How to control the quality of unarmored large-section single-core cables
Release time:
2018-06-11
With the fierce market competition and the continuous development of the wire and cable industry and the continuous improvement of users' awareness of the quality of cable products. The user's demand for cable products is not only the price and cost of a single product, but also pays more attention to the internal and external quality of the product. The required product not only requires its intrinsic performance to comply with the corresponding production technical standards (GB, JB, MT….), but also pays special attention to the appearance quality of the product, such as the appearance of the product
With the fierce market competition and the continuous development of the wire and cable industry and the continuous improvement of users' awareness of the quality of cable products. The user's demand for cable products is not only the price and cost of a single product, but also pays more attention to the internal and external quality of the product. The required product not only requires its intrinsic performance to comply with the corresponding production technical standards (GB, JB, MT….), but also pays special attention to the appearance quality of the product, such as the appearance of the product
There should be no bad phenomena such as convex hulls, concave points, coke seeds, cold lumps, rough wire drawing, and no pores in the profile. The occurrence of these bad situations will cause users to be dissatisfied with the batch of cables, raise doubts about the quality of the company's products, often lead to user complaints or affect the corporate image and impact on the corporate market. In this paper, the author combines the experience and experience of dealing with the damage of the outer sheath of the unarmored large-section single-core cable.
Its practical experience in production puts forward some superficial views on the quality problems, cause analysis and quality control of unarmored large-section single-core cables in the production process.
Characteristics and technological characteristics of large-section single-core cables
Due to the existence of its own characteristics, the large-section single-core cable has a large cross-section, a large proportion of metal materials, and a relatively thin extruded sheath.
Large-section copper core single-core cables generally use 150 extruders to extrude the sheath when extruding the sheath. The production process is roughly: insulation extrusion (including conductor shielding, insulation, outer shielding) - copper tape shielding - Sheath extrusion.
It can be seen from the structure size table and extrusion production process of the large-section single-core copper-core cross-linked cable that the surface of the sheath needs to be cooled after the sheath is extruded. The quality of the mouth and the surface of the cable sheath at the bottom of the tray is deformed.
From the perspective of cable cooling and heat dissipation balance principle (Q release = Q suction = Q copper + Q water + Q it) and in-depth analysis of the actual production, in general, even under the same production speed and the same cooling conditions, the extrusion outer diameter is similar The armored type has better heat dissipation than the non-armored type, and its cooling effect is relatively better.
Product Quality Defect Cause Analysis and Process Control Measures
In the process of producing large-section single-core cables, the main external quality defects are the sheath wrinkling, pulling holes, breaks, coke seeds, cold lumps, rough wire drawing, steam holes in the profile, and cable sheath at the bottom of the pan. The surface is deformed, the sheath is naturally inflated after the head is inflated, and the sheath is scratched on the side of the cable reel.
In addition, during the extrusion process, due to its own fall, even if the eccentric core is adjusted, the phenomenon that the upper part is thick and the lower part is thin often appears. At the same time, due to the heat dissipation of the copper strip compared with that of the steel strip, its cooling effect is at the same extrusion speed. It is slower than the armored cable. If the cooling water tank is not fully utilized when the product is extruded, there will often be a gap between the product and the wire reel after the product has passed the spark machine. Generally, there will not be many abnormalities in the appearance of the product.
Problem, but after receiving the wire reel, because the selected reels are not all flat, and at the same time the randomness of the wiring, sometimes the cables on both sides of the wire reel will rub against the side reels of the wire reel. The cable will be twisted. If the surface of the cable sheath is not cooled enough, the cable sheath will be wrinkled. In severe cases, the cables will be scratched due to the twisting.
For the quality of large-section single-core cables. The author believes that regardless of production and use, it is necessary for manufacturers, distributors and users to have an understanding of the characteristics of cables and basic knowledge of laying, especially cable manufacturers need to strengthen reason analysis and control from the product quality process, and constantly summarize production. The abnormal phenomenon occurred in the process and cause analysis to formulate control measures, reduce product quality defects, improve the internal and external quality of products for the purpose.
Related news
