CN101537453A - Pressure control method for forming aluminum alloy covering part viscoelastic-plastic soft mode - Google Patents
Pressure control method for forming aluminum alloy covering part viscoelastic-plastic soft mode Download PDFInfo
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- CN101537453A CN101537453A CN200910071760A CN200910071760A CN101537453A CN 101537453 A CN101537453 A CN 101537453A CN 200910071760 A CN200910071760 A CN 200910071760A CN 200910071760 A CN200910071760 A CN 200910071760A CN 101537453 A CN101537453 A CN 101537453A
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Abstract
The invention discloses a pressure control method for forming an aluminum alloy covering part viscoelastic-plastic soft mode, relating to the pressure control method for forming an aluminum alloy covering part soft mode. The invention solves the problems of local tinning and cracking, larger rebound, bad surface quality and higher manufacture cost which are existed in the prior aluminum alloy covering part. The invention substantially comprises the following steps of: shaping a mould; installing a piston and an overflow valve; filling viscoelastic-plastic materials; matching a mould; adjusting the overflow valve to control the pressure value of the deformed region of the aluminum alloy plate blank material; tightly gluing the aluminum alloy plate blank material with the die cavity of a cavity die under the thrusting function of the viscoelastic-plastic materials to form the needed aluminum alloy covering part; opening the mould; taking out the formed aluminum alloy covering part; and removing the viscoelastic-plastic materials remained on the surface of the aluminum alloy covering part. The invention inhibits the rebound of the formed aluminum alloy covering part, prevents the local region from being cracked, improves the surface quality of the aluminum alloy covering part, and reduces the manufacture cost of the aluminum alloy covering part.
Description
Technical field
The present invention relates to a kind of compress control method of aluminum alloy covering part flexible die forming, belong to the sheet material forming technical field.
Background technology
Aluminum alloy plate materials is one of material of auto industry field use, in order to realize body of a motor car quantification in light weight, in order to improve vehicle operation performance and security performance, the body of a motor car part gradually adopts aluminum alloy materials, especially automobile body covering piece uses aluminum alloy materials, the dimensional accuracy of covering and Thickness Distribution have significant effects to its serviceability, therefore forming technique are had higher requirement.Be easy to generate serious local attenuation cracking when adopting traditional firm contour forming method to make aluminum alloy covering part, and there is bigger resilience in the covering after being shaped; Need heat and select suitable shaping rate when adopting hot forming, and suitable temperature and shaping rate are restive, make that the surface quality of sheet material is poor, and manufacturing cost is higher.
Summary of the invention
The objective of the invention is that local attenuation cracking, resilience that existing aluminum alloy covering part exists in being shaped are big in order to solve, surface quality difference and manufacturing cost problem of higher, and then provide a kind of compress control method of forming aluminum alloy covering part viscoelastic-plastic soft mode.
The step of the compress control method of a kind of forming aluminum alloy covering part viscoelastic-plastic soft mode of the present invention is:
Step 1: die modeling at first, then grinding and buffing is carried out on the concave die cavity surface of mould, apply releasing agent at the patrix mold cavity surface, on the upper surface of the counterdie of mould, offer the pressure storehouse then, offer the movable chamber of a plurality of pistons and a plurality of spill cavity on the bottom surface of counterdie, the movable chamber of piston is communicated with the pressure storehouse, and spill cavity is communicated with the movable chamber of piston;
Step 2: a plurality of pistons are installed in the movable chamber of piston, a plurality of overflow valves are installed in the port of export of spill cavity;
Step 3: will fill full viscoplasticity plastic material in pressure storehouse, the movable chamber of piston and a plurality of spill cavity;
Step 4: the aluminium alloy plate blank is placed on the upper surface of counterdie, die is moved down is pressed on the aluminium alloy plate blank, and apply the pressure-pad-force of 1MPa～10MPa, close die, the die cavity that guarantees die simultaneously is towards the below and corresponding with the pressure storehouse of counterdie;
Step 5: a plurality of pistons produce thrust and upwards promote viscoelastoplastic material, and the force value that makes the aluminium alloy plate blank be out of shape big zone by the adjusting overflow valve reaches 40MPa～58MPa, the force value of being out of shape little zone reaches 26MPa～40MPa, and the aluminium alloy plate blank tightly sticks to form out needed aluminum alloy covering part with the die cavity of die under the thrust of viscoelastoplastic material;
Step 6: a plurality of pistons are moved down die sinking, make the pressure in the pressure storehouse reduce to 0MPa, die is moved up, take out the aluminum alloy formed covering;
Step 7: the viscoelastoplastic material of removing the aluminum alloy covering part remained on surface.
