CN1172757C - Inner wall quality controlling method for fine seamless alloy tube - Google Patents
Inner wall quality controlling method for fine seamless alloy tube Download PDFInfo
- Publication number
- CN1172757C CN1172757C CNB001360205A CN00136020A CN1172757C CN 1172757 C CN1172757 C CN 1172757C CN B001360205 A CNB001360205 A CN B001360205A CN 00136020 A CN00136020 A CN 00136020A CN 1172757 C CN1172757 C CN 1172757C
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- milling train
- pipe
- stages
- roll
- wall
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 13
- 239000000956 alloy Substances 0.000 title claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 12
- 238000005097 cold rolling Methods 0.000 claims abstract description 9
- 238000003801 milling Methods 0.000 claims description 17
- 238000005242 forging Methods 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims 1
- 238000003908 quality control method Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 6
- 210000005239 tubule Anatomy 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011785 micronutrient Substances 0.000 description 1
- 235000013369 micronutrients Nutrition 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Control Of Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to an alloy seamless pipe; more specifically, a quality control method for the inner wall of an alloy seamless pipe with a small radius. The method comprises the operation steps that alloy forged round rods are made by a machine and drilled so that the pipe blanks are obtained; the pipe blanks are rolled through cold rolling on rolling mills 60, 30, 15, 12 and 8 in sequence, and secondary empty sinking is finally carried out. The present invention can improve the quality of the inner wall of a seamless pipe with a small radius, and hot perforation is avoided in a quality control technical method; consequently, the present invention has the advantage that products have small deflection and greatly improved quality.
Description
Technical field
The present invention relates to the alloy seamless pipe, specifically a kind of inner wall quality controlling method for fine seamless alloy tube.
Background technology
In the prior art, conventional tubing machining process route often adopts: hot piercing → cold rolling → cold-drawn → cold rolling → be cold drawing to production tube, especially to the tubule of minor diameter, generally all use the method for cold-drawn to finish, the size of the cold rolling tubing of this process route minimum is also more than Φ 6mm, finish by the cold-drawn of a plurality of passages then, for the finished product pipe diameter is Φ 3mm size, be deformed into the finished size that Φ 3mm must just can reach Φ 3mm through the drawing of multi-pass from Φ 6mm, the problem that this technology exists is that internal surface of pipe is in free state in deformation process, do not subtract under the deformation state of wall thickness from the tube reducing of Φ 6mm to Φ 3mm multi-pass, will inevitably make inner surface wrinkling, the result causes the interior circle of caliber to be the profile of tooth state, and does not reach index request; The result that seamless pipe empty sinking process stress strain is simultaneously resolved shows that the empty sinking passage is many more under the identical condition of total deformation, is out of shape inhomogeneous more.The distortion that drawing produces is uneven in the seamless pipe cross section.Uneven degree and drawing process are closely related, even total deformation is identical, different drawing process, it is out of shape also difference of uneven degree, promptly adopts the highest equivalent strain of two pass time empty sinking technology inwall to be far longer than near single pass empty sinking technology inwall the highest equivalent strain.
Summary of the invention
In order to overcome above-mentioned deficiency, the purpose of this invention is to provide a kind of inner wall quality controlling method for fine seamless alloy tube that can improve the inwall quality of thin footpath seamless pipe.
To achieve these goals, technical scheme of the present invention is:
Be intended to control thin diameter tube inwall quality, its operating procedure is: the alloy forging pole adds, holes into pipe through machine, and cold rolling on Φ 60mm, Φ 30mm, Φ 15mm, Φ 12mm and Φ 8mm milling train adopts a time empty sinking at last then;
Its rolling mill practice is specially: roll Φ 34mm by Φ 57mm by stages on Φ 60mm milling train, on Φ 30mm milling train, roll Φ 17mm by Φ 34mm by stages, on Φ 15mm milling train, roll Φ 11mm by Φ 17mm by stages, on Φ 12mm milling train, roll Φ 8mm by Φ 11mm by stages, on Φ 8mm milling train, roll Φ 6mm by Φ 8mm by stages.
The present invention compared with prior art has following advantage:
The present invention's preparation pipe of holing mainly adopts multi-pass cold rolling, and last only empty sinking process can obtain higher inwall quality, and the tubule inner wall roughness is not more than 2 μ m.Yet conventional hot piercing or extrusion tube blank adopt the method for pulling out combination of rolling cold rolling, cold-drawn to produce thin diameter tube, have higher production efficiency, but the tubule inner wall roughness are greater than the present invention.Further because hot piercing produces the big influence of deflection to pipe performance, and can delay subsequent handling, cause the inwall quality lower, and the present invention avoid hot piercing on the quality control process, make the product deflection little, quality improves greatly.
The specific embodiment
Below in conjunction with embodiment the present invention is described in further detail.
Experiment through the low segregation technology that homogenizes, is adjusted the control micronutrient levels with steel, the employing vacuum induction furnace smelting, is cast into the 20-25kg spindle, and steel ingot adds through machine and strips off the skin, heats forged, is swaged into the pole of Φ 65 through three fire.
