CN1296695C - Analog device method of metal extrusion deformation flow property - Google Patents
Analog device method of metal extrusion deformation flow property Download PDFInfo
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- CN1296695C CN1296695C CNB2004100407334A CN200410040733A CN1296695C CN 1296695 C CN1296695 C CN 1296695C CN B2004100407334 A CNB2004100407334 A CN B2004100407334A CN 200410040733 A CN200410040733 A CN 200410040733A CN 1296695 C CN1296695 C CN 1296695C
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Abstract
The present invention relates to a method for simulating and judging the flowability of extrusion and deformation of metal, which is judged by the following modes that a primary value of a boosting speed or an extruding temperature of an extruding rod can be determined, a sample can be extruded under different extruding temperatures or the boosting speed of the extruding rod, a computer collects data of an extruding routine and the extruding force in the process of extrusion, the collected data is analyzed and compared, and the best extruding temperature or the boosting speed of the extruding rod of the flowability of the extrusion and deformation of the metal can be obtained. Under the best extruding temperature or the boosting speed of the extruding rod, the best boosting speed value or the extruding temperature value of the extruding rod for the flowability of the extrusion and deformation of the metal can be obtained by the same method. The present invention adopts a physical simulation method to simulate the extruding temperature in the extruding process and the boosting speed of the extruding rod and is used for detecting the best parameter of the flowability of the extrusion and deformation of the metal; thereby, the present invention has the advantages of precise detection, simple use and convenient operation.
Description
Technical field
The present invention relates to a kind of pressing method, particularly a kind of simulation decision method of metal crimp flowability.
Background technology
The research of flow of metal technological parameter adopts the high-temperature stream varying stress under mensuration, the more different process combination to finish usually.And high-temperature stream varying stress reaction is the performance of metal under the one-way compressive stress state, is not suitable for the research of crimp.For the crimp of metal, what metal was subjected in recipient is three-dimensional compressive stress, and its distortion is to flow out continuously and continue to the nib of extrusion die with metallic object.When it was in uniform temperature that most important data are studied in extruding production and crimp and necessarily extrusion speed pushes, metal began to flow and continuation keeps mobile needed extruding force, and required extruding force is more little, and this metal extruding flowing property at this moment is good more.
Usually adopt the industry extruding of metal to produce experiment, can obtain data such as extruding force and pressure ram stroke.Can't realize the extruding of isothermal constant speed but experiment is produced in the industry extruding, be difficult to regard to extrusion speed, extrusion temperature the effect of metal extrudability be studied separately, have only employing repeatedly to produce experiment, find out the technology that can be used for producing.Therefore experiment is produced in the industry extruding the expense height, and efficient is low, causes a large amount of wastes, can not satisfy the shortcoming of production needs of the product of the new alloy that increases day by day and new shape section configuration.
For this reason, can substitute the commercial production experiment with the simulated experiment of metal extruding.The simulation judgement of metal extruding utilizes small specimen usually, by pressurizing unit simulation metal being heated and stressing conditions in hot procedure, find out metal extruding force and the mobile rule that influences that is subjected to temperature and deformation velocity, the optimal processing parameter of optimization metal in deformation process.
Technology contents
Purpose of the present invention provides a kind of simulation decision method of metal crimp flowability.It adopts physical simulating method to simulate the fltting speed of extrusion temperature, pressure ram in the extrusion process, is used to measure the optimal parameter of metal crimp flowability, and also has mensuration accurately, uses simply easy to operate advantage.
The present invention includes a pressurizing unit, at first design the multiple array mode of technological parameters such as extrusion temperature and pressure ram fltting speed, implement by repeatedly simulating extruding respectively again.When each simulation is pushed, a sample is placed in the recipient of pressurizing unit, sets the setting value of extrusion temperature and pressure ram fltting speed on computers, begin to simulate squeeze test then,, be used for analyzing by the various desired datas of computer acquisition.The present invention adopts following dual mode to judge:
(1). determine the primary election value of pressure ram fltting speed, under different extrusion temperatures, sample is pushed, computing machine carries out data acquisition to pressure ram stroke, the extruding force of extrusion process, analyzes the data of relatively being gathered, and obtains the mobile best extrusion temperature of metal crimp; Under this best extrusion temperature, adopt the fltting speed of different pressure rams that sample is pushed, computing machine carries out data acquisition to pressure ram stroke, the extruding force of extrusion process, analyzes the data of relatively being gathered, and obtains the pressure ram fltting speed value of the best of metal crimp flowability;
(2). determine the primary election value of extrusion temperature, under different pressure ram fltting speeds, sample is pushed, computing machine carries out data acquisition to pressure ram stroke, the extruding force of extrusion process, analyzes the data of relatively being gathered, and obtains the mobile best pressure ram fltting speed of metal crimp; Under this best pressure ram fltting speed, adopt different extrusion temperatures that sample is pushed, computing machine carries out data acquisition to pressure ram stroke, the extruding force of extrusion process, analyzes the data of relatively being gathered, and obtains the best extrusion temperature value of metal crimp flowability.
The displacement sensor of pressure ram fltting speed by being connected with pressure ram with recipient.Extruding force is by measuring with the pressure transducer that pressure ram is connected with power source.The thermocouple measurement of extrusion temperature by on recipient, being provided with.
The primary election value of pressure ram fltting speed is selected with reference to the existing extrusion process of close alloy product.The primary election value of extrusion temperature is selected a lower temperature value in the lower temperature range of this alloy unit deformation drag.
Advantage of the present invention is:
1. the present invention carries out the simulation judgement of metal squeezing parameter under the isothermal constant speed is pushed, and can solve the isothermal constant speed extruding mensuration that industry extruding pilot production is difficult to finish, and its determination data is accurate, and use is simple, and is easy to operate.
2. under the isothermal isokinetic conditions, respectively at technological parameters such as different metal conversion extrusion temperature, pressure ram fltting speeds, measure the Changing Pattern of the crimp flowability of various metals, to make reliable optimization extrusion process separately at different metal with these parameters.
3. adopt the mode of simulation extruding, its deformation process is to flow out continuously and continuity to the nib of extrusion die with metallic object, can simulate metal and in crimp, be in distortion flow performance under the three-dimensional compressive stress, judge the extruding flowability under the different technical parameters condition, for the optimization of pushing processing parameter provides reference frame.
4. because simulation test adopts small sample to simulate, can make things convenient for, economically the die size and the form parameter of simulation extrusion device be revised.By the mould of employing different size and shape, the contrast extrusion experiment under different extrusion process parameters, the parameter of the size and dimension of optimization mould, the design of pushing production mould for industry provides foundation.
The present invention is described further below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is a process chart of the present invention;
Fig. 2 is the pressurizing unit structure diagram;
Fig. 3 is the relation diagram of crush stroke and extruding force under the different extrusion temperatures;
Fig. 4 is the relation diagram of crush stroke and extruding force under the different pressure ram fltting speeds.
Embodiment
Referring to Fig. 1 and Fig. 2.Earlier sample 3 is placed in the recipient 2, pressure ram 1 applies certain pressure in advance, guarantee the good contact between pressure ram 1, sample 3, the extrusion die 4, make sample be full of recipient, then extrusion die 4, recipient 2 and extruded sample 3 are heated to the extrusion temperature that pre-sets.Pressure ram, recipient and extruding die holder adopt thermal conductivity good and the metal material of higher intensity and hardness arranged.Pressure ram, extrusion die and extruding die holder adopt thermal conductivity materials processing relatively preferably, can guarantee that heat by recipient, pressure ram, extrusion die distributes the temperature rise that the temperature downward trend that causes causes greater than energy conversion in the extrusion process used for forming, specimen temperature raises gradually in the extrusion process to avoid, the temperature constant that keeps extruded sample, on this basis, employing is welded in the temperature of the thermocouple measurement system on the recipient and this temperature information is fed back to computing machine and is used for temperature adjusting.The regulation and control of temperature are to increase or to reduce the mode of size of current by computer control energising heating system, the temperature variation of simulating each moment that is determined by heat dissipation and merit thermal cross in the extrusion process is made adjusting timely, to keep device and the constant temperature of setting of specimen temperature in the extrusion process.
