Annealing process control for heat treatment process

Application of annealing process control in heat treatment process

Introduction: gas detection is very important for process safety and product quality safety. In the all-hydrogen production process, the measurement data of oxygen content can not only prevent safety hazards but also prevent oxidation of products. The technical team of wuhan huamin provides a set of effective solutions for customers.

Cause analysis,

This company is an enterprise producing copper strip. Due to the lack of effective online atmosphere control equipment, it often appears in the production process:

1) the finished copper strip has uneven color and obvious color difference.

2) on-site technicians shall adjust the atmosphere based on experience.

3) hidden safety problems exist in the production process.

Equipment and process

Furnace process: after putting the copper plate into the furnace, start to lower the furnace cover → vacuum the furnace → wash the furnace with nitrogen → fill with hydrogen → heat up (up to 700 degrees) → water cooling → vacuum → fill with nitrogen → exhaust → come out of the oven. Low temperature: low temperature (100 degrees)

Customer doubt

1. What is the reason for the color difference from the perspective of heat treatment process? Is it hydrogen impure? Or is it because of oxygen interference?

2. Are the oxygen and hydrogen contents obtained by experience correct?

3.20 hours non-stop furnace special process, how to real-time and efficient measurement?

The solution

The portable hydrogen analysis system was used for preliminary analysis: when the temperature in the furnace rose to 430 degrees, the hydrogen content value of the furnace was tested, and the data value of hydrogen was tested in the range of 98% to 99.99%. It is consistent with the expected value, and there is no problem with the process.

Comprehensive analysis: this company's process is special, annealing needs 20 hours, only portable can only in a short time, the test of the whole process of a certain section of the process, it is difficult to be representative, if there are abnormal products in the furnace, it is difficult to analyze from a certain point. If the heat treatment furnace condition monitoring system is adopted, the whole production process from feeding to discharging can be detected, while the curve trend of data can be observed. In the later stage, big data analysis can be carried out through the data of one or more furnaces. If the product is abnormal, it can be reflected directly on the curve.

Let the heat treatment technologist can find the abnormal operation of furnace gas in time, and deal with it in the first time, so as to facilitate the adjustment and monitoring of the new process, thus reducing the cost of manpower and material resources. Simplified, simple and easy to measure.