Honda Motor Co., Ltd.

Kurita Water Industries Ltd.

Takafumi Murakami

Naoto Shibata

Masafumi Yamamoto

Masaki Kawamura

Mitsuru Kamikawa

Yutaka Takeuchi

Shunta Osako

Naoto Hitotsuyanagi

Kazuya Kumei

Isamu Katoh

Ko Sugai

A tool magazine of a machine tool holds machining tools of multiple types. The number of stored machining tools of at least one type is more than one. When all the machining tools of the at least one type are unused, a first test-machining step of machining a workpiece using one machining tool of each type is performed. When the machined product is graded as acceptable, a second test-machining step of replacing the machining tool of the at least one type with an unused machining tool in the tool magazine and machining a new workpiece using the one machining tool of each type is performed. The second test-machining step is repeated until all the machining tools are used.

Machining method implemented by machine tool

A drive shaft is configured by joining solid stub shafts formed of a medium carbon steel to both ends of a hollow tubular body formed of a medium carbon steel. When expressed as grain size number, the grain size of the hollow tubular body at joint parts where the hollow tubular body and the solid stub shafts are joined together ranges from #5 to #9, and the grain size of the solid stub shafts at the joint parts ranges from #10 to #12.

Drive shaft and method for producing drive shaft

An engine valve and a method of producing the engine valve are provided. The engine valve includes a shaft part and an umbrella part formed at one end of the shaft part. The engine valve opens and closes an intake port or an exhaust port of a combustion chamber of an internal combustion engine. Further, at least a portion of the engine valve that extends from the umbrella part to a position on the shaft part in a longitudinal direction thereof includes a valve body made of steel or nickel alloy, and a core member made of copper or copper alloy and provided inside the valve body.

Engine valve and method of producing the same

Disclosed is a ball for a constant velocity joint, and a method for producing the same. The ball for a constant velocity joint is produced via a quenching step for heating a spherical body consisting of a material corresponding to a high carbon chromium bearing steel regulated by Japanese Industrial Standards (JIS) to 840-900&#xb0; C. and then cooling the spherical body under such a condition as 10-25 vol. % of austenite remains up to a first part where the depth from the surface is 0.1 mm, a step for tempering the spherical body at 150&#xb0; C. or more, and a step for shot peening the spherical body and imparting a compression residual stress of &#x2212;1000 MPa or more to a region reaching second part where the depth from the surface is 0.2 mm.

Ball for constant velocity joint and method for producing the same

Dsiclosed is a method of treating fluoride-containing water, which comprises a reaction step where a calcium compound and/or an aluminium compound are/is added to fluoride-containing water while the pH value of the resulting suspended liquid is adjusted to fall within the range of from 6 to 8, and at least a part of the concentrated suspension to be formed in the membrane-separation step of the following stage is added to the suspended liquid and stirred and the resulting suspension is introduced into the circulation tank; a membrane-separation step where the suspension from the circulation tank is treated by membrane-separation to separate it into a permeated solution and a concentrated suspension; a circulation step where at least a part of the concentrated suspension to be taken out from the membrane-separation step is returned back to the reaction step while the remaining part thereof is circulated to the circulation tank; and a step where the permeated solution is taken out from the membrane-separation step as a treated water. The method is free from scaling disorder of the apparatus used and gives a treated water of high quality stably and efficiently.

Growing community of inventors

Tokyo, Japan

Takafumi Murakami