WO2011149143A1

WO2011149143A1 - Drill bit

Info

Publication number: WO2011149143A1
Application number: PCT/KR2010/004604
Authority: WO
Inventors: 박극우
Original assignee: 태양파워(주)
Priority date: 2010-05-24
Filing date: 2010-07-15
Publication date: 2011-12-01
Also published as: KR20110128694A

Abstract

An exemplary embodiment of the present invention relates to a drill bit mounted to the front end of a drill blade. The drill bit that is inserted and seated into a recessed groove formed in the front end of a drill blade comprises: a main tip to be inserted into the recessed groove, the main tip including a "V" shaped cutting blade formed at the front end thereof and an insertion groove formed in the bottom surface thereof in a crossing manner, facing an auxiliary tip; and the auxiliary tip to be inserted into the recessed groove, the auxiliary tip including a seat groove formed in the front end surface thereof in a crossing manner, facing the insertion groove of the main tip, wherein the main tip and the auxiliary tip are coupled in such a manner that the drill bit is connected to a lead having a helical recess formed on the outer peripheral surface of the drill blade. In this way, chips produced from a workpiece during a drilling operation are quickly discharged along the helical recess formed in the lead of the drill blade, thereby improving the work efficiency. Further, as the main and auxiliary tips of the drill bit are arranged to have a crossing angle of 98^o, it is easier to provide a rotational force in the clockwise direction during the drilling operation and the life of the drill bit is thus improved. In addition, a circular hole cross-section facilitates a firm-fit of an anchor bolt being inserted such that an operator may feel less tired and provide an improved work efficiency.

Description

Drill bit

An exemplary embodiment of the present invention relates to a drill bit mounted on the tip of a drill blade, and more particularly, to mount a drill bit combined with a main tip and an auxiliary tip to the tip of a drill blade to provide a good quality drilling operation. It is about a drill bit.

In general, the drill bit is used for the drill bit of the drill drill for drilling the anchor bolt insertion hole in the workpiece, such as concrete, asphalt, stone, etc. Many types of drill bits have been used.

The drill blade (1) applied to the initial drilling drill (9) is a conical cutting blade integrally formed at the tip of the drill drilled by directly rotating the cutting object, when the cutting blade is worn or damaged (1) ) There was a problem that needs to be replaced.

Therefore, by forming an indentation groove 1a at the tip of the drill blade 1 and separately installing a drill bit made of cemented carbide in the indentation groove, it minimizes the cost of purchasing the drill by replacing only the drill bit worn during the drilling operation. It was.

Looking at the drill blade (1) equipped with such a conventional drill bit, as shown in Figure 5 and 6, the blade portion (3) equipped with a separate cutting edge (3a) at the tip; A lead portion 5 having a spiral groove 5a for chip discharge and cutting oil supply; It consists of a bag part 7 which fits and is fixed to the drill chuck 9a of the perforation drill 9.

Looking at the operation relationship, when the drive motor mounted on the drill (9) is rotated at high speed, the drill chuck (9a) connected to the drive motor rotates the bag (7) integrally formed at one end of the drill blade (1) The cutting blade 3a attached to the tip of the drill blade 1 rotates at a high speed to drill a hole at a predetermined position of the workpiece.

However, the drill bit of the conventional embodiment shown in Figure 5 is composed of only one cutting edge (3a) mounted on the blade portion 3, it does not provide a stable rotational strike. This is because the hole cross section formed by the drilling operation does not form a garden, causing the problem that the anchor bolt is inserted into the hole during the operation is a problem that adds to the troublesome work and fatigue.

In the drill bit of another conventional embodiment shown in FIG. 6, the cutting edge 3a of the blade portion 3 is formed of the main cutting edge 3a-1 and the web cutting edge 3a-2. Since the coupling angle of the web cutting edge is formed in the form of a cross (+) of 90 °, the frictional force received from the workpiece by the centrifugal force during the high-speed rotation in the clockwise direction is maximized, so that the rotation of the web cutting blade is not provided easily. This causes a problem of shortening the life by causing wear or deformation of the drill bit itself.

In addition, since the blade portion 3 and the recess 5a of the tip are spirally connected to each other without being connected to each other, chips of the workpiece to be generated from the blade portion 3 during the drilling operation are blocked. 5) there is a problem that can not be quickly discharged along the groove (5a) formed in a spiral shape.

Exemplary embodiments of the present invention have been created to improve the problems as described above, an object of the present invention is to produce a drill bit coupled to the main tip and the auxiliary tip is connected to the lead portion is formed with a spiral groove groove work efficiency Improves and provides high quality drilling.

Another object of the present invention is to provide an easy rotation in the clockwise direction while minimizing the friction force received by the drill bit coupled to the main and secondary tips to the workpiece.

To this end, a drill bit according to an exemplary embodiment of the present invention is a drill bit inserted into and coupled to an indentation groove formed at a leading end of a drill part of a drill blade. It may include a main tip formed with a cutting edge, and an auxiliary tip inserted into the inlet groove while being coupled with the main tip.

In the drill bit, the main tip may be formed by forming an insertion groove in the lower surface to cross and correspond to the auxiliary tip.

In the drill bit, the auxiliary tip may be formed by forming a seating groove that crosses the front end corresponding to the insertion groove of the main tip.

In the drill bit, the intersection angle of the main tip and the auxiliary tip comprises 98 °.

Since these drawings are for reference in describing exemplary embodiments of the present invention, the technical idea of the present invention should not be construed as being limited to the accompanying drawings.

1 is an exploded perspective view showing a coupling relationship between a drill bit and a drill blade according to an exemplary embodiment of the present invention.

