DE583160C - Device for cutting up cast blanks used for the production of piston rings using a circular knife - Google Patents

Description

In the manufacture of piston rings it is known to use a cast blank-in two or more to disassemble several individual rings. So far this has been done in such a way that the ring goes through thin Saw knife was cut. But this creates a considerable waste, namely in the case of relatively small and narrow rings, a large part of the amount to be expended Material represents. The procedure also takes a lot of time, and the ones used Saw knives are expensive and wear out very easily.

In accordance with the present invention, an apparatus is now used which has two or more has opposing circular knives, in a similar way to how they are used for cutting pipes in the known pipe cutting devices, one Knife pair is driven. In order to now have a precise guidance of the blank to be cut To obtain, two guide washers are provided on the inside of the blank lying circular knife shaft sit and which are with the blank taken by the circular knife turn. This ensures precise lateral guidance of the blank and the circular knives can then scratch the ring on both its outer and its inner surface and it by the further contact pressure exerted on it exactly at the predetermined one Break the body into two or more individual rings. A 'clamping of the blank is not necessary because the blank lies freely between the lateral guide washers. When separating the blank into individual rings, only a little material is lost because the cutting knife Only scratch the material with your cutting edge and then break it apart, with the Using circular knives, the width of the knife determines the cutting width.

Two example embodiments of this device are shown in the accompanying drawings shown, namely shows

Fig. Ι the ^{cutting device with driven 4} S nem inner cutting knife.

Fig. 2 shows a second embodiment, in which the cutting device with driven outer cutting knife works.

Fig. 3 shows the double ring in section with the separating cracks. ,

On the shaft α sits the cutting knife b, onto which the piston ring c is inserted between two guide disks d, e. From the outside, the outer separating knife b _x lies in the separating line XX under pressure against the ring. If the shaft α is then driven, the knife edges penetrate the ring from both sides and, after a short incision, cause it to explode.

In the embodiment according to Fig. 2, the outer cutter disk b is driven, otherwise the arrangement is the same.

One or both cutter disks must be adjustable in the cutting direction in order to effect the advance and to enable the rings to be inserted. For this purpose, the rotatable counter knife O ₁ is mounted in a slide which can be moved by the pressure of a hand lever g or by weight or spring.

The arrangement can also be multiplied so that by attaching several Knives side by side at the same time a row of double or triple rings into single rings can divide. If necessary, the device can also be used by a longer cast cylinder to separate individual rings at the same time or one after the other.

Finally, instead of using a pair of cutting blades, you can use several arrange such distributed on the circumference of the ring.

Claims (1)

Claim: Device for the cutting of cast, for the production of piston rings serving blanks into two or more individual rings by means of two or more opposing circular knife, characterized in that the lateral Guiding of the blank carried along by the circular knives on the circular knife shaft lying within the blank two Guide washers are provided. 1 sheet of drawings