CN118067074B - Least square method-based method for judging bending and warping degree of heat radiation plate surface - Google Patents
Least square method-based method for judging bending and warping degree of heat radiation plate surface Download PDFInfo
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- CN118067074B CN118067074B CN202410472266.XA CN202410472266A CN118067074B CN 118067074 B CN118067074 B CN 118067074B CN 202410472266 A CN202410472266 A CN 202410472266A CN 118067074 B CN118067074 B CN 118067074B
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000005452 bending Methods 0.000 title claims abstract description 22
- 230000005855 radiation Effects 0.000 title description 3
- 230000017525 heat dissipation Effects 0.000 claims abstract description 13
- 238000006073 displacement reaction Methods 0.000 claims abstract description 8
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000017105 transposition Effects 0.000 description 1
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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Abstract
The invention relates to the technical field of heat dissipation plates, in particular to a heat dissipation plate surface bending degree judging method based on a least square method. The method comprises the following steps of: fitting a reference plane: respectively measuring coordinate values around the plate surface through a displacement sensor, and fitting a plane equation according to a least square method; calculating the distance d between each measuring point and the fitting reference plane; calculating flatness: and judging whether the bending degree is qualified or not by calculating the difference value between the highest point and the lowest point. The invention has the advantages that: according to the technical scheme, the reference plane of each plate surface is calculated preferentially through the least square method, so that the distances from different points to the reference plane are calculated by taking the reference plane as a standard, qu Qiaodu of the plate surfaces are obtained through the difference between the highest point and the lowest point, and the camber condition of the plate surfaces is judged, and the judgment accuracy of the camber is greatly improved.
Description
Technical Field
The invention relates to the technical field of heat dissipation plates, in particular to a heat dissipation plate surface bending degree judging method based on a least square method.
Background
The radiating fin is a device for radiating the heat-generating electronic element in the power supply, and is mostly made of aluminum alloy, brass or bronze into a plate shape, a sheet shape, a multi-sheet shape and the like, for example, a CPU central processing unit in a computer needs to use a quite large radiating fin, and a power tube, a row tube and a power amplifier tube in a television need to use the radiating fin. In use, a layer of heat-conducting silicone grease is coated on the contact surface of the electronic element and the heat sink, so that heat emitted by the element is more effectively conducted to the heat sink and then emitted to the surrounding air through the heat sink.
In order to install the heat sink in different products, some processes need to bend the performance of the heat sink, so that the panel surface of the heat sink has a certain camber, which can be shown in fig. 3.
Because the stress structures and the stress degrees of the materials are different, when the radiating fin is bent, the angle of each bending cannot be guaranteed to be the same, therefore, after bending, the bending degree of the plate surface is required to be detected, whether the bending degree accords with the process index is judged, the existing detection method is to preferentially measure the coordinates of the two ends of the plate surface, the difference between the two coordinates is divided by two, so that the bending degree of a product is judged, the average value of the two coordinates obtained by the method cannot be accurately measured and calculated, and therefore, the difference is large, and the accuracy is insufficient.
Therefore, it is necessary to design a method for judging the bending degree of the panel surface of the heat dissipation panel based on the least square method to solve the above problems.
