CN108759659B - Control system for paint sheet metal part scraper testing platform - Google Patents
Control system for paint sheet metal part scraper testing platform Download PDFInfo
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- CN108759659B CN108759659B CN201810572933.6A CN201810572933A CN108759659B CN 108759659 B CN108759659 B CN 108759659B CN 201810572933 A CN201810572933 A CN 201810572933A CN 108759659 B CN108759659 B CN 108759659B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/34—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring roughness or irregularity of surfaces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
Abstract
The invention discloses a control system of a scraper testing platform of a paint sheet metal part, which comprises a pressure sensor and a control circuit, wherein the pressure sensor is connected with the control circuit; the pressure sensor is a film sensor and has 7 groups of resistance output signals; the input end of the 7 groups of comparison amplifying circuit modules is connected with the output signals of the 7 groups of resistors, and the output end of the comparison amplifying circuit modules is connected with the input end of the singlechip module; the output end of the RS485 receiving and transmitting module is connected with the input end of the three-channel digital isolator module, and the output end of the three-channel digital isolator module is connected with the input end of the single chip microcomputer module; the output end of the singlechip module is connected with the input end of the driving adjusting circuit module; the output end of the driving adjusting circuit module is connected with a scraper motor of the paint sheet metal part. The invention ensures that the scraper tested by the platform is used for the ash-scraping and mud-scraping process flow of large-area painted sheet metal parts, can greatly improve the flatness of the large-area painted sheet metal parts and improve the working efficiency.
Description
Technical Field
The invention relates to a control system of a paint sheet metal part scraper testing platform.
Background
The repair process of the large-area painted sheet metal part mainly comprises the correction of lines, planes and cambered surfaces, and comprises the following steps: filling gaps, polishing shells, spraying paint, baking, waxing, polishing and the like. Wherein the correction of flatness is the most critical step.
The traditional paint sheet metal part repairing process is simple, basically operated by manpower and experience. In the repair process of sheet metal parts, the biggest problem is the flatness correction of the painted sheet metal parts, the poor flatness can lead to the thickness consistency of the paint to be difficult to control, so that the color is uneven and the outline is changed, and the key for guaranteeing the paint process quality is to solve the problem.
The detection method of the prior common paint sheet metal part scraper mainly comprises the following steps: the manual adjustment type and the simple clamp type. The manual adjustment type is that the angle and the flatness of the paint scraper are observed manually, the stress condition of the paint scraper is sensed, the effect of the paint scraper is judged through scraping operation, and if the angle and the flatness of the paint scraper cannot be adjusted manually, the requirements of the paint batching and mud scraping process are met. The method is simple, rough, poor in stability and difficult to control. The other type is a simple clamp type, which ensures the stress balance between the whole paint surface and the scraper blade by manufacturing a simple clamp, and is generally completed by a mechanical mechanism. The method is complicated, the clamp needs to be readjusted before painting each time, the operation is troublesome, and the working efficiency is low.
Disclosure of Invention
The invention aims to provide a platform control system for testing the flatness of a large-area paint sheet metal part scraper.
The technical scheme for realizing the aim of the invention is that the paint sheet metal part scraper testing platform control system comprises a pressure sensor and a control circuit; the pressure sensor is a thin film sensor and has 7 groups of resistance output signals; the control circuit comprises a single chip microcomputer module, 7 groups of comparison and amplification circuit modules, a three-channel digital isolator module, an RS485 receiving and transmitting module, a driving adjustment circuit module and a voltage-stabilized power supply module for supplying power to the circuit modules; the input ends of the 7 groups of comparison amplifying circuit modules are connected with 7 groups of resistance output signals, and the output ends of the 7 groups of comparison amplifying circuit modules are connected with the input end of the single chip microcomputer module; the output end of the RS485 receiving and transmitting module is connected with the input end of the three-channel digital isolator module, and the output end of the three-channel digital isolator module is connected with the input end of the single chip microcomputer module; the output end of the singlechip module is connected with the input end of the driving adjusting circuit module; the output end of the driving adjusting circuit module is connected with a scraper motor of the paint sheet metal part.
The single chip microcomputer module adopts a single chip microcomputer with the model of STM8L 151.
Each group of circuits of the 7 groups of comparison and amplification circuit modules comprises 5 stages of amplifiers, wherein the first stage of amplifier adopts a double-path high-speed JFET input operational amplifier with the model number of TLE2084, and the second stage to the fifth stage adopt a junction field effect transistor input operational amplifier with the model number of TL 084; the 7 groups of comparison and amplification circuit modules respectively convert the input 7 paths of resistance values into corresponding voltage signals and send the voltage signals to the single chip microcomputer module for analog-to-digital conversion processing.
The model of the three-channel digital isolator is ADUM1301 ARWZ; the model of the RS485 transceiver module is SN65LBC 184D.
The drive adjusting circuit module comprises a drive circuit and two relay circuits; the driving circuit adopts eight NPN Darlington connected transistor array series with the model number of ULN 2803; the two relay circuits are used for positive rotation all the way and reverse rotation all the way and are externally connected with a scraper motor of the painted sheet metal part.
The regulated power supply module comprises a regulated power supply with the model of RT9167, and converts external 5V direct current into 3.3V voltage for output.
The film inductor comprises a PET substrate single-sided adhesive, an upper circuit PET substrate layer, a high-resistance carbon film layer, an anisotropic conductive adhesive film layer, a PET substrate double-sided adhesive, an insulating protection film layer, a high-conductivity silver film layer and a lower circuit PET substrate layer from top to bottom in sequence; the high-conductivity silver film layer is printed with silver line patterns, the silver line patterns are divided into two parallel detection areas, each detection area is provided with 7 consistent patterns serving as stress detection areas in the horizontal direction, the silver line pattern of one detection area is formed by thin lines, and the silver line pattern of the other detection area is formed by thick lines.
The silver line pattern on the high-conductivity silver film layer comprises 7 downlink branch lines which are uniformly distributed along the horizontal direction, 7 uplink branch lines which are uniformly distributed along the horizontal direction, a main lead and 7 single leads; each downlink branch line and each uplink branch line are mutually held, the thin line part forms a rough detection area, and the thick line part forms a fine detection area.
Each downlink branch line comprises two parallel downlink thin lines, two parallel downlink thick lines and a downlink connecting line which connects the two downlink thin lines and the two downlink thick lines together; each uplink branch line comprises two parallel uplink thin lines, two parallel uplink thick lines and an uplink connecting line which connects the two uplink thin lines and the two uplink thick lines together; the main lead connects the descending thin lines of 7 descending branch lines in series; each single lead is connected with an ascending thick wire of an ascending branch line.
And the total lead and 7 single leads are led out through the flat cable port and are connected to the thin film inductor interface after being led out, and the thin film inductor interface is connected with the 7 groups of comparison amplifying circuit modules.
After the technical scheme is adopted, the invention has the following positive effects: (1) the thin film sensor is used as a pressure sensor assembly of the paint sheet metal part scraper testing platform, and is matched with a high-precision control circuit, so that the ash-batching and mud-scraping process flow of the scraper tested by the platform for large-area paint sheet metal parts is ensured, the flatness of the large-area paint sheet metal parts can be greatly improved, and the working efficiency is improved.
(2) The invention can simulate and test the stress condition of the paint sheet metal part scraper in the working process, analyze the stress trend of the paint sheet metal part scraper, adjust the angle of the paint scraper according to the stress condition and meet the requirements of the automatic paint coating process. A group of corresponding resistance values in two areas on a test platform are acquired through a single chip microcomputer, wherein one area corresponds to a part with large output resistance change and is used for rough test (correction state), and the other area corresponds to a part with small output resistance change and is used for fine test (actual measurement state). Each area is distributed with 7 stress points on a horizontal line, and when the paint scraper exerts force in the vertical direction, the corresponding stress point can output a resistance value proportional to the stress condition of the point. Therefore, the voltage value can be converted into a corresponding voltage value, the voltage value is amplified and compared, and the angle of the paint scraper is changed by controlling the actuating mechanism through the single chip microcomputer so as to meet the requirement of the automatic paint coating process on the deviation angle of the scraper.
(3) The invention is provided with a high-performance control circuit, so that the intelligent control circuit has an intelligent function. The resistance value of the corresponding stress point on the film sensor on the test platform collected by the single chip microcomputer is converted into a corresponding voltage value, the voltage value is amplified and compared, and the single chip microcomputer controls the actuating mechanism to change the angle of the paint scraper so as to correct the offset angle of the paint scraper; and the display can be carried out or the communication with an upper computer can be carried out through a serial port.
