CN107931331A - A kind of production method of two roller cold rolling seamless steel of high accuracy - Google Patents
A kind of production method of two roller cold rolling seamless steel of high accuracy Download PDFInfo
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- CN107931331A CN107931331A CN201711203624.3A CN201711203624A CN107931331A CN 107931331 A CN107931331 A CN 107931331A CN 201711203624 A CN201711203624 A CN 201711203624A CN 107931331 A CN107931331 A CN 107931331A
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- cold rolling
- steel
- roller
- seamless steel
- high accuracy
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 76
- 239000010959 steel Substances 0.000 title claims abstract description 76
- 238000005097 cold rolling Methods 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000005554 pickling Methods 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 11
- 230000007547 defect Effects 0.000 claims abstract description 5
- 239000002253 acid Substances 0.000 claims description 12
- 238000007127 saponification reaction Methods 0.000 claims description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 239000005864 Sulphur Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 3
- 239000011790 ferrous sulphate Substances 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 238000002386 leaching Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims 1
- 238000005098 hot rolling Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 abstract description 3
- 238000003801 milling Methods 0.000 abstract 1
- 230000001151 other effect Effects 0.000 abstract 1
- 238000005452 bending Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
- B21B27/025—Skew rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
- B21B45/0242—Lubricants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
- B21B45/0272—Cleaning compositions
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention discloses a kind of production method of two roller cold rolling seamless steel of high accuracy,The seamless steel pipe caliber φ 20mm produced by this method,More than wall thickness 2mm,Outside diameter,Id tolerance size range is within 0.02 0.04mm,Wherein this method includes heating steel billet,Hot-puncturing process,Cold-drawn finishing,Heat treatment,Pickling lubricates,The technological designs such as two roller cold rollings,Produce obtained two roller cold rolling seamless steel products and black making up the inner surface that three roller cold-rolled products produce by production technology characteristic,While the defects such as finish is low,By to traditional two roller mould for cold milling,Tube blank size,Product rolling mill practice,The redesign of equipment adjusting parameter,Two roller cold rollings are produced product size precision to be brought up in the range of 0.02 0.04mm by original >=0.1mm,Simplify with process,Process optimization,Production efficiency improves,Cost reduction and other effects.
Description
Technical field
The present invention relates to metallurgical technology field, is specially a kind of production method of two roller cold rolling seamless steel of high accuracy.
Background technology
With the rapid development of Domestic Automotive Industry in recent years, automobile market competition.Seamless steel pipe is as life
The raw material of auto parts and components are produced, steel pipe sizes precision, smoothness requirements are continuously improved in subsupplier man.Based on above-mentioned
Development trend, seamless steel pipe process optimization, raising product quality are imperative.Two roller cold rolling seamless steels of country production work at present
Skill is tube reducing in more than 20mm, subtracts wall and is controlled in 1-2mm, cogging lengthening coefficient between 2.2-2.6, the steel of this kind of technique productions
Pipe reaction force is big, the dimensional accuracy of steel pipe within 0.1mm, three roller cold rolling seamless steel precision controllings it is of a relatively high
Within 0.05mm；High tolerance size is produced in 0.02-0.04mm products, main production is：Steel billet sawing machine blanking
→ centering → hot-puncturing process is produced into hot-rolled tube billet（Hollow billet）→ hollow billet heat treatment → hollow billet crop end, section chamfering → acid
Cold inspection mill → pickling, phosphatization, the roller cold rolling finished product of the roller cold rolling of saponification → bis- → oil removing → heat treatment → aligning → acid phospholeum → tri- are washed,
And during by technique productions φ 20mm wall thickness 2mm above cold-rolled products, although tolerance dimension is qualified, because process characteristic is deposited
It cannot meet customer need in the defects of interior surface blackening, brightless, slight pockmark, and the production technology is because be two passages
Finish rolling, there are complex procedures, low production efficiency, the production cycle is long, processing charges is high the problems such as.
The content of the invention
In order to solve above-mentioned problems of the prior art, the present invention provides a kind of two roller cold roll seamless steel of high accuracy
The production method of pipe, is rationally designed by device to hole shape, roller opening, middle thickness of pipe wall, outside diameter, lengthening coefficient etc., both met
Two roller cold rolling dimensional accuracies are improved 0.02-0.04mm by the requirement of product endoporus roughness again.
