CN102303061A - Forming method for branch type parts - Google Patents

Forming method for branch type parts Download PDF

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Publication number
CN102303061A
CN102303061A CN201110297252A CN201110297252A CN102303061A CN 102303061 A CN102303061 A CN 102303061A CN 201110297252 A CN201110297252 A CN 201110297252A CN 201110297252 A CN201110297252 A CN 201110297252A CN 102303061 A CN102303061 A CN 102303061A
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CN
China
Prior art keywords
blank
ausforming
die
lobe
dies
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CN201110297252A
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Chinese (zh)
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CN102303061B (en
Inventor
黄树海
李祖荣
赵祖德
林军
赵军
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中国兵器工业第五九研究所
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Priority to CN 201110297252 priority Critical patent/CN102303061B/en
Publication of CN102303061A publication Critical patent/CN102303061A/en
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Publication of CN102303061B publication Critical patent/CN102303061B/en

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Abstract

The invention discloses a forming method for a branch type parts, comprising working procedures of blanking, tooling of a coarse-grain ring, grade-one isothermal forming, primary bottom tooling and stamping, grade-two isothermal forming, secondary bottom tooling and stamping and toughening heat treatment, and being suitable for forming large-scale high-strength aluminum alloy and magnesium alloy branch elements. The method is characterized in that the grade-one isothermal forming uses a trivalve split segment male die, before forming, the blank is processed with the treatment of tooling the coarse-grain ring, and after being formed, the blank is processed with the primary bottom tooling and stamping; in the grade-two isothermal forming, a trivalve split segment insert is arranged in a female die cavity, and after being formed, the blank is processed with the treatment of secondary bottom tooling and sampling. The method effectively solves the restrictive problems of big difficulties in forming medium or large scale aluminum alloy and magnesium alloy branch elements, and less tonnage of equipment; technology is simple; and the formed branch type elements have better mechanical properties and high surface quality.

