CN114393157B - Transverse wedge rolling method for shaft parts - Google Patents
Transverse wedge rolling method for shaft parts Download PDFInfo
- Publication number
- CN114393157B CN114393157B CN202111274939.3A CN202111274939A CN114393157B CN 114393157 B CN114393157 B CN 114393157B CN 202111274939 A CN202111274939 A CN 202111274939A CN 114393157 B CN114393157 B CN 114393157B
- Authority
- CN
- China
- Prior art keywords
- rolling
- rolled piece
- rolled
- piece
- ductility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 22
- 230000002035 prolonged effect Effects 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003121 nonmonotonic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
Abstract
The invention discloses a transverse wedge rolling method of shaft parts, which is characterized in that during rolling, a wedge rolling die is introduced into a rolled piece and is enabled to move perpendicular to a longitudinal axis of the rolled piece, and meanwhile, two ends of the rolled piece are provided with punches to apply axial compressive force to the two ends of the rolled piece, so that the compressive stress of the two ends of the rolled piece is smaller than the material yield stress during rolling, and meanwhile, the tensile stress generated by a rolling part of the rolled piece is smaller than the material yield stress, so that the ductility life of the rolled piece is prolonged; the rolling method has the advantages that the ductility life of the material can be well prolonged, and compared with the existing rolling method, the rolling method is simple in rolling and better in effect; the rotational speed of the rolled piece is reduced by a method of braking the rolled piece in the rolling process, so that the ductility life of the material can be further improved.
Description
Technical Field
The invention relates to metal forming processing of shaft parts, in particular to a transverse wedge rolling method of shaft parts.
Background
The main disadvantage of the known transverse wedge rolling method is that during the rotary continuous rolling, the core region of the rolled piece is subject to the phenomena of microcracking, loosening and even porosity, which have been known for more than 200 years in transverse rolling, known as the mannessman effect. The creation of cavities during transverse wedge rolling is an irreparable defect of the product, as it distorts the shape of the product and reduces its strength. According to the theory of strain phenomenology that the shaft piece breaks in the ductile flow on the axis of the rolled piece in the rolling process, when the accumulated strain reaches a limit value, the micro cracks generated in the rolling process are rolled and combined into macroscopic cracks, and then are converted into the cavities.
Kozhevnikova, g.v. theory and practice of transverse wedge rolling/g.v. Kozhevnikova-gmesk: in russia science, pages 2010-291, a method for improving the ductility life of a product by optimizing the parameters of transverse wedge rolling is mentioned, in particular: the widening angle beta of the wedge-shaped rolling die is reduced, the forming angle alpha of the die is increased, and the heating temperature of the rolled piece and the compression degree in the rolling process are optimized. But this method is only achieved in reverse transverse wedge rolling and transverse wedge rolling using a single die.
Disclosure of Invention
The invention aims to solve the technical problem of providing a transverse wedge rolling method for shaft parts, which is different from the existing method for improving the ductility and the service life of rolled pieces and has simple rolling method.
The technical scheme adopted for solving the technical problems is as follows: a transverse wedge rolling method for shaft parts comprises the following steps: during rolling, a wedge-shaped rolling die is introduced into a rolled piece and moves perpendicular to the longitudinal axis of the rolled piece, and meanwhile, punches are arranged at the two ends of the rolled piece to apply axial compressive force to the two ends of the rolled piece, so that the compressive stress of the two end parts is smaller than the material yield stress when the rolled piece is rolled, and meanwhile, the tensile stress generated by the rolled part of the rolled piece is smaller than the material yield stress, so that the ductility life of the rolled piece is prolonged.
Further, the rotation of the rolled piece during rolling is forcibly braked by a braking torque smaller than the rotational torque of the rolled piece.
Further, the method for braking the rolled piece comprises the following steps: the punch is connected with a braking device, and the rolling piece is braked by the moment of braking force generated by friction force between the punch and the rolling piece so as to reduce the rotation speed of the rolling piece.
Compared with the prior art, the rolling method has the advantages that the ductility life of the material can be well prolonged, and compared with the prior rolling method, the rolling method is simple in rolling and better in effect; the rotational speed of the rolled piece is reduced by a method of braking the rolled piece in the rolling process, so that the ductility life of the material can be further improved.
