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Measurement method of surface stress meter for tempered glass

  • Source: Unknown
  • Date: April 28, 2020
  • Number of views: two hundred and sixty-five
Tempering Glass surface stress meter The measurement method is to use the test instrument to measure the clear step pattern of the tempered glass in the eyepiece field of the test instrument, and the measured step height D, and then multiply the instrument constant K by the step height D to obtain the surface stress value of the tested glass. The surface stress measurement method of the tempered glass in this technology can quickly and effectively measure the surface stress of the tempered glass, It has high measurement accuracy, simple and easy operation, high measurement efficiency, and is suitable for surface stress detection of tempered glass used in buildings.
 
The stress distribution in the tempered glass is that the two surfaces of the tempered glass are compressive stress, the core layer of the plate is in tensile stress, and the stress distribution on the thickness of the glass is similar to a parabola. The center of the glass thickness is the vertex of the parabola, that is, the place where the tensile stress is maximum; The compressive stress is near the two surfaces of the glass on both sides; The zero stress surface is located at about 1/3 of the thickness. Through the analysis of the physical process of tempered quenching, it can be seen that there is a rough proportional relationship between the surface tension of tempered glass and the maximum internal tensile stress in numerical value, so measuring the surface stress of tempered glass becomes a key step to improve and enhance the performance of tempered glass.
 
 
The technical scheme adopted to solve the technical problem is: a method for measuring the surface stress of tempered glass, including the following steps:
 
1) Connect the test instrument to the power supply;
 
2) Drop a few drops of refractive index oil on the bottom surface of the prism of the test instrument;
 
3) Determine the tin dipping surface of the tested glass, and gently place the test instrument on the surface;
 
4) The measuring point refers to two parallel lines parallel to the long side at a distance of 100mm from the long side, and intersects with the diagonal at four points. The four points and the geometric center of the product are the measuring points;
 
5) If the length of the short side of the product is less than 300 mm, two parallel lines parallel to the short side and the center line intersect at two points at a distance of 100 mm from the short side. These two points and the geometric center of the product are the measuring points;
 
6) First, adjust the eyepiece to see the clear scribed line of the reticle in the field of view;
 
7) Respectively adjust the position of the small bulb and shutter on the test instrument to the highest position, and then gradually lower the height of the bulb. After adjustment, slowly adjust the reflector adjustment knob back and forth and pay attention to observe the eyepiece field of view, and repeat the above steps until a clear step pattern is seen in the eyepiece field of view;
 
8) Adjust the micrometer eyepiece so that the coordinate line in the field of view is aligned with the upper end of the step on the horizontal axis first. At this time, read and record the reading on the micrometer eyepiece, Then move the horizontal axis of the coordinate line to the lower end of the step and read the reading on the micrometer eyepiece at this time and make a difference with the last reading (If the second reading is less than the first reading, first add 100 to the second reading and then make a difference with the first reading. Sometimes there are multiple steps in the field of view, take the clearest group in the field of view for measurement, and the difference obtained is the measured step height D;
 
9) Multiplying the instrument constant K by the step height D is the surface stress value of the measured glass;
 
10) The basic calculation formula is:
 
F=stress value of DXKF measured glass (MPa); D Step height read from micrometer eyepiece (Mm)
 
K Instrument constant (300MPa/Mm).
 
The beneficial effect is that the measurement method of the toughened glass surface stress meter can quickly and effectively measure the size of the toughened glass surface stress, and has high measurement accuracy. The method is simple and easy to operate, and has high measurement efficiency. It is suitable for the surface stress detection of the toughened glass used in buildings.
 

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