CN117128837A - Device and method for measuring straightness coefficient of bus of magnesium alloy wallboard - Google Patents
Device and method for measuring straightness coefficient of bus of magnesium alloy wallboard Download PDFInfo
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- CN117128837A CN117128837A CN202311104821.5A CN202311104821A CN117128837A CN 117128837 A CN117128837 A CN 117128837A CN 202311104821 A CN202311104821 A CN 202311104821A CN 117128837 A CN117128837 A CN 117128837A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005259 measurement Methods 0.000 claims description 17
- 238000000691 measurement method Methods 0.000 claims 1
- 238000011156 evaluation Methods 0.000 description 8
- 238000005452 bending Methods 0.000 description 6
- 230000000750 progressive effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Classifications
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B5/25—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
- G01B5/252—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes for measuring eccentricity, i.e. lateral shift between two parallel axes
Abstract
The application relates to a measuring device and a measuring method for the straightness coefficient of a bus of a magnesium alloy wallboard, wherein the measuring device comprises a measuring device main body, a through hole is formed in the middle of the measuring device main body, a measuring pointed cone is arranged in the through hole, the cone tip is downward, and the measuring pointed cone can freely slide up and down along the axial direction of the through hole; the top of the measuring tip cone is axially provided with a main measuring graduated scale, and the measuring graduated scale is connected with a main body of the measuring device through a graduated scale fixing plate and is fixed by adopting a fixing bolt; the scale axis of the measuring micrometer is coincident with the scale axis of the main measuring micrometer in the front-back direction, and the measuring micrometer is fixed; the side of the measuring micrometer is provided with a main measuring micrometer fixing bolt, and the main measuring micrometer fixing bolt and the measuring micrometer are timely fixed together in the measuring process. The measuring device has the advantages of simple structure, convenient operation and high measuring precision, and the measuring precision of the straightness coefficient of the bus of the magnesium alloy wallboard is improved by the method.
Description
Technical Field
The application belongs to the technical field of wallboard size precision evaluation standards and measurement, and particularly relates to a device and a method for measuring a bus straightness coefficient of a magnesium alloy wallboard, which can be applied to large-size magnesium alloy wallboard bus straightness deviation measurement and size precision evaluation.
Background
The magnesium alloy wallboard component is a very important large shell component on an aerospace vehicle, and is an important outer layer protection component of various instruments and equipment of aerospace equipment. The size precision of the integral wallboard directly influences the operation precision and the operation performance of the aerospace equipment. Therefore, in processing monolithic panel components for large-size aerospace devices, the dimensional accuracy of the panel skin surface is one of the important performance indicators. The evaluation method of the surface size precision of the panel skin and the related parameter measurement are one of important technical problems in the field of large panel component research.
The existing method for measuring the straightness deviation of the bus of the magnesium alloy wallboard adopts a ruler measuring method and a wire drawing measuring method. The ruler measuring method is to contact the side face of the long ruler with the wallboard along the direction of the bus, and measure the gap size between the ruler and the wallboard bus to obtain the bus straightness deviation, but the method has the defects of low measuring precision and low efficiency. The stay wire measuring method adopts a tightening thin wire or metal wire to be pulled from one end of the wallboard to the other end along the bus direction of the side surface of the wallboard, and measures the maximum gap size from the tightening thin wire or metal wire to the side surface of the wallboard.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a device and a method for measuring the bus straightness coefficient of a magnesium alloy wallboard, which are used for measuring the bus straightness deviation and the bus straightness coefficient of the magnesium alloy wallboard so as to solve the problems of low accuracy, low efficiency and labor consumption of wallboard dimension measurement in the prior art.
The utility model provides a magnesium alloy wallboard generating line straightness accuracy coefficient measuring device, includes measuring device main part, the through-hole has been seted up at measuring device main part middle part, and the measurement pointed cone sets up in the through-hole, and the pointed cone is down, and the measurement pointed cone can be followed through-hole axial and upwards and downwards freely to slide; the top of the measuring tip cone is axially provided with a main measuring graduated scale, and the measuring graduated scale is connected with a main body of the measuring device through a graduated scale fixing plate and is fixed by adopting a fixing bolt; the scale axis of the measuring micrometer is coincident with the scale axis of the main measuring micrometer in the front-back direction, and the measuring micrometer is fixed; the side of the measuring micrometer is provided with a main measuring micrometer fixing bolt, and the main measuring micrometer fixing bolt and the measuring micrometer are timely fixed together in the measuring process.
