CN203448491U - Superplastic photoelectric measurement free bulging anti-oxidation program control precise loading experimental device - Google Patents
Superplastic photoelectric measurement free bulging anti-oxidation program control precise loading experimental device Download PDFInfo
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- CN203448491U CN203448491U CN201320384777.3U CN201320384777U CN203448491U CN 203448491 U CN203448491 U CN 203448491U CN 201320384777 U CN201320384777 U CN 201320384777U CN 203448491 U CN203448491 U CN 203448491U
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- 238000011068 loading method Methods 0.000 title claims abstract description 55
- 238000005259 measurement Methods 0.000 title claims abstract description 34
- 230000003064 anti-oxidating effect Effects 0.000 title claims abstract description 26
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 116
- 239000007789 gas Substances 0.000 claims abstract description 70
- 238000010438 heat treatment Methods 0.000 claims abstract description 70
- 229910052786 argon Inorganic materials 0.000 claims abstract description 59
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- 238000001816 cooling Methods 0.000 claims abstract description 31
- 230000033228 biological regulation Effects 0.000 claims abstract description 25
- 238000009530 blood pressure measurement Methods 0.000 claims abstract 3
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- 238000002474 experimental method Methods 0.000 description 13
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- 229910045601 alloy Inorganic materials 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000005693 optoelectronics Effects 0.000 description 5
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- 238000009434 installation Methods 0.000 description 2
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- 230000005622 photoelectricity Effects 0.000 description 2
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- 101100015484 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GPA1 gene Proteins 0.000 description 1
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Abstract
本实用新型涉及一种超塑性光电测量自由胀形防氧化程序控制精确加载实验装置。该装置主要由Ⅰ和Ⅱ两路防氧化加热/加载系统、极点高度光电测量系统和冷却系统组成。其中的Ⅰ路为正压加载系统，Ⅱ路为背压加载系统，均由高压净化氩气源、具有压力与温度测控功能的炉外加热及加载气路、以及控制系统组成，两路防氧化加热/加载系统配合作用即可对试样无氧化加热，又能实现恒压、压力跃变和附加背压的对向差压等加载方式。光电测量系统实现对胀形件极点高度的非接触测量。冷却系统对需要冷却的构件实施循环冷水冷却。该装置实现了对胀形件极点高度的非接触测量，能够有效防止试样高温氧化，具有调压精度高、响应快、实验过程安全可靠等特征。
The utility model relates to a superplastic photoelectric measurement free bulging anti-oxidation program control precise loading experimental device. The device is mainly composed of I and II anti-oxidation heating/loading systems, a pole height photoelectric measurement system and a cooling system. Among them, the Ⅰ road is a positive pressure loading system, and the Ⅱ road is a back pressure loading system, both of which are composed of a high-pressure purified argon gas source, an external heating and loading gas circuit with pressure and temperature measurement and control functions, and a control system. The combined action of the heating/loading system can heat the sample without oxidation, and can also realize constant pressure, pressure jump and counter-differential pressure with additional back pressure and other loading methods. The photoelectric measuring system realizes the non-contact measurement of the pole height of the bulging parts. The cooling system implements circulating cold water to cool the components that need to be cooled. The device realizes the non-contact measurement of the pole height of the bulging part, can effectively prevent the high-temperature oxidation of the sample, and has the characteristics of high pressure regulation precision, fast response, and safe and reliable experimental process.
Description
Technical field:
The utility model relates to a kind of superplastic bulging experimental provision, is specially adapted to the accurate loading experimental apparatus of high-temp antioxidizing superplasticity free bulge programme-control, and is the important foundation that Superplastic Bulging With A Die Under Different Pressure Modes is shaped.
