CN85101434A - Manufacture of fin-tube - Google Patents
Manufacture of fin-tube Download PDFInfo
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- CN85101434A CN85101434A CN 85101434 CN85101434A CN85101434A CN 85101434 A CN85101434 A CN 85101434A CN 85101434 CN85101434 CN 85101434 CN 85101434 A CN85101434 A CN 85101434A CN 85101434 A CN85101434 A CN 85101434A
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- cold
- fin
- drawn
- hot rolling
- extended surface
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Abstract
A kind of method of producing extended surface tube, it is with the equipment of existing production typical circular seamless steel pipe---plug rolling unit and common cold-drawing device are produced extended surface tube.Its principal character is: behind perforation process, adopt 90 ° flat the rolling of not overturning, obtain the needed blank fin of finished product extended surface tube, again through Overheating Treatment, pickling, phosphatization behind the aided processes such as saponification, adopts the cold drawing die of particular design, on common cold-drawing device, carry out 3～5 passage cold-drawns, thereby obtain the shape and size of desired extended surface tube, on the roller-type straightening machine of interlaced arrangement, align then, last test package.
Description
Involved in the present invention is the manufacture method of extended surface tube, and extended surface tube is a kind of special-shaped seamless steel pipe that is used on high-pressure boiler and the various heat exchanger.
At present, the extended surface tube method for manufacturing is most typical to be represented as the hot extrusion method that West Germany Mannasman company is adopted, the technical process of this method is as follows: the scale base that breaks, the centering cavetto, bore hole or perforation, heat extrusion forming, pass through a time or the last moulding of two passage cold-drawns then, heat treatment after the moulding, aligning, inspection process are similar with other methods of making extended surface tubes, and there are some problems in this hot extrusion method, at first, need huge and complicated hydraulic test, so that required huge pushing force when heat extrusion forming is provided; Secondly, hollow forging must be at melten glass or is similarly heated in the lubricant, even there is glass to make lubricant, it is very big that the consumption of mould remains; The 3rd, the possibility of the steel pipe torsional deformation behind the heat extrusion forming is bigger.
Task of the present invention is exactly the problem that will solve above-mentioned existence, in the tubulation process, the present invention does not adopt heat extruder, and adopts the plug rolling unit of existing production typical circular seamless steel pipe, hot rolling goes out to have the hollow forging of blank fin, and after multi-pass cold-drawn moulding.So just save huge and complicated heat extruder, and and then overcome the problems referred to above of bringing therefrom.
The method according to this invention, it is basic identical that equipment that is adopted in the tubulation process and technology and common seamless circular steel pipe are adopted when making, its equipment is plug rolling unit and common cold-drawing device etc., but the straightener that need adopt the roller-type straightening machine of interlaced arrangement to replace the seamless circular steel pipe to use.Its technical process is: mill revises the disconnected base of chi, centering, and the annular furnace heating is at the enterprising eleven punch 11 of punch, tube rolling, take the lead, multi-pass cold-drawn moulding (all has heat treatment after per 1 to 2 passage, pickling, washing, phosphatization, aided processes such as saponification), align after the moulding and check.
For finishing the foregoing invention task, this method principal character is:
(1) adopt the hot rolling method to roll out the blank fin, hot rolling is that the flat of three passages or four-pass rolls
In the manufacturing of extended surface tube, generally adopt hot extrusion method at present, this method is taken the blank fin out of by hot extrusion molding on hollow forging, the present invention is then different, be to adopt the hot rolling method to roll out the blank fin on hollow forging, but it is different from the hot rolling of typical circular seamless steel pipe again, the latter will overturn when hot rolling 90 °, roll two passages, to guarantee good circularity and uniform wall thickness.Therefore, requiring roll gap when hole shape designs is 5 millimeter.Method of the present invention, then exactly in contrast.Do not overturn during hot rolling, just through three passages or four-pass is flat rolls, make the hollow forging after the hot rolling take two blank fins out of, this blank fin height and sectional area can satisfy the requirement of finished product extended surface tube fin height, and its fin height maximum can reach 11 millimeters.
Equal the hollow forging fin shape that shuts out, big or small and waste thickness of pipe wall is very big to cold-drawn shaping influence then, and therefore, the pass design is a critical problem in flat rolling.In general, the hollow forging fin is high more, sectional area is big more, extract qualified fin size when helping cold-drawn more because the restriction of capacity of equipment, we require the rolling hollow forging fin height that comes out more than 6 millimeters, its sectional area is greater than 2 times of finished product extended surface tube fin sectional areas, therefore be the shape and size that guarantee finished product extended surface tube fin, and consider the ability of hot-roll forming equipment, general selection tube rolling roll pass roll gap up and down is 18～25 millimeters.
When draw, the wall thickness of perforation hollow forging is thick more, helps reaching the fin height and the shape of qualified finished product extended surface tube more, and its wall thickness can be determined by following formula:
Perforation hollow billet wall thickness S 〉=(warp (millimeter) in finished product extended surface tube pitch (millimeter)-extended surface tube)/2+1.5(millimeter)
To consider above-mentioned requirements when correspondingly, pass designs.
