JPS5852784B2 - Drill edge polishing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus capable of accurately polishing the cutting edge of a drilling drill.

Conventionally, when polishing the cutting edge of a drill, the drill was removed from the spindle of the machine tool and polished. However, when the polished drill was reinstalled on the spindle, the attachment between the drill and the spindle would be distorted. As a result, it was difficult to perform drilling with the same precision as before polishing.

SUMMARY OF THE INVENTION In order to eliminate these conventional drawbacks, it is an object of the present invention to provide a device that polishes the cutting edge of a drill while the drill remains attached to the spindle of a machine tool. .

An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a box-shaped bed having an appropriate height, and an electromagnet 2 is mounted inside the bed.

Reference numeral 3 denotes a cylindrical guide body which is erected and fixed to the upper side end of the bed 1, and has a square screw 3a screwed onto its outer peripheral surface.

Reference numeral 4 denotes a base plate disposed above the bed 1. A boss portion 5 is protruded from one end of the base plate, and a female screw portion formed on the inner peripheral surface of the boss portion 5 is screwed into the square screw 3a of the guide body 3. It's a combination.

Reference numeral 6 denotes a gate-shaped motor support frame that is integrally erected on the upper surface of the other end of the base plate 4, and includes a dovetail groove 7 provided on the inner facing surface of the frame 6 and guide portions 9 provided at both front ends of the motor 8. The motor 8 is attached to the motor support frame 6 so as to be movable up and down, and a bundle 10 is attached to the back of the upper end of the frame 6, and the bundle 10 connects the motor support frame 6 to the guide body 3 via the base plate 4.
It is designed to move upward while rotating by an appropriate angle around 0.

Further, an adjusting screw 11 is made to protrude downward through a vertical hole 6a provided on the upper end side of the motor support frame 6, and the adjusting screw 11 is
1 into the screw hole 12 provided at the upper end of the motor 8,
The vertical position of the motor 8 is adjusted by rotating a knob 130 that is integrally fixed to the upper end of the adjustment screw 11.

That is, a scale 13a is provided on the knob 13 so that the vertical adjustment position of the motor 8 can be read.

14 is a rotary grindstone that is attached to the rotating shaft 15 of the motor 8;
The outer peripheral polished surface is formed into an inclined surface along the cutting edge angle of the drill D to be polished.

Reference numeral 16 denotes a centripetal tool for setting the center position of the drill D to be polished; its tip is formed into a forked shape so as to hug the sides of the drill D, and the tool is slid horizontally within the sheath body 17. In addition, the position of the centripetal tool 16 with respect to the center of the drill can be read by the scale 18 provided on the centripetal tool 16 and the sheath body 17.

19 is a set bolt of the centripetal fitting 16 provided on the sheath body 17;
After adjusting the position of the centripetal tool 16, it is set in the sheath body 17.

Reference numeral 20 denotes a support shaft of the centripetal tool 16, and the sheath body 17 is fixed to the upper end with a bolt 21. The sheath body 17 is fixed to the upper end by a bolt 21, and the sheath body 17 is erected on the top surface of the bed 1 concentrically with the guide body 3, and is attached to the bed 1 with a nut 22 together with the guide body 3. It is fixed.

Reference numeral 23 denotes a cutting edge receiving stopper for setting the position of the cutting edge of the drill D to be polished.The cutting edge receiving stopper 23 is fixed by a set bolt 25 to the upper end of a support shaft 24 provided upright on the upper surface of one side of the bed 1. The collar 26 fitted on the support shaft 24 on the lower surface of the collar 23 is set on the support shaft 24 by the set bolt 27, and the position of the cutting edge receiving stopper 23 is adjusted up and down by loosening the set bolts 25 and 27. The horizontal position is adjusted according to the diameter of the drill D.

To explain how the embodiment configured as described above is used, the bed 1 is attached to a metal work table (not shown) such as an iron plate of a machine tool equipped with a drill D to be polished.
The rotary grindstone 14 is placed on top of the drill D so that it is positioned below it.

