CN102507344B - Metal sheet cupping test method related to strain rate - Google Patents
Metal sheet cupping test method related to strain rate Download PDFInfo
- Publication number
- CN102507344B CN102507344B CN201110311517.9A CN201110311517A CN102507344B CN 102507344 B CN102507344 B CN 102507344B CN 201110311517 A CN201110311517 A CN 201110311517A CN 102507344 B CN102507344 B CN 102507344B
- Authority
- CN
- China
- Prior art keywords
- value
- test
- cupping
- punch
- rate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to a metal sheet cupping test method related to a strain rate. The measured cupping test value is related to the strain rate in the test, a test die is mounted on a servo press, and a strain rate variable cupping test is performed according to that the rate of the servo press is variable on the basis of the sine rule; a pressure sensor and a linear position sensor both installed on the test die accept, compute and process pressure and position signals through a monitoring system, and the cupping test value and a corresponding rate rule curve of a sample can be directly displayed on a displayer; and the value of difference between positions of a male die at a cupping point and the rate of the male die at a corresponding penetrated fracture point are read to be used as the cupping test value together. The invention provides a set of conception and method for testing the cupping performance of the strain rate related metal stamping sheet, the experiments on various materials show that the method of the invention can be used for testing the expansion character index of the metal sheet under the condition of variable rate.
Description
[technical field]
The present invention relates to all metal sheet stamping forming techniques and new material development field, specifically a kind of metal blank bulging method for testing performance associated with deformation velocity in the traffic apparatuss of transport such as automobile, track, aviation, boats and ships, instrument electricity, household electrical appliances.
[background technology]
Under the overall background of global energy-saving and emission-reduction, novel, high strength, lightweight, composite board exploitation emerges in an endless stream.With the continuous lifting of new material usability, its forming technology performance receives publicity all the time.Except improving material, the raising of sheet material forming performance can also be set about from Accurate Measurement and monitoring forming parameters.
The mensuration of forming technology performance needs process conditions relevant in regulation forming process, such as: temperature, lubrication, surface nature, TEXTURE STATE, pressure-pad-force state, deformation velocity etc.Along with the extensive application people of punching production realm information technology go deep into further to the interactional understanding of many factors, in numerous details parameter, the impact of deformation velocity on forming property causes more concern.Y.W.Kwon (2011) have studied the forming property of aluminum alloy and the relation of strain rate, demonstrates the relevance between them, and proposes more precision test is carried out in hope hope by upgrading experimental assembly.Hadianfard (2008) have studied the rule of the strained speed impact of formability of Al-Mg Alloys.The experiment that Pei.Lum.Tso (2010) does on the servo press of variable ram speed shows that limit drawing modulus is relevant with deformation velocity.The temperature processing deep drawing experiment of Serhat (2008) to almag shows that its limited drawing ratio (LDR) also has much relations with ram speed except relevant with temperature.Illustrate that deformation velocity is an important process factor of relation forming technology performance.On the other hand, plate and die surface friction also have forming process to be affected very significantly, H.Y.Gong (2004) research shows that the homogeneity adopting various lubricant method can make to be out of shape improves, thus improve the forming property of plate, and the effect of lubrication is also relevant with deformation velocity to a great extent.
The drawing processing of current most metals plate is all carried out on crank press, and its deformation velocity follows sinusoidal rule substantially.These formability of metal sheets can mensuration all carry out with constant speed in hydraulic system, obtain forming property index and actual conditions have certain difference, reduce the tolerance of forming technology.If can simulate the mensuration that stamping parts forms performance index under the speed law of crank punch press, then can obtain the higher process program of degree of conformity, forming technology performance can obtain larger improvement, and product percent of pass will improve thereupon.
Metal sheet cupping test method is one of method of stamping performance test.Up to now, the AEG-process of national regulations is all carry out under at low speed and constant velocity conditions, and the actual speed situation of producing has difference, and the performance levels of precision that can reflect is limited.
