JPH044093B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a rotation angle adjusting device for polishing a drill used for polishing the cutting edge of a drilling drill, drill-type milling cutter, etc. for use in ironwork or woodwork.

<Prior art> In general, the re-sharpening of the cutting edge of various drills as shown in FIG. It is necessary for the length to maintain accurate rotational symmetry with respect to the axis, and polishing has been done mainly by hand and relying on the operator's intuition.

Furthermore, as a drill polisher for holding and polishing a drill at an arbitrary angle of inclination and a predetermined rotation angle, one disclosed in Japanese Utility Model Application Publication No. 52-96490 is known.

<Problems to be Solved by the Invention> However, in conventional manual polishing, accurate polishing must rely on the senses of a skilled worker, which is not only inefficient, but also requires a large number of standardized dimensions. It is difficult to make the dimensions and cutting performance uniform, which is required for drills used in multi-axis drilling machines, etc., which use several drills at the same time, and it is inconvenient to use drills with uneven quality performance.

Furthermore, in the conventional rotation angle adjusting device shown in the above-mentioned publication, the angle is determined by making the member that adjusts the rotation angle when fixing the drill come into contact with a fixing dowel or the like at a fixed angle. The shape of the drill is complicated, high precision is required, the cost is high, and the angle adjustment member has to be replaced for each drill diameter and number of grooves. Furthermore, this type of angle adjusting member has the disadvantage that it can hardly be used with drills that do not have a circular cross section, such as a flat cone.

<Means for Solving the Problems> In the rotation angle adjusting device for drill polishing of the present invention, a housing 45 is mounted on a table so that its ends can swing up and down, and a holder shaft 49 is attached to the housing 45. In addition to being rotatably fitted,
A locking means for releasably locking the holder shaft 49 in a plurality of predetermined rotational positions is provided on the circumferential surface of the housing 45 and the holder shaft 49 side, and a drill 47 is always attached to the tip of the holder shaft 49. Chuck 5 that can be detachably gripped at the axis
1, a drill polishing holder device,
An insertion hole 71 through which the drill 47 is inserted is bored in the center, and push bolts 75 in multiple directions, the tips of which protrude toward the center of the insertion hole 71, are screwed into the peripheral wall. 4
7 and a dial ring 73 provided with a scale 77 indicating the rotation angle of the holder shaft 49; It is characterized by comprising a reference protrusion 63 that provides a reference for measuring the relative rotation angle of.

<Function> The drill 47 is fixedly held at the tip of the holder shaft 49 via the chuck 51 and concentrically with the shaft 49, and the protruding end of the drill 47 has a central insertion hole 7.
1, by inserting the dial ring 73 and screwing in the push bolts 75 by the same amount, the drill cross section and the position of the push bolts 75 are rotationally symmetrical to each other. A constant angular relationship is always maintained in the rotational drive relationship in at least one direction, and the relative angular relationship between the two is set constant. This relationship is always constant for drills of the same type, and the pressing angle with respect to the fixed rotary grindstone 1 is also determined.

At this time, depending on the number of drill holes, the housing 45
The locking means (positioning key 52 and keyway 46) of the holder shaft 49 is selected, and for example, the second drill can be locked at an equal angular position of 180°, and the third drill can be locked at an equal angle of 120°. put.

As a result, for a drill whose relative relationship is initially set as described above, it is necessary to read the value of the relative relationship between the scale 77 on the end face and the reference scale 65 in the state most suitable for drill polishing. For example, in the case of the second drill, rotate the drill 180° after polishing one side.
If you rotate it to set it and then polish the other edge in this state, both edges will be polished in perfect rotational symmetry.

Furthermore, for other drills of the same type, if the dial ring 73 is inserted into the drill fixed to the holder shaft 49, the relative angular relationship between the drill and the dial ring 73 has already been determined by the previous drill. Just set the drill rotation according to the same scale as the previously set scale and grind in the same way as in the previous case.

<Example> Figures 1 to 4 show a drill polishing holder device to which the rotation angle adjusting device of the present invention is applied. Can be attached and detached.

A fixed table 7 is provided at the bottom of the device, which is attached by the bolts 5. On the fixed table 7, a horizontal table 9, a vertical table 11, and a rotary table 13, which slide in the horizontal direction, are sequentially stacked. A movable table 15 is placed thereon. The fixed table 7 and the horizontal table 9 are connected by a horizontal dowel 17 facing in the horizontal direction, and the horizontal table 9 and the vertical table 11 are connected by a vertical dovetail 19 facing in the vertical direction so as to be slidable in the left-right or front-back direction, respectively. The rotary table 13 is placed on a flat surface on the vertical table 11, and its front end is pivotally supported by a vertical pin 21, so that the rotary table 13 can be rotated in the horizontal direction.

