摘要:
A continuous casting method includes the steps of continuously supplying molten metal into a mold through at least one feed nozzle connected to the mold through a break ring, with the feed nozzle, the mold and the break ring forming at least a portion of a continuous casting apparatus, and intermittently withdrawing a cast piece formed from the molten metal in the mold thereby creating pressure in a space formed at a connecting point between the break ring, the mold and the cast piece as a result of the withdrawal from the mold. A shield means is placed to seal-off space between the at least one feed nozzle, and the mold to prevent entry of gas into the continuous casting apparatus and the pressure is reduced in the sealed-off space to thereby eliminate a pressure differential between the pressure in the sealed-off space and the pressure created in the space formed at the connecting point between the break ring, the mold and the cast piece during the intermittent withdrawal from the mold.
摘要:
In a method and apparatus for withdrawing a strand in a horizontal continuous casting installation, the strand is withdrawn from a mold by a predetermined stroke and then retracted by a smaller stroke corresponding to shrinkage of the strand. This cycle of withdrawal and retraction is repeated intermittently. A strand withdrawing and retracting characteristic of a cycle is set in a control unit, and pinch rolls for withdrawing and retracting the strand are controlled based on the set characteristic. Actual withdrawing and retracting strokes of the strand are detected by a detecting device and the detected signal is compared with the set characteristic to produce an instruction signal which is fed back to the pinch rolls, so that the positional accuracy of the strand and the quality of the strand are improved.
摘要:
In a mechanical ignition type gas generator including a housing which consists of an upper outer shell container (diffuser) and a lower outer shell container (closure) fitted to each other in such a manner as to define an annular space for storing therein a gas generating agent, a priming charge, a cooling material and a filter, and in which said closure has a cylindrical space capable of fitting to, and storing, a cylindrical mechanical igniter on its lower surface and a plurality of caps ignited by an ignition pin of said igniter are disposed on the top wall of said space, a hole for communicating a priming charge room with the front surface of said caps is disposed inside said closure of said housing besides a cap hole for communicating the back surface of said caps with said priming charge room so as to prevent delayed ignition of said caps.
摘要:
A panel shutter device constructed in such a way that in the process of continuously moving each panel by a lifting shift along guides rails and a lateral shift along a housing rail, a guide rotary member engages or disengages a guide shaft projecting from the side of the panel opposite the driven side. At the time of descending of the shutter curtain, in order to prevent finger pinching as each panel is placed on the succeeding panels sequentially, each panel can be lifted or descended without causing a gap between panels of the shutter curtain by providing the support member suspended by a pivotable connecting chain.
摘要:
A GaAs epitaxial layer is formed on a semi-insulative GaAs substrate by use of a crystal growth technique which allows control on the order of atomic layer level. A metal film is formed on the GaAs epitaxial layer by use of the same crystal growth technique. Ions are implanted in source and drain high-concentration layer-forming regions, through the metal film, and are activated.
摘要:
A semiconductor integrated circuit device is disclosed which comprises a bipolar transistor and a field effect transistor, in which a gate electrode of the field effect transistor and a collector electrode of the bipolar transistor are formed from a common electrode layer of a high impurity concentration, and in which the collector region of the bipolar transistor comprises a region of a high impurity concentration having a conductivity type the same as that of the collector region of the bipolar transistor.
摘要:
A new fluoran derivative useful as a colorless chromogenic material has the general formula: ##STR1## wherein R.sub.1, R.sub.2, X, Y and Z have the same meaning as defined hereinbefore.
摘要:
A process is described for preparing benzophenone derivatives of a high purity in an extremely high yield from 3-phenylphthalide derivatives with the use of at least one oxidizing agent.
摘要:
A loudspeaker having a framework with a plurality of openings therein is fitted with an elastic body of a bitumen-containing urethane foam over the rearside of the framework to absorb the acoustic energy transmitted rearwardly from the speaker.