Disclosure of Invention
The invention aims to provide a method for judging the bending degree of a heat radiation plate surface based on a least square method so as to overcome the defects in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a heat dissipation plate face bending degree judging method based on least square method, its includes the measuring apparatu that is used for measuring the face camber, is used for receiving measuring apparatu signal and data and automatic analysis and calculation's controller, its characterized in that: the specific judging method comprises the following steps:
Fitting a reference plane: firstly, fitting reference planes of all the boards, respectively measuring coordinate values of the periphery of the boards through a displacement sensor, fitting a plane equation according to a least square method, and obtaining: z=m1×x+m2×y+k, where z is the distance from the point to the plate, and the equation is the fitted reference plane;
According to the standard point french plane equation: ax+by+cz+d=0, the equation of the fitting can be converted into: m1 x+m2 y+ (-1) z+k=0;
the method can be as follows: a=m1, b=m2, c= -1, d=k;
calculating the distance d between each measuring point and the fitting reference plane: the calculation is performed according to a point-to-plane distance formula: calculating the distance from each point to the fitting reference plane;
In calculating the actual flatness: calculating the flatness by calculating the difference between the highest point and the lowest point, comparing the flatness with reference data, and judging whether the bending degree is qualified or not; preferably, eight points are specifically required to be measured, and the points are an upper left corner, an upper right corner, a lower left corner, a lower right corner, a left middle position, a right middle position, a middle upper position and a middle lower position of the board, wherein the upper left corner, the upper right corner, the lower left corner and the lower right corner are respectively arranged at four corners of the board, the upper left corner and the lower right corner are positioned at the same transverse horizontal line, the upper left corner and the lower left corner are positioned at the same longitudinal horizontal line, the upper right corner and the lower right corner are positioned at the same longitudinal horizontal line, the middle upper position is arranged at the center point between the upper left corner and the lower left corner, the middle upper position is arranged at the center point between the upper left corner and the upper right corner, and the middle lower position is arranged at the center point between the lower right corner and the lower left corner;
The specific calculation method comprises the following steps:
Measuring the left upper corner, the right upper corner, the left lower corner, the right lower corner, the left middle position, the right middle position, the middle upper position and the middle lower position, respectively calculating the distance between eight points and a reference plane, and respectively marking as d01\d02\d03\d04\d05\d06\d07\d08;
and (3) taking data d05\d06\d07\d08 of the middle point positions in the same row or the same column, respectively solving the difference between the data of the middle point position and the data of the two measured point positions, namely, d01-d07\d02-d07\d03-d08\d04-d08\d01-d05\d03-d05\d02-d06\d04-d06, comparing the data with a reference value, and judging the warping degree according to the positive and negative values of the obtained data.
Preferably, the measuring instrument comprises a measuring bottom plate, a plurality of positioning grooves formed in the measuring bottom plate, positioning columns arranged in the positioning grooves, a plurality of measuring mounting holes in the measuring bottom plate and a sensor arranged in the measuring mounting block holes.
Preferably, the sensor is a displacement sensor.
The beneficial effects of the invention are as follows: according to the technical scheme, the reference plane of each plate surface is calculated preferentially through the least square method, so that the distances from different points to the reference plane are calculated by taking the reference plane as a standard, qu Qiaodu of the plate surfaces are obtained through the difference between the highest point and the lowest point, and the camber condition of the plate surfaces is judged, and the judgment accuracy of the camber is greatly improved.
Drawings
FIG. 1 is a top view of a measuring instrument of a method for judging the bending degree of a heat dissipation plate surface based on a least square method;
FIG. 2 is a schematic diagram of measuring points of a method for determining the warpage of a heat dissipating plate surface based on a least square method;
FIG. 3 is a schematic view of a plate surface structure to be measured in the prior art according to the present invention;
in the figure: 1. measuring a bottom plate; 2. positioning columns; 3. measuring the mounting hole; 4. a sensor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1 to 2, a method for judging the warpage of a heat dissipation plate surface based on a least square method includes a measuring instrument for measuring the camber of the plate surface, and a controller for receiving signals and data of the measuring instrument and automatically analyzing and calculating the signals and data;
The measuring instrument comprises a measuring bottom plate 1, a plurality of positioning grooves formed in the measuring bottom plate, positioning columns 2 arranged in the positioning grooves, a plurality of measuring mounting holes 3 in the measuring bottom plate and sensors 4 arranged in the measuring mounting block holes;
The positioning column 2 is used for being matched with a positioning hole on the heat dissipation plate to perform quick positioning and installation, the positioning hole can be specifically exchanged according to the position of a hole site, and the positioning hole is matched with the hole of the heat dissipation plate to be correspondingly arranged in different positioning grooves where different positioning columns 2 are arranged, so that the sensor 4 can be similarly used for transposition according to the position, and therefore the positioning hole is suitable for detection of different plate surfaces.