The left and right ends of the horizontal table 9 and the vertical table 11
An end plate 23 is fastened to each rear end to form a stopper for the slide of each table, and an adjustment screw 25 is screwed through the center of each end plate 23 to adjust the amount of slide of each table. It has an adjustable structure. Further, a slit 27 forming an arc centered on the pin 21 is bored in the rotary table 13, and a set bolt 29 made of a thumbscrew or the like is inserted into the slit 27.
is penetrated and screwed onto the vertical table 11, and by tightening and fixing this, the horizontal angle of the rotary table 13 is set.

On each left side of the fixed table 7 and the vertical table 11, a bearing part 31 having an axis in the thrust direction is fitted with a self-aligning bearing 33 made of a spherical bearing or a hoist-shaped roller bearing in the thrust direction. The self-aligning bearings 33, 33 are attached with screws 35 so as to protrude from each other, and the vertical axes of the self-aligning bearings 33, 33 are concentric.

Each bearing 33 has a rod-shaped device lever 3.
The lower ends of the levers 7 are fitted, and the upper bearing 33 is fitted so that the lever 37 does not slide in the thrust direction, and the lower bearing 33 is fitted so that the lever 35 can slide in the thrust direction. Therefore, when the upper end of the lever 37 is rotated in the front, back, left, right, or other arbitrary direction, the lever action of the lever 37 causes the vertical table 11 or the horizontal table 9, or both tables to slide back and forth or in the left and right direction, causing the top The position of the rotary table 13 is arbitrarily determined.

Further, the rear end of the rotary table 13 forms a radius along an arc centered on the pin 21, and a horizontal angle scale 39 is engraved here, and a reference scale engraved on the vertical table 11 is engraved here. (not shown) so that the rotation angle of the rotation table 13 can be read.

At the left and right ends of the rear position on the rotary table 13, there are two
Book supports 41 and 43 are mounted so as to face each other and stand upright, and between the support posts 41 and 43, a housing 45 made of a hollow rectangular parallelepiped is rotatably attached to the support shaft 4.
A holder shaft 49 for inserting and supporting a drill 47 is rotatably inserted into the housing 45 and supported by the holder shaft 4.
9 is fixedly fastened and supported through a chuck 51 at the front end of 9 so that the protrusion length can be adjusted.

The chuck 51 includes a ring-shaped lock nut 56 that is screwed onto the outer periphery of the tip of the cylindrical holder shaft 49;
A thrust ring 60 is rotatably positioned and fitted inside the front end, and has an inner peripheral surface forming a tapered surface that expands rearward, and an outer peripheral surface of the front end has a tapered surface that matches the inner surface of the thrust ring 60, The rear part consists of a sleeve-shaped collet 58 forming a tapered surface that matches the tapered surface that widens forward on the front inner circumference of the holder shaft 49. As described above, the front end outer periphery and the rear outer periphery of the collet 58 are both tapered in opposite directions, and a large number of grooves 58a are formed alternately from the front and rear on the circumferential wall.
is cut, and when the rear end is inserted into the holder shaft 49 and the lock nut 56 is screwed in, the inner diameter of the collet 58 contracts uniformly due to the pressure from the inner peripheral surfaces of the lock nut 56 and the holder shaft 49, and when loosened, it expands. Ru. Due to this action, when the drill 47 is inserted into the collet 58 and the lock nut 56 is operated, the drill 47 is tightened uniformly around the entire circumference regardless of the gripping position, and the axial center is also determined.

The holder shaft 49 is rotatably supported by bearings 62, 62 at the front and rear ends of the housing 45, and a length adjustment screw 64 is screwed into the center of the inside of the holder shaft, so that the rear end of the drill 47 inserted into the inside of the holder shaft is screwed into the center of the holder shaft. It is a mechanism that allows you to adjust the insertion depth.

Holder shaft 4 protruding from the rear end of the housing 45
A positioning ring 48 having one keyway 46 carved at symmetrical positions on the circumference and a handle ring 50 for rotating the holder shaft 49 are integrally fitted and fixed to the protruding end of the housing 45 at the rear of the upper surface of the housing 45. At the center of the end, a hook-shaped positioning key 52 that removably engages with the keyway 46 is pivotally supported so as to be rotatable in upward and downward directions, and 54 is mounted on the housing so as to pivotally support the positioning key 52. With the key plate
A magnet 42 may be fixed to the upper surface of the positioning key 52 so as to maintain the positioning key 52 in an upright position. The keyway 46 and the positioning key 52 are means for locking the holder shaft 49 to the housing 45.

