CN102507344A - Metal sheet cupping test method related to strain rate - Google Patents
Metal sheet cupping test method related to strain rate Download PDFInfo
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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 in traffic apparatuss of transport such as automobile, track, aviation, boats and ships, appearance electricity, the household electrical appliances, specifically a kind of metal blank bulging method for testing performance related with deformation velocity.
[background technology]
Under the overall background of global energy-saving and emission-reduction, the exploitation of novel, high strength, lightweight, composite board emerges in an endless stream.Follow 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 mensuration and monitoring forming parameters.
The mensuration of forming technology performance need be stipulated in the forming process relevant process conditions, such as: temperature, lubricated, surface nature, TEXTURE STATE, pressure-pad-force state, deformation velocity or the like.The extensive application people technological along with the punching production realm information further go deep into the interactional understanding of numerous factors, and in numerous details parameters, deformation velocity has caused more concern to the influence of forming property.Y.W.Kwon (2011) has studied the forming property of aluminum alloy and the relation of strain rate, has proved the relevance between them, and proposes to hope through upgrading the hope that experimental assembly carries out more accurate test.Hadianfard (2008) has studied the rule of the strained speed influence of formability of Al-Mg Alloys.The experiment that Pei.Lum.Tso (2010) is done on the servo press of variable ram speed shows that the Limit Drawing height is relevant with deformation velocity.Serhat (2008) to the temperature of almag processing deep drawing experiment show its Limit Drawing than (LDR) except with temperature is relevant and ram speed much relations are also arranged.Explain that deformation velocity is an important process factor that concerns the forming technology performance.On the other hand; Plate and die surface friction also have very remarkable influence to forming process; H.Y.Gong (2004) research shows that the various lubricant methods of employing can be so that the homogeneity of distortion improves; Thereby improve the forming property of plate, and lubricated effect is also relevant with deformation velocity to a great extent.
The drawing of most metal plate processing is at present all carried out on crank press, and its deformation velocity is followed sinusoidal rule basically.The mensuration of these metal blank forming properties is all carried out with constant speed on hydraulic system, the forming property index that obtains and actual conditions certain difference is arranged, reduced the tolerance of forming technology.If can simulate stamping parts forms performance index under the speed law of crank punch press mensuration, then can obtain the higher process program of degree of conformity, the forming technology performance can obtain bigger improvement, and product percent of pass will improve thereupon.
Metal blank AEG-process method is one of method of punching press bulging performance test.Up to now, the AEG-process of GB regulation all is that actual speed situation that carry out and that produce has difference under low speed and constant velocity conditions, and the performance levels of precision that can reflect is limited.
The ultimate principle of AEG-process is to get into die through a bulb punch compressing circular metal plate; Because the outward flange of metal blank is pushed down with the flanging plate; And because the outward flange diameter value of plate is bigger; Metal material on the die plane can not get in the die hole and to replenish, and the metal material below the punch pulls open with two to the form generation attenuation of being drawn at last.Begin from the descending plate that touches of punch, pulled open in a flash to blank, the position difference of punch is the AEG-process value.Under all consistent situation of material thickness, Frotteurism, die entrance, surfaceness, velocity conditions, the AEG-process value of this kind metal blank is big more, and its expansion forming performance is good more.The method that characterizes this value has a lot.The method of China GB/T4156-2007 and Japanese JISZ2247-1970 regulation is " test specimen begins to produce penetrated crack; promptly stop stroke, records the distance that has descended, is the AEG-process value "; International standard ISO-R149 (1960) and DIN DIN50102 (1963); " when test specimen splits printing opacity, record the distance that has descended, be AEG-process value IE ".These methods are because judge that the opportunity that crackle produces is responsive inadequately or directly perceived, and (＜20mm/min) occasion still can reach certain precision, and under the higher deformation velocity of punch press, the error of reflection is bigger in the low speed test.
[summary of the invention]
The object of the invention is exactly to solve above-mentioned deficiency; AEG-process at the basic enterprising row metal plate of servo press; Deformation velocity when taking place penetrated crack to the AEG-process value with test is associated; The notion of proposition corresponding AEG-process value under certain deformation velocity has been created a kind of method of measuring the bulging performance of metal blank under various different motion speed and rule condition, in order to instruct the process of accurately predicting plate Plastic Forming.As detecting information source, its quick responsive characteristics can be adapted to crank press operating rate faster with quartzy piezoelectric force transducer, and the sudden change of stamping press curve during with the generation crackle is as the foundation of differentiating the AEG-process value.
