Current automatic reversing device and method for reversible electroplastic rolling

Abstract

The invention discloses an automatic current reversing device and method for reversible electro-plastic rolling, and relates to the field of metal plastic processing auxiliary equipment. The device comprises a driving assembly, a supporting and fixing assembly, a conductive assembly and an insulating assembly; the driving assembly comprises a telescopic cylinder, the supporting and fixing assembly comprises a base located at the bottom of the telescopic cylinder, a bottom plate located at the top of the telescopic cylinder and a fixing plate located above the bottom plate and parallel to the bottom plate, the fixing plate is located at the stroke end point of a push rod of a telescopic rod, and the bottom plate and the fixing plate are connected through a stud. The conductive assembly comprises a supporting plate which is connected with the telescopic rod and can move up and down, first conductive copper plates are arranged on the upper surface and the lower surface of the supporting plate, and second conductive copper plates matched with the first conductive copper plates are arranged at the top of the bottom plate through bosses. And a third conductive copper plate matched with the first conductive copper plate is arranged at the bottom of the fixed plate. According to the invention, automatic, real-time and accurate matching of the current path and the rolling direction is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal plastic processing auxiliary equipment, and particularly relates to a current automatic reversing device and method for reversible electric plastic rolling. BACKGROUND

[0002] In the field of difficult-to-deform metal processing, the electric plastic rolling technology has become a key technology for rolling materials such as magnesium alloy and titanium alloy, by virtue of the advantages of reducing material flow stress and improving deformation capacity through pulse current. However, the current direction of the traditional one-way electric rolling device is fixed, and multi-pass rolling needs to rely on roll lifting and rewinding operations. Not only is the equipment structure poor in adaptability, but also the reversing process relies on manual adjustment, which has problems such as slow response and low positioning accuracy.

[0003] In contrast, the reversible electric rolling technology realizes rapid switching of the rolling direction, eliminates the intermediate rewinding process, greatly improves production efficiency, and avoids the decline in strip surface quality caused by multiple loading and reversing. In addition, reversible rolling combined with real-time reversing of the current direction can more fully utilize the electric plastic effect, and is particularly suitable for efficient processing of high-strength and difficult-to-deform metals. However, most existing reversible electric rolling systems still rely on manual or semi-automatic current reversing, which is slow and low in accuracy, and cannot meet the requirements of high-speed continuous rolling. More importantly, the existing technology has not fundamentally realized the precise coordination of the current reversing and the rolling direction switching in time and space. The lack of such coordination results in the electric plastic effect not being fully and consistently utilized in bidirectional rolling, thereby limiting the potential of reversible electric rolling technology in efficient processing of difficult-to-deform materials.

[0004] Therefore, developing a device capable of automatically, quickly and accurately switching the current direction and ensuring real-time synchronization with the rolling direction has become a key to promoting the development of reversible electric rolling technology. SUMMARY

[0005] In order to solve the problems of low efficiency, complex operation and easy damage to materials in the existing one-way electric rolling process, and the problem that the electric plastic effect is not fully utilized due to the asynchronization of current reversing and rolling direction switching in reversible rolling, the present application provides a current automatic reversing device and method for reversible electric plastic rolling, which realizes automatic, real-time and accurate matching of the current path and the rolling direction through a pneumatic / hydraulic driving mechanism. The device realizes rapid switching of the current path through pneumatic / hydraulic driving, can be seamlessly integrated with the rolling mill control system, and realizes fully automatic reversible rolling.

[0006] The technical scheme adopted by the current automatic reversing device and method for reversible electric plastic rolling provided by the present application is as follows: The application discloses a current automatic reversing device for reversible electroplastic rolling, which comprises a driving assembly, a supporting and fixing assembly, a conductive assembly and an insulating assembly.

[0007] Further improvement of the technical scheme of the application is that the plurality of studs are evenly distributed in a ring shape, and the fixing plate is provided with a plurality of through holes matched with the plurality of studs, and the height of the fixing plate is adjusted by the upper and lower double nuts at each through hole.

[0008] Further improvement of the technical scheme of the application is that the second conductive copper plate is provided with two pieces, and the two pieces are respectively connected with a positive pole of a pulse power supply and a first side conductive roller of a rolling mill through wires; the third conductive copper plate is connected with a second side conductive roller of the rolling mill through a wire; and the first conductive copper plate is directly connected with the positive pole of the pulse power supply through a wire.

[0009] Further improvement of the technical scheme of the application is that the control system comprises an air compressor / hydraulic machine connected with the telescopic cylinder, an air source processor and a hand valve.

[0010] Further improvement of the technical scheme of the application is that the boss is made of 304 stainless steel, and the first conductive copper plate, the second conductive copper plate, the third conductive copper plate, the supporting plate, the bottom plate and the fixing plate are all made of brass.

[0011] Further improvement of the technical scheme of the application is that the telescopic cylinder is a hydraulic cylinder or an air cylinder.

[0012] Further improvement of the technical scheme of the application is that the insulating assembly is an insulating gasket arranged at the connection positions of the fixing plate and the stud and the connection position of the stud and the bottom plate.

[0013] A current automatic reversing method for reversible electroplastic rolling is provided. S1, the push rod of the telescopic cylinder is controlled to be at the lower stroke end point, so that the first conductive copper plate on the lower surface of the supporting plate is in close contact with the second conductive copper plate of the boss. S2, set the rolling parameters including rolling force and rolling speed through the rolling mill PLC, set the output voltage, current frequency and pulse width through the pulse power supply; S3, start the pulse power supply, the current forms a path through the pulse power supply positive electrode→the first conductive copper plate→the second conductive copper plate→the first side conductive roller of the rolling mill→the strip→the working roller→the pulse power supply negative electrode; S4, start the rolling mill and the coiler, the coiler establishes the set tension, and the strip completes the forward rolling pass under the action of the electroplastic effect; S5, the rolling mill sensor detects the completion of the forward rolling pass, sends a signal to the PLC, the PLC controls the rolling mill to slow down and stop, and the coiler keeps a slight tension; S6, the PLC triggers the control system to switch the gas circuit / oil circuit, drives the push rod of the telescopic cylinder to rise to the end of the stroke, so that the first conductive copper plate on the upper surface of the supporting plate is in contact with the third conductive copper plate; S7, the pulse power supply keeps running, and the current is switched to the pulse power supply positive electrode→the first conductive copper plate→the third conductive copper plate→the second side conductive roller of the rolling mill→the strip→the working roller→the pulse power supply negative electrode; S8, the PLC controls the rolling mill to reverse, adjusts the rolling force parameters, the coiler reversely establishes the tension, and the strip completes the reverse rolling pass.

[0014] The further improvement of the above technical scheme of the present application is that the parameter adaptation step is further included: for different difficult-to-deform metals, the rolling force, the pulse power supply voltage and the control system output pressure are adjusted; wherein the rolling force of the magnesium alloy is set to 90-110KN, the voltage is 80-100V, the rolling force of the titanium alloy is set to 120-140KN, the voltage is 100-120V, and the rolling force of the zinc alloy is set to 70-90KN, the voltage is 60-80V.

[0015] Thanks to the above technical scheme, the present application has the following technical progress: The present application realizes 1-2 second fast reversing through the telescopic cylinder driving and the positioning of the position sensor; the present application ensures that the current reversing and the rolling mill reversing are completely synchronous through the signal interaction between the PLC and multiple systems. The present application defines the step flow of the forward / reverse rolling, and formulates the parameter adaptation scheme for the magnesium alloy, the titanium alloy and the zinc alloy respectively, so that the randomness of manual adjustment is avoided. The present application omits the roll lifting and the rewinding operation, avoids the damage of the strip through the slight tension control, shortens the non-rolling time and improves the equipment utilization. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structure schematic view of the current automatic reversing device for the reversible electroplastic rolling of the present application; Figure 2 It is a flow chart when the forward rolling of the current automatic reversing method for the reversible electroplastic rolling of the present application; Figure 3 Flow chart for the current automatic reversing method of the present application for reversible electroplastic rolling during reverse rolling; Figure 4 Lead connection relationship diagram of the current automatic reversing device for reversible electroplastic rolling.

