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Blast drill bit heat treatment process

A drill and process technology, applied in heat treatment furnaces, heat treatment equipment, metal material coating processes, etc., can solve problems such as failure to meet customer requirements, and achieve the effects of increased strength, increased toughness, and high hardness

Active Publication Date: 2017-08-29
长沙天和钻具机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The company has been using this kind of alloy structural steel since 2014. According to the heat treatment process introduced in the patent literature, it has prepared drill bits for blasting. After actual use, it is found that the cumulative drilling depth of the drill bits is about 220 meters on average, which is higher than that of the original drill bits produced by the company. The service life has been improved by about 20%, but it still cannot meet the requirements of customers

Method used

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  • Blast drill bit heat treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A heat treatment process for a drill bit for blasting, comprising the steps of:

[0038] Prepare the material components of the drill blank, which is composed as follows by mass percentage:

[0039] C 0.25, Si 1.45, Mn 1.3, Cr 0.5, Ni 1.8, Mo 0.6, V 0.2, S ≤0.01, P ≤0.015, Cu ≤0.2, the balance is Fe;

[0040] Carburize the surface of 10 drill bits after finish turning at 910°C for 8 hours, and the dripping speed of carburizing medium is 135 grains / min; then, diffuse for 5 hours, and the dripping speed of carburizing medium is 45 grains / min ; Cool to 850°C with the furnace, keep warm for 90 minutes, and quench the oil out of the furnace to 180°C and air cool;

[0041] The second step: secondary quenching

[0042] Put the workpiece obtained in the first step at 810°C for 80 minutes, take it out of the furnace and quench it with oil to 360°C, then place it in a salt bath and cool it down to 180°C at a cooling rate of 1-2°C / min, then cool it naturally in the air to room ...

Embodiment 2

[0044] A heat treatment process for a drill bit for blasting, comprising the steps of:

[0045] Prepare the material components of the drill blank, which is composed as follows by mass percentage:

[0046] C 0.25, Si 1.45, Mn 1.3, Cr 0.5, Ni 1.8, Mo 0.6, V 0.2, S ≤0.01, P ≤0.015, Cu ≤0.2, the balance is Fe;

[0047] Carburize the surface of 10 drill bits after finish turning at 920°C for 7 hours, and the dripping speed of carburizing medium is 140 grains / minute; then, diffuse for 3 hours, and the dripping speed of carburizing medium is 30 grains / min ; Cool to 840°C with the furnace, keep warm for 60 minutes, and quench the oil out of the furnace to 200°C and air cool;

[0048] The second step: secondary quenching

[0049] Put the workpiece obtained in the first step at 840°C for 60 minutes, take it out of the furnace and quench it with oil to 400°C, then place it in a salt bath and cool it down to 200°C at a cooling rate of 2-3°C / min, then cool it naturally in the air to room...

Embodiment 3

[0051] A heat treatment process for a drill bit for blasting, comprising the steps of:

[0052] Prepare the material components of the drill blank, which is composed as follows by mass percentage:

[0053] C 0.25, Si 1.45, Mn 1.3, Cr 0.5, Ni 1.8, Mo 0.6, V 0.2, S ≤0.01, P ≤0.015, Cu ≤0.2, the balance is Fe;

[0054] Carburize the surface of 10 drill bits after finish turning at 930°C for 6 hours, and the carburizing medium dripping speed is 100 grains / min; then, diffuse for 2 hours, and the carburizing medium dripping speed is 18 grains / min ; Cool to 820°C with the furnace, keep warm for 20 minutes, and quench the oil out of the furnace to 220°C and air cool;

[0055] The second step: secondary quenching

[0056] The workpiece obtained in the first step is kept at 860°C for 120 minutes, and oil-quenched to 450°C, then placed in a salt bath and cooled to 220°C at a cooling rate of 4-5°C / min, and then naturally cooled in the air to room temperature.

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Abstract

Disclosed is a blast drill bit heat treatment process. Surface carburizing is performed at the temperature between 910 DEG C and 930 DEG C, then cooling with furnace is performed till the temperature reaches 820 DEG C to 860 DEG C, heat preservation is performed, furnace discharging and oil quenching are performed till the temperature reaches 180 DEG C to 220 DEG C, and oil discharging and air cooling are performed; and then temperature equalization is performed at the temperature between 810 DEG C and 860 DEG C, the temperature is decreased to 350 DEG C to 450 DEG C at the cooling speed being 100 DEG C-150 DEG C per minute, then the temperature is decreased to 180 DEG C to 220 DEG C at the cooling speed being 1 DEG C-5 DEG C per minute, and natural cooling is performed in air. The blast drill bit heat treatment process is simple and reasonable, the material subjected to heat treatment has the structure with the surface possessing lower bainite and a little cryptocrystalline martensite and the core possessing upper bainite and a little lath martensite, the surface strength and hardness are high, the abrasion resistance is achieved, the impact toughness is high, the core toughness is good, and the structural stress is small; and as for the material subjected to heat treatment, the strength is slightly improved, the toughness is substantially improved, the requirement of the service conditions of drill tools for blasting is met, the material is resistant to abrasion and can bear repeated and circulating heavy impact load, and the service life of the drill tools is substantially prolonged.

Description

technical field [0001] The invention discloses a drill bit heat treatment process for blasting, which belongs to the technical field of drill heat treatment process. Background technique [0002] The hole depth of the blast hole (granite, wind pressure 20 MPa) is generally about 150-200 meters, and the hole depth is relatively small. Therefore, the drill bit used for blast hole drilling is usually required to have certain strength and good fatigue resistance. Impact performance, can be used repeatedly to improve drilling smoothness. [0003] The company has been using Xining XGQ25 material to prepare blasting drill bits, material composition: C: 0.22-0.27, Si: 1.4-1.8, Mn: 1.35-1.75, Cr: 0.25-0.55, Ni: 1.5-1.9, Mo: 0.3- 0.5, V: 0.1-0.2, the heat treatment process is: quenching 820 ℃ -840 ℃ oil quenching to 200 ℃ oil outlet air cooling; this kind of drill, its performance is high strength, hardness, poor fatigue impact toughness, and because of the The carburizing performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C21D1/18C21D9/22C22C38/02C22C38/04C22C38/44C22C38/46C22C38/42
CPCC21D1/18C21D9/22C21D2211/002C21D2211/008C22C38/02C22C38/04C22C38/34C22C38/42C22C38/44C22C38/46C23C8/22
Inventor 张秀丽贺羽
Owner 长沙天和钻具机械有限公司
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