CN1023083C - Method for producing straight-tooth shape inside ribbed pipe - Google Patents
Method for producing straight-tooth shape inside ribbed pipe Download PDFInfo
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- CN1023083C CN1023083C CN 92108409 CN92108409A CN1023083C CN 1023083 C CN1023083 C CN 1023083C CN 92108409 CN92108409 CN 92108409 CN 92108409 A CN92108409 A CN 92108409A CN 1023083 C CN1023083 C CN 1023083C
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- pipe
- tooth
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- finned tube
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Abstract
The present invention relates to a method for producing a straight-tooth-shaped inner ribbed pipe. The present invention relates to the field of metal rolling, and is particularly to suitable for the production of a thin-walled inner ribbed pipe. The present invention is characterized in that an LD circular pipe roll is adopted; a core rod which is used for a thick rolled circular pipe in the circular pipe roll is replaced with a core rod which is fit with the shape of a desired straight-tooth-shaped rib; then, a pipe blank with a certain outer diameter and wall thickness is selected according to product specifications and a lengthening coefficient which can be borne by the roll forming at one step; the pipe blank is rolled into the desired straight-tooth-shaped inner ribbed pipe at one step.
Description
A kind of straight-tooth shape internally finned tube production method.The present invention relates to metal rolled field, and be specially adapted to the production of thin-walled internally finned tube.
Multinomial characteristics such as straight-tooth shape internally finned tube has the rate of heat exchange height as the oil cooling service pipe on the high-power transformer forced circulation forced air cooler, and the heat radiation cooling velocity is fast.Therefore more and more favored.No. 4428220 patents of the U.S. have disclosed the method that a kind of tube wall is shaped.It is that the plug with tube wall required form kissing is inserted in the pipe, then pipe and plug are fixed on the rotating instrument, when pipe and plug move axially together with instrument, four forging hammers that are mutually the right angle with pipe with the pipe that instrument rotates, make inside pipe wall be processed into shape with the plug kissing with regard to cold forging.This method that inside pipe wall is shaped only can be processed the thick thick-walled pipe that needs shape in the fixed tube.And only be 1～2 millimeter elongated oil cooling service pipe for wall thickness, obviously adopt cold-forging method to process.In addition, adopt cold-forging method also can't reach all higher oil cooling service pipe to dimensional accuracy and fineness product quality requirement.
Before the present invention, the our factory once adopted the cold skill of exchanging work to process.Though this technology can be dialled the elongated thin-walled internally finned tube of system, finished product surfaces externally and internally fineness is relatively poor, and the finished size precision is also unsatisfactory.Particularly because cold group of system technology is out of shape quantitative limitation, need pipe is dialled the cold finished product that pushes of system ability through multiple tracks, so technology is various, production cycle is long, and dial in the system profile of tooth in multiple tracks and be difficult to aim at, cause the finished product profile of tooth irregular, tooth depth is dialled not high (influencing radiating efficiency), and lumber recovery only is 36%.
Purpose of the present invention is exactly to develop the straight-tooth shape thin-walled internally finned tube production method of a kind of energy time processing moulding.
The our factory is developed into the production method that once cold rolling becomes straight-tooth shape internally finned tube finally through test of many times.The our factory adopts LD pipe milling train, and plug that pipe uses is rolled in pipe milling train Central Plains change plug with required straight-tooth shape internal-rib shape kissing into, select the pipe of certain external diameter and wall thickness then according to trimmed size and the once rolling lengthening coefficient that can bear for use, once be rolled into required straight-tooth shape internally finned tube.The selection of lengthening coefficient and steel grade have certain relation, and in general, the carbon content of steel and alloying element amount are high more, and selected lengthening coefficient should be low more.
