JPH09155698A - Drill chuck for polishing small drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To polish a cutting edge by a method wherein a drill in a wide range of 1.0-13mm in diameter has a lead part chucked by a single drill chuck. SOLUTION: Four chuck claws 5 are mounted on a claw holder 4 in such a state that each paired chucks are expandably positioned facing each other so that polishing is practicable with small diameter drill in a range of 1.0-13mm in a diameter chucked and the chuck claws are arranged internally of a drill chuck 1. The length of the chuck part 14 of the chuck claw 5 is set to a value higher than a lead pitch increased 1.5 times as large as a maximum drill diameter in which chucking is effected. The chuck claw 5 is chucked by the lead part 15, facing the chuck claw, of the drill.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing drill chuck for a small-diameter drill for drilling in the fields of grinding and polishing.

[0002]

2. Description of the Related Art Conventionally, a drill used for drilling a machine tool or the like is generally ground by a drill grinder when the blade edge is worn.

However, in the conventional drill polishing machine, the shank portion of the drill is chucked by the drill chuck and the blade edge portion of the drill is opposed to the polishing machine at a predetermined angle to perform polishing.

[0004]

Therefore, with a small-diameter drill, if the length becomes too short, it cannot reach the polishing table and cannot be polished, and it must be discarded or manually polished. I had to do it.

In the collet chuck, it is known that the lead portion of the drill is chucked, but it can be applied only to the range of the diameter of the drill which is similar, and the wide range of the diameter of the drill is 1.0 to 13 mm. For this, it was necessary to prepare collets with a large number of chuck diameters.

[0006]

The present invention has been made in view of the above points, and in order to solve the above problems, a small-diameter drill having a diameter of 1.0 to 13 mm is chucked. In order to be able to polish, a pair of four chuck jaws face each other so that they can be expanded and contracted, are mounted on a jaw holder, and are installed inside a drill chuck, and the length of the chuck portion of the chuck jaws is set to the maximum drill diameter of 1 Another object of the present invention is to provide a drill chuck for polishing a small diameter drill, which has a lead pitch of 5 times or more and is formed so that the chuck claw is chucked by the lead portion of the drill.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a polishing chuck for a small diameter drill, and four chuck claws are paired relative to each other so that a small diameter drill having a diameter in the range of 1.0 to 13 mm can be chucked and polished. The chuck jaws can be expanded and contracted in a direction such that the chuck jaws are attached to a jaw holder and internally provided in a drill chuck, and the chuck jaw length is set to a lead pitch of 1.5 times or more of the maximum drill diameter for chucking. The lead part of the drill is used for chucking.

If the drill has a large diameter, a conventional polishing machine can be used, but if the drill has a small diameter of 1.0 to 13 mm and wears or shortens it, as described above, the chuck rubs against the shank. If this happens, the blade edge will not reach the polishing table and polishing will not be possible.

Therefore, in the polishing drill chuck of the present invention, the length of the chuck portion of the chuck claw is set to 1.5 times or more the lead pitch of the maximum diameter drill for chucking, and the specifications of a plurality of conventional drill chucks are satisfied. Corresponding 1.0 to 1
A wide range of drills with a diameter of 3 mm are chucked and polished by the lead part of one drill chuck.

In the above-mentioned drill chuck, four chuck claws are arranged in an internal claw holder so that two chuck claws can face each other so as to be expandable and contractable at an angular interval of 90 degrees, and chuck the drill lead part. So that the cutting edge can be polished.

The four chuck jaws are fitted so that the outer peripheral surface on the front side thereof is shaped like a truncated cone on the inner peripheral surface of the fixed holder of the drill chuck, and the inner side portion on the rear side is extended. The chuck portion has a predetermined length and is fitted in the claw holder so as to be expandable and contractible in the radial direction.

The chuck claw is mounted on the claw holder so that the chuck claw slides integrally with the claw holder in the axial direction of the drill chuck along the fixed holder as described above.

The slide holder is mounted between the claw holder and the fixed holder thus formed, and the inner peripheral surface of the slide holder is screwed onto the outer peripheral surface of the claw holder to pivot the slide holder around the central axis. By doing so, the claw holder is moved in the axial direction of the drill chuck.

