CN104475475A - Twist extrusion forming die and twist extrusion forming method - Google Patents
Twist extrusion forming die and twist extrusion forming method Download PDFInfo
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- CN104475475A CN104475475A CN201410701271.XA CN201410701271A CN104475475A CN 104475475 A CN104475475 A CN 104475475A CN 201410701271 A CN201410701271 A CN 201410701271A CN 104475475 A CN104475475 A CN 104475475A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
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Abstract
The invention discloses a twist extrusion forming die and a twist extrusion forming method. The forming die comprises a first half die and a second half die, wherein the first half die and the second half die are tightly buckled through a bolt to form a cylinder, an extrusion die cavity is formed inside the cylinder, and a die joint of the first half die is fit and level with a die joint of the second half die; the extrusion die cavity is sequentially formed by a guide section, a large circular-regular octagonal transitional section, a regular octagonal twist section, an octagonal-small circular twist transitional section and an outlet section from an extrusion inlet to the lower side. The twist extrusion forming die has the advantages of good transformation effect, high speed and high efficiency, the weaknesses of the prior art such as non-uniformity in transformation and existence of transformation dead corner can be overcome, the stress distribution inside a material can be greatly improved, and the comprehensive performance of the material also can be improved.
Description
Technical field
The present invention relates to one and turn round crowded shaping dies and manufacturing process, be specifically related to one and turn round crowded shaping dies and manufacturing process thereof, belong to the extrusion forming technology field of metal material.
Background technology
Research finds, torsion combines to be shaped with extruding and can not only reduce the load of material forming, also can improve the uniformity of material deformation, improve the physical property of material.For realizing combining of conventional extruded and torsional deflection, Chinese scholars it is also proposed multiple realization and turns round the method being extruded into shape.Modal implementation method is by applying moment of torsion (Kuznechno Shtampovochnoe Proizvod, 1991,9:5-6) to pressure ram, but the weak point of the method requires higher to pressure ram overall performance.Core reverses extrusion (International Journal of Mechanical Sciences, 2004,46 (3): 449-464; Journal of materials processing technology, 2008,206 (1-3): 333-344) be only applicable to the section bar that cross section is circle.The metallic extrusion molding method of rotating cavity die is by applying to reverse (material science and technique, 2012,20 (2): 117-121 to die; ZL200810064386.7), extruded product effectively can be avoided along " cut-out " of the axial streamline of cross-sectional direction, significantly reduce shaping load again simultaneously, improve utilization rate of equipment and installations.Research shows to apply to rotate the Microstructure and properties (Materials & Design, 2008,29 (7): 1316-1329) that significantly can improve goods after extrusion molding to mould, but the method exists the high problem of equipment requirement.
How developing bar simple to operation and turn round crowded new method, is that the forward position that investigation of materials field faces is challenged and growth requirement to meet research and production demand.
Summary of the invention
The present invention aims to provide and a kind ofly turns round crowded shaping dies and manufacturing process for metal bar, can be applied to scientific research and the field of engineering technology of the extrusion molding of metal material.
The present invention is achieved by the following technical solutions:
One turns round crowded shaping dies, it is characterized in that: comprise the first half module and the second half module, and the first half module and the second half module are fastened by bolts to fasten and form cylinder, and cylinder inside is extrusion die cavity, and the first half module is concordant with the die joint laminating of the second half module; Extrusion die cavity is followed successively by boot segment downwards, large circle-octagon changeover portion, octagon twist section from extruding entrance, and octagon-small circular reverses changeover portion, outlet section;
Described boot segment is isometrical passage, and cross sectional shape size is identical with the geomery of extruded bars, and its cross section is large circular, and diameter is d, 1.5 ~ 2 times of the length of boot segment to be a, a be extruded bars length;
Described large circle-octagon changeover portion is the passage that smoothly transits of homalographic distortion shape, the structure of this section of die cavity is transitioned into octagon from large circle, the end face connected with upper end boot segment is circular cross-section, the cross section contacted with lower end octagon twist section is octagon cross section, and the length of large circle-octagon changeover portion is 0.2a;
Arbitrary cross section in the both ends of the surface of described octagon twist section and this section of die cavity is the shape octagon cross section identical with area, this section of die cavity is the passage that smoothly transits, from upper surface to lower surface, have the torsion of 0.5 β angle at vertical direction, the length of octagon twist section is 0.2a;
Described octagon-small circular reverses the passage that smoothly transits that changeover portion is distortion shape, the structure of this section of die cavity is that octagon is transitioned into small circular from cross section, this section of die cavity reverses from upper end regular octagonal cross section and is transitioned into lower end small circular cross section, be 0.5 β at the windup-degree of vertical direction, the length that octagon-small circular reverses changeover portion is 0.2a;
Described outlet section is isometrical passage, and cross sectional shape is small circular, and diameter is long is 0.5d ~ 0.8d, and the length of outlet section is 0.4a.
