CN114340057B - Conductive heating device for eliminating conductive heating deformation of ultrathin metal plate - Google Patents

Abstract

Disclosed is a conductive heating apparatus for eliminating conductive heating deformation of an ultra-thin metal plate, which is capable of operatively heating an ultra-thin metal plate having a thickness of 0.03mm to 0.15mm at a heating rate of 10 to 1500 ℃/s, comprising: the device comprises a base and two clamping electrode mechanisms arranged on the base. A clamping area for placing an ultrathin metal plate is arranged between the two clamping electrode mechanisms, and the ultrathin metal plate comprises a main body part and clamped ends which are respectively positioned at two ends of the main body part along the length direction of the ultrathin metal plate. The width of the clamped end is larger than that of the main body part, and the width of the main body part is constant in the length direction. The electrode clamping mechanism comprises an insulating electric wood clamp and an electrode arranged at the clamping end of the insulating electric wood clamp. The other end of the insulating electric wood clamp, which is far away from the clamping end, is provided with a clamping system for controlling the clamping release of the clamping end, and at least one of the two clamping electrode mechanisms is movable along the length direction of the ultrathin metal plate.

Description

Conductive heating device to eliminate conductive heating deformation of ultra-thin metal plate

technical field

The disclosure relates to the technical field of metal heat treatment, in particular to a conductive heating device for eliminating the deformation of an ultra-thin metal plate by conductive heating.

Background technique

At present, in order to achieve the purpose of rapid heating of metals, many materials and materials simulation equipment such as thermal simulation test machines usually adopt the method of direct electrode conduction heating, and use the heating transformer to provide a certain voltage to the sample, so that a large current passes through the test, and use the sample itself Resistance achieves heating purpose.

However, due to its ultra-thin characteristics, the critical compressive stress of the ultra-thin stainless steel plate is much smaller than that of the thick plate, and it is more prone to compression instability, resulting in failure and damage of the sample, which is difficult to meet the simulation requirements. Specifically, as shown in Figure 1 and Figure 2, the ultra-thin metal sheet is bent along the length direction of the sheet (Figure 1) and wrinkled along the width direction of the sheet (Figure 2) after applying current heating.

Contents of the invention

After a long period of research by the inventor, it was found that the reason for the above problems is that the thermal expansion of the sheet material is caused by the temperature rise, but the fixed electrode limits the thermal expansion of the sheet material, resulting in thermal stress inside the sheet material. When the thermal stress value is higher than the critical value of the sheet material If the instability stress value is lower, the sheet metal will wrinkle and become unstable.

In order to solve at least one of the problems of bending in the longitudinal direction and wrinkling in the width direction of the above-mentioned samples during the conductive heating process, an object of the present disclosure is to provide a conductive heating device that eliminates the deformation of the ultra-thin metal plate by conductive heating.

Another object of the present disclosure is to provide an ultra-thin metal plate to avoid wrinkling in the width direction of the plate during conductive heating.

In order to achieve at least one of the above objectives, the present disclosure adopts the following technical solutions:

A conductive heating device for eliminating conductive heating deformation of an ultra-thin metal plate, comprising: a base, and two clamping electrode mechanisms arranged on the base. A clamping area for placing an ultra-thin metal plate is provided between the two clamping electrode mechanisms. The ultra-thin metal plate includes a main body and clamped ends respectively located at both ends of the main body along the length direction of the ultra-thin metal plate; The width of the holding end is greater than the width of the main body, and the width of the main body is constant along the length direction. The clamping electrode mechanism includes an insulating bakelite clamp and an electrode arranged at the clamping end of the insulating bakelite clamp; the other end of the insulating bakelite clamp away from the clamping end is provided with a clamping system for controlling the clamping and releasing of the clamping end. At least one of the two clamping electrode mechanisms is movably arranged along the length direction of the ultra-thin metal plate.

Preferably, the second clamping electrode mechanism is fixedly arranged on the base, and the first clamping electrode mechanism is movably arranged on the base along the length direction of the ultra-thin metal plate at the initial position of clamping the ultra-thin metal plate is applied with a force away from the moving direction of the second clamping electrode mechanism.