The through hole is of an inverted T shape, and the appearance of the measuring pointed cone is matched with the inverted T-shaped through hole.
The main measuring graduated scale and the measuring pointed cone are of an integrated structure.
The measuring method of the magnesium alloy wallboard bus straightness coefficient measuring device specifically comprises the following steps:
(1) Measuring the straightness value of a bus: placing a measuring device on a magnesium alloy panel to be measured, aligning to any measuring point on the surface of the magnesium alloy panel skin in the bus direction, measuring the bus straightness value of the measuring point on the surface of the magnesium alloy panel skin by reading a main measuring scale and a measuring micrometer, and marking as H 1 ；
(2) Measuring the straightness values of the buses at N points: according to the method of the step (1), the positions of the measuring points are sequentially changed, different positions in the bus direction on the surface of the magnesium alloy panel skin are taken as the measuring points, the bus straightness values of N measuring points are measured and recorded as
H i ，i＝1～N；
(3) Determining the maximum deviation value of the straightness of the bus: the straightness values H of N buses are measured 1 ～H i Maximum value H of (2) Maximum value And a minimum value H Minimum of The difference of (2) is defined as the maximum deviation of the straightness of the bus bar on the surface of the magnesium alloy panel skin, and is recorded as delta H Maximum value ，△H Maximum value ＝H Maximum value -H min;
(4) Determining a bus straightness coefficient K m ：K m is maximum ＝△H Maximum value /(b 0 +b 1 ) X 100%, where K m The linear coefficient of the bus is shown as a percent; deltaH Maximum value The maximum deviation of the straightness of the bus is mm; b 0 The grid spacing of the wall plates is mm; b 1 The width of the shoulder of the rib is mm;
(5) Determining whether the wallboard meets the requirements in terms of the dimension according to the technical requirements:
if the maximum bus straightness deviation meets the technical requirement, namely delta H Maximum value <△H Requirements for The size of the wallboard meets the requirement;
if the maximum bus-bar coefficient meets the technical requirements, i.e. K m is maximum <K m requirement The wall plate size meets the requirements.
The range of N values in step (2) is 5< N <20.
The beneficial effects of the application are as follows:
the application provides a device and a method for measuring the bus straightness coefficient of a magnesium alloy wallboard, which can measure the bus straightness coefficient of the surface of a skin of the magnesium alloy wallboard, namely, the magnesium alloy wallboard bus straightness deviation and the bus straightness coefficient are adopted to represent the magnesium alloy wallboard size precision evaluation index. The measuring device adopts a main measuring scale, a measuring micrometer and a pointed measuring pointed cone, wherein the contact between the measuring pointed cone and the surface of the magnesium alloy panel skin is the point-to-surface contact, so that the measuring precision of the bus straightness coefficient of the magnesium alloy panel is improved; the main measuring scale and the measuring micrometer are adopted, the measuring precision of the bus straightness coefficient of the magnesium alloy wallboard is high, and the measuring precision reaches the micrometer precision; the measuring device has the advantages of simple structure, convenient operation and high measuring precision.
The application solves the problem of evaluating the surface dimensional accuracy of the magnesium alloy panel skin, and the proposed bus straightness deviation and bus straightness coefficient evaluation method is also very suitable for evaluating the dimensional accuracy of the variable-curvature panel component.
Drawings
FIG. 1 is a schematic diagram of dimensional deviations in the bus direction of a magnesium alloy wallboard in accordance with the present application;
FIG. 2 is a schematic view of structural dimensions of a magnesium alloy panel according to the present application;
FIG. 3 is a front view of a device for measuring the straightness coefficient of a bus bar of a magnesium alloy wallboard;
FIG. 4 is a side view of a magnesium alloy wallboard busbar straightness coefficient measuring device provided by the application;
FIG. 5 is a schematic diagram showing the dimensions of a magnesium alloy wallboard blank according to embodiment 1 of the present application;
FIG. 6 is a schematic view of a magnesium alloy panel member according to the present application;
in the embodiment of the present application, reference numerals are as follows, in combination with the accompanying drawings:
1-a main measuring scale; 2-measuring micrometer; 3-a main measuring scale fixing bolt; 4-a graduated scale fixing plate; 5-a measuring device body; 6-measuring the pointed cone; 7-fixing bolts; 8-wall parts, 9-actual outer contour, 10-theoretical outer contour, 11-theoretical inner contour.
