JPH0521313Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drill tip cutting edge correction device that corrects the tip cutting edge of a drill by grinding.

[Prior Art] Generally, the tip cutting edge of a drill is modified using a universal tool grinder. In this case, the cutting edge angle of the drill tip is set by leveling the cutting edge of the drill with respect to the table, and then by rotating the table with respect to the surface where the grindstone is used. The relief angle is set by tilting against the Conventionally, leveling of the tip cutting blade was performed using a dial gauge or the like.

[Problems to be solved by the invention] For this reason, there were problems in that it took time to level the cutting edge at the tip, and it was troublesome to correct the cutting edge at the tip of the drill.

The present invention aims to solve the above problems.

[Means for solving the problem] The present invention relates to a drill tip cutting edge correction device having a drive unit that rotates a grinding wheel and a table that holds a drill, the device comprising: a cylindrical holder having a base end formed with a hole into which a shank portion provided on the base end side of the range in which the cutting edge and grooves of the drill are precisely fitted, and a threaded hole formed orthogonal to a chamfered portion that is at a predetermined phase in the circumferential direction of a circle centered on the axis of the drill with respect to the tip cutting edge formed on the shank portion to be fitted; a fixing bolt that screws into the threaded hole of the holder and has a tip surface formed as a plane orthogonal to the threaded portion; and a support member that is installed on the table and supports the holder in a position where the tip cutting edge of the drill is horizontal to the table, with the chamfered portion of the drill shank portion being arranged so as to be perpendicular to the threaded hole of the holder.

[Function] In the present invention, in order to fix the drill to the holder, the shank part of the drill is fitted into the hole of the holder,
Orient the chamfer to the screw hole. Then, when the fixing bolt is tightened, the end surface of the fixing bolt is pressed against the chamfered portion. At this time, the end surface of the fixing bolt and the chamfer of the drill match, and the chamfer becomes perpendicular to the screw hole. When this holder is supported by the support member, the cutting edge of the drill tip becomes horizontal with respect to the table since the mounting surface of the drill shank is orthogonal to the screw hole.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

In FIGS. 1 to 3, 1 is a base, and on the reference plane 1a on this base 1, support columns 2a,
A grindstone drive motor (drive unit) 4 is provided on these supports 2a, 2a via a bracket 3. A tapered cup-shaped diamond grindstone 5 is attached to the tip of the rotating shaft of the motor 4.

The bracket 3 is connected to the columns 2a, 2a by bolts 6, 6 such that the motor 4 rotates in the vertical direction (direction perpendicular to the reference plane 1a) about the bolts 6, 6. . Two positioning holes 3a are formed in the bracket 3 at a predetermined interval on the contact surface with the support column 2a.
A pin 7, which is inserted into a hole 2b formed in the support column 2a, is fitted into each positioning hole 3a. Then, either positioning hole 3a
By fitting the pin 7 into the motor 4, the perpendicular to the working surface 5a of the grindstone 5 attached to the motor 4 is vertically tilted at 7° with respect to the reference surface 1a of the base 1, as shown in FIG. Or the angle is set in steps of 10 degrees.

Further, two rails 8, 8 are installed on the reference surface 1a of the base 1 in parallel with the use surface 5a of the grindstone 5, and a table 9 is installed on these rails 8, 8. . As shown in FIG. 2, this table 9 includes a lower moving part 9a that is movable along the rails 8, 8, and a grindstone 5 relative to the lower moving part 9a.
The upper moving part 9b is movable toward and away from the base 1 and has an upper surface kept parallel to the reference plane 1a of the base 1. The table 9 is provided with a handle 10 for moving the upper moving part 9b relative to the lower moving part 9a, and the handle 10 is provided with a scale 10a for measuring the amount of movement.

