1) with the energy crisis becoming more and more serious, people will pay more attention to the quality of the environment, coupled with the increasingly fierce market competition, promote the development of forging production efficiency, high quality, refined, energy saving direction. Therefore, using extrusion forging refining technology means the production yield, greater development in the market competition will be.

2) the vehicle to light, high speed, stable direction of development, the size accuracy of the forging, weight precision and mechanical properties, and so put forward higher requirements. As the car engine connecting rod forgings in addition to the requirements of large error between the weight of the head, each error also requires less than eight grams. High demand for new products, will promote the development of refined production process.

3. The development direction and trend of the specialization and scale of the production is still the cold extrusion production. In France, the extrusion forming process of forging production of professional manufacturers 19911994 years of labor productivity, the per capita production yield and output value of extrusion parts, manufacturers were higher than the general production of die forging or free forging. In 1994, for example, the per capita production of professional manufacturers of 51024KG, the output value of 775688 francs. In the same period, the general production of die forging manufacturers, their average output is only 39344KG, the output value of 592384 francs, equivalent to only 77.1% and 76.37% of the professional manufacturers of extrusion. Compared with the free forging production plant is lower.

4) extrusion plane will become a development trend. With the development of small and medium-sized forging refined production and application of cold extrusion, warm extrusion technology, multi station cold extrusion press, precision press and a forging and the design and manufacture of the plane will be to develop.

Definition and classification of cold and warm extrusion

Extrusion is a process for producing a hollow or section blank section to be smaller than a blank section, by forcing the metal chip to produce plastic flow through the gap between the convex die and the concave die. If the blank is pressed without heating, it is called cold extrusion. Cold extrusion is one of the parts of the chip and the chip, so it is a kind of advanced technology in the plastic processing. If the blank is heated to recrystallization temperature below the temperature of extrusion, it is known as the warm extrusion. Warm extrusion still has the advantage of little chip removal.