Appearance inspection: There are stripes on the surface of the casting that are consistent with the flow direction of the metal liquid, and there are obvious non-directional lines that are different from the color of the metal substrate, and there is no development trend.
The causes of flow marks are as follows:
1) The mold temperature is too low
2) Poor design of the runner and poor gate position
3) Low material temperature
4) Low filling speed and short filling time
5) Unreasonable pouring system 6) Poor exhaust
7) Unreasonable spray pattern The reason is that the paint in the cavity is sprayed too much or the paint quality is poor,
The solution and prevention methods are as follows:
1) Adjust the cross-sectional area or position of the inner runner
2) Increase the mold temperature
3) Adjust the speed and pressure of the inner runner
4) Appropriate selection of paint and adjustment of dosage