JP4305877B2 - Drill blade grinder - Google Patents

Description

  The present invention relates to a drill blade grinder, and more particularly, to a tool for polishing a drill blade having a pair of cutting blades and a flank surface that is formed at a tip portion thereof.

Conventionally, drill blades that have been worn out and have reduced cutting ability have been re-polished by attaching a disk-shaped grindstone to a motor and bringing the drill blade into contact with a rotating grindstone.

However, since re-polishing of the drill blade requires considerable experience and skill, the drill blade is often disposable.

On the other hand, there is, for example, Patent Document 1 as an apparatus that can re-grind a drill blade without requiring skill.

JP2006-312220

  However, the apparatus as described in Patent Document 1 is large and costly, and the drill blade cannot be easily polished.

  Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a drill blade grinder that can easily grind a drill blade even if it is not experienced and skilled. To do.

In order to solve the above-mentioned problem, the drill blade grinder according to claim 1 is a drill blade grinder for polishing a drill blade having a pair of cutting blades and a flank surface formed on the tip portion. There,
A grindstone that can be rotated by being inserted through a rotating shaft connected to the driving means, and that can be ground by abutting one of the cutting blades and the flank that follows,
A guide ruler that stably supports the other cutting edge from below;
Each of the mounting plates having a mounting surface that is inclined inward and has a mounting surface for forming a trough for mounting the shaft portion of the drill blade has a substantially comb shape in plan view, and the shaft of the drill blade. A pair of drill blade pedestals arranged so as to be engaged with each other so that the depth of the valley portion can be adjusted by moving in a direction perpendicular to the direction and away from each other
The drill blade pedestal is elastically provided via a spring, and the drill blade pedestal is slid in the axial direction of the drill blade and in the direction close to the grindstone against the elastic force of the spring. The gist is that the drill blade is polished.

According to a second aspect of the present invention, there is provided the drill blade grinder according to the first aspect, wherein the grindstone has a cylindrical shape that passes through the rotation shaft at the axis position, and the rotation shaft is an axis of the drill blade. The gist is that they are arranged at a predetermined angle (α) in plan view with respect to the direction.

According to a third aspect of the present invention, there is provided the drill blade grinder according to the first aspect, wherein the grindstone has a disk shape with a rotating shaft inserted through a central position, and the grindstone polishing surface has a drill blade surface. The gist of the invention is that it is disposed at a predetermined angle (β) in a plan view with respect to the axial direction and at a predetermined angle (γ) with respect to a horizontal plane.

According to a fourth aspect of the present invention, there is provided the drill blade grinder according to any one of the first to third aspects, wherein a presser portion is provided above the mounting plate so as to be connected to the shaft portion of the drill blade. The gist is that the fastening force is applied obliquely from above.

Further, a drill blade grinding machine according to a fifth aspect is characterized in that, in the configuration according to any one of the first to fourth aspects, an electric drill body to which a drill blade is attached is used as the driving means.

  The drill blade grinder according to the present invention is a drill blade grinder for polishing a drill blade having a pair of cutting blades and a flank that is formed at the tip thereof, in the axial direction of the drill blade. A grindstone that is disposed at a predetermined angle with respect to the rotary shaft connected to the driving means, is rotatable, and is capable of polishing by abutting one of the cutting blades and the flank that follows, With a guide ruler that stably supports the other cutting blade from below, and a large number of mounting plates that have a mounting surface that is inclined inward and forms a trough that mounts the shaft portion of the drill blade. Each has a substantially comb shape in plan view, and moves in a direction perpendicular to the axial direction of the drill blade so as to move away from or approach each other so that the depth of the valley can be adjusted. A pair of drill blade holders, Is drilled through a spring, and the drill blade pedestal is slid in the axial direction of the drill blade and in the direction close to the grindstone against the elastic force of the spring to polish the drill blade. Thus, even a person who has no experience and skill can easily polish the drill blade. In addition, it is compatible with a wide range of drill blade shaft diameters and has excellent portability.