Described β is 10 ° ~ 20 °.
One turns round extrusion forming method, adopt above-mentioned turn round crowded shaping dies to realize to turn round be extruded into shape, it is characterized in that: comprise the following steps:
Step one, prepares: carry out annealing in process to pretreatment bar, and clean bar outer surface and turn round the mould intracavity wall of crowded shaping dies, and bar outer surface and turn round extruding mold mould intracavity wall on smear extrusion lubricant;
Step 2, assembling: by screw bolt and nut fastening fastening first half module and the second half module, what make the first half module and the second half module contacts end face, bar is positioned in the boot segment of extrusion die cavity, one end of extruding drift is connected to the clamping stiff end of pressurizing unit, the other end is extruding working end, contacts with the extruding end face of institute extruded bars;
Step 3, extrusion molding: open pressurizing unit, drift is with the extrusion speed extruded bars of 1 ~ 10mm/s, when the extruding operative end surface of drift overlaps with the lower surface of die cavity boot segment, close pressurizing unit, the extruding of drift is stopped to run, open pressurizing unit again, drift promotes with the speed of 10 ~ 20mm/s, when drift completely from mould cavity out time, next pretreatment bar is positioned in the boot segment of extrusion die cavity, open pressurizing unit, drift is with the extrusion speed extruded bars of 1 ~ 10mm/s, when the extruding end face of drift overlaps with the lower surface of die cavity boot segment, close pressurizing unit, the extruding of drift is stopped to run, open pressurizing unit again, drift promotes with the speed of 10 ~ 20mm/s, first pretreatment bar can be extruded extrusion die die cavity by second pretreatment bar, first pretreatment bar passes through large circle-octagon changeover portion successively, octagon twist section, octagon-small circular reverses changeover portion, the distortion of outlet section, complete turning round of first bar and squeeze distortion,
Step 4, subsequent extrusion: repeat step 3 and complete second, third ... distortion is squeezed in turning round of bar.
The present invention proposes a kind of variable cross-section for bar and turn round extruding mold, the present invention is utilized to drive drift by pressurizing unit, make bar successively through turning round the boot segment of extruding mold die cavity, large circle-octagon changeover portion, octagon twist section, octagon-small circular reverses changeover portion, outlet section, bar cross sectional shape first becomes octagon cross section from large circular cross-section, reverse through octagon cross section again, then become small circular cross section from octagon cross section, finally form the high-performance bar of homogeneous deformation.
What the present invention taked turns round the technical scheme being extruded into shape, and the extrusion molding achieving bar is out of shape with torsional shear the combined shaping mode combined.The restriction that extruded bars is subject to die cavity is in strong three-dimensional compressive stress state, under the effect of shear stress, the interior tissue of material twists shear strain, turn round and be extruded into shape and can obtain and to be shaped larger deformation extent than conventional extruded, be conducive to the cast sturcture of crushing material, and change form and the distribution of field trash, eliminate bar internal structural flaw.
