CN106975664A - A kind of micro- milling method of very thin variable-thickness strip - Google Patents

Abstract

The invention relates to a micro-rolling method for an extremely thin and variable-thickness strip, which solves the problems in the prior art that the operation is complicated, multi-pass rolling is required to achieve the required thickness, and the production efficiency is low. The method includes: first determine the deformation thickness ratio as H ₂ /H ₃ , then determine the roll gap H _gap ; when the rolling speed V has been determined, set the initial rolling roll gap as H ₂ , the required rolling Thick zone length S ₁ and rolling thin zone length S ₂ ; select the rolling direction and rolling control mode, then open the roll gap, put the strip to be rolled on the roll, close the roll gap, and the roll is closed The initial pressure of the roll gap is pressed, and the clamp is pressed against the head part; the rolling mill starts to run and rolls according to the set roll gap amount. This method can realize variable thickness micro-rolling of ultra-thin strips, precisely control the thickness of the thin area, the thickness of the thick area, and the length of the transition area, and complete the adjustment of the roll gap through automatic control; and use the hydraulic pressure system to lift the single The amount of pressing down in each pass realizes one-time forming of variable-thickness rolled pieces.

Description

A micro-rolling method for extremely thin and variable-thickness strip

technical field

The invention belongs to the technical field of strip rolling, and in particular relates to a micro-rolling method for ultra-thin variable-thickness strips with high production efficiency, precise strip thickness variation, simple operation and good controllability.

Background technique

With the rapid development of science and technology, electronic consumer products are also constantly developing in the direction of multi-function, miniaturization, light weight, high density and high reliability. The trend of continuous miniaturization of electronic products has sharply increased the demand for thin and ultra-thin strip parts, resulting in higher requirements for the processing size of parts in the market.

The research on variable thickness strip rolling at home and abroad mainly focuses on the differential thickness plate with a thickness of 0.5-3mm, which is used in the automotive industry, and the LP plate with a thickness of 10-100mm; and the extremely thin plate with a thickness less than 0.3mm The variable thickness micro-rolling of the strip is hardly covered.

The variable-thickness ultra-thin strip can integrate some product parts, avoid welding processes between parts with different thicknesses, and reduce production difficulty. One-time forming of variable thickness rolled parts can greatly improve production efficiency and reduce the amount of raw materials; thus further promoting the development of miniaturization, light weight and high density of electronic products. Because there is no weld seam in the extremely thin tape with variable thickness, the surface quality is high, the structure and performance are uniform, and the length and shape of the thickness transition zone are highly controllable. This type of material is mainly used in the microelectronics industry, as well as in the manufacture of large integrated circuits and micro precision equipment.

At present, the synchronous rolling and asynchronous rolling of ordinary strips, and the variable thickness rolling methods of thick and medium plates have been developed relatively maturely; however, the research on the rolling of extremely thin variable thickness strips is still relatively limited. few. Most of the existing two-roll and four-roll rolling mills have large roll diameters and complex operations, requiring multiple passes of rolling to achieve the required thickness; and the change of thickness cannot be realized, and the production efficiency is very low. Since the current production equipment and rolling methods cannot meet the market demand for variable-thickness ultra-thin strips, it is necessary to improve the existing ultra-thin variable-thickness strip rolling methods.

Contents of the invention

The present invention aims at the above problems and provides a micro-rolling method for extremely thin and variable-thickness strips with high production efficiency, accurate strip thickness variation, simple operation and good controllability.

The technical solution adopted in the present invention is: the micro-rolling method of the extremely thin and variable thickness strip comprises the following steps:

Step 1. Determine the thickness of the rolled strip as H ₁ , the thickness of the rolled thick area H ₂ and the thickness of the rolled thin area H ₃ , and the thickness ratio of the deformed area is H ₂ /H ₃ , and the roll gap H _gap can be determined; that is, the thick area rolled The roll gap is H _gap = H ₂ during rolling, and the roll gap is adjusted to H _gap = H ₃ during thin zone rolling;

Step 2, designing the rolling speed V as required;

Step _3. Design the roll _gap H _gap = H ₂ , the length of the thick zone L ₁ , the length _of the transition zone L ₂ when rolling in the thick zone zone length L ₂ and thin zone length L ₃ ;