The present invention has following beneficial effect: the present invention has adopted flexible die forming method, rather than the firm die stamping shaping of traditional room temperature, neither hot forming.The present invention as the power transmission medium, can make full use of the good characteristics of its high pressure current downflow by viscoelastoplastic material, and the semisolid medium seals easily, therefore more easily sets up high pressure in die cavity, and aluminum alloy covering part can be shaped.Viscoelastoplastic material has higher sensitivity of strain rate, can set up pressure distribution heterogeneous at aluminum alloy sheet material surface, be adapted to the variation of aluminum alloy plate materials deformation process stress, the resilience of the aluminum alloy covering part after suppressing to be shaped, by regulating the pressure of overflow valve subregion control viscoelastoplastic material, promoted aluminum alloy plate materials to flow effectively to the big zone of distortion, improve the uniformity of formation of parts Thickness Distribution, prevent breaking of regional area, improve the aluminum alloy covering part surface quality, reduced the manufacturing cost of aluminum alloy covering part simultaneously.
Description of drawings
Fig. 1 is the cutaway view of aluminum alloy covering part shaping original state and mould structure, Fig. 2 is the mould structure cutaway view when loading viscoelastoplastic material by piston, Fig. 3 is the mould structure cutaway view of aluminium alloy plate blank when pasting mould fully, and Fig. 4 is the structure cutaway view behind unloading viscoelastoplastic material and the opening mold.
The specific embodiment
The specific embodiment one: in conjunction with Fig. 1～Fig. 4 present embodiment is described, the step of the compress control method of a kind of forming aluminum alloy covering part viscoelastic-plastic soft mode of present embodiment is:
Step 1: die modeling at first, die 1 mold cavity surface to mould carries out grinding and buffing then, apply releasing agent at the patrix mold cavity surface, on the upper surface of the counterdie 7 of mould, offer pressure storehouse 4 then, offer the movable chamber 8 of a plurality of pistons and a plurality of spill cavity 9 on the bottom surface of counterdie 7, the movable chamber 8 of piston is communicated with pressure storehouse 4, and spill cavity 9 is communicated with the movable chamber 8 of piston;
Step 2: a plurality of pistons 6 are installed in the movable chamber 8 of piston, a plurality of overflow valves 5 are installed in the port of export of spill cavity 9;
Step 3: will fill full viscoplasticity plastic material 3 in pressure storehouse 4, the movable chamber 8 of piston and a plurality of spill cavity 9;
Step 4: aluminium alloy plate blank 2 is placed on the upper surface of counterdie 7, die 1 moved down be pressed on the aluminium alloy plate blank 2, and apply the pressure-pad-force of 1MPa～10MPa, and close die, the die cavity that guarantees die 1 simultaneously is towards the below and corresponding with the pressure storehouse 4 of counterdie 7;
Step 5: a plurality of pistons 6 produce thrust and upwards promote viscoelastoplastic material 3, and the force value that makes aluminium alloy plate blank 2 be out of shape big zone by adjusting overflow valve 5 reaches 40MPa～58MPa, the force value of being out of shape little zone reaches 26MPa～40MPa, and aluminium alloy plate blank 2 tightly sticks to form out needed aluminum alloy covering part with the die cavity of die 1 under the thrust of viscoelastoplastic material 3;
Step 6: a plurality of pistons 6 are moved down die sinking, make the pressure in the pressure storehouse 4 reduce to 0MPa, die 1 is moved up, take out the aluminum alloy formed covering;
Step 7: the viscoelastoplastic material 3 of removing the aluminum alloy covering part remained on surface.
The specific embodiment two: the difference of the present embodiment and the specific embodiment one is: the releasing agent in the step 1 of present embodiment is no wax release agent.Make that the surface quality of aluminum alloy covering part is better, be easier to the demoulding.
The specific embodiment three: present embodiment and the specific embodiment one or twos' difference is: the viscoplasticity plastic material 3 in the step 3 of present embodiment is that 400000g/mol～600000g/mol, viscosity are the macromolecule polymer material of 10000Pas～16000Pas for molecular weight, and the states of matter of viscoplasticity plastic material 3 is a semisolid.The sensitivity of strain rate of viscoelastoplastic material is better, more is adapted to the variation of aluminum alloy plate materials deformation process stress, the resilience of the aluminum alloy covering part after better having suppressed to be shaped.
The specific embodiment four: the difference of the present embodiment and the specific embodiment three is: the thickness of the aluminium alloy plate blank 2 in the step 4 of present embodiment is between 0.8mm～1.5mm.The shaping rate of aluminum alloy covering part is higher.