Background technology:
Superplastic bulging technology occupies an important position in Aeronautics and Astronautics, automobile and precision instrument field, and has good development prospect.Superplasticity free bulge, border fixes, without frictional influence, and its bulging deformation rule is the basis of Superplastic Bulging With A Die Under Different Pressure Modes.And the experimental provision of free bulge must be able to measure free bulge part limit height in time or the Changing Pattern of pressure, this is the mechanical foundation of formulating different superplasticity sheet material mold filling bulging process schemes.Because superplastic bulging is in two tensile stress states, superplastic deformation has again very strong structure sensitive property, according to the deformation rule of one dimension stretching gained, can not directly be generalized to two-dimentional bulging distortion, even if the composition of known materials and microstructure, also cannot obtain the deformation rule of two-dimentional bulging theoretically.Therefore, must be for composition and the microstructure of concrete superplasticity sheet material, and the load path under both fixed temperature, stress state carries out measuring, try to achieve under certain pressure free bulge part limit height in time with the Changing Pattern of pressure, be just convenient to formulate Superplastic Bulging With A Die Under Different Pressure Modes process program.Because superplastic metal is very little in the super resistance of deformation of moulding at temperature of the best, very strong to the sensitiveness of temperature, the experimental provision of superplasticity free bulge is all that push rod change in displacement by contacting with free bulge part limit obtains in the early stage, and push rod is provided in a side of in the displacement transducer outside high temperature tubular edge mould, because superplastic metal resistance of deformation is at high temperature very little, limit place is again the most serious region of attenuation, this is just because the unable jack-up push rod of bulging part makes experiment test failure, and the push rod contacting with limit causes again the non-uniform temperature of bulging part, this is difficult to again eliminate.After " opto-electrical recording test fixture of protective gas superplastic bulging controllable temperature pressure " (200410010939.2) patent of invention bulletin of the inventor, the basic thought by opto-electronic conversion is measured free bulge limit height in time or pressure changes has been proposed.Although solved some knotty problems of contact measuring method measurement superplasticity free bulge, owing to being manual experiment control, acquired results is quite coarse, can not meet the current requirement to expansive forming.Adopt the adjusting gas flows such as stepper motor or proportional control valve, by setting pressure, automatically control and record corresponding bulging part limit height change, charger and the method for designing program and accurately controlling.In the hope of for different superplasticity sheet material, under different temperatures and different loading paths, from experiment measuring, try to achieve the deformation rule of free bulge, for Superplastic Bulging With A Die Under Different Pressure Modes provides quantitative basis, become the problem that superplasticforming must solve.
Summary of the invention:
Technical problem to be solved in the utility model is: design a kind of at superplasticity temperature, the superplasticity free bulge experimental provision to different plates.Realize two multiple load paths that draw subtend differential pressure bulging of constant voltage, pressure jump and the superimposed back pressure of two tensile stress states, and there is the accurate loading experimental apparatus of superplasticity free bulge programme-control of the features such as preventing high temperature oxidation, opto-electronic conversion are measured, pressure regulation precision is high, response fast, experiment structural safety.
Above-mentioned purpose of the present utility model is achieved in that accompanying drawings is as follows.
The accurate loading experimental apparatus of the anti-oxidation programme-control of superplasticity photoelectric measurement free bulge, described experimental provision is mainly comprised of I and the anti-oxidation heating/loading system of II two-way, limit height photoeletric measuring system and cooling system.Anti-oxidation heating/loading system the ZhongⅠ of two-way road is malleation loading system, II road is back pressure loading system, heating and loading gas circuit and control module composition by pure high pressure argon gas source, pressure and measurement and control of temperature, the mating reaction of two-way heating/loading system can complete sample scale-free heating, can realize again the load modes such as constant voltage, pressure jump and superimposed back pressure subtend differential pressure.Limit height photoeletric measuring system is comprised of light source, photoelectric sensor and treatment circuit thereof, realizes the non-cpntact measurement to bulging part limit height.Cooling system is implemented recirculated water cooling to the cooling part of needs.
In described two-way heating/loading system, I and the anti-oxidation heating/loading system of II two-way independently arrange, its composition and act on identical, its mesohigh argon gas gas cylinder 1, gas cylinder main valve 2, Pressure gauge 3, proportional pressure-reducing valve 4 and pressure sensor 5 form source of the gas part, by control system, control to adjust proportional pressure-reducing valve 4 outputs, pressure sensor 5 detects output pressure, realizes the high pressure relief of argon bottle output gas, argon gas after high pressure relief is through precise pressure regulating valve 6, the first high-precision pressure sensor 9, the first acceleration switching valve 10, check valve 12, through argon inlet pipe 14, enter 23 heating of furnace high-temperature alloy cartridge heater, argon gas after heating passes into respectively epicoele and the cavity of resorption of bulging part in tubular edge mould through HTHP argon gas back pressure air inlet pipe 27 and HTHP argon gas bulging air inlet pipe 26, on bulging part, cavity of resorption is by blast pipe 29, high temperature argon exhaust chamber 31 and the second high-precision pressure sensor 33, rapid escape valve 35 is communicated with atmosphere, formed the heating with pressure and measurement and control of temperature function, load gas circuit, wherein precise pressure regulating valve 6 is driven by stepper motor 7, incremental-rotating coder 8 detects the motor anglec of rotation, on in the first high-precision pressure sensor 9 and the second high-precision pressure sensor 33 difference observing and controlling precise pressure-reducing valve output pressures and tubular edge mould, the pressure of cavity of resorption, furnace high-temperature alloy cartridge heater 23 is placed in Medium Frequency Induction Heating Furnace 22, by intermediate frequency induction heating power supply 20, control heating-up temperature, and then heating argon gas inside, on the first thermocouple detects respectively in high temperature alloy cartridge heater in temperature and tubular edge mould containing secondary meter 21 and the second thermocouple containing secondary meter 36, the temperature of cavity of resorption, the second acceleration switching valve 11 is communicated with two-way gas circuit, rapid escape valve 35 is by solenoid directional control valve and check valve is compound forms, when upper and lower intracavity gas can be discharged, prevent that air from entering, in hydraulic press moved cross beam 44, upper heat-insulating shield 45, annular, blank holder 46, tubular edge mould 47, upper adiabatic cylinder 48, upper annular edge mould 49, lower edge mould 50, lower adiabatic cylinder 51, the lower blank holder 52 of annular, lower heat-insulating shield 53, hydraulic press workbench 54 form bulging adiabatic heat-insulation stove and flange fixing installation.
