CN109590370A - A kind of compound liquid-filling shaping method of small Sharp features - Google Patents
A kind of compound liquid-filling shaping method of small Sharp features Download PDFInfo
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- CN109590370A CN109590370A CN201710915003.1A CN201710915003A CN109590370A CN 109590370 A CN109590370 A CN 109590370A CN 201710915003 A CN201710915003 A CN 201710915003A CN 109590370 A CN109590370 A CN 109590370A
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- liquid
- filling
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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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/021—Deforming sheet bodies
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- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The present invention relates to a kind of small compound liquid-filling shaping methods of Sharp features, the following steps are included: Step 1: being classified based on part feature, Step 2: calculating part spread semi finished size, Step 3: designing passive liquid-filling shaping die parameters based on plasticity Volume conservation law, S1, simplify forming part feature, S2, plasticity Volume conservation law, S3, the active and passive filling liquid die parameters of design.The present invention is by carrying out sort research to part feature, obtain the rule of conversion of clearance between matrix and punch, calculate part spread semi finished size, then it is directed to the part of different characteristic, simplify External Shape, based on plasticity Volume conservation law, active and passive liquid-filling shaping die parameters are designed, finally obtain the technological parameter of each passage liquid-filling shaping, effectively increase forming efficiency and precision, to overcome traditional drop forming and mutiprogramming design manufacturing process cumbersome and forming quality limitation, make liquid-filling shaping technology using easy to spread.
Description
Technical field
The invention belongs to part forming technical field more particularly to a kind of compound liquid-filling shaping methods of small Sharp features.
Background technique
In the manufacturing industry such as Aeronautics and Astronautics, automobile, electric appliance, it is frequently encountered the complicated metal plate that some parts there are small Sharp features
Metal parts, the variation of especially complex-shaped, curved surface greatly, drop it is very deep fall pressure part, falling pressure technique is used in sheet metal process
The conventional method for shaping complicated sheet metal part, since noise pollution is big in forming process for the technique, hand finish heavy workload,
Forming quality is not easy to control, and formation of parts surface and internal injury are serious, are not able to satisfy the forming requirements of this kind of part.It is former
It is shaped can be changed by the considerable part Complex Panels of drop forming by rubber pocket hydraulic method, still, there are also suitable one
Part sheet metal component shape and structure is sufficiently complex, drop is very deep.
There is the biggish deep-small hole complexity sheet metal part of small Sharp features, hanging section for some parts, is filled using a time
Liquid drawing can not shape, and at this moment need active and passive compound liquid-filling shaping technology.The deformation distribution of each passage is to part at this time
Forming quality, the economy of forming or even the forming of part success all play conclusive effect, currently, the distribution of deflection
Or based on conventional methods such as handbook, empirical equations, and application is that conventional rigid die drawing is deep, and error is larger, is not suitable for multiple
Miscellaneous part and this new process of hydro-mechanical drawing.Therefore one kind higher deformation distribution method of convenient and practical and precision is needed to determine
The deflection of each passage, make liquid-filling shaping technology using easy to spread, keep fliud flushing forming process more accurate, make part forming
Quality is improved.
Summary of the invention
Type of the present invention aims to overcome that the above-mentioned problems in the prior art, and it is compound to provide a kind of small Sharp features
Liquid-filling shaping method, this method first carry out sort research to part feature, obtain the rule of conversion of clearance between matrix and punch, precision compared with
High deformation distribution method determines the deflection of each passage, make liquid-filling shaping technology using easy to spread, shape fliud flushing
Process is more accurate, is improved part forming quality.
To achieve the above object, the technical solution adopted by the present invention is as follows.