The specific embodiment five: the difference of the present embodiment and the specific embodiment one is: the force value in the zone that aluminium alloy plate blank 2 distortion in the step 5 of present embodiment are big reaches 45MPa～56MPa, is out of shape little areal pressure value and reaches 27MPa～33MPa.Be particularly suitable for the thick 5182-O aluminium alloy plate blank of 1mm.
The specific embodiment six: the difference of the present embodiment and the specific embodiment one is: the force value in the zone that aluminium alloy plate blank 2 distortion in the step 5 of present embodiment are big reaches 40MPa～48MPa, is out of shape little areal pressure value and reaches 26MPa～30MPa.Be particularly suitable for the thick 6016-T4 aluminium alloy plate blank of 1mm.
The specific embodiment seven: the difference of the present embodiment and the specific embodiment one is: the force value in the zone that aluminium alloy plate blank 2 distortion in the step 5 of present embodiment are big reaches 50MPa～58MPa, is out of shape little areal pressure value and reaches 30MPa～35MPa.Be particularly suitable for the thick 6111-T4 aluminium alloy plate blank of 1mm.
Claims (7)
1, a kind of compress control method of forming aluminum alloy covering part viscoelastic-plastic soft mode is characterized in that steps of the method are:
Step 1: die modeling at first, die (1) mold cavity surface to mould carries out grinding and buffing then, apply releasing agent at the patrix mold cavity surface, on the upper surface of the counterdie (7) of mould, offer pressure storehouse (4) then, offer the movable chamber (8) of a plurality of pistons and a plurality of spill cavity (9) on the bottom surface of counterdie (7), the movable chamber of piston (8) is communicated with pressure storehouse (4), and spill cavity (9) is communicated with the movable chamber of piston (8);
Step 2: a plurality of pistons (6) are installed in the movable chamber of piston (8), a plurality of overflow valves (5) are installed in the port of export of spill cavity (9);
Step 3: will fill full viscoplasticity plastic material (3) in pressure storehouse (4), the movable chamber (8) of piston and a plurality of spill cavity (9);
Step 4: aluminium alloy plate blank (2) is placed on the upper surface of counterdie (7), die (1) moved down be pressed on the aluminium alloy plate blank (2), and apply the pressure-pad-force of 1MPa～10MPa, close die, the die cavity that guarantees die (1) simultaneously are towards the below and corresponding with the pressure storehouse (4) of counterdie (7);
Step 5: a plurality of pistons (6) produce thrust and upwards promote viscoelastoplastic material (3), and the force value that makes aluminium alloy plate blank (2) be out of shape big zone by adjusting overflow valve (5) reaches 40MPa～58MPa, the force value of being out of shape little zone reaches 26MPa～40MPa, and aluminium alloy plate blank (2) tightly sticks to form out needed aluminum alloy covering part with the die cavity of die (1) under the thrust of viscoelastoplastic material (3);
Step 6: a plurality of pistons (6) are moved down, make the pressure in the pressure storehouse (4) reduce to 0MPa,, take out the aluminum alloy formed covering with die (1) die sinking that moves up;
Step 7: the viscoelastoplastic material (3) of removing the aluminum alloy covering part remained on surface.
2, according to the compress control method of the described a kind of forming aluminum alloy covering part viscoelastic-plastic soft mode of claim 1, it is characterized in that: the releasing agent in the described step 1 is no wax release agent.
3, according to the compress control method of claim 1 or 2 described a kind of forming aluminum alloy covering part viscoelastic-plastic soft modes, it is characterized in that: the viscoplasticity plastic material (3) in the described step 3 is that 400000g/mol～600000g/mol, viscosity are the macromolecule polymer material of 10000Pas～16000Pas for molecular weight, and the states of matter of viscoplasticity plastic material (3) is a semisolid.
4, according to the compress control method of the described a kind of forming aluminum alloy covering part viscoelastic-plastic soft mode of claim 3, it is characterized in that: the thickness of the aluminium alloy plate blank (2) in the described step 4 is between 0.8mm～1.5mm.
5, according to the compress control method of the described a kind of forming aluminum alloy covering part viscoelastic-plastic soft mode of claim 1, it is characterized in that: the force value in the zone that aluminium alloy plate blank (2) distortion in the described step 5 is big reaches 45MPa～56MPa, is out of shape little areal pressure value and reaches 27MPa～33MPa.
6, according to the compress control method of the described a kind of forming aluminum alloy covering part viscoelastic-plastic soft mode of claim 1, it is characterized in that: the force value in the zone that aluminium alloy plate blank (2) distortion in the described step 5 is big reaches 40MPa～48MPa, is out of shape little areal pressure value and reaches 26MPa～30MPa.