Preferably, the base is fixed with a guide rail extending along the length direction of the ultra-thin metal plate; the first clamping electrode mechanism is slidably arranged on the guide rail; An elastic member for clamping the electrode mechanism; the elastic member applies a force to the first clamping electrode mechanism to move away from the ultra-thin metal plate; When the mechanism clamps the ultra-thin metal plate, an active force greater than or equal to the frictional force between the first clamping electrode mechanism and the guide rail is applied to the first clamping electrode mechanism.

Preferably, the elastic member is at least one tension spring in a stretched state when the first clamping electrode mechanism clamps the ultra-thin metal plate.

Preferably, the force of the elastic member to the first clamping electrode mechanism is adjustable.

Preferably, the elastic member adjusts the force applied to the first clamping electrode mechanism by detachably increasing or decreasing the number of tension springs and/or replacing tension springs with different elastic moduli.

Preferably, a slider is provided at the bottom of the first clamping electrode mechanism; the slider is set in a track groove of a guide rail extending along the length direction of the ultra-thin metal plate.

Preferably, the insulating bakelite clamp includes a lower clamp body and an upper clamp body; the upper clamp body is rotatably mounted on the lower clamp body through a pivot shaft; the clamping end of the lower clamp body is fixed with a lower An electrode plate, the clamping end of the upper clamping body is provided with a mounting groove; the T-shaped upper electrode plate located above the lower electrode plate is fixedly installed in the mounting groove; the end of the lower clamping body away from the clamping end is provided with a convex Lifting the platform; the clamping system includes an eccentric wheel rotatably installed on the end of the upper clamp body away from the clamping end; the eccentric wheel is rotatably attached to the raised platform and fixed pole.

Preferably, the guide rail is arranged on a guide rail support plate; the guide rail support plate includes a support plate body and a bearing protruding end located at one end of the support plate body; a plurality of tension springs can be independently and detachably connected in parallel to the load bearing Between the protruding end and the lower clamp body; the lower clamp body is supported on the support plate in a translational manner.

Preferably, the two guide rails are arranged in parallel on the guide rail support plate to slidably support the first clamping electrode mechanism.

Preferably, the electrodes are copper electrodes or stainless steel electrodes.

An ultra-thin metal plate applied to the conductive heating device described in any one of the above, the ultra-thin metal plate has a main body extending along a first direction; the main body has two parallel (width) sides, Clamped ends are respectively provided at both ends along the first direction (length direction); in the width direction perpendicular to the first direction and the thickness direction, the width of the clamped end is larger than that of the main body Width: The width of the main body along the first direction is constant; the main body and the clamped ends at both ends are integrally formed.

Preferably, the ultra-thin metal plate has a mirror-symmetrical structure in the width direction or the first direction.

Preferably, the width of the clamped end is more than twice the width of the main body.

Preferably, there is a transition portion between the clamped end and the main body; the width of the transition portion gradually increases when extending from the main body to the clamped end; the transition portion is at the first The length in the first direction is greater than the length of the clamped end in the first direction; the width of the clamped end in the first direction is constant.

The conductive heating device of this embodiment clamps the ultra-thin metal plate as the sample by two clamping electrode mechanisms, and at least one of the two clamping electrode mechanisms is movably arranged along the length direction of the ultra-thin metal plate, The degree of freedom in the length direction of the copper electrode plate on one side is released, and the ultra-thin metal plate expands and elongates after being energized and heated, and the tension spring will pull one of the clamping electrode mechanisms to move, so that the plate can be stretched freely, avoiding the plate Unsteady bending of the material along the length direction.

The ultra-thin metal plate of this embodiment can reduce the current density of the clamped end by increasing the width of the clamped end of the sheet material, so that the clamped end has a lower temperature when energized and heated, thereby reducing the thermal stress of the clamped end of the sheet material, Eliminate wrinkling in the width direction of the sheet.

