JPH11114714A - Drilling part cooling method of rotary drilling bit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure an effective cooling method in the drilling part of a rotary drilling bit and also to make improvements in service life and drilling speed. SOLUTION: This rotary drilling bit's drilling part cooling method is so constituted that a communicating hole 1 ranging from a rear end to the tip part is installed in the inner part of a rotary drilling bit, and a coolant is made to flow in from the rear end, or pressed-in, and then it is made to flow out of an optional position of the rotary drilling bit, or sprayed out, thereby cooling a drilling part of this rotary drilling bit. Likewise, this drilling bit is attached to a tip of a wet-type drill system on the market, and it pours the coolant from a cooling water exhaust nozzle of this wet-type drill system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill bit for making a hole in concrete in an aseismic reinforcement work of a reinforced concrete building, an air conditioner, a duct and the like, and a pipe and the like.

[0002]

2. Description of the Related Art It has been known that a rotary drill bit has a reduced drilling capacity or a reduced life of the bit due to frictional heat generated when drilling concrete. The current method of cooling bits for rotary drills has been to cool by pouring tap water around the perforated hole.However, the cooling liquid does not reach the perforated part, and it is not possible to obtain a sufficient cooling effect. It is.

[0003]

As described in the prior art, in the current drilling method, the method for cooling the rotary drill bit is not limited to a method of pouring tap water from around the drilled hole. The present situation is that there is no cooling liquid supply method.

[0004]

As shown in FIG. 1, an inner through-hole 1 is provided at the center of a drill bit for rotation, which communicates from a rear end to a front end, and a coolant is supplied from the rear end.
More outflow and cooling.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, a rotary drill bit shown in FIG. 1 is attached to a tip of a currently available wet drill system, and a coolant is discharged from a coolant drilling date of the wet drill system. Thereby, the cooling liquid can flow out from the tip of the rotary drill bit and be cooled.

[Brief description of the drawings]

FIG. 1 is a plan view showing a rotary drill bit.

FIG. 2 is a plan view showing a rotary drill bit attached to a wet drill system.

[Explanation of symbols]

 1. Internal bore 2. Tip opening 3. Wet drill system

Claims (1)

[Claims] 1. A method of cooling a drill bit for a rotary drill bit, wherein an inner hole is provided in the rotary drill bit, a liquid is supplied from an opening at the rear of the rotary drill bit, and flows out or jets into the drill hole.