CN214866141U - Temperature compensating device for magnesium or magnesium alloy plate strip conveying roller way - Google Patents
Temperature compensating device for magnesium or magnesium alloy plate strip conveying roller way Download PDFInfo
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- CN214866141U CN214866141U CN202022278093.8U CN202022278093U CN214866141U CN 214866141 U CN214866141 U CN 214866141U CN 202022278093 U CN202022278093 U CN 202022278093U CN 214866141 U CN214866141 U CN 214866141U
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Abstract
The utility model provides a magnesium or magnesium alloy plate strip rollgang temperature supplementing device, aim at solve magnesium or magnesium alloy plate strip and because of the different upper and lower surface difference in temperature problem that causes of contact medium in transportation process upper and lower surface, finally improve the plastic working ability of magnesium alloy plate strip. The device comprises an electric heating conveying roller and is provided with a temperature control and feedback system such as a temperature testing device, a temperature analysis module and a temperature control module. The temperature of the conveying roller can be adjusted by adopting the device, so that the contact environment temperature of the upper surface and the lower surface of the magnesium or magnesium alloy plate strip in the conveying process is the same, the heat dissipation consistency of the upper surface and the lower surface of the magnesium or magnesium alloy plate strip in the conveying process is ensured, and the uniform temperature in the thickness direction is achieved. Thereby leading the magnesium or magnesium alloy plate strip to obtain better microstructure and mechanical property after rolling.
Description
Technical Field
The utility model relates to a magnesium or magnesium alloy plate strip processing technology field specifically is a magnesium or magnesium alloy plate strip rollgang temperature supplementing device.
Background
The magnesium alloy is used as the lightest metal structure material, has higher specific strength and specific rigidity, is the most potential lightweight material in the lightweight field, and is widely applied to a plurality of fields such as automobiles, electronics, national defense, aerospace and the like. At present, most magnesium alloy products are mainly die castings. However, due to the characteristics of the casting process, the cast magnesium alloy often shows the problems of coarse grains, serious structural defects, unsatisfactory comprehensive mechanical properties and the like, which greatly limits the large-scale application of magnesium alloy products in the market. Different from cast magnesium alloy, the structure of the deformed magnesium alloy can be reasonably regulated and controlled through plastic processing and heat treatment, so that the deformed magnesium alloy has good mechanical properties. However, the close-packed hexagonal crystal structure of the magnesium alloy ensures that only basal plane slippage is easy to start at room temperature, and the plastic processing capability is poor, so that the application of the wrought magnesium alloy is not developed in a large scale.
The rising of the deformation temperature has a remarkable positive effect on the starting of the non-basal-plane slippage of the magnesium alloy, so that the magnesium alloy can coordinate the external deformation by depending on various slippage systems like the aluminum alloy, the plastic processing capability is greatly improved, and the method is one of the most effective means for improving the plastic processing capability of the magnesium alloy at present. However, the characteristics of low specific heat capacity and quick heat dissipation of the magnesium alloy lead the temperature to be greatly and quickly reduced in the plastic deformation process, the deformation temperature is difficult to control, and the shape stability of a plastic processing product is poor, so the temperature control in the plastic deformation process of the magnesium alloy is very important. More importantly, the temperature range suitable for magnesium alloy deformation is narrow, the microstructure and the mechanical property of the magnesium alloy can be influenced by small temperature change, and even the temperature difference in the same magnesium alloy deformation material can cause the instability of the shape and the mechanical property of the magnesium alloy deformation material. The instability of the shape and the mechanical property greatly limits the large-scale application of the deformed magnesium alloy plate strip in the market.
