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A short-process integrated manufacturing method for rolling and deep processing of high-strength steel automobile plates

A manufacturing method and technology for automobile sheets, which are applied in the field of rolling and deep processing, can solve problems such as large changes in mechanical properties, high strength of hot-rolled coils, and difficulties in cold processing, and achieve the effects of promoting comprehensive utilization, accelerating industrial upgrading, and increasing benefits

Active Publication Date: 2017-01-11
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hot-rolled coils generally have high strength, high hardness, good plasticity, and difficult cold processing. At the same time, if no measures are taken, the mechanical properties will change too much, which will bring corresponding difficulties to the subsequent process.

Method used

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  • A short-process integrated manufacturing method for rolling and deep processing of high-strength steel automobile plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The raw materials are put into a heating furnace with a heating temperature of 1250°C. After conventional rough rolling and finish rolling, the final rolling temperature is 790°C.

[0022] Cool to 650°C at a slow cooling rate of 5°C / s, and hold at 650°C for 2 minutes to form a stable pearlite structure in the high-strength steel automobile sheet.

[0023] The high-strength steel automobile sheet is cut into the shape and size required by the stamping and quenching die through the shearing device, and the cut sheet is transferred to the continuous heating furnace by the high-temperature intelligent manipulator for heating.

[0024] In a continuous heating furnace, heat to 850°C at a heating rate of 10°C / s and hold for 3 minutes to ensure that the entire structure of the stamping and quenching part is transformed into austenite, and the grains are not too coarse. Then, the stamping and quenching parts are transferred from the continuous heating furnace to the stamping and...

Embodiment 2

[0029] The raw material is put into the heating furnace, the heating temperature is 1250°C, after conventional rough rolling and finish rolling, the final rolling temperature is 820°C.

[0030] Cool to 700°C at a slow cooling rate of 10°C / s, and hold at 700°C for 3 minutes to form a stable pearlite structure in the high-strength steel automotive sheet.

[0031] The high-strength steel automobile sheet is cut into the shape and size required by the stamping and quenching die through the shearing device, and the cut sheet is transferred to the continuous heating furnace by the high-temperature intelligent manipulator for heating.

[0032] In a continuous heating furnace, heat to 880°C at a heating rate of 15°C / s and hold for 4 minutes to ensure that the entire structure of the stamping and quenching parts is transformed into austenite, and the grains are not too coarse. Then, the stamping and quenching parts are transferred from the continuous heating furnace to the stamping and...

Embodiment 3

[0037] The raw materials are put into a heating furnace with a heating temperature of 1250°C. After conventional rough rolling and finish rolling, the final rolling temperature is 850°C.

[0038] Cool to 750°C at a slow cooling rate of 15°C / s, and hold at 750°C for 5 minutes to form a stable pearlite structure in the high-strength steel automobile sheet.

[0039] The high-strength steel automobile sheet is cut into the shape and size required by the stamping and quenching die through the shearing device, and the cut sheet is transferred to the continuous heating furnace by the high-temperature intelligent manipulator for heating.

[0040] In a continuous heating furnace, heat to 910°C at a heating rate of 20°C / s and hold for 5 minutes to ensure that the entire structure of the stamping and quenching part is transformed into austenite, and the grains are not too coarse. Then, the stamping and quenching parts are transferred from the continuous heating furnace to the stamping an...

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Abstract

A rolling and deep-processing short-process integrated manufacturing method of a high-strength steel automobile sheet includes following steps: heating raw materials in a heating furnace, performing controlled rolling including crude rolling and finish rolling, laminar cooling the rolled raw material, performing comprehensive blanking, heating the obtained sheet material, moulding and quenching the sheet material, performing a cutting process and a shot blasting process to obtain a finished product. The raw material is heated to more than 1250 DEG C in the heating furnace. A finish rolling temperature is 820 + / - 30 DEG C. The rolled sheet material is cooled to the temperature of 700 + / - 50 DEG C at a temperature decreasing rate of 10 + / - 5 DEG C / s, wherein the temperature is maintained for 2-5 min. The sheet material is heated to 880 + / - 30 DEG C at a temperature increasing rate of 15 + / - 5 DEG C / s in a continuous heating furnace with temperature maintenance for 3-5 min. The stamping and quenching member is subjected to stamping and quenching at the same time, wherein the flow velocity of cooling water in a stamping and quenching die is 50 + / - 10 DEG C / s. The stamped and quenched member is cooled to 180 + / - 50 DEG C / s to obtain a super-high strength steel part in a homogeneous martensitic structure, wherein the strength of extension can reach higher than 1500 MPa. The method can produce the high-strength steel automobile sheet at a high quality and a high efficiency, can reduce cost, can promote comprehensive utilization of secondary energy sources such as low-temperature waste heat and the like, can achieve integrated production from raw materials to the product, and can achieve energy saving, consumption reducing and environment protecting.

Description

technical field [0001] The invention belongs to the field of rolling and deep processing, in particular to a method for rolling and deep processing of high-strength steel automobile plates. Background technique [0002] With the continuous increase of my country's automobile sales, the automobile industry has become an important force to promote my country's economic growth. The development trend of automobile lightweight makes the application of high-strength materials more and more widely. High-strength steel is one of the fastest-growing and most dynamic steel types in recent years. Because of its high strength, good ductility and weldability, it is widely used in automobile manufacturing and other fields. Since the formability of high-strength steel is worse than that of ordinary steel plates, and the higher the strength, the more difficult it is to form, it is easy to crack, and the springback is severe. Stamping and quenching forming technology is the cutting-edge tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C21D6/00
Inventor 彭艳刘才溢孙建亮邢鹏达陈国兴
Owner YANSHAN UNIV
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