JPS61125758A - Rotational angle adjusting device for grinding drill - Google Patents

Abstract

PURPOSE:To enhance the efficiency by providing a plurality of push bolts, to retain a drill at a constant angle, with a constant spacing in the circumferential wall of a drill insert hole in the center of a dial ring marked at its facade with a scale to represent the rotation angle of drill and by making uniform the re-grinding with angle setting at one time. CONSTITUTION:The position of a holder device in terms of directions as well fore and aft as to the left and right in correspondence to a grinding wheel 1 and also the angle of a holder shaft 49 in the directions as well to the left and right as up and down are set in compliance with the angles of the drill ground surface in different types in bisymmetrical direction. Then the correlationship between the reference line 55 and graduation 77 is determined with the rotational angle of drill 47 put in agreement, and the rotational angles of a handle and locating rings 50, 48 with respect to the holder shaft 49 are determined to make engagement of a locating key 52 in a key seat 46 and setting of the rotational angle of drill 47, and a housing 45 is tilted forward from the upright state as well as the drill 47 is pressed to the grinding wheel 1 while a control lever 37 is moving a transverse 9 and a longitudinal 11 table to the left and right, and now grinding is performed. In the following process, the key 52 is removed and the drill 46 and holder shaft 49 are turned 180 deg. to set in the key seat 46 to be followed by grinding in the same manner, and thus bisymmetrical grinding is finished.

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, re-sharpening of the cutting edge of various drills as shown in Fig. 7 is performed to ensure that the center of the cutting blade is accurate and that the inclination angle of each part (for example, rake angle, undercut angle, thinning angle, etc.) It is necessary to maintain accurate rotational symmetry in length, and polishing has been done mainly by hand and relying on the operator's intuition.

In addition, if the type of polishing surface is a single type and only a simple flat surface or a radiused surface that matches the circumferential surface of the whetstone is required, it is sufficient to determine the angle and position of the drill in advance and press it against the whetstone.
A simple drill-hole device was used that held the drill at a fixed angle and at a fixed height.

<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 multiple drills at the same time, and it is inconvenient to use drills with uneven quality performance.

In particular, the position at which the rotation of the drill is locked when polishing a drill directly affects the polishing of the cutting edge, and in this case, the rotation angle of the drill itself is measured visually based on the rotation angle of the chuck that grips the drill. Since they did not necessarily match, it was insufficient to polish the tip accurately and uniformly.

<Means for Solving the Problems> The rotation angle adjusting device for drill polishing of the present invention has an 8! In the structure, an insertion hole is drilled in the center part for concentrically inserting the drill and holding it fixedly, and the tip is pressed against the peripheral wall of the insertion hole so as to hold the drill at a constant angle. A plurality of pusher bolts are provided at equal angular intervals, a dial ring is provided on the front end surface or the circumferential surface with a scale indicating the rotation angle of the drill, and the front end surface of the housing corresponds to the scale of the dial ring. It is characterized by a protruding reference axis with a reference scale attached to it.

<Function> The drill 47 is fixedly held at the tip of the holder shaft 49 and concentrically with the shaft 49 via a chuck or the like.
By inserting the dial ring 73 into the protruding end of 7 through the central insertion hole 71 and screwing in the bushe bolts 75 by the same amount, the drill cross section and the position of the bushe bolts 75 are rotationally symmetrical and are equal to each other.
The dial ring 73 always maintains a constant angular relationship with respect to the drill 47 in at least one direction of rotational drive, 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.

As a result, for a drill whose relative relationship was initially set as above, it is necessary to read the value of the relative relationship between the end face scale @77 and the reference scale 65 in the most suitable state for drill polishing. For example, in the case of a second drill, after polishing one, rotate the drill 180° and set it, and then polish the other tip in that state, so that both eyes will be polished in perfect rotational symmetry. Ru.

Furthermore, for other drills of the same type, if the dial ring 73 is made thinner on 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. , set the drill rotation to the same scale as the previously set scale,
It can be polished 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 attached by the port 5 is provided at the bottom of the device, and on the fixed table 7 are horizontal tables 9g and vertical tables 11 that slide in the horizontal direction.
A movable table 15 made up of nine rotating tables 13 stacked one on top of the other is mounted. 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 the front end of the rotary table 13 is fixed with a vertical bottle 21, so that the rotary table 13 can be rotated in the horizontal direction. It is structured as follows.

At the left and right ends of the horizontal table 9 and at the rear end of the vertical table 11, respectively! The Ii plate 23 is tightened 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, so that the sliding amount of each table can be adjusted. be. In addition, the rotary table 13 has a slit 2 that forms an arc centered on the bottle 21, and a set bolt 29 made of a thumbscrew or the like is passed through this slit and screwed onto the vertical table 11. By tightening and fixing, the rotating table 13
The horizontal angle of is set.

On each left side of the fixed table 7 and the vertical table 11, there is a bearing part 31 with a finely tuned thrust direction, in which a self-aligning bearing 33 made of a spherical bearing or a hoop-shaped roller bearing is fitted in the thrust direction. Each self-aligning bearing 33.33 is attached with a screw 35 so as to protrude.
The fine lines in the vertical direction are concentric.

