CN109807174A - A kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale - Google Patents
A kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale Download PDFInfo
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Abstract
A kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale of the present invention is related to field of machining, more particularly to a kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale, the following steps are included: rolling tool designs, Roller Design and guide plate design are specifically included, sets hyperbolic noodles truncated cone-shaped helical roller for roll；Structural deformation area: described two guide plate curved surfaces are staggered relatively, and two rolls are placed between the guide plate, and the region that two guide plates and two rolls surround is deformed area；The ovalitys deformed areas such as construction: ovality remains unchanged in deformed area；It chooses rolling feeding manner: pouring formula rolling mode into；A kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale of the present invention, pass through design hyperbolic noodles truncated cone-shaped helical roller and curved form guide plate, the ovalitys deformed areas such as construction, can generate severe plastic deformation under the premise of significantly inhibiting center portion Mannesmann effect.
Description
Technical field
The present invention relates to field of machining, and in particular to a kind of inverted cone helical roller Ultra-fine Grained of 45 steel bar of large scale rolls
Method processed.
Background technique
Ultra-fine Grained/nanocrystalline material and technology of preparing are one of the research hotspots of present material scientific domain.This direction
Research embodied a concentrated reflection of people by persistently refinement crystal grain be continuously improved polycrystalline material Strengthening and Toughening level effort.Wherein, especially
It is attracted people's attention with the research achievement of severe plastic deformation (Severe Plastic Deformation, abbreviation SPD) technology.
Now, the SPD technique of mainstream include high pressure torsion (HPT), equal channel angular squeeze (ECAP), accumulation pack rolling (ARB),
Multiway forging (MF) and torsion squeeze (TE) five kinds of methods, in which:
(1) high pressure torsion deforms: while loading the pressure of several GPa on material thickness, lower die or low punch rotation are logical
The rubbing action for crossing active applies torque on material cross-section, promotes material to generate and is compressed axially and tangential shear-deformable modeling
Property shape technique, the characteristics of high pressure torsion, is that workpiece is plate-like, and size is smaller, and diameter is generally 10-20mm, with a thickness of
0.2-0.5mm。
(2) miter angle extruding deforming: sample passes through the corner of two same channels under the pressure effect of formed punch, generates
Large plastometric set is sheared, and the shape of sample cross and area remain unchanged, therefore pass through that repeatedly repeatedly extrude can will be each
The dependent variable of passage is accumulated.
(3) accumulate pack rolling method: plate is handled by surface degreasing steel brush to expose its fresh surface, then by two boards
Material is superimposed together and rolling is carried out under room temperature or certain heating temperature makes two pieces of plate material be combined into one piece of plate, this
The plate of Rolling compund is cut off from centre afterwards, to obtain size two pieces of composite plates identical with original veneer material size, so
Obtain two pieces of composite plate materials are carried out to the processing of a new round afterwards.
(4) torsion squeezes: Beygelzime etc. proposes the technique.The method be also by it is shear-deformable refinement crystal grain 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 lower than
ECAP and HPT.
(5) multiway forging: the direction different to material carries out repeatedly upset and pulling, big plastic deformation is introduced, with this
To realize the refinement of crystal grain and the raising of material property.But this method is there are apparent strain gradient, strain uniformity compared with
Other SPD methods are poor, and actually active drastic deformation area size is also far from the requirement for meeting technical grade.Thus crystal grain refinement effect
Fruit will be significantly lower than ECAP and HPT.
(6) a kind of equidistant milling method (application number of helical tapered roll of 45 steel ultra fine grained steel bar of large scale
201810172808 .6), circular blank is equidistantly rolled using positive cone roller, technical parameter in the forming process: being sent into
Angle α be 19-21 degree angle beta be revolving speed n be 35-65r/min, diameter reduction ratio ε is 3.5%-16%, pass ovality is 1.32-
1.55 etc., realize the preparation of large scale ultra fine grained steel bar.But there is deformation is uneven serious and deformation is smaller etc. in this method
Deficiency remains to be further improved.
