CN105107909A - Sheet metal plasticity compound bulge forming method - Google Patents
Sheet metal plasticity compound bulge forming method Download PDFInfo
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- CN105107909A CN105107909A CN201510560020.9A CN201510560020A CN105107909A CN 105107909 A CN105107909 A CN 105107909A CN 201510560020 A CN201510560020 A CN 201510560020A CN 105107909 A CN105107909 A CN 105107909A
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Abstract
The invention discloses a sheet metal plasticity compound bulge forming method, and belongs to the technical field of sheet metal plastic processing forming. The forming method comprises the steps of: first utilizing bulging to preform the sheet metal, calculating the depth of bulging based on the size of a forming angle, and placing the sheet metal which is preformed to a NCincremental sheet metal forming machine tool for processing and forming. The compound forming method is a combination of digitalized sheet metal NC incremental forming technology and traditional spherical bulging forming technology, and achieves special forming effect through advantage complementing. Experimentsshow that, the compound forming method, which is achieved by combining the spherical bulging and sheet metal NC incremental forming, can effectivelysolve the technical problems of overlong processing time of sheet metal plastic forming, and the difficulty of forming parts with large forming angles, especially the difficulty of forming parts with large forming angles.The forming method of the invention has explicit technical advantages over other compound forming methods.
Description
Technical field:
The invention belongs to Metal Forming field shaping technique, be specifically related to the swollen type manufacturing process of a kind of sheet metal plasticity compound.
Background technology:
Plate Metal CNC Incremental Forming technology is a kind of Flexible Manufacture forming technique of just having risen in the world, RP technique and plastic forming technology organically combine by it, relate to the multi-disciplinary advanced intelligent manufacturing technologies such as mechanics, plastic forming technology, Numeric Control Technology, CAD/CAM.The significant advantage of this technology is as a kind of Flexible Manufacturing Technology, without the need to using particular manufacturing craft or only needing simple mould, namely can go out at regional area internal shaping the complex-curved shape that conventional manufacturing process cannot be shaped; Plastic force simultaneously required for partial plastic forming is little, and equipment energy consumption is low, be similar to static pressure, vibrate little, noise is low, so belong to green processing.Its three-dimensional manufacture, process planning, forming process simulation, forming process control etc. are all completed by computer, and CAD/CAM integration manufactures, and automaticity is high.
Plate Metal CNC Incremental Forming technology introduces the thought of Layered manufacturing in RP technique, the three-dimensional digital model of complexity is separated into many sectional layers along short transverse, and the machining locus generated on each sectional layer, forming tool moves along machining locus under the control of the computer, make plate along the track enveloping surface progressive forming of forming tool, namely the enveloping surface formed with the movement locus of forming tool is to replace the profile of mould, replace monolithic molding to carry out successively partial plastic forming to plate, sheet forming is target product the most at last.
Plate Metal CNC Incremental Forming technique and traditional plate forming technology are as compared with drawing, bulging, and its advantage achieves mouldless shaping, do not need mould or only need simple mould, saved the expense of Making mold, reduced production cost; What eliminate mould manufactures and designs the time, shortens from product design to manufacturing cycle, shortens the reaction time of product to the market demand, is easy to quick manufacture; What plate Metal CNC Incremental Forming technology adopted is pointwise progressive molding, can carry out pointwise control to sheet metal deformation, relies on the accumulation of distortion to be finally shaped, and the forming property of material more can be utilized fully to be shaped the larger part of deformation extent.
The shortcoming of plate Metal CNC Incremental Forming technique is not suitable for large batch of production, this needs clamping to fix plate mainly due to processing each product in forming process, in addition machine tooling forming speed is unsuitable too fast, needs the speed of shaping to be limited in certain zone of reasonableness.Above-mentioned factor causes the molded part time longer, is not suitable for large batch of production; Plate specification for plate Metal CNC Incremental Forming has certain restriction, and due to the plastic force restriction that present stage can bear for the machine tool chief axis be shaped, the thickness of plate is unsuitable excessive.
Along with the develop rapidly of modern industry, the demand of Sheet metal forming part is increasing, and sheet forming technology there has also been new progress.Comprise contour peening at present, be shaped shape, laser forming etc. hammer out, and combined shaping method has the manufacturing process of plate multi-point forming and Metal CNC Incremental Forming compound, the pull-shaped combined shaping method etc. combined with Metal CNC Incremental Forming.
Summary of the invention:
The present invention is directed to the technical disadvantages that prior art exists, provide a kind of sheet metal plasticity compound swollen type manufacturing process.This combined shaping method is combined at digital forming technology (plate Metal CNC Incremental Forming) and conventional forming techniques (ball-type bulging), reached special forming effect by both mutual supplement with each other's advantages.
The combined shaping method that sheet metal ball-type bulging provided by the present invention and plate Metal CNC Incremental Forming combine, first utilize bulging to carry out preform to sheet metal, the degree of depth of bulging calculates according to the size of forming angle.Requirement according to molded part carries out machining locus programming in advance in UG software, the NC code generated imports in Digit Control Machine Tool, then shape on plate Metal CNC Incremental Forming lathe there is preformed sheet metal, great many of experiments shows, the combined shaping method that ball-type bulging and plate Metal CNC Incremental Forming combine compares the method for other combined shapings, can effectively improve sheet metal Plastic Forming long for process time, and the problem of the large forming angle part difficulty that is shaped, especially to the part of the large forming angle that is shaped, compare other combined shaping method and there is significant technical advantage.
A kind of sheet metal plasticity compound provided by the present invention swollen type manufacturing process concrete steps are as follows:
(1), under sheet metal to be formed being fixed on sheet-metal press working machine, operation plate stamping machine makes blank holder rise, and sheet metal surrounding is compressed.
(2) in advance the degree of depth of sheet metal ball-type bulging is calculated according to model, then on sheet-metal press working machine, the degree of depth of sheet metal ball-type bulging is set; The degree of depth of described sheet metal ball-type bulging is according to following model specification:
Wherein: the degree of depth of H-ball-type bulging, unit: cm;
The forming angle of θ-workpiece, angle adopts Circular measure;
λ-proportionality coefficient, gets 10 ~ 12.
(3) in advance the diameter of sheet metal ball-type bulging is calculated according to model, on sheet-metal press working machine, then select the drift of respective diameters.
Described in step (3), the diameter of sheet metal ball-type bulging is according to model specification below:
Wherein: the diameter of D-ball-type bulging, unit: cm;
The degree of depth of H-ball-type bulging, unit: cm;
The forming angle of θ-workpiece, angle adopts Circular measure;
K-bulge coefficient, gets 10 ~ 12.
(4) select drift, start sheet-metal press working machine and carry out swollen type preform to sheet metal, treat that sheet metal bulging is to set depth, sheet-metal press working machine stops automatically, obtains the sheet metal after swollen type preform.
(5) take off the sheet metal after swollen type preform, be fixed on the fixture of plate Metal CNC Incremental Forming lathe by the sheet metal after swollen type preform, surrounding compresses;
(6) according to the parameter request of molded part, utilize UG software, first determine that plate Metal CNC Incremental Forming lathe coordinate system is consistent with work coordinate system, the origin of coordinates fixes on the position being conducive to accurate tool setting, draw out the shape in part forming region, generate the NC code that plate Metal CNC Incremental Forming lathe can identify;
(7) the NC code that will generate imports plate Metal CNC Incremental Forming lathe, and operation plate Metal CNC Incremental Forming lathe carries out tool setting by cutter tip point, then processes shaped region needed for sheet metal; When sheet metal is processed into required molded part, stop plate Metal CNC Incremental Forming lathe, take off the product after shaping, complete the shaping of the swollen type of described sheet metal plasticity compound.
What combined by above sheet metal ball-type bulging and plate Metal CNC Incremental Forming is combined into spherical or large forming angle skew wall part method, effectively can improve the efficiency of Sheet metal forming, improve the surface quality of molded part, substantially reduce the time of shaping, improve part thickness and change large defect, especially make the large forming angle part of shaping be achieved.The inventive method has general applicability for sheet forming, except the formed machining for being used for other sheet materials such as steel plate except aluminium sheet processing.
Specific embodiment:
Embodiment 1: select thickness be 1.5mm 08Al as experiment rapidoprint, aluminium sheet is cut on plate shearing machine the shaping plate of 20 pieces of 200 × 200mm, so as experiment in use.20 pieces of plates are divided into 2 groups, adopt the product of the method processing same shape of the combined shaping of plate Metal CNC Incremental Forming method and a kind of sheet metal ball-type bulging provided by the present invention and plate Metal CNC Incremental Forming respectively.
In the process of processing, observe drip molding whether break, and the total time of recording needed for drip molding machine-shaping, shape required total time and the size of shape angles by what compare that two kinds of plastic molding methods are often organized part, illustrate that two kinds of plastic molding methods are on the impact of sheet metal formability.
First plate Metal CNC Incremental Forming method is only adopted to process 10 pieces of plates of first group, first according to the size of drip molding, the sketch for processing parts is drawn out under three-dimensional graphics software UG environment, the NC code that the post-processing function generation plate Metal CNC Incremental Forming lathe recycling UG can identify, NC code is imported in plate Metal CNC Incremental Forming machine operation system, operating numerical control machine tooling molded part, the forming results finally obtained is as shown in table 1:
The forming results of table 1 Metal CNC Incremental Forming method
Just create when 10 maximum forming angles of processing product reach 67 ° in first group of experiment and break, and shaping rupture time is about 12 minutes.Test 1 result to show: the rupture height of pure progressive molding is almost the same, be all at the thinning maximum thinning band place of thickness, occur that rupture time is also close.
Embodiment 2: the combined shaping method adopting a kind of sheet metal ball-type bulging provided by the present invention and plate Metal CNC Incremental Forming to combine is processed second group of 10 pieces of plate.First sheet-metal press working machine is utilized to carry out ball-type bulging (preform) to sheet metal, the degree of depth of ball-type bulging can be calculated according to the model formation in step (2), bulging depth H=2.35cm, then the diameter D=10cm of ball-type bulging is calculated according to the depth gauge of ball-type bulging, carry out plate Metal CNC Incremental Forming to there is preformed sheet metal again, the forming results of 10 drip moldings processed by combined shaping method is as shown in table 2.
