Mitsubishi Materials Corporation

Toyota Jidosha Kabushiki Kaisha

Yoshihiko Kimura

Takayuki Azegami

Taro Abe

Tatsuo Arai

Takayoshi Saito

Takahiro Sato

Katsuhiko Sato

Hisashi Daiguji

Toru Nakamura

Noboru Aoyama

Satoshi Asakura

Yasuhiro Fukuyoshi

The holder for a head replacement-type cutting tool is provided with a holder main body and a tubular coupling memberwhich is housed in an attachment hole formed on the holder main body and made of a metal material lower in hardness than the holder main body. A recessed part is formed on an inner circumferential face of the attachment hole, the coupling member is engaged with the recessed part by firmly attaching the outer circumferential face thereof on the inner circumferential face of the attachment hole, and the coupling member is provided with an attachment screw part which is screwed into a head-side screw part formed at the replacement-type cutting head.

Holder for head replacement-type cutting tool and head replacement-type cutting tool

A head replacement-type cutting tool having a holder provided at the attachment hole with the fitting part formed in a tapered shape, and the leading end face is perpendicular to the central axis. The attachment part formed in a tapered shape protrudes on the cutting head from the rear end face perpendicular to the central axis of the cutting part. The cutting head is attached to the holder in such a manner that the attachment part is fitted into the fitting part by screwing the female thread part with the male thread part and the leading end face is in contact with the rear end face. The inner diameter to outer diameter ratio d/Dwhich is a ratio of the inner diameter d of the fitting part before being fitted in relation to the outer diameter Dof the leading end part of the holder is from 0.5 to 0.8.

Head replacement-type cutting tool

An exchangeable cutting head that is inserted into a mounting hole formed on a tool body, screwed on a mounting screw section provided on a bottom portion of the mounting hole, and is attached removably to the tool body, the exchangeable cutting head includes: a cutting head body including: a cutting portion provided at a front-end section; a mounting portion provided at a rear-end section and inserted into the mounting hole; and an engaging hole having an inner-peripheral face on which a recessed portion is formed, the cutting head body being made of a hard material; and a connection member including: a shaft portion that is inserted into the engaging hole, includes an outer periphery attached firmly to the inner-peripheral face of the engaging hole, and is engaged with the inner-peripheral face; a head screw section screwed with the mounting screw section; and a hole section formed inside of the head screw section and the shaft portion and along a center line of the shaft portion, the connection member being made of a metal material having a degree of hardness lower than a degree of hardness of the hard material and the connection member being connected to the cutting head body.

Exchangeable cutting head and cutting tool having the same

Eccentricity is not allowed to occur in a blade section, and a blade section is maintained in a stable installation state. A hook section, which is composed of a shaft sectionand an end sectionprovided with a corner sectionthat protrudes as a ledge farther to the outside in the radial direction than this shaft section, is formed in a blade section. A hook hole, which allows the passage of end sectionof hook section, is formed in a bolt section. Engaging sectionsare formed around hook hole. Corner sectionsof end sectionof hook sectionare engaged with engaging sectionswhen blade sectionand bolt sectionare relatively moved in the direction in which they move away from each other in the direction of an axis O in the state in which blade sectionis rotated by about 60&#xb0; towards the front in a direction of screwing rotation S with respect to bolt sectionafter inserting and passing end sectionof hook sectionthrough hook hole

Interchangeable blade cutting tool and blade section installed thereon

A throwaway insert and a cutting tool enable a high speed cutting operation for a metallic material having great ductility such as aluminum and obtaining a vertical wall with a high quality machined surface while improving chip control. The throwaway insert comprises a major cutting edge including a tapered cutting edge connected to a cutting edge of a nose portion, and a curved cutting edge connected to an end of the tapered cutting edge at a connection point. The curved cutting edge is formed so as to extend along an imaginary cylindrical surface whose center axis coincides with the axis of rotation of a tool main body, and tapered cutting edge is formed so as to gradually curve from the imaginary cylindrical surface toward the inside of the imaginary cylindrical surface as the distance from the curved cutting edge increases, and the distance from the nose portion decreases. The throwaway insert is attached to the tool main body in which the surface of the distal end thereof is machined so that surface roughness thereof is less than 3.2 &#x3bc;m when indicated by the Ry roughness.

Throwaway insert and cutting tool having throwaway insert

A solid end mill is provided which can prolong the useful life of the tool, without any adhesion to the work material, even aluminum or similar material, during a or cutting or drilling operation. The solid end mill includes a chip discharge flute, which is formed in the outer periphery of a nearly cylindrical tool main body. The nearly cylindrical tool main body rotates around a central longitudinal axis. A cutting edge is formed at a ridge portion on the outer periphery of the tool main body. The cutting edge is adjacent to a wall surface constituting a rake face of the chip discharge flute. The rake face faces in the tool rotational direction. A convex portion may be formed so as to be adjacent to and raised from a concavely curved portion. The concavely curved portion stretches to the cutting edge and is formed between the flute bottom of the chip discharge flute and the cutting edge.

Solid end mill

A cutting method using a vibratory cutting tool enables efficient creation of chips by breaking or separating of chips, and can retard both a deterioration of machined surface roughness of a workpiece and an increase in cutting resistance. The vibration of the cutting tool is controlled so that the following expressions are satisfied when letting a period of rotation of a workpiece be T, a period of vibration of the cutting tool be t.sub.total, the time required for the cutting edge to move from a farthest position in the feed direction to a farthest position in the direction opposite to the feed direction be t.sub.d, and the time required for moving from the farthest position in the direction opposite to the feed direction to a next farthest position in the feed direction be t.sub.u in the period of vibration of the cutting edge: T.apprxeq.t.sub.total .times.n+t.sub.d, where n is 0 or a positive integer; and t.sub.d .noteq.t.sub.u.

Cutting method by vibratory cutting tool

The invention is designed to improve a cutting performance and a spiral chip discharging ability. Main cutting edges 16 and auxiliary cutting edges 18 are formed along the respective sides of an upper surface 14 of a negative throw-away tip 12 and along side of bevelled corners, respectively. A rake face 22 of each main cutting edge 16 is gradually inclined toward a lower surface of the tip 12 by an angle of inclination .beta. along the extension of the main cutting edge 16 away from its adjacent auxiliary cutting edge 18 and by a rake angle .alpha. (&gt;.beta.) along a direction perpendicular to the main cutting edge 16. The tip 12 is mounted on a cutter 9 as a rotatable cutting tool so as to discharge spiral chips during cutting. To this end, the tip 12 is mounted such that an axial rake angle, a corner angle, an angle of inclination, and a true rake angle are set in a range of -4.degree. to -10.degree., a range of 25.degree. to 60.degree., a range of 0.degree. or larger, and a range of -20.degree. to -5.degree., respectively.

Throw-away tip and throw-away type cutter

The slicing machine of the present invention comprises a center blade-position detecting sensor arranged opposite a cutting area of an annular blade with a partially cut slice disposed between the center sensor and the cutting area of the blade. Two side blade-position detecting sensors are also provided at both sides of the center sensor and opposite the side adjacent areas of the cutting area. Three electromagnets are provided at corresponding positions to the sensors respectively, in order to control the deviations of the blade at each measuring point in accordance with the output signals of the sensors. Furthermore, a controlling device is provided in order to control currents to be supplied to the electromagnets in accordance with output signals from the sensors.

Growing community of inventors

Akashi, Japan

Yoshihiko Kimura