The crankshaft clearance requirements of high-precision presses are usually related to the type of press, the operating environment and the manufacturing standards. Especially in the field of precision machining, the clearance requirements of the crankshaft are particularly strict. The following are some common standards and considerations for the crankshaft clearance requirements of high-precision presses:
1. Definition of crankshaft clearance
The clearance of the crankshaft usually refers to the radial clearance between the crankshaft bearing and the crankshaft, that is, the gap between the crankshaft and the bearing, which affects the rotation, lubrication and working accuracy of the shaft. Too large a clearance may lead to insufficient lubrication or bearing wear, while too small a clearance may cause bearing jamming or excessive friction.
2. Clearance standard reference
The crankshaft clearance requirements of high-precision presses vary depending on the design, manufacturing standards and operating conditions of the equipment. Common standards and reference values include:
Bearing clearance: Generally speaking, the crankshaft bearing clearance of precision presses is usually between 0.01 mm and 0.1 mm, and the specific value depends on the bearing type, working conditions and manufacturing tolerance requirements.
Design tolerance: The crankshaft and bearing design of high-precision presses need to be very precise, and the tolerances are usually small. Common bearing tolerances are IT5 to IT7.
Lubrication clearance: The flow and pressure of the lubricating oil are also very important for the clearance requirements. Usually, a certain oil film thickness must be maintained to ensure stable lubrication between the crankshaft and the bearing to avoid overheating and wear.
3. Influencing factors
The crankshaft clearance of a high-precision press is not only related to the bearing type, material and manufacturing tolerance, but also affected by the following factors:
Use environment: Under conditions such as high temperature, heavy load, and high speed, the working environment of the crankshaft requires a higher clearance to ensure stable operation of the equipment.
Lubricant type: Different lubricants and lubrication methods will affect the clearance requirements. For example, when using a full hydrostatic bearing, the lubricating oil film thickness is larger, and a slightly smaller clearance may be allowed.
Working cycle: The operating frequency and load conditions of the press will affect the choice of clearance. If the press runs under high load for a long time, the clearance may need to be relatively loose to accommodate thermal expansion and load changes.
4. Adjustment of crankshaft clearance
In order to ensure the stable operation of the crankshaft in the press, the clearance can be adjusted in the following ways:
Select appropriate bearing size and material to ensure good matching accuracy and wear resistance.
Precisely process the shaft and bearing seat to ensure the matching accuracy between the crankshaft and the bearing.
Optimize the lubrication system to ensure that the lubricating oil can effectively cover the bearing surface and form a stable oil film.
To ensure the accuracy of the crankshaft clearance is crucial to the operating stability, service life and processing accuracy of the press, so it should be designed and adjusted according to the specific standards and requirements of the equipment.