On the top surface of the table 9, there is a holder 1 which will be described later.
A support member 11 that supports 6 is installed. This support member 11 is a flat index base 11.
A block 11c having a V-shaped groove 11b is integrally formed on the upper surface of the block 11b.
A pin 12 is provided on the tip end side of the axis (on the use surface 5a side of the grindstone 5), and the grinding wheel 5 is placed so as to be able to pivot in a horizontal plane about the pin 12. In addition, the groove 11
A reamer bolt 13 is provided on the rear end side on the axis line of b, and is screwed onto the base 11a, and the upper surface of the table 9 has two positioning holes 9c, 9c into which the tip of the reamer bolt 13 fits. are formed at predetermined intervals. By fitting the reamer bolt 13 into either of the positioning holes 9c, the axis of the groove 11b is aligned in a direction parallel to the reference surface 1a with respect to the perpendicular to the use surface 5a of the grindstone 5, as shown in FIG. It is now set at 15° or 20°. Further, in the state set at the above angle, this support member 11 is fixed on the table 9 by mounting bolts 14, 14 inserted into holes 11d, 11d formed in an arc shape with the pin 12 as the center. .

Furthermore, a holder 16 for holding a drill 15 is placed in the groove 11b of the support member 11. As shown in FIGS. 4 and 5, this holder 16 is formed into a cylindrical shape, and the shank portion 15a of the drill 15 having a predetermined diameter is precisely fitted into the axial center of the holder 16. A hole 16a and an escape hole 16b are formed. A flange 16c perpendicular to the hole 16a is formed on the outer circumference of the tip of the holder 16, and a flange 16c is formed on the peripheral wall.
A plurality of screw holes 16d are formed perpendicularly to the hole 16a, penetrating from the outer peripheral surface to the hole 16a, and further at 90° in the circumferential direction with respect to these screw holes 16d.
A screw hole 16e that penetrates from the outer peripheral surface to the relief hole 16b is formed at a shifted position.

The drill 15 has a shank portion 15a,
A chamfered portion 15c is formed parallel to the tip cutting edge 15b, and the chamfered portion 15c is inserted into the hole 16a with the chamfered portion 15c facing the screw hole 16d of the holder 16. A fixing bolt 17 is screwed into the screw hole 16d of the holder 16 to fix the drill 15 by pressing its tip against the chamfered portion 15c of the drill 15 inserted as described above.

This fixing bolt 17 has its tip formed with a flat surface perpendicular to the axis, and by pressing the tip against the chamfered portion 15c of the drill 15,
The chamfered portion 15c follows the direction perpendicular to the screw hole 16d of the holder 16. That is, the tip cutting edge 15b and the screw hole 16 of the holder 16
d become orthogonal. On the other hand, as shown in FIG. 1, a round bar 18 having a threaded tip is screwed into a screw hole 16e penetrating the relief hole 16b.

The support member 11 also has a stopper 11 that supports the round bar 18 horizontally (parallel to the reference surface 1a of the base 1) when the holder 16 is placed thereon.
f are formed on both left and right sides of the groove 11b.

As shown in FIGS. 1 and 2, the holder 16 has the flange 16c in contact with the distal end surface 11e of the support member 11 with the drill 15 attached, and the round bar 18 on either side. The round bar 18 is placed in the groove 11b in a horizontal state by contacting the stopper 11f. Further, each of the holders 16 is individually manufactured to have holes 16a having diameters into which drills 15 of various diameters are fitted. However, the outer peripheral diameters of each holder 16 are all formed to be the same.

Further, in FIGS. 1 and 2, 19 is a lever for moving the lower moving part 9a of the table 9 along the rail 8, and 20 is a cover for the grindstone 7. This cover 20 covers the use surface 5a of the grindstone 5 by 1/
Only the drill 4 is open, and the structure is such that it covers all the grindstone surfaces that are unnecessary for grinding the other drills 15.
Furthermore, in FIG. 1, α is the tip angle of the drill 15, and in FIG. 4, β is the clearance angle of the drill 15.

