Engraving cutter

IPC classes for russian patent Engraving cutter (RU 2399463):

B44B3 - Artists' machines or apparatus equipped with tools or work holders moving or able to be controlled substantially two-dimensionally for carving, engraving, or guilloching shallow ornamenting or markings (marking or engraving metal by the action of a high concentration of electric current B23H0009060000; forme engraving B41C, B41D; engraving by photomechanical reproduction G03F)

B23D13 - Tools or tool holders specially designed for planing or slotting machines (features applicable also to turning-machines B23B0027000000, B23B0029000000; for cutting gear teeth B23F0021040000)

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Cutter to number program controlled machine / 2262420

FIELD: technological processes.

SUBSTANCE: invention relates to the field of machine-tool construction. Engraving cutter comprises cylindrical tail and working cutting part with front and main back planes, blunting surface with end cutting edge and auxiliary back conical surface with straight generatrix line. Generatrix line of auxiliary back conical surface is arranged in the form of circumference part. Blunting surface, front and main back surfaces are arranged in the form of part of cylinder surfaces, at the same time axes of symmetry in front and main back surfaces are perpendicular to axis of tail symmetry, and axis of blunting surface symmetry is parallel to end cutting edge.

EFFECT: invention makes it possible to reduce volume of polished material, to increase durability, to eliminate necessity of periodical straightening of abrasive tool.

2 cl, 5 dwg

The invention relates to a machine-tool industries, namely the types and forms of manufacturing cutting tools milling machines, and is intended for engraving grooves and drilling tapered holes, for example, for milling and drilling foiled and non-foiled material of printed circuit boards, as well as for engraving inscriptions on products from metals and dielectrics.

Famous engraving cutter containing a cylindrical shank and a working cutting edge with the front and rear main surfaces, the surface of the blunting with end cutting edge and the auxiliary rear conical surface with a straight generatrix line (prototype).

The disadvantages of the prototype are low strength and rigidity of the cutter, low maintainability, performance, production and a small amount of re.

1. So, if forming a rear conical surface of the cutter straight line, for small cone angles, the length of the side cutting edge is so large that cut the portion of the cylindrical shank, which is designed for mounting the cutter in the collet of the machine spindle. The standard length of the engraving cutter with a diameter of 3 mm (3.175 mm) 36 mm length of the cylindrical part of the tool, designed for mounting in Tsang, 22.5 mm conical part of the remains of 13.5 mm The minimum angle of the cone with the diameter at the end of 0.2-0.4 mm is 11-12°. Therefore, engraving cutters of this design are available with a minimum angle of 15 degrees.

2. When grinding engraving cutter with small-angle sharpening removes more than half of the mass of the workpiece, which increases the processing time and the wear of the abrasive tool.

3. When the length of the generatrix of the cone decreases resource when re-grinding of the cutter.

4. At small angles of the cone cutter reduces the stiffness and strength of the tool.

To avoid these disadvantages engraving cutter differs in that the forming line auxiliary rear conical surface in the form of part of a circle, the surface dulling, front and rear main surfaces are made as part of surfaces of the cylinder, with the axis of symmetry of the front and rear main surfaces perpendicular to the symmetry axis of the shank and the axis of symmetry of the surface blunting parallel end cutting edge, you may perform auxiliary rear surface of the multi-faceted approximating a conical surface.

The essence of the proposal is illustrated by drawings.

Figure 1 shows the engraving cutter of known construction (prototype). He has a front edge and a rear main surface is flat. Auxiliary rear stand is rnost - conical. The surface of the blunting also flat (not shown).

Figure 2 shows the claimed design engraving cutter marked surfaces. Unlike the prototype, all of the shaping surface is cylindrical. The advantages of this form of design, technological and operational - as outlined in the application.

Figure 3 shows the claimed cutter, oriented so that the axis of symmetry of the front cylindrical cutting surface is perpendicular to the plane of the drawing and therefore perpendicular to the axis of the shank, which is in the plane of the drawing.

4 shows the cutter in position when the axis of symmetry of the main rear cylindrical surface is held perpendicular to the plane of the drawing, which is also perpendicular to the axis of the shank. The symmetry axis of the auxiliary rear cylindrical surfaces, as the main back surface perpendicular to the axis of the shank.

Figure 5 shows the cutter from the front cutting surface. In the drawing it is seen that the end cutting edge beveled, i.e. not perpendicular to the axis of the shank.

Engraving cutter has a smooth cylindrical shank 1, a cylindrical front surface 2, the main rear auxiliary cylindrical surface 3, a back supporting surface is 4 th in the form of a radial smooth conical surface and a cylindrical plane blunting 5.

At the intersection of the front surface of the main back surface is formed of the side cutting edge 6, and with the plane of the blunting - end cutting edge 7.

The angle between the planes forming cutting edges, is selected depending on the material of the cutter, the cutting conditions and workpiece material. This information is contained in the recommendations of the producers of tools and production directories.

To improve the technological process of manufacturing engraving cutter, conical surface is in the shape approximated by a polyhedral surface 8. The number of faces is selected such that the approximated multi-faceted surface is a little different from the taper. For example, for a cutter with a diameter of the tail portion of 3 mm is sufficient 12-18 sides (360°).

The advantage of the multi-faceted forms of the auxiliary rear surface is that when grinding each face an abrasive works "out," and so it wears evenly, automatically retaining its cylindrical shape. Thanks to this circle does not need periodic revision during the entire period of operation up to full wear and tear.

To increase the stability of the cutter it is made mostly of fine-grained hard metal, such as brand VK-OHMS. As abrasive and is the instrument used disks with working part of diamond.

Inventive step is confirmed by the fact that (according to claims) front and rear main surface, and the surface dulling, is cylindrical, with a radius of curvature equal to the radius of abrasives (abrasive wheels)carrying out the sharpening of the cutter and the axis of symmetry of the cylindrical front and rear main surfaces perpendicular to the axis of the shank, the axis of symmetry of the surface of the blunting parallel end cutting edge, and forming the auxiliary line of the rear conical surface has the form of a segment of a circle, the radius of which is equal to the radius of the abrasive tool, the positive technical effect consists in the following:

- reduces the amount of material so removed;

- increases resilience (share) of the abrasive tool;

- eliminates the need for periodic dressing of the abrasive tool;

- reduced the length of the working portion of the cutter and, consequently, increases the number of potential re;

- increases the rigidity of the cutter and resistance to chipping in the cutting process.

Sources of information

1. Engraving cutter type HGS-3. Catalogue "Equipment by ROLAND". 1991, p.1 (Internet: www.Roland.ru)/prototip/.

1. Engraving cutter containing a cylindrical shank and a working resumeobject with front and rear main surfaces, the surface of the blunting with end cutting edge and the auxiliary rear conical surface with a straight generatrix line, wherein forming the auxiliary line of the rear conical surface in the form of part of a circle, the surface dulling, front and rear main surfaces are made as part of surfaces of the cylinder, with the axis of symmetry of the front and rear main surfaces perpendicular to the symmetry axis of the shank and the axis of symmetry of the surface blunting parallel end cutting edge.

2. Engraving cutter according to claim 1, characterized in that the auxiliary rear surface is made of multi-faceted, approximating a conical surface.