Next, the drill D is lowered and the cutting edge surface is
After bringing the tip of the cutting edge stopper 23 close to the outer peripheral surface of the drill D, set the position of the cutting edge by bringing the tip of the cutting edge stopper 23 into contact with the side surface of the tip of the twisted blade of the drill D, and turn the knob 13 to set the adjusting screw 11.
is adjusted, the motor 8 is moved upward, and the outer polished surface of the rotary grindstone 14 is brought into contact with the cutting edge surface of the tip of the drill D, and the scale 13 is
The vertical position of the rotary grindstone 14 at that time is read by a, the centripetal tool 16 is further advanced and fixed in contact with the side surface of the drill D, and the center position of the drill D at that time is read by the scale 18.

Next, while rotating the motor 8 and polishing the cutting edge of the drill D, the bundle 10 is operated and the motor support frame 6 is
When rotated around the guide body 3, the rotary grindstone 1 is rotated together with the motor support frame 6 according to the inclination angle of the square screw 3a.
4 moves upward to form a relief angle for the cutting edge of the drill D.

That is, in FIGS. 9 and 10, the rotary grindstone 14 is (
4) The clearance angle of the cutting edge is the amount by which the rotary grindstone 14 moves upward due to the lead of the square screw 3a while moving from the position (B>).

After polishing one cutting edge of the drill D in this way, the motor 8 is stopped, the set bolt 19 of the centripetal tool 16 is loosened, the centripetal tool 16 is moved back, and the cutting edge receiver stopper 23 is separated from the drill D. , further turn the knob 13 to lower the motor 8 slightly to lower the rotary grindstone 14 to the drill D.
After the drill D is rotated 1800 times, the cutting edge stopper 23 is again brought into contact with and engaged with the side surface of the twisted blade of the drill D, and the centripetal tool 16 and the rotary grindstone 14 are lowered from the cutting surface of the drill D.
The position is returned to the previous scale position and set, and the same operation as described above is repeated to polish the other cutting edge.

As described above, in the present invention, a guide body having an inclined guide surface such as a square screw on the outer peripheral surface is erected at an appropriate position on the upper surface of a bed containing an electromagnet, and one end of a motor support frame is attached to the inclined guide surface of the guide body. The part is rotatably supported, and
A motor with a rotary grindstone attached to the upper surface of the other end of the motor support frame is attached so as to be movable up and down, and a centripetal tool for setting the center position of the drill to be polished is provided at an appropriate position on the upper surface of the bed. This is a drill edge polishing device that is equipped with a drill edge receiver and collar for setting the drill edge position, so all you need to do is place the bed on the work table of the machine tool and fix it with an electromagnet. This allows you to easily sharpen the drill while it is still attached to the spindle, and by rotating it around the guide body that is a rotary whetstone, the whetstone automatically moves up and adjusts the clearance angle of the cutting edge. It can be formed accurately, and furthermore, the center position of the drill can be set using the centripetal tool, and the position of the cutting edge of the drill can be set using the cutting edge receiving stopper, thereby allowing highly accurate cutting edge polishing.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway side view, FIGS. 2 and 3 are partially cutaway front views, and FIG. 4 is a front view of the motor; Fig. 5 is a partial side view of the front end of the motor, Fig. 6 is a partial plan view of the front end of the motor, Fig. 7 is a sectional view of the main parts showing the installation state of the guide body and centripetal device, and Fig. 8 9 is a cross-sectional view of the main part showing the state in which the blade edge receiving stopper is attached, and FIGS. 9 and 10 are plan views showing the state in use. 1...Bed, 2...Electromagnet, 3...
...Guide body, 3a...Square screw, 6...
... Motor support frame, 8 ... Motor 16 ... Centripetal tool, 23 ... Cutting edge receiver stopper.

Claims (1)

[Claims] 1. A guide body having an inclined guide surface such as a square screw on the outer peripheral surface is erected at a suitable position on the upper surface of the bed containing a built-in electromagnet, and one end of the motor support frame is rotatably mounted on the inclined guide surface of the guide body. At the same time, a motor with a rotary grindstone attached to the upper surface of the other end of the motor support frame is attached so as to be movable up and down, and a centripetal tool for setting the center position of the drill to be polished is erected at an appropriate position on the upper surface of the bed. 1. A drill cutting edge polishing device characterized in that a cutting edge receiving stopper is provided for setting the cutting edge position of the drill to be polished.