Machining method of butterfly-shaped composite material sandwich part

Abstract

The invention discloses a machining method of a butterfly-shaped composite material sandwich part. The butterfly-shaped composite material sandwich part is composed of an upper base plate, a lower base plate, an upper panel, a lower panel, a core material and a filling block; the above five-membered structure is positioned and fixed through appearance design and pin rods; the upper base plate, thelower base plate and a composite material process base plate are formed by milling a same composite material blank plate, numerical control datum holes and positioning holes are adopted for milling forming at the same time, the relative positions are accurate, and the secondary positioning and milling precision is high after part gluing is completed.

Description

technical field [0001] The invention relates to the field of manufacturing composite material parts, in particular to a processing method for butterfly-shaped composite material sandwich parts. Background technique [0002] The butterfly-shaped composite sandwich part is a typical complex-shaped assembly composed of multiple secondary parts. Widely used in mechanical performance testing, bearing characteristic analysis and other occasions. Since the test results have a great influence on the design of composite material products, there are extremely strict requirements on the position, internal quality, and external dimensions of its secondary parts. [0003] Each part of the butterfly-shaped composite material sandwich part is made of composite materials, consisting of a core layer in the middle, panels clamping the upper and lower surfaces of the core layer, and upper and lower backing plates on the outer layers of the upper and lower panels. The upper and lower backing p...

AI Technical Summary

Problems solved by technology

However, since the sunken area needs to completely expose the parts except the backing plate with openings on the surface, it is difficult to control the processing depth of the CNC machining method, and it is easy to damage the surface

The second traditional method is to apply for a long manufacturing cycle and high cost of forming molds with bosses in the center, which is less economical for small-batch products, and because the thermal expansion coefficients of composite materials and metal forming molds are different, the height of the metal bosses is the same as that of the backing plate. The step difference is unavoidable, and it is easy to cause secondary damage to the film surface of the product during demoulding, resulting in high manufacturing risks and high costs

This method also cannot solve the problem of consistent axis degrees of the opening positions of the upper and lower surface backing plates

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