A kind of compound liquid-filling shaping method of small Sharp features, it is characterised in that: the following steps are included:
Step 1: being classified based on part feature:
Hydro-mechanical drawing key process parameter is determined by part feature, and dynamic hydro-mechanical drawing key process parameter was by shaping
Clearance between matrix and punch rule of conversion determines in journey, when being based on part feature sort research, part can be divided into:
A class part: forming process clearance between matrix and punch is constant；
B class part: forming process clearance between matrix and punch is by rule variation；
C class part: the irregular variation of forming process clearance between matrix and punch；
The A class part includes cylindrical member, and the B class part includes Tapered Cup, parabola shaped part, the C class part packet
Include profiled-cross-section part；
The shape and size of spread material are determined according to the feature of above-mentioned three classes part.
Step 2: calculating part spread semi finished size:
The A class part is that the spread material diameter of cylindrical member is D0；
R is radius at A class part neutral line punch-nose angle in formula；H represents A class part neutral line Forming depth；d1,d2,
D3 is respectively part neutral line punch-pin top diameter, diameter, lip diameter at die entrance；
The B class part is the spread material diameter D of Tapered Cup, parabola shaped part0；
L represents B class part neutral line tapered portion length in formula；D1, d2, d3 respectively represent A class part neutral line punch-pin
Diameter and lip diameter at top diameter, die entrance；
The C class part includes the spread semi finished size of profiled-cross-section part:
Step 3: designing passive liquid-filling shaping die parameters based on plasticity Volume conservation law:
S1, simplify forming part feature:
In passive liquid-filling shaping preform punch design, External Shape is carried out to the small Sharp features complex parts in band part
Feature reduction；
The A class External Shape is reduced to standard cylindrical member or box part；
The B class part band tapered shape is reduced to straight wall shape；
The C class part profiled-cross-section shape should be reduced to the corresponding axial symmetry profile of hanging section；
S2, plasticity Volume conservation law:
For part when plate is plastically deformed, the plate plastic deformation includes intra-die deformation and crystal boundary deformation, described
Intra-die deformation includes sliding and twin, these deformations do not lead to the variation of the point integer constant of crystal, so macroscopically
Only volume displaced position, and there is no variations for the plate volume of part；
S3, the active and passive filling liquid die parameters of design:
According to plastic deformation Volume conservation law, the centre part of passive liquid-filling shaping and the whole of active liquid-filling shaping shape
Volume of part is equal, designs passive filling liquid die parameters after determining simplified passive filling liquid punch-pin cross sectional shape, active filling liquid is whole
Shaping dies is then according to part external form shape and size design, first passive filling liquid preform, then active filling liquid forming eventually.
1, by having the biggish deep-small hole complexity sheet metal part of small Sharp features, hanging section for some parts, using master
Dynamic formula liquid-filling shaping easily occurs to rupture unstability and overcome corrugation, and corrugation unstability easily occurs using passive type liquid-filling shaping and overcomes brokenly
Split, combine both the above forming mode can and both strong point, first by passive type liquid-filling shaping carry out preform, then by leading
Dynamic formula liquid-filling shaping carries out whole forming, this active and passive compound achievable small Sharp features complex parts of liquid-filling shaping method
Forming carries out sort research to part feature first, obtains the rule of conversion of clearance between matrix and punch, calculates part spread semi finished size,
Then it is directed to the part of different characteristic, simplifies External Shape, plasticity Volume conservation law is based on, to active and passive liquid-filling shaping mould
Tool parameter be designed, finally obtain the technological parameter of each passage liquid-filling shaping, by active and passive compound liquid-filling shaping method at
Shape has the complicated deep-small hole part of small Sharp features, effectively increases forming efficiency and precision, so that traditional falling be overcome to be pressed into
The limitation of the cumbersome and forming quality of shape and mutiprogramming design manufacturing process, make liquid-filling shaping technology using easy to spread, make
Liquid-filling shaping process is more accurate, is improved part forming quality.
Detailed description of the invention
The small wedge angle deep-recessed part of Fig. 1 aluminum alloy strip.
Centre part after the passive liquid-filling shaping of Fig. 2.
