摘要:
In a plural-roll rolling mill having a pass line arranged by the respective sets of rolls, each having a caliber formed on the outside peripheral surface thereof, the outside peripheral surfaces being disposed close to each other, the calibers of the rolls being cut with a cutting tool of a three-dimensionally (forward and rearward, rightward and leftward and upward and downward) movable cutting machine. The rolling mill, which has a reference column disposed on the outside surface thereof at a position spaced apart from the pass line by a predetermined distance, is removed from a rolling line and fixed, and the positional alignment of the cutting tool is carried out by causing a contact sensor disposed on the cutting machine at a position spaced apart from the cutting tool by a predetermined distance to come into contact with the reference column. With this arrangement, there are provided a method and apparatus capable of cutting the rolls of the plural-roll rolling mill while mounted on the rolling mill.
摘要:
In a plural-roll rolling mill having a pass line arranged by the respective sets of rolls, each having a caliber formed on the outside peripheral surface thereof, the outside peripheral surfaces being disposed close to each other, the calibers of the rolls being cut with a cutting tool of a three-dimensionally (forward and rearward, rightward and leftward and upward and downward) movable cutting machine. The rolling mill, which has a reference column disposed on the outside surface thereof at a position spaced apart from the pass line by a predetermined distance, is removed from a rolling line and fixed, and the positional alignment of the cutting tool is carried out by causing a contact sensor disposed on the cutting machine at a position spaced apart from the cutting tool by a predetermined distance to come into contact with the reference column. With this arrangement, there are provided a method and apparatus capable of cutting the rolls of the plural-roll rolling mill while mounted on the rolling mill.
摘要:
The present invention relates to a roll stand for bar and wire rod rolling mill, capable of being applied to various sizes of bars and wire rods by a small number of housing block sets, permitting maintenance work therefor to be carried out easily, and having characteristics in the housing thereof. The roll stand for bar and wire rod rolling mill according to the present invention is characterized in that the housing is divided into two, i.e. a roll block and a driving block by a plane including a position in which a driving gear and a driven gear are meshed with each other or a position in the vicinity of this position, whereby the number of housing block sets to be prepared is reduced. This enables the housing manufacturing cost to be lowered, and the replacement of a roll to be carried out efficiently.
摘要:
A four-roller type sizing mill apparatus for forming round steel rods, comprises two four-roller mills each having two pair of facing rollers. One pair of facing rollers is arranged in rolling direction perpendicular to the rolling direction of the other pair of rollers. The two four-roller mills are arranged in line, with the rolling direction of one of the two four-roller mills being shifted by 45.degree. from the rolling direction of the other four-roller mill. The two pair of rollers of a first four-roller mill positioned closer to the rolling material inlet are separated from each other by a distance which is greater than zero and not greater than five times the projected contact length of one of the pair of rollers positioned closer to the rolling material inlet. The distance is measured between a first standard straight line which passes through the centers of one of the pair of rollers and lies on a plane parallel to the side surfaces of the same pair of rollers and a second standard straight line obtained by projecting the axes of the other pair of rollers onto the above-mentioned plane.
摘要:
The present invention provides a rolling method and apparatus for manufacturing concrete-reinforcing steel bars, wherein the invention provides for obtaining various concrete-reinforcing steel bars satisfying the required specifications for knot height while using the same finishing rolls even if the diameters of the final product steel bars are different. According to the present invention, two pairs of rolls (total of four rolls) each having a roll caliber and one or more knotting round calibers are used for the final finishing pass, and the two pairs of rolls are arranged to exert rolling pressures in two orthogonal directions on a raw material S.
摘要:
An apparatus for guiding various sized round steel bars to calibers of rolls while stably holding the round steel bar. The round steel bar can be securely prevented from being twisted with a small amount of a holding force, so that a product with a desirable and accurate dimension can be manufactured. The guide apparatus comprises guide rollers installed at the inlet of at least one of a plurality of multi-roll sizing mills, each stand of which is composed of at least three rolls disposed in a line. The method of guiding the round steel bars comprises a step of elastically holding the free or unrolled surface portion of the round steel bar with a press force in the range of approximately 100 to 500 kg. With the round steel bar guide method and apparatus, a round steel bar is pressed and elastically held on the free surface of the guide apparatus.
摘要:
The present invention relates to a wire rod rolling line in which a finishing mill group rear stage is composed of a combination of a plurality of 4-roll mills. An object of the present invention is to provide a wire rod rolling line having a very high operating ratio capable of expanding a size free rolling range and at the same time capable of arranging pass schedules in which the pass schedule of an upstream pass is simplified in order to shorten a line stop time for adjusting mills. To achieve the object, the wire rod rolling line of the present invention is arranged such that three mills from the end of the finishing mill group are 4-roll mills, these three mills are installed in series with the reducing directions thereof dislocated by 45°, the two mills from the end are driven by a common motor and the third 4-roll mill from the end is separately driven.
摘要:
Solution casting of polymer film (76, 102) is provided. A dope (22, 115-117) containing a polymer of cellulose triacetate and solvent is cast on a casting support band (34, 121) which moves, to form a cast film (69, 122), and then the cast film is stripped from the casting support band and dried, to produce the polymer film. In the solution casting, the cast film is cooled shortly before stripping the cast film from the casting support band. Preferably, a cooling temperature to which the cast film is cooled is set lower than 6 deg. C. The cast film is cooled within a predetermined cooling region, disposed to start at a stripping point for the cast film, and to extend upstream therefrom with a length equal to or less than 25% of the length of the casting support band. The cast film is blown by cooling gas caused to flow for cooling.
摘要:
In a sizing rolling method carried out by installing at least 3 sets of 4-roll rolling mills in series, a central angle &thgr;1 of the perfect circle forming section of each rolling roll in a first path is set to less than 15°. The central angle &thgr;3 is set to at least 45° in a third path and the central angle &thgr;2 is set to at least 30° in a second path B. The groove of each rolling roll is arranged such that each escape section is composed of the tangential line of an arc formed by the perfect circle forming section. A roller guide having four guide rollers is installed on the inlet side of the second path and the free surface of a workpiece is held and guided by the guide rollers. An angle &agr; of the V-shaped groove of each guide roller is set similar to the angle (90°+&thgr;1) between straight lines forming the escape section of the adjacent rolling rolls in the first path. With this technology, even if a wire has a diameter of 7.0 mm or less, an excellent surface property can be obtained while securing a large size free range.
摘要:
First, second and third dopes each of which contains a solid electrolyte and an organic solvent are cast from a casting die provided with a feed block to a moving belt. A three-layer casting membrane is peeled off from the belt as a three-layer membrane containing the organic solvent. After being dried in a tenter device, the membrane still containing the organic solvent is contacted with a liquid which is a poor solvent of the solid electrolyte and having lower boiling point than the organic solvent. Thereafter, the membrane is transported to a drying chamber and dried while being supported by the plural rollers.