Therefore, how to control the temperature of the magnesium or magnesium alloy sheet strip in the plastic working is a hot spot of research in the field. At present, related patents have been reported in the field for temperature control methods and devices in the process of preparing wrought magnesium alloys, but all focus on adjusting the system temperature and controlling the rolling temperature of magnesium alloy plates and strips. For example, chinese patent ZL201410407171.6, "a temperature control system for warm rolling of magnesium and magnesium alloy plates and strips", realizes temperature control and heat preservation by preheating and heating magnesium and magnesium alloy plates and strips before rolling, online temperature control of rollers, online temperature compensation of coils, environmental heat preservation and heat insulation, and preheating of a whole set of temperature control equipment, but this technology only increases the environmental temperature of the whole system, and the heat-insulation protective cover involved in this technology leads to increased maintenance cost and inconvenient maintenance, and the design of the auxiliary tool adopted is complicated, the cost is higher, the occupied space is large, and the problems such as interference with rolling mill equipment are easily caused. The method for online temperature compensation, constant temperature rolling and coiling of the deformed magnesium alloy plate strip in the Chinese patent ZL201510640182.3 is used for heat preservation in the rolling process of the magnesium or magnesium strip by arranging a plurality of stages in the rolling process, and comprises preheating by a chain type ingot casting heating furnace, preheating by a natural gas or electromagnetic induction heating preheating roller and preheating by a roller bottom heating furnace. Although the technology can heat and supplement heat on line, continuously, safely and effectively, and improve the production efficiency and the product quality, the heat preservation measures related to the technology are difficult to control the temperature accurately, the deformation temperature fluctuation is large, the equipped tools are various, the cost is high, the occupied space is large, the interference with host equipment is easy, and the like.
Compared with the prior art, the improvement measures are obviously different from the prior art by focusing on how to adjust the system temperature, control the rolling temperature of the magnesium alloy plate strip and the like, the inventor finds that the heat loss of the magnesium alloy on a conveying roller way is the most serious and the temperature of the magnesium alloy is the most difficult to control in the preparation process of the deformed magnesium alloy in the long-term experiment process, particularly the upper surface and the lower surface of the magnesium alloy plate strip have different heat dissipation capacities due to different contact media in the conveying process, and finally the temperature difference between the upper surface and the lower surface is larger. The temperature difference causes different plastic deformation behaviors to be generated when the upper surface and the lower surface of the plate enter a deformation zone, different plastic flows are shown, residual stress is easily formed inside the deformed plate, the deformed plate strip is seriously warped, and simultaneously the microscopic structures on the upper surface and the lower surface form a gradient microscopic structure due to the temperature difference, so that the mechanical property of the plate is unstable. Therefore, the key point for improving the plastic processing capacity of the magnesium alloy strip is to solve the problem of temperature difference between the upper surface and the lower surface of the magnesium alloy strip caused by different contact media.
However, no relevant research report aiming at solving the temperature equalization problem in the conveying process of the magnesium alloy plate strip, particularly the temperature difference between the upper surface and the lower surface of the plate strip caused by the contact of different media, exists in the field. The above patents and other published patents and papers do not relate to the solution of the temperature equalization problem during the transportation of magnesium alloy sheet and strip, especially the problem of large temperature difference between the upper and lower surfaces of the sheet and strip due to the contact with different media.
SUMMERY OF THE UTILITY MODEL
The purpose of the present invention is to find a simple and effective method for solving the above mentioned technical problems in the prior art. Namely, the problem of temperature difference between the upper surface and the lower surface of the magnesium or magnesium alloy plate strip caused by different contact media in the conveying process is solved, and the plastic processing capacity of the magnesium or magnesium alloy plate strip is finally improved.
Therefore, the inventor obtains the temperature compensating device for the conveying roller way of the magnesium or magnesium alloy plate strip through research and experiments. The device adopts the electric heating conveying roller, is provided with temperature control and feedback systems such as a temperature testing device, a temperature analysis module, a temperature control module and the like, and adjusts the temperature of the conveying roller, so that the contact environment temperature of the upper surface and the lower surface of the magnesium or magnesium alloy plate strip in the conveying process is the same, and the problem of large temperature difference between the upper surface and the lower surface of the magnesium or magnesium alloy plate strip in a conveying roller way due to different contact media of the upper surface and the lower surface is solved. Adopt the utility model discloses the device is with magnesium or magnesium alloy plate strip upper and lower surface difference in temperature control within 5 ℃ in rollgang transportation process.
