CN110465584A - A kind of progressive molding limit test method of mesh plate - Google Patents
A kind of progressive molding limit test method of mesh plate Download PDFInfo
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- CN110465584A CN110465584A CN201910717040.0A CN201910717040A CN110465584A CN 110465584 A CN110465584 A CN 110465584A CN 201910717040 A CN201910717040 A CN 201910717040A CN 110465584 A CN110465584 A CN 110465584A
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- progressive molding
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- mesh plate
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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
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/005—Incremental shaping or bending, e.g. stepwise moving a shaping tool along the surface of the workpiece
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- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a kind of progressive molding limit test methods of mesh plate, and described method includes following steps: 1) establishing varied angle cone-shaped model, and generate progressive molding numerical control code according to model；2) start progressive molding lathe and input numerical control code；3) it executes progressive molding numerical control code to start to process the varied angle cone-shaped model, records the reading of lathe X, Z axis at this timeWithObtain first breakdown point three dimensional space coordinate；4) by first breakdown point three dimensional space coordinateIt substitutes into varied angle cone-shaped model and acquires forming limit angle；The forming limit angle of mesh plate can be quickly tested out by a model, have the characteristics that easy to operate, testing efficiency is high, test result accuracy is good.
Description
Technical field
The present invention relates to a kind of progressive molding limit test methods of mesh plate, belong to Metal CNC Incremental Forming technical field.
Background technique
Metal blank progressive molding technology is a kind of suitable for single-piece, the quick no mould flexible manufacturing skill of small lot sheet metal component
Art, the technology introduce the thought of the Layered manufacturing of RP technique, and complicated threedimensional model is discrete along short transverse
At several layers, forming tool head carries out plastic processing along contour in two-dimentional level, and plate is successively shaped.The manufacturing process
Expensive Mould design and manufacturing expense is eliminated, metal plate Products Digital is realized and customizes production.
Its special processing method due to progressive molding, as shown in Figure 1, forming tool head is under the action of forming force to original
Beginning plate carries out ironing, and the material of shaped region axially makees shear flow, plate along workpiece under the action of tool heads
Thickness can be thinned, and thinned rule follows cosine law δ=δ0Cos θ (wherein δ0For the original thickness of plate, θ is forming angle, and δ is
The theoretic throat of the position forming angle θ), plate will receive forming limit angle θ in forming processMaxConstraint, as forming angle θ >
θMaxPlate will rupture.
Currently, sentencing determination method mainly for the plate progressive molding limit has following three kinds, the first be king into et al. mention
Arc groove method of testing out, this method test plate in progressive molding by arc groove and right-angled intersection arc groove respectively
Plane strain simple tension strain regime and biaxial tension strain regime draw progressive molding limiting figure (FLD), but due to
Mesh in arc groove processing in mesh plate can occur drastic deformation and even rupture, therefore this method is not suitable for mesh plate
Forming limit test；For second the use varied angle billiard table shape surface model that proposes of G.Hussain et al. measure it is progressive at
The forming limit of plate in shape, as shown in Fig. 2, this method is widely used in non-porous plate progressive molding limiting angle θMaxJudgement；
The third is a kind of macromolecule plate progressive molding limiting angle θ proposed in patent (CN201610244097.X)MaxThe side of test
Method, the criterion that this method fails the corrugation of macromolecule plate as plate, and give test method.Studies have shown that metal mesh
Orifice plate is since mesh can deform during progressive molding and material flows, progressive molding mechanism and the thick regularity of distribution of material
It is very different with common plate, therefore preceding method is not directly applicable the progressive molding limit survey of metal mesh panels
Examination also directly constrains popularization and application of the progressive molding technology in metal mesh panels processing.