Description

A kind of branch class part forming method
Technical field
The present invention relates to a kind of medium-and-large-sized aluminium, magnesium alloy branch class part forming method.
Background technology
Along with the equipment lightweight requirements becomes increasingly conspicuous, be the preferred material that the light material of representative becomes the structure loss of weight with high strength alumin ium alloy, magnesium alloy, various aluminium strip steel, magnesium are more and more for aluminium shaping product processed, have satisfied the Equipment Development needs to a certain extent.
High strength alumin ium alloy, magnesium alloy materials forming temperature narrow range; Require very high to blank heating control and forming technology; The shaping of particularly medium-and-large-sized aluminium, magnesium alloy parts; There are outstanding problems such as equipment tonnage is not enough, the shaping difficulty big, structure property control difference, restricted the application in medium-and-large-sized, complex parts of aluminium, magnesium alloy.
Some aluminium alloy branch class part outside dimensions reach ¢ 390mm; Magnesium alloy branch class part outside dimension reaches ¢ 400mm, and has the elongated branch of six lobes, and shaping load is high when adopting Integratively to be shaped; The press that needs to introduce high tonnage is produced, and investment is big, cost is high; Carry out machining after adopting the whole Strengthening and Toughening heat treatment of bar, have restriction problems such as waste of material is serious, cost is high, properties of product difference.
Summary of the invention
The object of the present invention is to provide a kind of less equipment investment, branch class part forming method that stock utilization is high.
To achieve these goals, adopt following technical scheme:
A kind of branch class part forming method comprises blanking, intermediate treatment and three links of Strengthening and Toughening heat treatment, and it is characterized in that: said intermediate treatment link comprises the steps:
Car coarse grain ring step: turning is carried out on the surface of extruded bars handled;
One-level ausforming step: adopt three lobe split combined heave dies that the blank that is arranged in the one-level ausforming mould is carried out backward extrusion; Wherein three lobe split combined heave dies are made up of three punch that are 120o; One-level ausforming mould comprises die; The below of die is disposed with lower bolster and lower bolster; The heating and heat-insulating device that is arranged at the outer of lower bolster surrounds die, and push rod passes lower bolster and lower bolster can contact with blank; Three lobe split combined heave dies and die are applied lubricant; Then the blank behind the heat tracing is put into concave die cavity, three lobe split combined heave dies descending with the blank contact process in, blank generation plastic deformation; When being out of shape at the end, adopt push rod to eject blank;
Gross weight step at the bottom of one train: the blank gross weight behind the one-level ausforming is machined away fully;
Secondary ausforming step: adopt three lobe split combined heave dies that the blank that is arranged in the secondary ausforming mould is carried out backward extrusion; Wherein secondary ausforming mould is inserted with the three lobe splits combination identical with three lobe split combined heave die shapes in being placed on one-level ausforming mould by one-level ausforming mould and is formed; Three lobe split combined heave dies and die are applied lubricant; Then the blank behind the heat tracing is put into concave die cavity, guarantee three lobe through holes of blank and the morpheme position consistency that three lobe splits combination is inserted simultaneously; Three lobe splits combinations is inserted and the staggered 60o of three lobe split combined heave dies is provided with, three lobe split combined heave dies descending with the blank contact process in, blank generation plastic deformation; When being out of shape at the end, adopt push rod to eject blank;
Gross weight step at the bottom of two trains: the workpiece gross weight behind the secondary ausforming is machined away fully.
When said one-level ausforming and secondary ausforming, backward extrusion speed is 5 ~ 15mm/s, and lubricant is a colloidal graphite mixed with water, and the die heating-up temperature is lower 30 ~ 50 ℃ than blank heating temperature.
For preventing the blank grain growth, during said secondary ausforming, blank heating temperature during than the one-level ausforming low 10 ℃.
The present invention has reduced the input of large-tonnage equipment, has improved stock utilization, through the control to raw material tissue, ausforming parameter, heat treatment parameter, has satisfied accessory size and performance indications simultaneously.
Description of drawings
Fig. 1 is the sketch map of part after the one-level ausforming step;
Fig. 2 is the sketch map of part after the gross weight step at the bottom of the train;
Fig. 3 is the sketch map of part after the secondary ausforming step;
