CN103033430A - Simulation ultrafast cold test device and test method - Google Patents

Abstract

The invention discloses a simulation ultrafast cold test device and a simulation ultrafast cold test method. The simulation ultrafast cold test device consists of a vacuum tank, a U-shaped groove, a chunk, a clamping fixture, a spray nozzle as well as a support thereof, a gas storage tank, a cold water tank and a water pump. The simulation ultrafast cold test method particularly comprises the steps of arranging an electromagnetic valve installed on a wedge-shaped block in an open state; drawing up and running a test program; taking a test sample as a resistor for electrifying and heating; after heat deformation, cooling the test sample fast for a period of time before the target temperature; starting up the water pump and a gas valve which controls the gas flowing of the gas storage tank, so as to enable cooling water to run in a pipeline and cooling gases to flow out from the gas storage tank, and control the particular advanced time and the sequence for starting up the water pump and the gas valve; and closing the water pump and the gas valve which controls the gas flowing of the gas storage tank. The ultrafast cold simulation device provided by the invention is scientific and reasonable in design, is simple, convenient and feasible to control, improves the cooling capability through three modes of heat transfer, convection as well as radiation, achieves the actual ultrafast cooling technology requirement of simulation production, and provides an effective means for the application and research of the ultrafast cold technology in actual production.

Description

The ultrafast cold test device of a kind of simulation and test method

Technical field

The invention belongs to the thermal modeling test technical field, be specifically related to the ultrafast cold test device of a kind of simulation and test method.

Background technology

Ultra Fast Cooling is that the continuous rolling process in the modern times provides on the austenitic basis of work hardening, with the supper-fast core that is cooled to, carries out supper-fast cooling and stops cooling at dynamic phase trasnsition point rolling the after-hardening austenite, carries out subsequently controlling than Slow cooling.The rolling process for cooling of this technology is used, and has reduced micro alloying element, alloying element, and it is rolling to have avoided low temperature to depress greatly, and the ferrous materials that obtains has the characteristics of function admirable, saving resource and the energy.

Gleeble-3800 hot modeling test machine GU Generic Unit is by the removable U-shaped groove in the vacuum tank, sample, the anvil head, the anchor clamps close contact forms the thermal deformation device, be connected with hydraulic system again, form closed heating circuit and add hydraulic circuit, can carry out the test of various heating and coolings and high temperature tension and compression deformation, be used for simulation heat processing technique process testing, existing GU Generic Unit is not equipped with sample cooling appts, the sample cooling can only conduct to realize by the heat of clamp assembly, cooling power is limited, the fastest cooling velocity of sample is 20 ℃/s, and the range of application of simulation test is restricted.Be difficult to realize that cooling speed is near the ultrafast cold analog functuion of 100 ℃/s.Existing clamp assembly is tungsten carbide anvil head unit, comprises that base, muff, tungsten carbide anvil are first-class, and its overall thermal conductivity can be bad, can not realize the supper-fast cooling of sample.Patent " resistor-type thermal simulation the cartridge device " (patent No.: 03259544.1) propose to be provided with the by-pass water cooling system that improves the sample cooling effect at the anvil headstock, can make chuck obtain water-cooled, improve the cooling effect of sample, increase the sample cooling velocity.But water flowing in the anvil headstock, the sample axial-temperature gradient that can cause being clipped in the middle of the anvil head is large, is out of shape inhomogeneously, makes the hot deformation behavior distortion of sample, and the precision of simulation test is not high, and the effect of its extraordinary simulation test is affected.

Patent " a kind of sampling emergent cooling device of the thermal simulation machine " (patent No.: 200720067245.1) be based on that hydraulic wedge unit that thermal simulation machine is equipped with proposes, one pipeline punishes into four the tunnel at the vacuum cover upper inlet, connected by four flexible pipes, another termination nozzle of flexible pipe, be fixed on the anvil headstock by telescoping shoring column, heat eliminating medium enters nozzle by pipeline and is sprayed on the sample, realizes that sample accelerates cooling.This device shortcoming is that the pressure flow of heat eliminating medium after shunting is limited, and sample cooling velocity increase rate is limited, because it takes up room greatly, is not suitable for using at GU Generic Unit again.

