JPH0512021U - Drilling tool - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents seizure of the 3 parts of the guide pad during high-speed cutting. [Structure] In a drilling tool composed of a pipe body 1 and a blade body 2, a blade body 2 is provided with a guide pad 3 and a flute groove 4. A cutting edge tip 6 is provided on a horizontal surface 5 of a flute groove 4 formed in the cutting edge body 2, and a supply hole 7 which is a blind hole at the tip is provided in the axial direction. The supply hole 7 is provided with a branch hole 8 that opens rearward of the upright surface 10 that constitutes the flute groove 4, and a branch hole 9 is provided between the guide pads 3 and between the guide pad 3 and the cutting edge tip 6. It is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drilling tool such as a gun reamer, which is improved in particular to reduce seizure during drilling.

[0002]

[Prior Art]

 Conventionally, in this type of gun reamer, as disclosed in, for example, Japanese Utility Model Application Laid-Open No. 60-80808, one in which a cutting oil supply hole is branched behind a standing surface forming a flute groove is known. .

[0003]

[Problems to be solved by the device]

 However, when high speed cutting of 100 m / min or more is performed with a gun reamer or the like as disclosed in the above publication, the guide pad portion of the cutting edge body becomes poor in lubricity and coolness due to cutting oil, and as a result, the guide pad portion is burned. There was a problem that sticking occurred.

In view of the above, the present invention seeks to provide a drilling tool in which seizure of the guide pad portion is reduced.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of the above-mentioned points, and a cutting oil supply hole is formed in the cutting edge body so as to be a blind hole at the tip, and a branch hole from this point is formed. is there. In this case, the branch hole exists between the upright surface and the guide pad behind the flute groove or between the guide pad and the cutting edge tip.

[0006]

[Action]

 The drilling tool of the present invention has a function of supplying cutting oil from the branch holes provided between the guide pads or between the guide pads and the cutting edge tips. Therefore, the lubricity and cooling of the guide pad portion are maintained, and the seizure of the guide pad portion is reduced.

[0007]

【Example】

 An embodiment of the drilling tool of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a pipe body, and a cutting edge body 2 made of cemented carbide is brazed to one end thereof. The cutting edge body 2 is formed with a guide pad 3 and a flute groove 4, and a horizontal surface 5 forming the flute groove 4 is provided with a cutting edge tip 6 made of an ultra-high pressure sintered body.

The cutting edge body 2 is provided with a cutting oil supply hole 7 extending in the axial direction so as to be a blind hole at the tip, and branch holes 8 and 9 are provided from the supply hole 7. Has been. One branch hole 8 is opened behind the upright surface 10 forming the flute groove 4, and the other branch hole 9 is provided between the guide pads 3 or between the guide pad 3 and the cutting edge tip 6. It is a thing.

The drilling tool of the present invention thus constructed was tested in comparison with the conventional product, and its effectiveness was confirmed as shown in FIG. In this case, the tool specifications are that the cutting edge diameter is φ6 mm, the work material is FC30, and the cutting conditions are cutting speed V = 170 m / min and feed f = 0.06 mm / rev. As a result, the product of the present invention could be further processed after 300 holes were processed, whereas the conventional product had a problem of being broken due to seizure of the guide pad 3 portion. In the conventional product, the branch holes 9 are not formed between the guide pads 3 and between the guide pads 3 and the cutting blade tips 6.

[0011]

[Effect of the device]

 As described above, the present invention has branch holes 8 and 9 formed in the supply hole 7 of the cutting edge body 2, respectively. Therefore, the present invention is applicable to high-speed cutting of 100 m / min or more. However, sufficient lubricity and cooling of the guide pad 3 are ensured. As a result, the drilling tool of the present invention has the advantage that seizure is less likely to occur in the guide pad 3 portion and the tool life can be extended accordingly.

[Brief description of drawings]

FIG. 1 is a partial front view showing an embodiment of a drilling tool of the present invention.

FIG. 2 is an enlarged side view.

FIG. 3 is an explanatory diagram showing test results of the present invention product and the conventional product.

[Explanation of symbols]

 1 Pipe Main Body 2 Blade Edge Main Body 3 Guide Pad 4 Flute Groove 5 Horizontal Surface 6 Cutting Blade Tip 7 Supply Hole 8 Branch Hole 9 Branch Hole 10 Standing Surface

Continued Front Page (72) Hideo Tsuzaka, Inventor Hideo Tsuzaka, 1-7 Tsukagoshi, Sachi-ku, Kawasaki-shi, Kanagawa Toshiba Tungaloy Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A guide pad 3 and a cutting edge body 2 having a flute groove 4 are attached to one end of a pipe body 1, and a horizontal surface 5 forming the flute groove 4 has a cutting surface made of an ultra-high pressure sintered body. In the drilling tool provided with the blade tip 6, the cutting edge body 2 is formed such that the cutting oil supply hole 7 extending in the axial direction becomes a blind hole at the tip, and is provided behind the flute groove 4. A branch hole 8 is perforated in a certain upright surface 9, and the branch hole 9 is opened at least between the guide pads 3 or between the guide pad 3 and the cutting edge tip 6. tool.