CN104307908A - Equal channel forming die for thick-wall pipe and method of forming die for forming pipe - Google Patents
Equal channel forming die for thick-wall pipe and method of forming die for forming pipe Download PDFInfo
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- CN104307908A CN104307908A CN201410527027.6A CN201410527027A CN104307908A CN 104307908 A CN104307908 A CN 104307908A CN 201410527027 A CN201410527027 A CN 201410527027A CN 104307908 A CN104307908 A CN 104307908A
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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
- B21C23/085—Making tubes
Abstract
The invention relates to the technical field of forming pipes with thick walls (a ratio of pipe diameter to wall thickness is less than 20) of such metals as aluminum, copper and steel and round cross sections, and in particular discloses an equal channel forming die for a thick-wall pipe and a method of the equal channel forming die for forming the pipe. An equal channel corner variable-cross section twist extrusion forming technical scheme adopted by the invention is similar to combination of twist shear deformation and upsetting and drawing extrusion-bulging deformation on a cross section, thus realizing combination of multiple deformation modes in an extrusion process. The equal channel forming die disclosed by the invention has the advantages of good deformation effect, quick speed and high efficiency; and the equal channel forming die can overcome a shortcoming of a current process which is uneven in deformation, greatly improve stress-strain distribution and a deformation texture in the material, and simultaneously improve material performance.
Description
Technical field
The present invention relates to the forming technique field of metal thick wall (ratio of pipe external diameter and wall thickness is less than 20) the circular section tubing such as aluminium, copper, steel, specifically a kind of method waiting channel formation mould and shaping pipe thereof of thick-wall tube.
Background technology
Metal seamless tube is current the most widely used a kind of tubing, its manufacture method many employings drilling/rolling at present, some defects can be there are in the tubing surfaces externally and internally that this traditional approach is produced, for the tubing of hydraulic air, under high pressure load situation, very easily occur breaking and the substantial risk accident such as pipe cross section deformation.Due to pipe fitting tubing widely using at industrial circles such as Aero-Space, architectural engineering and plant equipment, improve its comprehensive mechanical performance for promoting that the raising of China's national defense industrial development and economic and technique level has great importance.
The surfaces externally and internally characteristic of tubing is rolled for improving perforation, and suppressing the appearance of its defect, SUMITOMO CHEMICAL metal industry strain formula meeting (publication number is the patent of CN101980802A) and Jinlong Precisive Copper Pipes Group Co., Ltd's (publication number is the patent of CN101569893) have all carried out Upgrading to the manufacture method of seamless pipe.Although above-mentioned two kinds of techniques improve pipe performance to a certain extent, little to the improvement degree of pipe performance, and production technology is comparatively complicated, production cost is higher.
It is a kind of plastic molding method got most of the attention now that severe plastic deformation (SPD) prepares the brilliant material of high-performance superfine, the method has been extended to the preparation field of tube material from the research and development of block grained material, abroad now having proposed some prepares high strength, high performance pipe new method, as Tubular Channel Angular Pressing (Faraji G, Iranian patent no. 389110832, Filed 12 Feb 2011.), High-pressure Tube Twisting (T ó th L S, Arzaghi M, Fundenberger J J, et al. Scripta Mater, 2009, 60 (3): 1765, Lapovok R, Pougis A, Lemiale V, et al. J Mater Sci, 2010,45 (17): 4554) and Tube Channel Pressing (Zangiabadi A, Kazeminezhad M. Mater Sci Eng A, 2011,528 (15): 5066) etc., but these methods also also exist many weak points, as poor in tubing inside and outside wall deformation uniformity, to the restriction of tube wall thickness and diameter, and more high to the requirement of production equipment.Domestic Northwestern Polytechnical University is the two kinds of tubing variable cross-section drawing formings and pressing method that propose in the patent application of CN 202398639 and CN 202316624 at publication number, these two kinds of methods are all the crystal grain thinnings utilizing the torsion of oval cross section to reach simple shear, and then improve the object of the strength of materials, but its Mould Machining difficulty and be out of shape the weak point such as uneven and have much room for improvement and discuss.
How developing high strength grade, high performance pipe part, is that the forward position that Materials Research Laboratories faces is challenged and growth requirement to meet research and production demand.
