heat-treating-forgings
2006/3/28 Views
Forgings are
subjected to final heat treatment or intermediate heat treatment to improve the
maohinabitity.
The processes that occur during heat treatment of forgings can
be divided into two groups — processesoccurring at temperatures above and below
Ac 3.
The temperatures of these processes are given below:
Forgings are heat treated in continuous furnaces
with complete mechanization of the heat treatment cycle and automatic
control.
Apparatus for Heat Treating Forged Turbine Blades.
The apparatus
consists of two pusher electric furnaces of the Eichelin type (Fig. 1)
[1].
The furnace dimensions are 1600 ? 400 x 6000mm.
The frame of the
furnace is welded. It is gastight,
which makes it possible to use a
protective atmosphere. The metal is heated either to 600 or 950~
The furnace
is heated by means of radiant tubes mounted on the side walls and in the
hearth.
The furnace is divided into six independently controlled zones. The
power to each zone is graduated
- – 50 kW in the first stage, 35 kW in the
second stage, 22.5 kW in the third stage, and 17.5 kW in the
fourth
stage.
The following production cycles are possible (Fig. 1):
a) The
forgings, passing through the furnace, are either transported to another section
(positions 7,8, 1, 2, 3, 4) or are transferred to a washer, after which they
arrive at the loading station (positions7,8,1, 2, 3, 5, 7);
b) in furnace 1
the forgings are heated to quenching temperature and in furnace 9 to tempering
temperature(positions 7, 8, 1, 2, 3, 5, 9);
c) in fully loaded furnaces the
treatment occurs in the same manner as in batch furnaces.
The forgings are
placed on trays of a heat resistant alloy (37% Ni, 17% Cr). The
loading-unloading time varies from 10 to 60 rain.
The apparatus is intended
for heat treating a wide variety of steels; the maximum throughput is 600kg/h,
which requires two workers.
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