[0017] In the drawings: 1, telescopic cylinder; 2, base; 3, bottom plate; 4, fixed plate; 5, stud; 6, support plate; 7, first conductive copper plate; 8, second conductive copper plate; 9, boss; 10, third conductive copper plate. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be given below in conjunction with specific embodiments and with reference to the drawings. In the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0019] Example 1 As shown in Figure 1 and Figure 4 , the present embodiment provides a current automatic reversing device for reversible electroplastic rolling, which comprises a driving assembly, a support and fixing assembly, a conductive assembly and an insulation assembly.

[0020] The driving assembly in the present embodiment is a telescopic cylinder 1, which is selected from a pneumatic cylinder / hydraulic cylinder.

[0021] The support and fixing assembly comprises a base 2, a bottom plate 3, a stud 5 and a fixed plate 4; wherein the base 2 is fixedly connected with the bottom of the telescopic cylinder 1, the bottom plate 3 is fixedly connected with the top of the telescopic cylinder 1, and the push rod of the telescopic cylinder 1 penetrates through the bottom plate 3, and the upper surface of the bottom plate 3 is fixedly connected with a boss 9. The bottom end of the stud 5 is fixedly connected with the bottom plate 3, and the top end of the stud 5 is fixedly connected with the fixed plate 4, and the fixed plate 4 is located at the end point of the upstroke of the push rod.

[0022] In the present embodiment, the number of the stud 5 is 8, which is evenly distributed in a ring shape, and 8 through holes corresponding to the 8 studs 5 are formed on the fixed plate 4, and the height of the fixed plate 4 is adjusted by the upper and lower double nuts at each through hole.

[0023] The conductive assembly comprises a first conductive copper plate 7, a second conductive copper plate 8, a third conductive copper plate 10 and a support plate 6. The support plate 6 is fixedly connected with the push rod of the telescopic cylinder 1, and the first conductive copper plate 7 is fixed on the upper and lower surfaces of the support plate 6, the second conductive copper plate 8 is fixed on the top of the boss 9, and the third conductive copper plate 10 is fixed on the bottom of the fixed plate 4. The push rod drives the support plate 6 to move up and down through the telescopic cylinder 1, so that the first conductive copper plate 7 of the support plate 6 alternately contacts the second conductive copper plate 8 / third conductive copper plate 10, realizing automatic switching of the pulse current flowing into the rolling mill position, and ensuring that the current flows into the strip material inlet side during forward and reverse rolling.

[0024] Meanwhile, the second conductive copper plate 8 is composed of two plates, which are connected with the positive pole of the pulse power supply and the first side conductive roller of the rolling mill through wires respectively; the third conductive copper plate 10 is connected with the second side conductive roller of the rolling mill through wires; the first conductive copper plate 7 is directly connected with the positive pole of the pulse power supply through wires, which constitutes the core channel of current switching, and the contact surfaces of each group of conductive copper plates are polished, and the surface roughness Ra is less than or equal to 0.8 μm.

[0025] In the embodiment, the boss 9, the bolt and the nut are made of 304 stainless steel, the first conductive copper plate 7, the second conductive copper plate 8, the third conductive copper plate 10, the support plate 6, the cylinder bottom plate 3 and the fixed plate 4 are made of brass; the insulating gasket is made of polytetrafluoroethylene, and is arranged at the connection positions of the fixed plate 4, the stud 5 and the bottom plate 3.

[0026] The embodiment further comprises a control system, which comprises an air compressor / hydraulic machine, an air source processor and a hand valve, the output pressure adjustment range is 0.4-0.8 Mpa, and the surface pressure between the conductive copper plates is ensured; the hand valve can switch between manual and electric control modes, and is connected with the rolling mill PLC control system signal in the electric mode.

[0027] In the embodiment, the push rod stroke of the telescopic cylinder 1 is controlled by a mechanical limiting block and a position sensor, the position sensor feeds back the push rod position to the control unit in real time, the completion time of the reversing process is 1-2 seconds, and the high-frequency reversible rolling is adapted.

[0028] Embodiment two The embodiment provides a current automatic reversing method for reversible electric plastic rolling, taking an air cylinder as an example, and comprising the following steps: As shown in Figure 2 the forward rolling current control: S1, initial state setting: the PLC sends a command to the air pressure system to drive the air cylinder push rod to descend to the lower stroke end, and the first conductive copper plate 7 on the lower surface of the support plate 6 is in close contact with the second conductive copper plate 8.