Summary of the invention
Technical problem to be solved by this invention is: how to overcome in prior art and be out of shape uneven and deficiency that is complex manufacturing, provide the method for a kind of heavy wall (ratio of pipe external diameter and wall thickness is less than 20) tube extrusion mould and forming tube thereof.
The technical solution adopted in the present invention is: a kind of mould such as channel formation such as grade of thick-wall tube, comprise punch, external mold and internal mold, punch is pipe fitting, the outer radius of punch is equal with inside radius with the outer radius of preform tubing with inside radius, external mold is the two lobe moulds fastening a formation hollow molded cavity, internal mold is unitary mould, outer die casing is in the outside of internal mold, the central axes of external mold and internal mold, the axial length of internal mold is equal with the axial length of external mold, the axial length of internal mold is 2.5 times of the axial length of preformed tubing, extrusion die cavity is formed between external mold and internal mold, extrusion die cavity is from left to right divided into the first boot segment successively, annular-positive eight side ring deformation sections, first corner twist section, second corner twist section, positive eight side ring shape-annular deformation section and the second boot segments, first boot segment is isometrical passage, its thickness is identical with interior outer radius with the wall thickness of preform tubing with interior outer radius, annular-positive eight side ring deformation sections are the passage that smoothly transits of homalographic distortion shape, its left side is that circular ring section connects with the right side of the first boot segment, right side is positive eight side ring tee sections, the inside and outside octagon of its positive eight side ring shapes is the circumscribed octagon of the first boot segment circular ring section inside and outside circle, first corner twist section is that rounding smoothly transits passage, its left side is that positive eight side ring tee sections connect with the right side of annular-positive eight side ring deformation sections, the inside and outside octagon of its positive eight side ring shapes is the circumscribed octagon of the first boot segment circular ring section inside and outside circle, right side is positive eight side ring tee sections, the inscribed circle radius of the inside and outside octagon of its positive eight side ring shapes is that the wall thickness that radius that the radius of internal mold adds c and internal mold adds preform tubing adds c, its left and right both ends of the surface with the central axis of internal mold for axle reverses β/2 angle, second corner twist section is that rounding smoothly transits passage, its left side is that positive eight side ring tee sections connect with the right side of the first corner twist section, the inscribed circle radius of the inside and outside octagon of its positive eight side ring shapes is that the wall thickness that radius that the radius of internal mold adds c and internal mold adds preform tubing adds c, its left and right both ends of the surface with the central axis of internal mold for axle reverses β/2 angle, 30 ° >=β >=90 °, b≤c≤2b, b is the wall thickness of preform tubing, right side is positive eight side ring tee sections, the inside and outside octagon of its positive eight side ring shapes is the circumscribed octagon of the first boot segment circular ring section inside and outside circle, annular-positive eight side ring deformation sections are the passage that smoothly transits of homalographic distortion shape, its left side is that positive eight side ring tee sections connect with the second corner twist section right side, the inside and outside octagon of its positive eight side ring shapes is the circumscribed octagon of the first boot segment circular ring section inside and outside circle, right side is circular ring section, second boot segment is isometrical passage, its thickness is identical with interior outer radius with the wall thickness of preform tubing with interior outer radius.
As a kind of preferred embodiment: the first boot segment axial length is 1/2 of inner mold center axial length, annular-positive eight side ring deformation section axial lengths are 1/16 of inner mold center axial length, first corner twist section axial length is 1/16 of inner mold center axial length, second corner twist section axial length is 1/16 of inner mold center axial length, positive eight side ring shapes-annular deformation section axial length is the 1/16, second boot segment axial length of inner mold center axial length is 1/4 of inner mold center axial length.
A method for the channel formation die forming tubing such as heavy wall, carry out according to following step:
Step one, carry out annealing in process to preform tubing, and clean inside and outside wall, the clean outer wall of internal mold and the inwall of external mold, and Cold extrusion lubricant smeared by the extrusion die cavity wall formed at external mold and internal mold, clean punch also smears Cold extrusion lubricant;
Step 2, make the left and right end face of internal mold external mold concordant, and carry out fastening to whole mould, preform tubing is positioned in extrusion die cavity, make preform tubing right side concordant with the left side of annular-positive eight side ring deformation sections, punch is put into the left side of extrusion die cavity, the right side of punch and the first preform tubing left side are fitted tightly, and the left side of punch is connected to the clamping stiff end of pressurizing unit;
Step 3, punch extrude preform tubing to the right with the extrusion speed of 1 ~ 10mm/s, when punch right side contacts with the right side of the first boot segment, punch shifts out extrusion die cavity to the right with the extrusion speed of 5 ~ 10mm/s, completes the extruding of preform tubing half form;
Step 4, other preform tubing is positioned in extrusion die cavity, make preform tubing right side concordant with the left side of annular-positive eight side ring deformation sections, punch is put into the left side of extrusion die cavity, the right side of punch and preform tubing left side are fitted tightly, punch extrudes preform tubing to the right with the extrusion speed of 1 ~ 10mm/s, last whole forming tube is extruded from the extrusion die cavity on right side, when punch right side contacts with the right side of the first boot segment, punch shifts out extrusion die cavity to the right with the extrusion speed of 5 ~ 10mm/s, complete the extruding of preform tubing half form,
Step 5, repetition step 4, complete the extruding of all preformed tubing, and last root preformed tubing extruded extrusion die cavity by punch.
The invention has the beneficial effects as follows: the equal channel angular variable cross-section that the present invention takes turns round the technical scheme being extruded into shape, be similar to torsional shear distortion and upsetting pull on cross section and squeeze bulging deformation composition, achieve an extrusion process various deformation pattern combined.Tube wall is subject to the restriction of die cavity and is in strong three-dimensional compressive stress state, by the simple shear of circle-octagon-circle and corner bulging and octagon torsional variation and pure shear deformation stage, material enters the torsional shear Zona transformans in metal transfer district, under the effect of shear stress, the interior tissue of material there occurs rotation and shear strain, cause the orientation of materials microstructure, namely form new texture, improve the material deformation texture under equivalent variations degree conventional process conditions.Equal channel angular variable cross-section is turned round and is extruded into shape and can obtains the deformation extent larger than traditional forming technology, greatly improve Strain Distribution and the stress distribution of tubing inside, be conducive to cast sturcture residual in broken pipe, and change form and the distribution of field trash, eliminate tubing internal structural flaw.
It is good that the present invention has deformation effect, and speed is fast, and the advantage that efficiency is high, instant invention overcomes the deficiency that existing process distortions is uneven, significantly improves Stress distribution and the deformation texture of material internal, reaches raising material 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 that mould of the present invention partly cuts open schematic diagram;
Fig. 2 is mould of the present invention extruding die cavity three-dimensional structure schematic diagram;
Fig. 3 is the schematic cross-section of mould of the present invention extruding die cavity centrally axis;
Fig. 4 is A-A cross section (the first boot segment and the annular-positive eight side ring deformation section interfaces) schematic diagram of Fig. 3;
Fig. 5 is B-B cross section (annular-positive eight side ring deformation sections and the first corner twist section interface) schematic diagram of Fig. 3;
Fig. 6 is C-C cross section (the first corner twist section and the second corner twist section interface) schematic diagram of Fig. 3;
Fig. 7 is D-D cross section (the second corner twist section and the positive eight side ring shapes-annular deformation section interface) schematic diagram of Fig. 3;
Fig. 8 is E-E cross section (positive eight side ring shape-annular deformation sections and the second boot segment interface) schematic diagram of Fig. 3;
Wherein: 1, punch, 2, external mold, 3, preform tubing, 4, internal mold, 5, the first boot segment, 6, annular-positive eight side ring deformation sections, the 7, first corner twist section, 8, the second corner twist section, 9, positive eight side ring shape-annular deformation sections, the 10, second boot segment.
Detailed description of the invention
As Figure 1-Figure 8, the present invention fastens primarily of external mold and internal mold and forms, external mold and internal mold are combined to form the extrusion die cavity of tubing, the cross section of extrusion die cavity becomes annular again by the annular positive eight side ring shapes that smoothly transit, the cross section of positive eight side ring shapes in the first corner twist section and the second corner twist section with the central axis of external mold or internal mold for the centre of twist reverses β angle altogether, its value is 30 ° ~ 90 °, and wherein α is reference point angle, is arbitrary value; Whole extrusion die cavity gap is constant, equals the wall thickness b of preform tubing.