Detailed Description
In order to make the technical solution of the present application better understood by those skilled in the art, the present application will be further described with reference to the accompanying drawings and specific embodiments.
For magnesium alloy panel products, there are easily pits and dimensional deviations in the direction of the bus bar on the surface of the skin, the actual outer contour line, the theoretical outer contour line and the theoretical inner contour line of the bus bar of the panel are as shown in fig. 1, the dimensional differences between the actual outer contour line and the theoretical outer contour line in the direction of the bus bar on the surface of the skin of the magnesium alloy panel are called as bus bar straightness dimensional deviations, and the dimensional deviations at the central position of the grid of the magnesium alloy panel are the largest, therefore, the bus bar straightness deviation defined by the application refers to the dimensional differences between the actual contour line and the theoretical contour line at the central position of the grid on the surface of the skin of the magnesium alloy panel, and is called as bus bar straightness deviation, and is expressed by delta H. The bus straightness coefficient refers to the relative value of the dimension difference between the actual contour line and the theoretical contour line of the grid center position of the magnesium alloy panel skin surface in the bus direction, and is called the bus straightness coefficient, K is used m And (3) representing. K (K) m ＝△H/(b 0 +b 1 ) X 100%, where K m The bus straightness coefficient (%), deltaH is the bus straightness deviation value (mm), and b is the bus straightness deviation value (mm) 0 For panel grid spacing (mm), b 1 The panel construction is sized for rib shoulder width (mm) as shown in fig. 2 and panel components are shown in fig. 6.
The surface size precision of the panel is evaluated by adopting the bus straightness coefficient of the panel skin surface, and the method is called a bus straightness coefficient evaluation method. The bus straightness coefficient evaluation method is suitable for the dimensional accuracy evaluation of the equal-curvature wallboard and the variable-curvature wallboard parts, and the larger the bus straightness coefficient of the surface of the skin is, the larger the surface unevenness of the skin of the magnesium alloy wallboard is, and the lower the dimensional accuracy of the magnesium alloy wallboard is. Therefore, the smaller the straightness coefficient of the bus of the magnesium alloy wallboard is, the better the surface quality of the magnesium alloy wallboard is.
As shown in fig. 3-4, the measuring device for the straightness coefficient of the bus of the magnesium alloy wallboard provided by the application comprises a measuring device main body 5, wherein a through hole is formed in the middle of the measuring device main body, a measuring tip cone is arranged in the through hole, the tip of the cone faces downwards, and the measuring tip cone can freely slide upwards and downwards along the axial direction of the through hole to measure the straightness deviation of the bus of the wallboard; the through hole is of an inverted T shape, and the appearance of the measuring pointed cone is matched with the inverted T-shaped through hole. The top of the measuring tip cone is provided with a main measuring graduated scale along the axial direction of the measuring tip cone, the main measuring graduated scale 1 and the measuring tip cone 6 are of an integrated structure, and the main measuring graduated scale 1 slides up and down along with the measuring tip cone 6. The measuring micrometer 2 is connected with the main body of the measuring device through a micrometer fixing plate and is fixed by adopting a fixing bolt 7, the scale axis of the measuring micrometer is coincident with the scale axis of the main measuring micrometer in the front-back direction, and the measuring micrometer 2 is fixed. The main measurement scale fixing bolt 3 is arranged on the side of the measurement micrometer, the position of the main measurement scale 1 can be fixed at any time in the measurement process, the main measurement scale and the measurement micrometer 2 are fixed together in time, and the bus straightness deviation data can be read easily.
