Disk-type shear knife and its heat treating technology

Abstract

A disk-type shear knife is made up of No.45 steel with carbon content of 0.45-0.50%. Its heat treating technology features quenching at 850-870 deg.C for 2-3 min / mm, cooling agent, circulating water and tempering at 300-320 deg.C for 8-15 min / mm.

Description

Technical field:

[0001] The invention relates to material selection and manufacturing process of disc scissor blades. Background technique:

[0002] The disc scissor blades used for stripping of slitting machines are generally made of alloy tool steel, and the commonly used material is 9sicr steel. Product requirements hardness H RC 48-52. The heat treatment process of alloy tool steel to manufacture disc scissors is very complicated. It must first undergo preliminary heat treatment including: spheroidizing annealing, normalizing, low temperature annealing, quenching and tempering, and then quenching. The cooling medium is oil. Disc scissors made of 9sicr steel, although the hardness can reach H RC More than 50, but the process is complicated and the manufacturing cost is high. Invention content:

[0003] The object of the present invention is to overcome the disadvantages of the prior art, and provide a method for manufacturing disc scissors, which simplifies the manu...

Examples

example 1

[0009] Example 1, diameter 352mm, thickness 20mm disc scissor blade, material 45 steel, chemical composition (%): carbon 0.45, silicon 0.35, manganese 0.70. The steel billet is made by forging, rough machining, quenching and tempering treatment, and finishing process. Quenching and tempering process: quenching temperature: 850°C, holding time: 40 minutes, water cooling (circulating water); tempering temperature: 320°C, holding time: 160 minutes .

example 2

[0010] Example 2, 320 millimeters in diameter, 15 millimeters of thickness disc scissors, material 45 steel, chemical composition (%): carbon 0.50, silicon 0.37, manganese 0.80. The steel billet is made by forging, rough machining, quenching and tempering treatment, and finishing process. Quenching and tempering process: quenching temperature: 870 ° C, holding time: 45 minutes, water cooling (circulating water); tempering temperature: 320 degrees, holding time: 225 minutes .

example 3

[0011] Example 3, 180 millimeters in diameter, 10 millimeters of thickness disc scissors, material 45 steel, chemical composition (%): carbon 0.48, silicon 0.30, manganese 0.60. The steel billet is made by forging, rough machining, quenching and tempering treatment, and finishing process. Quenching and tempering process: quenching temperature: 860°C, holding time: 25 minutes, water cooling (circulating water); tempering temperature: 310°C, holding time: 100 minutes .

Technical field:

[0001] The invention relates to material selection and manufacturing process of disc scissor blades. Background technique:

[0002] The disc scissor blades used for stripping of slitting machines are generally made of alloy tool steel, and the commonly used material is 9sicr steel. Product requirements hardness H RC 48-52. The heat treatment process of alloy tool steel to manufacture disc scissors is very complicated. It must first undergo preliminary heat treatment including: spheroidizing annealing, normalizing, low temperature annealing, quenching and tempering, and then quenching. The cooling medium is oil. Disc scissors made of 9sicr steel, although the hardness can reach H RC More than 50, but the process is complicated and the manufacturing cost is high. Invention content:

[0003] The object of the present invention is to overcome the disadvantages of the prior art, and provide a method for manufacturing disc scissors, which simplifies the manu...

Examples

example 1

[0009] Example 1, diameter 352mm, thickness 20mm disc scissor blade, material 45 steel, chemical composition (%): carbon 0.45, silicon 0.35, manganese 0.70. The steel billet is made by forging, rough machining, quenching and tempering treatment, and finishing process. Quenching and tempering process: quenching temperature: 850°C, holding time: 40 minutes, water cooling (circulating water); tempering temperature: 320°C, holding time: 160 minutes .

example 2

[0010] Example 2, 320 millimeters in diameter, 15 millimeters of thickness disc scissors, material 45 steel, chemical composition (%): carbon 0.50, silicon 0.37, manganese 0.80. The steel billet is made by forging, rough machining, quenching and tempering treatment, and finishing process. Quenching and tempering process: quenching temperature: 870 ° C, holding time: 45 minutes, water cooling (circulating water); tempering temperature: 320 degrees, holding time: 225 minutes .

example 3

[0011] Example 3, 180 millimeters in diameter, 10 millimeters of thickness disc scissors, material 45 steel, chemical composition (%): carbon 0.48, silicon 0.30, manganese 0.60. The steel billet is made by forging, rough machining, quenching and tempering treatment, and finishing process. Quenching and tempering process: quenching temperature: 860°C, holding time: 25 minutes, water cooling (circulating water); tempering temperature: 310°C, holding time: 100 minutes .