JPH057353Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial Application Field" This invention relates to a bit used for drilling holes in rock, etc.

``Prior Art'' FIGS. 7 and 8 show an example of a conventional bit of this type, and reference numeral 1 in the figures indicates the bit body. The bit body 1 has a substantially cylindrical shape, and includes a head 1a for drilling into rock, etc.
It is made up of a mounting part 1b which has a smaller diameter and is attached to a rock drill.

A mounting groove 2 having a U-shaped cross section and extending radially outward from the center is formed on the distal end surface of the head 1a, and a carbide tip 3 having a pentagonal cross section is installed in this mounting groove 2. is fixed by brazing. In addition, a head 1 is provided on the outer periphery of the tip of the bit body 1.
A hollow groove 4 extending from the tip surface of a to the mounting portion 1b
is formed. A blowout hole 5 is formed in a portion of the hollowed-out groove 4 located at the head portion 1a toward the tip side of the bit body 1.

This ejection hole 5 is for ejecting pressurized air and fluid such as water toward the distal end surface of the head 1a. The ejected pressurized air and fluids such as water quickly send the crushed debris generated when drilling into rock etc. to the hollowed-out groove 4 and remove them, and also carry the crushed debris along with the crushed pieces through the hollowed-out groove 4 to the head. It is designed to flow toward the rear end of 1a.

"Problems to be Solved by the Invention" By the way, in the bit with the above configuration, when drilling into rock etc., fluid such as water spouted from the spout hole 5 toward the tip side of the head 1a, and vice versa. Head 1a
Fluid flowing from the tip side of the bit body through the chip groove 4 toward the rear end side of the bit body with the crushed debris interferes with each other within the chip body. As a result,
It is difficult for fluid such as water to flow efficiently toward the tip surface of the head 1a, and as a result, debris cannot be removed efficiently, which slows down the drilling speed.
There was a problem in that the life of the bit was also shortened because the tip end face of the bit a and the carbide tip 3 were not effectively cooled.

``Purpose of the invention'' This invention was made to solve the above-mentioned problems, and its purpose is to provide a bit that has a long life and can increase the drilling speed.

``Means for Solving Problems'' This invention provides a bit in which a hollow groove extending from the tip surface toward the rear end is formed on the outer periphery of the tip of the bit body. In the part other than the part where the above-mentioned hollowed-out groove is formed,
A jet hole for spouting fluid for removing crushed debris and cooling is formed toward the tip side of the bit body, and a guide groove is formed extending from the jet hole to the front end surface of the bit body.

"Embodiment" Figures 1 and 2 are diagrams showing the first embodiment of this invention, and the components shown in these figures are the seventh embodiment.
Components that are the same as those shown in the figures and FIG.

The bit shown in FIGS. 1 and 2 differs from the bit shown in FIGS. 7 and 8 in that the bit body 1 has a part other than the part on the outer periphery of the head 1a where the powder groove 4 is formed. a nozzle 10 and a nozzle 1
Pressurized air and fluid such as water ejected from head 1
This is because a guide groove 11 is formed on the distal end surface of a.

That is, a guide groove 11 is provided at a position spaced apart from the center of the head 1a in the axial direction by approximately 1/4 of a circumference in the circumferential direction from the location where the hollow groove 4 is formed on the outer periphery of the head 1a. It is formed so as to extend to the distal end surface of. At the rear end of this guide groove 11, an ejection hole 10 is bored toward the tip side of the bit body 1.

Next, the operation of the bit configured as described above will be explained. That is, the bit is rotated or slid in the axial direction to blow out a fluid such as pressurized air and water from the spout hole 10 while drilling a rock or the like. Then, this ejected fluid flows into the guide groove 11.
and is supplied to the distal end surface of the head 1a. At this time, the pressure near the tip surface of the head 1a of the guide groove 11 is relatively higher than that near the chip groove 4, so
The crushed debris crushed by the carbide tip 3 is placed in the guide groove 11.
The powder groove 4 along with the above fluid does not flow into the powder groove 4.
flow to and be removed. Further, the distal end surface of the head 1a and the carbide tip 3 are cooled by this fluid.

According to the bit having the above configuration, the guide groove 11 is formed in a portion of the head 1a other than the part where the hollowed-out groove 4 is formed, and the ejection hole 10 is formed at the lower end of this guide groove 11. Fluid such as pressurized air and water is supplied to the tip surface of the head 1a through the guide groove 11 to flow the crushed debris into the hollowed-out groove 4, unlike the conventional method. Like the one in which holes 5 are formed, the fluid flow does not interfere in the cutting groove 4, and the head 1 is efficiently
Flows toward the tip surface of a. Therefore, since crushed debris is efficiently removed, the drilling speed can be increased, and the tip surface of the head 1a and the carbide tip 3 can be efficiently cooled, increasing the life of the bit. can be done.