Be placed on the recipient test button, exerting pressure for the pressure ram of pressurizing unit in advance, the extrusion process parameter is being gathered, controlled by computing machine.Pressure ram fltting speed and stroke displacement sensor by being connected with pressure ram with recipient.Extruding force is by measuring with the pressure transducer that pressure ram is connected with power source.The thermocouple measurement of extrusion temperature by on recipient, being provided with.All test figures that record deposit computing machine in after transforming through digital-to-analogue, are used for analyzing and handling.This simulation sample device adopts computing machine and special-purpose control program that process of the test is presetted and process control, can change parameters such as extrusion temperature, pressure ram fltting speed as required, adopt different squeeze modes, as constant speed extruding, isothermal extruding etc., measure the mobile best simulation critical parameter of metal crimp.
Determine a primary election value of pressure ram fltting speed, the speed that advances by the computer installation pressure ram, pressure ram propellings that remain a constant speed impels metal to continue outflow from the nib of pressurizing unit during operation.Computing machine is noted the pressure ram stroke, is kept the pressure ram data such as used extruding force of at the uniform velocity advancing with certain sample frequency.Can obtain this metal thus under this primary election value, some relation curves of different extrusion temperatures and pressure ram fltting speed.And optimize under this primary election value best extrusion temperature and pressure ram fltting speed combination of process parameters.
With known extrusion ratio λ be 36, the trade mark is that AZ31, diameter are that the extruding of the magnesium alloy pole of φ 20 is the simulation decision method of example explanation metal crimp flowability.The pressure ram of present embodiment pressurizing unit, recipient and extruding die holder adopt the H13 steel:
1 seeks the extrusion temperature of extruding good fluidity
The primary election value of pressure ram fltting speed is with reference to the existing process choice of close alloy product.According to the extrusion speed that often uses in the present actual production (be the speed that metallic article flows out nib, V
f, its value is 5 meters/minute), the fltting speed (V of selected pressure ram
j):
V
j=V
fF
f/ F
j=5/36=0.139 (rice/minute)
F wherein
fBe the extruded product basal area, F
jBe recipient inner chamber basal area.Extrusion ratio λ=F
j/ F
f=36.Simulated experiment is adopted identical extrusion ratio with the actual production of φ 20 poles.
Selecting on computers the conduct speed setting with pressure ram for use is 139mm/min, and the extrusion temperature of choosing test is 573K, 625K, 673K and 723K, carries out the extruding of isothermal constant speed respectively.Note the numerical value change of parameters such as extruding force, pressure ram stroke by data acquisition system (DAS) in the extrusion process, make the graph of a relation of pressure ram formation and extruding force along with time duration.Referring to Fig. 3.Horizontal ordinate is the pressure ram stroke, and ordinate is an extruding force.Analyze: in the temperature range that experiment is chosen, along with the rising of temperature, pressure ram advances needed extruding force obviously to descend with 139mm/min speed, and a, b, c curve descend successively in the position of extruding force ordinate direction among Fig. 3; The temperature that a, b, c curve are represented separately is 573K, 625K, 673K, be 50K at interval, but distance is big not as good as the distance between the b, c curve between a, the b curve, and the trend increase that required extruding force reduces be described between 573K to 673K along with the rising of temperature.The relation of pressure ram stroke and extruding force when comparing 673K and 723K, referring to curve c and the d among Fig. 3, two curve close proximity as can be known, illustrate when temperature and be elevated to 673K when above, extruding force seriously weakens with the trend that temperature reduces, only reducing the slightly when extruding force during 723K is compared 673K in each stage of pressure ram stroke.Illustrate when extrusion temperature when 673K is above, the extrusion temperature that further raises again is mobile and to reduce the effect of extruding force not obvious for improving extruding.Carry out the crimp of these goods between 673K to 723K, its extruding flowability is near its optimum condition, and required extruding force also is in reduced levels relatively in the whole pressure ram stroke, so 673K to the 723K desirable extrusion temperature scope that is these goods.Because there is certain mobility scale in temperature control in the commercial production, extrusion temperature can be set at the intermediate value 698K of 673K and 723K, the extrusion temperature of promptly choosing is 423 ℃.
