Toyoda Koki Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Jtekt Corporation

Takayuki Yoshimi

Ryohei Mukai

Hiroshi Morita

Yoshihiro Mizutani

Masaaki Sato

Tomoyasu Imai

Yuji Kubo

Tadashi Kumazawa

Yasunori Kobayashi

Naoto Ono

Norio Ohta

Toshio Tsujiuchi

Koji Nishi

Yasuo Niino

Nobumitsu Hori

Masato Kitajima

Hiromichi Ota

Yukio Oda

Atsushi Saito

Tomoyuki Kasuga

Toshihiro Tsutsui

Mamoru Katsuta

Hisashi Nakamura

Satoshi Okubo

Masanori Matsumoto

Masao Ikeda

A grinding abnormality monitoring method and device for grinding a plurality of works of the same type are proposed which can improve the accuracy of judgment whether an abnormality is generated or not by properly setting a threshold value. According to the method or the device, by setting at least one of upper and lower limit values of a trial grinding load detected at the trial grinding of at least one of the works, an occurrence of grinding abnormality is judged when an actual grinding load detected at the actual grinding of work exceeds at least one of the upper and lower limit values thereof which varies depending on the time elapsed from the start of the actual grinding or a position of work relative to a grinding wheel.

Grinding abnormality monitoring method and grinding abnormality monitoring device

In a grinding machine grinding a workpiece W by a grinding wheel G to supply coolant to one of a grinding point P or the workpiece W by way of a relative movement between the grinding wheel W rotatably supported on a wheel slideand the workpiece W supported by a work support device, air layerflowing on a circumferential surface Gc of said grinding wheel G by blowing hydraulic jettransversally from one side to the other side of the grinding wheel G along the circumferential surface Gc at an upper stream position of a rotational direction of the grinding wheel G from the grinding point P. Mist of coolant blown by the hydraulic jetthrough a recovering portmounted on a wheel guardcovering a part of the grinding wheel G.

Grinding method and grinding machine

It is one object of a grinding machine and a grinding fluid supply-nozzle therefor according to the present invention to supply grinding fluid to a moving grinding point reliably, even if the surfaces of a grinding wheel is abraded up. A wheel headadvances/retracts to a workpiece. A grinding wheel G is carried rotatably by the wheel headand grinds an eccentric portion W of the workpiece. A grinding fluid supply-nozzlesupplies grinding fluid to a moving grinding point K where the grinding wheel G contacts the eccentric portion W of the workpiece. The grinding fluid supply-nozzleis made from a curve portion, an openingand a straight portionbetween the curve portionand the opening. The grinding fluid supply-nozzlespouts the grinding fluid to a grinding fluid supply point Pc upstream the grinding points K and Ks, even in the case that the grinding wheel G has been abraded up. Besides, the angle between the tangent of the grinding fluid supply point Pc and the grinding fluid spouted from the grinding fluid supply-nozzleis smaller than a right angle.

Grinding machine and grinding fluid supply-nozzle therefor

The present invention supplies coolant to a grinding wheel surface and reliably guides the coolant to a grinding point on the grinding wheel surface, thereby significantly reducing the amount of coolant to be used. In a grinding method and device for supplying coolant while grinding a workpiece W with a rotating grinding wheel, a fluid nozzleis disposed upstream from a grinding pointon the circumferential surfaceof the grinding wheel. The fluid nozzleblows a jet of fluid across an air layer, which is a layer of flowing air dragged along the circumferential surfaceof the grinding wheel, from one lateral side of the air layerto the other lateral side thereof. A grinding fluid nozzlesupplies coolant to a region between the grinding pointand a cutoff positionat which the fluid jet from the fluid nozzlehas deflected the air flow from the air layer. The coolant supplied from the grinding fluid nozzlecontacts the grinding pointon the grinding surface

Grinding method and device for the same

A cylindrical grinder includes a workpiece support section adapted to support a generally cylindrical workpiece and rotate the workpiece about a rotational axis, and a wheel head adapted to support and rotate a grinding wheel. The wheel head is moved relative to the workpiece support section, along a first direction parallel to a rotational axis of the workpiece and along a second direction perpendicular to the first direction in order to grind an outer surface of the workpiece. The wheel head is turnable relative to the workpiece so that a rotational axis of the grinding wheel can be tilted within a plane substantially passing through the rotational axis of the grinding wheel and the rotational axis of the workpiece, within a range extending across a reference plane perpendicular to the rotational axis of the workpiece. Further, link-type parallel link mechanisms for moving the grinding wheel are disclosed.

Cylindrical grinder, and mechanism for producing relative movement between grinding wheel and workpiece in cylindrical grinder

A cold-gas-blow-cooling type machining apparatus including a relative movement device which moves a workpiece and a machining tool relative to each other, and a cold-gas-blow supply device which supplies a cold gas blow to a machining point at which the workpiece is machined by the machining tool. The machining apparatus includes: a workpiece-temperature detecting device which detects a temperature of the workpiece; and a machining-condition control device which controls at least one of the relative movement device and the cold-gas-blow supply device, on the basis of the detected temperature of the workpiece. The machining-condition control device includes a cooling-condition control device which controls the cold-gas-blow supply device so as to control at least one of a temperature and a flow rate of the cold gas blow.

Device and method for cool air cooling type machining

A cold-gas-blow-cooling type machining apparatus in which a cold gas blow is provided to cool a machining tool and a workpiece while the workpiece is machined by the machining tool. The machining apparatus includes: a rectifying device which rectifies the machining tool; a workpiece-temperature detecting device which detects a temperature of the workpiece; and a rectifying-device control device which controls an operation of the rectifying device on the basis of the temperature of the workpiece which is detected by the workpiece-temperature detecting device.

Device and method for machining in which cool air cooling is used

A workpiece and a grinding wheel are rotated and the grinding wheel is moved in a direction parallel to the rotational axis of the workplace so as to grind a cylindrical surface of the workpiece. After a part of the cylindrical surface is ground, a rest device is advanced towards the workpiece so as to support the part of the cylindrical surface of the workpiece which has been ground. Under the condition, the remaining portion of the cylindrical surface of the workpiece is ground.

Method of grinding a workpiece

A method and apparatus for grinding a cylindrical surface of a workpiece by a traverse movement of a grinding wheel having a relatively narrow grinding surface. To improve the cylindricity of cylindrical surface, the traverse grinding is divided into a rough traverse grinding and a finish traverse grinding. In the rough traverse grinding, a traverse girding is carried out with a large depth of cut which would causes a deterioration of the cylindricity at one end of the cylindrical surface. In the finish traverse grinding, a traverse girding is carried out with a small depth of cut to improve the cylindricity. In another embodiment, one of grinding conditions such as the traverse speed of the grinding wheel, the rotational speed of the workpiece and the peripheral speed of the grinding wheel is changed when the grinding wheel approaches an end of the cylindrical surface at which the traverse grinding ends so as to make the grinding force constant, thereby improving the cylindricity of the cylindrical surface. In other embodiments, the position of the wheel head is compensated based upon the measured diameter of the cylindrical surface so that the entire area of the cylindrical surface has a desired diameter. This compensation also improves the cylindricity of the cylindrical surface.

Method and apparatus for grinding a cylindrical surface of a workpiece

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Toyohashi, Japan

Takayuki Yoshimi