[0029] S2. Parameter settings: PLC sets the rolling parameters: rolling force 100KN, rolling speed 0.5m / s, coiler tension 5KN; pulse power supply settings: output voltage 100V, current frequency 50Hz, pulse width 100μs.

[0030] S3. Current path establishment: Start the pulse power supply. The current flows from the positive terminal of the pulse power supply → the first conductive copper plate 7 → the second conductive copper plate 8 → the left conductive roller → the magnesium alloy strip → the work roller → the negative terminal of the pulse power supply.

[0031] S4. Forward rolling operation: Start the rolling mill and coiler. The coiler gradually builds up a tension of 5KN. The strip enters the rolling mill from the inlet side and completes the first rolling pass under the action of electroplastic effect. The rolling time is about 20 seconds.

[0032] like Figure 3 As shown, reverse rolling current control: S5. Reversal Trigger: When the laser thickness gauge on the mill exit side detects that the strip thickness has reached the standard, it sends a pass completion signal to the PLC. The PLC controls the mill to decelerate to a stop within 1 second, and the coiler tension drops to 1KN to prevent the strip from loosening.

[0033] S6. Push rod action: The PLC sends a reversing command, the electric hand valve switches the air circuit, the pneumatic cylinder push rod rises, the position sensor provides real-time feedback on the position, when the push rod rises to the end of the upper stroke, the PLC controls the push rod to stop, at this time the first conductive copper plate 7 and the third conductive copper plate 10 on the upper surface of the support plate 6 are tightly attached.

[0034] S7. Reverse current path establishment: The pulse power supply continues to operate, and the current flows from the positive terminal of the pulse power supply → the first conductive copper plate 7 → the third conductive copper plate 10 → the right conductive roller → the magnesium alloy strip → the work roller → the negative terminal of the pulse power supply.

[0035] S8. Reverse rolling operation: The PLC adjusts the rolling parameters: rolling force 110KN, the mill reverses, the coiler reverses to establish a tension of 5KN, the strip enters the mill from the original exit side, and the second rolling pass is completed. The rolling time is about 18 seconds.

[0036] Repeat the above steps to complete the subsequent rolling process.

[0037] In the above embodiment, the application provides a current automatic reversing device and method for reversible electroplastic rolling. The application realizes 1-2 seconds of fast reversing through telescopic cylinder driving and position sensor positioning. The application ensures complete synchronization of current reversing and rolling mill reversing through PLC and multi-system signal interaction. The application defines the step flow of forward / reverse rolling, and formulates parameter adaptation schemes for magnesium alloy, titanium alloy and zinc alloy respectively, to avoid the randomness of manual adjustment. The application eliminates the lifting roll and rewinding operation, avoids strip damage through micro tension control, shortens the non-rolling time, and improves the equipment utilization.

[0038] The above-described embodiments are merely preferred embodiments of the application, and are not intended to limit the concept and scope of the application. Various modifications and improvements to the technical solutions of the application made by those of ordinary skill in the art without departing from the design concept of the application shall fall within the protection scope of the application. The technical content claimed by the application has been fully recorded in the claims.

Claims

1. A current automatic commutation device for reversible electroplastic rolling, characterized in that: The device comprises a driving assembly, a supporting and fixing assembly, a conductive assembly and an insulation assembly. The driving assembly comprises a telescopic cylinder (1). The supporting and fixing assembly comprises a base (2) at the bottom of the telescopic cylinder (1), a bottom plate (3) at the top of the telescopic cylinder (1) and a fixing plate (4) above the bottom plate (3) and parallel to the bottom plate (3). The fixing plate (4) is located at the end of the upstroke of the push rod of the telescopic cylinder. The bottom plate (3) and the fixing plate (4) are connected by studs (5). The conductive assembly comprises a supporting plate (6) connected to the telescopic rod of the telescopic cylinder and capable of moving up and down. The upper and lower surfaces of the supporting plate (6) are provided with first conductive copper plates (7). The top of the bottom plate (3) is provided with second conductive copper plates (8) matched with the first conductive copper plates (7) by means of bosses (9). The bottom of the fixing plate (4) is provided with third conductive copper plates (10) matched with the first conductive copper plates (7).

