Abstract: According to the special structure of the curved tail joint parts, an injection mold was designed. The outer shape of the plastic part was formed by two fitting side sliding blocks, and the inner shape formed by combinedtype dynamic and static inserts, and the plastic parts were pushed out by a pushing board. During mold opening, the side sliding blocks parting was realized by the inclined pillars, simultaneously the dynamic and static inserts were drawn out in the direction of mould opening. When the mould was closed, both sides of the slide dies were locked by a pair of special technical keys and locking wedge, and the burrs were effectively prevented, the quality of product was guaranteed. The drive system of side parting and corepulling mechanism simplified the mould structure, making the operation of the mold reliable.

Key words: curved tail joint, injection mold, side parting, technology key