Structure for preventing block-up of lower ejector core rod of casting core box and using method

Abstract

The invention discloses a structure for preventing block-up of a lower ejector core rod of a casting core box and a using method. The structure comprises a cold core box lower die, a lower ejector plate, an adjusting guide rod, a sand blocking sleeve and the lower ejector core rod, and guide rod holes are formed in the four corners of the cold core box lower die and the four corners of the lower ejector plate correspondingly; the adjusting guide rod is correspondingly matched with the cold core box lower die and the guide rod holes in the four corners of the lower ejector plate; the sand blocking sleeve is round, a sliding hole is formed in the centers of the sand blocking sleeve, the sand blocking sleeve is distributed on the upper portions of the guide rod holes of the lower ejector plate, and the sliding holes are matched with the adjusting guide rod; and the cold core box lower die is distributed above the lower ejector plate. The structure has the advantages of simple and reasonable structure, good quality of produced products and high production efficiency.

Description

technical field [0001] The invention relates to the field of casting, in particular to a structure and a use method for preventing a raised core rod of a lower core box of a foundry core box. Background technique [0002] At present, in the cold box mold of the foundry enterprise, the lower core rod on the cavity is leveled by the adjustment guide rods at the four corners of the lower top plate. For a few boxes, the lower ejector core rod was raised, causing pits in the sand core. In severe cases, the joint surface would be sandblasted. It has not been solved well. The disadvantages are as follows: when the lower top plate of the mold is jacked up, the loose sand on the lower top plate will fall from the hole of the adjustment guide rod to the flange below the adjustment guide rod, and the sand accumulated on the flange will raise the lower top plate. Cause the lower ejector core rod to be higher and the sand core to be sunken. Commonly used treatment methods: 1. Add a dus...

AI Technical Summary

Problems solved by technology

[0002] At present, in the cold box mold of the foundry enterprise, the lower core rod on the cavity is leveled by the adjustment guide rods at the four corners of the lower top plate. A few boxes, the lower mandrel was raised, resulting in pits in the sand core, and in severe cases, the joint surface will be sandblasted, which has not been solved well.

The disadvantages are as follows: when the lower top plate of the mold is jacked up, the loose sand on the lower top plate will fall from the hole of the adjustment guide rod to the flange below the adjustment guide rod, and the sand accumulated on the flange will raise the lower top plate. The lower ejector core rod is raised, and the sand core is sunken

Commonly used treatment methods: 1. Add a dust-proof rubber sleeve to the adjustment guide rod hole on the lower top plate. The friction between the rubber sleeve and the adjusting guide rod increases, the lower top plate is stuck, and the lower ejector rod is bent. In this way, it is difficult to handle on site, so the mold needs to be removed and repaired by professional maintenance personnel, which affects production

2. Shut down to clean and adjust the sand accumulation on the flange under the guide rod, which increases the workload of the operator and affects the production rhythm; 3. Manually use graphite paste to repair the flat sand core, which increases the workload of the core repairer; 4. The blank It is polished flat during cleaning, but there are also protruding and fleshy castings that affect the appearance of the casting. Some parts of the blank are protruding and fleshy, which is not easy to polish, which increases the cleaning workload and increases the production cost.

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