From conventional metals plate product bottom occur rupture it is different (initial rupture position generation in the area currently processed
Domain), mesh plate forming when mesh and plate can all deform, the rupture be by between adjacent two hole tensile stress cause it is micro-
Crack propagation is torn, very sensitive to tensile stress, and initial rupture position is frequently experienced in position (initial rupture among product
Position occurs in formed region), the forming of mesh plate is measured according to varied angle billiard table shape surface model as shown in Figure 2
Limiting angle θMax, since traditional varied angle billiard table shape surface model is with the increase of product working depth, shape angles are constantly mentioned
Height, current machining area to formed region generate involve effect can increasingly severe (i.e. tensile stress can be increasing), this
Resulting in the mesh in formed region can rupture in advance, therefore can not pass through traditional varied angle billiard table shape surface model meter
Calculate the forming limit angle θ of mesh plateMax.The progressive molding limit test of metal mesh panels at present is mainly or utilization is multiple not
Conical model with angle is repeatedly approached and is measured, and not only testing efficiency is low, and the forming limit angle measured is by multiple
It approaches, operation randomness is larger, its resultant error is also big.
Summary of the invention
The purpose of the present invention is to provide a kind of progressive molding limit test methods of mesh plate, to solve in the prior art
Caused above-mentioned testing efficiency is low, and the forming limit angle measured is by repeatedly approaching, and operates that randomness is larger, its result
Error also big defect.
A kind of progressive molding limit test method of mesh plate, described method includes following steps:
1) varied angle cone-shaped model is established, and generates progressive molding numerical control code according to model；
2) start progressive molding lathe and input numerical control code；
3) it executes progressive molding numerical control code to start to process the varied angle cone-shaped model, records lathe X at this time, Z axis
Read x0And z0Obtain first breakdown point three dimensional space coordinate P (x0, y0, z0)；
4) by first breakdown point three dimensional space coordinate P (x0, y0, z0) substitute into varied angle cone-shaped model acquire forming limit angle
θMax。
Preferably, further include that clamping needs mesh plate to be tested on progressive molding lathe in the step 2, be mounted to
Shape cutter, mobile progressive molding X, Y, Z axis carries out aim at tool operation, so that initial manufacture coordinate origin is Q (0,0, h).
Preferably, the varied angle cone-shaped model of establishing includes the following steps:
The circle that diameter is d is established in X/Y plane；
Being established respectively in round two sides with Z axis positive direction angle in XZ plane is α and β guide line, and guide line is in Z axis
It is highly h on direction；
Scan along the identical guide line of two height as section for the circle of d using diameter using feature sweep operation
To the varied angle cone-shaped model.
Preferably, the space equation of the varied angle cone-shaped model are as follows:
Wherein, α, β are respectively the minimum angle and maximum angle of varied angle cone-shaped model Yu Z axis positive direction, and
β=β0+ 10 °,
β0For using the imperforate plate progressive molding limit of varied angle billiard table shape surface model measurement；D is varied angle conical die
Type under shed diameter of a circle；(x, y, z) is the space coordinate of arbitrary point on varied angle cone-shaped model.
Preferably, the constraint condition on the space equation boundary are as follows: z ∈ [0, h], h are the height of varied angle cone-shaped model；
The normal vector of any point on its space curved surfaceAre as follows:
Wherein,It is any on its space curved surface
The forming angle θ of point are as follows: For varied angle conical surface model space equation in the direction x
Partial derivative；For varied angle conical surface model space equation the direction y partial derivative；For the sky of varied angle conical surface model
Between equation the direction z partial derivative.
Preferably, the first breakdown point three dimensional space coordinate P (x0, y0, z0) substitute into space curved surface normal vectorThe space and
The calculation formula of forming angle θ finds out forming limit angle θ on curved surfaceMax。
Compared with prior art, advantageous effects of the invention: the invention proposes a kind of mesh plate progressive moldings
The test model and test method of the limit can disposably shape mesh plate in forming angle θ ∈ using varied angle cone-shaped model
The all of [α, β] determine angle cone model, and the forming limit angle of mesh plate can be quickly tested out by a model
θMax, have the characteristics that easy to operate, testing efficiency is high, test result accuracy is good；In addition the present invention is beneficial to progressive molding
Popularization and application of the technology in mesh plate processing.
