摘要:
There is disclosed a method for electrical discharge machining of a workpiece in the form of a roll by application of an electrical voltage across said workpiece and an electrode or electrodes mounted opposite to each other with a predetermined gap therebetween, and more particularly such method wherein each such electrode is formed by plural electrode segments separated from one another by insulators, and the electrical discharge operation is performed with said electrode segments in each electrode short-circuited to one another in the rough machining step and with said electrode segments insulated from one another in the finish machining step for reducing the working time.
摘要:
When the invented flux is applied to an inclined welding, especially high speed welding of more than 3 m/min of a spiral welded pipe, desired shapes of beads may be obtained without creating so-called under-cut or excessive concave, whereby speed-up of the welding could be expected in the spiral seam, so that the producing efficiency is exactly increased in the spiral welded steel pipe production.
摘要:
There is described a rotary trough type cooling bed run-in apparatus for dropping the roll bars of a steel round bar mill onto a cooling bed in an aligned state at high speed and absent the warpage associated with similar devices. Several troughs each having a longitudinal opening and an axial opening are rotatably mounted. A roll bar is introduced axially into each of said troughs following which said opening is closed off by a cover to ensure that said bar will not be prematurely ejected. As said troughs move downwardly said covers are simultaneously removed to expose the enclosed bars and these are allowed to fall downwardly onto a cooling bed.
摘要:
A method and an apparatus for manufacturing a non-fired iron-bearing pellet, which comprise:supplying a green iron-bearing pellet containing a hydraulic binder and water into a treating furnace provided with a green iron-bearing pellet inlet at an end thereof and a non-fired iron-bearing pellet outlet at the other end thereof and having at least one heating gas blowing port and at least one heating gas discharge port, blowing through said blowing port into said treating furnace a gas containing a saturated steam at a temperature substantially equal to the heating target temperature of the green pellets, replenishing the heat of said gas lost through heat exchange with said green pellet with the condensation heat produced from condensation of at least part of the steam contained in said gas through heat exchange with said green pellets, and holding said green pellets at said target temperature for a prescribed period of time to harden said green pellets, thereby continuously manufacturing a non-fired iron-bearing pellets. The green iron-bearing pellets introduced into the furnace are first pretreated by contact with the gas which had been used to heat the already preheated pellets.
摘要:
There is disclosed the distribution of an amorphous refractory in a case where a lining frame is positioned within a molten metal vessel preliminarily lined with a permanent lining refractory and the amorphous refractory is cast into the space between the permanent lining refractory and the lining frame thereby applying a lining to the inner surface of the vessel.A conical distributor is arranged above the lining frame and the amorphous refractory is continuously delivered from a rotary chute onto the distributor so as to describe a concentric path of moving falling points.
摘要:
A method for cutting off a steel plate, wherein the steel plate is heated to a temperature within the range of from 950.degree. to 1,400.degree. C. at the time of cutting off the steel plate; the heated steel plate is placed on a roller table extending horizontally and positioned at a desired position so that a side edge of the heated steel plate is in contact with the cutting edge of at least one cutting knife on the roller table. The cutting edge angle of the cutting knife is within the range of from 10.degree. to 45.degree.. The cutting knife is then moved horizontally relative to the heated steel plate, in the width direction or the length direction of the steel plate, at a cutting speed of from 10 to 1000 cm/minute, thereby cutting off the steel plate by the cutting knife in the horizontal direction.
摘要:
A claw crane well suited for loading and unloading, transporting and stacking steel products such as blooms, includes a mast suspended from the crane proper to be moved vertically, a beam tiltably attached to the lower end of the mast, and a plurality of load carrying claw shifters and load unloading pusher means which are movably arranged on the beam.
摘要:
Described is a method for the production of ferrochromium and a rotary furnace employed in such method. Raw chromium ores, fluxes and carbonaceous reducing agent(s) are charged into a rotary furnace into which oxygen or oxygen-enriched air is blown to effect smelting reduction. Hot exhaust gases from the rotary reducing furnace are used for pre-heating and pre-reducing of the materials for saving the energy considerably as contrasted to conventional methods.
摘要:
An apparatus for straightening the bend in steel pipes, round bars and the like (hereinafter simply referred to as steel pipes). The apparatus includes a first straightener comprising a combination of concave rolls and a second straightener comprising a combination of a concave roll and a convex roll and arranged at least at the entry side or the exit side of the first straightener and the top rolls or the bottom rolls of the first and second straighteners are adapted to be moved vertically, whereby when one or the other of the first and second straighteners presses a steel pipe, the pressure application of the other straightener is released so that the bend extending practically over the entire length of the steel pipe is straightened and the bend in the end portions of the steel pipe is straightened by the second straightener, thus straightening the steel pipe in a short period of time with a high degree of accuracy.
摘要:
Disclosed is a walking beam and more particularly its driving mechanisms whereby a material placed on a plurality of stationary beams for transfer, e.g., a steel product such as a steel pipe or round bar is raised from below, moved forward and lowered again onto the stationary beams by a plurality of transfer beams and this process is repeated to effect the transfer of the material. Each of the driving mechanisms includes a first link for causing the transfer beam to make a circular motion and the first link is rotatable about a supporting shaft with a radius of rotation l. The supporting shaft is fitted in the forward end of a second link and is rotatable about a main rotating shaft with a radius of rotation 2l. Mounted also on the supporting shaft is a first gear which is rotatable along with the first link and the first gear is in mesh with a second gear mounted on the main rotating shaft. The driving of the second gear and the second link is controlled selectively such that one of them is driven and the other is locked or both of them are driven and in this way the feed length of the transfer stroke of the transfer beam is changed to 2l, 4l or 6l.