Example 1
Referring to Table 1, a method for measuring the straightness coefficient of bus bar of magnesium alloy wallboard, taking the magnesium alloy wallboard shown in FIG. 5 as an example, the magnesium alloy wallboard adopted in this embodiment is a magnesium alloy grid wallboard, the model is AZ31, the dimensions are 200mm×100mm×7mm, and the thickness t is as follows 0 7mm rib height t 2 Skin thickness t of 3.5mm 1 3.5mm, panel grid spacing b 0 20mm rib shoulder width b 1 Is 5mm. The magnesium alloy wallboard forming technological parameter is magnesium alloy grid type wallboard progressive press bending forming technological parameterComprises a forming temperature T of 260 ℃ and a mould preheating temperature T Mould The pressing height h is 3mm at 100 ℃, the width s of the female die is 50mm, and the curvature radius r of the wallboard is 103.65mm; the progressive press bending feed quantity Deltau is 25mm and the pressing speed V is 5mm/s. The method specifically comprises the following steps:
(1) Measuring the straightness value of a bus: placing a measuring device on a magnesium alloy panel to be measured, enabling the bottom surface of a main body of the measuring device to contact the surface of the magnesium alloy panel skin, aligning to any measuring point in the bus direction of the surface of the magnesium alloy panel skin, reading by a main measuring scale 1 and a measuring micrometer 2, measuring the bus straightness value of the measuring point on the surface of the magnesium alloy panel skin, and recording as H 1 ；
(2) Bus straightness values of 10 points were measured: according to the method of the step (1), the positions of the measuring points are sequentially changed, different positions in the bus direction on the surface of the magnesium alloy panel skin are taken as the measuring points, the bus straightness values of N measuring points are measured, and the values are recorded as H i ，i＝1～10。
(3) Determining the maximum deviation value of the straightness of the bus: the straightness values H of N buses are measured 1 ～H i Maximum value H of (2) Maximum value And a minimum value H Minimum of The difference of (2) is defined as the maximum deviation of the straightness of the bus bar on the surface of the magnesium alloy panel skin, and is recorded as delta H Maximum value ，△H Maximum value ＝H Maximum value -H Minimum of ＝0.11mm，H Maximum value ＝0.11，H Minimum of ＝0.00。
(4) Determining a bus straightness coefficient K m ：K m is maximum ＝△H Maximum value /(b 0 +b 1 ) X 100%, where K m Is bus straightness coefficient (%), delta H Maximum value Maximum deviation of bus straightness (mm), b 0 For panel grid spacing (mm), b 1 Is the width (mm) of the shoulder of the rib. K in the present embodiment m is maximum ＝△H Maximum value /(b 0 +b 1 )×100％＝0.44％。
TABLE 1 bus straightness deviation and bus straightness coefficient on magnesium alloy panel skin surface
(5) Determining whether the wallboard meets the requirements in terms of the dimension according to the technical requirements:
the maximum value of the straightness deviation of the bus of the magnesium alloy wallboard is 0.11mm, which is smaller than 0.20mm of the technical requirement, and the dimensional accuracy meets the requirement.
The maximum value of the straightness coefficient of the bus of the magnesium alloy wallboard is 0.44%, less than 0.80% of the technical requirement, and the dimensional accuracy meets the requirement.
Example 2
The magnesium alloy wallboard adopted in the embodiment is a magnesium alloy grid wallboard, the model is AZ31, the size is 200mm multiplied by 100mm multiplied by 7mm, and the thickness t is 0 7mm rib height t 2 4.0mm, skin thickness t 1 3.0mm, panel grid spacing b 0 20mm rib shoulder width b 1 Is 5mm. The magnesium alloy wallboard forming technological parameters are magnesium alloy grid type wallboard progressive press bending forming technological parameters, and comprise a forming temperature T of 260 ℃ and a mould preheating temperature T Mould The pressing height h is 5mm at 100 ℃, the width s of the female die is 50mm, and the curvature radius r of the wallboard is 64.06mm; the progressive press bending feed quantity Deltau is 25mm and the pressing speed V is 5mm/s.