Fig. 4 is the sketch map of part after the gross weight step at the bottom of two trains;
Fig. 5 is the sketch map of one-level ausforming mould;
Fig. 6 is the sketch map of mould in the secondary ausforming step;
Fig. 7 is the vertical view of part 1 among Fig. 5.
Among the figure, part 1 is three lobe split combined heave dies, and part 2 is a die, and part 3 is a backing plate, and part 4 is a lower bolster, and part 5 is a push rod, and part 6 is a heating and heat-insulating device, and part 7 is a blank, and part 8 is that three lobe splits combination is inserted.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated, but be not that the present invention is done any qualification.
To shown in Figure 4, a kind of branch class part forming method comprises at the bottom of blanking-car coarse grain ring-one-level ausforming-a train gross weight-six steps of Strengthening and Toughening heat treatment at the bottom of gross weight-secondary ausforming-two train like Fig. 1.
Car coarse grain ring operation is turning to be carried out on the surface of former extruded bars handle, and 7A04 rods and bars of aluminium alloy turning amount is 3 ~ 4mm, and Mg-Gd-Y-Zr magnesium alloy rod turning amount is 2 ~ 3mm.
As shown in Figure 5; One-level ausforming mould comprises die 2; The below of die 2 is disposed with lower bolster 3 and lower bolster 4, and the heating and heat-insulating device 6 that is arranged at the outer of lower bolster 4 surrounds die 2, and push rod 5 passes lower bolster 3 and can contact with blank with lower bolster 4.The external diameter of three lobe split combined heave dies 1 is than the monolateral little 0.5 ~ 1mm of die internal diameter.
Blank is placed in the die 2, and three lobe split combined heave dies 1 from top to bottom push blank, regulate patrix stroke and speed before the shaping, the thickness 6 ~ 8mm of gross weight after the assurance backward extrusion; Adopt 6 pairs of moulds of heating and heat-insulating device to carry out temperature control, the mold heated temperature is lower 30 ~ 50 ℃ than blank heating temperature; Three lobe split combined heave dies 1 and die 2 are applied colloidal graphite mixed with water; Then the blank behind the heat tracing 7 is put into die 2 die cavities, three lobe split combined heave dies 1 descending with blank 7 contact processes in, plastic deformations take place in blank 7; When being out of shape at the end, adopt push rod 5 to eject blank.During the one-level ausforming, for the 7A04 aluminium alloy, blank heating temperature is 400 ~ 420 ℃, and temperature retention time is 3 ~ 3.5h; For the Mg-Gd-Y-Zr magnesium alloy, blank heating temperature is 380 ~ 400 ℃, and temperature retention time is 1.5 ~ 2h.
Gross weight step at the bottom of one train is that the blank gross weight behind the one-level ausforming is machined away fully.
Like Fig. 6 and shown in Figure 7; Mould in the secondary ausforming step; Different with mould in the one-level ausforming step is; Be provided with three lobe splits identical with three lobe split combined heave dies, 1 shape combination, 8, the three lobe splits combination of inserting in the die 2 and insert that to be 60o arranged in a crossed manner for 8 and three lobe split combined heave dies 1, blank is made up to insert by three lobe splits and 8 is fixed in the mould.Regulate patrix stroke and speed before the shaping, guarantee backward extrusion gross weight thickness 6 ~ 8mm; Adopt heating and heat-insulating device that mould is carried out temperature control, the mold heated temperature is lower 30 ~ 50 ℃ than blank heating temperature; Three lobe split combined heave dies 1 and die 2 are applied colloidal graphite mixed with water; Then the blank behind the heat tracing 7 is put into die 2 die cavities, insert 8 morpheme position consistency of three lobe through holes and the three lobe splits combination that guarantees blank 7 simultaneously; Three lobe split combined heave dies 3 descending with blank 7 contact processes in, plastic deformations take place in blank 7; When being out of shape at the end, adopt push rod 5 to eject blank.
During the secondary ausforming, for preventing the blank grain growth, blank heating temperature during than the one-level ausforming low 10 ℃.
Gross weight step at the bottom of two trains is that the blank gross weight behind the secondary ausforming is machined away fully.
The Strengthening and Toughening heat treatment step for the 7A04 aluminium alloy, adopts T6 Strengthening and Toughening Technology for Heating Processing, and promptly 470 ℃ * 3h+140 ℃ * 16h (insulation is 3 hours under 470 ℃ of environment, under 140 ℃ of environment, is incubated 16 hours), Rm (compression strength) reaches more than the 570MPa; For the Mg-Gd-Y-Zr magnesium alloy, adopt T5 Strengthening and Toughening Technology for Heating Processing: 220 ℃ * 20h, Rm reaches more than the 440MPa.
The present invention efficiently solves restriction problems such as medium-and-large-sized aluminium, magnesium alloy branch class part forming difficulty are big, equipment tonnage deficiency, and technology is simple, and the branch class part machinery performance of shaping is good, surface quality is high.

