Products are manufactured, not tested. However, in the production process, workers should use various inspection tools to inspect the products they manufacture in order to ensure that the final product quality is qualified, rather than checking whether the products are qualified by-product inspectors after the products are manufactured.
With the stone production enterprises paying more attention to the product quality, the stone product quality can not only rely on the product inspectors to inspect, discover, and control, but should be inspected by the product manufacturers themselves in the production process by using various inspection tools, so as to find the abnormal phenomena in the product production process as soon as possible, and take measures to correct and improve, Ensure that the stone products produced meet the quality requirements.
Various inspection tools are used in the production and processing of stone products. Whether product inspectors or production employees should fully understand these inspection tools and know that not many people use them correctly. It is very necessary to popularize this knowledge.
1. Tape measure
Measuring tape, also known as steel tape, is a tool for measuring length or distance. The numbers on the tape measure are divided into upper and lower rows. The lower row is in centimeters (CM) and the upper row is in inches (inch). The measuring tape usually used for stone product inspection is 3M and the scale is 1mm.
2. Steel ruler
Steel ruler is also called steel sheet ruler. It is the simplest length measuring tool. It is made of stainless steel. The upper and lower sides of the scribed surface of the ruler are engraved with scribed lines. Unlike a tape measure, a steel ruler can be retracted freely and can only be taken and placed straight. A 1m steel ruler with a scale of 1mm is commonly used in the inspection of stone products.
The length dimension of the product measured by a steel ruler is not accurate. This is because the space between the scribed lines of the steel ruler is 1mm, and the width of the scribed line itself is 0.1 ~ 0.2mm. Therefore, the reading error during measurement is relatively large, and only the number of millimeters can be read out, that is, its minimum reading value is 1mm, and the value smaller than 1mm can only be estimated. Many stone production enterprises do not use the steel ruler to check the product size, but use it as the calibration tool of the steel tape to check the accuracy of the steel tape.
Set a workbench in the main inspection area of the product, fix the steel ruler on the workbench, and check the accuracy of the steel tape at the workbench every time the employee receives a new tape. After one week of use, the steel tape shall be rechecked to check the accuracy of the tape. Recheck the accuracy of the tape measure every day before work. This can ensure that the plate cut every day will not deviate due to the deviation of the tape.
3. Vernier caliper
Vernier caliper is a measuring tool for measuring length, inner and outer diameter, and depth. The vernier caliper is composed of the main ruler and a vernier attached to the main ruler and capable of sliding. The main ruler is generally in mm, while the vernier has 10, 20, or 50 divisions. According to the different divisions, the vernier caliper can be divided into ten division vernier caliper, twenty division vernier caliper, and fifty division vernier caliper. The vernier with 10 division has 9mm, 20 Division has 19mm and 50 Division has 49mm. There are two pairs of movable measuring claws on the main ruler and vernier of the vernier caliper, namely the internal measuring claw and the external measuring claw. The internal measuring claw is usually used to measure the inner diameter, and the external measuring claw is usually used to measure the length and outer diameter. Digital display vernier caliper is a length measuring tool with a digital display of measured values. It is an instrument for measuring length, internal and external diameter.
4. Flatness ruler
The measuring tool for checking the flatness and straightness of the product surface is usually made of aluminum alloy. In the inspection of stone products, the flatness ruler is usually made of non-deformable granite, with a width of 30 ~ 50mm and a thickness of 20mm.
5. Gloss meter
An instrument for measuring the surface luminosity of stone. The surface of stone products is mostly in the form of a smooth surface, and the brightness of the product surface has a great impact on the product quality. The inspection of product surface luminosity is based on the eyes, and the other method is quantitative detection with the help of a glossiness instrument. The gloss meter must have a sufficient power supply before use. Insufficient power supply has a great impact on the test results. Calibrate the glucometer with a standard plate.
6. Formwork
The template is a kind of inspection tool made of a certain material with a geometric shape to inspect the shape of stone products, and it is an important inspection tool. It is completed by stone production enterprises themselves with 3mm three plywood, aluminum alloy plate, and steel plate through water knife machine, wire cutting machine, or template cutting machine. The chord length and radius of the circular arc plate are generally written on the template of the circular arc plate, and the symbol of the light surface is marked.
7. Right angle wide seat angle ruler
The right angle wide seat angle ruler can accurately measure the vertical deviation of the inner and outer corners of the workpiece. A wide seat angle ruler is a measuring tool commonly used in inspection and marking, which is used to check the verticality of the workpiece. Usually made of cast iron, steel, or granite. The accuracy grade of the wide seat angle ruler is divided into grade 0, grade 1, and grade 2. A feeler gauge shall be used to check the verticality deviation of the product with a wide seat angle ruler.
8. Protractor
Many stone products need to cut corners. The angle inspection tool is a protractor. The inspection tool for measuring the angle of products includes a digital display and a non-digital display protractor. As long as the two sides of the digital display protractor are stuck on the two sides of the tested angle, the angle value can be read out from the display screen, and the angle value can be accurate to 2 digits.
9. Universal angle ruler
Universal angle ruler is also called angle gauge, vernier angle ruler, and universal protractor. It is an angle measuring tool that uses the vernier reading principle to directly measure the angle of the workpiece or scribe. The universal angle ruler is suitable for measuring the internal and external angles of products and can measure 0 ° ~ 320 ° external angle and 40 ° ~ 130 ° internal angle.
10. Plug gauge
Plug gauge is a tool for checking back bolt holes. Insert the bottom of the back bolt hole tester into the hole; Insert the screw of the testing tool downward. If the screw can be completely inserted to the bottom, it proves that the measured hole is qualified; Take out the screw; Put the hole measuring ruler between the bottom of the back bolt hole measuring device and the hole; Then insert the screw of the hole measuring tool downward. If the screw is completely inserted, the hole is completely qualified.
11. Outer caliper
External caliper: external caliper is used to measure the outer diameter of the cylinder or the length of the object, etc. An external caliper is a tool for checking the cylindrical radius with tape and a steel ruler.
12. Inner caliper
The inside diameter caliper is a simple comparison gauge. The inside diameter caliper is used to measure the inside diameter and groove. It cannot directly read out the measurement results, but read the measured length dimension (the diameter also belongs to the length dimension) on the steel ruler, or take down the required dimension on the steel ruler first, and then check whether the diameter of the parts meets the requirements. Generally, it is a tool to check the cylindrical radius with tape and a steel ruler.
These stone inspection tools play different roles in stone product inspection. Product inspectors must fully understand and master the functions, functions, users, and measurement accuracy requirements of these inspection tools, so as to ensure that the inspected products meet the requirements of stone product inspection standards and improve the production quality of products.