2 is an exploded perspective view and an enlarged top view of a drill bit and a drill blade according to an exemplary embodiment of the present invention.

3 is a diagram illustrating a state in which a drill bit according to an exemplary embodiment of the present invention is coupled to an indentation groove of a drill blade and fixed by soldering or welding.

Figure 4 is a plan view showing the coupling and intersection angle of the main and secondary tips of the drill bit according to an exemplary embodiment of the present invention.

Figure 5 is a front view showing a drill bit and a drill blade and a drill for drilling in an exemplary embodiment of the prior art.

Fig. 6 is a front view showing a drill bit and a drill blade according to another exemplary embodiment of the related art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to those shown in the drawings, and is shown by enlarging the thickness in order to clearly express various parts and regions. It was.

1 is an exploded perspective view illustrating a coupling relationship between a drill bit and a drill blade according to an exemplary embodiment of the present invention, and FIG. 2 is an enlarged perspective view of a coupling perspective and main parts of a drill bit and a drill blade according to an exemplary embodiment of the present invention. to be.

Referring to the drawings, the drill bit 100 of the present invention is the main tip 110 is inserted into and coupled to the inlet groove (1a) formed at the tip of the drill blade 1, and the auxiliary tip 120 cross-coupled with the main tip It consists of.

The main tip 110 and the auxiliary tip 120 is preferably formed of cemented carbide having excellent wear resistance in order to drill holes for inserting anchor bolts in concrete, asphalt, and stone.

The main tip 110 forms a cutting edge 111 of the "V" shape to provide an easy drilling operation on the tip.

In addition, the lower surface center is formed by inserting the insertion groove 112 so as to cross and correspond to the auxiliary tip (120).

The depth of the insertion groove 112 is preferably not more than 1/2 of the height of the auxiliary tip (120).

The auxiliary tip 120 corresponds to the insertion groove 112 of the main tip 110 on the front end surface to form a seating groove 121 that crosses to a predetermined depth.

The depth of the seating groove 121 preferably does not exceed the depth of the insertion groove 112 of the main tip (110).

Referring to the coupling relationship between the main tip 110 and the auxiliary tip 120 of the present invention, the insertion groove 112 formed in the center of the lower surface of the main tip to the mounting groove 121 formed on the front end surface of the auxiliary tip 120 Inserted so as to intersect, the lower surface of the main tip 110 and the auxiliary tip 120 is in close contact with the lower surface of the inlet groove (1a) formed at the tip of the lead portion 5 of the drill blade (1).

Referring to the enlarged plan view of the main part of FIG. 2, the lead part 5 in which the spiral groove 5a is formed in the longitudinal direction is formed to be connected without being interfered between the main tip 110 and the auxiliary tip 120.

Referring to FIG. 3, the main tip 110 and the auxiliary tip 120 are welded (W) with silver solder or the like in a state in which the drill tip 1 is in close contact with the lower surface of the inlet groove 1a and the main tip 110. After the secondary tip 120 is firmly welded to the inlet groove 1a of the drill blade 1, the surface is finished by plating or the like.

Referring to Figure 4, a diagram illustrating the coupling relationship between the main tip 110 and the auxiliary tip 120 of the present invention, by forming the intersection angle of the main tip 110 and the auxiliary tip 120 to 98 °, The drill bit 100 coupled to the main tip 110 and the auxiliary tip 120 of the present invention is to provide an optimized rotational force in the clockwise direction during the drilling operation.

The configuration of the main tip 110 and the auxiliary tip 120 of the present invention has been described above. Looking at the operation relationship during the drilling operation, the drill bit 100 of the present invention is positioned on the surface of the workpiece to be drilled. Then, when the high-speed rotational force is transmitted to the drill chuck 9a by the built-in motor of the drill 9 for drilling, the drill bit 100 of the present invention rotates the drill blade 1 fixed to the drill chuck to perform the drilling operation. It will be done.

In particular, since the drill bit 100 of the present invention is connected to the lead portion 5 of the drill blade 1 in which the groove 5a is formed in a spiral without interference, the chip generated in the workpiece during the drilling operation acts and reacts. In other words, the chip cut by the pumping role can be easily pulled out and discharged.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. In addition, it is natural that it belongs to the scope of the present invention.

According to the drill bit according to the exemplary embodiment of the present invention as described above, by manufacturing a drill bit combined with the main tip and the auxiliary tip to be connected to the lead portion is formed with a spiral groove on the outer peripheral surface of the drill blade, cutting during drilling There is an advantage of providing improved work efficiency by quickly discharging the chip generated in the water along the spiral groove formed in the drill blade lead.

In addition, since the intersecting angle between the main tip and the auxiliary tip of the drill bit forms 98 °, it provides an easy rotational force in the clockwise direction during drilling, and improves the life of the drill bit. Since the anchor bolt is firmly drawn in, there is an advantage of reducing the worker's work fatigue and providing improved workability.

Claims

In the drill bit that is inserted into the inlet groove formed at the tip of the lead portion of the drill blade to engage,

A main tip inserted into the inner groove and coupled to a tip thereof, wherein a cutting edge having a “V” shape is formed at the front end thereof; And

An auxiliary tip intersecting with the main tip to be inserted into and coupled to the inlet groove; Drill bit comprising a.
The method of claim 1,

The main tip is a drill bit, characterized in that to form an insertion groove intersect with the sub-tip corresponding to the lower surface.
The method according to claim 1 or 2,

The auxiliary tip is a drill bit, characterized in that the front end to form a seating groove to cross while corresponding to the insertion groove of the main tip.
The method of claim 1,

A drill bit, characterized in that the intersection angle of the main tip and the auxiliary tip is 98 °.