KR20190083215A - A drill instrument combined with a drill tip of insertion and centerfixing type - Google Patents

Abstract

In a conventional drill tool constituted by a fixed body formed with a fixing surface, a pair of chip discharge grooves and a cutting oil supply hole, a groove formed with a latching protrusion horizontally crossing the upper end of the drill body is formed, The drill bit is inserted into the center of the bottom of the columnar fixed body through the through hole passing through the center of the upper end of the drill body, To a drill tool having an insertion center fixed type drill tip to which a fixing groove formed in a fixed center is fixed.

Description

Technical Field [0001] The present invention relates to a drill tool having a drill tip,

The present invention relates to a drill tool combined with an insert and a center fixed drill tip, and more particularly to a drill tool comprising a fixed body on which a fixing surface is formed, a pair of chip discharge grooves, and a drill body formed with a coolant supply hole The drill body is formed with a groove having a stopper horizontally crossing the upper end of the drill body. A fixing groove is formed at the center of the bottom surface of the groove, and a drill tip having a stopper is inserted. And a fixation groove formed at a central portion of the bottom surface of the drill tip is fixed by fixing means inserted through a through hole passing through the center of the drill body at the center of the drill body.

Generally, a drill tool is used to obtain a circular hole or groove in a work piece made of metal, plastic, wood, stone, or other material. In the configuration, a drill body having a cutting edge integrally formed at an upper end thereof This is because it is very uneconomical because the cutting tool is replaced or the blade is re-polished when the cutting edge is worn or damaged. In case of regenerating, it is difficult to work, time consuming and costly there was.

[0003] As a conventional tool of the above-mentioned type, a technical structure relating to a "drill main body" is disclosed in Korean Patent Publication No. 10-2009-117689, The drill body formed integrally with the drill body is severely worn or damaged. If the drill body is worn or damaged, the entire drill body must be discarded and the entire structure of the complex structure formed at the tip of the drill body should be re- As a result, it takes a lot of time and effort to waste the material, thus losing its competitiveness.

As another conventional technique of the above-described integral type, a technical content of a "drill tool for forming a hole in a metal workpiece" is disclosed in Korean Patent Laid-Open Publication No. 10-2005-3469, And a cutting insert having two cutting inserts formed at the tip of the shaft. In a structure similar to that of the conventional example, when the cutting insert of the drill tool is severely damaged or worn, the cutting insert and the shaft are integrally formed You must destroy the whole.

As a result of the above problems, drill tools having a single drill tip (cutting tip) or two line-symmetrical drill tips coupled to the drill body tip by various types of fastening means have been developed and widely used.

As a prior art example of a drill tool in the form of a detachable drill body at the tip of the drill body, a drill tool filed in Korean Patent Application No. 10-2001-18542 is capable of replacing the cutting tip and cutting the cutting chip to reduce the rotary cutting load It is able to drill at one time without drilling step by step with limited power, and it is also possible to reduce the amount of frictional load generated when chip is discharged by cutting and discharging chips, and cutting speed is fast but it is composed of sawtooth cutting tip, Since it is thick and rod-shaped, there is a risk of injuring the operator during chip discharge. The depth of drilling is limited due to frictional resistance, and the tilting phenomenon is generated to limit the length of the drill tool. The dimensional stability of the perforated hole deteriorates.

As another example, a registered patent publication (Registration No. 10-2005-540630) discloses a technique related to "a drill tool composed of a combined cutting tip having a cutting edge formed in a concavo-convex shape" And the blade is formed with a plurality of concave-and-convex cutting tips which are formed by repeating successions of the concave portion and the protruding portion, respectively, downwardly sloping in a mutually corresponding direction from one vertex, and a vertically fixed surface is formed at the tip of the drill body of the drill body for fixing the cutting tip The present invention relates to a drill tool comprising a drill body having a discharge groove on a circumferential surface of a body and a detachable drill tip in which a cutting edge is divided into a plurality of segments.

The cutting tool as described above allows the cutting edge to be formed alternately with the protruding portion and the recessed portion, so that the load required for rotary cutting of the cutting edge is dispersed so that the rotation load is greatly reduced and the chips generated by the rotary cutting for the perforation are thinly cut It is a drill tool designed to reduce the friction load generated between the chip discharge groove formed in the drill tool body and the wall surface of the perforated hole, to drill the hole deeply, and to secure the dimensional stability. However, It is very difficult to drill a drill tip made of high-strength tungsten carbide, to form a helix in a hole, or to form a helix of a screw because the means of joining to the end of the drill body is combined with a small screw. Even if screws are inserted and fastened, the The screw is broken and the screw thread is loosened. As a result, the drill tip is fine in the right position, but the dimension stability can not be secured due to the lateral movement and the pushing, and the excessive force There is a problem that the durability of the drill tip is shortened.

