Riser upper cover and manufacturing method thereof

Abstract

The invention discloses an integrally molded riser upper cover. A lower half part of a cover body is provided with a sleeve with a smaller diameter; the top of the sleeve is provided with an expanded annular pressing shoulder, and a cylinder body extends downwards from the bottom surface of the sleeve, and is provided with a downward through counter bore; and a screw head hole coaxially communicated with the counter bore passes through the cover body, and a splitting groove is formed on the cylinder body so as to form a compression part. The manufacturing method comprises the following steps of: A, preparing metal bars in preset shapes and with preset weight; B, cold forging the counter hole in the center of the bottom surface of each bar; C, continuously cold forging to gradually mold the diameter and depth of the counter bore so as to form the downwards through cylinder body, and cold forging the compression part in turn on the cylinder body; D, shaping the counter bore and the compression part, forming a necking auxiliary hole concavely on the top of the counter bore, and molding the sleeve and the annular pressing shoulder; and E, cold forging the screw head hole which covers the auxiliary hole and coaxially passes through to the counter hole on the top of the cover body. The invention has the characteristics of high precision, mechanical properties and assembly strength, and low production cost.

Description

technical field [0001] The invention relates to the field of a standpipe top cover, and more specifically relates to a standpipe top cover that meets high precision requirements and can reduce production costs and improve assembly strength and a manufacturing method thereof. Background technique [0002] The bicycle vertical tube beam hole must be assembled on the front fork vertical tube through a vertical tube upper cover, such as figure 1 As shown, the traditional standpipe upper cover 91 must be used with the coupling element 93; the standpipe upper cover 91 has a sleeve column 91a that can be matched with the top edge of the standpipe bundle hole, and a ring shoulder 91b that can be pressed against the top of the standpipe , a screw head hole 91c that runs through up and down; as for the coupling element 93, it is arranged in the front fork standpipe, and it is formed by layered welding of a tightening piece 93b on the outer periphery of a nut 93a. The sheet 93b is in ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for manufacturing the upper cover of the standpipe, so as to solve the problems in the prior art that there is waste material generation and the material density and strength of the upper cover of the standpipe cannot be further strengthened

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