A key part of die fittings is die spring. Die springs include: Japanese standard die springs, German standard die springs, springs and polyurethane springs. Usually, the die spring refers to a rectangular die spring. Die springs are widely used in stamping dies, metal die-casting dies, plastic dies, other elastic motion precision mechanical equipment, automobiles and other fields. Generally speaking, the material of die spring is chromium alloy steel. Chromium alloy spring steel has the characteristics of high temperature resistance, high hardness and long service life. Rectangular die spring has the characteristics of small volume, good elasticity, high rigidity, high precision, rectangular material, surface color separation spraying (electroplating) to distinguish different loads, beautiful appearance and so on. Judging from the mold, the global economy will still be in the adjustment period after the financial crisis, and the overall situation may be slightly better than that in 20 12, but the situation will still be complex and changeable, with increased risks and uncertainties, and sustained downturn and low-speed growth will remain the main tone. Bright Lo, a mold expert, said that China's economy is in a critical period of transition in the growth stage and seeking a new equilibrium. The mould market demand began to pick up, and the development trend became increasingly clear. It is estimated that China's consumption and export growth in 20 13 will be roughly the same as that in 20 12, but investment growth will face downward pressure. Although the expected GDP growth rate of about 8% is very likely, the manufacturing industry is affected by overcapacity, rising costs and low profits, so it can only be cautious and pessimistic to make growth forecasts, and it is very likely that it will be high before the whole year and then low.