The device comprises a conveying roller electric heating system and an intelligent control system; the conveying roller electric heating system comprises a conveying roller 2 arranged on the conveying roller way frame 1 and an electric heating element 5 positioned in the conveying roller; the conveying roller 2 is a hollow roller, and a rotating shaft 4 with a hole is arranged in the roller; the electric heating element 5 is nested in the rotating shaft 4 with the hole, and the electric heating element and the rotating shaft are connected with the conveying roller 2 through the bearing 3 to form an electric heating conveying roller (figure 3); the electric heating conveying rollers are arranged on the conveying roller way frame 1 side by side.
The intelligent control system comprises a temperature testing device and a control terminal; the temperature testing device comprises a plurality of infrared sensors 6 which are respectively arranged above and below the conveying roller way frame 1; the infrared sensor 6 is positioned 200-400 mm above and below the conveying roller, and the infrared sensor 6 is connected with the control terminal 10; the control terminal 10 comprises an LED display screen 7, a built-in temperature analysis module 8 and a temperature control module 9. The control terminal 10 controls the switching of the conveyor roller heating system. Forming a closed loop feedback system of temperature test, temperature analysis and temperature control.
When the temperature compensation device for the magnesium or magnesium alloy plate strip conveying roller way works, when a magnesium or magnesium alloy plate strip 11 to be processed is conveyed by the conveying rollers, the plurality of infrared sensors 6 above and below the conveying rollers 2 respectively and continuously test the temperatures of the upper surface and the lower surface of the plate strip to be processed, data are input into the control terminal 10, the temperature analysis module 8 of the control terminal 10 calculates the temperature difference value of the upper surface and the lower surface, compares the temperature difference value with the preset tolerance temperature, and outputs a control instruction to the temperature control module 9; the temperature control module 9 receives a control instruction, turns on/off a power supply, and controls the working state of the electric heating system of the conveying roller, namely, the temperature of the conveying roller is adjusted, and finally the temperature of the upper surface and the lower surface of the magnesium alloy plate strip in the conveying process is controlled. The operator can observe and judge in real time through the LED display screen 7 to make correction and proofreading.
The utility model has important meaning because before this, the influence of the change of the upper surface and the lower surface temperature of the magnesium or magnesium alloy plate strip in the conveying process on the plastic deformation behavior of the plate strip in the rolling process is hardly concerned by the technical personnel in the field. However, the inventor of the invention finds that if the temperature of the magnesium or magnesium alloy plate strip is regulated and controlled only in the rolling process, the improvement of the microstructure and the mechanical property of the end product cannot achieve satisfactory results. However, if the temperature of the upper surface and the lower surface of the magnesium or magnesium alloy plate strip is controlled from the conveying process, especially from a long distance, better microstructure and better mechanical property can be obtained after the magnesium or magnesium alloy plate strip enters the roller for rolling. The principle is that in the process of conveying magnesium or magnesium alloy plates and strips, the upper surfaces and the lower surfaces of the plates and strips are always contacted with different media in a conveying roller way, for example, the upper surfaces are air, and the lower surfaces are steel conveying rollers. This easily causes different temperature drop ranges of the upper surface and the lower surface of the magnesium or magnesium alloy plate strip, so that the plate strip has different plastic deformation behaviors on the upper surface and the lower surface due to different temperatures of the upper surface and the lower surface when entering the deformation zone, and the residual stress is easily formed in the plate, which is not favorable for obtaining the magnesium or magnesium alloy plate strip with excellent formability.
The temperature of media contacted with the upper surface and the lower surface of the plate strip can be adjusted by simply modifying the existing common conveying roller in the field and adding an electric heating device and a temperature control system, so that the heat dissipation of the upper surface and the lower surface of the magnesium or magnesium alloy plate strip is consistent in the conveying process, and the aim of uniform temperature in the thickness direction is fulfilled. Excellent microstructure and mechanical properties are obtained after rolling. Thereby greatly expanding the large-scale application of the magnesium or magnesium alloy plate strip in the market and having great application and popularization prospects.
In a word, the utility model discloses following beneficial effect has:
(1) novel originality, design benefit. The invention starts from a magnesium or magnesium alloy plate strip conveying roller way originally, and controls the temperature of the upper surface and the temperature of the lower surface of a magnesium or magnesium alloy plate strip in the conveying process by arranging a temperature compensating device on the conveying roller way, so that the heat dissipation of the upper surface and the lower surface of the magnesium or magnesium alloy plate strip in the conveying process is consistent, and the aim of uniform temperature in the thickness direction is fulfilled. Finally, the performance of the rolled plate is improved. The unexpected good effect is achieved.
