CN100435985C - Hot rolling cogging process of Ti-Ni alloy ingot - Google Patents
Hot rolling cogging process of Ti-Ni alloy ingot Download PDFInfo
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- CN100435985C CN100435985C CNB2005100428956A CN200510042895A CN100435985C CN 100435985 C CN100435985 C CN 100435985C CN B2005100428956 A CNB2005100428956 A CN B2005100428956A CN 200510042895 A CN200510042895 A CN 200510042895A CN 100435985 C CN100435985 C CN 100435985C
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Abstract
The present invention relates to high efficiency and low power consumption hot rolling cogging process of Ti-Ni alloy ingot, and features that the technological process includes the steps of: heat treatment of the Ti-Ni alloy ingot, cogging and rolling Ti-Ni alloy rod. The heat treatment before cogging has temperature of 750-950 deg.c, and during the cogging, the deformation region of the Ti-Ni alloy ingot is applied with circumferential symmetrical rolling force and longitudinal continuous gradient rolling force. The rolling process has short period, great rolling deformation rate and high efficiency, and is suitable for industrial production, and the rolled Ti-Ni alloy rod has high sized precision and high finished product rate.
Description
Technical field
The present invention relates to a kind of hot rolling cogging processing method of low consumption efficiently of titanium nickel ingot casting.
Background technology
Ti-Ni alloy is a kind of novel multifunctional material, has peculiar shape memory, phase transformation super-elasticity and high damping characteristic, simultaneously, the intensity height, corrosion-proof wear is good, also has good biocompatibility.Ti-Ni alloy can be used as engineering material, smart material, medical material, has wide range of applications, and it is used and has spreaded all over every field such as electronics, machinery, aviation, the energy, transportation, building, household electrical appliances, health care and small stores.But Ti-Ni alloy belongs to inter-metallic compound material, and property is crisp and hard, the materials processing difficulty, and the performance of material alters a great deal because of the composition fine difference, causes the use amount of titanium nickel alloy material to be restricted.In order to guarantee the homogeneity of ingredients of Ti-Ni alloy ingot, the ingot shape of general Ti-Ni alloy ingot is all less.The hammer cogging technology is normally adopted in the cogging of small-sized Ti-Ni alloy ingot, less employing open-train mill rolling-cogging technology.These two kinds of cogging methods, material cogging lumber recovery is low, and cogging Disabled defect rate is up to about 20%.And during general flat-die forging, pass reduction is low, and efficient is low, causes the integrated cost height, involves great expense.
A kind of hot rolling cogging process of the present invention, realization is directly rolling to titanium nickel ingot casting, and the cracking problem of ingot blank when having avoided cogging has improved production efficiency and has manufactured a finished product rate.
Summary of the invention
The objective of the invention is, provide a kind of with Ti-Ni alloy ingot, directly hot rolling cogging is processed as the production method of efficient, the high finished product rate of bar.
Design of the present invention is, the force-bearing situation of titanium nickel ingot casting when improving cogging is avoided the impulsive force of hammer cogging, prevents to shear cracking; Control cogging processing speed prevents thermal stress-cracking; Increase split rolling method strength, improve the cogging working (machining) efficiency.The modulus of shearing of Ti-Ni alloy low (austenite 23Gpa, martensite 8Gpa), property is crisp and hard, and when flat-die forging, the deformed area of ingot casting is subjected to the bi-directional symmetrical compression of forging hammer up and down, and other direction is in does not have constraint tensile stress state.When forging force was big, titanium nickel ingot casting was easy to cause cruciate flower type cracking because of the shearing force of miter angle; When forging force was too small, titanium nickel ingot casting was difficult to forging molding greatly because of resistance of deformation.Therefore, during the flat-die forging of titanium nickel ingot casting, forging force is difficult to hold on the one hand, and the forging yield rate is low; The distortion of forging processing passage is little on the other hand, efficient is low.When adopting the open-train mill rolling-cogging, improved the stressed uniformity of ingot casting, still, the rolling strength of open-train mill is low, and when the ingot rolling heating-up temperature was hanged down, blank hardness was big, and the rolling deformation drag is big; When rolling heating-up temperature is high, be easy to rolling deformation, yet with respect to flat-die forging, the mill speed of milling train is very fast, distortion heat is big, and ingot casting center and appearance temperature difference are very big, and ingot casting is easy to cracking because of thermal stress.
