CN112964399B - Full-automatic tester and testing method for contact pressure of metal wire/spring piece of electronic device - Google Patents
Full-automatic tester and testing method for contact pressure of metal wire/spring piece of electronic device Download PDFInfo
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- CN112964399B CN112964399B CN202110364384.5A CN202110364384A CN112964399B CN 112964399 B CN112964399 B CN 112964399B CN 202110364384 A CN202110364384 A CN 202110364384A CN 112964399 B CN112964399 B CN 112964399B
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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
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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
- G01L1/005—Measuring force or stress, in general by electrical means and not provided for in G01L1/06 - G01L1/22
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/08—Testing mechanical properties
- G01M11/081—Testing mechanical properties by using a contact-less detection method, i.e. with a camera
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/022—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by means of tv-camera scanning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/007—Subject matter not provided for in other groups of this subclass by applying a load, e.g. for resistance or wear testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
- G01R31/2896—Testing of IC packages; Test features related to IC packages
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention designs a full-automatic tester and a full-automatic testing method for the contact pressure of metal wires/spring pieces of electronic devices, which automatically and accurately identify the positions of a plurality of metal wires/spring pieces to be tested in the visual field range of a high-definition industrial camera, transmit the position information to upper computer software, control an adjustable object carrying sliding table to accurately move to a pressure testing position, trigger a hook of a programmable digital dynamometer to move downwards to accurately align the positions of the metal wires/spring pieces, automatically hang and pick up the metal wires/spring pieces one by one, return measured data of the dynamometer to the upper computer software, and automatically calculate to obtain the pressure value of a contact point by combining with a pressure calculation algorithm. The invention realizes the automatic test function, and the single measurement time of a single metal wire/spring piece is less than 15 s; the measuring accuracy is high, the accuracy is +/-0.05 gf in the tension range, meanwhile, the maintenance and the installation are convenient, and the overload protection function is realized.
Description
Technical Field
The invention belongs to the field of mechanical property testing of micro components, and particularly relates to a full-automatic tester and a testing method for contact pressure of a metal wire/spring piece of an electronic device.
Background
In the existing electronic products, a group of tiny wires/spring pieces are required to press the metal substrate to conduct two circuits in order to transmit electric signals. The pressing force of the metal wire/spring piece on the metal substrate determines the contact area of the contact and also determines the conductivity and the working performance of the whole electronic product, so that the precise test of the pressing force of the metal wire/spring piece on the metal substrate is particularly important.
The traditional test method is to connect the electronic product in a conducting circuit, and pull the free end of the metal wire/spring leaf fixed in the form of a cantilever beam through the hook of the simple spring force measuring device to make the free end separate from the contact with the metal substrate. When the contact pressure is zero, the conducting circuit is disconnected, a specific tension value is obtained at the moment when the current indicator lamp is extinguished, and the tension value at the moment is the measured pressure value.
However, the existing tensile test method has the following defects: and the calibrated spring is used for testing, so that the testing precision and the stability are insufficient. In the measuring process, the average value needs to be measured for a plurality of times, and the testing efficiency is low. The stretching direction is difficult to keep perpendicular to the metal wire/spring plate during the test process, and the test result has deviation. During testing, the tensile force needs to be manually controlled, and the metal wire/spring piece is easily damaged due to over-tension; meanwhile, the manual control of the tensile force is difficult to ensure that the hooking position of the tension meter is the same every time, so that errors exist in the measurement result, and the actually measured tensile force and the pressure difference formed between the metal wire/spring piece and the metal substrate are difficult to ensure to be within an allowable error range.
The brightness of the indicator light is related to the power supply energy, and the variation range of the tension value is large when the indicator light is turned off in the actual operation process, so that the error of the pressure value of the metal wire/spring piece is judged by adopting a method at the moment when the indicator light is turned off. When a plurality of wires/spring pieces are grouped for testing, data are required to be manually hung, tested, recorded and processed one by one to form a report, so that the testing efficiency is extremely low, and the labor is not favorably liberated.
Disclosure of Invention
The technical problem solved by the invention is as follows: in order to overcome the defects in the prior art, the invention designs a full-automatic tester and a testing method for the contact pressure of a metal wire/spring piece of an electronic device.