(2) The device is simple, easy to operate and control. Through add simple control by temperature change frock on current conventional rollgang, need not carry out extensive transformation to current equipment, and the device occupation space is little, does not have the interference with host computer equipment, and the operation is maintained easily, and the cost is extremely low.
(3) The operation is automatic and intelligent. The utility model discloses magnesium or magnesium alloy slab band conveying roller temperature compensating device has designed temperature control and feedback system, has closed loop feedback characteristics, can do the self-adaptation according to external environment and judge to the temperature difference control of surface in different external environment is in less within range about guaranteeing the plate strip.
(4) High practicability and wide application. The utility model is suitable for an all rollgang temperature compensations in the field are particularly useful for solving the too big problem of surface difference in temperature about the slab band that leads to because of the heat dissipation difference among the long distance transportation process. The magnesium alloy sheet and strip material can be used for magnesium or magnesium alloy sheet and strip materials, various metal materials such as aluminum, titanium and the like, and various plastic deformation processes such as rolling, extrusion, forging and the like, and has strong transportability.
Drawings
Fig. 1 is a working flow chart of the temperature compensating device for the magnesium or magnesium alloy plate and strip conveying roller way of the utility model.
Fig. 2 is a schematic view of the temperature compensating device for the magnesium or magnesium alloy plate and strip conveying roller way of the present invention.
Fig. 3 is a schematic view of the conveying roller structure of the temperature compensating device for the magnesium or magnesium alloy plate and strip conveying roller bed of the utility model.
In fig. 2 and 3: the device comprises a conveying roller way frame, 2 conveying rollers, 3 bearings, 4 rotating shafts with holes, 5 heating elements, 6 infrared sensors, 7 LED display screens, 8 temperature analysis modules, 9 temperature control modules, 10 control terminals and 11 magnesium plate strips.
Fig. 4 to fig. 6 are a temperature change contrast chart, a microstructure change contrast chart after deformation, and a mechanical property change contrast chart of the upper and lower surfaces of the AZ31 magnesium alloy plate when the first conveying roller way temperature compensation device of the present invention is opened and closed, respectively.
Fig. 7 to 9 are a temperature change contrast chart, a microstructure change contrast chart after deformation, and a mechanical property change contrast chart of the upper and lower surfaces of the ZK60 magnesium alloy plate when the conveying roller way temperature compensation device of the second invention is opened and closed.
Fig. 10 to 12 are a temperature change contrast chart, a microstructure change contrast chart after deformation, and a mechanical property change contrast chart of the upper and lower surfaces of the Mg-Nd-Zn-Zr magnesium alloy plate respectively when the conveying roller way temperature compensation device of the third embodiment of the present invention is opened and closed.
Detailed Description
The present invention will be further described with reference to the following specific embodiments. It should be noted that the following examples and experimental examples include temperature compensation devices or temperature compensation tools related to the drawings, which are all temperature compensation devices for magnesium or magnesium alloy plate and strip conveying roller ways.
As shown in fig. 2 and 3, the device comprises a conveying roller electric heating system and an intelligent control system; the conveying roller electric heating system comprises a conveying roller 2 arranged on the conveying roller way frame 1 and an electric heating element 5 positioned in the conveying roller; the conveying roller 2 is a hollow roller, and a rotating shaft 4 with a hole is arranged in the roller; the electric heating element 5 is nested in the rotating shaft 4 with the hole, and the electric heating element and the rotating shaft are connected with the conveying roller 2 through the bearing 3 to form an electric heating conveying roller (figure 3); the electric heating conveying rollers are arranged on the conveying roller way frame 1 side by side.
The intelligent control system comprises a temperature testing device, a temperature analysis module and a temperature control module; the temperature testing device comprises a plurality of infrared sensors 6 which are respectively arranged at 200-400 mm positions above and below the conveying roller way frame 1; the infrared sensor 6 is connected with the control terminal 10; the control terminal 10 comprises an LED display screen 7, a built-in temperature analysis module 8 and a temperature control module 9. The control terminal 10 controls the switching of the conveyor roller heating system. Forming a closed loop feedback system of temperature test, temperature analysis and temperature control.