It is relatively fewer for the patent report of 45 steel Ultra-fine Grained techniques both at home and abroad.Since ultra-fine grain steel has excellent resist
The advantages that fatigue behaviour, good weldability, higher intensity and good low-temperature flexibility, has obtained extensively in manufacture field
General application.It is double that Xi'an Communications University Sun person of outstanding talent et al. is referred to a kind of stratiform Ultra-fine Grained in patent [108018503 A of CN]
Phase ferrite/martensite steel and preparation method thereof.Through two-phase section heat treatment and multi- pass rolling, it is double Ultra-fine Grained has been prepared
Xiang Gang, the thickness direction size using the super fine crystal material of this method preparation is smaller, and the thickness of plate is usually in 10mm or less.Cause
This, this method can not achieve the preparation of blocks of large super fine crystal material.
University of Science & Technology, Beijing Wu Huibin et al. is referred to a kind of nanometer/Ultra-fine Grained knot in patent [108531817 A of CN]
The super high-strength plasticity austenitic stainless steel of structure and preparation method.Ultra-fine Grained Austria is prepared for by multi- pass rolling and heat-treating methods
Family name's body stainless steel, using this method preparation super fine crystal material thickness direction size it is smaller, the thickness of plate usually 5mm with
Under.Therefore, this method can not achieve the preparation of blocks of large super fine crystal material.
University On The Mountain Of Swallows king is born et al. to be referred to a kind of 1300MPa grades of Ultra-fine Grained iron in patent [106868398 A of CN]
Ferritic/low temperature bainite dual-phase steel and preparation method thereof, the method for using plate rolling (hot rolling/warm-rolling) plus subsequent heat treatment
It is prepared for the Ultra-fine Grained plate of dissimilar alloy steels.But it is limited to the limitation of deformed area volume in the operation of rolling, size can not
Realize industrial value.
Nanjing Steel stock Co., Ltd Chu Juefei et al. is referred to a kind of ultra-fine in patent [102011045 A of CN]
The manufacturing method of crystal grain steel obtains ultra-fine grained ferrite crystal grain using the technique of controlled rolling and controlled cooling.It is limited to single pass heavy deformation
Small, penetrability is poor, and deformation is unequal, and this method can't carry out industrialized production.
The shortcomings that prior art:
(1) in ECAP deformation process, blank and mold Full connected, frictional force is big, thus molding load is big, and finished size is small, and
Stock utilization is low, and production efficiency is low, it is difficult to realize the preparation of the ultra-fine-grained material of industrialization demand.
(2) HPT shaping load is huge, and it is more than tens that existing former, which does not have industrialization large scale product generally,
The load capability of GPa is only applicable to the forming of ultra-thin product such as film, and blank is 10 ~ 15 × 1 ~ 10mm's of Φ before usually deforming
Cylindrical body.
(3) ARB technique is limited to the influence of deformed area volume and deformation uniformity, and deformed area thickness is only mm rank.
Simultaneously as prepared Ultra-fine Grained is the elongation crystal grain of pie, the more three-dimensional equi-axed crystal of mechanical property is poor.Therefore, by
The limitation of load capability and deformation degree of irregularity, ARB are only capable of preparing ultra-thin sheet material.
(4) MF and TE due to unhomogeneity of deformation it is serious, cause crystal particle scale uneven, grain structure stability is poor, property
It can reduce, and can not equally prepare large scale forging.
(5) the helical tapered roll equidistant milling method (application number 201810172808 of 45 steel ultra fine grained steel bar of large scale
.6) have the following problems: 1) roll shape of original technology is regular conical, after blank enters roll, gradually because of roller diameter
Increasing, roll is gradually increased with blank contact area speed, and the deformation velocity difference that will lead to blank center portion and edge increases, thus
Aggravation deformation unevenness.2) roll spacing is equidistant, and diameter reduction ratio gradually decreases, and deformation is smaller, thus crystal grain refinement is imitated
Fruit can gradually weaken.
