Fixture for thin-walled workpiece

Abstract

The invention discloses a fixture for a thin-walled workpiece. The fixture includes two clamping devices. Each of the two clamping devices further includes a metal carrier and a damper. The metal carrier further includes a carrying portion having a carrying surface and a supporting portion located on the carrying portion. The supporting portion has a stair portion at a top thereof further having aplane surface and a standing surface with a slope. The damper further includes a clamping portion and a damping portion. The clamping portion has an end formed as an inclined surface with another slope identical to the slope of the standing surface. The damping portion has at least two elastic layers and at least one metal layer laminated in an interlacing arrangement and having the same slope asthe inclined surface. One of the at least two elastic layers is connected with the inclined surface of the metal clamping portion, and the other elastic layer is arranged on the supporting portion.

Description

technical field [0001] The invention relates to a workpiece fixture, in particular to a thin workpiece fixture with a multi-dimensional mode damping slope to achieve vibration damping effect in each mode, which can reduce the vibration of the workpiece during cutting and perform it in a steady state. Background technique [0002] For the cutting and manufacturing process of thin workpieces, such as aerospace thin-walled blades, simple fixtures are generally used or only screwed to the bed for processing. see Figure 6 As shown, the existing clamping device 90 is respectively clamped on opposite sides of a workpiece 20. The clamping device 90 is composed of a base 92 and a cover plate 91. Both the base 92 and the cover plate 91 are made of metal materials. After both sides of the workpiece 20 are pressed and milled, the workpiece 20 will be formed as Figure 6 Thin parts shown in dotted lines. [0003] During the milling process of the embryo and the embryo, the amount of ma...

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Problems solved by technology

[0003] During the milling process of the embryo and the embryo, the amount of material removed is large, the processing efficiency is high, and it is easy to cause a large vibration, especially when the workpiece is cut and thinner, the rigidity becomes lower, and it is easy to vibrate or chatter. The cutting steady-state area will become smaller and smaller, and the choice of steady-state processing parameters will be limited, resulting in poor processing efficiency

Therefore, the workpiece needs to reduce the vibration during the machining process and process it in a steady state to avoid excessive vibration during cutting, which may cause poor precision or damage to the workpiece and cause yield problems.

[0004] The vibration damping devices of the existing workpieces are all externally hung or leaned on the outside of the workpiece, and are composed of springs. The design disadvantage of this aspect is that it can only dampen vibration for a single interval frequency (single mode), but the nature of the thin-walled workpiece Frequencies and mode shapes have a variety of shapes, and the influence of other modes cannot be fully reduced

[0005] Secondly, the existing vibration damping fixture can only damp vibration in a single direction, and the vibration mode of the workpiece is a three-dimensional movement. The maximum shear stress surface must be found through stress analysis to reduce the vibration mode.

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