When the temperature compensating device for the magnesium or magnesium alloy plate strip conveying roller way works, when a magnesium or magnesium alloy plate strip 11 to be processed is conveyed by the conveying rollers, the plurality of infrared sensors 6 above and below the conveying rollers 2 respectively and continuously test the temperature of the upper surface and the temperature of the lower surface of the plate strip to be processed, data are input into the control terminal 10, the temperature analysis module 8 calculates the temperature difference value of the upper surface and the lower surface, the temperature difference value is compared with the preset tolerance temperature, and a control instruction is output to the temperature control module 9; the temperature control module 9 receives a control instruction, turns on/off a power supply, and controls the working state of the electric heating system of the conveying roller, namely, the temperature of the conveying roller is adjusted, and finally the temperature of the upper surface and the lower surface of the magnesium alloy plate strip in the conveying process is controlled. The operator can observe and judge in real time through the LED display screen 7 to make correction and proofreading.
The working process of the temperature compensating device for the magnesium or magnesium alloy plate strip conveying roller way is shown in figure 1, and the specific process comprises the following steps:
(1) placing a magnesium or magnesium alloy plate strip to be processed on a conveying roller way; starting the conveying roller way and starting the temperature compensating device;
(2) the temperature control system tests the initial temperature of the upper surface and the lower surface of the magnesium or magnesium alloy plate strip to be processed in real time, and continuously tests the temperature of the upper surface and the lower surface of the plate in the conveying process;
(3) calculating the temperature difference between the upper surface and the lower surface of the plate and strip material by a temperature analysis module in the temperature control system, comparing the temperature difference with a preset tolerance temperature, and outputting a control instruction; the temperature control module controls the working state of the electric heating system of the conveying roller; if the temperature exceeds the set tolerance temperature, starting the heating element to work; if the temperature is less than or equal to the set tolerance temperature, the power supply is cut off, and the heating element stops working.
Comparative experiment example I,
Use AZ31 board as an example, contrast research use the utility model discloses the device treats processing panel and carries out online benefit warm usefulness and does not use the utility model discloses the device carries out online benefit warm, respectively to the influence of panel transportation in-process upper surface and lower surface temperature change and to carrying out microscopic structure observation and mechanical properties test to the AZ31 board after warping.
1) starting the conveying roller way and opening the temperature compensating device;
2) placing a 30mm thick AZ31 plate in a roller conveyor for conveying, and measuring the temperature of an initial AZ31 plate to be 300 ℃;
3) respectively testing the temperatures of the upper surface and the lower surface of the AZ31 plate when the plate just enters the conveying roller way by using the infrared sensors;
4) continuously testing the temperature of the upper surface and the lower surface of the AZ31 board by using an infrared sensor during the conveying process;
5) the AZ31 sheet was fed into the mill to produce a thickness reduction deformation.
The temperature profile of the upper and lower surfaces of AZ31 panels during test 1 is shown in fig. 4 a.
1) starting the conveying roller way without starting the temperature compensating device;
2) placing and conveying a 30mm thick AZ31 plate in a roller conveyor, wherein the temperature of an initial AZ31 plate is 300 ℃;
3) respectively testing the temperatures of the upper surface and the lower surface of the AZ31 plate when the plate just enters the conveying roller way by using the infrared sensors;
4) continuously testing the temperature of the upper surface and the lower surface of the AZ31 board by using an infrared sensor during the conveying process;
5) the AZ31 sheet was fed into the mill to produce a thickness reduction deformation.
The temperature profiles of the upper and lower surfaces of the AZ31 boards during the above comparative test 1 are shown in fig. 4 b.
