DD206954A1 - DISC FAILURE CUTTING CHISEL - Google Patents

Abstract

The invention relates to a scheibenfoermigenschull Abstechmeissel and can be used in the machining process turning for all cutting-off as well as piercing, primarily in the metalworking industry. The aim of the invention is the stabilization of the parting process with considerable increase in service life and material savings in burr-free workpieces. The essence of the invention consists in a novel cutting geometry and modified engagement of Abstechmeissels workpiece, with part of the circumference is used as a curved Spanflaeche and the chisel with a free cut as free space, the Abstechmeissel has no exaggeration and is centered with its cutting edge on the workpiece ,

Description

Discussion of the Invention Disc-shaped pestle

Field of application of the invention

The invention relates to a disc-shaped cutting tool with a new cutting geometry and can be used in the machining process turning for all cutting and piercing work. The Abstechmeißel is primarily used in the metalworking industry for parting off rotationally symmetrical workpieces and is particularly suitable for hollow sections, z. B. pipe material.

However, the Abstechmeißel can also for processing wood, plastic u. Ä. Materials are used.

Characteristic of the known technical solutions

Disc-shaped cutting-off tools are available in a large number of constructive solutions for optimizing the previous, fundamental

In addition, existing Sehneidengeometrien known with the aim of Improimg the production of the stand and vferkzeugwechselzeit, the cutting behavior and the regrinding, without that these solutions own Natshteile could be completely eliminated.

So disc-shaped Abstechmeißel have been proposed with different cutouts, in which the material thickness is tapered from the point of the circumference, where the cutting edge is located, conically towards the opposite point and / or decreases from the outer periphery to the receiving bore material thickness. Depending on the cutout, the circumference can be defined as a circular, spiral or helical line as well as concentrically as well as eccentrically to the receiving bore (DR? 68 001, 285 251, 304 704, 519 688).

In accordance with the conditions of use, such circumference as a curved free surface and the chisel cutout are generally used as a straight rake face in such cut-off tools with an elevation for generating a defined clearance angle.

Despite the advantage of easy ITachschleifens taking advantage of the approximately entire circumference such Abstechmeißel have significant disadvantages. So remains in addition to relatively high production costs and large operating effort in the application, the Spanfluß, even with additionally provided Spanleitstufe, inhibited by the described chisel detail and leads to chip accumulation.

Due to the elevation of the Abstechmeißels to achieve a defined clearance angle results in addition, while maintaining a positive rake angle, a small rope angle. This fact in turn leads to insufficient heat dissipation and insufficient support of the rake face, which has a negative effect on the service life, as well as the quality of the workpieces, as well as by fluttering and running of the Abstechmeißels.

- 3 object of the invention

The aim of the invention is the elimination of the mentioned disadvantages to stabilize the entire parting process, in order to achieve an increase in labor productivity and saving of base material.

Explanation of the essence of the invention

It is the object of the invention to provide a particularly narrow, disc-shaped cutting-off tool with a novel cutting geometry and a modified initial grip to the workpiece, eg, pipe material.

According to the invention, the object is achieved by an advantageously circular disk-shaped, narrow cutting-off tool with a concentric receiving bore and plane-parallel collar, the thickness of the cutting tool tapering conically on both sides from the outer circumference to 3 and being defined weaker than that of the federal government. The section of the Abstechmeißels has according to a feature of the invention, an open space, which is performed on the circumference of the main cutting edge on the vertical center line of the disc, undercut after one half of it and merges into an example. Falling cutout for workpiece half side. The main cutting edge is advantageously an oblique cut and variant associated with a chip breaker. Another feature of the invention is that the Abstechmeißel has no elevation and the main cutting edge is set to the center of the workpiece, resulting in a maximum wedge angle derived. Furthermore, the main cutting edge is designed as the highest body edge of the parting tool for the workpiece.

With the help of the novel cutting geometry and the position of the Abstechmeißels to the workpiece at maximum wedge angle, without elevation and use of a portion of the circumference as a curved rake surface results in good heat dissipation a free chip flow and good support of the main cutting edge, which in total to a significant increase in service life corresponding saving of material and working time during burr-free parting ·

embodiment

The invention will be explained in more detail below on an exemplary embodiment for parting off pipe material. The accompanying drawing shows:

Figure 1 - a side view of the disc-shaped Abstechmeißels with workpiece

Figure 2 - a side view of the disc-shaped Abstechmeißels with chip breaker

FIG. 3 shows a plan view of the disc-shaped cutting-off tool according to FIG. 2

FIG. 4 is a sectional view of the disk-shaped parting tool according to the section line of FIG. 2

Tray Figure 1 13t the disc-shaped Abstechmeißel 1 with a circular circumference 2, receiving bore 4 with plane-parallel collar 4, undercut open space 6 and, for example, inclined free cut 7 shown. FIG. 3 shows the main cutting edge 8 with bevelled edge 9 and cutting corners 10, 11, wherein the cutting corners 10, 11 act on the workpiece 12 in succession by the beveled grinding 9.

The cutting geometry of the advantageously beveled main cutting edge 8 with its cutting corners 10, is determined by an existing on the circumference 2 rake angle ^ * and existing on the free surface 6 clearance angle * £> (Figure 1) and the Heigungswinke1 Я of the bevel cut of the main cutting edge 2 Figure 3 »together with, from the conical taper of the material thickness of the Abstechmeißels 1 to the collar 5 out, not graphically illustrated two clearance angle.

As a result, a burr-free parting off of the tube material without jamming the Abstechmeißels 1 is realized with good heat dissipation. By means of the chip breaker 3> material-dependent attached to the circumference 2 behind the main cutting edge 8, the Spanfluß for complicated Abstechvorgänge can be improved.

Claims (3)

invention claim · Disc-shaped cutting tool for parting and piercing, especially for hollow sections, eg. B. pipe material, for example, designed as a circular, narrow Abstechmeißel with cutout, concentric receiving bore and plane parallel collar, the material thickness of the Abstechmeißels tapered conically from the outer periphery to the collar on both sides and is held weaker than that of the Federal, characterized in that Section of the Abstechmeißels (1) has an open surface (6), which at the periphery (2) of the known with bevel (9) and Spanleitstufe (3) provided major cutting edge (8) from above the vertical center line of the Abstechmeißels (1) starting after one half of which is executed undercut and in one, the cut completes, for example. Falling Preischnitt (7), goes to the workpiece half side. 2. claim according to item 1, characterized in that the Abstechmeißel (1) without elevation and the main cutting edge (8) is set to the workpiece center · 3 · claim according to item 1 and 2, characterized in that the main cutting edge (8) represents the highest body edge of the cutting tool (1) to the workpiece (12). For this 1 sheet drawing