CN104043673A - Preparation method of hot dip galvanized steel tube/titanium bimetal composite tube - Google Patents
Preparation method of hot dip galvanized steel tube/titanium bimetal composite tube Download PDFInfo
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- CN104043673A CN104043673A CN201410272354.1A CN201410272354A CN104043673A CN 104043673 A CN104043673 A CN 104043673A CN 201410272354 A CN201410272354 A CN 201410272354A CN 104043673 A CN104043673 A CN 104043673A
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Abstract
The invention provides a preparation method of a hot dip galvanized steel tube/titanium bimetal composite tube, belonging to the technical field of bimetal composite tube preparation. The preparation method is characterized by firstly sleeving two metal tubes subjected to deoiling, acid pickling and polishing with a wire brush together, secondly inserting a core rod into the inner tube, carrying out plastic processing on the two metal tubes once or multiple times, thirdly carrying out finishing and drawing treatment, and finally washing the inner and outer surfaces and cutting the head and the tail, thus obtaining a finished product of the composite tube, wherein the total wall thickness reduction rate during plastic processing is 20-80%; the wall thickness reduction rate of the final pass is 10%; the feeding angle of a plastic processing hammer head is 90 degrees; the discharge speed is 1-5m/min. The method has the advantages that not only can the bimetal composite tube with high bonding strength be obtained but also the equipment is simple, the production flexibility is high and the cost is low.
Description
Technical field:
The present invention relates to a kind of production and processing method of pipe, particularly relate to a kind of production and processing method of metal composite pipe.
Technical background:
Along with industry developments such as Aero-Space, ocean engineering, electricity power, petrochemical industries, homogenous material is more and more difficult to meet actual instructions for use in performance, by two or more Material claddings with different performance together, the composite that significantly improves Integrated using performance comes into one's own day by day.Utilize metal composite technology production stratiform multiple tube, make this composite pipe have the advantage that two (many) plant metal concurrently; Also can adjust the thermal conductivity of this composite pipe shell by design thickness rate, intensity, electrical conductivity, the performance indications such as thermal coefficient of expansion are to meet application requirements; And can guarantee that multiple tube has high air-tightness.Owing to having the not available combination property of single metal tube, multiple tube is widely used in pipe, the heating furnace for conveying in the fields such as oil, chemical industry, nuclear industry, medicine equipment, food processing, refrigerating industry with managing and pipe for apparatus.Wherein, typical case's one class bimetallic tubing is that a kind of metal meets requirement of strength or possesses excellent heat conductivity performance, another kind of metal has good anticorrosive or abrasion resistance properties, make like this bimetallic tubing not only there is desired high strength, high heat conductance, but also there is good anticorrosion, the performance such as wear-resistant.
The production technology of composite bimetal pipe mainly contains the hot-working composite algorithms such as the cold working composite algorithms such as drawing, roll extrusion, spinning, hydraulic expanding-forming, vacuumizing method and hot extrusion, thermal diffusion welding, centrifugal casting, but all there is the problems such as complex process, equipment investment is large, energy consumption is high in hot-working composite algorithm, and at high temperature the retention time is longer, interface easily produces compound between brittle metal, affects the serviceability of bimetal tube.
Summary of the invention:
The problem existing in order to solve above-mentioned technique, the present invention proposes and utilize complex technique to obtain the composite billet being integrated by metallurgical binding, again through the process of plastic working (as plastic working, drawing etc.)-annealing work hardening and the residual stress of composite wood (eliminate)-spark machined.Technique is to bimetal tube to adopt plastic working to turn forging (being called for short " plastic working "), and the method can not only obtain the composite bimetal pipe that bond strength is high, and equipment is simple, production flexibility is large, cost is low.
In order to achieve the above object, technical scheme of the present invention is: first two kinds of metal tubes after surface treatment are nested together, then in inner tube, insert plug, adopt plastic working bimetal tube to be carried out to the plastic working processing of one or many.Plastic working processing have technique simple, save material, the advantage such as with low cost, be applicable to multiple material processing, be a kind of method of economy, Quick-forming axle class and pipe part.Small size in plastic processing deformation process (small deformation district) repeatedly forges the three-dimensional compressive stress distortion of generation, be conducive to realize large pass deformation (much larger than the pass deformation of drawing and hydraulic expanding-forming), be conducive to produce the multiple tube that bond strength is high.
