CN100463733C - Method for processing titanium pipe used for computer mobile hard disk main shaft sleeve - Google Patents
Method for processing titanium pipe used for computer mobile hard disk main shaft sleeve Download PDFInfo
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- CN100463733C CN100463733C CNB2007100253607A CN200710025360A CN100463733C CN 100463733 C CN100463733 C CN 100463733C CN B2007100253607 A CNB2007100253607 A CN B2007100253607A CN 200710025360 A CN200710025360 A CN 200710025360A CN 100463733 C CN100463733 C CN 100463733C
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Abstract
A titanium pipe processing method for the computer movable hard disk main shaft sleeve belongs to processing technology field of computer movable hard disk main shaft sleeve pipe; the present invention comprises the following steps that people select the perforated titanium round pipe according to the requirements of the finished titanium pipe specification; preprocess the perforated titanium round pipe; a plurality of cold rolling and hot treatment are implemented on the preprocessed perforated titanium round pipe to make the pipe a titanium round pipe of a thin wall; the finished titanium pipe for computer movable hard disk main shaft sleeve is obtained after the cold rolling and the heat treatment for finished product are implemented on the perforated titanium round pipe. The yield rate in the process of perforated titanium round pipe to the titanium pipe finished product used for the computer movable disk main shaft sleeve is more than 89 percent and the finished product qualification rate is more than 97 percent; the finished product boasts of ideal physical function (expansion rate is 25 to 45 percent), tensile strength (MPa) which is 440 to 620 and melting point which is 1668 Celsius degrees; the function will not change even with a low temperature of minus 253 Celsius degrees and the abrasion and corrosion resistance is excellent; in addition, the method boasts of simple steps and the necessary equipment is normal; in this way, this method can meet the industrial production requirements.
Description
Technical field
The invention belongs to used for computer mobile hard disk main shaft sleeve tubing processing technique field, more particularly relate to the processing method of titanium pipe used for computer mobile hard disk main shaft sleeve.
Background technology
The technology that is processed into computer mobile hard disk main shaft sleeve with glass or pottery or stainless steel is ripe already, and widely be applied on the computer mobile hard disk for a long time by the main shaft sleeve that this material makes, but development along with technology, improving constantly of computer work speed, requirement to main shaft sleeve is also all high with day, alleged here requirement be industry known such as intensity, toughness, antivibration, light specific gravity, wear-resisting etc.Though glass, pottery have the high strong point of intensity, poor toughness, vibration resistance are undesirable easily cracked, be difficult to service life ensure, and processability are poor, and product qualified rate is low; Though the strong point of stainless steel flexible and machinability, material than great and wear no resistance and perishable be its weakness.In view of above-mentioned different materials because of separately character, physical property is different described strong point can not be got both, therefore people are exploring new material always and are coming instead of glass, pottery, stainless steel, use the purpose that reaches more suitable, more durable, for example can satisfy portable hard drive rotating speed 7200n/min even more high-revolving job requirement at least.
Owing to having little, wear-resistant, corrosion-resistant, high temperature resistant etc. the excellent specific property of known good toughness, proportion, titanium metal material is described as the space metal, these excellent specific properties can remedy the drawback of the computer mobile hard disk main shaft sleeve of being made by glass, pottery, stainless steel material just comprehensively, so industry is locked in sight this material naturally.
At present, processing to titanium pipe used for computer mobile hard disk main shaft sleeve is titanium rod (cylindrical) directly to be put to the turning of metalworking technology obtain, yet facts have proved that this processing method is inadvisable, because in the process that is machined to the degree that is satisfied main shaft sleeve usefulness tubing from the titanium rod, spillage of material is huge, often to realize, thereby cause the price obstacle to practical application with the material that sacrifice is several times as much as finished product tubing itself.Again, although the at present existing very few enterprise of China particularly enterprise such as steel plant such as Chinese Shanghai iron and steel five factories has grasped perforation to the titanium pole, when in heating furnace, the titanium pole being heated to 940 ℃ of left and right sides, on punch, bore a hole with pure molybdenum plug, obtain the perforated titanium pipe, the loss that more aforesaid Cutting Process can economical with materials.But because the special characteristics of titanium material, subsequent technique is difficult to be supportted control by people, and for example roll compacting and process of thermal treatment key element are often at a loss as to what to do, yet these technical factors ensure the key of product quality and qualification rate exactly.At present computer mobile hard disk main shaft sleeve adopts the titanium pipe why only to stay in the experimental applications stage and can't enter the overall application of industrialization, exactly because restricted by above-mentioned technological factor, production firm as computer product or computer fittings does not objectively possess the ability of processing mobile hard disk main shaft sleeve with tubing in addition, has therefore proposed the problem of technological challenge to the manufacturer of the extraordinary tubing of professional production.