The sensor is a displacement sensor;
The specific judging method comprises the following steps:
Firstly, fitting a reference plane of each plate surface, wherein the different plate surfaces are different in each datum after bending, so that the planes according to the different reference planes of the plate surfaces are also different;
Coordinate values around the plate surface are measured through a displacement sensor, a plane equation is fitted according to a least square method, and the following steps are obtained: z=m1×x+m2×y+k, where z is the distance from the point to the plate, and the equation is the fitted reference plane;
And then calculating the distance d between each point and the reference plane according to the fitted reference plane formula, and according to a standard point French plane equation: ax+by+cz+d=0, the equation of the fitting can be converted into: m1 x+m2 y+ (-1) z+k=0;
from the above formula, data can be derived, a=m1, b=m2, c= -1, d=k;
And finally, calculating according to a point-to-plane distance formula: calculating the distance from each point to the planned plane;
Calculating and judging each calculated point position according to the reference data; wherein the data for reference may be a customer provided data requirement as an assessment criterion;
Referring to fig. 2, in the specific embodiment, eight sets of sensors are provided for detecting the upper left corner 01, the upper right corner 02, the lower left corner 03, the lower right corner 04, the left middle position 05, the right middle position 06, the middle upper position 07, and the middle lower position 08, respectively;
The upper left corner 01, the upper right corner 02, the lower left corner 03 and the lower right corner 04 are respectively arranged at four corners of a board, the upper left corner 01 and the upper right corner 02 are positioned at the same transverse horizontal line, the lower left corner 01 and the lower right corner 03 are positioned at the same transverse horizontal line, the upper left corner 01 and the lower left corner 03 are positioned at the same longitudinal horizontal line, the upper right corner 02 and the lower right corner 04 are positioned at the same longitudinal horizontal line, the left position 05 is arranged at a center point between the upper left corner 01 and the lower left corner 03, the right position 06 is arranged at a center point between the upper right corner 02 and the lower right corner 04, the middle upper position 07 is arranged at a center point between the upper left corner 01 and the upper right corner 02, and the middle lower position 08 is arranged at a center point between the lower right corner 04 and the lower left corner 03;
the coordinates of four points of the upper left corner 01, the upper right corner 02, the lower left corner 03 and the lower right corner 04 are detected through a displacement sensor, and then the coordinates are brought into a fitted plane equation formula through coordinate data: calculating a reference plane by z=m1 x+m2 y+k;
Then pass through The distance between eight points and the reference plane is calculated according to the formula, data d01\d02\d04\d05\d06\d07\d08 of different points are obtained, the flatness is measured to be the difference between the highest point and the lowest point, in order to calculate the height difference of the plane more accurately, the data d05\d06\d07\d08 of the middle point is taken, the data of the middle point are subtracted by the data of the middle point, namely the data of the two points measured respectively, namely the data of d01-d 07\d02\d03-d08\d04\d08\d01-d 05\d05\d02-d 06\d04-d 06\d 06, and the data are compared with the reference value, and the warping degree is obtained according to the positive and negative values of the obtained data. In order to further judge the bending degree of the plate surface, the plate surface is split into eight parts, and the eight parts are subtracted through the formula, so that bending data can be accurately obtained, the judging accuracy is ensured, the measuring result is maximally close to the real condition of a product, and the minimum error is realized.
