JPH11114785A - Drill chuck for drill polishing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform polishing even if a drill is short by thinning a drill chuck for drill polishing as far as possible. SOLUTION: A drill chuck 1 for drill polishing is constituted of four chuck claws 2 faced to one another so as to chucking a lead part 6 of a blade part of a drill 5 to be polished, a claw sliding cylinder 3 in which the chuck claws 2 are to be mounted on a claw sliding part 4 having the conical inner surface so as to be raised, lowered and slid, a claw holder 10 to be approached to the upper surfaces of the chuck claws 2, having the side peripheral part to be fitted to the upper peripheral parts of the chuck claws 2 so as to be turned, and provided with a drill inserting hole 9 exclusively used for drill polishing in the center part, and a chuck outer cylinder 7 in which the claw sliding cylinder 3 is fixed and the outer periphery of the claw holder 10 is screwed to the upper periphery of it so as to be turned. The drill inserted among the chuck claws 2 and to be polished is detachably fixed by the chuck claws 2 by turning the claw holder 10. Therefore, a thin drill chuck having the thickness in the range of 30 to 35 mm can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill chuck for drilling in the field of machine tools and metal working machines.

[0002]

2. Description of the Related Art In recent years, the applicant has filed Japanese Patent Application No. 8-34062.
As in No. 4, we are developing a drill grinder for drilling the edge of a drill for drilling with a machine tool or metal working machine.

[0003] The feature of the invention is that a drill for centering and chucking to a drill chuck can be accurately and simultaneously polished and thinned on the flank surface of the drill by a one-time chucking.

[0004]

However, as a drill chuck for chucking a drill to be polished, a conventional drill chuck has been basically used.

[0005] Therefore, since the rear portion of the drill chuck is mounted on the drive shaft of the drilling machine, the opening at the rear portion is large and the drill chuck becomes long.

Further, in the drilling of a small diameter such as a diameter of 0.5 to 4 mm, the length of the drill to be polished is often short, and in many cases, it cannot be polished by chucking the shank portion of the drill as in conventional drilling. .

In view of the above, the applicant has made four claws to chuck the lead portion of the drill blade. However, since the chuck portion becomes longer, the conventional chuck type drill chuck becomes longer and shorter. Was needed.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in order to solve the above-mentioned problems, the lead portions of a blade portion of a drill to be polished are chucked to face each other. A chuck jaw having four jaws, a jaw sliding cylinder for fitting the chuck jaw so as to be able to slide up and down on a jaw sliding portion having an inner surface in a mortar shape, and a side close to the upper surface of the chuck jaw. A claw holder having a peripheral portion pivotally fitted to an upper peripheral portion of the chuck pawl and having a drill insertion hole dedicated to drill polishing in the center; and a claw holder fixed to the claw sliding cylinder and fixed to the upper peripheral portion thereof. And a chuck outer cylinder that is rotatably screwed around the outer periphery of the chuck, and a drill to be polished inserted between the chuck claws is formed so that the claw holder is turned so as to be detachably fixed with the chuck claws. Providing a drill chuck for drill polishing characterized by the fact that: A.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A drill chuck for drilling a drill according to the present invention has a chuck jaw having four jaws for chucking a lead portion of a blade portion of a drill to face each other, and a mortar-shaped inner surface. A claw sliding cylinder that fits the chuck claw so as to be able to move up and down on the claw sliding part that has become displaced, and a side peripheral portion is pivotally fitted to an upper peripheral portion of the chuck claw by approaching the upper surface of the chuck claw. A nail holder having a drill insertion hole dedicated to drill polishing in the center, and a chuck outer cylinder which fixes the above-mentioned nail sliding cylinder and screws the outer peripheral part of the above-mentioned nail holder to the upper peripheral part so as to be pivotable. It is characterized in that a drill to be polished inserted between the chuck claws is formed so as to be removably fixed with the chuck claws by rotating the claw holder.

As shown in FIG. 1 to FIG. 3, the drill chuck 1 is formed by forming the oblique side portion of a chuck jaw 2 having a cross shape of a substantially vertical triangle with four claws opposed to each other into a mortar shape having a predetermined angle on the inner surface. Can be vertically slidably fitted to the claw sliding portion 4 which is concavely opposed to the claw sliding cylinder 3 and can be polished by chucking the lead portion 6 of the drill 5 for polishing at the vertical portion of the chuck claw 2. Like that.

As shown in FIG. 1, the claw sliding cylinder 3 is mounted inside a chuck outer cylinder 7 having a concave cylindrical shape and fixed, and a female screw 8 is formed inside the upper peripheral portion of the chuck outer cylinder 7. A male screw 11 is engraved on the outer peripheral portion of a crown-shaped claw holder 10 having a flat upper surface with a drill insertion hole 9 having a predetermined diameter dedicated to drill polishing at the center, and this male screw 11 is screwed into the female screw 8. Then, the claw holder 10 is rotatably mounted on the chuck outer cylinder 7.

A claw holder 12 is horizontally fixed to the inside of the claw holder 10 provided with the male screw 11 with a fixture 13 as shown in FIG. 1, and the chuck claw 2 is moved as close as possible. The claw holder 12 is rotatably fitted in each of the fitting holes 14 provided in the upper side peripheral portion of the chuck claw 2.