The present invention relates to a drill tool which is combined with a separate cutting tip in a domestic registered patent publication (Registration No. 1142426) as a prior art, wherein two detachable cutting tips detachable by screws on the front end of the drill tool body are diagonally line- The present invention relates to a drill tool having an inclined surface inclined downwardly to both sides and having a plurality of protrusions formed on the inclined surface alternately with a cutting edge and grooves formed alternately, It is a drill tool with the same problems as combined drill tools.

1. Korean Patent Application No. 10-2001-18542 2. Korean Patent Publication No. 10-2005-3469 3. Korean Patent Publication No. 2005-540630 4. Korean Patent Publication No. 2009-117699 5. Korean Registered Patent Publication No. 2012-1142426

The present invention is an invention improved and supplemented with the problems of the drill tool described in the prior art (Japanese Patent No. 540603) and the registered patent publication (No. 1142426) filed by the present applicant, Improved means of fastening and fixing the drill tip to the drill body Easy and stable and precise fixation of the center makes it possible to prevent the blurring and to secure the dimensional stability and reduce the load of the drill tip, Improving the inclination to the bottom surface and cutting the cutting chips into flakes reduces the load on the drill tip and reduces the cutting angle downward from the apex of the drill tip (drilling angle) And the tip of the drill body formed at the front surface of the cutting edge is inclined so that the chip discharge load is greatly reduced To provide an insert, so that can extend the life of the drilling tool including a drill tip and the center stand stationary drilling tool has a purpose.

According to the present invention, the upper part of the drill body horizontally passes through the center of the drill body, and the upper part forms a space part with the vertical walls on both sides, and the vertical walls and the lower part of both sides form the space part of the semicircular body, And a drill tip insertion groove having a locking protrusion formed thereon is formed.

The drill tip inserted into the insertion groove formed in the upper end of the drill body is formed with a semicircular main surface having a bottom surface, a fixing groove formed at the center of the bottom surface of the semicircular main surface and an upper portion of the drill tip extending inwardly from an upper surface of the semicircular main body, The drill tool according to claim 1,

The means for fixing the fixing groove includes a ball bearing, a circular rod having a columnar pedestal, a circular rod seat having a groove formed on a circumferential surface thereof, And a bolt having a polygonal through-hole in the order of a bolt, a polygon screwdriver, and a bolt to be fixed to the fixing groove.

Further, in order to reduce the cutting and discharging load, the cutting edge of the drill tip is divided into a plurality of grooves, and the left and right cutting edges are staggered with respect to the center vertex of the integral cutting tip, And the angle of forming the bottom surface and the horizontal surface of the cutting edge is reduced to cut the thickness of the chip into a thin film so as to reduce the cutting and discharging load and to increase the number of revolutions and to drastically drill the drill. It is a tool.

Further, around the insertion groove formed in the upper end portion of the drill body, a solid support wall of a thick portion is formed on the back surface of the left groove at the center of the insertion groove, and an inclined surface of the thin portion is formed at the front to connect to the discharge groove at the front, And the discharge chip can be smoothly discharged by being connected to the discharge groove on the rear side of the thin wall portion.

"형으로 된 걸림턱을 구비한 삽입홈이 형성되어 있어 이 홈에 일치 밀착되는 저면 중심에 고정홈을 구비한 드릴팁이 삽입되며 드릴팁이 삽입된 상태에서 고정부 몸체 저면 중심에서 드릴 몸체 상단 중심을 관통하는 관통공을 통하여 삽입되는 고정수단으로 드릴팁의 저면 중심에 형성된 고정홈을 강력하게 고정시키며 드릴팁의 절삭날 저면과 수평면이 형성하는 각도와 절삭날의 하향 경사각을 줄이므로서 절삭팁의 부하량과 칩 배출 부하량을 크게 줄일 수 있는 삽입 및 중심 고정형 드릴팁이 결합 된 드릴 공구라 할 수 있다.The overall configuration of the drill tool having the partial features as described above is characterized in that the drill body has a cylindrical circumferential fixed body formed with a fixing surface and two sets of discharge grooves on the circumferential surface of the drill body smaller than the diameter of the fixed body, In a conventional drill tool in which a cutting oil hole is formed and the drill tip is engaged,

