Title:
METHOD AND DEVICE FOR HARDENING SURFACES OF A CRANKSHAFT OR CAMSHAFT
Document Type and Number:
WIPO Patent Application WO2000063447
Kind Code:
A3
Abstract:
The invention relates to a method and device for hardening surfaces (10, 11, 12; 39, 40, 41) of a crankshaft (K) or camshaft (N), said surfaces being adjacently arranged in axis direction (A). According to the invention, the surfaces (10, 11, 12; 39, 40, 41) to be hardened are inductively heated by an inductor (14, 15, 16; 33, 34, 35) individually allocated thereto and are quenched after heating, whereby at least two adjacently arranged surfaces (10, 11, 12; 39, 40, 41) to be hardened are simultaneously heated. The aim of the invention is to make it possible to simultaneously harden closely adjacent surfaces while decreasing the risk of a defective hardening. To this end, the invention provides that, during simultaneous heating of the surfaces (10, 11, 12; 39, 40, 41) to be hardened, the inductor (14, 15, 16; 33, 34, 35) that is individually allocated to one of the surfaces (10, 11, 12; 39, 40, 41) is operated with a frequency (F1, F2; F3, F4) that differs from that of the inductor (10, 11, 12; 39, 40, 41) allocated to the immediately adjacent surface (10, 11, 12; 39, 40, 41) to be hardened.
Inventors:
GEZARZICK WALDEMAR (DE)
SCHWARZ HANS RUDOLF (DE)
SCHWARZ HANS RUDOLF (DE)
Application Number:
PCT/EP2000/003354
Publication Date:
March 29, 2001
Filing Date:
April 13, 2000
Export Citation:
Assignee:
ELOTHERM GMBH (DE)
GEZARZICK WALDEMAR (DE)
SCHWARZ HANS RUDOLF (DE)
GEZARZICK WALDEMAR (DE)
SCHWARZ HANS RUDOLF (DE)
International Classes:
F01L1/04; C21D1/10; C21D9/30; F16C3/02; F16C3/06; F16H53/02; (IPC1-7): C21D1/10; C21D9/30
Foreign References:
| DE19537738C1 | 1997-02-20 | |||
| DE4420092A1 | 1995-12-14 | |||
| DE3613909C1 | 1987-01-08 | |||
| DE4001887A1 | 1991-07-25 | |||
| DE4236921C1 | 1993-09-16 | |||
| DE19530430C1 | 1996-04-11 | |||
| DE19638008C1 | 1997-12-11 |
Download PDF: