Ipsen International, Gmbh

Ipsen Limited

Ipsen Industries International Gesellschaft MIT Beschrankter Haftung

Ipsen Industries International Gmbh

Bernd Edenhofer

Werner Hendrik Grobler

Thomas Eversmann

Peter Haase

Jens Bechthold

Wolfgang Lerche

Wolfgang Peter

Thorsten Requardt

Nils Bernhagen

Winfried Grafen

Dirk Joritz

Michael Lohrmann

Craig A Moller

Werner Gohring

Hans Pfau

Markus Reinhold

Hansjakob Drissen

Hendrik Grobler

Maz Roggatz

Jan-Willem Bouwman

Aloys Heisterkamp

A process gas preparation device for an industrial furnace system is disclosed. The gas preparation device includes a preparation reactor having a catalyst. A gas feed line and a gas return line are connected between the industrial furnace and the preparation reactor to form a closed loop. A compressor is situated upstream from the preparation reactor in the feed line. The preparation reactor is also connected with supply lines for hydrocarbon gas and air to be supplied to the preparation reactor. The process gas preparation device also includes a control device with which process gas preparation and return can be regulated and controlled. The gas feed line also has a shut-off valve. The control device can check the functional state of the catalyst by measuring the pressure differential across the catalyst and can initiate a burn-out process therein to clear clogging of the catalyst.

Process gas preparation apparatus for an industrial furnace system and an industrial furnace system for gas carburizing and hardening of metal workpieces utilizing same

A process for quenching heat treated metal parts using a liquid quenchant and high pressure is disclosed. In general, the process includes the steps of providing a load of heat treated metal parts in a pressure vessel wherein the load is at an elevated temperature after being heat treated. In a subsequent step, a liquid quenchant is injected into the pressure vessel such that a vapor of the liquid quenchant forms rapidly in the pressure vessel and cools the metal parts. The step of injecting the liquid quenchant into the pressure vessel is continued for a time sufficient to establish a desired peak vapor pressure in the pressure vessel. An apparatus for carrying out the disclosed process is also described.

Quenching process and apparatus for practicing said process

In a device for preparing process gases () for heat treatments of metallic materials/workpieces, the respective process gas () is to be fed into at least one treatment chamber () in an industrial furnace () having been practically fully prepared, homogenised and heated, and the method is to be carried out both with newly built and particularly with already existing installations of industrial furnaces () with the aid of the device, wherein the process gas () is prepared with compression at temperatures uncoupled from the temperature in the treatment chamber (), in a process separate from the heat treatment process in the treatment chamber (), and in a temperature range up to about 1250&#xb0; C., and is rendered usable for economical and low-emission heat treatment (FIG.).

Device for conditioning process gases for the heat treatment of metallic work pieces in industrial furnaces

For regulating process gases for heat treatments of metal materials/workpieces in industrial furnaces (), which have at least one treatment chamber (), at least one burnoff point () having at least one first valve (), and a regulator () having pressure meter (), the burnoff point () is only to be opened as a function of requirements related to the process gas. For this purpose, in a first step, with open first valve (), a quantity of a flushing gas () of the gas mixture () of the respective process gas is supplied in a controlled manner to the industrial furnace () and then burned off, in a second step, the valve () is closed, the industrial furnace () is regulated to a preset furnace pressure and this is permanently detected via the pressure meter (), in a third step, with the target pressure of the industrial furnace achieved, this pressure is detected via the pressure meter () and maintained, the first valve () further remaining closed. In a fourth step, the flushing gasification can be activated and adjusted. In the event of large pressure rise, in a fifth step, an overpressure flap () of the burnoff point () can be opened in a controlled manner via a fixed limiting value for pressure dissipation.

Method and device for controlling process gases for heat treatments of metallic materials/workpieces in industrial furnaces

In a method and with a device for preparing process gases () for heat treatments of metallic materials/workpieces, the respective process gas () is to be fed into at least one treatment chamber () in an industrial furnace () having been practically fully prepared, homogenised and heated, and the method is to be carried out both with newly built and particularly with already existing installations of industrial furnaces () with the aid of the device, wherein the process gas () is prepared with compression at temperatures uncoupled from the temperature in the treatment chamber (), in a process separate from the heat treatment process in the treatment chamber (), and in a temperature range up to about 1250&#xb0; C., and is rendered usable for economical and low-emission heat treatment (FIG.).

Method for conditioning process gases for the heat treatment of metallic work pieces in industrial furnaces

A method and a device for the heat treatment of metal materials in an industrial furnace involves a heating chamber having a treatment chamber and a quenching chamber utilizing protective gas and reaction gas.

