Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1980-04-04
1982-06-01
Whitehead, Harold D.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51225, B24B 1900
Patent
active
043321097
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an apparatus for grinding the cutting edge flank having special figure of a newly developed end mill, which was developed by this inventor.
BACKGROUND ART
First, the essential point of this newly developed end mill A will be described. Referring to FIGS. 1 to 3 inclusive, an end mill body 10 is comprised of a shank 11 and a spherical point 12, where a tip 20 is fixed. The tip forms substantially rectangular plate, a substantially lengthwise long rectangle with inclination rake angle E in front view (FIG. 1), and a substantially lengthwise long rectangle in bottom view (FIG. 2). And the tip 20 forms a curve composed of a circular arc with radius Q at center P and a straight line, in a left side view (in FIG. 1) as shown in FIG. 3. The positional relation of the tip 20 and the body point 12 in bottom view, will be as follows. A first long side face 21 is located on the radius of the end mill, a corner 26 is located on near the end mill center O, and a first short side face 23 is positioned on ahead side from the first long side face 21 in a direction of rotation S of the end mill. A second long side face 22 forms a rake face, a second short side face 24 forms a flank of the tip side, and a point curve surface 25 forms a flank of the tip nose. Moreover, the second long side face 22 and the cutting edge formed on the nose of the first short side face 23 are connected by a smooth curve to form the nose cutting edge 27, and a boundary line between the second long side face 22 and the second short side face 24 connected to the cutting edge 27 forms a side cutting edge 28. Namely, the nose cutting edge 27 are shown as a smooth curve or a smooth combined line of a curve and a straight line or a broken line which is convex in the bottom view in ahead side in the direction of rotation of the end mill against the straight line L connecting the beginning of the cutting edge at end mill center and the end of the cutting edge at the outer periphery of the end mill. Consequently, a three dimensional cutting is achieved at the point cutting edge 27, and the cutting force acting on the tip decreases greatly, and the cutter endures satisfactorily a high speed heavy cutting. In case of small end mill, the prescribed cutting edge is directly formed in a round rod of cemented carbide, not formed in a tip.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a grinding apparatus for grinding the point flank of such difficult curved surface as above easily and accurately by an unskilled hand.
These objects are to be achieved by the present invention as below.
A grinding apparatus for a flank of an end mill point comprising:
a grinding part having a grinding wheel;
a model guide having a guide face flush with the grinding face of the grinding wheel and arranged to locate under the grinding face of the grinding wheel;
a cutter support fixing the stickey cutter horizontally in a support shell;
a model support wherein the model is inserted in a cylindrical arm hanging from the support shell of the cutter support is substantially the same height as the model guide, and the axial line of the model is located to be pararell with the axial line of the cutter, and, the model contacts with the model guide when the cutter contacts with the grinding face of the grinding wheel;
a shift part for shifting the cutter support and the model support together toward the grinding wheel;
and the model is of a cylindrical body having a spherical point which has the same outer periphery surface as rotary contour outline of the cutter grinded in the required condition, and on the outer periphery surface of the model a groove is provided so that there is formed a model line corresponding to the required cutting edge of the cutter;
the cutter pre-grinded to have the same surface of revolution as the model is supported in the cutter support for obtaining the required clearance angle;
the model is supported in the model support in the same positional relation as the cutter;
the cutte
REFERENCES:
patent: 2470021 (1949-05-01), D'Avaucourt
patent: 2538532 (1951-01-01), Oliver
patent: 2552645 (1951-05-01), Oliver
patent: 3568369 (1971-03-01), Marshall
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