JPH0146266B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drill grinding machine of a type in which a drill tip is brought into contact at a constant angle with a cylindrical grindstone rotated by a rotating shaft parallel to a base, and in particular,
The present invention relates to a drill polishing machine equipped with a drill holding mechanism that can hold the drill and reliably rotate it 180 degrees to polish both edges of the cutting edge.

A drill polishing machine that polishes the cutting edge of a drill uses a motor installed parallel to the base to rotate a cylindrical grindstone. Move it at an angle,
A type of whetstone in which the cutting edge is ground on the inner surface of the tip of the whetstone is popular (see US Pat. No. 3,553,898). This type of drill polishing machine includes a holder that holds a drill on a slide base that moves parallel to the base. Conventionally, this holder was manually held on a slide base and moved together with the slide base to perform polishing work. Therefore, when moving the slide base, one must be careful not to move the holder, making the operation complicated. Also, after polishing one cutting edge of the drill tip, the direction of the drill must be reversed 180 degrees and the other cutting edge must be polished. It has to be pushed by hand and positioned, which requires double effort and reduces work efficiency.

The present invention was made in order to eliminate the drawbacks of the conventional drill holding mechanism in a drill polishing machine, and it supports a pair of holders that hold a drill on a slide base so that they can be rotated 180 degrees and positioned. The object of the present invention is to provide a drill polishing machine that can improve the efficiency of polishing work.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing the entire drill polishing machine, and FIG. 2 is a front view.

Reference numeral 1 in the figure is a base. A motor 2 surrounded by a case is provided on a base 1.
A feeding mechanism is built into the auxiliary stand 3 that supports the motor 2, and by rotating the handle 4 that protrudes to the rear of the auxiliary stand 3,
The motor 2 is adapted to move parallel to the base 1 in the direction of arrow AB. A cylindrical grindstone 5 is fixed to the tip of the rotating shaft 2a of the motor 2. Note that 2b is a cover that covers the upper side of the grindstone 5. On the other hand, an auxiliary stand 6 is fixed to the upper surface of the other end of the base 1, and a slide base 7 is installed on this auxiliary stand 6. The slide base 7 is connected to the grinding wheel 5.
It is designed to be able to slide in a direction tilted at a certain angle with respect to the rotation axis of , that is, in the direction of arrow C-D. A lever 8 is rotatably attached to the side surface of the auxiliary stand 6, and a pin 9 protruding from the side surface of the slide base 7 engages with the central portion of the lever 8 to rotate the lever 8. By the way,
The slide base 7 is designed to slide in the CD direction.