(4) The high-conductivity silver film disclosed by the invention can be contacted with the anisotropic conductive adhesive film to play a conductive role when stressed on the one hand, and can be used as a shielding layer of a paint scraper testing platform on the other hand, so that the high-conductivity silver film can be prevented from being interfered by various electromagnetic fields in work. The anisotropic conductive adhesive layer can play a role in conducting electricity in the vertical direction, so that the high-resistance carbon film on the upper layer and the high-conductivity silver film on the lower layer form good connection, and the output resistance value of the thin film sensor can be ensured to show a linear change trend along with the magnitude of external applied pressure. The PET substrate single-side adhesive layer can play a role in supporting the film sensor. The high-resistance carbon film plays a conductive role. The double-sided adhesive layer of the PET substrate plays a role in bonding the upper circuit board and the lower circuit board. The insulating protective film is arranged on the thin film inductor and plays the roles of an interlayer and insulation at other places except the high-conductivity silver film area.
(5) The film sensor is used as a pressure sensor of a scraper testing platform of a paint sheet metal part, can effectively reduce the manufacturing and processing cost, is suitable for mass production, and can be applied to the fields of various screen printing, industrial machine tool pressure testing and the like relating to pressure control.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic cross-sectional view of a pressure sensor of the present invention.
FIG. 2 shows a lower layer circuit pattern according to the present invention.
FIG. 3 is a top line drawing of the present invention.
Fig. 4 is a circuit control block diagram of the present invention.
Fig. 5 is a circuit diagram of the single chip microcomputer module of the invention.
Fig. 6 is an amplifying circuit diagram of the present invention.
FIG. 7 is a circuit diagram of a three-channel digital isolator according to the present invention.
Fig. 8 is a circuit diagram of an RS485 transceiver module according to the present invention.
Fig. 9 is a driving adjustment circuit diagram of the present invention.
FIG. 10 is a diagram of a 3.3V regulator circuit according to the present invention.
FIG. 11 is a diagram of a 12V regulator circuit according to the present invention.
The reference numbers in the drawings are as follows:
the circuit board comprises an upper circuit PET substrate layer 1, a high-resistance carbon film layer 2, an anisotropic conductive adhesive film layer 3, a PET substrate single-sided adhesive 4, a lower circuit PET substrate layer 5, a high-conductivity silver film layer 6, a silver line pattern 600, a downlink branch line 610, a downlink thin line 611, a downlink thick line 612, a downlink connecting line 613, an uplink branch line 620, an uplink thin line 621, an uplink thick line 622, an uplink connecting line 623, a main lead 630, a single lead 640, a flat cable port 650, an insulating protective film layer 7, a PET substrate double-sided adhesive 8, a blue upper protective film 9 and a blue lower protective film 10.
Detailed Description
(example 1)
The control system of the paint sheet metal part scraper testing platform comprises a pressure sensor and a control circuit.
The pressure sensor is a thin film sensor, and is schematically shown in fig. 1 in a cross-sectional view, which is not to scale the thickness of each layer for ease of understanding. The film inductor comprises a PET substrate single-sided adhesive 4, an upper circuit PET substrate layer 1, a high-resistance carbon film layer 2, an anisotropic conductive adhesive film layer 3, a blue upper protective film 9, a PET substrate double-sided adhesive 8, a blue lower protective film 10, an insulating protective film layer 7, a high-conductivity silver film layer 6 and a lower circuit PET substrate layer 5 from top to bottom in sequence. The upper circuit layer is composed of an upper circuit PET substrate layer 1, a high-resistance carbon film layer 2 and an anisotropic conductive adhesive film layer 3; the insulating protective film layer 7, the high-conductivity silver film layer 6 and the lower circuit PET substrate layer 5 form a lower circuit layer; and positioning holes with the diameter of 2mm are arranged on the upper circuit layer and the lower circuit layer. The thickness of the PET substrate single-sided adhesive 4 is 0.3 mm; the thickness of the upper circuit PET substrate layer 1 is 0.1 mm; the thickness of the high-resistance carbon film layer 2 is 8-10 um; the thickness of the anisotropic conductive film layer 3 is 5-7 um; the thickness of the PET substrate double faced adhesive tape 8 is 0.23 mm; the thickness of the insulating protective film layer 7 is 8-10 um; the thickness of the high-conductivity silver film layer 6 is 5-7 um; the thickness of the lower circuit PET substrate layer 5 is 0.125 mm.
