阅读说明：本技术 一种便于精准研究电磁感应加热阶段的温度测试装置 (Temperature testing device convenient for accurately researching electromagnetic induction heating stage ) 是由 陈国华 高振山 黄雪杰 于 2019-05-07 设计创作，主要内容包括：发明公开的属于加热阶段装置技术领域,具体为一种便于精准研究电磁感应加热阶段的温度测试装置,其特征在于：包括下支撑板、电机支座、联轴器、阶梯轴、轴承座、螺杆、感应线圈、红外测温仪和中央控制模块,所述下支撑板的四角贯穿连接有第一螺栓,所述第一螺栓的顶端固定安装有上支撑板,所述上支撑板的顶部左侧固定安装所述电机支座,所述电机支座的左侧壁固定安装所述步进电机,所述步进电机的动力输出端固定连接有转轴,所述转轴的右侧端固定安装所述联轴器,所述联轴器的内腔右侧端固定安装所述阶梯轴,该发明实现了对工件温度实时监控,控制曲轴样件的转速和加热时间,从而提高产品的合格率的综合效果。(The invention discloses a temperature testing device convenient for accurately researching an electromagnetic induction heating stage, belonging to the technical field of devices in the heating stage, and being characterized in that: the crankshaft sample piece temperature monitoring device comprises a lower supporting plate, a motor support, a coupler, a stepped shaft, a bearing seat, a screw rod, an induction coil, an infrared thermometer and a central control module, wherein first bolts are connected to four corners of the lower supporting plate in a penetrating mode, an upper supporting plate is fixedly installed at the top ends of the first bolts, the motor support is fixedly installed on the left side of the top of the upper supporting plate, the stepping motor is fixedly installed on the left side wall of the motor support, a rotating shaft is fixedly connected to the power output end of the stepping motor, the coupler is fixedly installed at the right side end of the rotating shaft, and the stepped shaft is fixedly installed at the right side end of the inner cavity of the coupler.)

1. The utility model provides a temperature test device convenient to accurate research electromagnetic induction heating stage which characterized in that: the device comprises a lower supporting plate (100), a motor support (200), a coupler (300), a stepped shaft (400), a bearing seat (500), a screw rod (600), an induction coil (700), an infrared thermometer (800) and a central control module (900), wherein four corners of the lower supporting plate (100) are connected with first bolts (110) in a penetrating manner, an upper supporting plate (120) is fixedly installed at the top end of each first bolt (110), the motor support (200) is fixedly installed on the left side of the top of the upper supporting plate (120), the stepping motor (210) is fixedly installed on the left side wall of the motor support (200), a rotating shaft (220) is fixedly connected with the power output end of the stepping motor (210), the coupler (300) is fixedly installed at the right side end of the rotating shaft (220), the stepped shaft (400) is fixedly installed at the right side of the inner cavity of the coupler (300), and the bearing seat (500) is fixedly installed at the right, the inner wall of the bearing seat (500) is clamped with a bearing (510), the stepped shaft (400) is fixedly mounted on the inner wall of the bearing (510), the right side end of the stepped shaft (400) is inserted into the screw rod (600), the screw rod (600) is screwed with the second nut (610), the right side end of the screw rod (600) is fixedly mounted with the sample piece (620), the outer wall of the sample piece (620) is jointed with the induction coil (700), the outer wall of the induction coil (700) is fixedly mounted with a magnetizer (730), the middle part of the induction coil (700) is fixedly mounted with a crankshaft journal (720), the induction coil (700) is electrically connected with the electromagnetic induction heating device (710) through a lead, the infrared thermometer (800) is placed at the right side end of the sample piece (620), and the infrared thermometer (800) is electrically output connected with the central control module (900), the central control module (900) is electrically connected with the storage module (910) in a bidirectional way, and the central control module (900) is electrically connected with the stepping motor (210) and the electromagnetic induction heating device (710) in an output way.

2. The temperature testing device of claim 1, wherein the temperature testing device is configured to facilitate accurate study of the electromagnetic induction heating phase, and further comprises: and a tripod (810) is fixedly installed at the bottom of the infrared thermometer (800).

3. The temperature testing device of claim 1, wherein the temperature testing device is configured to facilitate accurate study of the electromagnetic induction heating phase, and further comprises: the right side end of the stepped shaft (400) is provided with a screw hole, and the inner wall of the screw hole is in threaded connection with the screw rod (600).

