GB2037206A

GB2037206A - Apparatus for drawing, cooling and coiling wire

Info

Publication number: GB2037206A
Application number: GB7931755A
Authority: GB
Original assignee: Schwermaschinenbau Kombinat Ernst Thalmann VEB
Current assignee: Schwermaschinenbau Kombinat Ernst Thalmann VEB
Priority date: 1978-10-18
Filing date: 1979-09-13
Publication date: 1980-07-09
Also published as: IT1122655B; DD139095B1; DE2928493A1; DD139095A1; GB2037206B; HU184203B; IT7924767A0

Abstract

The apparatus comprises a fixedly located drawing die 9 and a cooling and drying unit 10 downstream of the die. A direction-changing roller 5 is provided at the inlet to the drawing die 9 and is rotatable to induce twist into the wire 1. The die is arranged coaxially with a coiling shaft 3 having a disc 4 and rollers 6 and 7. The twist induced in the wire is removed by the drawing die and coiling is effected using the rotatable coiling shaft 3 and the coiling disc 4. The coil of wire wound on to the coiling drum is stationary and free from twist. <IMAGE>

Description

SPECIFICATION Apparatus for drawing, cooling and coiling wire The invention relates to apparatus for drawing, cooling and coiling wire, in which the drawn wire is wound without being twisted to form a stationary coil.

In known drawing and coiling machines, wires can be wound at high speeds to form large coils. The coil of wire remains stationary and this causes a twisting of the wire during coiling. When coiling is carried out at high speeds to provide large masses of wire, the stationary coil offers considerable advantages. The twisting that is associated with the method and constitutes a disadvantage of the stationary coil system is compensated by the application of tension during one of the drawing stages, so that even high-strength wires, such as cable and spring wires, can be wound on the drawing and coiling machines.

A particular problem however, is, on the one hand, that of cooling the drawing tool rotating with the coiling shaft and the coiling disc and, on the other hand, that of cooling the wire wound on to the coiling drum. Cooling in particular has a special influence on the entire process. Whereas cooling of the die has an important effect upon lubrication and die wear, cooling of the drawn and coiled wire influences its quality since if cooling is insufficient or unreliable, deterioration or quite marked variations in the plastic properties occur as a result of strain ageing.

The known water-cooling of the die is complicated in drawing and coiling machines by the need to supply cooling water to, and conduct it from, the coiling shaft and coiling disc by way of rotating ports and the system calls for constant supervision. For this reason, it has been proposed to cool the drawing die by means of a cooling system which rotates with the coiling disc and which consists of a heatexchanger for discharging heat into the atmosphere, and of a cooling-water circuit connected to the heat-exchanger and the drawing die. This system is also very complicated.

The known variant involving water-cooling of the coiling drum is accompanied by similar problems since, because of the special kinematic construction of a drawing and coiling machine, the entire cooling system becomes complicated.

For this reason, use is generally made of additional air cooling for cooling the coil of wire, or of air cooling alone with all its known disadvantages such as a reduced cooling effect, considerable noise and swirling dust.

According to the present invention there is provided apparatus for drawing, cooling and coiling wire, comprising a fixedly located wire drawing die and a cooling and drying unit downstream of the die, a direction-changing roller provided at the inlet to the drawing die, means for rotating said roller bodily about the axis of the drawing die to impart twist to the wire, a rotatable coiling shaft coaxial with the die and cooling and drying unit, a disc rotatable with the shaft and direction-changing rollers rotatable with the shaft and disc, and means for rotating the shaft and disc together with the roller at the inlet to the die.

An embodiment of the invention provides apparatus for drawing, cooling and coiling wire, in which apparatus direct cooling followed by drying takes place, and the wire is coiled without becoming twisted.

In a preferred embodiment the coiling shaft, together with the coiling disc and the directionchanging roller at the inlet to the die are driven by gear wheels so that a rotary movement is imparted to the wire in synchronism with that of the coiling shaft and coiling disc.

The drawing die is preferably secured coaxially in the drawing unit, and the contiguously disposed cooling and drying unit consists of a container divided into two chambers, the first chamber following the drawing unit being filled with a cooling fluid, and the second chamber being a vacuum chamber.

The wire fed to the wire-drawing machine is guided over the direction-changing roller secured at the inlet to the drawing and coiling machine, and a rotary movement is imparted to the wire that is in synchronism with that of the coiling shaft and coiling disc. The rotary movement is preferably produced by means of a drive and suitable gear wheels. The wire to be coiled passes from the direction-changing roller into the drawing die coaxial with the coiling shaft and of fixed location on the frame of the drawing and coiling machine, and is there lubricated and undergoes plastic deformation as a result of passing through the drawing die, so that the twist introduced into the wire is removed.After leaving the drawing unit, the wire passes immediately into the cooling and drying unit and is directly cooled and dried so that it is passed through the hollow coiling shaft to the coiling disc by way of the two directionchanging rollers and is wound on a horizontally mounted coiling drum free of twist. The drawing force is transmitted by the wire from the coiling drum to the drawing die by way of the two direction-changing rollers.

An embodiment of the invention will now be described, by way of an example, with reference to the accompanying drawing, in which the single figure is a diagrammatic illustration showing the principal parts of the drawing and coiling machine together with the apparatus for drawing and cooling the wire.

The figure shows, not in detail, that the wire 1, being wound on a drawing and coiling machine, leaves the drawing machine and passes to the coiler.

The apparatus of the invention consists of a direction-changing roller 5, which is secured at the inlet to the drawing and coiling machine to a rotating wheel 15 and over which roller 5 the wire 1 is passed and becomes twisted because of the rotary movement of the wheel 15. The rotary movement of the wheel 15 is produced by a drive, not illustrated in detail, which includes gear wheels 12; 1314; 15. Thus the same rotary movement is imparted to the wire 1 which consequently moves in synchronism with the coiling apparatus. Arranged in a fixed location on the frame 2 of the drawing and coiling machine are a drawing unit 9 and a cooling and drying unit 10.The wire 1 is guided by the direction-changing roller 5 into the drawing unit 9 where it is first covered with a lubricant before it is passed through and is plastically deformed by the coaxially arranged drawing die 11. At the same time, the twist in the wire 1 is thus compensated, so that the wire 1, although rotating, is directly cooled and dried, free from twist, in the cooling and drying unit 10. This again can take place because the cooling and drying unit 10 is disposed contiguously with the drawing unit 9. The unit 10 consists of a container which may consist of two chambers 16 and 17, one filled with cooling fluid and the other designed as a vacuum chamber.

After leaving the cooling and drying unit 10, the wire 1 passes into a hollow cooling shaft 3 and is guided, by way of two direction-changing rollers 6 and 7, to the coiling disc 4 and is finally wound on to the coiling drum 8 free from twist.

Claims

1. Apparatus for drawing, cooling and coiling wire, comprising a fixedly located wire drawing die and a cooling and drying unit downstream of the die, a direction-changing roller provided at the inlet to the drawing die, means for rotating said roller bodily about the axis of the drawing die to impart twist to the wire, a rotatable coiling shaft coaxial with the die and cooling and drying unit, a disc rotatable with the shaft and direction-changing rollers rotatable with the shaft and disc, and means for rotating the shaft and disc together with the roller at the inlet to the die.

2. Apparatus for drawing, cooling and coiling wire as claimed in claim 1, in which the coiling shaft, together with the coiling disc and the directionchanging roller at the inlet to the die, are driven by gear wheels so that a rotary movement is imparted to the wire in synchronism with that of the coiling shaft and the coiling disc.

3. Apparatus for drawing, cooling and coiling wire as claimed in claim 1, or claim 2, in which the drawing die is coaxially secured in the drawing unit, and the contiguously arranged cooling and drying unit consists of a container divided into two chambers, the first chamber following the drawing unit being filled with cooling fluid, and the second chamber being a vacuum chamber.

4. Apparatus for drawing, cooling and coiling wire, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.