When the mechanical pressure machine tool works, the motor drives the large pulley (usually also used as flywheel) through the V-belt, and drives the crank slider mechanism through the gear pair and the clutch, so that the slider and the punch go down in a straight line. After the forging work is completed, the slider returns upward, the clutch is automatically disengaged, and the automatic device on the crank shaft is connected to stop the slider near the top dead center. When the mechanical press works, the motor drives the large pulley (usually also used as flywheel) through the V-belt
Working principle of forging machine tool
The crank slider mechanism is driven by the gear pair and the clutch to make the slider and the punch go down in a straight line. After the forging work is completed, the slider returns upward, the clutch is automatically disengaged, and the automatic device on the crank shaft is connected to stop the slider near the top dead center.
The essence of roll forging deformation is the rolling extension of the billet. The section of the billet becomes smaller and the length increases. When the section deformation is large, it needs to be completed by several passes through multiple rolling. The process design is mainly to determine the reduction, expansion and extension deformation of each step of roll forging reasonably. They depend on the size of the roll diameter, the shape and size of the pass, the temperature of the blank, the cooling and lubrication and other deformation conditions. Some double support roll forging machines have a roll shaft protruding at one end. This is a composite roll forging machine combining cantilever type and double support type. It can realize both longitudinal roll forging and lateral widening forming at the cantilever end. In the mass roll forging production, the manipulator is widely used to transfer workpieces to realize the automation of the production process, improve the productivity and reduce the labor intensity.
A forging method in which a blank placed in a female die is pressurized by a male die to produce a plastic flow, thereby obtaining a workpiece corresponding to the shape of a die hole or a concave convex die. During extrusion, the billet generates three-dimensional compressive stress, and even the billet with low plasticity can be extruded. Extrusion, especially cold extrusion, has high material utilization rate, improved material structure and mechanical properties, simple operation and high productivity. It can make long rod, deep hole, thin wall and special section parts. It is an important cutting process. Extrusion is mainly used for metal forming, but also for non-metal forming such as plastic, rubber, graphite and clay blanks.
Each slider crank mechanism is called a "point". Z simple mechanical press adopts single point type, that is, there is only one crank slider mechanism. Some large working face mechanical presses adopt two-point or four-point mechanical presses to make the slider bottom face bear uniform force and move smoothly.
The load of the mechanical press is impulsive, that is, the forging time is very short in a working cycle. The short-time Z-POWER is more than ten times larger than the average power, so the flywheel is set in the transmission system. After the motor selected according to the average power is started, the flywheel operates to the rated speed and accumulates kinetic energy. After the punch contacts the blank and starts forging, the driving power of the motor is less than the load, the rotation speed decreases, and the flywheel releases the accumulated kinetic energy for compensation. After the forging work is completed, the flywheel accelerates again to accumulate kinetic energy for the next use.
Mechanical or electrical interlocking is set between the clutch and the brake on the mechanical press. The brake is released before the clutch is engaged, and the clutch is released before the brake is braked. The operation of the mechanical press is divided into continuous, single stroke and inching (inching), most of which are realized by controlling the clutch and brake. The stroke length of the slider is unchanged, but the distance between its bottom surface and the working surface (called sealing height) can be adjusted by the screw.
In production, it is possible to exceed the nominal working force of the press. For equipment, overload protection device is often installed on the press. For the personal safety of the operator, the press is equipped with a photoelectric or two hand operated personal protection device.