The method has the advantages that the reference plane of each plate surface is calculated preferentially through the least square method, so that the distances from different points to the reference plane are calculated by taking the reference plane as a standard, then Qu Qiaodu of the plate surface is obtained through the difference between the highest point and the lowest point, the camber condition of the plate surface is judged, and the judgment accuracy of the camber is greatly improved.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (3)
1. The utility model provides a heat dissipation plate face bending degree judging method based on least square method, its includes the measuring apparatu that is used for measuring the face camber, is used for receiving measuring apparatu signal and data and automatic analysis and calculation's controller, its characterized in that: the specific judging method comprises the following steps:
Fitting a reference plane: firstly, fitting reference planes of all the boards, respectively measuring coordinate values of the periphery of the boards through a displacement sensor, fitting a plane equation according to a least square method, and obtaining: z=m1×x+m2×y+k, where z is the distance from the point to the plate, and the equation is the fitted reference plane;
According to the standard point french plane equation: ax+by+cz+d=0, the equation of the fitting can be converted into: m1 x+m2 y+ (-1) z+k=0;
the method can be as follows: a=m1, b=m2, c= -1, d=k;
calculating the distance d between each measuring point and the fitting reference plane: the calculation is performed according to a point-to-plane distance formula: calculating the distance from each point to the fitting reference plane;
In calculating the actual flatness: calculating the flatness by calculating the difference between the highest point and the lowest point, comparing the flatness with reference data, and judging whether the bending degree is qualified or not;
Specifically, eight points are required to be measured, wherein the eight points are an upper left corner, an upper right corner, a lower left corner, a lower right corner, a left middle position, a right middle position, an upper middle position and a lower middle position of the board, the upper left corner, the upper right corner, the lower left corner and the lower right corner are arranged at four corners of the board, the upper left corner and the upper right corner are positioned at the same horizontal line, the upper left corner and the lower left corner are positioned at the same longitudinal horizontal line, the upper right corner and the lower right corner are positioned at the same longitudinal horizontal line, the upper left position is arranged at the center point between the upper left corner and the lower left corner, the upper right position is arranged at the center point between the upper right corner and the upper right corner, and the lower middle position is arranged at the center point between the lower right corner and the lower left corner; the specific calculation method comprises the following steps:
Measuring the left upper corner, the right upper corner, the left lower corner, the right lower corner, the left middle position, the right middle position, the middle upper position and the middle lower position, respectively calculating the distance between eight points and a reference plane, and respectively marking as d01\d02\d03\d04\d05\d06\d07\d08;
and (3) taking data d05\d06\d07\d08 of the middle point positions in the same row or the same column, respectively solving the difference between the data of the middle point position and the data of the two measured point positions, namely, d01-d07\d02-d07\d03-d08\d04-d08\d01-d05\d03-d05\d02-d06\d04-d06, comparing the data with a reference value, and judging the warping degree according to the positive and negative values of the obtained data.
2. The method for judging the bending degree of the panel surface of the heat dissipation panel based on the least square method according to claim 1, wherein the method comprises the following steps of: the measuring instrument comprises a measuring bottom plate, a plurality of positioning grooves formed in the measuring bottom plate, positioning columns arranged in the positioning grooves, a plurality of measuring mounting holes in the measuring bottom plate and sensors arranged in the measuring mounting block holes.
3. The method for judging the bending degree of the panel surface of the heat dissipation panel based on the least square method according to claim 2, wherein the method comprises the following steps of: the sensor is a displacement sensor.
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| CN202410472266.XA CN118067074B (en) | 2024-04-19 | 2024-04-19 | Least square method-based method for judging bending and warping degree of heat radiation plate surface |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106952056A (en) * | 2017-04-19 | 2017-07-14 | 中铁四局集团有限公司 | Management system of plate-type ballastless track plate |
| CN117739873A (en) * | 2023-12-19 | 2024-03-22 | 西南铝业（集团）有限责任公司 | Board unevenness measuring method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103217117A (en) * | 2012-01-19 | 2013-07-24 | 昆山思拓机器有限公司 | Thickness and planeness measuring method for surface mounting technology (SMT) screen |
| CN114445486A (en) * | 2021-12-31 | 2022-05-06 | 新拓三维技术(深圳)有限公司 | Chip warpage deformation measuring method and device |
| GB2621906B (en) * | 2023-03-30 | 2024-07-17 | Gpc Systems Ltd | A system and method for processing image data |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106952056A (en) * | 2017-04-19 | 2017-07-14 | 中铁四局集团有限公司 | Management system of plate-type ballastless track plate |
| CN117739873A (en) * | 2023-12-19 | 2024-03-22 | 西南铝业（集团）有限责任公司 | Board unevenness measuring method and system |
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