CN103659280A - Method for preparing high-accuracy titanium and titanium alloy bars - Google Patents
Method for preparing high-accuracy titanium and titanium alloy bars Download PDFInfo
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- CN103659280A CN103659280A CN201310750205.7A CN201310750205A CN103659280A CN 103659280 A CN103659280 A CN 103659280A CN 201310750205 A CN201310750205 A CN 201310750205A CN 103659280 A CN103659280 A CN 103659280A
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- titanium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
Abstract
The invention provides a method for preparing high-accuracy titanium and titanium alloy bars. The method comprises the steps of preparing a blank, blanking, cogging and forging, performing deformation processing, annealing, hot straightening, turning, finishing, and inspecting a finished product and packing. According to the method, the bars are turned before finishing treatment, the diameter of the bars can be directly processed into the size of finished bars, sweeps generated by turning the bars can be recycled, and the economic value is high; the heating temperature is low during finishing treatment, metallographic structures of the bars are influenced a little and nearly not changed, the service life of the bars is prolonged, and the mechanical strength of the bars is enhanced; meanwhile, because the heating temperature is low during finishing treatment, oxide skins on the surfaces of the bars are very thin, the indentations of the integral bars are small in the straightening process, the bars are not required to be ground after straightening, directly enters a polishing machine and are polished twice to meet the requirements of the finished bars on roughness 1.6[mu]m and size tolerance.
Description
Technical field
The invention belongs to metal material processing technical field, be specifically related to the preparation method of a kind of high precision titanium and titanium alloy rod bar.
Background technology
The preparation method of existing medical titanium alloy bar, the general destressing aligning method that adopts when finishing is processed, when before finishing is processed, turning is processed, bar minimum need be stayed the surplus of 30-40 silk, and bar temp is higher while adopting the method heating, common pure titanium bar need be heated to 550-600 ℃, titanium alloy rod bar need be heated to 650-700 degree, under such hot conditions, the oxide skin of Surface of Rod Bar is thicker, the whole deliquescing of material, during aligning, the whole impression of bar is darker, minimum of a value also can reach 10 and only depend on polishing can not eliminate these unfavorable factors, therefore must could eliminate these unfavorable factors by grinding, Mo cuts processing roughness and reaches 6.4um, must also to carry out twice polishing and just can reach the requirement of finished product bar, and and Mo cut processing time-consuming, the abrasive dust producing is together with sand grains doping, recovery value is lower, therefore be necessary to improve.
Summary of the invention
The technical problem that the present invention solves: the preparation method that a kind of high precision titanium and titanium alloy rod bar are provided, after finishing is processed, without grinding, directly enter polishing machine and carry out roughness 1.6um and the size tolerance requirements that twice polishing can reach the requirement of finished product bar.
The technical solution used in the present invention: the preparation method of high precision titanium and titanium alloy rod bar, comprises following step:
1) blank is prepared, and selects and meets the titanium of GB/T13810-2007 standard-required or titanium alloy ingot as blank:
2) cogging is forged, pure titanium blank is put into resistance furnace and be heated to 950-1050 ℃ or titanium alloy blank is put into resistance furnace be heated to 1000-1200 ℃, be incubated D/2+30 to 50 minute, with hammering equipment, make pure titanium blank or titanium alloy blank deformation rate reach 50-65% and obtain pure titanium billet or titanium alloy billet;
3) pure titanium billet or titanium alloy billet are cut into little pure titanium billet or the little titanium alloy billet that finished product bar needs weight;
4) deformation processing, little pure titanium billet is put into resistance furnace again and be heated to 850-1000 ℃ or little titanium alloy billet is put into resistance furnace be again heated to 1000-1150 ℃, be incubated D/2+30 to 50 minute, with hammering equipment, make little pure titanium billet or little titanium alloy billet deformation rate reach 50-65% and make pure titanium rod material or titanium alloy rod bar;
5) annealing in process, puts into heating furnace by pure titanium rod material and is heated to 650-700 ℃ or titanium alloy rod bar is put into heating furnace be heated to 800-850 ℃, is incubated D/2+30 to 50 minute;
6) thermal straightening, is used 6 rollers or the thick straightener of 10 rollers to carry out thermal straightening air cooling pure titanium rod material or titanium alloy rod bar after insulation;
7) the pure titanium rod material after air cooling or titanium alloy rod bar are arrived to finished product bar size with Centreless lathe turning;
8) finishing is processed, pure titanium rod material after turning is put into cabinet-type electric furnace and be heated to 300-400 ℃ or the titanium alloy rod bar after turning is put into cabinet-type electric furnace be heated to 500-550 ℃, after taking-up, put into 10 rollers essences straighteners and align, then directly enter polishing machine and carry out twice polishing and can reach the requirement of finished product bar.
