Ntn Corporation

Masashi Kitai

Hideyuki Tsutsui

Satoshi Sugitatsu

Satoshi Fujimoto

Hidekazu Hirano

Kouma Katou

Kohei Higashi

Keiji Iwamoto

Youhei Migaki

Hajime Isa

Masanori Nishira

Hitoshi Shiotani

An abnormality diagnosis device according to the present invention detects damage to a bearing device based on vibration data on acceleration of the bearing device. The abnormality diagnosis device includes a first filter, a second filter, and a diagnosis unit. The first filter is configured to extract a first vibration waveform belonging to a frequency band from the vibration data. The second filter is configured to extract a second vibration waveform belonging to a second frequency band higher than the first frequency band from the vibration data. The diagnosis unit is configured to diagnose that there is damage to the bearing device when an evaluation value calculated by dividing a first amplitude of the vibration waveform by a second amplitude of a second vibration waveform at a time at which the first amplitude has occurred exceeds a determination value, the first amplitude exceeding a reference value.

Abnormality diagnosis device and abnormality diagnosis method

A state monitoring method and a state monitoring apparatus which achieve a lower error rate are provided. Rather than collectively processing whole measurement data, the state monitoring apparatus divides the whole measurement data into a plurality of segments and processes each segment. From the measurement data, training data and test data to which an anomaly detection approach is to be applied is randomly selected. By repeatedly calculating an anomaly ratio and averaging the anomaly ratios, a result of discrimination is stabilized.

State monitoring method and state monitoring apparatus

The present invention addresses the problem of providing a water-soluble cutting or grinding fluid that has excellent permeability and washability, that can be widely used in cutting or grinding, and that is particularly suitable for use in superfinishing. The present invention provides a water-soluble cutting or grinding fluid that contains a glycol compound (A), at least one substance (B) selected from the group consisting of organic amines and inorganic alkalis, a surfactant (C), and water (D), the water-soluble cutting or grinding fluid having a contact angle of 2 to 15&#xb0; as measured using the &#x3b8;/2 method one second after a drop of a dilution of the water-soluble cutting or grinding fluid is dropped on an SPCC-SB plate.

Water-soluble cutting/grinding fluid

A method of processing a crowned portion of a roller includes disposing first and second feed drums so as to extend parallel to each other, each of the first and second feed drums having an outer periphery formed with respective spirally extending threaded guide surfaces, the first and second feed drums being driven to rotate to transport the roller from a first location towards a second location through between the first and second feed drums, and successively processing the crowned portion of the roller, by means of a through feed processing with the use of a grinding stone. The threaded guide surface of one of the first and second feed drums is formed so that an angle of inclination of an outer peripheral surface of the roller relative to a processing surface of the grinding stone is varied in dependence on a roller passing position of the feed drum.

Processing method

A processing apparatus includes two feed drums, each having an outer periphery formed with a spirally extending threaded guide surface and adapted to be driven to rotate, disposed so as to extend parallel to each other, and the feed drums are used to pass a roller through between the feed drums by the rotation thereof while the roller is caused to rollingly contact the mutually opposed threaded guide surface, and also includes a grinding stone for processing a crowned portion of the roller passing thorough between the feed drums. The threaded guide surface of the feed drums is divided into two axially juxtaposed divided threaded surface areas so that an outer peripheral surface of the roller can be supported at two anteroposterior locations.

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Iwata, Japan

Masashi Kitai