CN113305649B - Grinding method of high-strength tool steel roller for medium plate - Google Patents
Grinding method of high-strength tool steel roller for medium plate Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
- B24B5/37—Single-purpose machines or devices for grinding rolls, e.g. barrel-shaped rolls
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Abstract
A grinding method of a high-strength tool steel roller for medium plates comprises coarse grinding, semi-fine grinding and fine grinding, wherein in the coarse grinding stage, the linear speed of a grinding wheel is controlled to be 30-40M/S, the rotating speed of the roller is 25-30 r/min, and the grinding current pressure is controlled to be 20-54M%; in the semi-fine grinding stage, the linear speed of the grinding wheel is controlled to be 30-40M/S, the rotating speed of the roller is 20-25 r/min, and the grinding current pressure is more than or equal to 25M%; in the fine grinding stage, the linear speed of the grinding wheel is controlled to be 30-40M/S, the rotating speed of the roller is 30-35 r/min, and the grinding current pressure is less than 20M%. The application provides a new grinding technology, can obviously improve grinding efficiency, and the efficient has reduced the horizontal chatter marks in roll surface simultaneously, and has guaranteed circularity and cylindricity requirement, and the roughness reaches more than 3.2.
Description
Technical Field
The application relates to the field of machining, in particular to a grinding process of a high-strength tool steel roller for a medium plate.
Background
The medium plate is a steel plate with the thickness of 4.5-25.0 mm, is mainly applied to the fields of building engineering, machine manufacturing, container manufacturing, shipbuilding, bridge construction and the like, is also a main processing raw material for manufacturing parts such as various containers, furnace shells, furnace plates, bridges, automobile static steel plates, low alloy steel plates, shipbuilding steel plates, boiler steel plates, pressure vessel steel plates, figured steel plates, automobile girder steel plates, certain parts of tractors, welding components and the like, and has wide application. In recent years, the quality requirement of medium and thick plate products in the market is also sharply improved, and meanwhile, the intense competition also requires that the production cost of the medium and thick plate products is reduced by obviously improving technical and economic indexes, the use cost of the roller is influenced by the use technology of the roller, and key indexes such as the quality stability of the medium and thick plate products, the daily operation rate of a rolling mill, the consumption of steel billets and the like are all influenced, so that the roller technology needs to be deeply researched.
At present, high nickel-chromium rollers are generally used in the industry to produce medium plate steel, and have excellent wear resistance, and the high nickel-chromium rollers are characterized in that the surface layers of the rollers do not have white cast iron layers, but precipitate fine graphite to form a structure in which cementite, pearlite and graphite coexist, the quantity of the precipitated graphite towards the core parts of the rollers is increased, and the precipitated graphite is enlarged, so that the hardness of the cross sections of the rollers is reduced gently, and the cores still keep equivalent hardness, and the high nickel-chromium rollers are particularly suitable for production conditions that the stability of a rolling process is poor and steel is frequently clamped, but the wear resistance of the high nickel-chromium rollers is poor (Wang Guanshan, application of high chromium cast iron working rollers on medium plate rolling mills, 2010). According to the statistics of the current rolling condition, the wear of the high-nickel complex roller is phi 1mm after the high-nickel complex roller rolls 3000 tons, and the hardness is 60-65 HSD. With the high-speed development and high-efficiency requirements of steel rolling equipment and the high precision of the size of a rolled product, a high nickel-chromium roller obviously cannot meet the current rolling requirements and requirements.
The patent CN106350730A proposes a high wear-resistant alloy tool steel roll and its manufacturing method, the surface hardness of the tool steel roll working layer reaches 79-84 HSD, when applied to a hot strip continuous rolling mill, the chromium iron roll with higher millimeter rolling quantity is increased by more than 50%, and when applied to a medium-width thick plate rolling mill, the higher chromium iron roll is increased by more than 100%. Patent CN103526126A proposes a tool steel roll for rolling a medium plate and a manufacturing method thereof, which effectively improves the mechanical properties of a working roll of a rolling mill through reasonable design of alloy components and processing technology, the hardness of the tool steel roll reaches 75-80 HSD, the wear resistance and millimeter rolling quantity of the roll are improved, and the tool steel roll has good heat cracking resistance and can greatly improve the working efficiency of the medium plate rolling mill. At present, the novel roller is put into the market in 2018.
