CN204679435U - Tool and mould heat fatigue tester for testing - Google Patents
Tool and mould heat fatigue tester for testing Download PDFInfo
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- CN204679435U CN204679435U CN201520282605.4U CN201520282605U CN204679435U CN 204679435 U CN204679435 U CN 204679435U CN 201520282605 U CN201520282605 U CN 201520282605U CN 204679435 U CN204679435 U CN 204679435U
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Abstract
The utility model discloses a kind of tool and mould heat fatigue tester for testing, comprise frame, heating system, cooling system and control system; Above frame, elevating mechanism is installed, places heating system in frame, below heating system, be provided with cooling system; Control system is connected with heating system, cooling system, elevating mechanism.Thermal fatigue test apparatus of the present utility model is simple and reliable for structure, easy to operate.
Description
Technical field
The utility model relates to a kind of thermal fatigue property pick-up unit of material, particularly relates to a kind of tool and mould heat fatigue tester for testing.
Background technology
Load with when cooling fast when mould or hot junction workpiece stand periodic heat, produce pulsating stress or cyclic strain because its free expansion and contraction suffer restraints, finally cause chapping and the phenomenon of destruction is called heat fatigue.
In actual use, die surface contacts with high temperature machined material and heat eliminating medium hot-work die repeatedly, makes mold surface temperature generation change repeatedly, thus causes die surface to produce periodically variable alterante stress and strain.When after the metal that hot-work die type intracavity contact is red-hot, mold surface temperature raises rapidly, makes mold surface temperature higher than internal temperature, and the expansion of die surface will be subject to the suppression of mould inside thus produce compressive stress and compressive strain at die surface; On the contrary, when forming metal is taken out in hot-work die die cavity, mold surface temperature declines rapidly (general employing is sprayed or water-spraying control), and the contraction of die surface will be subject to the suppression of mould inside equally thus produce tension and stretching strain at die surface.Under the effect of this alternating thermal stress, the Microstructure and properties of mould changes gradually.When the thermal stress of die surface exceedes the yield strength of material, generation plastic yield causes producing heat fatigue cracking by die surface the most at last.
Illustrate: (1) hot forged mould plays a part very important in automobile making, when tide of motorism forging mould is applied to the rough forge stage of axle class blank, because blank temperature reaches 1200 ~ 1300 DEG C, the workplace of hot-work die often directly contacts with high temperature blank, and the transient temperature of mold cavity can reach 600 ~ 700 DEG C.In addition, need in mold work to adopt water-spraying control, the duration, greatly about 0.2 ~ 0.4s, makes mould produce periodic temperature variation at work like this, and the circulation that colds and heat succeed each other easily causes heat fatigue; (2) roll of hot rolling, nip when being rolled material in it once rotates, the temperature of roller surface rises, and after material is hauled out, roller temperature declines again, after experience several times heating and cooling circulation, roller surface is subject to Thermal Fatigue Damage and produces be full of cracks and peel off; (3) pressure casting is the main forging type of the non-ferrous alloy such as aluminium alloy, magnesium alloy, applies to the fields such as automobile, aviation, digital electronic goods widely.Die casting is the most critical parts of die casting, but aluminum alloy mould is subject to when pouring into a mould swashing heat, and the Quench of being sprayed when die sinking, heat fatigue will occur after standing the circulation of certain number of times; (4) in glassware production run, gob feeder is by the melten glass material of about 1100 DEG C by sending in glass mold, and heat is diffused into outside by mould, and cooling fast, die sinking obtain the glassware of about 600 DEG C.Therefore, under high temperature circulation, mold cavity surfaces temperature fluctuation and neighbouring temperature inequality, cause dies cavity stress field complicated, impels mould to produce micro-crack and metaplasia, cause the Under Thermal Fatigue Damage of glass mold.
Present stage at home, the thermal fatigue property of material is measured mainly through thermal fatigue test, what test unit mainly adopted is Gleeble heat/power simulation test machine that DSI company of the U.S. introduces, and each side data measured by this testing machine can reach the requirement needed for commercial production in the thermal fatigue property of test material.But, because this testing machine is powerful, therefore operate relatively complicated; The cost of testing machine itself is high in addition, completes the required expense paid of once experiment costly; Temperatures as high more than 1000 DEG C during the metal liquid die forging such as copper and cast steel, simulate the serviceable life of similar technogenic influence heat simulating tester, in addition, other thermal fatigue test device more domestic is relatively simple and easy, need manual operation, control system is stable not, and automatic control ability is not strong, and these problems bring a lot of puzzlements to some enterprises and unit.