2. A current automatic commutation device for reversible electroplastic rolling according to claim 1, characterized in that, The studs (5) are evenly distributed in a ring shape. The fixing plate (4) is provided with a plurality of through holes matched with the plurality of studs (5). The height of the fixing plate (4) is adjusted by double nuts at each through hole.

3. The device for automatic current commutation for reversible electroplastic rolling according to claim 1, characterized in that: The second conductive copper plates (8) are connected to the positive pole of the pulse power supply and the first side conductive roller of the rolling mill by wires respectively. The third conductive copper plates (10) are connected to the second side conductive roller of the rolling mill by wires. The first conductive copper plates (7) are directly connected to the positive pole of the pulse power supply by wires.

4. The device for automatic current commutation for reversible electroplastic rolling according to claim 1, characterized in that: The device further comprises a control system comprising an air compressor / hydraulic machine connected to the telescopic cylinder (1), an air source processor and a hand valve. The hand valve can switch between manual and electric control modes. In the electric control mode, the hand valve is connected to the PLC control system of the rolling mill.

5. The device for automatic current commutation for reversible electroplastic rolling according to claim 1, characterized in that: The bosses (9) are made of 304 stainless steel. The first conductive copper plates (7), the second conductive copper plates (8), the third conductive copper plates (10), the supporting plate (6), the bottom plate (3) and the fixing plate (4) are made of brass.

6. The device for automatic current commutation for reversible electroplastic rolling according to claim 1, characterized in that: The telescopic cylinder (1) is a hydraulic cylinder or an air cylinder.

7. The device for automatic current commutation for reversible electroplastic rolling according to claim 1, characterized in that: The insulation assembly is an insulation gasket arranged at the connection between the fixing plate (4) and the studs (5) and between the studs (5) and the bottom plate (3).

8. A method for automatic current commutation for reversible electioplastic rolling, characterized in that, The reversing device of claims 1-7 comprises the following steps: S1. Control the push rod of the telescopic cylinder (1) to be at the end of the downstroke, so that the first conductive copper plates (7) on the lower surface of the supporting plate (6) are in close contact with the second conductive copper plates (8) of the bosses (9). S2. Set the rolling parameters including rolling force and rolling speed by the PLC of the rolling mill, and set the output voltage, current frequency and pulse width by the pulse power supply. S3. Start the pulse power supply. The current forms a path through the positive pole of the pulse power supply→ the first conductive copper plates (7)→ the second conductive copper plates (8)→ the first side conductive roller of the rolling mill→ the strip→ the work roller→ the negative pole of the pulse power supply. S4. Start the rolling mill and the coiling machine. The coiling machine establishes a set tension. The strip completes the forward rolling pass under the effect of the electroplastic effect. S5. The rolling sensor detects the completion of the forward rolling pass, sends a signal to the PLC, and the PLC controls the rolling mill to slow down and stop. The coiling machine maintains a slight tension. S6, PLC trigger control system switches gas / oil circuit, drives the push rod of telescopic cylinder (1) to rise to the end of stroke, so that the first conductive copper plate (7) on the upper surface of support plate (6) contacts with the third conductive copper plate (10); S7, pulse power keeps running, and the current is switched to pulse power positive electrode→first conductive copper plate (7)→third conductive copper plate (10)→second side conductive roller of rolling mill→strip→work roller→pulse power negative electrode; S8, PLC controls the reverse of rolling mill, adjusts the rolling force parameter, and the coiler reversely establishes tension, so that the strip completes reverse rolling pass.

9. The current automatic commutation method for reversible electroplastic rolling according to claim 8, further comprising a parameter adaptation step: adjusting the rolling force, the pulse power voltage and the control system output pressure for different difficult-to-deform metals; wherein, The rolling force of magnesium alloy is set to 90-110KN, and the voltage is 80-100V. The rolling force of titanium alloy is set to 120-140KN, and the voltage is 100-120V. The rolling force of zinc alloy is set to 70-90KN, and the voltage is 60-80V.

Images