Next, a method for correcting the tip cutting edge 15b of the drill 15 using the above correction device will be described. First, fit the drill 15 into the hole 16a of the holder 16, and
5c toward the screw hole 16d. Then, the fixing bolt 17 is tightened to fix the drill 15 to the holder 16. At this time, the chamfered portion 15c of the drill 15
follows the tip surface of the fixing bolt 17, and the screw hole 16
perpendicular to d. In addition, the support member 11 is made pivotable by loosening the mounting bolt 14, and the reamer bolt 1
3 into the predetermined positioning hole 9c. As a result, the axis of the groove 11b is inclined by 15° or 20° with respect to the perpendicular to the use surface 5a of the grindstone 5 in a direction parallel to the reference surface 1a. Then, the support member 11 is fixed to the table 9 by tightening the mounting bolt 14. next,
The holder 16 to which the drill 15 is fixed is attached to the support member 11
is placed on the groove 11b of the support member 11, and the flange 16c is brought into contact with the distal end surface 11e of the support member 11. Then, the holder 16 is rotated, and the round bar 18 is brought into contact with one stopper 11f provided on the support member 11. Thereby, the tip cutting edge 15b of the drill 15 becomes parallel to the reference plane 1a of the base 1. By installing the drill 15 in this manner, the axis of the drill is inclined by 15° or 20° with respect to the perpendicular to the use surface 5a of the grindstone 5 in a direction parallel to the reference surface 1a. When tilted by 15 degrees, the working surface 5a of the grinding wheel 5 becomes parallel to the cutting edge 15b with a tip angle α of 150 degrees, and when tilted by 20 degrees, the tip edge angle α is 140 degrees. The use surface 5a of the grindstone 5 is parallel to the cutting edge 15b.

On the other hand, in order to align the use surface 5a of the grindstone 5 with the clearance angle β of the cutting edge 15b of the drill 15, first loosen the bolt 6, make the bracket 3 rotatable relative to the supports 2a, and then set the pin 7 in a predetermined position. It fits into the positioning hole 3a of. As a result, the use surface 5 of the grindstone 5
The perpendicular to a is inclined by 7° or 10° in the vertical direction with respect to the reference plane 1a. At this time, the inclination of the use surface 5a of the grindstone 5 matches the clearance angle β of the drill 15 of 7° or 10°. Then, the bolts 6 are tightened to fix the bracket 3 to the supports 2a, 2a.

With the grinding wheel 5 installed as described above, operate the lever 19 and handle 10 while rotating the grinding wheel 5, and move one tip of the cutting edge 15b to the working surface of the grinding wheel 5.
Move to a and cut. At this time, the holder 16
is held against the support member 11 by hand. After confirming that one tip cutting edge 15b has been ground by a predetermined amount using the scale 10a, the handle 1
0 is reversed and the drill 15 is retracted from the grindstone 5. Next, the holder 16 is rotated on the groove 11b, and the round bar 18 is brought into contact with the other stopper 11f. This allows the drill 15 to move around the axis.
The drill 15 rotates by 180 degrees, and the other tip cutting edge 15b of the drill 15 becomes parallel to the use surface 5a of the grindstone 5. In this state, the other tip cutting edge 15b of the drill 15 is ground in the same manner as described above. However, the grinding allowance should be the same as the amount confirmed on the scale 10a.

In this way, the tip edge angle α is 140° or
The tip cutting edge 15b of the drill 15 with a relief angle β of 150° and 7° or 10° is ground and corrected.

According to the correction device configured as described above, by placing the holder 16 on the support member 11 and applying the round bar 18 to the stopper 11f, the tip cutting edge 15
b can be positioned parallel to the reference plane 1a of the base 1, there is no need to level the tip cutting edge 15b using a dial gauge, etc., and the drill 15
It is possible to shorten the correction time. Further, the holder 16 is made separately into which the drill 15 of a predetermined diameter fits, and they all have the same outer diameter, so even if the diameter of the drill 15 changes,
The tip cutting edge 15b can be installed at approximately the axial center position of the use surface 5a of the grindstone 5 without adjusting the vertical position of the use surface 5a. Moreover, pin 7
By fitting the reamer bolt 13 into the positioning hole 3a, the inclination of the use surface 5a of the grinding wheel 5 can be adjusted to the clearance angle β of the drill 15 of 7° or 10°, and by fitting the reamer bolt 13 into the positioning hole 9c. ,
The use surface 5a of the grindstone 5 can be made parallel to the cutting edge 15b having a tip angle α of 140° or 150°. Therefore, the use surface 5a of the grindstone 5 can be adjusted to the clearance angle β and tip angle α of the drill in a short time, and the tip cutting edge 15b of the drill 15 can be easily corrected in a further short time.

