Gedia Gebrueder Dingerkus Gmbh

Bjoern Mueller

Patrick Mueller

Maik Winderlich

Thorsten Wisnia

Volker Flesch

A method of tempering a plate workpiece entails first fitting the plate workpiece with a shield between first and second shield parts each having a respective mask element so as to cover only an edge region of the workpiece while leaving a more central region of the workpiece exposed. The shield and workpiece are then put in an oven with the plate workpiece fitted between the first and second shield parts. The shield also comprises first and second seals on the first and second parts confronting each other and each displaceable on the respective part between a closely juxtaposed working position in which inner portions of the seals are spaced apart by a distance equal generally to a thickness of the plate workpiece and outer portions of the seal bear on each other and a starting position spaced more widely from and out of engagement with each other. The seals engage and clamp the workpiece in the working position.

Shield for heat treating a plate workpiece

The invention relates to a method for cooling a tool in a heat treatment furnace, wherein: the tool is supplied during normal cooling operation with coolant from a coolant reservoir through a supply inlet (), which coolant is returned into the coolant reservoir from the tool via a return flow (); the supply inlet () is coupled by means of an electric actuator () alternatively to the coolant reservoir or to the public water supply and the return flow () is coupled by means of a further electric actuator () alternatively to the coolant reservoir or to the public waste water system (); the actuators (′) are supplied with a feed current during normal cooling operation and held in a first position in which coolant is supplied to the tool through the supply inlet () from the coolant reservoir and the coolant is fed back through the return flow () into the coolant reservoir; and, upon interruption in the power supply, the actuators (′) are forced into an emergency position in which cold water is supplied to the tool through the supply inlet () from the public water supply and the water is discharged through the return flow () into the public waste water system ().

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Attendorn, Germany

Bjoern Mueller