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[求助]
机械英文翻译一段求助！
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The aim of simulation of whirling process is to understand the surface generation process and worm geometry. The process of arriving at the worm profile for a given tool profile and set-up is explained below. Fig. 4 shows the set-up of machining of worm by whirling. Coordinate frames Sw (Ow, Xw, Yw, Zw) and St (Ot, Xt, Yt, Zt) are rigidly fixed to theworm and tool ring, respectively. The tool ring is set at an angle γ with respect to the transverse section of work and also set eccentric to the worm axis with an offset distance of C as shown in the Fig. 4. The tool traces a surface of an annular ring on its rotation. The determination of worm profile is done by considering a tool trace section parallel to Yt −Zt plane at a distance a as shown in Fig. 4 and the profile points (xta, yta, zta) in this section in tool co-ordinate frame St are obtained from tool profile points (xt, yt, zt) by Eq. (1): θ = sin−1 , xta = xt + a, yta = yt cos(θ), zta = zt (1) These profile points are transformed towork coordinate frame Sw and represented by (xwa, ywa, zwa). The transformed points are obtained by Eq. (2): The transformed profile coordinates are then moved helically to axial section of worm as given by Eq. (3) and are represented by (xw, yw, zw). This is the projected contour of particular tool trace section in axial section ofworm. The envelope of projected contour of many such tool trace sections in axial section ofworm at small intervals constitutes the worm profile. The envelope is constructed as a curve passing through extreme profile points from all the projected contours in both positive and negative Z-axis for every small interval in Y-axis. 上面是一段节选，希望能帮翻译一下，谢谢 |
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