In the die casting production, die casting machine, die casting alloy and die casting mold is the three elements. Die casting process is the three elements as an organic combination and to use the process. The process of liquid metal filling in die casting production is a process in which many contradictory factors are unified. Among the many factors that affect the filling, mainly the speed, pressure and time, etc., through the speed of control to reduce and eliminate the pressure chamber involved in the air, atomization cavity residual gas; through the pressure control, increase the product density Degree, reduce the formation of shrinkage; through time control, so that products should not produce defects and other defects. Using the calculation of process parameters to optimize the mold, die casting machine between the matching.
Therefore, only these process parameters for the correct selection, control and adjustment, so that a variety of process parameters to meet the needs of die casting production in order to ensure that other conditions in good condition, to produce qualified die casting. This article through the company's DCC280 horizontal cold chamber die casting machine produced by the pump shell products (with photos) as an example, a brief introduction to the production of the main process parameters of the calculation (Table 1 for the relevant parameters).
First, the speed parameters
(1) low speed
The plunger injects the aluminum liquid injected into the chamber smoothly into the inner gate position so that the process of filling the aluminum liquid completely into the chamber space between the plunger and the gate is the low speed process (typically 0.1 -0.3m / s). Set to pay attention to prevent the air involved, to prevent the liquid temperature drop, leading to premature solidification.
(2) high speed speed
The plunger presses the aluminum solution completely into the press chamber (typically 1.5-2.5 m / s). Before the aluminum liquid began to solidify, the liquid flow of aluminum is good, the pressure transmission is also good, so the shorter the filling time, the easier it is to get good quality castings.
(3) speed speed conversion trip
For aluminum and magnesium alloys, the switching point of each injection phase is particularly important, such as when the low speed into the high-speed, high-speed when the supercharger, etc., a direct impact on the product surface and internal quality.
Second, the pressure parameters
(1) casting pressure
Casting pressure is the main factor in obtaining the compact and contour of the castings, and the main features of die casting are different from other casting methods. Its size depends on the structure and power of die casting machine.
(2) up power
During the die casting process, the molten metal of the filling cavity transfers the specific pressure of the plunger to the force on the wall of the mold cavity.