The invention is characterized in that it comprises the following steps:
1, selects base: the pipe of selecting certain external diameter and wall thickness according to trimmed size and the once rolling lengthening coefficient that can bear, be 25.5 ± 0.1mm for example for the needs external diameter, wall thickness is 1.3 ± 0.1mm, the product of No. 10 steel 18 tooth internally finned tubes of straight-tooth tooth depth 〉=1mm.It is 28.8 ± 0.16mm that the our factory adopts external diameter, wall thickness is No. 10 cylindrical steel tube pipes of 2.6～2.8mm, for the needs external diameter is ∮ 19 ± 0.1mm, wall thickness is 1.3 ± 0.1mm, No. 10 steel 18 tooth internally finned tube products of tooth depth 〉=1mm, it is 22 ± 0.1 millimeters that the our factory adopts external diameter, wall thickness is 2.5～2.6 millimeters No. 10 cylindrical steel tube pipes, for external diameter is 27 ± 0.1 millimeters, wall thickness 1.3 ± 0.1mm, No. 10 steel 10 tooth internally finned tubes of tooth depth 〉=1mm, just adopting external diameter is 30 ± 0.1, wall thickness is 2.5～2.6 millimeters No. 10 pipe pipes.
2, pickling, cleaning; Pipe needs through pickling before rolling and cleans removing the iron scale and the greasy dirt of pipe surfaces externally and internally, for No. 10 steel, can adopt 10～15% sulfuric acid solution to carry out pickling.
3, cold rolling: as on LD pipe milling train, to be rolled, be changed to plug with required finished product straight-tooth shape internal-rib shape kissing with rolling plug that pipe uses originally, Fig. 1 illustrates and produces employed plug schematic diagram in the straight-tooth shape internally finned tube, (1) is connecting screw among the figure, (2) be the transition awl, (3) be the workspace, the profile of workspace should with required finished product straight-tooth shape internal-rib shape kissing, (4) are for unloading the plug wrench.Fig. 2 illustrates among Fig. 1 A-A profile in the workspace.The rolling lengthening coefficient of selecting for use determines through test of many times, and for No. 10 steel, it is 1.5～2.0 comparatively suitable generally to select for use, is embodiment below.
(1) finished product is No. 10 steel 18 tooth internally finned tubes, trimmed size 25.5 ± 0.1mm, wall thickness 1.3 ± 0.1mm, tooth depth 〉=1mm.
Rolling the back tooth depth before preface is rolled extends
Extra footpath (mm) wall thickness (mm) external diameter (mm) wall thickness (mm) is coefficient (mm)
1 28.80～28.83 2.65～2.86 25.5 1.24～1.39 1.15～1.17 1.56
2 28.81～28.83 2.59～2.91 25.5 1.29～1.41 1.11～1.18 1.60
3 28.83 2.66～2.79 25.5 1.28～1.37 1.12～1.21 1.58
4 28.83 2.59～2.98 25.5 1.37～1.61 1.10～1.14 1.62
5 28.85～28.88 2.73～2.83 25.5 1.27～1.32 1.17～1.18 1.60
6 28.83～28.85 2.69～2.89 25.5 1.29～1.37 1.12～1.17 1.61
7 28.87～28.82 2.69～2.83 25.5 1.29～1.34 1.17～1.18 1.54
8 28.77～28.81 2.56～2.93 25.5 1.22～1.37 1.14～1.22 1.60
9 28.76～28.80 2.63～2.82 25.5 1.27～1.39 1.13～1.17 1.56
(2) finished product is 10 steel, 18 tooth internally finned tubes, trimmed size external diameter 19 ± 0.1, wall thickness 1.3 ± 0.1mm, tooth depth 〉=1mm
Rolling back tooth depth was extended before preface was rolling
Extra footpath (mm) wall thickness (mm) external diameter (mm) wall thickness (mm) is coefficient (mm)
1 22 2.7 19 1.3 1.15 2.0%
2 22 2.5～2.6 19 1.3 1.12 1.8～1.9
(3) finished product is No. 10 tooth internally finned tubes of No. 10 steel, trimmed size: external diameter 27 ± 0.1mm, wall thickness 1.3 ± 0.1mm, tooth depth 〉=1mm.
The employing external diameter is 30mm, and wall thickness is the circular pipe blank of 2.5～2.6mm, and rolling the back external diameter is 27mm, wall thickness 1.22～1.25mm, and tooth depth 1.15mm, lengthening coefficient are 1.6～1.7.
