Cold Strip Research Articles

ヘガネス鉄粉より粉末圧延法で製造せる薄板の特性

First, the sintering and cold rolling conditions were determined with rolled strip from Höganäs iron powders. Second, the effect of various powder rolling factors on the physical and mechanical properties of sintered and cold rolled strips were investigated.The similar tendency in effect of powder rolling factors on the properties of sintered strip was observed. That is, with decrease of roll gap and rolling speed and with increase of powder feed, the apparent density, tensile properties were increased and electrical resistivity was decreased. In the case of cold rolled strips, the effect of powder rolloing factors was observed on the elongation alone. With increase of powder roll load the elongation was increased. The various properties of cold rolled strips produced by powder rolling method are compared favorably with those of conventionally produced strips.

冷間圧延用補強ロールスリーブにおける転動疲労被害のX線的観察

In order to detect the rolling contact fatigue damage, the changes of the diffraction linewidth within the surface layer of the roll sleeve served for cold strip mill has been investigatedby X-ray back reflection method. The results are as follows;(1) The fiber texture exists within the surface Iayer of about 60μ thickness. And, some upsand downs appear in the distribution curve of values of diffraction line width within the rangeof about 4mm depth from the surface.(2) On the occasion of giving a dressing on sleeve surface, if the thickness which is removedby each dressing was smaller than the thickness of range which is occupied by rolling contactfatigue damage, the becoming shallow of the depth of maximum damage follows in consequenceof the accumulation of damage.(3) The shape of the distribution curve of values of diffraction line width is phenomeno-logically understood as the results of the composition of each contribution due to fiber texture, accumulated fatigue damage and original crystal structure of this material.(4) The X-ray back reflection method applied to the surface during the successive etchingmay be utilized as semi-non-destructive detection of the rolling contact fatigue damage withinthe surface layer of roll sleeve.

An analysis of cold strip rolling

A method of analysis is presented for investigating the mechanics of cold strip rolling. This method takes into account the elastic deformations of the strip and the rolls and the effect of applied strip tensions, as well as the plastic strip deformations. Predictions of load and torque requirements for reducing strip of any material and dimensions are obtainable along with the pressure distributions between the rolls and the strip, the shape and length of the contact arc, and the resulting roll flattening. The only information required for the application of this method is the dimensions and elastic-plastic material properties of the roll and strip. The results of a number of numerical examples are presented and compared with experimental results to indicate limits on the accuracy of the method.

Intensification of the reduction regimes when cold rolling strip

Intensification of the reduction regimes when cold rolling strip

Measuring the coefficient of friction in cold strip rolling : Hiroshi Yamanouchi and Yuji Matsuura. Castings Research Laboratory, Report, WasedaUniversity, 1957, no. 8, p. 57–62

Measuring the coefficient of friction in cold strip rolling : Hiroshi Yamanouchi and Yuji Matsuura. Castings Research Laboratory, Report, WasedaUniversity, 1957, no. 8, p. 57–62

Surface friction and lubrication in cold strip rolling : P. W. Whitton and Hugh Ford. Institution of mechanical engineers, proceedings, v. 169, no. 5, 1955, p. 123–133 + 2 plates; disc., p. 133–140

Surface friction and lubrication in cold strip rolling : P. W. Whitton and Hugh Ford. Institution of mechanical engineers, proceedings, v. 169, no. 5, 1955, p. 123–133 + 2 plates; disc., p. 133–140

U.S. progress in titanium during 1957

Sponge capacity now 27,000 tons per year … continuous cold strip rolling with few intermediate anneals … three commercial heat treating techniques … a number of new alloys … increased competition from other metals.

鋼板製造の最近の進歩と諸問題

A number of new strip mills were and are being built in Japan, while the conventional sheet manufacturing method has almost become obsolete and is on the verge of being replaced thereby in the very near future.In the present study recent development achieved in hot and cold strip mills is described together with some problems accompanying therewith. And an introduction of an electrolytic tinning process is made as an example of the various new surface treating of sheets to be applied to strips.

Analysis of tandem cold reduction mill with automatic gauge control

MOST of the cold rolled steel strip which is produced today is rolled on tandem cold reduction mills. Fig. 1 shows a 5-stand mill with its unwind and winding reels. The strip fed into the mill has previously been hot rolled and pickled. Each stand, using a combination of pressure transmitted through the work rolls and interstand tension, reduces the strip thickness by as much as 50 per cent. When the delivered strip is later to be plated and made into tin cans, the nominal input thickness to this mill may be 90 mils and the delivered thickness 8 mils. Typical delivery speeds for this product are 3,000 feet per minute up to nearly 6,000 feet per minute. The subsequent operations upon the steel to obtain the finished product require that each coil of strip be rolled to close thickness tolerance. Although mill operators can and do control thickness by manual adjustment, this is difficult and tedious even for the most alert operators. Therefore, a completely integrated automatic gauge (thickness) control for a tandem cold strip mill has been built and placed in service for more than a year. Other equipments are being manufactured and some are being installed on other mills.

