Abrasive flow polishing tool of internal threads of nut

Abstract

The invention discloses an abrasive flow polishing tool of internal threads of a nut. The abrasive flow polishing tool comprises an upper locating block, a lower locating block and a mandril, wherein the outer diameter of the mandril is smaller than the inner diameter of the nut; the axial dimension of the mandril is greater than that of the nut; step circular grooves matched with the nut and the mandril in dimension after concentric nesting are formed in splicing end faces of the upper locating block and the lower locating block; an abrasive material guide hole penetrating from the opposite side of the splicing end face to the step circular groove is formed in the upper locating block; an abrasive material guide hole penetrating from the opposite side of the splicing end face to the step circular groove is formed in the lower locating block; the mandril is concentrically nested in the nut and then located and mounted in the step circular grooves of the upper locating block and the lower locating block; the splicing end faces of the upper locating block and the lower locating block are opposite and compressed tightly; an abrasive material flows from the abrasive material guide hole of the upper locating block to an annular space between the nut and the mandril and flows out from the abrasive material guide hole of the lower locating block; and the tool improves a polishing effect of the internal threads and reduces surface roughness of the internal threads.

Description

technical field [0001] The invention relates to the technical field of abrasive flow polishing of narrow and complex cavities, in particular to an abrasive flow polishing tool for internal threads of nuts. Background technique [0002] The length of the trapezoidal internal thread of the nut of the engine transmission mechanism is 22mm, and the surface roughness requirement is Ra1.6. The thread precision is high and the surface quality is strict. After thread turning, there are burrs and knife marks on the surface of the tooth profile. Only large-sized burrs can be removed by hand, and the tooth profile cannot be polished. The traditional technology of abrasive flow polishing usually uses tooling to clamp the product, regards the threaded hole as a cavity, and establishes guiding channels for abrasives at both ends of the cavity, and the entire threaded hole is the circulation channel for abrasives. However, this type of tooling is only suitable for flat surface polishing....

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention provides a nut internal thread abrasive flow polishing tool, which can be used for thread profile abrasive flow polishing of threaded parts, and by adopting a better tooling structure, an abrasive flow channel for complex cavities can be established , to solve the problem of thread surface abrasive flow polishing

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