Summary of the invention
Task of the present invention is the processing method that a kind of titanium pipe used for computer mobile hard disk main shaft sleeve will be provided, and this method spillage of material is little, technical process is terse and can satisfy the industrialization production requirement.
Task of the present invention is finished like this, a kind of processing method of titanium pipe used for computer mobile hard disk main shaft sleeve, and it may further comprise the steps:
A) choose the perforated titanium pole by the specification requirement of finished product titanium pipe;
B) the perforated titanium pipe is done preliminary treatment;
C) pretreated perforated titanium pipe is carried out multiple tracks is cold rolling, multiple tracks heat treatment, thin-walled titanium pipe;
D) it is cold rolling thin-walled titanium pipe to be carried out finished product, carry out finished product heat treatment again, obtain used for computer mobile hard disk main shaft sleeve finished product titanium pipe, wherein: described preliminary treatment is reconditioning, described reconditioning is for removing in the perforated titanium pipe, on the outer wall by blind crack that piercing process produced, described multiple tracks to the perforated titanium pipe is cold rolling, multiple tracks heat treatment hockets each other, described cold rolling compression ratio is＜70%, percentage elongation＜3 times, described compression ratio is the ratio of perforated titanium pipe at the sectional area of rolling front and back, described multiple tracks to the perforated titanium pipe is cold rolling to comprise at least the first, second, cold rolling for the third time, described multiple tracks heat treatment comprises at least the first, second, intermediate heat-treatment for the third time; Described alternately being meant after cold rolling in the middle of the first time made intermediate heat-treatment for the first time, cold rolling in the middle of doing for the second time after the intermediate heat-treatment first time, intermediate heat-treatment is for the second time made in cold rolling back in the middle of for the second time, and then it is cold rolling in the middle of doing for the third time after the intermediate heat-treatment second time, make intermediate heat-treatment for the third time after cold rolling in the middle of for the third time, the cold rolling compression ratio of described finished product is＜70%, percentage elongation is＜3 times, described compression ratio is the ratio of sectional area of the thin-walled titanium pipe of cold rolling front and back, and when finished product is cold rolling, in the pore of thin-walled titanium pipe, inject lubricant, lubricant is a chlorinated paraffin wax, described finished product heat treatment is vacuum heat, described vacuum heat is vacuum annealing, and vacuum annealing temperature is 650-670 ℃, vacuum is 1 * 10
-2MPa, temperature retention time are 120-150min.
In another embodiment of the present invention, in the hole of perforated titanium pipe, inject the lubricant that is used to improve the hole wall slickness when cold rolling respectively in described first, second, third centre.
In yet another embodiment of the present invention, described lubricant is a chlorinated paraffin wax.
In of the present invention and then embodiment, described first, second, third intermediate heat-treatment is vacuum annealing, and described vacuum annealing temperature is that 670-690 ℃, vacuum are 1 * 10
-2MPa, temperature retention time are 120-150min.
The inventive method is owing to adopted, multiple tracks heat treatment cold rolling to the multiple tracks of perforated titanium pipe and finished product is cold rolling, finished product heat treatment, therefore the lumber recovery in the overall process to the titanium pipe used for computer mobile hard disk main shaft sleeve finished product from the perforated titanium pipe reaches more than 89%, and product qualified rate reaches more than 97%; Compare with glass, pottery, stainless steel in the prior art, has desirable physical property, as toughness (percentage elongation 25-45%), tensile strength (MPa) 440-620,1668 ℃ of fusing points, low temperature resistant-253 ℃ of constant, wear-resistant and corrosion-resistant degree excellences of performance; Method step is simple, and the equipment that is relied on is not harsh, can satisfy the suitability for industrialized production requirement.
The specific embodiment
Embodiment 1:
Think that Shanghai Sen Song Co., Ltd (enterprise that day Benson pine Industrial Co., Ltd sets up in China) processing specification is that the titanium pipe used for computer mobile hard disk main shaft sleeve of external diameter 24.5mm, wall thickness 2.6mm is an example.