The ultimate principle of AEG-process enters die by a bulb punch compressing circular metal plate, because the outward flange edge-pressing board of metal blank is pushed down, and because the outward flange diameter value of plate is larger, metal material in die plane can not enter in die hole and supplement, metal material below punch is thinning to the form generation of tension with two, finally pulls open.From punch is descending touch plate, pulled open in a flash to blank, the position difference of punch, is AEG-process value.When material thickness, Frotteurism, die entrance, surfaceness, velocity conditions are all consistent, the AEG-process value of this kind of metal blank is larger, and its expansion forming performance is better.The method characterizing this value has a lot.The method that China GB/T4156-2007 and Japanese JISZ2247-1970 specifies is " test specimen starts to produce penetrated crack; namely stop stroke; record the distance declined; be AEG-process value ", international standard ISO-R149 (1960) and DIN DIN50102 (1963), " when test specimen splits printing opacity, record the distance declined, be AEG-process value IE ".These methods are because judge that the opportunity that crackle produces is responsive not or directly perceived, and still can reach certain precision in the occasion of low speed test (<20mm/min), under the deformation velocity that punch press is higher, the error of reflection is larger.
[summary of the invention]
Object of the present invention is exactly solve above-mentioned deficiency, the AEG-process of enterprising row metal plate on the basis of servo press, deformation velocity when cupping trial value and test generation penetrated crack is associated, the concept of corresponding AEG-process value under certain deformation velocity is proposed, create a kind of method measuring the bulging performance of metal blank under various different motion speed and rule condition, in order to instruct the process of accurately predicting plastic forming.Using quartz piezoelectric formula force snesor as Detection Information source, its quick responsive feature can be adapted to crank press operating rate faster, and the sudden change of stamping press curve during so that crackle to occur, as the foundation differentiating AEG-process value.
The present invention adopts following technical scheme: a kind of metal sheet cupping test method associated with deformation velocity, survey AEG-process value with test time deformation velocity relevant, it adopts test mould to be arranged on servo press, utilize the speed of servo press variable on the basis of sinusoidal rule, and meet the feature of most of press machine velocity characteristic, carry out the AEG-process that deformation velocity is variable, the pressure transducer that described test mould is equipped with and linear position sensor are accepted by a supervisory system and computing pressure and position signalling, directly can show the AEG-process value of sample and corresponding speed law curve over the display, the data and curves gathered with pressure transducer and linear position sensor is for foundation, the difference and the correspondence that read the punch position of catastrophe point penetrate the punch speed of breakdown point jointly as AEG-process value, its value IE (v) represents, v is specimen broke moment, and the measured value of punch movement velocity, IE (v) value in different v value situation can differentiate the affecting laws of deformation velocity to this sample.
A kind of metal sheet cupping test mould associated with deformation velocity, this mould comprises bulb punch 09, cope match-plate pattern 23, bulging die socket 08 and the flange fixing installation that forward is installed, described bulb punch 09 is equipped with sensor holder 02, pressure transducer 19 is provided with in described sensor holder 02, can measuring pressure scope switch between 0-10kN and 0-20kN, according to the difference of surveyed metal blank material and thickness, intensity, select suitable test specification, can measuring accuracy be improved; Described sensor holder 02 connects cope match-plate pattern 23, described cope match-plate pattern 23 is arranged on the slide block of servo press, described cope match-plate pattern 23 is equipped with position coordinates chi 05, described die socket 08 is provided with position sensor 06, the stroke of punch press can be recorded, and the real-time deformation speed of each stroke can be calculated thus.The accuracy of detection of linear position sensor is at ± 0.01mm, and described sensor holder 02, position sensor 06 connect supervisory system by operation circuit.