Step 4. Turn on the micro two-roll rolling mill for the test, and confirm that the touch screen on the console has been successfully started and has entered the program interface;

Step 5. Enter the variable thickness rolling module, and input the roll gap H _gap =H ₂ , the length of the thick zone L ₁ , the length of the transition zone L ₂ and the rolls for the thin zone rolling designed in steps 2 and 3 Gap H _gap = H ₃ , thin area length L ₃ , rolling speed V, select the rolling direction and rolling control mode; then, open the roll gap, control the servo motor to start through the computer program, and at the same time, start the servo electric cylinder to The upper roll is lifted;

Step 6. Put the strip to be rolled on the lower roll, perform the operation of closing the roll gap, and use the computer program to close the initial pressure of the roll gap, control the hydraulic system, make the rolls press against each other, and clamp the leading part;

Step 7. Start the running switch, the rolling mill starts to run, the automatic control system starts the servo motor through the parameter setting, and the power is input to the reducer through the coupling, and the reducer divides the power into two ways to drive the lower roll through the universal coupling Rotate with the upper roller, start the servo electric cylinder at the same time as the servo motor starts, press according to the set reduction amount, and start rolling the rolling material;

Step 8: During the rolling process, the pressure sensor and the displacement sensor collect the data of the reduction amount and the rolling force, and feed it back to the computer, and the computer processes and outputs the data.

The rolling mill is a multi-functional two-roll precision micro-rolling mill, which can carry out three rolling experiments of pressure rolling, gap rolling and variable thickness rolling, including automatic control cabinet, PLC system, pressing device, transmission device, a pair of work rolls distributed vertically; pre-set relevant rolling parameters in the computer variable thickness rolling module, start the computer control system, start the PLC to enter the automatic control state; the rolling process is: the automatic control system passes the parameters Set to start the servo motor, input the power to the reducer through the coupling, and the reducer divides the power into two paths through the universal coupling to drive the lower roll and the upper roll to rotate. When the servo motor starts, start the servo electric cylinder. Press down according to the set reduction amount, and start rolling the rolling material. During the rolling process, the pressure sensor and displacement sensor collect the data of the reduction amount and rolling force, and feed it back to the computer, which processes and outputs the data; After the rolling process is completed, the physical quantity storage and output data output by the computer are used to analyze the rolling process and evaluate the product.

The device used in the micro-rolling method of extremely thin and variable-thickness strips includes a brake, a servo motor, a stand, a shaft coupling, a reducer, a universal coupling, a lower roll, an upper roll, a frame, a pressure sensor and The displacement sensor and the servo electric cylinder, the brake of which is connected to the servo motor through the coupling, the servo motor is on the base, the servo motor transmits the power to the reducer through the coupling, and the reducer transmits the power respectively through the universal coupling It is transmitted to the lower roll and upper roll to realize asynchronous rolling. The pressure sensor and displacement sensor are installed on the frame to realize the measurement and feedback of rolling force and roll gap. The servo electric cylinder is installed on the top of the precision rolling mill; the servo motor And the servo electric cylinder is controlled by PLC control system to automatically adjust the roll gap, automatically control the rolling speed, and collect real-time data and feed it back to the computer. The computer converts the data into physical quantities to display various data and store the data. For users to call for analysis and print.

During the rolling process, the roll gap when the rolling mill presses against the strip with the initial pressure is the initial roll gap H ₀ , after the rolling process starts, the roll gap is adjusted to H ₂ , and the rolling length is L ₁ ; after that, the roll gap starts to change and transition Zone rolling, the rolling length is L ₂ ; finally the roll gap becomes H ₃ , and the thin zone rolling starts, the rolling length is L ₃ , so far a cycle of rolling process is completed.

Beneficial effects of the present invention: 1. Automatic intelligent control is realized, the operation is convenient, and the work efficiency and rolling accuracy are improved; the application of the servo electric cylinder increases the reaction speed, greatly improves the accuracy of differential thickness control, And it is economical and environmentally friendly. 2. Realize the control of differential thickness, rolling the rolled pieces with different thicknesses in the length and width directions, which provides the possibility for the continuous rolling of variable thickness rolled materials, and cancels the current welding process of variable thickness pieces, saving time and cost, the rolled variable thickness rolling stock has high reliability and mechanical properties. 3. The single-pass reduction capacity is large, and one-time deformation is realized, which effectively improves the production efficiency. 4. Through the pressure sensor and displacement sensor, the rolling situation is monitored in real time, and the operation data can be saved at any time, which is convenient for later data processing.

