Self-resistance electric heating intelligent incremental forming method

Abstract

The invention discloses a self-resistance electric heating intelligent incremental forming method. The method comprises the following steps that step A, a calculation model of a volume change rate (dV/dt) of a deformation area is established according to spatial geometric change characteristics of a contact area of a forming tool and a plate in incremental forming; step B, a calculation model of the resistance (Rs) and the contact resistance (Rj) of a material in the area is established according to the circuit characteristics of the contact area in the self-resistance electric heating incremental forming; step C, an instantaneous joule heat model (Q) and an equivalent contact heat conduction coefficient calculation model (K) between the forming tool and the plate contact area are established; and step D, the related parameters are substituted into a user subprogram ABAQUS-VUINTER to obtain a local deformation temperature value. According to the method, the difficulty of electricity, heat and force three-field coupling numerical simulation can be effectively solved, a simulation result is combined with forming equipment, the simulation and manufacturing integrated process is realized, and the processing efficiency and intelligence of the forming process are improved.

Description

technical field [0001] The invention relates to a progressive forming method, in particular to a self-resistance electric heating intelligent progressive forming method, which belongs to the technical field. Background technique [0002] Sheet metal incremental forming technology is a new flexible die-free forming technology for plate and shell parts that combines rapid prototyping and plastic forming. It was proposed by American scholar Leszak in the 1960s and Japanese scholar Kitazawa successfully used it in the 1990s. This technology processes aluminum alloy test pieces. After nearly 20 years of research, incremental forming technology has gradually moved from experimental research to practical application, realizing the transformation of sheet metal forming from the linearization of the "design-manufacturing" process to the integration. It can effectively shorten the life cycle of product manufacturing, reduce energy consumption in the whole production cycle, improve th...

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Problems solved by technology

At present, the self-resistive electric heating incremental forming technology involves the coupling effect of electric-thermal-mechanical three fields. It is impossible to use conventional numerical simulation methods to achieve accurate analysis of this type of proce

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