The technical scheme of the invention is as follows: the full-automatic tester for the contact pressure of the metal wire/spring piece of the electronic device comprises a PC (personal computer), an adjustable carrying sliding table, an adjusting mechanism, a metal wire/spring piece hanging and measuring point determining mechanism and an experiment monitoring mechanism;
the piece to be tested can move under the action of the adjusting mechanism through the adjustable carrying sliding table and move to a specified position;
the device is characterized in that a metal wire/spring piece is arranged on the to-be-tested part, the middle part of the metal wire/spring piece is contacted with the to-be-tested part to form a pressure stress point, and a hook section lifted by a programmable digital dynamometer is arranged at one end of the metal wire/spring piece;
The metal wire/spring piece hanging point determining mechanism comprises a shooting device and an illuminating device, after a to-be-tested piece is positioned under the shooting device, the illuminating device irradiates the metal wire/spring piece to form a light reflection point, the position of the brightest point captured by the shooting device is the initial position of the light reflection point on the metal wire/spring piece, and the optimal hanging point of the metal wire/spring piece is obtained after coordinate conversion; wherein the included angle between the metal wire/spring piece hook section and the adjacent metal wire/spring piece is alpha, and the included angle between the illuminating lamp and the horizontal plane is pi-alpha;
the experiment monitoring mechanism comprises a control system, a dynamometer, a third slide rail assembly, a first camera and a second camera, wherein the third slide rail assembly is arranged on the control system, and the dynamometer can move back and forth along the Z direction under the driving of the third slide rail assembly; after the metal wire/spring piece determines the optimal hanging measuring point, moving the part right below a hook of the dynamometer under the matching of the three slide rail assemblies, and then starting to perform a test; the dynamometer is used for pulling up the metal wire/spring piece, displaying the tension value in the measuring process in real time and transmitting data to the PC, and the PC automatically calculates to obtain the contact point pressure value; the first camera and the second camera carry out real-time camera monitoring on the state of the lifting process of the metal wire/spring piece.
The further technical scheme of the invention is as follows: the device also comprises a box body and a vibration isolation table, wherein the adjusting mechanism, the metal wire/spring piece hanging measuring point determining mechanism and the experiment monitoring mechanism are positioned in the box body, and the box body and the PC are positioned on the vibration isolation table.
The further technical scheme of the invention is as follows: the device comprises a test piece to be tested, an adjustable object carrying sliding table, a metal wire/spring piece and a metal substrate, wherein the test piece to be tested is fixed on the adjustable object carrying sliding table and is provided with the metal wire/spring piece and the metal substrate; the metal wire/spring piece is divided into a straight line section, a wave section and a hook section, the straight line section is fixedly connected with the metal substrate, the wave trough of the wave section is in contact with a to-be-tested part to form a pressure stress point, and the hook section is a lifting part of the programmable digital dynamometer.
The further technical scheme of the invention is as follows: the metal wire/spring piece hanging measuring point determining mechanism further comprises an observation plate, a through hole is formed in the observation plate and serves as a light through hole, and the axis of the light through hole is overlapped with the axis of a lens of the shooting device; an illuminating lamp is arranged below the observation plate; the shooting device and the observation plate are connected to the inner side wall of the box body in a cantilever beam mode; defining an included angle between the wave section and the hook section as alpha, and defining an included angle between the illuminating device and the horizontal plane as pi-alpha; after the piece to be tested moves to the position below the shooting device through the adjusting mechanism, the lighting device irradiates the metal wire/spring piece to form a light reflection point, the position of the brightest point captured by the shooting device is the initial position of the light reflection point on the metal wire/spring piece, and the optimal hanging point of the metal wire/spring piece is obtained after coordinate conversion.
The further technical scheme of the invention is as follows: the adjusting mechanism is located at the bottom of the box body and comprises a first sliding rail assembly and a second sliding rail assembly, wherein the first sliding rail assembly is located at the bottom of the box body, the second sliding rail assembly is located above the first sliding rail assembly and distributed in a cross mode, the installation direction of sliding rails in the first sliding rail assembly is defined to be the X direction, the installation direction of sliding rails in the second sliding rail assembly is the Y direction, and the direction perpendicular to X, Y is the Z direction.
The further technical scheme of the invention is as follows: the adjustable thing slip table that carries is located the second slide rail set spare, and the adjustable thing slip table that carries can carry out the Y direction through the second slide rail set spare and remove, and first slide rail set spare can drive the second slide rail set spare and carry out the X direction and remove.
The further technical scheme of the invention is as follows: the first sliding rail assembly, the second sliding rail assembly and the third sliding rail assembly respectively comprise a sliding rail and a motor, and the motor converts rotary motion into linear motion through a screw rod.
The further technical scheme of the invention is as follows: the first camera and the second camera are vertically distributed.