The high-resistance carbon film layer 2 is screen-printed by using 100-200 g of high-resistance carbon paste with the solid content of 45-55%, the solid content of 3.6K omega/sq @ 8-12 um, the density of 1.33kg/L and the viscosity of 3800-6200 mPa.s; the anisotropic conductive adhesive film layer 3 is made of 100-200 g of anisotropic conductive adhesive conducting in the Z-axis direction, and the anisotropic conductive adhesive has the solid content density of 1.18kg/L and the viscosity of 3200-5500 mPa.s. The high-conductivity silver film layer 6 is subjected to screen printing by using 100-200 g of silver paste with the solid content of 59%, the density of 1.84kg/L and the viscosity of 4600-7400 mPa.s; the insulating protective film layer 7 is made of insulating ink with the surface resistivity of more than 2 multiplied by 10^9ohms/sq @25um, the breakdown voltage of more than 1500V (AC) @25um and the viscosity of 17500mPa.s @20 ℃ for silk-screen printing operation.
Referring to fig. 2, a silver line pattern is printed on the highly conductive silver film layer 6, the silver line pattern is divided into two parallel detection areas, each detection area has 7 identical patterns as force detection areas in the horizontal direction, the silver line pattern of the detection area located at the upper part in fig. 1 is formed by thin lines, and the silver line pattern of the detection area located at the lower part is formed by thick lines. The silver line pattern 600 on the high-conductivity silver film layer 6 comprises 7 downlink branch lines 610 uniformly distributed along the horizontal direction, 7 uplink branch lines 620 uniformly distributed along the horizontal direction, a main lead 630 and 7 single leads 640; each of the downlink branch lines 610 and each of the uplink branch lines 620 are held by each other, and a thin line portion constitutes a rough detection region and a thick line portion constitutes a fine detection region. Specifically, each downward branch 610 includes two parallel downward thin lines 611, two parallel downward thick lines 612, and a downward connecting line 613 connecting the two downward thin lines 611 and the two downward thick lines 612 together; each ascending branch line 620 comprises two parallel ascending thin lines 621, two parallel ascending thick lines 622, and an ascending connecting line 623 connecting the two ascending thin lines 621 and the two ascending thick lines 622 together; the two upper fine lines 621 and the two lower fine lines 611 are staggered; the two up thick lines 622 are staggered with the two down thick lines 612. The bus wire 630 connects the downlink thin lines 611 of the 7 downlink branches 610 in series; each single lead 64 connects an upper heavy wire 622 of an upper branch 620. The main lead 630 and 7 single leads 640 are led out through the flat cable port 650 and then connected to a control circuit to output the resistance value. The white portion in fig. 2 is an insulating protective film layer 7.
As shown in fig. 3, the patterns printed on the high-resistance carbon film layer 2 and the anisotropic conductive film layer 3 of the upper circuit layer are the same, and the patterns are divided into two rectangles parallel to each other, which correspond to the rough detection area and the fine detection area of the silver line pattern 600, respectively.
The size of the whole pressure sensor is 290mm multiplied by 90mm, and in the length direction, the silver wire pattern is positioned in the center and two sides are respectively left for 5 mm.
As shown in fig. 4, the control circuit includes a single chip module, 7 sets of comparison and amplification circuit modules, a three-channel digital isolator module, an RS485 transceiver module, a driving adjustment circuit module, and a voltage-stabilized power supply module for supplying power to the circuit modules; the input end of the 7 groups of comparison amplifying circuit modules is connected with the output signals of the 7 groups of resistors, and the output end of the comparison amplifying circuit modules is connected with the input end of the singlechip module; the output end of the RS485 receiving and transmitting module is connected with the input end of the three-channel digital isolator module, and the output end of the three-channel digital isolator module is connected with the input end of the single chip microcomputer module; the output end of the singlechip module is connected with the input end of the driving adjusting circuit module; the output end of the driving adjusting circuit module is connected with a scraper motor of the paint sheet metal part.
As shown in FIG. 5, the single-chip IC1(STM8L151) is the control core of the test platform. The device collects 7 paths of amplified voltage values sent by a thin film sensor, and performs analog-to-digital conversion and comparison in a single chip microcomputer. When the 7-path voltage value is within a set range, the stress of the paint sheet metal part scraper is balanced, and the silk-screen operation can be performed; when the 7-path voltage value exceeds the set range, a control signal is output to drive the actuating mechanism, the angle of the paint sheet metal part scraper is changed, the paint sheet metal part scraper is enabled to be stressed evenly, meanwhile, the external computer/display is used for displaying, and meanwhile, the external buzzer is used for sending out an alarm prompt sound. The alarm circuit is connected with a pin 48 of a singlechip IC1 and consists of a triode N1 (the model is 2N5551) and a buzzer BELL (the model is THDZ-5V). The pin 18 of the singlechip IC1 is externally connected with a programming LED lamp, the pin 19 is externally connected with a working state LED lamp, the pins 3 and 4 are connected with a clock circuit, and the pin 2 is connected with a reset circuit. Pins 6, 5, 46, 43, 42, 41 and 36 of the singlechip IC1 are respectively connected with the output ends of the 7 groups of amplifying and comparing circuits. Pins 44, 45 and 47 of the single chip IC1 are connected to pins 3, 5 and 4 of a three-channel digital isolator IC 5.
The film sensor of the paint sheet metal part scraper testing platform is connected to 7 groups of comparison amplifying circuits through a film sensor interface J1, and a circuit diagram of one group of comparison amplifying circuits is shown in figure 6. Each group of circuits comprises a 5-stage amplifier, a loop is formed by a resistance value accessed through an interface and an input end of the amplifier, and the resistance variable quantity of the input can be converted into a voltage form and amplified by a five-stage amplifier. TLE2082 is a two-way high-speed JFET input operational amplifier, TL084 is a JFET input operational amplifier, and the TLE2082 is used for converting 7 input resistance values into corresponding voltage signals respectively and sending the voltage signals to the single chip microcomputer IC1 for analog-to-digital conversion processing.
The single chip microcomputer module is connected to a computer/display through the three-channel digital isolator and the RS485 receiving and transmitting module and is used for displaying working conditions. The three-channel digital isolator circuit is shown in figure 7, the RS485 transceiver module circuit is shown in figure 8, the three-channel digital isolator IC5 is in the model of ADUM1301ARWZ, the 3, 4 and 5 pins on one side are connected to the corresponding pins of the single chip microcomputer IC1, the 12, 13 and 14 pins on the other side are connected to the 1, 2 and 4 pins of the RS485 transceiver module IC14 (in the model of SN65LBC184D), the 6 and 7 pins of the IC14 are connected with an RS485 interface J2 through current limiting resistors, and the J2 interface is externally connected with a computer/display, can receive the control of an external computer, and can also display the test data and the working state of the paint sheet metal part scraper test platform. The TVs 3 and 4 (model number SMCJ5A) connected to the bus are diodes, which have a great effect on suppressing transient high voltage pulse interference signals. C _12 and CD3 are filter capacitors, R _16 is a current-limiting resistor of an LED, the LED3 is an operation indicator lamp of a 5V power supply, and D3 is a rectifier tube.
The driving adjustment circuit is shown in fig. 9 and comprises an IC6, ULN2003, RLY1 and RLY2, wherein the IC6 model of the driving circuit is ULN2803, which is a series of eight NPN darlington connected transistor arrays for driving the following relay circuit. RLY1, RLY2 are two way relay control circuit, and one way is as corotation, and the other way is as reversal, external motor of adjusting paint sheet metal component scraper blade angle. In the figure, the OUT _ LED19 and the OUT _ LED20 are relay operation indicating lamps, and R74 and R75 are current limiting resistors thereof.
In order to control the circuit to work effectively, 5V, 3.3V, +12V and-12V power supplies are configured, a regulated power supply IC4 is provided, the model is RT9167, and external 5V direct current is converted into 3.3V voltage to be output. The other group is supplied to the operational amplifier by +12V and-12V two groups of voltages fed by J3. CD1, C _13, C _14, C _15 are filter capacitances. R _7 and LED4 are power indicator circuits, and R _15 is a starting resistor. C _16, CD2 are filter capacitors. R _9 and LED6 are power indicator circuits, and D1, D2 are rectifier diodes.
The production process of the pressure sensor of the test platform control system comprises the following steps:
And 3, after the coil stock is cut into pieces, the pieces are laid on a net trolley, and the net trolley frame is pushed into a hot drying oven to be shrunk. The material was baked in a hot oven at 130 ℃ for 25 minutes to dimensionally stabilize the material. And after baking, pushing the net frame out of the oven, and collecting the material to be printed after the temperature of the material is reduced to 25 ℃ at room temperature.
1) the scraper selects a scraping glue with a round angle of 70 degrees R0.2-0.3 mm in Shore hardness, is arranged on a scraper frame of a screen printing machine to form a 75-degree angle with the screen printing plate, the pressure range of each point of the scraper on a printing machine table is 28-30N, the length of the scraper needs to exceed a printed pattern by 25-35 mm, the stroke exceeds the pattern by 30-100 mm, and the distance between the screen printing plate and the machine table for placing materials is 5.0 +/-1.0 mm;
2) selecting 100-200 g of high-resistance carbon paste with solid content of 45-55%, 3.6K omega/sq @ 8-12 um, density of 1.33kg/L and viscosity of 3800-6200 mPa.s, placing the high-resistance carbon paste on the left side of a screen printing plate, placing an upper line PET substrate layer 1 at an appointed position of a screen printing machine table, starting an air suction device to stably suck the upper line PET substrate layer 1, adjusting the pressure (10-15N) of an ink returning cutter pressing on the screen printing plate, adjusting the left and right positions to exceed a printing pattern by 20-50 mm, adjusting the stroke to exceed the pattern by 30-100 mm, uniformly paving the ink in a screen printing plate pattern area, and setting the ink returning speed to be 3 steps;
3) after the machine is adjusted according to the parameters, the high-resistance carbon paste is completely and clearly transferred to the upper circuit PET substrate layer 1 through the hollow patterns on the silk screen;
4) closing the air suction to take down the printed material from the machine table, placing the printed material on a hot drying channel conveyor belt, and performing pre-drying treatment;
5) flatly paving a single material sheet on a net trolley, pushing the net trolley into a hot oven to bake for 30 minutes at 150 ℃ to completely cure the high-resistance carbon slurry, and leaving a high-resistance carbon layer of 8-10 microns on the PET substrate layer 1;
6) and after the baking is finished, pushing the net trolley out of the oven, and collecting the net trolley for later use after the temperature of the material is reduced to 25 ℃ at room temperature.
1) the scraper selects a scraping glue with a round angle of 80 degrees R0.2-0.3 mm in Shore hardness, is arranged on a scraper frame of a screen printing machine to form a 75-degree angle with the screen printing plate, the pressure range of each point of the scraper on a printing machine table is 30-34N, the length of the scraper needs to exceed a printed pattern by 25-35 mm, the stroke exceeds the pattern by 30-100 mm, and the distance between the screen printing plate and the machine table for placing materials is 5.0 +/-1.0 mm;
2) selecting 100-200 g of anisotropic conductive adhesive conducting electricity in the Z-axis direction, placing the anisotropic conductive adhesive with the solid content density of 1.18kg/L and the viscosity of 3200-5500 mPa.s on the left side of a screen printing plate, placing a material to be printed at a specified position of a screen printing machine table, starting an air suction device to stably suck the material, adjusting the pressure (10-15N) of a return knife pressing on the screen printing plate, enabling the left and right sides of the return knife to exceed a printed pattern by 20-50 mm, enabling the stroke to exceed the pattern by 30-100 mm, uniformly paving the ink in a screen printing plate pattern area, and setting the ink return speed to be 3 grades;
3) after the machine is adjusted according to the parameters, the anisotropic conductive adhesive can be completely and clearly transferred to the high-resistance carbon film layer 2 through the hollow patterns on the silk screen;
4) closing the air suction to take down the printed material from the machine table, placing the printed material on a hot drying channel conveyor belt, and performing pre-drying treatment;
5) flatly paving a single piece of material on a net trolley, pushing the net trolley into a hot oven to bake for 25 minutes at 130 ℃ to completely cure the anisotropic conductive adhesive, and leaving a layer of 6-8 um anisotropic conductive adhesive layer on the material;
6) and (4) after baking, pushing the net trolley out of the oven, collecting the net trolley for later use after the temperature of the material is reduced to 25 ℃ at room temperature, respectively testing the areas covered and uncovered with the carbon paste by using a universal meter, and determining whether the electric conduction is only carried out in the Z-axis direction.
Thereby obtaining an upper wiring layer.
1) the scraper selects a scraping glue with a round angle of 70 degrees R0.2-0.3 mm in Shore hardness, and is arranged on a scraper frame of a screen printing machine to form a 70-degree angle with a screen printing plate, and the distance between the screen printing plate and a machine table for placing materials is 4.0 mm;
2) selecting 100-200 g of silver paste with the solid content of 59%, the density of 1.84kg/L and the viscosity of 4600-7400 mPa.s on the left side of a screen printing plate, placing the lower circuit PET substrate layer 5 at an appointed position of a screen printing machine table, starting an air suction device to stably suck the material, adjusting the pressure and the stroke of an ink return knife until the silver paste can be uniformly spread in a screen printing plate pattern area, and setting the ink return speed to be 3 grades;
3) adjusting the pressure and the stroke of the ink returning knife until the silver paste can pass through the hollow pattern on the silk screen and be completely and clearly transferred onto the lower circuit PET substrate layer 5;
4) closing the air suction device, taking down the printed material from the machine table, placing the printed material on a hot drying channel conveyor belt, and performing pre-drying treatment;
5) flatly paving a single piece of material on a net trolley, pushing the net trolley into a hot oven to bake for 30 minutes at 140 ℃ so as to completely solidify the silver paste, and leaving a layer of 5-7um silver wires on the material; the black line portion in fig. 2.
6) And after the baking is finished, pushing the net trolley out of the oven, and collecting the net trolley for later use after the temperature of the material is reduced to 25 ℃ at room temperature.
setting printing parameters according to the process steps specified in the step 6, selecting insulating ink with the surface resistivity of more than 2 multiplied by 10^9ohms/sq @25um, the breakdown voltage of more than 1500V (AC) @25um and the viscosity of 17500mPa.s @20 ℃ for silk-screen printing operation, curing the ink through a UV (ultraviolet) light machine after printing, wherein the thickness of the cured insulating layer reaches 8-10 um. The portions not covered with black lines in fig. 2.
Thereby obtaining the lower wiring layer.
And 8, covering the printing surfaces of the upper and lower circuit layers with blue protective films to prevent the printing layers from being scratched and damaged.
And 9, punching 2mm positioning holes in the CNC punching machine on the upper circuit layer and the lower circuit layer.
And step 10, attaching a PET substrate single-sided adhesive 4 with the thickness of 0.3mm to the non-printing surface of the upper circuit layer to improve the flatness and the bending resistance of the upper circuit layer.
and step 12, positioning the upper circuit layer by using positioning holes, and punching the fabrication holes on a 25-ton punch press.
And step 13, aligning the upper circuit layer and the lower circuit layer by using positioning holes, and bonding the upper circuit layer and the lower circuit layer together by using a 0.23mm PET substrate double-sided adhesive tape 8.
And 14, positioning a positioning hole on the lower circuit, and punching the shape of the film sensor on a 25-ton punch press.
And step 15, assembling connector plastic shells with the distance of 1.5mm on the outside.