The control system of described two-way heating/loading is to take singlechip microprocessor as core, realizes the closed loop regulation and control to on-load pressure and heating-up temperature.Described on-load pressure closed loop regulation and control, refer to that single-chip microcomputer passes through pressure sensor 5 and detects bleed pressure, and 4 decompressions of control ratio pressure-reducing valve, realize the regulation and control of high pressure relief closed loop; The first high-precision pressure sensor 9 is set to experimental pressure P, by the second high-precision pressure sensor 33 detect precise pressure-reducing valves output to pressure P in tubular edge mould ', and control step motor direction of rotation and corner regulate Output pressure, form on-load pressure regulation and control closed-loop control, the pressure that pressure sensor is set is increased to 2P-P ', and the pressure in tubular edge mould is just P; Described heating-up temperature closed loop regulation and control, be that single-chip microcomputer passes through the first thermocouple and containing secondary meter 36 and secondary meter, detects temperature in current high temperature alloy cartridge heater and the temperature in tubular edge mould containing secondary meter 21 and the second thermocouple, and regulate and control by regulating the power output of intermediate frequency induction heating power supply to regulate temperature to realize heating-up temperature closed loop; Experimental temperature T by the Temperature Setting of furnace high-temperature alloy cartridge heater 23 at bulging test specimen, the temperature recording in tubular flanging die cavity is T ', then the temperature of furnace high-temperature alloy cartridge heater 23 is changed and is made as 2T-T ', the temperature in tubular edge mould is just T; The opening and closing that single-chip microcomputer passes through to control the first acceleration switching valve 10, the second acceleration switching valve 11 and rapid escape valve 35 are to realize loading or emptying; Between single-chip microcomputer and PC, adopt RS485 to communicate by letter, the data of collection are sent to upper PC, upper PC comes input and output data, instruction etc. mainly as man-machine interface.
Described limit height photoeletric measuring system contains power supply 37 by light source, collector lens 41, photocell 42, optical-electrical converter 43, light source is positioned at a side of tubular edge mould 47 containing power supply 37, collector lens 41, photocell 42, optical-electrical converter 43 is positioned at the opposite side of edge mould, when the directional light that light source sends containing power supply 37 passes through directional light window 38, bulging test specimen 40 shield portions light sources, the part light appearing from directional light window gathers photocell 42 through collector lens 41, photocell 42 is converted to Eco-drive by altitude signal, and be converted to after limit height value by optical-electrical converter 43, by RS485 interface, send to upper PC.
It is cooling that described cooling system is mainly implemented cold water circulation temperature lowering to the cooling member of needs, by pure cold water storage cistern 25, water circulating pump 18 and circulation line form, wherein the cooling water of water circulating pump 18 outputs forms four tunnel circulations after four-way 17, one route pipeline 15 passes into the first recirculated water cold house 13, composition is cooling to the Water-cooling circulating of check valve 12, check valve 12 is the backflows that prevent high temperature argon, two-way passes into Medium Frequency Induction Heating Furnace 22 by pipeline Medium Frequency Induction Heating Furnace recirculated water cooling water inlet pipe 19, form eddy-current heating Water-cooling circulating cooling, last route circulating water water inlet pipe 34.2 and circulating water return pipe 34.1 pass into the second recirculated water cold house I 32.1 and the second recirculated water cold house II 32.2, between 32.1 and 32.2, by Thermostable flexible hose 30, be communicated with, composition is cooling to the Water-cooling circulating of high temperature argon exhaust chamber 31 and the second high-precision pressure sensor 33, finally by pipeline 16, 24 and 34 get back to pure cold water storage cistern 25.
