard-face roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100325690A CN101481596B (en) | 2008-01-11 | 2008-01-11 | Grinding wheel and use thereof for grinding hard-face roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101481596A true CN101481596A (en) | 2009-07-15 |
| CN101481596B CN101481596B (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100325690A Expired - Fee Related CN101481596B (en) | 2008-01-11 | 2008-01-11 | Grinding wheel and use thereof for grinding hard-face roller |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101691028B (en) * | 2009-09-22 | 2011-02-09 | 武汉法山磨料磨具有限公司 | Manufacturing method for resin grinding wheel cutting piece with function of cutting soft and hard materials |
| CN110193759A (en) * | 2019-05-13 | 2019-09-03 | 本钢板材股份有限公司 | A kind of high-precision cold roll grinding control method |
| CN112276698A (en) * | 2020-06-30 | 2021-01-29 | 武汉钢铁有限公司 | Grinding method for controlling short scratches on surface of cold roller |
| CN112405146A (en) * | 2020-11-27 | 2021-02-26 | 宝钢轧辊科技有限责任公司 | Method for grinding high-speed steel roller |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5139539A (en) * | 1981-12-15 | 1992-08-18 | Minnesota Mining And Manufacturing Company | Alumina bonded abrasive for cast iron |
| US5104424A (en) * | 1989-11-20 | 1992-04-14 | Norton Company | Abrasive article |
-
2008
- 2008-01-11 CN CN2008100325690A patent/CN101481596B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101691028B (en) * | 2009-09-22 | 2011-02-09 | 武汉法山磨料磨具有限公司 | Manufacturing method for resin grinding wheel cutting piece with function of cutting soft and hard materials |
| CN110193759A (en) * | 2019-05-13 | 2019-09-03 | 本钢板材股份有限公司 | A kind of high-precision cold roll grinding control method |
| CN112276698A (en) * | 2020-06-30 | 2021-01-29 | 武汉钢铁有限公司 | Grinding method for controlling short scratches on surface of cold roller |
| CN112405146A (en) * | 2020-11-27 | 2021-02-26 | 宝钢轧辊科技有限责任公司 | Method for grinding high-speed steel roller |
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| Publication number | Publication date |
|---|---|
| CN101481596B (en) | 2012-05-30 |
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