KR900001723B1 - Grinding tool for drill point - Google Patents

Abstract

A drill grinding apparatus is provided for obtaining correct point angles and clearance angles of a drill. The drill is held in and removed from a holding means (A), and a grinding wheel (31) is positioned in a case (2). A grinding guide means (4) adjustable its angle by a hinge member allows the drill points of the drill to be contacted with the surface of the grinding wheel. A grinding means (A) adjusts the projected length of the drill from the holding means to conform with the grinding length of the grinding guide means by means of a drill fixture and guide members.

Description

Grinding tool at the end of drill

1 is a side cross-sectional view for showing the overall configuration of the present invention.

Figure 2 is a perspective view of the chuck of the drill holder means that is the main part of the present invention.

3 is an exploded cross-sectional view of the drill holder means which is the main part of the present invention.

4a, 4b is a side view and a cross-sectional view taken along line A-A of the grinding guide means which is another main part of the present invention.

5 is a state of coupling of the drill holder means and the grinding guide means.

6 is an exploded perspective view of extracting the drill guide member and the fixing member of the protrusion length adjusting means, which is another main part of the present invention.

7a and 7b are a plan view of the operating state of FIG.

8a and 8b are drill projection length adjustment states using the projection length adjustment means.

9 is an excerpt of the cutting edge of a conventional drill.

10 is an example of a conventional grinding method.

* Explanation of symbols for main parts of the drawings

1: drill 2: case

21: cutting space 22: incision

24: guide protrusion 25: protruding jaw

3: grinding means 31: grinding wheel

32: shaft 33: bearing

34: motor 4: grinding guide means

41: guide body 42: hole

43: support bracket 44: arc-shaped protrusion

45: grinding guide portion 5: protrusion length adjusting means

51: guide member 511, 511 ': guide body

512, 512 ': Incision groove 513, 513': First space

514, 514 ': second space 52: drill holding member

521, 521 ': Slider 522, 522': Drill through hole

523, 523 ': Pressing part 61: Insertion body

611 an enlarged hole 612 step

613: reduction hole portion 614: tapered portion

615: flange 616: protrusion

617: chamfer 62: chuck

621: drill through hole 622, 632 ': threaded portion

623: elastic holding piece 624: hook

63: fastener 631: knob

A: Holder means B: Grinding device

The present invention relates to a grinding tool of a drill point (Drill Point), a grinding wheel (Grinding Wheel) in one body is a grinding device provided with a grinding guide means and a protrusion length adjustment means on one side, and a separate, By providing the holder means for the drill drill to be ground, it is possible to provide an entirely new type of grinding tool that can perform the grinding work of the drill tip more quickly and accurately.

The present invention is to provide a grinding tool that is very easy to carry and use, especially with a compact and lighter weight having a complex function as described above.

It is well known in the art that a drill is combined with a drilling machine to rotate at a high speed to drill a work piece using a cutting edge of a tip. The cutting edge portion of the drill tip has a point angle of a predetermined angle indicated by θ ₁ in FIG. 9, a blade clearance represented by θ ₂ , and a helix angle. In particular, the blade tip angle is variable depending on the nature of the material to be processed bar soft materials such as marble is used in the range of 80-90 ℃, 118 ° for general materials, 130 ° for hard materials, accordingly The blade clearance is also used in a variable setting within the range of 8-12 ° and the groove spiral angle 20-32 °.

In addition, the drill once processed the material to be cut will not be able to function as the cutting edge portion of the tip is damaged wear, it can be reused only by restoring the blade edge and the blade edge angle by grinding the blade edge.

Here, in the conventional grinding method, as shown in FIG. 10, the operator grasps the distal end portion of the drill 1 'and contacts both cutting edge portions of the tip with the outer surface of the disc-shaped grinding wheel 100' as shown in FIG. Has been used a method of friction processing.

However, in the above method, as the grinding operation is performed by the direct friction action of the operator's eye, the blade tip angle and the blade clearance angle of the drill cutting edge portion can be precisely set to the original required angle without the skilled person. Since the cutting efficiency of the drill is lowered and the wear and tear of the drill caused by repeated grinding of the wrong grinding part several times and the time required for a long time, the cutting operation is inefficient and inefficient. Due to the limitation of the place, which is possible only in the place where the whetstone is provided, a lot of inconveniences were caused.

Therefore, the object of the present invention, in view of the conventional problems as described above, anyone can grind the end of the drill simply and accurately using the grinding guide means, even inexperienced beginners, and the convenience of the place according to the weight reduction of the product type It is to provide a grinding tool that can grind the end of the drill at any time without restriction.

