The Cold drawing machine is used to shape and reduce the cross section of steel bars or coils. It is generally annealed between the drawing passes to remove cold work and increase ductility.
To determine the dependence of tensile strength and yield strength on cold working, a mathematical program was constructed in Excel. This helped to improve the accuracy of calculation results.
Preparation
The first step in the cold drawing process is to coat the material with a lubricant to aid in the drawing. The lubricant also helps reduce the heat generated during the drawing process.
Next, the pointed end of the bar or coil is reduced in size by swaging or extruding to fit the die opening. The resulting shaped product exhibits a bright finish and increased mechanical properties. The drawn products are also characterized by precise and uniform dimensional tolerances.
To achieve the required shape and tolerances for complex wire profiles, the bars or coils may be drawn several times, each time through a smaller die opening. The resulting drawn material is often annealed between each draw pass to remove cold work and increase ductility.
Lubrication
The process of drawing a wire causes significant heat that affects the lubricants ability to ensure quality wire production. Understanding this heat distribution and the effects on lubricants is critical in designing the right lubricant to meet these demanding conditions.
TY Metal continuously invests in its machine equipment to produce the highest level of precision drawn wires. Drawing is the process of pulling a rod through a die to reduce its cross sectional size. The lubrication process for a Cold drawing machine is critical in this process.
Typically the lubrication is either a soap solution or an emulsion. Soap liquid is a mixture of sodium or potassium soap and water, while an emulsion consists of mineral oil in water with an emulsifier. Both types provide lubrication, cooling and cleaning of the steel wire surface.
Lead Ends
There have been consistent evolutionary advances in drawing machine technology over the years. New equipment designs such as internal water-cooled drawing capstans have helped increase wire-drawing speeds and productivity.
The basic work flow of a drawing machine is to receive sharpened rod and gradually reduce its diameter through a series of die and capstan combinations. Each reduction step is achieved by drawing the rod into a narrower hole or space, and the process is completed when the desired drawn steel wire size is obtained.
Besides the conventional method of payoff, there are other types of rod feeding systems such as the boom flipper and the stationary horizontal rod payoff (see Fig Y14). Other advancements include a mechanical soap stirring system that provides adjustable agitation of the powdered drawing lubricant to help prevent tunnelling.
Drawing
Cold drawing is the process of pushing steel bars through a die to manipulate the shape and size. This can be done several times to create a precise shaped cross-section. The resulting material has improved machinability, increased strength and tighter tolerances than hot extruded metals.
In addition to reducing the diameter of the steel, the cold drawing process can also change its surface state from black to bright wire. This can be important for applications like barbed wire, bailing wire and barrier strand.
Schmidt Maschinenbau GmbH single wire drawing machines are custom designed for your specific requirements. This eliminates the restrictions of conventional drawbench technology, such as a limited length limit on the drawn workpiece. This allows you to maximize the use of your raw materials.
Finishing
When a rod or bar is cold drawn, the process typically involves multi-pass drawing. This means the steel bars are drawn through smaller and smaller dies. Between each drawing pass, the steel is usually annealed to improve ductility.
During the drawing process, metalworking companies submerge the lead ends in lubricant. The lubricant helps the lead ends to travel through the die and stretches them to make them longer and thinner.
The lubrication and the cold drawing process realign the molecules in the steel to increase its strength. It also reduces the diameter of the steel bar. It is used for a variety of industrial applications and requires a high level of precision. It also helps manufacturers to improve their cash flow by reducing their work-in-process inventory.