Description of drawings

Fig. 1 is a kind of structural representation of the two-roll precision micro-rolling mill that implements the method of the present invention to adopt.

Figure 2 is a graph showing roll vertical displacement versus time.

Fig. 3 is a graph showing roll reduction speed versus time.

Description of serial numbers in the figure: 1 Brake, 2 Servo motor, 3 Machine base, 4 Coupling, 5 Reducer, 6 Universal coupling, 7 Lower roll, 8 Upper roll, 9 Rack, 10 Pressure sensor, 11 Displacement Sensors, 12 servo electric cylinders.

detailed description

The specific steps of the present invention will be described in detail according to FIGS. 1 to 3 .

The micro-rolling method of the ultra-thin and variable-thickness strip includes: step ₁ , determining the thickness of the rolled strip as H1, the thickness of the rolled thick zone _H2 and the thickness of the rolled thin zone H3, and the thickness ratio _of the deformed zone is _H2 /H ₃ , the roll gap H _gap can be determined; that is, the roll gap is H _gap = H ₂ when rolling in the thick area, the roll gap is a real-time changing value when rolling in the transition area, and the roll gap is adjusted to H _gap = H when rolling in the thin area ₃ .

Step 2: Design the rolling speed V according to the actual rolling situation.

Step _3. Design the roll _gap H _gap = H ₂ , the length of the thick zone L ₁ , the length _of the transition zone L ₂ when rolling in the thick zone Region length L ₂ and thin region length L ₃ .

Step 4. Connect all the cables on the rolling mill firmly in turn, and then connect to the power supply. Open the micro two-roll rolling mill for the test, open the back door of the control cabinet, turn on all the motor circuit breaker switches (QF) (“OFF” to “ON” state), then turn the PLC power switch to the “I” state, and turn the CPU switch to to the "RUN" state. Confirm that the touch screen on the operating table has been successfully started and has entered the program interface; when the rolling is about to end, turn the "stop-run" switch to the stop position.

Step 5. Enter the variable thickness rolling module, and input the roll gap H _gap =H ₂ , the length of the thick zone L ₁ , the length of the transition zone L ₂ and the rolls for the thin zone rolling designed in steps 2 and 3 Seam H _gap = H ₃ , thin area length L ₃ , rolling speed V, select the rolling direction and rolling control mode; then, open the roll gap, control the servo motor 2 to start through the computer program, and at the same time, start the servo electric cylinder 12 Lift the upper roller 8.

Step 6: Put the strip to be rolled on the lower roller 7, start the "roll gap closing" operation button, at this time, the rollers will press against the initial pressure of the closed roll gap, and clamp the leading part.

Step 7: Turn on the "Run" switch, the rolling mill starts to run, the automatic control system starts the servo motor 2 through the parameter setting, and the power is input to the reducer 5 through the coupling 4, and the reducer 5 divides the power into two ways and passes through the universal direction. Coupling 6 drives lower roller 7 and upper roller 8 to rotate. At the same time when the servo motor 2 is started, the servo electric cylinder 12 is started, and the rolling is carried out according to the set reduction amount, and the rolling is started. During the rolling process, the pressure sensor 10 and the displacement sensor 11 measure the reduction amount and the rolling force. The data is collected and fed back to the computer, and the computer processes and outputs the data.

Step 8. When the rolling is about to end, turn the "stop-run" switch to the stop position; start the "open roll gap" operation, and the roll system will automatically return to the open roll gap position.

At the end of the rolling process, all the transmission devices and the pressing devices will be switched off, the control cabinet will be opened to turn off the PLC power supply, and the motor circuit breaker switch will be turned off.