To achieve the above object, it is provided by the invention lifting two roller cold rolling seamless steel production methods include heating steel billet,
Technological design, the wherein process routes such as hot-puncturing process, cold-drawn finishing, heat treatment, pickling lubrication, two roller cold rollings are：Steel billet is sawed
Bed blanking → centering → hot-puncturing process is produced into hot-rolled tube billet（Hollow billet）→ pickling it is cold inspection mill → pickling, phosphatization, saponification →
Cold-drawn → heat treatment → aligning → crop end → two chamfers → pickling, phosphatization, the roller cold rolling of saponification → bis- production.
Seamless steel pipe caliber φ 20mm, more than the wall thickness 2mm of this method production, outside diameter, id tolerance size range exist
Within 0.02-0.04mm, this method comprises the following steps：
The first step：Steel billet sawing machine blocks, and centering processing is carried out by puncher；
Second step：Heating of pipe blank carries out hot-puncturing process, bloom production into hollow billet；
3rd step：Preliminary pickling, through examining mill repair to enter lower a time；
4th step：Pickling, phosphatization, saponification process；
5th step：Steel pipe carries out preliminary cold-drawn finishing；
6th step：It is heat-treated after cold-drawn, reduces the hardness after steel pipe processing, reduce steel pipe tissue；
7th step：Cold rolling carries out straightening processing with pipe after heat treatment；
8th step：Cold rolling intermediate tube carries out crop end, and both ends carry out chamfered；
9th step：Cold rolling intermediate tube carries out sour phospholeum, lubricated
Tenth step：Finished product is produced using two-roll cold rolling mill, the roller opening size that wherein cold-rolling mill uses is according to mill product
The middle specific roll of tube blank size, cold-rolling mill head revolution number, feed are adjusted when finished product rolls, and are adjusted by calculating
Tube reducing wall thickness reducing amount during whole rolling, the control of rolling lengthening coefficient between 1.5-1.7mm；
11st step：Aligning, carries out steel pipe alignment processing using straightener, eliminates the bending situation produced in production process；
12nd step：Oil removing, steel pipe clean in except oil cylinder, remove steel pipe surfaces externally and internally greasy dirt, impurity；
13rd step：Immersion oil, after removing finish rolling greasy dirt, leaching antirust oil carries out antirust；
14th step：Examine, vortex, ultrasonic examination processing, check steel pipe surfaces externally and internally defect, micrometer, inside meter detection
Tolerance dimension；
15th step：Qualified products packaging and storage.
Preferably, heating steel billet is divided into preheating zone, heating zone, 3rd area of soaking zone using walking beam furnace, to steel billet into
Row Segmented heating, makes heating steel billet uniform, improves the efficiency of heating surface, and it is inclined that hollow billet surfaces externally and internally, wall thickness after perforating can be effectively ensured
Difference, organize to obtain quality.
It is further preferred that preheating zone temperature range is 560oC-660oC, Heating Zone Temperature section are 1080oC~
1160oC, soaking zone section are 1220oC-1270oC；According to heating various outer diameter steel billet, stepping furnace tap FREQUENCY CONTROL 25 ~
40S/ branch, uses full-automatic 50 Mannesmann piercers of φ production hollow billet after heating steel billet tapping.
Preferably, sour cylinder sulphur acid strength is between 15%-25%, and below ferrous sulfate content 100g/L, temperature is in 40-
70oC；Phosphatization cylinder total acidity 25-37.5 drops, free acidity 1.5-2.5 drops, total acid free acid ratio is between 15-20, phosphatization cylinder
Temperature is maintained at 65oC-75oC；Between saponification cylinder PH7.5-9.5, temperature is maintained at 70oC-85oC。
In the range of φ 20- φ 70mm produced by the invention, wall thickness 2-8mm, tolerance grade is high-precision in 0.02-0.04mm
Two roller cold rolling seamless steels are spent, traditional φ 20mm wall thickness 2mm above heavy wall cold rolling seamless steels is changed and is opened by two roller cold rollings
Base, then the technique produced by three roller cold rollings；So as to improve heavy caliber thick wall High Precision Cold seamless steel tube production efficiency, product
Inner surface finish, realizes process simplification, process optimization, production efficiency raising, the purpose of cost reduction.