So find out No. 10 steel from embodiment.The lengthening coefficient of selecting for use is comparatively suitable in 1.5～2.0 scopes.
3, aligning: in general cold rolling finished product need not aligned, and has the nonstraightness defective but work as plug itself, at this moment the essential aligning of finished product.
4, crop end: all have the section profile of tooth of certain-length irregular because of rolling back finished product head, thereby must cut end to end.
5, check: require to test according to finished product
6, oiling packing
Comparing with cold group of production in the past, is 25.5mm to requiring external diameter equally, wall thickness 1.3mm, and the thick tooth internally finned tube product of tooth depth 〉=1mm is selected same pipe for use.But just once cold rolling moulding of the present invention, but in the past cold exchanged work skill just need through three times cold group, thereby it is middle necessary through the secondary intermediate heat-treatment, and according to assay, adopt appearance in the finished product of the present invention and fineness up to ∨ 8～∨ 9, the dimensional accuracy height, tooth depth can reach more than the 1.1mm, and profile of tooth is regular, and cold group product surface fineness only is ∨ 6～∨ 7, dimensional accuracy is low, tooth depth only reaches 0.9mm, and profile of tooth is irregular, is particularly significantly, adopt lumber recovery of the present invention up to more than 90%, and cold lumber recovery of exchanging work skill only is 36%.
Production technology has been simplified in employing of the present invention greatly, and product quality and lumber recovery are significantly improved, because one-shot forming has replaced multiple tracks to dial system, thereby has improved the economic benefit of factory greatly.
Claims (4)
1, a kind of straight-tooth shape internally finned tube production method is characterized in that it comprises the following steps:
(1) selects base, select the pipe of certain external diameter and wall thickness according to trimmed size and the once rolling lengthening coefficient that can bear;
(2) pickling, cleaning, pipe need through pickling before rolling and clean to remove the iron scale and the greasy dirt of pipe surfaces externally and internally;
(3) cold rolling, on 10 pipe milling trains, be rolled, be changed to plug with required finished product straight-tooth shape internal-rib shape kissing with rolling plug that pipe uses originally;
(4) crop end;
(5) require to test according to finished product;
(6) oiling packing.
2, internally finned tube production method as claimed in claim 1 is characterized in that, the product after cold rolling is checked before crop end.
3, internally finned tube production method as claimed in claim 1 or 2 is characterized in that, for producing No. 10 steel 18 tooth internally finned tube products, lengthening coefficient selects 1.5～2.0 for use.
4, as claim 1,2 or 3 described internally finned tube production methods, it is characterized in that, said and plug straight-tooth shape internal-rib shape kissing includes connecting screw (1), transition awl (2), plug wrench (4) is unloaded in workspace (3), the shape of workspace (3) should with required straight-tooth shape internal-rib shape kissing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92108409 CN1023083C (en) | 1992-05-09 | 1992-05-09 | Method for producing straight-tooth shape inside ribbed pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92108409 CN1023083C (en) | 1992-05-09 | 1992-05-09 | Method for producing straight-tooth shape inside ribbed pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1066012A CN1066012A (en) | 1992-11-11 |
| CN1023083C true CN1023083C (en) | 1993-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92108409 Expired - Fee Related CN1023083C (en) | 1992-05-09 | 1992-05-09 | Method for producing straight-tooth shape inside ribbed pipe |
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| Country | Link |
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| CN (1) | CN1023083C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392854B (en) * | 2011-07-15 | 2013-10-30 | 江苏联动轴承有限公司 | Toothed cold rolling method of one-way bearing toothed ferrule |
| CN103506352A (en) * | 2012-06-29 | 2014-01-15 | 中国有色金属工业第六冶金建设有限公司 | Construction method for oil flushing for installation of hydraulic pipeline of rolling mill |
| CN111408624A (en) * | 2020-03-26 | 2020-07-14 | 太原科技大学 | Double-core-rod mechanism and method for rolling metal pipe |
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1992
- 1992-05-09 CN CN 92108409 patent/CN1023083C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1066012A (en) | 1992-11-11 |
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| C10 | Entry into substantive examination | ||
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| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |