CN110405889B - Method for detecting deformation prevention reliability of plate - Google Patents
Method for detecting deformation prevention reliability of plate Download PDFInfo
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- CN110405889B CN110405889B CN201910634542.7A CN201910634542A CN110405889B CN 110405889 B CN110405889 B CN 110405889B CN 201910634542 A CN201910634542 A CN 201910634542A CN 110405889 B CN110405889 B CN 110405889B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
- B27M3/18—Manufacture or reconditioning of specific semi-finished or finished articles of furniture or of doors
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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
- G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
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- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
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- A Measuring Device Byusing Mechanical Method (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses aThe method for detecting the deformation prevention reliability of the plate comprises the following steps: measuring the initial maximum distance S between the deformation position of the sheet and the surface of the sheet on the first side of the sheetFirst stage(ii) a Vertically placing the plate in water at a preset temperature, and completely immersing the plate in the water; taking out the plate from the water, and wiping the plate dry; measuring the maximum distance S between the deformation position of the first side surface of the plate and the surface of the plate againMeasuring(ii) a Comparing the initial maximum spacing SFirst stageAnd detecting the maximum spacing SMeasuringAnd obtaining the anti-deformation reliability of the plate. The deformation prevention reliability of a certain plate can be rapidly obtained through the detection method, and the deformation prevention performance of furniture made of the plate can be predicted; when the method is adopted to detect various different plates, the selection basis for manufacturing the furniture plates can be provided according to the furniture using environment.
Description
Technical Field
The invention relates to the field of furniture detection, in particular to a method for detecting the deformation prevention reliability of a furniture plate.
Background
In the current furniture industry, due to the influence of environmental temperature and humidity, the most common problem of furniture is the deformation problem of a plate, the reason causing the deformation of the plate is that the load bearing of the plate exceeds the deformation caused by the self-bearing capacity of the plate when the plate is used, the main reason is that the plate absorbs moisture in air to expand due to the damp deformation of the plate in the long-term use process, and the expansion degree of the plate generated at different parts due to structural factors is different, so the generated internal stress is also different, and the deformation of the plate is caused. The deformation of the sheet material can cause a series of quality problems of the furniture, for example, the tightness of the cabinet such as a wardrobe is affected, and the serious deformation of the sheet material can also cause the damage of the furniture. Therefore, the detection on the deformation prevention reliability of the plate is very important, and the direct relation is whether the furniture has serious quality problems in the using process.
In order to prevent the serious quality problem of the furniture caused by the deformation of the plate, before the furniture is manufactured, the plate with the corresponding deformation-preventing reliability is selected according to the deformation-preventing requirement of the corresponding furniture to manufacture the furniture, so that a method for detecting the deformation-preventing reliability of the plate is urgently needed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for detecting the deformation prevention reliability of a plate of furniture, which can quickly detect the deformation prevention reliability of the plate and provide a reference for plate selection during furniture manufacturing.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for detecting the deformation prevention reliability of a plate comprises the following steps:
measuring the maximum distance between the deformation position of the sheet and the surface of the sheet on the first side of the sheet, wherein the maximum distance is the initial maximum distance SFirst stage；
Vertically placing the plate in water at a predetermined temperature, the plate being completely immersed in the water for a predetermined time;
taking out the plate from the water and wiping the surface of the plate dry;
measuring the maximum distance between the deformation position of the first side surface of the plate and the surface of the plate again, wherein the maximum distance is the maximum detection distance SMeasuring；
Comparing the initial maximum spacing SFirst stageAnd said maximum distance of detection SMeasuringAnd obtaining the deformation-preventing reliability of the plate.
