A blade measuring fixture and measuring method

Abstract

The invention discloses a blade three-coordinate measuring fixture and a measuring method, comprising a base, a fixed top, a movable top seat, a column, a pressing block assembly and a handle. The pressing block assembly includes a pressing block, a cover plate, a guide groove plate, a guide plate, a pressing handle, and an angle locking handle. The pressing block assembly is arranged on the fixed top and can rotate around the fixed top; the movable top seat is arranged on the column and can move up and down along the column. The measurement method in the present invention adopts an iterative method to establish a coordinate system, only six characteristic points are needed to establish a coordinate system, and the method is simple. The measurement method realizes batch detection of blades and improves measurement efficiency. The present invention uses the central holes at both ends of the blade blank as the positioning reference, which improves the positioning accuracy. Due to the universality of the characteristics of the central hole on the end surface, the present invention is applicable to the measurement and positioning of various types of blades, and has strong versatility; the clamping angle of the blades can be adjusted , which is convenient for the three-coordinate stylus to step on the point.

Description

technical field [0001] The invention relates to the technical field of blade measurement, in particular to a blade three-coordinate measurement fixture and a measurement method. Background technique [0002] The blade is a part with many sizes, complex shapes and strict tolerance requirements. In the field of blades, three-coordinate measurement is generally used to ensure the quality of the whole process of blade processing and production. Because the three-coordinate measuring machine has strong versatility, good repeatability, and stability Strong, high detection accuracy and other advantages; three coordinates measurement needs to rely on the auxiliary fixture to fix the blade on the worktable and maintain the correct position, if the positioning accuracy of the auxiliary fixture is poor, it will affect the accuracy of the measurement results. [0003] The existing three-coordinate measurement generally uses a rectangular magnetic chuck to position the blade. This positi...

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Problems solved by technology

[0002] The blade is a part with many sizes, complex shapes and strict tolerance requirements. In the field of blades, three-coordinate measurement is generally used to ensure the quality of the whole process of blade processing and production. Because the three-coordinate measuring machine has strong versatility, good repeatability, and stability Strong, high detection accuracy and other advantages; three-coordinate measurement needs to rely on the auxiliary fixture to fix the blade on the worktable and maintain the correct position, if the positioning accuracy of the auxiliary fixture is poor, it will affect the accuracy of the measurement results

[0003] The existing three-coordinate measurement generally uses a rectangular magnetic chuck to position the blade. This positioning method is only suitable for the measurement of the finished product of the blade, and is not suitable for the measurement and positioning of the semi-finished product in the process of processing, because the positioning surface of the semi-finished product is made of blanks. On the other hand, the shape of each blank is not uniform, so it is difficult to ensure the precise uniformity of the blade clamping position during positioning, resulting in large errors, and continuous clamping is not possible. When facing mass production tasks, the three-coordinate repeatability cannot be used. Advantages, which greatly affect the production efficiency of the product

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