The abrasion loss of the existing high-strength tool steel roller is only phi 0.3mm after the existing high-strength tool steel roller is rolled for 8000 tons, and various high requirements on the roller at present can be very met. However, the novel roller has short time on the market, and the industry has not formed a high-efficiency grinding processing technology matched with the novel roller. Present grinding process can produce surface defects such as roll chatter marks, striations in the course of working, and the emery wheel produces continuous vibration and abnormal sound in the course of working, has the hidden danger of damaging equipment, and because hardness is higher, the grinding force is not enough, if increase current still can increase the emery wheel risk of bursting, has serious potential safety hazard. In addition, the existing data show that the diameter of the roller is 1mm and the removal time is about 16 hours by using the current grinding process, compared with a high-nickel-chromium roller, the grinding process diameter is 1mm and only about 4 hours, and the grinding process time is increased by four times. Some steel plants also abandon the use of these new rolls because of the long grinding times during the use of these new rolls.
Therefore, a set of grinding process matched with the material of the high-wear-resistant alloy tool steel roller is urgently needed to be developed, the surface quality of the grinding roller is improved, the time is shortened, and the working efficiency is improved.
Disclosure of Invention
In order to solve the problem of prior art, the problem that roll grinding exists among the prior art is solved to this application aim at, provides neotype grinding process, can obviously improve grinding efficiency, and the efficient has reduced the horizontal line of shaking in roll surface simultaneously, and has guaranteed circularity and cylindricity requirement, and roughness reaches more than 3.2.
In order to achieve the above purpose, the application provides a method for grinding a high-strength tool steel roller for a medium plate, which specifically comprises the following steps:
grinding by using a grinding wheel with the model number of 900 × 100 × 304.8-7NQAG-46-F/G-9-B7045M/S, wherein the grinding process comprises coarse grinding, semi-fine grinding and fine grinding, and the specific steps are as follows:
coarse grinding stage
Controlling the linear speed of the grinding wheel at 30-40M/S, the rotating speed of the roller at 25-30 r/min, and the grinding current pressure at 20-54M%;
ii, semi-fine grinding stage
Controlling the linear speed of the grinding wheel at 30-40M/S, the rotating speed of the roller at 20-25 r/min, and the grinding current pressure at 25M% or more;
iii refining stage
The linear speed of the grinding wheel is controlled to be 30-40M/S, the rotating speed of the roller is 30-35 r/min, and the grinding current pressure is less than 20M%.
In one possible embodiment, the grinding current pressure is increased by 2M% for each additional pass of the coarse grinding stage until the grinding current pressure is increased to 54M%.
In a possible embodiment, the grinding current pressure is reduced by 2M% for each additional pass in the semi-finishing stage until the grinding current pressure is reduced to 25M%.
Preferably, finally the grinding current pressure may fluctuate within the range of 25M% ± 2M%.
In a possible embodiment, the refining stage is controlled to be within 5 passes.
In one possible embodiment, if the grinding wheel vibrates, the linear speed of the grinding wheel is reduced by 2M/S until the grinding wheel is stable;
further, the lowest linear speed of the grinding wheel does not exceed 30M/S;
in one possible embodiment of the method according to the invention,
in the coarse grinding stage, the traversing speed of the grinding wheel is 2500mm/min, and the feeding amount is 0.01mm;
in the semi-fine grinding stage, the transverse moving speed of the grinding wheel is 2200mm/min, and the feeding amount is 0.01mm;
in the fine grinding stage, the transverse moving speed of the grinding wheel is 2000mm/min, and the feeding amount is 0mm.
In one possible embodiment of the method according to the invention,
in the coarse grinding stage, the correction value is 0.4%/UM, the speed gain of the Z axis is adjusted to be 0.6, and the continuous feeding amount is 0-0.01 mm;
in the semi-fine grinding stage, the corrected value is 0.5%/UM, the speed gain of the Z axis is adjusted to be 0.5, and the continuous feeding amount is 0-0.01 mm;
in the fine grinding stage, the corrected value is 0.7%/UM, the speed gain of the Z axis is adjusted to be 0.3, and the continuous feeding amount is 0-0.01 mm.
