Taking advantage of situation means that when designing runner, in addition to grasping control of liquid flow direction, it is also necessary to make full use of structural characteristics of parts to skillfully guide liquid flow to ideal filling state.
Specific instructions are as follows:
Material: ADC12
Average wall thickness: 2.87 mm
Weight: 553.6g
Filling time: 0.03 s
Vertical projected area: 25252.1(mm²)
Filling speed: 37 m/s

1. According to wall thickness sectional drawing, liquid aluminum rushing up from the bottom of surface a is a wall at b surface. Due to blocking of b surface, a larger part will be directed to periphery, along top of a surface filling. Remaining part goes down to d and e planes through c plane.
2. Since there are three waist-shaped holes on e-surface, it is equivalent to dividing e-surface into three parts, which need to be filled separately.

1. It can guide liquid flow upwards, try to allow fluid to stay on the top for as long as possible, and form an overall downward pressure in order to obtain the best effect of overflow discharge.
2. In order to use cavity wall to guide, direction of runner cannot point to the center of part, but must deviate from a certain angle so that refraction of fluid can achieve the best effect. That is, when fluid reaches cavity wall (such as inner side of a and b in wall thickness profile diagram), it is not refracted, but continues along cavity wall until it reaches the centrifugal point. If bottom of periphery is filled first, parting will be sealed and air will be trapped.

 

 

 

 

Sectional view of wall thickness

 

 

 

 

 

 

 

 

In fact, every successful case is result of making good use of situation. Because shapes of die-casting products are ever-changing and have different characteristics, they have different influences on flow direction and flow state of liquid. It must be clearly understood, coupled with a well-defined runner design, to make the best use of situation.
Premise of achieving a clear goal in runner design is that designer must clearly know what is direction and state of liquid flow into cavity? What shape will it pass through in the middle? What influence and change will they have on flow direction and state of liquid? What is flow direction and state of liquid in final stage? Where should meeting be located? All of these should be clearly conceived in designer's mind, otherwise, it is impossible to achieve without a clear goal, and simulation is only used to initially verify whether there is a large deviation in design.