(patent No.: the cartridge device that ZL201120088251.1) proposes is the effect that realizes fast cooling samples by heat radiation and heat conduction to patent " a kind of chuck device of thermal simulation machine ", but only by heat radiation and heat conducting mode be difficult to realize fast cold after at once slow cooling function, can not simulate ultrafast cold technological process, this patent does not propose cooling control method for the ultrafast refrigeration technique of simulation.

Ultrafast refrigeration technique requires to split cold temperature and final cooling temperature is accurately controlled, only be the very short time period of 1-2s cool time, and in this control procedure, often require under a certain specified temp, treating temperature after the cooling fast, although above-mentioned sample cooling appts can be realized the quick cooling of sample, but the control of the precise time that proposes the cooling beginning and finish, often the late effect owing to control makes enforcement cooling action delay when cooling, cause cooling off untimely, when treating temperature, needs often again owing to finish the delay of cooling action, produce the cooling overshoot.Yet the realization of ultrafast refrigeration technique is finished often in a short period of time, if still adopt conventional control method, will inevitably have influence on the accuracy of experiment parameter control, has influence on the follow-up work for inspection of organizing.

Summary of the invention

The present invention discloses the ultrafast cold test device of a kind of simulation and test method, to reproduce the application process of ultrafast refrigeration technique in production reality, uses hot modeling test machine and studies ultrafast refrigeration technique to obtain the desirable microstructure and property of ferrous materials.

The object of the present invention is achieved like this, simulate device that ultrafast cold test method adopts by vacuum tank, U-lag, chuck, jig, nozzle and support thereof, gas-holder, cold water storage cistern, water pump forms, U-lag places in the vacuum tank, described chuck is comprised of two parts: wedge and the anvil head that matches with it, wedge clamps the anvil head and is positioned at U-lag, and held out against by jig, described wedge has 3 holes that communicate, one is equipped with solenoid valve, connecting hose outside all the other two holes, the other end of flexible pipe leads to the outside of vacuum tank, link to each other with water return outlet with the water delivering orifice of cold water storage cistern respectively, form the closed-loop path, the water circuit in this closed-loop path provides power by water pump.

The present invention's mounting bracket on U-lag is used for fixed nozzle, and nozzle is connected with flexible pipe, and the other end of flexible pipe leads to the outside of vacuum tank.

Two cooling jet 30 ~ miter angles of the present invention arrange that be beneficial to convection heat transfer, nozzle is taper.

Gas flow in the gas-holder of the present invention is by the solenoid control that is installed on the flexible pipe.

It is as follows that the present invention simulates ultrafast cold test method concrete steps:

1 solenoid valve that will be installed on the wedge places opening, carry out vacuum pumping, make wedge endoporus and vacuum tank have identical vacuum tightness, the interior vacuum state of wedge this moment can reduce the capacity of heat transmission, when vacuum tightness reaches desired value, close this solenoid valve, pipeline can not leaked because of water flowing.

2 establishment and running test programs as resistance energising heating, because the wedge capacity of heat transmission is relatively poor, reduce sample temperature difference in the axial direction, and uniformity of temperature profile during the sample heat tracing is to guarantee the subsequently homogeneity of distortion.

3, after thermal deformation finishes, fast sample is cooled to a bit of time before the target temperature temperature, open respectively the gas trap of water pump and control gas-holder gas flow, chilled water is moved and refrigerating gas is flowed out by gas-holder in pipeline, the sequencing that concrete time in advance and water pump, gas trap are opened, by the length of the flexible pipe that connects, hydraulic pressure and air pressure determine.

Two sections concrete computation processes of time are as follows respectively:

1) cool cycles water lines horizontal component and vertical length are respectively h, H, and then according to bernoulli principle, all real fluid motion particles that is on the same streamline, its functional value that has all is identical, then has

$P+\frac{1}{2}\mathrm{\ρ}{v}^2+\mathrm{\ρ}gH=C_1---\left(1\right)$

Wherein, P is the pressure of water, and ρ is the density of water, and v is the flow velocity of water, C ₁Be constant (C ₁Bernoulli equation according to fluid motion is determined)

Water is at the vertical part of pipeline and horizontal component flowing time t ₁And t ₂Calculated by following formula respectively:

t ₁=H/v （2）

t ₂=2h/v （3）

With formula (1) substitution formula (2), (3), can obtain the time that cooling circulating water arrives wedge:

$t={\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">t</figure-callout>}}_2=(H+2h)\&times;\sqrt{\frac{\mathrm{\&rho;}}{2(C_{1}P\mathrm{\&rho;}gH)}}---\left(4\right)$

If be t the start-up time of water pump _b, then open in advance the water pump time and be:

${\mathrm{<figure-callout\; id="1"\; label="t\; s"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">t</figure-callout>}}_s={\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+t_b=(H+2h)\&times;\sqrt{\frac{\mathrm{\&rho;}}{2(C_1-P-\mathrm{\&rho;gH})}}+t_b---\left(5\right)$

2) because compressed air quality is less, the length of establishing its flow line is l, then has

$P+\frac{1}{2}{\mathrm{\&rho;}}_0{v_0}^2+{\mathrm{\&rho;}}_{0}gl=C_0---\left(6\right)$

Wherein, P is the pressure of air, ρ ₀Be compressed-air actuated density, v ₀Be the flow velocity of air, C ₀Be constant (Bernoulli equation according to fluid motion is determined)

Pressurized air is at pipeline flowing time t ₀Calculated by following formula:

t ₀=l/v ₀ （7）

(6), (7) formula simultaneous gets:

$t_0=\raisebox{1ex}{$\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">l</figure-callout>}$}\!\left/ \!\raisebox{-1ex}{$\sqrt{\frac{2\&times;(C_{0}P{\mathrm{\&rho;}}_{0}gl)}{{\mathrm{\&rho;}}_0}}$}\right.---\left(8\right)$

If the response time of gas trap is t _d, then open in advance the gas trap time and be:

${\mathrm{<figure-callout\; id="2"\; label="t\; s"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">t</figure-callout>}}_s=\raisebox{1ex}{$\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">l</figure-callout>}$}\!\left/ \!\raisebox{-1ex}{$\sqrt{\frac{2\&times;(C_{0}P{\mathrm{\&rho;}}_{0}gl)}{{\mathrm{\&rho;}}_0}}$}\right.+t_d---\left(9\right)$

4, switch off the pump and control the gas trap of gas-holder gas flow.

Because ultrafast refrigeration technique, after requiring to implement fast cooling, need to treat that temperature is at a certain specific temperature value, and when carrying out this technical modelling experiment, because chilled water and refrigerating gas all have certain pressure, have certain inertia, switch off the pump and when controlling the gas trap of gas-holder gas flow, owing to the existence of this inertia, cause the cooling overshoot phenomenon of sample.For fear of this phenomenon, need to shift to an earlier date a bit of time carries out shutoff operation.

It is the starting mode of pump time that the setting water pump shifts to an earlier date the shut-in time, because the cooling of wedge can not produce considerable influence to the cooling overshoot, can ignore.Then have

t _f1=t _b

Shift to an earlier date the shut-in time for gas trap, can calculate according to following formula:

${\mathrm{<figure-callout\; id="2"\; label="t\; f"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">t</figure-callout>}}_f=l/2\&times;\sqrt{\frac{2\&times;(C_{0}P{\mathrm{\&rho;}}_{0}gl)}{{\mathrm{\&rho;}}_0}}+t_d---\left(10\right)$

Sample can reach the 150 ℃/s of cooling velocity of expectation under the common effect of the thermal convection of the pressure gas that the heat of recirculated water is conducted and cooled off, even higher.