The lower end of a rod-shaped device lever 37 is fitted into each of the bearings 33, and the upper bearing 33 is designed to prevent the lever 37 from sliding in the thrust direction.
A lever 35 is fitted into each of the levers 3 so as to be slidable in the thrust direction. Therefore, when the upper end of the lever 37 is rotated in any direction such as front, rear, left, right, etc., the lever 37
By the lever action of 7, the vertical table 11 or the conventional table 9
, or both of the mechanism tables slide in the front-rear direction or left-right direction, and the position of the uppermost rotary table 13 is determined arbitrarily.

Further, the rear end of the rotary table 13 forms a radius along an arc centered on the bin 21, and a horizontal square mark @39 is engraved here, and a reference mark engraved on the vertical table 11 Rotating table 13 corresponds to the eye area (not shown).
The structure allows the rotation angle to be read.

Two columns 41.43 are attached to the left and right ends of the rear position on the rotary table 13 so as to face each other and stand upright, and between the columns 41.43, a housing 45 made of a hollow rectangular parallelepiped is rotatable. A holder shaft 4 is freely supported by a support shaft 44, and a drill 47 is inserted and supported in the housing 45.
The drill 47 is fixedly supported via a chuck 51 at the front end of the holder shaft 49 so that its protrusion length can be adjusted.

The chuck 51 has a ring-shaped lock nut 56 that is screwed into the outer periphery of the tip of the cylindrical holder pongee 49, and a thrust lock nut 56 that is rotatably positioned and fitted inside the front end of the lock nut 56, and whose inner circumferential surface forms a tapered surface that expands backward. ring 60 and
It consists of a sleeve-shaped collet 58 whose front end outer periphery forms a tapered surface that matches the inner surface of the thrust ring 60, and whose rear end forms a tapered surface that matches the forwardly expanding tapered surface of the front inner periphery of the holder shaft 49. ing.

As mentioned above, the front end outer periphery and the rear outer periphery of the collet 58 both form opposite tapers, and a large number of grooves 58a are cut around them alternately from the front and rear, and the rear end is connected to the holder shaft 49. When the collet 58 is inserted and the lock nut 56 is screwed in, the inner diameter of the collet 58 is uniformly contracted by the inner peripheral surfaces of the lock nut 56 and the holder shaft 49, and when it is loosened, it is expanded. Due to this action, the drill 4 is inserted into the collet 58.
7 is inserted 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 and 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, so that the rear end of the drill 47 inserted into the inside hits the holder shaft 49. It is a mechanism that allows you to adjust the insertion depth.

At the protruding end of the holder shaft 49 that protrudes from the rear end of the housing 45, a positioning ring 48 having one keyway 46 carved in each side at symmetrical positions and a handle ring 50 for rotating the holder shaft 49 are integrated. Fitted and fixed, hashing 45
A hook-shaped positioning key 52 that removably engages with the key groove 46 is rotatably supported rearward at the center of the rear end of the upper surface. A magnet 42 may be fixed to the top surface of the key plate attached to the top so as to maintain the positioning key 52 in an upright position.

The housing 45 has a diameter of at least 690 around the support shaft 44.
The housing 45 has a rotation angle of 1.5" and rotates from an upright position facing upward to a horizontal forward facing position. A stopper bin 53 is protruded from the rear end of the right side of the housing 45, and the housing 4
5 stands upright, the stopper pin 53 comes into contact with the rear surface of the right column 43 and stops. 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 screwed into the lower end of the mounting plate 55. When the rear surface of the protruding end or mounting plate 55 comes into contact with the front surface of the support column 43, the housing 45 is stopped in a forward tilted state. Therefore, by adjusting the angle adjustment screw 57, the forward tilt angle of the housing 45 and the holder shaft 49 can be adjusted.

Ikegata, the rotation angle of the housing 45 is set by the adjustment screw 57 using the angle scale plate 59 fixed inward to the inner surface of the left column 41 and the angle scale plate 59 fixed upright to the left end of the center of the T-plane of the housing 45. The pointer 61 provides a mechanism for adjusting the indicated angle while looking at it.

Further, a reference shaft 6 is provided on the front surface of the mounting plate 55 at the same height as the holder shaft 49 and parallel to the holder shaft 49.
3 is provided protrudingly, and a reference date wt65 in the horizontal direction is engraved in the center of the front end surface of the reference shaft 63, and a sleeve-shaped balance weight 67 is slidably fitted to the shaft. It can be set at any desired position by means of a set screw 69 inserted in h.

On the other hand, a dial ring 73 having an insertion hole 71 in the center and rotationally symmetrical equiangular eyes Wt7 on the front periphery is inserted into the drill 47 which is projected to a fixed size from the chuck 51. . Two push bolts 75 are screwed into the rear circumferential wall of the dial ring 73 from symmetrical positions in the centripetal direction, and the push bolts 75 press or hold the drill 47, whose cross section is rotationally symmetrical, as shown in Figure f55. A mechanism is provided for holding the gouillage ring 73 itself on the axes of the r handle 4 and the holder shaft 49 through contact.