Drawings
FIG. 1 is a schematic rolling diagram of the present invention;
fig. 2 is a graph showing the variation of the average tensile stress in the deformation zone of the rolled material in 0 to 1.1565 seconds, when the rolling method (curve 8) according to the present invention is rolled with the conventional rolling method (curve 7) using specific rolling parameters.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1, a transverse wedge rolling method for shaft parts specifically comprises the following steps: during rolling, four wedge rolling dies 4 are introduced into the rolled stock 1 and the dies 4 are moved perpendicular to the longitudinal axis of the rolled stock 1, the wedge rolling dies 4 generating a rotational moment M of the rolled stock 1 ВРАЩ The method comprises the steps of carrying out a first treatment on the surface of the At the same time, the punches 6 are arranged at the two ends of the rolled piece 1, and the axial compression force F is applied to the two ends of the rolled piece 1 Y The rolling stock 1 is subjected to an axial compressive force F during rolling Y From the two ends, the rolling stock 1 is deformed in two deformation zones 5, the compressive stress σ being generated in the two end regions 2 2 Less than material yield stress sigma Т At the same time, the axial compression force F Y A tensile stress sigma is generated in the rolled section 3 of the rolled stock 1 3 And tensile stress sigma 3 Less than material yield stress sigma Т 。
During rolling, the ductility of a material on a rolled piece is quantitatively described by the ductility life λ:
wherein: Λ and Λ пр * The current degree of shear strain under multidirectional non-monotonic deformation (cumulative strain during transverse wedge rolling) and the ultimate degree of shear strain when the bore is created, respectively. The ductility lambda of the rolled piece before rolling is 1, gradually decreases in the rolling process and becomes zero when damaged.
The degree of ultimate shear strain Λ пр * Mainly depending on the stress state of the rolled piece, and to a greater extent on the average stress sigma/K, wherein: sigma is stress, unit: n/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the K is the ductility constant of the material, unit: n/mm 2 . Average ofTensile stress sigma 3 The lower the K, the average compressive stress sigma 2 The higher the/K, the higher the ductility of the material.
Thus, at 0>σ 2 >σ Т Within the limits of (in the description of the present application, following the rules of the theory of ductile flow of solid bodies: negative compressive stresses and positive tensile stresses) elastic compressive stresses acting on the ends of the rolled piece 1 act on the deformation zone 5 of the rolled piece 1, reducing the mean tensile stress σ thereof 3 /K, thereby increasing the ductile life of the material in the axial direction of the deformation zone 5, which achieves the intended aim of the invention: increasing the ductile life of the material in the axial region of the product.
Axial compressive force F Y Is arranged to cause compressive stress sigma in the end region 2 of the rolling stock 1 2 Not exceeding the yield stress sigma Т Otherwise ductile deformation sedimentation would occur in the end region 2, which would deteriorate the rolling conditions. And axial compressive force F Y Is also provided in order that the stress of the rolled portion 3 of the rolled stock 1 is tensile, otherwise the rolled stock will bend, which will cause the rolling process to terminate due to slippage.
Tensile stress sigma 3 Is greater than zero but less than the yield stress sigma Т (positive values). If the tensile stress sigma 3 ＝σ Т The rolled portion 3 of the rolled piece 1 will break and the rolling process will stop.
Fig. 2 shows graphs of the variation of the average tensile stress in the deformation zone of the rolled product over 0 to 1.1565 seconds, calculated by a computer, of the rolling method according to the invention (curve 8, σ=0.5K) and of the prior art rolling method (curve 7) using specific rolling parameters: rolled piece material: the initial diameter of the rolled piece of steel 45 national standard 1050-88 is 28 mm, the compression degree is 1.60, and the rolling speed is 0.3 m/s; the heating temperature of the rolled piece is 1100 ℃; the forming angle alpha of the wedge rolling die is 30 degrees, and the widening angle beta is 9 degrees. The prior rolling method is from 0 to 1.1565 seconds, the average tensile stress sigma on the rolled piece shaft 3 The average value of/K is 0.2236, the cumulative strain is 6.44, and the ultimate shear strain Λ of the rolled piece at 1100 ℃ is пр * 13.4, and the ductility life λ calculated by the formula (1) is 0.519; whereas the compressive stress generated in the end region 2 of the rolled piece 1 during rolling according to the invention is 42.4N/mm 2 The tensile stress generated in the rolled portion 3 of the rolled material 1 was 26.5N/mm 2 Are all less than 84.8N/mm of yield stress of the material 2 Average tensile stress sigma of rolled piece within 0-1.1565 seconds 3 The average value of/K is 0.0724, which is reduced by 3.09 times compared with the prior method; the cumulative strain is 6.50, and the ultimate shear strain Λ of the rolled piece пр * 18.5, a ductility life lambda of 0.643, and an increase in ductility life compared to prior art methods
Preferably, on the basis of the above-described method of the invention, the punch 6 is connected to a braking device (not shown in the figures) for generating a moment M of braking force by friction between the punch 6 and the rolling stock 1 ТОРМ The rolling stock is braked to reduce the rotational speed of the rolling stock, thereby further improving the ductile life of the material.
