Heat treating furnace having improved hot zone

Details Heat treating furnace having improved hot zone Heat treating furnace having improved hot zone

1999-05-06

2000-02-01

Hoang, Tu Ba

Industrial electric heating furnaces

Resistance furnace device

With heating element detail

373128, 219520, 219532, H05B 366

Patent

active

060211555

ABSTRACT:
The present invention provides a high temperature vacuum furnace including a hot zone, which is made for heavy-duty heat treating applications. In a preferred embodiment, the hot zone chamber has an outer and an inner wall. The inner wall includes a heat shield secured to it for containing radiant energy. The hot zone chamber further includes a plurality of banks of electric resistance heating elements spaced axially within the chamber. Heating elements in furnaces according to this invention have a specially designed width-to-thickness aspect ratio, which enables heating elements to have a longer life between replacements. These heating elements can be designed in polygon banks or arrays, which virtually completely surround the workpiece and provide maximum temperature uniformity during heating.

REFERENCES:
patent: 4056678 (1977-11-01), Beall, III et al.
patent: 4259538 (1981-03-01), Jones
patent: 4559631 (1985-12-01), Moller
patent: 4608698 (1986-08-01), Moller et al.
patent: 4612651 (1986-09-01), Moller et al.
patent: 5497394 (1996-03-01), Jhawar et al.

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