The further technical scheme of the invention is as follows: the testing method of the full-automatic tester for the contact pressure of the metal wire/spring piece of the electronic device is characterized by comprising the following steps of:
Step 1: placing a to-be-tested test piece on the adjustable carrying sliding table through a positioning fixture, wherein the height of the test piece in the box body is the sum of the height of the positioning fixture and the height value of the test piece, the height of the positioning fixture is an initial given value, and the position of the box body is fixed; the space coordinate value of the high-definition industrial camera is an initial set value;
step 2: determining an initial position of a piece to be tested, comprising the following sub-steps:
substep 2.1: the method comprises the following steps that a to-be-tested piece is moved to the position below a lens of a high-definition industrial camera through a first sliding rail assembly and a second sliding rail assembly, an illuminating lamp provides illumination, a parallel light source is reflected by a light reflection point on a metal wire/spring piece and vertically enters the high-definition industrial camera through a light through hole, the high-definition industrial camera takes a picture to obtain a picture, and the brightest position on each metal wire/spring piece is captured, namely the initial position of the light reflection point on the metal wire/spring piece;
substep 2.2: converting the position of the brightest point in the photo coordinate system in the last step into the position in the box coordinate system to obtain the initial position of the brightest point;
and step 3: under the control of a PC (personal computer), a piece to be tested is driven to move by a first slide rail assembly and a second slide rail assembly, and the metal wire/spring piece is moved to the position near a hook of the digital dynamometer;
And 4, step 4: and finely adjusting the piece to be tested to enable a hook of the programmable digital dynamometer to be positioned right below one of the metal wire/spring piece hook sections:
and 5: setting a pulling pressure limit value of the programmable digital dynamometer in the PC machine, wherein the limit value is lower than a peak value measurable by the programmable digital dynamometer;
step 6: the test was started and analyzed, comprising the following steps:
substep 6.1: the programmable digital dynamometer is driven to move in the Z direction along the slide rail through the third slide rail component, so that the hook is in contact with the metal wire/spring piece and hooks the optimal hanging measuring point on the metal wire/spring piece, and the hook is pulled up at a constant speed;
substep 6.2: in the process of uniform-speed pulling, programming a digital dynamometer to obtain a plurality of groups of tension displacement data, and obtaining a plurality of tension-displacement points under a tension-displacement coordinate system through the plurality of groups of tension displacement data;
substep 6.3: for the points obtained in step 6.2Real-time calculation, the calculation process is that every new point A is generated 2 Calculate the point and the previous point A 1 The slope of the line segment (at the point at which the programmable digital dynamometer begins to take readings) is recorded as slope K 1 Subsequently, the newly generated point A is calculated 3 And A 2 Slope K of the line segment 2 Comparison of K 1 And K 2 If the difference is less than 10%, the slope is determined not to be mutated, the process is repeated, and a newly generated point A is calculated i+1 And A i Slope K of the line segment i Calculating the newly generated point A i+2 And A i+1 Slope K of the line segment i+1 Comparison K i And K i+1 Until the difference between the slope of a point and the slope of the previous point and the slope of the next point is larger than 10%, marking the point as B, and determining that the slope is suddenly changed at the point B.
And 7: and (3) carrying out the operations of the step (3) to the step (6) on other metal wires/spring pieces, and separating the hook of the programmable digital dynamometer from the metal wires/spring pieces after all the metal wires/spring pieces are tested.
The further technical scheme of the invention is as follows: the slope difference ratio refers to the ratio of the slope difference to the slope of one of a set of adjacent straight line segments having a smaller slope.
Effects of the invention
The invention has the technical effects that: the invention provides a full-automatic tester and a testing method for contact pressure of metal wires/spring leaves of an electronic device, which can automatically and accurately identify the positions of a plurality of metal wires/spring leaves to be tested in the visual field range of a high-definition industrial camera, transmit the position information to upper computer software, control an adjustable object carrying sliding table to accurately move to a pressure testing position, trigger a hook of a programmable digital dynamometer to move downwards to accurately align the positions of the metal wires/spring leaves, automatically hang and pick up the metal wires/spring leaves one by one, return measured data of the dynamometer to the upper computer software, and automatically calculate and obtain a contact point pressure value by combining a pressure calculation algorithm, and has the following specific effects:
(1) The invention has the full-automatic test function of the contact pressure of a plurality of groups of metal wires/spring pieces, and simultaneously has the data display function and the data storage function, measures the tension in real time through the programmable digital dynamometer and displays the tension value, and simultaneously has the function of exporting data to the PC terminal. The programmable digital dynamometer can rapidly and accurately measure the tiny pressure value of a tiny component metal wire/spring piece, wherein the single measurement time of a single metal wire/spring piece is less than 15 s.
(2) According to the invention, the position information of the metal wire/spring piece of the tiny component is acquired by the high-definition industrial camera, the first camera and the second camera perform real-time camera shooting monitoring on the state of the metal wire/spring piece in the lifting process of the programmable digital dynamometer hook, the adjustable carrying sliding table is precisely controlled by the slide rail in the first slide rail assembly and the slide rail in the second slide rail assembly, and further the automatic position movement control is performed on the tiny component, so that the method is simple and convenient to operate, and has a one-key automatic measurement and movement function.
