Apparatus and method for evaluating mechanical properties of viscous medium

Abstract

The present invention relates to an apparatus and a method for evaluating mechanical properties of a viscous medium. The apparatus comprises a bracket, an extrusion die, an electric cylinder, a plunger, a viscous medium and a detection device. The extrusion die is fixedly connected at the upper end of the bracket; a cavity is arranged in the extrusion die; the electric cylinder is arranged at thelower end of the bracket; the plunger is inserted into the cavity and the plunger is connected with the output end of the electric cylinder; the viscous medium is filled between the plunger and the cavity; the detection device is arranged on one side of the electric cylinder; the detection device comprises a computer, a force sensor and a displacement sensor; the displacement sensor is fixedly connected with the contact surface between the electric cylinder and the plunger; the force sensor is arranged on the contact surface between the electric cylinder and the displacement sensor; an extrusion hole pressure sensor is inserted into the extrusion die above the cavity; the extrusion hole pressure sensor is in contact with the viscous medium; and the electric cylinder, the force sensor, thedisplacement sensor, and the extrusion hole pressure sensor are all electrically connected with the computer. The apparatus provided by the present invention has the advantage that a viscous medium with a suitable mechanical property can be selected for viscous medium pressure forming.

Description

technical field [0001] The invention relates to the technical field of viscous medium forming, in particular to a viscous medium mechanical property evaluation device and evaluation method. Background technique [0002] Viscous medium pressure forming is a new method of plate soft mold forming developed in recent years. Using semi-solid, flowable viscous medium with certain viscosity and strain rate sensitivity as forming soft mold can improve the shape, dimension accuracy and wall thickness of formed parts. The distribution uniformity and surface quality have been applied in high-end equipment manufacturing fields such as aviation and aerospace. [0003] In the pressure forming process of viscous medium, the characteristic of non-uniform pressure distribution of viscous medium is the key to control the flow of materials, the degree of plastic deformation and the distribution of stress in the forming process, which affects the shape and dimension accuracy, wall thickness dis...

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Problems solved by technology

[0004] Due to the high molecular weight of the viscous medium and its certain flowability, the traditional upsetting and tensile test methods cannot be used to obtain the relationship between the stress of the viscous medium and the degree of deformation and rate sensitivity. At the same time, the molecular weight of the traditional viscous medium is discontinuous (such as The molecular weight of the viscous medium produced by the standard is 10kg / mol and 500kg / mol, but if there is no viscous medium with a molecular weight between 10kg / mol and 500kg / mol, the molecular weight will be discontinuous), how to choose the optimal molecular weight of the viscous medium, It is necessary to propose an experimental measurement method equivalent to the real-time continuous change of the molecular weight of the viscous medium, and to optimize the molecular weight of the viscous medium, so it is necessary to explore a method that can accurately obtain the mechanical properties of the viscous medium

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