Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1994-05-10
1995-09-19
Simmons, David A.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148641, 148663, 280608, A62C 5048, C21D 800
Patent
active
054512760
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for producing a ski edge made of quenched and tempered steel, which edge has a head having the running surface, and a flank projecting into the body of the ski, said flank being designed thinner than the head and being provided across its length with a great number of punched recesses and/or openings, with the subsequently specified successive process steps: hardening temperature and subsequent tempering; temperature with simultaneous cooling of the head;
A process of the type specified above is known from DE-OS 22 04 270. Ski edges manufactured according to said process have the advantage, on the one hand, that the head is very hard across the entire cross section due to formation of a martensitic structure, so that a long useful life of the ski edge is obtained without resharpening. On the other hand, due to the partial heating, the flank is returned to a substantially pearlitic structure, so that said flank is relatively soft and ductile and, accordingly, can be worked by punching with little tool wear.
Even though the known process offers the above-discussed advantages, it has not been possible to introduce it in practical life. Essentially, this has to be attributed to the fact that the ski edge so produced does not extend in a straight line, but is curved in various ways in the main plane of expanse. Attempts to avoid such unavoidably occurring curvatures, which are also referred to as saber deviations, have failed in the past on account of the fact that the occurring radii of curvature highly differ across the length of the profiled edge, so that it is practically impossible to adjust in the bending device the correct bending deformation.
The problem of the invention is to further develop the process of the type specified above in such a way that the ski edge produced according to said process extends in a completely straight line.
For solving said problem, the invention proposes on the basis of the process of the type specified above that during the quenching and tempering of the entire profiled edge, the deviation in the Rockwell hardness seen in the direction of the cross section and length of the profiled edge is adjusted to less than 2.degree. HRC; that the heating temperature and the duration of heating during the partial heating of the flank are kept constant across the length of the profiled edge; and that after the partial heating and prior to the punching, the profiled edge is subjected to a constant bending deformation, in connection with which the flank is stretched by a constant amount.
The invention is based on the finding that the unavoidably occurring saber deviations are substantially the consequence of changes in volume, which occur when the martensitic structure changes into a ferritic/pearlitic structure. The change of a carbon steel from a martensitic to a ferritic/pearlitic structure results in a volume contraction which, in the present case necessarily leads to pronounced saber formation because the after-treatment on the profiled edge takes place only on one side within the zone of the flank. Now, if it is assured through a suitable heat treatment that during quenching and tempering of the entire profiled edge, the deviations in the Rockwell hardness, i.e., in the formation of martensite, are minor seen in the direction across the cross section and the length of the profiled edge, on the one hand, and the heating temperature and the duration of heating, i.e., the formation of pearlite, are constant to the greatest possible degree during the partial heating of the flank across the length of the profiled edge, on the other hand, a uniform saber deviation is obtained across the length of the profiled edge, which deviation can be cancelled again during a subsequent bending deformation in a simple manner by a uniform stretching of the flank of the profiled edge.
The highly uniform formation of martensite in the profiled edge required according to the invention prior to the partial heating can be achieved, for example by carrying out during the qu
REFERENCES:
patent: 3508978 (1970-04-01), Shuin
patent: 4818839 (1989-04-01), Chastain
patent: 4987282 (1991-01-01), Chastain
patent: 5144109 (1992-09-01), Klingel
patent: 5204987 (1993-04-01), Klingel
patent: 5327634 (1994-07-01), Gagneux
C.D. Walzholz Produktions-Gesellschaft m.b.H.
Ip Sikyin
Simmons David A.
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