(3) The invention has the functions of emergency stop and overload protection, sets the parameters of the measurement software in the PC, sets the limit value of the measurable pressure and the pull of the programmable digital dynamometer, the limit value is lower than the peak value measurable by the programmable digital dynamometer, prevents the programmable digital dynamometer 9 from overloading, and stops running in time.
(4) The invention has high measurement precision, and the precision in the tension range is +/-0.05 gf;
(5) the invention has high reliability, and the error rate of measurement is lower than 5 percent;
(6) the device is convenient to disassemble and disassemble, and individual parts or electronic components are disassembled and replaced during maintenance and inspection, so that the operation is simple and convenient.
(7) The invention has wide application range and can be also applied to the bonding process test of integrated circuits and semiconductor chips.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a partially enlarged schematic view of a test piece according to the present invention;
FIG. 3 is an enlarged view of a positioning portion at an initial position according to an embodiment of the present invention;
FIG. 4 is a partially enlarged view of a real-time camera monitoring portion for a state of a precise force measurement hook during lifting of a wire/spring plate according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a control box of the programmable digital dynamometer with the outer casing removed
FIG. 6 is a force-displacement curve obtained by the data acquisition software acquiring pressure value data in real time; wherein, the curve AB stage is the stage that the spring wire rises without being separated from the contact with the metal substrate; the curve BC stage is the stage that the spring wire is hooked up and lifted and is separated from the contact with the metal substrate.
Description of reference numerals: 1-a box body; 2-high definition industrial cameras; 3-lighting lamps; 4-test piece; 5, positioning a clamp; 6-adjustable loading sliding table; a 7-X-direction sliding rail; 8, a motor; 9-programmable digital force gauge; 10-a first camera; 11-a second camera; 12-a PC machine; 13-a vibration isolation table; 14-light reflection points on the wire/leaf springs; 15-light through hole; a 16-Y directional slide rail; 17-programmable digital dynamometer control box; 18-Z-direction sliding rails; 19-wire/spring plate and hook contact point; 20-Observation plate.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Referring to fig. 1 to 6, an embodiment of the present invention provides a full-automatic tester for contact brush pressure of an electronic device, including the following specific components: the device comprises a box body, a high-definition industrial camera, a first video camera, a second video camera, a positioning clamp, an adjustable object carrying sliding table, a sliding rail, a motor, a programmable digital dynamometer control box, a PC (personal computer) machine, a shock insulation table, an illuminating lamp and an observation board.
The working principle of the invention is that the positions of a plurality of metal wires/spring pieces to be tested are automatically and accurately identified in the visual field range of a high-definition industrial camera, the position information is transmitted to the upper computer software of a PC (personal computer), after an automatic objective table is controlled to accurately move to a pressure test position, a precise hook is triggered to move downwards to accurately align the positions of the metal wires/spring pieces, the metal wires/spring pieces are automatically hung one by one, the measured data of a programmable digital dynamometer returns to the upper computer software, the function of obtaining the pressure value of a contact point is automatically calculated by combining a pressure calculation algorithm, and a report is automatically generated.
The high-definition industrial camera, the illuminating lamp and the observation plate form a part for acquiring the initial position of the metal wire/spring piece relative to a box body coordinate system; the test piece, the positioning fixture, the adjustable loading sliding table, the sliding rail and the motor form a metal wire/spring piece accurate motion control part; the programmable digital dynamometer, the first camera, the second camera and the PC machine are loaded with a to-be-tested piece to form a data measuring and analyzing part of the metal wire/spring piece in the pressure test.
The programmable digital dynamometer is used for displaying the tension value in the measuring process in real time and exporting data to the PC, and matched upper analysis software is installed in the PC to analyze the data and control the movement of the test piece.
High definition industry camera passes through the cantilever beam and is connected with the box back wallboard, and the logical unthreaded hole board that is connected with box back wallboard in high definition industry camera below, logical unthreaded hole on this board under high definition industry camera's two telecentric mirror heads, this board passes through the connection fillet with the light and is connected, as shown in figure 3. When the initial position of each metal wire/spring piece is determined, a to-be-tested piece is fixed by a positioning clamp and is positioned right below the light through hole, and the position is also set to be 0 position of the whole control system.
In the accurate motion control part of the metal wire/spring piece, a slide rail in the first slide rail component is defined as an X-direction slide rail, and a slide rail in the second slide rail component is defined as a Y-direction slide rail. The X-direction slide rail is connected with the box body bottom plate, and the sliding table on the X-direction slide rail is connected with the Y-direction slide rail through a screw. The adjustable thing slip table of carrying is arranged in Y to the guide rail on, installs positioning fixture on the adjustable thing slip table of carrying, and this positioning fixture fixes the test piece through self clamp force. The rear end of the sliding rail is provided with a motor for providing power, and the motor converts the rotary motion into linear motion through a screw rod. The X-direction slide rail drives the adjustable loading sliding table to move in the X direction in a long distance, and the adjustable loading sliding table is subjected to Y-direction fine adjustment and alignment of the photographic positioning 0 through the Y-direction slide rail.
