Twist drill sharpening machine
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0406195
(1982-08-09)
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발명자
/ 주소 |
- Maysilles Lynn A. (15140 Hidden Valley La. Rochester MI 48063)
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인용정보 |
피인용 횟수 :
6 인용 특허 :
1 |
초록
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An improved twist drill sharpening machine for sharpening two lip twist drills having a base, a chuck for chucking a drill bit W to be sharpened, and a grinding wheel spindle supported on the base, a grinding wheel fast on the spindle, the grinding wheel having a concave grinding surface profile on
An improved twist drill sharpening machine for sharpening two lip twist drills having a base, a chuck for chucking a drill bit W to be sharpened, and a grinding wheel spindle supported on the base, a grinding wheel fast on the spindle, the grinding wheel having a concave grinding surface profile on its periphery, an arrangement for moving the chuck and grinding wheel relative to each other so that the grinding wheel carries out metal removal grinding operations on the drill bit W for sharpening same, and the drill bit W being incrementally in-fed to the grinding wheel on an axis parallel to the grinding wheel axis while held disposed at an acute angle to the in-feed axis, an arrangement for flip-flopping the chuck and drill bit W through 180°rotational arcs of travel during in-feed of the drill bit W, an arrangement for cushioning the chuck and drill bit W at the ends of the 180°rotational arcs of travel, and an arrangement for automatically controlling of said in-feed and flip-flopping of the drill W and for returning it to its in-feed starting position upon completion of the grinding operation thereon.
대표청구항
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An improved twist drill sharpening machine for sharpening two lip straight shank twist drills, said machine being capable of sharpening different diameter drill bits over the commonly used range of drill sizes and drill lengths, said machine having a base and an in-feed table reciprocable on said ba
An improved twist drill sharpening machine for sharpening two lip straight shank twist drills, said machine being capable of sharpening different diameter drill bits over the commonly used range of drill sizes and drill lengths, said machine having a base and an in-feed table reciprocable on said base along an in-feed axis A, a chuck fast on said in-feed table and constructed to hold therein a drill bit to be sharpened, said drill bit having two clearance faces and two cutting edges thereon, a grinding wheel spindle and a grinding wheel reciprocable on said base along a grinding axis B perpendicular to said in-feed axis A, said grinding wheel having a concave grinding surface profile on its periphery in the form of a generated curve such that different portions of said profile correspond to the different drill sizes to be sharpened, said grinding wheel profile having grit and a matrix plated thereon so that it does not need wheel dressing during use thereof, means for holding said chuck on said in-feed table so that said drill bit is held at a workpiece axis C disposed between said axes A and B, the angle that workpiece axis C makes with grinding axis B being equal to one-half of the included angle of the sharpened point to be placed on said drill bit, means using the present point of said drill bit for loading it in said chuck and orienting it radially in respect thereto so that said edges are maintained substantially parallel to axis B, means for incrementally moving said in-feed table along axis A so that said drill bit reaches axis B, means for flip-flopping said chuck and said drill bit held therin at each increment of in-feed of said drill bit, said means for flip-flopping said chuck and said drill bit held therein rotating said chuck through alternate reversing arcs of 180 degrees, incremental in-feed of the drill bit occuring during every other 180 degree rotation of said chuck, an hydraulic cushioning device for absorbing the inertia of said chuck as it travels through said alternate reversing arcs, said cushioning device constructed to bring said drill bit to rest at a predetermined point in respect to grinding axis B, said chuck having an elongated hollow cylindrical body having an unobstructed axial cavity therein for receiving workparts to be clamped of indefinite length, a plurality of circumferentially spaced apart clamping jaws and a clamping ring moveably carried on said body, said clamping ring and said clamping jaws being interlocked with each other so that they move together in unison and fluid powered means for actuating said clamping ring to move said clamping jaws into clamping position about said drill bit to be clamped, said fluid powered means disposed outside of said body, said clamping ring disposed outside of said body, said clamping jaws operative through the outside wall of said body and moveable radially thereof so that they close substantially at the axis of said body, means for sensing the clamping and unclamping movement of said chuck and means responsive to said sensing for raising and lowering said grinding wheel in respect to said base substantially along axis D, means for cycling said grinding wheel back and forth along axis B in respect to said drill bit for carrying out a grinding operation thereon, said means for cyclically reciprocating said grinding wheel constructed and arranged so that during the sharpening process said grinding wheel makes at least two grinding passes across each clearance face of said drill bit, and means for retracting said grinding wheel to a static position remote from its cyclic path of travel to allow loading and unloading of said bit.
이 특허에 인용된 특허 (1)
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Bernard Arthur Alexander (Beecher IL) Bernard Richard Allen (Flossmoor IL), Twist drill sharpener and aligning fixture.
이 특허를 인용한 특허 (6)
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Arai Koichi,JPX, Drill abrasive apparatus.
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Saito, Manabu; Nakahata, Tatsuo; Takahashi, Hideharu; Watanabe, Masao; Nishino, Toshio, Drill and method of manufacturing drill.
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Douglas,Lawrence M., Drill bit dresser.
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Dovel, Daniel T., End effector with moveable jaw assembly to manipulate an article.
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Bernard, David A., Precision drill sharpener and grinding wheel assembly therefor.
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Dovel,Daniel T., Tool holder with moveable alignment finger.
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