Description of drawings

Fig. 1 is the schematic diagram of bending in the longitudinal direction of the existing rectangular sample;

Fig. 2 is the schematic diagram of wrinkling in the width direction of the existing rectangular sample;

Fig. 3 is a schematic structural diagram of a conductive heating device according to an embodiment of the present disclosure;

Fig. 4 is another perspective view of Fig. 3;

Fig. 5 is a structural schematic diagram of an ultra-thin metal plate and an existing sample provided by an embodiment of the present disclosure;

Fig. 6 is the conductive heating test result figure of Fig. 5;

Fig. 7 is a graph showing the unbent result of the ultra-thin metal plate being clamped in Fig. 3 and subjected to conductive heating.

Detailed ways

The conductive heating device of the embodiment of the present invention can realize heating of an ultra-thin metal plate with a thickness of 0.03-0.15 mm at a heating rate of 10-1500° C./s. Wherein, the heating rate depends on the thickness of the metal plate. Specifically, the greater the thickness of the metal plate, the lower the corresponding heating rate.

For example, in an applicable scenario, the ultra-thin metal plate is an electrode plate for a lithium battery, and the thickness can be less than 0.15 mm, and the thickness range is further between 0.04 and 0.1 mm, and the thickness range is further between 0.05 and 0.075 mm. between. In this scenario, the conductive heating device can achieve a heating rate above 1000°C, and can heat the electrode plate for lithium batteries to the desired temperature in a very short time.

In another expanded application scenario, the conductive heating device of this embodiment can also heat thicker metal plates, such as automobile plates (thickness can reach 2mm). Then, in the applicable scene where the thickness is greater, the device of this embodiment can achieve a heating rate of about several hundred degrees Celsius per second.

As shown in Fig. 3 to Fig. 7, the conductive heating device according to one embodiment of the present disclosure includes a base 100, a first clamping electrode mechanism 200a and a second clamping electrode mechanism 200b arranged on the base 100, the first clamping electrode mechanism 200a and A clamping area for placing the ultra-thin metal plate 300 is provided between the second clamping electrode mechanisms 200b.

The ultra-thin metal plate 300 is made of copper or stainless steel, that is, the electrodes are copper electrodes or stainless steel electrodes. The thickness of the ultra-thin metal plate 300 is less than 0.1 mm, and further, the thickness of the ultra-thin metal plate 300 ranges from 0.05 to 0.075 mm.

As shown in FIG. 3 and FIG. 4 , the clamping electrode mechanisms 200a and 200b include insulating bakelite clamps and electrodes provided at the clamping ends of the insulating bakelite clamps. The other end of the insulating bakelite clamp away from the clamping end is provided with a clamping system 230 for controlling the clamping and releasing of the clamping ends (2151, 2011). At least one of the first clamping electrode mechanism 200 a and the second clamping electrode mechanism 200 b is movably arranged along the length direction of the ultra-thin metal plate 300 .

7, the ultra-thin metal plate 300 as a sample is clamped by the first clamping electrode mechanism 200a and the second clamping electrode mechanism 200b, and at least one of the two clamping electrode mechanisms 200a, 200b along the The length direction of the ultra-thin metal plate 300 is movably set, so that the degree of freedom in the length direction of the plate (copper electrode) on one side is released, and the expansion and elongation of the ultra-thin metal plate 300 will push one of the clamps after power is applied and heated. The electrode mechanism 200a/200b moves so that the sheet material can be stretched freely, avoiding the unstable bending of the sheet material along the length direction.

As shown in FIG. 3 and FIG. 4 , the base 100 is a plate structure, and the first clamping electrode mechanism 200 a and the second clamping electrode mechanism 200 b are assembled on the base 100 opposite to each other left and right. More specifically, the base 100 is a rectangular frame structure, and the clamping area is located above the vacant area of the rectangular frame. The first clamping electrode mechanism 200a and the second clamping electrode mechanism 200b are assembled on the left and right borders of the base 100, so that the sheet material is suspended and clamped between the first clamping electrode mechanism 200a and the second clamping electrode mechanism 200b.

The base 100 is fixed with a guide rail 240 extending along the length direction of the ultra-thin metal plate 300 . The first clamping electrode mechanism 200 a is slidably arranged on the guide rail 240 , and the second clamping electrode mechanism 200 b is fixedly assembled on the base 100 . The base 100 is further provided with an elastic member 50 connected to the first clamping electrode mechanism 200 a , and the elastic member 50 applies a force to the first clamping electrode mechanism 200 a to move away from the ultra-thin metal plate 300 .