Utility model content
Problem to be solved in the utility model is the weak point overcoming existing test unit, for complicated operation, the problem that cost is high of existing thermal fatigue test apparatus, provides a kind of tool and mould heat fatigue tester for testing.In practicality, this device can meet experiment demand and commercial production, and this device is compared operation is simpler, cost is lower, higher test temperature and can be realized the automatic control of process of the test with existing testing machine in addition.
The utility model solves the technical scheme that its technical matters adopts:
A kind of tool and mould heat fatigue tester for testing is provided, comprises frame, heating system, cooling system and control system; Above frame, elevating mechanism is installed, places heating system in frame, below heating system, be provided with cooling system; Control system is connected with heating system, cooling system, elevating mechanism.
In device described in the utility model, heating system comprises heating furnace, and the body of heater of heating furnace comprises furnace shell, heating chamber, heating element, burner hearth, furnace lining and air cooling equipment, arranges high temperature alloy silk and thermopair in heating furnace.
In device described in the utility model, cooling system comprises cooling bath, is provided with inlet and outlet pipe lines in cooling bath.
In device described in the utility model, control system comprises switch board, comprises control circuit, counter, temperature control instrument, timer, charging key, registering instrument, adds hot key, cools key, temperature detect switch (TDS) and automatic control switch in switch board.
In device described in the utility model, elevating mechanism comprises servomotor, ball screw slide unit and hanging clamp.
The beneficial effect that the utility model produces is: the thermal fatigue test apparatus that the utility model provides is simple and reliable for structure, easy to operate.Compared with existing gleeble testing machine, enormously simplify the structure of thermal fatigue test apparatus, reduce experimentation cost.Clamping device accurate positioning, reliable.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the structural representation of tool and mould heat fatigue tester for testing.
Fig. 2 is the structure diagram of tool and mould heat fatigue tester for testing.
In Fig. 1: 1 servomotor, 2 ball screw slide units, 3 hanging clamps, 4 workpiece, 5 frames, 6 heating furnaces, 7 cooling baths, 8 feets, 9 counters, 10 switch boards, 11 temperature control instruments, 12 timers, 13 charging keys, 14 registering instruments, 15 add hot key, 16 cooling keys, 17 temperature detect switch (TDS)s, 18 automatic control switchs.
In Fig. 2: 19 elevating mechanisms, 20 control system, 21 stabilized voltage supplys, 22 heating systems, 23 cooling systems.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, the utility model provides a kind of thermal fatigue test apparatus, and this device mainly comprises elevating mechanism, clamping device, heating system, cooling system and control system.
Servomotor 1, as the power source of whole experimentation, is fixed in the frame 5 of test unit by screw, in the top of frame 5, as shown in Figure 1.Servomotor 1, ball screw slide unit 2 and hanging clamp 3 constitute the elevating mechanism of testing machine, servomotor, ball screw slide unit, hanging clamp from top to bottom successively, servomotor provides power, and hanging clamp completes the clamping to workpiece, and ball screw slide unit ensures the stability of transmission.Heating system comprises heating furnace 6, the body of heater of heating furnace 6 is made up of furnace shell, heating chamber, heating element, burner hearth, furnace lining, air cooling equipment etc., ragged edge be furnace shell, heating chamber is positioned at furnace shell, have burner hearth inside heating chamber, heating element, furnace lining and air cooling equipment are positioned at inside burner hearth.Cooling device is then formed primarily of cooling bath 7, in cooling bath, have inlet and outlet pipe lines, ensure that the efficiency to work-piece cools.
Hanging clamp 3 is the retained part of whole device, before carrying out thermal fatigue test, first workpiece 4 is arranged in hanging clamp 3, the axis of holding workpiece and the axis of bare terminal end are on same vertical curve, sample is touched with hand hammer, when sample reaches precalculated position, turn trip bolt makes the medial surface of workpiece 4 and hanging clamp 3 inconsistent, so just achieves the installation of workpiece and fastening.When off-test, first screw out trip bolt, then eject screw by precession, sample just can unload from hanging clamp 3.
In whole test, the thermal fatigue resistance of material can be evaluated respectively by following several scheme:
1, in experimentation, record organizes the crack length a of sample and corresponding cycle index N, simulates a-N curve, then evaluate according to curve tendency by the method for regretional analysis.
2, first specify the length of crackle before experiment, record reaches cycle index during regulation crack length, and the mensuration mold use life-span evaluates.
3, first specify cycle index before experiment, record reaches crack length during regulation cycle index, compares crack length to evaluate.
Carry out stage to specimen surface crackle in experimentation to take pictures sampling, and then the outward appearance that can record sample in whole test destroys situation, also can observe the object reaching evaluation to the experimental phenomena occurred in whole process of the test.
In thermal fatigue test apparatus of the present utility model, as shown in Figure 1, control system 20 is made up of the control circuit of switch board 10 and inside thereof, and switch board 10 comprises counter 9, temperature control instrument 11, timer 12, charging key 13, registering instrument 14, adds hot key 15, cooling key 16, temperature detect switch (TDS) 17 and automatic control switch 18.Registering instrument 14 sum counter 9 is with the use of the object reaching display record number of times, charging key 13 is for controlling hanging clamp, control installation and the unloading of workpiece, add hot key 15 to control heating system and preset the temperature that temperature control instrument shows in conjunction with temperature detect switch (TDS) 17, test temperature needed for acquisition, cooling key 16 is for the operation of Controlled cooling system, and automatic control switch 18 is for activating internal PLC automatic control system, preset experiment number or time by registering instrument, testing machine will complete follow-up test automatically.
Thermal fatigue test apparatus of the present utility model may be used for thermal fatigue test in some forming processes such as forge hot, hot rolling, pressure casting, also may be used for various chemical material, fire resistive material, the test of powdered metallurgical material sinteringization in addition.
The heating element of heating furnace 6 adopts high temperature alloy silk, can Long-Time Service 900 DEG C.When selecting heating element except guarantee stove power, focus on the physical life of element especially.Low-voltage power supply, a district controls, wiring, and ensure that the homogeneity of fire box temperature, eduction rod, the stove outer covering end of element are all provided with protective cover, to ensure safety in production.
Temperature element adopts K type thermopair, has reaction fast, the feature of long service life.This testing machine has two thermopairs, a control temperature, and a monitoring workpiece temperature, measurement range is 0 ~ 1300 DEG C.
Servomotor 1 possesses detent and balance device.
The burner hearth of heating furnace 6 adopts crystalline ceramic fiber to form, and furnace lining is made up of refractory fibre and stainless steel thermoscreen.There is quick heating, be incubated good feature.Heating furnace 6 furnace shell adopts numerically-controlled machine processing and fabricating to form primarily of the thick Q235 steel plate of 2mm and composite plastic, has enough intensity and rigidity, and structure is exquisite.
Take into full account cost and handled easily, therefore adopt timer, counter, the time relay, servomotor, PLC to control, the time relay is the core parts of timer, reaches the object of timing, and time showing can be converted into counting display by the time of setting needed for single.This mode can carry out the setting of random time and cycle index on panel.Owing to considering lifting number of times and degree of stability, this form of servo ball screw slide unit must be adopted.
Control system 20 comprises regulator temperature-controlling system and dcs, ensure that high temperature furnace temperature control system safety, operates in reliably, steadily, efficiently, economically in the range of control of furnace temperature setting value X ± 1 DEG C.Adopt temperature control instrument, 30 sections of temperature programmed controls.
Temperature control system adopts advanced AI artificial intelligence regulating algorithm, non-overshoot, possess self-setting function, the heating-cooling that can realize any slope controls, have redirect, operation, time-out and stopping etc. able to programme/can operational order, input adopts figure adjustment system, measuring accuracy is up to 0.2 grade, and super upper limit alarm and input pull-down are reported to the police, and have power failure tupe, measured value start-up performance and preparatory function, make program perform more efficient and more perfect.
Control system 20 have employed EPROM chip, also can reliably preserve when making the various data of input in instrument power-off and be interfered.Temperature control record adopts single color LCD display and control recording instrument without paper, and collection records and is controlled in all over the body, has the signals such as flow, thermopair, thermal resistance, normal voltage and normalized current.There is the output functions such as formula control, warning, feed.Real-time curve display, history curve display, alarm inquiry, alarm condition display etc.Inquire about on data importing computing machine by USB flash disk.
The advantage of thermal fatigue test apparatus provided by the invention is:
(1) reach test demand and industrial while, test unit is simple and reliable, easy to operate.
(2) compared with existing gleeble testing machine, enormously simplify the structure of thermal fatigue tester, reduce experimentation cost.
(3) experimentation can Automated condtrol and control system be stablized, clamping device accurate positioning, reliable.
(4) be provided with self feed back in control system, can automatically record experimental data and test number (TN).
(5) higher experimental temperature can be realized.
Embodiment 1
In thermal forging technology process, heat fatigue is one of the most general failure mode of hot-work die, is the principal element in restriction hot-work die serviceable life.At present, the mold use life-span is improved mainly through the surface overlaying coating at mould.Heat fatigue cracking is the form of expression of mould under heat fatigue load, and we organize the crack length a of sample and corresponding cycle index N by record in test, draw out a-N curve, carry out the thermal fatigue resistance of duplicate.
In experiment, select H13 steel as matrix material, clad material is selected and is Ni-basedly carried out built-up welding, prepares 3 pieces, sample, and carries out label A1, A2, A3 to sample respectively, cycle index is set to 500,800,1000 respectively, heating-up temperature is set as 800 DEG C, temperature retention time 30s, cool time 5s, the type of cooling: misting cooling, heat eliminating medium adopts metalworking coolant.
Concrete test procedure is as follows:
1, Sample A 1 is installed, uses the hanging clamp 3 in Fig. 1 that sample is fastening, complete the installation of sample.
2, startup adds hot key 15, and sample drops in heating furnace 6 and heats under the driving of elevating mechanism, is incubated when temperature rises to 800 DEG C, and setting temperature retention time 30s uses timer 9 to record temperature retention time.
3, start cooling key 16, sample drops in cooling bath 7 and cools under the driving of elevating mechanism, and cool time, 5s, used timer record cool time.
4, start automatic control switch 18, setting cycle index N is 500 times, and testing machine, by automatically completing 500 test cycles, alleviates the workload of experimenter greatly, ensure that the accuracy of test.
5, after sample cools completely, unload Sample A 1, measure and record the length a1 of heat fatigue cracking.
6, same, measure and record crack length a2, a3 of A2, A3 respectively, close test unit, test basic operation part completes.
Embodiment 2
In hot rolled process, high temperature rolled piece and heat eliminating medium breaker roll surface produce violent thermal shock, and long-term circulation is gone down, and roller surface is subject to Thermal Fatigue Damage and produces be full of cracks and peel off.In experimentation, first specify the length of crackle, record reaches cycle index during regulation crack length, measures the serviceable life of roll, evaluates the thermal fatigue resistance of material with this.
In experiment, experiment material selects rich chromium cast iron, regulation crack length a1, heating-up temperature 700 DEG C, temperature retention time 3s, cool time 2s, the type of cooling: misting cooling, heat eliminating medium: water.
Concrete experimental procedure, with reference to embodiment 1, finally records cycle index N when reaching regulation crack length, and measures the serviceable life of roll.
Embodiment 3
In extrusion process process, aluminum alloy mould is subject to when pouring into a mould swashing heat, and the Quench of being sprayed when die sinking, heat fatigue will occur after standing the circulation of certain number of times.In experimentation, first specify cycle index, record reaches crack length during regulation cycle index, compares crack length to evaluate the heat resistanceheat resistant crack performance of material.
In experiment, experiment material aluminium alloy, setting cycle index 1500 times, heating-up temperature 800 DEG C, temperature retention time 12s, cool time 10s, the type of cooling: water-spraying control, heat eliminating medium: water.
Concrete experimental procedure, with reference to embodiment 1, finally records crack length when reaching the cycle index of regulation, the crack length recorded and existing standard is compared, evaluate the thermal fatigue resistance of material with this.
