An optimization method for the layout of machine tool anchor bolts

Abstract

The invention discloses a method for optimizing the layout of anchor bolts of a machine tool, which comprises the following steps: 1) setting the number and spacing of anchor bolts of the machine tool; 2) calculating the difference between the center point of the worktable when the worktable and the workpiece are at various positions on the bed Deformation, and then select the maximum deformation and minimum deformation of the middle point of the worktable when the worktable and the workpiece are at each position of the bed, and then use the result of the subtraction of the maximum deformation and the minimum deformation as the horizontal axis of the bed The straightness error δ of the movement; 3) The straightness error δ of the horizontal axis of the bed is used as the objective function, and the spacing and number of the anchor bolts are used as independent variables to optimize, and the straightness error of the horizontal axis of the bed is obtained. The corresponding anchor bolt spacing and quantity when δ is the smallest, and then the machine tool anchor bolt layout is carried out according to the anchor bolt spacing and quantity. The present invention obtains the layout of the anchor bolts corresponding to the minimum straightness error of the axis movement of the horizontal axis of the bed.

Description

technical field [0001] The invention belongs to the technical field of machine tool design and relates to an optimization method, in particular to an optimization method for the layout of machine tool anchor bolts. Background technique [0002] The contour error of the workpiece comes from the relative pose error between the tool and the workpiece of the CNC machine tool, and the straightness of the horizontal axis of the bed is an important precision index that affects the relative pose error between the tool and the workpiece. However, due to the gravity of the workbench and the workpiece, the bed system will be deformed, especially when the workbench moves along the bed rails, the center of gravity is constantly changing, which will eventually affect the straightness error of the bed horizontal axis and the layout of the anchor bolts. is a significant factor affecting the error. [0003] At present, domestic machine tool companies basically rely on experience to design t...

AI Technical Summary

Problems solved by technology

However, these alternative layouts are still given based on experience and cannot reflect the optimal layout scheme

At the same time, only the deformation of the bed is considered, and the change of the center of gravity of the bed and table parts caused by the movement of the worktable is not considered. The change of the center of gravity is the main reason for the increase in the straightness error of the horizontal axis movement. Only the machine bed is guaranteed The small deformation may not make the straightness error of the horizontal axis motion meet the design requirements, and it is likely that the straightness error of the horizontal axis motion of the bed will still be guaranteed by scraping the guide rail surface in the follow-up. The assembly efficiency is low, and it also produces large unnecessary expenses

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