A kind of hot rolling cogging process of Ti-Ni alloy ingot of the present invention is that graft application is in the cogging of Ti-Ni alloy ingot a kind of stepping rolling technique of suitable refractory metal material processing.This cogging method has been avoided the problem of above-mentioned forging and rolling-cogging, has concentrated and has forged and rolling advantage.
The specific embodiment
Adopt vacuum induction melting furnace, the Ti-Ni alloy ingot that founding is small-sized, ingot casting become the light ingot after lathe strips off the skin, and the light ingot after the heat treatment, adopts the direct split rolling method of stepping milling train to become bar in electric furnace.
In the stepping operation of rolling, the distortion of ingot casting is to be realized by the motion that is contained in the roll that has certain pass in the head.Rolling is that head and roll are moved reciprocatingly simultaneously by the drive of crank connecting link system respectively.When head moved (, idle stroke identical with the ingot blank bearing of trend) backward with roll, the pass that is made of roll changed from small to big, and roll leaves ingot blank, and when continuing to move to the back limit, the pass size opens up into maximum, and this moment, ingot blank began to send to and rotate.When head and roll travel forward (rolling stroke), the pass size from large to small, roll begins to beat simultaneously ingot blank, then along certain profile roll-in ingot blank, thereby realized the forging rolling distortion of ingot casting, and made one section of ingot blank formation and roll pass be out of shape awl accordingly; During limit, its pass size has become product size before head and roll move to, and just finished the whole rolling cycle this moment.
In stepping is rolling, the whole deformation process of ingot casting is to realize by long deformed area, and deformed region bears stronger compression, it circumferentially affords the symmetry rolling deformation force, it vertically affords continuity gradient rolling deformation force, so it can obtain bigger passage distortion, its lengthening coefficient reaches 4～6 (ε=75～84%) usually, reaches as high as (ε＞90%) more than 10.Ingot blank is except having preferably stress condition, its distortion still is interrupted, therefore, and in the interval (idle stroke) of distortion, the tissue of deformed region can obtain certain answer and softening, so this mode of texturing is well suited for the plastic working of difficult-to-deformation material.
Embodiment 1:
Adopt the 25kg vacuum induction melting furnace, 10
-1Under the condition of the above vacuum of Pa, it is the small-sized Ti-Ni alloy ingot of Ti-50.8at.%Ni that titanium sponge and electrolytic nickel are smelted into to nominal composition, melting electric current 90～110A, melting voltage 280～330V.Ingot casting is of a size of Φ 76 * 450mm, becomes Φ 68 * 450mm light ingot after stripping off the skin.
The heat treatment in electric furnace of light ingot is warming up to 850 with stove
± 10℃, insulation 30min..Follow on C Щ M-175 type stepping milling train, directly split rolling method.Main motor speed 150n/min., mill speed 600mm/min., rolling stride 10mm/ step; The breaking down temperature is about 840 ℃, and finishing temperature is about 700 ℃; The rolling deformation rate is 52%.
Rolling Ti-Ni alloy rod Φ 47
± 1* 940mm, there is the cup type of the 7～8mm hole of contracting at two ends, the no gross imperfection in surface.Inside metallographic is vertical lengthening deformation tissue.Roll excellent two ends even tissue unanimity, do not have the big situation of each part histological difference of conventional titanium alloy (as TC4).
Embodiment 2:
The preparation method of Ti-Ni alloy ingot is the same.Light ingot heat treatment in electric furnace of Φ 68 * 450mm is warming up to 950 with stove
± 10℃, insulation 40min..Then on C Щ M-175 type stepping milling train, carry out direct split rolling method.Main motor speed 120n/min., mill speed 480mm/min., rolling stride 10mm/ step; The breaking down temperature is about 930 ℃, and finishing temperature is about 700 ℃; The rolling deformation rate is 74%.