Further, the comparing the initial maximum spacing SFirst stageAnd said maximum distance of detection SMeasuringThe method comprises the following steps: calculating the deformation rate epsilon of the plate material, wherein epsilon = (S)Measuring-SFirst stage）/SFirst stage×100%。
Further, the comparing the initial maximum spacing SFirst stageAnd said maximum distance of detection SMeasuringThe method comprises the following steps: calculating the relative deformation amount Delta S of the plate, wherein Delta S = SMeasuring-SFirst stage。
Further, measuring the initial maximum spacing SFirst stageAnd said maximum distance of detection SMeasuringThe method comprises the following steps:
placing the first side of the sheet material upwardly onto a horizontal surface, wherein the first side is a downwardly curved deformed surface;
horizontally putting a steel ruler on the first side surface, wherein two ends of the steel ruler extend out of the edge of the plate;
measuring the maximum distance between the deformation position of the first side surface of the plate and the straight steel ruler by using a measuring tool, wherein the maximum distance is the initial maximum distance SFirst stageOr the detected maximum spacing SMeasuring。
Further, the measuring tool is a feeler gauge or a vernier caliper.
Further, the predetermined temperature is 20 ± 1 ℃.
Further, the top end of the plate is 5-50 mm lower than the water surface.
Further, the preset time is 0.5-72 h.
Further, the pH of the water is 7. + -.1.
Further, before the method for detecting the deformation prevention reliability of the plate, the plate is cut into samples to be detected, wherein the length and the width of each sample are 1 m.
The method for detecting the deformation prevention reliability of the plate measures the initial maximum distance S between the deformation position and the surface of the plate before the plate is soakedFirst stageAnd then measuring the maximum detection distance S of the plate after soaking treatmentMeasuringBy comparing the initial maximum spacing SFirst stageAnd detecting the maximum spacing SMeasuringAnd the deformation prevention reliability of the plate can be obtained. The deformation prevention reliability of a certain plate can be rapidly obtained through the detection method, and the deformation prevention performance of furniture made of the plate can be predicted; when the method is adopted to detect various different plates, the selection basis for manufacturing the furniture plates can be provided according to the furniture using environment.
Drawings
FIG. 1 is a schematic measurement view of an example of the present invention;
FIG. 2 is a schematic illustration of the soaking of a sheet material in an example of the invention;
in the figure:
1-a horizontal platform; 2, plates; 3-a steel ruler; 4-deformation position; 5-water surface.
Detailed Description
To clearly illustrate the idea of the present invention, the present invention is described below with reference to examples.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention is clearly and completely described below with reference to the drawings in the example of the present invention, and it is obvious that the described example is only a part of the example of the present invention, and not a whole example. All other embodiments obtained by a person skilled in the art based on the examples of the present invention without any inventive step shall fall within the scope of protection of the present invention.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used solely to distinguish one from another and are not to be construed as requiring a particular order or sequence, but rather are to be construed according to such usage as is interchangeable under appropriate circumstances.
The invention provides a method for detecting the deformation prevention reliability of a plate, which comprises the following steps:
measuring the initial maximum distance S between the deformation position of the sheet and the surface of the sheet on the first side of the sheetFirst stage；
Vertically placing the plate in water at a preset temperature, and completely immersing the plate in the water;
taking out the plate from the water, and wiping the plate dry;
measuring the maximum distance S between the deformation position of the first side surface of the plate and the surface of the plate againMeasuring；
Comparing the initial maximum spacing SFirst stageAnd detecting the maximum spacing SMeasuringAnd obtaining the anti-deformation reliability of the plate.
This example is achieved by comparing the initial maximum spacing SFirst stageAnd detecting the maximum spacing SMeasuringAnd the deformation prevention reliability of the plate can be obtained. The deformation prevention reliability of a certain plate can be rapidly known by the detection method, and the deformation prevention reliability can be rapidly knownPredicting the deformation prevention performance of the furniture made of the plate, and predicting the deformation trend of the furniture; when the method is adopted to detect various different plates, the selection basis of the plates can be provided for manufacturing furniture according to the factors such as the temperature and humidity of the environment where the furniture is located, the service time and the like.
