US 11,167,335 B2Granted

Method for producing pipe material

AssigneeMitsubishi Heavy Industries, Ltd.

InventorsHiroshi Kawamoto, Toyoaki Yasui, Yoichi Sano, Yoshihiro Kiyota

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Abstract

The purpose of the present invention is to provide a method for producing a pipe material and to provide a mandrel with which resistance between a member to be processed and the mandrel during bending processing can be reduced and overall processing time can be shortened. The method for producing a pipe material includes: a step for inserting a mandrel, which is provided on the inside thereof with a flow path through which dry ice powder flows and spray holes at the tip thereof for spraying the dry ice powder, inside pipe material; a step for spraying the dry ice powder from the spray holes inside the pipe material; and a step for performing bending processing on the pipe material wherein the mandrel has been inserted.

Claims6

Dependent claims

A method for producing a pipe material, comprising:

an insertion step of inserting a mandrel into a pipe material;
an injection step of injecting dry ice powder into the pipe material;
a bending processing step of performing bending processing on the pipe material into which the mandrel is inserted;
and
an injection stop step of stopping injection of the dry ice powder,
wherein the insertion step includes a first insertion step of inserting the mandrel up to a portion positioned in front of a processing portion of the pipe material to be subjected to the bending processing,
wherein the injection step includes a preceding injection step of injecting the dry ice powder to the processing portion inside the pipe material from the portion positioned in front of the processing portion after the first insertion step,
wherein the injection stop step includes a step of stopping the injection of the dry ice powder after the preceding injection step, and
wherein the insertion step includes a second insertion step of inserting the mandrel into the processing portion after the injection stop step.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/095,533Filed 12 Jun 2017
Priority: JP JP2016-13759712 Jul 2016
Published: US 2019/0105695 A111 Apr 2019
Granted: 9 Nov 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B21D 9/16
Bending tubes using mandrels or the like: auxiliary equipment, e.g. machines for filling tubes with sand
B21D 7/022
Over a stationary forming member; by use of a swinging forming member or abutment: over a stationary forming member only
B21D 9/04
Bending tubes using mandrels or the like: the mandrel being rigid
B21D 9/125
By pushing over a curved mandrel; by pushing through a curved die: by pushing through a curved die