Abrading – Precision device or process - or with condition responsive... – Computer controlled
Patent
1997-08-26
1999-07-20
Eley, Timothy V.
Abrading
Precision device or process - or with condition responsive...
Computer controlled
451 8, 451 11, 451 49, 451 57, 451 65, 451130, 451150, 451213, B24B 4902, B24B 100, B24B 712
Patent
active
059249110
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an arrangement and a method for grinding articles such as billets, blooms and slabs which are moved in a certain direction on a support.
PRIOR ART
Grinding of different articles is a very ancient treatment method and an indefinitely great number of means for the performance of such methods have been constructed. The grinding is performed to give an article, for example, an accurate dimension, an attractive surface, a specially-shaped surface, a surface with grooves, etc. A certain grinding method is known for grinding steel billets, blooms or slabs which, after grinding, shall be milled out to plates or the like. To achieve a successful milling it is necessary that the surface of the billet, bloom or slab which is introduced into the mill is free from impurities, scratches and the like. Special plants for such billet grinding have been constructed. They are often connected to a moulding plant for continuous moulding of billets which, in a warm condition, are introduced into the grinding arrangement. Also grinding of cool billets may occur.
In the known billet grinding plants the billet to be ground is moved forwards and backwards on a support while the rotating grinding wheel, which is arranged on the end of an arm, is given a stationary position. When the billet has been ground forward to one end, the grinding wheel is moved relative to the billet and the billet is ground along a new grinding track adjacent to the earlier grinding track by moving the billet in an opposite direction. Two or more grinding tracks adjacent to each other are accordingly made. Due to the fact that the grinding wheel rotates in a plane perpendicular to the movement direction of the billet and that it is cylinder-shaped on its surface, the adjacent grinding tracks will then be somewhat arc-formed. This can be changed by bringing the grinding wheel to rotate in a plane which has an angle of 45.degree. in relation to the forward direction of the billet at the last grinding.
Billets which are rectangular or square in section are advantageously ground on two opposite sides. Preferably, two grinders are then used and a turning device is then used between the two grinders.
Methods and arrangements for grinding the billets crosswise are also known. Such a method and arrangement are described in, for example, the European patent 0 053 274, which method includes moving the grinding disc across the forwardly moving billet at such an angle compared to the billet that the ground area will have an angle of 90.degree. compared to the longitudinal direction of the billet. In such an arrangement the grinding wheel must be swingable so that it is moved forward at an angle compared to the billet when it is moved forward different than the angle when it is moved backwards. The billet will also receive a grinding of low quality since the grinding traces will be oblique.
Another method and another arrangement are described in the German patent 3 037 571 wherein the billet is ground on both the underside and the upper side. The grinding wheels are in this case stationary with the exception that they can be moved forwards and backwards across the billet.
A further arrangement for grinding billets is described in the British patent 2 223 432, which arrangement comprises a grinding wheel which goes across the billet. In such a case it is important that the billet does not move quicker than the width of the grinding wheel. If it does, the whole surface will not be ground.
TECHNICAL PROBLEM
Although grinding of billets, blooms and slabs with the known technique and the known machines may give satisfying results, the grinding will be discontinuous and complicated as the billet has to be moved forward and backward a number of times so that the whole surface shall be ground. Moreover, an arc-shaped surface is obtained by grinding more parallel tracks, which surface must be made even in a last step by using in this step a grinding wheel which is arranged at an angle of 45.degree. to the forward direction
REFERENCES:
patent: 2907151 (1959-10-01), Peterson
patent: 3503161 (1970-03-01), Long
patent: 4461124 (1984-07-01), Anderson
patent: 4837984 (1989-06-01), David
patent: 5276999 (1994-01-01), Bando
patent: 5361544 (1994-11-01), Yang
Danieli Centro Maskin SpA
Eley Timothy V.
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