Setting the braking moment M generated by the punch 6 of the invention on the rolled piece 1 ТОРМ For rolling piece rotation torque M ВРАЩ By computer simulation of this process using a finite element method, an average stress on the rolled piece 1 of-0.2405 (from tensile to compressive in the three-dimensional stress strain state 3D), a cumulative strain of 6.52, and an ultimate shear strain Λ пр * A ductility life lambda of 0.776 at 29.05, the ductility life being increased compared to the prior rolling method
The scope of the present invention includes, but is not limited to, the above embodiments, and any alterations, modifications, and improvements made by those skilled in the art are intended to fall within the scope of the invention.
Claims (2)
1. A transverse wedge rolling method for shaft parts is characterized in that a wedge rolling die is introduced into a rolled piece and is moved perpendicular to the longitudinal axis of the rolled piece during rolling, and the transverse wedge rolling method is characterized in that: and the two ends of the rolled piece are provided with the punches, and axial compressive force is applied to the two ends of the rolled piece, so that the compressive stress of the two end parts is smaller than the material yield stress when the rolled piece is rolled, and the tensile stress generated by the rolled part of the rolled piece is smaller than the material yield stress at the same time, so that the ductility life of the rolled piece is prolonged.
2. A transverse wedge rolling method for shaft parts according to claim 1, wherein: the rotation of the rolled piece is forcedly braked by a braking torque smaller than the rotation torque of the rolled piece in the rolling process, and the braking method comprises the following steps: the punch is connected with a braking device, and the rolling piece is braked by the moment of braking force generated by friction force between the punch and the rolling piece so as to reduce the rotation speed of the rolling piece.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BYA20200301 | 2020-10-30 | ||
| BY20200301 | 2020-10-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114393157A CN114393157A (en) | 2022-04-26 |
| CN114393157B true CN114393157B (en) | 2023-12-08 |
Family
ID=81259595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111274939.3A Active CN114393157B (en) | 2020-10-30 | 2021-10-29 | Transverse wedge rolling method for shaft parts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114393157B (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05277537A (en) * | 1992-03-31 | 1993-10-26 | Mitsubishi Heavy Ind Ltd | Method for controlling plate thickness in roll cross rolling mill |
| JPH08267166A (en) * | 1995-03-29 | 1996-10-15 | Kitagami Seimitsu:Kk | Roll forming method for shaftlike metallic parts |
| RU2169631C2 (en) * | 1999-08-30 | 2001-06-27 | Самарский государственный аэрокосмический университет им. акад.С.П. Королева | Method for securing tubes to tube plates |
| CN1329676A (en) * | 1998-10-01 | 2002-01-02 | 通用电气公司 | Method for processing billets out of metals and alloys and article |
| JP2004074191A (en) * | 2002-08-13 | 2004-03-11 | Souki Sekkei:Kk | Roller molding method |
| JP2006247734A (en) * | 2005-03-14 | 2006-09-21 | Japan Science & Technology Agency | Twist-working method for hollow material |
| KR20090066213A (en) * | 2007-12-18 | 2009-06-23 | 에스에스아이“피지컬 테크니컬 인스티튜트 오브 내셔날 아카데미 오브 사이언스 오브 벨라루스” | The way of manufacturing parts like stepped shafts by means of cross-wedge rolling |
| CN101758149A (en) * | 2010-01-29 | 2010-06-30 | 山东中兴汽车零部件有限公司 | Rotator shaft residual material-free obliquely and transversely rolling method and special mold |
| JP2014024179A (en) * | 2012-07-30 | 2014-02-06 | Kobe Steel Ltd | Method of manufacturing bar steel product |
| CN105170645A (en) * | 2015-09-08 | 2015-12-23 | 战广斌 | Shaft three-roller wedge cross rolling mill |
| CN105562429A (en) * | 2016-01-29 | 2016-05-11 | 北京科技大学 | Method for solving internal defect of small-area-reduction-percentage rolled piece and cross wedge rolling mold of method |
| CN105710130A (en) * | 2016-03-30 | 2016-06-29 | 宁波大学 | Floating pressing device for cross-wedge-rolled pieces |
| CN106424137A (en) * | 2016-10-25 | 2017-02-22 | 沈阳理工大学 | Zero-broadside magnesium alloy board rolling method and apparatus used in method |
| CN111069290A (en) * | 2019-12-25 | 2020-04-28 | 宝鸡法士特齿轮有限责任公司 | Cross wedge rolling roller and cross wedge rolling method |
-
2021