7, according to the compress control method of the described a kind of forming aluminum alloy covering part viscoelastic-plastic soft mode of claim 1, it is characterized in that: the force value in the zone that aluminium alloy plate blank (2) distortion in the described step 5 is big reaches 50MPa～58MPa, is out of shape little areal pressure value and reaches 30MPa～35MPa.
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Cited By (9)
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| CN101829732A (en) * | 2010-04-15 | 2010-09-15 | 重庆理工大学 | Solid particle male die forming mold with movable brake beads and radial thrust |
| CN102120235A (en) * | 2010-12-14 | 2011-07-13 | 吉林大学 | Liquid-filled pad for multipoint stretch forming |
| CN108188247A (en) * | 2018-03-05 | 2018-06-22 | 陕西科技大学 | A kind of subregion soft mode regulation and control plank precision forming device and method |
| CN109365592A (en) * | 2018-10-25 | 2019-02-22 | 福建泉州洛江振丰模配制造有限公司 | A kind of colloid fluid die pressing molding device and the method using its molding plate |
| CN109675998A (en) * | 2019-01-23 | 2019-04-26 | 哈尔滨工业大学 | A kind of viscous pressure forming method of local curvature's mutation sheet cover |
| CN110216184A (en) * | 2019-06-27 | 2019-09-10 | 福建省恒业金属门窗制造有限公司 | A kind of door body molding machine |
| CN112139340A (en) * | 2020-09-14 | 2020-12-29 | 哈尔滨工业大学 | Aluminum alloy component ultralow-temperature forming device and forming method |
| CN112917988A (en) * | 2021-02-10 | 2021-06-08 | 哈尔滨工业大学 | Non-uniform pressure control method for composite viscous medium |
| CN112916640A (en) * | 2021-02-10 | 2021-06-08 | 哈尔滨工业大学 | Method for forming metal step part by adopting viscous medium and forming die set |
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| CN1290636C (en) * | 2004-12-22 | 2006-12-20 | 重庆工学院 | Sheet bar reciprocating type forming method based on force transferring by viscoelastic medium |
| CN2787326Y (en) * | 2005-05-25 | 2006-06-14 | 重庆工学院 | Sheet material forming die based on pressure transmission of viscoelastic medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101829732A (en) * | 2010-04-15 | 2010-09-15 | 重庆理工大学 | Solid particle male die forming mold with movable brake beads and radial thrust |
| CN102120235A (en) * | 2010-12-14 | 2011-07-13 | 吉林大学 | Liquid-filled pad for multipoint stretch forming |
| CN102120235B (en) * | 2010-12-14 | 2012-07-04 | 吉林大学 | Liquid-filled pad for multipoint stretch forming |
| CN108188247B (en) * | 2018-03-05 | 2019-08-06 | 陕西科技大学 | A kind of subregion soft mode regulation plate precision forming device and method |
| CN108188247A (en) * | 2018-03-05 | 2018-06-22 | 陕西科技大学 | A kind of subregion soft mode regulation and control plank precision forming device and method |
| CN109365592A (en) * | 2018-10-25 | 2019-02-22 | 福建泉州洛江振丰模配制造有限公司 | A kind of colloid fluid die pressing molding device and the method using its molding plate |
| CN109365592B (en) * | 2018-10-25 | 2023-11-17 | 福建振丰矿物新材料有限公司 | Colloid hydraulic compression molding device and method for molding plate by using colloid hydraulic compression molding device |
| CN109675998A (en) * | 2019-01-23 | 2019-04-26 | 哈尔滨工业大学 | A kind of viscous pressure forming method of local curvature's mutation sheet cover |
| CN109675998B (en) * | 2019-01-23 | 2020-02-07 | 哈尔滨工业大学 | Viscous medium pressure forming method for local curvature abrupt change thin-wall covering part |
| CN110216184A (en) * | 2019-06-27 | 2019-09-10 | 福建省恒业金属门窗制造有限公司 | A kind of door body molding machine |
| CN112139340A (en) * | 2020-09-14 | 2020-12-29 | 哈尔滨工业大学 | Aluminum alloy component ultralow-temperature forming device and forming method |
| CN112917988A (en) * | 2021-02-10 | 2021-06-08 | 哈尔滨工业大学 | Non-uniform pressure control method for composite viscous medium |
| CN112916640A (en) * | 2021-02-10 | 2021-06-08 | 哈尔滨工业大学 | Method for forming metal step part by adopting viscous medium and forming die set |
| CN112917988B (en) * | 2021-02-10 | 2022-01-07 | 哈尔滨工业大学 | Non-uniform pressure control method for composite viscous medium |
| CN112916640B (en) * | 2021-02-10 | 2022-01-07 | 哈尔滨工业大学 | Method for forming metal step part by adopting viscous medium and forming die set |
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