The ultrafast cold analogue means design science of the present invention is reasonable, control simple and easy to do, improve cooling power by heat conduction, convection current and three kinds of modes of radiation, this simulates ultrafast cooling control method can make cooling velocity control precisely, reached simulation and produced actual supper-fast process for cooling requirement, for the applied research in actual production of ultrafast refrigeration technique provides effective means.

Description of drawings

Fig. 1 is the ultra-fast cooling device overall construction drawing;

Fig. 2 is nozzle device structure figure;

Fig. 3 a-d is for switching off the pump in advance and the cooling effect figure of gas trap time;

Fig. 4 is the empirical curve of the specific embodiment of the invention.

Among the figure: 1 nozzle; 2 supports; 3 U-shaped grooves; 4 wedges; 5 jigs; 6 anvil heads; 7 flexible pipes; 8 vacuum tanks; 9 solenoid valves; 10 cold water storage cisterns; 11 water pumps; 12 gas-holder; 13 samples; 14 gas traps.

Embodiment

The present invention is described in detail below in conjunction with accompanying drawing

The present invention simulates the device that ultrafast cold test method adopts and is comprised of vacuum tank, U-lag, chuck, jig, nozzle and support thereof, cold water storage cistern, water pump and gas-holder as shown in Figure 1, U-lag 3 places in the vacuum tank 8, wedge 4 clamps anvil head 6 and is positioned at U-lag 3, and held out against by jig 5, form chuck component, this assembly uses in pairs, and sample 13 is clipped between the two anvil heads 6.Described wedge 4 has 3 holes that communicate, and one is equipped with solenoid valve 9, connecting hose 7 outside all the other two holes.The other end of flexible pipe 7 leads to the outside of vacuum tank 8, links to each other with water return outlet with the water delivering orifice of cold water storage cistern 10 respectively, forms the closed-loop path.Water circuit in this closed-loop path provides power by water pump 11.In the present embodiment temperature is controlled near 0 degree centigrade, it is liquid keeping water.Mounting bracket 2 is used for fixed nozzle 1 on U-lag 3, and nozzle 1 is connected with flexible pipe 7, and the other end of flexible pipe 7 leads to the outside of vacuum tank 8, joins with cold water storage cistern 10.Gas flow in the described gas-holder 12 is by gas trap 14 controls that are installed on the flexible pipe.

As shown in Figure 2, the cooling jet that adopts is up and down miter angle and distributes, and nozzle is taper.Sample 13 reaches the 150 ℃/s of cooling velocity of expectation under the common effect of the thermal convection of the pressure gas that the heat of recirculated water is conducted and cooled off like this, even higher.

It is as follows to adopt said apparatus that sample is simulated its concrete steps of ultrafast cold test:

The solenoid valve 9 that 1, will be installed on the wedge 4 places opening, carry out vacuum pumping, make wedge 4 endoporus have identical vacuum tightness with vacuum tank 8, when vacuum tightness reaches desired value, close this solenoid valve 9, pipeline can not leaked because of water flowing.

2, with Quiksim software and Gleeble text editing lingware (GSL) establishment test routine, sample 13 is heated as the resistance energising, because wedge 4 capacity of heat transmission when vacuum state is relatively poor, sample 13 temperature difference is in the axial direction reduced, uniformity of temperature profile during sample 13 heat tracing is to guarantee the subsequently homogeneity of distortion.

3, gas pressure intensity and chilled water pressure are increased to 7 atmospheric pressure, the hose length of logical refrigerating gas and chilled water is selected respectively 6 meters and 7 meters.