- 2021-10-29 CN CN202111274939.3A patent/CN114393157B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05277537A (en) * | 1992-03-31 | 1993-10-26 | Mitsubishi Heavy Ind Ltd | Method for controlling plate thickness in roll cross rolling mill |
| JPH08267166A (en) * | 1995-03-29 | 1996-10-15 | Kitagami Seimitsu:Kk | Roll forming method for shaftlike metallic parts |
| CN1329676A (en) * | 1998-10-01 | 2002-01-02 | 通用电气公司 | Method for processing billets out of metals and alloys and article |
| RU2169631C2 (en) * | 1999-08-30 | 2001-06-27 | Самарский государственный аэрокосмический университет им. акад.С.П. Королева | Method for securing tubes to tube plates |
| JP2004074191A (en) * | 2002-08-13 | 2004-03-11 | Souki Sekkei:Kk | Roller molding method |
| JP2006247734A (en) * | 2005-03-14 | 2006-09-21 | Japan Science & Technology Agency | Twist-working method for hollow material |
| KR20090066213A (en) * | 2007-12-18 | 2009-06-23 | 에스에스아이“피지컬 테크니컬 인스티튜트 오브 내셔날 아카데미 오브 사이언스 오브 벨라루스” | The way of manufacturing parts like stepped shafts by means of cross-wedge rolling |
| CN101758149A (en) * | 2010-01-29 | 2010-06-30 | 山东中兴汽车零部件有限公司 | Rotator shaft residual material-free obliquely and transversely rolling method and special mold |
| JP2014024179A (en) * | 2012-07-30 | 2014-02-06 | Kobe Steel Ltd | Method of manufacturing bar steel product |
| CN105170645A (en) * | 2015-09-08 | 2015-12-23 | 战广斌 | Shaft three-roller wedge cross rolling mill |
| CN105562429A (en) * | 2016-01-29 | 2016-05-11 | 北京科技大学 | Method for solving internal defect of small-area-reduction-percentage rolled piece and cross wedge rolling mold of method |
| CN105710130A (en) * | 2016-03-30 | 2016-06-29 | 宁波大学 | Floating pressing device for cross-wedge-rolled pieces |
| CN106424137A (en) * | 2016-10-25 | 2017-02-22 | 沈阳理工大学 | Zero-broadside magnesium alloy board rolling method and apparatus used in method |
| CN111069290A (en) * | 2019-12-25 | 2020-04-28 | 宝鸡法士特齿轮有限责任公司 | Cross wedge rolling roller and cross wedge rolling method |
Non-Patent Citations (1)
| Title |
|---|
| 基于挡楔的楔横轧工艺应力应变分析;魏新红;束学道;彭文飞;;热加工工艺(第17期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114393157A (en) | 2022-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4305151B2 (en) | Material torsion extrusion process | |
| Ji et al. | Numerical analysis and experiment on cross wedge rolling and forging for engine valves | |
| JP2002525210A (en) | Methods and articles for processing billets from metals and alloys | |
| KR20010044765A (en) | Production method of grain refinement of difficult-to-work materials using double equal channel angular processing | |
| JP2012101247A (en) | Method for manufacture fastening component made from aluminum-based alloy, and fastening component made from aluminum-based alloy | |
| Zheng et al. | Mechanism and force-energy parameters of a hollow shaft’s multi-wedge synchrostep cross-wedge rolling | |
| Pater | Analysis of the helical-wedge rolling process for producing a long stepped shaft | |
| CN114393157B (en) | Transverse wedge rolling method for shaft parts | |
| Pater et al. | A new cross wedge rolling process for producing rail axles | |
| JP2006110621A (en) | Method for producing aluminum alloy-made die-forged product, and aluminum alloy-made preformed article for warm die-forging | |
| Han et al. | Study on the progressive forming mechanism of multi-step shafts based on convex-end billet in the cross wedge rolling technology | |
| CN114250377B (en) | Method for prejudging aging strength of high-strength aluminum alloy | |
| RU2492010C1 (en) | Method of copper and copper alloy contact wiredrawing | |
| RU2352417C2 (en) | Pressing method of profiles and matrix for implementation of current method | |
| Wang et al. | A novel method for ball forming by cross wedge rolling | |
| JP5765757B2 (en) | Method for manufacturing annular shaped material | |
| JP3097476B2 (en) | Hot plastic working method | |
| AU560097B2 (en) | Method of controlling properties of metals andalloys | |
| RU2697114C1 (en) | Method of making rod-shaped parts with a head | |
| JP3128208B2 (en) | Manufacturing method of ring-shaped parts | |
| Arsyad et al. | Influence of extrusion speed and lubrication on extrusion behavior of AA6061 as-cast, AA6061-O and AA6061-T6 | |
| Wang et al. | The influence of roll speed on the rolling of metal plates | |
| CN107881443A (en) | A kind of high-entropy alloy squeezes pier composite modification technology | |
| Rassa et al. | Effects of Equal Channel Angular Pressing (ECAP) Process with an Additional Expansion-Extrusion Stage on Microstructure and Mechanical Properties of Mg–9Al–1Zn | |
| JP2842225B2 (en) | Upset processing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |