Molding machine troubleshooting

Molding machine roll out early, because of its novel and unique molding process and advantages of popular, and quickly replace the high pressure molding machine was very popular. But after the use of l0 years practice, people begin to find a single air impact molding machine exists many problems. By the end of the 1990 s, a single air impact moulding machine has almost no longer production, the use of air impact molding machine also be modified by new air impact moulding machine or replaced by the static pressure molding machine.

A single air impact molding machine mainly exist the following problems:

(1) gas rushed modelling mainly use compressed air to produce strong shock waves to achieve the purpose of tight sand. The shock wave noise is very big, big air impact molding machine shocks can reach more than 95 db noise). At the same time it also bears the template and sand, sand box and the auxiliary frame, auxiliary box pressure head between city and not too easy to solve the sealing problems. If the seal problem not timely solve, will appear the following situations:

A) sand from the damaged seal, weeks surrounding environment, even hurt.

B) on the sand flow, under the scour of sand box and the auxiliary frame is damaged, often need to repair or replacement.

C) along the sand box, the compactness of sand mould around the parting surface is reduced, and the defect in the sand box, cause when pouring molten iron to run fire, cast defects such as misrun, deformation, heaving sand.

(2) if the template layout is undeserved, will between appearance and sand box, high look at the phenomenon of "bridge" (or the arch effect, as shown in figure 2-3 place 49), make the sand mould deep concave (that is, the "bridge" below) and close to the sand box at the bottom of the sand mould low compactness, casting defects increase. To avoid the phenomenon of "bridge", can only increase the appearance and the amount I sand sand box wall l1, increase the high shape between the arrangement of the people ", the utilization rate of the template is reduced, equipment production capacity.

(3) because of the sand mold on the back of the sand compaction degree is low, should not be made high shape of sand mold.

(4) blow over moulding process of molding sand is more, the waste caused by sand.

(5) under the strong shock wave cycle impact molding machine frame welding clock and plate is easy to achieve fatigue and cracking, has become a common problem of air impact molding machine, it is also limited gas rushed modelling an important cause of development.