Described flange fixing installation comprises flanging support 03, edge-pressing board 07, flanging insert 13 and die plate insert 11, described flanging support 03 is arranged on cope match-plate pattern 23, described flanging support 03 connects edge-pressing board 07, described edge-pressing board 07 is provided with flanging insert 13, and described die plate insert 11 is arranged on die socket 08.By change die plate insert can convert different die internal diameters and fillet with adapt to bulging requirement of experiment, by changing blank holder insert except can adapting to different Male Die Sizes and requiring, the insert of difference in functionality can also be converted, such as with radiant heating, with the blank holder insert etc. of cooling or heating medium passage, for the control of bulging district temperature.
Gap is left between described sensor holder 02 and the slide block of servo press.
Described pressure transducer adopts quartz piezoelectric formula pressure transducer, and its sample frequency is higher than general resistance strain-gauge transducer, may be used for the pressure test under the higher running speed of sliding block condition of crank press.
Described bulb punch adopts punch fixed spiro 04 connecting sensor seat 02, pressure transducer 19 in described sensor holder 02 is fixed by determining moment of torsion screw 18, and spline pad 17 is housed and spring washer 16 is locking, to ensure constant pretightning force, during 10kN range, measuring accuracy is within ± 0.1kN scope.
Described bulb punch adopts quick replaceable bulb punch, can need the specification of quick-replaceable bulb punch, but Sensor section is wherein general according to difference.
Beneficial effect of the present invention: the present invention is based on a set of the metal stamping plate cupping performance test concept and methodology of deformation velocity association of the crank press design of driven by servomotor, experiment through multiple material shows, can be used in the bulging performance index measuring metal blank under Variable Velocity Condition.Can simulate the mensuration that stamping parts forms performance index under the speed law of crank punch press, can obtain the process program that degree of conformity is higher, forming technology performance can obtain larger improvement, and product percent of pass will improve thereupon.
[accompanying drawing explanation]
Fig. 1 is the variable metal sheet cupping test mould structure schematic diagram of deformation velocity of the present invention;
Fig. 2 is deformation velocity of the present invention when being 10%, and metal sheet cupping test calculates schematic diagram;
Fig. 3 is deformation velocity of the present invention when being 80%, and metal sheet cupping test calculates schematic diagram;
In figure, 01 patrix gib screw, 02 sensor holder, 03 edge-pressing board support, 04 punch fixed spiro, 05 position coordinates chi, 06 position sensor, 07 edge-pressing board, 08 die socket, 09 bulb punch, 10 hydraulic ram, 11 die plate inserts, 12 blanks, 13 blank holder inserts, 14 sensor packing rings, 15 pins, 16 spring washers, 17 spline pads, 18 determine moment of torsion screw, 19 pressure transducers, 20 centring rings, 21 gib screws, 22 sensor extension lines, 23 cope match-plate patterns.
[embodiment]
Below in conjunction with accompanying drawing, following further illustrating is done to the present invention:
The bulging test mould of deformation velocity association of the present invention as shown in Figure 1, the travelling speed of the servo-pressing machine slide block adopted can arrange five sections of constant intervals, carry out setting value with the number percent of maximal rate, change based on sinusoidal curve rule, maximal rate can reach 786mm/s.
Bulb punch 09 punch fixed spiro 04 of the present invention connects cope match-plate pattern 23 by sensor holder 02, and be installed on the slide block of servo press, gap is left between sensor holder 02 and slide block, to ensure that pressure transducer 19 two ends can afford bulb punch and pass the stamping press of coming, determine moment of torsion screw 18 for three, in order to adjust pressure transducer 19, there is correct pretightning force, punching press force value can be reflected exactly, pin 15 keeps the location between sensor holder 02 and cope match-plate pattern 23, and spring washer 16, spline pad 17 are in order to prevent screw loosening.The stamping press that bulb punch 09 produces, by after pressure transducer 19 perception, is sent to supervisory system by sensor extension line 22 and shows in real time.Edge-pressing board support 03, edge-pressing board 07, blank holder insert 13 are fixed together by independently hydraulic mechanism driving, and pressure-pad-force can change between 0.1kN-200kN.The slide block movement speed of servo press is adjustable on sinusoidal basis, thus can control the movement velocity of bulb punch 09, and the deformation velocity of expansion forming changes thereupon.Position coordinates chi 05 is arranged on cope match-plate pattern 23, moves with slider of punch, after the travel position of ram speed and bulb punch all can be detected by position coordinates chi 05, position sensor 06, calculates display by supervisory system record.