Wherein, in above-mentioned steps 2 and step 3, described hammering equipment is hydraulic press, pneumatic hammer or electric liquid hammer.
Preferably, in above-mentioned steps 2, pure titanium blank is put into resistance furnace and be heated to 980-1000 ℃ or titanium alloy blank is put into resistance furnace be heated to 1050-1150 ℃, be incubated D/2+30 to 50 minute, with hammering equipment, make pure titanium blank or titanium alloy blank deformation rate reach 56-60%.
Preferably, in above-mentioned steps 4, little pure titanium billet is put into resistance furnace again and be heated to 900-950 ℃ or little titanium alloy billet is put into resistance furnace be again heated to 1000-1050 ℃.
Preferably, in above-mentioned steps 8, the pure titanium rod material after turning is put into cabinet-type electric furnace and be heated to 300-400 ℃ or the titanium alloy rod bar after turning is put into cabinet-type electric furnace be heated to 500-550 ℃.
The present invention's advantage compared with prior art:
1, before finishing processing, bar is carried out to turning and add man-hour, diameter of rod can be machined directly to finished product bar size, the scrap producing during turning bar can be recycled again, and economic worth is very high;
When 2, finishing is processed, heating-up temperature is lower, little on the metallographic structure impact of bar, does not almost change, and has extended the service life of bar, has increased the mechanical strength of bar;
When 3, finishing is processed because heating-up temperature is lower, the oxide skin of Surface of Rod Bar as thin as a wafer, during aligning, the impression of bar integral body is less, does not need grinding and directly enter polishing machine to carry out twice polishing and can reach finished product bar to roughness 1.6um and size tolerance requirements after aligning;
4, save grinding operation one, save human and material resources and financial resources.
The specific embodiment
Embodiment 1: below in conjunction with the diameter of rod grade of tolerance between h7-h8, diameter is 9.5mm, the preparation process of the high precision titanium bar that length is 3m, is described in further detail the specific embodiment.
First, selecting diameter is 360mm, the pure titanium blank that length is 1.7m, and the part that has defect is determined in excision after ultrasonic examination, secondly, pure titanium blank is put into resistance furnace and be heated to 980 ℃, constant temperature insulation (is calculated according to formula for 3.5 hours for D/2+30 to 50 minute, wherein D is titanium ingot or titanium alloy ingot diameter, unit is mm), select hydraulic press, a kind of in pneumatic hammer or electric liquid hammer, make pure titanium blank deformation rate reach 55%, it is the pure titanium billet of 190mm that pure titanium blank forging is become to square opening, the blemish such as burr and crackle are removed in polishing, then weight/the specification needing according to finished product bar is cut off pure titanium billet to become little pure titanium billet, the 4th step, little pure titanium billet is put into resistance furnace and be heated to 950 ℃, be incubated 2 hours 0 10 minutes (according to formula, calculating), select hydraulic press, a kind of in pneumatic hammer or electric liquid hammer makes little pure titanium billet deformation rate reach 60%, little pure titanium billet is forged into the pure titanium rod material that diameter is 60mm, the 5th step, on inspection, dehiscence part the reconditioning face crack of excision pure titanium rod material, again pure titanium rod material being done to recrystallization annealing processes, annealing temperature is 680 ℃, temperature retention time is 40 minutes (70 minutes, according to formula, calculate), the 6th step, to the pure titanium rod material after annealing in process, adopts 6 rollers or the thick straightener of 10 rollers to carry out thermal straightening, eliminates camber distortion air cooling that pure titanium rod material is larger, the 7th step, arrives finished product bar size by the pure titanium rod material after air cooling with 16 types or 30 type Centreless lathe turning, only need stay the surplus of 0.05mm left and right, the 8th step, pure titanium rod material after turning is put into cabinet-type electric furnace and be heated to 350 ℃, after taking-up, put into 10 roller essence straightener alignings, because pure titanium rod material temperature only has 350 ℃ when finishing is processed, the oxide skin producing on pure titanium rod material surface is very thin, and when aligning pure titanium rod material integral body impression very shallow, only has 0.005-0.01mm, so do not need pure titanium rod material to carry out again grinding, directly enter polishing machine and carry out twice polishing and can reach finished product bar to roughness 1.6um and size tolerance requirements.Finally adopt laser diameter measuring instrument to carry out external diameter detection to finished product bar, and its chemical composition, physical property and crystalline phase tissue are tested by standard-required, through after the assay was approved, pack delivery.
