A steel strip annealing furnace with a dew point control system. The furnace/control system can be more readily controlled to the desired dew point than the prior art control system and can handle the set point changes required as different types of steel coils are continuously run therethrough.

The present invention provides a power supply device and a power supply method for a DC electric arc furnace, wherein the power supply device comprises phase-shifting rectifier transformers, rectifying units and a regulator; through a structural design of a plurality of branches and a plurality of rectifying units at an output end of each phase-shifting rectifier transformer, and a structural design that outputs of the plurality of rectifying units are connected in parallel and then connected to a power supply short network of a DC electric arc furnace through bus bars, a current output topological structure is formed, which can provide a stable large current for one electrode assembly, and a plurality of current output topological structures can supply power to a plurality of electrode assemblies, so that requirement of a larger power supply current of the DC electric arc furnace can be satisfied; positions of top electrodes are judged and adjusted by the regulator according to real-time working parameters, which ensures that a lifting mechanism of the top electrodes can steadily perform the function of stabilizing arc burning for a long time; at the same time, output voltages and output currents of the rectifying units are adjusted by the regulator according to feedback of the real-time working parameters, so as to provide stable electric energy for the DC electric arc furnace.

The invention relates to a method for sealing a reduction assembly, wherein the reduction assembly has a product discharge device, wherein the product discharge device is supplied with sealing gas and wherein at least one compressor is provided for delivering prepared sealing gas to the product discharge device, wherein according to the invention, at least one nitrogen generator is provided for producing pure sealing gas, and wherein the sealing gas for supplying to the product discharge device is composed of pure sealing gas from the at least one nitrogen generator or composed of pure sealing gas from the at least one nitrogen generator and of prepared sealing gas from the at least one compressor. The invention also relates to a device with which the method according to the invention is carried out.

A steel strip annealing furnace with a dew point control system. The furnace/control system can be more readily controlled to the desired dew point than the prior art control system and can handle the set point changes required as different types of steel coils are continuously run therethrough.

There is provided a technique that includes (a) acquiring temperature data of at least one of a heater temperature defined by a temperature of a heater and a furnace temperature defined by an inner temperature of a process chamber, and acquiring a power supply value indicating an electric power supplied to the heater; (b) acquiring a reference temperature of the temperature data; (c) creating a predetermined equation using a prediction model of estimating a predicted temperature of the temperature data; (d) calculating a solution of minimizing a deviation between the reference temperature and the predicted temperature based on the predetermined equation; and (e) outputting a calculated power supply value calculated from the solution, and processing a substrate while controlling heating of the heater based on the calculated power supply value.

The present invention relates to a method of manufacturing a dental component, in particular a dental prosthesis or a partial dental prosthesis, by means of a dental furnace, comprising the following steps: (i) preparing a virtual model of the dental component; (ii) automatically selecting one, two or more programs and/or automatically preparing one, two or more programs and/or preparing one, two or more suggestions for a program for operating the dental furnace on the basis of the virtual model of the dental component; (iii) producing a model of the dental component; (iv) embedding the model in an investment material; (v) removing the model from the investment material, in particular by heating or burning out, to obtain a negative mold of the model; (vi) inserting a raw material required for manufacturing the dental component into the negative mold; and (vii) producing the dental component in the negative mold in the dental furnace on the basis of the selected, prepared, or suggested program.

In an example implementation, a method of operating a sintering furnace includes receiving information about a green object load to be sintered in a sintering furnace, determining a sintering profile based on the information, and performing a sintering process according to the sintering profile. During the sintering process, a sensor reading that indicates a degree of densification of a green object in the load is accessed from a densification sensor. The method includes initiating a cool down phase of the sintering process if the sensor reading has reached a target sensor reading.

Automatically generating a compensation factor for adjusting an operating parameter such that a measured carbon potential, dew point, or other controlled parameter matches the controller's set point value by inputting the measured parameter directly to the controller.

In an example implementation, a method of determining a sintering process endpoint includes monitoring gas flow through a detection gas line routed into a sintering furnace and through a furnace shelf on which a token green object is positioned. The method includes detecting a change in the gas flow when the token green object shrinks during a sintering process in the furnace, and determining that green objects being sintered in the furnace have reached a sintering endpoint when the change in the gas flow reaches a predetermined target.

In an example implementation, a sintering system includes a detection gas line to enable gas to flow into a sintering furnace from an external gas supply. The system includes a detection gas port inside the furnace through which gas from the detection gas line is to flow into the furnace, and a registration feature inside the furnace to enable positioning of a token green object proximate the gas detection port. The system includes a gas flow monitor to detect changes in gas flow through the detection gas line when the token green object shrinks during a sintering process in the furnace.