Described device needs the measurement of relevant sensor to demarcate before experiment, demarcates content and mainly comprises: demarcate the relation of setting up between single-chip microcomputer output control voltage and proportional pressure-reducing valve 4 output pressures; The relation between stepper motor 7 anglecs of rotation and precise pressure regulating valve 6 output pressures is set up in demarcation; The control electric current of single-chip microcomputer output and the relation between intermediate frequency induction heating power supply 20 power outputs are set up in demarcation; The relation between photocell 42 output signals and limit height is set up in demarcation;
The described accurate loading method of the anti-oxidation programme-control of a kind of superplasticity photoelectric measurement free bulge, adopts constant voltage P load mode, and described constant voltage loads Zhi Xu mono-tunnel gas circuit I work, comprises the following steps:
(1) close each acceleration switching valve, set required goal pressure, according to current pressure value in gas circuit I and initial alignment pressure value P, relation between resulting stepper motor I 7.1 corners and output pressure, calculate the corresponding corner of goal pressure, and the 7.1 rotation pressure regulation of control step motor I are until the first high-precision pressure sensor I 9.1 output pressures reach initial alignment value.
(2) the first acceleration switching valve I 10.1 of opening gas circuit I while testing loads, make simultaneously rapid escape valve I 35.1 in closed condition, rapid escape valve II 35.2 in opening, control system records bulging on-load pressure value P ' according to the second high-precision pressure sensor I 33.1, make goal pressure bring up to 2P-P ', control step motor rotation pressure regulation makes 33.1 force value reach 2P-P ', now, the force value that the second high-precision pressure sensor I 33.1 records is object of experiment pressure value P.
(3) by opto-electronic conversion measurement mechanism, record bulging part limit height and the relation of time simultaneously.
The described accurate loading method of the anti-oxidation programme-control of a kind of superplasticity photoelectric measurement free bulge, adopts the pressure P before pressure jump
1with the pressure P after pressure jump
2carry out pressure jump load mode, comprise the following steps:
(1) close the second acceleration switching valve 11 and rapid escape valve I 35.1 and rapid escape valve II 35.2,9.1,9.2 pressure value P after setting pressure transition
2, according to current pressure value in gas circuit I and II and nominal pressure value P
2the stepper motor corner of gained and the relation between output pressure, calculate the corresponding corner of pressure after transition, the pressure value P detecting according to the second high-precision pressure sensor I 33.1 and the second high-precision pressure sensor II 33.2 '
2, the force value of the first high-precision pressure sensor I 9.1 and the first high-precision pressure sensor II 9.2 is promoted to 2P
2-P '
2so the force value of gas circuit I and II is all adjusted to the pressure value P after pressure jump
2, and the epicoele of tubular edge mould and the pressure of cavity of resorption reach balance.
(2) close the first acceleration switching valve II 10.2 and 11, open rapid escape valve I 35.1 and rapid escape valve II 35.2, the first high-precision pressure sensor I 9.1 is set in to P
1, close rapid escape valve I 35.1, according to the pressure value P that before pressure jump, the first high-precision pressure sensor I 9.1 is set
1with the pressure value P of the second high-precision pressure sensor I 33.1 actual measurement ', the force value of the first high-precision pressure sensor I 9.1 is promoted to 2P
2-P '
2so the force value of the second high-precision pressure sensor I 33.1 is the pressure value P for setting before transition just
1, meanwhile, bulging part is in pressure P
1effect under free bulge, and by opto-electronic conversion recorder by pressure P
1the lower time dependent recording curve of limit height of effect, when time Δ t, closes the first acceleration switching valve I 10.1, opens the second acceleration switching valve 11, and pressure is just by P
1jump to P
2free bulge records pressure jump value P simultaneously
2the relation curve of limit height and time.
The described accurate loading method of the anti-oxidation programme-control of a kind of superplasticity photoelectric measurement free bulge, adopts superimposed back pressure differential pressure to load free bulge, adopts the subtend differential pressure load mode of superimposed back pressure, comprises the following steps:
(1) close the first acceleration switching valve I 10.1 and rapid escape valve I 35.1 and rapid escape valve II 35.2, open the first acceleration switching valve II 10.2 and the second acceleration switching valve 11, the first high-precision pressure sensor II 9.2 is set as to back pressure P
2, according to the stepper motor corner of current pressure value in II and nominal pressure value gained and the relation between output pressure, calculate corresponding corner, make the pressure controlling of gas circuit I and II to P
2;
(2) close the second acceleration switching valve 11, the pressure of setting the first high-precision pressure sensor I 9.1 is malleation P
1, according to current pressure value in gas circuit I and the stepper motor corner of demarcation gained and the relation between output pressure, calculate corresponding corner, make the pressure of gas circuit I be adjusted to P
1, then open the first acceleration switching valve I 10.1, bulging part is just at superimposed back pressure P
2, malleation P
1differential pressure (P
1-P
2) effect under free bulge, meanwhile, by the relation of bulging limit height and time, transport to photoelectric recording instrument.
The beneficial effects of the utility model:
1. adopt non-contact optoelectronic to measure converted measurement device, the push rod that can eliminate contact causes the harmful effect of additional stress and non-uniform temperature to superplasticity free bulge limit place.