And a drill tip having a fixing groove is inserted in the center of the bottom surface which is in close contact with the groove, and in the state where the drill tip is inserted, Since the fixing groove formed at the center of the bottom of the drill tip is strongly fixed by the fixing means inserted through the through hole passing through the center, the angle formed between the bottom surface and the horizontal surface of the cutting edge of the drill tip and the downward inclination angle of the cutting edge are reduced, A drill tool that combines an insert and a center-fixed drill tip that can significantly reduce tip loading and chip discharge loading.

Since the present invention improves the means for fixing the drill tip to the drill body, it is possible to secure the dimensional stability of the cutting hole by reducing the burden of the drill tip by preventing the tilting phenomenon by fixing the center easily and stably The drill tip is cut into slices by cutting the cutting tip into a thin piece to reduce the load of the drill tip and reduce the drilling angle of the drill tip so as to reduce the discharge load of the cutting tip, It is an insert and center fixed drill tool that can significantly extend the life of the drill tool, including the tip.

Figure 1 is a perspective view of a drill tool incorporating the drill tip of the present invention.
2 is a perspective view of a drill tip insertion groove according to the present invention.
Figure 3 is a perspective view of the drill tip of the present invention.
4 is an exploded perspective view of a fastening means for fastening the drill-
5 is a cross-sectional view of the cutting tip vertically bisected in the width direction at the center vertex of the cutting tip in a state where the drill tip is engaged and fixed
6 is a cross-sectional view of the cutting tip perpendicularly bisected longitudinally at the center of the cutting tip in a state where the drill tip is engaged and fixed

The present invention can easily and easily attach and detach a drill tip, firmly fix a drill tip, and precisely and firmly fix the center of the drill tip to prevent a blurring phenomenon, thereby ensuring dimensional stability of a cutting hole, Improves the durability of drill tools including drill tips, because it can skip the drilling work in the work center and is easy to work with deep holes (over 10D) and reduces the cutting load of the drill tip and the load of chip discharge. The drill bit can be drilled in the drill body with a smaller diameter than that of the fixed body. The drill bit of the drill bit can be moved from the lower side to the upper side along the circumference of the drill body. Two sets of chip discharge grooves formed by twisting the wheels are formed, and at the upper end of the drill body, In a conventional drill tool in which a supply hole is formed and to which a screw detachable drill tip is attached

A drill body is formed at an upper end of the drill body with a drill tip 6 inserted horizontally across the center of the upper end of the drill body and a lower half of the drill tip 7 is closely fitted and fixed to the drill tip insert groove 6, A thick wall supporting wall 12 is formed behind the left groove at the center of the insertion groove and a sloped surface 13 of a thin portion is formed at the front of the left groove to be connected to the chip discharge groove 4 formed at the front side, A support wall 12 is formed on the front side of the groove and an inclined surface 13 of the thin wall is formed on the rear side of the groove so as to be connected to another chip discharge groove 4 formed on the rear side, And the fixing groove 8 is fixed by a fixing means inserted through a through hole passing through the center of the upper end of the drill body at the bottom center of the columnar fixed holding body, drill It relates to a combined drilling tool (see Fig. 1, 2, 3)

The drill tip insertion groove (6) formed horizontally across the upper end of the drill body (3) has an upper portion formed with a space portion on both side vertical walls and a lower portion formed with a space portion of the semicircular main body, And a drill tip 7 insertion groove 6 formed at the center of the bottom of the insertion groove for forming a through hole 9b passing through the center of the upper end of the drill body at the center of the fixed body 1 ) (See Figs. 1, 2, and 4)

The drill tip (7) inserted into the insertion groove (6) has a bottom surface formed with a semicircular main surface, a fixing groove (8) formed at the center of the bottom surface of the semicircular main surface, A drill tip 7 which extends to the center apex of the tip 7 and in which a drill tip stop 11 is formed between the semicircular main body and the body (see Figure 3)

When the drill tip 7 is inserted into the insertion groove 6, the lower portion of the drill tip 7 is inserted and supported by the front and rear walls formed before and after the inserted drill tip, The drill-tip stopper 11 formed on the drill-tip end of the drill-tip end is engaged with and supported by the insertion-hole-locking protuberance so that the tip of the drill- It is possible to reduce the noise by preventing the fine movement of the drill tip to prevent the tilting phenomenon and to easily disassemble and disassemble the drill tip, to ensure accurate centering and dimensional stability at the start of drilling, .

