Abstract:
A casting solidification analysis method, which can analyze positions of shrinkage cavities more accurately than in the past, a casting method using the above method, and an electronic program are provided. A following casting solidification analysis method is provided. An amount of expansion/shrinkage for each solidification step length separated by inflection points in a cooling curve is determined, by setting a solid phase ratio at a completion of pouring to 0, setting a solid phase ratio at an end of solidification to 1.0, and determining the expansion/shrinkage amount for the each solidification step length by proportionally distributing the each solidification step length to the total solid phase ratio length.
Abstract:
An arrangement for use when thermally analyzing and modifying molten metal, by recording solidification data and controlling the structural modification of the molten metal on the basis of such data. The arrangement includes a sampling container made from a material which remains substantially stable at the temperature of the molten metal and which is adapted to receive at least one thermoelement for recording the solidification data. Means are also provided for taking a sample of the molten metal with the aid of the container, and for moving the sample to an area in which substantially the same conditions prevail. In addition, the arrangement includes recording means and means for modifying the structure of the molten metal as required. The sampling container is constructed to allow molten metal to pass thereinto when the container is immersed into the molten metal, and to allow a previous content of the container to be displaced therefrom and replaced with fresh molten metal as a result of relative movement between the container and the molten metal. Means are provided to ensure that a suitable quantity of molten metal is collected during a sampling operation. This may be achieved by providing the sampling container with openings which are closed and exposed by the valve means or by some other suitable arrangement.
Abstract:
In apparatus for picking up a test sample of molten metal or metal alloys and measuring the cooling curve of said sample, comprising a sample receptor and an optical conductor leading from the receptor to a transducer, the receptor is a small, open ended refractory tube having a cavity for receiving the molten sample arranged at the free extremity of a lance with the optical conductor contained within the lance and terminating at the cavity in said receptor and a barrier is disposed between the cavity and the optical conductor, the barrier consisting of a heat resistant, highly thermally conductive material of such quality as to cause the material of the melt sample which is picked up to adhere thereto.
Abstract:
According to the invention, the proposed digital device for automatically checking the carbon content in a metal with reference to the temperature stops on the cooling curves comprises a converter which converts the actual temperature of the metal into a numerical pulse code, said converter having applied to its input a signal carrying information on the metal's temperature, said converter having outputs consisting of code pulses corresponding to positive and negative temperature increments on the cooling curve; a reversible counter which converts the numerical pulse code into a parallel code, said reversible counter having its add and subtract inputs electrically coupled to the outputs of the converter; a clock pulse generator; a time interval discriminator whose code pulse inputs are electrically connected to the outputs of the converter, said discriminator's clock pulse input being electrically connected to the output of the clock pulse generator; a code storage register to store the codes corresponding to the temperature stops on the cooling curve, said register's information inputs being connected to digit outputs of the reversible counter, said register's control input being electrically coupled to an output of the time interval discriminator, a pulse being applied to said register at the moment when a temperature stop on the cooling curve is detected; and a digital display unit whose information inputs are electrically connected to digit outputs of the register.The device according to the present invention eliminates subjective errors which are bound to occur in any visual readout of data and makes it possible to fully automate the checking of the carbon content in a metal with reference to the crystallization temperature.
Abstract:
Apparatus capable of being immersed into a molten steel bath to obtain the temperature of the bath and the carbon content of a sample thereof. The apparatus is a hollow receptacle having a cavity capable of retaining and cooling a steel sample. The cavity contains a thermocouple which records the cooling characteristics of the steel sample and especially the liquidus arrest temperature corresponding to a phase transformation of the sample. The liquidus arrest temperature is used as a measure of the carbon content of the steel bath. A second thermocouple may be used to record the bath temperature directly. Also described are processes for controlling various steelmaking and refining processes, especially the basic oxygen steelmaking process.
Abstract:
A sampling crucible is disclosed with an asymmetrically placed divider, partitioning the crucible into two communicating chambers, one containing aluminum wire and a port, the other one housing a thermoelement. The divider has a tongue projecting through the bottom of the crucible and carrying a second thermoelement, effective outside of the crucible but covered for protection. The divider is constructed to integrate a lid for the crucible and a socket. Connecting wires for the thermoelements run through the divider, lid and socket.
Abstract:
A lance for taking a sample of molten metal comprising an outerhousing or elongated holder tube, a metal mould set at one end of the housing or holder tube, there being at least one opening in the housing or holder tube adjacent an opening in the mould to allow molten metal to flow into the mould when the lance is immersed in molten metal, a refractory lining to the mould, and temperature-sensing means within the mould adapted to record the liquidus arrest temperature of the sample within the mould.
Abstract:
An expendable thermocouple unit facilitates measuring temperature of a molten bath, obtaining a sample of the bath, and facilitates ascertaining the liquidus arrest temperature of the sample. The unit contains a single thermocouple within a cupshaped container having thin walls and good thermal conductivity so that the temperature of the sample may equalize the temperature of the bath through the container wall. The container has an entry port at one end so that the sample may enter thereinto to remote from the hot junction of the thermocouple.
Abstract:
A plug for an osmometry sample cup or vial is provided that seals the sample cup or vial to prevent significant evaporation of a sample solution in the cup or vial prior to obtaining an osmolality measurement.