Extrusion die comprises the first punch, external mold and internal mold.
First punch is pipe fitting, and the left side of the first punch is connected to the clamping stiff end of pressurizing unit, and the right side of the first punch is extruding working end, contacts with the left side of preform tubing.The wall thickness of the first punch is equal with the wall thickness of preform tubing, is all b, and internal diameter and the external diameter of the internal diameter of the first punch and external diameter and preform tubing are equal, is respectively 2R and 2 (R+b).
External mold is the two lobe moulds that can fasten, and two lobe external molds fasten formation hollow molded cavities, and internal mold is unitary mould, and the length of external mold and internal mold centrally axis is 2.5 times of preform pipe length.It is little that external diameter due to internal mold fastens than external mold the die cavity internal diameter formed, and when the central axes of external mold and internal mold, and when external mold is concordant with the left and right both ends of the surface of internal mold, thus forms the extrusion die cavity of a forming tube at the hollow molded cavity of external mold.The feature of this extrusion die cavity is, the cross section of extrusion die cavity centrally axis is divided into the first boot segment, annular-positive eight side ring deformation sections, the first corner twist section, the second corner twist section, positive eight side ring shape-annular deformation section and the second boot segments from the first end face to the second end face.
First boot segment of extrusion die cavity is isometrical passage, and size is identical with inside radius R and outer radius R+b with the wall thickness b of preform tubing, and the first boot segment axial length is 1/2 of external mold or inner mold center axial length.
Annular-positive eight side ring deformation the sections of extrusion die cavity are the passage that smoothly transits of homalographic distortion shape, the left side of annular-positive eight side ring deformation sections connects with the right side of the first boot segment, end face is circular ring section, the right side of annular-positive eight side ring deformation sections connects with the left side of the first corner twist section, end face is positive eight side ring tee sections, the interior octagon of its positive eight side ring shapes is the circumscribed octagon of the first boot segment circular ring section inner circle, the outer octagon of octagon annular is the circumscribed octagon of the first boot segment circular ring section cylindrical, the axial length of annular-positive eight side ring deformation sections is 1/16 of external mold or inner mold center axial length.
The right side of the first corner twist section connects with the second corner twist section left side, the right side of the first corner twist section is positive eight side ring tee sections, the interior octagon of these positive eight side ring tee sections is the circumscribed octagon of bulging annular inner circle, the outer octagon of these positive eight side ring tee sections is the circumscribed octagon of bulging annular cylindrical, the concentric center of circle of bulging annular is positioned on the interface of the first corner twist section and the second corner twist section, and be positioned on the central axis of external mold and internal mold, the outer radius of this bulging annular is R+c+b, the inside radius of bulging annular is R+c, wherein b≤c≤2b, R is the inside radius of preform tubing, also be the inside radius of extrusion die cavity, b is the wall thickness of preform tubing, also be the gap of extrusion die cavity, the changeover portion of the first corner twist section and the second corner twist section all smoothly transits with rounding.The positive eight side ring tee sections of the first corner twist section left side place smoothly transit the positive eight side ring tee sections at the first corner twist section right side place; two sections with the central axis of external mold or internal mold for centre of twist axle has reversed β/2 angle altogether; its span is 30 ° ~ 90 °; wherein α is reference point angle, is arbitrary value.The axial length of the first corner twist section is 1/16 of external mold or inner mold center axial length.
The right side of the second corner twist section connects with the left side of octagon deformation section-circular deformation sections, the left side of the second corner twist section connects with the first corner twist section right side, the right side of the second corner twist section is positive eight side ring tee sections, the interior octagon of these positive eight side ring tee sections is circumscribed octagon circular in the second boot segment circular ring section, the outer octagon of positive eight side ring tee sections is the circumscribed octagon of the second boot segment circular ring section outer ring, second corner reverses and smoothly transits with rounding with the changeover portion of octagon deformation section-circular deformation sections.The positive eight side ring tee sections of the second corner twist section left side place smoothly transit the positive eight side ring tee sections at the second corner twist section right side place; two sections is with the central axis of external mold or internal mold for centre of twist axle has reversed β/2 angle altogether, and its span is 30 ° ~ 90 °.The axial length of the second corner twist section is 1/16 of external mold or inner mold center axial length.