In order to avoid the friction force between the first clamping electrode mechanism 200a and the guide rail hindering the free extension of the ultra-thin metal plate 300 and causing instability, the elastic member 50 can move toward the first clamping electrode mechanism 200a when clamping the ultra-thin metal plate 300 A clamping electrode mechanism 200a applies a force greater than or equal to the frictional force between the first clamping electrode mechanism 200a and the guide rail.

At the same time, in order to avoid excessive stretching of the sheet material in the initial state, the force exerted by the elastic member 50 is less than 2 times, and further less than 1.5 times, the friction force of the first clamping electrode mechanism 200a. For example, the first clamping electrode mechanism 200a can move slowly under the pull of the elastic member 50 under the condition of unloading the plate. In addition, the ultra-thin metal plate 300 is stably clamped between the first clamping electrode mechanism 200a and the second clamping electrode mechanism 200b under the pulling force of the elastic member 50, which can also eliminate the impact of the ultra-thin metal plate 300's own gravity. The bending effect caused by it eliminates the adverse effect of gravity on the ultra-thin metal plate 300 during the heating process.

The elastic member 50 is at least one tension spring in a stretched state when the first clamping electrode mechanism 200a clamps the ultra-thin metal plate 300 . The force applied by the elastic member 50 to the first clamping electrode mechanism 200a is adjustable. The elastic member 50 can realize desired adjustment of applied force by increasing or decreasing the number of extension springs or replacing springs with different elastic modulus, so as to adapt to plates (ultra-thin metal plates 300 ) of different lengths or strengths.

The guide rail 240 is equipped on the conductive heating device, so that the degree of freedom of the ultra-thin metal plate 300 on one side is released in the length direction. Unsteady bending of the material along the length direction.

In order to reduce the movement resistance of the first clamping electrode mechanism 200a and facilitate the release of the degree of freedom when the ultra-thin metal plate 300 is heated, a slider is provided at the bottom of the first clamping electrode mechanism 200a, and the slider is located along the ultra-thin metal plate 300. In the track groove of the guide rail extending in the length direction.

The first clamping electrode mechanism 200a and the second clamping electrode mechanism 200b are configured to form a movable electrode structure, and the electrodes are copper electrodes. Of course, the electrodes can also be electrodes made of other metal materials such as stainless steel. The electrodes include a lower electrode plate 215 and a T-shaped upper electrode plate 210 . The lower electrode plate 215 and the T-shaped upper electrode plate 210 are made of copper. The conductive heating device can steerably heat an ultra-thin metal plate with a thickness of 0.05mm-1mm at a heating rate of 10-1500°C/s. Wherein, the lower electrode plate 215 can be operably supplied with a desired voltage. The first clamping electrode mechanism 200a and the second clamping electrode mechanism 200b are configured as positive and negative poles, which heat the plate by conduction.

As shown in FIG. 4 , the insulating Bakelite clamp includes a lower clamp body 202 and an upper clamp body 201 , and the upper clamp body 201 is rotatably mounted on the lower clamp body 202 through a pivot shaft. The clamping end of the lower clamping body 202 is fixed with a lower electrode plate 215 , and the clamping end of the upper clamping body 201 is provided with a mounting groove. A T-shaped upper electrode plate 210 located above the lower electrode plate 215 is fixedly installed in the installation groove, and the upper end of the T-shaped upper electrode plate 210 is embedded in the installation groove.

The lower electrode plate 215 is a rectangular plate, providing a rectangular carrying upper surface. The lower electrode plate 215 is controllably energized. The upper surface of the lower electrode plate 215 for receiving the sample is larger than the lower surface of the upper electrode plate 210 . An end of the lower clamping body 202 away from the clamping end 2151 is provided with a raised platform. The clamping system 230 includes an eccentric wheel 231 rotatably mounted on the end of the upper clamp body 201 away from the clamping end 2011 . The eccentric wheel 231 is rotatably attached to the raised platform and is fixed with a force applying rod 235 . The longitudinal section of the lower clip body 202 is L-shaped. The lower surface of the lower clip body 202 is a plane. The force applying rod 235 exerts force outward to prop up the outer end of the upper clamp body 201 , and presses down the clamping end 2011 of the upper clamp body 201 , thereby clamping the sheet material.

