Crack control mold core

The utility model discloses a crack control mold core, including the inner core, the week side cover of inner core is equipped with outer core, the leading line groove has been seted up on a surface of inner core, a surperficial threaded connection of inner core has the piece of piecing together, a fixed surface who pieces together the piece is connected with the core, the fixed surface that the inner core is located outer in -core portion is connected with the piston, a fixed surface of piston is connected with the inlet pipe, the week side cover of outer core is equipped with solid fixed ring, gu fixed ring's week side fixedly connected with buckle, the pressure release hole has been seted up to the bottom that just is located solid fixed ring to the side of the week of outer core, the internal surface in pressure release hole is provided with and seals the mouth, the interior fixed surface of outer core is connected with the fixed block, the utility model relates to a mould producergoods technical field. T