Fig. 3 the method for the invention flow chart.
Specific embodiment
Following further describes the present invention with reference to the drawings.
Embodiment 1
A kind of compound liquid-filling shaping method of small Sharp features, it is characterised in that: the following steps are included:
Step 1: being classified based on part feature:
Hydro-mechanical drawing key process parameter is determined by part feature, and dynamic hydro-mechanical drawing key process parameter was by shaping
Clearance between matrix and punch rule of conversion determines in journey, when being based on part feature sort research, part can be divided into:
A class part: forming process clearance between matrix and punch is constant；
B class part: forming process clearance between matrix and punch is by rule variation；
C class part: the irregular variation of forming process clearance between matrix and punch；
The A class part includes cylindrical member, and the B class part includes Tapered Cup, parabola shaped part, the C class part packet
Include profiled-cross-section part；
The shape and size of spread material are determined according to the feature of above-mentioned three classes part.
Step 2: calculating part spread semi finished size:
The A class part is that the spread material diameter of cylindrical member is D0；
R is radius at A class part neutral line punch-nose angle in formula；H represents A class part neutral line Forming depth；d1,d2,
D3 is respectively part neutral line punch-pin top diameter, diameter, lip diameter at die entrance；
The B class part is the spread material diameter D of Tapered Cup, parabola shaped part0；
L represents B class part neutral line tapered portion length in formula；D1, d2, d3 respectively represent A class part neutral line punch-pin
Diameter and lip diameter at top diameter, die entrance；
The C class part includes the spread semi finished size of profiled-cross-section part:
Step 3: designing passive liquid-filling shaping die parameters based on plasticity Volume conservation law:
As shown in Figure 1, for certain with small Sharp features aluminum alloy part, it is known that part material is LF16-M aluminium alloy,
Material thickness is 1.2mm.Since the part spread semi finished size is larger, drawing coefficient is smaller, and cutting part has small wedge angle, using common filling liquid
Drawing is once-forming to be difficult to realize, and uses drop forming in technique at present, finally also needs to strike by hand and repair school shape, and centre need it is more
Secondary annealing process, complex procedures, die cost is high, and molding surface size is difficult to ensure.Therefore it is considered as passive filling liquid preform and master
Forming shapes the part to dynamic filling liquid twice eventually, can not only reduce forming period in this way, improve forming efficiency, and can effectively improve office
The forming accuracy of the small wedge angle in portion replaces part neutral line diameter using part outer diameter approximation since part wall thickness is smaller.
S1, simplify forming part feature:
In passive liquid-filling shaping preform punch design, External Shape is carried out to the small Sharp features complex parts in band part
Feature reduction；
The A class External Shape is reduced to standard cylindrical member or box part；
The B class part band tapered shape is reduced to straight wall shape；
The C class part profiled-cross-section shape should be reduced to the corresponding axial symmetry profile of hanging section；
For certain with small Sharp features aluminum alloy part, former part is the deep chamber zero of complexity of the part with small wedge angle R1.5
Part, feature side-wall band certain taper, and be parabolic shape at the top of part, suspension area is larger, feature bottom approximation olive shape, comprehensive
Above-mentioned factor is closed, following simplification is done to the part: the small wedge angle in part being changed greatly to R10, side wall is changed to straight wall shape, by part top
Portion is changed to plane and transits to side wall with R10, and feature bottom is changed to cydariform.
S2, plasticity Volume conservation law:
For part when plate is plastically deformed, the plate plastic deformation includes intra-die deformation and crystal boundary deformation, described
Intra-die deformation includes sliding and twin, these deformations do not lead to the variation of the point integer constant of crystal, so macroscopically
Only volume displaced position, and there is no variations for the plate volume of part；
As shown in Fig. 2, simplify after part top curve surface regional implementation charge level product be 25200mm2, simplify after part straight wall with
The sum of curved surface area spread material area is consistent with original part, can meet plastic deformation Volume conservation law, so straight wall portion
Point spread material area should be 16400mm2, and vertical wall section perimeter of section is 795mm, then part straight wall height h is about 21mm.
