Qingdao bestech Operating process specification of the resin sand processing line

Operating process specification Qingdao bestech

1. Reclaimed sand preparation

According to the requirements of resin sand recycling equipment and process flow, to obtain the recycled sand meet the process requirements. Special attention should be paid to controlling the temperature of reclaimed sand entering the sand mixing machine, preferably at 25-35℃. Qingdao bestech

2. Adjust the amount of sand, resin and curing agent

(1) Flow measurement of sand mixer Qingdao bestech

According to the setting requirements of sand mixer, flow measurement should be carried out at least once every four days under normal production conditions. The flow rate of sand, resin and curing agent in the same time is weighed to master the time flow rate. First, the sand flow rate is adjusted according to the nominal flow rate of the sand mixer.

(2) Adjustment of resin quantity

Adjust the amount of resin added according to the sand flow, the amount of resin added is generally controlled in 0.8~1.2% of the weight of molding sand, the upper limit of thick large pieces, the lower limit of small and medium pieces.

(3) Adjustment of curing dose

The amount of curing agent added is normally related to the temperature of sand and workshop environment. Generally, it is controlled at 30~50% of the amount of resin added. The lower limit is taken at high temperature and the upper limit is taken at low temperature. The amount of bulk curing agent added for long sand releasing time is set as the lower limit to ensure that the resin sand has enough usable time.

(4) Adjustment and preparation of sand mixer

Daily maintenance of the equipment shall be carried out strictly according to the Operation Rules of the sand mixer, especially the blades and inner walls of the stirring cage shall be cleaned in time. Every day before sand release, the resin and curing agent pump should be circulated for 1~2 minutes alone, and pay attention to check whether the curing agent added to the hole has crystallization blockage phenomenon.