In recent years, there are still many problems in the domestic pump valve industry. Many key valves with high parameters are also imported. In terms of welding process, German KSB company has widely used special welding powder for cobalt free welding in order to meet the radiation resistance requirements of sealing materials for nuclear class valves; French Weilan valve company completes pre welding preheating, automatic welding and post welding treatment in the same equipment or the same processing production line, and the temperature can be automatically controlled to ensure welding Connect quality.
However, the domestic valve welding process is backward, and some of them still use old welding methods. The welder's technical level is low, and the welding materials are common materials, which can not meet the design requirements of special valves. Many enterprises are busy with production and marketing all day long, and seldom study and improve the technology.
The sales volume of Bernard electric equipment company in 2005 was 300 million yuan, and the export accounted for 70% of the sales. It has established a global sales network. China's metallurgical, paper-making, water treatment and oil and gas pipeline valves use the company's electrical products.
In the field of nuclear power, they have the second largest supply in the world, and more than 70 nuclear power plants in France use their products. Their management is in place, the company's parts processing record sheet flows with the parts, the production site is neat and tidy, and the two assembly lines are working orderly. Their screw rod processing adopts rolling method, with high efficiency and high surface finish of parts. After processing, the parts are cleaned in time, and the working position apparatus is applied properly. For example, a plastic bag is set on each shaft, which is very simple but practical, avoiding the collision and scratch between parts. The painting method of the parts is similar to that in China, but due to the smoothness of the blank and the excellent quality of the paint, the appearance and quality of the products after spraying are quite good.
In contrast, there are many defects in quality management in China. Firstly, they are more or less ignored in the process. Many enterprises clearly have quality assurance system, but they have no use in actual work. Quality management is carried out on its own and at will. Secondly, it is careless in the assembly process. It is no wonder that some valves run, emit, drip and leak as soon as they are installed.
The layout of the equipment of the company is carried out according to the product process route, so as to achieve the shortest processing route, so that the operator can complete the workpiece processing within the minimum range of action. A large number of them have adopted machining centers and even five axis flexible machining centers, CNC turning and milling machines and CNC numerical control machines, which connect computer-aided manufacturing into a line, and product clamping and programming once on the equipment. The programming work can even be operated remotely in the office, which simplifies the machining process. As long as the engineers and technicians compile the programs and select the appropriate tools, they can ensure the processing requirements of the products and make the products of high quality and high efficiency.