In addition, the pipe diameter also is the problem that needs are considered, it can be by the specification of finished product extended surface tube, length, cold-drawn passage and equipment of hot rolling condition and determine.Should also be noted that, bite condition when boring a hole the hollow forging hot rolling for improving, pass the ratio of width to height should be greater than 1: 1, and its both sides radius of corner R should strengthen, and the latter also helps the degree of depth (the slick and sly concave surface degree of depth is generally below 2 millimeters) that reduces vertical slick and sly concave surface of hollow forging blank fin inwall after the hot rolling.
(2) control of multi-pass cold-drawn and cold drawing die size
When eliminating hot rolling, the slight concave surface that on waste inside pipe wall, stays and for guaranteeing the cold-drawn quality corresponding to fin, the cold-drawn passage is generally 3-5 time.The external mold of each passage cold-drawn all is designed to coniform.The design principle of its cold drawing die is: when former passage, at first compress the fin height, thereby launch above-mentioned concave surface, make its elimination.Near final pass the time, at first compress the fin width, then contact the hollow forging diameter, impel the fin cross directional stretch, with the geometry and the dimensional requirement of the fin that reaches the finished product extended surface tube.When final pass, press finished product specifications design pass.
In addition, the external diameter drafts is influential to the transversely deforming of hollow forging fin, the general big more horizontal expansion that is unfavorable for fin more of external diameter drafts.The external diameter drafts is decided by the difference of hollow forging diameter and finished product extended surface tube diameter, each reduction in pass of external diameter is controlled at 4～10 millimeters, and for the big finished product extended surface tube of fin height, the external diameter drafts can suitably reduce, for the little finished product extended surface tube of fin height, the external diameter drafts can suitably increase.
Internal mold adopts cylindrical common internal mold, and its length is generally at 50～55 millimeters.
Advantage of the present invention is: can adopt equipment-plug rolling unit of producing common seamless circular steel pipe to produce extended surface tube (except that straightener changes to some extent), saved the hot extrusion equipment of bulky complex, thereby opened up the prospect of utilizing existing production round steel pipe device fabrication extended surface tube, reduced production cost, reduced mould consumption, reduce the steel pipe torsional deformation, thereby improved yield rate.
Below accompanying drawing is carried out simple declaration:
Fig. 1 is a process chart of the present invention;
Fig. 2 is Φ 60 extended surface tube hot rolling pass figure of the present invention;
Fig. 3 is the present invention first road cold-drawn external mold figure;
Fig. 4 is the present invention's two, three, four, five passage cold-drawn external mold sketches.
With reference to accompanying drawing, we will do an explanation to the production of Φ 60 extended surface tubes.
Among Fig. 1,1 repaiies, 2 heats, 5 is that two roller horizontal perforated machines, 6 hot-rolling mills, 7 heading machines, 8～11 acid washing phosphorization saponification, 12 cold-drawns, 13 heat treatments (repeating 8～13 then), 14 alignings, 15 crops, 16 checks, 17 flaw detections, 18 oilings, 19 are packed for annular furnace for centering, 4 for the disconnected base of scale, 3 for pipe mill.
The pipe diameter is 95 millimeters of Φ, and perforation back hollow forging is of a size of 102 * 17.5(millimeter), 90 ° flat the rolling of not overturning adopted in hot rolling, and passage is 4 passages, and the hot rolling pass is seen Fig. 2, and its concrete size sees attached list 1.
In course of hot rolling, the change in size situation of the external diameter of its hollow forging and wall thickness sees attached list 2.
Φ 60 extended surface tubes adopt 5 passage cold-drawns, finish desired shape of extended surface tube and physical dimension.
Each passage external mold is seen Fig. 3 and Fig. 4, and 2,3,4,5 represent each passage among the figure, and the concrete size of its external mold sees attached list 3.
In 5 passage Cold Drawing Process, the diameter of its steel pipe and the situation of change of wall thickness see attached list 4.
An alternative embodiment of the invention is promptly produced Φ 38 * 47.5 * 5 extended surface tubes.Its production process and employed equipment are identical with Φ 60 * 80 * 6, and its pass design principle is also basic identical.Be omitted.
The extended surface tube that the method according to this invention produced, its quality problems can obtain satisfied answer by following subordinate list 5.
D-external mold external diameter
α-external mold gradient
β-inlet cone angle
γ-fin outlet cone angle
H-external mold thickness
A-goes out the prostomum width
B-work zone width
A-fin throat width
B-fin exit width
A
1-fin pass throat width
B
1-fin pass exit width
Claims (10)
1, a kind of method of producing extended surface tube comprises pipe scale break base, centering, heating, perforation.It is characterized in that: the production of extended surface tube adopts the method for hot rolling to obtain to have the hollow forging of blank fin, reaches desired shape and physical dimension through the multi-pass cold-drawn then.