A fulcrum shaft 10 is provided on the upper surface of the slide base 7.
(FIG. 5) is fixedly installed, and the frame 11 is attached so as to be rotatable with respect to this fulcrum shaft 10. That is, as shown in FIG. 5 (exploded perspective view), this frame 14 has a pair of support plates 11a facing the slide base 7 at right angles,
11b and a connecting plate 11c interposed between them, forming a U-shape. A support hole 11 is provided in the center of the connecting plate 11c.
d is bored, and the fulcrum shaft 10 is inserted into this support hole 11d, so that the frame 11 can be rotated on the slide base 7 in a parallel direction. After rotationally displacing the frame 11 and setting the angle α between the frame 11 and the rotation axis of the grindstone 5 (see FIG. 6), the frame 1 is set by the set screw 12.
1 can be fixed to a fulcrum shaft 10.
Further, one support plate 11a has a support hole 11e.
Support holes 11f are formed coaxially with each other in the other support plate 11b, and a disk 1 is formed in the support hole 11e.
3, disks 14 are rotatably supported in the support holes 11f. That is, the boss portion 13a of the disc 13 is inserted into the support hole 11e, and the support plate 1
A rotating ball 15a at the tip of the set screw 15 screwed onto 1e engages with a groove formed on the circumferential surface of the boss portion 13a, and the boss portion 13a is rotatably supported by the rotating ball 15a. . Similarly,
A boss 14a is also formed on the disk 14, and this boss portion 14a is inserted into the support hole 11f, and a rotating ball (none of which is shown) of a set screw screwed onto the support plate 11b is inserted into the boss portion. The ball 14a engages in the groove 14b on the circumferential surface of the disc 1.
4 is rotatably supported. 16 and 17
are holders formed in substantially symmetrical shapes with respect to each other. One holder 16 has triangular teeth 16a,
16b, 16c, 16d... are formed to repeat peaks and valleys, and the other holder 1
7 also has triangular teeth 17a, 17b, 1
7c, 17d... are formed to repeat valleys and peaks. The teeth of the holders 16 and 17 are formed so as to overlap each other, that is, when the holders 16 and 17 are brought close to each other, the teeth 16a and 17
a, 16b and 17b, 16c and 17c, . . . are arranged alternately. Further, a V-shaped holding surface is formed by adjacent teeth of both holders 16 and 17, for example, 16a and 16b, 17a and 17a, and when combining both holders 16 and 17, this V-shaped The drill W is held by the holding surfaces (see FIG. 6 and subsequent figures). In addition, in FIG. 5, each holder 16, 1
A small protrusion 16i on the side surface of 7 and 1
7i is formed, and these slope parts 16i, 17
i is inserted into a rectangular guide hole 13b formed in the disc 13. On the other hand, a guide groove 14e surrounded by parallel guide surfaces 14c and 14d is also formed in the disc 14,
The other ends of the holders 16 and 17 are slidably inserted into the guide groove 14e. As shown in FIG. 7, the length X of the guide hole 13b is
Since the holders 16 and 17 are designed to be larger than the combined length x of the protrusions 16i and 17i when the drill W is held, the holders 16 and 17 can slide in the direction of the arrow EF by the difference in dimension. Further, a pair of holes 16j are formed through the holder 16, and a pair of holes 17j corresponding to the holes 16j are formed in the holder 17. A pair of guide pins 18 are inserted into the holes 16j of the holder 16, and the tips of the guide pins 18 are inserted into the holes 17j of the holder 17 and fixed to the holder 17 with spring pins or the like. . Also,
The other end of the guide pin 18 is inserted into a hole 19a formed at both ends of the holding fitting 19, and is fixed to the holding fitting 19 with a spring pin or the like. A screw hole 19b is formed in the center of the holding fitting 19, and a guide screw 2 is inserted into this screw hole 19b.
0 is screwed together, and furthermore, this guide screw 2
The tip of 0 is a screw hole 16 formed in the holder 16.
It is screwed into k. 21 is guide screw 2
This is a handle that is integrated with 0. The guide screw 20 has a tip portion 20a (a portion that screws into the screw hole 16k) and a base portion 20b (a portion that screws into the screw hole 19b) that are male threaded in opposite directions. Further, the screw hole 19b is a female screw hole corresponding to the winding direction of the base 20b, and the screw hole 16k is a female screw hole corresponding to the winding direction of the tip portion 20a. On the other hand, a stopper 22 is fixed to the upper end of the connecting plate 11c. A stop surface 22a having a right-angled cross section is formed at the top of the stopper 22, and as shown in FIG. ,
The holders 16 and 17 are positioned so as to be inclined by a certain degree β with respect to the upper surface of the base 1.

Next, the operation and effects of the drill polishing machine having the above configuration will be explained.

Before the polishing work, the rotational displacement position of the frame 11 is set. First, loosen the set screw 12,
The frame body 11 is rotated about the fulcrum shaft 10, and the angle is adjusted according to the type of drill W to be polished (FIG. 6).
, then tighten the set screw 2,
The frame body 11 is fixed to the slide base 7.
When sharpening a normal drill, α should be set to approximately 14°. This angle is the slide base 7
It is calculated from the intersection angle (45°) between the sliding direction C-D and the rotational axis of the grindstone 5 and the cutting edge angle (118°) of a normal drill W (see Figure 4). .