Brief description of the drawings
Fig. 1 is the structure size schematic diagram of cold-rolling mill roll in the present invention；
Fig. 2 is roller opening scale diagrams in the present invention.
Embodiment
A kind of production method of two roller cold rolling seamless steel of high accuracy of the present invention, the seamless steel pipe of this method production
Caliber φ 20mm, more than wall thickness 2mm, within 0.02 ~ 0.04mm, its production stage is as follows for outside diameter, id tolerance size range：
The first step：Steel billet sawing machine blocks, and centering processing, centering φ 16- φ 18mm drill bits, punching are carried out by puncher
Depth is handled in the range of 100-150mm by puncher centering, and the moment top that steel billet bites in perforation can be made accurate right
Quasi- steel billet center, so as to reduce hollow billet eccentricity after perforation, reduces top and the direct Contact impact force of steel billet,
Improve head lifetime.
Second step：Heating of pipe blank carries out hot-puncturing process, and bloom production is used walking beam furnace into hollow billet, heating steel billet
It is divided into preheating zone（560oC-660oC）, heating zone（1080oC-1160oC）, 3rd area of soaking zone（1220oC-1270oC）, to steel billet
Segmented heating is carried out, makes heating steel billet uniform, improves the efficiency of heating surface；According to heating various outer diameter steel billet, stepping furnace tapping frequency
Rate control uses full-automatic 50 Mannesmann piercers of φ production hollow billet after 25-40S/ branch, heating steel billet tapping.
3rd step：Preliminary pickling, through examining mill repair to enter lower a time（Use louvre blade or grinding wheel）；
4th step：Pickling, phosphatization, saponification process, sour cylinder sulphur acid strength is between 15% ~ 25%, ferrous sulfate content 100g/L
Hereinafter, temperature is in 40-70oC；Phosphatization cylinder total acidity 25-37.5 drops, free acidity 1.5-2.5 drops, total acid free acid ratio exist
Between 15-20, phosphatization cylinder temperature is maintained at 65oC-75oC；Between saponification cylinder PH7.5-9.5, temperature is maintained at 70oC-85oC。
5th step：Steel pipe carries out preliminary cold-drawn finishing；
6th step：It is heat-treated after cold-drawn, reduces the hardness after steel pipe processing, reduce steel pipe tissue；
7th step：Cold rolling carries out straightening processing with pipe after heat treatment；
8th step：Cold rolling intermediate tube carries out crop end, and both ends carry out chamfered；
9th step：Cold rolling intermediate tube carries out sour phospholeum, lubricated, and processing method is same as above the 4th step.
Tenth step：Produce finished product using two-roll cold rolling mill, in the invention maximum feature used in production process mould,
The design of device parameter etc.：
Produce roll used by two roller cold-rolled products to compare traditional roll, roll circumference profit is reduced after redesign
With rate, roll circumference utilization rate is adjusted to 1/3 or so, radian is shown in Fig. 1 between 100 ° -150 °.
2. it is according to tube blank size among mill product to produce roll roller opening size used by two roller cold-rolled products
Specific roll, roller opening size are more than the production middle pipe outside diameter 10mm-15mm of finished product, see Fig. 2.
3. cold-rolling mill head revolution number, feed are adjusted when finished product rolls, two roller cold-rolling equipment parameters ensure to roll
Machine head turns round number >=80 time/h, in the range of the above of feed >=3.5mm/ time.
4. tube reducing wall thickness reducing amount when finished product is by calculating adjustment rolling, when mill product use middle pipe, diameter is more than
Institute mill product outside diameter 10-15mm, wall thickness reducing amount control are controlled between 1.5-1.7mm in 0.5-1mm, rolling lengthening coefficient.
11st step：Aligning, carries out steel pipe alignment processing using straightener, eliminates the bending feelings produced in production process
Condition.
12nd step：Oil removing, by being cleaned in except oil cylinder, removes steel pipe surfaces externally and internally greasy dirt, impurity；
13rd step：Immersion oil, after removing finish rolling greasy dirt, leaching antirust oil carries out antirust；
14th step：Examine, vortex, ultrasonic examination processing, check steel pipe surfaces externally and internally defect, micrometer, inside meter detection
Tolerance dimension；
15th step：Qualified products packaging and storage.
