CN109530521A - A method of determining interior high-pressure molding technological parameter - Google Patents
A method of determining interior high-pressure molding technological parameter Download PDFInfo
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- CN109530521A CN109530521A CN201811615193.6A CN201811615193A CN109530521A CN 109530521 A CN109530521 A CN 109530521A CN 201811615193 A CN201811615193 A CN 201811615193A CN 109530521 A CN109530521 A CN 109530521A
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- mold
- fillet
- closing stroke
- unit
- pressure
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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
- B21D26/033—Deforming tubular bodies
- B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature
Abstract
The invention discloses a kind of methods for determining interior high-pressure molding technological parameter.Before it is included in exemplar production, analysis creates interior pressure, mold closes the tolerance band with stroke, obtains the maximum reduction δ of Guan Liang by analysis, fillet is bonded gap α and undercut width d, if exemplar technical requirements: in the case where undercut does not occur, maximum reduction δ is not more than δ0, fillet fitting gap α is no more than α0, undercut width d is no more than 0, and determining distribution of the three above index in interior pressure-mold closing stroke plane, carries out the region of the condition to ask friendship that reasonable mold closing stroke and interior Pressure distribution range can be obtained respectively.
Description
Technical field
The invention belongs to technical field of automobile parts, and in particular to a kind of side for determining interior high-pressure molding technological parameter
Method.
Background technique
Existing plate stamping, welding procedure are not easy the part of shaping form complexity, and availability ratio of the armor plate is low, forming accuracy is low
General assembly error is caused to be difficult to control.Internal high pressure forming replaces solid, variable cross-section to replace cross-section and whole generation with hollow
For piecemeal realize part entirety variable cross-section, internal high pressure forming by with it is hollow replace it is solid, with variable cross-section replace cross-section, with whole
Body forming replaces welding to carry out automobile lightweight.Inner concave shape pipe beam is most commonly seen on automobile, and inner concave shape pipe beam is general
It is realized using preforming+hydroforming, for this molding mode, when punch-pin downlink, if not having inside tubing
Mechanical support, pipe does not flow into mold cavity smoothly at die joint, die joint produce mechanicalness burst it is flat, thus exemplar without
Method is met the requirements.Accordingly, it is determined that mold closing stroke is (referred to herein as the ratio of upper mold Bottom Runby and entire mold closure height
Value, following closing stroke is ratio) seem particularly necessary with internal pressure relationship.Mold closure row can be provided before making exemplar
The relationship of journey and internal pressure can not only greatly shorten the die debugging period, and can be effectively improved sample surface quality and performance.
In clamping process, if not having mechanical support inside tubing, fillet position can not be bonded with punch-nose angle, and at die joint
Pipe cannot smoothly flow into mold cavity due to lacking mechanical support, and pipe is caused at die joint to be directly flattened (such as Fig. 1,2
It is shown), so that exemplar is unable to satisfy requirement.Therefore, using pipe maximum reduction, fillet fitting gap and undercut width as
The evaluation index smoothly completed is molded, Fig. 3 is shown in the specific paraphrase of three kinds of indexs.
By analysis, the relationship cloud atlas between mold closing stroke and interior pressure is established, then special according to product specific structure
Sign, determines mold closing stroke and interior force combination on relationship cloud atlas, the method for this building cloud atlas be not only in height at
Type technological parameter, which is chosen, provides reference frame, and provides foundation for the judgement that interior high-pressure molding analyzes result.
Summary of the invention
The object of the invention is in order to solve deficiency existing for above-mentioned background technique, provide high-pressure molding in a kind of determination
The method of technological parameter.
The technical solution adopted by the present invention is that: a method of determining interior high-pressure molding technological parameter, comprising the following steps:
(1), before exemplar production, analysis creates interior pressure, mold closes the tolerance band with stroke, obtains pipe by analysis
The maximum reduction δ of beam, fillet is bonded gap α and undercut width d, if exemplar technical requirements: there is a situation where undercuts
Under, maximum reduction δ is not more than δ0, fillet fitting gap α is no more than α0, undercut width d be not more than 0, respectively determine three above
Distribution of the index in interior pressure-mold closing stroke plane, fillet are bonded gap α, maximum reduction δ and undercut width d
Meet condition:
δ0、α0It is specified according to design requirement, such as reduction δ0It is required that >=8%, type face tolerance α0≤ ± 1.5mm, to the condition
Region carry out asking friendship that reasonable mold closing stroke and interior Pressure distribution range can be obtained；
(2), by analysis, using interior pressure and mold closing stroke as input variable, between undercut width d, fillet fitting
Gap α and maximum reduction δ designs multiple groups test, obtains the relationship of input with output, and in input plane as output variable
On obtain three target variable isograms, further according to formula (1) determine mold closing stroke and interior pressure distribution tolerance band.