The heating schedule of ingot casting: 1150 ℃ of heating-up temperatures
Open and forge 1100-1120 ℃ of temperature
Stop forging 850 ℃ of temperature
The pole of Φ 65mm adds, holes into the pipe of Φ 57mm * 11mm through machine, so both can eliminate the artificial defect in the operation of rolling, and drill centers also will be eliminated the inner defective such as loose that exists simultaneously, and will be very favourable to the quality of assurance finished product tubing.
Concrete cold-rolling process is as follows:
1. on Φ 60mm milling train, the rolling mill practice process:
Φ57mm×11mm→Φ52mm×10mm→Φ48mm×9mm→Φ46mm×
2. on Φ 30mm milling train, the rolling mill practice process:
Φ34mm×5mm→Φ31mm×4.6mm→Φ28mm×4.2mm→
Φ25mm×3.7mm→Φ22mm×3.2mm→Φ19mm×2.8mm→
3. rolling mill practice process on Φ 15mm milling train:
Φ17mm×2.4mm→Φ15mm×2.1mm→Φ13mm×1.8mm→
4. rolling mill practice process on Φ 12mm milling train:
5. rolling mill practice process on Φ 8mm milling train:
6. empty sinking process
The annealing process of taking in the operation of rolling is 1050 ℃, is incubated 30 minutes, water-cooled.Behind the following tube rolling of Φ 8mm, adopt vacuum annealing to handle.Its treatment process is 1000 ℃, is incubated 5～10 minutes, logical argon gas cooling.
Above-mentioned three kinds of specification thin diameter tubes to preparation, choose sample arbitrarily, survey external diameter with micrometer, use the contact pilotage inductance method, measure thin diameter tube inner wall surface roughness, testing instruments are with 2201 type surface roughness inspection record instrument, the chaining pin of receptor slides along measured surface, the surface profile peak valley causes the chaining pin displacement, and displacement makes the inductance coil electric quantity change and can write down signal and the curve that draws, and the profile arithmetic deviation value of the tubule inwall of measuring: Ra is 2 μ m (being equivalent to 3.2-1.6).
Relevant comparative example:
The flexible thin diameter tube of domestic a certain special alloy adopts the tubing processing technology of low stream, and its technical indicator is as follows:
Specification requirement: Φ 3.0mm * 0.5mm, Φ 3.0mm * 0.6mm, Φ 3.0mm * 0.7mm
Wall thickness tolerance: ± 0.5 * 8%mm, ± 0.6 * 8%mm, ± 0.7 * 8%mm
Outer tube diameter tolerance :+0.05mm
Tensile property: σ
b〉=690MPa, δ 〉=40%
Meet stainless steel tube crooked standard (bending radius 4d, angle of bend 180
Crooked:
Degree, pipe do not split, do not wrinkle, not flat)
In pipe length direction 100mm intort 0-180 degree, reversed torsion
Reverse:
Five flawlesses
Pipe material: the technical indicator that meets the alloy that homogenizes
Inner wall roughness: be not more than Ra 3.2 μ m
Nondestructive inspection: be up to the standards, (artificial defect is 0.1mm) meets the requirements
As seen the requirement that the combined process flow process can not satisfy inner wall roughness is pulled out in general rolling.
Claims (1)
1. inner wall quality controlling method for fine seamless alloy tube, the alloy forging pole adds, holes into pipe through machine, it is characterized in that its operating procedure is: cold rolling on Φ 60mm, Φ 30mm, Φ 15mm, Φ 12mm and Φ 8mm milling train successively then, after a time empty sinking get final product; Its rolling mill practice is specially: roll Φ 34mm by Φ 57mm by stages on Φ 60mm milling train, on Φ 30mm milling train, roll Φ 17mm by Φ 34mm by stages, on Φ 15mm milling train, roll Φ 11mm by Φ 17mm by stages, on Φ 12mm milling train, roll Φ 8mm by Φ 11mm by stages, on Φ 8mm milling train, roll Φ 6mm by Φ 8mm by stages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001360205A CN1172757C (en) | 2000-12-26 | 2000-12-26 | Inner wall quality controlling method for fine seamless alloy tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001360205A CN1172757C (en) | 2000-12-26 | 2000-12-26 | Inner wall quality controlling method for fine seamless alloy tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1360979A CN1360979A (en) | 2002-07-31 |
| CN1172757C true CN1172757C (en) | 2004-10-27 |
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ID=4597026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001360205A Expired - Fee Related CN1172757C (en) | 2000-12-26 | 2000-12-26 | Inner wall quality controlling method for fine seamless alloy tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1172757C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102172822B (en) * | 2011-03-24 | 2013-01-09 | 上海奉贤钢管厂 | Processing technology for high-precision heavy wall pipe |
| CN103934304B (en) * | 2014-04-14 | 2018-04-03 | 重庆钢铁(集团)有限责任公司 | A kind of forming method of the accurate small-diameter thick-walled high temperature alloy pipes of aviation |
| CN106019351B (en) * | 2016-07-21 | 2019-01-08 | 中国科学院高能物理研究所 | Extremely low noise particle detection system and reading chip |
| CN112845658B (en) * | 2021-01-05 | 2022-09-16 | 太原科技大学 | Preparation method of UNS N08825 small-caliber precise seamless tube |
-
2000
- 2000-12-26 CN CNB001360205A patent/CN1172757C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1360979A (en) | 2002-07-31 |
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