The fixing means 9 for fixing the fixing groove 8 formed at the center of the drill tip bottom face portion includes two through holes 9a passing through the center of the bottom of the fixed body 1 and passing through the center of the drill body 3, A circular bar 9f having a ball bearing 9d and a columnar pedestal 9e is formed through a through hole 9a in which a spiral 9c of the through hole 9b is formed and a circular shape having a plurality of grooves 9g formed on the outer surface thereof. A rod seating hole 9h and a fixing means 9 having a spiral formed on the outer surface thereof and a bolt 9k having a polygonal through hole 9j formed on the inner side thereof in the order of a bolt 9k and a polygonal screw driver 9l (See Figs. 4, 5 and 6)

The function and the function of the fixing means 9 are inserted in the order of the ball bearing 9d, the circular rod 9f, the circular rod seating hole 9h and the bolt 9g through the penetrating air hole 9a of the fixing means, The screw 9c reaches the end of the small hole 9b and comes into contact with the drill tip fixing groove formed in the bottom surface of the drill tip inserted into the drill tip insertion groove 6. When the bolt is started to be tightened by the polygon screw driver 9l, The drill tip fixing groove 8 formed on the bottom surface of the tip is closely contacted to strongly fix the drill tip.

In addition, as for the insertion of the drill tip and the construction around the upper end of the drill body 3 supporting the drill body 3, the drill tip insertion groove 6 is formed in the radial direction of the drill body 3, A slant surface 13 of a thinner portion is formed in front of the rotation advancing direction and is connected to a chip discharge groove 4 formed at the front side and a rotation advancing direction of the right groove at the center of the insertion groove A strong thick-walled support wall 12 is formed on the rear side of the chip discharge groove 4, and a sloped surface of the thin-walled portion is formed in front of the rotationally progressing direction to be connected to the chip discharge groove 4 (Figs. 2 and 3 Reference)

In such a configuration, the drill tip having the lower portion of the drill tip inserted into the insertion groove and the remaining upper half portion of the drill tip extending in the vertical direction is subjected to a strong resistance during the cutting operation, so that a strong thick wall support wall 12 And the inclined surface 13 is formed on the front surface of the drill tip so as not to receive the resistance due to the upward movement of the cutting edge due to the cutting edge and connected to the chip discharge groove 4 to discharge the chip, .

In addition, as described above, the drill tip 7 has a structure in which the bottom surface is semicircular main body, the drill tip fixing groove 8 is formed in the center of the bottom of the semicircular main body, and the rectangular body extends in the vertical direction The drill tip 11 is formed and the elongated upper body is slid downwardly in opposite directions with respect to the apex 14 of the center of the drill tip so that the partial cutting edge 16 of the left and right drill tips The recessed grooves 15 are alternately formed and a cutting edge downward inclination angle downward from the center vertex of the cutting edge to both right and left sides and a cutting edge and bottom inclination angle 19 formed by the partial cutting edge 16 and the bottom face 17 are minimized (Refer to FIG. 3)

In the drill tip, the cutting edges of the left and right cutting tips with reference to the vertices of the integral cutting tips are divided into a plurality of pieces by the recessed grooves 15, and the cutting ground plane of the left divided cutting edge and the right- By cutting off the cutting ground plane of the divided cutting edge, the left partial cutting edge is cut and left, the right partial cutting edge is cut, the width of the cutting chip is narrowed, and the inclination of the bottom edge of the cutting edge is reduced, It is possible to cut the thickness of the chip (cutting piece) into thin pieces to reduce the receiving load of the drill tip.

In addition, by making the inclination angle from the apex to the left and right sides gentle, the cutting direction of the cutting chip is raised substantially in the vertical direction, so that the inclined surface of the upper part of the drill body is connected to the passing chip discharge groove, .

If the cutting edge bottom inclination angle 18 formed with the imaginary horizontal plane of the cutting edge is 5 ° C or less, the chip can be smoothly discharged. If the cutting edge starts to become larger than 5 ° C, The load to be received becomes larger.

The downward inclination angle (inclined angle) 19 of the right and left drill tip cutting edges at the center of the drill tip may be in a suitable range of 10 ° C or lower, and the downward inclination angle of the right and left cutting edges at the apex of the drill tip is 10 ° C or more The chip is not straightened and gradually gets closer to the horizontal direction, so that the chips are integrated in the inside and are put together between the drill body and the perforated hole to increase the rotational load and eventually stop the operation .