Concrete steps of the present invention are as follows:
Step 1: pre-treatment.The inner surface of clad metal pipe is carried out to oil removing cleaning, pickling and wire brush polishing; Metal mandrel is carried out to alignment.If surface is cleaner and oxide is less after oil removing, can save the step that oxide-film is removed in pickling, directly carry out wire brush polishing, polishing be take and exposed fresh metallic matrix as standard;
Step 2: sleeve combination.Inner tube is packed in outer tube, the two gap (be called shell clearance, refer to outer tube diameter and inner tube external diameter difference 1/2nd) between 0.1mm～1.0mm, (under the prerequisite that can assemble smoothly, reducing the gap of two pipes) as far as possible; After mandrel outer is evenly coated lubricating oil, insert in inner tube, the gap of plug and inner tube is between 0.1mm～1.0mm.The diameter that the wall ratio of outer tube and inner tube can be determined the bare terminal end of plug according to actual user demand is greater than the diameter of its workspace, also be greater than the internal diameter of outer pipe, thereby the feeding while being conducive to plastic working, and tubing can not extend and be pressed into the bare terminal end of plug because of distortion, thereby has avoided plug cannot deviate from the generation of situation;
Step 3: plastic working is compound.Oxidized for preventing the fresh metal that step 1 polish, should after polishing, carry out as early as possible temperature-room type plasticity processing processing, during plastic working, total wall thickness reduction is between 20%～80%, rolling pass can be 1～6 passage as required, the wall thickness reduction of last passage is in 10% left and right, be conducive to improve surface quality, plastic working tup angle of feed is 90 °, and discharging speed can be between 1～5m/min;
Step 4: finishing is processed.Tube surfaces after plastic working can produce many rough hammerings, can apply 1 drawing of gage variation during a pass reduction between 5%～25%, improves dimensional accuracy and the surface quality of tubing.Finally by inside and outside surface clean, cutting head cutting tail, obtains multiple tube finished product.；
Step 5: spark machined becomes the metal composite pipe of multiple special-shaped cross-section.
The invention has the advantages that:
1, manufacturing process of the present invention utilizes the feature that plastic working small deformation district repeatedly forges, is out of shape under three-dimensional compressive stress state, can realize large pass deformation, can process the metal of multiple difficult distortion, and circumferentially evenly compression, can not form breach and crackle because being out of shape the inhomogeneous material that causes, the multiple tube bond strength of producing is higher than additive methods such as drawing and expand tubes.
2, the required deformation force of shaping of the present invention is little, and instrument, die life are high, and the required driving force of equipment is little, adopts low power motor just can realize shaping, and operating cost is low.
3, the present invention produces flexibly, technique is simple, do not need expand tube in advance compound, only need sleeve pipe just can directly carry out plastic working shaping, and the size of changing according to the actual requirements plug, forging hammer just can be produced the composite bimetal pipe of different size, various combination.
4, the diameter of plug bare terminal end of the present invention is greater than the diameter of its workspace, also be greater than the internal diameter of outer pipe, thereby can bring in feeding with clamping, and tubing can not extend the bare terminal end be pressed into plug because of distortion, avoid plug cannot deviate from the generation of situation.
The specific embodiment:
Below in conjunction with embodiment, technical scheme of the present invention is described further.
Produce pure hot galvanized steel pipe/titanium composite bimetal pipe.
(1) pre-treatment: hot galvanized steel pipe pipe specification is Φ 12.2 * 2mm, titanium pipe specification is Φ 8 * 0.6mm, shell clearance is 0.1mm, diameter of mandrel is Φ 6.6mm (material is mould steel), with 5%NaOH solution, hot galvanized steel pipe pipe and titanium pipe are carried out to oil removing, the effective 10%HCl solution of hot galvanized steel pipe carries out pickling, the effective 25%HNO of titanium
3+ 5%HF solution carries out pickling, then with wire brush, the outer surface of the inner surface of hot galvanized steel pipe pipe and titanium pipe is polished to fresh metallic matrix.
(2) sleeve combination: the titanium pipe of having polished is inserted in hot galvanized steel pipe pipe, and mandrel outer inserts in titanium pipe after evenly coating lubricating oil.