As shown in FIGS. 17 (a) and 17 (b), the drill blade targeted by the present invention has a shaft portion (51) having a spiral groove (52) and a pair of cutting blades (55a) at the tip portion (54). ), (55b) and the following flank faces (56a), (56b). FIG. 17A is a side view showing the drill blade, and FIG. 17B is a front view showing the drill blade.
One cutting edge (55a) and flank (56a) and the other cutting edge (55b) and flank (56b) are usually provided with a tip angle of approximately 120 degrees. The flank surfaces (56a) and (56b) may be partially cut off as necessary.
The drill blade may be used for any purpose such as for woodworking, for concrete, for ironwork, and for stainless steel.

As a driving means for rotationally driving the grindstone, for example, a household power supply (AC100V)
A known motor such as a drive motor using a power source can be used without limitation. In particular, it is preferable to use an electric drill main body on which a drill blade is mounted as the driving means, since the weight of the instrument itself can be reduced and it is suitable for carrying. In this case, the portion protruding from the grindstone of the rotary shaft may be formed in a suitable shape so that it can be firmly fastened by the chuck of the electric drill body.

  A leaf spring is optimal as a spring for elastically mounting the drill blade cradle from the viewpoint of space saving or the like, but a coil spring or other elastic body may be used.

  An embodiment of the present invention will be described with reference to FIGS. 1 to 8 (a) and 8 (b) and FIGS. 17 (a) and 17 (b). 1 is an exploded perspective view of a drill blade grinder, FIG. 2 is a plan view of the drill blade grinder, FIG. 3 is a side view of the drill blade grinder, FIG. 4 is a side view of the drill blade grinder, and FIG. FIG. 6A is a plan view of the drill blade grinder, FIG. 7A is a bottom view of the drill blade grinder, FIG. 7B is a cross-sectional view taken along the line A-A ', and FIG. a) is a bottom cutaway view of the drill blade grinder, FIG. 8B is a cross-sectional view taken along line B-B ′, FIG. 17A is a side view showing the drill blade, and FIG. 17B is a front view showing the drill blade. FIG.

As shown in FIGS. 1-5, the drill grinder (1) according to the present embodiment includes a bottom plate (2), a grindstone (3), a guide ruler (4), and a drill blade base (5a) ( 5b), a slide body (6), and an interposition body (7).

As shown in FIGS. 1 to 2 and 6, the grindstone (3) has a cylindrical shape, and the rotating shaft (10) is inserted through the axial center position thereof. As shown in FIG. 6, the grindstone (3) is screwed to the rotating shaft (10) via a bolt (10a), and is driven by driving means (not shown) connected to the rotating shaft (10). It is configured to be rotatable.
As shown in FIG. 2, the grindstone (3) is disposed such that the rotation axis (10) forms a predetermined angle α (generally 60 degrees) with respect to the axial direction X of the drill blade (50). The cutting blades (55a) and (55b) of the drill blade (50) and the subsequent flank (56a) and (56b) (see FIGS. 17 (a) and (b)) are polished. As shown in FIGS. 1-4, the cover body (11) fixedly mounted on the bottom plate (2) is covered.
By using such a cylindrical grindstone (3), it becomes possible to improve the wear resistance. However, the cover body (11) is designed so that the grindstone (3) can be easily replaced. The part is preferably configured to be openable and closable.

  The guide ruler (4) is fixedly installed at an appropriate position on the bottom plate (2) adjacent to the grindstone (3), as shown in FIGS. The guide ruler (4) stably supports the edge (58) (see FIGS. 17 (a) and (b)) of the cutting edge of the drill blade (50) from below, and has a support surface (12) on the top. is doing. As shown in FIG. 4, the support surface (12) is disposed so as to form a predetermined angle (generally 20 degrees) with respect to the horizontal plane.

As shown in FIGS. 1 to 2, the drill blade cradle (5a) (5b) is formed in a substantially comb shape in plan view by a large number of mounting plates (15). ) In a direction perpendicular to the axial direction X of the drill blade (50) along the locking piece (21) and the guide projection (22) (described later) on the slide body (6). It arrange | positions so that it can move symmetrically. As shown in FIG. 1, the mounting plate (15) is inclined inward, and a mounting surface (16) for mounting the shaft portion (51) of the drill blade (50) is formed. . Further, as shown in FIGS. 7B and 8B, the mounting plate (15) is disposed and fixed by a plate-shaped material having a substantially U-shape in cross section.