In one possible embodiment, the roll hardness is 79 to 84HSD, the roll body length is 3450mm and the usable diameter range is 870 to 940mm.
In one possible embodiment, the grinding wheel is 7NQAG zirconia alumina with a grit size of 46, the grinding wheel has a diameter of 900mm, a width of 100mm, an installed inside diameter of 304.8mm, and a maximum linear speed of 45M/S.
In one possible embodiment, the grinding takes a total time of 165 to 270min,
further, the coarse grinding process takes 120-180 min;
further, the semi-fine grinding process takes 30-60 min;
further, the refining process takes 15-30 min.
The beneficial effect of this application includes:
this application has improved grinding force and grinding efficiency from two aspects, and has reduced the horizontal chatter marks in roll surface. Firstly, by improving the material and parameters of the grinding wheel and adopting the zirconia corundum grinding wheel, the grinding material is sharper, the hardness is higher, the grinding material can be kept sharp for a longer time, the grinding force of the grinding wheel is higher, and the processing efficiency is obviously improved. By reducing the width of the grinding wheel, the contact surface is reduced, and the vibration of the grinding wheel is reduced while the cutting force is enhanced. The grinding wheel tissue is relatively loose, so that workpiece burning caused by overhigh temperature in the grinding process is avoided, the grinding material gap is larger, and the cutting force is improved while the blockage of abrasive dust is not easily caused; and secondly, the qualified rate of the roller is ensured by optimizing grinding process parameters, and meanwhile, the grinding time is greatly shortened, and the time cost is saved.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. The detection method is not particularly described, and the detection is carried out according to national standards or conventional detection methods.
S1: roll material preparation
The quality of the roller is the basis for ensuring the high and low quality of the rolled product, and the mechanical property and the grinding quality of the roller directly influence the surface quality and the plate shape of the rolled product such as a plate and the working efficiency of a rolling mill. The application provides a grinding process aiming at a high-strength tool steel roll with the hardness of 79-84 HSD, so that the grinding efficiency is obviously improved.
S2: grinding wheel preparation and parameter adjustment
The grinding wheel is selected according to the grinding of the rollers made of different materials, and the grinding materials made of different materials are selected.
The mechanical property of the high-strength roller, the roller grinding requirement and the grinding machine characteristic are comprehensively considered, a parallel grinding wheel of 900X 100X 304.8-7NQAG-46-F/G-9-B7045M/S is adopted, namely 7NQAG zirconium corundum with 46 abrasive grain size is adopted, the diameter of the grinding wheel is 900mm, the width is 100mm, the installation inner diameter is 304.8mm, the structure number is 9, the highest linear speed reaches 45M/S, and the hardness is F/G.
The generation of the grinding transverse vibration lines is to a great extent that the grinding force of the grinding wheel is insufficient in the grinding process, the durability of the grinding wheel keeping sharpness is not long enough, the threshing speed of the grinding wheel is low in the machining process, the tissue density is fine, and therefore grinding scraps blocked on the grinding wheel cannot be well discharged, the phenomena of knife collision, grinding immobility and hard squeezing grinding occur when the grinding wheel and a roller are in contact grinding, and the transverse vibration lines are generated.
This application is specifically through improving the emery wheel material and carrying out parameter adjustment, has improved abrasive machining efficiency, has avoided producing horizontal chatter marks.
The method specifically comprises the following steps:
the width of the grinding wheel is reduced to 100MM, the grinding is sharper by reducing the contact surface between the grinding wheel and the roller, the cutting force is obviously enhanced, the width of the grinding wheel is reduced, and the vibration frequency of the grinding wheel is reduced;
the grinding wheel is made of zirconia alumina, zirconia as raw materials, and the zirconia alumina is smelted in an electric arc furnace at the high temperature of more than 2000 ℃; the 7NQAG zirconium corundum abrasive is sharper, has higher hardness, keeps the abrasive sharp for a long time, has better grinding effect and higher speed;
according to the method, the grain size of the abrasive grains is increased to 46, the cutting force of the coarse grain size is stronger, the hardness is in an F/G grade, the material is softer, and the sharpness of the abrasive wheel can be kept for a long time; meanwhile, the grinding wheel tissue is relatively loose, so that workpiece burning caused by overhigh temperature in the grinding process is avoided, the grinding material gap is larger, the cutting force is improved, meanwhile, the blockage of grinding chips is not easy to cause, and the generation of vibration lines is reduced.
