JP3075126U - Taper reamer - Google Patents

Abstract

(57) [Problem] To provide a taper reamer capable of performing precision finishing while preventing clogging with cutting chips even when performing small-diameter drilling work. SOLUTION: In a taper reamer in which a plurality of linear cutting blades 2b are formed in a tapered shape, a chip discharge groove 2e is formed on an outer peripheral surface of a tip 2a of the linear cutting blade 2b to discharge chips at the time of cutting. It is characterized by.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a taper reamer used for drilling a chassis.

[0002]

[Prior art]

 Conventionally, a reamer is used to precisely finish a hole.However, a taper reamer, in particular, can finish a hole precisely while enlarging the hole diameter. In this case, it is possible to directly drill a hole without performing a preliminary hole cutting operation with a drill.

[0003] In this type of taper reamer, a concave groove as a blade escape portion is linearly formed between a plurality of straight cutting blades, and is configured to discharge cutting chips generated during cutting. I have.

[0004]

[Problems to be solved by the invention]

 However, in the above-mentioned conventional taper reamer, cutting chips tend to be clogged in the groove at the tip portion where the groove relief of the blade relief portion is shallow, which is generated between the straight cutting edge and the drilled hole during drilling work. The generated frictional heat promotes poor chip discharge.

[0005] As described above, in the conventional tapered reamer, at the tip portion where the depth of the blade relief is shallow, cutting chips are clogged in the blade relief and the cutting effect is reduced. Is not suitable.

The present invention has been made in consideration of the above-described problems in the conventional taper reamer. Even when a small-diameter hole drilling operation is performed, the hole is precisely formed by preventing clogging by cutting chips. It is intended to provide a taper reamer that can be finished.

[0007]

[Means for Solving the Problems]

 According to the present invention, in a tapered reamer having a plurality of linear cutting edges formed in a tapered shape, a chip discharging groove for discharging chips at the time of cutting is formed on an outer peripheral surface of a tip portion of the linear cutting edge. It is a tapered reamer formed.

[0008] According to the present invention of claim 2, the chip discharge groove is provided with a predetermined length extending from a tip of the straight cutting edge as a starting end and a part of the straight cutting edge being cut off obliquely. It is a taper reamer.

A third aspect of the present invention is a tapered reamer in which the chip discharge grooves are formed at positions of 0 ° and 180 ° in a cross section orthogonal to a center line of the tapered reamer.

A fourth aspect of the present invention is a taper reamer in which a hand-holding grip portion is formed on a base shaft portion of the straight cutting blade.

According to the first aspect of the present invention, when drilling a small-diameter hole using a taper reamer, chips are discharged through a chip discharge groove formed on the outer peripheral surface of the front end portion of the straight cutting blade. Chips do not accumulate in the groove of the blade relief (the straight groove recessed between the straight cutting edges) at the tip of the taper reamer, and the small-diameter hole can be precisely finished.

According to the second aspect of the present invention, since the chip discharge groove is formed to have a predetermined length in a state where a part of the straight cutting edge is cut off obliquely, separately from the concave groove of the blade escape portion, the taper reamer is rotated. As a result, the chips shaved by the straight cutting blade move through the chip discharge grooves and are discharged to the outside of the taper rim.

According to the third aspect of the present invention, since two chip discharge grooves are provided to face each other, the chip discharge effect can be further enhanced.

According to the present invention of claim 4, when drilling with a so-called hand reamer provided with a gripping portion, chips are smoothly discharged and cutting resistance is reduced, so that drilling is performed with little labor. Finishing work can be performed.

[0015]

[Embodiment of the invention]

 Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings.

FIG. 1A is a front view showing the configuration of the taper reamer of the present invention, and FIG. 1B is a left side view thereof.

In both figures, a taper reamer 1 is composed of a cutting blade 2 and a resin gripping portion 3 provided on a shaft on the base end side of the cutting blade 2.

The cutting blade 2 has a tapered conical shape with a sharp tip 2a, and a plurality of straight cutting blades 2b extending linearly are formed on the outer peripheral surface of the conical portion.