Known to comprehensive analysis: the 45 steel Ultra-fine Grained techniques referred in existing patent or paper, by deformed area volumetric constraint, only
Small size super fine crystal material can be prepared, it is difficult to prepare large scale (60 ~ Φ of Φ 500mm) material of technical grade entirety Ultra-fine Grained.
Summary of the invention
It is an object of that present invention to provide one kind can obviously reduce transverse spreading deformation, reduces center portion tensile stress, while can also
Increase screw pitch, reduce the roll off number repeatedly of screw rolling, to inhibit Mans effect, reduce crackle occurrence probability and improve change
Shape uniformity, grain refining effect can gradually be reinforced, a kind of better inverted cone spiral shell of 45 steel bar of large scale of grain refining effect
Line roller Ultra-fine Grained milling method.
A kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale of the present invention, comprising the following steps:
1) rolling tool designs, and specifically includes Roller Design and guide plate design, sets hyperbolic noodles truncated cone-shaped helical for roll
Roller, specifically: the bus of roll is connected by tooth form outer profile curve and one section of smooth curve to be formed；By being set as on one side for guide plate
Curved surface；
2) structural deformation area: described two guide plate curved surfaces are staggered relatively, and two rolls are placed between the guide plate, and two are led
The region that plate and two rolls surround is deformed area；
The direction at the roll small end face center is directed toward by the large end face center of the roll on a roll in two rolls
For first direction；Being directed toward the direction at the roll small end face center by the large end face center of the roll on another roll is second
Direction；
Angle between the first direction and second direction is acute angle；
3) the ovalitys deformed area such as construction: ovality remains unchanged in deformed area；
4) it chooses rolling feeding manner: pouring formula rolling mode into, i.e., blank enters deformed area from the big end of roll in the operation of rolling；
5) diameter 60-500mm, 45 steel blanks of length 300-15000mm selection: are chosen；
6) roll: two rolls are rotated rotating around center axis thereof, by blank after heating, according to the rolling feeding manner
Blank after heating is sent into deformed area, blank advances in deformed area inside spin, and exports from roll small end, realizes that variable cross-section rolls
After completing the operation of rolling, it is cooling to carry out blank for system.
Preferably, the curve that roll tooth form top connects is the first curve, and the line between the first curve both ends is
First middle line close to the curve of small end is the second curve on roll bus, and the line between the second curve both ends is the second middle line；
The maximum distance of point the first middle line of distance on first curve is not more than 10mm, point the second middle line of distance on the second curve
Maximum distance be not more than 5mm；
Angle between first middle line and the second middle line is 4 ~ 7 degree.
Preferably, tooth form outer profile curve rotates the region in the curved surface corresponding deformation area to be formed around the roll axis on roll
For rolling zone, rolls helical spacing in region and successively decrease, it is corresponding to rotate the curved surface to be formed around the roll axis for the second curve on roll
The region of deformed area is circle area；Roll 2.5 ~ 5 times that section length is circle area length.
Preferably, roll outside diameter is 3 ~ 6 times of blank diameter, and roll end diameter is 2.5 ~ 4 times of blank diameter.
Preferably, ovality is in the same cross section in deformed area, maximum distance between two guide plates and two rolls it
Between ratio of distances constant, the ovality in deformed area at arbitrary cross section is equal, ovality 1.07-1.09.