Instinct invention, but do not limit the invention in any way are described in detail below with reference to instantiation.
Example one：
Produce 35#64*4.5*55 products in the present invention to produce according to aforementioned production method, through measuring outside diameter, internal diameter（mm）See below
Table.
Table one
Table two
Example two
Our company produces 35#66.5*5 products, and product is produced according to foregoing invention process, through measuring outside diameter, internal diameter（mm）
It see the table below.
Table one
Table two
Data can be seen that the invention produces two roller cold rolling seamless steels from two above example table, be entirely capable of meeting above-mentioned hair
Outside diameter in bright method, tolerance in the range of 0.02 ~ 0.04mm of internal diameter, and production efficiency significantly improves, and endoporus roughness is bright
Aobvious to improve, endoporus color is bright.
Claims (8)
1. a kind of production method of two roller cold rolling seamless steel of high accuracy, the seamless steel pipe caliber φ 20mm of this method production, wall
Thick more than 2mm, outside diameter, id tolerance size range are within 0.02-0.04mm, it is characterised in that this method includes following step
Suddenly：
The first step：Steel billet sawing machine blocks, and centering processing is carried out by puncher；
Second step：Heating of pipe blank carries out hot-puncturing process, bloom production into hollow billet；
3rd step：Preliminary pickling, through examining mill repair to enter lower a time；
4th step：Pickling, phosphatization, saponification process；
5th step：Steel pipe carries out preliminary cold-drawn finishing；
6th step：It is heat-treated after cold-drawn, reduces the hardness after steel pipe processing, reduce steel pipe tissue；
7th step：Cold rolling carries out straightening processing with pipe after heat treatment；
8th step：Cold rolling intermediate tube carries out crop end, and both ends carry out chamfered；
9th step：Cold rolling intermediate tube carries out sour phospholeum, lubricated
Tenth step：Finished product is produced using two-roll cold rolling mill；
11st step：Aligning, alignment processing is carried out using straightener to steel pipe；
12nd step：Oil removing, steel pipe carry out oil removal treatment in except oil cylinder；
13rd step：Immersion oil, after removing finish rolling greasy dirt, leaching antirust oil carries out antirust；
14th step：Examine, vortex, ultrasonic examination processing, check steel pipe surfaces externally and internally defect, micrometer, inside meter detection
Tolerance dimension；
15th step：Qualified products packaging and storage.
A kind of 2. production method of two roller cold rolling seamless steel of high accuracy according to claim 1, it is characterised in that：
Second step：Perforated steel billit uses full-automatic temperature-controlling walking beam furnace when heating, and divides three-region type preheating, heating, soaking
The preperforative heating work of hot rolling of steel billet is completed, the walking beam furnace efficiency of heating surface is high, homogeneous heating, after perforation being effectively ensured
Hollow billet surfaces externally and internally, wall thickness deviation, the quality of tissue.
A kind of 3. production method of two roller cold rolling seamless steel of high accuracy according to claim 2, it is characterised in that：
Walking beam furnace is respectively 560 in the temperature that three-region type is preheated, heats, hankeredoC-660 oC、1080 oC -1160 oC
With 1220 oC -1270 oC；According to heating various outer diameter steel billet, walking beam furnace taps FREQUENCY CONTROL in 25-40S/ branch, steel
Full-automatic 50 Mannesmann piercers of φ production hollow billet is used after base heating tapping.
A kind of 4. production method of two roller cold rolling seamless steel of high accuracy according to claim 1, it is characterised in that：
4th step：Sour cylinder sulphur acid strength is between 15%-25% in acid cleaning process, below ferrous sulfate content 100g/L, temperature
In 40-70 oC；Phosphatization cylinder total acidity 25-37.5 drops in parkerizing process, free acidity 1.5-2.5 drops, total acid free acid ratio exist
Between 15-20, phosphatization cylinder temperature is maintained at 65 oC -75 oC；In saponification process between saponification cylinder PH7.5-9.5, temperature is maintained at
70 oC ~85 oC。
A kind of 5. production method of two roller cold rolling seamless steel of high accuracy according to claim 1, it is characterised in that：
The roll circumference utilization rate of the two-roll cold rolling mill is 1/3 or so, and radian is 100o-150oBetween.