4. The temperature testing device of claim 1, wherein the temperature testing device is configured to facilitate accurate study of the electromagnetic induction heating phase, and further comprises: circular draw-in groove has been seted up to the left side wall of bearing frame (500), circular draw-in groove inner wall joint bearing (510), the through-hole has been seted up at circular draw-in groove's middle part, the through-hole with step shaft (400) cooperate and connect.

5. The temperature testing device of claim 1, wherein the temperature testing device is configured to facilitate accurate study of the electromagnetic induction heating phase, and further comprises: and a rubber pad is fixedly arranged at the bottom of the lower supporting plate (100).

Technical Field

The invention relates to the technical field of devices in a heating stage, in particular to a temperature testing device convenient for accurately researching an electromagnetic induction heating stage.

Background

The induction heating stage is to heat the workpiece by generating eddy current in the workpiece by electromagnetic induction. The electromagnetic induction heating stage process is expected to be an efficient, clean and non-contact heating mode, and is widely applied to the modern industrial field. Although the ultimate goal of the induction heating stage process is to improve the mechanical properties of the material, such as surface strength, hardness, and fatigue properties of the material, it is first and foremost important to be able to precisely control the temperature profile of the heated region of the workpiece. In the heating process, the temperature distribution of the workpiece and the highest temperature which can be reached directly influence the material characteristics of the thickness, the surface hardness, the residual stress distribution and the like of the quenched layer after cooling. The phenomenon of overheating or overburning can occur due to improper temperature control, so that the surface structure components of the workpiece can not meet the standard requirements, and the mechanical properties such as plasticity, fracture toughness and the like are obviously reduced. During the finish machining and normal use of the workpiece, a stress concentration phenomenon may occur due to the occurrence of micro cracks, which may lead to rapid crack propagation and fracture. Reasonable temperature field distribution of the workpiece is the key to obtaining qualified products. Therefore, it is crucial to achieve precise control of the heating temperature profile of the workpiece during the electromagnetic induction heating phase.

In the electromagnetic induction heating process, the decisive role of the temperature field is the setting of process parameters, including crankshaft rotation speed, heating time, design parameters of induction coils, input current, voltage and the like. Therefore, the factors influencing the temperature field distribution are more, the process parameters for obtaining more reasonable temperature field distribution by the traditional test method are extremely difficult, and huge manpower and financial resources are consumed. With the progress of scientific technology, the process design in the electromagnetic induction heating stage is shifted to computer simulation from the traditional method based on experience so as to rapidly obtain process parameters. A lot of researchers carry out a lot of research work on numerical simulation of the process of the electromagnetic induction heating stage, and research objects of the researches mainly focus on axisymmetric workpieces so as to guide production work of products.

Disclosure of Invention

The invention aims to provide a temperature testing device convenient for accurately researching an electromagnetic induction heating stage, and establish the rule of influence of technological parameters such as crankshaft rotation speed, heating time, heating temperature and the like on material performance so as to solve the problem that the technological parameters cannot accurately control the material performance in the heating stage and effectively improve the product percent of pass.

In order to realize the purpose, the invention provides the following technical scheme: the utility model provides a temperature test device convenient to accurate research electromagnetic induction heating stage which characterized in that: the device comprises a lower supporting plate, a motor support, a coupler, a stepped shaft, a bearing seat, a screw rod, an induction coil, an infrared thermometer and a central control module, wherein first bolts are connected to four corners of the lower supporting plate in a penetrating manner, an upper supporting plate is fixedly installed at the top ends of the first bolts, the motor support is fixedly installed on the left side of the top of the upper supporting plate, the stepping motor is fixedly installed on the left side wall of the motor support, a rotating shaft is fixedly connected to the power output end of the stepping motor, the coupler is fixedly installed at the right side end of the rotating shaft, the stepped shaft is fixedly installed at the right side end of the inner cavity of the coupler, the bearing seat is fixedly installed at the right side end of the top of the motor support, a bearing is clamped on the inner wall of the bearing seat, the stepped shaft is fixedly installed on the inner wall of the, the right side end of the screw rod is fixedly installed with the sample piece, the outer wall of the sample piece is connected with the induction coil in a laminating mode, the outer wall of the induction coil is fixedly installed with the magnetizer, the middle of the induction coil is fixedly installed with a crankshaft journal, the induction coil is electrically connected with the electromagnetic induction heating device through a wire, the infrared thermometer is placed at the right side end of the sample piece, the infrared thermometer is electrically output and connected with the central control module, the central control module is electrically and bidirectionally connected with the storage module, and the central control module is electrically output and connected with the stepping motor and the electromagnetic induction heating device.