During test, first plate blank 12 is placed in die plate insert 11 plane, pushes down the outer ring of blank 12 by blank holder insert 13 with the pressure of setting, then, with the speed law of setting, test specimen is pressed into die with bulb punch 09.The ratio being 27mm and blank external diameter due to die hole footpath in this example is 0.27, even if do not apply its outer shroud of pressure-pad-force also radial shrinkage does not occur, and is subject to two-way action of pulling stress with the test specimen center section blank of punch. contact and realizes bulging being out of shape.If when billet size is less, the trend of blank outer ring radial shrinkage can be retrained by the size controlling pressure-pad-force.
When bulb punch touches blank, load rises suddenly; After bulging occurs, when test specimen occurs penetrating crack, the load that spherical drift acts on there will be downward sudden change (Fig. 2, Fig. 3), the travel position corresponding to load catastrophe point is read from display curve, converse actual compression distance, the Erichsen being national regulations tests the degree of depth, and IE value is counted in letter.IE value is as a material property value of evaluation sheet material expansion forming ability.IE value is larger, and expansion forming performance is better.
The sensitivity of expansion forming performance to deformation velocity of different metals plate is different, and under different deformation velocitys, the IE value of same sample is also variant.The present invention is associated deformation velocity IE value, proposes concept and the assay method of IE (v).Described method can by changing slide block movement speed, under different distortion velocity conditions, bulging test is carried out to metal blank, to obtain the IE value under certain variations velocity conditions, the actual Sheet Metal Forming Technology formulation under making the bulging performance parameter measured more accurately can be used to guide different punch press operation curve rule.
Example 1: adjustment servo press closes height is to 300mm; The ram speed arranging servo press is two sections, and first paragraph is 100% (target location is at distance lower dead center 10mm), and second segment is 10%; Sample is 1.0mm, diameter is the brass sheet of 98.2mm; Experimental situation temperature 20 DEG C, sample upper surface is coated with a little machine oil, repeats to make four samples, record test figure, average, calculate obtain " speed 10%, brass sheet, time m-load-stroke-tensionvelocity curve " as shown in Figure 2; In fig. 2 by initial load catastrophe point A with penetrate load catastrophe point B and respectively make the straight line that is parallel to ordinate, intercept loaded line and obtain C and D point, measure and calculate and obtain C, the difference h=7.14mm of D ordinate, start to penetrate to sample to break for bulb punch touches sample blank, the physical location change of punch; The intersection point E of intercepting and rate curve again, the ordinate value recording E point is v=5mm/s, the real time kinematics velocity amplitude of punch when breaking for penetrating.Record IE (v)=7.14 (5) mm of this sample.
Example 2: adjustment servo press closes height is to 300mm; The ram speed arranging servo press is two sections, and first paragraph is 100% (target location is at distance lower dead center 10mm), and second segment is 80%; Sample is 1.0mm, diameter is the brass sheet of 98.2mm; Experimental situation temperature 20 DEG C, sample upper surface is coated with a little machine oil, repeats to make four samples, record test figure, average, obtain " speed 80%, brass sheet, time m-load-stroke-tensionvelocity curve " as shown in Figure 3; Same measurement also calculates the difference h=6.94mm obtaining C, D ordinate, and the ordinate value recording E point is v=35mm/s.Record IE (v)=6.94 (35) mm of this sample.