Above-mentioned steps (1) Chinese style (1) can be converted to following formula (2),
Wherein, S0Height, unit: mm are closed for mold；d0The undercut width of pipe, unit: mm after for forming；F is
The coefficient of friction of pipe and mold, generally takes 0.12~0.18；di、liRespectively instantaneous undercut width and instantaneous mold closure row
Journey, unit: mm；P0For the pressure that official jargon inside applies, unit: Mpa；PbFor tubing tensile strength, unit: Mpa；DmaxFor tubing
Maximum section perimeter, unit: mm after forming；D is pipe original outer diameter, unit: mm.
In above scheme, maximum reduction δ is (the initial pipe thickness of pipe thickness-after forming)/initial pipe thickness, single
Position: %；It is the maximum distance between fillet position pipe and mold after shaping, unit: mm that fillet, which is bonded gap α,；Undercut
After width d is forming, the Pipe Base Width of concave die cavity is not flowed into, unit: mm.
The present invention completes the preform of Guan Liang and hydraulic expanding-forming by time applying internal pressure power in clamping process, leads to
The isogram for constructing target variable on the interior pres planes of stroke-is crossed, the combination of pressure and stroke in reasonable is determined, helps
Obtain pipe beam process parameter.
The present invention in the structure feature for fully considering inner concave shape Guan Liang, propose by undercut width, fillet fitting gap and
Evaluation index of the maximum reduction as interior high-pressure molding result determines mold closing stroke and interior pressure by analysis
Relationship cloud atlas determines suitable mold closing stroke and interior force combination according to cloud atlas, and this method is to Belt-type tools tune in reducing
It is extremely advantageous to try the period.
Detailed description of the invention
Fig. 1 is the deformation schematic diagram that mold is closed preceding pipe in the prior art；
The deformation schematic diagram of pipe after Fig. 2 is closed for mold in the prior art；
Fig. 3 is the paraphrase figure of target variable；
Fig. 4 is undercut width distribution cloud atlas；
Fig. 5 is maximum reduction cloud charts；
Fig. 6 is that fillet is bonded gap distribution cloud atlas；
Fig. 7 be present invention determine that mold closing stroke and interior Pressure distribution range schematic diagram.
In figure, 1- cavity plate, 2- punch-pin, 3- pipe fitting, 4- fillet position.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments, convenient for this hair is well understood
It is bright, but they limiting the invention.
A kind of method for determining interior high-pressure molding technological parameter of the present invention, comprising the following steps:
(1), before exemplar production, analysis creates interior pressure, mold closes the tolerance band with stroke, obtains pipe by analysis
The maximum reduction δ of beam, fillet is bonded gap α and undercut width d, if exemplar technical requirements: there is a situation where undercuts
Under, maximum reduction δ is not more than δ0, fillet fitting gap α is no more than α0, undercut width d be not more than 0, respectively determine three above
Distribution of the index in interior pressure-mold closing stroke plane, fillet are bonded gap α, maximum reduction δ and undercut width d
Meet condition:
δ0、α0It is specified according to design requirement, such as reduction δ0It is required that >=8%, type face tolerance α0≤ ± 1.5mm, to the condition
Region carry out asking friendship that reasonable mold closing stroke and interior Pressure distribution range can be obtained；
(2), by analysis, using interior pressure and mold closing stroke as input variable, between undercut width d, fillet fitting
Gap α and maximum reduction δ designs multiple groups test, obtains the relationship of input with output, and in input plane as output variable
On obtain three target variable isograms, further according to formula (1) determine mold closing stroke and interior pressure distribution tolerance band,
As shown in Fig. 4-Fig. 7.
Above-mentioned steps (1) Chinese style (1) can be converted to following formula (2),
Wherein, S0Height, unit: mm are closed for mold；d0The undercut width of pipe, unit: mm after for forming；F is
The coefficient of friction of pipe and mold, generally takes 0.12~0.18；di、liRespectively instantaneous undercut width and instantaneous mold closure row
Journey, unit: mm；P0For the pressure that official jargon inside applies, unit: Mpa；PbFor tubing tensile strength, unit: Mpa；DmaxFor tubing
Maximum section perimeter, unit: mm after forming；D is pipe original outer diameter, unit: mm.
Maximum reduction is to reflect that one of the main indicator of formed product quality generally has performance to want pipe beam
Ask, reduction is excessive, it is too small the performance of pipe beam can all be had an impact, therefore, using maximum reduction as interior high-pressure molding
Performance Evaluating Indexes；What fillet was bonded gap major embodiment is the product laminating degree of pipe beam and design, and interior pressure is too small
Just not can guarantee pipe can fit to die surface, therefore, using fillet fitting gap as Size Evaluation index；Undercut width
In the product appearance of embodiment, if there is undercut, product is necessarily unable to satisfy requirement, and therefore, undercut width is commented as presentation quality
Valence index index.