S3: grinding process
The grinding method comprises coarse grinding, semi-fine grinding and fine grinding, and specifically comprises the following steps:
coarse grinding stage
Controlling the linear speed of the grinding wheel to be 30-40M/S;
the linear speed of the grinding wheel directly influences the speed of the grinding efficiency, however, the speed of the grinding wheel is too high, when the grinding speed is increased, the grinding wheel continuously generates vibration and abnormal sound, vibration lines appear on the surface of a roller, great potential safety hazards exist in long-time grinding operation, the potential safety hazards of equipment damage also exist, and great economic loss is easily caused. And the linear speed of the grinding wheel is set to be too small, so that the corresponding grinding efficiency is reduced, and particularly for the high-strength tool steel roll material, the grinding time is longer, and the operation efficiency, time and economic cost of enterprises are seriously influenced. In the coarse grinding stage, the linear speed of the grinding wheel is controlled to be 30-40M/S, so that the grinding efficiency is ensured, and the surface quality such as vibration marks and the like and various potential safety hazards are avoided.
In the case of abnormal sound generated by the grinding wheel, the grinding wheel linear speed is reduced by 2M/S until the grinding wheel is finally smooth, and the grinding wheel linear speed is not more than 30M/S at the lowest, such as 40M/S, 38M/S, 36M/S, 34M/S, 32M/S and 30M/S.
The noise abnormal condition of the grinding wheel can be avoided by correspondingly adjusting the linear velocity of the grinding wheel to be in a frequency range which does not correspond to the grinding machine on the basis of ensuring that the grinding wheel is properly installed and properly used if the abnormal sound of the grinding wheel is generated. The linear velocity of the grinding wheel is controlled within 40M/S, so that under the condition of not generating vibration or abnormal sound, the stay time of the grinding material of the grinding wheel in contact with the roller can be prolonged, better threshing can be realized, and the sharpness of the grinding wheel can be kept.
The grinding current pressure is 20M% -54M%;
preferably, the grinding current pressure is increased by 2M% for each additional machining pass until the grinding current reaches 54M%, for example: 20M%, 22M%, 24M%, 26M%, 28M%, 30M%, 32M%, 34M%, 36M%, 38M%, 40M%, 42M%, 44M%, 46M%, 48M%, 50M%, 52M%, 54M%.
The degree of grinding is closely related to the feed amount, the continuous feed amount, and the grinding current. The traditional grinding machine can only control the grinding amount through the feeding amount and the continuous feeding amount, but the grinding amount is difficult to adjust through grinding current; in order to achieve the purpose of better adjusting the grinding amount, the grinding machine technology which mainly adjusts the grinding current and assists the feeding amount and the continuous feeding amount is preferred in the application.
Furthermore, according to the material and hardness of the conventional grinding roller, after the grinding current value exceeds 54M%, the probability of generating vibration lines is increased, and the low grinding current value causes low processing efficiency, so that the high grinding current pressure is ensured as far as possible on the basis of ensuring that the grinding time is prolonged without generating vibration lines.
The transverse moving speed of the grinding wheel is 2500mm/min, the transverse moving speed of the grinding wheel is slow overall, the damping effect is achieved, and meanwhile the form and position tolerance precision is improved.
The rotating speed of the roller is 25-30 r/min;
in practical application, the higher the rotating speed of the roller is, the larger the cutting force is, the higher the processing efficiency is, the better the shape is kept, but vibration is easily generated in the grinding process, a vibration period can be formed after vibration lines are generated, along with the time lapse without manual intervention, the fall of the wave crest and the wave trough of the vibration lines can reach 1mm, a large amount of time needs to be consumed for grinding the margin of 1mm, and the processing speed in the prior art at least needs 4 hours. Therefore, in the rough grinding stage, it is also necessary to maintain the accuracy and the shape and position of the roll surface so as not to increase unnecessary processing time for the subsequent processes, while ensuring the processing efficiency.
