Upsetting method and upsetting apparatus

Abstract

An upsetting method capable of eliminating a correction step by preventing occurrence of quench distortion is provided. The method includes the step of preparing an upsetting apparatus 10 equipped with a forming die 11 and a guide 20 having an insertion hole 21 for securing a diameter expansion scheduled portion 2 of the bar-shaped raw material 1 in a buckling preventing state and a punch 30. The diameter expansion scheduled portion 2 of the raw material 1 in a heated state is disposed in the insertion hole 21 of the guide 20 in a heated state, and the tip end portion of the guide 20 is disposed in the cavity 12 of the forming die 11 adjusted in temperature so as to be below a temperature of the raw material 1, and the raw material is secured to the securing portion 13 of the forming die 11. With this state, the guide 20 is moved in a direction opposite to a moving direction 37 of the punch 30 while axially pressurizing the diameter expansion scheduled portion 2 of the raw material 1 by moving the punch 30, to thereby expand the diameter expansion scheduled portion 2 of the raw material 1 exposed between a tip end portion of the guide 20 and the securing portion 13 of the forming die 11 within the cavity 12 of the forming die 11.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to Japanese Patent Application No. 2005-177991 filed on Jun. 17, 2005, and U.S. Provisional Application No. 60 / 693,407 filed on Jun. 24, 2005, the entire disclosures of which are incorporated herein by reference in their entireties.[0002]This application is an application filed under 35 U.S.C. §111(a) claiming the benefit pursuant to 35 U.S.C. §119(e)(1) of the filing date of U.S. Provisional Application No. 60 / 693,407 filed on Jun. 24, 2005, pursuant to 35 U.S.C. §111(b).TECHNICAL FIELD[0003]The present invention relates to an upsetting method and an upsetting apparatus for manufacturing various products, such as, e.g., an arm, a connecting rod, or a double-headed piston of compressors for use in vehicles (automobiles or railroad vehicles).BACKGROUND ART[0004]The following description sets forth the inventor's knowledge of related art and problems therein and should not be construed as an admission of kno...

AI Technical Summary

Benefits of technology

[0012]The preferred embodiments of the present invention have been developed in view of the above-mentioned and / or other problems in the related art. The preferred embodiments of the present invention can significantly improve upon existing methods and / or apparatuses.

[0013]Among other potential advantages, some embodiments can provide an upsetting method capable of eliminating a correction step by preventing occurrence of quench distortion.

[0014]Among other potential advantages, some embodiments can provide an upsetting manufactured product obtained by the upsetting method.

Problems solved by technology

However, subjecting the upsetting manufactured product to quench hardening among the heat treatments may sometimes cause quench distortion.

Consequently, the number of steps increases, resulting in an increased manufacturing cost.

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