3 and 4 are diagrams showing a second embodiment of this invention, in which this invention is applied to a car bit.

In the figure, numeral 20 is the bit body, numeral 20
a and 20b indicate a head and a mounting portion, respectively. A carbide chip 2 with a pentagonal cross section is provided on the tip surface of the head 20a.
1 is provided in the form of a single character. Further, a hollow groove 22 having a substantially arcuate cross section is formed on the outer peripheral portion of the tip of the bit body 20, extending from the tip surface of the head 20a to the mounting portion 20b. Also, this chestnut groove 2
On the outer periphery of the head 20a adjacent to the head 20a
A guide groove 23 is formed that extends from the center in the axial direction to the distal end surface of the head 20a. A spout hole 24 is provided at the lower end of this guide groove 23 so that the bit body 2
It is formed with the tip side of 0 facing.

Then, fluid such as water ejected from the ejection hole 24 is transmitted through the guide groove 23 and ejected onto the tip surface of the head 20a, and debris generated when drilling a rock etc. is quickly sent to the hollow groove 22. At the same time, the tip surface of the head 20a and the carbide tip 21 are cooled.

5 and 6 are diagrams showing a third embodiment of this invention, in which this invention is applied to a lock bit. In these figures, numeral 30 indicates the bit body. This bit body 30 is approximately cylindrical, and its tip 30a is formed so that its diameter becomes larger toward the tip, and a spherical carbide tip 31 is implanted on this tip surface. has been done. Further, the left and right side surfaces of the distal end portion 30a are cut out so as to be inclined inward toward the distal end side. This cutout portion 32 serves as a hollow groove. Further, the outer circumferential portion of the tip portion 30a is arranged from the central portion of the tip portion 30a in the axial direction to the tip portion 30a.
A guide groove 33 is formed that extends to the distal end surface. A jet hole 34 is formed at the lower end of the guide groove 33 so as to face the tip side of the bit body 30.

Then, fluid such as water ejected from this spout hole 34 is transmitted through the guide groove 33 and supplied to the tip surface of the tip portion 30a, and quickly removes crushed debris generated when drilling a rock or the like from the cut-out portion. 32 for removal, and at the same time, the distal end surface of the distal end portion 30a and the carbide tip 31 are cooled.

In addition, in the above embodiment, the ejection holes 5, 24, 34
is provided only on the outer periphery of the tip of the bit body 1, 20, 30, but it may be provided on the tip surface in addition to this.

``Effect of the invention'' According to this invention, in a bit in which a hollow groove extending from the tip surface toward the rear end side is formed on the outer periphery of the tip of the bit body, the hollow groove on the outer periphery of the tip of the bit body An ejection hole for ejecting a fluid for removing crushed debris and cooling is formed toward the tip side of the bit body in a portion other than the portion where the groove is formed, and extends from the ejection hole to the tip surface of the bit body. A guide groove is formed, and fluid such as pressurized air and water is ejected from the ejection hole to the tip surface of the bit body through the guide groove, and the crushed debris is flowed into the chip groove, which is different from the conventional method. The flow of the fluid does not interfere within the cutting groove and efficiently flows toward the tip surface of the bit body. Therefore, since crushed debris is efficiently removed, the drilling speed can be increased, and the tip of the bit body can be efficiently cooled, so the life of the bit can be extended. can get.

[Brief explanation of the drawing]

1 to 6 are diagrams showing embodiments of this invention. Fig. 1 is a side view showing the bit of the first embodiment, Fig. 2 is a plan view thereof, Fig. 3 is a side view showing the bit of the second embodiment, Fig. 4 is a plan view thereof,
Fig. 5 is a side view showing the bit of the third embodiment, Fig. 6 is a plan view thereof, Fig. 7 is a side view showing an example of the conventional bit, and Fig. 8 is a plan view thereof. . 1, 20, 30... bit body, 4, 22...
Hole groove, 10, 24, 34...Blowout hole, 11,
23, 33... Guide groove.

Claims (1)

[Scope of utility model registration request] In a bit in which a die groove extending from the tip surface toward the rear end is formed on the outer circumference of the tip of the bit body, a portion of the outer circumference of the tip of the bit body other than the portion where the die groove is formed, A bit characterized in that an ejection hole for ejecting a fluid for removing crushed debris and cooling is formed toward the tip side of the bit body, and a guide groove is formed extending from the injection hole to the front end surface of the bit body. .