JP3008154U - Reamer - Google Patents

Abstract

(57) [Abstract] [Purpose] A reamer that can be smoothly and efficiently executed with a small cutting resistance despite a small number of blades (3 or 4), and can easily regenerate against wear and contribute to cost reduction. Is intended for commercial use. [Structure] The number of blades is three or four, and approximately half or one-third of the blade length is formed on a tapered surface that narrows toward the center of the tip, and the tapered surface and a part following it. A feature is that a spiral groove is engraved on the blade surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reamer used for drilling work in a machine tool.

[0002]

[Prior art]

 The reamer is a tool for producing machining accuracy in drilling work, and has a configuration in which a large number of blades are formed in the lengthwise direction of a cylindrical outer periphery having the same diameter as the machining hole diameter.

[0003]

[Problems to be solved by the device]

 Usually, the number of blades of the reamer is set to about 5 to 7, and the higher the number of blades, the better the cutting efficiency, but there is a problem that the cost increases and the breakage easily occurs. The present invention intends to put on the market a reamer that solves such a problem.

[0004]

[Means for Solving the Invention]

 According to the present invention, the number of blades is 3 to 4, and approximately half or 1/3 of the blade length is formed on the tapered surface which becomes narrower toward the center of the tip, and the tapered surface and a part following it. A feature is that a spiral groove is engraved on the blade surface.

[0005]

[Action]

 Approximately half or about 1/3 of the blade length is formed on the tapered surface that becomes narrower toward the center of the tip, and by forming a spiral groove on the tapered surface and a part of the blade surface following this, a spiral groove is formed. It can be smoothly and easily introduced into the machined hole, and despite the fact that the number of blades is 3 to 4, the resistance can be reduced and the proper machined hole accuracy can be obtained efficiently.

[0006]

【Example】

 FIG. 1 is a front view of a reamer according to the present invention, and FIG. 2 is a side view thereof. 1 is a reamer main body, and the number of blades is 3 as shown in the figure, and approximately half or 1/3 of the blade length 1 (1/3 l in the example) is reduced toward the center of the tip. Is formed on the tapered surface p, and the spiral groove 2 is formed on the surface.

Therefore, in the present invention, the spiral groove 2 is also formed in a part of the blade surface m following the tapered surface p, and in the illustrated example, the spiral groove 2 is about 1/2 of the blade length l. It has a structure that covers a range. In the drawing, 3 is a chip escape groove.

The above is the case where the number of blades is three, but the case where the number of blades is four is similarly configured.

[0009]

[Effect of device]

 The reamer according to the present invention is constructed as described above, and approximately half or 1/3 of the blade length is formed on the tapered surface which becomes narrower toward the center of the tip, and the tapered surface p and the one following it. Since the spiral groove 2 is engraved on the partial blade surface m, the introduction into the processing hole is guided to the spiral groove 2 to be performed smoothly, and the spiral groove 2 is formed on the blade surface m following the tapered surface p 1. Since it is also engraved in part, it has the effect that the cutting resistance can be progressively reduced during cutting of the machining hole, and the fact that the number of blades is 3 or 4 means that the chip escape groove 3 is also large, so that efficient cutting can be performed as a whole, and the breakage of the blade surface is small.

Since the reamer according to the present invention has a small number of blades of three or four, it facilitates polishing for regeneration against damage to the blade surface and increases the economical efficiency. Compared with conventional products, the cost and production unit price can be reduced to less than half.

[Brief description of drawings]

FIG. 1 is a front view of a reamer according to the present invention.

FIG. 2 is a side view of the same.

[Explanation of symbols]

 1 Reamer body 2 Spiral groove p Tapered surface m Blade surface

Claims (2)

[Scope of utility model registration request] 1. The number of blades is three, and approximately half or one-third of the blade length is formed on a tapered surface which becomes narrower toward the center of the tip, and the tapered surface and a partial blade following this. Reamer featuring a spiral groove on the surface. 2. The number of blades is four, and approximately half or one-third of the blade length is formed on a tapered surface which becomes narrower toward the center of the tip, and the tapered surface and a partial blade following this. Reamer featuring a spiral groove on the surface.