Embodiment 2: below in conjunction with the diameter of rod grade of tolerance between h9-h10, diameter is 9.5mm, the preparation process of the high precision titanium alloy bar material that length is 3m, is described in further detail the specific embodiment.
First, selecting diameter is 360mm, the titanium alloy blank that length is 1.7m, and the part that has defect is determined in excision after ultrasonic examination, secondly, titanium alloy blank is put into resistance furnace and be heated to 1100 ℃, heated at constant temperature insulation (calculates according to formula for 3.5 hours for D/2+30 to 50 minute, wherein D is titanium ingot or titanium alloy ingot diameter, unit is mm), select hydraulic press, a kind of in pneumatic hammer or electric liquid hammer, make titanium alloy blank deformation rate reach 60%, titanium alloy blank is forged into the titanium alloy billet that square opening is 190mm, the blemish such as burr and crackle are removed in polishing, then weight/the specification needing according to finished product bar is cut off titanium alloy billet to become little titanium alloy billet, the 4th step, little titanium alloy billet is put into resistance furnace and be heated to 1020 ℃, be incubated 2 hours 0 10 minutes (according to formula, calculating), select hydraulic press, a kind of in pneumatic hammer or electric liquid hammer makes little titanium alloy billet deformation rate reach 62%, little titanium alloy billet is forged into the titanium alloy rod bar that diameter is 60mm, the 5th step, on inspection, dehiscence part the reconditioning face crack of excision titanium alloy rod bar, again titanium alloy rod bar being done to recrystallization annealing processes, annealing temperature is 830 ℃, temperature retention time is 40 minutes (70 minutes, according to formula, calculate), the 6th step, to the titanium alloy rod bar after annealing in process, adopts 6 rollers or the thick straightener of 10 rollers to carry out thermal straightening, eliminates camber distortion air cooling that titanium alloy rod bar is larger, the 7th step, arrives finished product bar size by the titanium alloy rod bar after air cooling with 16 types or 30 type Centreless lathe turning, only need stay the surplus of 0.05mm left and right, the 8th step, titanium alloy rod bar after turning is put into cabinet-type electric furnace and be heated to 520 ℃, after taking-up, put into 10 roller essence straightener alignings, because titanium alloy rod bar temperature only has 520 ℃ when finishing is processed, the oxide skin producing on titanium alloy rod bar surface is very thin, and the impression of titanium alloy rod bar integral body is very shallow, only has 0.005-0.01mm, so do not need titanium alloy rod bar to carry out grinding, directly enter polishing machine and carry out twice polishing and can reach finished product bar to smart rugosity 1.6um and size tolerance requirements.Finally adopt laser diameter measuring instrument to carry out external diameter detection to finished product bar, and its chemical composition, physical property and crystalline phase tissue are tested by standard-required, through after the assay was approved, pack delivery.
Above-described embodiment, is preferred embodiment of the present invention, is not used for limiting the scope of the present invention, and the equivalence of being done with content described in the claims in the present invention therefore all changes, within all should being included in the claims in the present invention scope.
Claims (5)
1. the preparation method of high precision titanium and titanium alloy rod bar, is characterized in that comprising following step:
1) blank is prepared, and selects and meets the titanium of GB/T13810-2007 standard-required or titanium alloy ingot as blank:
2) cogging is forged, pure titanium blank is put into resistance furnace and be heated to 950-1050 ℃ or titanium alloy blank is put into resistance furnace be heated to 1000-1200 ℃, be incubated D/2+30 to 50 minute, with hammering equipment, make pure titanium blank or titanium alloy blank deformation rate reach 50-65% and obtain pure titanium billet or titanium alloy billet;
3) pure titanium billet or titanium alloy billet are cut into little pure titanium billet or the little titanium alloy billet that finished product bar needs weight;
4) deformation processing, little pure titanium billet is put into resistance furnace again and be heated to 850-1000 ℃ or little titanium alloy billet is put into resistance furnace be again heated to 1000-1150 ℃, be incubated D/2+30 to 50 minute, with wire rod rolling equipment, make little pure titanium billet or little titanium alloy billet deformation rate reach 50-65% and make pure titanium rod material or titanium alloy rod bar;
5) annealing in process, puts into heating furnace by pure titanium rod material and is heated to 650-700 ℃ or titanium alloy rod bar is put into heating furnace be heated to 800-850 ℃, is incubated D/2+30 to 50 minute;
6) thermal straightening, is used 6 rollers or the first straightener of 10 rollers to carry out thermal straightening air cooling the pure titanium rod material after insulation or titanium alloy rod bar;
7) the pure titanium rod material after air cooling or titanium alloy rod bar are arrived to finished product bar size with Centreless lathe turning;
8) finishing is processed, pure titanium rod material after turning is put into cabinet-type electric furnace and be heated to 300-400 ℃ or the titanium alloy rod bar after turning is put into cabinet-type electric furnace be heated to 500-550 ℃, after taking-up, put into 10 rollers essences straighteners and carry out precision straightening and reach the requirement of 0.5/1000mm linearity, then directly enter polishing machine and carry out twice polishing and can reach the requirement of finished product bar.
