Shrouded impeller finish machining tool path planning method

A closed impeller and tool path technology, applied in electrical program control, digital control and other directions, can solve the problems of low machining accuracy, reduced product performance, low machining efficiency, etc., to improve product work efficiency, reduce tool deformation, and improve machining. The effect of precision

Active Publication Date: 2017-06-13
BEIJING POWER MACHINERY INST
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Problems solved by technology

The above methods have the following problems respectively: low processing efficiency, poor surface quality; low processing accuracy,

Method used

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  • Shrouded impeller finish machining tool path planning method
  • Shrouded impeller finish machining tool path planning method
  • Shrouded impeller finish machining tool path planning method

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Embodiment Construction

[0032] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0033] The invention provides a finishing tool track planning method for a closed impeller, comprising the following steps:

[0034] Step 1. Build a model

[0035] Obtain the three-dimensional digital model of the closed impeller, and define the blade pot surface as A, the blade back surface as B, the inner hub surface as H, the outer hub surface as S, and the leading edge surface as L with double 3 tensor product B-spline surfaces , the trailing edge surface is T, and the above characteristic surface constitutes a basic channel unit such as figure 1 Shown:

[0036] Define the direction from the leading edge to the trailing edge (streamline direction) of the above surface as the u-direction, and the direction from the inner hub to the outer hub as the v-direction, then take the vane surface A as an example, and use the double 3 tensor product B-spline su...

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Abstract

The invention discloses a shrouded impeller finish machining tool path planning method. The shrouded impeller finish machining tool path planning method comprises the following seven steps of model establishment, tool selection, machining area division, blade profile curved surface reconstruction, tool center point computation, tool shaft vector computation and post-processing. According to the shrouded impeller finish machining tool path planning method, obtained finish machining tool path can be in a streamline direction, so that the product machining efficiency can be improved; by means of small-angle five-axis plunge milling, deformation of tools caused by radial component force can be greatly reduced, and the blade machining precision can be enhanced; tool marks generated by tool feeding at both ends can be reduced.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing, in particular to a method for planning a finishing tool trajectory of a closed impeller. Background technique [0002] Closed impellers are widely used in aerospace engine compressors, turbines, turbo pumps and other components. The traditional process is welding or casting structure. With the development of technology, more and more closed impellers use integral CNC machining technology. This technology has become a key technology in the manufacture of aerospace engines, and the planning of finishing tool path is the core of the technology. The material of the closed impeller of the engine that is too difficult for aviation is usually a high-temperature alloy, titanium alloy or stainless steel, and the curved surface of the blade is a ruled surface or a free-form surface. repair, 5-axis milling of a single surface, 5-axis helical milling or contour milling that treats the chann...

Claims

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Application Information

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IPC IPC(8): G05B19/19
CPCG05B19/19
Inventor 孙晶罗远锋谷万龙宛春博邱文旺刘月萍
Owner BEIJING POWER MACHINERY INST
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