SYSTEM AND METHOD FOR ANNEALING OF AN ITEM, WHICH COMPRISES HEAT-SENSITIVE PARTS AND ANNEALED ITEM

摘要

A method and a system for stress-relieving annealing one or more first parts of a workpiece, wherein a second part of the workpiece contains heat-sensitive parts. A cooling jacket is placed around the part of the workpiece surrounding heat-sensitive parts such that the part{s) to be annealed are located outside the cooling jacket. The first part(s) are then heated individually by induction up to the annealing temperature of the material in a first annealing zone in the system while simultaneously cooling the second part of the workpiece located in the cooling jacket. After annealing, the workpiece is cooled in a cooling zone, as annealing and cooling of the workpiece occurs under a protecting atmosphere. The annealed workpiece is, e.g., connection ends on a valve housing where the connection ends are shaped by plastic deformation after mounting valve seats, valve body etc. in the central part of the valve housing.

主权项

1. A method for stress-relieving annealing at least one first part of a metal workpiece, where a second part of the workpiece contains heat-sensitive parts as the annealing occurs by individual heating of at least the first part of the workpiece up to the annealing temperature of the metal workpiece under a protecting atmosphere and under simultaneous cooling of the second part of the workpiece, wherein the method includes at least the following steps:
providing a cooling jacket around the second part of the workpiece surrounding heat-sensitive parts such that the at least one part to be annealed are located outside the cooling jacket; individually heating of the at least first part of the workpiece up to the annealing temperature of the metal workpiece under simultaneous cooling of the second part of the workpiece located in the cooling jacket; and cooling the workpiece;wherein annealing as well as cooling of the workpiece is effected under a protecting atmosphere.