Detailed description of the invention
Fig. 1 is forming angle schematic diagram in background technique；
Fig. 2 is varied angle billiard table shape surface model schematic diagram in background technique；
Fig. 3 is varied angle cone-shaped model schematic diagram；
Fig. 4 is varied angle cone-shaped model schematic three dimensional views.
Specific embodiment
To be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, below with reference to
Specific embodiment, the present invention is further explained.
According to Fig. 3-Fig. 4, a kind of progressive molding limit test method of mesh plate is disclosed, is included the following steps:
(1) varied angle cone-shaped model is established as shown in figure 3, establishing first in X/Y plane straight in 3D sculpting software
Diameter is the circle of d=20mm, and then being established respectively in round two sides with Z axis positive direction angle in XZ plane again is α=15 ° and β
=75 ° of guide lines, guide line are h=50mm in height in the Z-axis direction, the use of feature sweep operation are then d with diameter
The circle of=20mm is that section is scanned to obtain the varied angle cone-shaped model along the identical guide line of two height, and according to
Progressive molding numerical control code is generated according to model；
The space equation of the varied angle cone-shaped model are as follows: f (x, y, z)=x2+y2-tan15°tan75°z2+(tan15°-
Tan75 °) xz-10 (tan15 °+tan75 °) z-100=0
Wherein, α, β are respectively the minimum angle and maximum angle of varied angle cone-shaped model Yu Z axis positive direction, andβ=β0+ 10 °, β0For using the imperforate plate of varied angle billiard table shape surface model measurement (material and metal mesh panels one
Cause) the progressive molding limit, the non-porous plate forming limit angle beta measured using varied angle billiard table shape surface model is taken here0=65 °
Non-porous Al plate β；D is varied angle cone-shaped model under shed diameter of a circle, takes d=20mm here；Space equation edge-restraint condition
Are as follows: z ∈ [0, h], h are the height of varied angle cone-shaped model, take h=50mm here；(x, y, z) is that varied angle cone-shaped model is taken up an official post
The space coordinate of meaning point.
The normal vector of any point on its space curved surfaceAre as follows:
Wherein,
The forming angle θ of any point on its space curved surface are as follows:
For varied angle conical surface model space equation in the inclined of the direction x
Derivative；For varied angle conical surface model space equation the direction y partial derivative；For the space side of varied angle conical surface model
Partial derivative of the journey in the direction z.
(2) start progressive molding lathe, clamping needs metal mesh opening Al plate to be tested on progressive molding lathe, and installation is straight
Diameter isBulb forming-tool, mobile machine tool X, Y, Z axis carry out aim at tool operation so that initial manufacture coordinate origin be Q
(0,0,50), and the progressive molding numerical control code that step (1) is generated inputs progressive molding machine tool control system；
(3) it executes progressive molding numerical control code to start to process the varied angle cone-shaped model, when metal mesh opening Al plate workpiece
Stop processing immediately when rupturing for the first time, and mobile tool heads record the reading x of lathe X, Z axis at this time at breakdown point0
And z0, and bring the space equation of the varied angle cone-shaped model in step (1) into, as shown in figure 4, obtaining the first breakdown point of mesh plate
Three dimensional space coordinate be P (x0, y0, z0)；
(4) by the first breakdown point P (x of mesh plate in step (3)0, y0, z0) bring into it is any on the space curved surface of step (1)
The normal vector of pointThe forming pole of the metal mesh panels can be found out with the calculation formula of the forming angle θ of any point on space curved surface
Limit angle θMax。
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of progressive molding limit test method of mesh plate, characterized in that described method includes following steps: 1) establishing and become
Angle conical model, and progressive molding numerical control code is generated according to model；
2) start progressive molding lathe and input numerical control code；
3) it executes progressive molding numerical control code to start to process the varied angle cone-shaped model, records the reading x of lathe X, Z axis at this time0
And z0Obtain first breakdown point three dimensional space coordinate P (x0, y0, z0)；
4) by first breakdown point three dimensional space coordinate P (x0, y0, z0) substitute into varied angle cone-shaped model acquire forming limit angle θMax。
2. the progressive molding limit test method of mesh plate according to claim 1, characterized in that in the step 2 also
Including first clamping needs mesh plate to be tested on progressive molding lathe, installs forming tool, mobile progressive molding X, Y, Z axis
Aim at tool operation is carried out, so that initial manufacture coordinate origin is Q (0,0, h).
