Optimization method of one-time die forging forming process of magnesium alloy based on machinability analysis

Abstract

The invention discloses a method for optimizing a magnesium alloy primary die forging forming process based on machinability analysis, and belongs to the field of material science and technology. The method includes the following steps: Step 1. Determine the initial design variable range of magnesium alloys based on actual production experience; Step 2. In order to determine the actual machinable range of magnesium alloy die forgings with complex shapes, use Latin The hypercube test design method generates uniform random sampling points to obtain the sampling values ​​of the design variables (deformation temperature and reduction rate) in the simulation test; Step 3: Establish a finite element model coupled with machinability analysis to simulate the actual forging process of parts , to obtain the response quantity; Step 4, obtain the response surface model of the machinable range of the magnesium alloy complex shape die forging; Step 5, obtain the optimization method of the magnesium alloy one-time die forging forming process. The method of the invention is scientific and advanced, one-time final forging is formed, no pre-forging is needed, the production efficiency is improved, and the cost is reduced.

Description

technical field [0001] The invention discloses a method for optimizing a magnesium alloy primary die forging forming process based on machinability analysis, and belongs to the field of material science and technology. Background technique [0002] Magnesium and magnesium alloys are currently the lightest metal structural materials that can be applied industrially. They have the advantages of high specific strength and specific stiffness, excellent damping and shock absorption, thermal conductivity, electromagnetic shielding and easy recycling. , 3C products (computers, electronics, communications), chemical and military industries and other fields have broad application prospects. Compared with cast magnesium alloy parts, magnesium alloy forged parts have fine and uniform structure, superior comprehensive mechanical properties, and can meet higher design requirements. It is one of the main methods to realize the large-scale production of magnesium alloys. However, due to t...

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Problems solved by technology

However, due to the close-packed hexagonal crystal structure of magnesium and magnesium alloys, there are few slip systems at room temperature, and the following difficulties exist in forging and forming: 1) The forging temperature range is narrow (usually around 150°C), and when the temperature is low, the plasticity is poor and the deformation resistance is large. It is easy to produce defects such as forging cracks and poor filling; when the temperature is high, the plasticity is improved, but it will cause defects such as mold sticking, coarse grains, and flow localization; 2) It is sensitive to strain rate, and the plasticity decreases rapidly with the increase of strain rate. Usually formed at low strain rates (10-3s -1 ~1s -1 range), low productivity, prone to repeated recrystallization and grain growth; 3) the number of heating times should not be too much, the strength of magnesium alloys decreases with the increase of heating and forging times, and the traditional isothermal constant reduction rate processing is difficult to achieve One-shot forging

[0003] At present, magnesium alloy forging and pressing forming technology adopts multiple die forging at a constant temperature and constant pressure. Although it can solve the problem of poor low-temperature plasticity and difficult deformation of magnesium alloys, multiple hot forgings will not only lead to grain growth, but also mixed crystals and microstructures. The uniform phenomenon reduces the overall mechanical properties of forgings; and due to the complex process and low reduction rate, it leads to long forming time, low production efficiency and increased manufacturing cost

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