2. adopt stove external heat system heating high pressure argon gas, can significantly shorten the heat time of bulging part, and increased the uniformity of heating test specimen, greatly delayed growing up of superplasticity sheet material crystal grain, make the superplasticity of sheet metal more stable.
3. the secondary meter of adopts pressure sensor and thermocouple, can make pressure testing and controlling and measurement and control of temperature more accurate.Stepper motor drives precise pressure regulating valve, and incremental-rotating coder detects the motor anglec of rotation, pressure sensor detected pressures, and pressure is controlled and can be formed cascade PID control, thereby improves precision and the sensitivity loading, and effectively reduces loading and lags behind.
4. can, under two tensile stress states, carry out the differential pressure free bulge of unidirectional malleation, pressure jump and superimposed back pressure.
5. rapid escape valve I 35.1 and rapid escape valve II 35.2 are set, can and press the air emptying in chamber by pipeline, realize the anti-oxidation effect of pure HTHP argon gas to test specimen, and reduce and reduce the added influence to pressure because of upper cavity space.
6. the PC of take completes operation and the control of whole loading procedure as man-machine interface, and simple to operate, automaticity is high.
Accompanying drawing explanation:
Fig. 1 is superplasticity free bulge experimental provision structure chart;
Fig. 2 is control system structured flowchart;
Fig. 3 is that incremental-rotating coder subdivision is debated to treatment circuit figure
In figure: the pure high pressure argon bottle of 1.1-I, the pure high pressure argon bottle of 1.2-II, 2.1-gas cylinder main valve I, 2.2-gas cylinder main valve II, 3.1-Pressure gauge I, 3.2-Pressure gauge II, 4.1-proportional pressure-reducing valve I, 4.2-proportional pressure-reducing valve II, 5.1-pressure sensor I, 5.2-pressure sensor II, 6.1-precise pressure regulating valve I, 6.2-precise pressure regulating valve II, 7.1-stepper motor I, 7.2-stepper motor II, 8.1-incremental-rotating coder I, 8.2-incremental-rotating coder II, 9.1-the first high-precision pressure sensor I, 9.2-the first high-precision pressure sensor II, 10.1-the first acceleration switching valve I, 10.2-the first acceleration switching valve II, 11-the second acceleration switching valve, 12.1-check valve I, 12.2-check valve II, 13-the first recirculated water cold house, 14.1-argon inlet pipe I, 14.2-argon inlet pipe II, 15-recirculated water cold house water inlet pipe, 16-recirculated water cold house outlet pipe, 17-cross valve, 18-water circulating pump, 19.1-Medium Frequency Induction Heating Furnace recirculated water cooling water inlet pipe I, 19.2-Medium Frequency Induction Heating Furnace recirculated water cooling water inlet pipe II, 20.1-intermediate frequency induction heating power supply I, 20.2-intermediate frequency induction heating power supply II, 21.1-the first thermocouple is containing secondary meter I, 21.2-the first thermocouple is containing secondary meter II, 22.1-Medium Frequency Induction Heating Furnace I, 22.2-Medium Frequency Induction Heating Furnace II, 23.1-furnace high-temperature alloy cartridge heater I, 23.2-furnace high-temperature alloy cartridge heater II, 24.1-intermediate frequency furnace recirculated water cooling return pipe I, 24.2-intermediate frequency furnace recirculated water cooling return pipe II, the pure cold water storage cistern of 25-, 26-HTHP argon gas bulging air inlet pipe, 27-HTHP argon gas back pressure air inlet pipe, 28-is incubated jacket, 29.1-blast pipe I, 29.2-blast pipe II, 30-Thermostable flexible hose, 31.1-high temperature argon exhaust chamber I, 31.2-high temperature argon exhaust chamber II, 32.1-the second recirculated water cold house I, 32.2-the second recirculated water cold house II, 33.1-the second high-precision pressure sensor I, 33.2-the second high-precision pressure sensor II, 34.1-circulating water return pipe, 34.2-circulating water water inlet pipe, 35.1-rapid escape valve I, 35.2-rapid escape valve II, 36.1-the second thermocouple is containing secondary meter I, 36.2-the second thermocouple is containing secondary meter II, 37-light source is containing power supply, 38-directional light window, 39-bulging original paper, 40-bulging test specimen, 41-collector lens, 42-photocell, 43-optical-electrical converter, 44-hydraulic press moved cross beam, the upper heat-insulating shield of 45-, blank holder in 46-annular, 47-tubular edge mould, the upper adiabatic cylinder of 48-, the upper annular edge mould of 49-, edge mould under 50-, adiabatic cylinder under 51-, blank holder under 52-annular, heat-insulating shield under 53-, 54-hydraulic press workbench
The specific embodiment:
Below in conjunction with accompanying drawing embodiment, further illustrate particular content of the present utility model and implementation method thereof.Accompanying drawing 1 is superplasticity free bulge experimental provision structure chart of the present utility model, and accompanying drawing 2 is control system structure chart of the present utility model.
