JP2565802B2 - Method for forming tip blade of boring cone for woodworking - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a tip edge of a boring cone used for drilling wood-based or resin-based materials and composite materials similar thereto.

[0002]

2. Description of the Related Art A boring cone for woodwork generally used in the past has an acute angle in order to improve the processing quality near the hole entrance.
~ It has a pointed hair cutting blade 11 formed as shown in Fig. 17 and has a guide cone 12 projecting higher than the hair cutting blade 11 at the center of rotation in order to suppress the deflection of the cone. A two-blade type in which a bottom blade 13 was formed between the guide cone and the guide cone was generally used.

[0003]

In this case, the A dimension inevitably changes when the blade diameter of the cone is changed. The shape of the bristling blade 11 is also complicated as shown in FIGS. 16 and 17, and since the central cone 12 exists separately from the bottom blade 13, multiple steps are required to obtain a predetermined shape. Since there is no polishing machine that performs simple operation, it is processed by hand depending on the feeling of a skilled worker. In addition, this work was not impossible for skilled workers to process with one grindstone even if the blade diameter of the cone was different, but advanced technology is required, and as another method, prepare multiple grindstones that match the blade diameter. It was then replaced and processed.

The present invention has been made in view of the above problems of the prior art. The object of the present invention is not to use a special tool grinder but to use a general universal tool grinder with a simple and minimum size. An object of the present invention is to provide a method for forming an accurate tip blade without requiring skill in operation.

[0005]

Means for Solving the Problems The present invention to achieve the above object, the two blade as many chip discharge grooves in cyclotomic position of the cylindrical body is formed, the blade How to rotate your body
In the boring cone for woodworking, where the tip of the side surface of the chip discharge groove facing toward is the rake face of the bottom blade, the thickness is
The outer peripheral shape of the cross section including the axis at a radius or more is substantially V-shaped convex
The outer circumference of the V-shaped grindstone is the V-shaped top surface, and
The blade should be in the direction of rotation backward from the rake face side.
Align the tip of the body with the V-shaped apex
Position away from each other and press the outer surface of the grindstone against the blade.
When the cutting operation is performed, the blade body is scooped to the tip of the blade body on the outer peripheral surface of the grindstone.
Grinding V-shaped groove in the direction of rotation backward from the face side
After forming one of these V-shaped grooves, drill a boring cone.
Rotate 180 ° around the axis to index V to other blades as well.
Grinding the V-shaped groove to make each blade point symmetrical with respect to the conical axis
A round bristle pulling blade in which the line of intersection between the one surface of the V-shaped groove and the outer peripheral surface of the blade is a substantially arc curve by grinding and forming once or several times, the surface of the V-shaped groove and the rake. intersection line end cutting edge reaching the vicinity of the center than the outer peripheral by the face, 3 the center cone became end cutting edge and integrally form form the peaks through the center
The point is created at the same time for each blade . Then, the V-shaped top surface of the grindstone is formed from the created ridge from the thickness direction.
The central cone is formed at the apex by grinding on the inclined surface . Alternatively, it is desirable to form the central cone at the tip by thinning the created peak from the thickness direction at the V-shaped top surface of the grindstone .

[0006]

First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. The boring cone forming the tip blade has a chip discharge groove 1 having an arc-shaped cross section at two points symmetrical with respect to the center of a cylindrical body, and is formed twisted or straight to be long in the axial direction, and the remainder is connected at the center. The tip blade is created by grinding from the material forming the blade body 2.

An ordinary universal tool grinder is provided with a grindstone 3 having a substantially V-shaped cross-section with a double-sided angle, although the outer peripheral edge does not necessarily have to be an accurate V-shape. As the grindstone 3, a diamond grindstone, a borazon grindstone, or the like is also used depending on the material of the cutting edge portion of the cone. The shank portion of the body of the boring cone is inserted and fixed in a jig having an indexing angle, which has an indexing mechanism capable of dividing the circumference into at least two parts on the table.

