Whole process variable pressure controlled carburation method

A variable voltage control, whole process technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problems affecting the comprehensive mechanical properties of parts, large fluctuations in product quality, grain growth, etc. Achieve the effect of shortening the production process cycle, considerable economic benefits, and reducing carburizing costs

Inactive Publication Date: 2005-06-08
ZHONGYUAN ENGINEERING COLLEGE
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  • Description
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Problems solved by technology

For example, increasing the carburizing temperature may promote grain growth, which directly affects the comprehensive mechanical properties of the part
However, the use of infiltration technology has high cost and poor repeatability, and the product quality fluctuates greatly.

Method used

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  • Whole process variable pressure controlled carburation method

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Embodiment Construction

[0011] Such as figure 1 As shown, the whole process of carburizing in the present invention includes a ventilation stage, a strong infiltration stage, a diffusion stage, and a cooling and quenching maintenance stage. The figure shows the process parameters and pressure value control range of each stage.

[0012] The carburizing technology operation steps of the whole process pressure change control of the present invention: as shown in the pressure change carburizing process curve of the accompanying drawing:

[0013] 1. During the ventilation period, after the parts are installed in the furnace, the temperature is raised to 880°C, and the amount of kerosene drops is increased, and the sample hole and the exhaust hole valve are opened at the same time to speed up the ventilation process.

[0014] 2. In the strong infiltration period, when the carbon potential (CP value) of the atmosphere reaches above 1.1, close all exhaust valves, adjust the drop rate of kerosene to 260-340d...

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Abstract

A carbonizing method with variable-pressure control in whole procedure for high carbonizing quality features that above the carbonizing furnace, the high-flow kerosene drip method is used to increase the positive pressure in furnace for generating high-activity high-carbon atmosphere and high furnace pressure, which can speed up the carbonizing on the surface of workpiece, and the furnace pressure can be regulated for controlling the carbonized depth, hardness and metallographic structure of workpiece.

Description

1. Technical field: [0001] The invention belongs to a new heat treatment carburizing technology, and in particular relates to a carburizing method capable of ensuring rapid carburizing with high carburizing quality and a whole-process pressure change control. 2. Background technology: [0002] Carburizing is a surface hardening technique widely used in industry. Carburizing is divided into gas carburizing, liquid carburizing and solid carburizing, among which gas carburizing has the advantages of controllable carbon potential, high productivity, good working conditions and direct quenching, and is widely used in carburizing industry. application. The carburized workpiece made of special carburized steel should meet the following technical requirements after carburizing: (1) The surface hardness should not be lower than HRC60. (2) The surface layer and the fracture at the center should be fine grained. (3) The microstructure of the carburized layer should be composed of fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/20
Inventor 汤峰
Owner ZHONGYUAN ENGINEERING COLLEGE
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