What Causes Poor Rigidity Of Machining Center & How To Fix

Due to the insufficient rigidity of the machining center, errors occur. Generally speaking, the rigidity of machining center is mainly related to three factors: workpiece, machine tool and tool.

The speed and cutting force of the machining center machine tool have a direct impact on the machining accuracy, and if the rigidity of the tool and workpiece does not meet the standard, it will naturally produce errors. For example, when machining, if the tool angle changes, the cutting amount is large, and the fixture rigidity is insufficient, under the comprehensive effect, there will inevitably be errors, especially when machining deformable workpieces or workpieces with large surplus, the probability of error will increase.

In case of poor rigidity of the machine tool, what should be done on the premise that the performance of the machine tool cannot be changed? The tool and cutting parameters can be adjusted to reduce the rigidity of the tool side. To balance the rigidity of the system. For example:

– Shorten the tool overhang as much as possible.

– Use large-diameter cutters as much as possible, and consider using anti vibration tool bars such as cemented carbide if the l/d exceeds a certain value.

– Use the front corner blade.

– Use sparse tooth cutters.

– Reduce the tip R.

– Adjust cutting speed, cutting depth and feed.

– Change the main deflection angle of the tool.

– Use sharp grooved blades.

There are two forms of tool rigidity difference:

1. Collapsible blade

On the premise that the machine tool cannot be replaced, it can only be balanced by adjusting the tool and cutting parameters. For example:

– Use the negative front corner blade.

– Use a larger blade.

– Increase the tip R.

– Use strong grooved blades.

– Adjust cutting speed, cutting depth and feed.

– Change the main deflection angle of the tool.

– Increase the number of teeth of the tool.

– Use a dense tooth cutter. (chip removal must be considered) etc.

2. Vibration knife (the workpiece has vibration marks), which can be adjusted according to the first point.

The rigidity of machining center is a key point that cannot be ignored in metal cutting. It not only affects product quality, but also affects processing efficiency and processing cost. Using good equipment + hydraulic fixture can solve the rigidity of one side, but it also needs to match the rigidity of the tool to give full play to the maximum function of the system. When the cutting tool becomes the one with poor rigidity, it will also cause great trouble for processing. Moreover, after all, not most people use good equipment + good fixtures. Therefore, how to balance the rigidity of the system is particularly important.