Then, the claw holder 10 is attached to the chuck outer cylinder 7.
The chuck claw 2 is turned up and down by screwing the male screw 11 and the female screw 8 with respect to
The drill 5 is slid up and down along the direction, and the chuck claws 2 opposed to each other expand and contract so that a drill 5 for polishing can be attached and detached.

As shown in FIGS. 1 to 5, the chuck outer cylinder 7 of the drill chuck 1 formed in a thin shape with the minimum number of parts is attached to a chuck holder 17 of a drill chuck holding arm 16 protruding from a drill grinder 15 as shown in FIGS. The drill chuck 1 is turned 180 degrees in the chuck holder 17 by operating the chuck handle 18 attached to the side of the chuck outer cylinder 7 to grind the flank surfaces on both sides of the cutting edge portion of the drill 5. Thinning can be done with one chucking. 19
Is a drill centering tool, 20 and 21 are grinders, and 22 is a grinder drive motor.

[0015]

FIG. 1 shows an embodiment of the present invention. The drill chuck 1 is adapted to polish a drill 5 having a diameter of 0.5 to 4 mm. As shown in FIG. Of drill diameter for chucking
The lead pitch of the drill 5 is set to 25 mm, which is equal to or more than five times the lead pitch.

The claw holder 10 is provided with a small-diameter drill insertion hole 7 having a flat upper surface capable of inserting a drill 3 having a diameter of 4 mm. The chuck claw 2 is held at 12 and is made as thin as possible.

Then, the outer peripheral portion of the claw holder 10 is screwed into the upper inner peripheral portion of the chuck outer cylinder 7, and the oblique side of the chuck claw 2 slides up and down on the claw sliding section 4 of the claw sliding cylinder 3. The drill 5 is attached and detached, and is polished by the drill polisher 15.

As described above, the thickness of the drill chuck can be made substantially equal to the thickness of the claw holder on which the chuck claw is fitted. For example, the thickness from the lower surface of the chuck outer cylinder or the lower end of the chuck claw to the upper surface of the claw holder is about 30 to 35 mm,
It was much thinner than before. for that reason,
Even a short drill of several tens mm such as 30 to 50 mm can be chucked and polished.

Further, as described above, the chuck portion of the chuck claw having a substantially right-angled triangular cross section is made vertical, and the outer peripheral side of the claw holder is screwed onto the chuck outer cylinder to move the chuck claw up and down, thereby performing drill polishing. Drill chuck can be configured with a minimum number of parts, and can be reduced in cost and size.

In the above embodiment, a description has been given of a polishing drill chuck having a diameter of 0.5 to 4 mm. However, a polishing drill having a diameter of 4 mm or more can also have a similar structure. can do.

[0021]

As described above, according to the present invention, the drill chuck for drill polishing can be constituted with a minimum number of parts, and the side peripheral portion of the chuck is moved closer to the upper jaw holder by approaching the upper jaw holder. A drill insertion hole dedicated to drill grinding is provided at the center so that it can be pivotally fitted to the periphery, so the drill chuck can be made very thin, and even a short drill can be chucked and polished. it can.

The thickness from the lower surface of the chuck outer cylinder or the lower end of the chuck claw to the upper surface of the claw holder is 30 to 35.
By using a drill chuck having a thin shape of about mm, the drill chuck for polishing can be made to be about 35 to 40 mm thin.

Further, by attaching the chuck outer cylinder to a chuck holder of a drill grinder, and attaching the drill chuck to the chuck holder so as to be able to rotate by 180 degrees with a chuck handle, even a short drill can be polished. The flank can be polished and thinned by chucking.

[Brief description of the drawings]

FIG. 1 is a side sectional view of one embodiment of the present invention.

FIG. 2 is a plan view of the above,

FIG. 3 is a rear view of the above,

FIG. 4 is a cross-sectional side view of the drill polishing machine according to the first embodiment;

FIG. 5 is a plan view of the same.

[Explanation of symbols]

1: Drill chuck 2: Chuck claw 3
... Nail sliding cylinder 4 ... Nail sliding part 5 ... Drill 6
... Lead part 7 ... Chuck outer cylinder 9 ... Drill insertion hole 10
... claw holder 15 ... drill grinder 17 ... chuck holder 1
8 ... Chuck handle

Claims (3)

[Claims] A chuck jaw having four jaws for chucking a lead portion of a blade portion of a drill to be opposed to each other;
A claw sliding cylinder in which the chuck claw is slidably fitted on a claw sliding portion having an inner surface formed in a mortar shape, and a side peripheral portion close to an upper surface of the chuck claw and an upper peripheral portion of the chuck claw. A claw holder fitted pivotably and provided with a drill insertion hole dedicated to drill polishing in the center, and the claw sliding cylinder is fixed, and an outer peripheral portion of the claw holder is rotatably screwed to an upper peripheral portion thereof. A drill for drilling, comprising: a chuck outer cylinder; and a drill to be polished inserted between the chuck claws is formed so as to be removably fixed to the chuck holder by rotating the claw holder. Chuck. 2. The drill chuck according to claim 1, wherein the thickness from the lower surface of the chuck outer cylinder or the lower end of the chuck claw to the upper surface of the claw holder is 30 to 35 mm. 3. The drill for drilling according to claim 1, wherein the chuck outer cylinder is mounted on a chuck holder of a drill polishing machine, and the drill chuck is mounted on the chuck holder so as to be able to rotate by 180 degrees with a chuck handle. Chuck.