The present invention adopts following technical scheme: a kind of metal blank AEG-process method related with deformation velocity; The AEG-process value of surveying relevant with the deformation velocity in when test; It adopts test mould to be installed on the servo press; Utilize the speed of servo press variable on the basis of sinusoidal rule; And meet the characteristics of most of press machine velocity characteristic; Carry out the variable AEG-process of deformation velocity, pressure transducer that said test mould is equipped with and linear position sensor are accepted and computing pressure and position signalling by a supervisory system, on display, can directly show the AEG-process value and corresponding speed law curve of this sample; Data and curves with pressure transducer and the collection of punch travel position transducer is a foundation, and difference and the corresponding punch speed that penetrates breakdown point of punch position that reads catastrophe point is jointly as the AEG-process value; Its value with IE (represent that v) v is that sample breaks moment, the measured value of punch movement velocity, (v) value can be differentiated the influence rule of deformation velocity to this sample to the IE under the different v value situation.
A kind of metal blank AEG-process mould related 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, and on the said bulb punch 09 sensor holder 02 is housed, and is provided with pressure transducer 19 in the said sensor holder 02; But the measuring pressure scope is switched between 0-10kN and 0-20kN; Different according to survey metal blank material and thickness, intensity are selected suitable test specification, can improve measuring accuracy; Said sensor holder 02 connects cope match-plate pattern 23; Said cope match-plate pattern 23 is installed on the slide block of servo press; On the said cope match-plate pattern 23 position coordinates chi 05 is housed; Said die socket 08 is provided with position sensor 06, can write down the stroke of punch press, and can calculate the real-time deformation speed of each stroke thus.The accuracy of detection of linear position sensor is at ± 0.01mm, and said sensor holder 02, position sensor 06 connect supervisory system by operation circuit.
Said flange fixing installation comprises that flanging support 03, flanging plate 07, flanging insert 13 and die plate insert 11; Said flanging support 03 is installed on the cope match-plate pattern 23; Said flanging support 03 connects flanging plate 07; Said flanging plate 07 is provided with flanging and inserts 13, and said die plate insert 11 is installed on the die socket 08.Through changing can the conversion different die internal diameter of die plate insert and fillet to adapt to same bulging requirement of experiment; Insert except can adapting to different punch dimensional requirements through changing blank holder; Can also the conversion difference in functionality insert; Insert or the like such as having the blank holder radiation heating function, that have cooling or heating medium passage, be used for bulging district temperature controlling.
Leave the gap between the slide block of said sensor holder 02 and servo press.
Said pressure transducer adopts quartzy piezoelectric pressure indicator, and its SF is higher than general resistance strain-gauge transducer, can be used for the pressure test under the higher running speed of sliding block condition of crank press.
Said bulb punch adopts punch fixed spiro 04 to connect sensor holder 02; Pressure transducer 19 in the said sensor holder 02 is fixing through deciding moment of torsion screw 18; And it is locking with spring washer 16 that spline pad 17 is housed; Guaranteeing constant pretightning force, measuring accuracy is within ± 0.1kN scope during the 10kN range.
Said bulb punch adopts quick replaceable bulb punch, can change the specification of bulb punch according to different needs fast, but Sensor section wherein is general.
Beneficial effect of the present invention: a cover of crank press design that the present invention is based on driven by servomotor is deformation velocity related metal stamping plate cupping performance test notion and method; Experiment through multiple material shows, can be used in the bulging performance index of measuring metal blank under the speed change condition.Can simulate stamping parts forms performance index under the speed law of crank punch press mensuration, can obtain the higher process program of degree of conformity, the forming technology performance can obtain bigger improvement, and product percent of pass will improve thereupon.
[description of drawings]
Fig. 1 is the variable metal blank AEG-process mould structure synoptic diagram of deformation velocity of the present invention;
Fig. 2 is that deformation velocity of the present invention is that synoptic diagram is calculated in metal blank AEG-process in 10% o'clock;
Fig. 3 is that deformation velocity of the present invention is that synoptic diagram is calculated in metal blank AEG-process in 80% o'clock;
Among the figure, 01 patrix gib screw, 02 sensor holder, 03 flanging board mount, 04 punch fixed spiro, 05 position coordinates chi, 06 position sensor, 07 flanging plate, 08 die socket, 09 bulb punch, 10 hydraulic ram, 11 die plate inserts, 12 blanks, 13 blank holders are inserted, 14 sensor packing rings, 15 pins, 16 spring washers, 17 spline pads, 18 are decided moment of torsion screw, 19 pressure transducers, 20 centring rings, 21 gib screws, 22 sensor extension lines, 23 cope match-plate patterns.
[embodiment]
Further specify below below in conjunction with accompanying drawing the present invention being done:
The bulging test mould of deformation velocity association according to the invention is as shown in Figure 1; The travelling speed of the servo-pressing machine slide block that is adopted can be provided with five sections constant intervals; Number percent with maximal rate carries out setting value, changes based on the sinusoidal curve rule, and maximal rate can reach 786mm/s.