The rolling mill used is a multi-functional two-roll precision micro-rolling mill, which can carry out three rolling experiments of pressure rolling, gap rolling and variable thickness rolling, including automatic control cabinet, PLC system, pressing device, The transmission device, a pair of work rolls distributed vertically, etc. Preset relevant rolling parameters in the computer variable thickness rolling module, start the computer control system, and start the PLC to enter the automatic control state. The rolling process is: the automatic control system starts the servo motor 2 through the parameter setting, and the power is input to the reducer 5 through the coupling 4, and the reducer 5 divides the power into two ways and drives the lower roll 7 through the universal coupling 6 Rotate with the upper roll 8, start the servo electric cylinder 12 at the same time as the servo motor 2 is started, press down according to the set reduction amount, and start rolling the rolling material. During the rolling process, the pressure sensor 10 and the displacement sensor 11 are pressed. The data collection of drop and rolling force is fed back to the computer, and the computer processes and outputs the data. After the rolling process is completed, the physical quantity storage and output data output by the computer are used to analyze the rolling process and evaluate the product.

The device used in the micro-rolling method of the ultra-thin and variable-thickness strip includes a brake 1, a servo motor 2, a stand 3, a coupling 4, a reducer 5, a universal coupling 6, a lower roll 7, and an upper roll 8 , frame 9, pressure sensor 10, displacement sensor 11 and servo electric cylinder 12, wherein the brake 1 is connected to the servo motor 2 through the coupling 4, the servo motor 2 is on the base 3, and the servo motor 2 is connected through the coupling 4 The power is transmitted to the reducer 5, and the reducer 5 transmits the power to the lower roll 7 and the upper roll 8 respectively through the universal joint 6 to realize asynchronous rolling. A pressure sensor 10 and a displacement sensor 11 are installed on the frame 9 to realize The measurement and feedback of the rolling force and the roll gap, the servo electric cylinder 12 is installed on the top of the precision rolling mill; the servo motor 2 and the servo electric cylinder 12 are controlled by a PLC control system to automatically adjust the roll gap and automatically control the rolling speed , and real-time data collection, feedback to the computer, the computer converts the data into physical quantities to display various data through data processing, and stores the data for users to retrieve, analyze and print.

During the rolling process, the roll gap when the rolling mill presses against the strip with the initial pressure is the initial roll gap H ₀ , after the rolling process starts, the roll gap is adjusted to H ₂ , and the rolling length is L ₁ ; after that, the roll gap starts to change and transition Zone rolling, the rolling length is L ₂ ; finally the roll gap becomes H ₃ , and the thin zone rolling starts, the rolling length is L ₃ , so far a cycle of rolling process is completed.

The present invention will be further described below in conjunction with a specific rolling process.

Embodiment 1: A pure copper strip with a length of 150 mm and a thickness of 0.118 mm was rolled into a thickness of 0.102 mm in the thick zone, a thickness of 0.062 mm in the thin zone, and a length of the transition zone of 4.91 mm.

The specific operation steps are: (1) Connect all the cables on the rolling mill firmly in turn, and then connect to the power supply.

(2) Open the back door of the control cabinet, turn on all the motor circuit breaker switches (QF) (“OFF” to “ON” state), then turn the PLC power switch to the “I” state, and turn the CPU switch to the “RUN” state .

(3) Confirm that the touch screen on the console has been activated successfully and has entered the program interface.

(4) Enter the variable thickness rolling module, input rolling thick zone H ₂ =0.100mm, thick zone length L1=10mm, rolling thin zone H ₃ =0.060mm, thin zone length L ₂ =10mm, transition zone length L ₃ =4.90mm, rolling speed parameter 40cm/min.

(5) Start the rolling mill, the "single-action-linkage" switch to the linkage position, and the "stop-run" switch to the stop position. Select rolling direction and rolling control method (including pressure control and roll gap control).

(6) Open the roll gap, put the pure copper strip on the roll, and activate the "close roll gap" operation button. At this time, the roll will press against the initial pressure of the closed roll gap, and clamp the leading part.

(7) Start the "Run" switch, the rolling mill starts to run and rolls according to the set rolling force or roll gap.

(8) When the rolling is about to end, turn the "stop-run" switch to the stop position. Start the "roll gap opening" operation, and the roll system will automatically return to the position of the roll gap opening.

(9) When the rolling process is over, switch off the transmission device and the pressing device, open the control cabinet and turn off the PLC power supply, and turn off the motor circuit breaker switch.

Embodiment 2: A pure copper strip with a length of 150 mm and a thickness of 0.211 mm is rolled to a thickness of 0.19 mm in a thick zone, a thickness of 0.09 mm in a thin zone, and a length of a transition zone of 6.70 mm.

