Lining for small model machine blade

Abstract

The invention discloses a lining for a small model machine blade. The lining comprises a metal body. A large threaded hole is formed in the center of the metal body, three or more small threaded positioning holes are formed in the end face, the outer surface of the peripheral wall is conical, and multiple rings of grooves are distributed in peripheral wall. According to the blade manufactured by the lining, the fixing reliability of glass fiber cloth and the lining is high, delamination is not likely to happen, and the blade can bear the large centrifugal force; and a mold and the lining are positioned precisely, and offset of the blade in the mold is avoided.

Description

technical field [0001] The invention relates to a small sample model machine blade bushing. Background technique [0002] At present, most of the fan series products produced in our country use the developed model prototype, and then enlarge or reduce the size according to the principle of geometric similarity to produce fans of various machine numbers. Therefore, each new product needs to make a small sample model machine to verify the performance of the fan. Because the blades are small, the thickness of the glass cloth layer is relatively thin during the production process. It is necessary to ensure light weight, strength, and stiffness. Therefore, it is very important to make a small model machine blade, especially the production of the small model machine blade bushing at the blade root. [0003] Existing bushings such as figure 1 As shown, the tapered outer surface is flat. In order to increase the contact with the glass fiber cloth, the surface must be rough during...

AI Technical Summary

Problems solved by technology

[0003] Existing bushings such as figure 1 As shown, the tapered outer surface is flat. In order to increase the contact with the glass fiber cloth, the surface must be rough during processing, and sand blasting is required if necessary; at the same time, the bushing must be thoroughly cleaned when making blades. If there is oil stains, it will cause problems such as weak bonding between the glass cloth and the bushing, and easy delamination.

The bonding and fixing of the glass fiber cloth is completely guaranteed by the interference pressure of the mold, so it is necessary to increase the thickness of the glass fiber cloth at this position, which not only wastes materials, but also takes time and effort.

The positioning of the blades using this bushing can only be guaranteed by the size and limit of the mold processing. In order to install smoothly, there will be a gap between the mold and the bushing, so there will be inconsistency when the mold and the bushing are placed. ; and during the pressurization process of the mold, it may cause the blade to move up or down, not on the central axis of the blade

This kind of bushing can only use the air bag forming process to make blades, and the blade manufacturing method is single

In conclusion, existing bushings are not suitable for use with small model machine blades

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