Sendzimir 20段可逆冷間圧延機による各種金属および合金の圧延に関する研究（第1報）極薄板に現われる“模様”に関する研究

In the rolling of metal foils by ZR 32-4 type Sendzimir Reversing Cold Strip Mill, the regularly spaced waves which were inclined to the rolling direction were sometimes observed on the strip surface. The occurrence of the phenomena was investigated. The results obtained are summarized as follows: (1) The occurrence of the waves was dependent on the front tension, but not the back tension essentially. (2) The critical values of front tension above which the waves could be suppressed had no relation to the materials of work roll. (3) The patterns of the waves were independent of one pass reduction. (4) No differences in microscopical or radiographical observation could be detected between the regions of waves and of no-waves. (5) The waves were thought to be a kind of the center buckling of strips, but neither to be the stretcher strain produced in aluminium alloys and mild steel, nor to be the herring-bone marking observed on copper alloys.

Surface Friction and Lubrication in Cold Strip Rolling

Surface Friction and Lubrication in Cold Strip Rolling

An X-ray thickness gauge for the measurement of hot-rolled strip steel

The increased demand for close control of rolling tolerances in hot or cold strip and sheet mills has led to the development of special X-ray thickness measuring equipment. It functions by measuring the absorption of X-rays in the material, and, from the results thus obtained, highly accurate deductions can be made regarding the thickness of the strip. A description of the radiation source, differential detection equipment and reference wedges is given.

Electrical drives for cold strip mills

Electrical drives for cold strip mills

The Calculation of Roll Force and Torque in Cold Strip Rolling with Tensions

From an approximate theory, equations are derived for roll force and torque with and without front and back tensions applied to the strip. Where tensions are applied the calculations for each pass take about an hour; without tensions, and with the use of curves given in this paper, they can be carried out in ten minutes. The accuracy of the calculations without tensions is within about 15 per cent. At the end of the paper there is a discussion of the energy relationships in rolling. At present this should be considered as speculative in character.

Electric Equipment for Cold Strip Reduction Mills

Electric Equipment for Cold Strip Reduction Mills

Discussion: “Metallurgical Aspects of Hot and Cold Strip for Deep-Drawing Requirements” (Angle, J. E., and McGarrity, W. F., 1937, Trans. ASME, 59, pp. 433–437)

Discussion: “Metallurgical Aspects of Hot and Cold Strip for Deep-Drawing Requirements” (Angle, J. E., and McGarrity, W. F., 1937, Trans. ASME, 59, pp. 433–437)

Metallurgical Aspects of Hot and Cold Strip for Deep-Drawing Requirements

Abstract It is the purpose of this paper to give a brief but specific discussion of the basic underlying metallurgical features of hot and cold strip. Recrystallization in hot rolling, effects of finishing temperatures on the grain structure and properties of hot strip, effects of hot and cold coiling, and information regarding forming and drawing qualities of hot strip are discussed. Operating features and limitations are pointed out. Cold-strip processing, together with physical properties and other requirements for deep-drawing work are outlined.

Note on the Effect of Chemical Combination on the Structure of the K Absorption Limit

The structure of the $K$ absorption limits of some chemical compounds was examined with the double x-ray spectrometer. This instrument has been previously described. The $K$ absorption limits of the elements Ag, Mo and Cu and the compounds ${\mathrm{Ag}}_{2}$S, ${\mathrm{Ag}}_{2}$O, also Mo${\mathrm{O}}_{3}$, Mo${\mathrm{S}}_{2}$ and ${\mathrm{Mo}}_{2}$${\mathrm{O}}_{3}$ were examined for increase in width or fine structure. The width for the pure element decreases with increasing atomic number. The general effect of the chemical action was to broaden the absorption limit, but there was little displacement. In one case, ${\mathrm{M}}_{2}$${\mathrm{O}}_{3}$, there was evidence of fine structure. The silver salts appeared to be considerably reduced by the x-rays.Effect of temperature on the K absorption limit.---Recent experiments of H. S. Read (Phys. Rev. 27, p. 373, April 1926, and 28, p. 898, Nov. 1926) indicate an increase of absorption due to temperature of the absorbing element. Also the results were interpreted as due to a shift in the absorption limit. This matter was examined with double spectrometer. A strip of Mo was heated to incandescence in vacuum. The position and form of the $K$ limit was compared to that for cold strip. They were identical. No effect of temperature was detectable. This method would probably detect one-tenth the displacement estimated by Read.