SU367945A1 - ALL SESSION - Google Patents

Description

one

The invention can be applied for the production of preheaters.

A known method of manufacturing bifillary spirals is that the wire bar attached to the core is reported to move along a helix through rotational and translational movement of the core (needle).

However, using this method it is not possible to obtain bifillary spirals of relatively large length, with wounding my wire smaller, equal to or slightly larger than the diameter of the core corresponding to the inner diameter of the bifillary spiral, i.e. with the ratio of core diameter and twisted wire close to unity.

The proposed method does not have these drawbacks and differs from the known one in that the workpiece is fixed on the core with its middle part, and the ends are bent to position its branches parallel to the core axis, and then pass along with the core through the rotating die.

The invention is illustrated in the drawings, which show successive steps in the manufacture of bifillary spirals.

First, the forming of the wound elements is carried out before the resizing (Fig. 1). For this, the winding wire U is fixed in the middle part on core 2, the protruding

from the die 3. The free end of the winding wire 1 extends from one slot of the die 3, from the side indicated by arrow A, by the amount of the helix section taking into account

the length of the pin and is threaded into the other groove of the spinneret 3, overlapping the protruding end of the core. Then, the position of the wound and actuating elements is changed before spiraling (Fig. 2). Naviva wire}

with kerio.m 2 are in filler 3 and fixed with jaws 4, and the ends of the wire are bent to a position parallel to the core axis.

During the spiraling process (Fig. 3), the wire with core 2 is pulled through the rotating die 3 with jaws 4.

Next, the pins are molded (Fig. 4). For this, the wire / core 2 is pulled through a fixed sponge die 3; And 4.

During the removal of the bifilary helix (Fig. 1), the winding wire 1 with core 2 is cut off. At the same time, the die 3 with its sprained lips 4 is fixed. Pa based on the described method was created

machine for winding bifilny spirals on a continuous core.

The way allows for wound relatively long bifilary spirals. With this ratio of core diameter and wound wire can be close to. it