SU558967A1 - Shaft furnace for nitriding - Google Patents

Description

(54) MINING STOVE FOR NITROGENING

one

The invention relates to the field of chemical heat treatment, in particular to furnaces used in the gas nitriding of steels.

A known gas nitriding furnace containing a lined housing with heaters, a muffle and a removable cover ij.

Simultaneously with the heating during the passage of the alternating current of industrial frequency in the furnace, an uncontrollable electromagnetic priest is excited. During operation, the heaters are automatically turned off to maintain the set oven temperature. The intermittent electromagnetic field does not allow to fully use its positive effect on the quality and rate of nitriding.

A shaft furnace and nitriding are also known, containing a lined casing with integrated heaters, a muffle and a removable cover 2j.

In this furnace, it is not possible to create an adjustable electromagnetic field and thereby improve the quality of nitriding and furnace performance.

The aim of the invention: is to increase the productivity of the furnace and the quality of nitriding

This is achieved by the fact that a solenoid coil is installed in the muffle with a gap relative to its walls.

The drawing shows the proposed oven in the cut.

The shaft furnace contains a lined case 1 with built-in heaters 2. In the case on the stand 3 paaMeajeH muffle 4, The furnace is equipped with a removable cover 5 with a fan 6, In the muffle 4 on the stand 7 with a collar 8, frame 9 with 1O winding made of wires (alloy X20H8O). The collar holder provides for the concentric placement of the solenoid coil relative to the container walls. At the same time, the coil on the stand is installed with a guaranteed technological gap between the walls and the bottom of the muffle. The power supply of the sschenoid coil is carried out through the supply And, made in the furnace case

The furnace works as follows. First, power is supplied to the heater 2 of the furnace. After reaching the working temperature in the furnace, alternating current of industrial frequency is supplied to the solenoid coil.

50 Hz. In the furnace, the electromagnetic field is excited, which is required by the technological process for nitriding the parts. Since the electromagnetic field exciter (solenoid coil) is made independently of the heaters, the generated field acts continuously in the furnace throughout the entire technological processing cycle and does not depend on whether the heaters are turned on or off. The resulting field is adjustable with a. by changing the strength of the current passing through the solenoid coil, the winding of which is selected in accordance with the parameters dictated by the technical process (changing the diameter, number of turns, the material of the winding wire),

Claims (1)

Formula invented and A shaft furnace for nitriding, containing a lined casing with integrated heaters, a muffle and a removable lid, characterized in that, with increasing performance and quality of nitriding, a coil salt coil is installed in the muffle with a gap relative to its walls. Sources of information taken into account in the examination: 1, Rustem S.L. Equipment and design of thermal workshops, M, Maiygiz, 1962, p. 23O-233, 2, Raitses V, B, Technologists of chemical heat treatment at machine-building plants, M., Mashinostroenie, 1965, s, 163, rice, 87. (prototype).