Claims (1)
1. the metal sheet cupping test method associated with deformation velocity, it is characterized in that: survey AEG-process value with test time deformation velocity relevant, it adopts test mould to be arranged on servo press, utilize the speed of servo press variable on the basis of sinusoidal rule, and meet the feature of press machine velocity characteristic, carry out the AEG-process that deformation velocity is variable, the pressure transducer that described test mould is equipped with and linear position sensor are accepted by a supervisory system and computing pressure and position signalling, directly show the AEG-process value of sample and corresponding speed law curve over the display, the data and curves gathered with pressure transducer and linear position sensor is for foundation, the difference and the correspondence that read the punch position of catastrophe point penetrate the punch speed of breakdown point jointly as AEG-process value, its value IE (v) represents, v is specimen broke moment, the measured value of punch movement velocity, IE (v) value in different v value situation differentiates that deformation velocity is to the affecting laws of this sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110311517.9A CN102507344B (en) | 2011-10-14 | 2011-10-14 | Metal sheet cupping test method related to strain rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110311517.9A CN102507344B (en) | 2011-10-14 | 2011-10-14 | Metal sheet cupping test method related to strain rate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102507344A CN102507344A (en) | 2012-06-20 |
| CN102507344B true CN102507344B (en) | 2015-07-08 |
Family
ID=46219451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110311517.9A Expired - Fee Related CN102507344B (en) | 2011-10-14 | 2011-10-14 | Metal sheet cupping test method related to strain rate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102507344B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212633A (en) * | 2013-04-11 | 2013-07-24 | 歌尔声学股份有限公司 | Metal tension die |
| CN103230977B (en) * | 2013-05-03 | 2014-03-19 | 创美工艺(常熟)有限公司 | Embedded integrated intelligent die |
| CN103698200B (en) * | 2013-12-20 | 2016-01-13 | 江苏大学 | A kind of plate material performance test experimental |
| CN104165801B (en) * | 2014-08-21 | 2017-02-22 | 江苏大学 | Automatic sheet positioning and failure prediction device |
| CN106053259B (en) * | 2016-05-13 | 2019-03-29 | 北京科技大学 | A kind of thin plate hot forming limit testing device |
| CN106092778B (en) * | 2016-07-08 | 2018-12-14 | 安徽工业大学 | The experimental rig and method of forming limit diagram under the conditions of a kind of acquisition complex loading |
| CN106198179A (en) * | 2016-08-01 | 2016-12-07 | 湖南大学 | A kind of assay device measuring complex diversion systen lower thin sheet forming limit and method |
| CN109425698A (en) * | 2017-08-23 | 2019-03-05 | 宝山钢铁股份有限公司 | The quick pre-judging method of coating presentation quality after a kind of steel formability |
| CN109142048B (en) * | 2018-07-23 | 2021-03-23 | 辽宁工业大学 | Device for in-situ testing and observing plastic deformation capability of metal glass |
| CN111189920A (en) * | 2020-02-14 | 2020-05-22 | 华侨大学 | Ultrasonic vibration assisted metal plate cupping test device and use method thereof |
| CN111331268A (en) * | 2020-03-20 | 2020-06-26 | 本钢板材股份有限公司 | Method for preventing strip breakage of cold-rolled hot-formed steel welding seam rolling mill |
| CN111650060B (en) * | 2020-05-06 | 2021-09-07 | 北京科技大学 | Cupping test machine with adjustable punching press head |
| CN114062157B (en) * | 2020-07-30 | 2023-11-14 | 宝山钢铁股份有限公司 | Aluminum alloy plate bending limit assessment device capable of automatically adjusting gap |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2787326Y (en) * | 2005-05-25 | 2006-06-14 | 重庆工学院 | Sheet material forming die based on pressure transmission of viscoelastic medium |
| CN101290280A (en) * | 2008-06-05 | 2008-10-22 | 北京航空航天大学 | Tepid environment universal sheet shaping test machine |
