Tool Trajectory Generation for Chatter Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In machining systems, chatter vibration often reduces machining efficiency, leading to poor surface quality and inefficient machining processes, especially when working with low-rigidity objects or tools with multiple blades, as existing methods focus on machining resistance rather than chatter vibration control.
Innovation Solution
A tool path generation device that calculates machining conditions based on chatter vibration increase and decrease affecting values, determining optimal feed directions and rates to minimize chatter vibration, thereby enhancing machining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If machining conditions are set to be low for some locations of machining at which chatter vibration may be caused or in order to ensure excessive safety, then chatter vibration is suppressed, but the entire part is machined at an unnecessarily low machining efficiency
Solution Approach 1:
The patent applies local quality by calculating chatter vibration affecting values specifically for locations where chatter vibration may be caused, rather than uniformly lowering machining conditions for the entire part. The machining conditions decision section decides machining conditions on the basis of the chatter vibration increase and decrease affecting value calculated by the affecting value calculation section, allowing different machining conditions to be applied to different locations based on their specific chatter vibration risk.
2Reliability
If the rotational speed of the tool is lowered in the case where chatter vibration is caused, then chatter vibration is suppressed, but machining efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by calculating the chatter vibration affecting value in advance using the affecting value calculation section before determining the final machining conditions. The machining condition decision section decides machining conditions on the basis of the pre-calculated affecting value, allowing optimal machining conditions to be determined beforehand that suppress chatter vibration while maintaining high machining efficiency, rather than simply lowering rotational speed as a reactive measure.
Data Source
Figure 1
Figure 2
Figure 3(a)~3(d)
AI summary
OBJECT To obtain a tool path that provides a high machining efficiency with suppressed occurrence of chatter vibration by calculating machining conditions in consideration of a chatter vibration increase and decrease affecting value that affects increase and decrease in chatter vibration. SOLUTION TO THE PROBLEM In a machining condition decision method according to a first embodiment, in step 100, an operator inputs through an input section 28 information that the vibration characteristics of a machine tool device 8 including a tool and a workpiece are unknown, information that the direction of chatter vibration caused in the machine tool device 8 is unknown, information that the magnitude and the direction of the specific cutting resistance of the workpiece against the tool are unknown, and the allowable value of a cutting width or a regenerative width to be discussed later. Next, in S110, the allowable maximum feed rate is selected as a feed rate which is one of machining conditions. After that, in S120, a combination of a cutting depth d, a pick feed p, and a tool attitude at which the machining efficiency becomes maximum (or at which the stability of a machining system is higher with a required machining efficiency satisfied) is calculated. After that, information on the machining conditions is sent to a tool path etc. calculation section 32, and information on a tool path etc. is output to the outside of a tool path generation device.