Heating – Work chamber having heating means – Work chamber having gaseous material supply or removal...
Patent
1985-01-10
1986-05-27
Camby, John J.
Heating
Work chamber having heating means
Work chamber having gaseous material supply or removal...
266251, 431 1, 432 25, F27B 504, C21D 106, F23C 1104, F27D 700
Patent
active
045913390
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device a device for treating work pieces with an explosive gas mixture. In particular to a thermic deburring device. In such devices for thermic deburring of work pieces an unaimed removal occurs, whereby the total work piece is subjected to a heat shock. Preferably, corners and edges are removed since these locations absorb a lot of heat with a large surface and a small volume and are therefore oxidized or burned. The heat shock is generated by burning off a combustion gas-oxygen-mixture, whereby hydrogen, natural gas or methane is used as a combustible gas. The gas components are fed from a supply into one each dosaging cylinder and are pumped by means of a compressor under a considerable compression through valves into the work piece finishing chamber, whereby their admixing occurs in a mixing chamber. The compression of the gas components is uniformly large and corresponds towards the end of the filling in the work-piece finishing chamber to the pressure which is required for the given optimum combustion operation. The higher the combustion gas-oxygen-mixture has been compressed, the higher is the energy and the more severe is the deburring effect. The combustion temperature of the gas is in a range of 2500.degree. C. to 3500.degree. C. The heat amount released increases per volume unit with the increase of the pressure. The pressures generated in the work piece finishing chamber are about 40 bar when filling the chamber. During the explosion shortly after the ignition a pressure of about 700 bar is generated in the chamber. This short lived very high pressure stresses the construction parts of the mixing chamber which are connected to the work piece finishing chamber.
In a known device the mixing chamber is flanged onto the work piece finishing chamber as a structural part and contains, among other things a spark plug required for igniting the gas mixture. When igniting the gas mixture the explosion advances from the area of the spark plug in direction of the work piece finishing chamber. In the view of the high explosion pressure and the high combustion temperatures in the work piece finishing chamber the immediately connected mixing chamber is also subjected to very high stresses. In particular, a rapid contamination of the spark plug occurs which may result in a breakdown of the deburring device which operates in a cycle.
In order to avoid this a gas deceleration stage was mounted between the work piece finishing chamber and the gas mixing chamber with labyrinth or meander like extending lines. Thereby, the contaminations generated by the combustion pressure wave during deburring of work pieces in the work piece finishing chamber cannot reach the mixing chamber, but are caught in the lines of the gas deceleration stage.
In the known device the work piece finishing chamber, the gas mixing chamber and the gas deceleration stage are shaped as different blocks being flanged together. The material and manufacturing costs for these blocks are considerable, so that the purchase price of such an installation is rather high.
Summary of the Invention
The device in accordance with the invention and the present is advantageous in that the work piece finishing chamber also serves as the gas mixing chamber and that the gas deceleration stage is integrated into the work piece finishing chamber. Instead of three separare blocks the suggested device requires only one block for obtaining the same effects. Therefore, it can be made more cost effective and does not require much space in view of its compact structure in contrast to the aforedescribed known device. Furthermore, the suggested device permits shorter cycles during the finishing of the work pieces, since the gas components are already mixed in the work piece finishing chamber and penetrate from there through the lines of the gas deceleration stage into the ignition bore. The paths between the ignition device and the work piece finishing chamber are relatively short which has a positive effect on the
REFERENCES:
patent: 4487576 (1984-12-01), Martini
Conrad Hans-Jurgen
Pfeiffer Eberhard
Camby John J.
Robert & Bosch GmbH
Striker Michael J.
LandOfFree
Device for treating of work pieces with an explosive gas mixture does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for treating of work pieces with an explosive gas mixture, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for treating of work pieces with an explosive gas mixture will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1569566