The test applies pressure over an effective area of 280mm + -0.3 mm × 3mm + -0.2 mm, and the data obtained are as follows:
the obtained data reflects the trend that the resistance changes in a linear change area along with the change of the applied pressure, so that the method can be used for accurately measuring the pressure change of a paint sheet metal part scraper testing platform.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. Paint sheet metal component scraper blade test platform control system, its characterized in that: comprises a pressure sensor and a control circuit; the pressure sensor is a thin film sensor and has 7 groups of resistance output signals; the control circuit comprises a single chip microcomputer module, 7 groups of comparison and amplification circuit modules, a three-channel digital isolator module, an RS485 receiving and transmitting module, a driving adjustment circuit module and a voltage-stabilized power supply module for supplying power to the circuit modules; the input ends of the 7 groups of comparison amplifying circuit modules are connected with 7 groups of resistance output signals, and the output ends of the 7 groups of comparison amplifying circuit modules are connected with the input end of the single chip microcomputer module; the output end of the RS485 receiving and transmitting module is connected with the input end of the three-channel digital isolator module, and the output end of the three-channel digital isolator module is connected with the input end of the single chip microcomputer module; the output end of the singlechip module is connected with the input end of the driving adjusting circuit module; the output end of the driving adjusting circuit module is connected with a scraper motor of the paint sheet metal part; the film inductor comprises a PET substrate single-sided adhesive (4), an upper circuit PET substrate layer (1), a high-resistance carbon film layer (2), an anisotropic conductive adhesive film layer (3), a PET substrate double-sided adhesive (8), an insulating protection film layer (7), a high-conductivity silver film layer (6) and a lower circuit PET substrate layer (5) from top to bottom in sequence; the high-conductivity silver film layer (6) is printed with silver line patterns, the silver line patterns are divided into two detection areas which are parallel to each other, each detection area is provided with 7 consistent patterns in the horizontal direction as a stress detection area, the silver line pattern of one detection area is formed by thin lines, and the silver line pattern of the other detection area is formed by thick lines; the silver line pattern (600) on the high-conductivity silver film layer (6) comprises 7 downlink branch lines (610) uniformly distributed along the horizontal direction, 7 uplink branch lines (620) uniformly distributed along the horizontal direction, a main lead (630) and 7 single leads (640); each downlink branch line (610) and each uplink branch line (620) are mutually held, a thin line part forms a rough detection area, and a thick line part forms a fine detection area.
2. The paint sheet metal part scraper testing platform control system of claim 1, characterized in that: the single chip microcomputer module adopts a single chip microcomputer with the model of STM8L 151.
3. The paint sheet metal part scraper testing platform control system of claim 1, characterized in that: each group of circuits of the 7 groups of comparison and amplification circuit modules comprises 5 stages of amplifiers, wherein the first stage of amplifier adopts a double-path high-speed JFET input operational amplifier with the model number of TLE2084, and the second stage to the fifth stage adopt a junction field effect transistor input operational amplifier with the model number of TL 084; the 7 groups of comparison and amplification circuit modules respectively convert the input 7 paths of resistance values into corresponding voltage signals and send the voltage signals to the single chip microcomputer module for analog-to-digital conversion processing.
4. The paint sheet metal part scraper testing platform control system of claim 1, characterized in that: the model of the three-channel digital isolator is ADUM1301 ARWZ; the model of the RS485 transceiver module is SN65LBC 184D.
5. The paint sheet metal part scraper testing platform control system of claim 1, characterized in that: the drive adjusting circuit module comprises a drive circuit and two relay circuits; the driving circuit adopts eight NPN Darlington connected transistor array series with the model number of ULN 2803; the two relay circuits are used for positive rotation all the way and reverse rotation all the way and are externally connected with a scraper motor of the painted sheet metal part.
6. The paint sheet metal part scraper testing platform control system of claim 1, characterized in that: the regulated power supply module comprises a regulated power supply with the model of RT9167, and converts external 5V direct current into 3.3V voltage for output.
7. The paint sheet metal part scraper testing platform control system of one of claims 1 to 6, characterized in that: each downlink branch (610) comprises two parallel downlink thin lines (611), two parallel downlink thick lines (612) and a downlink connecting line (613) which connects the two downlink thin lines (611) and the two downlink thick lines (612) together; each uplink branch line (620) comprises two parallel uplink thin lines (621), two parallel uplink thick lines (622) and an uplink connecting line (623) connecting the two uplink thin lines (621) and the two uplink thick lines (622) together; the main lead (630) connects the descending thin lines (611) of the 7 descending branches (610) in series; each single lead (64) is connected with an upward thick wire (622) of an upward branch line (620).
8. The paint sheet metal part scraper testing platform control system of claim 7, characterized in that: the total lead (630) and 7 single leads (640) are led out through a flat cable port (650), and are connected to a thin film inductor interface after being led out, and the thin film inductor interface is connected with the 7 groups of comparison amplifying circuit modules.
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