During CNC machining, unexpected issues often arise, but no matter what they are, they must be addressed promptly. Oil leaks are also quite common. If a leak occurs, it’s easy to identify the leaking component, whether it’s a faulty component or the CNC lathe cylinder.
If the component is faulty, repair is straightforward. If the problem is a cylinder, repair becomes more complex and, in severe cases, can render the machine useless. So, let’s examine the causes of oil leaks in CNC machining centers. The following points should be considered:
1. Failure to Change the Oil According to Regulations
Failure to change the oil according to regulations often leads to oil leaks in CNC machining centers. There are three main areas of concern when changing oil:
- If a component uses high-viscosity lubricant, arbitrarily switching to a low-viscosity lubricant can affect the sealing performance of the corresponding housing, shaft bore, and other components, sometimes significantly reducing the sealing performance of these areas.
- Failure to clean the oil tank during oil changes can allow contaminants inside to enter the lubrication system, causing blockages in the oil lines, wear of oil seals, and leaks.
- Excessive oil volume during oil changes, especially in areas with rotating parts, can easily cause oil overflow due to the agitation created by these rotating parts.
2. Improper Selection and Adjustment of Lubrication System Components
Improper selection and adjustment of lubrication system components can also cause oil leaks.
For example, CNC machine maintenance personnel may:
- Select an oil pump with excessive pressure or output.
- Over-adjust the pressure of relief valves, safety valves, and pressure reducing valves when adjusting the system pressure.
- Over-adjust the flow rate of the CNC machine’s lubrication system, resulting in mismatches with the oil return system and sealing system.
Other Causes and Preventive Measures
In fact, there are more reasons for oil leaks in CNC machining centers than just the above. If you encounter similar problems during operation, be sure to thoroughly inspect and identify the cause promptly to avoid unnecessary losses.
After purchasing the machining center, conduct a thorough inspection to check for casting defects or damaged parts. Contact the manufacturer immediately if necessary.
Operator Notes for CNC Machining Centers
Operators using CNC machining centers should also note the following:
- During the first trial cut, use single-stage operation.
- When the CNC milling machine automatically begins operation, set the rapid override and feed rate (S) to their lowest setting, and then cut into the workpiece to improve efficiency.
- When using a CNC milling machine program, pay special attention to the coordinate representation of the CNC system.
- Avoid touching tools and chips on the CNC milling machine. Chips must be cleaned with a brush.