Furthermore, since the motor 4 is only for grinding the tip cutting edge of the drill 15, it only needs to be small.
Further, since the table 9 only needs to be small enough to hold the drill 15, the entire correction apparatus can be made smaller and lighter. Therefore, this correction device can be easily brought to the site where holes are being processed using a drill, and compared to bringing a drill into a grinding room and grinding it with a universal tool grinder, the drilling process can be done in a short time and without any trouble. can be corrected.

Further, since the cover 20 covers the entire surface of the grinding wheel except for the part necessary for grinding, the grinding wheel can be operated safely against scattering of dust and the like.

In the above embodiment, the chamfered portion 15c of the drill 15 is formed parallel to the tip cutting edge 15b, but the chamfered portion 15c is positioned in a direction perpendicular to the tip cutting edge 15b. , or may be formed at other angles. However, in this case, the round bar 18 needs to be installed so that when the holder 16 is placed on the support member 11, the tip cutting edge 15b of the drill 15 is parallel to the upper surface of the table 9. Further, although the outer peripheral surface of the holder 16 is formed in a cylindrical shape, it may be formed in a rectangular tube shape such as a square or a regular hexagon. In this case, the groove 11a is inserted into the outer peripheral surface of the holder.
If you make a shape that matches the surface or more, the round bar 18
The tip cutting edge of the drill can be leveled without the need for a

Further, although the groove 11a of the support member 11 is formed in a V-shape, it may be formed in a cylindrical shape to match the outer peripheral surface of the holder 16.

[Effect of the invention] As explained above, according to the invention, by tightening the fixing bolt, the tip end surface of the fixing bolt is pressed against the chamfered part, and at this time, the chamfered part of the drill is brought into contact with the tip end surface of the bolt. Since they match, the chamfer of the drill becomes perpendicular to the screw hole of the holder. Therefore, when the holder with the drill fixed thereon is supported by the support member, the chamfered portion of the drill is perpendicular to the screw hole, so the tip cutting edge of the drill becomes horizontal with respect to the table. Therefore, if a dial gauge is used to level the tip cutting edge of a drill as in the past, there is no need for the time and effort required, and the tip cutting edge of the drill can be easily corrected in a short time.

[Brief explanation of the drawing]

1 to 5 are views showing one embodiment of the present invention, in which FIG. 1 is a plan view of a drill tip cutting edge correction device, FIG. 2 is a front view of the same correction device, and FIG. 1, FIG. 4 is a sectional view of the holder, and FIG. 5 is a view taken in the direction of the arrows in FIG. 4. 4... Motor (drive part), 5... Grindstone, 5a...
... Use surface, 9 ... Table, 11 ... Support member,
15...Drill, 15a...Shank part, 15b
... Tip cutting edge, 15c ... Chamfered part, 16 ... Holder, 16a ... Hole, 16d ... Screw hole, 17 ...
fixing bolt.

Claims (1)

[Scope of Claim for Utility Model Registration] A drill tip cutting edge correction device comprising a drive unit that rotationally drives a grindstone and a table that holds a drill, which is provided on the proximal side of the cutting edge and groove forming range of the drill. A hole is formed at the base end into which the shank part is precisely fitted, and a hole is formed in the circumferential direction of a circle centered on the axis of the drill with respect to the tip cutting edge formed in the shank part to be fitted. A cylindrical holder is formed with a screw hole orthogonal to a chamfered part that is in a predetermined phase when facing, and a cylindrical holder is screwed into the screw hole of this holder, and the tip surface is formed with a plane orthogonal to the threaded part. a fixing bolt installed on the table, and with the holder arranged such that the chamfered part of the drill shank part is perpendicular to the screw hole of the holder, the tip cutting edge of the drill is placed against the table. A drill tip cutting edge correction device characterized by comprising: a support member that supports the drill tip in a horizontal position.