The housing 45 has a rotation angle of at least 90° about the support shaft 44, and rotates from an upwardly oriented upright position to
Rotate until it faces horizontally forward. A stopper pin 53 is protruded from the rear end of the right side of the housing 45, and when the housing 45 is upright, the stopper pin 53 is connected to the right column 43.
The structure is such that it stops when it comes into contact with the rear surface of the machine. Further, a prismatic mounting plate 55 is vertically fixed to the front end of the right side of the housing 45, and an angle adjustment screw 57 whose tip protrudes rearward is attached to the lower end of the mounting plate 55.
is screwed in, and the rear protruding end of the angle adjustment screw 57 or the rear surface of the mounting plate 55 comes into contact with the front surface of the support column 43, so that the housing 45 is stopped in a forward tilted state. Therefore, by adjusting this angle adjustment screw 57, the housing 45
And the forward tilt angle of the holder shaft 49 is adjusted and set.

On the other hand, the housing 45 by the adjustment screw 57
The rotation angle is set using an angle scale plate 59 fixed inward to the inner surface of the left column 41 and the housing 4.
Pointer 6 fixed upright on the left end of the top surface of 5
1, it is a mechanism that allows you to adjust the indicated angle while looking at it.

Further, a shaft-shaped reference protrusion 63 is provided on the front surface of the mounting plate 55 at the same height as the holder shaft 49 and extends parallel to the holder shaft 49. Direction reference scale 6
5 is engraved on the reference protrusion, and a sleeve-shaped balance weight 67 is slidably fitted into the reference protrusion and set at an arbitrary position by a set screw 69 screwed in from the circumferential surface.

On the other hand, an insertion hole 71 is drilled in the center of the drill 47 which is made to protrude from the chuck 51 to a fixed size.
A dial ring 73 having equiangular graduations 77 that are rotationally symmetrical on the front periphery is inserted. Two push bolts 75 are screwed into the rear circumferential wall of the dial ring 73 from symmetrical positions toward the centripetal direction, and the push bolts 75 press or contact the drill 47, whose cross section is rotationally symmetrical, as shown in FIG. This provides a mechanism for holding the dial ring 73 itself on the axes of the drill 47 and the holder shaft 49.

The end face of the dial ring 73 inserted and set into the drill 47 as described above and the end face of the reference protrusion 63 are substantially on the same plane, and the scale 77 corresponds to the reference scale 65. Then, the longitudinal and lateral positions of the holder device corresponding to the rotary grindstone 1 and the lateral and vertical directions of the holder shaft 49 are adjusted in accordance with the angles of several types of polishing surfaces in two symmetrical directions of various drills whose cross sections are symmetrical or rotationally symmetrical. Set the angle. At this time, the horizontal rotation angle of the rotation table 13 is also adjusted and set as required.

Next, when the rotation angle of the drill 47 is adjusted, the correspondence between the reference scale 65 and the scale 77 is determined, so the handle ring 50 and the positioning ring 48 are adjusted at that position.
The rotation angle of the drill 47 with respect to the holder shaft 49 is determined, and the positioning key 52 is engaged with the keyway 46 to set the rotation angle of the drill 47.

Next, the housing 45 is tilted forward from the upright state, and the horizontal table 9 and the vertical table 11 are moved left and right using the operating lever 37, while the tip of the drill 47 is sequentially rotated by the rotary grindstone 1.
Polishing is performed by pressing it against the circumferential surface of the At this time, the drill 47 is connected to the housing 45 and the balance weight 67.
Although it naturally tilts forward due to its own weight, it stops at the angle set by the angle adjustment screw 57, and the polishing of one polishing surface is completed.

In the next step, the positioning key 52 is removed, the drill 47 and the holder shaft 49 are rotated 180 degrees, the positioning key 52 is engaged and set in the other key groove 46, and the same polishing as described above is performed again. There is almost no need to adjust the slide of the movable table using the operating lever 37. By this operation, if the cross section and the cutting edge are symmetrical at two points, the polishing of the polished surface is completed.

In addition to the usage described above, it is also possible to determine the position and orientation of the drill 47 and press the drill 47 against the rotating grindstone 1 while swinging the housing 45 from top to bottom or from top to bottom for polishing. It is.

If the cross section of the drill 47 is triangular, hexagonal, or has three spirals like a three-eyed drill, it is desirable to prepare a dial ring 73 with three directions for the push bolt 75 as well. Furthermore, if the cutting blade is a third one, it is desirable that the scale 77 of the dial ring 73 be rotationally symmetrical and divided into three equal parts, and correspondingly, the key groove 46 of the positioning ring 48 should also be divided into three equal parts. It is desirable to arrange them at equal angular positions.

Further, the forward tilting action of the housing 45 during drill polishing is not only caused by the load of the balance weight 67 as shown in the figure, but also by attaching a weak helical spring to the support shaft 44, or by attaching the lower end of the mounting plate 55 to the movable table 1.
It is also possible to use the restoring action of the spring by installing a weak coil spring (none of which is shown) or the like between it and the top surface of the spring.

