Miniature bearing ring to use standard parts

Use standard parts should be paid attention to the following questions: (1) standard parts has certain technical requirements, such as nominal size and actual deviation, geometric accuracy, position accuracy, hardness, appearance ( Including surface roughness and surface defects) , so in use must take put down gently, prevent touch, completed with timely cleaning wipe, in the location specified. Error between (2) often encountered in the actual production of standard parts, which is according to the two standard test card marked into the line of the table, the contents of the inconsistent results measured parts, this suggests that the standard deviation is not in conformity with the actual tagging content, must step into the check standard, generally allow two standard consistent error is 0. Range of 001 mm, if more than, should stop using to test (3) standard parts and ring there are physical phenomenon of heat bilges cold shrink, ring being measured by the influence of cutting temperature during processing, its shadow decidedly different expansion coefficient and normal temperature of the standard size, due to temperature differences between the two ( Temperature difference) Will cause measurement error. Especially the bearing parts inside and outside circular grinding, temperature difference is particularly obvious, which requires bearing parts with the same or similar to standard temperature ( Often referred to as 'wen') And then to do on the table. Precision bearing parts production more attention should be paid to the temperature difference problem. A method of temperature 'close' is on the workbench, put standard between bearing parts, parked for a period of time ( About 15 min) Check again. Another way is to put the standard parts in the processing of the measured parts in the grinding of cutting fluid 'or' warm, such as grinding parts outside diameter, the cutting speed, after measuring need adjust grinding machine, so need often use standard calibration measuring instrument; Due to standard parts have been placed in the grinding machine cutting fluid, cutting heat and cutting fluid for the sake of temperature, the temperature standard also increases, in such cases using standard parts on the table can reduce the form error, ensure product processing precision measurement.