The feeding amount is 0.01mm, the continuous feeding amount is 0-0.01 mm, the correction value is 0.4%/UM, and the Z-axis speed gain is adjusted to be 0.6; the process further increases the grinding rate and the processing time is faster.
The coarse grinding stage takes 120-180 min.
Ii, semi-refining stage
Controlling the linear speed of the grinding wheel to be 30-40M/S; such as 30M/S, 31M/S, 32M/S, 33M/S, 34M/S, 35M/S, 36M/S, 37M/S, 38M/S, 39M/S, 40M/S. In the semi-fine grinding stage, the processing core is transited from a rough processing surface to a smooth processing surface, and in the stage, the linear speed of the grinding wheel is controlled to be 30-40M/S without too much processing efficiency, so that the precision of the roller can be better corrected.
And under the condition that the grinding wheel generates abnormal sound, the linear speed of the grinding wheel is reduced by 2M/S until the grinding wheel is finally stable, and the lowest linear speed of the grinding wheel does not exceed 30M/S.
The grinding current pressure is reduced by 2M% for every more processing pass until the grinding current pressure reaches 25M%. Because the novel roller is high in hardness and high in wear resistance, the quality of the roller surface cannot be guaranteed when the reduction rate of the grinding current and the pressure is too high.
Preferably, the final grinding current pressure may fluctuate within a range of 25M% ± 2M%. For example, it may be 23M%, 24M%, 25M%, 26M%, 27M%.
The rotating speed of the roller is 20-25 r/min, and vibration reduction is further realized by reducing the rotating speed of the roller, so that the generation of vibration lines is reduced.
The transverse moving speed of the grinding wheel is 2200mm/min, the feeding amount is 0.01mm, the continuous feeding amount is 0-0.01 mm, the corrected value is 0.5%/UM, and the speed gain of the Z axis is 0.5.
The semi-fine grinding stage takes 30-60 min by measurement.
Iii refining stage
The linear speed of the grinding wheel is controlled to be 30-40M/S. Such as 30M/S, 31M/S, 32M/S, 33M/S, 34M/S, 35M/S, 36M/S, 37M/S, 38M/S, 39M/S, 40M/S.
And under the condition that the grinding wheel generates abnormal sound, the linear speed of the grinding wheel is reduced by 2M/S until the grinding wheel is finally stable, and the minimum linear speed of the grinding wheel does not exceed 30M/S.
The grinding current pressure is less than 20M%. Such as 19M%, 18M%, 17M%, 16M%, 15M%, 14M%.
Preferably, the number of passes is controlled within 5.
The rotating speed of the roller is 30-35 r/min.
The transverse moving speed of the grinding wheel is 2000mm/min, the feeding amount is 0mm, the continuous feeding amount is 0-0.01 mm, and the corrected value is 0.7%/UM.
Through determination, the fine grinding stage takes 15-30 min.
The grinding process takes 165-270 min in total.
Compared with the grinding process in the prior art, the diameter of the high-strength tool steel roll for processing the medium plate by using the novel processing process is 1MM, and the grinding speed is increased by nearly 4 times.
S4: roller Performance measurement
Through determination, after the high-strength tool steel roller is ground by adopting the process, the roundness of the roller reaches phi 0.03mm, the cylindricity reaches phi 0.03mm, the roughness reaches more than 3.2, and the qualified rate of the roller is high.
