Dynamic friction coefficient measuring systems in material forming process

A technology of dynamic friction coefficient and forming processing, which is applied in the system field of material processing technology, can solve the problems that the contact surface cannot reach the friction contact state, the friction surface wears, and the measurement accuracy is not high, and achieves a simple structure, good rigidity, and high sensitivity. Effect

Inactive Publication Date: 2008-03-05
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

"The disadvantage is that the inertial measurement principle of the mechanical transmission type is used. During the measurement process, the surface friction between the test piece and the turntable needs to drive the turntable to rotate, and there is a lateral direction between the test piece and the test piece fixing groove. The gap makes the contact surface unable to achieve a stable friction contact state, the friction surface is severely worn, and accompanied by a large amount of contact heat, resulting in extremely unstable values ​​and low measurement accuracy

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  • Dynamic friction coefficient measuring systems in material forming process

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[0016] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0017] As shown in Figure 1, this embodiment includes: CNC machine tool handle 1, friction head 2, specimen fixing table 4, three-phase dynamic instrument piezoelectric sensor platform 5, charge amplifier 7 and A / D acquisition computer 8, friction head 2 is set under the handle 1 of the CNC machine tool, and the specimen fixing table 4 is fixed on the piezoelectric sensor platform 5 of the three-phase dynamometer, which is connected to the A / D acquisition computer 8 through the charge amplifier 7 .

[0018] Described A / D acquisition computer 8 comprises A / D acquisitio...

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Abstract

The system comprises: a shank of digital control machine tool, a friction head, a test piece fastening table, a three-phase dynamometer piezo-electrical sensor platform, a charge amplifier and a A/D collection computer. The friction head is located under the shank of digital control machine tool; the test piece fastening table is secured on the three-phase dynamometer piezo-electrical sensor platform; the three-phase dynamometer piezo-electrical sensor platform is secured on the working table of the digital control milling machine; the three-phase dynamometer piezo-electrical sensor platform is connected to the A/D collection computer via the charge amplifier.

Description

technical field [0001] The invention relates to a system in the technical field of material processing, in particular to a system for measuring the coefficient of dynamic friction in material forming processing. Background technique [0002] In the material forming process, there is either mechanical relative movement between the mold and the surface of the workpiece, or the plastic flow of deformed metal, so there is inevitably friction. Friction has an extremely important influence on the plastic forming process. First of all, poor friction and lubrication state can easily lead to defects such as out-of-tolerance product size, unsatisfactory surface quality, and insufficient plastic deformation. Inconsistencies in actual production; severe wear between the mold and the workpiece will also cause premature failure of the mold and increase production costs. Therefore, in order to reasonably control and utilize friction and provide a basis for mold and process design, it is ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/02
Inventor 田成达唐鼎李大永彭颖红
Owner SHANGHAI JIAO TONG UNIV
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