Preferably, a tripod is fixedly mounted at the bottom of the infrared thermometer.

Preferably, a screw hole is formed in the right side end of the stepped shaft, and the inner wall of the screw hole is in threaded connection with the screw rod.

Preferably, circular draw-in groove has been seted up to the left side wall of bearing frame, circular draw-in groove inner wall joint the bearing, the through-hole has been seted up at the middle part of circular draw-in groove, the through-hole with the step shaft cooperation is connected.

Preferably, a rubber pad is fixedly mounted at the bottom of the lower supporting plate.

Compared with the prior art, the invention has the beneficial effects that: the invention provides a temperature testing device convenient for accurately researching an electromagnetic induction heating stage, which is provided with an induction coil, wherein the induction coil is used for heating a sample, an infrared thermometer is used for monitoring the heating temperature of the sample, the monitored result is transmitted to a central control module in real time, the central control module is used for analysis, and the central control module is used for controlling the rotating speed of a stepping motor and the heating time and the heating temperature of an electromagnetic induction heating device, so that the effective control of a workpiece is realized, and the qualification rate of products is improved.

Drawings

The invention is further illustrated with reference to the figures and examples.

FIG. 1 is a schematic diagram of the inventive structure;

FIG. 2 is a top view of the inventive structure;

FIG. 3 is a system block diagram of the inventive structure;

FIG. 4 is a schematic view of induction heating of the crankshaft journal of the present invention;

FIG. 5 is a line graph of the thermal conductivity of the invention;

FIG. 6 is a line plot of specific heat for the inventive structure;

FIG. 7 is a diagram of a finite element model of a structural crankshaft of the present invention;

fig. 8 is a flow chart of heat flow boundary condition addition for the inventive structure.

In the figure: 100 lower supporting plates, 110 first bolts, 120 upper supporting plates, 130 first nuts, 200 motor supports, 210 stepping motors, 220 rotating shafts, 230 second bolts, 300 couplers, 400 stepped shafts, 500 bearing seats, 510 bearings, 520 third bolts, 600 screws, 610 second nuts, 620 sample pieces, 700 induction coils, 710 electromagnetic induction heating equipment, 720 crankshaft journals, 730 magnetizers, 800 infrared thermometers, 810 tripods, 900 central control modules and 910 storage modules.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a technical scheme that: a temperature testing device convenient for accurately researching an electromagnetic induction heating stage is used for realizing real-time monitoring of workpiece temperature and controlling the rotating speed and heating time of a crankshaft sample, thereby improving the qualification rate of products, please refer to fig. 1 and 2, and comprises a lower support plate 100, a motor support 200, a coupler 300, a stepped shaft 400, a bearing seat 500, a screw 600, an induction coil 700, an infrared thermometer 800 and a central control module 900;

referring to fig. 1 and 2 again, the lower supporting plate 100 has a first bolt 110, an upper supporting plate 120 and a first nut 130, specifically, four corners of the lower supporting plate 100 and the upper supporting plate 120 are symmetrically provided with four first thread grooves (not marked in the figure) and four second thread grooves (not marked in the figure), the upper supporting plate 120 is fixedly installed at the top end of the first bolt 110 through the four first thread grooves, the four second thread grooves, the first bolt 110 and the first nut 130, the lower supporting plate 100 is used for fixedly installing the motor support 200 and the bearing seat 500, and the lower supporting plate 100 is made of stainless steel;

referring to fig. 1 and 2 again, the motor support 200 has a stepping motor 210, a rotating shaft 220 and a second bolt 230, the bottom of the motor support 200 is mounted on the top of the lower support plate 100, specifically, the rotating shaft 220 is fixedly connected to a power output end of the stepping motor 210, two third threaded grooves (not labeled in the figure) are formed in a right side wall of the stepping motor 210, two fourth threaded grooves (not labeled in the figure) with the same diameter and corresponding to the third threaded grooves are formed in a left side wall of the motor support 200, the stepping motor 210 is mounted on the motor support 200 through the two third threaded grooves, the two fourth threaded grooves and the fastening bolt, the motor support 200 is used for fixedly mounting the coupler 300, and the stepping motor 210 is a stepping motor 57BYG 56;

referring to fig. 1 and 2 again, the coupler 300 is installed on the right side wall of the motor support 200, specifically, the left side end of the coupler 300 is provided with a jack (not labeled in the figures), the rotating shaft 220 is inserted into the coupler 300 through the jack and a fastening bolt, the coupler 300 is used for fixedly installing the stepped shaft 400, and the coupler 300 is a quincunx coupler;