Preferably, blank heating is that blank heats in heating furnace, and the temperature of heating is 840-960 degrees Celsius, when heating
Between T be T=Db× (0.6-0.8) min, wherein DbFor blank diameter；
Roll surface cone angle gradient α is 6.5-7.5 degree in deformed area, and the roll surface cone angle gradient α is the first middle line and roll line angle,
Feed angle β is 20-22 degree, and the feed angle is during the rolling process that roll axis and roll line are in the level comprising roll line
The angle projected on face；Roll off angle γ is 21.5-23.5 degree, and roll off angle γ is roll axis and roll line during the rolling process
The angle projected on the vertical plane comprising roll line；Roll rotational speed n is 38-65 r/min, diameter reduction ratio ε is 32-
52%, diameter reduction ratio ε are blank diameter and the difference and the ratio of blank diameter for rolling rear diameter of rod；Tooth form outer profile parameter: spiral shell
It is 8-17mm away from P, tooth form radius R is 3-6mm；
Blank is cooled to that blank is air-cooled or blank water cooling is to room temperature.
The invention has the following beneficial effects:
(1) a kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale of the present invention passes through design hyperbolic noodles circle
Platform shape helical roller and curved form guide plate, the ovalitys deformed area such as construction, can be before significantly inhibiting center portion Mannesmann effect
Put generation severe plastic deformation.
(2) by rationally designing special feed angle, roll off angle, roll rotational speed, ovality warp tool and technical parameter,
It not only can obviously reduce transverse spreading deformation, reduce center portion tensile stress, while screw pitch can also be increased, reduce screw rolling repeatedly
Roll off number, to inhibit Mans effect, reduce crackle occurrence probability and improve deformation uniformity.
(3) this preparation method be pour into formula rolling, roll be hyperbolic noodles truncated cone-shaped helical roller, blank from roller diameter most
Big one end enters roll off deformed area, is plastically deformed after being bitten；After blank enters the roll off deformed area between roll, with
The reduction of roll off deformed area roller diameter is contacted, roll is gradually decreased along the component velocity of rolled piece direction of advance, and rolled piece advance is obstructed,
Metal is reduced along axial deformation unevenness, to improve deformation uniformity.
Angle, that is, roll hyperboloid angle theta between (4) first middle lines and the second middle line is 4 ~ 7 degree, be can be effectively controlled
The ratio of rolling zone and circle area length improves the surface quality and deformation uniformity for rolling rear workpiece.Rolling zone is between roll
Away from the single taper acutely reduced, roll surface cone angle gradient α is 6.5 ~ 7.5 degree, for 2.2 ~ 4.2 times of routinely graceful formula oblique milling, it can be achieved that
The unit time diameter deformation doubled, deformation extent can remain large plastometric set, i.e. grain refining effect can be by
Gradually reinforce, grain refining effect is more preferable.
(5) it is rolled using spiral type curve roller, the flow velocity between blank surface layer and center portion metal can be significantly inhibited
Difference reduces radially non-uniform deformation extent, and tensile stress is inhibited to generate.Meanwhile the effect of kinking repeatedly between helix is multiplicable
Grain refining effect.
Detailed description of the invention
Fig. 1 is hyperbolic noodles truncated cone-shaped helical roller schematic diagram.
Fig. 2 is hyperbolic noodles truncated cone-shaped helical roller schematic diagram used in embodiment one.
Fig. 3 is operation of rolling main view.
Fig. 4 is Section A-A schematic diagram in Fig. 3.
Fig. 5 is operation of rolling top view.
Fig. 6 is 45 steel starting microstructure figures.
Fig. 7 is 45 steel microscopic structure figures after the completion of rolling in embodiment one.
Appended drawing reference: 1- roll, 2- guide plate, 3- blank.
