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Heat treatment method for shear blade

A heat treatment method and workpiece technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as easy cracks, achieve the effects of reducing internal stress, improving hardness and wear resistance, and avoiding deformation

Inactive Publication Date: 2019-04-05
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is to provide a heat treatment method for cutting blades, which can reduce the cooling rate of the product, improve the hardness and uniformity of the cutting blade, reduce the deformation of the product, and solve the problem that cracks are easily generated during use

Method used

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  • Heat treatment method for shear blade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Flying shears for cold rolling, the cutting blade size is 40mm×65mm×2030mm, the chemical composition and its mass percentage are: C1.4~1.6%, Si≤0.6%, Mn≤0.6%, Cr11.0~13.0% , Mo0.7~1.2%, V0.5~1.1%.

[0032] The production process includes the following steps:

[0033] A. Prepare forging blanks according to the above-mentioned chemical components and their mass percentages;

[0034] B. Carry out isothermal spheroidization treatment on the forged billet, firstly heat to 850°C, hold for 6 hours, then cool down to 790°C, hold for 6 hours, process the forged billet to the size close to the finished product, and control the margin at 2-3mm to obtain the workpiece;

[0035] C. Heat the workpiece to 1000°C and keep it warm for 4 hours;

[0036] D. Use a spray quenching machine to spray water + blowing to quench the workpiece. When spraying water + blowing, the water pressure is 2MPa, the wind pressure is 2MPa, and the cooling rate is 50°C / min; when the temperature of the workp...

Embodiment 2

[0039] Flying shears for hot rolling, the size of the cutting blade is 100mm×190mm×1550mm, the chemical composition and its mass percentage are: C0.4~0.7%, Si0.8~1.2%, Mn0.2~0.5%, Cr4. 75-5.50%, Mo1.1-1.75%, V0.8-1.2%.

[0040] The production process includes the following steps:

[0041] A. Prepare forging blanks according to the above-mentioned chemical components and their mass percentages;

[0042] B. Carry out isothermal spheroidization treatment on the forging billet, firstly heat it to 830°C, keep it warm for 7 hours, then lower the temperature to 770°C, keep it warm for 8 hours, process the forged billet to the size close to the finished product, and control the margin at 2-3mm to get the workpiece;

[0043] C. Heat the workpiece to 1050°C and keep it warm for 4 hours;

[0044] D. Use a spray quenching machine to spray water + blowing to quench the workpiece. When spraying water + blowing, the water pressure is 2MPa, the wind pressure is 2MPa, and the cooling rate is...

Embodiment 3

[0047] Embodiments 3 to 4 are the same as the above-mentioned embodiment 1, except that the size of embodiment 3 is 30mm × 55mm × 1500mm, the chemical composition and mass percentage thereof are the same as those of embodiment 1, and the size of embodiment 4 is 120mm × 1500mm. 180mm×2350mm, the chemical composition and mass percentage are the same as those in Example 2, and the different process parameters are shown in Table 1 below.

[0048] Table 1

[0049]

[0050]

[0051] After testing, the hardness and metallographic structure of the shear blades finally prepared in Examples 1-4 are shown in Table 2.

[0052] Table 2

[0053]

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Abstract

The invention discloses a heat treatment method for a shear blade, and belongs to the technical field of mechanical blade machining. The method comprises the following steps that A, a blank is prepared according to chemical components and content in technological requirements; B, the blank is subjected to isothermal spheroidization and rough machining to obtain a workpiece; C, the workpiece is subjected to water spraying and blowing quenching treatment, and after the workpiece is cooled to certain temperature, water spraying is stopped, and blowing continues to be carried out; and E, the workpiece is subjected to tempering treatment, and the shear blade is obtained. By means of the method, the cooling speed of the workpiece can be decreased, the hardness and uniformity of the shear blade can be improved, the product deformation is reduced, and the problem that cracks are likely to be produced in the using process is solved.

Description

technical field [0001] The invention relates to a method for manufacturing a shear blade, in particular to a heat treatment method for a shear blade, and belongs to the technical field of mechanical blade processing. Background technique [0002] With the continuous rapid development of rolling technology and the continuous improvement of product quality requirements, the requirements for cutting edge performance are also getting higher and higher, and the alloy content of cutting edge tool steel is getting higher and higher, especially for high-strength steel rolling. Wire. Taking the cold rolling line as an example, the main materials currently used in China are Cr12MoV, Cr12Mo1V1 or medium-carbon high-alloy materials containing W and V. Since the cutting edge requires high hardness, it is very difficult to process after quenching, the assembly hole cannot be processed, and the efficiency of surface grinding is extremely low. Therefore, it is necessary to complete the ma...

Claims

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Application Information

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IPC IPC(8): C21D1/32C21D1/18C21D9/22
CPCC21D1/18C21D1/32C21D9/22
Inventor 梁俊良党坤会梁建立陈风林辛胜朋
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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