Heat treatment technology for hollow jackrod

A technology of normalizing heat treatment and drill rod, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of increasing rock drilling costs and affecting rock drilling efficiency, and achieves the advantages of overcoming early fracture, convenient application and low production cost. Effect

Inactive Publication Date: 2017-05-31
QINGDAO XINHEYI IND & TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increase rock drilling cost and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0008] The present invention is a hollow drill rod heat treatment process, which uses a continuous feeder to normalize the rolled 40SiMnCrNiMo hollow drill rod. The heating furnace adopts a continuous flame heating furnace. Including the following processes:

[0009] Preheating: The hollow drill rod directly enters the first section of the heating furnace on the feeding frame, and is heated at an average temperature rise of 20°C / min in the first section of the hot zone. Finally, the drill rod is heated to 780°C ±10 ℃;

[0010] Diathermy: After the drill rod is heated to 780℃±10℃, it enters the second section of the heating zone through the feeding frame. In the second section of the heating zone, the heating furnace maintains a temperature of 780℃±10℃ to dilute the drill rod , After 50 minutes of diathermy, it will be out of the furnace through the feeding rack;

[0011] Nitrogen cooling: the drill rod after the furnace is cooled by nitrogen on the feeding frame, after cooling for...

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PUM

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Abstract

The invention relates to a heat treatment technology for a hollow jackrod, and belongs to heat treatment technologies. The heat treatment technology is characterized by performing preheating, diathermy, nitrogen cooling and slow cooling treatment on a rolling state 40 SiMnCrNiMo hollow jackrod by a heating furnace through a feeding frame to complete normalizing heat treatment and controlled cooling of the jackrod, so that the jackrod obtains an appropriate metallographic structure, and the mechanical properties of shock resistance and fatigue resistance are improved; 30% of the energy resources is saved; and the lifelong footage meter of the jackrod is increased by one time.

Description

technical field [0001] The invention belongs to a heat treatment process, in particular to a process for normalizing heat treatment of a hollow drill rod. Background technique [0002] The drill rod for rock drill is one of the tools for rock drilling with rock drilling machinery. Its structure is composed of drill tail, drill shoulder, rod body and drill tip. Long rods. Generally, the drill rod is used directly as a drill rod material after rolling, or incompletely normalized with an intermediate frequency sensor. The mechanical performance of the drill rod in the rolled state is poor in impact resistance and fatigue resistance; the performance of the drill rod is improved by normalizing the intermediate frequency sensor, but the heating time is short, the structure has not been fully transformed, and the hardness of each part is different. The mechanical properties of fatigue still cannot meet the requirements of use, and the cost is high in mass production. [0003] Du...

Claims

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Application Information

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IPC IPC(8): C21D1/28C21D1/84C21D9/00
CPCC21D1/28C21D1/84C21D9/0075
Inventor 吴佳
Owner QINGDAO XINHEYI IND & TRADE CO LTD
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