A groove-shaped relief 2c is formed between the straight cutting edges 2b. The depth and width of the relief 2c are increased toward the rear end of the cutting edge 2. ing.

A plurality of straight cutting edges 2b are obliquely traversed from the apex 2d of the straight cutting edge 2b, that is, a chip discharge groove is formed in a state where a part of the straight cutting edge 2b is cut off. 2e is formed with a length L. When the axial length of the cutting blade 2 is 50 mm, it is preferable that the length L of the chip discharge groove 2 e is 7 to 10 mm.

The chip discharge grooves 2 e are formed at positions of 0 ° and 180 ° in a cross section orthogonal to the center line of the cutting blade 2 (see 2 e and 2 f in FIG. 1B). More specifically, the chip discharge grooves 2e and 2f are formed in opposite directions and curved with respect to the rotation direction A of the tapered reamer 1 with reference to the 0 ° position and the 180 ° position, respectively. It is designed to reduce the discharge resistance of as much as possible.

In the present embodiment, the linear cutting blades 2b are formed 16 times uniformly over the entire circumference of the cutting blade part 2, but a part of the straight cutting blades 2b is formed by the pair of cutting blade discharge grooves 2e. Due to the cutout, the number of effective straight cutting edges 2b is limited to 10 only in the tip 2a.

In the above-described embodiment, two chip discharge grooves 2e are formed for the purpose of improving the discharge property. However, even with one chip discharge groove 2e, the chip discharge effect of the present invention can be obtained. Wear.

When a small-diameter hole is drilled using the taper reamer 1 having the above-described configuration, chips are discharged through the chip discharge groove 2e even when the depth of the blade escape portion 2c is shallow. It becomes possible to finish. Therefore, the cutting blade 2 can be effectively used from the front end to the rear end.

The grip portion 3 is provided for manual operation, and has a non-slip protruding ridge surface 3a and a concave groove surface 3b continuously formed in the circumferential direction similarly to a conventional driver handle.

As described above, since the chips are easily discharged from the chip discharge groove 2e even in the hand-held reamer having the grip portion 3, the cutting resistance is reduced. This makes it possible to perform the hole finishing work with little effort.

[0027]

[Effect of the invention]

 As is apparent from the above description, according to the present invention, when finishing a small-diameter hole using a taper reamer, a chip discharge groove formed on the outer peripheral surface of the tip of the straight cutting blade. Since the chips are discharged through the gap, the chips do not stay in the groove of the blade escape portion at the tip of the taper reamer, and the small-diameter hole can be precisely finished.

According to the second aspect of the present invention, since the chip cutting groove is formed by diagonally cutting the straight cutting blade, chips can be smoothly discharged.

According to the third aspect of the present invention, since two chip discharge grooves are provided, the chip discharge effect can be further enhanced.

According to the present invention of claim 4, when drilling with a so-called hand reamer provided with a gripping portion, the chip is smoothly discharged to reduce cutting resistance, thereby reducing labor. Can perform hole finishing work.

[Brief description of the drawings]

FIG. 1A is a front view showing a configuration of a taper reamer according to the present invention, and FIG. 1B is a left side view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Taper reamer 2 Cutting edge part 2a Tip part 2b Straight cutting edge 2c Blade relief part 2d Apex 2e Chip discharge groove 3 Gripping part

Claims (4)

[Utility model registration claims] 1. A taper reamer in which a plurality of straight cutting edges are formed in a tapered shape, wherein a chip discharge groove for discharging chips during cutting is formed on an outer peripheral surface of a tip portion of the straight cutting edge. Characteristic taper reamer. 2. The chip discharge groove is formed by extending a predetermined length with a tip of the straight cutting edge as a starting end and a part of the straight cutting edge being cut off obliquely. The described taper reamer. 3. The taper reamer according to claim 1, wherein the chip discharge grooves are formed at positions of 0 ° and 180 ° in a cross section orthogonal to a center line of the taper reamer. 4. The taper reamer according to claim 1, wherein a grip portion for manual turning is provided on the base shaft portion of the straight cutting blade.