S3, the active and passive filling liquid die parameters of design:
According to plastic deformation Volume conservation law, the centre part of passive liquid-filling shaping and the whole of active liquid-filling shaping shape
Volume of part is equal, designs passive filling liquid die parameters after determining simplified passive filling liquid punch-pin cross sectional shape, active filling liquid is whole
Shaping dies is then according to part external form shape and size design, first passive filling liquid preform, then active filling liquid forming eventually.
Part top curve surface regional implementation charge level product is 25200mm2 after simplification, part straight wall and curved surface area exhibition after simplifying
The sum of sawing sheet area is consistent with original part, can meet plastic deformation Volume conservation law, so charge level is unfolded in vertical wall section
Product should be 16400mm2, and vertical wall section perimeter of section is 795mm, then part straight wall height h is about 21mm.Passive filling liquid preform
Punch-pin is designed according to Fig. 2, and cavity plate and blank holder are designed according to relevant criterion.Active liquid-filling shaping mold is without convex
Mould, cavity plate shape is according to part external form shape and size design.
By having the biggish deep-small hole complexity sheet metal part of small Sharp features, hanging section for some parts, using actively
Formula liquid-filling shaping easily occurs to rupture unstability and overcome corrugation, and corrugation unstability easily occurs using passive type liquid-filling shaping and overcomes brokenly
Split, combine both the above forming mode can and both strong point, first by passive type liquid-filling shaping carry out preform, then by leading
Dynamic formula liquid-filling shaping carries out whole forming, this active and passive compound achievable small Sharp features complex parts of liquid-filling shaping method
Forming obtains the rule of conversion of clearance between matrix and punch as shown in figure 3, carrying out sort research to part feature first, calculates part
Then spread semi finished size is directed to the part of different characteristic, simplify External Shape, plasticity Volume conservation law is based on, to active and passive
Liquid-filling shaping die parameters are designed, and finally obtain the technological parameter of each passage liquid-filling shaping, pass through active and passive compound filling liquid
Manufacturing process is formed with the complicated deep-small hole part of small Sharp features, effectively increases forming efficiency and precision, to overcome biography
The limitation of the cumbersome and forming quality of the drop forming and mutiprogramming design manufacturing process of system makes the application of liquid-filling shaping technology easily
In popularization, keep liquid-filling shaping process more accurate, is improved part forming quality.
The specific embodiment of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to the application protection scope therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, under the premise of not departing from technical scheme design, various modifications and improvements can be made, these belong to this
The protection scope of application.
Claims (1)
1. a kind of compound liquid-filling shaping method of small Sharp features, it is characterised in that: the following steps are included:
Step 1: being classified based on part feature:
Hydro-mechanical drawing key process parameter is determined by part feature, and dynamic hydro-mechanical drawing key process parameter is by forming process
Clearance between matrix and punch rule of conversion determines, when being based on part feature sort research, part can be divided into:
A class part: forming process clearance between matrix and punch is constant；
B class part: forming process clearance between matrix and punch is by rule variation；
C class part: the irregular variation of forming process clearance between matrix and punch；
The A class part includes cylindrical member, and the B class part includes Tapered Cup, parabola shaped part, and the C class part includes different
Type section part；
The shape and size of spread material are determined according to the feature of above-mentioned three classes part.