Embodiment 4
In glassware production run, goods are at in-mold molding, and the melten glass that mould then will stand about 1100 DEG C circulates to the fast temperature of about 600 DEG C moulded products of depanning, goes down for a long time and then causes the Under Thermal Fatigue Damage of glass mold.
In experiment, experiment material selects spheroidal-graphite cast iron, cycle index: 1200 times, heating-up temperature: 900 DEG C, temperature retention time: 5s, cool time: 3s, the type of cooling: misting cooling, heat eliminating medium: water.
Concrete experimental procedure is with reference to embodiment 1, and sampling of taking pictures interim in experimentation, observes the whole process that specimen surface crackle generates, by evaluating more intuitively the thermal fatigue resistance of destruction situation to material of specimen surface.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to the utility model claims.
Claims (5)
1. a tool and mould heat fatigue tester for testing, is characterized in that, comprises frame, heating system, cooling system and control system; Above frame, elevating mechanism is installed, places heating system in frame, below heating system, be provided with cooling system; Control system is connected with heating system, cooling system, elevating mechanism.
2. device according to claim 1, is characterized in that, heating system comprises heating furnace, and the body of heater of heating furnace comprises furnace shell, heating chamber, heating element, burner hearth, furnace lining and air cooling equipment, arranges high temperature alloy silk and thermopair in heating furnace.
3. device according to claim 1, is characterized in that, cooling system comprises cooling bath, is provided with inlet and outlet pipe lines in cooling bath.
4. device according to claim 1, it is characterized in that, control system comprises switch board, comprises control circuit, counter, temperature control instrument, timer, charging key, registering instrument, adds hot key, cools key, temperature detect switch (TDS) and automatic control switch in switch board.
5. device according to claim 1, is characterized in that, elevating mechanism comprises servomotor, ball screw slide unit and hanging clamp.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520282605.4U CN204679435U (en) | 2015-05-05 | 2015-05-05 | Tool and mould heat fatigue tester for testing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520282605.4U CN204679435U (en) | 2015-05-05 | 2015-05-05 | Tool and mould heat fatigue tester for testing |
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| CN204679435U true CN204679435U (en) | 2015-09-30 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758758A (en) * | 2016-02-29 | 2016-07-13 | 江苏科技大学 | Thermal fatigue testing machine |
| CN105784527A (en) * | 2016-05-04 | 2016-07-20 | 武汉理工大学 | Heat-force coupled fatigue and wear accelerated testing apparatus and method |
| CN107328646A (en) * | 2017-06-20 | 2017-11-07 | 武汉理工大学 | A kind of hot extrusion abrasion accelerated test method and coating die failure prediction experiment device |
| CN111157566A (en) * | 2020-01-03 | 2020-05-15 | 北京科技大学 | Multifunctional full-automatic material thermal fatigue testing machine |
| CN114062415A (en) * | 2021-10-14 | 2022-02-18 | 首钢集团有限公司 | Thermal fatigue testing machine control method and thermal fatigue testing machine |
-
2015
- 2015-05-05 CN CN201520282605.4U patent/CN204679435U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758758A (en) * | 2016-02-29 | 2016-07-13 | 江苏科技大学 | Thermal fatigue testing machine |
| CN105758758B (en) * | 2016-02-29 | 2019-03-29 | 江苏科技大学 | A kind of thermal fatigue tester |
| CN105784527A (en) * | 2016-05-04 | 2016-07-20 | 武汉理工大学 | Heat-force coupled fatigue and wear accelerated testing apparatus and method |
| CN105784527B (en) * | 2016-05-04 | 2018-08-07 | 武汉理工大学 | A kind of Acceleration study device and method of thermal stress coupling fatigue/abrasion |
| CN107328646A (en) * | 2017-06-20 | 2017-11-07 | 武汉理工大学 | A kind of hot extrusion abrasion accelerated test method and coating die failure prediction experiment device |
| CN111157566A (en) * | 2020-01-03 | 2020-05-15 | 北京科技大学 | Multifunctional full-automatic material thermal fatigue testing machine |
| CN114062415A (en) * | 2021-10-14 | 2022-02-18 | 首钢集团有限公司 | Thermal fatigue testing machine control method and thermal fatigue testing machine |
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Granted publication date: 20150930 Termination date: 20200505 |