The forming results of table 2 combined shaping method
In second group of experiment, 10 molded part are all about 6 minutes process time, and shape angles can reach 75 °, all processes successfully.
Show from the result of above two groups of experiments, adopt combined shaping method provided by the present invention, curring time significantly reduces, and shape angles obtains significant raising, demonstrates ability and the superiority of the combined shaping of ball-type bulging and plate Metal CNC Incremental Forming.
Claims (1)
1. the swollen type manufacturing process of sheet metal plasticity compound, is characterized in that these manufacturing process concrete steps are as follows:
(1), under sheet metal to be formed being fixed on sheet-metal press working machine, operation plate stamping machine makes blank holder rise, and sheet metal surrounding is compressed;
(2) in advance the degree of depth of sheet metal ball-type bulging is calculated according to model, then on sheet-metal press working machine, the degree of depth of sheet metal ball-type bulging is set; The degree of depth of described sheet metal ball-type bulging is according to following model specification:
Wherein: the degree of depth of H-ball-type bulging, unit: cm;
The forming angle of θ-workpiece, angle adopts Circular measure;
λ-proportionality coefficient, gets 10 ~ 12;
(3) in advance the diameter of sheet metal ball-type bulging is calculated according to model, on sheet-metal press working machine, then select the drift of respective diameters; The diameter of described sheet metal ball-type bulging is according to model specification below:
Wherein: the diameter of D-ball-type bulging, unit: cm;
The degree of depth of H-ball-type bulging, unit: cm;
The forming angle of θ-workpiece, angle adopts Circular measure;
K-bulge coefficient, gets 10 ~ 12.
(4) select drift, start sheet-metal press working machine and carry out swollen type preform to sheet metal, treat that sheet metal bulging is to set depth, sheet-metal press working machine stops automatically, obtains the sheet metal after swollen type preform.
(5) take off the sheet metal after swollen type preform, be fixed on the fixture of plate Metal CNC Incremental Forming lathe by the sheet metal after swollen type preform, surrounding compresses;
(6) according to the parameter request of molded part, utilize UG software, first determine that the coordinate system of described plate Metal CNC Incremental Forming lathe is consistent with work coordinate system, the origin of coordinates fixes on the position being conducive to accurate tool setting, draw out the shape in part forming region, generate the NC code that described plate Metal CNC Incremental Forming lathe can identify;
(7) the NC code of generation is imported described plate Metal CNC Incremental Forming lathe, operate described plate Metal CNC Incremental Forming lathe and carry out tool setting by cutter tip point, then shaped region needed for sheet metal is processed; When sheet metal is processed into required molded part, stop described plate Metal CNC Incremental Forming lathe, take off the product after shaping, complete the shaping of the swollen type of sheet metal plasticity compound.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10314855A (en) * | 1997-05-22 | 1998-12-02 | Toyota Motor Corp | Male die forming method of metal sheet |
| JP2002102944A (en) * | 2000-09-25 | 2002-04-09 | Honda Motor Co Ltd | Incremental stretch forming method |
| CN102825130A (en) * | 2012-09-13 | 2012-12-19 | 西北工业大学 | Method for progressively forming frustum-shaped part by using sheets in point-press manner |
| CN103599982A (en) * | 2013-11-25 | 2014-02-26 | 上海交通大学 | Plate material multi-point-die pre-drawing progressive compound forming method and plate material multi-point-die pre-drawing progressive compound forming device |
| CN104259303A (en) * | 2014-08-04 | 2015-01-07 | 安徽工业大学 | Incremental forming method of local heating plate beyond machining point |
| CN104785621A (en) * | 2015-04-16 | 2015-07-22 | 华中科技大学 | Stretch-forming and electromagnetic combining incremental forming method and device of large thin-wall part |
-
2015
- 2015-09-06 CN CN201510560020.9A patent/CN105107909B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10314855A (en) * | 1997-05-22 | 1998-12-02 | Toyota Motor Corp | Male die forming method of metal sheet |
| JP2002102944A (en) * | 2000-09-25 | 2002-04-09 | Honda Motor Co Ltd | Incremental stretch forming method |
| CN102825130A (en) * | 2012-09-13 | 2012-12-19 | 西北工业大学 | Method for progressively forming frustum-shaped part by using sheets in point-press manner |
| CN103599982A (en) * | 2013-11-25 | 2014-02-26 | 上海交通大学 | Plate material multi-point-die pre-drawing progressive compound forming method and plate material multi-point-die pre-drawing progressive compound forming device |
| CN104259303A (en) * | 2014-08-04 | 2015-01-07 | 安徽工业大学 | Incremental forming method of local heating plate beyond machining point |
| CN104785621A (en) * | 2015-04-16 | 2015-07-22 | 华中科技大学 | Stretch-forming and electromagnetic combining incremental forming method and device of large thin-wall part |
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