The guide rail 240 is arranged on the guide rail support plate. The guide rail support plate includes a support plate body 242 and a bearing protruding end 243 located at one end of the support plate body 242 . The two guide rails 240 are parallel and fixed on the support board 242 . The longitudinal section of the guide rail support plate is L-shaped. A plurality of tension springs can be independently detachably connected in parallel between the bearing protruding end 243 and the lower clip body 202 , and the lower clip body 202 is supported on the supporting plate body 242 in a translational manner. The rail support plate is fixedly supported on the base 100 through the support plate 241 .

After long-term research, the inventor found that the wrinkling of the sheet metal instability is due to the thermal stress being greater than the critical instability stress of the sheet metal. Therefore, by reducing the thermal stress of the sheet metal and increasing the critical stress of the sheet material instability, the problem in the width direction of the sheet metal can be effectively solved. H's wrinkling problem.

Based on the above findings, the inventor, as shown in FIG. 5 , provides an ultra-thin metal plate 300 in an embodiment of the present disclosure, and the ultra-thin metal plate 300 can be used as a sample in the conductive heating device of any of the above embodiments. . The combination of the conductive heating device in the above embodiment and the ultra-thin metal plate 300 in this embodiment can effectively eliminate the wrinkling and instability of the ultra-thin metal plate 300 .

The ultra-thin metal plate 300 is integrally formed and has a main body 305 extending along the first direction F. As shown in FIG. The main body portion 305 has two parallel sides, and two ends along the first direction F are respectively provided with clamped ends 301 . In the width direction H perpendicular to the first direction F and the thickness direction, the width of the clamped end 301 is larger than the width of the main body portion 305 . The width of the main body portion 305 along the first direction F is constant.

The main body part 305 and the clamped ends 301 at both ends are integrally formed. As shown in Figure 6, the ultra-thin metal plate 300 of this embodiment can reduce the current density of the clamped end 301 by increasing the width of the clamped end 301 of the plate, so that the clamped end has a lower temperature, thereby reducing the thermal stress at the clamping end of the sheet, and eliminating the wrinkling phenomenon in the width direction H of the sheet.

The ultra-thin metal plate 300 is a mirror-symmetrical structure in the width direction H or the first direction F, for example, the ultra-thin metal plate 300 is I-shaped. As shown in FIG. 6 , it can be seen that compared with the existing rectangular sample, the I-shaped sample does not have the problem of bending and wrinkling after being conductively heated by the conductive heating device of the above embodiment. However, under the same voltage condition, the conductive heating device located at the fixed electrode

There is a transition portion 302 between the clamped end 301 and the main body portion 305 , and the transition portion 302 gradually increases in width when extending from the main body portion 305 to the clamped end 301 . The length of the transition portion 302 in the first direction F is greater than the length of the clamped end 301 in the first direction F. The clamped end 301 has a constant width in the first direction F. The transition part 302 has a trapezoidal structure, and the main body part 305 and the clamped end 301 are respectively located on the short side and the long side of the transition part 302 . In the first direction F (the length direction of the ultra-thin metal plate 300 ), the length of the clamped end 301 is shorter than that of the main body 305 , and the length of the transition portion 302 is shorter than that of the main body 305 . The lengths of the transition portion 302 and the clamped end 301 are approximately equal to the length of the main body portion 305 .

The width of the clamped end 301 is more than twice the width of the main body 305 . As shown in FIG. 5 , the clamped end 301 has a width of 75 mm, and the width of the main body portion 305 is 30 mm. The main body portion 305 is arranged centrally with respect to the clamped end 301 , and there is a trapezoidal transition portion 302 between them, and both sides of the width of the transition portion 302 are symmetrical hypotenuse structures.

