Turbine hollow blade rabbet processing locating clamping method and device

Abstract

The invention discloses a clamping method and a fixture of processing and locating of a turbine hollow blade tenon. In the selection of locating points, five optimum locating points are selected by adopting a fixture precision theory based on the differential geometry, a form closure rule of locating points with the help of a blade surface three-dimensional model and so when six points comprising a benchmark are used for location, the precision of blade location is the highest; in the selection of clamping points, weak links are avoided and auxiliary clamping points are chosen on a tenon top end and a blade mounting plate which are better in rigidity and bigger in size for reducing as much stress and deformation as possible to the hollow blade. On the basis, the invention designs a special fixture for processing the blade tenon, which consists of a fixture body, a location pin, auxiliary fixtures of the tenon top end and the blade mounting plate. The fixture can ensure the accurate location and effective clamping in the processing of the turbine hollow blade tenons, improve the efficiency in the manufacturing process of complex curved hollow blades, reduce the cost and eliminate the harm to human health.

Description

technical field [0001] The invention belongs to a machining and positioning method for turbine blades and a special fixture design, in particular to a positioning and clamping method and a fixture for machining the tenon of a hollow moving blade of a gas turbine turbine. Background technique [0002] A gas turbine is a rotary impeller power mechanical device that converts the heat energy generated by the combustion of gas or liquid fuel (such as natural gas, fuel oil) into mechanical work. It is widely used in energy, aviation, transportation, national defense and other fields. And the key major equipment for the development of aviation industry. The high-temperature turbine blade is the part with the highest temperature (above 1400°C), the most complex stress, and the harshest environment in the gas turbine. Its value accounts for nearly 50% of the whole product and is a key component in the gas turbine. The use of cooling blade structure is the most effective measure to i...

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Problems solved by technology

However, its disadvantages are also obvious. Because the low melting point alloy used is toxic to the human body, it will cause great damage to the health of the operating workers in the long run.

At the same time, the processing efficiency of low-temperature alloy containing box-shaped fixture is relatively low, the production cycle is relatively long, and the cost is very high, which restricts the large-scale processing and production of blades

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