The development and problems of resin sand casting process
sand casting began in the 1950s, has now been for decades in
foundry industry, and its production technology and equipment has
been very mature and improved. Compared with the traditional clay
resin sand casting products has small surface roughness, high
dimensional accuracy, and good quality. Because it has been
increasingly favored by the market and developing rapidly, so it has
gradually become the mainstream products at the casting market.
Here to talk about the resin sand process issues:
1. the influence and control of sand temperature
on resin sand hardening
During the hardening process, furan resin sand's hardening reaction
rate is closely related to sand temperature, while it has an
important effect on the intensity of the mold after curing.
Therefore, we must control the sand temperature to meet the
production needs of the mold intensity.
2. the requirements to mold process for resin sand
Compared with the clay sand, the quality of resin sand casting
depends on the mold quality, so resin sand requires high quality of
the mold. The mold process to meet the needs of resin sand mainly
includes the following aspects:
A. Draft angle: with the use of resin sand molding, we should
increase the mold draft angle based on actual production to get good
B. the surface roughness of the mold: minimizing the mold surface
roughness is the important measure to obtain high-quality castings.
C. machining allowance: you can select a smaller machining allowance
which reduce the metal solution consumption and mechanical
processing costs to improve the dimensional accuracy of castings.
3 the impact and control of the added amount and
acid value of curing agent on mold
The added amount and acid value of curing agent directly affects the
hardening rate of resin sand. Too fast or too slow hardening rate of
resin sand casting will reduce the strength of the mold after
hardening, so it is necessary to control the rate.
Along with the market requirement for the appearance and quality of
improvement, the advantages of resin sand casting will increasingly
be taken seriously, and rapidly developed and very popular.