The method for measuring the straightness coefficient of the bus of the magnesium alloy wallboard specifically comprises the following steps:
(1) Measuring the straightness value of a bus: placing a measuring device on a magnesium alloy panel to be measured, enabling the bottom surface of a main body of the measuring device to contact the surface of the magnesium alloy panel skin, aligning to any measuring point in the bus direction of the surface of the magnesium alloy panel skin, reading by a main measuring scale 1 and a measuring micrometer 2, measuring the bus straightness value of the measuring point on the surface of the magnesium alloy panel skin, and recording as H 1 ；
(2) Bus straightness values of 10 points were measured: according to the method of the step (1), the positions of the measuring points are sequentially changed, different positions in the bus direction on the surface of the magnesium alloy panel skin are taken as the measuring points, the bus straightness values of N measuring points are measured, and the values are recorded as H i ，i＝1～10。
(3) Determining the maximum deviation of bus straightnessDifference value: the straightness values H of N buses are measured 1 ～H i Maximum value H of (2) Maximum value And a minimum value H Minimum of The difference of (2) is defined as the maximum deviation of the straightness of the bus bar on the surface of the magnesium alloy panel skin, and is recorded as delta H Maximum value ，△H Maximum value ＝H Maximum value -H Minimum of ＝0.16mm，H Maximum value ＝0.17，H Minimum of ＝0.01。
(4) Determining a bus straightness coefficient K m ：K m is maximum ＝△H Maximum value /(b 0 +b 1 )×100％＝0.64％。
The maximum value of the straightness deviation of the bus of the magnesium alloy wallboard is 0.16mm, which is smaller than the technical requirement of 0.20mm, and the dimensional accuracy meets the requirement.
The maximum value of the straightness coefficient of the bus of the magnesium alloy wallboard is 0.64%, less than 0.80% of the technical requirement, and the dimensional accuracy meets the requirement.
Example 3
The present embodiment differs from embodiment 1 only in the parameters of the magnesium alloy panel, and the rest of the settings are the same. The magnesium alloy wallboard adopted in the embodiment is a magnesium alloy grid wallboard, the model is AZ31, the size is 200mm multiplied by 100mm multiplied by 7mm, and the thickness t is 0 7mm rib height t 2 5.0mm, skin thickness t 1 2.0mm, panel grid spacing b 0 20mm rib shoulder width b 1 Is 5mm. The magnesium alloy wallboard forming technological parameters are magnesium alloy grid type wallboard progressive press bending forming technological parameters, and comprise a forming temperature T of 260 ℃ and a mould preheating temperature T Mould The temperature is 100 ℃, the pressing height h is 7mm, the width s of the female die is 50mm, and the curvature radius r of the wallboard is 64.06mm; the progressive press bending feed quantity Deltau is 25mm and the pressing speed V is 5mm/s.
The method for measuring the straightness coefficient of the bus of the magnesium alloy wallboard specifically comprises the following steps:
(1) Measuring the straightness value of a bus: placing the measuring device on a magnesium alloy panel to be measured, enabling the bottom surface of the main body of the measuring device to contact the surface of the magnesium alloy panel skin, aligning to any measuring point on the bus direction of the surface of the magnesium alloy panel skin, and reading by a main measuring scale 1 and a measuring micrometer 2Measuring the straightness value of the bus of the measuring point on the surface of the magnesium alloy panel skin, and recording as H 1 ；
(2) Bus straightness values of 10 points were measured: according to the method of the step (1), the positions of the measuring points are sequentially changed, different positions in the bus direction on the surface of the magnesium alloy panel skin are taken as the measuring points, the bus straightness values of N measuring points are measured, and the values are recorded as H i ，i＝1～10。
(3) Determining the maximum deviation value of the straightness of the bus: the straightness values H of N buses are measured 1 ～H i Maximum value H of (2) Maximum value And a minimum value H Minimum of The difference of (2) is defined as the maximum deviation of the straightness of the bus bar on the surface of the magnesium alloy panel skin, and is recorded as delta H Maximum value ，△H Maximum value ＝H Maximum value -H Minimum of ＝0.17mm，H Maximum value ＝0.19，H Minimum of ＝0.02。
(4) Determining a bus straightness coefficient K m ：K m is maximum ＝△H Maximum value /(b 0 +b 1 )×100％＝0.68％。
The maximum value of the straightness deviation of the bus of the magnesium alloy wallboard is 0.17mm, which is smaller than the technical requirement of 0.20mm, and the dimensional accuracy meets the requirement.
The maximum value of the straightness coefficient of the bus of the magnesium alloy wallboard is 0.68%, less than 0.80% of the technical requirement, and the dimensional accuracy meets the requirement.
In order to prove that the measuring device and the measuring method provided by the application are used for improving the measuring precision, the device and the method provided by the application and the existing ruler method are adopted for respectively measuring and comparing the dimensional precision of the wallboard product provided by the embodiment 3, and the results are shown in the table 2, wherein the two methods are used for completing five measurements.