The embodiments and features of the embodiments in the present application may be combined with each other without conflict. In order to more clearly explain the technical solution of the present invention, the present invention will be described in detail with reference to the accompanying drawings and embodiments.
Example 1
This embodiment provides a plate anti-deformation reliability detection method, in order to save panel, can reach the detection effect of plate anti-deformation reliability again, cuts length and width sample that awaits measuring that all is 1m with panel 2 before detecting, and this detection method includes:
on a first side of the sheet 2, the initial maximum distance S between the deformation location 4 of the sheet 2 and the surface of the sheet 2 is measuredFirst stage；
As shown in fig. 1, the initial maximum spacing SFirst stageThe measuring method comprises the following steps: placing the first side surface of the plate 2 upwards on a horizontal plane, wherein the horizontal plane is provided as a horizontal platform 1, and the first side surface is a downward bending deformation surface; horizontally putting a steel ruler 3 on the first side surface, wherein two ends of the steel ruler 3 extend out of the edge of the plate 2; measuring the maximum distance between the deformation position 4 of the first side of the sheet 2 and the steel ruler 3 by using a measuring tool, wherein the maximum distance is the initial maximum distance SFirst stage. The measuring tool can be a vernier caliper or a feeler gauge, and specifically, the depth gauge of the vernier caliper can be used for directly measuring; or after the maximum distance is measured by using the auxiliary rod, marking on the auxiliary rod, and measuring the distance between the marks on the auxiliary rod by using a vernier caliper; or the maximum distance of the rods is directly measured by a feeler gauge.
Vertically placing the plate 2 in water at a preset temperature, and completely immersing the plate 2 in the water for a preset time; in the embodiment, the PH of the water is 7 +/-1, and as shown in fig. 2, the plate 2 is vertically placed in a water tank, the preset temperature is 20 ℃, and the temperature can be deviated from the upper temperature to the lower temperature by one degree, namely 19 ℃ or 21 ℃; the distance between the top end of the plate 2 and the water surface 5 is 5-50 mm, when the preset time that the plate 2 needs to be soaked is long, water is added into the water tank in more consideration of the water absorption of the plate 2, so that the plate 2 is lower than the water surface by a long distance, the top end of the plate 2 is prevented from leaking out of the water surface after the plate 2 absorbs water, and similarly, when the preset time that the plate 2 is soaked is not long, the top end of the plate 2 cannot leak out of the water surface due to the water absorption of the plate 2, and the plate 2 can be lower than the water surface by a short distance; the predetermined time is 0.5-72 h. In order to stably place the plate 2 in water, a clamp for clamping the plate 2 can be arranged in the water tank, and water is added into the water tank after the plate 2 is clamped; or one end of a flexible material such as a rope is bound on the plate 2, the other end of the flexible material is bound with a heavy object, and then water is added into the water tank; or fixing the plate 2 by using the frame, integrally placing the frame fixed with the plate into the water tank, and adding water into the water tank; like this, panel 2 can suspend in aqueous, can avoid the water tank wall to cause the influence to the testing result to the at utmost.
After the plate 2 is soaked for a preset time, taking out the plate 2 from the water, and wiping the surface of the plate 2; when the plate 2 is wiped dry, the surface of the plate 2 needs to be wiped by a flexible water absorbing material, so that the scratch of the surface of the plate 2 is avoided, and particularly the measurement precision is not influenced after the upward first side surface is scratched.
The maximum distance between the deformed position 4 of the first side of the sheet 2 and the surface of the sheet 2 is measured again, this maximum distance being the maximum distance S to be detectedMeasuring(ii) a Detecting the maximum spacing SMeasuringAt the initial maximum distance S from the aboveFirst stageThe measurement mode is the same.