The specific operation steps are: (1) Connect all the cables on the rolling mill firmly in turn, and then connect to the power supply.

(2) Open the back door of the control cabinet, turn on all the motor circuit breaker switches (QF) (“OFF” to “ON” state), then turn the PLC power switch to the “I” state, and turn the CPU switch to the “RUN” state .

(3) Confirm that the touch screen on the console has been activated successfully and has entered the program interface.

(4) Enter the variable thickness rolling module, input rolling thick zone H ₂ =0.210mm, thick zone length L1=10mm, rolling thin zone H ₃ =0.090mm, thin zone length L ₂ =10mm, transition zone length L ₃ =6.50mm, rolling speed parameter 160cm/min.

(5) Start the rolling mill, the "single-action-linkage" switch to the linkage position, and the "stop-run" switch to the stop position. Select rolling direction and rolling control method (including pressure control and roll gap control).

(6) Open the roll gap, put the pure copper strip on the roll, and activate the "close roll gap" operation button. At this time, the roll will press against the initial pressure of the closed roll gap, and clamp the leading part.

(7) Start the "Run" switch, the rolling mill starts to run and rolls according to the set rolling force or roll gap.

(8) When the rolling is about to end, turn the "stop-run" switch to the stop position. Start the "roll gap opening" operation, and the roll system will automatically return to the position of the roll gap opening.

(9) When the rolling process is over, switch off the transmission device and the pressing device, open the control cabinet and turn off the PLC power supply, and turn off the motor circuit breaker switch.

Embodiment 3: A pure copper thin strip with a length of 150 mm and a thickness of 0.3 mm was rolled into a thickness of 0.278 mm in the thick area, a thickness of 0.091 mm in the thin area, and a length of 6.72 mm in the transition area.

The specific operation steps are as follows: (1) Connect all the cables on the rolling mill firmly in turn, and then connect to the power supply.

(2) Open the back door of the control cabinet, turn on all the motor circuit breaker switches (QF) (“OFF” to “ON” state), then turn the PLC power switch to the “I” state, and turn the CPU switch to the “RUN” state .

(3) Confirm that the touch screen on the console has been activated successfully and has entered the program interface.

(4) Enter the variable thickness rolling module, input rolling thick zone H ₂ =0.280mm, thick zone length L1=10mm, rolling thin zone H ₃ =0.060mm, thin zone length L ₂ =0.090mm, transition zone length L ₃ =6.50mm, rolling speed parameter 200cm/min.

(5) Start the rolling mill, the "single-action-linkage" switch to the linkage position, and the "stop-run" switch to the stop position. Select rolling direction and rolling control method (including pressure control and roll gap control).

(6) Open the roll gap, put the pure copper strip on the roll, and activate the "close roll gap" operation button. At this time, the roll will press against the initial pressure of the closed roll gap, and clamp the leading part.

(7) Start the "Run" switch, the rolling mill starts to run and rolls according to the set rolling force or roll gap.

(8) When the rolling is about to end, turn the "stop-run" switch to the stop position. Start the "roll gap opening" operation, and the roll system will automatically return to the position of the roll gap opening.

(9) When the rolling process is over, switch off the transmission device and the pressing device, open the control cabinet and turn off the PLC power supply, and turn off the motor circuit breaker switch.

Claims (4)