3. the progressive molding limit test method of mesh plate according to claim 1, characterized in that described to establish varied angle
Cone-shaped model includes the following steps:
The circle that diameter is d is established in X/Y plane；
Being established respectively in round two sides with Z axis positive direction angle in XZ plane is α and β guide line, and guidance is in the Z-axis direction
Line height is h；
This is scanned along the identical guide line of two height as section for the circle of d using diameter using feature sweep operation
Varied angle cone-shaped model.
4. the progressive molding limit test method of mesh plate according to claim 1, characterized in that the varied angle taper
The space equation of model are as follows:
Wherein, α, β are respectively the minimum angle and maximum angle of varied angle cone-shaped model Yu Z axis positive direction, and
β=β0+ 10 °,
β0For using the imperforate plate progressive molding limit of varied angle billiard table shape surface model measurement；D is to open under varied angle cone-shaped model
Mouth diameter of a circle；(x, y, z) is the space coordinate of arbitrary point on varied angle cone-shaped model.
5. the progressive molding limit test method of mesh plate according to claim 4, characterized in that the space equation side
The constraint condition on boundary are as follows: z ∈ [0, h], h are the height of varied angle cone-shaped model；The normal vector of any point on its space curved surface
Are as follows:
Wherein,On its space curved surface any point at
Shape angle θ are as follows: For varied angle conical surface model space equation in the inclined of the direction x
Derivative；For varied angle conical surface model space equation the direction y partial derivative；For the space equation of varied angle conical surface model
Partial derivative in the direction z.
6. the progressive molding limit test method of mesh plate according to claim 5, characterized in that the first breakdown point
Three dimensional space coordinate P (x0, y0, z0) substitute into space curved surface normal vectorIt is found out into the calculation formula of forming angle θ on space curved surface
Shape limiting angle θMax。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112528424A (en) * | 2020-11-03 | 2021-03-19 | 南京工程学院 | Method for improving incremental forming performance of plate |
| US20230035585A1 (en) * | 2021-07-21 | 2023-02-02 | The Boeing Company | Slope-matched stylus tool for incremental sheet forming |
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| CN106825212A (en) * | 2017-02-15 | 2017-06-13 | 青岛理工大学 | A kind of determination methods of multidirectional paddle type mill progressive molding plate rupture |
| CN208437481U (en) * | 2018-03-27 | 2019-01-29 | 山东科技大学 | A kind of laser heating magnesium alloy is without support single-point progressive molding device |
| CN109365631A (en) * | 2018-10-23 | 2019-02-22 | 哈尔滨理工大学 | A kind of electric spark heating metal plate material auxiliary progressive molding device |
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| US6038547A (en) * | 1998-01-07 | 2000-03-14 | Casto; Robin L. | Construction tracking and payment method and system |
| CN105058796A (en) * | 2015-08-07 | 2015-11-18 | 南京工程学院 | High polymer board incremental forming method based on metal backboard supporting |
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| CN106825212A (en) * | 2017-02-15 | 2017-06-13 | 青岛理工大学 | A kind of determination methods of multidirectional paddle type mill progressive molding plate rupture |
| CN208437481U (en) * | 2018-03-27 | 2019-01-29 | 山东科技大学 | A kind of laser heating magnesium alloy is without support single-point progressive molding device |
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| US20230035585A1 (en) * | 2021-07-21 | 2023-02-02 | The Boeing Company | Slope-matched stylus tool for incremental sheet forming |
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