The structure characteristics and functions of disc spiral ratchet were analyzed,and its injection mould structure was introduced,the demoulding at the fastener of molded plastic parts was realized by a simple ball rotating structure.A special grinding method was developed for the gear ring of the key part in the die,which reduced the processing cost.It has been verified by the actual production that the action of the mould parts was reliable,the molded plastic parts were qualified,and it had a certain reference for the mould design of similar plastic parts.
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