Annular-positive eight side ring deformation the sections of extrusion die cavity are the passage that smoothly transits of the cross section of homalographic distortion shape, the right side of annular-positive eight side ring deformation sections connects with the left side of the second boot segment, this end face is circular ring section, the left side of annular-positive eight side ring deformation sections connects with the right side of the second corner twist section, its end face is positive eight side ring tee sections, the inside and outside octagon of its positive eight side ring shapes is respectively the circumscribed octagon of the second boot segment annular inside and outside circle tee section, the length of annular-positive eight side ring deformation sections is 1/16 of external mold or inner mold center axial length.
Second boot segment of extrusion die cavity is isometrical passage, and size is identical with internal diameter R and external diameter R+b with the wall thickness b of preform tubing, and the second boot segment axial length is 1/4 of external mold or inner mold center axial length.
A method for the channel formation die forming tubing such as heavy wall, carry out according to following step:
Step one, carry out annealing in process to preform tubing, and clean inside and outside wall, the clean outer wall of internal mold and the inwall of external mold, and Cold extrusion lubricant smeared by the extrusion die cavity wall formed at external mold and internal mold, clean punch also smears Cold extrusion lubricant;
Step 2, make the left and right end face of internal mold external mold concordant, and carry out fastening to whole mould, preform tubing is positioned in extrusion die cavity, make preform tubing right side concordant with the left side of annular-positive eight side ring deformation sections, punch is put into the left side of extrusion die cavity, the right side of punch and the first preform tubing left side are fitted tightly, and the left side of punch is connected to the clamping stiff end of pressurizing unit;
Step 3, punch extrude preform tubing to the right with the extrusion speed of 1 ~ 10mm/s, when punch right side contacts with the right side of the first boot segment, punch shifts out extrusion die cavity to the right with the extrusion speed of 5 ~ 10mm/s, completes the extruding of preform tubing half form;
Step 4, other preform tubing is positioned in extrusion die cavity, make preform tubing right side concordant with the left side of annular-positive eight side ring deformation sections, punch is put into the left side of extrusion die cavity, the right side of punch and preform tubing left side are fitted tightly, punch extrudes preform tubing to the right with the extrusion speed of 1 ~ 10mm/s, last whole forming tube is extruded from the extrusion die cavity on right side, when punch right side contacts with the right side of the first boot segment, punch shifts out extrusion die cavity to the right with the extrusion speed of 5 ~ 10mm/s, complete the extruding of preform tubing half form,
Step 5, repetition step 4, complete the extruding of all preformed tubing, and last root preformed tubing extruded extrusion die cavity by punch.
The equal channel angular variable cross-section that the present invention takes turns round the technical scheme being extruded into shape, is similar to torsional shear distortion and upsetting pull on cross section and squeezes bulging deformation composition, achieve an extrusion process various deformation pattern combined.Tube wall is subject to the restriction of die cavity and is in strong three-dimensional compressive stress state, by the simple shear of circle-octagon-circle and corner bulging and octagon torsional variation and pure shear deformation stage, material enters the torsional shear Zona transformans in metal transfer district, under the effect of shear stress, the interior tissue of material there occurs rotation and shear strain, cause the orientation of materials microstructure, namely form new texture, improve the material deformation texture under equivalent variations degree conventional process conditions.Equal channel angular variable cross-section is turned round and is extruded into shape and can obtains the deformation extent larger than traditional forming technology, greatly improve Strain Distribution and the stress distribution of tubing inside, be conducive to cast sturcture residual in broken pipe, and change form and the distribution of field trash, eliminate tubing internal structural flaw.
A kind of channel variable cross-section extrusion die such as grade for tubing involved in the present invention and manufacturing process, there is deformation effect good, speed is fast, the advantage that efficiency is high, overcome the deficiency that existing process distortions is uneven, significantly improve Stress distribution and the deformation texture of material internal, reach raising material 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.