Step 2: calculating part spread semi finished size:
The A class part is that the spread material diameter of cylindrical member is D0；
R is radius at A class part neutral line punch-nose angle in formula；H represents A class part neutral line Forming depth；D1, d2, d3 points
It Wei not part neutral line punch-pin top diameter, diameter, lip diameter at die entrance；
The B class part is the spread material diameter D of Tapered Cup, parabola shaped part0；
L represents B class part neutral line tapered portion length in formula；D1, d2, d3 are respectively represented at the top of A class part neutral line punch-pin
Diameter and lip diameter at diameter, die entrance；
The C class part includes the spread semi finished size of profiled-cross-section part:
Step 3: designing passive liquid-filling shaping die parameters based on plasticity Volume conservation law:
S1, simplify forming part feature:
In passive liquid-filling shaping preform punch design, External Shape feature is carried out to the small Sharp features complex parts in band part
Simplify；
The A class External Shape is reduced to standard cylindrical member or box part；
The B class part band tapered shape is reduced to straight wall shape；
The C class part profiled-cross-section shape should be reduced to the corresponding axial symmetry profile of hanging section；
S2, plasticity Volume conservation law:
For part when plate is plastically deformed, the plate plastic deformation includes intra-die deformation and crystal boundary deformation, the crystal grain
Internal modification includes sliding and twin, these deformations do not lead to the variation of the point integer constant of crystal, so being macroscopically
Volume displaced position, and there is no variations for the plate volume of part；
S3, the active and passive filling liquid die parameters of design:
According to plastic deformation Volume conservation law, the centre part of passive liquid-filling shaping and the whole formation of parts of active liquid-filling shaping
Volume is equal, designs passive filling liquid die parameters after determining simplified passive filling liquid punch-pin cross sectional shape, active filling liquid shapes eventually
Mold is then according to part external form shape and size design, first passive filling liquid preform, then active filling liquid forming eventually.
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| CN201710915003.1A CN109590370A (en) | 2017-09-30 | 2017-09-30 | A kind of compound liquid-filling shaping method of small Sharp features |
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| CN201710915003.1A CN109590370A (en) | 2017-09-30 | 2017-09-30 | A kind of compound liquid-filling shaping method of small Sharp features |
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| JP2003311344A (en) * | 2002-04-16 | 2003-11-05 | National Institute Of Advanced Industrial & Technology | Frozen bulge forming method and equipment |
| CN102764808A (en) * | 2012-07-24 | 2012-11-07 | 哈尔滨工业大学 | Hydraulic forming device and method of reducing cylindrical part |
| CN103846331A (en) * | 2014-03-27 | 2014-06-11 | 北京航空航天大学 | Bidirectional pressing liquid-charging forming method for large-size thin-wall complex characteristic panel |
| CN105945120A (en) * | 2016-06-08 | 2016-09-21 | 江西洪都航空工业集团有限责任公司 | Design method for hydrodynamic deep drawing process of axis-symmetric parts |
| CN106799424A (en) * | 2017-04-13 | 2017-06-06 | 安徽江淮汽车集团股份有限公司 | A kind of liquid-filling shaping mould |
-
2017
- 2017-09-30 CN CN201710915003.1A patent/CN109590370A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003311344A (en) * | 2002-04-16 | 2003-11-05 | National Institute Of Advanced Industrial & Technology | Frozen bulge forming method and equipment |
| CN102764808A (en) * | 2012-07-24 | 2012-11-07 | 哈尔滨工业大学 | Hydraulic forming device and method of reducing cylindrical part |
| CN103846331A (en) * | 2014-03-27 | 2014-06-11 | 北京航空航天大学 | Bidirectional pressing liquid-charging forming method for large-size thin-wall complex characteristic panel |
| CN105945120A (en) * | 2016-06-08 | 2016-09-21 | 江西洪都航空工业集团有限责任公司 | Design method for hydrodynamic deep drawing process of axis-symmetric parts |
| CN106799424A (en) * | 2017-04-13 | 2017-06-06 | 安徽江淮汽车集团股份有限公司 | A kind of liquid-filling shaping mould |
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| 同济大学等院校《机械设计制图手册》编写组: "《机械设计制图手册》", 31 August 1991, 同济大学出版社 * |
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Application publication date: 20190409 |