2, according to the desired method of claim 1, its hot rolling is characterised in that: adopt the flat rolling method of 90 ° of the hollow forgings of not overturning, produce the blank fin of extended surface tube.
3, according to claim 1 or 2 desired methods, its hot rolling is characterised in that: the passage of hot rolling is 3～4 times.
4, according to any one the desired method in the claim 1～3, its hot rolling is characterised in that: during hot rolling, tube rolling roll pass roll gap is 18～25 millimeters up and down.
5, according to any one the desired method in the claim 1～4, its hot rolling is characterised in that: during hot rolling, the ratio of width to height of tube rolling roll pass is greater than 1.1 up and down.
6, according to the desired method of claim 1, its cold-drawn is characterised in that: the passage of cold-drawn is 3～5 times.
7, according to claim 1 or 6 desired methods, its cold-drawn is characterised in that: in former passage cold-drawns, cold drawing die at first compresses the fin height, makes the slight concave surface on its expansion pipe diameter.
8, according to claim 1 or 6 desired methods, its cold-drawn is characterised in that: near the final pass cold-drawn, the die cavity of steel pipe contact cold drawing die is in proper order: at first compress the fin width, then diameter of steel tube, contact the fin height at last, impel the fin cross directional stretch.
9, according to claim 1 or 6 desired methods, its cold-drawn is characterised in that: in the final pass cold-drawn in the end, cold drawing die at first compresses steel pipe fin width and external diameter, compresses the fin size then.
10, according to claim 1 or 6 desired methods, its cold-drawn is characterised in that: in the multi-pass Cold Drawing Process, each reduction in pass of waste external diameter of pipe is 4～10 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85101434A CN1003005B (en) | 1985-04-01 | 1985-04-01 | Manufacture of fin-tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85101434A CN1003005B (en) | 1985-04-01 | 1985-04-01 | Manufacture of fin-tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85101434A true CN85101434A (en) | 1985-10-10 |
| CN1003005B CN1003005B (en) | 1989-01-04 |
Family
ID=4791841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85101434A Expired CN1003005B (en) | 1985-04-01 | 1985-04-01 | Manufacture of fin-tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1003005B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102303065A (en) * | 2011-06-21 | 2012-01-04 | 攀钢集团成都钢钒有限公司 | Method for manufacturing seamless steel tube for vehicle-mounted large-diameter high pressure gas cylinder |
| CN106001157A (en) * | 2016-05-19 | 2016-10-12 | 常熟市异型钢管有限公司 | Manufacturing method for spline strip special for engineering excavator |
| CN106140865A (en) * | 2016-07-12 | 2016-11-23 | 江苏宏亿钢管有限公司 | The preparation method of seamless steel pipe |
| CN109226328A (en) * | 2018-11-23 | 2019-01-18 | 绍兴上虞正达管业有限公司 | A kind of red copper hose processing technology |
| CN109967988A (en) * | 2019-03-18 | 2019-07-05 | 青岛登辉机械配件有限公司 | The outer finned tube processing technology of internal screw thread |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100518989C (en) * | 2004-10-25 | 2009-07-29 | V&M德国有限公司 | Method for production of a seamless hot-finished steel tube and device for carrying out the method |
-
1985
- 1985-04-01 CN CN85101434A patent/CN1003005B/en not_active Expired
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102303065A (en) * | 2011-06-21 | 2012-01-04 | 攀钢集团成都钢钒有限公司 | Method for manufacturing seamless steel tube for vehicle-mounted large-diameter high pressure gas cylinder |
| CN102303065B (en) * | 2011-06-21 | 2013-08-28 | 攀钢集团成都钢钒有限公司 | Method for manufacturing seamless steel tube for vehicle-mounted large-diameter high pressure gas cylinder |
| CN106001157A (en) * | 2016-05-19 | 2016-10-12 | 常熟市异型钢管有限公司 | Manufacturing method for spline strip special for engineering excavator |
| CN106001157B (en) * | 2016-05-19 | 2018-05-22 | 常熟市异型钢管有限公司 | A kind of preparation method of engineering excavation machine Special flower spline |
| CN106140865A (en) * | 2016-07-12 | 2016-11-23 | 江苏宏亿钢管有限公司 | The preparation method of seamless steel pipe |
| CN106140865B (en) * | 2016-07-12 | 2019-08-30 | 江苏宏亿钢管有限公司 | The preparation method of seamless steel pipe |
| CN109226328A (en) * | 2018-11-23 | 2019-01-18 | 绍兴上虞正达管业有限公司 | A kind of red copper hose processing technology |
| CN109967988A (en) * | 2019-03-18 | 2019-07-05 | 青岛登辉机械配件有限公司 | The outer finned tube processing technology of internal screw thread |
| CN109967988B (en) * | 2019-03-18 | 2020-10-27 | 青岛登辉机械配件有限公司 | Processing technology of internal thread external finned tube |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1003005B (en) | 1989-01-04 |
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