Example 1
The grinding wheel model of the embodiment adopts 900 × 100 × 304.8-7NQAG-46-F/G-9-B7045M/S, the roller is made of high-strength tool steel, the hardness of the roller is 79-84 HSD, and the grinding process comprises the following steps:
coarse grinding stage
Controlling the linear speed of the grinding wheel at 40M/S and the rotating speed of the roller at 30r/min; the grinding current pressure is set to be 20M%, and the grinding current is increased by 2M% in each 1 processing pass until the grinding current reaches 54M%; the transverse moving speed of the grinding wheel is 2500mm/min, the feeding amount is 0.01mm, the continuous feeding amount is 0.01mm, the correction value is 0.4%/UM, the speed gain of the Z axis is adjusted to be 0.6, and the coarse grinding time is 160min;
ii, semi-fine grinding stage
Controlling the linear speed of the grinding wheel at 35M/S and the rotating speed of the roller at 20r/min; the grinding current pressure is reduced by 2M% every 1 processing pass until the grinding current reaches 25M%; the transverse moving speed of the grinding wheel is 2200mm/min, the feeding amount is 0.01mm, the continuous feeding amount is 0.01mm, the corrected value is 0.5%/UM, the speed gain of the Z axis is adjusted to be 0.5, and the time is consumed for 50min;
iii refining stage
Controlling the linear speed of a grinding wheel at 40M/S, and controlling the rotating speed of the roller at 30r/min; the grinding current pressure is 18M%, and the processing pass is controlled to be 5 times; the transverse moving speed of the grinding wheel is 2000mm/min, the feeding amount is 0mm, the continuous feeding amount is 0.01mm, the correction value is 0.7%/UM, the speed gain of the Z axis is adjusted to be 0.3, and the time is 15min.
Example 2
The grinding wheel model of the embodiment adopts 900 × 100 × 304.8-7NQAG-46-F/G-9-B7045M/S, the roller is made of high-strength tool steel, the hardness of the roller is 79-84 HSD, and the grinding process comprises the following steps:
coarse grinding stage
Controlling the linear speed of the grinding wheel at 35M/S and the rotating speed of the roller at 25r/min; the grinding current pressure is set to be 20M%, and 2M% is increased for each 1 processing pass until the grinding current reaches 54M%; the transverse moving speed of the grinding wheel is 2500mm/min, the feeding amount is 0.01mm, the continuous feeding amount is 0.01mm, the corrected value is 0.4%/UM, the speed gain of the Z axis is adjusted to be 0.6, and the time is 180min;
ii, semi-fine grinding stage
Controlling the linear speed of the grinding wheel at 30M/S and the rotating speed of the roller at 25r/min; the grinding current pressure is reduced by 2M% every 1 processing pass until the grinding current reaches 25M%; the transverse moving speed of the grinding wheel is 2200mm/min, the feeding amount is 0.01mm, the continuous feeding amount is 0.01mm, the correction value is 0.5%/UM, the speed gain of the Z axis is adjusted to 0.5, and the time is 60min;
iii refining stage
Controlling the linear speed of a grinding wheel at 35M/S, and controlling the rotating speed of the roller at 35r/min; the grinding current pressure is 18M%, and the processing pass is controlled to be 5 times; the transverse moving speed of the grinding wheel is 2000mm/min, the feeding amount is 0mm, the continuous feeding amount is 0.01mm, the corrected value is 0.7%/UM, the speed gain of the Z axis is adjusted to be 0.3, and the time is 15min.
Example 3
The grinding wheel model of the embodiment adopts 900 × 100 × 304.8-7NQAG-46-F/G-9-B7045M/S, the roller is made of high-strength tool steel, the hardness of the roller is 79-84 HSD, and the grinding process comprises the following steps:
coarse grinding stage
Controlling the linear speed of the grinding wheel at 30M/S and the rotating speed of the roller at 25r/min; the grinding current pressure is set to be 20M%, and the grinding current is increased by 2M% in each 1 processing pass until the grinding current reaches 54M%; the transverse moving speed of the grinding wheel is 2500mm/min, the feeding amount is 0.01mm, the continuous feeding amount is 0.01mm, the correction value is 0.4%/UM, the speed gain of the Z axis is adjusted to be 0.6, and the time is 170min;
ii, semi-refining stage
Controlling the linear speed of the grinding wheel at 40M/S and the rotating speed of the roller at 20r/min; the grinding current pressure is reduced by 2M% every 1 processing pass until the grinding current reaches 25M%; the transverse moving speed of the grinding wheel is 2200mm/min, the feeding amount is 0.01mm, the continuous feeding amount is 0-0.01 mm, the corrected value is 0.5%/UM, the Z-axis speed gain is adjusted to 0.5, and the time is consumed for 50min;
iii refining stage
Controlling the linear speed of the grinding wheel at 30M/S, and controlling the rotating speed of the roller at 30r/min; the grinding current pressure is 18M%, and the processing pass is controlled to be 5 times; the transverse moving speed of the grinding wheel is 2000mm/min, the feeding amount is 0mm, the continuous feeding amount is 0.01mm, the corrected value is 0.7%/UM, the speed gain of the Z axis is adjusted to be 0.3, and the time is 15min.
