CN104200037A - Method for designing forming dies for low-double-curvature sheet metal parts - Google Patents

Abstract

The invention relates to a method for designing forming dies for low-double-curvature sheet metal parts. The method includes steps of 1), initially designing four-piece integrated forming die profiles; 2), preliminarily simulating deep drawing forming technologies; 3), judging the rationality of die design technologies; 4), simulating deep drawing forming and spring-back technologies in detail; 5), computing and outputting spring-back compensation on the die profiles; 6), performing solid modeling on the dies in three-dimensional design software. The method has the advantages that all the four-piece double-curvature parts can be formed at one step by the aid of a deep drawing forming process, accordingly, the forming efficiency can be improved, the parts are low in spring-back rate, and the quality of the parts can be guaranteed.

Description

A kind of die design method of little Double curve degree sheet metal component

Technical field

The present invention relates to a kind of die design method of little Double curve degree sheet metal component, belong to metal blank Plastic Forming field.

Background technology

This sheet metal component single-piece has minimum Double curve degree, and on single airplane, have four similar parts of shape to form a circle, on assembly relation, belong to the slightly larger Double curve degree curved surface of same curvature, the technique that this part now adopts is that method is that minute single-piece is carried out rubber pocket hydroforming and the manual mode that school shape is combined of repairing of striking, rubber pocket hydroforming refers to hydraulic pressure rubber pocket as general punch (or die), the method that metal blank is shaped according to rigidity punch (or die), in forming process, rubber pocket is pressure transmitting medium, also play the effect of half module, belong to flexible forming, but there is following problem in this part in forming process:

1, blank location difficulty, when rubber pocket presses down, plate is easier to be moved, and geometric configuration is difficult to assurance, and rejection rate is high;

2,, because Double curve degree is too little, material experience elastic deformation has just entered plastic period and has produced after minimum distortion, rubber pocket discharge degree, and plate produces serious resilience thereupon, and each several part resilience is inhomogeneous, irregular;

3, after shaping, each part needs to carry out manual school shape to pasting mould, and manual operation workload is huge, and surface quality of workpieces is poor, and production efficiency is low.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of die design method of little Double curve degree sheet metal component.The method adopts drawing forming method, and whole four the Double curve degree parts of once-forming, not only improve forming efficiency, and the rebound degree of part are little, have guaranteed the quality of part.

For overcoming the above problems, concrete technical scheme of the present invention is as follows: a kind of die design method of little Double curve degree sheet metal component, comprises the following steps:

1) initial designs die face: in Three-dimensional Design Software, four little Double curve degree sheet metal components are pressed to assembly relation combination, and be positioned on same large Double curve degree face, this Double curve degree face is for the mould of drawing and forming, and as the die bottom surface of Drawing Die, i.e. the bottom using the curved surface of four one as a box part, bottom outer rim is process allowance, the violent position of attenuate, box part bottom is controlled within the scope of process allowance, must not affects the active component of part;

2) preliminary drawing and forming process simulation: for the die of design, utilize Three-dimensional Design Software to generate corresponding punch surface according to die with part wall thickness and blank holder carries out drawing and forming process simulation;

3) Design of Dies process rationality judgement: judge according to preliminary drawing and forming process simulation result whether plate size meets the demands, be that plate can be configured as complete box part, whether mould process surplus is reasonable, it is the live part that the weakened region of four jiaos of box parts does not affect part, if meet the demands, carry out step 4, if do not meet, return to step 1 and adjust mould and plate according to simulation result, until Design of Dies is reasonable;

4) in detail drawing and forming and resilience process simulation: optimization blank shape size and technological parameter, make material flow deformation smooth, do not produce drawing crack and the defect such as wrinkling, the thinner rate of plate is as far as possible little;

5) die face is carried out to springback compensation calculating output: the springback compensation that die face is carried out calculates and uses automatic die face compensating module, and according to result of calculation, the IGS formatted file of the die face after output springback compensation calculates;

6) in Three-dimensional Design Software, carry out the solid modelling of mould.

The beneficial effect of the die design method of the application's little Double curve degree sheet metal component:

1) adopt the mould of the method design when drawing and forming, once-forming can meet the once demand of assembling.Plate location is relatively easy, and because the curved surface curvature of four one is greater than the curvature of single-piece curved surface, be equivalent to increase the plastic yield of plate, and the form of distortion of plate changes, by an original almost compression chord, become the stretching plastic deformation who has increased box part bottom, resilience reduces relatively;

2) adopted CAD to design the method for applying of being combined with CAE Finite Element Numerical Simulation, the technological parameter of optimization used when rational how much foundations being provided and being shaped for Design of Dies by numerical simulation result, the efficiency that has effectively improved design shortens the design cycle, for actual production provides guidance;

3) by die face being carried out to springback compensation calculating in design software Finite Element Numerical Simulation, in die design stage, solve part forming resilience problem, the part going out according to the die forming of the method manufacture farthest approaches the theoretical size that digital-to-analogue requires, and greatly reduces the workload of artificial school shape.

Accompanying drawing explanation

Fig. 1 is the process flow diagram of the die design method of little Double curve degree sheet metal component.