referring to fig. 1 and 2 again, the stepped shaft 400 is installed at the right end of the coupling 300, specifically, the stepped shaft 400 is installed at the left end of the coupling 300 through an insertion hole (not marked in the drawings) and a fastening bolt at the right side of the coupling 300, the stepped shaft 400 is used for fixedly installing the screw 600, and the stepped shaft 400 is made of stainless steel;

referring to fig. 1 and 2 again, the bearing seat 500 has a bearing 510 and a third bolt 520, the bottom of the bearing seat 500 is mounted on the top of the lower support plate 100, specifically, the bearing 510 is fastened to the inner wall of the bearing seat 500, a circular fastening groove is formed in the left side wall of the bearing seat 500, the bearing 510 is fastened to the inner wall of the circular fastening groove, a through hole is formed in the middle of the circular fastening groove, the through hole is connected to the stepped shaft 400 in a matching manner, two fifth threaded grooves (not labeled in the figure) are formed in the bottom of the bearing seat 500, two sixth threaded grooves (not labeled in the figure) with the same diameter as those of the fifth threaded grooves are formed in the top of the upper support plate 120, the bearing seat 500 is mounted on the lower support plate 100 through the two fifth threaded grooves, the two sixth threaded grooves and the fastening bolts, the bearing 510 is used for rotating;

referring to fig. 1 and fig. 2 again, the screw 600 has a second nut 610 and a sample 620, the screw 600 is installed on the right side wall of the stepped shaft 400, specifically, the right side end of the stepped shaft 400 is provided with a screw hole, the inner wall of the screw hole is screwed with the screw 600, the middle part of the screw 600 is screwed with the second nut 610, the right side end of the screw 600 is screwed with the sample 620, the second nut 610 is used for fixing the screw 600, the rear side arm of the screw 600 is fixedly installed with the induction coil 700, and the screw 600 is made of stainless steel;

referring to fig. 1 and fig. 2 again, the induction coil 700 has an electromagnetic induction heating device 710, a crankshaft journal 720 and a magnetizer 730, the induction coil 700 is installed on the rear side wall of the sample 620, specifically, the magnetizer (730) is clamped on the outer wall of the induction coil (700), the crankshaft journal (720) is clamped in the middle of the induction coil (700), the outer wall of the sample 620 is jointed and connected with the induction coil 700, the induction coil 700 is electrically connected with the electromagnetic induction heating device 710 through a conducting wire, and the electromagnetic induction heating device 710 is XJH-15KW high-frequency induction heating equipment;

referring to fig. 1 and 2 again, the infrared thermometer 800 has a tripod 810, the infrared thermometer 800 is mounted on the right side wall of the screw 600, specifically, the tripod 810 is fixedly mounted at the bottom of the infrared thermometer 800 through a bolt, and the infrared thermometer 800 is an ImageIR8325 thermal imager;

referring to fig. 3 again, the central control module 900 has a storage module 910, specifically, the central control module 900 is electrically connected to the storage module 910 in two directions, the output of the central control module 900 is electrically connected to the stepping motor 210 and the electromagnetic induction heating device 710, and the input of the central control module 900 is electrically connected to the infrared thermometer 800;

in a specific using process, when the invention is required to be used, the sample 620 is firstly fixed at the right side end of the screw 600, then the rotating shaft 220 on the stepping motor 210 is used for driving the stepped shaft 400 to rotate, the stepped shaft 400 rotates in the middle of the bearing 510, the stepped shaft 400 drives the sample 620 to rotate, then the induction coil 700 is used for rotatably heating the sample 620, meanwhile, the infrared thermometer 800 is used for monitoring the temperature of the surface of the sample 620, data is transmitted to the central control module 900, and the central control module 900 is used for controlling the rotation of the stepping motor 210 and the heating temperature of the electromagnetic induction heating device 710.

In order to prevent the lower support plate 100 from shaking greatly during operation, a rubber pad is bonded to the bottom of the lower support plate 100, so as to reduce noise generation and transmission.

The first thread groove, the second thread groove, the third thread groove, the fourth thread groove, the fifth thread groove, and the sixth thread groove are not limited to the specific number described in the present embodiment, and the number thereof may be increased or decreased as necessary.

