Static stiffness testing method for horizontal machining centre

Abstract

The invention relates to a static stiffness testing method for a horizontal machining center, which comprises the following steps of: simulating the working state of a main bearing under the action of cutting force when a machine tool works, loading the head of a spindle of the horizontal machining centre through a loader, arranging three detection points on the head of the spindle and the left and right sides of the upper part of a gantry frame, and positioning the spindle at a central position of the gantry frame of the machine tool, and eight limiting positions on the left, right, upper and lower sides and opposite angles of the central position; and detecting deformation values of different parts of the machine tool, arranging the loader on a work bench, reading the magnitude of the loading force by using a measuring cell arranged on the loader, and completing the strain detection by adopting a laser interferometer. The eight-point static stiffness testing method is designed and generated on the basis of a statistical average rule, has high practicability and accuracy, is convenient to operate, has a simple experimental scheme and low requirement on experimental facilities.

Description

technical field [0001] The invention relates to a method for testing the static stiffness of a numerically controlled machine tool, in particular to a method for testing the static stiffness of a horizontal machining center. Background technique [0002] The static stiffness of the machining center has an important influence on the vibration resistance of the system, the dynamic stiffness of the system and the stability limit of self-excited vibration, which in turn affects the machining efficiency and surface quality of the parts. The knowledge of elastic mechanics tells us that in order to know the static stiffness of the machining center, a certain external force must be applied to it, and the corresponding strain under the action of the external force must be measured, so that the static stiffness of the machining center can be calculated from the constitutive equation. stiffness. For the test method of the static stiffness of ordinary machine tools, the research has be...

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Problems solved by technology

[0003] The present invention aims at the shortcomings of poor operability and unsatisfactory test results of the static stiffness test method of the current numerical control machining center, and provides a static stiffness test method of the horizontal machining center in combination with the actual structural characteristics of the box-in-box structure machining center , this test method can be applied not only to horizontal machining centers with a box-in-box structure, but also to horizontal machining centers with similar structures

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