Method and device for thermal treatment of metallic materials

A process for heat treating metal workpieces contains with respect to an efficient process control the following successive operations following directly one after the other: a heating phase; an enrichment phase; a first cooling phase; a bonding phase; a second cooling phase; and a concluding quenching phase. Workpieces processed by a method of this type are distinguished by a comparatively great fatigue limit and fatigue strength with simultaneous high resistance to wear and tear.

Method for heat treatment of metal workpieces as well as a heat-treated workpiece

A method and an apparatus for the thermal treatment of metallic workpieces with which gas quenching can be obtained that is low in distortion, even for workpieces with an undulating shape or workpieces that are projectingly stackable are provided. In accordance with the method, after being heated the workpieces are cooled in a quenching chamber with a quenching gas, whereby the quenching gas is intentionally caused to flow around the workpieces by means of guide channels that have a closed lateral surface and that enclose the workpieces along the direction of flow of the quenching gas. The apparatus comprises a quenching chamber in which the workpieces can be cooled with a quenching gas, and wherein guide channels are provided to ensure that the quenching gas flows around the workpieces, the guide channels having a closed lateral surface and enclosing the workpieces along the direction of flow of the quenching gas.

Method and apparatus for treatment of metallic workpieces

A method is provided for the thermal treatment of metal workpieces in a gas atmosphere containing nitrogen, in particular for nitrocarburizing iron articles. In order to obtain enhanced resistance to wear and corrosion in the treated workpieces, the nitrogen and carbon content present in the connecting layer of the case of the treated workpieces are intentionally adjusted by appropriately selecting the nitride coefficient K and the carburizing coefficient K of a reaction gas that contains ammonia, whereby hydrocarbons are added to the reaction gas for producing a relatively high carbon content in the connecting layer.

Method for the thermal treatment of metal

Method and use of an apparatus for the thermal treatment, in particular nitriding treatment, of metal workpieces

A method for plasma carburization of metal workpieces in a furnace includes the step of introducing a mixture of propane and methane into the furnace atmosphere. The propane and methane mixture is cleaved under process conditions of plasma carburization to release pure carbon into the furnace atmosphere.

Method for plasma carburization of metal workpieces

A device for heat-treating metallic workpieces in a vacuum has a revolving vacuum furnace with an inlet transfer lock for introducing a batch of workpieces into the revolving vacuum furnace and with an outlet transfer lock for removing the batch of workpieces from the revolving vacuum furnace. The revolving vacuum furnace has also an annular turntable for transporting the batch of workpieces from the inlet transfer lock to the outlet transfer lock. At least one carburization furnace, for carburization treatment of the batch of workpieces, is connected to the revolving vacuum furnace at least at a peripheral location of the revolving vacuum furnace between the inlet transfer lock and the outlet transfer lock in the direction of transportation of the batch of workpieces. The annular turntable transports the batch of workpieces to the at least one carburization furnace.

Device for heat-treating metallic work pieces in a vacuum

In a method for controlling the electric current density across a workpiece in a furnace during heat treatment in a plasma an auxiliary electrode with a known surface area is introduced into the furnace. A batch of workpieces is then introduced into the furnace. First a plasma of a neutral gas is generated within the furnace. The total current within the furnace and the current within the auxiliary electrode are measured. The surface area of the workpieces is calculated according to the equation ##EQU1## The auxiliary electrode is then switched off and a material-transmitting plasma is generated. The nominal total electric current for controlling a desired nominal current density is then calculated according to the equation

Method and device for controlling the electric current density across a

A probe for measuring oxygen potential, especially to determine the carboransfer properties of a furnace atmosphere containing the gases H.sub.2, CO, and CH.sub.4, with the probe having an oxygen ion conducting, solid measuring electrolyte with a contact electrode in the furnace atmosphere and a contact electrode in a reference medium that has a known oxygen concentration. To improve the accuracy of the measurement, an oxygen ion conductive compensation electrolyte in the form of a detachable solid body is connected between the contact electrode in the furnace atmosphere and the solid measuring electrolyte.

Method and apparatus for measuring the oxygen potential of a

An oven for the partial heat treatment of tools, for example, twist drills, omprises a first section, which contains the heating chamber that is constantly at the desired operating temperature. A second section for the loading and unloading and the quenching is provided. Between the two sections there is arranged a transport device for the charges of tools. The oven may be in the form of a one-chamber or three-chamber vacuum oven. The oven provides a high heat transfer rate, because the heating chamber is constantly at the desired operating temperature and the heat transfer by heat radiation under vacuum is started immediately when the charge is at its final position inside the heating chamber.

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Kleve, Germany

Bernd Edenhofer