The accurate loading experimental apparatus of the anti-oxidation programme-control of superplasticity photoelectric measurement free bulge, described experimental provision is mainly comprised of I and the anti-oxidation heating/loading system of II two-way, limit height photoeletric measuring system and cooling system.Anti-oxidation heating/loading system the ZhongⅠ of two-way road is malleation loading system, II road is back pressure loading system, by purifying high pressure argon gas source, there is the heating of pressure and measurement and control of temperature function and loading gas circuit and control module composition, the mating reaction of two-way heating/loading system can complete sample scale-free heating, can realize again the load modes such as constant voltage, pressure jump and superimposed back pressure subtend differential pressure.Limit height photoeletric measuring system is comprised of light source, photoelectric sensor and treatment circuit thereof, realizes the non-cpntact measurement to bulging part limit height.Cooling system is implemented cooling to the cooling member of needs.
Wherein the cooling water of water circulating pump 18 outputs passes into the first recirculated water cold house 13 and the second recirculated water cold house 32 and intermediate frequency induction heating power supply (20) and Medium Frequency Induction Heating Furnace 22 through four-way 17, from looping back Returning water case 25 of hot water everywhere, the first 13 pairs of recirculated water cold houses check valve 12 is cooling, and 32 pairs of high temperature argon exhaust chambers 31 of the second recirculated water cold house II and the second high-precision pressure sensor 33 are cooling.Light source is containing power supply 37, collector lens 41, photocell 42, optical-electrical converter 43 forms limit height photoeletric measuring system, light source is positioned at a side of tubular edge mould 47 containing power supply 37, collector lens 41, photocell 42, optical-electrical converter 43 is positioned at the opposite side of edge mould, when the directional light that light source sends containing power supply 37 passes through directional light window 38, bulging test specimen 40 shield portions light sources, the part light appearing from directional light window gathers photocell 42 through collector lens 41, photocell 42 is converted to photoelectricity energy by altitude signal, optical-electrical converter 43 can be converted to photoelectricity after limit height value, by RS485 interface, send to upper PC.
Accompanying drawing 2 is control system structure chart, and PC, as being host computer, completes data processing and the control to single-chip microcomputer of various complexity; Single-chip microcomputer, as slave computer, completes collection and the control to device of data, comprises the regulation and control of source of the gas high pressure relief, on-load pressure regulation and control, temperature adjusting and Loading Control etc., can select C8051F120 High Performance SCM.Pressure sensor 5, the first high-precision pressure sensor 9 and the second high-precision pressure sensor 33 output signals are inputted 12 ADC0 of C8051F120 after amplifying, the ADC0 of C8051F120 single-chip microcomputer comprises the programmable analog MUX (AMUX0) of 9 passages, can programme-control complete acquisition force value after the A/D conversion of three road pressure signals and scale conversion, incremental-rotating coder 8 output two-way phase differences are pulse signal A and the B of 90 °, through segmentation, debate after processing of circuit and further improve resolution ratio, and while turning clockwise, export pulse PA, while being rotated counterclockwise, export pulse PB, consult accompanying drawing 3, can adopt GAL chip GAL22V10 to realize, two pulse signals is inputted respectively Timer/Counter T1 and the T2 of single-chip microcomputer, T1 and T2 count pulse number just can record the corner of stepper motor 7.DAC0 output 0～VREF range of voltages of single-chip microcomputer, as control signal, is carried out 4 decompressions of control ratio pressure-reducing valve, forms the regulation and control of source of the gas part high pressure relief closed loop with pressure sensor 5.The P3.1 of single-chip microcomputer and P3.2 port are exported high/low level, CEX output pulse signal control step motor driver, and then control motor steering and corner realizes on-load pressure to regulate, form the regulation and control of on-load pressure closed loops with the first high-precision pressure sensor 9, the second high-precision pressure sensor 33.The first thermocouple obtains temperature value containing the thermoelectromotive force of secondary meter 36 outputs containing secondary meter 21 and the second thermocouple after secondary meter is processed, and communicate by letter and send to single-chip microcomputer by RS485, single-chip microcomputer is according to the temperature value recording, by DAC1, export 0～VREF range of voltages as control signal, regulate the power output of intermediate frequency induction heating power supply 20, realize the regulation and control of heating-up temperature closed loop.Single-chip microcomputer P3.2, P3.3 and P3.4, as Loading Control port, control the first acceleration switching valve 10, the second acceleration switching valve 11 and rapid escape valve 35 by controlling solid-state relay.Optical-electrical converter sends to PC by RS485 communication after recording limit height.