Rolling Ti-Ni alloy rod is Φ 35
± 1* 1740mm, its lengthening coefficient has reached 4.There is the cup type of the 12～15mm hole of contracting at two ends, but the no gross imperfection in surface.Inside metallographic is dynamic recovery recrystallized structure substantially, but vertically also has tangible lengthening deformation crystal grain.
Of the present invention for the rolling direct cogging method of the stepping of Ti-Ni alloy ingot, rolling process time is short, and the machining deformation rate is big, the efficient height.Simultaneously, rolling Ti-Ni alloy rod, appearance and size precision height, yield rate is also high.
Claims (2)
1, a kind of Ti-Ni alloy ingot hot rolling cogging processing method is characterized in that the technical process of this method is: Ti-Ni alloy ingot---heat treatment---split rolling method---Ti-Ni alloy bar; After small-sized Ti-Ni alloy ingot stripped off the skin, heat treatment in electric furnace rose to 850 ℃～950 ℃ with furnace temperature, insulation 30min～40min; Split rolling method adopts stepping rolling, main motor speed 120～150n/min, mill speed 480～600mm/min, rolling stride 10mm/ step; The breaking down temperature is 840 ℃～930 ℃, and finishing temperature is 700 ℃; The rolling deformation rate is 52%～74%;
2, the described a kind of hot rolling cogging process of claim 1 is characterized in that the deformed area of titanium nickel ingot casting when hot rolling cogging, and it circumferentially affords the symmetry rolling deformation force, and it vertically affords continuity gradient rolling deformation force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100428956A CN100435985C (en) | 2005-06-29 | 2005-06-29 | Hot rolling cogging process of Ti-Ni alloy ingot |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100428956A CN100435985C (en) | 2005-06-29 | 2005-06-29 | Hot rolling cogging process of Ti-Ni alloy ingot |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1887458A CN1887458A (en) | 2007-01-03 |
| CN100435985C true CN100435985C (en) | 2008-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100428956A Expired - Fee Related CN100435985C (en) | 2005-06-29 | 2005-06-29 | Hot rolling cogging process of Ti-Ni alloy ingot |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103212570B (en) * | 2013-03-22 | 2015-12-09 | 西安思维金属材料有限公司 | The semi-tandem rolling processing method of the large high piece-weight wire rod of the Ni-based marmem of titanium |
| CN110605353B (en) * | 2019-08-07 | 2021-02-19 | 江苏天工科技股份有限公司 | Efficient short-flow precision forging and cogging process for titanium and titanium alloy ingots |
| CN114672675B (en) * | 2022-03-29 | 2022-09-20 | 西北有色金属研究院 | Nickel-rich nickel-titanium alloy gear and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5825421A (en) * | 1981-08-05 | 1983-02-15 | Sumitomo Metal Ind Ltd | Manufacture of titanium alloy rolling material having satisfactory texture |
| JPS5825423A (en) * | 1981-08-05 | 1983-02-15 | Sumitomo Metal Ind Ltd | Manufacture of titanium alloy rolling material having satisfactory texture |
| CN1621547A (en) * | 2004-12-28 | 2005-06-01 | 西北有色金属研究院 | NiTi alloy cube textured base band and preparation method thereof |
-
2005
- 2005-06-29 CN CNB2005100428956A patent/CN100435985C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5825421A (en) * | 1981-08-05 | 1983-02-15 | Sumitomo Metal Ind Ltd | Manufacture of titanium alloy rolling material having satisfactory texture |
| JPS5825423A (en) * | 1981-08-05 | 1983-02-15 | Sumitomo Metal Ind Ltd | Manufacture of titanium alloy rolling material having satisfactory texture |
| CN1621547A (en) * | 2004-12-28 | 2005-06-01 | 西北有色金属研究院 | NiTi alloy cube textured base band and preparation method thereof |
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| CN1887458A (en) | 2007-01-03 |
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Application publication date: 20070103 Assignee: Xi'an Siwei Metal Material Co., Ltd. Assignor: Xi'an Saite Metal Material Development Co., Ltd. Contract record no.: 2013610000083 Denomination of invention: Hot rolling cogging process of Ti-Ni alloy ingot Granted publication date: 20081126 License type: Exclusive License Record date: 20130813 |
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