Precision pressing technology of four-column press

Abstract

In order to improve the forming accuracy of grinding wheel, the pressing method of the four-column press for grinding wheel was investigated, tested, carded and analyzed. It was found that the traditional press generally had the phenomena of three centers with different shafts, easy unbalance loading pressure and uneven guidance during pressing. Based on the principle of linear transmission of force, a new scheme of pressure-center pressing was proposed, and a new test press was made and subjected to pressing tests. The new press removes the four-column guiding function, improves the system rigidity, redefines the position of the pressure-center, and completely eliminates the interference of all additional moments. The results of the batch forming test of grinding wheel show that the thickness difference of grinding wheel blank is reduced by 10.3% to 16.5%. The pressure-center pressing method is obviously superior to the traditional press pressing method, and is suitable for the near-net-size forming of small size products.

Keywords

• four-column press
• pressing technology of pressure center
• molding
• eccentric load
• precision