A fast knife structure with adjustable stiffness at the distal knife end

Abstract

The invention discloses a sharp tool structure capable of achieving rigidity adjusting at the far tool end. The problem that in the prior art, when rigidity adjusting is conducted on the sharp tool structure, hinge and plate spring deformation is prone to being caused is solved. The beneficial effects that design is reasonable and compact, and stable linear output of displacement is achieved are achieved. According to the following scheme, the sharp tool structure capable of achieving rigidity adjusting at the far tool end comprises a frame, multiple groups of lever amplifying mechanisms, a tool connecting block and fine adjusting mechanisms; the lever amplifying mechanisms are arranged in the frame, and the inner side of one end of each lever amplifying mechanism makes contact with or isconnected with the end of a driver; the tool connecting block is used for being connected with a tool and connected with the other ends of the lever amplifying mechanisms through first flexible hinges, and flexible guiding mechanisms are arranged between the two sides of the tool connecting block and the frame; and the fine adjusting mechanisms are arranged in the manner of penetrating through theframe, and the fine adjusting mechanisms penetrate through the ends of the frame and make contact with the lever amplifying mechanisms to achieve the purpose of adjusting the rigidity of the sharp tool structure at the far tool end.

Description

technical field [0001] The invention relates to the field of fast-knife servo, in particular to a fast-knife structure for adjusting stiffness at the far-knife end. Background technique [0002] The fast tool servo system is generally installed on non-circular CNC turning or asymmetric turning machine tools. It is a key technology for the processing of non-circular cross-section parts and non-axisymmetric (ie non-rotational symmetric) optical parts. During the turning process, the spindle drives the workpiece to rotate, and the tool, driven by the FTS, reciprocates along the radial direction (for non-circular turning) or axial direction (for non-axisymmetric turning) of the workpiece at a frequency related to the spindle speed, thereby Process the non-circular cross-sectional profile or non-axisymmetric end face of the workpiece. [0003] At present, the stiffness adjustment point of the fast knife servo system is basically located near the knife end. This stiffness adjustm...

AI Technical Summary

Problems solved by technology

[0004] First, since the adjustment point of the adjustment mechanism is near the knife end and close to the displacement output terminal, the asymmetry of the stiffness adjustment will have a great impact on the linearity and stability of the displacement output, which greatly reduces the precision of the fast knife structure ;

[0005] Second, the existing adjustment mechanism is inefficient in changing the stiffness of the system by changing the stiffness of the leaf spring near the knife end, and requires a large external force to change the already large stiffness of the leaf spring in the axial direction;

[0006] Third, the existing method of changing the stiffness of the system by changing the stiffness of the leaf spring near the knife end will cause irreversible plastic deformation to the overall mechanism, especially the leaf spring and hinge, which will easily cause damage to the entire mechanism

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