A kind of 6. production method of two roller cold rolling seamless steel of high accuracy according to claim 1, it is characterised in that：
The roller opening size of the two-roll cold rolling mill is more than the middle pipe outside diameter 10mm-15mm of production finished product.
A kind of 7. production method of two roller cold rolling seamless steel of high accuracy according to claim 1, it is characterised in that：
The two-roll cold rolling mill head turns round number >=80 time/h, feed >=more than 3.5mm/ times.
A kind of 8. production method of two roller cold rolling seamless steel of high accuracy according to claim 1, it is characterised in that：
Tube reducing wall thickness reducing amount during by calculating adjustment rolling, when rolled steel tube, use middle pipe, and diameter is more than institute's rolled steel tube
Outside diameter 10-15mm, wall thickness reducing amount control are controlled between 1.5-1.7mm in 0.5-1mm, rolling lengthening coefficient.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711203624.3A CN107931331B (en) | 2017-11-27 | 2017-11-27 | A kind of production method of two roller cold rolling seamless steel of high-precision |
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| CN201711203624.3A CN107931331B (en) | 2017-11-27 | 2017-11-27 | A kind of production method of two roller cold rolling seamless steel of high-precision |
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| CN107931331B CN107931331B (en) | 2019-09-03 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109158435A (en) * | 2018-08-08 | 2019-01-08 | 浙江辛子精工机械股份有限公司 | A kind of cold tube rolling outer surface oil-scraping device |
| CN111043408A (en) * | 2019-11-08 | 2020-04-21 | 安徽莱鑫精密特种钢管有限公司 | Novel stainless steel seamless steel pipe |
| CN111283011A (en) * | 2020-03-09 | 2020-06-16 | 河北金奥管业有限公司 | Production method of seamless steel tube of automobile steering column |
| CN111420993A (en) * | 2020-04-07 | 2020-07-17 | 浙江巨龙钢业有限公司 | High-precision seamless steel tube cold rolling equipment and machining method thereof |
| CN112276479A (en) * | 2020-09-07 | 2021-01-29 | 湖北隐冠轴业有限公司 | Rough machining process for main shaft of air-conditioning compressor of new energy automobile |
| CN113245369A (en) * | 2021-05-19 | 2021-08-13 | 张家港保税区恒隆钢管有限公司 | Manufacturing process of pipe for PMMA reactor |
| CN113441553A (en) * | 2021-06-30 | 2021-09-28 | 北京科技大学 | Seamless pipe and cold rolling method thereof |
| CN113600637A (en) * | 2021-06-30 | 2021-11-05 | 北京科技大学 | Seamless steel pipe and preparation method thereof |
| WO2022095272A1 (en) * | 2020-11-04 | 2022-05-12 | 太原科技大学 | Method for preparing high-performance and difficult-to-deform metal precision seamless tube |
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|---|---|---|---|---|
| CN109158435A (en) * | 2018-08-08 | 2019-01-08 | 浙江辛子精工机械股份有限公司 | A kind of cold tube rolling outer surface oil-scraping device |
| CN111043408A (en) * | 2019-11-08 | 2020-04-21 | 安徽莱鑫精密特种钢管有限公司 | Novel stainless steel seamless steel pipe |
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| CN111420993A (en) * | 2020-04-07 | 2020-07-17 | 浙江巨龙钢业有限公司 | High-precision seamless steel tube cold rolling equipment and machining method thereof |
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| WO2022095272A1 (en) * | 2020-11-04 | 2022-05-12 | 太原科技大学 | Method for preparing high-performance and difficult-to-deform metal precision seamless tube |
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| CN113441553A (en) * | 2021-06-30 | 2021-09-28 | 北京科技大学 | Seamless pipe and cold rolling method thereof |
| CN113600637A (en) * | 2021-06-30 | 2021-11-05 | 北京科技大学 | Seamless steel pipe and preparation method thereof |
| CN113600637B (en) * | 2021-06-30 | 2022-04-15 | 北京科技大学 | Seamless steel pipe and preparation method thereof |
| CN113441553B (en) * | 2021-06-30 | 2022-07-22 | 北京科技大学 | Seamless pipe and cold rolling method thereof |
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