In the data measuring and analyzing part of the metal wire/spring piece in the pressure test, a programmable digital dynamometer, a first camera and a second camera are connected to a control box of the programmable digital dynamometer, the control box of the programmable digital dynamometer is connected with a rear wall plate of a box body, the first camera and the second camera are arranged below the programmable digital dynamometer, and the first camera and the second camera are vertically distributed as shown in figure 4. A third slide rail assembly is arranged in the programmable digital dynamometer control box, a slide rail in the slide rail assembly is defined as a Z-direction slide rail, a motor for providing power is connected behind the Z-direction slide rail, the programmable digital dynamometer is controlled to move in the Z direction, and the motor for providing power is connected behind the Z-direction slide rail, as shown in fig. 5. When the test is carried out, the to-be-tested piece moves to the position right below the programmable digital dynamometer along with the adjustable object carrying sliding table.
The initial position of the metal wire/spring piece is measured by the high-definition industrial camera, wherein a parallel light source is provided by the illuminating lamp, the installation angle of the illuminating lamp is related to the structure of the metal wire/spring piece, and as shown in figure 2, when the angle of the rear end of the metal wire/spring piece is alpha, the included angle between the illuminating lamp and the horizontal plane is pi-alpha. When the parallel light source irradiates on key characteristic points of the metal wire/spring piece, light rays vertically upwards pass through the light through hole, the brightest point is captured by the high-definition industrial camera, the position of the brightest point is the initial position of a light reflection point on the metal wire/spring piece, and then the position of the metal wire/spring piece on the test piece, which needs to be hung, is obtained; it should be noted that the position is close enough to the contact point of the wire/spring plate and the metal substrate, and is the hanging point which can be reached by the hook and is closest to the contact point, and the tension value measured by hooking the wire/spring plate can more accurately express the pressure value between the wire/spring plate and the metal substrate.
The first camera and the second camera carry out real-time camera monitoring on the process and the state of hooking the metal wire/spring piece by the hook of the programmable digital dynamometer. As shown in FIG. 6, the wire/spring is hooked at a constant speed before the wire/spring is separated from the contact with the metal substrate, i.e. curve A 1 And the B stage and the curve BC stage are formed after the metal wire/spring piece is separated from the metal substrate. In the stage that the metal wire/spring leaf is hooked up and raised and does not come into contact with metal base plate, the distance for raising metal wire/spring leaf is very small, the tension force count value is quickly increased in said stage, the programmable digital dynamometer can obtain a series of force-displacement numerical points, and can make real-time calculation of these obtained points, and its calculation process is that every time a new point A is formed 2 Calculate the point and the previous point A 1 The slope of the line segment (at the point at which the programmable digital dynamometer begins to take readings) is recorded as slope K 1 Subsequently, the newly generated point A is calculated 3 And A 2 Slope K of the line segment 2 Comparison K 1 And K 2 If the difference is less than 10%, the slope is determined not to be mutated, the process is repeated, and a newly generated point A is calculated i+1 And A i Slope K of the line segment i Calculating the newly generated point A i+2 And A i+1 Slope K of the line segment i+1 Comparison K i And K i+1 Until the difference between the slope of a point and the slope of the previous point and the slope of the next point is larger than 10%, marking the point as B, and determining that the slope is suddenly changed at the point B. In the stage where the wire/leaf spring is hooked up and lifted up and is out of contact with the metal substrate, which is the stage after the inflection point appears (the slope has already changed suddenly), the wire/leaf spring stops lifting after rising at a constant speed of about 20 μm, the curve stops generating after slightly lengthening by about 20 μm, and the finally obtained point is denoted as point C, as shown in fig. 6.
The inflection point B is a point at which the slope changes suddenly, and the tension reading of the point is the tension value required at the moment when the metal wire/spring piece is separated from the metal substrate, namely the pressure value determined by the invention when the metal wire/spring piece is separated from the metal substrate.
The testing method based on the device comprises the following steps:
step 1: clamping and positioning a test piece: a test piece to be tested is horizontally placed in a positioning fixture 5 on an adjustable loading sliding table 6 and is fixed by the clamping force of the positioning fixture 5, the Z coordinate of the test piece in a box body 1 is the Z coordinate of the positioning fixture 5 plus the height value of the test piece, the Z coordinate of the positioning fixture 5 is measured at the beginning of the layout design of the test piece, and the Z coordinate is a fixed value in the box body.