Comparing the initial maximum spacing SFirst stageAnd detecting the maximum spacing SMeasuringAnd the deformation prevention reliability of the plate 2 is obtained. Wherein the initial maximum spacing S is comparedFirst stageAnd detecting the maximum spacing SMeasuringThe method comprises the following steps: the deformation rate ε of the plate 2 was calculated, where ε = (S)Measuring-SFirst stage）/SFirst stage×100%。
The method of the embodiment is adopted to detect the deformation rate of the following 8 types of plates, wherein the thickness of the plate to be detected is 18mm, and the soaking preset time and the detection result are shown in the following table:
| serial number | Sheet type | Predetermined time (h) | SFirst stage（mm） | SMeasuring（mm） | |
| 1 | Shaving board | 0.5 | 3.6 | 3.7 | 2.8% |
| 2 | Double-veneer shaving board | 4 | 2.8 | 3.5 | 25.0% |
| 3 | Medium density fiberboard | 24 | 1.6 | 2.1 | 31.2% |
| 4 | Double-veneer medium-density fiberboard | 48 | 2.3 | 2.6 | 13% |
| 5 | Plywood board | 24 | 5.6 | 7.0 | 25.0% |
| 6 | Double-faced plywood | 48 | 4.5 | 4.9 | 8.9% |
| 7 | Solid wood board | 48 | 3.2 | 3.5 | 9.4% |
| 8 | Solid wood painted plate | 72 | 3.1 | 4.0 | 29.0% |
In engineering, the deformation rate epsilon of the plate is less than or equal to 20 percent, particularly the deformation rate epsilon of the plate is less than or equal to 5 percent, and the deformation prevention reliability of the plate is excellent; the deformation rate epsilon of the plate is more than 20 percent, and particularly, the deformation prevention reliability of the plate is poor when the deformation rate epsilon is more than 50 percent.
In this embodiment, the initial maximum distance S obtained by the above measurement method is usedFirst stageAnd detecting the maximum spacing SMeasuringAll to the nearest 0.1 mm. In other embodiments of the present invention, more precise measurements of the two parameters may be performed.
In the present embodiment, the initial maximum pitch S is comparedFirst stageAnd detecting the maximum spacing SMeasuringThe method of (1) includes calculating a deformation rate epsilon of the sheet material 2; in other embodiments of the invention, the initial maximum spacing S is comparedFirst stageAnd detecting the maximum spacing SMeasuringMay comprise calculating a relative deformation Δ S of the sheet material, wherein Δ S = SMeasuring-SFirst stage(ii) a Or comparing the initial maximum spacing SFirst stageAnd detecting the maximum spacing SMeasuringThe method includes calculating the deformation rate epsilon of the plate material and calculating the relative deformation quantity delta S of the plate material.
It is noted that some of the structures may be selected differently than the specific examples given above. For example, the length and width of the plate can be other sizes as long as the deformation condition of the plate can be reflected, and the thickness of the plate is determined according to the thickness required to be adopted when corresponding furniture is manufactured; etc. which can be made by those skilled in the art based on their basic skills in understanding the concept of the present invention and are not to be construed as exemplary only.
Finally, it is to be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not intended to be limiting. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention, and these changes and modifications are to be considered as within the scope of the invention.
Claims (5)
1. A method for detecting the deformation prevention reliability of a plate is characterized by comprising the following steps:
measuring the maximum distance between the deformation position of the sheet and the surface of the sheet on the first side of the sheet, wherein the maximum distance is the initial maximum distance SFirst stage；
Vertically placing the plate in water at a predetermined temperature, the plate being completely immersed in the water for a predetermined time; wherein the preset temperature is 20 +/-1 ℃, the top end of the plate is 5-50 mm lower than the water surface, and the preset time is 0.5-72 hours;
taking out the plate from the water and wiping the surface of the plate dry;
measuring the maximum distance between the deformation position of the first side surface of the plate and the surface of the plate again, wherein the maximum distance is the maximum detection distance SMeasuring；
Comparing the initial maximum spacing SFirst stageAnd said maximum distance of detection SMeasuringObtaining the deformation-preventing reliability of the plate; said comparing said initial maximum spacing SFirst stageAnd said maximum distance of detection SMeasuringThe method comprises the following steps: calculating the deformation rate epsilon of the plate material, wherein epsilon = (S)Measuring-SFirst stage)/SFirst stageX 100%, or calculating the relative deformation amount Δ S of the sheet material, wherein Δ S = SMeasuring-SFirst stage；
The board is a shaving board, a medium-density fiberboard, a plywood or a solid wood board.