1. a kind of micro-rolling method of extremely thin variable thickness strip, is characterized in that: comprise the steps: Step 1. Determine the thickness of the rolled strip as H ₁ , the thickness of the rolled thick area H ₂ and the thickness of the rolled thin area H ₃ , and the thickness ratio of the deformed area is H ₂ /H ₃ , and the roll gap H _gap can be determined; that is, the thick area rolled The roll gap is H _gap = H ₂ during rolling, and the roll gap is adjusted to H _gap = H ₃ during thin zone rolling; Step 2, designing the rolling speed V as required; Step _3. Design the roll _gap H _gap = H ₂ , the length of the thick zone L ₁ , the length _of the transition zone L ₂ when rolling in the thick zone zone length L ₂ and thin zone length L ₃ ; Step 4. Turn on the micro two-roll rolling mill for the test, and confirm that the touch screen on the console has been successfully started and has entered the program interface; Step 5. Enter the variable thickness rolling module, and input the roll gap H _gap =H ₂ , the length of the thick zone L ₁ , the length of the transition zone L ₂ and the rolls for the thin zone rolling designed in steps 2 and 3 Seam H _gap = H ₃ , thin zone length L ₃ , rolling speed V, select the rolling direction and rolling control mode; then, open the roll gap, control the servo motor (2) to start through the computer program, and at the same time, start the servo The electric cylinder (12) lifts the upper roll (8); Step 6. Put the strip to be rolled on the lower roll (7) and close the roll gap. Use the computer program to close the initial pressure of the roll gap and control the hydraulic system so that the rolls are pressed against each other and clamped. leading part; Step 7. Start the running switch, the rolling mill starts to run, the automatic control system starts the servo motor (2) through the parameter setting, and the power is input to the reducer (5) through the coupling (4), and the reducer (5) transmits the power The lower roll (7) and the upper roll (8) are driven to rotate through the universal coupling (6) in two ways. When the servo motor (2) is started, the servo electric cylinder (12) is started, and the reduction amount is set. Press down and start rolling the rolled material; Step 8: During the rolling process, the pressure sensor (10) and the displacement sensor (11) collect the data of reduction amount and rolling force, and feed it back to the computer, which processes and outputs the data. 2. The micro-rolling method for extremely thin and variable-thickness strip according to claim 1, characterized in that: the rolling mill is a multifunctional two-roll precision micro-rolling mill, capable of pressure rolling, roll gap rolling and variable rolling. Rolling experiment of three modes of thickness rolling, including automatic control cabinet, PLC system, reduction device, transmission device, a pair of vertically distributed work rolls and other parts; pre-set relevant rolling parameters in the computer variable thickness rolling module , start the computer control system, start the PLC to enter the automatic control state; the rolling process is: the automatic control system starts the servo motor (2) through the parameter setting, and the power is input to the reducer (5) through the coupling (4), The reducer (5) divides the power into two paths through the universal coupling (6) to drive the lower roll (7) and the upper roll (8) to rotate. When the servo motor (2) is started, the servo electric cylinder (12) is started , carry out the reduction according to the set reduction amount, start rolling the rolled material, the pressure sensor (10) and the displacement sensor (11) collect the data of the reduction amount and rolling force during the rolling process, and feed back to the computer, the computer Carry out data processing and output; after the rolling process is completed, the physical quantity output by the computer is stored and the output data is used to analyze the rolling process and evaluate the product. 3. The micro-rolling method for ultra-thin and variable-thickness strips according to claim 1, characterized in that: the device used in the micro-rolling method for ultra-thin and variable-thickness strips includes a brake (1), a servo motor (2 ), machine base (3), coupling (4), reducer (5), universal coupling (6), lower roll (7), upper roll (8), frame (9), pressure sensor (10) and the displacement sensor (11) and the servo electric cylinder (12), the brake (1) is connected to the servo motor (2) through the coupling (4), and the servo motor (2) is on the base (3) , the servo motor (2) transmits the power to the reducer (5) through the coupling (4), and the reducer (5) transmits the power to the lower roll (7) and the upper roll respectively through the universal coupling (6) (8) to achieve asynchronous rolling, the pressure sensor (10) and displacement sensor (11) are installed on the frame (9) to realize the measurement and feedback of rolling force and roll gap, and the servo electric cylinder (12) is installed on the precision rolling mill The top of the top; the servo motor (2) and the servo electric cylinder (12) are controlled by a PLC control system to automatically adjust the roll gap, automatically control the rolling speed, and collect real-time data, feed back to the computer, and the computer processes the data. Convert it into physical quantities to display various data and store the data for users to retrieve, analyze and print. 4. The micro-rolling method for extremely thin and variable-thickness strip according to claim 1, characterized in that: in the rolling process, the roll gap when the rolling mill adopts the initial pressure to press against the strip is the initial roll gap H ₀ , and the rolling mill After the rolling process starts, the roll gap is adjusted to H ₂ , and the rolling length is L ₁ ; after that, the roll gap starts to change, and transition zone rolling starts, and the rolling length is L ₂ ; finally, the roll gap changes to H ₃ , and thin zone rolling starts , the rolling length is L ₃ , so far a rolling cycle is completed.