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首页> 外文会议>ICO20: Optical Devices and Instruments >A novel CNC aspheric grinding machine
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A novel CNC aspheric grinding machine

机译：新型数控非球面磨床

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Aspheric surface can be thought as being enveloped by a series of spherical surfaces with their centres on the same axis but having different positions. These spherical surfaces are tangent with the aspheric surface. We have manufactured a Φ600 CNC aspheric grinding machine with this novel operating principle. We choose δ_p , ε and α_p as the key parameters of our grinding machine. δ_p is the distance between the cup-shaped tools' bottom and the vertex of the aspheric surface. α_p is the rotational angle of the cup-shaped tool, ε is the space angle of the cup-shaped tool during the fabrication process of convex aspheric surface. Using this grinding machine, we can fabricate a conic concave aspheric surface continuously about three hours. But we need change the cup-shaped tool one time when we fabricate a conic convex aspheric surface in also about three hours. Our grinding machine can also be used to fabricate high-order aspheric surface. We used this machine fabricating a RC telescope system's primary and the secondary mirror. The PV-value is less than 5 μm for the primary Φ350 concave hyperbolic aspheric surface which departure is about 55 μm. We can polish and finish this aspheric surface with these residual errors easily. The manufacturing cost of the machine is about 300,000 RMB which is 1/10 of the LOH's product with the same maximum aperture of workpiece.
机译：可以认为非球面被一系列球面所包围，它们的中心在同一轴上，但位置不同。这些球面与非球面相切。我们以这种新颖的工作原理制造了Φ600CNC非球面磨床。我们选择δ_p，ε和α_p作为我们磨床的关键参数。 δ_p是杯形工具的底部与非球面顶点之间的距离。 α_p是杯形工具的旋转角度，ε是凸形非球面制造过程中杯形工具的空间角。使用该研磨机，我们可以连续制造大约三个小时的圆锥形非球面凹面。但是，在大约三个小时内制造圆锥形凸非球面时，我们需要一次更换杯形工具。我们的研磨机还可用于制造高阶非球面。我们用这台机器制造了RC望远镜系统的主镜和副镜。对于主Φ350凹双曲线非球面表面，PV值小于5μm，其偏差约为55μm。我们可以轻松地抛光和精加工带有这些残留误差的非球面。机器的制造成本约为30万元人民币，是LOH产品的1/10，具有相同的最大工件孔径。

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