Described device needs the measurement of relevant sensor to demarcate before experiment, demarcates content and mainly contains: demarcate the relation of setting up between single-chip microcomputer output control electric current and proportional pressure-reducing valve (4) output pressure; The relation between the stepper motor anglec of rotation and precise pressure-reducing valve output pressure is set up in demarcation; The control electric current of single-chip microcomputer output and the relation between induction heating power power output are set up in demarcation; The relation between photocell output signal and limit height is set up in demarcation.
Applying this device, to carry out superplastic bulging when experiment step as follows:
1, lift hydraulic press moved cross beam 44, bulging original paper 39 is packed between upper annular edge mould 49 and lower edge mould 50, hydraulic press moved cross beam 44 moves down, until by setting pressurize pressure-pad-force, test specimen is compressed, and adjust photoelectric measurement experimental provision
2, open the first acceleration switching valve I 10.1, the first acceleration switching valve II 10.2, rapid escape valve I 35.1, rapid escape valve II 35.2, close the second acceleration switching valve 11, make 26HeⅡ road, high pressure argon gas YouⅠ road 27 input respectively the upper and lower chamber of bulging original paper 39, by blast pipe I 29.1,29.2 outputs of blast pipe II, the air in emptying pipeline and upper and lower chamber.
3, the superplasticity temperature of setting bulging original paper 39 by PC is T, and T will be sent to and start induction heating power heating after single-chip microcomputer, until the first thermocouple is containing secondary meter I 21.1, the temperature value that the first thermocouple records containing secondary meter II 21.2 reaches T, now, the second thermocouple is containing secondary meter I 36.1, the second thermocouple is T ' containing the observed temperature of 36.2 pairs of bulging original papers 39 of secondary meter II, T-T '=Δ T, continue to be heated to 21.1, 21.2 measured temperatures reach T+ Δ T=2T-T ', and regulate intermediate frequency induction heating power supply I 20.1, the power output of intermediate frequency induction heating power supply II 20.2, until the temperature stabilization of bulging original paper 39 is T.
4, by PC, select to start experiment after load mode set target pressure, slave computer singlechip microprocessor is controlled and is implemented to load according to the load mode of setting:
(1) the unidirectional free bulge of superplasticity malleation: suppose that the goal pressure that PC is set is P.During experiment, the air pressure of closing 10.2,11,35.1 ，JiangⅡ roads turn-offs, and opens 10.1,35.2.7.1 rotations of control step motor I make 9.1 measuring pressures of precise pressure regulating valve I 6.1 pressure regulation to the first high-precision pressure sensor I reach P, now, the observed pressure of the second high-precision pressure sensor I 33.1 in high temperature argon exhaust chamber I 31.1 is P ', the pressure reduction of high temperature argon exhaust chamber I 31.1 is P-P ', further the rotation of control step motor makes 7.1 pressure regulation of precise pressure regulating valve I, reach 2P-P ' to 9.2 measuring pressures of the first high-precision pressure sensor II, the pressure of corresponding high temperature argon exhaust chamber I 31.1 is just free bulge under the unidirectional bulging pressure P of setting.The pressure sensor contacting with HTHP argon gas is provided in a side of in the second recirculated water cold house I 32.1, to prevent the second high-precision pressure sensor I 33.1 damages.In Bulging Process, the variation of test specimen limit height sends to PC by optical-electrical converter 43 through RS485 communication, as the theoretical foundation of formulating Superplastic Bulging With A Die Under Different Pressure Modes forming technology scheme.During off-test, the first acceleration switching valve I 10.1 need be closed, open rapid escape valve I 35.1, bulging pressure is declined rapidly, otherwise can, because lifting suddenly hydraulic press, produce the blast of gas.
(2) pressure jump superplasticity free bulge: suppose that it is P that PC is set transition front and back pressure
1, P
2.During experiment, close 10.2,11,35.1, open 10.1,35.2.7.1 rotations of control step motor I make 9.1 measuring pressures of precise pressure regulating valve I 6.1 pressure regulation to the first high-precision pressure sensor I reach P
1, now the observed pressure of the second high-precision pressure sensor I 33.1 in high temperature argon exhaust chamber I 31.1 is P
1', the pressure reduction of HTHP argon gas chamber is P
1-P
1', 9.1 measuring pressures of control step motor I 7.1 rotation pressure regulation to the first high-precision pressure sensor I reach 2P
1-P
1', the pressure of corresponding high temperature argon exhaust chamber I 31.1 is the pressure P for setting just
1, by setting-up time in pressure P
1effect under bulging.Then close 10.1,10.2, open 11, by gas circuit II, load transition to setting pressure P
2effect under bulging.In Bulging Process, the height value that PC sends by accepting optical-electrical converter 43, records bulging test specimen limit height with P
1and P
2variation, as the foundation of measuring superplasticity free bulge sensitivity of strain rate exponent m value.After bulging finishes, the high pressure argon gas in bulging test specimen cavity of resorption need be down to atmospheric pressure, can lift hydraulic press.