Step 2: determining the initial position of the test piece: the test piece is moved to the range below a lens of the high-definition industrial camera 2 through an X-direction slide rail 7 and a Y-direction slide rail 16, the illuminating lamp 3 provides illumination, the parallel light source is reflected by a light reflection point 14 on the metal wire/spring piece and vertically enters the high-definition industrial camera 2 through a light through hole 15, the high-definition industrial camera 2 captures the brightest point position on each metal wire/spring piece, the position is the initial position of the light reflection point 14 on the metal wire/spring piece, the space coordinate of the high-definition industrial camera 2 is measured before a test, the space coordinate in the box body is a certain value, the direction of the high-definition industrial camera 2 is vertically downward, the coordinate range of the shot picture is fixed, and the position of the point to be measured in the picture coordinate system is converted into the XY coordinate in the whole box body 1, so that the initial position of the point to be measured is obtained.
And step 3: moving the test piece to the lower end of the digital dynamometer: the PC 12 automatically analyzes the relative position between the PC and the programmable digital dynamometer 9 according to the initial position information of all the measuring points to be hung, wherein the space coordinate of the programmable digital dynamometer 9 is measured before the test and is a certain value in the box body; the parameters are input into control software, and the X-Y direction position of the test piece 4 is adjusted through the X-direction slide rail 7 and the Y-direction slide rail 16, so that the metal wire/spring piece is arranged near a hook of the programmable digital dynamometer 9, namely the difference between the X-Y coordinates of the metal wire/spring piece and the hook is within 10 mm.
And 4, step 4: finely adjusting the X-Y-Z directions of the piece to be tested under the coordinate system of the piece to be tested so that the hook is arranged right below the metal wire/spring piece: finely adjusting the X-Y position of the piece to be tested under the coordinate system of the piece to be tested according to the new position coordinate obtained in the previous step, so that the distance between the contact point 19 of the metal wire/spring piece and the hook and the X direction of the hook of the programmable digital dynamometer 9 is 5mm, and the Y direction is parallel and level; then the programmable digital dynamometer 9 is moved in the Z direction by the Z-direction slide 18, so that the hook is slightly lower than the contact point 19 of the wire/spring plate and the hook, i.e. the hook is about 32 μm below the contact point 19, and the test piece 4 is fed by the X-direction slide 7, so that the wire/spring plate passes through the hook, i.e. the hook is placed right below the wire/spring plate.
And 5: setting a pulling pressure limit value of measurement software on a PC: the measurement software in the PC 12 is subjected to parameter setting, and a measurable pull pressure limit value of the programmable digital dynamometer 9 is set, which is lower than a measurable peak value of the programmable digital dynamometer 9, so that the programmable digital dynamometer 9 is prevented from being overloaded and stops running in time.
And 6: the wire/leaf was hooked up and the test started: the programmable digital dynamometer 9 slowly ascends at a constant speed through the Z-direction slide rail 18, the hook is in contact with the metal wire/spring piece, the metal wire/spring piece is hooked up, at the moment, the programmable digital dynamometer 9 performs real-time tension measurement to obtain a plurality of force-displacement points, and simultaneously, the force begins to change along with the displacement of the programmable digital dynamometer 9, as shown in fig. 6.
And 7: calculating the points obtained in the step 6 in real time, wherein the calculation process is to generate a new point A every time 2 Calculate the point and the previous point A 1 The slope of the line segment (at the point at which the programmable digital dynamometer begins to take readings) is recorded as slope K 1 Subsequently, the newly generated point A is calculated 3 And A 2 Slope K of the line segment 2 Comparison K 1 And K 2 If the difference is less than 10%, the slope is determined not to be mutated, the process is repeated, and a newly generated point A is calculated i+1 And A i Slope K of the formed line segment i Calculating a newly generated point A i+2 And A i+1 Slope K of the line segment i+1 Comparison K i And K i+1 Until the difference between the slope of a point and the slope of the previous point and the slope of the next point is larger than 10%, marking the point as B, and determining that the slope is suddenly changed at the point B.
The points obtained by the programmable digital dynamometer are calculated in real time, the slope difference value is continuously compared, and finally the point with the slope difference value larger than 10 percent, namely the slope catastrophe point B is obtained, the tension reading of the point is the tension value required at the moment when the metal wire/spring piece is separated from the metal substrate, namely the pressure value when the metal wire/spring piece is separated from the metal substrate.
And 8: returning to the original point: after all the metal wires/spring pieces are sequentially hung and measured, the programmable digital dynamometer 9 slowly descends along with the Z-direction slide rail 18 to enable the hook to be separated from the metal wires/spring pieces, and then the test piece 4 retreats from the position right above the hook along with the X-direction slide rail 7 and returns to the position of '0' at the initial position.