2. Method according to claim 1, characterized in that the initial maximum spacing S is measuredFirst stageAnd said maximum distance of detection SMeasuringThe method comprises the following steps:
placing the first side of the sheet material upwardly onto a horizontal surface, wherein the first side is a downwardly curved deformed surface;
horizontally putting a steel ruler on the first side surface, wherein two ends of the steel ruler extend out of the edge of the plate;
measuring the maximum distance between the deformation position of the first side surface of the plate and the steel ruler by using a measuring tool, wherein the maximum distance is the initial maximum distance SFirst stageOr the detected maximum spacing SMeasuring。
3. The method of claim 2, wherein the measuring tool is a feeler or a vernier caliper.
4. The method of claim 1, wherein the water has a PH of 7 ± 1.
5. The method according to claim 1, wherein the sheet material is a sample to be tested which is cut to have a length and a width of 1m before the sheet material deformation prevention reliability test method.
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| CN201910634542.7A CN110405889B (en) | 2019-07-15 | 2019-07-15 | Method for detecting deformation prevention reliability of plate |
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| CN201910634542.7A CN110405889B (en) | 2019-07-15 | 2019-07-15 | Method for detecting deformation prevention reliability of plate |
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| CN110405889B true CN110405889B (en) | 2022-02-08 |
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| CN111098191A (en) * | 2020-01-17 | 2020-05-05 | 中铝瑞闽股份有限公司 | Method for simply detecting whether aluminum alloy thick plate is deformed during machining |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413873A (en) * | 2008-12-01 | 2009-04-22 | 江苏宏耐木业有限公司 | Method for detecting floor substrate water absorption expansion rate and water absorption height |
| CN101482485A (en) * | 2008-12-01 | 2009-07-15 | 江苏宏耐木业有限公司 | Detection method for assembled floor-board water absorption expansivity |
| CN107379178A (en) * | 2017-06-05 | 2017-11-24 | 安徽信达家居有限公司 | A kind of method for preventing pine strain cracking |
| CN108196041A (en) * | 2017-12-26 | 2018-06-22 | 圣象（江苏）木业研究有限公司 | A kind of detection method of consolidated floor humidity resistance |
| CN207850339U (en) * | 2018-03-02 | 2018-09-11 | 宁波市产品质量监督检验研究院 | Wood-based plate thickness swelling rate experimental rig |
-
2019
- 2019-07-15 CN CN201910634542.7A patent/CN110405889B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413873A (en) * | 2008-12-01 | 2009-04-22 | 江苏宏耐木业有限公司 | Method for detecting floor substrate water absorption expansion rate and water absorption height |
| CN101482485A (en) * | 2008-12-01 | 2009-07-15 | 江苏宏耐木业有限公司 | Detection method for assembled floor-board water absorption expansivity |
| CN107379178A (en) * | 2017-06-05 | 2017-11-24 | 安徽信达家居有限公司 | A kind of method for preventing pine strain cracking |
| CN108196041A (en) * | 2017-12-26 | 2018-06-22 | 圣象（江苏）木业研究有限公司 | A kind of detection method of consolidated floor humidity resistance |
| CN207850339U (en) * | 2018-03-02 | 2018-09-11 | 宁波市产品质量监督检验研究院 | Wood-based plate thickness swelling rate experimental rig |
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