In order to achieve the above object, a chuck and a fastener having a plurality of elastic holding pieces are formed in the cylindrical insert body to form a holder means for holding the drill to be rigidly penetrated, and then the portable case type The grinding means consisting of a cylindrical grinding wheel and a driving motor is installed inside, while the holder means is inserted through the hole in the upper side of the grinding wheel, and the cutting edge part and the grinding wheel are contacted at the correct grinding angle through the angle varying device. Grinding device is formed by installing the grinding guide means, and the protruding length adjusting means for adjusting the front protrusion length with the holder means for maintaining the accurate grinding distance between the drill and the grinding wheel by using the lifting plate and the forceps plate. Thus, the operator supplies power to the motor to rotate the cutting grindstone and drill in the holder means. While inserting, the correct grinding distance is maintained and fixed by using the protruding length adjusting means, and then inserted into the grinding guide means and swiveled from side to side, so that the cutting edge angle and the cutting edge angle set on the cutting edge portion are accurately formed. Grinding tool is provided, which will be described in detail based on the accompanying drawings prepared in accordance with a preferred embodiment of the present invention.

The present invention, as shown in Figure 1, the grinding means (3) for grinding the cutting edge portion of the drill as a grinding wheel for high speed rotation, located in the case (2), and the grinding wheel (31) upper side of the grinding means A grinding device (B) having a grinding guide means (4) installed at the rear side and a projection length adjusting means (5) coupled to the rear of the grinding guide means to set the most suitable protrusion length of the grinding drill; It is composed of a holder means (A) for holding the cutting edge portion of the drill held in combination with the protrusion length adjusting means (5), the grinding guide means (4), etc., while inserting and fixing the cutting drill.

First, referring to the holder means (A), as shown in FIGS. 2 and 3, a threaded portion 622 is provided on the outer periphery of the central portion with a drill through hole 621 in the longitudinal direction therein, and a plurality of elastic holding portions thereunder. Simultaneously with the pieces 623 formed, a chuck 62 having a thick portion 624 having a rectangular outer surface is formed at the bottom of each outer side of the elastic holding piece 623, and then on both sides of the upper outer peripheral surface. Flange portions 615 are provided with symmetrical downwardly projecting portions 616, respectively, with an enlarged hole portion 611 on the upper side and a stepped portion 612 on the lower side, and a thick portion of the elastic holding piece on the lower portion ( After forming a cylindrical insertion body 61 having a reduction hole portion 613 for insertion through the chuck having a rectangular tapered portion 614 to be in surface contact with the 624 and inserting the chuck 62 therein, With a knob 631 at the top and a screw portion 632 to be screwed with the screw portion of the chuck on the inner peripheral portion When the fastener 63 is inserted into the enlarged hole 611 from the upper portion of the insertion body 61 and the knob 631 is turned, the lower end surface of the fastener 63 idles on the step 612 while the screw portion ( As the chuck 62 is raised by the combination of the 632 and 622, the inner diameter of the drill through hole 621 is reduced by the contact between the thick portion 624 and the tapered portion 614, and the cut-through is penetrated therein. The outer circumferential surface of the drill 1 is wrapped and held in a compressed state (see Fig. 8B).

At this time, the chuck 62 has the angular outer surface of the thick portion 624 in contact with the angular tapered portion 614, so that even if the rotational force is transmitted when the threaded portion is coupled, the chuck 62 does not idle in the insertion body 61 without turning inward. Murad only works. In addition, since the drill through hole 621 of the chuck 62 should be varied according to the outer diameter of the drill, it is preferable to form three sizes of large, medium, and small to hold most of the drills generally used.

Next, referring to the grinding apparatus B, cylindrical grinding is carried out in the grinding space 21 of the case 2 having the grindstone inlet 23 at the front and the cutout 22 at the top, as shown in FIGS. 1 and 8. Since the grindstone 31 is fastened and installed by the nut member 35 at the distal end of the rear drive motor 34 supported by the bearing 33, when the power is supplied to the drive motor 34, the grinding wheel 31 has a high speed. Is rotated.

In addition, a grinding guide means 4 having an angle variable device is attached to the cutout portion 22 on the upper side of the grinding wheel 31, which is attached to the holder means in the center as shown in FIGS. Guide body 41 having a hole 42 to insert the insertion body 61 of the insertion body and to guide the turning, the incision part 22 using both side support brackets 43 eccentrically coupled to both side walls of the grinding space 21. ) It was installed so as to swing back and forth in the space.

At this time, around the hole 42 of the upper surface of the guide body 41 has a length (L) of the cutting edge grinding allowable width and inclined by an angle (θ ₃ ) corresponding to the blade clearance angle (θ ₂ ) An arc-shaped protrusion 44 formed with a mold grinding guide 45 is formed, and on one side, three fixing pins 47 penetrated from the side of the case 2 are inserted (80 °, 118 °, 130). Angle fixing grooves 46 are formed, thereby allowing the angle of the guide body 41 to be varied (see FIG. 4a).