A) choose the perforated titanium pipe by the specification requirement of finished product titanium pipe, specifically: buying specification from Chinese Shanghai iron and steel five factories is that external diameter 88mm, wall thickness 8mm, length are the perforated titanium pole of 95cm, and the applicant claims that also this perforated titanium pole is a material base;
B) to by steps A) resulting perforated titanium pipe carries out preliminary treatment, it is reconditioning, also claim repaired biscuit, why to carry out reconditioning, this is because the titanium material has the characteristic that absorbs oxygen and nitrogen when being heated to more than 450 ℃, pole is after hot piercing, on the outer wall of perforated titanium pole, be formed with trickle crackle and oxide layer owing to the intrusion of these two kinds of gases, simultaneously because the unavoidable residual defectiveness of titanium pole itself, in perforation procedure, not only can not eliminate, and can extend on the contrary, therefore need handle endoporus with boring cutter by outer surface reconditioning and lathe, to the inwall cutting, cutting output is controlled at about 0.3mm, makes blind crack with cutting element (cutter), residual flaw is in the perforated titanium pipe, remove on the outer wall;
C) to via step B) to do three centres cold rolling for perforated titanium pipe after the reconditioning, three intermediate heat-treatment, here the cold rolling implication in alleged centre is meant in product processing promptly cold rolling before obtaining thin-walled titanium pipe, it is cold rolling that industry also is called process, the implication of intermediate heat-treatment in like manner, during three times the centre is cold rolling first, second, the cold rolling two-roll cold rolling mill that all adopts for the third time, specific as follows: cold rolling for the first time, be equipped with the internal mold of 55mm and the external mold of 68mm, by the steel rolling row generally use but be not limited to as producing by Zhangjagang City, Jiangsu Province, China constant force machinery Co., Ltd, the model of selling is that the LG60 two-roll cold rolling mill is cold rolling, when cold rolling, in the endoporus of perforated titanium pole, inject chlorinated paraffin wax or be similar to other lubricant of chlorinated paraffin wax effect, bright and clean exquisitely carved to ensure the endoporus hole wall, the compression ratio of the sectional area of the titanium pole after rolling before control is rolled is 37.5%, percentage elongation is 1.6 times, after this (for the first time promptly) is cold rolling, can also be according to requiring the titanium pole is deoiled and even pickling and shaping, obtain external diameter 68mm, the titanium pipe of wall thickness 6.5mm, then make vacuum annealing for the first time, 690 ℃ of annealing temperatures with vacuum drying oven, vacuum is 1 * 10
-2MPa, temperature retention time are 145min, to be cooled carrying out to the natural temperature cold rolling (claiming that also pony-roughing pass is cold rolling) in the middle of the second time, with 35mm internal mold, 45mm external mold, by aforesaid rate is 2 times, in endoporus, inject chlorinated paraffin wax when cold rolling equally, after this is cold rolling, can deoil, pickling, aligning, bore hole the titanium pipe, do vacuum annealing for the second time (also claiming pony-roughing pass annealing) with vacuum drying oven then, 680 ℃ of annealing temperatures, vacuum are 1 * 10
-2MPa, temperature retention time is 130min, to be cooled to natural temperature, can carry out shaping, the defective that might stay when cold rolling to remove, obtain external diameter 45mm, the titanium pipe of wall thickness 4.65mm, thereafter use the 20.3mm internal mold, 27.5mm external mold, preferred but cold-rolling mill that be not limited to adopts as Zhangjagang City, Jiangsu Province, China constant force machinery Co., Ltd to be produced, the model of selling is cold rolling in the middle of LG30 type cold-rolling mill is done for the third time, compression ratio is 57%, percentage elongation is 2.2 times, in endoporus, inject chlorinated paraffin wax when cold rolling, deoiling after rolling, pickling, do vacuum annealing for the third time after the shaping, 675 ℃ of annealing temperatures, vacuum is 1 * 10
-2MPa, temperature retention time 125min obtain the thin-walled titanium pipe of external diameter 27.5mm, wall thickness 3.6mm;
D) to by step C) to carry out finished product cold rolling for resulting thin-walled titanium pipe, specifically be to use the internal mold of 19.3mm and the external mold of 24.5mm, when cold rolling, in the pore of thin-walled titanium pipe, inject chlorinated paraffin wax, cold-rolling mill preferably adopts Zhangjagang City, Jiangsu Province, China constant force machinery Co., Ltd to produce, the model of selling is LD30 three roller finishing mills, control compression ratio 33.7%, 1.51 times of percentage elongation, obtain external diameter 24.5mm, the production tube of wall thickness 2.6mm, after degreasing (cleaning), be put to finished product heat treatment again, specifically be to adopt vacuum annealing, the vacuum drying oven temperature is 665 ℃, vacuum is 1 * 10
-2MPa, temperature retention time are 130min, and after the cooling, visual concrete condition is aligned, test example is as flaw detection, and cuts off, packs according to the required length scaling of user.
