Upward ejection core rod with characteristic of easy replacement

Abstract

The present invention relates to an upward ejection core rod, particularly to an upward ejection core rod for a cold core box mold, wherein the upward ejection core rod has a characteristic of easy replacement. The upward ejection core rod comprises a rod body, wherein both sides of the rod body are processed with external threads, the left end of the rod body and a screw cap form a threaded connection, a string washer is arranged between the screw cap and the rod body, and the right end of the rod body and a nylon rod form a threaded connection. According to the upward ejection core rod, both ends of the upward ejection core rod are additionally provided with the screw cap and the nylon rod, the nylon rod is placed in a easy-wear position, and threaded connection fastening is adopted, such that a fault rate of the upward ejection core rod is substantially reduced, a service life of the core box is prolonged, replacement operation is simple after the nylon rod wears, and a time is saved; and the screw cap is adopted to arrange the upward ejection core rod on the upward ejection core plate so as to solve the problem of easy falling of the upward ejection core rod, such that core box damage caused by the upward ejection core rod due to easy falling can be effectively prevented, a service life of the mold can be prolonged, and core preparation efficiency can be effectively increased.

Description

technical field [0001] The invention relates to an upper ejector rod, in particular to an upper ejector rod for cold box moulds, which is easy to replace. Background technique [0002] In recent years, my country's sand core casting industry has been vigorously developed, especially in recent years, the rapid development of the sand mold casting industry has been promoted by the soaring prices of the automobile market. As the main equipment for core production, the cold box has a complex manufacturing process and a long production cycle. It is not only a vital part of the overall level of core-making technology and equipment, but also a basic guarantee for the realization of high-quality and efficient production of sand casting. The upper core rod of the existing cold box has problems such as easy wear and large gaps during use, resulting in large burrs on the sand core, which increases the workload of core repair and reduces the efficiency of core making, and some parts ar...

AI Technical Summary

Problems solved by technology

The upper core rod of the existing cold box has problems such as easy wear and large gaps during use, resulting in large burrs on the sand core, which increases the workload of core repair and reduces the efficiency of core making, and some parts are easy to leak. If the repair or repair is not clean, it will directly affect the molding and appearance quality of the casting. In addition, the upper mandrel is easy to fall off when it is used online, which will damage the core box and directly affect the quality of the casting and the service life of the mold. If the upper mandrel is replaced on site Core rods will delay production

Thirdly, possibly affected by equipment aging and staff maintenance, the upper mandrel is sometimes too high and sometimes too low, causing the sand core to sag or protrude, thus increasing the workload of core repairing and reducing the efficiency of core making

If missed repairs may lead to lack of meat or more meat in the casting, if it is in the cylinder, it will not be possible to polish and weld repair, resulting in a high scrap rate and affecting the economic benefits of the enterprise

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