Therefore, when the guide port 41 is installed in accordance with the cutting edge angle of the drill, and the holder means A in which the cutting drill 1 is installed is inserted therein, the flange projection 616 of the insertion body 61 is circular. It is placed on the arc-shaped protrusion 44, by turning it and turning it into the grinding guide 45 to rotate the cutting edge portion of the tip of the drill (1) is in contact with the surface of the grinding wheel (31). In addition, above the bearing engaging portion 26 behind the grinding guide means 4, when the holder means A is coupled with the grinding guide means, the cutting edge portion of the cutting drill is most applied to the surface of the grinding wheel 31. Protruding length adjusting means 5 of the drill for making ideal contact are provided.

The reason for the installation is as shown in Figs. 1 and 8, the holder means for fitting the distance L from the bottom surface of the concave grinding guide portion 45 of the grinding guide means 4 to the surface of the grinding wheel 31. Since the distance (L ₁ ) from the bottom surface of the flange protrusion 616 to the bottom surface of the body constituting the insertion body is already set, the remaining length (L ₂ ) must be adjusted to the protrusion length of the drill (1). to be.

Accordingly, while the arc 22 is formed at the rear of the cutout part 22 on the upper side of the case 2, the arc-shaped guide protrusions 24 for guiding the insertion of the insertion body 61 are formed on both sides of the lower end of the insertion body 61. Coupling with one chamfer 617 forms a projecting force 25 to serve as a turning prevention role.

In addition, in the installation space between the bottom surface of the both side protrusion force 25 and the upper surface of the lower bearing coupling portion 26, the guide member 51 as shown in FIG. Inner drill holes 512 and 512 'having different sizes on the inner side and first spaces 513 and 513' on which the drill fixing member 52 slides left and right, and openings on one side of the front side. The second spaces 514 and 514 'having 515 and 515' are formed by a pair of semi-molded bodies 511 and 511 'which are sequentially formed. In addition, the drill fixing member 52 coupled to and installed in the first spaces 513 and 513 'has drill holes 522 and 522' having different sizes in the central portion, and the outer surface of the drill fixing member 52 as shown in FIG. Similarly, 11 pairs of sliders 521 and 521 'having pressing parts 523 and 523', which protrude outwardly of the case 2, are installed as a mutual compression spring body 524, and the second space ( 514) and 514 'in the transverse concave groove 531 for inserting the drill tip on the upper side and the drill projection length setting position at the lower side of the front surface of the grinding wheel 31 through the openings 515 and 515'. The lifting hole 53 on which the joining protrusion piece 532 was attached was installed to move up and down in a state in which the spring body 533 was installed underneath.

Therefore, initially, the insertion body 61 is inserted into the guide protrusion 24 while the drill 1 is inserted through the drill 1 into the chuck 62 of the holder means, as shown in FIG. 8A. While combining the chamfer 617 and the projecting force 25 while pressing any one of the left and right sliders (521, 521 ') according to the diameter of the drill to be cut , The spring body 524 is moved inwards while compressing the drill through holes 522, 522 'and the cutting grooves of the guide member bodies 511, 511' coincide, so that the drill is lowered (Fig. 8). Fig. (A), the downwardly pressing the drill while lowering the hatch 53 while compressing the sprim body 533 in the state that the cutting edge portion of the tip is inserted into the concave groove 531, the projection piece 532 Bottom surface of the grinding wheel 31 touches the upper surface and stops.

At this time, when the pressing part is released, the slider is axially transported by the compression spring body 524, while holding the drill 1 firmly as the inner circumferential surface of the drill through hole and the inner circumferential surface of the incision groove. By turning (63), the elastic holding piece 623 of the chuck 62 is held inwardly to firmly hold the drill protruding to an appropriate length (see also FIG. 8B).

Then, pressing the pressure port again slightly to remove the holder means (A) and then insert into the grinding guide means (4) to grind the blade tip of the drill tip. Since the long hole 27 formed on one side of the case 2 is inserted as shown in FIG. 4A, a separate dressing tool 7 is inserted therethrough to move back and forth in surface contact with the grinding wheel 31. This is to even out the partially worn abrasive stone surface for prolonged use.

The present invention constructed and operated as described above comprises a grinding device including a grinding means, a grinding guide means and a protrusion length adjusting means in a small case in which a drill tip grinding tool is portable, and a separate drill holder means. Therefore, the compact and lightweight product can be easily installed and used in any work place, and the grinding operation of the drill cutting edge is combined with the drill in a suitable state in the holder means using the protrusion length adjusting means, and then the grinding guide means. If the turning operation while inserting inside the grinding edge is formed automatically and the cutting edge angle is grinding, the grinding work is very convenient, efficient and quick and accurate, it has an exceptional effect.

