Abrading – Precision device or process - or with condition responsive... – With indicating
Patent
1992-11-23
1994-12-13
Lavinder, Jack W.
Abrading
Precision device or process - or with condition responsive...
With indicating
451 6, 451 26, 451 7, 451 49, 451 53, B24B 504, B24B 537, B24B 4904, B24B 4914
Patent
active
053719751
DESCRIPTION:
BRIEF SUMMARY
This invention is related to a process for machining rolls and similar work pieces, especially for grinding the roll surface to desired shape and radius.
It is previously known that in a machining process, such as grinding rolls for which small size tolerances are required, such as rolls used in the paper, plastics and metal industries, temperature variations in the roll influence the grinding and measuring result, and attempts have been made to take into account the roll temperature when grinding the roll. Such previous attempts have, however, had deficiencies, e.g. in that temperature variations created during the working have not been taken into account.
According to this invention it is possible to substantially improve the accuracy and shorten the working time for machine working, such as turning and especially grinding rolls and similar work pieces, by measuring during the working continuously (including also intermittently with small time intervals) the actual size of the work piece close to or preferably at the part of the surface of the work piece where the tool, especially a grinding wheel, contacts the surface of the work piece, in the case of a rotating work piece especially at an area in the same radial plane or within a short axial distance from said plane, e.g. at most 100 mm or at most 10 mm, and also measuring the temperature of the work piece, preferably at or close to those areas where machining and/or measuring the size or distance is performed, with a rotating work piece preferably at an area in the same radial plane or within a short axial distance therefrom, e.g. at most 100 mm or at most 10 mm. From the distance measuring means and temperature measuring means resp. which are used signals corresponding to the measured values are transferred to a calculating unit which is arranged to calculate and preferably present, on the basis of said measured values and other relevant information, e.g. the coefficient of thermal expansion, heat conductivity, heat capacity, etc. of the work piece, which depend on the material, especially roll material, at least one measured value which makes it possible to compare the desired size value of the location being worked with the actual size value thereof taking into consideration the actual temperature during the machining and the distance measuring. Said desired and actual values are suitably recalculated to a common temperature, especially to the measured temperature, but as an alternative to any other suitable temperature, e.g. the temperature at which the roll is intended to be used. This may e.g. be the temperature (temperature zone) in a part of a paper machine in which a roll, which is subjected to machining, is intended to be used, e.g. the temperature at which a wire roll is used. It may, furthermore, generally be suitable or necessary to take into consideration whether various parts of the work piece, e.g. a roll, exhibit different temperatures in use, in which case the desired size values, in case the work piece has another temperature distribution than that which is prevailing in use, should be calculated with corrections made for said differences of the temperature of use.
It is e.g. possible to calculate and preferably also present at least one of, suitably two of and preferably all three of the following values: The desired size value of the work piece corrected to the actual temperature, i.e. the shape of the work piece which is desired, corrected for the actual (prevailing) temperature, the actual (optionally temperature corrected) size value of the work piece and the depth of machining remaining to the desired value.
Preferably two of or all three of said values are presented, e.g. on a display unit as graphs in a coordinate system, whereby preferably also the actual position of the tool in the axial direction is disclosed with a marker on the display unit. Presentation is preferably performed with a suitable scale ratio in the radial/axial direction, e.g. a ratio of at least 500:1, depending, of course, on the size of the difference b
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Derwent's Abstract No. 83-769 359/38, SU 973 325, Bul. 42, Nov. 15, 1982, "Grinding Temp. Controller-has IR Radiation Receiver Mounted in Radial Channel of Grindstone Hub".
Yutaka Yamauchi 59-209759, Appl. No. 58-82332, "Size Control Method in Cutting", vol. 9, No. 80, May 10, 1983.
Hideyo Iwata, 60-1184568, Appl. No. 58-227623, "Automatic Dimension Correcting Method for Thermal Displacement of Grinder", vol. 9, No. 275, Nov. 30, 1983.
E. Lundmark Industrimatningar
Lavinder Jack W.
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