Claims (9)
1. The full-automatic tester for the contact pressure of the metal wire/spring piece of the electronic device is characterized by comprising a PC (personal computer), an adjustable carrying sliding table, an adjusting mechanism, a metal wire/spring piece hanging and measuring point determining mechanism and an experiment monitoring mechanism;
The piece to be tested can move under the action of the adjusting mechanism through the adjustable loading sliding table and move to an appointed position;
the testing device comprises a testing part, a testing part and a hook part, wherein the testing part is provided with a metal wire/spring piece and a metal substrate, the metal wire/spring piece is divided into a straight line section, a wave section and a hook section, the straight line section is fixedly connected with the metal substrate, the wave trough of the wave section is in contact with the testing part to form a pressure stress point, and the hook section is a lifting part of a programmable digital dynamometer;
wherein the middle part of the metal wire/spring piece is contacted with a to-be-tested piece to form a pressure stress point, and one end of the metal wire/spring piece is provided with a hook section lifted by the programmable digital dynamometer;
the metal wire/spring piece hanging point determining mechanism comprises a shooting device and an illuminating device, after a to-be-tested piece is positioned under the shooting device, the illuminating device irradiates the metal wire/spring piece to form a light reflection point, the position of the brightest point captured by the shooting device is the initial position of the light reflection point on the metal wire/spring piece, and the optimal hanging point of the metal wire/spring piece is obtained after coordinate conversion; wherein the included angle between the metal wire/spring piece hook section and the adjacent metal wire/spring piece is alpha, and the included angle between the illuminating lamp and the horizontal plane is pi-alpha;
the experiment monitoring mechanism comprises a control system, a dynamometer, a third slide rail assembly, a first camera and a second camera, wherein the third slide rail assembly is arranged on the control system, and the dynamometer can move back and forth along the Z direction under the driving of the third slide rail assembly; after the metal wire/spring piece determines the optimal hanging measuring point, moving the part right below a hook of the dynamometer under the matching of the three slide rail assemblies, and then starting to perform a test; the dynamometer is used for pulling up the metal wire/spring piece, displaying the tension value in the measuring process in real time and transmitting data to the PC, and the PC automatically calculates to obtain the contact point pressure value; the first camera and the second camera carry out real-time camera monitoring on the state of the lifting process of the metal wire/spring piece.
2. The full-automatic tester for contact pressure of the metal wire/spring plate of the electronic device as claimed in claim 1, further comprising a box body and a vibration isolation table, wherein the adjusting mechanism, the metal wire/spring plate hanging point determining mechanism and the experiment monitoring mechanism are located in the box body, and the box body and the PC are located on the vibration isolation table.
3. The full-automatic tester for contact pressure of the metal wire/spring plate of the electronic device as claimed in claim 1, wherein the metal wire/spring plate hanging point determining mechanism further comprises an observation plate, a through hole is formed on the observation plate as a light through hole, and the axis of the light through hole is coincident with the axis of a lens of a shooting device; an illuminating lamp is arranged below the observation plate; the shooting device and the observation plate are connected to the inner side wall of the box body in a cantilever beam mode; defining an included angle between the wave section and the hook section as alpha, and defining an included angle between the illuminating device and the horizontal plane as pi-alpha; after the piece to be tested moves to the position below the shooting device through the adjusting mechanism, the lighting device irradiates the metal wire/spring piece to form a light reflection point, the position of the brightest point captured by the shooting device is the initial position of the light reflection point on the metal wire/spring piece, and the optimal hanging point of the metal wire/spring piece is obtained after coordinate conversion.
4. The fully automatic tester for contact pressure between a wire/spring plate of an electronic device as claimed in claim 1, wherein the adjusting mechanism is located at the bottom of the case and comprises a first rail assembly and a second rail assembly, wherein the first rail assembly is located at the bottom of the case, the second rail assembly is located above the first rail assembly and distributed in a cross shape, the mounting direction of the rail in the first rail assembly is defined as X direction, the mounting direction of the rail in the second rail assembly is defined as Y direction, and the direction perpendicular to both X, Y is defined as Z direction.
5. The fully automatic tester for contact pressure between a wire/leaf spring of an electronic device according to claim 4, wherein the adjustable object slide is disposed on the second rail assembly, the adjustable object slide is capable of moving in the Y direction via the second rail assembly, and the first rail assembly is capable of driving the second rail assembly to move in the X direction.
6. The fully automatic tester for contact pressure of an electronic device wire/spring plate of claim 4 wherein the first, second and third slide assemblies each comprise a slide and a motor that converts rotational motion to linear motion via a screw.