During test, earlier plate blank 12 is placed on die plate insert 11 planes, inserts with blank holder and 13 push down the outer ring of blank 12, then, with the speed law of setting test specimen is pressed into die with bulb punch 09 with the pressure of setting.Because this routine concave nib is 0.27 for the ratio of 27mm and blank external diameter directly, even do not apply its outer shroud of pressure-pad-force radial shrinkage does not take place yet, and the test specimen center section blank that contacts with drift receives two-way action of pulling stress and realize that bulging is out of shape.If billet size hour, can retrain the trend of blank outer ring radial shrinkage through the size of control pressure-pad-force.
When the bulb punch touched blank, load rose suddenly; After bulging takes place; When test specimen occurs penetrating the crack; Downward sudden change (Fig. 2, Fig. 3) can appear in the load that acts on the spherical drift, from show curve, reads the pairing travel position of load catastrophe point, converses actual compression distance; Be the Erichsen test degree of depth of GB regulation, the IE value is counted in letter.The IE value is as a material behavior value of evaluation sheet material expansion forming ability.The IE value is big more, and the expansion forming performance is good more.
The expansion forming performance of different metals plate is different to the sensitivity of deformation velocity, and the IE value of same sample is also variant under different deformation velocitys.The present invention is associated deformation velocity IE value, has proposed IE (notion v) and assay method.Said method can be through changing slide block movement speed; Metal blank is carried out the bulging test under the different distortion velocity conditions; To obtain the IE value under the certain variations velocity conditions, make the bulging performance parameter of measuring more accurately to be used to instruct the actual Sheet Metal Forming Technology under the different punch press operation curve rules to formulate.
Instance 1: adjust servo press closes height to 300mm; The ram speed that servo press is set is two sections, and first section is 100% (target location apart from lower dead center 10mm), and second section is 10%; Sample is that 1.0mm, diameter are the brass sheet of 98.2mm; 20 ℃ of experimental situation temperature, the sample upper surface is coated with a little machine oil, repeats to do four samples, and the record test figure is averaged, and it is as shown in Figure 2 that calculating obtains " speed 10%, brass sheet, time-load-stroke-tensionvelocity curve "; In Fig. 2 through initial load catastrophe point A with penetrate load catastrophe point B and respectively make a straight line that is parallel to ordinate; The intercepting loaded line obtains C and D point; Measure and calculate acquisition C; The difference h=7.14mm of D ordinate begins to penetrate to sample and breaks for the bulb punch touches the sample blank, and the physical location of punch changes; The intersection point E of intercepting and rate curve again, recording the ordinate value that E orders is v=5mm/s, the real time kinematics velocity amplitude of punch when breaking for penetrating.Write down IE (v)=7.14 (5) mm of this sample.
Instance 2: adjust servo press closes height to 300mm; The ram speed that servo press is set is two sections, and first section is 100% (target location apart from lower dead center 10mm), and second section is 80%; Sample is that 1.0mm, diameter are the brass sheet of 98.2mm; 20 ℃ of experimental situation temperature, the sample upper surface is coated with a little machine oil, repeats to do four samples, and the record test figure is averaged, and it is as shown in Figure 3 to obtain " speed 80%, brass sheet, time-load-stroke-tensionvelocity curve "; Same measure also to calculate obtain C, the difference h=6.94mm of D ordinate, recording the ordinate value that E orders is v=35mm/s.Write down IE (v)=6.94 (35) mm of this sample.
Claims (7)
1. metal blank AEG-process method related with deformation velocity; It is characterized in that: the AEG-process value of surveying relevant with the deformation velocity in when test; It adopts test mould to be installed on the servo press; Utilize the speed of servo press variable on the basis of sinusoidal rule, and meet the characteristics of most of press machine velocity characteristic, carry out the variable AEG-process of deformation velocity; Pressure transducer that said test mould is equipped with and linear position sensor are accepted and computing pressure and position signalling by a supervisory system; AEG-process value that on display, can directly show this sample and corresponding speed law curve are foundation with the data and curves of pressure transducer and the collection of punch travel position transducer, read punch speed that difference and the correspondence of the punch position of catastrophe point penetrate breakdown point jointly as the AEG-process value; Its value is with IE (v) expression; V is that sample breaks moment, the measured value of punch movement velocity, and (v) value can be differentiated the influence rule of deformation velocity to this sample to the IE under the different v value situation.
2. metal blank AEG-process mould related 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; It is characterized in that: sensor holder (02) is housed on the said bulb punch (09), is provided with pressure transducer (19) in the said sensor holder (02), said sensor holder (02) connects cope match-plate pattern (23); Said cope match-plate pattern (23) is installed on the slide block of servo press; Position coordinates chi (05) is housed on the said cope match-plate pattern (23), and said die socket (08) is provided with position sensor (06), and said sensor holder (02), position sensor (06) connect supervisory system by operation circuit.
