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我厂以前生产的 CA15铝活塞毛坯,存在着凹裙表面有长条状凸痕,销孔座壁和裙端壁偏,工号座凸凹不平及外圆尺寸超差等质量缺陷。为了提高产品质量,满足用户要求,我们进行了技术攻关。一、产生质量缺陷的原因分析1.凹裙表面长条状凸痕浇注铝活塞时,我们采用气动起芯机起芯子,即在左、右边芯子靠气动起芯机平移撞动后,垂直起芯。由于气动冲击力大,所以当边芯子平移时,撞击了外模活塞型腔凹裙的凸出成型部分,使该处产生长条凹痕。于是,浇注后在活塞毛坯的裙部便形成了长条状凸痕(图1)。
The CA15 aluminum piston blank that our factory produced before, there is a long skirt on the surface of the concave skirt, the wall of the hole on the skirt and skirt on the wall, workbench unevenness and the outer dimensions of the ultra-poor quality defects. In order to improve product quality, meet user requirements, we conducted a technical tackle. First, the analysis of the causes of quality defects 1 concave skirt surface of the elongated slab pouring aluminum piston, we use pneumatic core machine from the core, that is, the left and right core by the pneumatic core machine translational movement, Vertical core. Due to the large pneumatic impact force, when the side core translates, it hits the protruding forming part of the concave skirt of the outer mold piston cavity to make a long dent. As a result, a strip of indentation is formed in the skirt of the piston blank after casting (Fig. 1).