CN108326041A - A kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar - Google Patents
A kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar Download PDFInfo
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- CN108326041A CN108326041A CN201810172814.1A CN201810172814A CN108326041A CN 108326041 A CN108326041 A CN 108326041A CN 201810172814 A CN201810172814 A CN 201810172814A CN 108326041 A CN108326041 A CN 108326041A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 97
- 238000003801 milling Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 18
- 239000010959 steel Substances 0.000 title claims abstract description 18
- 238000005096 rolling process Methods 0.000 claims abstract description 62
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 230000008859 change Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 42
- 239000000463 material Substances 0.000 description 20
- 239000013078 crystal Substances 0.000 description 18
- 230000008569 process Effects 0.000 description 12
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005242 forging Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 208000002925 dental caries Diseases 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000037237 body shape Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010274 multidirectional forging Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Metal Rolling (AREA)
- Forging (AREA)
Abstract
A kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar of the present invention is related to technical field of mechanical processing, and in particular to a kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar includes the following steps：S1：It is 40 150mm to choose diameter dimension D, and length is the titanium alloy blank of 300 5000mm；S2：Above-mentioned titanium alloy blank is placed in heating furnace and is heated to 800 1120 DEG C；S3：Titanium alloy blank after heating is transported to from heating furnace in skew rolling mill deflector chute；S4：Feeding is carried out in the deflector chute of skew rolling mill, titanium alloy blank is sent into the deformed area between skew rolling mill entrance and exit, titanium alloy blank, which is moved in deformed area inside spin until deforming, to be terminated；S5：Above-mentioned S2 S4 steps are repeated, 28 screw rolling is carried out to titanium alloy blank and obtains TC18 titanium alloy entirety ultra fine grained steel bars；The beneficial effects of the invention are as follows：Deformed area is worn deeply greatly, and multi- pass rolling is reciprocally carried out.Continuous-stable local deformation, pressure turn round complex three-dimensional drastic deformation, can obtain ideal grain refining effect.
Description
Technical field
The present invention relates to technical fields of mechanical processing, and in particular to a kind of helical circle of large-scale titanium alloy ultra fine grained steel bar
The equidistant milling method of cone roller.
Background technology
Its equivalent strain usually should be greater than 6 when preparing nanometer materials using plastic deformation mode, traditional plastic processing side
Method is difficult to accomplish, using super large plastic deformation method（Severe Plastic Deformation, SPD) it can realize.It is modern
SPD starts from the big pressure of Bridgemen propositions and shear-deformable combination forming mode, and fast development starts from the 1970s
The mid-term former Soviet Union and western countries, Segal have developed Equal-channel Angular Pressing technology（Equal-Channel Angular
Pressing, ECAP）, indicate the arrival in the microstructure epoch of SPD researchs.Over nearly more than 10 year, thousands of achievements in research
It publishes.
It is universally recognized after 2006 to be defined about SPD：Block is set to generate super large strain but unobvious change block geometry
The metal forming process of the grain refining effect of high-angle boundary is presented in size, can obtain crystallite dimension in the micron-scale（100-
1000nm) and nanoscale (is less than 100nm）, all can be described as a nanometer SPD（Abbreviation nanoSPD）.Since nanoSPD materials have greatly
Measure the wide-angle Non-equilibrium Grain Boundary tissue containing high density dislocation and high internal stress so that material shows to be different from traditional coarse-grain material
The mechanical behavior and deformation mechanism of material.
Current existing processing technology scheme：Typical SPD methods have high pressure torsion (High Pressure Torsion,
HPT), equal channel angular extrusion deformation (equal channel angular press-ing, ECAP), accumulation ply rolling method
(Accumulative Roll Bonding, ARB), torsion squeeze（Twist Extrusion, TE）And multiway forging（Multi-
Directional Forging, MDF).
Wherein,（1）High pressure torsion deforms：The primary sample (block or powder) being placed in support slot applies the pressure of several GPa
The characteristics of power, and two anvils above and below relative rotation make sample that intensive shear occur and deforms and crystal grain thinning, high pressure torsion is workpiece
For plate-like, size is smaller, and diameter is generally 10-20 mm, and thickness is 0.2-0.5 mm.
（2）Miter angle extruding deforming：By the cross-section channel of two intersection certain angles in mold, by material by one end
To the other end squeeze out, the change in material movement direction is allowed to by bending angle to generate pure shear shear deformation, may be repeated this at
Type process, shear strain amount increase with rolling pass.
（3）Accumulate ply rolling method：By the double-deck stacking after original plate surface treated, after heating roller welding together, then from
Centre cut off send back to surface treatment after carry out next roller welding cycle again, for ensure roll after plank can be welded together, every time
Drafts must not be less than 50%, but need strong shear stress condition in ARB process, lubricant cannot be used, this is to rolling
The service life of roller is unfavorable.
（4）Torsion squeezes：Beygelzime etc. proposes the technique.The method be also by shear-deformable crystal grain thinning at
Column blank is pressed through torsion mould by type technology, and similar with HPT, there are deformation problem of non-uniform, grain refinement effect is less than
ECAP and HPT.
（5）Multiway forging：The technique obtains large deformation by multiple orthogonal change open die forging direction.The crystalline substance of such deformation
Grain thinning effect will be significantly lower than ECAP and HPT.
Another kind of existing processing technology scheme：Deriving method, the same above method of basic forming principle have derived very much
SPD is molded new technology, these methods try hard to simplify tool design, reduce energy consumption, improve lumber recovery, lifting workpieces size, upgrading
The degree of automation etc., wherein including：
（1）ECAP deriving methods：Bending is straightened repeatedly（RCS), blank is placed between apparatus for bending, is moved down with upper mold, blank
It is bent over, becomes wavy；It is then straightened with 2 pieces of tablets, then carries out bending, by constantly repeating, changed in unobvious
Enough deformations, refiner material tissue are accumulated in the case of billet size.
（2）Circulation closed die forging (CCDF), mold are vertically moved in the cavity by the lower die of some section cavity and one
Same cross-sectional punch composition.The sample of sufficient lubrication with graphitic lubricant is put into lower die, a constant temperature is heated to
Degree.Workpiece is pressed into lower die by punch, after taking-up, is rotated by 90 ° in the same direction around Z axis, lower die deformation is reinserted.This
Sample, workpiece are rotated by 90 ° between continuous channel around Z axis.In this way, it is subjected to 1,3 and 5 second compression respectively.
（3）Reciprocating extrusion（CEC）, mold is made of two die cavitys, a compression strap and the punch that is positioned in two die cavitys.
Two die cavity sectional areas are equal, on same axis, pass through intermediate compression band connection.In extrusion process, sample is in punch
Under the action of, compression strap is reached, at this point, sample will be deformed by forward extrusion, punch of the workpiece after extruding in another die cavity
Under effect, Upsetting occurs.Then, another side punch is reversely pushed back workpiece by the above process, completes an extrusion cycle.
Above procedure is repeated, until obtaining desired strain.
（4）Plank continuous confined strip shearing, device using upper die and lower die and lower roll constitute two cross-sectional areas have it is a small amount of poor
Different cross one another channel.Plank is sent in die cavity, strong plastic deformation occurs in die cavity corner for plank, then from
The die cavity other side squeezes out.Groove is processed in feeding roller surface for increasing frictional force.Due to before and after deformation material it is transversal
The characteristics of area remains unchanged repeatedly can carry out plank in same mold the plastic deformation of multi-pass.
（5）Ellipse spiral wait channel pressings method (ECEA）, blank is under the action of extruding force, by round bar after upsetting pull
（Circle-elliptic transformation）, torsion（Oval cross section reverses）With reversed upsetting pull（Ellipse-circle transformation）Process becomes round bar again.Metal
Plastic Flow, and accumulation strain are mainly generated on cross section.Circle and elliptical particularity, type is utilized in mold shape
Wedge angle region is not present in chamber, keeps metal readily flowed.Realize the combination of one-time process process various deformation pattern.
