Toyoda Koki Kabushiki Kaisha

Other

Jtekt Corporation

Toyoda Van Moppes Ltd.

Toyoda Van Moppes Kabushiki Kaisha

Toshio Asaeda

Masato Kitajima

Tomoyasu Imai

Shinji Soma

Ikuo Suzuki

Kunihiko Unno

Hajime Fukami

Tomohiro Inagaki

Akimitsu Kamiya

Yasuhisa Sekiya

Kazunori Hota

Hiroshi Takehara

Hiroaki Asano

Koji Nishi

Masashi Yanagisawa

Ryohei Mukai

Takayuki Yoshimi

Tamaki Tomita

Toshihiro Tsutsui

Takayuki Moroto

Takuma Kono

Masahiro Yoshida

Noboru Hiraiwa

Hayashi Kodama

Toshiaki Sakurai

Akira Suzuki

A plurality of segmented chips are reinforced by applying an adhesive to the circumferentially opposite end portions thereof, and the adjoining segmented chips adjoining in the circumferential direction are adhered to the circumferential surface of a disc-like core with the adhesives at the circumferentially opposite end portions being not jointed with each other. Thus, the segmented chips can be prevented from being loaded with an unnatural force even when the disc-like core with the segmented chips adhered thereto expands and contracts radially due to thermal expansion and thermal contract. Thereby, expansion and contraction of the disc-like core do not impose a compression stress or the like on adhesives situated between adjoining segmented chips.

Segmented grinding wheel and manufacturing method therefor

In a grinding wheel in which abrasive tips for rough grinding and abrasive tips for finish grinding are alternately bonded to a periphery of a disk type base rotating about a rotation axis, each abrasive tip includes the abrasive layer formed by bonding abrasive grains and a lower layer overlaid and integrally for led with the abrasive layer. The abrasive tip is attached to the periphery of the base at the lower layer. A Young's modulus of the lower layer of the abrasive tip for finish grinding relative to a load acting on the grinding surface of the abrasive tip in an inward direction of the grinding wheel is less than that of the abrasive tip for rough grinding. Thereby, the surface of a workpiece can be both rough-ground and finish-ground with superhigh-precision surface roughness with using one grinding wheel.

Grinding wheel

An abrasive tool includes an electroformed layer having superabrasive grains electroplated on an outer surface of the electroformed layer, and a plurality of dimples arranged on the outer surface of the electroformed layer using a mold with projections made of gel adhesive. The concentration of the abrasive gains is regulated by changing the number of the dimples (i.e., changing a dimple-area-rate). The gel adhesive preferably has a viscosity of 500,000 cP or smaller. The dimple-area-rate is preferably from 7 to 70%.

Abrasive tool and the method of producing the same

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

In a grinding wheel for use in a grinding machine, a plurality of grinding tips are bonded on the outer peripheral surface of a wheel core having a disk-like shape by bond. On both side surfaces of the wheel core are formed with depressions continuous with the outer peripheral surface of the wheel core. Bond is filled between the outer peripheral surface and the grinding chips, and filled in the depressions of the wheel core to form a bonding layer. Namely, the bonding layer has side portions which extends along both side surfaces of the wheel core in a radial direction.

Segmental grinding wheel

A CBN grinding wheel having a circular core and an abrasive layer formed on the peripheral surface of the core. The abrasive layer comprises high toughness CBN grains and medium toughness CBN grains, wherein the high toughness CBN grains are incorporated into the abrasive layer in a ratio of 10-80% by weight with respect to the total amount of the CBN grains.

CBN grinding wheel

A dressing apparatus for dressing an electroplated grinding wheel by crushing the top portions of the abrasive grains thereof. The abrasive grains are diamond grains or CBN grains. A role made of ceramics, or a ferrous role holding diamond grains on its outer periphery is used for crushing the abrasive grains. The grinding wheel is rotated in one direction and the role is rotated in the opposite direction so that the difference in surface speed between the role and the grinding wheel becomes substantially zero. The role is then advanced toward the grinding wheel to crush the top portions of the abrasive grains, so that the heights of the abrasive grains are roughly equalized, and many sharp cutting edges are formed at the top portions of the abrasive grains.

Method and apparatus for dressing an electroplated grinding wheel

A resinoid-bonded grinding wheel employing hard abrasives such as cubic boron nitride or diamond is formed with a support member made of a vitrified grinding wheel. The support member has sealing layers on the surfaces thereof for avoiding the penetration of coolant into the support member. A method for forming the wheel includes mounting a grinding element on a radial peripheral surface portion of the support member and applying a sealing layer to the remaining surface portions of the grinding element for preventing penetration of the coolant into the support member and generation of vibrations in the grinding wheel during operation due to rotational imbalance caused by the presence of coolant within the support member.

Resinoid bonded grinding wheel and method for forming such wheel

A resinoid-bonded grinding wheel employing the ultra-hard abrasives such as cubic boron nitride or diamond are formed with a support member which is made of a heat insulating material such as ceramics for preventing a thermal expansion of the grinding wheel and maintaining a precision grinding operation.

Resinoid bonded grinding wheel with support member made of a heat

Resinoid-bonded grinding tools are prepared by applying a liquid thermosetting resin to the circumferential surface of a disc-like base member and then after coating metal-coated abrasive grains with a liquid thermosetting resin, mixing the coated grains with a powdered thermosetting resin. The mixture of the coated grains and the powdered thermosetting resin is press-formed upon the surface of the base member and then thermally set by heating.

Method for manufacturing resinoid-bonded grinding tools

An apparatus for successively truing and dressing a grinding wheel made of cubic boron nitride (CBN) with a diamond-impregnated truing roll and a metal dressing roll. The truing and dressing rolls are rotatably mounted on a roll carriage which is slidably mounted on a grinding machine so as to feed the rolls toward the CBN wheel and thereafter traversely move the rolls along the wheel surface of the CBN wheel. After truing with the truing roll, a coolant fluid mixed with liberation abrasive grain is supplied toward a gap of a predetermined distance, smaller than the mean size of the abrasive grain, which is established between the CBN wheel and the dressing roll, so that the liberation abrasive grain acts to grind and remove bond material from the wheel surface in order to accomplish the dressing of the CBN wheel.

Growing community of inventors

Hekinan, Japan

Masato Kitajima