Forming method of contact wire

Abstract

The invention discloses a forming method of a contact wire. The forming method comprises the following steps that S1, a raw material wire rod is loaded into an uncoiler; S2, the raw material wire rod is corrected and straightened through a straightening device to obtain a straightened wire rod; S3, the straightened wire rod is subjected to roller drawing deformation through a roller drawing die device, and the finished contact wire of a preset specification is obtained; and S4, the finished contact wire is coiled by a coiling machine. By means of the forming method, the large-length, high-strength and high-conductivity contact wire is formed in a roller drawing mode, the drawing force is reduced by about 2 / 3 when a roller drawing die is used for drawing the contact wire at the same deformation, the drawing force in the drawing process is greatly reduced, the forming speed is increased, the service life of a grinding tool is prolonged, the surface quality of the contact wire is improved, the problems that an original drawing die of the high-strength contact net wire is short in service life, low in production efficiency and poor in surface quality of the contact net wire due to large deformation resistance of a high-strength line blank are solved, and the quality requirement of the high-strength and high-conductivity contact net wire is met.

Description

technical field [0001] The invention relates to the technical field of railway catenary wire manufacturing, in particular to a forming method of a catenary wire. Background technique [0002] During the high-speed operation of the train, it is necessary to transmit power to the train through the sliding friction between the upper contact wire and the pantograph. The performance of the contact wire directly affects the operation safety of the electric locomotive, which is called the "lifeline" of the high-speed rail. [0003] With the rapid development of electrified railways, the requirements for contact wires are getting higher and higher, high strength, high conductivity, high strength can increase the safety and stability of train operation, and high conductivity can save power loss during transmission . [0004] The materials currently used mainly include copper-silver alloy, copper-tin alloy, copper-magnesium alloy and copper-chromium-zirconium alloy. Among them, copp...

AI Technical Summary

Problems solved by technology

This aging-strengthened copper-chromium-zirconium alloy uses aging strengthening to precipitate nano-sized particles to increase the strength of the material and ensure the strength of the material. This type of material has an outstanding matching relationship between strength and electrical conductivity, but this type of alloy has a deformation process. High deformation resistance, difficult production control, high cost, unstable mass production quality and other difficulties

[0005] Considering product performance and contact wires, there should be no requirements for continuous production of welded joints. It is extremely difficult to adapt to the high strength of chrome-zirconium copper alloy with traditional fixed drawing dies, and it is easy to be worn, resulting in low life of drawing abrasives and often needs to be replaced. , it is impossible to continuously produce contact wires that meet the production length requirements of contact wires, the cost increases, the productivity is low, and the surface quality of the drawn contact wires is poor, not smooth enough, and cannot meet the standard requirements; the cross-sectional shape of the contact wires is not a complete circle shape, it has suspension grooves and identification grooves for alloy types, such as Figure 8 , the groove above the contact line is the identification groove of the alloy type. To form the identification groove of the alloy type during the drawing process, it is necessary to set corresponding protrusions on the drawing die. The strength of the chrome-zirconium-copper alloy is high. The protrusions are easy to be worn, resulting in a short service life of the drawing die; if the original rolling form is directly used, the surface quality of the drawing contact line can be smooth to meet the requirements, but it is easy to A small ridge is formed on the contact line, which cannot meet the requirements of the contact line. If grinding is used again, the high strength of the chromium-zirconium copper alloy is time-consuming and labor-intensive. The production efficiency is low, and the quality of the contact line is also difficult to control. Therefore, the development of a It is very important to form a contact wire molding method that saves time and effort and can meet the surface quality requirements of the contact wire.

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