Machining process capable of improving mechanical strength of thin-walled workpiece

A technology of thin-walled workpiece and processing technology, applied in the field of thin-walled workpiece processing technology, can solve the problems of easy breakage, the overall strength of the salvage tool cannot meet the mechanical strength requirements, etc., and achieve the effect of improving the mechanical strength

Active Publication Date: 2014-06-18
MUDANJIANG CITY LINHAI PETROLEUM REFLOATATION INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high hardness requirements for special parts such as fishing teeth of fishing tools, it is necessary to carbonitrid and then quench the fishing tools during processing. However, due to the thin wall thickness of fishing tools, the carbonitriding layer will Approaching or reaching the center of the workpiece, due to the thinner or lost toughness layer at the center, the overall strength of the fishing tool cannot meet the mechanical strength requirements, so that the thin-walled fishing tools produced by the existing technology are easily broken during the fishing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] During heat treatment carbonitriding, increase the temperature in the carburizing furnace to 830-860°C to transform ferrite and pearlite into austenite, and keep the temperature at 830-860°C for 9 hours to make the thickness of the carbonitriding layer reach 1.0mm;

[0016] During heat treatment and quenching, the heating furnace is heated to 790°C, and then the through-fired workpiece is quickly put into 30°C PAG quenching liquid for quenching and cooling;

[0017] During heat treatment and low-temperature tempering, put the quenched workpiece into a heating furnace and heat it to 170°C for 3.5 hours for low-temperature tempering.

Embodiment 2

[0018] Example 2: During heat treatment of carbonitriding, increase the temperature in the carburizing furnace to 830-860°C to transform ferrite and pearlite into austenite, and keep the temperature at 830-860°C for 10 hours to increase the thickness of the carbonitriding layer up to 1.2mm;

[0019] During heat treatment and quenching, the heating furnace is heated to 780°C, and then the through-fired workpiece is quickly put into the PAG quenching liquid at 40°C for quenching and cooling;

[0020] During heat treatment and low-temperature tempering, put the quenched workpiece into a heating furnace and heat it to 160°C for 4 hours for low-temperature tempering.

Embodiment 3

[0021] Example 3: During heat treatment of carbonitriding, increase the temperature in the carburizing furnace to 830-860°C to transform ferrite and pearlite into austenite, and keep the temperature at 830-860°C for 8 hours to increase the thickness of the carbonitriding layer up to 0.8mm;

[0022] During heat treatment and quenching, the heating furnace is heated to 800°C, and then the through-fired workpiece is quickly put into the PAG quenching liquid at 20°C for quenching and cooling;

[0023] During heat treatment and low-temperature tempering, put the quenched workpiece into a heating furnace and heat it to 180°C for 3 hours for low-temperature tempering.

[0024] Taking oil fishing tools as an example, because the raw material of the workpiece is low-carbon alloy steel, and the wall of the workpiece is relatively thin, if the whole is machined and formed at one time, there will be carbonitriding layers on both sides of the thin wall during carbonitriding, making the cor...

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Abstract

The invention relates to a machining process capable of improving the mechanical strength of a thin-walled workpiece. During once machining, a part of the thin-walled workpiece, which needs carbonitriding for improving hardness, is once machined and formed, a machining allowance with the thickness more than the thickness of a carbonitriding layer is reserved on the rest parts, the workpiece is subjected to carbonitriding, then the reserved machining allowance is removed through machining, and finally, the thin-walled workpiece is quenched and tempered. According to the machining process, the hardness requirement of a special part of the thin-walled workpiece can be ensured, the flexibility requirement of the thin-walled workpiece can also be ensured, and the integral mechanical strength of the thin-walled workpiece can be greatly improved. The low-carbon alloy thin-walled workpiece is prevented from being broken due to overhigh integral hardness (the carbonitriding layer approaches or reaches the core part and a core flexible layer is thinner or a flexible layer is lost) after carbonitriding and quenching, thus the workpiece is improved in flexible layer thickness and integral flexibility on the premise of ensuring the thickness and hardness of the carbonitriding layer.

Description

technical field [0001] The invention relates to a processing technology, in particular to a processing technology for a thin-walled workpiece. Background technique [0002] With the continuous development of drilling technology and the increase of human demand for energy, the difficulty of drilling and handling accidents is also increasing. To deal with accidents under special conditions, special tools for dealing with accidents are required. They must not only meet the requirements of special underground conditions but also have necessary mechanical properties, which puts forward higher requirements for the processing technology of special tools. Take the fishing of fish in the well as an example. The fishing tool is a thin-walled workpiece. If the wall thickness of the fishing tool is greater than the gap between the fish and the well wall, or greater than the inner diameter of the fish and the outer diameter of the mandrel of the fishing tool Therefore, the wall thicknes...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C21D8/00C21D1/28C21D1/18C23C8/22
Inventor王磊李想杨桂清
OwnerMUDANJIANG CITY LINHAI PETROLEUM REFLOATATION INSTR