DE473998C - Method of making files - Google Patents

Description

In the previous working methods, the cutting teeth of files are through a File chisels or a profiled milling cutter generated. It's hard to hit one to obtain appropriate shape of the cutting tooth, while large when milling Tool costs arise.

According to the present invention, the cutting teeth of the files are pulled by pulling produced by means of a die on a drawbench. The material can be in the form of rods, Tubes or sheet metal bent into tubes can be used. The cutting teeth can Any shape and size possible with regard to the face angle, cutting angle and pitch.

Flat files as well as round and half-round files can be produced. In the case of round and half-round files, the Werkao piece must still be subjected to a rotation about the longitudinal axis so that the cutting teeth are inclined to the longitudinal axis. It is advisable to twist the file while it is glowing.
The invention is illustrated in the drawing in some exemplary embodiments.

Fig. Ι shows a flat bar together with a die in section.

Fig. 2 is the view of the die along with the cross section of the flat bar.

Fig. 3 is a view of the flat bar. Fig. 4 shows the pulling of a round rod on average.

Fig. 5 shows a view of the die and the cross section of the round bar.

Fig. 6 shows the round bar in view. In

Fig. 7 shows a pipe with a die and mandrel in section.

Figure 8 is a view of the die and mandrel and a cross section of the tube.

Fig. 9 shows the drawn tube partially in longitudinal section.

Fig. Ro is a view of a pipe after it has been twisted.

Fig. 11 is the development of the pipe. - 4-5

Fig. 12 shows the development of the twisted pipe.

The way it works is as follows:

A flat bar α is drawn through a die b (Fig. 1 and 2). The profiled rod α obtained in this way is cut according to the dotted line (Fig. 3).

The round rod c is pulled through a die d (Fig. 4 and 5) and thus receives cutting teeth which are parallel to the longitudinal axis. In order for these cutting teeth to have the oblique position necessary for a round file, the round rod c is wound around its longitudinal axis in the glowing state. A pipe can be treated in the same way, so that in this way two semicircular files can be obtained from a pipe by cutting in the longitudinal direction.

Flat files can also be produced by pulling a tube e through a die f and a mandrel g (Figs. 7, 8

and 9). After drawing, the pipe is cut lengthways and made into a plate bent up (Fig. 11 and 12) and then the Cut the width of the files accordingly, as indicated in dashed lines. Even this tube can be rotated around its axis in the heated state to oblique To get cutting teeth.

Instead of the tube, a sheet metal can be used, which is bent together to form a tube has been.

Claims (4)

Patent claims: 1. Process for the production of files, characterized in that the cutting teeth are produced by drawing by means of a die. 2. A method for producing files according to claim 1, characterized in that that a steel rod drawn through a flat die cuts into individual file workpieces transversely to the direction of drawing will. 3. A method for producing files according to claim 1, characterized in that that a pipe drawn through a round die or a round rod by rotating the workpiece around the longitudinal axis inclined cutting teeth receives. 4. Process for the production of files according to claim 1, characterized in that that a pipe or a sheet metal bent into a pipe by means of drawing is provided with cutting teeth on both sides through a round die and a round mandrel, whereupon the The workpiece is rolled up and cut into pieces the width of a file. 1 sheet of drawings