As described above, the chuck jaws are expanded / contracted so that the lead portion of the drill can be chucked or released, and even if the drill becomes short, the cutting edge of the drill can be polished through the drill chuck. There is.

In particular, since four chuck jaws are housed in the jaw holder so that two chuck jaws face each other, even if the lead portion of a small-diameter drill is chucked, the drill does not bend and the drill is centered accurately. It can be chucked, and the blade edge of the drill can be accurately ground.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 and subsequent drawings show an embodiment of a drill chuck of the present invention. As shown in FIGS. 1 and 2, the drill chuck 1 has a conical peripheral surface on the inner front side of a cylindrical fixed holder 2, and a claw holder 4 is mounted inside this through a block guide 3. .

The claw holder 4 has a cylindrical shape as shown in FIGS. 3 and 4, and is provided with a cross-shaped chuck claw sliding groove 5 on the inner side as shown in the figure and has an outer periphery on the front side thereof. A cross-shaped expansion / contraction regulation guide 6 penetrating the surface is provided.

Further, as shown in FIGS. 3 and 4, a bolt insertion hole 7 is axially opened in the above-mentioned claw holder 4, and a chuck claw locking piece 8 as shown in FIG. 5 is provided as shown in FIG. Bolt 9
6 and 7, the chuck claws 10 are locked in the locking grooves 11 formed on the side surfaces of the chuck claws 10 as shown in FIGS.
It does not move in the axial direction to the claw holder 4 but slides only in the radial direction so that it can be expanded and contracted, so that the drill 12 can be chucked and released.

As shown in FIGS. 1, 6 and 7, the chuck pawl 10 thus mounted has a substantially triangular front portion,
As described above, the outer peripheral surface of the fixed holder 2 is slidable along the frustoconical surface 13 of the inner surface of the fixed holder 2 so as to be able to expand and contract.

Then, as shown in FIG. 6, the inner side thereof is extended so that the length L of the chuck portion 14 is not less than 1.5 times the lead pitch of the maximum drill diameter for chucking, and the length L is as shown in FIGS. As described above, the lead portions 15 of the drill 12 of the chuck portion 14 are chucked facing each other every 90 degrees. Further, the rear extension of the chuck portion 14 of the chuck claw 10 is fitted into the chuck claw sliding groove 5 of the claw holder 4, which is opened in a cross shape, and the rear surface of the triangular portion 16 of the chuck claw 10 is cross-shaped. The sliding regulation guide 6 is mounted so that it can be easily assembled.

On the outer peripheral surface of the claw holder 4 thus formed, a precision screw 17 is engraved as shown in FIG. 3, and screwed into the precision screw 17 to form a drill chuck as shown in FIG. The main body 18 is fitted, the knob 19 is fixed to the rear end of the drill chuck main body 18 so that it can be attached, and the chuck gripping portion 20 on the peripheral portion of the drill chuck main body 18 is attached to a tool (not shown). Ready to use.

Further, an engaging portion 20 is provided on the outer peripheral portion of the above-mentioned drill chuck body 18, and a rear cover 23 is fitted through a plurality of steel balls 22 as shown in FIG. Part and the rear part of the fixed holder 2 are screwed so that they can be disassembled,
As described above, the claw holder 4, the chuck claw 10 and the like are incorporated.

When the drill chuck body 18 is rotated while holding the fixed holder 2 of the drill chuck 1, the claw holder 4 moves forward or backward.

When the claw holder 4 is moved forward, the front triangular portion 16 of the chuck claw 10 is fixed to the fixed holder 2 as shown in FIG.
The four chuck claws 10 are advanced along the frustoconical surface 13 of the
Shrinks in the radial direction, so that a drill 12 having a smaller diameter can be chucked.

On the other hand, when the claw holder 4 is moved backward, the four chuck claws 10 are expanded in the radial direction, contrary to the above.
A larger diameter drill 12 can be chucked.

Then, when the drill 11 is chucked, each chuck portion 13 is moved to the drill 1 as shown in FIGS.
The lead part 14 of 1 is fixed opposite to each other, and even if it is short with a small diameter of 1.0 mm or is worn and shortened, the tip of the drill 11 can be sufficiently protruded and the blade edge part is polished with a drill polishing machine. can do.