Provided by the inventionly a kind ofly turn round crowded shaping dies and manufacturing process for bar, the beneficial effect brought: it is good that the present invention has deformation effect, speed is fast, the advantage that efficiency is high, overcome the deficiency that existing process distortions is uneven, there is distortion dead angle, significantly improve the Stress distribution of material internal, improve material combination property simultaneously.This invention is reliably reasonable in design, has manufacturing process simple, the advantages such as load is little, easy and simple to handle, is conducive to reducing production cost, enhances productivity, realize the production automation.
Accompanying drawing explanation
Fig. 1 is the structural representation turning round extruding mold;
Fig. 2 is the structural representation turning round extruding mold die cavity;
Fig. 3 turns round extruding mold mold cavity space change structural representation;
Fig. 4 is that AZ31 magnesium alloy blank organizes metallograph through turning round to squeeze before and after distortion;
In figure: 1. the first half module, 2. the second half module, 3. boot segment, 4. large circle-octagon changeover portion, 5. octagon twist section, 6. octagon-small circular reverses changeover portion, 7. outlet section; I is the first cross section, and II is the second cross section, and III is the 3rd cross section, and IV is the 4th cross section.
Detailed description of the invention
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Embodiment: turn round crowded shaping dies and manufacturing process
Fig. 1 ~ 3 show the structure turning round crowded shaping dies, comprise the first half module 1 and the second half module 2, first half module 1 and the second half module 2 are fastened by bolts to fasten and form cylinder, and cylinder inside is extrusion die cavity, and the first half module 1 is concordant with the die joint laminating of the second half module 2; Extrusion die cavity is followed successively by boot segment 3 downwards, large circle-octagon changeover portion 4, octagon twist section 5 from extruding entrance, and octagon-small circular reverses changeover portion 6, outlet section 7;
Described boot segment 3 is isometrical passage, and cross sectional shape size is identical with the geomery of extruded bars, and its cross section is large circular, and diameter is 50 mm, and the length of boot segment is 225 mm;
Described large circle-octagon changeover portion 4 is the passage that smoothly transits of homalographic distortion shape, the structure of this section of die cavity is transitioned into octagon from large circle, the end face connected with upper end boot segment is circular cross-section, the end face connected with lower end octagon twist section is octagon cross section, and the length of large circle-octagon changeover portion 4 is 45 mm;
Arbitrary cross section in the both ends of the surface of described octagon twist section 5 and this section of die cavity is all the octagon cross section that shape is identical with area, this section of die cavity is the passage that smoothly transits, from upper surface to lower surface, there is the torsion of 5 ° of angles at vertical direction, the length of octagon twist section 5 is 45 mm;
Described octagon-small circular reverses the passage that smoothly transits that changeover portion 6 is distortion shape, the structure of this section of die cavity is that octagon is transitioned into small circular from cross section, this section of die cavity reverses from upper end regular octagonal cross section and is transitioned into lower end small circular cross section, be 5 ° at the windup-degree of vertical direction, the length that octagon-small circular reverses changeover portion 6 is 45 mm;
Described outlet section 7 is isometrical passage, and cross sectional shape is small circular, and diameter length is 30 mm, and the length of outlet section 7 is 90 mm.
Crowded forming test is turned round to the cylindrical AZ31 magnesium alloy blank that diameter is 50 mm and long 150 mm below.