2 seek best at a certain temperature pressure ram fltting speed:
Under 423 ℃, as pressure ram fltting speed V
jDuring=0.139 meter/minute=2.31mm/Sec, the mean strain speed ε=ε during extruding
e/ t
s=ln λ/t
sLn36/43
s=0.08.Get ε=1,0.2,0.1 and 0.01 four point, corresponding pressure ram fltting speed is 29mm/Sec, 5.8mm/Sec, 2.9mm/Sec and 0.29mm/Sec, obtain the relation curve of e shown in Figure 4, f, g and four pressure ram strokes of h and extruding force, referring to Fig. 4, horizontal ordinate is the pressure ram stroke, and ordinate is an extruding force.Analyze the relatively position relation of four curves: when the pressure ram fltting speed is 2.9mm/Sec, see curve g among Fig. 4, in the crush stroke scope, the extruding force maximum does not surpass 4000Kgf, does not surpass 3000Kgf in the time of most of.The pressure ram fltting speed is increased when being twice to 5.8mm/Sec, see curve f among Fig. 4, maximum extrusion pressure has surpassed 4500Kgf, and whole extrusion process extruding force is all on 3000Kgf, and the increase of extruding force is more remarkable; The pressure ram fltting speed increases to 10 times when the 29mm/Sec, sees curve e among Fig. 4, and maximum extrusion pressure has surpassed 6000Kgf, in the time of most of extruding force all on 4000Kgf, the increase highly significant of extruding force; And reduce the pressure ram fltting speed, and dwindle 10 times when the 0.29mm/Sec, see curve h among Fig. 4, extruding force descends not remarkable than curve g in the whole crush stroke.The comparative result explanation, the pressure ram fltting speed changes in 0.29mm/Sec and 2.9mm/Sec scope, the variation of extruding force is smaller, and the pressure ram fltting speed continues to increase on 2.9mm/Sec, then the extruding force increase is more obvious, consider extrusion process metal and alloy flowability, reduce the reduction that capacity of equipment required after the extruding force and energy efficient etc., adopt the pressure ram fltting speed about 2.9mm/Sec, mean strain speed ε=0.1 when promptly pushing is proper.
3. conclusion: to extrusion ratio λ be 36, model is that AZ31, diameter are that the magnesium alloy pole of φ 20 pushes, extrusion temperature and pressure ram fltting speed technological parameter best under above-mentioned primary election value are: extrusion temperature is 423 ℃, and the pressure ram fltting speed is 2.9mm/Sec.
In like manner, determine a primary election value of extrusion temperature, the speed that advances by the computer installation pressure ram, pressure ram propellings that remain a constant speed impels metal to continue outflow from the nib of pressurizing unit during operation.Computing machine is noted the pressure ram stroke, is kept the pressure ram used extruding force data of at the uniform velocity advancing with certain sample frequency.Can obtain this metal thus under this primary election value, some relation curves of different extrusion temperatures and pressure ram fltting speed.And optimize under this primary election value best extrusion temperature and pressure ram fltting speed combination of process parameters.
The primary election value of pressure ram fltting speed is with reference to the existing process choice of close alloy product.The primary election value of extrusion temperature is selected a lower temperature value in the lower temperature range of this alloy unit deformation drag.Determine the primary election value of different pressure ram fltting speed or extrusion temperature, can find out best pressure ram fltting speed and the extrusion temperature of this metal crimp flowability under the primary election value respectively with said method.
Utilize the above-mentioned simulation decision method that utilizes metal crimp flowability,, can find out its different separately optimization extrusion deformation process parameter for the goods of the different section shape of different-alloy.
Claims (6)
1. the simulation decision method of a metal crimp flowability is characterized in that: comprise a pressurizing unit, adopt following dual mode to judge:
(1). determine the primary election value of pressure ram fltting speed, under different extrusion temperatures, sample is pushed: sample is placed in the recipient (1) of pressurizing unit, recipient (1) and extruded sample (3) are heated to the extrusion temperature that pre-sets, computing machine carries out data acquisition to pressure ram stroke, the extruding force of extrusion process, analyze the data of relatively being gathered, obtain the mobile best extrusion temperature of metal crimp; Under this best extrusion temperature, adopt different pressure ram fltting speeds that sample is pushed: sample to be placed in the recipient (1) of pressurizing unit, recipient (1) and extruded sample (3) are heated to the extrusion temperature that pre-sets, computing machine carries out data acquisition to pressure ram stroke, the extruding force of extrusion process, analyze the data of relatively being gathered, obtain the fltting speed value of the pressure ram of the mobile the best of metal crimp;
(2). determine the primary election value of extrusion temperature, under different pressure ram fltting speeds, sample is pushed: sample is placed in the recipient (1) of pressurizing unit, recipient (1) and extruded sample (3) are heated to the extrusion temperature that pre-sets, computing machine carries out data acquisition to pressure ram stroke, the extruding force of extrusion process, analyze the data of relatively being gathered, obtain the mobile best pressure ram fltting speed of metal crimp; Under this best pressure ram fltting speed, adopt different extrusion temperatures that sample is pushed: sample is placed in the recipient (1) of pressurizing unit, recipient (1) and extruded sample (3) are heated to the extrusion temperature that pre-sets, computing machine carries out data acquisition to pressure ram stroke, the extruding force of extrusion process, analyze the data of relatively being gathered, obtain the mobile best extrusion temperature value of metal crimp.