As shown in FIGS. 1 and 5, the slide body (6) has a fitting portion (20) that is fitted to a side plate (2 a) that is erected on the left and right sides of the bottom plate (2). A screw (2c) that passes through a long hole (2b) provided in the bottom plate (2) is screwed into a screw hole (20a) of the fitting portion (20) (see FIGS. 7A and 8A). By doing so, the slide body (6) is disposed so as to be slidable by a predetermined length in the front-rear direction with respect to the bottom plate (2).
As shown in FIG. 1, FIG. 3, and FIG. 4, a locking groove (17) and a guide groove ( 18), the locking piece (21) and the guide projection (22) corresponding to each of the projection projections (22) are projected, and the engagement projections (35a) (35b) provided at the center of the bottom of the drill blade base (5a) (5b). ) (Refer to FIG. 7B and FIG. 8B), left and right laterally cutout holes (23) are formed.
Further, as shown in FIG. 1, the dial (26) and the gear (27) can be rotated up and down across the slide body (6) through the screw (28) inserted through the screw hole (24). It is worn.

As shown in FIGS. 1, 7 (a), and 8 (a), the interposer (7) is arranged at the front and rear in the recess (20 b) formed by the fitting portion (20) of the slide body (6). The toothed portion (30) that meshes with the gear (27) and extends linearly in the front-rear direction, and provided at the center of the bottom of the drill blade base (5a) (5b). Engaging grooves (31a) (31b) that are engaged with the lower ends of the engaging protrusions (35a) and (35b) and are symmetrically provided in a predetermined shape in a plan view. As shown in FIGS. 7B and 8B, the engaging protrusions (35a) and (35b) each have a shape in which the lower end is reduced in diameter.

When polishing the drill blade (50), as shown in FIGS. 7 (b) and 8 (b), troughs formed by the opposing mounting surfaces (16) of the drill blade pedestals (5a) and (5b) ( 33), the shaft portion (51) of the drill blade (50) is placed on the support surface (12) of the guide ruler (4), and the edge portion of one of the cutting blades (55b) of the drill blade (50) (58) is supported, and the other cutting edge (55a) and the subsequent flank (56a) are positioned slightly separated from the polishing surface of the grindstone (3).
At this time, in this embodiment, the depth of the valley (33) can be adjusted by a simple dial (26) operation. That is, when the dial (26) is rotated counterclockwise, the intervention plate (7) is moved forward by the action of the gear (27) and the tooth portion (30), and the engagement grooves (31a) (31b) The drill blade cradle (5a) (5b) is moved away from each other by the action of the engaging projections (35a) (35b), thereby gradually forming a deep valley (33) (FIG. 7 (a)). (See (b)). Conversely, when the dial (26) is rotated to the right, the intervention plate (7) is moved rearward by the action of the gear (27) and the tooth portion (30), and the engagement grooves (31a) (31b) are moved. And the engagement protrusions (35a) and (35b) move the drill blade bases (5a) and (5b) toward each other, thereby gradually forming a shallow trough (33) (FIG. 8 (a)). ) (B)). In this way, in the present embodiment, it is possible to cope with a drill blade (50) having a shaft diameter of about 2 mm to 14 mm. As shown in FIG. 2, a scale (26a) is provided around the dial (26) to facilitate adjustment.

Next, the shaft portion (51) of the drill blade (50) is pressed from above with a hand or the like and fixed to the drill blade cradle (5a) (5b), and as the grindstone (3) rotates, the drill blade (50) Then, the drill blade cradle (5a) (5b) is slid forward together with the slide body (6), and the cutting blade (55a) and the subsequent flank (56a) are brought into contact with the polishing surface of the grindstone (3). To polish. At this time, the cutting edge (55a) to be polished and the grinding surface of the grindstone (3) are made substantially parallel.
In this embodiment, as shown in FIGS. 6, 7 (a), and 8 (a), a pushing portion (37) is recessed in the front portion of the lower surface of the slide body (6), and FIGS. As shown in FIG. 6, the leaf spring (39) accommodated in the front portion of the slide body (6) is formed on the bottom plate (2) by elastically contacting the pushing portion (37) to form a substantially V shape in plan view. Both ends are hooked and disposed on the projecting piece (39a). Then, against the elastic force of the leaf spring (39), the slide body (6) is slid in the forward direction, that is, in the axial direction X of the drill blade (50) and in the direction close to the grindstone (3). Polishing can be performed by bringing (50) into contact with the grindstone (3).

