This standard specifies that the difference between the maximum and minimum heights of the rim (rim height difference) is used to measure the deformation of flat products. This standard specifies that the difference between the maximum and minimum diameters of the outer diameter (outer diameter difference) is used to measure the deformation of hollow products. This standard is applicable to the inspection of deformation defects of pottery and porcelain. GB 3300-1991 Method for inspection of deformation of daily-use ceramics GB3300-1991 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method for deformation of domestic ceramic ware
Standard test method for deformation measurement of domestic ceramic ware1 Subject content and scope of application
GB 3300-91
Replaces GB 3800--82
This standard specifies that the difference between the maximum height and the minimum height of the rim (rim height difference) is used to measure the deformation of flat products. This standard specifies that the difference between the maximum diameter and the minimum diameter of the outer diameter (outer diameter difference) is used to measure the deformation of hollow products. This standard is applicable to the inspection of deformation defects of pottery and porcelain. 2 Determination of deformation of flat products
2.1 Rim height difference of flat products
The reading measured by a mold ruler or a step ruler according to this method is the rim height difference of the flat product. 2.2 Measuring tools
2.2.1 Glass plate
Use a grade 10 precision steel ruler to check the unevenness of the glass plate. There should be no obvious gap between the glass plate and the steel ruler. The size of the glass plate must be larger than the size of the product being measured.
2.2.2 Die ruler
The die ruler is 220mm long, 6mm wide, and the upper edge is 0.2-0.5mm wide (see Figure 1). The bottom height error is less than or equal to 0.05mm, and the bottom flatness is less than or equal to 0.05mm. The surface roughness is required to be clear with the engraved lines and numbers. AA enlargement
1 guest 20
wedge ruler
approved by the State Administration of Technical Supervision in 1991-0210
implemented on 1991-12-01
GB 3300—91
wedge ruler has high precision and accurate measurement, and is specified as a ceramic deformation arbitration test gauge. It can also be used for strict ceramic deformation graded inspection. 2.2.3 step ruler
The step ruler has 16 steps, each step is 10mm long, the total length is 160mm, and the ruler width is 3mm. The height of the first step is 0.5mm, and the height of each step increases by 0.5mm in sequence. The height of the twelfth step is 6mm, and the height of each step increases by 1mm thereafter (see Figure 2). The surface is required to be smooth, the step height tolerance shall not exceed ±0.05mm, the length tolerance of each step shall not exceed ±0.1mm, and the width tolerance shall not exceed ±0.3mm. 1.5
Figure 2 Step ruler
Step ruler is only used for quick inspection with undemanding requirements because of its low precision. 2.2.4Material of wedge ruler and step ruler
Use stainless steel, alloy aluminum, alloy copper and other materials with high hardness (HRC≥61). 2.3Measuring method
2.3.1 Place the product to be tested naturally upside down on the glass plate. 2.3.2 Place the wedge ruler or step ruler flat on the glass plate and push the ruler into the largest gap between the edge of the product and the glass plate. In the following cases, the reading on the ruler corresponding to the largest gap is the edge height difference: a
When the upper edge of the wedge ruler begins to gently rub the highest point of the gap without resistance, the reading corresponding to this contact point; The reading of the step surface that has passed when a higher step surface of the step ruler is stopped by the edge at the largest gap, and the step surface lower than the step surface has passed. 3 Determination of deformation of hollow products
3.1 External diameter difference
The diameter difference measured by this method is the external diameter difference. 3.2 Measuring tools
According to the measurement accuracy required by the measured product, select a measuring tool with a measurement accuracy one order of magnitude higher. 3.3 Use a measuring tool that meets the requirements of 3.2 to measure the maximum and minimum diameters of the external diameter of the hollow product. The difference is the external diameter. 15
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GB3300—91
This standard is proposed by the Ministry of Light Industry of the People's Republic of China. This standard is under the jurisdiction of the National Center for Standardization of Daily-use Ceramics. This standard was drafted by the Ceramics Research Institute of the Ministry of Light Industry. The main drafter of this standard is Huang Cai'e.
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