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Heat treatment method of 40CrNi2MoV-made high-wind-pressure DTH (down-the-hole) drill bit and DTH drill bit

A heat treatment method and down-the-hole technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as failure to meet engineering requirements, achieve good mechanical properties and plasticity, high material utilization, and improve mechanical properties.

Active Publication Date: 2018-12-25
长沙超金刚机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the acceleration of project implementation speed, higher drilling efficiency requirements, and stricter environmental protection requirements, the existing high-pressure down-the-hole drill bits have obviously failed to meet engineering requirements.

Method used

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  • Heat treatment method of 40CrNi2MoV-made high-wind-pressure DTH (down-the-hole) drill bit and DTH drill bit
  • Heat treatment method of 40CrNi2MoV-made high-wind-pressure DTH (down-the-hole) drill bit and DTH drill bit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Reference attached figure 1 and figure 2 , the figure shows the structure when the blank of the high wind pressure down-the-hole drill provided by the embodiment of the present invention is put into the forging die of the down-the-hole drill at the beginning and end of forging.

[0031] A heat treatment method for a 40CrNi2MoV high wind pressure down-the-hole drill bit provided in this embodiment, the heat treatment method includes the following steps:

[0032] S1, steel ingot forming: Melt pre-selected steel raw materials into ladle water, clean the inner surface of the steel ingot forming mold, hang mold slag in the steel ingot forming mold at a distance of 15mm to 25mm from the bottom of the forming mold, and then pour molten steel into the steel ingot forming In the mold, the molten steel temperature is controlled at 1550°C to 1570°C during pouring, and the formed round steel ingot is cooled to below 300°C for demoulding. Wherein, the addition amount of the mold ...

Embodiment 2

[0040] A heat treatment method for a 40CrNi2MoV high wind pressure down-the-hole drill bit provided in this embodiment, the heat treatment method includes the following steps:

[0041] S1, steel ingot forming: Melt pre-selected steel raw materials into ladle water, clean the inner surface of the steel ingot forming mold, hang mold slag in the steel ingot forming mold at a distance of 18mm to 20mm from the bottom of the forming mold, and then pour molten steel into the steel ingot forming In the mold, the molten steel temperature is controlled at 1555°C to 1565°C during pouring, and the formed round steel ingot is cooled to below 280°C for demoulding. Wherein, the amount of mold flux added is 2.2Kg-2.7Kg / ton according to the mass of the round steel ingot formed by casting.

[0042] S2, round steel forging: the round steel ingot formed in S1 is forged and upset at 610°C-630°C, the forging ratio is controlled at 4-6, and the forged round steel is put back immediately when it cool...

Embodiment 3

[0049] A heat treatment method for a 40CrNi2MoV high wind pressure down-the-hole drill bit provided in this embodiment, the heat treatment method includes the following steps:

[0050] S1, steel ingot forming: Melt the pre-selected steel raw materials into ladle water, clean the inner surface of the steel ingot forming mold, hang mold slag in the steel ingot forming mold at a distance of 18.5mm~19mm from the bottom of the forming mold, and then pour molten steel into the steel ingot In the forming mold, the molten steel temperature is controlled at 1560°C during pouring, and the formed round steel ingot is cooled to below 260°C for demoulding. Wherein, the amount of mold slag added is 2.35Kg-2.45Kg / ton according to the mass of the cast round steel ingot.

[0051] S2, round steel forging: the round steel ingot formed in S1 is forged and upset at 625°C, the forging ratio is controlled at 4.5-5.5, and the forged round steel is immediately put into the annealing furnace for anneal...

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Abstract

The invention discloses a heat treatment method of a 40CrNi2MoV-made high-wind-pressure DTH (down-the-hole) drill bit. The heat treatment method comprises steps as follows: a raw steel material is smelted into liquid steel to be poured into a steel ingot forming die, and a round steel ingot is formed; the round steel ingot is subjected forging and upsetting at 600-650 DEG C, and is immediately putin an annealing furnace for annealing when cooled to 250-300 DEG C; the forged round steel is drawn out, a DTH drill bit blank with a large end and a small end is formed, and the DTH drill bit blankis heated and put in a DTH drill bit blank forging die for forge forming; the DTH drill bit after forge forming is subjected to normalizing two times and then is tempered; the DTH drill bit subjectedto the normalizing two times is quenched for 1-2 h at 850-870 DEG C and then is subjected to oil cooling to reach the normal temperature; the DTH drill bit is subjected to medium-temperature temperingand naturally cooled to the normal temperature. The invention further discloses the 40CrNi2MoV-made high-wind-pressure DTH drill bit. With the adoption of the material selection and forging technology, the high-wind-pressure DTH drill bit has good mechanical properties and plasticity; longitudinal and transverse performance anisotropy of the drill bit is reduced with the stretching and upsettingforging technology; perfect forging flow line distribution is obtained.

Description

technical field [0001] The present invention relates to the technical field of heat treatment of drill bits, and more specifically, relates to a heat treatment method for a 40CrNi2MoV high-pressure down-the-hole drill bit, and a high-pressure down-the-hole drill bit manufactured by the heat treatment method. The drill bit is mainly used in construction , roads, mines, tunnels and other engineering constructions to break rocks, excavate blasting and drilling, etc. Background technique [0002] High wind pressure down-the-hole drill bits are widely used in blasting projects in mines, hydropower stations, ports, roads and tunnels, etc., for breaking rocks, earthwork, and drilling blasting holes. The down-the-hole drill bit has the characteristics of high impact, strong wear resistance and fast rotation speed during use. The pressure used by the large-scale high-pressure down-the-hole drill bit is higher, so the requirements for the toughness, wear resistance and hardness of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C21D1/28C21D1/18C21D9/22C21D1/26C23C8/22
CPCC21D1/18C21D1/26C21D1/28C21D8/005C21D9/22C23C8/22
Inventor 相仁发谢艳云
Owner 长沙超金刚机械制造有限公司