CN102980790A - Test device and method for high-temperature shot blasting - Google Patents
Test device and method for high-temperature shot blasting Download PDFInfo
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- CN102980790A CN102980790A CN201210506593XA CN201210506593A CN102980790A CN 102980790 A CN102980790 A CN 102980790A CN 201210506593X A CN201210506593X A CN 201210506593XA CN 201210506593 A CN201210506593 A CN 201210506593A CN 102980790 A CN102980790 A CN 102980790A
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Abstract
The invention provides a test device for high-temperature shot blasting. The test device comprises an air compression system, a high-pressure air heating gun, a spray gun, a material storage tank, a sample rotating mechanism, a sample clamping tool and a sample temperature measuring system, wherein the air compression system, the high-pressure air heating gun and the spray gun are connected in sequence; the spray gun is arranged below the high-pressure air heating gun; the side surface of the spray gun is connected with the material storage tank; the lower side of the spray nozzle of the spray gun is aligned with a sample clamped by the sample clamping tool; the sample clamping tool is fixed on the sample rotating mechanism; the sample temperature measuring system is connected with the sample clamping tool; and the sample temperature measuring system is used for testing the temperature of the sample at any time. The invention further provides a corresponding method. According to the test device and method provided by the invention, the highest shot blasting temperature reaches 400 DEG C to facilitate improvement of plasticity of magnesium alloy and improvement of deformability. Moreover, the temperature of the sample is measured under the shot blasting condition, and precision of the experiment is improved; and besides, shot blasting is carried under a very small negative pressure, and the lowest shot blasting strength reaches 0.05 mmN.
Description
Technical field
The present invention relates to a kind of device of technical field of processing metallic materials, especially a kind of magnesium alloy sample is carried out the high temperature shot-peening machine that surface deformation strengthening is processed, be specifically related to test unit and the method for high temperature shot-peening.
Background technology
Fatigue break is the topmost form that mechanical component and engineering component destroy always.In the fields such as Aero-Space, shipbuilding, chemical machinery, communications and transportation, engineering machinery, there is approximately the structural strength destruction more than 50～90% to be caused by fatigure failure.Magnesium alloy is as the very large metal material of a kind of development potentiality, and the improvement of fatigue behaviour is conducive to enlarge its application.As everyone knows, shot blast is the raising metal material fatigue strength commonly used and the method for fatigue lifetime, and in recent years, some scientific workers attempt improving with stress peening method the fatigue behaviour of magnesium alloy, obtain some achievements in research, but also faced many difficulties.This is main relevant with the crystal structure of magnesium alloy, and most magnesium alloys have the Patterns for Close-Packed Hexagonal Crystal structure, and when being lower than 498K, the plasticity of polycrystalline magnesium only limits to basal plane { 0001}
Slippage and
Twin, during magnesium alloy deformation owing to only have three how much slip systems and two independent slip systems, the cold plastic deformation difficulty, and matrix hardness is low, the surface is difficult to bear severe plastic deformation, though the low-intensity shot-peening can improve fatigue behaviour greatly, the higher-strength shot-peening can cause surface imperfection and produce micro-crack, so the magnesium alloy shot peening strengthening surface effect of having reported at present is also undesirable.And when being higher than 498K, the additional glide plane of magnesium alloy
With
Start, be conducive to distortion, plasticity is improved, and is easy to the processing that is shaped.Therefore, if under the hot conditions magnesium alloy is carried out shot peening, namely high temperature shot-peening can more effectively improve its fatigue behaviour.
Find through the literature search to prior art, " the Optimized warm peening of the quenched and tempered steel AISI 4140 " that R.Menig delivers at " Materials science and engineering A " (2002,335 phase 198-206 pages or leaves) mention a kind of high temperature shot-peening device, this device adopts burner hearth and High Temperature Gas Hybrid Heating pattern, and maximum temperature is 290 degree.But this device can't make sample obtain the whirligig of even shot-peening, and clamping unloading sample is inconvenient, also be not used for measuring sample at the device of shot-peening process temperature, and this apparatus structure is complicated, and volume is large.