The above are only a few embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the content disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims (5)

1. A conductive heating device for eliminating conductive heating deformation of an ultrathin metal plate, wherein the conductive heating device is used for heating the ultrathin metal plate with the thickness ranging from 0.05mm to 0.075mm at a heating rate of 1000 ℃/s to 1500 ℃/s in an operating way;

the conductive heating device is characterized by comprising:

a base;

the first clamping electrode mechanism and the second clamping electrode mechanism are arranged on the base; a clamping area for placing an ultrathin metal plate is arranged between the first clamping electrode mechanism and the second clamping electrode mechanism; the ultrathin metal plate comprises a main body part and clamped ends respectively positioned at two ends of the main body part along the length direction of the ultrathin metal plate; the width of the clamped end is larger than that of the main body part; the width of the main body part is constant in the length direction;

the electrode clamping mechanism comprises an insulating electric wood clamp and an electrode arranged at the clamping end of the insulating electric wood clamp; the other end of the insulating electric wood clamp far away from the clamping end is provided with a clamping system for controlling the clamping release of the clamping end; at least one of the first clamping electrode mechanism and the second clamping electrode mechanism is movably arranged along the length direction of the ultrathin metal plate;

a transition part is arranged between the clamped end and the main body part; the width of the transition part gradually increases when the transition part extends from the main body part to the clamped end; the length of the transition part is longer than that of the clamped end along the length direction of the ultrathin metal plate; the width of the clamped end in the length direction is constant; the width of the clamped end is more than 2 times of the width of the main body part;

the second clamping electrode mechanism is fixedly arranged on the base, the first clamping electrode mechanism is movably arranged on the base along the length direction of the ultrathin metal plate, and the first clamping electrode mechanism is applied with a force which is far away from the moving direction of the second clamping electrode mechanism at the initial position of clamping the ultrathin metal plate;

the base is fixedly provided with a guide rail extending along the length direction of the ultrathin metal plate; the first clamping electrode mechanism is slidably arranged on the guide rail; the base is also provided with an elastic piece connected with the first clamping electrode mechanism; the elastic piece applies acting force to the first clamping electrode mechanism, wherein the acting force moves in a direction away from the ultrathin metal plate; the elastic piece can apply an action force which is larger than or equal to the friction force between the first clamping electrode mechanism and the guide rail to the first clamping electrode mechanism when the first clamping electrode mechanism clamps the ultrathin metal plate; the acting force exerted by the elastic piece is less than 2 times of the friction force of the first clamping electrode mechanism;

the insulating bakelite clamp comprises a lower clamp body and an upper clamp body; the upper clamp body is rotatably arranged on the lower clamp body through a pivot shaft, and a lower electrode plate is fixed at the clamping end of the lower clamp body; the clamping end of the upper clamp body is provided with a mounting groove, and a T-shaped upper electrode plate positioned above the lower electrode plate is fixedly arranged in the mounting groove; a protruding table is arranged at one end of the lower clamp body, which is far away from the clamping end; the clamping system comprises an eccentric wheel rotatably arranged at one end, far away from the clamping end, of the upper clamp body, and the eccentric wheel is rotatably attached to the boss and fixedly provided with a force application rod.

2. The conductive heating apparatus as set forth in claim 1, wherein said elastic member is at least one tension spring in a stretched state when said first clamping electrode mechanism clamps said ultra-thin metal plate.

3. The conductive heating apparatus as set forth in claim 2, wherein the elastic member adjusts the force to the first clamping electrode mechanism by removably increasing or decreasing the number of tension springs and/or replacing tension springs of different elastic moduli.

4. The conductive heating apparatus of claim 1, wherein a slider is provided at the bottom of the first clamping electrode mechanism; the sliding block walking is arranged in a track groove of a guide rail extending along the length direction of the ultrathin metal plate.

5. The conductive heating apparatus of claim 4, wherein the rail is provided on a rail support plate; the guide rail supporting plate comprises a supporting plate body and a bearing convex end positioned at one end of the supporting plate body; the tension springs can be independently and detachably connected between the bearing convex ends and the lower clamp body in parallel respectively; the lower clamp body is supported on the supporting plate body in a translation mode.

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