摘要:
The invention relates to a method for controlling a rolling process, in which a metal strip is rolled flat by use of at least one roller. It is known from the prior art that the relative position of a neutral point represents a measure of the instantaneous stability of a rolling process. However, traditional methods for calculating the position of the neutral point do not accurately represent the actual properties of metal and therefore have only limited usefulness for predicting the stability of a rolling process. In order to allow better control of a rolling process for rolling a metal strip with regard to the actual behavior of the metal strip, the invention proposes a new method for calculating the relative position of the neutral point, in which in particular the flat yield stress ke and the hydrostatic pressure pNH at the neutral point are incorporated.
摘要:
A sheet metal element in the form of a semi-finished product is produced by joining at least one part consisting of flexibly rolled sheet metal whose sheet thickness is variable along the rolling direction and at least one part consisting of a rolled sheet metal with a constant sheet thickness.
摘要:
In a process for presetting the adjusting-member positions of a roll stand upon the rolling of a new coil or for the next pass in each case during cold rolling of bands, adjusting-member positions for the band flatness are used that are based on the corresponding actual data of the first pass of a reference coil, whose reference data results in the best correspondence with the target data of the new coil, or on the actual data of the preceding pass. At the same time, the band thickness can be preset by the specification of a rolling force or adjustment position adapted over a certain time period from the actual data of reference conditions of the roll stand or the rolling mill train.
摘要:
This invention provides a continuous hot rolling process for making thin strip in which it is possible to roll strips at high rolling speeds required to keep a finisher delivery temperature equal to or higher than an Ar.sub.3 transformation temperature. The gist of the present invention resides in a continuous hot rolling process in which the rolling speed of a final finishing mill is kept constant or slightly increased until the leading end of rolled strip travels from the final finishing mill to a down coiler which process comprises: rolling a predetermined length of the leading end portion of a stock being rolled in accordance with a strip thickness greater than a finished thickness; then reducing the strip thickness to the finished thickness by gauge alteration in rolling; and subsequently rolling the following portion.
摘要:
A method and apparatus for rolling a taper in or out of a strip during reduction by a rolling mill, rolling a first portion of the strip by employment of a gaugemeter roll gap control system using a first value for the mill stretch above the natural mill stretch value for the mill and which value during the rolling of the first portion will be a fixed value, thereafter rolling a second portion of the strip in the same rolling operation by using a value for the mill stretch in the gaugemeter roll gap control system which will vary to effect a change in the roll gap and hence a change in reduction of the strip in which the second value may be a linear function.
摘要:
A method for hot rolling a continuously cast thin slab to form strip comprising the steps of: (a) subjecting a segment of predetermined length of the slab to a reduction pass in a first direction between a pair of work rolls; (b) retracting the segment in a direction opposite the first direction to the entrance side of the work rolls while accommodating the additional length of the segment produced by the reduction operation; (c) repeating steps (a) and (b) in sequence as necessary to finish the segment; and (d) consecutively subjecting the next contiguous portion of the slab to steps (a), (b) and (c) until the slab is finished along its entire length. Apparatus for practicing the method also is disclosed.
摘要:
The invention provides a method for controlling a continuous rolling mill having at least ith and (i+1)th stands and a control apparatus therefor, wherein an exit strip thickness reference value of an automatic gauge control is changed in accordance with a predetermined strip length during size changing and roll gap is corrected so as to change a strip thickness at an exit side of the ith stand, when a size (e.g., thickness) is changed during rolling, and, at the same time, a roll peripheral speed of the ith stand is changed in correspondence with a change in forward slip (a change in entry strip thickness, a change in exit strip thickness, and a change in resistance to deformation) of the ith stand as well as changes in forward slip, exit strip thickness, entry strip thickness and roll peripheral speed of the (i+1)th stand, so as to make the strip speed at the exit side of the ith stand coincide with that at the entry side of the (i+1)th stand, thereby minimizing the interstand tension and performing smooth size changing.
摘要:
A method of forming a taper leaf for use in a laminated spring wherein pre-tapering work is first performed by which a terminal portion of a sheet of spring material is transformed in its lateral direction so as to become thinner toward the tip while maintaining the vertical thickness of the sheet or section at the original thickness of the material. Subsequently, the same portion is rolled for tapering in a vertical direction.
摘要:
A process of manufacturing a taper leaf spring by which rollers for measuring the length and the thickness are respectively disposed on the take-out side of a material plate for a taper leaf spring relative to a pair of rolling rollers, and also rollers for measuring the breadth are disposed on the same take-out side; rolling for regulating the breadth is beforehand performed by a pair of edge rollers on the take-in side of the material plate relative to the pair of rolling rollers; the distance of the interval between both rolling rollers is adjusted by comparing signals coming from the rollers for measuring the length and the thickness with the standard signals based on the predetermined specifications of the length and the thickness; the regulation of the breadth by means of the pair of edge rollers is controlled by comparing the signal from the breadth measuring rollers with the standard signal based on the predetermined specification; so that the material plate is rolled to a taper as desired.
摘要:
This invention relates to a method of controlling the wall thickness of tubes. A special depressing mechanism is provided on the specific stands of a tube elongater in a step prior to a reducing mill so that, by the opening and tightening control of this mechanism, the reduction of the yield by the phenomenon of the ends thickening of a tube in the reducing mill may be prevented. The response to the depression may be quick and thus the efficiency of the production may be remarkably improved.