摘要:
A sheet bar joining apparatus comprises a heater provided between a delivery-side clamp for clamping a rear end of a preceding sheet bar and an entry-side clamp for clamping a front end of a succeeding sheet bar; upper and lower anti-buckling plates provided on the entry-side clamp and located above and below the sheet bars; upper comb tooth portions and lower comb tooth portions formed in the upper and lower anti-buckling plates, respectively; a heat resistant insulator provided at a surface of each comb tooth portion opposed to the sheet bars; and a plurality of groove portions provided near the surface of each comb tooth portion opposed to the sheet bars.
摘要:
In the present invention, in cutting the top and bottom surfaces of a hot-rolled sheet by the rotation of milling cutters holding the sheet therebetween in the thickness direction of the sheet in the running process of the hot-rolled sheet, the cutting resistance determined by the cutting conditions including the type of hot-rolled sheet, the temperature in cutting, and the cut depth is controlled by the adjustment of cut depth, and cutting is performed by making the tension produced on the hot-rolled sheet by the cutting resistance lower than the breaking strength of the joint portion to prevent the breakage of hot-rolled sheet.
摘要:
In a continuous rolling line wherein the tail end part of a preceding rolled plate and the head end part of a following rolled plate are joined subsequently to a rough rolling and subjected to a following continuous finish rolling: a joining method of rolled plates wherein the tail end of the preceding rolled plate and the head end of the following rolled plate are formed into a nearly rectangular convex and concave shape respectively so as to inlay each other, the convex part and the concave part being combined each other in the same plane as the rolling lines, and then being fed to the continuous finish rolling; a joining method rolled plates wherein the side surface of the parallel inlay is formed in a taper shape in the direction of the plate thickness at any desired location of either the tail end part of the preceding rolled plate or the head end part of the backward rolled plate or of the both parts, and then being fed to the continuous finish rolling; and a joining method of rolled plates wherein the cut parts of the preceding and the following rolled plates are inlaid each other at the same plane, and joining only a part of the side edge of the inlay.
摘要:
A surface cutting apparatus for hot-rolled products cuts top and bottom surfaces of a hot-rolled steel product continuously or intermittently by passing the steel product between a pair of rotary drums (milling cutters) that rotate in a direction reverse to each other. The apparatus includes a disk having a larger diameter than that of the rotary drums at one or both ends of at least one of the rotary drums. The disk recognizes a gap between the rotary drums, allowing a zero adjustment to be made without excessively pressing the rotary drums. The measurement can be by a non-contact distance meter, eddy-current type sensor or other sensor.
摘要:
A surface cutting method for a hot-rolled steel product that includes a joint portion having a predetermined breaking strength includes a step of clamping the steel product between a pair of milling cutters that are arranged on top and bottom surfaces of the steel product, while the steel product is conveyed in a longitudinal running direction. The top and bottom surfaces of the steel product are subjected to cutting by rotating the milling cutters in a rotating direction. A cutting resistance applied to the milling cutters during the cutting is determined based on parameters including type of steel, width, thickness, surface temperature and conveying speed of the steel product, as well as circumferential speed and cutting depth of the milling cutters. The cutting resistance is controlled by adjusting the cutting depth of the milling cutters by actuators connected to the milling cutters, such that a tension lower than the breaking strength of the joint portion is applied to the steel product by the cutting resistance, so as to prevent breakage of the joint portion during the cutting.
摘要:
The known belt type continuous casting machine is improved in that a pair of guides for side dam block groups are disposed at opposite sides, in the widthwise direction, of a cast piece. Each of the guides includes guide beams disposed in two parallel rows displaced in direction of the thickness of the cast piece. Each of a pair of side dams which are movable in synchronism with feeding of the cast piece is formed of a side dam block group in one row. Each of the side dam block groups is divided into two sub-groups, each of which has a length longer than a contact length between the side dam block group and the cast piece and each of which is guided by a separate guide beam.
摘要:
An improved method and apparatus for grinding a rotary body, in which a rotatably supported grindstone is positioned in such manner that an extension of a rotary axis of the grindstone does not intersect a rotary axis of the rotary body and the rotary axis of the grindstone is inclined with respect to a plane perpendicular to the rotary axis of the rotary body to be ground. The rotary body to be ground is rotatably driven, and the grindstone is pressed against the outer circumferential surface of the rotary body to be ground in order that the outer circumferential surface of the rotary body to be ground can be ground by a relative slip produced at a contact point between the outer circumferential surface of the rotary body to be ground and the grindstone.
摘要:
The invention provides a method for improving the luster of a metal sheet surface without deteriorating the productivity and also in reducing the difference in glossiness between the upper and lower surfaces of the metal sheet at the time of cold-rolling. By making the velocity, after rolling of the metal sheet, equal to or larger than the rotational circumferential velocity of the work rolls, and by rolling the metal sheet with upper and lower work rolls crossed with each other in such manner that an angle of slip scratches left on the metal sheet surfaces becomes 5 degrees or larger and shear deformation in the widthwise direction can be effectively given to the metal sheet just before rolling, thereby improving the surface luster of the metal sheet. In addition, in the case where luster of the metal sheet surface is improved by changing the cross angle between the upper and lower crossing work rolls, the sheet configuration is corrected by a configuration control actuator, depending upon the sheet configuration of the metal sheet after the cross angle is changed. Furthermore, the difference in glossiness between the upper and lower surfaces of the metal sheet is reduced by selecting the cross angles formed by the upper and lower crossing work rolls with respect to the direction at right angles to the rolling direction and also employing rolls having different surface roughness as the upper and lower work rolls.
摘要:
Work rolls opposed to each other have shafts rotatably supported by upper and lower work roll chocks of a housing, a screw down device for applying a predetermined pressure to the upper work roll is provided in an upper portion of the housing, screw mechanisms capable of thrusting the work roll chocks in a horizontal direction are provided on an entry side or a delivery side of the housing, hydraulic cylinder mechanisms capable of thrusting the work roll chocks in the horizontal direction are provided on the other side, and contraction portions are provided in hydraulic supply and discharge pipes of the hydraulic cylinder mechanisms.
摘要:
A windshield device for a motorcycle includes a front cowl located at a front side of the vehicle body to cover a vehicle body; a windscreen disposed at an upper part of the front cowl so as to be vertically movable; an air introducing port for introduction of air from the front side being formed between a lower end of the windscreen and a front surface of the front cowl; and an air guide for guiding the air introduced through the air introducing port to flow rearwards along a rear surface of the windscreen, wherein the air guide is firmly attached to the rear surface of the windscreen.