Summary of the invention
The present invention is directed to above-mentioned deficiency of the prior art, a kind of compressed air shotblasting machine that can alloy axle class sample carries out high temperature shot-peening under rotation status is provided, improve the homogeneity of specimen surface shot-peening.Simple according to apparatus structure provided by the present invention, clamping unloading alloy axle class sample can be measured temperature, thereby make alloy axle class sample obtain best shot blasting effect in alloy axle class sample high temperature shot-peening easily.
According to an aspect of the present invention, a kind of test unit of high temperature shot-peening is provided, comprise air compression system, the pressure-air heating gun, spray gun, storage tank, the sample rotating mechanism, the sample holder instrument, the measuring sample temperature system, wherein, air compression system, the pressure-air heating gun, spray gun connects successively, spray gun places pressure-air heating gun below, the spray gun side links to each other with storage tank, spray tip aligned beneath sample holder instrument clamping sample, the sample holder instrument is fixed on the sample rotating mechanism, the measuring sample temperature system connects the sample holder instrument, and the measuring sample temperature system is used for the at any time temperature of test sample.
Preferably, described air compression system comprises air compressor, carries tracheae, recirculated water cooler, and air compressor is by carrying tracheae to be connected on the recirculated water cooler, and the recirculated water cooler links to each other with heat gun.
Preferably, described pressure-air heating gun is used for the temperature of gases at high pressure is heated to about 1000 degrees centigrade, forms high temperature and high pressure gas.
Preferably, described pressure-air heating gun comprises rifle body, electrical heating elements and thermopair, wherein the rifle body is made by stainless steel, the external face of rifle uses thermal insulation material to be incubated, and electrical heating elements is arranged in the rifle body, and the thermopair that is used for measuring the temperature of gas port places rifle body front end.
Preferably, described spray gun is by making for stainless steel material, and the spray gun outside is provided be used to the muff that prevents that temperature is scattered and disappeared.
Preferably, described storage tank is the cylindrical shape of opening, material is stainless steel, be heated by resistive the circle heating on every side, in 500 degrees centigrade of scopes, can carry out temperature control, storage tank connects spray gun by conveying pipeline, on the conveying pipeline of storage tank below blow-off valve is installed, and blow-off valve is used for according to shot peening strength size adjustment sediment outflow amount.
Preferably, described sample rotating mechanism comprises rotary electric machine, frequency modulator, platform, rotation axis, and rotary electric machine is fixed on the platform after connecting frequency modulator, and rotary electric machine links to each other with rotation axis, and rotary electric machine is used for driving sample and at the uniform velocity rotates.
Preferably, described sample holder instrument comprises tack dog screw, specimen holder, sleeve pipe chuck, the tack dog screw that is installed on the specimen holder is used for fixedly sample, specimen holder is fixed on the sleeve pipe chuck by the tack dog screw, and the sleeve pipe chuck is fixed on by point set screw on the post that is located by connecting of rotation axis of sample rotating mechanism.
Preferably, described measuring sample temperature system comprises temperature probe, sense line and temperature measurer, and an end of temperature probe is deep in the middle of the sample holder instrument clamping sample, and the temperature probe other end connects temperature measurer by sense line.
According to another aspect of the present invention, a kind of test method of high temperature shot-peening also is provided, heat in advance storage tank, make blasting media reach temperature required, again with air compressor with air pressurized after 1.5 MPas, after carrying tracheae to enter the high temperature and high pressure gas that the pressure-air heating gun is heated to be 1000 degrees centigrade, the process lance ejection is on sample, utilize simultaneously frequency modulator Control Assay rotating mechanism to make sample by certain rotational speed, treat that sample rises to predetermined temperature, open the blow-off valve under the storage tank, utilize High Temperature High Pressure air flow at high speed in spray gun to form the ejector action that negative pressure produces, the ejection blasting media strikes on the sample, guarantees thermally equivalent and even shot-peening.
When the present invention works, heat in advance storage tank, make blasting media reach temperature required, again with air pressurized to more than 1.5 MPas, enter the pressure-air heating gun through conveyance conduit, after becoming high temperature and high pressure gas, the process lance ejection is on axle class sample, simultaneously, open rotary switch rotation axis is rotated, treat that sample rises to predetermined temperature, open the blow-off valve under the storage tank, utilize High Temperature High Pressure air flow at high speed in spray gun to form the ejector action that negative pressure produces, ejection high temperature ball body penetrates and strikes on the magnesium alloy standard axle class sample.Guarantee thermally equivalent and even shot-peening.
Compared with prior art, the present invention has following beneficial effect: the present invention adopts high temperature and high pressure gas to carry out shot-peening, and the highest shot-peening temperature reaches 400 degrees centigrade, satisfy magnesium alloy sample and start additional glide plane, be conducive to the raising of magnesium alloy plasticity, improve deformability, widen the shot-peening action pane.The design of temperature measurement system can be measured the temperature of sample in the situation of rotation, improved the degree of accuracy of experiment.Material storing box is positioned at spray gun top, can be under very little negative pressure shot-peening, minimum shot peening strength can reach 0.05mmN.
Description of drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is the structural representation according to the test unit of high temperature shot-peening provided by the invention;
Fig. 2 is the structural representation according to the specimen temperature test macro in the test unit of high temperature shot-peening provided by the invention and sample holder instrument;
Fig. 3 is the structural representation according to the pressure-air heating gun in the test unit of high temperature shot-peening provided by the invention.
Among the figure: 1-sample, 2-tack dog screw, 3-specimen holder, 4-sleeve pipe chuck, 5-temperature probe, 6-aperture, the 7-rotation axis, 8-temperature measurer, 9-joint pin, 10-tip clamping screw, 11-pressure-air heating gun, 12-electrical heating elements, 13-rifle body, 14-thermopair, 15-resistance heated circle, the 16-rotary electric machine, 17-platform, 18-frequency modulator, the 19-air compressor, 20-carries tracheae, 21-spray gun, the 22-conveying pipeline, 23-sample rotating mechanism, 24-sample holder instrument, 25-measuring sample temperature system, 26-blow-off valve, 27-muff, 28-recirculated water cooler, 29-storage tank, 30-sense line.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment as illustrated in fig. 1 and 2, in the present embodiment, the test unit of described high temperature shot-peening comprises air compressor 19, pressure-air heating gun 11, spray gun 21, storage tank 29, sample rotating mechanism 23, sample holder instrument 24, measuring sample temperature system 25, air compressor 19 is connected with the pneumatics valve, again by carrying tracheae 20 to be connected to recirculated water cooler 28, recirculated water cooler 28 communicates with pressure-air heating gun 11 air intake openings upper end, the gas outlet of pressure-air heating gun 11 connects spray gun 21, spray gun 21 sidepieces are communicated with storage tank 29 by conveying pipeline 22, storage tank 29 is provided with blow-off valve 26 with the junction of conveying pipeline 22, spray gun 21 nozzle aligned beneath samples 1, sample 1 is by specimen holder 3 clampings, and specimen holder 3 is fixed on the rotation axis 7 by sleeve pipe chuck 4.Temperature measurement system 25 mainly is made of with temperature measurer 8 temperature probe 5, sense line 30, temperature probe 5 is fixed in the axle center of sleeve pipe chuck 4, one end of temperature probe 5 is deep in the middle of the axle class sample 1, and the temperature measurer 8 on the sense line 30 that is connected with the other end of temperature probe 5 passes aperture 6 and is fixed on rotation axis 7 is connected.
As shown in Figure 1, described air compression system, comprise air compressor 19, carry tracheae 20 and recirculated water cooler 28, annexation is: air compressor 19 is by carrying tracheae 20 to be connected on the recirculated water cooler 28, recirculated water cooler 28 links to each other with heat gun 11, carrying tracheae 20 is pressure pipes, and recirculated water cooler 28 prevents that pressure pipe from burning.
As shown in figs. 1 and 3, described pressure-air heating gun 11, comprise rifle body 13, electrical heating elements 12 and thermopair 14, wherein rifle body 13 is made by stainless steel, the outside uses thermal insulation material to be incubated, electrical heating elements 12 is arranged in the rifle body 11, and thermopair 14 places rifle body 11 front ends, is used for measuring the gas temperature of gas port.
As shown in Figure 1, described spray gun 21 is stainless steel material, and spray gun 21 outsides are provided with muff 27, prevents that temperature is lost.