Figure 6 shows the dial ring 7 for drills with flat cross section and cross cross section as shown in Figure 7 C and D.
3 is set and the scale at a predetermined angle is read. Since both of these have rotationally symmetric cross sections in two directions, the scale 77 and the keyway 4 are
6 and the push bolt 75 are both linearly symmetrical or rotationally symmetrical in two directions.

In addition to the above, drills with rotationally symmetric or line symmetric cross sections in multiple directions, such as triangular or hexagonal cross sections, can be easily accommodated by changing the number and angle of the push bolts 75 and the scale 77 of the dial ring 73. I can do it.

<Effects of the Invention> As a result of the present invention configured as described above, the rotation angle of the holder shaft 49 can be freely selected and determined by the locking means provided between the holder shaft 49 and the housing 45.
Any polishing angle can be obtained, and the dial ring 73 and reference protrusion 63 allow the rotation angle during drill polishing to be determined on an accurate scale. It is possible to polish a large number of items by simply rotating them one after another by a certain angle. In other words, by setting the angle once, you can continuously polish any number of drills of the same type with the same length and diameter, which improves work efficiency and ensures a uniform re-polishing finish, and even an amateur can compare the drills once the shape of the drill tip is determined. It has the advantage of being easy and accurate to polish.

In addition, since the drill angle can be set within the range that can be accommodated by the locking means, the locking means can have a structure that allows for a wide variety of increments, and the dial ring can be set within the size of the drill insertion hole. It has the advantage of being able to handle various types of polishing for many types of drills within the applicable range and range of the scale.Furthermore, the dial ring has a simpler structure compared to conventional angle adjustment members of this type, and other than the scale It has many features such as low manufacturing cost and easy operation since it does not require particularly high precision.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view of the device showing one embodiment of the present invention, Fig. 2 is a left and right side view showing the installation state, Fig. 3 is a rear view of the device, and Fig. 4 is a view of the holder shaft of the device. 5 is a sectional view showing the structure around the shaft; FIG. 5 is an end view of the main parts showing a method for reading and adjusting the rotation stop position (angle) of the drill using the device of the present invention;
6A and 6B are end views showing the angle adjustment state of another drill, and FIG. 7 is an end perspective view showing the types of the cutting edge structure of the drill. 1: Rotating grindstone, 3: Polishing machine table, 5: Bolt, 7: Fixed table, 9: Horizontal table, 11:
Vertical table, 13: Rotating table, 15: Movable table, 17: Horizontal, 19: Vertical, 21: Pin, 23: End plate, 25: Adjustment screw, 27: Slit, 29: Set bolt, 31: Bearing part , 33:
Bearing, 35: Screw, 37: Operation lever, 39: Horizontal angle scale, 41, 43: Support column, 44: Support shaft, 4
5: Housing, 46: Keyway, 47: Drill,
48: Positioning ring, 49: Holder shaft, 5
0: Handle ring, 51: Chuck, 52: Positioning key, 53: Stopper pin, 54: Key plate, 55: Mounting plate, 57: Angle adjustment screw, 59: Angle scale plate, 61: Pointer, 63: Reference protrusion, 65 : Reference scale, 67: Balance weight, 69: Set screw, 71: Insertion hole, 73: Dial ring, 75: Push bolt, 77: Scale.

Claims (1)

[Scope of Claims] 1. A housing 45 is mounted on a table so that its ends can swing up and down, and a holder shaft 49 is rotatably fitted into the housing 45, and the housing 45 and the holder shaft 49 are A locking means for releasably locking the holder shaft 49 in a plurality of predetermined rotational positions is provided on the side peripheral surface, and a drill 4 is provided at the tip of the holder shaft 49.
A drill polishing holder device is provided with a chuck 51 that removably holds the drill 7 at its axis, and an insertion hole 71 through which the drill 47 is inserted in the center.
A multi-directional push bolt 75 is provided in the peripheral wall, the tip of which protrudes toward the center of the insertion hole 71.
A scale 7 indicating the rotation angle of the drill 47 and the holder shaft 49 is provided on the tip surface or peripheral surface.
7 attached thereto, and a dial ring 73 with a tip protruding from the housing 45 side so as to be close to the end surface or circumferential surface of the dial ring 73, and the housing 45
A rotation angle adjustment device for drill polishing, which comprises a reference protrusion 63 that provides a reference for measuring the relative rotation angle of the drill 47 and dial ring 73. 2 The locking means is the housing 45 and the holder shaft 4.
Claim 1 consisting of a positioning key 52 provided on the 9 side and a plurality of key grooves 46 that removably engage with the positioning key 52 at a fixed position.
Rotation angle adjustment device for drill polishing as described in .