Inner core mold with contraction function

Abstract

The invention relates to an inner core mold with a contraction function. A main pin makes reciprocating linear movement along the axis of the main pin, and thus first guide rails and second guide rails on the side wall of the main pin drive first core mold bodies and second core mold bodies to make reciprocating linear movement in the radial direction of the main pin. During casting demolding, thecore mold bodies can be inwards contracted, smooth mold stripping can be achieved without arranging a pattern draft casting, and the problems that a deep cavity casting is excessively thick due to the pattern draft process problem, consequently the cooling speed is excessively low, and the processing allowance is large are solved; in addition, it can be guaranteed that the first core mold bodiesare inwards contracted more quickly than the second core mold bodies, and thus it is guaranteed that the first core mold bodies and the second core mold bodies are not mutually locked in the contraction process, so that the contraction process is smoother; and by enabling the included angle between the outer end faces of the side walls of the second core mold bodies and the radial direction of thecorresponding second guide rails to be 85-105 degrees, it can be guaranteed that the first core mold bodies and the second core mold bodies do not interfere during contraction, and the contraction function is achieved better.

Description

technical field [0001] The invention relates to the technical field of casting casting, in particular to an inner core mold with shrinkage function. Background technique [0002] In the casting process of industrial castings, the inner cavity of the casting is formed by a metal core mold, which has the advantages of high forming precision, fast cooling speed, and can be reused repeatedly. However, its biggest shortcoming is that the casting generally requires a draft angle of 3° to be successfully released from the mold, which also causes the problem that the thickness of the inner cavity of the casting is too large. In the specific calculation, when the depth of the inner cavity of the casting increases by 100mm, the thickness of the inner cavity must also increase by 5.25mm accordingly; Large and dense surface layers cannot be removed, which reduces the casting quality of castings. Contents of the invention [0003] Based on this, the object of the present invention is...

AI Technical Summary

Problems solved by technology

[0003] Based on this, the object of the present invention is to overcome the deficiencies of the prior art, and provide an inner mandrel with shrinkage function, which can shrink inwardly when the casting is demolded, and the casting can be released smoothly without setting a draft angle. The mold solves the problem of slow cooling rate and large machining allowance caused by too thick castings caused by deep cavity castings due to draft angle process problems

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