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How to measure the hardened layer of high frequency quenching

by:Kehua     2022-07-22
In the process of high-frequency quenching, it is necessary to complete the measurement of relevant data. Among them, the depth of the hardened layer of high-frequency quenching is a very necessary data to measure. So, how to measure the depth of the high-frequency quenching hardened layer? Let's learn the specific method together. High-frequency quenching hardened layer 1. High-frequency quenching Kehua pointed out that high-frequency quenching is mostly used for surface quenching of industrial metal parts. Induction heating equipment, that is, equipment for induction heating of workpieces for surface quenching. The principle of induction heating: The workpiece is placed in the inductor, and the inductor is generally a hollow copper tube inputting intermediate frequency or high frequency alternating current (1000-300000Hz or higher). The alternating magnetic field generates an induced current of the same frequency in the workpiece. The distribution of this induced current in the workpiece is uneven, it is strong on the surface, but weak in the interior, and it is close to 0 in the center. This skin effect is used. , the surface of the workpiece can be heated rapidly, the surface temperature rises to 800-1000 ℃ in a few seconds, and the temperature of the core part is very small. 2. Quenching Kehua believes that the quenching of steel is to heat the steel to a temperature above the critical temperature Ac3 (hypo-eutectoid steel) or Ac1 (hyper-eutectoid steel), keep it for a period of time, make it all or part of austenite, and then heat it to a temperature greater than The cooling rate of the critical cooling rate is a heat treatment process in which the cooling rate is rapidly cooled below Ms (or isothermal near Ms) to perform martensite (or bainite) transformation. The solution treatment of aluminum alloy, copper alloy, titanium alloy, tempered glass and other materials or the heat treatment process with rapid cooling process is also called quenching. High-frequency quenching and hardening layer 3. How to detect the depth of high-frequency quenching and hardening layer At present, two countries have developed a quenching layer depth detector, which is non-destructive and persistent. Just take the equipment to test, and the data will be displayed immediately. These two products are: The Fraunhofer Institute for Nondestructive Testing in Germany is a fast non-destructive measuring instrument for the depth of quenching hardened layer, which is widely recognized by the industry. It uses a fast non-destructive ultrasonic method to measure the depth of induction hardening layer. This approach reduces inspection effort and costs, and ensures consistently high quality products through timely adjustments to the production process. The hardened layer depth gauge is an epoch-making device developed by Kobelco Inspection Service, which can measure the hardened layer depth without cutting. Hardening and quenching depth measuring device HARD ECHO is an epoch-making detection device that uses the principle of ultrasonic scattering echo to measure the depth of surface hardening and quenching layer. Select the appropriate probe, holder and measurement conditions to be able to distinguish the hardened metal from the base metal, so that the depth of the hardened layer can be measured non-destructively, and the depth value is displayed numerically. SH-67 Hardened Layer Depth Thickness Gauge is suitable for large gears, rotary ring teeth, crankshafts and other large parts that are subjected to medium and high frequency quenching surface hardening treatment. It has been used in the market for more than ten years. It is a simple and flexible , Convenient, durable and practical special-purpose instrument. The method of measuring the depth of the high-frequency quenching hardened layer has been summarized. As long as you use the measuring instrument, you can easily measure the depth of the quenched and hardened layer. Have you mastered it well?
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