Specific embodiment
A kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale of the present invention, comprising the following steps:
1) rolling tool designs, and specifically includes the design of roll 1 and guide plate 2 designs, set hyperbolic noodles truncated cone-shaped spiral shell for roll 1
Line roller, specifically: the bus of roll 1 is connected by tooth form outer profile curve and one section of smooth curve to be formed；By setting on one side for guide plate 2
It is set to curved surface；
2) structural deformation area: described two 2 curved surfaces of guide plate are staggered relatively, and two rolls 1 are placed between the guide plate 2, and two
The region that a guide plate 2 and two rolls 1 surround is deformed area；
3) the ovalitys deformed area such as construction: ovality remains unchanged in deformed area；
4) it chooses rolling feeding manner: pouring formula rolling mode into, i.e., blank 3 enters deformation from the big end of roll 1 in the operation of rolling
Area；
5) diameter 60-500mm, 45 steel blanks 3 of length 300-15000mm selection: are chosen；
6) roll: two rolls 1 are rotated rotating around center axis thereof, by blank 3 after heating, according to the rolling charging side
Blank 3 after heating is sent into deformed area by formula, and blank 3 advances in deformed area inside spin, and exports from 1 small end of roll, is realized and is become
After completing the operation of rolling, it is cooling to carry out blank 3 for section rolling.
The curve that 1 tooth form top of roll connects is the first curve, and the line between the first curve both ends is in first
Line close to the curve of small end is the second curve on 1 bus of roll, and the line between the second curve both ends is the second middle line；
The maximum distance of point the first middle line of distance on first curve is not more than 10mm, point the second middle line of distance on the second curve
Maximum distance be not more than 5mm；
Angle between first middle line and the second middle line is 4 ~ 7 degree.
Tooth form outer profile curve is to roll around the region that 1 axis of roll rotates the curved surface corresponding deformation area to be formed on roll 1
Area processed rolls helical spacing in region and successively decreases, and second curve rotates the curved surface to be formed to strain around 1 axis of roll on roll 1
The region in shape area is circle area；Roll 2.5 ~ 5 times that section length is circle area length.
1 outside diameter of roll is 3 ~ 6 times of 3 diameter of blank, and 1 end diameter of roll is 2.5 ~ 4 times of 3 diameter of blank.
Ovality be the same cross section in deformed area in, between the maximum distance and two rolls 1 between two guide plates 2 away from
The ratio between from, the ovality in deformed area at arbitrary cross section is equal, ovality 1.07-1.09.
Blank 3 is heated to be blank 3 and heats in heating furnace, and the temperature of heating is 840-960 degrees Celsius, and heating time T is T
=Db× (0.6-0.8) min, wherein DbFor 3 diameter of blank；
In deformed area roll surface cone angle gradient α be 6.5-7.5 degree, feed angle β is 20-22 degree, roll off angle γ be 21.5-23.5 degree,
1 revolving speed n of roll is 38-65 r/min, diameter reduction ratio ε is 32-52%, tooth form outer profile parameter: pitch P 8-17mm, tooth form
Radius R is 3-6mm；
Blank 3 is cooled to that blank 3 is air-cooled or 3 water cooling of blank is to room temperature.
Embodiment one:
Below by the specific example exemplary embodiment that the present invention will be described in detail.Following example is with 3 specification of blank for Φ 88
For × 400 45 steel bars, however, the invention is not limited thereto, the 45 of other specifications can also be produced by means of the present invention
Steel bar.
1) rolling tool designs, and specifically includes the design of roll 1 and guide plate 2 designs, set hyperbolic noodles rotary table for roll 1
Shape helical roller, specifically: it is formed as shown in Fig. 2, the bus of roll 1 is connected by tooth form outer profile curve and one section of smooth curve,
The curve a that 1 tooth form top of roll connects is the first curve, and curve b is the second curve, and the first curve a is on 1 bus of roll
Close to the big end of roll 1, the line between the first curve both ends is that the first middle line n, the second curve b is close on 1 bus of roll
The small end of roll 1, the line between the second curve both ends is the second middle line s, and the angle between the first middle line and the second middle line is
1 hyperboloid angle theta of roll is 7 degree；It sets curved surface on one side by guide plate 2；1 outside diameter D of roll is 410mm, 1 small end of roll
Diameter d is 260mm；The spiral shape of roll 1 is as shown in Fig. 2, tooth form outer profile parameter: pitch P 8mm, tooth form radius R are
3mm；Distance of the screw pitch between adjacent two tooth tops corresponding points, tooth form radius be tooth form center to tooth form circular arc any line segment.
