摘要:
A method of supplying lubricating oil in cold-rolling by emulsion lubrication, characterized by comprising: using a constant (supply efficiency) obtained under conditions of a specific rolling rate, emulsion supply, emulsion concentration, emulsion temperature, plateout length, rolled material width or roll barrel length, rolling load, grade of the rolled material, and type of lubricating oil and oil film thickness at the time of neat lubrication realized under the specific rolling lubrication conditions to estimate the oil film thickness realized by emulsion lubrication under the specific rolling lubrication conditions and controlling at least one of the emulsion supply, emulsion concentration, emulsion temperature, and plateout length so that the estimated oil film thickness matches with the target oil film thickness.
摘要:
An installation for cold-rolling strip composed of special steel and/or nonferrous metals, which includes a multi-stand tandem rolling mill and essentially two independent coolant and lubricant systems. The installation further includes an emulsion system with tanks, system pumps, coolers, and vacuum band filters and/or pressure band filters as well as a rolling oil system which contains the afore-mentioned components, such that the filters are extremely fine, reversible-flow filters.
摘要:
The invention relates to a method for specifically adjusting the surface structure of rolling stock (3) during cold rolling in skin pass mills. The aim of the invention is to partially transfer the surface structure of the working roll (2) onto the rolling stock (3). To this end, the change of roughness of the rolling stock (3) in the rolling process of a single- or multiple-stand, preferably two-stand skin pass mill is calculated in an optimization calculation in which the rolling parameters are varied according to the mill capacity using a tribological model that mathematically describes the friction conditions in the roll gap (1). The results obtained are then used to readjust at least a part of the rolling parameters used for calculation.
摘要:
The installation includes an in-line arrangement of a metal pickler, a reeling arrangement installed on the coiling side of the metal pickler, and a cold-rolling mill. The method includes ones of the following alternative sequences of work steps: (a) the strip leaving the metal pickler bypasses the reeling arrangement and is introduced into the cold-rolling mill for a first reduction pass and rolled out over the course of several deformation passes; or (b) the strip leaving the metal pickler is wound on the reeling arrangement into a coil; after the coil is switched to the uncoiling position, the strip is fed into the cold-rolling mill and rolled out over the course of several deformation passes; or (c) the strip leaving the metal pickler is wound as hot-rolled strip on the reeling arrangement to obtain the finished strip; or (d) pre-pickled, hot-rolled strips are sent to the reeling arrangement and then uncoiled from the uncoiler into the cold-rolling mill and rolled in several deformation passes.
摘要:
A new configuration and operating method therefore improves conventional continuous pickling and cold-rolling systems in response to increasing demands for high-propertied steel plates. The continuous pickling and cold-rolling equipment system comprises a uncoiling apparatus, a joining apparatus, an accumulating looper, a cleaning section, a pickling section, a cold rolling mill, a cutting apparatus, and a coiling apparatus. This configuration and associated operation method realize a rolling line having a substantially infinite number of mill stands enabling continuous or endless cold rolling without additional mill stands. Thereby, production of cold rolled steel strip with a large total reduction ratio for high-grade steel strips effectively using a small number of mill stands becomes practicable. At least one of the embodiments clearly shows acceptable productivity that can stand comparison with a typical conventional cold rolling system.
摘要:
The invention relates to a method for rolling a metal band in a continuous line installation with coupling of the pickling and cold rolling processes. According to the invention, the composition of the pickling fluid is determined to allow the running of the band in the bath at a minimum speed of a few metres per minute, and similar running speeds are maintained in the pickling and rolling sections, during the operating phases, whereas the rolling conditions are determined in order to maintain the requested quality of the band at a minimum rolling speed that may be as low as 1 metre per minute.
摘要:
The invention relates to a method for rolling a metal band in a continuous line installation with coupling of the pickling and cold rolling processes. According to the invention, the composition of the pickling fluid is determined to allow the running of the band in the bath at a minimum speed of a few meters per minute, and similar running speeds are maintained in the pickling and rolling sections, during the operating phases, whereas the rolling conditions are determined in order to maintain the requested quality of the band at a minimum rolling speed that may be as low as 1 meter per minute.
摘要:
A process for manufacturing a metal foil by effecting rolling with a high efficiency without making any defectively shaped product. A metal foil having a thickness of 0.2 mm or less is manufactured after a plurality of passes of cold rolling by using soft work rolls from the first pass to the pass preceding the kissing pass during which the kissing of rolls is likely to occur, using hard work rolls for carrying out the kissing pass with a reduction in thickness of over 30%, and using soft work rolls for carrying out the last, or the last two passes with a reduction of 20% or less. Judgment is made again as to the likelihood of any roll kissing when hard rolls are used, and the pressure to be applied for the kissing pass is controlled in accordance with the result of such judgment.
摘要:
This invention relates to a process for producing a cold rolled, recrystallation annealed, stainless steel strip having lustrous surfaces without being hot band annealed and/or pickled prior to cold reduction. The process includes the sequential steps of tension leveling to crack the scale and flatten a hot processed metal strip, shot blasting the strip to ablatively remove the scale and to provide a surface roughness less than 3.6 micron Ra using at least two pairs of wire brushes positioned adjacent to both surfaces of the strip with these cleaning brushes being rotated in opposite directions relative to each other to mechanically remove any residual scale. The mechanically cleaned strip then is mechanically polished with another pair of brushes to reduce the roughness to less than 2.0 micron Ra, cold reduced to have a surface roughness less than 0.4 micron Ra and recrystallization annealed. The particulate shot has a size of 0.10-0.50 mm. The cleaning brushes have a surface density of at least 12% unit square surface area and the bristles of the cleaning brushes have a tip diameter of 0.13-0.50 mm.
摘要:
Process for continuously producing on a production line a rolled stainless steel sheet product having an improved surface state, characterized in that the hot produced sheet is subjected to a treatment comprising at least: a primary pickling for removing scale, cold rolling in at the most three rolling passes, a final annealing, a final pickling, and a cold rolling of the "skin pass" type. There is optionally effected, before the primary pickling, a stretcher levelling which produces a residual elongation of 1 to 5% for cracking the layer of oxide and rendering the sheet planar. Apparatus for carrying out the invention process is also described.