本科生毕业设计（论文）附录Spring preloading machine productsSpring industry market space:Spring is a kind of using elastic to work of mechanical parts. Generally made by spring steel. Spring is small but as a universal foundation, enormous quantity and variety to control the multifarious, sports, moderate impact or vibration energy storage, storage, measuring the size of the force, widely used in machine, instrumentation, application field of national economy almost involve all fields. But in recent years, the rapid development of Chinas national economy in China is the spring pulled the rapid growth of the industry, experts predict that this trend will continue until 2010, industry sales more than 40 million yuan. According to the analysis of spring, product demand larger market has five big: transportation, daily hardware, instruments and electronic appliances, industrial parts, export market.During transportation market pulling power strongest capitalising capitalising transportation market, including the automobile, motorcycle, engine and railway industries provide supporting and maintenance a spring, it is spring now is the most important and the most industry development prospects of market, nearly 40% of the sales of automobile industry, 2002, suspension spring demand for the 700 million million pieces, valve spring (including motorcycle, engine manufacturing), WenDingGan 1.2 million. In 2002, for these industries provide supporting and maintenance a spring total sales more than 10 billion yuan. Future capitalising capitalising on 5-7 years, Chinas automotive industry will enter the high-speed growth stage, growth will remain at 15% 25%, 2003 suspension spring demand is expected to nearly 10 million, WenDingGan demand 1.6 million. The rapid development of auto industry to spring industry produce econonmy, has become the largest user, spring and cause the attention of foreign spring one-upmanship, in addition to enter the Chinese market several foreign investment, joint ventures, and the recent Japanese clockwork spring Co., China is in the market place. Another capitalising capitalising spring industry market potential is great railway system, with the deepening of the reform of system of railway system, market gradually opening to the implementation of the plan and high-speed railway vehicle suspension system upgrading to install new shock, railway noise components, will bring huge business5 spring industry was listed companies, has mor high-speed trains, also has the fixed unit spring unit in rubber metal composite spring, suitable for high speed railway track antivibration noise reduction. Current railway system in foreign markets are beginning to open system, although the openness, but is still considerable potential. Capitalising capitalising on the next few years, motorcycle industry will have great growth, will remain at the level of 13 million cars and motorcycle suspension spring and clutch spring demand in 50 million pieces and 40 million of environmental requirement level, and the proportion of motorcycle, two strokes, four stroke rate, will give valve spring brings certain increment. Capitalising 2, daily hardware market demand capitalising capitalising daily necessities and hardware industry, including lighters, toys, lock, door hinge, machines, mattresses, sofa, etc, quantity of spring, billions of demand, technical requirement is high, the price is very low, generally by scattered across the small thegronp production, they are unique in the cost advantage, to compete with them thegronp. In recent years, domestic market for daily hardware products demand, supporting the growth, thus spring time trigger new spring enterprise birth, in the future, the market demand by 7% a year 10% speed increase. After Chinas accession to the WTO, daily hardware products export increases obviously and spring, but demand pull international market demand, the influence of trade barriers, the international market has its uncertainty. Capitalising capitalising 3, instrumentation and electrical market recovery capitalising capitalising instrumentation and electronic products such as the typical spring, spring, spring, switch brush camera spring, computer keyboard instrument accessories spring, spring, spring, this kind of leaf spring, spring, many different products material and technical requirements of the difference is very big. A few years ago domestic instrument, electronic electric appliance industry is imported products, general depression, for it is the spring manufacturer supporting by drag, recently improved tend to recovery. Capitalising capitalising 4, industrial and mining products market adjusting capitalising capitalising minerals from the market in textile cradle spring to chemical spring, power switch and rack spring, spring, etc., covering a bulldozer in transportation industry and other industries outside, the material of products, technical requirements and process of difference, an