Fig. 2 is the assembling schematic diagram of four little curvature sheet metal parts.

Fig. 3 is the plate schematic diagram in step 1.

Fig. 4 is the Drawing Die moulding finite element model of final design.

Fig. 5 is drawing and forming process simulation result schematic diagram.

The little curvature sheet metal part, 5 that wherein 1-4 is respectively different is that punch, 6 is that die, 7 is that plate, 8 is blank holder.

Embodiment

A die design method for little Double curve degree sheet metal component, as shown in Figure 1, comprises the following steps:

1) initial designs die face: the Three-dimensional Design Software adopting in the present embodiment is CATIA V5, four little Double curve degree sheet metal components are as shown in Figure 2 pressed to assembly relation combination, material is aluminium alloy 2B06, O state, thickness is δ 1mm, and four Assembly of the parts relations are positioned on same large Double curve degree face; This Double curve degree face is for the mould of drawing and forming, and as the die bottom surface of Drawing Die, the i.e. bottom using the curved surface of four one as a box part, bottom outer rim is process allowance, the violent position of attenuate, box part bottom is controlled within the scope of process allowance, must not affects the active component of part;

2) preliminary drawing and forming process simulation: for the die of design, utilize Three-dimensional Design Software to generate corresponding punch surface and flanging according to die and part wall thickness and enclose the land and can carry out drawing and forming process simulation; The PAMSTAMP 2G software adopting in this embodiment, the major parameter that analog computation adopts is:

Friction factor between punch and plate: 0.12;

Die and sheet blanks friction factor: 0.12;

Friction factor between blank holder and plate: 0.12;

The grid of the objects such as punch, die, blank holder and plate adopts self-adaptation dividing mode;

The definition of plate material: aluminium alloy 2B06, O state, thickness is δ 1mm, orthotropic material model, the some junction curve that stress-strain diagram adopts one directional tensile test to obtain;

Punch and matrix and blank holder are regarded as rigid body, and after all properties has been set, pre-treatment finishes, and submit to and solve calculating;

3) Design of Dies process rationality judgement: judge according to preliminary drawing and forming process simulation result whether plate size meets the demands, be that plate can be configured as complete box part, whether mould process surplus is reasonable, it is the live part that the weakened region of four jiaos of box parts does not affect part, if meet the demands, carry out step 4, if do not meet, return to step 1 and adjust mould and plate according to simulation result, until Design of Dies is reasonable;

4) in detail drawing and forming and resilience process simulation: optimization blank shape size as shown in Figure 3 with technological parameter, the afterburning 100KN of flanging, punch downstream rate 5mm/s, final finite element model as shown in Figure 4, make material flow deformation smooth, do not produce drawing crack and the defect such as wrinkling, the thinner rate of plate is as far as possible little; Result after shaping sunykatuib analysis as shown in Figure 5, is 1/4th of box part, and box part forming quality is good, the abundant refinement of grid of part live part.The demonstration of aftertreatment result, the most violent position of box part attenuate appears at four jiaos of bottoms, and wall thickness is 0.931mm, and within the scope of process allowance, and the minimum wall thickness (MINI W.) of part effective coverage is 0.992mm, meets designing requirement completely;

5) die face is carried out to springback compensation calculating output: the springback compensation that die face is carried out calculates and uses automatic die face compensating module, and according to result of calculation, the IGS formatted file of the die face after output springback compensation calculates;

6) in Three-dimensional Design Software, carry out the solid modelling of mould.

Claims (1)

1. a die design method for little Double curve degree sheet metal component, is characterized in that comprising the following steps:

1) initial designs die face: in Three-dimensional Design Software, four little Double curve degree sheet metal components are pressed to assembly relation combination, and be positioned on same large Double curve degree face, this Double curve degree face is for the mould of drawing and forming, and as the die bottom surface of Drawing Die, i.e. the bottom using the curved surface of four one as a box part, bottom outer rim is process allowance, the violent position of attenuate, box part bottom is controlled within the scope of process allowance, must not affects the active component of part;

2) preliminary drawing and forming process simulation: for the die of design, utilize Three-dimensional Design Software to generate corresponding punch surface according to die with part wall thickness and blank holder carries out drawing and forming process simulation;

3) Design of Dies process rationality judgement: judge according to preliminary drawing and forming process simulation result whether plate size meets the demands, be that plate can be configured as complete box part, whether mould process surplus is reasonable, it is the live part that the weakened region of four jiaos of box parts does not affect part, if meet the demands, carry out step 4, if do not meet, return to step 1 and adjust mould and plate according to simulation result, until Design of Dies is reasonable;

4) in detail drawing and forming and resilience process simulation: optimization blank shape size and technological parameter, make material flow deformation smooth, do not produce drawing crack and the defect such as wrinkling, the thinner rate of plate is as far as possible little;

5) die face is carried out to springback compensation calculating output: the springback compensation that die face is carried out calculates and uses automatic die face compensating module, and according to result of calculation, the IGS formatted file of the die face after output springback compensation calculates;

6) in Three-dimensional Design Software, carry out the solid modelling of mould.