By the resulting specification of present embodiment be: the titanium pipe used for computer mobile hard disk main shaft sleeve of external diameter 24.5mm, wall thickness 2.6mm send national non-ferrous metal quality supervision and test center to detect with trade mark TA2, all technical indicators are all qualified, as percentage elongation be 36%, tensile strength (MPa) 470,1668 ℃ of fusing points, low temperature resistant-253 ℃ of performances is constant, can remedy with glass, pottery, stainless steel comprehensively and make the existing deficiency of axle sleeve.And lumber recovery reaches 90%, and product qualified rate reaches 97.8%.
Embodiment 2:
Think that Shanghai Sen Song Co., Ltd (enterprise that day Benson pine Industrial Co., Ltd sets up in China) processing specification is that the titanium pipe used for computer mobile hard disk main shaft sleeve of external diameter 15.1mm, wall thickness 1.9mm is an example.
A) choose the perforated titanium pipe by the specification requirement of finished product titanium pipe, specifically: buying specification from Chinese Shanghai iron and steel five factories is that external diameter 88mm, wall thickness 8mm, length are the perforated titanium pole of 95cm, and the applicant claims that also this perforated titanium pole is a material base;
B) to by steps A) resulting perforated titanium pipe carries out preliminary treatment, it is reconditioning, also claim repaired biscuit, why to carry out reconditioning, this is because the titanium material has the characteristic that absorbs oxygen and nitrogen when being heated to more than 450 ℃, pole is after hot piercing, on the outer wall of perforated titanium pole, be formed with trickle crackle and oxide layer owing to the intrusion of these two kinds of gases, simultaneously because the unavoidable residual defectiveness of titanium pole itself, in perforation procedure, not only can not eliminate, and can extend on the contrary, therefore need handle endoporus with boring cutter by outer surface reconditioning and lathe, to the inwall cutting, cutting output is controlled at about 0.3mm, makes blind crack with cutting element (cutter), residual flaw is in the perforated titanium pipe, remove on the outer wall;
C) to via step B) to do four centres cold rolling for perforated titanium pipe after the reconditioning, four intermediate heat-treatment, here the cold rolling implication in alleged centre is meant in product processing promptly cold rolling before obtaining thin-walled titanium pipe, it is cold rolling that industry also is called process, the implication of intermediate heat-treatment in like manner, during five times the centre is cold rolling first, second, the cold rolling two-roll cold rolling mill that all adopts for the third time, back secondary adopts three cold mills, specific as follows: cold rolling for the first time, be equipped with the internal mold of 55mm and the external mold of 68mm, by the steel rolling row generally use but be not limited to as producing by Zhangjagang City, Jiangsu Province, China constant force machinery Co., Ltd, the model of selling is that the LG60 two-roll cold rolling mill is cold rolling, when cold rolling, in the endoporus of perforated titanium pole, inject chlorinated paraffin wax or be similar to other lubricant of chlorinated paraffin wax effect, bright and clean exquisitely carved to ensure the endoporus hole wall, the compression ratio of the sectional area of the titanium pole after rolling before control is rolled is 37.5%, percentage elongation is 1.6 times, after this (for the first time promptly) is cold rolling, can also be according to requiring the titanium pole is deoiled and even pickling and shaping, obtain external diameter 68mm, the titanium pipe of wall thickness 6.5mm, then make vacuum annealing for the first time, 690 ℃ of annealing temperatures with vacuum drying oven, vacuum is 1 * 10
-2MPa, temperature retention time are 145min, to be cooled carrying out to the natural temperature cold rolling (claiming that also pony-roughing pass is cold rolling) in the middle of the second time, with 36mm internal mold, 45mm external mold, undertaken cold rolling by aforesaid and for the first time middle cold rolling identical two rollers, 60 type cold-rolling mills, compression ratio is 54%, percentage elongation is 2.19 times, in endoporus, inject chlorinated paraffin wax when cold rolling equally, after this is cold rolling, can deoil to the titanium pipe, pickling, aligning, bore hole, do vacuum annealing for the second time (also claiming pony-roughing pass annealing) with vacuum drying oven then, 685 ℃ of annealing temperatures, vacuum are 1 * 10
-2MPa, temperature retention time is 135min, to be cooled to natural temperature, can carry out shaping, the defective that might stay when cold rolling to remove, obtain external diameter 45mm, the titanium pipe of wall thickness 4.65mm, thereafter use the 18mm internal mold, the 25mm external mold, preferred but cold-rolling mill that be not limited to adopts as Zhangjagang City, Jiangsu Province, China constant force machinery Co., Ltd to be produced, the model of selling is cold rolling in the middle of LG30 type cold-rolling mill is done for the third time, compression ratio is 58.7%, percentage elongation is 2.4 times, in endoporus, inject chlorinated paraffin wax when cold rolling, deoiling after rolling, pickling, do vacuum annealing for the third time after the shaping, 687 ℃ of annealing temperatures, vacuum is 1 * 10