| DE102008037063A1 (en) * | 2008-08-08 | 2009-04-02 | Daimler Ag | Method for testing coating, particularly lacquer on metallic component, involves forming component by compressing ball stamp, where impedance of barrier layer is measured between coating and component |
| CN201464304U (en) * | 2009-07-22 | 2010-05-12 | 吉林江北机械制造有限责任公司 | Metallic foil strip lightweight cupping tester |
| CN202256074U (en) * | 2011-10-14 | 2012-05-30 | 上海工程技术大学 | Mould for carrying out steel metal cup drawing test on servo press |
-
2011
- 2011-10-14 CN CN201110311517.9A patent/CN102507344B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2787326Y (en) * | 2005-05-25 | 2006-06-14 | 重庆工学院 | Sheet material forming die based on pressure transmission of viscoelastic medium |
| CN101290280A (en) * | 2008-06-05 | 2008-10-22 | 北京航空航天大学 | Tepid environment universal sheet shaping test machine |
| DE102008037063A1 (en) * | 2008-08-08 | 2009-04-02 | Daimler Ag | Method for testing coating, particularly lacquer on metallic component, involves forming component by compressing ball stamp, where impedance of barrier layer is measured between coating and component |
| CN201464304U (en) * | 2009-07-22 | 2010-05-12 | 吉林江北机械制造有限责任公司 | Metallic foil strip lightweight cupping tester |
| CN202256074U (en) * | 2011-10-14 | 2012-05-30 | 上海工程技术大学 | Mould for carrying out steel metal cup drawing test on servo press |
Non-Patent Citations (2)
| Title |
|---|
| 新型杯突试验夹具在万能试验机上的应用;卢长城;《试验技术与试验机》;20060930;35-37 * |
| 胡天雷.400系铁素体不锈钢成形性能的研究.《中国优秀硕士学位论文全文数据库,工程科技I辑》.2011,(第4期), * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102507344A (en) | 2012-06-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102507344B (en) | Metal sheet cupping test method related to strain rate | |
| CN202256074U (en) | Mould for carrying out steel metal cup drawing test on servo press | |
| CN104297287B (en) | Compression heat generation detector and method thereof | |
| CN106334726A (en) | Die abnormality prediction system, press machine provided with the same, and die abnormality prediction method | |
| CN202101900U (en) | DIC-based plate forming property test device | |
| CN103134674B (en) | Device and method used for detection of sliding performance of matching part | |
| CN105372126B (en) | A kind of microstructure observation device suitable for the deformation of metal material stretch bending | |
| CN108414371B (en) | Nondestructive testing method for asphalt pavement crack condition | |
| CN105115464B (en) | Plate-type heat exchanger slab mould gap measuring method | |
| KR20170079822A (en) | Cylinder apparatus with fixing flange in which outer force sensing facility embedded | |
| CN204202518U (en) | A kind of device detecting workpiece size | |
| CN110749303A (en) | Forged part quality detection device | |
| KR20140106394A (en) | Management system for mold clamping device | |
| CN102809471B (en) | Helical compression spring sorting machine | |
| CN105043287A (en) | Cam profile detecting apparatus based on grey correlation evaluation and method thereof | |
| CN206362625U (en) | Portable test system of entrying | |
| CN202149732U (en) | On-line rapid size detection device | |
| CN109975105B (en) | Automatic measurement system for thickness-direction deformation resistance of plate | |
| CN201348605Y (en) | Stamping die for measuring plate shaping friction coefficient | |
| CN217237882U (en) | Steel rail damage identification device based on micro-motion characteristics | |
| CN206832388U (en) | A kind of friction measurement device of rolling piston compressor slide plate and chute | |
| CN115356197A (en) | Online mechanical testing device for cold-rolled steel sheet production line | |
| CN104308060B (en) | A kind of method for supervising of the on-line monitoring system for steel ball cold heading shaping | |
| CN101788432B (en) | Convenient and general multiparameter wedge method for testing metal plate material stretchability | |
| CN207991412U (en) | Aluminum foil coil surface hot drum detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20161014 |