Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Automotive Thermal Systems Co., Ltd.

Takaharu Maeguchi

Nobuyuki Hori

Hiroshi Kanasaki

Makoto Takeuchi

Hiroshi Ogawa

Naoki Ogawa

Takayuki Hagita

Tomoyuki Inoue

Kazuhide Watanabe

Katsuhiro Fujita

Takayuki Kuwahara

Yukio Michishita

Takahiro Ota

Masafumi Hamasaki

Masaki Kawasaki

Tomoshige Takata

Tomohisa Ota

Kazuya Tsutsumi

Takao Tsuruta

Yukihiro Kawai

Takafumi Hiro

Kosuke Kitamura

Yuichiro Nomura

Hideki Madokoro

A method for manufacturing a compressor scroll that appropriately impinges cavitation bubbles on target regions of a scroll. The method includes the step of water jet peening by jetting cavitation bubbles generated underwater by a water jet at a first side of an end plate (A) of the scroll (), with a center (P, P, P) of the cavitation bubbles being offset from a center (O) of the spiral shape of a wall portion (B) on the end plate (A) and the step portion (Aa) and the stepped portion (Ba) positioned at an outer peripheral portion of the cavitation bubbles (C).

Method and device for manufacturing compressor scrolls, compressor scroll, and scroll compressor

A water jet peening device includes a sealed vessel provided to cover a surface of a welded portion, and adapted to be in a sealed state where an internal pressure is higher than an outside, a jet nozzle adapted to jet high-pressure water to create a cavitation bubble toward the surface of the welded portion, inside the sealed vessel, and a pressure control hole adapted to be able to adjust the internal pressure of the sealed vessel. The water jet peening device can efficiently reform a tensile residual stress on the surface of the welded portion to a compressive residual stress.

Water jet peening device

A test piece preparation step of preparing a test piece () including a welding structure in which a welding material formed of an austenitic alloy is welded to a member formed of low-alloy steel or low-carbon steel, a hydrogen supply step of supplying hydrogen to the test piece (), and a characteristic stress acquisition step of applying a load (F) to the test piece () to which hydrogen was supplied and acquiring a characteristic stress showing material mechanical properties of the test piece () are executed.

Method for determining characteristic stress of welding structure, method for designing welded structure, and method for manufacturing welded structure

A condition setting process of determining peening conditions for water jet peening on a peening target object, an analysis process of analyzing a jet when a liquid is jetted from a nozzle model to a peening target object model and obtaining a void rate that is a volume rate of air bubbles contained in a unit volume of the liquid and a collapse rate that is a volume of the air bubbles collapsing in a unit time in the unit volume of the liquid in each position on a surface of the peening target object model, a shock pressure correlation value calculation process of obtaining a shock pressure correlation value that is a product of the void rate and the collapse rate in each position, and a range calculation process of obtaining an effective processing range in which the shock pressure correlation value on the surface of the peening target object model is greater than a predetermined value, based on the shock pressure correlation value in each position.

Method of pre-evaluating water jet peening, recording medium having program recorded thereon to execute the method, device for executing the method, and water jet peening method

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Tokyo, Japan

Takaharu Maeguchi