In addition, the bottom of the drill tip is semicircular rather than perpendicular, so that the force that supports the drill tip is strong. In order to prevent cracks that may occur at the right corner, it is made semicircular so that the force concentrated on the corner is dispersed, The tip will have a stronger force.

In addition, the bottom of the drill tip has a fixed R (semicircular) and a fixing groove formed at the center of the bottom at an angle of 90 ° so that it can be stably placed on both sides of the body. .

1: Fixing body 2: Fixing surface
3: Drill body 4: Chip discharge groove
5: Coolant supply hole 6: Drill tip insert groove
7: Drill tip 8: Drill tip fixing groove
9: fixing means 9a: penetrating air
9b: Through-hole piercing 9c: Spiral
9d: Ball bearing 9e: Cylindrical pedestal
9f: Circular rod 9g: Multiple grooves
9h: Circular rod seat 9i: Spiral
9j: Polygon through hole 9k: Bolt
9l: Polygon driver 10: Insert jaw chin
11: Drill tip jaw chin 12: Support wall of the neck
13: slope of thin meat 14: central peak
15: concave groove 16: cutting edge
17: bottom edge of the cutting edge 18: bottom edge inclination angle of the cutting edge
19: Cutting edge downward inclination angle

Claims (8)

A drill body is formed at an upper end of the drill body with a drill tip 6 inserted horizontally across the center of the upper end of the drill body and a lower half of the drill tip 7 is closely fitted and fixed to the drill tip insert groove 6, A thick wall supporting wall 12 is formed behind the left groove at the center of the insertion groove and a sloped surface 13 of a thin portion is formed at the front of the left groove to be connected to the chip discharge groove 4 formed at the front side, A support wall 12 is formed on the front side of the groove and an inclined surface 13 of the thin wall is formed on the rear side of the groove so as to be connected to another chip discharge groove 4 formed on the rear side, And the fixing groove 8 is fixed by a fixing means inserted through a through hole passing through the center of the upper end of the drill body at the bottom center of the columnar fixed holding body, drill The combined drilling tool The drill-tip insertion groove (6) according to claim 1, wherein the upper portion forms a space portion with both side vertical walls and the lower portion forms a space portion of the semicircular main body,

(10) is formed between the space portion formed by the vertical walls on both sides and the semicircular main body space portion, and at the center of the bottom surface of the insertion groove, the center of the upper end of the drill body And a drill tip insertion groove (6) formed with a through hole (9b) passing through the center hole The drill tip (7) according to claim 1, wherein the drill tip (7) has a semicircle main body with a drill tip fixing groove (8) formed at the bottom center of the semicircular main body and a rectangular body extending vertically inside the plane of the semicircular main body And the elongated upper body is formed with the lower cutting edge 16 and the recessed groove 15 with the left and right drill tips inclining downwardly in opposite directions with respect to the drill tip center point 14, Wherein the drill tip is formed by alternately forming a cutting edge downward inclination angle (18) and a cutting edge bottom inclination angle (19) downward from the center vertex (14) to the left and right sides. tool The drill tool according to claim 3, wherein the cutting edge bottom inclination angle (18) is 5 DEG or less. A drill tool according to claim 3, characterized in that the cutting edge downward inclination angle (19) is less than 10 degrees. The drill tool according to claim 1, wherein the bottom surface of the drill tip is made of a right R type (semicircular) rather than a right angle. The drill tool according to claim 1, wherein the fixing groove (8) formed at the center of the bottom surface of the drill tip is a fixing groove formed at an angle of 90 ° with both cutting surfaces being symmetrically formed. The fixing means (9) for fixing the fixing groove (8) according to claim 1, wherein the fixing means (9) for fixing the fixing groove (8) comprises two through holes (9a) passing through the center of the bottom of the columnar fixed - A circular rod 9f having a ball bearing 9d and a columnar pedestal 9e and a plurality of grooves 9g formed on the outer surface thereof through a through hole 9a formed with a spiral 9c of the small hole 9b, And a bolt 9k having a polygonal through hole 9j formed therein is inserted in this order and then tightened by a polygon driver 9l so that the ball bearing 9d is inserted into the small hole 9d, Is a fixing means for fixing the fixing groove (8) by being positioned at the tip of a drill tool

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