In conclusion, the grinding method of the high-strength tool steel roller for the medium plate can obviously improve the grinding efficiency, efficiently reduce the transverse vibration lines on the surface of the roller, ensure the requirements on roundness and cylindricity, ensure the roughness to be more than 3.2, greatly shorten the grinding time and save the time cost.
The foregoing is illustrative of the present application and is not to be construed as limiting thereof, as numerous modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (5)
1. A grinding method of a high-strength tool steel roller for medium plates comprises coarse grinding, semi-fine grinding and fine grinding, and is characterized in that,
in the coarse grinding stage, the linear speed of a grinding wheel is controlled to be 30 to 36M/S, the rotating speed of a roller is 25 to 30r/min, the grinding current pressure is controlled to be 20 to 54M%, the transverse moving speed of the grinding wheel is 2500mm/min, the feeding amount is 0.01mm, the corrected value is 0.4 percent/UM, the Z-axis speed gain is adjusted to be 0.6, the continuous feeding amount is 0 to 0.01mm, and the grinding current pressure is increased by 2M% until the grinding current pressure is increased to 54M% when each processing pass is added in the coarse grinding stage;
in the semi-fine grinding stage, the linear speed of the grinding wheel is controlled to be 30 to 36M/S, the rotating speed of the roller is 20 to 25r/min, the grinding current pressure is more than or equal to 25M%, the transverse moving speed of the grinding wheel is 2200mm/min, the feeding amount is 0.01mm, the corrected value is 0.5%/UM, the Z-axis speed gain is adjusted to be 0.5, the continuous feeding amount is 0 to 0.01mm, and the grinding current pressure is reduced by 2M% until the grinding current pressure is reduced to 25M when each machining pass is added in the semi-fine grinding stage;
in the fine grinding stage, the linear speed of the grinding wheel is controlled to be 30 to 38M/S, the rotating speed of the roller is 30 to 35r/min, the grinding current pressure is less than 20M%, the transverse moving speed of the grinding wheel is 2000mm/min, the feeding amount is 0mm, the corrected value is 0.7%/UM, the gain of the Z-axis speed is adjusted to be 0.3, and the continuous feeding amount is 0 to 0.01mm;
in the grinding process, if the grinding wheel vibrates, the linear speed of the grinding wheel is reduced by 2M/S until the grinding wheel is stable;
the grinding wheel is a 900 x 100 x 304.8-7NQAG-46-F/G-9-B7045M/S grinding wheel, in particular to a parallel grinding wheel which has the diameter of 900mm, the width of 100mm, the diameter of an installation inner hole of 304.8mm, the material of zirconium corundum, the granularity of 46 and the hardness of medium-soft grade F/G, the structure number of 9 grades, the type of 70 resin adhesive and the highest linear speed of 45M/S.
2. A method according to claim 1, characterised in that the grinding current pressure can finally fluctuate within the range 25% ± 2M% in the semi-refining stage.
3. A method according to claim 1, characterized in that in the refining stage, the number of passes is controlled to be within 5.
4. The method as claimed in claim 1, wherein the total grinding time is 165 to 270min; the coarse grinding process takes 120 to 180min, the semi-fine grinding process takes 30 to 60min, and the fine grinding process takes 15 to 30min.
5. The method according to claim 1, wherein the roll hardness is 79 to 84HSD, the roll body length is 3450mm, and the usable diameter is 870 to 940mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110667434.7A CN113305649B (en) | 2021-06-17 | 2021-06-17 | Grinding method of high-strength tool steel roller for medium plate |
Applications Claiming Priority (1)
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