The same polishing process as described above is also performed on the other cutting edge (55b) and the subsequent flank (56b). If necessary, the above may be repeated several times for polishing.

According to the drill grinder (1) according to the present embodiment, the depth of the valley portion (33) formed in the drill blade pedestals (5a) (5b) can be freely adjusted by a simple dial (26) operation. Since it can be adjusted, it is possible to cope with various types of shaft diameters of the drill blade (50) with one instrument.
Further, if the external force that slides the slide body (6) forward is loosened, a pressing force is applied to return the slide body (6) to its original position according to the urging force of the leaf spring (39). It is easy to finely adjust the force when the blade (50) is brought into contact with the grindstone (3), and there is no possibility of excessive pressing. Therefore, polishing work with an appropriate force can be easily performed.
Moreover, since the tip of the drill blade (50) is appropriately guided by the support surface (12) of the guide ruler (4), the movement in the front-rear direction can be performed stably and smoothly.

Another embodiment of the present invention will be described with reference to FIGS. 9 is a plan view of the drill blade grinder, FIG. 10 is a side view of the drill blade grinder, FIG. 11 is a plan cutaway view along the first rotation axis of the grindstone portion, and FIG. 12 is the first rotation shaft and the second rotation. It is a disassembled perspective view which shows a connection mechanism with an axis | shaft.

The drill grinder (1 ') according to this embodiment uses a grindstone (3') having a disk shape. About the structure which is common in Example 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

The drill grinder (1 ′) according to the present embodiment is configured by fixing a cover body (11 ′) as shown in FIGS. 9 to 10 on the bottom plate (2). The grindstone (3 ′) has a disk shape, and the first rotation shaft (40) is inserted through the center of the grindstone (3 ′). As shown in FIG. 11, the bolts (41), (41b) and the nut (41a) are interposed. And screwed to the rotating shaft (40).
As shown in FIG. 9, the grindstone (3 ′) has a predetermined angle β (generally 60 degrees) with respect to the axial direction X of the drill blade, and the horizontal surface as shown in FIG. On the other hand, it is arranged so as to form a predetermined angle γ (approximately 60 degrees). As a result, the cutting blade of the drill blade to be polished and the flank face that follows can be brought into surface contact with the polishing surface of the grindstone (3 ′) without any gap.

  The first rotating shaft (40) is rotationally driven by a driving means (not shown). However, for example, when an electric drill body is used as the driving means, it is preferable that the electric drill body can be installed horizontally. For this purpose, this embodiment employs a mechanism as shown in FIG. That is, a gripping member (42) having a U-shaped cross section is fixed to the protruding end of the first rotating shaft (40), and the dice-shaped rotating member (44) is attached to its side surfaces (44a) (44b). A gripping part having a U-shape in a sectional view is also formed at the end of the second rotating shaft (45) connected to the electric drill body while being rotatably gripped through a shaft screw (not shown) passing through the shaft. 46) is fixed, and the rotary member (44) is rotatably held via a shaft screw (not shown) that passes through the upper and lower surfaces (44c) and (44d). Thereby, the rotation driving force of the second rotating shaft (45) by the electric drill body can be set to the first rotation while the angle formed by the first rotating shaft (40) and the second rotating shaft (45) can be freely set. Transmission to the shaft (40) can be ensured.

Even if it is the structure of such a drill grinder (1 '), a person with no experience and skill can grind a drill blade easily, but especially a disk-shaped grindstone (3') The cost can be reduced because of using.
In addition, the first rotating shaft (40) protrudes obliquely downward, but the second rotating shaft (45) and the driving means can be kept horizontal by the connecting mechanism as shown in FIG. .

  A third embodiment of the present invention will be described based on FIGS. 13 to 16 (a) and 16 (b). 13 is a plan view of the drill blade grinder, FIG. 14 is a side cutaway view of the drill blade grinder, FIG. 15A is a bottom cutaway view of the drill blade grinder, and FIG. Fig. 16 (a) is a bottom cutaway view of the drill blade grinder, and Fig. 16 (b) is a cross-sectional view taken along line D-D '.

In this embodiment, the drill blade grinder (1 ') according to the second embodiment is modified. Constituent elements common to those in the previous embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 13 to 16 (a) and 16 (b), the drill blade grinder (1 ″) according to this embodiment includes a bottom plate (2 ″), a grindstone (3 ′), a guide ruler ( 4 ′), a drill blade pedestal (5′a) (5′b), a slide body (6 ′), and an interposed body (7′a) (7′b). A drive motor (47) is used as the drive means.

In this embodiment, the drill blade pedestals (5′a) and (5′b) are configured to have a short overall length as shown in FIGS. The drill blade pedestal (5′a) (5′b) can be placed on a portion (see FIG. 17) provided with a spiral groove (52) in the shaft portion (51) of the drill blade (50). To do.
As shown in FIGS. 15 (b) and 16 (b), the drill blade pedestal (5′a) (5′b) is placed on the placement surface (16 ′) on the placement plate (15 ′). The presser portions (48) that face each other have a continuous shape. Then, in conjunction with the operation of the handle (49), which will be described later, the drill blade pedestal (5′a) (5′b) is guided by the locking piece (21 ′) while the front and rear ends thereof, while the slide body (6 ') Slides left and right (symmetrically with respect to the axial line X), and the shaft portion of the drill blade placed on the placement surface (16') is moved from the diagonally upward direction by the presser portion (48). It is designed to hold down and fasten. The upper plate that connects the upper ends of the presser portions (48) is formed with indentations on the inside so that the mounting plate (15 ') and the presser portion (48) can be engaged with each other ( (Refer FIG. 13, FIG.15 (b) and FIG.16 (b)).

  Cutout holes (23'a) (23'b) as shown in FIGS. 15 (a) and 16 (a) are provided at predetermined positions of the slide body (6 ′). As shown in FIG. 15 (b) and FIG. 16 (b), 'a) (23'b) includes drill blade bases (5'a) and (5'b) and an interposer (7'a ) And (7′b) are respectively connected through the connecting projections (35′a) and (35′b).

As shown in FIGS. 15 (a) and 16 (a), the interposers (7′a) and (7′b) have a substantially L-shaped flat plate shape in plan view, and have tooth portions (30 'a) (30'b) is provided. On the other hand, a disc-shaped gear (27 ′) is pivotally mounted at a substantially central position on the back surface of the slide body (6 ′) so as to mesh with the tooth portions (30′a) (30′b). Has been made.
As shown in FIGS. 13 to 14, a handle (49) is connected to the gear (27 ′), and the gear (27 ′) is rotated by the operation of the handle (49). (7′a) and (7′b) are configured to be horizontally movable to the left and right.

When using the drill blade grinder (1 ″) according to the present embodiment, the drill blade base (5′a) (5′b) is opened to the left and right and the drill blade is mounted on the mounting surface (16 ′). Put. Then, by rotating the handle (49), the drill blade pedestals (5′a) and (5′b) are closed, and a clamping force from above is applied to the drill blade via the presser portion (48). Like that.
The rear end portion of the drill blade shaft portion protrudes behind the drill blade cradle (5′a) and (5′b). The polishing operation may be performed by gripping this portion by hand. . Also in this embodiment, as shown in FIG. 14, the drill blade cradle (5′a) (5′b) and the slide body (6 ′) are connected to the bottom plate (2 ′ through the leaf spring (39). ') It is set up on top.

With such a drill blade grinder (1 ″), the drill blade can be securely fastened to the drill blade cradle (5′a) (5′b), and the drill blade bounces up during polishing. It is possible to work safely.
In addition, by simply operating the handle (49), any shaft diameter of the drill blade can be immediately set to the optimum position. Moreover, it is not necessary to adjust to a fine scale, and it is possible to perform an accurate operation even when the shaft diameter of the drill blade is not known.
Furthermore, the overall length of the drill blade pedestal (5′a) (5′b) is configured to be short, so that the entire tool can be made compact even when the drive motor (47) is integrally mounted.

