Auto Cold Drawing Machine

 Auto cold drawing machine is a chain-type machinery that draws metal tubes and bars for a variety of industrial applications. It can draw round, hexagonal and square steel tubes with a wide range of wall thickness and diameters. The machines can achieve low error tolerances and high efficiency. They can also draw wires of high tensile strength, stainless steel and various alloys. They are available in heavy-duty models for drawing linear guideways and other symmetrical profiles.


The cold drawing process squeezes and deforms the material to make it smaller. This decreases the cross-sectional area of the material and increases the length. It is important to keep in mind that the drawing force must be less than the tensile strength of the material. Moreover, the drawing process must also be able to overcome friction in the deformation zone. The drawing force depends on several factors, including technological parameters such as die half-angle, draw speed and back tension. It is essential to calculate these factors in order to design a drawing route that meets the requirements of each particular material.


In some cases, it is necessary to increase the lubrication of the draw block to reduce frictional losses. A special type of lubricant can be used for this purpose. This lubricant is not only effective but also environmentally friendly.


It is also necessary to improve the performance of the drawing block by adding a cooling system to prevent the heat generated during the drawing process. This type of equipment can significantly reduce the temperature of the drawing block and increase its service life. This is especially useful for large-diameter wires and thick rods, which are difficult to draw with a conventional block.


The design of the drawing machine is also a factor in its effectiveness. The use of a water-cooled block with a narrow-gap capstan can increase the wiredrawing speed by 45% and, when combined with an air blast, can reduce the heat load on the drawn wire by 35%. In addition, a casting block made of special materials can provide greater strength without sacrificing wear resistance.


For high-strength and/or larger-diameter wires, forced air-cooling is often added to the drawing machine. This method forces air to travel up the surface of accumulated wire, thereby introducing air into the gaps between the wire rings. However, this approach is expensive to install and operate because it requires large fans that consume energy. It also disperses airborne drawing soap around the machine, which can cause environmental problems.


Another way to improve the performance of a drawing machine is by using an accumulator block on the first position of the rod breakdown machine. This system imparts one twist per wrap of wire leaving the drawing block, which reduces the tendency to build a snarl. An accumulator can also provide an extended run time during a rod breakdown. This type of system requires the use of individual drive motors for each drawing block, but it can be much more flexible than a conventional rod breakdown machine.Auto cold drawing machine


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