(3) the differential pressure bulging of superimposed back pressure: suppose that it is P that PC is set malleation
1, superimposed back pressure P
2, differential pressure is P
1-P
2.During experiment, close 10.1,35.1,35.2.7.2 rotations of control step motor II make 9.2 measuring pressures of precise pressure regulating valve II 6.2 pressure regulation to the first high-precision pressure sensor II reach P
2, now the observed pressure of the second high-precision pressure sensor II 33.2 in high temperature argon exhaust chamber II 31.2 is P '
2, the pressure reduction of HTHP argon gas chamber is P
2-P '
2, 9.2 measuring pressures of control step motor II 7.2 rotation pressure regulation to the first high-precision pressure sensor II reach 2P
2-P '
2, the pressure of high temperature argon exhaust chamber I 31.1 and high temperature argon exhaust chamber II 31.2 is just the pressure P of setting
2; Close 11, open 10.1,7.1 rotations of control step motor I make 9.1 measuring pressures of precise pressure regulating valve I 6.1 pressure regulation to the first high-precision pressure sensor I reach P
1, now the observed pressure of the second high-precision pressure sensor I 33.1 in high temperature argon exhaust chamber I 31.1 is P
1', the pressure reduction of HTHP argon gas chamber is P
1-P
1', 9.1 measuring pressures of control step motor I 7.1 rotation pressure regulation to the first high-precision pressure sensor I reach 2P
1-P
1', the pressure of corresponding high temperature argon exhaust chamber I 31.1 is the pressure P for setting just
1, last, bulging test specimen is just at malleation P
1with superimposed back pressure P
2acting in conjunction under bulging, at P
1-P
2differential pressure effect under free bulge.In Bulging Process, PC records bulging test specimen limit height change by accepting the height value of optical-electrical converter 43 transmissions.
Claims (5)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286186A (en) * | 2012-12-27 | 2013-09-11 | 吉林大学 | Anti-oxidation program controlled accurate loading experiment device and method for super-plasticity free bulging through photoelectric measurement |
| CN104749035A (en) * | 2015-03-18 | 2015-07-01 | 西北大学 | Loading device and method for soil triaxial apparatus |
| CN105415745A (en) * | 2014-09-03 | 2016-03-23 | 天津市天锻压力机有限公司 | Pressure control system for large superplastic forming and diffusion bonding hydraulic machine |
| CN107052127A (en) * | 2017-06-12 | 2017-08-18 | 姚圣杰 | A kind of high temperature gas expansion forming line production system and method |
| CN110328279A (en) * | 2019-05-28 | 2019-10-15 | 北京航星机器制造有限公司 | A kind of mechanical pressure loading method being applicable in SPF Technology |
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2013
- 2013-06-28 CN CN201320384777.3U patent/CN203448491U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286186A (en) * | 2012-12-27 | 2013-09-11 | 吉林大学 | Anti-oxidation program controlled accurate loading experiment device and method for super-plasticity free bulging through photoelectric measurement |
| CN103286186B (en) * | 2012-12-27 | 2015-05-13 | 吉林大学 | Anti-oxidation program controlled accurate loading experiment device and method for super-plasticity free bulging through photoelectric measurement |
| CN105415745A (en) * | 2014-09-03 | 2016-03-23 | 天津市天锻压力机有限公司 | Pressure control system for large superplastic forming and diffusion bonding hydraulic machine |
| CN105415745B (en) * | 2014-09-03 | 2017-05-24 | 天津市天锻压力机有限公司 | Pressure control system for large superplastic forming and diffusion bonding hydraulic machine |
| CN104749035A (en) * | 2015-03-18 | 2015-07-01 | 西北大学 | Loading device and method for soil triaxial apparatus |
| CN104749035B (en) * | 2015-03-18 | 2017-03-29 | 西北大学 | A kind of earthwork triaxial apparatus charger and loading method |
| CN107052127A (en) * | 2017-06-12 | 2017-08-18 | 姚圣杰 | A kind of high temperature gas expansion forming line production system and method |
| CN107052127B (en) * | 2017-06-12 | 2019-03-01 | 东营布鲁特新材料有限公司 | A kind of high temperature gas expansion forming line production system and method |
| CN110328279A (en) * | 2019-05-28 | 2019-10-15 | 北京航星机器制造有限公司 | A kind of mechanical pressure loading method being applicable in SPF Technology |
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