Device and method for testing normal static stiffness characteristics of joint surfaces of shim plate, foundation and foundation bolt of heavy-duty machine tool

Abstract

The invention provides a device and method for testing normal static stiffness characteristics of joint surfaces of a shim plate, a foundation and a foundation bolt of a heavy-duty machine tool and belongs to the field of heavy-duty machine tool foundation experimentation. The device comprises a material testing machine, a screw rod, a slotted iron block, the foundation bolt, the concrete foundation, a material testing machine base, a force sensor, wood blocks, displacement sensors, a shim plate test piece, a dynamic strain indicator, a data acquisition system and a computer. After a secondary grouting process, the shim plate test piece is connected with the concrete foundation through the foundation bolt, and definite pre-tightening force is applied; a blind hole is formed in the foundation bolt and used for pre-burying of a strain gauge; the displacement sensors are used for measuring normal displacement quantities of the joint surfaces; the concrete foundation is placed on the force sensor of the material testing machine base, the slotted iron block is connected with the material testing machine through the screw rod, and the slotted iron block is attached to the shim plate test piece accordingly; the material testing machine applies static pressure to a stress application part in the longitudinal direction. A direct measurement method is adopted for the device and method, the number of tested physical quantities is reduced, and the deformation situation of a system is reflected really.

Description

technical field [0001] The invention relates to a device and a method for testing the normal static stiffness characteristics of the pad iron-foundation-anchor bolt joint surface, belonging to the technical field of heavy machine tool foundation experiments. Background technique [0002] Heavy-duty CNC machine tools are strategic materials to measure a country's technological peace and comprehensive national strength. Because of their large self-weight and large loads, the working accuracy and life of large-scale components such as bed and columns are directly affected by the foundation and foundation. As we all know, machine tools and even all kinds of machinery are generally not a continuous whole in order to meet various functions, performance, processing requirements and transportation convenience, but are combined by various parts according to certain specific requirements. The contact surface between parts, components, and parts is called "mechanical joint surface", re...

AI Technical Summary

Problems solved by technology

[0003] During the installation and transformation of large machine tools, the contact stiffness of the bed-horn iron-foundation system is often not paid enough attention to, resulting in unstable geometric accuracy, working accuracy and contact accuracy of the guide rail pairs, resulting in bed leveling The workload increases, and even directly affects the manufacturing accuracy and service life of the machine tool

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