As can be seen from the comparative analysis of fig. 4a and 4b, when the temperature compensation tool on the roller conveyor is opened, the temperature difference between the upper surface and the lower surface of the AZ31 plate is small and within 3 ℃, and when the temperature compensation tool on the roller conveyor is closed, the temperature difference between the upper surface and the lower surface of the AZ31 plate is large and can reach 13 ℃ at most. The deformed AZ31 plate was then subjected to microstructure observation and mechanical property test as shown in fig. 5 and 6, respectively. As can be seen from the figure 5, when the temperature compensation tool is opened, the microscopic structures of the upper surface and the lower surface after plastic deformation are mainly fine isometric recrystallization structures, and the structure difference is small; when the temperature compensation tool is closed, the difference of microstructures of the upper surface and the lower surface after plastic deformation is large, wherein the upper surface is dynamically recrystallized to show a dynamic recrystallization structure of equiaxed grains, and the lower surface is not obviously dynamically recrystallized due to low temperature but generates a large amount of twin structures due to deformation coordination. Due to the difference of microstructures of the upper surface and the lower surface after plastic deformation, the mechanical properties of the upper surface and the lower surface also show larger difference: when the temperature compensation tool in the test 1 is opened, the mechanical properties of the upper surface and the lower surface are not greatly different, the yield strength is only different by 3.7MPa, and the elongation is only different by 1.6%; when the temperature compensation tool in the comparative test 1 is closed, the difference of the mechanical properties of the upper surface and the lower surface is large, the yield strength difference is 39.4MPa, and the elongation difference is 6.3 percent (figure 6). The analysis shows that when the temperature compensation tool is closed, the large temperature difference generated by the AZ31 plate in the conveying process can generate large difference of microstructures and mechanical properties on the upper surface and the lower surface of the AZ31 plate after plastic deformation, and the temperature difference between the upper surface and the lower surface of the plate strip in the conveying process is effectively reduced by the temperature compensation tool, so that the difference between the microstructures and the mechanical properties of the plate strip after deformation is small.
Comparative experiment example two,
Use ZK60 panel as an example, contrast research uses the utility model discloses the device treats processing panel and carries out online benefit warm with not using the utility model discloses the device carries out online benefit warm, respectively to the influence of panel transportation process upper surface and lower surface temperature change and carry out microscopic structure observation and mechanical properties test to the ZK60 panel after the deformation.
1) starting the conveying roller way and opening the temperature compensating device;
2) placing a ZK60 plate with the thickness of 10mm in a roller conveyor for conveying, wherein the temperature of the initial ZK60 plate is 350 ℃;
3) the infrared sensors respectively test the temperatures of the upper surface and the lower surface of the ZK60 plate when the plate just enters the conveying roller way;
4) continuously testing the temperatures of the upper surface and the lower surface of the ZK60 plate by using an infrared sensor in the conveying process;
5) entering a rolling mill to generate thickness reduction deformation. The temperature profile of the upper and lower surfaces of the ZK60 sheet during the above process is shown in fig. 7 a.
1) opening the conveying roller way and closing the temperature compensating device;
2) placing a ZK60 plate with the thickness of 10mm in a roller conveyor for conveying, wherein the temperature of the initial ZK60 plate is 350 ℃;
3) the infrared sensors respectively test the temperatures of the upper surface and the lower surface of the ZK60 plate when the plate just enters the conveying roller way;
4) continuously testing the temperatures of the upper surface and the lower surface of the ZK60 plate by using an infrared sensor in the conveying process;
5) entering a rolling mill to generate thickness reduction deformation. The temperature profile of the upper and lower surfaces of the ZK60 sheet during the above process is shown in fig. 7 b.