If water is at the vertical part of pipeline and horizontal component flowing time t ₁And t ₂, cool cycles water lines horizontal component and vertical length are respectively h, H,

According to bernoulli principle, all real fluid motion particles that is on the same streamline, its functional value that has all is identical, then has

$P+\frac{1}{2}\mathrm{\&rho;}{v}^2+\mathrm{\&rho;}gH=C_1---\left(1\right)$

Wherein, P is the pressure of water, and ρ is the density of water, and v is the flow velocity of water, C ₁Be constant (C ₁Bernoulli equation according to fluid motion is determined)

t ₁=H/v （2）

t ₂=2h/v （3）

With formula (1) difference substitution formula (2), (3), can obtain the time that cooling circulating water arrives wedge:

$t={\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">t</figure-callout>}}_2=(H+2h)\&times;\sqrt{\frac{\mathrm{\&rho;}}{2(C_{1}P\mathrm{\&rho;}gH)}}---\left(4\right)$

If be t the start-up time of water pump _b, then open in advance the water pump time and be:

$t_{s1}={\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+t_b=(H+2h)\&times;\sqrt{\frac{\mathrm{\&rho;}}{2(C_{1}P\mathrm{\&rho;}gH)}}+t_b---\left(5\right)$

2) because compressed air quality is less, the length of establishing its flow line is l, then has

$P+\frac{1}{2}{\mathrm{\&rho;}}_0{v}_0{}^2+{\mathrm{\&rho;}}_{0}gl=C_0---\left(6\right)$

Wherein, P is the pressure of air, ρ ₀Be compressed-air actuated density, v ₀Be the flow velocity of air, C ₀Be constant (Bernoulli equation according to fluid motion is determined)

Pressurized air is at pipeline flowing time t ₀Calculated by following formula:

t ₀=l/v ₀ （7）

(6), (7) formula simultaneous gets:

$t_0=l/\sqrt{\frac{2\&times;(C_{0}P{\mathrm{\&rho;}}_{0}gl)}{{\mathrm{\&rho;}}_0}}---\left(8\right)$

If the response time of gas trap is t _d, then open in advance the gas trap time and be:

$t_{s2}=l/\sqrt{\frac{2\&times;(C_{0}P{\mathrm{\&rho;}}_{0}gl)}{{\mathrm{\&rho;}}_0}}+t_d---\left(9\right)$

Chilled water arrives wedge 4 and the refrigerating gas arrival 1 used time of nozzle is respectively 0.8s and 0.5s, and therefore, 0.5s opens gas trap 14 at first in advance, opens water pump 11 through 0.3s again.After thermal deformation finishes, in the time of need to implementing supper-fast cooling to sample 13, according to above-mentioned interval time, open successively gas trap 14 and water pump 11;

4, switch off the pump and control the gas trap of gas-holder gas flow.

Because ultrafast refrigeration technique, after requiring to implement fast cooling, need to treat that temperature is at a certain specific temperature value, and when carrying out this technical modelling experiment, because chilled water and refrigerating gas all have certain pressure, have certain inertia, switch off the pump and when controlling the gas trap of gas-holder gas flow, owing to the existence of this inertia, cause the cooling overshoot phenomenon of sample.For fear of this phenomenon, a period of time is carried out shutoff operation in advance.

Because the cooling of wedge can not produce considerable influence to the cooling overshoot, so water pump shifts to an earlier date the shut-in time and can be set as starting mode of pump time t _F1=t _b

Shift to an earlier date the shut-in time for gas trap, can calculate according to following formula:

${\mathrm{<figure-callout\; id="2"\; label="t\; f"\; filenames="DEST\_PATH\_HDA00002727772600025.png"\; state="\{\{state\}\}">t</figure-callout>}}_f=l/2\&times;\sqrt{\frac{2\&times;(C_{0}P{\mathrm{\&rho;}}_{0}gl)}{{\mathrm{\&rho;}}_0}}+t_d---\left(10\right)$

It is (0.5s) that the substitution formula gets the gas trap time

Therefore, 0.5s closes gas trap 14 at first in advance, switches off the pump 11 through 0.3s again.