Claims (9)

In constructing a grinding tool for grinding and regenerating the cutting edge portion of the damaged drill tip to have a predetermined blade tip angle and a clearance angle, the drill 1 for cutting is cut by using a chuck and a fastener located in the insertion body 61. Holder means (A) so as to penetrate through or separate the cutting edge portion in a state of protruding forward to be suitable for grinding; Grinding means (31) coupled to its own driving means is located in the cutting space (21) of the case 2, the grinding means 3 and the cutting edge of the drill while being located in the cut portion 22 of the upper grinding wheel Grinding guide means (4) which is angularly variable by using both hinge portions, and inserts the holder means (A) through the holes therein to accurately contact the cutting edge portion of the drill with the surface of the grinding wheel, and The protruding length is set according to the grinding distance L of the grinding guide means by using the guide member having the drill fixing member and the hatch means in the upper position of the bearing coupling part of the case. Grinding tool at the end of the drill blade, characterized in that configured as a grinding device (B) having an adjusting means (5) to adjust. 2. The holder means (A) according to claim 1, wherein the holder means (A) has a cylindrical shape having a predetermined length, and includes a flange portion 615 having a pair of symmetrical protrusions 616 around the upper end and a chamfer 661 on the lower outer periphery. And an insertion body 61 in which an enlarged hole portion 611 and a reduction hole portion 613 having a tapered portion 614 at a lower end thereof are separated from each other as a step 612, and a drill through hole 621 therein. And a chuck 62 having a plurality of elastic holding pieces 623 having a screw portion 622 at a central portion of the outer circumferential surface and a thick portion 624 at a lower side outer surface thereof, and a knob 631 at the upper portion thereof. And a fastener 63 having a threaded portion 632 at a predetermined position in the inner circumference thereof. 3. The grinding edge of claim 2, wherein the outer surface of the thick portion 624 of the elastic holding piece 623 and the tapered portion 614 of the insertion body 61 are formed in a square surface for preventing turning. tool. The grinding means (4) according to claim 1, wherein the grinding means (4) is fastened to the distal end of the shaft (32) in which the cylindrical grinding wheel (31) is supported as a bearing (33) in the grinding space (21). The rear end of the grinding tool of the drill blade end, characterized in that the drive motor 34 is coupled to the installation configuration. The grinding guide means (4) according to claim 1, wherein the grinding guide means (4) has a hole (42) for inserting the holder means therein, and an inclined grinding guide portion (45) having an inclination angle (θ ₃ ) corresponding to a blade clearance angle at its upper peripheral surface. Circumferentially coupled to both sides of the grinding space in the cutout portion 22 on the upper side of the grinding wheel, and an arc-shaped protrusion 4 having an inner side and a guide body 41 having an angle variable device on one side thereof. Grinding tool of the end of the drill, characterized in that the coupling is configured integrally with both side support bracket (43). According to claim 5, The variable angle device, a plurality of concave grooves 46 are formed at a predetermined interval on one side of the guide body 41 at the same time, is inserted through the inside of the groove from the outside of the case (2) Grinding tool at the end of the drill, characterized in that the coupling is configured as a pin (47). The projecting length adjusting means (5) is provided with an arc-shaped guide protrusion (24) having opposite protrusions (25) provided on both sides of the inner side from behind the cutout portion (22) of the case (2). A guide member 51 having a cutout groove at a side surface, a second space having a first space at a lower side thereof, and a second space having a front opening, and being fitted and fitted between the lower portion of the protruding jaw 25 and the bearing coupling portion 26; And a drill fixing member 52 having a drill through hole and a pressing part for external protrusion on the side, and installed in the first space so as to slide left and right in a spring body, and a concave groove 531 on an upper side and a lower side of the front side. And a protruding pin (532), the grinding tool of the end of the drill blade, characterized in that the coupling is configured as a lifting hole (53) which is installed in the second space in the state in which the spring body (533) in the bottom of the installation. The guide member (51) according to claim 7, wherein the guide member (51) has different sizes of cutout grooves (512) (512 ') inside the upper side, first spaces (513) (513'), and openings respectively penetrated thereunder. (515) (515 ') a pair of symmetrical half-molded bodies (511, 511') having a second space (514, 514 ') having a combined configuration of the drill edge 8. The drill fixing member (52) according to claim 7, wherein the drill fixing member (52) has a pair of sliders (521) having pressing parts (523, 523 ') on the outer surface and drill through holes (522, 522' of different inner diameters, respectively. A grinding tool at the end of the drill blade, characterized in that 521 'is interlocked as a compression spring body 534 installed between the inner surface of each other.

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