As shown in Figure 1, the first curve arbitrary curve between m and p, and the first middle line of point distance on the first curve is most
Big distance is not more than 10mm, the second curve arbitrary curve between q and t, and the second middle line of point distance on the second curve is most
Big distance is not more than 5mm；
2) structural deformation area: being oppositely arranged on one side for curved surface is set by described two guide plates 2, and two settings of guide plate 2 are existed
Between the roll 1, the region that two guide plates 2 and two rolls 1 surround is deformed area；
Tooth form outer profile curve is rolling zone around the region that 1 axis of roll rotates the curved surface corresponding deformation area to be formed on roll 1,
Helical spacing is successively decreased in rolling region, and second curve rotates the curved surface corresponding deformation area to be formed around 1 axis of roll on roll 1
Region is circle area；Roll 3.5 times that section length is circle area length；
3) the ovalitys deformed area such as construction: ovality remains unchanged in deformed area；Ovality is 1.07；
4) it chooses rolling feeding manner: pouring formula rolling mode into, i.e., blank 3 enters deformation from the big end of roll 1 in the operation of rolling
Area；
5) selection, 45 steel bars for purchasing 88 × 400mm of Φ are that manufacturer adds through vacuum consumable electrode arc furnace melting, forging and machine
Work obtains, and quality meets rolling requirements, and each site tissue of cylindrical blank 3 is evenly distributed, do not find to be mingled with, stomata the defects of；
6) roll: two rolls 1 are rotated rotating around center axis thereof, blank 3 are heated in heating furnace, the temperature of heating is
915 degrees Celsius, heating time T is 60min, and 45 steel bars that would be heated to temperature are transported in milling train deflector chute from heating furnace, is turned
The fortune time is 8s.Wherein, the technological parameter of the operation of rolling are as follows: roll surface cone angle gradient α is 6.5 degree in deformed area, and feed angle β is 22
Degree, roll off angle γ be 23.5 degree, diameter reduction ratio ε is 48%, 1 revolving speed n of roll be 38 r/min, blank 3 from 1 big end of roll it
Between deformed area enter, and start to be rolled, blank 3 is advanced until in deformed area inside spin from the change between 1 small end of roll
The output of shape area, completes the operation of rolling.It carries out the blank 3 after the completion of rolling to be air-cooled to room temperature；
Initial tissu is as shown in fig. 6, average grain size is 111 μm in figure；Using the method for the present invention, Fig. 7 is after the completion of rolling
45 steel microscopic structures, wherein crystallite dimension is 1.8 μm or so, degree of grain refinement 98.4%.
Claims (6)
1. a kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale, comprising the following steps:
1) rolling tool designs, and specifically includes Roller Design and guide plate design, sets hyperbolic noodles truncated cone-shaped helical for roll
Roller, specifically: the bus of roll is connected by tooth form outer profile curve and one section of smooth curve to be formed；By being set as on one side for guide plate
Curved surface；
2) structural deformation area: described two guide plate curved surfaces are staggered relatively, and two rolls are placed between the guide plate, and two are led
The region that plate and two rolls surround is deformed area；
3) the ovalitys deformed area such as construction: ovality remains unchanged in deformed area；
4) it chooses rolling feeding manner: pouring formula rolling mode into, i.e., blank enters deformed area from the big end of roll in the operation of rolling；
5) diameter 60-500mm, 45 steel blanks of length 300-15000mm selection: are chosen；
6) roll: two rolls are rotated rotating around center axis thereof, by blank after heating, according to the rolling feeding manner
Blank after heating is sent into deformed area, blank advances in deformed area inside spin, and exports from roll small end, realizes that variable cross-section rolls
After completing the operation of rolling, it is cooling to carry out blank for system.