Claims (3)

1. a branch class part forming method comprises blanking, intermediate treatment and three links of Strengthening and Toughening heat treatment, and it is characterized in that: said intermediate treatment link comprises the steps:
Car coarse grain ring step: turning is carried out on the surface of extruded bars handled;
One-level ausforming step: adopt three lobe split combined heave dies (1) that the blank that is arranged in the one-level ausforming mould is carried out backward extrusion; Wherein three lobe split combined heave dies (1) are made up of three punch that are 120o; One-level ausforming mould comprises die (2); The below of die (2) is disposed with lower bolster (3) and lower bolster (4); The heating and heat-insulating device (6) that is arranged at the outer of lower bolster (4) surrounds die (2), and push rod (5) passes lower bolster (3) and lower bolster (4) can contact with blank; Three lobe split combined heave dies (1) and die (2) are applied lubricant; Then the blank behind the heat tracing (7) is put into die (2) die cavity, three lobe split combined heave dies (1) descending with blank (7) contact process in, plastic deformation takes place in blank (7); When being out of shape at the end, adopt push rod (5) to eject blank;
Gross weight step at the bottom of one train: the blank gross weight behind the one-level ausforming is machined away fully;
Secondary ausforming step: adopt three lobe split combined heave dies (1) that the blank that is arranged in the secondary ausforming mould is carried out backward extrusion; Wherein secondary ausforming mould by one-level ausforming mould and the combination of the three lobe splits identical in being placed on one-level ausforming mould with three lobe split combined heave die (1) shapes insert (8) form; Three lobe split combined heave dies (1) and die (2) are applied lubricant; Then the blank behind the heat tracing (7) is put into die (2) die cavity, the insert morpheme position consistency of (8) of three lobe through holes and the three lobe splits combination that guarantees blank (7) simultaneously; Three lobe splits combinations insert (8) be provided with the staggered 60o of three lobe split combined heave dies (1), three lobe split combined heave dies (3) descending with blank (7) contact process in, plastic deformation takes place in blank (7); When being out of shape at the end, adopt push rod (5) to eject blank;
Gross weight step at the bottom of two trains: the workpiece gross weight behind the secondary ausforming is machined away fully.
2. branch class part forming method as claimed in claim 1; It is characterized in that: when said one-level ausforming and secondary ausforming; Backward extrusion speed is 5 ~ 15mm/s, and lubricant is a colloidal graphite mixed with water, and the die heating-up temperature is lower 30 ~ 50 ℃ than blank heating temperature.
3. branch class part forming method as claimed in claim 2 is characterized in that: during said secondary ausforming, and blank heating temperature during than the one-level ausforming low 10 ℃.
CN 201110297252 2011-09-29 2011-09-29 Forming method for branch type parts CN102303061B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106424182A (en) * 2014-03-19 2017-02-22 泉州市洛江双阳高捷机动车零部件电脑设计工作室 Radial extruding and positioning method for part with cup-shaped bottom hole

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6326217A (en) * 1986-07-18 1988-02-03 Showa Alum Corp Duplex type extrusion forming method for metal extrusion die and dies for its forming
EP1430965A2 (en) * 2002-11-01 2004-06-23 Sumitomo Light Metal Industries, Ltd. Method of manufacturing high-strength aluminium alloy extruded product excelling in corrosion resistance and stress corrosion cracking resistance
JP2006142325A (en) * 2004-11-17 2006-06-08 Kobe Steel Ltd Bridge die for extruding aluminum alloy shape
CN101099979A (en) * 2007-07-27 2008-01-09 重庆工学院 Projective table type composite extruding precision punching forming mould

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6326217A (en) * 1986-07-18 1988-02-03 Showa Alum Corp Duplex type extrusion forming method for metal extrusion die and dies for its forming
EP1430965A2 (en) * 2002-11-01 2004-06-23 Sumitomo Light Metal Industries, Ltd. Method of manufacturing high-strength aluminium alloy extruded product excelling in corrosion resistance and stress corrosion cracking resistance
JP2006142325A (en) * 2004-11-17 2006-06-08 Kobe Steel Ltd Bridge die for extruding aluminum alloy shape
CN101099979A (en) * 2007-07-27 2008-01-09 重庆工学院 Projective table type composite extruding precision punching forming mould

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106424182A (en) * 2014-03-19 2017-02-22 泉州市洛江双阳高捷机动车零部件电脑设计工作室 Radial extruding and positioning method for part with cup-shaped bottom hole
CN106424182B (en) * 2014-03-19 2018-05-01 泉州市洛江双阳高捷机动车零部件电脑设计工作室 Localization method is squeezed in a kind of cupulate bottom outlet part footpath

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