Designing and preparing method for conversion-free preliminary processing reference integral sand core

Abstract

The invention relates to a designing and preparing method for a conversion-free preliminary processing reference integral sand core. According to the invention, preliminary processing references are designed in a processing reference plane, then the preliminary processing reference are integrated with sand cores where key workblank surfaces are located to form an integral sand core, so dimensional deviations between the workblank surfaces and machining surfaces are controlled to be in a small range. With the method provided by the invention, dimensional deviations between preliminary processing references, between the preliminary processing references and the workblank surfaces and between the workblank surfaces are reduced, so requirements on dimensional accuracy of a casting are met.

Description

technical field [0001] The invention relates to a sand core design and core-making method applied in the field of sand mold precision casting, in particular to a method for designing and making a core of an integral sand core without converting primary processing references. Background technique [0002] The design and core-making technology of the original foundry sand core are: casting design → primary processing benchmark design → casting process design → sand core and core assembly design → core box design → core box manufacturing → core box preparation → sand shooting (filling) Sand) → compaction → sand core curing → sand core ejection → sand core inspection → sand core repair → core making completed. [0003] This technology is poured after combining multiple sand cores, which mainly has the following deficiencies: 1) There are dimensional deviations between the primary processing references on different sand cores; 2) There are dimensions between the primary processin...

AI Technical Summary

Problems solved by technology

[0003] This technology is poured after combining multiple sand cores, which mainly has the following deficiencies: 1) There are dimensional deviations between the primary processing references on different sand cores; 2) There are dimensions between the primary processing references on different sand cores and the blank surface deviation; 3) There is a size deviation between the blank surfaces on different sand cores

These deficiencies will accumulate the deviation and transfer it to the casting, resulting in a large dimensional deviation between the blank surface of the casting and the initial machining reference, resulting in the over-tolerance of the dimension between the blank surface and the processed surface after the casting is processed.