Thu Apr 27 23:47:05 CST 2023
1，Confirmation of drawings and dimensional enlargement of aluminium alloy die castings to obtain a model of the casting for the mould design process. The die cavity and core dimensions obtained as a result of this design have taken shrinkage into account. There are several ways to set the shrinkage rate, which are flexible and in line with the actual situation. In order to ensure that the casting size requirements are met, the casting can be set at a certain shrinkage rate; it is also possible to select different shrinkage rates to set certain dimensions one by one according to the different shrinkage resistance of the casting; it is also possible to select a shrinkage rate for certain features on the casting that have a similar shrinkage rate to enlarge the casting model size.
2， Select the parting line and establish the parting surface: After the analysis of the display observation of the three-dimensional solid model of the part, the parting line is determined. Take the surface of one side of the parting line to establish the parting surface. The process is not cast out of the hole, the need to draw the core of the hole, first do broken hole repair politics, if these holes are not pre-processed, demoulding may often occur due to the hole caused by interference and can not be separated from the mould. For the holes that need to be touched by the moving and fixed moulds, repair is done at this time according to their later parting surface. Using duplication techniques, all surfaces of the part on one side of the parting line are duplicated, i.e. the surface of the cavity on that side, and then the parting line is extended parallel to the outer side of the embryo all around.
3，Demoulding: Using the established parting surface, the blank is divided into two pieces, and then the parts are split from the one with the parts, at which point the dynamic and fixed mould cores with cavities are formed, i.e. the main design work for the dynamic and fixed mould cores is completed.
4，Pouring system, slag bag design: can be established in advance or step by step pouring system, slag bag database, design can be called, only some size modification.
5， determine the aluminum alloy die casting benchmark, core benchmark, die frame benchmark: in the modern CNC machining technology equipment with precise positioning conditions, in the casting selected a benchmark, such as product design or for assembly benchmark, the core and die frame can be selected for the centre of its parting surface as the benchmark. The use of datum points, casting model, core and mould frame according to its benchmark each in its place, making the mould design process clear and simple, easy to check, not easy to make mistakes. The hole positions of the top bar, reset bar and core are marked with the coordinate method, and the hole positions can be precisely determined by drilling with a machining centre.
6， In the parting surface, consider the impact of the parting surface on the moulding dimensions and make corrections.
7， Model inspection:
①Drawing angle inspection: After specifying the direction of drawing (including core extraction), the area of different drawing angles shows different colours, which is intuitive and easy to distinguish, and can also check whether there is an inverted cone.
②Aluminium alloy die casting thickness check: set the thickness to determine the thickness distribution of the casting section, and can also take countermeasures if the thickness is too thick or too thin.
③Clamping force check: find out the projected area of the casting in the specified direction and make a final check of the clamping force and core clamping force.
④ Simulation of the die casting process, pouring and opening the mould for inspection.