摘要:
A re-turning plant for rollers of rolling mills of the type comprising at least one roller stand and a plurality of rollers mounted to respective arms pivoting in the plane of the roller stand about respective pins that are fixed to the roller stand. The rollers are positioned within the roller stand in a work position in which work surfaces of the rollers determine the outer profile of a body to be rolled. The re-turning plant comprises a support structure configured to support the whole roller stand in a turning position, a tool-holding device that can be displaced in contact with the work surfaces of each roller fixed in the roller stand and mandrel means with means that can be rotatably coupled to each roller of the plurality of rollers fixed to the roller stand to rotate the same substantially in the work position.
摘要:
A dual roll grinder employs a first and second work station including a dual drive headstock disposed therebetween. A grinding assembly and the dual drive headstock translatably move along a bed to engage rolls in either of the two stations. This permits unloading and loading of a new roll in the station not currently active.
摘要:
A grinder capable of disassembling a pair of rolls of a rolling mill each having a pair of bearing assemblies on its opposite ends, separately grinding and reconditioning the disassembled rolls, and reassembling the reconditioned rolls. Included are a pair of opposed wheel stocks each having an abrasive wheel and both movable linearly along respective wheel guideways extending parallel to each other. Two pairs of opposed pivotal work carriers are disposed intermediate the pair of wheel guideways, with each pair of work carriers spaced from each other in a direction parallel to the wheel guideways. Each pair of work carriers are jointly movable between a common centerline position midway between the pair of wheel guideways, and a grinding position adjacent one of the wheel guideways. A set of fluid actuated work lifters are disposed adjacent the centerline position for loading the disassembled rolls on the respective pairs of work carriers, and for unloading the ground rolls therefrom, as the pairs of work carriers are successively moved to the common centerline position. Loaded on the respective pairs of work carriers, the rolls are ground in the grinding positions by being held against the abrasive rolls as the work carriers are pivoted and held in a slanting attitude. A pair of headstocks are provided for revolving the rolls being held against the abrasive wheels.
摘要:
In the rolling of wire or rod in a rolling line having a roughing or intermediate block whose rolling stands have non-adjustable rolls except for those at the exit end of the block, the rolls of the non-adjustable stands can be re-used at least once in the same stand location after being re-conditioned by reconditioning all the rolls defining a first series of sizing passes so as to form a second series of sizing passes whose individual sizes are larger than those of the first series. The change in dimensions of a given sizing pass as a result of reconditioning is less than the difference between the dimensions of that sizing pass after reconditioning (i.e. of the second series ) and the dimensions of the immediately preceding sizing pass before reconditioning (i.e. of the first series). Thus, after a second or subsequent reconditioning the rolls of a given stand are transferred to the immediately preceding stand for re-use to define the first series of sizing passes.In this way, the amount of roll material removed at each reconditioning operation is reduced.
摘要:
An apparatus for supporting the journal of a mill roll in a journal box carrying a bearing assembly in which the journal is disposed. The bearing assembly comprises a hydrostatic bearing interacting with a bearing sleeve which perform the dual function of retaining an arrangement of roller bearings during mill operation, and provide radial support for the roll during a resurfacing operation.
摘要:
Rolling mill rolls, such as the final rolls for a sheet cold rolling operation, are machined by electrical discharges in a lathe-type machine with a roll length electrode tool. High areas of the roll shape the adjacent surface of the electrode tool, either by a mechanical or electrical wear-in operation, so that such surface substantially complements the desired final roll contour. The shaped electrode tool is subsequently used for electrical discharge machining (EDM) the roll to the level of the lowest roll portions so as to impart a very uniform matte texture to the roll surface and provide a roll with substantially perfect cross-sectional circularily. If the machining is carried out with a segmented electrode tool, the tool is preferably moved slightly from time-to-time axially of the roll during at least the final stages of the machining process. Following the machining, the roll may be used without further processing as an improved substitute for rolls textured by the conventional shot blasting technique or it may be ground to a bright polish.
摘要:
The invention relates to a method for the production or restoration of working rolls for hot rolling metallic flat products, in particular for shaping steel slabs to pre-strips on broad strip mills, wherein the improvement resides in that the central circumferential zone of the roll body is provided with a greater coarseness than the two marginal zones. With this process it is possible to employ rolls with great hardness and yet obtain an excellent roll bite, so that the efficiency is greatly enhanced.
摘要:
A new and improved brush assembly for cleaning a cylindrical surface, the improvement being in the planetary system which includes in combination a chain and a large stationary sprocket mechanism attached to the body of the cleaning machine, the said chain extending over the large sprocket and a second smaller sprocket, the second sprocket in the planetary system being the power transmitting means to a system of cleaning brushes for cleaning cylindrical surfaces.