Listed the cooling effect that the different in advance shut-in times reaches among the accompanying drawing 3a-d, Fig. 3 a is the curve when being zero pre-set time, can find out that cooling has overshoot phenomenon, therefore, need switch off the pump and gas trap in advance; Fig. 3 b is the curve when being 0.3s pre-set time, still have overshoot, but overshoot reduces to some extent; Fig. 3 c is for further switching off the pump in advance and gas trap, time advance 0.7s can be found out that cooling curve does not have overshoot phenomenon, but cooling power is not enough to some extent, Fig. 3 d is the open and close water pump that draws according to formula and the curve of gas trap, there are not overshoot and not enough phenomenon, considering the cooling curve situation among Fig. 3 a-d, is accurately by switching off the pump of drawing of formula (10) and gas trap time as seen.

Based on the parameter that above-mentioned fast cooling device and fast cooling method adopt, carried out following simulated experiment, the empirical curve that obtains can find out in cooling velocity to reach 120 as shown in Figure 4---during 150 ℃/s, actual value is consistent fully with setting value.

Simulated experiment is 1.: under vacuum state, sample is raised to 1150 ℃ with the speed of 20 ℃/S, after being incubated 4 minutes, drop to 1000 ℃ with 2 ℃/S, with 5/S speed, 30% deflection compresses sample, then drop to 850 ℃ with 5/S speed with 2 ℃/S, 60% deflection compresses sample, drops to 600 ℃ of insulations 2 seconds with 120 ℃/S, is as cold as room temperature with 5 ℃/S again.

Simulated experiment is 2.: under vacuum state, sample is raised to 1150 ℃ with the speed of 20 ℃/S, after being incubated 5 minutes, drop to 1000 ℃ with 5 ℃/S, with 5/S speed, 30% deflection compresses sample, then drop to 850 ℃ with 5/S speed with 2 ℃/S, 60% deflection compresses sample, drops to 650 ℃ of insulations 2 seconds with 150 ℃/S, is as cold as room temperature with 20 ℃/S again.

Claims (7)

1. simulate ultrafast cold test device for one kind, it is characterized in that, it is by vacuum tank, U-lag, chuck, jig, nozzle and support thereof, gas-holder, cold water storage cistern, water pump forms, U-lag places in the vacuum tank, described chuck is comprised of two parts: wedge and the anvil head that matches with it, wedge clamps the anvil head and is positioned at U-lag, and held out against by jig, described wedge has 3 holes that communicate, and one is equipped with solenoid valve, connecting hose outside all the other two holes, the other end of flexible pipe leads to the outside of vacuum tank, link to each other with water return outlet with the water delivering orifice of cold water storage cistern respectively, form the closed-loop path, the water circuit in this closed-loop path provides power by water pump.

2. the ultrafast cold test device of described a kind of simulation according to claim 1 is characterized in that, mounting bracket is used for fixed nozzle on the described U-lag, and nozzle is connected with flexible pipe, and the other end of flexible pipe leads to the outside of vacuum tank, joins with cold water storage cistern.

3. the ultrafast cold test device of described a kind of simulation according to claim 1 is characterized in that, cooling jet is up and down 30 ~ miter angle and distributes, and nozzle is the needle-like with pin hole.

4. the ultrafast cold test device of described a kind of simulation according to claim 1 is characterized in that gas-holder is connected with solenoid valve through flexible pipe.

