Production method of steel plate warm formed parts with high efficiency, low energy consumption and high quality

Abstract

The invention relates to steel plate warm formed parts with high efficiency, low energy consumption and high quality and a production method thereof, belonging to the technical field of part forming. The steel plate for producing parts comprises the following components in percent by weight: 0.02-0.45% of C, 3.50-9.0% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, and the balance of Fe and unavoidable impurities. On the basis of these components, one or more of the following components (in percent by weight) are additionally added: 0.1-3.0% of Ni, 0.2-3.0% of Cr,0.1-0.8% of Mo, 0.3-2.3% of Si, 0.5-2.0% of Cu, 0.0005-0.0050 of B, 0.02-0.30% of Nb, 0.002-0.250% of [N], 0.05-0.25% of Ti, 0.02-0.25% of V, 0.015-3.0% of Al, 0.002-0.005% of RE, and 0.005-0.03% of Ca. The production method comprises the following steps: steel plate heating, steel plate transferring, steel plate precooling, part forming, part cooling, and part temperature control treatment. The production method provided by the invention has the advantages of low cost and high efficiency, and improves the forming rate and final mechanical properties of workpieces.

Description

technical field [0001] The invention belongs to the technical field of parts forming, and in particular provides a high-efficiency, low-energy-consumption and high-quality steel plate warm-formed part and its production method, which is suitable for steel plates with a thickness specification of 0.6mm-20mm and obtains a tensile strength of 800-2200MPa. Parts based on martensitic structure. Background technique [0002] With the requirements of light weight, energy saving and emission reduction and safety improvement of automobiles, high-strength and even ultra-high-strength steels have attracted the attention of material production and automotive application technicians more than ever before. At present, for iron and steel materials, the forming process can be divided into three types according to the forming temperature: cold forming (room temperature), medium temperature forming (such as 400-700°C) and high temperature forming (above 900°C). Due to insurmountable problems...

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Problems solved by technology

However, the existing thermoforming process also has obvious shortcomings, mainly in: 1. High heating temperature requires high equipment, and the main equipment investment is large; 2. The forming pressure holding time is long (about 20 seconds), and the production efficiency is low; 3. During the heating process and transfer process of the components, the surface of the steel plate is severely oxidized at high temperature, and sandblasting equipment is required to remove the surface oxide scale in the subsequent sequence; 4. High temperature forming is also likely to cause local thinning or uneven deformation, and it is impossible to form complex parts with drawing requirements. 5. The design of the cooling mold is difficult and the cost is high (several times higher than that of the cold forming mold); 6. The heating temperature is high and the energy consumption is large

7. The hardness of the formed parts is high, and the cutting of edges and holes can only rely on laser cutting, which has high cost and low production efficiency

The above shortcomings of hot forming steel production are mainly attributed to the essential characteristics of traditional hot forming steel, mainly based on the following reasons: 1. The austenitization temperature of traditional alloy structural steel represented by 22MnB5 is high (A C3 2. The hardenability of traditional 22MnB5 steel is low, which requires a high degree of austenite superheat and a cooling rate of 100°C / s; 3. Based on the short stabilization time of supercooled austenite , can only be deformed at high temperature. Although the elongation rate is high at high temperature, the work hardening rate is low, and it is difficult to perform forming with drawing requirements.

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