Cloth hardness tester 9 major maintenance considerations.
1. The tester should follow the operation procedure and can use the standard block to check the hardness tester before and after the test.
2. Hardness tester that is not used frequently. After the start-up, the hardness should be measured several times on the standard. After stabilization, the test piece is measured.
3. The hardness block can only be used on the working surface, and the test point distance of each test is not less than 3mm.
4. In the hardness test, after applying the main test force, it is strictly prohibited to rotate the load wheel.
5. When carrying the hardness tester, the measuring lever should be fixed first, and the weight and the boom should be removed. If the weight, the boom and the upper cover or the fuse are removed, the power plug should be removed first.
6. The hardness tester should be kept clean and covered with a dust cover after the test. Hardness block and steel ball indenter should be coated with anti-rust oil to prevent corrosion.
7. The hardness testing equipment is to perform the cycle verification work at least once a year to ensure the accurate value of the hardness tester.
8. Hardness tester common troubleshooting: When the hardness tester fails, it should be contacted with the relevant unit for repair. Generally, the common fix can be solved by itself.
9. When the durometer meter is not used for a long time, cover the machine with a dust cover. Regularly inject a small amount of oil into the contact surface between the lead screw and the handwheel. Before using the hardness tester, wipe the top surface of the lead screw and the upper end surface of the workbench.
If the hardness indication error is found to be large:
- You can take down the workbench and check if it is clean with the screw contact surface;
- Check if the screw protection sleeve is jacking up the work table;
- Check if the indenter is damaged.
Related knowledge expansion:
First, factors affecting the accuracy of the cloth hardness tester
Second, the measurement range of the cloth hardness tester
Errors caused by data conversion The error of cloth hardness conversion to other hardnesses includes two aspects: one is the measurement error of the cloth hardness itself, which involves the dispersion when tested according to the method and for multiple cloth hardness testers of the same type. Measurement error. On the other hand, it is the error caused by the hardness measured by different hardness test methods. This is because there is no clear physical relationship between one of the various hardness test methods, and it is affected by the unreliable measurement in the comparison.
The error caused by special materials
The conversion table stored in the hardness tester may deviate from the following steel grades:
Heat-resistant tool steels and Leysite chrome steel (tool steel) hard materials cause an increase in the modulus of elasticity, resulting in a lower L value. This type of steel should be tested in cross section. According to the cloth principle, as long as the material has a certain rigidity and can form a rebound, the accurate cloth hardness value can be measured. However, many material cloth types have no corresponding conversion relationship with other types of hardness, so the cloth type hardness tester is currently only installed. Conversion table of nine materials. The specific materials are as follows: steel and cast steel, alloy tool steel, gray cast iron, ductile iron, cast aluminum alloy, copper-zinc alloy, copper-tin alloy, pure copper, stainless copper.
For samples of special materials, the user can use the fitting curve provided by the company to make a special conversion table. In actual production, the metal materials used are various. Because the cloth hardness tester is sensitive to the processing method of the material and the alloying element composition of the material, the hardness conversion table stored in the cloth hardness tester chip cannot meet the needs of the user. In the test, the user can use the fitting to make his own special hardness conversion table.