Claims (3)
1. the mould such as channel formation such as grade of a thick-wall tube, it is characterized in that: comprise punch, external mold and internal mold, punch is pipe fitting, the outer radius of punch is equal with inside radius with the outer radius of preform tubing with inside radius, external mold is the two lobe moulds fastening a formation hollow molded cavity, internal mold is unitary mould, outer die casing is in the outside of internal mold, the central axes of external mold and internal mold, the axial length of internal mold is equal with the axial length of external mold, the axial length of internal mold is 2.5 times of the axial length of preformed tubing, extrusion die cavity is formed between external mold and internal mold, extrusion die cavity is from left to right divided into the first boot segment successively, annular-positive eight side ring deformation sections, first corner twist section, second corner twist section, positive eight side ring shape-annular deformation section and the second boot segments, first boot segment is isometrical passage, its thickness is identical with interior outer radius with the wall thickness of preform tubing with interior outer radius, annular-positive eight side ring deformation sections are the passage that smoothly transits of homalographic distortion shape, its left side is that circular ring section connects with the right side of the first boot segment, right side is positive eight side ring tee sections, the inside and outside octagon of its positive eight side ring shapes is the circumscribed octagon of the first boot segment circular ring section inside and outside circle, first corner twist section is that rounding smoothly transits passage, its left side is that positive eight side ring tee sections connect with the right side of annular-positive eight side ring deformation sections, the inside and outside octagon of its positive eight side ring shapes is the circumscribed octagon of the first boot segment circular ring section inside and outside circle, right side is positive eight side ring tee sections, the inscribed circle radius of the inside and outside octagon of its positive eight side ring shapes is that the wall thickness that radius that the radius of internal mold adds c and internal mold adds preform tubing adds c, its left and right both ends of the surface with the central axis of internal mold for axle reverses β/2 angle, second corner twist section is that rounding smoothly transits passage, its left side is that positive eight side ring tee sections connect with the right side of the first corner twist section, the inscribed circle radius of the inside and outside octagon of its positive eight side ring shapes is that the wall thickness that radius that the radius of internal mold adds c and internal mold adds preform tubing adds c, its left and right both ends of the surface with the central axis of internal mold for axle reverses β/2 angle, 30 ° >=β >=90 °, b≤c≤2b, b is the wall thickness of preform tubing, right side is positive eight side ring tee sections, the inside and outside octagon of its positive eight side ring shapes is the circumscribed octagon of the first boot segment circular ring section inside and outside circle, annular-positive eight side ring deformation sections are the passage that smoothly transits of homalographic distortion shape, its left side is that positive eight side ring tee sections connect with the second corner twist section right side, the inside and outside octagon of its positive eight side ring shapes is the circumscribed octagon of the first boot segment circular ring section inside and outside circle, right side is circular ring section, second boot segment is isometrical passage, its thickness is identical with interior outer radius with the wall thickness of preform tubing with interior outer radius.
2. the mould such as channel formation such as grade of a kind of thick-wall tube according to claim 1, it is characterized in that: the first boot segment axial length is 1/2 of inner mold center axial length, annular-positive eight side ring deformation section axial lengths are 1/16 of inner mold center axial length, first corner twist section axial length is 1/16 of inner mold center axial length, second corner twist section axial length is 1/16 of inner mold center axial length, positive eight side ring shapes-annular deformation section axial length is 1/16 of inner mold center axial length, second boot segment axial length is 1/4 of inner mold center axial length.
3. utilize a method for the channel formation die forming tubing such as heavy wall described in claim 1, it is characterized in that carrying out according to following step:
Step one, carry out annealing in process to preform tubing, and clean inside and outside wall, the clean outer wall of internal mold and the inwall of external mold, and Cold extrusion lubricant smeared by the extrusion die cavity wall formed at external mold and internal mold, clean punch also smears Cold extrusion lubricant;
Step 2, make the left and right end face of internal mold external mold concordant, and carry out fastening to whole mould, preform tubing is positioned in extrusion die cavity, make preform tubing right side concordant with the left side of annular-positive eight side ring deformation sections, punch is put into the left side of extrusion die cavity, the right side of punch and the first preform tubing left side are fitted tightly, and the left side of punch is connected to the clamping stiff end of pressurizing unit;
Step 3, punch extrude preform tubing to the right with the extrusion speed of 1 ~ 10mm/s, when punch right side contacts with the right side of the first boot segment, punch shifts out extrusion die cavity to the right with the extrusion speed of 5 ~ 10mm/s, completes the extruding of preform tubing half form;
Step 4, other preform tubing is positioned in extrusion die cavity, make preform tubing right side concordant with the left side of annular-positive eight side ring deformation sections, punch is put into the left side of extrusion die cavity, the right side of punch and preform tubing left side are fitted tightly, punch extrudes preform tubing to the right with the extrusion speed of 1 ~ 10mm/s, last whole forming tube is extruded from the extrusion die cavity on right side, when punch right side contacts with the right side of the first boot segment, punch shifts out extrusion die cavity to the right with the extrusion speed of 5 ~ 10mm/s, complete the extruding of preform tubing half form,
Step 5, repetition step 4, complete the extruding of all preformed tubing, and last root preformed tubing extruded extrusion die cavity by punch.