Adopt the above-mentioned manufacturing process turning round crowded shaping dies, comprise the following steps:
Step one, prepares: carry out 350 DEG C of annealing in process to pretreatment bar, and clean bar outer surface and turn round the mould intracavity wall of crowded shaping dies, and bar outer surface and turn round extruding mold mould intracavity wall on smear extrusion lubricant MoS
2;
Step 2, assembling: be fastened by bolts fastening first half module and the second half module, what make the first half module and the second half module contacts end face, bar is positioned in the boot segment of extrusion die cavity, one end of extruding drift is connected to the clamping stiff end of pressurizing unit, the other end is extruding working end, contacts with the extruding end face of institute extruded bars;
Step 3, extrusion molding: open pressurizing unit, drift is with the extrusion speed extruded bars of 5 mm/s, when the extruding operative end surface of drift overlaps with the lower surface of die cavity boot segment, close pressurizing unit, the extruding of drift is stopped to run, open pressurizing unit again, drift promotes with the speed of 15 mm/s, when drift completely from mould cavity out time, next pretreatment bar is positioned in the boot segment of extrusion die cavity, open pressurizing unit, drift is with the extrusion speed extruded bars of 5 mm/s, when the extruding end face of drift overlaps with the lower surface of die cavity boot segment, close pressurizing unit, the extruding of drift is stopped to run, open pressurizing unit again, drift promotes with the speed of 15 mm/s, first pretreatment bar can be extruded extrusion die die cavity by second pretreatment bar, first bar passes through large circle-octagon changeover portion successively, octagon twist section, octagon-small circular reverses changeover portion, the distortion of outlet section, complete the crowded twisting strain of first bar,
Step 4, subsequent extrusion: repeat step 3 and complete second, third ... distortion is squeezed in turning round of bar.
Fig. 3 is for turning round extruding mold mold cavity space change structural representation; Extrusion die cavity is followed successively by boot segment 3 downwards, large circle-octagon changeover portion 4, octagon twist section 5 from extruding entrance, and octagon-small circular reverses changeover portion 6, outlet section 7; Section deformation situation is followed successively by: the first cross section I is for large circular, and the second cross section II is octagon, and the 3rd cross section III is the octagon after reversing, and the 4th cross section IV is small circular.
Fig. 4 shows turning round of AZ31 magnesium alloy blank and squeezes the metallograph before and after being out of shape, after turning round and squeezing distortion, AZ31 magnesium alloy blank is 9. 87 μm from original average crystal grain and is refined to average crystal grain 3 μm, owing to turning round the intensive shear effect of squeezing distortion, sees that crystal grain is obviously elongated and refinement.In addition, tensile strength brings up to 244 MPa by 196 MPa, and percentage elongation then rises to 16. 5% by 15. 4%.
The object of the invention is to propose a kind of bar simple to operation and turn round crowded new method, is that the forward position that investigation of materials field faces is challenged and growth requirement to meet research and production demand.By changing the shape and size of mould, detailed description of the invention is constant, meets the forming requirements of different jumping-up blank, and more shaping embodiment inconvenience victory is lifted.
Claims (3)
1. turn round a crowded shaping dies, it is characterized in that: comprise the first half module and the second half module, the first half module and the second half module are fastened by bolts to fasten and form cylinder, and cylinder inside is extrusion die cavity, and the first half module is concordant with the die joint laminating of the second half module; Extrusion die cavity is followed successively by boot segment downwards, large circle-octagon changeover portion, octagon twist section from extruding entrance, and octagon-small circular reverses changeover portion, outlet section;
Described boot segment is isometrical passage, and cross sectional shape size is identical with the geomery of extruded bars, and its cross section is large circular, and diameter is d, and the length of boot segment is a;
Described large circle-octagon changeover portion is the passage that smoothly transits of homalographic distortion shape, the structure of this section of die cavity is transitioned into octagon from large circle, the end face connected with upper end boot segment is circular cross-section, the cross section contacted with lower end octagon twist section is octagon cross section, and the length of large circle-octagon changeover portion is 0.2a;
Arbitrary cross section in the both ends of the surface of described octagon twist section and this section of die cavity is the shape octagon cross section identical with area, this section of die cavity is the passage that smoothly transits, from upper surface to lower surface, have the torsion of 0.5 β angle at vertical direction, the length of octagon twist section is 0.2a;
Described octagon-small circular reverses the passage that smoothly transits that changeover portion is distortion shape, the structure of this section of die cavity is that octagon is transitioned into small circular from cross section, this section of die cavity reverses from upper end regular octagonal cross section and is transitioned into lower end small circular cross section, be 0.5 β at the windup-degree of vertical direction, the length that octagon-small circular reverses changeover portion is 0.2a;
Described outlet section is isometrical passage, and cross sectional shape is small circular, and diameter is long is 0.5d ~ 0.8d, and the length of outlet section is 0.4a.