（6）Continuous angle of friction squeezes（CFAE）, driven roller rotates simultaneously applies pressure P against its support element to workpiece.It is driving
Dynamic that first squeezing passage is formed between roller and workpiece support, second channel is the short slot in fixing mould component.Sheet
Workpiece is by one to eight processing, and up to 5.3, sheet material orientation remains constant for maximum equivalent logarithmic strain.
A kind of HPT deriving methods are suitable for the high pressure torsion of pipe（HPTT）, in rigid disk, mandrel is put into pipe pipe,
It is compressed under its elastic stage with compressor.It due to being compressed axially for mandrel, is radially expanded, expansion is by pipe and disk
Limitation, forms prodigious hydrostatic stress in pipe, larger frictional force is generated in the both sides of pipe.In the situation for keeping mandrel to fix
Under, the deformation of pipe is realized by external torque rotating disk.In twist process, deformation pattern is partial cut, shear plane method to
For the radial direction of pipe, shear direction is parallel to circumferencial direction.
A kind of TE deriving methods, superelevation torsion（STS）, make the region than other two part by local heating and cooling
Deformation resistance makes torsional strain（TS）Region localizes.While generating the areas TS, bar is moved along longitudinal axis, therefore
Super large plastic strain is continuously generated on entire bar.This new process STS include relative to bar other parts generate part it is soft
The bar of the movement of area and region along longitudinal direction.An important feature of STS is that the cross sectional dimensions of bar is remained unchanged in strain.
It is relatively fewer for the patent report of titanium alloy Ultra-fine Grained technique both at home and abroad.Central South University Zhou Kechao et al. is in patent
【CN 103014574 A】Be referred to a kind of preparation method of TC18 ultra-fine grain titanium alloys, wherein refer to it is detailed heat treatment and it is more
The Ultra-fine Grained technological parameter of passage upsetting pull.This technique is deformed by the way of multidirectional upsetting pull, belongs to traditional forging method.Cause
It single pass deformed area range and wears deep smaller, in order to obtain ultrafine-grained (UFG) microstructure, generally requires the repeated deformation of 8-10 passages or more.
Period is long, and efficiency is low, and generally there are apparent deformation non-uniform phenomenons.
Shanghai Communications University Wang Li is strong et al. in patent【CN 103572186 A】In be referred to using equal-diameter bending passage
The method that deformation prepares ultra-fine grain titanium matrix composite, although the background introduction of the method this patent is, it has been proposed that play can be repeated
Strong plastic deformation, but size is 10X10 X100mm after deformation, it is difficult to meet technical grade demand.Northwestern Polytechnical University Du is with more existing
Patent【CN 1446935 A】In be referred to a kind of preparation method of super fine crystal material.The method, which focuses primarily upon surface and generates, to be surpassed
Fine grain.Although deformation extent is high, can repeated deformation, be only limited to prepare nano surface crystalline substance, can not accomplish by center portion to surface
Whole Ultra-fine Grained.
Liu state of Northeastern University bosom et al. is in patent【CN 107030111 A】It is referred to a kind of equal thickness Ultra-fine Grained TC4 titaniums conjunction
The preparation method of golden plate material.The method is similar with the accumulation ply rolling in patent background introduction, which needs strong shear stress
Condition, load is larger, larger to the limitation of its size condition, can only prepare plank, can not prepare bar.From titanium alloy Ultra-fine Grained work
Skill paper report for, titanium alloy is deformed using the mode of ECAP, HPT mostly, involved product size compared with
It is small, it is difficult to generate the blocks of large material of technical grade entirety Ultra-fine Grained.
Known to comprehensive analysis：The titanium alloy Ultra-fine Grained technique referred in existing patent or paper, be all made of traditional HPT,
The methods of ECAP and ARB prepare the homogenous superfine crystalline substance material of small size under high load, are all only limited to laboratory at present and grind
System, it is difficult to prepare the large scale material of technical grade entirety Ultra-fine Grained.
Invention content
Present invention aims at providing a kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar,
To solve the problems such as mentioned above in the background art size-constrained, load is big low with efficiency.
A kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar of the present invention, including following step
Suddenly：
S1：It is 40-150mm to choose diameter dimension D, and length is the titanium alloy blank of 300-5000mm；
S2：Above-mentioned titanium alloy blank is placed in heating furnace and is heated to 800-1120 DEG C, heating time is：Titanium alloy blank diameter
D×（0.6~0.8）min；
S3：Titanium alloy blank after heating is transported to from heating furnace in skew rolling mill deflector chute, transhipment time 5-20s；
S4：Feeding is carried out in the deflector chute of skew rolling mill, and titanium alloy blank is sent into the deformation between skew rolling mill entrance and exit
Area, titanium alloy blank, which is moved in deformed area inside spin until deforming, to be terminated, and the TC18 titanium alloy rod bar bars of a diameter of Dm are obtained,
Wherein m is rolling number, rolls a diameter of D1 of the TC18 titanium alloy rod bars once obtained, rolls the TC18 titaniums obtained twice and closes
A diameter of D2 of golden bar, and so on；
S5：Above-mentioned S2-S4 steps are repeated, it is integrally ultra-fine to obtain TC18 titanium alloys to titanium alloy blank 2-8 screw rolling of progress
Crystal bar material；
The skew rolling mill is two-roller skew-rolling machine, and the roll is single cone-shaped roll, and helical groove, and helical are provided on roll
The precession direction of groove is identical as the precession direction in the titanium alloy blank operation of rolling, and cone angle gamma 1 is 17-19 degree, and roll is stung
The arc radius r for entering titanium alloy blank is 60-400mm, and roll feed angle α is 19-21 degree, and the roll off angle beta of roll is 17-19
It spends, the roll space D g between two rolls is the 87%-95% of titanium alloy blank diameter D, and roll rotational speed n is 30-55r/min；
The titanium alloy blank is large scale TC18 titanium alloy rod bars；
In the S5 steps repeat the operation of rolling heating time be TC18 titanium alloy rod bar diameters Dm ×（0.3~0.4）min.
Preferably, roll small end face is set as arc surface, and circular arc radius surface is 60-400mm.
Preferably, Groove Ovality Factor is guide plate away from DdThe ratio between with roll spacing Dg, titanium alloy blank is deforming in S4 steps
Groove Ovality Factor is used to be rolled for 1.25-1.4 in area.
Preferably, in the titanium alloy blank operation of rolling, the roll spacing Dg between two rolls immobilizes, and is advantageously implemented
Multi-pass repeats to roll.
Preferably, the screw pitch ι of helical groove is 6 ~ 15mm, and the high h of tooth is 6 ~ 15mm.
Preferably, in S5 steps repeat the operation of rolling, deformed area shape remains unchanged.
Compared with prior art, the present invention the beneficial effects of the invention are as follows：
（1）Deformed area is worn deeply greatly, and large scale entirety ultrafine-grained (UFG) microstructure can be obtained.Plastic deformation inside oblique milling process in which materials
Consist of two parts, first, the compressive deformation between roll, this is deformed into periodic breaks deformation, and another part is to continue to occur
Torsional deflection.The superposition of compression and torsional deflection makes during oblique milling that generation is clearly distinguishable from the three-dimensional routinely forged in deformed area
Severe plastic deformation；（2）Diameter of rod, which remains unchanged, before and after oblique milling reciprocally carries out multi- pass rolling.Oblique milling process exists wide
It opens up, the equivalent diameter in high temperature alloy billet cross section remains unchanged；（3）Continuous-stable local deformation, rolling loads are small, deformation
Process is steady.The real contact area of workpiece and high temperature alloy blank is only that high temperature alloy blank surface is accumulated very during oblique milling
A small part deforms for localized contact, thus load is small；（4）Pressure-torsion complex three-dimensional drastic deformation, can obtain ideal crystalline substance
Grain thinning effect.
Description of the drawings
Fig. 1 is roll schematic diagram of the present invention.
Fig. 2 is original structure crystal grain schematic diagram.
Fig. 3 is that the rolling number of the embodiment of the present invention one is 2 schematic diagrames.
Fig. 4 is that the rolling number of the embodiment of the present invention one is 6 schematic diagrames.
Fig. 5 is each mold relative position of oblique milling process of the present invention.
Fig. 6 is each mold relative position vertical view of oblique milling process of the present invention.
Fig. 7 is that oblique milling of the present invention passes through each mold relative position left view of journey.
Fig. 8 is oblique milling process of the present invention deformed area schematic diagram.
Reference numeral：1- rolls, 2- titanium alloy blanks, 3- guide plates.
Specific implementation mode
A kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar of the present invention, including following step
Suddenly：
S1：It is 40-150mm to choose diameter dimension D, and length is the titanium alloy blank 2 of 300-5000mm；
S2：Above-mentioned titanium alloy blank 2 is placed in heating furnace and is heated to 800-1120 DEG C, heating time is：Titanium alloy blank 2 is straight
Diameter D ×（0.6~0.8）min；
S3：Titanium alloy blank 2 after heating is transported to from heating furnace in skew rolling mill deflector chute, transhipment time 5-20s；
S4：Feeding is carried out in the deflector chute of skew rolling mill, and titanium alloy blank 2 is sent into the deformation between skew rolling mill entrance and exit
Area, titanium alloy blank 2, which is moved in deformed area inside spin until deforming, to be terminated, and the TC18 titanium alloy rod bar sticks of a diameter of Dm are obtained
Material, wherein m are rolling number, roll a diameter of D1 of the TC18 titanium alloy rod bars once obtained, roll the TC18 obtained twice
A diameter of D2 of titanium alloy rod bar, and so on；
S5：Above-mentioned S2-S4 steps are repeated, it is integrally ultra-fine to obtain TC18 titanium alloys to the 2-8 screw rolling of progress of titanium alloy blank 2
Crystal bar material；
The skew rolling mill is two-roller skew-rolling machine, and the roll 1 is single cone-shaped roll 1, and helical groove is provided on roll 1, and
The precession direction of helical groove is identical as the precession direction in 2 operation of rolling of titanium alloy blank, and cone angle gamma 1 is 17-19 degree, and is rolled
The arc radius r that roller 1 bites titanium alloy blank 2 is 60-400mm, and 1 feed angle α of roll is 19-21 degree, the roll off angle beta of roll 1
For 17-19 degree, the 87%-95% that the 1 space D g of roll between two rolls 1 is 2 diameter D of titanium alloy blank, 1 rotating speed n of roll are
30-55r/min；
The titanium alloy blank 2 is large scale TC18 titanium alloy rod bars；
In the S5 steps repeat the operation of rolling heating time be TC18 titanium alloy rod bar diameters Dm ×（0.3~0.4）min.
1 small end face of roll is set as arc surface, and circular arc radius surface is 60-400mm.
Groove Ovality Factor is guide plate 3 away from DdThe ratio between with roll spacing Dg, titanium alloy blank 2 is adopted in deformed area in S4 steps
It is that 1.25-1.4 is rolled with Groove Ovality Factor.
In 2 operation of rolling of titanium alloy blank, the roll spacing Dg between two rolls 1 immobilizes, and is advantageously implemented multiple tracks
It is secondary to repeat to roll.
The screw pitch ι of helical groove is 6 ~ 15mm, and the high h of tooth is 6 ~ 15mm.
In S5 steps repeat the operation of rolling, deformed area shape remains unchanged.
1 small end face of roll is arc surface in the present invention, and cylindrical titanium alloy blank 2 quickly can be become cylindroid by this
Shape, to provide enough deflections when constant roll gap screw rolling；1 body shape of roll is single taper, cone angle and roll off angle phase
Deng compared with common roll 1, outer diameter compressive deformation section length increases to 2 times of length, and rolled piece passes through than commonly rolling longer change
Behind shape area, big plastic deformation can occur for accumulation；It is rolled using larger ellipse coefficient, titanium alloy blank 2 is drawn into roll 1
Afterwards, cross section becomes ellipse, during being threadingly advanced, since transverse radius is more than 1 spacing of roll, titanium alloy blank
2 bear always the small deformation amount compression of roll 1, and the rotation of deformed area arbitrary point is turned around, twice by the compression of roll 1；It can be repeated multiple times
Realize screw rolling, due to big ovality, the diameter of rod after screw rolling is more than roll spacing, and deformed rolled piece can be repeatedly
Repeatedly under the conditions of same deformation parameter, by repeat-rolling, the deflection of bigger can be obtained in this way；Using larger feeding angle and greatly
Roll off angle, can obtain more stablize be threadingly advanced power, to adapt to the demand of large plastometric set, and by the tapered roll
Helical groove power-assisted deformation, on the basis of original deformation, then be superimposed small-scale compression and be bent it is shear-deformable, it is final real
Existing super large plastic deformation, has the function that crystal grain thinning.
The type of material processing is generally distinguished with recrystallization temperature, more than recrystallization temperature is hot-working, recrystallization temperature
It is below cold working, prior art preparation Ultra-fine Grained is all made of cold working, since deflection is inadequate, can only be obtained so that dislocation is accumulative
Smaller crystal grain, but this crystal grain thermal stability is poor, cannot be heat-treated.The purpose of this patent is to obtain to be heat-treated
Crystal grain, i.e., Ultra-fine Grained is obtained by way of accumulating large deformation by recrystallization, to be different from traditional cold working difference
It opens.
Therefore this patent provides the choosing of an actuality for the preparation of industrialization of large scale TC18 entirety ultra fine grained steel bars
It selects.
Embodiment one：
Using above-mentioned technical parameter, design processing screw rolling roll 1 is as shown in Figure 1；
S1：Primary deformable parameters selection titanium alloy T C18, diameter D are 100mm, length 800mm；Spiral roll 1 bites circle
Arc radius r is 60mm, and tapered roll cone angle gamma 1 is 18 °, and feed angle α is 20 °, and roll off angle beta is 18 °, and 1 screw pitch ι of spiral roll is
13mm, the high h of tooth are 9mm, and 1 space D g of roll is the 88% of blank diameter D, and ellipse coefficient 1.25,1 rotating speed n of roll is 32r/
min；
S2：Titanium alloy cylindrical blank is heated in heating furnace to 850 DEG C, heating time is 80 minutes；
S3：The blank that would be heated to temperature is transported to from heating furnace in skew rolling mill deflector chute, transhipment time 10s；
S4：Blank, which is moved in deformed area inside spin until deforming, to be terminated；
S5：Repeat-rolling 2 times and the analysis of 6 sub-samplings, notable for the effect of titanium alloy crystal grain refinement, crystallite dimension is tiny,
And the heating time for repeating the operation of rolling is：TC18 titanium alloy rod bar diameters Dm ×（0.3~0.4）Min, wherein m are rolling time
Number, rolls a diameter of D1 of the TC18 titanium alloy rod bars once obtained, and rolling is the TC18 titanium alloys using a diameter of D1 twice
Bar is rolled again as blank, a diameter of D2 of obtained TC18 titanium alloy rod bars, and so on, the multiple operation of rolling
In, deformed area shape remains unchanged.
Based on examples detailed above, for original structure as shown in Fig. 2, in figure based on β crystal grain, β average grain sizes are 80um；Its
Using the method for the present invention, Fig. 3 is to roll the typical titanium alloy crystal grain figure that number is 2, and wherein crystallite dimension is 8um or so, crystal grain
Degree of refinement is 90%；Fig. 4 is to roll the titanium alloy crystal grain figure that number is 6, and wherein crystallite dimension is 2.5um or so, crystal grain refinement
Degree is 96.88%.Its operation principle is as shown in figure 8, position relationship such as Fig. 5, Fig. 6 and Fig. 7 institute between roll 1 and guide plate 3
Show.
In summary：A kind of helical tapered roll etc. of large scale TC18 titanium alloys entirety ultra fine grained steel bar provided by the invention
Roll spacing milling method by the shape of design spiral tapered roll, and keeps roll spacing in deformed area constant, using super large deformed area hole
Type ellipse coefficient carries out multi- pass rolling repeatedly, is gradually accumulated as super large plastic deformation；Moreover, this method can carry out multi-pass
Screw rolling, for variety classes titanium alloy, rolling number is best for the effect of titanium alloy crystal grain refinement within the scope of 2-8,
The whole Ultra-fine Grained size obtained is minimum.The technique is suitable for various sizes specification and the titanium alloy rod bar low load of type is continuous
Severe plastic deformation.It is used to prepare integral fine crystal/ultra fine grained steel bar of 1000 ~ 3000nm.And existing violent plasticity can be overcome to become
Shape rigid resistance is big, can only process the deficiency of small size workpiece.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar, which is characterized in that including following
Step：
S1：It is 40-150mm to choose diameter dimension D, and length is the titanium alloy blank of 300-5000mm（2）；
S2：By above-mentioned titanium alloy blank（2）It places in heating furnace and is heated to 800-1120 DEG C, heating time is：Titanium alloy blank
（2）Diameter D ×（0.6~0.8）min；
S3：By the titanium alloy blank after heating（2）It is transported in skew rolling mill deflector chute from heating furnace, transhipment time 5-20s；
S4：Feeding is carried out in the deflector chute of skew rolling mill, by titanium alloy blank（2）The change being sent between skew rolling mill entrance and exit
Shape area, titanium alloy blank（2）In deformed area, inside spin movement terminates to obtain the titanium alloy rod bar of a diameter of Dm until deforming, wherein
M is rolling number；
S5：Above-mentioned S2-S4 steps are repeated, to titanium alloy blank（2）2-8 screw rolling of progress obtains TC18 titanium alloys and integrally surpasses
Fine grain bar；
The skew rolling mill is two-roller skew-rolling machine, the roll（1）It is single cone-shaped roll（1）, roll（1）On be provided with helical and roll
Slot, and the precession direction of helical groove and titanium alloy blank（2）Precession direction in the operation of rolling is identical, and cone angle gamma 1 is 17-19
Degree, and roll（1）Bite titanium alloy blank（2）Arc radius r be 60-400mm, roll（1）Feed angle α is 19-21 degree, is rolled
Roller（1）Roll off angle beta be 17-19 degree, two rolls（1）Between roll（1）Space D g is titanium alloy blank（2）Diameter D's
87%-95%, roll（1）Rotating speed n is 30-55r/min；
The titanium alloy blank（2）For large scale TC18 titanium alloy rod bars；
In the S5 steps repeat the operation of rolling heating time be TC18 titanium alloy rod bar diameters Dm ×（0.3~0.4）min.
2. a kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar as described in claim 1, special
Sign is, the roll（1）Small end face is set as arc surface, and circular arc radius surface is 60-400mm.
3. a kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar as described in claim 1, special
Sign is that Groove Ovality Factor is guide plate（3）Away from DdThe ratio between with roll spacing Dg, titanium alloy blank in S4 steps（2）In deformed area
It is interior that Groove Ovality Factor is used to be rolled for 1.25-1.4.
4. a kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar as described in claim 1, special
Sign is, in titanium alloy blank（2）In the operation of rolling, two rolls（1）Between roll spacing Dg immobilize.
5. a kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar as described in claim 1, special
Sign is that the screw pitch ι of the helical groove is 6 ~ 15mm, and the high h of tooth is 6 ~ 15mm.
6. a kind of equidistant milling method of helical tapered roll of large-scale titanium alloy ultra fine grained steel bar as described in claim 1, special
Sign is that in S5 steps repeat the operation of rolling, deformed area shape remains unchanged.
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| CN111441020A (en) * | 2020-04-30 | 2020-07-24 | 西安建筑科技大学 | Method for preparing TC4 titanium alloy sputtering target material at low cost |
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| CN115301731A (en) * | 2022-08-12 | 2022-11-08 | 索罗曼(常州)合金新材料有限公司 | Equidistant rolling method for spiral conical roller of large-size titanium alloy bar |
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Denomination of invention: A spiral cone roller equidistant rolling method for large-sized titanium alloy ultrafine grain bars Granted publication date: 20200131 Pledgee: Chongqing Bank Co.,Ltd. Yuzui Branch Pledgor: Chongqing lianghang metal material Co.,Ltd. Registration number: Y2024500000013 |