English Views: 472 Author: Site Editor Publish Time: 2021-08-26 Origin: Site
When the bucket teeth are poured, sand sticking sometimes occurs, so how to prevent the bucket teeth from sticking sand? In this passage, we will introduce to you some prevention measures. For excavator bucket manufacturers, we know more about it.
Why should we add new sand in time? Compared with cast iron, the pouring temperature of steel castings is higher, sometimes as high as 1560～1620℃. The main reason for the high pouring temperature is to prevent the cold isolation of the steel castings, but at the same time, this high temperature has a long heat effect on the sand mold. The scouring force of the mold is large. There is not much reclaimed sand in the core sand, because there are too many fine sand, dust, and iron sand in the reclaimed sand, resulting in low sintering temperature of the molding sand, and new sand should be added in time.
Because there are different types of buckets, such as excavator rock bucket, ditch cleaning bucket, excavator crusher bucket, etc., we should also pay attention to the compactness of the sand mold. The sand mold at the sticky sand shall not be compacted. Before pouring, we must inspect each sand mold to enhance and ensure the density and uniformity of the sand mold. For hard-to-compact parts and corners, we need to perform special compaction. The density of the sand mold should be high, which is generally at least 85. The uniformity should be good, and the gap between the sand particles should be reduced. Special attention should be paid to that the movement should be repaired in time after damage, and local looseness should not be caused by repair.
Pay attention to the setting of the pouring system and riser to avoid local overheating of the casting and mold. When designing the gating system, we should avoid direct punching of the die wall by the inner runner.
When pouring, appropriately reduce the pouring temperature, speed and height, which refers to reducing the impact and physical and chemical effects of the metal rod on the sand mold under the premise that the metal rod can be poured into the casting. To reduce the hydraulic, static pressure and thermal shock to the mold, we should pay attention to reducing the pouring height, upper mold height and the height of the sprue cup. For bucket tooth castings, although the wall thickness is not large, the pouring temperature is higher, which correspondingly prolongs the heat action time between the steel bar and the cavity surface. During pouring, the dynamic and static pressures of molten steel on the cavity are relatively large, creating conditions for mechanical penetration and sand sticking.
Apart from mastering prevention measures of bucket tooth sticking sand, choosing the proper bucket tooth is also important. There are many kinds of bucket teeth, such as Volvo excavator bucket teeth, mini digger ripper tooth, caterpillar excavator bucket teeth, etc. In order to have higher production efficiency, we should choose carefully.
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