车床四爪卡盘是批量大形状较复杂且加工精度要求高的铸件(见图1),其凹进部分深与宽之比在1．7~3．9之间,过去我厂在271造型机型板生产时都是采用型芯,生产效率较低,成本高。为此,准对关键经过努力在271造型机上搞出了顶板漏模及顶杆继开器,解决了上述问题,经过生产验证是行之有效的,现介绍如下。一、漏模原理 Lathe four-jaw chuck is a large batch of more complex shape and high precision machining of castings (see Figure 1), the depth of the recessed part of the width ratio of 1.7 to 3.9, in the past I plant in 271 shape Model board production is the use of core, lower productivity, high cost. To this end, the quasi-critical efforts to come up with a 271 molding machine roof leak-proof and ejector relay, to solve the above problems, after production verification is effective, are presented below. First, the leakage principle