As shown in Figure 1, described storage tank 29 is the cylindrical shape of opening, and material is stainless steel, be heated by resistive circle 15 heating on every side, in 500 degrees centigrade of scopes, can carry out temperature control, on the conveying pipeline 22 of storage tank 29 belows blow-off valve 26 is installed, can be according to shot peening strength size adjustment sediment outflow amount.
As shown in Figure 1, described sample rotating mechanism 24 comprises rotary electric machine 16, frequency modulator 18, platform 17, rotation axis 7, is fixed on the platform 17 after rotary electric machine 16 connects a frequency modulator 18, and links to each other with rotation axis 7, is used for driving sample and at the uniform velocity rotates.
As shown in Figure 2, described sample holder instrument 24, comprise specimen holder 3, sleeve pipe chuck 4, tack dog screw 2, tip clamping screw 10, its connected mode is, specimen holder 3 is fixed on the sleeve pipe chuck 4 by tack dog screw 2, and sleeve pipe chuck 4 is fixed on the rotation axis 7 by tip clamping screw 10.
As shown in Figure 2, described measuring sample temperature system 25, comprise alloy axle class sample 1 with holes, sleeve pipe chuck 4, temperature measurer 8 and temperature probe 5, wherein temperature probe 5 is positioned at sleeve pipe chuck 4 centers, one end of temperature probe 5 is deep in the middle of the axle class sample 1, the other end connects sense line 30, and sense line 30 links to each other with temperature measurer 8 by an aperture 6, can test at any time the temperature of axle class sample 1.
In a specific embodiment of the present invention, heat in advance storage tank 29, make blasting media reach temperature required, use again air compressor 19 with air pressurized after 1.5 MPas, through carrying tracheae 20 to enter pressure-air heating gun 11, the temperature of high temperature and high pressure gas can be heated to 1000 degrees centigrade, after becoming high temperature and high pressure gas, be injected on the alloy axle class sample 1 through spray gun 21, opening simultaneously frequency modulator 18 makes rotation axis 7 by certain rotational speed, treat that alloy axle class sample 1 rises to predetermined temperature, open the blow-off valve 26 under the storage tank 29, utilize the High Temperature High Pressure air ejector action that flow at high speed formation negative pressure produces in spray gun, the ejection blasting media strikes on the axle class alloy sample 1, guarantees thermally equivalent and even shot-peening.
More than specific embodiments of the invention are described.It will be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (10)
1. the test unit of a high temperature shot-peening, it is characterized in that, comprise air compression system, the pressure-air heating gun, spray gun, storage tank, the sample rotating mechanism, the sample holder instrument, the measuring sample temperature system, wherein, air compression system, the pressure-air heating gun, spray gun connects successively, spray gun places pressure-air heating gun below, the spray gun side links to each other with storage tank, spray tip aligned beneath sample holder instrument clamping sample, the sample holder instrument is fixed on the sample rotating mechanism, the measuring sample temperature system connects the sample holder instrument, and the measuring sample temperature system is used for the at any time temperature of test sample.
2. the testing equipment of high temperature shot-peening according to claim 1, it is characterized in that, described air compression system comprises air compressor, carries tracheae, recirculated water cooler, and air compressor is by carrying tracheae to be connected on the recirculated water cooler, and the recirculated water cooler links to each other with heat gun.
3. the testing equipment of high temperature shot-peening according to claim 1 is characterized in that, described pressure-air heating gun is used for the temperature of gases at high pressure is heated to about 1000 degrees centigrade, forms high temperature and high pressure gas.
4. the testing equipment of high temperature shot-peening according to claim 3, it is characterized in that, described pressure-air heating gun, comprise rifle body, electrical heating elements and thermopair, wherein the rifle body is made by stainless steel, the external face of rifle uses thermal insulation material to be incubated, and electrical heating elements is arranged in the rifle body, and the thermopair that is used for measuring the temperature of gas port places rifle body front end.
5. the testing equipment of high temperature shot-peening according to claim 1 is characterized in that, described spray gun is by making for stainless steel material, and the spray gun outside is provided be used to the muff that prevents that temperature is scattered and disappeared.
6. the testing equipment of high temperature shot-peening according to claim 1, it is characterized in that, described storage tank is the cylindrical shape of opening, material is stainless steel, be heated by resistive the circle heating on every side, can carry out temperature control in 500 degrees centigrade of scopes, storage tank connects spray gun by conveying pipeline, on the conveying pipeline of storage tank below blow-off valve is installed, blow-off valve is used for according to shot peening strength size adjustment sediment outflow amount.
7. the testing equipment of high temperature shot-peening according to claim 1, it is characterized in that, described sample rotating mechanism, comprise rotary electric machine, frequency modulator, platform, rotation axis, rotary electric machine is fixed on the platform after connecting frequency modulator, rotary electric machine links to each other with rotation axis, and rotary electric machine is used for driving sample and at the uniform velocity rotates.
8. the testing equipment of high temperature shot-peening according to claim 1, it is characterized in that, described sample holder instrument comprises tack dog screw, specimen holder, sleeve pipe chuck, the tack dog screw that is installed on the specimen holder is used for fixedly sample, specimen holder is fixed on the sleeve pipe chuck by the tack dog screw, and the sleeve pipe chuck is fixed on by point set screw on the post that is located by connecting of rotation axis of sample rotating mechanism.
9. the testing equipment of high temperature shot-peening according to claim 1, it is characterized in that, described measuring sample temperature system comprises temperature probe, sense line and temperature measurer, one end of temperature probe is deep in the middle of the sample holder instrument clamping sample, and the temperature probe other end connects temperature measurer by sense line.
10. the test method of a high temperature shot-peening, it is characterized in that, heat in advance storage tank, make blasting media reach temperature required, again with air compressor with air pressurized after 1.5 MPas, after carrying tracheae to enter the high temperature and high pressure gas that the pressure-air heating gun is heated to be 1000 degrees centigrade, the process lance ejection is on sample, utilize simultaneously frequency modulator Control Assay rotating mechanism to make sample by certain rotational speed, treat that sample rises to predetermined temperature, open the blow-off valve under the storage tank, utilize High Temperature High Pressure air flow at high speed in spray gun to form the ejector action that negative pressure produces, the ejection blasting media strikes on the sample, guarantees thermally equivalent and even shot-peening.
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Cited By (5)
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| CN104569304A (en) * | 2014-12-17 | 2015-04-29 | 浙江工业大学 | Shot blasting treatment mechanism study experimental device |
| CN104561863A (en) * | 2015-01-19 | 2015-04-29 | 上海交通大学 | Strain strengthening method for high-temperature surface of magnesium alloy |
| CN113199037A (en) * | 2021-05-10 | 2021-08-03 | 西安交通大学 | Method and device for manufacturing light alloy grains by using induction-assisted shot blasting to refine laser additive |
| CN113237743A (en) * | 2021-06-10 | 2021-08-10 | 浙江久立特材科技股份有限公司 | Test piece fixing device for pipeline surface shot blasting strength test |
| CN114107857A (en) * | 2021-11-30 | 2022-03-01 | 西北有色金属研究院 | High-temperature high-pressure shot peening strengthening method for improving ablation resistance of surface of refractory metal electrode |
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| CN113199037A (en) * | 2021-05-10 | 2021-08-03 | 西安交通大学 | Method and device for manufacturing light alloy grains by using induction-assisted shot blasting to refine laser additive |
| CN113237743A (en) * | 2021-06-10 | 2021-08-10 | 浙江久立特材科技股份有限公司 | Test piece fixing device for pipeline surface shot blasting strength test |
| CN113237743B (en) * | 2021-06-10 | 2023-10-27 | 浙江久立特材科技股份有限公司 | Test piece fixing device that pipeline surface shot peening intensity test used |
| CN114107857A (en) * | 2021-11-30 | 2022-03-01 | 西北有色金属研究院 | High-temperature high-pressure shot peening strengthening method for improving ablation resistance of surface of refractory metal electrode |
| CN114107857B (en) * | 2021-11-30 | 2022-04-26 | 西北有色金属研究院 | High-temperature high-pressure shot peening strengthening method for improving ablation resistance of surface of refractory metal electrode |
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