Determine cloud charts of the evaluation index on mold closing stroke-interior pres planes.It is built first according to product digital-to-analogue
Corresponding mathematical model is found, mold closing stroke and interior pressure are made to design multiple groups analysis model for union variable, according to all
Analysis on mold closing stroke-interior pres planes as a result, construct the isogram of target variable, then according to product structure characteristic
And technical requirements, three target variable threshold values of index are set, and suitable mold closing stroke and internal pressure are determined on cloud atlas
Power combination.
The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (2)
1. a kind of method for determining interior high-pressure molding technological parameter, it is characterised in that: the following steps are included:
(1), before exemplar production, analysis creates interior pressure, mold closes the tolerance band with stroke, obtains Guan Liang's by analysis
Maximum reduction δ, fillet is bonded gap α and undercut width d, if exemplar technical requirements: in the case where undercut does not occur, most
Big reduction δ is not more than δ0, fillet fitting gap α is no more than α0, undercut width d be not more than 0, respectively determine three above index
Distribution in interior pressure-mold closing stroke plane, fillet are bonded gap α, maximum reduction δ and undercut width d and meet
Condition:
δ0、α0It is specified according to design requirement, such as reduction δ0It is required that >=8%, type face tolerance α0≤ ± 1.5mm, to the area of the condition
Domain carries out asking friendship that reasonable mold closing stroke and interior Pressure distribution range can be obtained；
(2), by analysis, interior pressure and mold closing stroke be used as to input variable, undercut width d, fillet be bonded gap α with
And maximum reduction δ designs multiple groups test, obtains the relationship of input with output as output variable, and on input plane
To three target variable isograms, the tolerance band of mold closing stroke and the distribution of interior pressure is determined further according to formula (1).
2. a kind of method for determining interior high-pressure molding technological parameter according to claim 1, it is characterised in that: above-mentioned steps
(1) Chinese style (1) can be converted to following formula (2),
Wherein, S0Height, unit: mm are closed for mold；d0The undercut width of pipe, unit: mm after for forming；F is pipe
With the coefficient of friction of mold, 0.12~0.18 is generally taken；di、liRespectively instantaneous undercut width and instantaneous mold closing stroke, it is single
Position: mm；P0For the pressure that official jargon inside applies, unit: Mpa；PbFor tubing tensile strength, unit: Mpa；DmaxFor forming tubular product
Maximum section perimeter afterwards, unit: mm；D is pipe original outer diameter, unit: mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811615193.6A CN109530521B (en) | 2018-12-27 | 2018-12-27 | Method for determining internal high pressure forming process parameters |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811615193.6A CN109530521B (en) | 2018-12-27 | 2018-12-27 | Method for determining internal high pressure forming process parameters |
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| CN109530521B CN109530521B (en) | 2020-07-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4557128A (en) * | 1982-01-27 | 1985-12-10 | Costabile John J | Apparatus for producing a bulge in thin metal material |
| CN1644264A (en) * | 2005-01-21 | 2005-07-27 | 哈尔滨工业大学 | High-pressure forming method in tubular member for lowering forming pressure |
| CN101967619A (en) * | 2010-11-01 | 2011-02-09 | 成都东丽补强科技有限公司 | Method for reinforcement repair of pipeline by using metal hot spraying and fibrous composite |
| CN104981305A (en) * | 2013-02-12 | 2015-10-14 | 卡特彼勒公司 | Multi-stage tube hydroforming process |
| CN105537364A (en) * | 2016-01-21 | 2016-05-04 | 连云港珍珠河石化管件有限公司 | Preparation method for bi-metal composite t-branch pipe |
-
2018
- 2018-12-27 CN CN201811615193.6A patent/CN109530521B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4557128A (en) * | 1982-01-27 | 1985-12-10 | Costabile John J | Apparatus for producing a bulge in thin metal material |
| CN1644264A (en) * | 2005-01-21 | 2005-07-27 | 哈尔滨工业大学 | High-pressure forming method in tubular member for lowering forming pressure |
| CN101967619A (en) * | 2010-11-01 | 2011-02-09 | 成都东丽补强科技有限公司 | Method for reinforcement repair of pipeline by using metal hot spraying and fibrous composite |
| CN104981305A (en) * | 2013-02-12 | 2015-10-14 | 卡特彼勒公司 | Multi-stage tube hydroforming process |
| CN105537364A (en) * | 2016-01-21 | 2016-05-04 | 连云港珍珠河石化管件有限公司 | Preparation method for bi-metal composite t-branch pipe |
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| CN109530521B (en) | 2020-07-03 |
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