JPH07108409A - Varnishing drill - Google Patents

Abstract

PURPOSE:To increase a centripetalism and form a processing hole with high roundness by forming a pair of L-letter shaped grooves, a drill edge and a reamer edge and also making the periphery of each edge to a drill bore guide and providing a chip pool on the second surface of the reamer edge. CONSTITUTION:A varnishing drill 1 is composed of a straight or tapered stem part 11 and a edge part 12, a pair of L-letter shaped grooves 13a, 13b are arranged on the edge part, on whose tip sides drill edge 14a, 14b are formed. Reamer edges 17a, 17b consisting of notches 15a, 15b and second surfaces 16a, 16b are formed in an direction for orthogonally acrossing the drill edge 14a, 14b and margins 14c, 14d are formed on the periphery of the drill edges 14a, 14b and pad parts 17c, 17d for improving the accuracy of a drilled bore surface are formed on the periphery of the reamer edges 17a, 17b. A cutting pool is made by forming of the flank relieves 16a, 16b of the reamer edges 17a, 17b and the discharge of the chips is improved and the break of the edge and the damage on the drilled bore surface can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill having a combination of a drilling action and a reamer action which can greatly improve the accuracy of a drilled hole at the same time when drilling a metal or a non-ferrous metal. is there.

[0002]

2. Description of the Related Art Conventionally, a tool designed to improve the precision of a machined surface at the same time as drilling
As shown in FIG. 4 and FIG. 5 of Japanese Patent Publication No. 6, a pair of drill blades (5) is provided on the drill body, and a guide for this drill and a pad for blunting the work surface are provided on the outer periphery of the body. A drill having a face (7) is often used.

Then, as in the technique disclosed in the above publication, a pair of drill blades (16a) (16b) is provided on the drill body.
And a pad portion in a direction orthogonal to the blade and a second portion on the pad portion.
There are also those in which the cutting edges (20a) and (20b) are formed.

-1 / 4-

However, in the drill shown in FIG. 4 and FIG. 5 of Japanese Utility Model Laid-Open No. 2-94016, the cutting blade is only the drill blade that performs the boring action, and the accuracy of the processed hole is high. In order to increase the accuracy, the pad surface (7) is attached to the processed hole to puncture the drilling surface to improve the hole accuracy. With this drill, a lubricant is interposed between the pad surface and the drilling surface. However, this is an extremely difficult structure, and therefore, there is a risk that the drilling torque will be significantly increased, and that the punching phenomenon of the drilling surface may occur and the accuracy of the machined hole may be significantly deteriorated.

Further, a pair of drill blades (16a) (16b) and a pad portion are provided in the above-mentioned drill body in a direction orthogonal to the blades, and the pad portion has a second cutting blade (20a) (20).
In the drill formed b), the second reaming blade
The back metal of the cutting blades (20a), (20b) is not sufficient, and therefore the rigidity of the drill is reduced, and when the drill is drilled, the accuracy of the drilled hole is deteriorated and May occur.

[0006]

The present invention has been made to solve the above-mentioned problems, and has a high drill rigidity,
It is an object of the present invention to provide a burnishing drill which has good centripetal property and further reduces the drilling torque to improve the drilling property and the accuracy of the drilled hole. The means is a pair of L-shaped drills. Along with grooves, drill blades and reamer blades, the outer peripheral portion of each blade is used as a guide during drilling,
In addition, the reamer blade is formed by notching the end face of the drill body, and the chip ream is provided on the second face of the reamer blade.

[0007]

The present invention uses the above-mentioned means, that is, the pair of drill blades provided in the drill body and the outer peripheral portion of the -2 / 4-reamer blade as guides, so that centripetal property is greatly improved. Drill holes with high roundness can be obtained.

Further, since the reamer blade is formed by notching the end portion of the drill body, the rigidity of the drill becomes extremely large, and the bending of the drill caused by the lack of rigidity can be eliminated and the accuracy is high. Drill holes efficiently.

By forming the chip pool on the second surface of the reamer blade, it is possible to prevent the drilling torque from rising due to the biting of the generated chips, the cutting edge loss, and the scratching of the drilling hole.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an overall view of a burnishing drill according to the present invention,

[Figure 2]

[Fig. 1] is an enlarged view of a blade portion of

[Figure 3] is

2 is a bottom view of FIG.

[Figure 4] is

FIG. 3 is a front view or the like as viewed from the right side. The burnishing drill 1 according to the present invention comprises a straight or tapered handle portion 11 and a blade portion 12, and the blade portion is provided with a pair of L-shaped grooves 13a and 13b.
Drill blades 14a and 14b are formed on the tip side of the V-shaped groove. Notches 15a, 15 are formed in the direction orthogonal to the drill blade.
Reamer blade 1 composed of b and second faces 16a and 16b
7a and 17b are provided.

Margins 14c and 14d and reaming blades 17a and 17 are provided on the outer peripheral portions of the above-mentioned drill blades 14a and 14b.
Pad portions 17c and 17d for improving the accuracy of the punched surface are also formed on the outer peripheral portion of b.
The c · 14d and the pad portions 17c · 17d serve as a guide when the burnishing drill is drilled.

The margin 1 formed on the drill blade
4c · 14d and pad portion 17c · 1 formed on the reamer blade
7d may be formed to have the same diameter, but preferably the pad portions 17c and 17d are formed to be slightly larger in diameter than the margins 14c and 14d, and the precision of the perforated surface is further improved by using -3-4. .

Further, the reaming blades 17a and 17d are provided with notches 15a and 15 from the axial end face side of the drill toward the handle side.
By forming by b, the drill rigidity can be greatly improved and the rake angle of the reamer blade can be easily set to a desired one, so that various piercing conditions can be obtained and the flank face of the reamer blade can be obtained. Second surface 16a, 16b on the side
Due to the formation of the chip, it is possible to prevent chips from being accumulated and scratches from being formed on the cutting edge and scratches on the drilling surface by improving the dischargeability of chips generated during drilling.

[0014]

EFFECTS OF THE INVENTION The present invention, by means of the above-mentioned means and its action, greatly enhances centripetal property to obtain a machined hole with high roundness, and at the same time, greatly improves perforability.
A burnishing drill with highly efficient surface roughness of a machined hole can be obtained with high efficiency.

[Brief description of drawings]

 1. Burnishing drill 11. Handle 12. Blade portions 13b and 13b. L-shaped groove 14a, 14b. Drill blade 15a, 15b. Notch portion 16a, 16b. Second surface 17a, 17b. Reamer blade-4 / 4-

[Procedure amendment]

[Submission date] July 11, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is an overall view of a burnishing drill according to the present invention.

[Figure 2] is

[Figure 1] Enlarged view of the blade part

[Figure 3] is

[Figure 2] Bottom view

[Figure 4]

[Fig.3]

[Explanation of symbols] 1. Burnishing drill 11. Handle 12. Blade portions 13a and 13b. L-shaped groove 14a, 14b. Drill blade 15a, 15b. Notch portions 16a and 16b. Second surface 17a, 17b. Reamer blade

Claims (1)

[Reference number] 05-003P [Claims] 1. A reamer having a pair of L-shaped grooves, a drill blade, and a reamer blade, wherein the outer peripheral portion of each blade serves as a drilling guide, and the reamer blade is formed by a notch. A burnishing drill characterized by having a chip pool on the second surface of the blade.