Particularly, since the chuck chucks the lead portion of the drill by facing the two chuck claws, the drill can be chucked with good centering accuracy without bending the drill, even if the lead portion is chucked. Can be accurately ground.

In the above, since the chuck claw has the extended portion extending rearward, the chuck holder can be easily assembled. However, appropriate alternative means can be adopted based on the spirit of the present invention.

Further, in the embodiment, a small-sized drill chuck which does not require a drive key or a handle has been described, but it is also applicable to a drill chuck in which a drive key is fitted to a bevel gear and chucked on the outer side. .

[0030]

As described above, according to the present invention, 1.0
It can chuck over a drill diameter of ~ 13 mm, and the chuck part chucks the lead parts of the drill in opposition to each other, and even if it is short with a small diameter of 1.0 mm or it is worn and shortened, the drill tip is sufficient. It can be projected and its blade edge can be ground with a drill grinder.

Especially, since the chuck part chucks the lead part of the drill in opposition to each other, the tip of the drill can be sufficiently projected even if the diameter is as short as 1.0 mm or the wear is short. The edge part can be ground with a drill grinder. And since the chuck's lead part is chucked with the two chuck claws facing each other, despite the chucking of the lead part, the drill can be chucked with good centering accuracy without bending, and the cutting edge part can be ground accurately. it can.

Further, since the chuck claw has the extended portion extending rearward, it is preferable because the chuck claw can be easily assembled into the claw holder.

[Brief description of the drawings]

FIG. 1 is a side half sectional view of an embodiment of the present invention;

FIG. 2 is a front view of the above,

FIG. 3 is a side sectional view of the above-mentioned claw holder part,

FIG. 4 is a front view of the above-mentioned claw holder part,

FIG. 5 is a front view of the locking piece of the above,

FIG. 6 is a side view of the above-mentioned chuck claw,

FIG. 7 is a front view of the chuck jaws of the above.

FIG. 8 is a side view of the above drill,

FIG. 9 is a front view of the above drill drill.

[Explanation of symbols]

1 ... Drill chuck 4 ... Claw holder
5 ... Chuck sliding groove 6 ... Expansion / contraction regulation guide 10 ... Chuck claw
11 ... Locking groove 12 ... Drill 14 ... Chuck part
15 ... Lead section

Claims (4)

[Claims] 1. A drill chuck is mounted on a claw holder such that a pair of four chuck claws can be expanded and contracted so as to face each other so that a small-diameter drill with a diameter of 1.0 to 13 mm can be chucked and polished. It is characterized in that the chuck claw is internally provided, and the length of the chuck part of the chuck claw is set to a lead pitch of 1.5 times or more of the maximum drill diameter for chucking, and the chuck claw is chucked by the lead part of the drill. Drill chuck for polishing small diameter drills. 2. A maximum length for chucking the length of the chuck part of the chuck claw by extending a predetermined amount of the inner part on the rear side of the chuck claw, which is formed into a truncated cone shape on the inner peripheral surface on the tip side of the drill chuck. The lead pitch is 1.5 times the drill diameter or more, and chuck claw slide grooves are radially provided at 90 ° intervals in the claw holder of the drill chuck to slidably fit the chuck claws and A cross-shaped expansion / contraction regulation guide is provided at the front end to regulate the movement of the chuck claws in the radial direction, and the claw holder can be moved in the axial direction of the drill chuck. 2. The small-diameter screw according to claim 1, wherein the chuck holder is rotated around the axial direction by screwing, and the chuck jaw is expanded and contracted to chuck the lead portion of the small-diameter drill. Polishing drill chuck Le. 3. The drill chuck for polishing a small diameter drill according to claim 1, wherein the chuck claw is engaged with the claw holder so as to be slidable in the axial direction of the drill chuck, and the chuck claw is locked to the claw holder. 4. A chuck claw is provided with a locking groove, and a locking piece is attached to the claw holder, and the locking claw of the claw holder is engaged with the locking groove of the chuck claw to drill the chuck claw. The drill chuck for polishing a small diameter drill according to claim 3, which is mounted so as to be slidable in a radial direction of the chuck without sliding in the axial direction.