Fan convex ring thin wall metal pipe, its processing method and special equipment

Abstract

Provided is a fan convex ring thin wall metal pipe, wherein the convex ring and the pipe fitting are connected together. The cross sectional shape is vertical angle sector or five-edge trapezium, wherein the convex ring edge line of the vertical angle sector near the connecting end is a vertical line and the opposite connecting end is the fan-shaped arc line, and that, the convex ring edge line of the five-edge trapezium near the connecting end is a vertical line and the opposite connecting end is the edgefold line. The processing method adopts the cart roll forming machine to shape the machining pipe fitting convex ring through the rolling method, namely using the internal mold core of the bobbin roller as the male die. The outside diameter of the internal mold core of the bobbin roller must be smaller than the inside diameter of the machining fittings. When the external mold core of the bobbin roller is used as the cavity die, the inside diameter of the external mold core of the bobbin roller must be larger than the outside diameter of the machining fitting convex ring. The processed fittings are put into the inner of the external mold core of the bobbin roller and the internal mold core of the bobbin roller is inserted to the processed fittings. The position of the male die and the cavity die convex ring are corresponding each other, wherein the male die and the cavity die rotate separately. At the same time, the male die applies force to the radial direction of the fittings shaped to the convex ring through rolling. The advantages of the invention are that: it has stable processing technology, simple operation, rigidly controlled quality of the processing fittings, and excellent rounding of the convex ring in favor of assemble, good tightness of the fittings, high pull strength.

Description

technical field [0001] The invention relates to a thin-walled metal pipe fitting and cold processing equipment, in particular to a thin-walled metal pipe with a fan-shaped convex ring and its forming method and special equipment. Background technique [0002] As we all know, thin-walled metal pipes have their own advantages and are widely used in industrial production, national defense construction, transportation, radio communications, medical and health, construction and living fields. The application of thin-walled metal pipes is expanding day by day. Mention the main topic. Utilizing the convex ring connection of thin-walled metal pipe fittings is an ideal method commonly used at present: it has the advantages of light and fast construction, safety and reliability, and easy disassembly and maintenance. However, most of the cross-sectional shapes of the convex rings of some metal thin-walled pipes are triangular and semicircular, and the defects in the forming method and...

AI Technical Summary

Problems solved by technology

However, most of the cross-sectional shapes of the convex rings of some metal thin-walled pipes are triangular and semicircular, and the defects in the forming method and equipment, the defects in the shape of the pipe fittings make the drawing strength of the pipe poor and the connection seal poor.

For example: Patent No. ZL 03225540.3 and ZL 200420021648.4, the shape of the convex ring of the thin-walled tube is triangular, and the convex ring is formed by three rollers, that is, the upper middle roller is a punch, and the lower two parallel rollers are used as a concave mold, so that the upper The force point of the roller pressing down is at the lowest point of the cam, the first to touch the pipe, and the middle bottom of the pipe is the middle of the parallel roller, which is a space, so that the rotation of the pipe is not at the center point during the convex ring forming process of the pipe The upper 360-degree rotation, but the bottom tube wall rotates radially and elliptically. The formed thin-walled tube and convex ring are not round. During use, the convex ring of the pipe fitting is often deformed and cannot be inserted into the connecting pipe fitting, which affects product quality.

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