2. according to claim 1ly turn round crowded shaping dies, it is characterized in that: the length a of described boot segment is 1.5 ~ 2 times of bar length, described β is 10 ° ~ 20 °.
3. adopt the manufacturing process turning round crowded shaping dies described in claim 1 or 2, it is characterized in that: comprise the following steps:
Step one, prepares: carry out annealing in process to pretreatment bar, and clean bar outer surface and turn round the mould intracavity wall of crowded shaping dies, and bar outer surface and turn round extruding mold mould intracavity wall on smear extrusion lubricant;
Step 2, assembling: by screw bolt and nut fastening fastening first half module and the second half module, what make the first half module and the second half module contacts end face, bar is positioned in the boot segment of extrusion die cavity, one end of extruding drift is connected to the clamping stiff end of pressurizing unit, the other end is extruding working end, contacts with the extruding end face of institute extruded bars;
Step 3, extrusion molding: open pressurizing unit, drift is with the extrusion speed extruded bars of 1 ~ 10mm/s, when the extruding operative end surface of drift overlaps with the lower surface of die cavity boot segment, close pressurizing unit, the extruding of drift is stopped to run, open pressurizing unit again, drift promotes with the speed of 10 ~ 20mm/s, when drift completely from mould cavity out time, next pretreatment bar is positioned in the boot segment of extrusion die cavity, open pressurizing unit, drift is with the extrusion speed extruded bars of 1 ~ 10mm/s, when the extruding end face of drift overlaps with the lower surface of die cavity boot segment, close pressurizing unit, the extruding of drift is stopped to run, open pressurizing unit again, drift promotes with the speed of 10 ~ 20mm/s, first pretreatment bar can be extruded extrusion die die cavity by second pretreatment bar, first pretreatment bar passes through large circle-octagon changeover portion successively, octagon twist section, octagon-small circular reverses changeover portion, the distortion of outlet section, complete turning round of first bar and squeeze distortion,
Step 4, subsequent extrusion: repeat step 3 and complete second, third ... distortion is squeezed in turning round of bar.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104874629A (en) * | 2015-06-02 | 2015-09-02 | 太原理工大学 | Equal-channel U-shaped extrusion die and method |
| CN104874630A (en) * | 2015-06-02 | 2015-09-02 | 太原理工大学 | Equal-channel corner revolving extrusion die and method |
| CN105436228A (en) * | 2015-12-11 | 2016-03-30 | 上海交通大学 | Bi-directional continuous shear deformation device and method |
| CN105855396A (en) * | 2016-05-25 | 2016-08-17 | 皖西学院 | High-pressure torsion mould for cone-shaped part |
| CN106111718A (en) * | 2016-07-08 | 2016-11-16 | 哈尔滨理工大学 | A kind of forward extrusion continuously turns round composite forming device and method with squeezing |
| CN106881369A (en) * | 2017-04-18 | 2017-06-23 | 郑州航空工业管理学院 | The two-way composite extrusion die and extrusion process of a kind of magnesium alloy plate and belt |
| CN106955902A (en) * | 2017-05-25 | 2017-07-18 | 天津工业大学 | Shaping dies and its manufacturing process are squeezed in a kind of tubing rotation |
| CN107282681A (en) * | 2017-08-17 | 2017-10-24 | 西京学院 | A kind of bar screw extrusion mould and its application method |
| CN107282682A (en) * | 2017-08-17 | 2017-10-24 | 西京学院 | A kind of variable cross-section rotation extruding mold and its application method |
| CN107309381A (en) * | 2017-08-31 | 2017-11-03 | 西京学院 | A kind of material extrusion die and its manufacturing process |