As can be seen from fig. 7, when the temperature compensation tool on the roller conveyor is opened, the temperature difference between the upper surface and the lower surface of the ZK60 plate strip is small and is within 3 ℃ (fig. 7a), and when the temperature compensation tool on the roller conveyor is closed, the temperature difference between the upper surface and the lower surface of the ZK60 plate strip can reach 12 ℃ (fig. 7 b). Due to the temperature difference between the upper and lower surfaces during the transportation process, the microstructure and mechanical properties of the upper and lower surfaces after plastic deformation show a large difference, as shown in fig. 8 and 9, respectively. As can be seen from fig. 8 and 9, when the temperature compensation tool in test 2 is opened, the microstructure of the upper and lower surfaces after plastic deformation is mainly a fine equiaxial dynamic recrystallization structure, and the structure difference and the mechanical property difference are small (fig. 8); in contrast experiment 2, when the temperature compensation tool is closed, the upper surface is dynamically recrystallized and has a dynamic recrystallization structure, while the lower surface is not obviously dynamically recrystallized due to lower temperature, so that an elongated grain morphology structure is shown, the mechanical property difference is large, and the yield strength difference is 15MPa (fig. 9). The temperature changes generated on the upper surface and the lower surface in the conveying process generate shape differences on the plastically deformed ZK60 plate strips, wherein when the temperature compensation tool in the test 2 is opened, the ZK60 plate strip is straight and does not have warpage, while the ZK60 plate strip without the effect of the temperature compensation tool in the comparison test 2 has severe warpage and has poor plate strip shape. Therefore, the temperature compensation tool on the conveying roller way not only has a great improvement effect on the microstructure and the mechanical property of the deformed plate, but also has a great improvement effect on the shape of the deformed plate.
Comparative experiment example III,
Taking Mg-Nd-Zn-Zr series plates as an example, the comparison research uses the device to perform online temperature compensation on the plates to be processed and does not use the device to perform online temperature compensation, and the device respectively performs microstructure observation and mechanical property test on the temperature change of the upper surface and the lower surface in the plate conveying process and the deformed Mg-Nd-Zn-Zr series plates.
Experiment 3, launch the utility model discloses magnesium or magnesium alloy plate strip rollgang temperature compensating device:
1) starting the conveying roller way and opening the temperature compensating device;
2) placing Mg-Nd-Zn-Zr series plates with the thickness of 30mm in a conveying roller way for conveying, wherein the temperature of the initial Mg-Nd-Zn-Zr series plates is 450 ℃;
3) respectively testing the temperatures of the upper surface and the lower surface of the Mg-Nd-Zn-Zr plate when the Mg-Nd-Zn-Zr plate just enters the conveying roller way by using an infrared sensor;
4) continuously testing the temperatures of the upper surface and the lower surface of the Mg-Nd-Zn-Zr plate by using an infrared sensor in the conveying process;
5) entering a rolling mill to generate thickness reduction deformation. The temperature change curves of the upper and lower surfaces of the Mg-Nd-Zn-Zr based sheet in the above process are shown in FIG. 10 a.
Contrast test 3, do not launch the utility model discloses magnesium or magnesium alloy slab band rollgang temperature compensating device adopts conventional method promptly:
1) opening the conveying roller way and closing the temperature compensating device;
2) placing Mg-Nd-Zn-Zr series plates with the thickness of 30mm in a conveying roller way for conveying, wherein the temperature of the initial Mg-Nd-Zn-Zr series plates is 450 ℃;
3) respectively testing the temperatures of the upper surface and the lower surface of the Mg-Nd-Zn-Zr plate when the Mg-Nd-Zn-Zr plate just enters the conveying roller way by using an infrared sensor;
4) continuously testing the temperatures of the upper surface and the lower surface of the Mg-Nd-Zn-Zr plate by using an infrared sensor in the conveying process;
5) entering a rolling mill to generate thickness reduction deformation. The temperature change curves of the upper and lower surfaces of the Mg-Nd-Zn-Zr based sheet in the above process are shown in FIG. 10 b.
