Among the tools used in the domestic hardware manufacturing industry, the proportion of cemented carbide tools has reached more than 50%, and the problem of disconnection between the supply and demand structure has become very serious. The consequence is that a large number of high-speed steel cutters that are surplus are exported at a low price or sold domestically. At the same time, high-efficiency carbide cutting tools have to rely on large amounts of imports. The import volume has increased from 0.9 billion US dollars in 2001 to 450 million US dollars in 2005. 3.6 billion ***). According to Luo Baihui, the secretary-general of the International Model Association, China’s current annual sales of tools are 14.5 billion yuan, of which cemented carbide tools account for less than 25%, which is not only far from the structure of international market tool products, but also can not meet the domestic manufacturing industry. The increasing demand for carbide tools.
China currently produces about 80,000 tons of high-speed steel annually, which accounts for about 40% of the world's total production, and consumes a large amount of valuable rare resources such as tungsten and molybdenum. This kind of blind expansion and low-level repetition has resulted in a large surplus of high-speed steel cutters and has to be sold at low prices, which has resulted in a large number of tool-manufacturing companies having low efficiency.
China currently produces 16,000 tons of cemented carbide annually, which also accounts for about 40% of the world's total production. However, the highest added value of cutting inserts in hard alloy products is only 3,000 tons, accounting for only 20%. This situation, on the one hand, led to insufficient supply of cemented carbide tools that are urgently needed in the country. On the other hand, the precious carbide resources have not been fully utilized.
In terms of economic efficiency, China’s annual sales revenue of cemented carbide is about 560 million U.S. dollars; Japan is only 40% of China’s output, but sales revenue is as high as 2.633 billion U.S. dollars, among which blade (tool) accounts for 72% of the total, making resources available. With full use, the company has also obtained good benefits. China's tool industry should get some useful inspiration from it.
Ball valve is evolved from the plug valve, its opening and closing parts as a ball, using the ball to rotate 90 degrees around the axis of the stem to achieve the purpose of opening and closing, the difference is that the cock body is a ball, with a circular through hole or channel through its axis. The ratio of the sphere to the passageway should be such that when the ball is rotated 90 degrees, the inlet and outlet should be completely spherical, thus cutting off the flow.
The role of ball valve in the pipeline is mainly used to cut off, distribute and change the direction of media flow, designed into the V-shaped opening ball valve also has good flow regulation function.
Ball valve is not only simple in structure, good sealing performance, but also in a certain nominal range of small volume, light weight, less material consumption, small installation size, and driving torque is small, easy to operate, easy to realize rapid opening and closing, is one of the fastest developing valve varieties in recent decades. Especially in the United States, Japan, Germany, France, Italy, West, Britain and other industrial developed countries, ball valves are widely used, the variety and number of use is still continuing to expand, and to high temperature, high pressure, large mouth, high sealing, long life, excellent regulatory performance and a valve multifunctional direction, its reliability and other performance indicators have reached a higher level, And has partially replaced Gate Valve, Globe Valve, Regulating Valve.
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