| CN107685084A (en) * | 2017-08-17 | 2018-02-13 | 西京学院 | A kind of tubing screw extrusion shaping dies and its application method |
| CN108246943A (en) * | 2018-01-16 | 2018-07-06 | 西安科技大学 | A kind of prefabricated blank manufacturing process of cylindric spiral gear |
| CN108405647A (en) * | 2018-03-14 | 2018-08-17 | 哈尔滨理工大学 | A kind of circular bar is crowded to turn round shaping dies and its crowded torsion method |
| CN114472576A (en) * | 2022-01-14 | 2022-05-13 | 合肥工业大学 | Extrusion-twisting large-plastic-deformation die and forming method for ultrafine-grained bar |
| CN115591968A (en) * | 2022-10-10 | 2023-01-13 | 吉林大学（Cn） | Opposite spiral torsion extrusion die for high-performance plate |
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| CN104874630A (en) * | 2015-06-02 | 2015-09-02 | 太原理工大学 | Equal-channel corner revolving extrusion die and method |
| CN104874629A (en) * | 2015-06-02 | 2015-09-02 | 太原理工大学 | Equal-channel U-shaped extrusion die and method |
| CN105436228A (en) * | 2015-12-11 | 2016-03-30 | 上海交通大学 | Bi-directional continuous shear deformation device and method |
| CN105855396B (en) * | 2016-05-25 | 2017-12-05 | 皖西学院 | A kind of Tapered Cup high pressure torsion mould |
| CN105855396A (en) * | 2016-05-25 | 2016-08-17 | 皖西学院 | High-pressure torsion mould for cone-shaped part |
| CN106111718A (en) * | 2016-07-08 | 2016-11-16 | 哈尔滨理工大学 | A kind of forward extrusion continuously turns round composite forming device and method with squeezing |
| CN106111718B (en) * | 2016-07-08 | 2018-02-09 | 哈尔滨理工大学 | A kind of continuous forward extrusion and crowded torsion composite forming device and method |
| CN106881369A (en) * | 2017-04-18 | 2017-06-23 | 郑州航空工业管理学院 | The two-way composite extrusion die and extrusion process of a kind of magnesium alloy plate and belt |
| CN106881369B (en) * | 2017-04-18 | 2019-01-01 | 郑州航空工业管理学院 | A kind of two-way composite extrusion die and extrusion process of magnesium alloy plate and belt |
| CN106955902A (en) * | 2017-05-25 | 2017-07-18 | 天津工业大学 | Shaping dies and its manufacturing process are squeezed in a kind of tubing rotation |
| CN107282681A (en) * | 2017-08-17 | 2017-10-24 | 西京学院 | A kind of bar screw extrusion mould and its application method |
| CN107685084A (en) * | 2017-08-17 | 2018-02-13 | 西京学院 | A kind of tubing screw extrusion shaping dies and its application method |
| CN107282682A (en) * | 2017-08-17 | 2017-10-24 | 西京学院 | A kind of variable cross-section rotation extruding mold and its application method |
| CN107309381A (en) * | 2017-08-31 | 2017-11-03 | 西京学院 | A kind of material extrusion die and its manufacturing process |
| CN107309381B (en) * | 2017-08-31 | 2020-02-07 | 西京学院 | Material extrusion die and forming method thereof |
| CN108246943B (en) * | 2018-01-16 | 2020-05-05 | 西安科技大学 | Method for forming prefabricated blank of cylindrical helical gear |
| CN108246943A (en) * | 2018-01-16 | 2018-07-06 | 西安科技大学 | A kind of prefabricated blank manufacturing process of cylindric spiral gear |
| CN108405647A (en) * | 2018-03-14 | 2018-08-17 | 哈尔滨理工大学 | A kind of circular bar is crowded to turn round shaping dies and its crowded torsion method |
| CN114472576A (en) * | 2022-01-14 | 2022-05-13 | 合肥工业大学 | Extrusion-twisting large-plastic-deformation die and forming method for ultrafine-grained bar |
| CN114472576B (en) * | 2022-01-14 | 2024-03-19 | 合肥工业大学 | Ultra-fine grain bar extrusion-torsion large plastic deformation die and forming method |
| CN115591968A (en) * | 2022-10-10 | 2023-01-13 | 吉林大学（Cn） | Opposite spiral torsion extrusion die for high-performance plate |
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| CN104475475B (en) | 2016-03-23 |
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