Then, one of the two V-shaped grooves at the tips of the blades 2 and 2 is to be formed with respect to the central axis of the boring cone.
The table is positioned so that the V-shaped apex of the grindstone is located at a predetermined position away from the center of the conical axis, and the direction of the V-shaped top surface of the grindstone is γ degrees with respect to the line connecting the blade edges of the blade bodies 2 and 2. The angle of the jig as follows. Further, a position where the axis of the grindstone is deviated to the back side of the rake face of the blade so that the inclination angle formed by a line perpendicular to the line connecting the grinding wheel center and the grinding point, that is, the tangent line and the line perpendicular to the cone axis is β degrees Adjust to. That is, outside the V-shaped grindstone
Circumferential V-shaped top surface rotates in the circumferential direction from the rake face side of the blade
Align the blades so that the direction is backward. When this preparation is completed, the grindstone 3 is cut to a predetermined depth, and the grindstone 3 is retracted. Next, the jig is rotated by 180 °, and the grindstone 3 is similarly cut and ground to a predetermined depth and retracted. This process may be repeated several times if necessary.

By this cutting grinding, the V-shaped ground surface of the grindstone 3 forms V-shaped grooves on the two blade bodies 2, 2 at positions symmetrical with respect to the center of the body tip. The V-shaped one sloped surface 3a of the grindstone 3 forms a ridgeline of a substantially arc-shaped intersection line with the outer peripheral surface of the blade body 2 to create a round bristle blade 4a1.
The end cutting edge and integrally formed simultaneously peaks through the Rutotomoni center end cutting edge 4b1 by ridges made by the line of intersection is created until near the center than the outer periphery of the rake face 1 by the other inclined surface 3b at the same time
The central pyramid that became is also created .

The cones are inverted by 180 °, and the round bristle pulling blades 4a2 and the bottom blades 4b2 having substantially circular arc curves are similarly created at the same time.
Then, the bottom blades 4b1 and 4b2 cause the peak to pass through the center.
The central cone consisting of is inevitably created. If the center of the jig with the boring cone attached can be inclined by β degrees, move the table with respect to the grindstone 3 so that it passes under the grindstone 3.
Similarly, the V-shaped groove at the tip can be ground by the cutting operation . In the first embodiment, one end of the bottom of the V-shaped groove is provided so as to open on the line of intersection between the rake face and the outer peripheral surface, but it is not necessary to be at this position.

[0011]

Second Embodiment A second embodiment will be described with reference to FIGS. Tip bottom blades 4b1 and 4b2 created in Example 1
In order to make the peak to be created a central pyramid with a sharp tip, the grindstone 3 is once retracted with the round hair cutting blade and the bottom blade created, and the jig is swung approximately 90 ° and the grindstone 3 is cut by a predetermined amount. , The slope 3a is used to grind the peak diagonally from the core thickness direction,
Is moved backward and the jig is turned by 180 °, the same amount of the grindstone 3 is again cut, and the opposite side of the ridge is ground obliquely to create a central cone 5 having a point.

[0012]

Third Embodiment A third embodiment will be described with reference to FIGS. In order to thin the created ridge to form a central cone having a pointed end, the boring cone in which the cutting edge was created in Example 1 is directly attached to the jig, and the grindstone 3 is retracted to have an inclination angle β of about 70 °. The position of the apex of the V-shaped crest of the grindstone 3 is adjusted to the center position of the boring cone while being moved so as to become larger. Then, the table is moved toward the grindstone 3 so that a V-shaped groove is formed at the center of the central cone 5, and thinning is performed from the core thickness direction of the peak. The table is once retracted, the jig is turned 180 °, and similarly thinning is performed from the opposite side of the ridge to form the thinning surface 6.

[0013]

Fourth Embodiment A fourth embodiment will be described with reference to FIGS.
The grindstone 3 has asymmetric V-shaped ridges, but grinding is performed in the first embodiment.
The same is done as. In general, the side having a large slope angle is the round bristle blade forming side and the side having a small slope angle is the bottom blade forming side, so that the bottom blade 4b1, 4b1,
The height of 4b2 becomes low. Therefore, the effect of the guide cone of the central cone 5 becomes small. If necessary, the central cone is thinned as in the third embodiment.

Further, even if a conventional rectangular cemented carbide tip is embedded and brazed in the central axis direction of the body tip, the first embodiment of the present invention will be described.
The tip blade forming methods of 2 and 3 can be carried out as shown in FIGS. 10, 11 and 12 .

