The invention relates to a mold
assembly improved structure for greatly improving
casting precision of a light aluminum
piston. The mold
assembly improved structure is applied to
batch production of high-precision light aluminum pistons. The mold
assembly improved structure comprises an outer mold, a pin hole mold, a sliding block mold and a core mold. The core mold comprises a
piston core mold center piece. The
piston core mold center piece is composed of a rectangular
pyramid column and a supporting table connected with the rectangular
pyramid column. The mold assembly improved structure ischaracterized in that a through groove is formed in a supporting rail along the center line, a straight rod is arranged at the bottom of the pin hole mold, the straight rod and the through groove areequal in width, and the straight rod extends into the through groove; and a T-shaped guide rail groove is formed in the upper portion of the pin hole mold, a T-shaped guide rail is arranged on the upper portion of the interior of a cavity of the outer mold, and the T-shaped guide rail is sleeved with the T-shaped guide rail groove. The pin hole mold is provided with a pin column hole lower pressing block. The rectangular
pyramid column and the supporting table are connected in a fastened mode through a bolt with a tangential plane. An end face hole in the
tail end of the bolt communicates witha side hole of the bolt, and a rectangular pyramid column
deep hole is formed in the lower end face of the rectangular pyramid column. The mold assembly improved structure has the advantages that various abnormal abrasion of the pin hole mold is avoided, the bumping resistance is greatly improved, and the precision of the thickness of a radial
casting involved in the sliding block mold in production is improved.