The end face of the dial ring 73 inserted and set in the drill 47 as described above and the end face of the reference 111+63 are substantially on the same plane, and the scale 77 corresponds to the reference #f155. 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 line 55 and the scale 77 is determined, so the rotation angle of the handle ring 50 and the positioning ring 48 with respect to the holder shaft 49 is determined at that position, and the positioning key 52 is inserted into the key groove. 46 to set the rotation angle of the drill 47.

Next, the housing 45 is tilted forward from the erected state, and while the horizontal table 9 and the vertical table 11 are moved left and right using the operating lever 37, the tip of the drill 47 is sequentially pressed against the circumferential surface of the rotating grindstone 1. and polish it. At this time, the drill 47 naturally tilts forward due to the weight of the housing 45 and the balance weight 67, but stops at the angle set by the angle adjustment screw 57, completing the polishing of one polishing surface.

In the next step, the positioning key 5''l 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. At this time, it is almost unnecessary 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 polishing surface is completed.

In addition to the above usage, determine the position and orientation of the drill 47,
It is also possible to grind by pressing the drill 47 against the rotating whetstone 1 while swinging the housing 45 from top to bottom or from top to bottom.

If the cross section of the drill 47 is triangular, hexagonal, or has three helical threads as in the case of a three-eyed drill, the push bolt 75 can also be prepared with a dial ring 73 arranged in three directions. Preferably, if the cutting blade has a third eye (Earth FX, t, correspondingly, the eye Wt of the Guyar ring 73, a rotationally symmetrical one with 11 equally divided beads is desirable, and correspondingly, the positioning ring 48 It is desirable that the key grooves 46 are also arranged at equal angular positions divided into three equal parts.

Further, the forward tilting action of the housing 45 during drill polishing is caused by the load of the balance weight 67 as shown in the example shown, as well as by the support shaft 4.
Attach a weak helical spring to 4, or attach a weak helical spring to mounting plate 5.
It is also possible to provide a weak fill spring (none of which is shown) or the like between the lower end of the movable table 15 and the upper surface of the movable table 15 to utilize the restoring action of the spring.

FIG. 6 shows a state diagram when the dial ring 73 is set for a drill with a flat cross section and a cross section as shown in FIGS. 7(C) and (D), and the scale at a predetermined angle is read. Since these all have rotationally symmetric cross sections in two directions, the eye r/it 77, the keyway 46, and the push bolt 75 are all linearly symmetrical or rotationally symmetrical in two directions.

In addition to the above, drills with rotationally symmetrical or i-symmetrical 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. be able to.

<Effects of the Invention> As a result of this invention being constructed as described above, the holder shaft 49
Since the rotation angle of the drill can be determined freely, any polishing angle can be obtained.Dial ring 73 and reference shaft 63 allow the rotation angle during drill polishing to be determined on an accurate scale. By setting the angle once, it is possible to polish a large number of items, especially when polishing the same type of polishing, simply by sequentially rotating the polisher by a fixed angle. In other words, by setting the angle once, multiple drills of the same type with the same length and diameter can be polished in succession, which improves work efficiency and ensures a uniform re-polishing finish. It has the advantage of being relatively easy and accurate to polish.

[Brief explanation of the drawing]

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. A cross-sectional view showing the structure around the pongee, Figure @5 is an end view of the main part showing the method of reading and adjusting the rotation stop position (angle) of the drill using the device of the present invention, and Figures 6 (A) and (B) are the same. FIG. 7 is an end view showing the angle adjustment state of the drill, and FIG. 7 is an end perspective view showing the types of the cutting edge structure of the drill. 1: Rotary 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: Bin 23: End plate 25:
W4 setting screw 27: Slit 29: Set bolt 31: Bearing part 33: Bearing
35: Screw 37: Operation lever 39:
Horizontal angle scale 41.43: Post 44: Support shaft 45: Housing 46: Keyway 47:
Drill 48: Positioning ring 49: Holder shaft 50: Handle ring 51: Chuck 52: Positioning key 53: Stopper bottle 54: Key plate 55: Mounting plate 57
: Angle adjustment screw 59: Angle index plate 61:
Pointer 63: Reference axis 65: Reference scale 6
7: Balance weight 69: Set screw 71:
Insertion hole 73: Dial ring 75:
Push bolt Fig. 3 Fig. 4 Fig. 5 Fig. 6 (A) (B) Fig. 7

Claims (1)

[Claims] 1) In a mechanism in which a housing is supported on a table through which a holder shaft for holding a drill is rotatably inserted at the tip, an insertion hole is drilled in the center for concentrically inserting the drill and holding it fixedly. A plurality of push bolts are provided at equal angular intervals on the peripheral wall of the insertion hole, the tips of which are pressed so as to hold the drill at a constant angle, and the front end surface or peripheral surface indicates the rotation angle of the drill. A rotation angle adjusting device for drill polishing, comprising: a dial ring having a scale; and a reference shaft having a reference scale corresponding to the scale of the dial ring protruding from the front end of the housing.