[0015]

Since the forming method is as described above, the present invention has the following effects. In the method of claim 1, the outer circumference is substantially V-shaped
Hair引刃, the end cutting edge is created inevitably centered cone is created at the same time simply by transferring the shape of <br/> abrasive stones in one direction simply cut operation of the single abrasive stones have the form top so, it is possible to creating an easily short time even in the work who is not a skilled person in a stable blade shape it is possible to Ken KezuKa Engineering in the usual universal tool grinder not the one special.

[0016] and Yamagata of the abrasive stone can be freely used without being limited to a symmetric-asymmetric. Preferably those located at the top abrasive stone thickness Mino center of V-shaped in the symmetrical chevron is possible similarly Ken KezuKa <br/> Engineering against boring cone of any lateral direction of rotation . It can save money and can further support to the abrasive stone one Tsude less cone diameter of all double-sided angle to match the cone diameter of the large diameter. Furthermore, the amount of protrusion of the central cone from the bristle blade and the size of the bristle blade are more centered than those of the round bristle blade by changing the angle of the V-shaped groove, the position from the center of the cone, and the inclination angle β and the intersection angle γ. even higher cone projection amount Ru der it can be easily adjusted lower. In the methods of claims 2 and 3 , the cutting resistance is reduced by improving the sharpness of the central cone.

[Brief description of drawings]

FIG. 1 is a front view of a ground state according to a first embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a cone end view after grinding.

FIG. 4 is a side view of a ground state according to a second embodiment.

FIG. 5 is a front view of the same.

FIG. 6 is a front view of a ground state according to a third embodiment.

FIG. 7 is a rear view of the same.

FIG. 8 is a front view of a ground state according to a fourth embodiment.

[9] Ru same side view der.

FIG. 10 is a front view of a conventional drilling cone that has been ground in Example 3;

FIG. 11 is an end view of the same.

FIG. 12 is a side view of the same.

FIG. 13 is a front view of a conventional tufting blade and a boring cone having a central cone.

FIG. 14 is an end view of the same.

FIG. 15 is a side view of the tip portion.

FIG. 16 is an enlarged view of the hair pulling blade.

FIG. 17 is a view taken along the line EE of FIG.

[Explanation of symbols]

 1 Chip Discharge Groove 2 Blade 3 Grindstone 3a, 3b Grinding Surface 4a1, 4a2 Round Hair Pulling Blade 4b1, 4b2 Bottom Blade 5 Center Pyramid 6 Thinning Surface

Claims (3)

(57) [Claims] 1. A method of rotating the blade body, wherein the same number of chips discharge grooves as the two blade bodies are formed at the circumferentially equidistant positions of a cylindrical body.
In the boring cone for woodworking, where the tip of the side surface of the chip discharge groove facing toward is the rake face of the bottom blade, the thickness is
The outer peripheral shape of the cross section including the axis at a radius or more is substantially V-shaped convex
Outer circumference of V-shaped grindstone The V-shaped top surface is scooped by the blade in the circumferential direction.
The blade body should be in the direction of rotation backward from the face side.
While aligning with the tip side, separate the V-shaped vertex from the center of the cone.
Cutting movement to position and position the outer surface of the grindstone against the blade
Depending on the work, the rake face of the blade is attached to the tip of the blade on the outer peripheral surface of the grindstone.
Grinding V-shaped groove in the direction from the side to the rear in the direction of rotation
Then, after forming the V-shaped groove on one side, set the boring cone to the conical axis.
180 ° rotation index to the center and V-shape for other blades as well
Grooves are formed by grinding and each blade is made point-symmetrical once with respect to the cone axis.
Or, by repeatedly performing grinding and forming several times, a round bristle pulling blade in which the line of intersection of one side of the V-shaped groove and the outer peripheral surface of the blade body is a substantially arc curve, the surface of the V-shaped groove and the rake face. 3 the point where the central cone became end cutting edge and integrally forms the shape of the end cutting edge reaching the vicinity of the center than the outer peripheral by intersecting lines, the peaks through the center
A method for forming the tip blade of a boring cone for woodworking, characterized in that the blades are simultaneously created for each blade. 2. The peak created in claim 1 is arranged in the thickness direction.
Center by grinding on the slope that forms the V-shaped top surface of the grinding wheel
A method for forming a tip edge of a boring cone for woodwork, characterized by forming a cone at the tip. 3. The peak created in claim 1 is arranged in the thickness direction.
Tip blade forming method of the woodworking boring cone and forming a central cone and shea N'ningu with V-shaped top surface of the grinding wheel to tip Ri.