METHOD AND APPARATUS FOR CORRECTION TEMPERING ROLLING PART

Title:

METHOD AND APPARATUS FOR CORRECTION TEMPERING ROLLING PART

Document Type and Number:

WIPO Patent Application WO/1996/006194

Kind Code:

A1

Abstract:

A method and an apparatus for correction tempering a rolling part, in which the thermal treatment deformation of a steel rolling part is corrected in a very short period of time by utilizing the plasticity thereof occurring during the progress of variation of metallographic structure due to the low-temperature tempering of the same part. A rolling part (1A) which has been quenched is placed in correction molds (2, 3) and thermally pressurized at a maximum arrival temperature of 250-500 �C by a heating means. Thus, the deformation of the part is corrected at a processing rate within the range in which this part remains in its elasticity region at room temperature. When the part is heated, a high-frequency induction heating means can also be used besides a heat transfer heating means. A product requiring a correction time of within 6 minutes, or not more than 30 seconds when a high-frequency induction heating means is used, and having an inner and outer diameter deviation correction rate of not less than 60 %, a dimension uniformity rate of not less than 30 %, a surface roughness Ra of less than 0.2 'mu'm and a surface hardness HRC of not less than 56 is obtained.

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Inventors:

HIRAKAWA KIYOSHI (JP)
MAEDA AKITOSHI (JP)
SUGIYAMA HIROAKI (JP)
OHHORI MANABU (JP)

Application Number:

PCT/JP1995/001662

Publication Date:

February 29, 1996

Filing Date:

August 23, 1995

Export Citation:

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Assignee:

NIPPON SEIKO KK (JP)
HIRAKAWA KIYOSHI (JP)
MAEDA AKITOSHI (JP)
SUGIYAMA HIROAKI (JP)
OHHORI MANABU (JP)

International Classes:

C21D1/26; C21D1/30; C21D1/42; C21D9/40; C21D1/40; C21D1/673; (IPC1-7): C21D9/40; C21D1/18

Foreign References:

JPS569217B2	1981-02-27
JPS6237315A	1987-02-18
JPS59226118A	1984-12-19
JPS5835575B2	1983-08-03

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