hand feed punch

It was pointed out that,in order to guarantee the quality of manually made lost foam patterns,attentions should be paid to:(a)Density of the foam board should be more than 16 g / dm3;(b)Surface defects of lost foam patterns should be remedied in proper time.

详细介绍了消失模的手工加工成型方法和粘结剂的选用方法。

Electronic handwork skill training is very important and necessary for electronic information majors in higher vocational and technical college.

电子手工技能培训对于高职电子信息专业来说,是十分重要和必要的。