Five-axis milling method for complex curved surfaces

Abstract

The invention provides a five-shaft milling method for a complex curved surface. The method selects a hard uncoated milling-cutter with 0.2-0.8 [mu]m ultrafine or microfine particulars, wherein the milling-cutter uses a conical or tapered-conical structure with a cutter teeth Z of 3-5 blades, a helix angle beta of the blades is more than or equal to 45 DEG, a length to diameter ratio of the cutter D / L is less than or equal to 15, climb milling is used, cutting action of the cutter pulls the cutter to cut, a cutting-in point and a cutting out point of a cutter path are arranged outside the curved surface, the cutter path is along an arc tangent direction when workpieces are cut in or cut out, directions of the cutter path are changed outside the curved surface, a distance of the cutter path away from the curved surface is not less than 1 to 4 times of a tool diameter D; during processing, a tool feed amount Fz is less than or equal to 0.11-0.5 mm, a cutting speed V is 17-260 m / min; during a rough machining and a fine finishining, different cutting depths are selected, the fine finishining need a reserved amount of 2-0.7 mm; and oil gas spray of compressed air is used to cool and lubricate.

Description

technical field [0001] The technical invention relates to a five-axis milling processing method for complex curved surfaces, in particular to a milling processing method for integral impeller system parts and complex curved surface parts in high-tech fields such as aviation and aerospace. Background technique [0002] With the increasing number of electronic devices on modern aircraft, the requirements for environmental control are getting higher and higher. The core components of turbomechanical refrigeration components, recirculation fans of components, cooling fans of electronic equipment, etc. all use high-speed rotating impeller machinery, impellers, etc. As a key component of these rotating machines, its overall processing quality not only affects the efficiency of the component, but also directly relates to the reliability of the component. The integral impeller of this type of structure can meet the product strength requirements of high thrust-to-weight ratio and high...

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Problems solved by technology

[0003] 1: Since the radius of the tool center is close to zero, the tool center does not produce milling, and a large extrusion phenomenon is easily generated during the milling process, so the cutting heat and cutting vibration cause the cutting tool to be easily damaged;

[0004] 2: Affected by large cutting force and cutting heat during the milling process, it will cause the deformation of the curved surface of the blade and the flow channel, thereby affecting the dynamic balance performance of the overall part. Interference occurs and parts are damaged;

[0005] 3: Over-cutting, under-cutting or even deep digging at the root of the impeller. The error of the root surface profile is relatively large, which is prone to serious tool vibration and causes the cutting tool to be easily damaged (blade collapse, tool breakage). Force and cutting vibration affect the milling efficiency and reduce the cutting efficiency, so the processing time is long

[0006] With the continuous development of science and technology, the requirements for product manufacturing efficiency, manufacturing quality stability and product performance are getting higher and higher. Therefore, the requirements for the shape, dimensional accuracy and surface quality of the blade curved surface and runner curved surface of the overall impeller system parts are also getting higher and higher. The higher the value, the traditional complex surface system part milling process cannot meet the production needs

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