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| CN201410527027.6A CN104307908B (en) | 2014-10-09 | 2014-10-09 | A kind of method waiting channel formation mould and shaping pipe thereof of thick-wall tube |
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| CN201410527027.6A CN104307908B (en) | 2014-10-09 | 2014-10-09 | A kind of method waiting channel formation mould and shaping pipe thereof of thick-wall tube |
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| CN104307908B CN104307908B (en) | 2016-04-27 |
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| CN110665987A (en) * | 2019-10-12 | 2020-01-10 | 中北大学 | Extrusion forming die of magnesium alloy bar without anisotropy |
| CN113043519A (en) * | 2019-12-27 | 2021-06-29 | 天津中利特自动化设备科技有限公司 | High-stability bag extruding and expanding equipment |
| CN114011899A (en) * | 2021-11-03 | 2022-02-08 | 中北大学 | Mould for preparing ultra-fine grain pipe by shearing, twisting, extruding and deforming |
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| CN105537307A (en) * | 2015-12-11 | 2016-05-04 | 上海交通大学 | Continuous shearing and reciprocating reverse extrusion combined type machining device and method for preparing pipes |
| CN105436228A (en) * | 2015-12-11 | 2016-03-30 | 上海交通大学 | Bi-directional continuous shear deformation device and method |
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| CN106984665A (en) * | 2017-05-25 | 2017-07-28 | 天津工业大学 | A kind of off-axis rotation extruding mold and its moulding material method |
| CN107350302A (en) * | 2017-08-31 | 2017-11-17 | 西京学院 | A kind of tubing shear extrusion device and its manufacturing process |
| CN107413875A (en) * | 2017-08-31 | 2017-12-01 | 西京学院 | A kind of tube extrusion shaping dies and its manufacturing process |
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| CN107824626A (en) * | 2017-10-10 | 2018-03-23 | 太原理工大学 | A kind of extruding machining apparatus and processing method of ultra-fine grained magnesium alloy Strip |
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| CN107745016B (en) * | 2017-11-14 | 2023-09-29 | 成都顿威新型金属材料有限公司 | Lithium belt extrusion structure with cleaning medium output function |
| CN107716576B (en) * | 2017-11-14 | 2023-09-29 | 成都顿威新型金属材料有限公司 | Lithium belt extrusion structure capable of self-cleaning |
| CN108380685A (en) * | 2018-05-18 | 2018-08-10 | 西京学院 | A kind of tube extrusion die and its application method |
| CN110369618A (en) * | 2019-08-14 | 2019-10-25 | 江苏大学 | A kind of mold of high pressure torsion expanding extruding |
| CN110665987B (en) * | 2019-10-12 | 2021-02-02 | 中北大学 | Extrusion forming die of magnesium alloy bar without anisotropy |
| CN110665987A (en) * | 2019-10-12 | 2020-01-10 | 中北大学 | Extrusion forming die of magnesium alloy bar without anisotropy |
| CN113043519A (en) * | 2019-12-27 | 2021-06-29 | 天津中利特自动化设备科技有限公司 | High-stability bag extruding and expanding equipment |
| CN114011899A (en) * | 2021-11-03 | 2022-02-08 | 中北大学 | Mould for preparing ultra-fine grain pipe by shearing, twisting, extruding and deforming |
| CN115043661A (en) * | 2022-05-25 | 2022-09-13 | 西安鑫垚陶瓷复合材料有限公司 | Non-circular section optical telescope C/SiC composite material lens cone forming tool and method |
| CN115043661B (en) * | 2022-05-25 | 2023-03-21 | 西安鑫垚陶瓷复合材料有限公司 | Non-circular section optical telescope C/SiC composite material lens cone forming tool and method |
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