Next, the holder W is held between the holders 16 and 17. At this time, the handle 21 is first rotated in the loosening direction. As a result, the holder 16 screwed with the tip 20a of the guide screw 20 moves toward the handle 21, and the holding metal fitting 19
moves away from the handle 21. Since the holder 17 is connected to the holding fitting 19 by the guide pin 18, the holders 16 and 17 are separated from each other by this rotation operation. Next, a drill W for polishing is inserted from the front of the guide hole 13b of the disc 13 or from the rear of the central hole 14f of the disc 14. Then, the blade edge portion is connected to a pair of protrusions 16i.
The handle 21 is rotated in the tightening direction, that is, in the opposite direction to that described above, with the handle 21 protruding forward by an appropriate length from the handle 17i. As a result, both holders 16 and 17 approach each other, and each tooth 16a, 16
b, . . . , 17a, 17b, . The centrally resting portion of the drill W is clamped and fixed by the V-shaped holding surface. At this time, the double cutting edges W ₁ and W ₂ (see Figure 4) at the tip of the drill W are as follows:
The holders 16 and 17 are positioned and fixed so as to face in the direction of movement of the holders 16 and 17 toward and away from each other, that is, in the EF direction. After the drill W is held by the holders 16 and 17, the edge of the holder 17 is brought into contact with the stop surface 22a of the stopper 22, as shown in FIG. The holders 16 and 17 are positioned so that they are tilted by an angle β, and the holders 16 and 17 are lightly pressed so that they do not move by hand. This angle β is set to approximately 15° (the reason will be explained later). That is, the cutting edges W ₁ and W ₂ of the drill W held by the holders 16 and 17 are also inclined by an angle β with respect to parallel.

To perform polishing work, first turn on the switch (not shown) for the motor 2 to rotate the grindstone 5, then rotate the lever 8 (Fig. 1) to move the slide base 7 in the direction of arrow D. . At the same time, the handle 4 is operated to advance the motor 2 and the grindstone 5 in the direction of arrow A, and the inner tip 5a of the grindstone 5 polishes one of the cutting edges _W1 .

After polishing one blade edge W ₁ , move the slide base 7 in the direction of arrow C and place the blade edge on the grinding wheel 5.
away from. Then, holders 16 and 17 are
slide the holder 17 toward the stopper 2.
2 from the stop surface 22a (see Fig. 8). Next, the holders 16 and 17 are rotated in the direction of arrow G. As a result, the holders 16 and 17 are rotated in the direction G (FIG. 8), with the boss portions 13a and 14a of the discs 13 and 14 serving as rotational axes. Then, holders 16 and 17 are
At the position rotated by 180 degrees, the end edge of the holder 16 is brought into contact with the stop surface 22a of the stopper 22, and the stopper 22 is again positioned in an attitude tilted by the angle β.
In this state, lightly press the holders 16 and 17 and rotate the lever 8 to move the slide base 7 in the D direction, and use the inner tip 5a of the grindstone 5 to polish the other cutting edge _W2. . With the above work,
Both cutting edges W ₁ and W ₂ of the drill W are polished by coming into contact with the inner surface of the grindstone 5 slightly below the center at a constant angle β (see FIG. 3). By setting the angle β to approximately 15°, the cutting edges W ₁ and W ₂ of the drill W can be polished to an optimal angle and degree of curvature. Note that even if the diameter of the drill W changes, it can be held by the V-shaped holding surfaces of the holders 16 and 17. When the diameter of the drill changes, the position of the axis of the drill W in the held state moves as indicated by O ₁ or O ₂ on a line inclined by an angle β, as shown in FIG. Even if the drill diameter changes and the axis position changes in this way, both cutting edges W ₁ and W ₂ will continue to contact the inner surface of the grindstone 5 at an angle β slightly below the center of the grindstone 5, resulting in the optimal Polished to condition.

In the illustrated embodiment, the stopper 22 is provided on the side of the upper surface of the connecting plate 11c of the frame 11, but in another embodiment, a protrusion is provided on the side of the boss portion 14a of the disc 14, and one A stopper may be provided at an axially symmetrical position on the outer surface of the support plate 11b to abut against this protrusion, and the inclination angle β between the holders 16 and 17 may be set by this stopper. At the same time, a stopper is provided in the extending direction of the guide groove 14e of the disc 14, and this stopper allows the holders 16, 1
7, the slide stop position in the E-F direction may be determined.