The interposers (7′a) and (7′b) may be elastically disposed using a coil spring or the like, and a stronger fastening force may be applied to the drill blade shaft portion.
Further, it is preferable that the drill blade pedestal (5′a) (5′b) is entirely covered with a cover member having an opening portion through which the drill blade can be inserted in the front-rear direction to improve the appearance. .

The present invention provides a drill blade grinder that can easily grind a drill blade even if it is not experienced and skilled, and has industrial applicability.

It is a disassembled perspective view of a drill blade grinder. It is a top view of a drill blade grinder. It is a side view of a drill blade grinder. It is a side view of a drill blade grinder. It is a bottom view of a drill blade grinder. It is a plane fracture view of a drill blade grinder. (A) Bottom view of drill blade grinder, (b) A-A 'line sectional view. (A) Bottom view of drill blade grinder, (b) B-B 'line sectional view. It is a top view of the drill blade grinder which concerns on other embodiment. It is a side view of the drill blade grinder which concerns on other embodiment. It is a plane fracture view along the 1st axis of rotation of a grindstone part. It is a disassembled perspective view which shows the connection mechanism of a 1st rotating shaft and a 2nd rotating shaft. 7 is a plan view of a drill blade grinder according to Embodiment 3. FIG. 6 is a side cutaway view of a drill blade grinder according to Example 3. FIG. (A) Bottom view of drill blade grinder, (b) C-C 'line sectional view. (A) Bottom view of drill blade grinder, (b) D-D 'line sectional view. (A) The side view which shows a drill blade, (b) It is a front view which shows a drill blade.

Explanation of symbols

1, 1 ′, 1 ″ drill grinder 2, 2 ′, 2 ″ bottom plate 3, 3 ′ grinding wheel 4, 4 ′ guide ruler 5a, 5b drill blade base 5′a, 5′b drill blade base 6 , 6 'Slide body 7, 7' Interposer 10 Rotating shaft 12 Support surface 15 Mounting plate 16 Mounting surface 23 Notch hole 23'a, 23'b Notch hole 31a, 31b Engaging groove 33 Valley 35a, 35b Engagement protrusion 35'a, 35'b Connecting protrusion
39 Leaf spring 40 First rotating shaft 45 Second rotating shaft 50 Drill blade 51 Shaft portion 54 Tip portion 55a, 55b Cutting blade 56a, 56b Flank X-axis direction

Claims (5)

A drill blade grinder for polishing a drill blade in which a pair of cutting blades and a flank following the pair of cutting blades are formed at the tip,
A grindstone that can be rotated by being inserted through a rotating shaft connected to the driving means, and that can be ground by abutting one of the cutting blades and the flank that follows,
A guide ruler that stably supports the other cutting edge from below;
Each of the mounting plates having a mounting surface that is inclined inward and has a mounting surface for forming a trough for mounting the shaft portion of the drill blade has a substantially comb shape in plan view, and the shaft of the drill blade. A pair of drill blade pedestals arranged so as to be engaged with each other so that the depth of the valley portion can be adjusted by moving in a direction perpendicular to the direction and away from each other
The drill blade pedestal is elastically provided via a spring, and the drill blade pedestal is slid in the axial direction of the drill blade and in the direction close to the grindstone against the elastic force of the spring. A drill blade polisher made to polish a drill blade. The grindstone has a cylindrical shape that passes through the rotation shaft at the axis position,
The drill blade grinder according to claim 1, wherein the rotation shaft is disposed at a predetermined angle (α) in a plan view with respect to the axial direction of the drill blade. The grindstone has a disk shape with a rotating shaft inserted in the center position,
The polishing surface of the grindstone is disposed at a predetermined angle (β) in a plan view with respect to the axial direction of the drill blade and at a predetermined angle (γ) with respect to a horizontal plane. Drill blade polishing machine. The drill blade grinder according to any one of claims 1 to 3, wherein a presser portion is connected to an upper portion of the mounting plate so that a fastening force is applied to the shaft portion of the drill blade obliquely from above. . The drill blade grinder according to any one of claims 1 to 4, wherein an electric drill main body on which a drill blade is mounted is used as the driving means.

Images