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Patent Searching and Data


Title:
HEAT TREATMENT STEP SKIPPED PRODUCT DETERMINATION METHOD
Document Type and Number:
Japanese Patent JP2018118287
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a heat treatment step skipped product determination method which makes it possible to determine a work piece for which heat treatment is not sufficiently performed.SOLUTION: A heat treatment step skipped product determination method is used in a manufacturing method for a rolling connection rod bolt. In a rolling step (S4) after a heat treatment step (S3), work pieces (W1, W2) are arranged between a fixed round die (D1) and a movable round die (D2), a movable round die (D2) is moved forward to the fixed round die (D1), and the work pieces (W1, W2) are cut, thereby rolling the work pieces (W1, W2). Respective amounts (C1, C2) of cuts in the work pieces (W1, W2) are measured. If the amount (C2) of cut is larger than a permissible amount (CA1) of cut, it is determined that sufficient heat treatment is not performed for the work piece (W2).SELECTED DRAWING: Figure 3

Inventors:
MORIMOTO YOSHIFUMI
Application Number:
JP2017012117A
Publication Date:
August 02, 2018
Filing Date:
January 26, 2017
Export Citation:
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Assignee:
TOYOTA MOTOR CORP
International Classes:
B21H3/04
Attorney, Agent or Firm:
Ken Ieiri