7. The fully automatic tester of contact pressure of an electronic device wire/leaf spring of claim 1 wherein the first camera and the second camera have lens axes that are vertically spaced.
8. The method for testing the full-automatic tester for the contact pressure of the metal wire/spring piece of the electronic device according to claim 1, comprising the following steps:
step 1: placing a to-be-tested test piece on the adjustable carrying sliding table through a positioning fixture, wherein the height of the test piece in the box body is the sum of the height of the positioning fixture and the height value of the test piece, the height of the positioning fixture is an initial given value, and the position of the box body is fixed; the space coordinate value of the high-definition industrial camera is an initial set value;
step 2: determining an initial position of a piece to be tested, comprising the following sub-steps:
substep 2.1: the method comprises the following steps that a to-be-tested piece is moved to the position below a lens of a high-definition industrial camera through a first sliding rail assembly and a second sliding rail assembly, an illuminating lamp provides illumination, a parallel light source is reflected by a light reflection point on a metal wire/spring piece and vertically enters the high-definition industrial camera through a light through hole, the high-definition industrial camera takes a picture to obtain a picture, and the brightest position on each metal wire/spring piece is captured, namely the initial position of the light reflection point on the metal wire/spring piece;
substep 2.2: converting the position of the brightest point in the photo coordinate system in the last step into the position in the box coordinate system to obtain the initial position of the brightest point;
And 3, step 3: under the control of a PC (personal computer), a piece to be tested is driven to move by a first slide rail assembly and a second slide rail assembly, and the metal wire/spring piece is moved to the position near a hook of the digital dynamometer;
and 4, step 4: and finely adjusting the piece to be tested to enable a hook of the programmable digital dynamometer to be positioned right below one of the metal wire/spring piece hook sections:
and 5: setting a pulling pressure limit value of the programmable digital dynamometer in the PC machine, wherein the limit value is lower than a peak value measurable by the programmable digital dynamometer;
step 6: the test was started and analyzed, comprising the following steps:
substep 6.1: the programmable digital dynamometer is driven to move in the Z direction along the slide rail through the third slide rail component, so that the hook is in contact with the metal wire/spring piece and hooks the optimal hanging measuring point on the metal wire/spring piece, and the hook is pulled up at a constant speed;
substep 6.2: in the process of uniform-speed pulling, programming a digital dynamometer to obtain a plurality of groups of tension displacement data, and obtaining a plurality of tension-displacement points under a tension-displacement coordinate system through the plurality of groups of tension displacement data;
substep 6.3: the points obtained in step 6.2 are calculated in real time, and a new point A is generated every time in the calculation process 2 Calculate the point and the previous point A 1 The slope of the line segment formed, where A 1 For starting to appear on programmable digital ergometersThe point at which the reading took place is noted as the slope K 1 Subsequently, the newly generated point A is calculated 3 And A 2 Slope K of the line segment 2 Comparison K 1 And K 2 If the difference is less than 10%, the slope is determined not to be mutated, the process is repeated, and a newly generated point A is calculated i+1 And A i Slope K of the line segment i Calculating the newly generated point A i+2 And A i+1 Slope K of the line segment i+1 Comparison K i And K i+1 Until the difference between the slope of a certain point and the slope of the previous point and the slope of the next point is more than 10%, marking the point as B, and determining that the slope is mutated at the point B;
and 7: and (5) carrying out the operations of the steps (3) to (6) on other metal wires/spring pieces, and separating the hook of the programmable digital dynamometer from the metal wires/spring pieces after all the metal wires/spring pieces are tested.
9. The method of claim 8 for testing the fully automatic tester of contact pressure of the electronic device wire/spring plate comprises: and the ratio of the slope difference to the slope of one straight line segment with smaller slope in a group of adjacent straight line segments is the slope difference ratio.
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| CN202110364384.5A CN112964399B (en) | 2021-04-05 | 2021-04-05 | Full-automatic tester and testing method for contact pressure of metal wire/spring piece of electronic device |
| GB2109890.0A GB2605658B (en) | 2021-04-05 | 2021-07-08 | A fully automatic tester and test method for testing the contact pressure of metal wires/spring pieces in electronic devices |
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| CN202110364384.5A CN112964399B (en) | 2021-04-05 | 2021-04-05 | Full-automatic tester and testing method for contact pressure of metal wire/spring piece of electronic device |
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| CN114112334B (en) * | 2021-09-18 | 2024-08-09 | 中国航发哈尔滨东安发动机有限公司 | Aviation spring piece simulation assembly elasticity measuring device |
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| Publication number | Publication date |
|---|---|
| GB2605658A (en) | 2022-10-12 |
| CN112964399A (en) | 2021-06-15 |
| GB202109890D0 (en) | 2021-08-25 |
| GB2605658B (en) | 2023-10-25 |
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