-2MPa, temperature retention time are 120min, obtain the titanium pipe of external diameter 25mm, wall thickness 3.5mm; Adopt the 4th intermediate rolling of LD30 three cold mills, use the external mold of 21mm, the internal mold of 15.4mm, be rolled, compression ratio is 32%, and percentage elongation is 1.47 times, inject chlorinated paraffin wax to endoporus when cold rolling, after rolling, the titanium pipe is deoiled pickling, obtaining external diameter after the shaping is 21mm, wall thickness is the thin-walled titanium pipe of 2.8mm, carries out i.e. the 4th annealing of intermediate heat-treatment again, and annealing temperature is that 675 ℃, vacuum are 1 * 10
-2MPa, temperature retention time 120min;
D) to by step C) to carry out finished product cold rolling for resulting thin-walled titanium pipe, specifically be to use the external mold of 18mm and the internal mold of 13.4mm, cold-rolling mill selects for use Zhangjagang City, Jiangsu Province, China constant force machinery Co., Ltd to produce, the model of selling is that LD30 three roller finishing mills are rolling, deoil then, reconditioning, carry out tandem rolling then, it specifically is external mold with 15.1mm, 11.3 internal mold, rolling on the LD30 three-high mill, control overall compression ratio be 51.8%, 2.03 times of percentage elongation, obtaining external diameter is 15.1mm, and the production tube of wall thickness 1.9mm is put to finished product heat treatment again after degreasing (cleaning), specifically be to adopt vacuum annealing, the vacuum drying oven temperature is 655 ℃, vacuum is 1 * 10
-2MPa, temperature retention time are 145min, and after the cooling, visual concrete condition is aligned, test example is as flaw detection, and cuts off, packs according to the required length scaling of user.
By the resulting specification of present embodiment be: the titanium pipe used for computer mobile hard disk main shaft sleeve of external diameter 15.1mm, wall thickness 1.9mm send national non-ferrous metal quality supervision and test center to detect with trade mark TA2, all technical indicators are all qualified, as percentage elongation be 39%, tensile strength (MPa) 460,1668 ℃ of fusing points, low temperature resistant-253 ℃ of performances is constant, can remedy with glass, pottery, stainless steel comprehensively and make the existing deficiency of axle sleeve.And lumber recovery reaches 90.5%, and product qualified rate reaches 98.2%.
Claims (4)
1. the processing method of a titanium pipe used for computer mobile hard disk main shaft sleeve is characterized in that it may further comprise the steps:
A) choose the perforated titanium pole by the specification requirement of finished product titanium pipe;
B) the perforated titanium pole is done preliminary treatment;
C) pretreated perforated titanium pole is carried out multiple tracks is cold rolling, multiple tracks heat treatment, thin-walled titanium pipe;
D) it is cold rolling thin-walled titanium pipe to be carried out finished product, carry out finished product heat treatment again, obtain used for computer mobile hard disk main shaft sleeve finished product titanium pipe, wherein: described preliminary treatment is reconditioning, described reconditioning is for removing in the perforated titanium pipe, on the outer wall by blind crack that piercing process produced, described multiple tracks to the perforated titanium pipe is cold rolling, multiple tracks heat treatment hockets each other, described cold rolling compression ratio is＜70%, percentage elongation＜3 times, described compression ratio is the ratio of perforated titanium pipe at the sectional area of rolling front and back, described multiple tracks to the perforated titanium pipe is cold rolling to comprise at least the first, second, cold rolling for the third time, described multiple tracks heat treatment comprises at least the first, second, intermediate heat-treatment for the third time; Described alternately being meant after cold rolling in the middle of the first time made intermediate heat-treatment for the first time, cold rolling in the middle of doing for the second time after the intermediate heat-treatment first time, intermediate heat-treatment is for the second time made in cold rolling back in the middle of for the second time, and then it is cold rolling in the middle of doing for the third time after the intermediate heat-treatment second time, make intermediate heat-treatment for the third time after cold rolling in the middle of for the third time, the cold rolling compression ratio of described finished product is＜70%, percentage elongation is＜3 times, described compression ratio is the ratio of sectional area of the thin-walled titanium pipe of cold rolling front and back, and when finished product is cold rolling, in the pore of thin-walled titanium pipe, inject lubricant, lubricant is a chlorinated paraffin wax, described finished product heat treatment is vacuum heat, described vacuum heat is vacuum annealing, and vacuum annealing temperature is 650-670 ℃, vacuum is 1 * 10
-2MPa, temperature retention time are 120-150min.