Table 2 comparative analysis of wallboard product measurements provided in example 3
And combining the measurement results shown in Table 2, wherein the maximum value and the minimum value of the bus straightness deviation measured by adopting a ruler method are different by 0.05mm, and the maximum value and the minimum value of the bus straightness coefficient are different by 0.20%.
The maximum value and the minimum value of the bus straightness deviation measured by the device and the method provided by the application are different by 0.01mm, and the maximum value and the minimum value of the bus straightness coefficient are different by 0.04%. Obviously, by adopting the device provided by the application, the measurement accuracy is improved by 4 times.
Claims (5)
1. The utility model provides a magnesium alloy wallboard generating line straightness accuracy coefficient measuring device which characterized in that: the measuring device comprises a measuring device main body, wherein a through hole is formed in the middle of the measuring device main body, a measuring pointed cone is arranged in the through hole, the cone tip is downward, and the measuring pointed cone can freely slide up and down along the axial direction of the through hole; the top of the measuring tip cone is axially provided with a main measuring graduated scale, and the measuring graduated scale is connected with a main body of the measuring device through a graduated scale fixing plate and is fixed by adopting a fixing bolt; the scale axis of the measuring micrometer is coincident with the scale axis of the main measuring micrometer in the front-back direction, and the measuring micrometer is fixed; the side of the measuring micrometer is provided with a main measuring micrometer fixing bolt, and the main measuring micrometer fixing bolt and the measuring micrometer are timely fixed together in the measuring process.
2. The magnesium alloy wallboard busbar straightness coefficient measuring device according to claim 1, wherein: the through hole is of an inverted T shape, and the appearance of the measuring pointed cone is matched with the inverted T-shaped through hole.
3. The magnesium alloy wallboard busbar straightness coefficient measuring device according to claim 1, wherein: the main measuring graduated scale and the measuring pointed cone are of an integrated structure.
4. A measuring method of a magnesium alloy wallboard bus straightness coefficient measuring device according to any one of claims 1 to 3, characterized by comprising the following steps:
(1) Measuring the straightness value of a bus: placing the measuring device on the magnesium alloy panel to be measured, aligning to any measuring point in the bus direction of the surface of the magnesium alloy panel skin, and passingReading by a main measuring graduated scale and a measuring micrometer, measuring the straightness value of a bus of the measuring point on the surface of the magnesium alloy panel skin, and recording as H 1 ；
(2) Measuring the straightness values of the buses at N points: according to the method of the step (1), the positions of the measuring points are sequentially changed, different positions in the bus direction on the surface of the magnesium alloy panel skin are taken as the measuring points, the bus straightness values of N measuring points are measured and recorded as
H i ，i＝1～N；
(3) Determining the maximum deviation value of the straightness of the bus: the straightness values H of N buses are measured 1 ～H i Maximum value H of (2) Maximum value And a minimum value H Minimum of The difference of (2) is defined as the maximum deviation of the straightness of the bus bar on the surface of the magnesium alloy panel skin, and is recorded as delta H Maximum value ，△H Maximum value ＝H Maximum value -H Minimum of ；
(4) Determining a bus straightness coefficient K m ：K m is maximum ＝△H Maximum value /(b 0 +b 1 ) X 100%, where K m The linear coefficient of the bus is shown as a percent; deltaH Maximum value The maximum deviation of the straightness of the bus is mm; b 0 The grid spacing of the wall plates is mm; b 1 The width of the shoulder of the rib is mm;
(5) Determining whether the wallboard meets the requirements in terms of the dimension according to the technical requirements:
if the maximum bus straightness deviation meets the technical requirement, namely delta H Maximum value <△H Requirements for The size of the wallboard meets the requirement;
if the maximum bus-bar coefficient meets the technical requirements, i.e. K m is maximum <K m requirement The wall plate size meets the requirements.
5. The measurement method of the magnesium alloy wallboard bus straightness coefficient measurement device is characterized by comprising the following steps of: the range of N values in step (2) is 5< N <20.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311104821.5A CN117128837A (en) | 2023-08-29 | 2023-08-29 | Device and method for measuring straightness coefficient of bus of magnesium alloy wallboard |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311104821.5A CN117128837A (en) | 2023-08-29 | 2023-08-29 | Device and method for measuring straightness coefficient of bus of magnesium alloy wallboard |
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