Introduction
Wire drawing is a process that involves the reduction of a cross section of the material and stretching it to its full length. This process is used to make many products, from fishing lures to drawing tools to medical implants. Wire drawing is an important process in the production of electrical wire and cable because it can reduce the amount of material that needs to be added during the manufacturing process. Wire drawing is also used to reduce the material thickness of wire and cable before any other processing, such as electrical insulation or connector application.
Wire drawing is usually performed with a die that consists of two parts: the die body and the die insert. The die body consists of a chamber in which the die insert is placed. The die insert contains grooves that determine the shape of the material in the finished product. The die body is designed to hold the die insert in place while the material is being drawn through it.
The goal of wire drawing is to reduce the cross section of the material while maintaining its length. The process involves pulling the material through a die that has been specially designed to reduce the cross section of the material. As the material passes through the die, it is reduced in size, but the length remains unchanged. During the wire drawing process, lubrication is added to decrease the friction between the material and the die. This reduces wear and tear on the equipment, as well as prevents the material from sticking to the die.
Wire drawing can be performed by different types of equipment, depending on the product being manufactured. Some of the most common types of machines used for wire drawing include rod and tube drawing machines, wire drawing machines, spring making machines, and single-point and multi-point machines. All of these machines use a die to shape the material as it is drawn through.
One of the most important inspection procedures used in the wire drawing process is a pull test. This type of test measures the amount of force required to pull and elongate the material. Pull tests are used to determine the strength of the material, as well as the overall quality of the product. Pull tests are usually performed on all types of wire and cable products, including but not limited to electrical wire, automotive wiring, and data cables.
The pull force is determined by measuring the elongation or change in length of the material after it has been subjected to the pull force. Generally, the higher the pull force is, the higher the elongation of the material will be. If the elongation is not within the specified range, the product is rejected.
Conclusion
Wire drawing is an important process in the production of electrical wire and cable, as it helps reduce the amount of material that needs to be added during the manufacturing process. To ensure that the claims of strength and quality are met, a pull test is usually performed on the wire and cable products. In the pull test, a force is applied to the material, and the amount of elongation or change in length is measured. If the elongation is not within the specified range, the product is rejected.