2. the processing method of titanium pipe used for computer mobile hard disk main shaft sleeve according to claim 1 is characterized in that in described first, second, third centre injecting respectively when cold rolling the lubricant that is used to improve the hole wall slickness in the hole of perforated titanium pipe.
3. the processing method of titanium pipe used for computer mobile hard disk main shaft sleeve according to claim 2 is characterized in that described lubricant is a chlorinated paraffin wax.
4. the processing method of titanium pipe used for computer mobile hard disk main shaft sleeve according to claim 1 is characterized in that described first, second, third intermediate heat-treatment is vacuum annealing, and described vacuum annealing temperature is that 670-690 ℃, vacuum are 1 * 10
-2MPa, temperature retention time are 120-150min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100253607A CN100463733C (en) | 2007-07-26 | 2007-07-26 | Method for processing titanium pipe used for computer mobile hard disk main shaft sleeve |
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| CNB2007100253607A CN100463733C (en) | 2007-07-26 | 2007-07-26 | Method for processing titanium pipe used for computer mobile hard disk main shaft sleeve |
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| CN100463733C true CN100463733C (en) | 2009-02-25 |
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| CN108642323A (en) * | 2018-06-29 | 2018-10-12 | 苏州市金翔钛设备有限公司 | A kind of processing method of titanium tube of thin wall |
| CN108842098B (en) * | 2018-07-06 | 2020-12-11 | 金华馨菲科技有限公司 | Processing technology of titanium alloy pipe |
Citations (3)
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|---|---|---|---|---|
| CN1390678A (en) * | 2002-07-24 | 2003-01-15 | 江苏兴荣高新科技股份有限公司 | Warm machining method for making titanium or Ti-alloy pipe |
| JP2006009057A (en) * | 2004-06-23 | 2006-01-12 | Nisshin Steel Co Ltd | Method for producing high strength cold-rolled steel sheet excellent in bending and fatigue resistant characteristics |
| CN1947877A (en) * | 2006-11-03 | 2007-04-18 | 西北有色金属研究院 | Super thin wall type titanium tube mfg. method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1390678A (en) * | 2002-07-24 | 2003-01-15 | 江苏兴荣高新科技股份有限公司 | Warm machining method for making titanium or Ti-alloy pipe |
| JP2006009057A (en) * | 2004-06-23 | 2006-01-12 | Nisshin Steel Co Ltd | Method for producing high strength cold-rolled steel sheet excellent in bending and fatigue resistant characteristics |
| CN1947877A (en) * | 2006-11-03 | 2007-04-18 | 西北有色金属研究院 | Super thin wall type titanium tube mfg. method |
Non-Patent Citations (2)
| Title |
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| 钛制计算机硬盘. 高敬，宁兴龙.钛工业进展，第1期. 2001 |
| 钛制计算机硬盘. 高敬，宁兴龙. 钛工业进展，第1期. 2001 * |
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Owner name: CHANGSHU CITY ZHONGTAI SCIENCE CO., LTD. Free format text: FORMER OWNER: CHANGSHU CITY XUAN LI PRECISION STEEL TUBE CO., LTD. Effective date: 20090710 |
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Effective date of registration: 20090710 Address after: Changshou City Mei Li Zhen Zhen door Patentee after: Changshu Sino-titanium Science and Technology Co., Ltd. Address before: Jiangsu province Changshou City Mei Li Zhen Zhen door Patentee before: Changshu Xuanli Precision Stell Tube Co., Ltd. |
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