5. an employing such as the described a kind of test method of simulating ultrafast cold test device of claim 1 to 4 any one is characterized in that concrete steps are as follows:

The solenoid valve that 1) will be installed on the wedge places opening, carry out vacuum pumping, make wedge endoporus and vacuum tank have identical vacuum tightness, the interior vacuum state of wedge this moment can reduce the capacity of heat transmission, when vacuum tightness reaches desired value, close this solenoid valve, pipeline can not leaked because of water flowing;

2) establishment and running test program as resistance energising heating, because the wedge capacity of heat transmission is relatively poor, make sample sample temperature difference in the axial direction reduce uniformity of temperature profile during the sample heat tracing;

3) after thermal deformation finishes, fast sample is cooled to a period of time before the target temperature, open respectively the gas trap of water pump and control gas-holder gas flow, chilled water is moved and refrigerating gas is flowed out by gas-holder in pipeline, the sequencing that concrete time in advance and water pump, gas trap are opened, by the length of the flexible pipe that connects, hydraulic pressure and air pressure determine;

4) switch off the pump and control the gas trap of gas-holder gas flow.

6. the ultrafast cold test device experiment of a kind of simulation according to claim 5 method is characterized in that, it is as follows respectively to open in advance two concrete computation processes of time period of water pump, gas trap:

1) cool cycles water lines horizontal component and vertical length are respectively h, H, and then according to bernoulli principle, all real fluid motion particles that is on the same streamline, its functional value that has all is identical, then has

$P+\frac{1}{2}\mathrm{\&rho;}{v}^2+\mathrm{\&rho;}gH=C_1---\left(1\right)$

Wherein, P is the pressure of water, and ρ is the density of water, and v is the flow velocity of water, C ₁Be constant, C ₁Bernoulli equation according to fluid motion is determined;

Water is at the vertical part of pipeline and horizontal component flowing time t ₁And t ₂Calculated by following formula respectively:

t ₁=H/v （2）

t ₂=h/v （3）

With formula (1) substitution formula (2), (3), can obtain the time that cooling circulating water arrives wedge:

$t=t_1+t_2=(H+2h)\&times;\sqrt{\frac{\mathrm{\&rho;}}{2(C_{1}P\mathrm{\&rho;}gH)}}---\left(4\right)$

If be t the start-up time of water pump _b, then open in advance the water pump time and be:

$t_{s1}=t_1+t_2+t_b=(H+2h)\&times;\sqrt{\frac{\mathrm{\&rho;}}{2(C_{1}P\mathrm{\&rho;}gH)}}+t_b---\left(5\right)$

2) because compressed air quality is less, the length of establishing its flow line is l, then has

$P+\frac{1}{2}{\mathrm{\&rho;}}_0{v}_0{}^2+{\mathrm{\&rho;}}_{0}gl=C_0---\left(6\right)$

Wherein, P is the pressure of air, ρ ₀Be compressed-air actuated density, v ₀Be the flow velocity of air, C ₀Be constant

Pressurized air is at pipeline flowing time t ₀Calculated by following formula:

t ₀=l/v ₀ （7）

(6), (7) formula simultaneous gets:

$t_0=l/\sqrt{\frac{2\&times;(C_{0}P{\mathrm{\&rho;}}_{0}gl)}{{\mathrm{\&rho;}}_0}}---\left(8\right)$

If the response time of gas trap is t _d, then open in advance the gas trap time and be:

$t_{s2}=l/\sqrt{\frac{2\&times;(C_{0}P{\mathrm{\&rho;}}_{0}gl)}{{\mathrm{\&rho;}}_0}}+t_d---\left(9\right)$

7. the ultrafast cold test device experiment of a kind of simulation according to claim 5 method is characterized in that,

Switch off the pump in advance, concrete computation process of time of gas trap is as follows respectively:

It is starting mode of pump time, i.e. t that the setting water pump shifts to an earlier date the shut-in time _F1=t _b

Gas trap shifts to an earlier date the shut-in time, calculates according to following formula:

$t_{f2}=l/2\&times;\sqrt{\frac{2\&times;(C_{0}P{\mathrm{\&rho;}}_{0}gl)}{{\mathrm{\&rho;}}_0}}+t_d---\left(10\right)$

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