2. a kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale as described in claim 1, which is characterized in that
The curve that roll tooth form top connects is the first curve, and the line between the first curve both ends is the first middle line, is rolled
The curve of close small end is the second curve on roller bus, and the line between the second curve both ends is the second middle line；
The maximum distance of point the first middle line of distance on first curve is not more than 10mm, point the second middle line of distance on the second curve
Maximum distance be not more than 5mm；
Angle between first middle line and the second middle line is 4 ~ 7 degree.
3. a kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale as claimed in claim 2, which is characterized in that
The region that tooth form outer profile curve rotates the curved surface corresponding deformation area to be formed around the roll axis on the roll is rolling zone, is rolled
Helical spacing is successively decreased in region processed, and the second curve rotates the region in the curved surface corresponding deformation area to be formed around the roll axis on roll
For circle area；Roll 2.5 ~ 5 times that section length is circle area length.
4. a kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale as described in claim 1, which is characterized in that
The roll outside diameter is 3 ~ 6 times of blank diameter, and roll end diameter is 2.5 ~ 4 times of blank diameter.
5. a kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale as described in claim 1, which is characterized in that
The ovality be the same cross section in deformed area in, the distance between maximum distance and two rolls between two guide plates it
Than the ovality in deformed area at arbitrary cross section is equal, ovality 1.07-1.09.
6. a kind of inverted cone helical roller Ultra-fine Grained milling method of 45 steel bar of large scale as described in claim 1, which is characterized in that
The blank heating is that blank heats in heating furnace, and the temperature of heating is 840-960 degrees Celsius, and heating time T is T=Db×
(0.6-0.8) min, wherein DbFor blank diameter；
In deformed area roll surface cone angle gradient α be 6.5-7.5 degree, feed angle β is 20-22 degree, roll off angle γ be 21.5-23.5 degree,
Roll rotational speed n is 38-65r/min, diameter reduction ratio ε is 32-52%, tooth form outer profile parameter: pitch P 8-17mm, tooth form half
Diameter R is 3-6mm；
Blank is cooled to that blank is air-cooled or blank water cooling is to room temperature.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112044951A (en) * | 2020-08-13 | 2020-12-08 | 西北工业大学 | 3D-SPD (three-dimensional-spring-dry-spraying) forming method for large-size superfine bainite medium-carbon steel bar |
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| CN1135382A (en) * | 1995-05-10 | 1996-11-13 | 住友金属工业株式会社 | Method for boring/rolling seamless steel pipe and apparatus thereof |
| DE10020702A1 (en) * | 2000-04-27 | 2001-10-31 | Sms Demag Ag | Rolling mill, in particular inclined or diescher rolling mill, in modular design |
| CN103567224A (en) * | 2012-08-07 | 2014-02-12 | 江苏天工钛业科技有限公司 | Novel two-roller oblique-rolling main machine |
| CN108405607A (en) * | 2018-03-01 | 2018-08-17 | 西安东耘新金属材料有限公司 | A kind of isometric helix milling method of large-sized aluminium alloy ultra fine grained steel bar |
| CN108580548A (en) * | 2018-03-01 | 2018-09-28 | 西北工业大学 | A kind of equidistant milling method of helical tapered roll of 45 steel ultra fine grained steel bar of large scale |
| CN108580547A (en) * | 2018-03-01 | 2018-09-28 | 西安建筑科技大学 | A kind of isometric helix milling method of large-scale titanium alloy ultra fine grained steel bar |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112044951A (en) * | 2020-08-13 | 2020-12-08 | 西北工业大学 | 3D-SPD (three-dimensional-spring-dry-spraying) forming method for large-size superfine bainite medium-carbon steel bar |
| CN112044951B (en) * | 2020-08-13 | 2021-05-28 | 西北工业大学 | 3D-SPD (three-dimensional-spring-dry-spraying) forming method for large-size superfine bainite medium-carbon steel bar |
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