(3) plastic working is compound: two pipes that assemble are processed 1 passage through temperature-room type plasticity, obtain being of a size of the multiple tube of Φ 10.3 * 1.8mm, total wall thickness reduction is 30.8%, and total section shrinkage rate (pressing the front ectonexine metal tube cross-sectional area sum of distortion calculates divided by the front ectonexine metal tube cross-sectional area sum of distortion with the difference of the rear multiple tube cross-sectional area of distortion) is 38.4%.
(4) finishing and post processing: through a time drawing, cut head and afterbody, obtain the composite bimetal pipe that is of a size of Φ 9.8 * 1.7mm.Multiple tube interface is smooth and fit tightly, and shear strength is 5.9MPa, and after 20% enlarging, bilayer still fits tightly and cylindrical crack-free phenomenon, intact after flaring test;
Step 5: spark machined becomes the metal composite pipe of multiple special-shaped cross-section.
Claims (1)
1. the preparation method of pure hot galvanized steel pipe/titanium composite bimetal pipe, it is characterized in that first two kinds of metal tubes after surface treatment being nested together, then in inner tube, insert plug, adopt plastic working bimetal tube to be carried out to the plastic working processing of one or many, concrete steps are as follows:
(1) pre-treatment: hot galvanized steel pipe pipe specification is Φ 12.2 * 2mm, titanium pipe specification is Φ 8 * 0.6mm, shell clearance is 0.1mm, diameter of mandrel is Φ 6.6mm (material is mould steel), with 5%NaOH solution, hot galvanized steel pipe pipe and titanium pipe are carried out to oil removing, the effective 10%HCl solution of hot galvanized steel pipe carries out pickling, the effective 25%HNO of titanium
3+ 5%HF solution carries out pickling, then with wire brush, the outer surface of the inner surface of hot galvanized steel pipe pipe and titanium pipe is polished to fresh metallic matrix.
(2) sleeve combination: the titanium pipe of having polished is inserted in hot galvanized steel pipe pipe, and mandrel outer inserts in titanium pipe after evenly coating lubricating oil.
(3) plastic working is compound: two pipes that assemble are processed 1 passage through temperature-room type plasticity, obtain being of a size of the multiple tube of Φ 10.3 * 1.8mm, total wall thickness reduction is 30.8%, and total section shrinkage rate (pressing the front ectonexine metal tube cross-sectional area sum of distortion calculates divided by the front ectonexine metal tube cross-sectional area sum of distortion with the difference of the rear multiple tube cross-sectional area of distortion) is 38.4%.
(4) finishing and post processing: through a time drawing, cut head and afterbody, obtain the composite bimetal pipe that is of a size of Φ 9.8 * 1.7mm.Multiple tube interface is smooth and fit tightly, and shear strength is 5.9MPa, and after 20% enlarging, bilayer still fits tightly and cylindrical crack-free phenomenon, intact after flaring test;
Step 5: spark machined becomes the metal composite pipe of multiple special-shaped cross-section.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112223853A (en) * | 2020-09-14 | 2021-01-15 | 沈阳中钛装备制造有限公司 | Titanium steel composite pipe and manufacturing method thereof, electronic device and readable storage medium |
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| JPH1099922A (en) * | 1996-09-27 | 1998-04-21 | Nippon Light Metal Co Ltd | Tube reducing method for aluminum-based composite tube |
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| CN103878203A (en) * | 2014-03-20 | 2014-06-25 | 北京科技大学 | Preparation method of bimetal composite pipe |
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2014
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| US3774004A (en) * | 1971-12-10 | 1973-11-20 | Texas Instruments Inc | Tubing and method and apparatus for making |
| US4028785A (en) * | 1973-06-06 | 1977-06-14 | Yorkshire Imperial Metals Limited | Tubular products |
| JPH1099922A (en) * | 1996-09-27 | 1998-04-21 | Nippon Light Metal Co Ltd | Tube reducing method for aluminum-based composite tube |
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| CN101007386A (en) * | 2007-01-26 | 2007-08-01 | 中南大学 | Preparation and processing method of heterotypic dissimilar metals composite pipe shell |
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Cited By (1)
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|---|---|---|---|---|
| CN112223853A (en) * | 2020-09-14 | 2021-01-15 | 沈阳中钛装备制造有限公司 | Titanium steel composite pipe and manufacturing method thereof, electronic device and readable storage medium |
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Application publication date: 20140917 |