Open-die forging method

Details Open-die forging method Open-die forging method

1986-12-05

1988-12-06

Combs, E. Michael

Metal deforming

With cleaning, descaling, or lubrication of work or product

Lubricating

B21J 300

Patent

active

047888423

ABSTRACT:
The invention relates to a method and apparatus for open-die forging of workpieces in forging presses at high forging temperatures, more particularly steel billets or ferrous alloy billets between about 800 and 1250 degrees Celsius. In conventional open-die forging it is often not possible to complete the forging process in a single heat, and the workpiece must therefore be reheated. Also, with direct contact between workpiece and tool, cracks occur, particularly in the vicinity of bulges, the prevention or straightening of which requires repeated transverse hammer- or pressure-forging, so lengthening the cooling time. The total energy consumption for deformation and heating of the workpieces is therefore relatively high. Reduction of this energy consumption, a surprising improvement in product quality, and almost complete elimination of bulges are achieved by means of the invention, in that during forging the workpiece undergoes lubrication effective at the forging temperature, the lubricant being a fluid glass film. The lubricant is advantageously applied in the form of a fine powder.

REFERENCES:
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patent: 3561238 (1971-02-01), Tetzloff et al.
patent: 3756051 (1973-09-01), Rebsamen et al.
patent: 3840461 (1974-10-01), Espunes
Extruding Metals with Glass Lubricants, J. Delcroix Metal Progress, Jan. 1956, pp. 57-60.
Metals Handbook, 8th ed., vol. 5, American Society for Metals, Cleveland, (1970) pp. 41-43, 49, 53, 69, 74, 99, 101, 113, 117-118.
"Presses and Hammers", Schloemann AG, Dusseldorf, (1964) pp. 1-10.
Wehmeyer, W., "A New Lubricant and Protective Agent for thw Deformation of Steel in Rod and Tube Extrusion Presses", Schloemann AG, Dusseldorf, (Translation into English from Blech 11), (1964) pp. 1-11.
Wehmeyer, W., "Eine Neues Schutz-und Schmiermittal zum Unformen von Stahl in Strang-und Rohrpressen", (reprint from Blech 11), (1964), vol. 9.
"Open-die forghing plants", SMS Schloemann-Siemag AG, Dusseldorf, (1980) pp. 1-26.

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