3. metal blank AEG-process mould according to claim 2; It is characterized in that: said flange fixing installation comprises that flanging support (03), flanging plate (07), flanging insert (13) and die plate insert (11); Said flanging support (03) is installed on the cope match-plate pattern (23); Said flanging support (03) connects flanging plate (07), and said flanging plate (07) is provided with flanging and inserts (13), and said die plate insert (11) is installed on the die socket (08).
4. according to claim 2 or 3 described metal blank AEG-process moulds, it is characterized in that: leave the gap between the slide block of said sensor holder (02) and servo press.
5. metal blank AEG-process mould according to claim 4, it is characterized in that: said pressure transducer adopts quartzy piezoelectric pressure indicator.
6. metal blank AEG-process mould according to claim 5; It is characterized in that: said bulb punch adopts punch fixed spiro (04) to connect sensor holder (02); Pressure transducer (19) in the said sensor holder (02) is fixing through deciding moment of torsion screw (18), and spline pad (17) and spring washer (16) are housed.
7. metal blank AEG-process mould according to claim 6 is characterized in that: said bulb punch adopts quick replaceable bulb punch.
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| CN103212633A (en) * | 2013-04-11 | 2013-07-24 | 歌尔声学股份有限公司 | Metal tension die |
| CN103230977A (en) * | 2013-05-03 | 2013-08-07 | 创美工艺(常熟)有限公司 | Embedded integrated intelligent die |
| CN103698200A (en) * | 2013-12-20 | 2014-04-02 | 江苏大学 | Plate material performance test experimental device |
| CN104165801A (en) * | 2014-08-21 | 2014-11-26 | 江苏大学 | Automatic sheet positioning and failure prediction device |
| CN104198271A (en) * | 2014-08-20 | 2014-12-10 | 江苏大学 | High-temperature sheet forming performance testing mould and method |
| CN106053259A (en) * | 2016-05-13 | 2016-10-26 | 北京科技大学 | Thin plate high temperature forming limit testing device |
| CN106092778A (en) * | 2016-07-08 | 2016-11-09 | 安徽工业大学 | A kind of assay device obtaining forming limit diagram under the conditions of complex loading and method |
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| CN109142048A (en) * | 2018-07-23 | 2019-01-04 | 辽宁工业大学 | A kind of device of in-situ test and observation glassy metal plastic deformation ability |
| 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 |
| 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 |
| CN111650060A (en) * | 2020-05-06 | 2020-09-11 | 北京科技大学 | Cupping test machine with adjustable punching press head |
| CN114062157A (en) * | 2020-07-30 | 2022-02-18 | 宝山钢铁股份有限公司 | Aluminum alloy plate bending limit evaluation device capable of automatically adjusting gap |
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| CN103212633A (en) * | 2013-04-11 | 2013-07-24 | 歌尔声学股份有限公司 | Metal tension die |
| CN103230977A (en) * | 2013-05-03 | 2013-08-07 | 创美工艺(常熟)有限公司 | Embedded integrated intelligent 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 |
| CN103698200A (en) * | 2013-12-20 | 2014-04-02 | 江苏大学 | Plate material performance test experimental device |
| CN104198271A (en) * | 2014-08-20 | 2014-12-10 | 江苏大学 | High-temperature sheet forming performance testing mould and method |
| CN104165801B (en) * | 2014-08-21 | 2017-02-22 | 江苏大学 | Automatic sheet positioning and failure prediction device |
| CN104165801A (en) * | 2014-08-21 | 2014-11-26 | 江苏大学 | Automatic sheet positioning and failure prediction device |
| CN106053259A (en) * | 2016-05-13 | 2016-10-26 | 北京科技大学 | Thin plate high temperature forming limit testing 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 |
| CN106092778A (en) * | 2016-07-08 | 2016-11-09 | 安徽工业大学 | A kind of assay device obtaining forming limit diagram under the conditions of complex loading and method |
| 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 |
| CN109142048A (en) * | 2018-07-23 | 2019-01-04 | 辽宁工业大学 | A kind of device of in-situ test and observation glassy metal plastic deformation ability |
| 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 |
| CN111650060A (en) * | 2020-05-06 | 2020-09-11 | 北京科技大学 | Cupping test machine with adjustable punching press head |
| CN111650060B (en) * | 2020-05-06 | 2021-09-07 | 北京科技大学 | Cupping test machine with adjustable punching press head |
| CN114062157A (en) * | 2020-07-30 | 2022-02-18 | 宝山钢铁股份有限公司 | Aluminum alloy plate bending limit evaluation device capable of automatically adjusting gap |
| 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 |
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