CN101829704A - Method for processing aluminum alloy composite pipe - Google Patents

Abstract

The invention discloses a method for preparing an aluminum alloy composite pipe, which comprises the following steps of: 1, extruding a fusion casting aluminum ingot to form a sleeve; 2, peeling the fusion casting aluminum ingot to form an internal core rod; 3, sleeving the internal core rod into the sleeve by adopting a hot interference method to form an extruded blank; 4, extruding the prepared extruded blank to form a composite blank pipe through a reverse extruder; and 5, drawing the prepared composite blank pipe to form the composite pipes of various specifications. The composite pipe is prepared by the processes of extruding the sleeve with large outside diameter, then peeling the outside diameter of the fusion casting ingot, sleeving the core rod into the sleeve by adopting the hot interference method to form the extruded blank, reversely extruding the extruded blank, drawing the composite blank pipe and the like. The preparation method has the advantages of low equipment investment, simple operation, easy control and uniform directional strength.

Description

A kind of processing method of aluminum alloy composite pipe

Technical field

The present invention relates to a kind of processing method of aluminium-alloy pipe, belong to the manufacture field of non-ferrous metal tubing.

Background technology

Ratio-frequency welded tube technology is adopted in the multiple tube preparation of aluminum current compo pipe mostly, equipment investment is big, at present common ratio-frequency welded tube equipment price is substantially millions of, add that production line of corollary equipment needs up to ten million, complex process comprises that composite blank is rolling, rolling, unreel, aligning, crop, cut weldering, super kink, deburring, plate becomes the plate body ultrasonic examination, moulding, the electric induction welding, weld seam supersonic detection, post-weld annealed, air cooling, water-cooled, sizing, flying shear, the water flushing, Pipe Cutting, flatten experiment, aligning, tack, hydrostatic test, coating, step such as tie up, and production joint place intensity a little less than.

Summary of the invention:

Technical problem to be solved by this invention is at above-mentioned the deficiencies in the prior art, and a kind of small investment is provided, aluminium alloy compound tube preparation method simple to operate.

Technical scheme of the present invention is:

A kind of preparation method of aluminum alloy composite pipe comprises the steps:

The first step is crushed to sleeve pipe with the founding aluminium ingot

In second step, internal core rod is made in the peeling of founding aluminium ingot;

The 3rd step, be inserted in plug after sleeve pipe added thermal expansion, the stress after shrinking by cooling is fixed pipe box and plug;

In the 4th step, the Compound Extrusion blank that makes oppositely is extruded into compound base pipe: concrete steps are for installing extrusion die, blank preheating, blank filling, extrusion modling;

The 5th goes on foot, and the compound base pipe that makes is drawn into the multiple tube of all size.

Beneficial effect: this multiple tube is by pushing big external diameter sleeve pipe, plug is inserted in sleeve pipe makes extrusion billet adopting heat to be full of method after the peeling of melting ingot casting external diameter then, oppositely push again, make after the operations such as drawing, can make the inside and outside different multiple tube of two-layer alloying component, this preparation method capital equipment is that a pipe box firing equipment, two extruders, one are pulled a cart, equipment investment is far below large-scale production line of high-frequency welded tube, main production stage is sleeve pipe, extruding, drawing, fairly simple, easily control, intensity each to evenly.

Description of drawings

Fig. 1 is a schematic flow sheet of the present invention.

The specific embodiment

The invention will be further described below in conjunction with accompanying drawing.

The first step, the melting bar is squeezed into sleeve pipe: concrete steps are that installation mold, bar are preheated to 500 ℃, bar filling, extrusion modling;

Second step, the founding aluminium ingot is carried out the external diameter railway carriage by engine lathe make internal core rod, the mean outside diameter of internal core rod must be greater than about sleeve pipe mean inside diameter 0.2mm

The 3rd step, will overlap effective net belt type resistance furnace or walk formula stove heating be expanded to 400 ℃ after, be inserted in plug, by the stress after the cooling contraction pipe box and plug are fixedly made compound bar billet;

The 4th step, the extrusion billet that makes is preheated to 460 ℃ after filling advance ingot-containing tube, the part of installation mold and mould is threaded a needle, push compound base pipe;

The 5th goes on foot, and the compound base pipe that makes is taken the lead fill in drawing mould, starts the multiple tube of pulling a cart to be drawn into all size.

This multiple tube is by pushing big external diameter sleeve pipe, make extrusion billet with adopting the method for expanding with heat and contract with cold that plug is inserted in sleeve pipe after the peeling of melting ingot casting external diameter then, oppositely push, making after the operations such as drawing.

Claims (1)

1. the processing method of an aluminum alloy composite pipe is characterized in that, comprises the steps:

The first step is crushed to sleeve pipe with the founding aluminium ingot;

In second step, internal core rod is made in the peeling of founding aluminium ingot;

In the 3rd step, be full of method by heat and internal core rod is inserted in sleeve pipe makes extrusion billet;

In the 4th step, the extrusion billet that makes is extruded into compound base pipe by indirect extrusion machine;

The 5th goes on foot, and the compound base pipe that makes is drawn into the multiple tube of all size.

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