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| The manufacture of cables is quite different from the way in which most electromechanical products are manufactured. Mechanical and electrical products are usually assembled into components, parts, and then assembled into a single product, the number of units or pieces of measurement. Wire and cable are based on length as the basic unit of measurement. All wires and cables are processed from conductors. Wires, cables and products are formed on the periphery of the conductor with layers of insulation, shielding, cables and protective coatings. The more complex the product structure is, the more layers are superimposed. First, the wire and cable products manufacturing process characteristics: 1. large length continuous superposition combination production mode The influence of continuous production with large length and continuous superposition on the production of wire and cable is overall and controllable, which involves and affects: (1) production process and equipment layout; Various equipment in the production workshop must be discharged reasonably according to the technological process required by the product, and the semi-finished products in each stage shall be transferred in sequence. Equipment allocation should take into account the production efficiency of different production capacity balance, and some equipment may have to configure two or more units in order to enable the production line to balance production capacity. Therefore, the reasonable selection of equipment and the layout of production sites must be balanced and comprehensively considered according to the product and output. (2) production organization management; Production organization and management must be scientific and reasonable, strict and meticulous, careful and accurate, the operator must be strict in demands to according to the requirement of process execution, any link problems, will affect the process smooth, affect the quality of products and delivery. In particular, multi-core cable, a line or the basic unit length is short, or quality problems, then the entire cable will not be enough length, resulting in scrap. Conversely, if a unit is too long, it must be sawed to make waste. (3) quality management The production mode with large length, continuous superposition and combination makes any link in the process of production and instantaneous problems occur, which will affect the quality of the whole cable. The more the quality defects occur in the inner layer, and the greater the loss will be if they are not found in time to stop production. Because the wire and cable production is different from the assembled products, can be disassembled and replaced the other parts; any part or process quality problems of wire and cable, is almost unable to restore and remedy for this cable. After the event, the processing is very negative, not sawing short, that is, demotion, or scrap the entire cable. It cannot be disassembled and reloaded. Wire and cable quality management, must run through the entire production process. The quality management inspection department should check the whole production process, check the operator's self inspection, and check the process up and down. This is an important guarantee and means to ensure the quality of products and improve the economic efficiency of enterprises. 2., a wide range of production processes, large material flow Wire and cable manufacturing process involved a wide range of categories, from non-ferrous metal smelting and pressure processing, plastic, rubber, paint and other chemical technology; fiber material winding, weaving and other textile technology, metal materials and metal strip wrapped package, longitudinal welding metal forming process and so on. Wire and cable manufacturing materials used, not only categories, varieties, specifications, and large quantity. Therefore, the amount of materials, the amount of preparation, batch cycle and batch must be approved. At the same time, the waste decomposition, treatment, recycling, reuse and waste disposal as an important part of management, do a good job of material quota management, pay attention to saving work. In the production of wire and cable, from the raw materials and various auxiliary materials in and out of storage, the transfer of each process and semi-finished products to the storage and delivery of the products, the material flow is large, it must be properly arranged and managed dynamically. 3., more dedicated equipment Special equipment for making use of wire and cable technology has the characteristics of the industry to adapt to the requirements of the structure and the performance of cable products, meet the continuous length as possible and the requirements of high-speed production, thus forming a series of cable manufacturing equipment. Such as extrusion machine series, wire drawing machine series, stranding machine series, winding machine series, etc.. The manufacturing process of wire and cable is closely related to the development of special equipment and promotes each other. New technological requirements promote the emergence and development of new special equipment; in turn, the development of new special equipment has improved and promoted the popularization and application of new technology. Such as wire drawing, annealing, extrusion line, physical foaming production line and other special equipment, to promote the development and improvement of wire and cable manufacturing process, improve the quality of cable products and production efficiency. Two, the main process of wire and cable Wires and cables are manufactured by three processes: drawing, twisting and coating. The more complicated the specifications are, the higher the repeatability is. 1. drawing In metal pressure processing. The metal is forced through a die under the action of external force (roller), metal cross sectional area is compressed, processing techniques and get the required shape and size of the cross-sectional area called metal drawing. Drawing process: single wire drawing and twisting drawing. 2. fold system In order to improve the softness and integrity of the wires and cables, more than 2 single wires are interwoven together in the prescribed direction, called the stranding system. Stranding process: conductor stranding, cabling, weaving, and winding steel wire armoring. 3. coating According to the different performance requirements of wires and cables, special equipment is used to cover different materials on the outside of the conductor. Coating process: A. packs: rubber, plastics, lead, aluminum and other materials. B. longitudinal package: rubber, wrinkled aluminum belt material. C. wrapping: strips of tape, ribbons, E-glass tapes, non-woven fabrics |
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