2. the decision method of simulation metal crimp flowability according to claim 1 is characterized in that: the displacement sensor of pressure ram fltting speed by being connected with pressure ram with recipient.
3. the decision method of simulation metal crimp flowability according to claim 1 is characterized in that: extruding force is by measuring with the pressure transducer that pressure ram is connected with power source.
4. the decision method of simulation metal crimp flowability according to claim 1 is characterized in that: the thermocouple measurement of extrusion temperature by being provided with on recipient.
5. the decision method of simulation metal crimp flowability according to claim 1 is characterized in that: the primary election value of pressure ram fltting speed is selected with reference to the existing extrusion process of close alloy product.
6. the decision method of simulation metal crimp flowability according to claim 1 is characterized in that: the primary election value of extrusion temperature is selected a lower temperature value in the lower temperature range of this metallic flat resistance of deformation.
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| CNB2004100407334A CN1296695C (en) | 2004-09-20 | 2004-09-20 | Analog device method of metal extrusion deformation flow property |
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|---|---|---|---|
| CNB2004100407334A CN1296695C (en) | 2004-09-20 | 2004-09-20 | Analog device method of metal extrusion deformation flow property |
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| CN1296695C true CN1296695C (en) | 2007-01-24 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101169357B (en) * | 2007-11-22 | 2010-04-14 | 重庆大学 | Metal hot extrusion formability judging method |
| CN102589979B (en) * | 2012-01-18 | 2013-08-07 | 清华大学 | Simulation experiment method for extrusion welding performance of aluminium alloy |
| CN104316437A (en) * | 2014-10-15 | 2015-01-28 | 华南理工大学 | Plunger type testing apparatus and test method for extrusion rheological property |
| CN104596889B (en) * | 2015-01-27 | 2017-07-18 | 大连交通大学 | A kind of compression method of detection two-phase above metal deformation flow |
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|---|---|---|---|---|
| US5308953A (en) * | 1991-04-04 | 1994-05-03 | Dynisco, Inc. | Heater block holder for a capillary rheometer plunger pressure transducer |
| JPH07260722A (en) * | 1994-03-16 | 1995-10-13 | Sumitomo Metal Mining Co Ltd | Measuring equipment of rheology and electrical characteristic |
| CN2389364Y (en) * | 1999-08-30 | 2000-07-26 | 上海交通大学 | Apparatus for investigating alloy flow properties |
| JP2003262579A (en) * | 2002-03-07 | 2003-09-19 | Asahi Kasei Corp | Viscosity measuring apparatus and method using the same |
| CN2641637Y (en) * | 2003-09-24 | 2004-09-15 | 株洲冶炼集团有限责任公司 | Simple device for testing fluidity and infiltration property of fusant |
-
2004
- 2004-09-20 CN CNB2004100407334A patent/CN1296695C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5308953A (en) * | 1991-04-04 | 1994-05-03 | Dynisco, Inc. | Heater block holder for a capillary rheometer plunger pressure transducer |
| JPH07260722A (en) * | 1994-03-16 | 1995-10-13 | Sumitomo Metal Mining Co Ltd | Measuring equipment of rheology and electrical characteristic |
| CN2389364Y (en) * | 1999-08-30 | 2000-07-26 | 上海交通大学 | Apparatus for investigating alloy flow properties |
| JP2003262579A (en) * | 2002-03-07 | 2003-09-19 | Asahi Kasei Corp | Viscosity measuring apparatus and method using the same |
| CN2641637Y (en) * | 2003-09-24 | 2004-09-15 | 株洲冶炼集团有限责任公司 | Simple device for testing fluidity and infiltration property of fusant |
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