As described above, according to the present invention, the frame body is provided on the slide base, the holder for holding the drill is rotatably provided on the support plate of the frame body, and the stopper stops the holder at a position rotated by 180 degrees. Since we have set
During drill polishing work, the holder is reliably positioned on the slide base, improving work efficiency and polishing accuracy. Further, even when the two cutting edges at the tip of the drill are being polished alternately, the work can be easily and reliably performed by rotating the holder.

In particular, since a rotating member is provided on the support plate of the frame and the holder is supported by this rotating member, the holder does not separate from the slide base like in the past, so there is no need to manually press the holder onto the slide base. This will make it easier to fix the drill.
Therefore, the holder does not shift from the slide base or float up due to the reaction force of the grindstone or rotational vibration during polishing, and reliable drill polishing can be performed. In addition, since the holder is held slidably a certain distance relative to the rotating member, when changing the polishing surface of the drill, the holder is removed from the stopper by sliding it, rotated 180 degrees by the rotating member, and then re-used. By bringing the holder into contact with the stopper, the holder can be easily set.

Further, each holder is formed with a holding surface, and the drill is held between the holding surfaces, and the holder is supported so as to be able to slide toward and away from the holding surface with respect to the rotating member. , and the holder is adapted to be stopped by the stopper in a state where the sliding direction is inclined with respect to the base. Therefore, as shown in Fig. 9, when the holder is stopped by the stopper, even if the diameters of the drills are different, the cutting edges of all the drills face in the same direction and are polished with the same conditions. It will be possible.

[Brief explanation of drawings]

The drawings show embodiments of the present invention.
The figure is a plan view of the drill grinder, Figure 2 is a front view of the drill grinder, Figure 3 is a front view showing the position of the grindstone and drill, Figure 4 is a cross-sectional view, and Figure 5 is a diagram of the drill holder. FIG. 6 is an exploded perspective view, FIG. 6 is a plan view of the drill holder, FIG. 7 is a side view of the drill holder viewed from the grindstone side, and FIGS. 8 and 9 are rotational movement diagrams of the holder. DESCRIPTION OF SYMBOLS 1... Base, 2... Motor, 5... Grindstone, 7... Slide base, 11... Frame, 11a, 11b... Support plate, 13, 14... Rotating member (disk), 13b, 1
4e...Guide portion for sliding the holder, 16,
17...Holder, 16, 16b, 17a, 17b...
Teeth forming a V-shaped holding surface, 18... Guide pin, 19... Holding metal fitting, 20... Guide screw,
22...Stoppa.

Claims (1)

[Scope of Claims] 1. A cylindrical grindstone is fixed to the rotating shaft of a motor installed on a base parallel to the top surface of the base, and a cylindrical grindstone is installed parallel to the top surface of the base on the base. slide base,
In a drill grinding machine that is capable of sliding at a fixed angle with respect to the rotating shaft, a drill is held on the slide base, and the drill cutting edge is brought into contact with the inner tip of the grindstone for grinding. , a frame body having a pair of support plates disposed perpendicularly to the slide base is provided on the slide base, and the frame body is rotatable about a support shaft perpendicular to the slide base; Each of the pair of support plates is provided with a rotating member, and
A slide guide portion is formed on this rotating member, and a pair of holders each having opposing holding surfaces are provided, and the drill is held between the holding surfaces, and both ends of each holder are connected to the slide guide portion. The holder is supported on the frame so that it can freely slide toward and away from each other, and the holder is stopped on the frame with the sliding direction tilted at a certain angle with respect to the horizontal and inverted at 180 degrees. A drill polishing machine characterized by being equipped with a stopper. 2. The drill polishing machine according to claim 1, wherein the drill holding surfaces of the pair of holders are formed in a V-shape.