Manufacturing method of sand core

• Main Authors: DENG HAO, CHEN LONG, ZHANG XIA, HUANG DANGHUAI, CHEN DAYUAN
• Format: Patent
• Language: Chinese; English
• Published: 12.11.2019
• Subjects: CASTING; FOUNDRY MOULDING; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING

The invention discloses a manufacturing method of a sand core. The manufacturing method comprises the step of (a) manufacturing a local sand core of an easy shrinkage area by adopting chromite coatedsand. Chromite has the characteristics of rapidity in heat conduction, high heat storage capacity and the like. According to the method, the sand core of the easy shrinkage area is manufactured by adopting chromite sand, the local sand core is obtained, and therefore, the shrinkage porosity around a bolt hole, which is made of the sand core, of a cylinder cover is avoided. Therefore, according tothe manufacturing method of the sand core, the shrinkage porosity around the bolt hole of the cylinder cover can be avoided, and the problem of the field at the present stage is solved. 本发明公开了一种砂芯制作方法，包括步骤a)：采用铬铁矿覆膜砂制作易缩松区域的局部砂芯。铬铁矿具备热传导快，蓄热能力强等特点，该方法采用铬铁矿砂来制作容易产生缩松部位的砂芯，并获得局部砂芯，故避免了该砂芯制作的汽缸盖的螺栓孔周围出现缩松。因此，本发明提出的砂芯制作方法，能够避免汽缸盖螺栓孔周围出现缩松，解决了现阶段该领域的难题。