Why use double press to make the power of sand washing machine?
Double action drawing press outer slide began to pressure side when the limit has been in the position of the bottom dead center (linkage sand washing machine is running speed, collinear position) slider close to zero, so the impact force and contact parts are very small. In a single press stretching at the start of the slider speed is very high, and the air cushion piston has great inertia, so the pressure side at the start of the contact impact force, caused by vibration and instantaneous piston air pressure increases, the pressing ring between the billet and the extrusion lubricant, friction pressure and blank debate between the Central Bureau of the tensile parts may be ripped. The air pressure side, BHF tension is very unstable.
The function of the tensile tendons can not be fully exploited
In a single press by using the air pressure side, side sections of bureau of BHF can not be adjusted, or with extremely laborious mold repair or die cushion adjust 9 double action drawing press the outer slide with four suspension points, can be thrown in mechanical or hydraulic adjustment method, adjusting die height or pressure points the preparation of the point blankholding force can be adjusted, conducive to the formation of.2. complex forming conditions of drawing die parts of the metal homogeneous flow, often in the border region with different pressure tensile reinforcement to control the metal flow resistance. Double action drawing press the outer slide, due to the pressure side rigidity, tensile ribs of metal completely deformed, thus give full play to the role of tensile reinforcement to control the metal flow. If the air pressure side, the local pressure section reach enough pressure
