Cold pilgering and cold drawing are both metalworking processes used to reduce the diameter and thickness of metal tubes and pipes, but they use different techniques to achieve this.
Cold drawing is a process where a metal tube or bar is pulled through a die to reduce its diameter and increase its length. The process involves pulling the metal through a series of dies that progressively reduce its diameter and increase its length. The process is called cold drawing because it is done at room temperature, without the use of heat.
Cold pilgering, on the other hand, is a process where a metal tube or pipe is rolled between two rollers to reduce its diameter and thickness. The rollers are tapered and the gap between them decreases as the tube is rolled through the mill. The process is called cold pilgering because it is done at room temperature, without the use of heat.
The main difference between cold drawing and cold pilgering is the way the metal is processed. Cold drawing pulls the metal through a die, while cold pilgering rolls the metal between two rollers. Cold pilgering is typically used for high-precision applications where a high degree of dimensional accuracy is required, such as in the aerospace and nuclear industries. Cold drawing is more commonly used in the manufacturing of everyday objects like wires, pipes, and tubes.