As can be seen from FIG. 10, the results are similar to the above, and when the temperature compensation fixture on the rollgang is opened, the temperature difference between the upper and lower surfaces of the Mg-Nd-Zn-Zr system sheet is small and within 5 ℃ (FIG. 10a), and when the temperature compensation fixture on the rollgang is closed, the temperature difference between the upper and lower surfaces thereof can reach 15 ℃ (FIG. 10 b). This temperature difference also has different effects on the microstructure and mechanical properties of the upper and lower surfaces after plastic deformation (fig. 11 and 12). But differs from comparative test example 1 and comparative test example 2: due to the existence of rare earth elements of the Mg-Nd-Zn-Zr series plate, complete dynamic recrystallization occurs on the upper surface and the lower surface of the plastically deformed plate, equiaxial dynamic recrystallization textures are formed, but the difference of the temperature of the upper surface and the lower surface brings about the difference of grain sizes. Specifically, in test 3, when the temperature compensation tool is opened, the difference between the sizes of the grains on the upper surface and the lower surface of the plate is small; when contrast test 3 closed the frock of mending temperature, the lower surface of panel dispels the heat very fast in transportation process, and the temperature drop is great, and the crystalline grain is difficult for growing up, and the crystalline grain size is comparatively tiny, and the upper surface is because the temperature is higher, is changeed and grows up, and the crystalline grain size is thick slightly (fig. 12). Therefore, the temperature compensation tool has a more obvious influence on the grain size of the microstructure of the plastically deformed plate. The change of mechanical properties is also brought by the grain size difference, wherein the lower surface of the plate without the effect of the temperature compensation tool in the comparative test 3 shows higher yield strength (186.9MPa) and is obviously higher than the upper surface (169.1MPa) due to smaller grain size; the difference of the mechanical properties of the upper surface and the lower surface of the plate with the effect of the temperature compensation tool in the test 3 is small due to the small difference of the sizes of the crystal grains (figure 12). As in comparative example 2, the temperature difference between the upper and lower surfaces of the sheet during the conveying process also had a large influence on the sheet after the flow deformation. Experiment 3 when the temperature compensation tool was opened, the Mg-Nd-Zn-Zr based panel was straight and without warpage, while the Mg-Nd-Zn-Zr based panel without the effect of the temperature compensation tool suffered severe warpage.
It can be seen by above-mentioned contrast experiment example, when opening the utility model discloses when the device carries out online temperature compensation, magnesium alloy plate strip upper surface and lower surface temperature difference are less, all within the range of 5 ℃, and do not use the utility model discloses when the device carries out online temperature compensation, magnesium alloy plate strip upper surface and lower surface temperature difference can reach 15 ℃. Meanwhile, magnesium or magnesium alloy has the characteristic of narrow plastic deformation temperature window, so that obviously different plastic deformation behaviors can be generated under the influence of smaller temperature difference, and the shape and the performance of the magnesium plate strip are seriously influenced. Therefore, in order to prepare the magnesium or magnesium alloy plate strip with excellent formability, the temperature compensation device is added in the conveying roller way, so that the problem of large temperature difference between the upper surface and the lower surface of the magnesium or magnesium alloy plate strip caused by different contact media of the upper surface and the lower surface of the magnesium or magnesium alloy plate strip in the conveying process is solved, and the method is very necessary.
Claims (3)
1. A magnesium or magnesium alloy plate strip rollgang temperature supplementing device is characterized in that: the device comprises a conveying roller electric heating system and an intelligent control system; the conveying roller electric heating system comprises conveying rollers (2) arranged on a conveying roller way frame (1) and electric heating elements (5) positioned in the conveying rollers; the conveying roller (2) is a hollow roller, and a rotating shaft (4) with a hole is arranged in the roller; the electric heating element (5) is nested in the rotating shaft (4) with the hole, and the electric heating element and the rotating shaft are connected with the conveying roller (2) through the bearing (3) to form an electric heating conveying roller; the electric heating conveying rollers are arranged on the conveying roller way frame (1) side by side;
the intelligent control system comprises a temperature testing device and a control terminal; a temperature analysis module and a temperature control module are arranged in the control terminal; the temperature testing device comprises a plurality of infrared sensors (6) which are respectively arranged above and below the conveying roller way frame (1); the infrared sensor (6) is connected with the control terminal (10); the control terminal (10) comprises an LED display screen (7), a built-in temperature analysis module (8) and a temperature control module (9).
2. The magnesium or magnesium alloy plate strip conveying roller way temperature supplementing device according to claim 1, wherein the control terminal (10) controls the switch of the electric heating system of the conveying roller.
3. The temperature compensation device for the magnesium or magnesium alloy plate strip conveying roller way as claimed in claim 1, wherein the infrared sensor (6) is positioned 200-400 mm above and below the conveying roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022278093.8U CN214866141U (en) | 2020-10-14 | 2020-10-14 | Temperature compensating device for magnesium or magnesium alloy plate strip conveying roller way |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022278093.8U CN214866141U (en) | 2020-10-14 | 2020-10-14 | Temperature compensating device for magnesium or magnesium alloy plate strip conveying roller way |
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