A kind of quenching method for 20crnimo material drill bit

A technology for drill bits and workpieces, which is applied in the field of quenching for 20CrNiMo material drill bits, can solve problems affecting work efficiency, short service life, and increase production costs, and achieve the goals of reducing production costs, refining metallographic structure, and prolonging service life Effect

Inactive Publication Date: 2011-11-30
武汉钢铁重工集团冶金重工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings: it cannot completely eliminate the carbide network in the seepage layer, and it cannot refine the structure of the drill core made of 20CrNiMo, which leads to the problem of uneven and low hardness after heat treatment. The hardness rang

Method used

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  • A kind of quenching method for 20crnimo material drill bit

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of quenching method that is used for 20CrNiMo material drill bit, its step:

[0027] Do the first quench:

[0028] 1) The 20CrNiMo material drill bit workpiece is heated after carburizing, and the heating temperature is controlled at 868°C;

[0029] 2) heat preservation at 868°C for 1.5 hours;

[0030] 3) Take it out of the furnace and cool it with oil for the first time, and cool the surface temperature of the 20CrNiMo material drill bit workpiece to 100-110°C;

[0031] 4) Clean the 20CrNiMo material drill workpiece with 60°C water;

[0032] 5) Perform the first tempering, and the tempering temperature is controlled at 595°C;

[0033] 6) heat preservation at 595°C for 3 hours;

[0034] 7) Carry out natural temperature drop: 20CrNiMo material drill workpiece with natural temperature drop to 490 ~ 495 ℃ with the heating furnace;

[0035] 8) Take it out of the oven and air cool to room temperature;

[0036] Perform a second quench:

[0037] 9) The 20CrNiMo m...

Embodiment 2

[0044] A kind of quenching method that is used for 20CrNiMo material drill bit, its step:

[0045] Do the first quench:

[0046] 1) The 20CrNiMo material drill bit workpiece is heated after carburizing, and the heating temperature is controlled at 870°C;

[0047] 2) heat preservation at 870°C for 1.5 hours;

[0048] 3) Out of the furnace and oil-cooled for the first time, the surface temperature of the 20CrNiMo material drill bit workpiece is cooled to 150-165 °C;

[0049] 4) Clean the 20CrNiMo drill bit workpiece with 70°C water;

[0050] 5) Perform the first tempering, and the tempering temperature is controlled at 600°C;

[0051] 6) heat preservation at 600°C for 3.5 hours;

[0052] 7) Carry out natural temperature drop: 20CrNiMo material drill workpiece with natural temperature drop to 495 ~ 500 ℃ with the heating furnace;

[0053] 8) Take it out of the oven and air cool to room temperature;

[0054] Perform a second quench:

[0055] 9) The 20CrNiMo material drill b...

Embodiment 3

[0062] A kind of quenching method that is used for 20CrNiMo material drill bit, its step:

[0063] Do the first quench:

[0064] 1) The 20CrNiMo material drill bit workpiece is heated after carburizing, and the heating temperature is controlled at 872°C;

[0065] 2) heat preservation at 872°C for 1 hour and 45 minutes;

[0066] 3) Take it out of the furnace and cool it with oil for the first time, and cool the surface temperature of the 20CrNiMo material drill bit workpiece to 185-200°C;

[0067] 4) Clean the 20CrNiMo material drill workpiece with 75°C water;

[0068] 5) Perform the first tempering, and the tempering temperature is controlled at 605°C;

[0069] 6) heat preservation at 600°C for 4 hours;

[0070] 7) Carry out natural temperature drop: 20CrNiMo material drill workpiece with natural temperature drop to 505 ~ 510 ℃ with the heating furnace;

[0071] 8) Take it out of the oven and air cool to room temperature;

[0072] Perform a second quench:

[0073] 9) Th...

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Abstract

The invention relates to a quenching method for a 20CrNiMo material drill bit. The method comprises the following: a first quenching step, which comprises the steps of heating up a drill bit workpiece after being carburized, heat preserving, discharging from a furnace and oil cooling, washing with clear water, first tempering, heat preserving for at least three hours, naturally cooling, and discharging from the furnace and air cooling to the room temperature; and a second quenching step, which comprises the steps of second heating up the drill bit, heat preserving, discharging from the furnace and second oil cooling, extracting oil, washing with clear water, second tempering, and discharging from the furnace and air cooling to the room temperature. Due to the adoption of the two-time quenching process and a display of detected data from a test, the hardness of the workpiece of the 20CrNiMo material drill bit is uniformly distributed, the hardness value of the workpiece of the 20CrNiMomaterial drill bit reaches to Rockwell hardness 58-61, and the metallurgical structure of the workpiece of the 20CrNiMo material drill bit is further refined; moreover, the invention has the advantages of prolonging the service life of the 20CrNiMo material drill bit, increasing economic benefit, reducing replacement times and reducing production cost.

Description

technical field [0001] The invention relates to a heat treatment method for an object, in particular to a quenching method for a 20CrNiMo material drill bit. Background technique [0002] At present, the drill bits made of 20CrNiMo are all quenched once. The quenching temperature is 830-850°C, and they are kept at 830-850°C for 2 hours, and then tempered at low temperature after cooling with quenching oil. The tempering temperature is 150~180℃, keep warm for 4 hours, then take it out of the oven and air cool to room temperature. Its shortcomings: it cannot completely eliminate the carbide network in the seepage layer, and it cannot refine the structure of the drill core made of 20CrNiMo, which leads to the problem of uneven and low hardness after heat treatment. The hardness range is HRC45-60. When running at high speed, due to the large fluctuation range of its hardness value, the bearing system fails and the whole drill bit cannot be used, and its service life is short, w...

Claims

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Application Information

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IPC IPC(8): C21D9/22
Inventor 金阳
Owner 武汉钢铁重工集团冶金重工有限公司
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