Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A double action die set for closed forging to be equipped in a reciprocating press consisting of a stationary base and a slide. Each die is equipped with one set of a metal mold and a punch. A stationary side die is fixedly secured to the stationary base, while a movable side die is fixedly secured to the slide. Each one of the stationary side die and the movable side die comprises therein a metal mold supporting outer piston of hollow shape, a punch supporting inner piston slidably engaged with a hollow space in the outer piston, and a common oil chamber for supporting the outer piston and the inner piston with a same hydraulic pressure.According to this invention such advantages as to reduce the height of the die set and to move the pressurized oil only within the same oil chambers can be obtained.

Abstract: A balancer of a reciprocating machine having crank mechanisms includes an adjusting weight having one end supported by a reciprocating portion of a crank mechanism for the balancer. An adjusting weight support rotatably supports the other end of the adjusting weight with respect to a stationary portion of a body frame. The adjusting weight support is equipped with a weight support position altering mechanism for permitting alteration of the support position of the adjusting weight.

Abstract: A device for driving two winding drum shafts which are rotatably supported by the body of a coiler or un-coiler that acts to wind or unwind rolled material. A casing constituting a ring gear frame is disposed at the center of the body, which is revolved in a circle. Two ring gears each of which has external teeth and internal teeth are rotatably held to the casing. Two pinions mate with the internal teeth of these two ring gears. Two motors are provided to drive their respective drum shafts. When rotatory motion produced by each of these motors is transmitted to the drum shafts via the ring gear mechanisms, the mating engagement of the pinions with the ring gears results in a high reduction gear ratio. Another motor is also provided to revolve the body of the machine in a circle.