2. the preparation method of high precision titanium according to claim 1 and titanium alloy rod bar, is characterized in that: in above-mentioned steps 2 and step 3, described hammering equipment is hydraulic press, pneumatic hammer or electric liquid hammer.
3. the preparation method of high precision titanium according to claim 1 and 2 and titanium alloy rod bar, it is characterized in that: in above-mentioned steps 2, pure titanium blank is put into resistance furnace and be heated to 980-1000 ℃ or titanium alloy blank is put into resistance furnace be heated to 1050-1150 ℃, be incubated D/2+30 to 50 minute, with hammering equipment, make pure titanium blank or titanium alloy blank deformation rate reach 56-60%.
4. the preparation method of high precision titanium according to claim 1 and 2 and titanium alloy rod bar, it is characterized in that: in above-mentioned steps 4, little pure titanium billet is put into resistance furnace again and be heated to 900-950 ℃ or little titanium alloy billet is put into resistance furnace be again heated to 1000-1050 ℃.
5. the preparation method of high precision titanium according to claim 1 and 2 and titanium alloy rod bar, it is characterized in that: in above-mentioned steps 8, the pure titanium rod material after turning is put into cabinet-type electric furnace and be heated to 300-400 ℃ or the titanium alloy rod bar after turning is put into cabinet-type electric furnace be heated to 500-550 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310750205.7A CN103659280A (en) | 2013-12-31 | 2013-12-31 | Method for preparing high-accuracy titanium and titanium alloy bars |
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| CN201310750205.7A CN103659280A (en) | 2013-12-31 | 2013-12-31 | Method for preparing high-accuracy titanium and titanium alloy bars |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104493433A (en) * | 2014-11-21 | 2015-04-08 | 青岛麦特瑞欧新材料技术有限公司 | Method for manufacturing high-accuracy pure titanium rod |
| CN104588974A (en) * | 2014-11-21 | 2015-05-06 | 青岛麦特瑞欧新材料技术有限公司 | Method for preparing high-precision titanium alloy bar |
| CN104866641A (en) * | 2014-12-10 | 2015-08-26 | 太原科技大学 | Model for predicting resilience of bar subjected to two roll straightening |
| CN106853535A (en) * | 2016-12-19 | 2017-06-16 | 西安欧中材料科技有限公司 | A kind of preparation method of high-quality γ TiAl spherical powders |
| CN111545995A (en) * | 2020-04-22 | 2020-08-18 | 西安圣泰金属材料有限公司 | Titanium alloy bar for minimally invasive pedicle screw and preparation method thereof |
-
2013
- 2013-12-31 CN CN201310750205.7A patent/CN103659280A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104493433A (en) * | 2014-11-21 | 2015-04-08 | 青岛麦特瑞欧新材料技术有限公司 | Method for manufacturing high-accuracy pure titanium rod |
| CN104588974A (en) * | 2014-11-21 | 2015-05-06 | 青岛麦特瑞欧新材料技术有限公司 | Method for preparing high-precision titanium alloy bar |
| CN104866641A (en) * | 2014-12-10 | 2015-08-26 | 太原科技大学 | Model for predicting resilience of bar subjected to two roll straightening |
| CN104866641B (en) * | 2014-12-10 | 2019-07-16 | 太原科技大学 | A kind of springback Prediction model of bar Two-roll straightening |
| CN106853535A (en) * | 2016-12-19 | 2017-06-16 | 西安欧中材料科技有限公司 | A kind of preparation method of high-quality γ TiAl spherical powders |
| CN111545995A (en) * | 2020-04-22 | 2020-08-18 | 西安圣泰金属材料有限公司 | Titanium alloy bar for minimally invasive pedicle screw and preparation method thereof |
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