How to repair and maintain precision measuring tools?

The correct use of precision measuring tools is one of the important conditions to ensure product quality. In order to maintain the accuracy of measuring tools and the reliability of their work, in addition to operating in accordance with reasonable methods of use during use, the maintenance and maintenance of measuring tools must also be done.

1. When measuring parts on the machine tool, wait until the parts are completely stopped, otherwise it will not only cause premature wear of the measuring surface of the measuring tool and loss of accuracy, but also cause accidents.

2. Before measuring, the measuring surface of the measuring tool and the measured surface of the part should be wiped clean, so as not to affect the measurement accuracy due to the presence of dirt. It is wrong to use precision measuring tools such as vernier calipers, dial gauges and dial indicators to measure the forging blanks, or the surface with abrasives (such as emery, etc.), which will easily cause the measurement surface to wear quickly and lose accuracy.

3. When measuring tools are in use, do not stack them with tools, knives, such as files, hammers, turning tools and drills, to avoid damage to the measuring tools. Don't just put it on the machine tool to avoid the measuring tool falling and damage due to the vibration of the machine tool. Especially vernier calipers, etc., should be placed flat in a special box to avoid deformation of the ruler body.

4. The measuring tool is a measuring tool and must not be used as a substitute for other tools. For example, it is wrong to use a vernier caliper to draw lines, a centimeter as a small hammer, a steel ruler as a screwdriver, and a steel ruler to clean up chips. It is also wrong to use a measuring tool as a toy, such as holding a centimeter in your hand, and arbitrarily swinging or shaking it, and it is easy to make the measuring tool lose its accuracy.

5. Temperature has a great influence on the measurement results. The precise measurement of parts must be carried out at 20℃. Generally, the measurement can be performed at room temperature, but the temperature of the workpiece and the measuring tool must be the same, otherwise, the measurement result will be inaccurate due to the thermal expansion and contraction characteristics of the metal material. Temperature also has a great influence on the accuracy of measuring tools. Measuring tools should not be placed in the sun or on the bedside box, because the temperature of the measuring tools will not be able to measure the correct size. Do not place precision measuring tools near heat sources (such as electric furnaces, heat exchangers, etc.) to avoid thermal deformation of the measuring tools and loss of accuracy.

6. Do not place precision measuring tools near magnetic fields, such as on the magnetic table of a grinder, so as not to make the measuring tools magnetic

7. When it is found that the precision measurement has abnormal phenomena, such as uneven surface of the measuring tool, burrs, rust spots and inaccurate scale, the ruler body is bent and deformed, the movement is not flexible, etc., the user should not disassemble and repair it by himself, let alone Rough methods such as hammering, filing, and polishing with emery cloth are allowed to repair by oneself, so as not to increase the error of the measuring tool. If the above situation is found, the user should take the initiative to send it to the measuring station for repair, and continue to use it after checking the accuracy of the measuring tool (Guide: How to solve the natural aging fracture of the stretched part)

8. After the measuring tools are used, they should be wiped clean in time. Except for stainless steel measuring tools or those with protective coating, the metal surface should be coated with a layer of anti-rust oil, placed in a special box, and stored in a dry place to avoid growth. rust.

9. Precision measuring tools should be regularly verified and maintained. Precision measuring tools used for a long time should be sent to the measuring station for maintenance and verification accuracy on a regular basis, so as to avoid product quality accidents caused by the out-of-poor indication error of the measuring tool.