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在立式铣床上,加装一个普通的挂轮架,两个万向接头,一个伸缩轴,利用铣床原有的附件:圆工作台以及交换齿轮等,即可扩大铣床的功能——铣削特大半径的圆弧,并能达到较高的精度。我厂工具车间在制造冲压模具时,遇到如图1所示的拼镶件。由于圆弧半径很大,要精确地加工成形比较困难。常用的方法是用数控铣床或12米大型立车加工,但我厂无此设备。亦可用手工操作,即按划线铣削,但难度较大,且工件圆弧的精度和粗糙度都较差。这样加工出来的模具,难以达到凸凹模间隙均匀。我们经过反复试验,利用铣床原有的圆工作台配以上述附件,通过直线运动与转动的合成,较准确地近似铣出大半径圆弧面,精度和粗糙度均达到要求。现以图1所示之工件为例,叙述如下。
In the vertical milling machine, the installation of a common rack, two universal joints, a telescopic shaft, using the original milling machine annex: round table and the exchange of gears, etc., you can expand the milling machine function - Milling large Radius of the arc, and can achieve higher accuracy. I plant tool shop in the manufacture of stamping dies, encountered as shown in Figure 1 spell inserts. Due to the large radius of the arc, it is difficult to accurately shape the workpiece. Commonly used method is to use CNC milling machine or 12-meter large vertical lathe processing, but I plant no such equipment. Can also be used by hand, that is, according to crossed milling, but more difficult, and the workpiece arc accuracy and roughness are poor. This processed out of the mold, it is difficult to achieve punch and die gap uniform. After repeated experiments, we used the milling machine’s original round table to match the above attachments. Through the combination of linear motion and rotation, we can precisely approximate the large radius circular arc surface with precision and roughness meeting the requirements. Now the workpiece shown in Figure 1 as an example, described below.