Referring to fig. 4, the control of the mathematical model:

the control equation:

boundary conditions:

wherein the content of the first and second substances,

referring to FIGS. 5-7, a finite element model is constructed: the crankshaft journal 720 was 2D modeled using finite element software ABAQUS. In order to ensure the calculation precision, relatively dense grids are adopted in the skin depth of the crankshaft 2D model, and gradually thickened grids are adopted in the rest areas so as to reduce the calculation scale. On the basis of this, mesh convergence calculation was performed on the finite element model, which used a quadrilateral mesh of cells, and as a result, the finite element model contained 7264 cells in total, the skin cell size was 0.1mm × 0.15mm, and the cell type was C3D4T, as shown in fig. 7. The crankshaft is made of 42CrMo material, the elastic modulus is 2.1 multiplied by 105MPa, the Poisson ratio is 0.25, and the specific heat and the heat conduction coefficient along with the temperature change are shown in figure 5 and figure 6.

Referring to fig. 7 and 8, the thermal boundary conditions: according to the skin effect of electromagnetic induction heating of the crankshaft, the induced heat flow is mainly concentrated on the surface of the crankshaft and distributed in the corresponding region of the induction coil 700. Because the crankshaft and the induction coil 700 rotate relatively in the induction heating process, the induction mobile heat source adopts ABAQUS subprogram DFLUX to realize heatThe flow intensity varies with time and spatial position, and at a certain moment, with reference to the Y-axis of fig. 7, the corresponding heat flow value is obtained for the surface area of the crankshaft corresponding to the wrap angle of the induction coil 700. And the heating area of the crankshaft surface is continuously adjusted through the rotation angular velocity. Referring to FIG. 8, a flow chart of the process is shown in which the heating time, the rotational speed, and the wrap angle are inputted, and the heating time is set to t_iDetermining the angle of any node on the surface of the crankshaft, judging whether the angle is positioned in a heat flow node action area, setting q to q (r, theta) when the angle is positioned in the heat flow node action area, setting q to 0 when the angle is not positioned in the heat flow node action area, and judging the heating time t_iWhether the heating time is reached or not, if the heating time is not reached, the heating time is prolonged to t_i+1Then at a determined heating time t_i+1And t thereof_i+1The rotation angles are circulated in sequence until the heating time is met, and the task is finished.

The combined heat transfer coefficient was used to simulate radiant and convective heat transfer.

h_c＝2.41×10^-3εT^1.61

Where ε is the emissivity. And (4) performing comparison by adopting the mathematical deduction of the electromagnetic induction heating process, and verifying the correctness of the finite element model established by adopting the subprogram.

Response surface analysis: the concept of temperature field uniformity and relative temperature difference was used to evaluate the uniformity of the temperature field behind the mixer.

Temperature uniformity e_TIs defined as:

in the formula, average temperature is shown, N is the number of measuring points, the temperature of a certain point is shown, and the definition of relative temperature is shown, so that the orthogonal test method has balanced dispersity and uniformity comparability. For a steel material of a certain diameter, the factors influencing the thickness of the hardened layer include the crankshaft speed, the coil wrap angle, the heating time, the current magnitude and the heating frequency, as shown in the following table.

After fitting the regression equation, statistical analysis is needed to solve the following four problems:

a) and (3) giving significance test of the regression equation, and judging whether the regression equation is effective on the whole:

the regression equation was tested for significance using analysis of variance. The ratio of the mean square and the SSR and SSE will be the most representative result of measuring whether the regression equation is significant or not. If the ratio is large enough, there is reason to negate the original assumption that the regression model is meaningless, and the regression should be considered significant.

b) And (3) giving a measurement standard of the total effect of the regression equation:

if the actual observed value is close to the fitted regression line, the fitting of the regression line and the data is good, and the total effect of the regression equation is good. The overall effect of the regression equation is typically measured by three metrics: r2, R-sq (adjusted) and s. R2 measures the ability of the regression equation to interpret observed data variation, which is the ratio of the sum of squares of regression to the sum of squares of total dispersion, with values closer to 1 representing better modeling. The R-sq takes the influence of the increase of the total number of terms of the model into consideration, and the R-sq is < R2, and the closer the values of the R-sq and the R-sq are, the better the model fitting is. The residual standard deviation s is measured from the mean deviation of the observed values from the fitted regression line, with values as small as possible.

c) When the regression equation has a remarkable effect, performing significance test on each regression coefficient, judging that independent variables in the regression equation are remarkable, and deleting the independent variables with insignificant effect to optimize the model, wherein the significance test is particularly important in multiple regression;

the overall effect of regression was analyzed on the F-test in ANOVA, and the t-test was performed to determine whether each independent variable was significant.

d) Residual diagnosis-checking whether the data fit our basic assumptions for regression, checking whether the entire regression model fits well to the data, and whether the regression equation can be further refined to optimize our model.

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.