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Inspection item after quenching process of induction heating and quenching workpiece parts

Induction heating quenching: Induction heating is extremely fast, and it usually takes only a few seconds or ten seconds to heat the workpiece material. The quenched layer has a fine martensite structure and good mechanical properties. The surface of the workpiece is not easy to be oxidized and decarburized, the deformation is small, and the hardness and depth of quenching can be controlled. The medium and high frequency quenching equipment has stable quality and simple operation. It is not only suitable for small batch production of small and medium-sized production enterprises, but also can be used with automatic equipment. Mass production. Commonly used in medium carbon steel or medium carbon low alloy steel workpieces, such as 45, 40Cr, 40MnB and so on. It can also be used for high carbon tool steel or cast iron. When the depth of hardened layer of general parts is about 1/10 of the radius, a good fit of strength, fatigue resistance and toughness can be obtained.

Then, after inductively heating the quenched parts, what items are generally checked by the quality inspection after the quenching process is completed?
Inspection item after quenching process of induction heating and quenching workpiece parts

(1) Workpiece appearance product quality

 The appearance quality of the quenched surface of the workpiece parts cannot be defects such as melting, cracking and cracking, and is usually visible to the naked eye. The normally quenched surface is beige with a grayish black (oxidized). Gray indicates that the quenching temperature is too high; all black or blue on the surface usually indicates insufficient quenching temperature (insufficient heating time, insufficient machine power). Localized melting and obvious crack cracking, caving, and falling angles can be detected during visual inspection. For small batches and batch production parts, the visual inspection rate is 满负荷. For the strict requirements on the shape, reference should be made to Article 5.

 (2) hardness

 The Rockwell hardness tester can be used for sampling inspection. The sampling rate is determined by the importance of the workpiece parts and the process stability, usually 3% to 10%, supplemented by boring inspection or 满负荷 boring inspection. When inspecting the file, the inspector needs to have extensive experience and compare the standard hardness blocks of different hardnesses to improve the accuracy of the file inspection. In conditional automated production, the more advanced hardness inspection method has been selected on a flow-by-piece inspection basis such as an eddy current tester. Highly demanding workpiece products require professional instrument testing.

 (3) Hardened area

 For locally hardened workpiece parts, the size and location of the quenched area need to be checked. Small batch production often uses a ruler or vernier caliper to accurately measure, or it can be used to corrode the quenched surface with strong acid to make it appear white hardened area for product inspection. The etching method is often used to adjust the test. In mass production, if the sensor or the equipment for controlling quenching is very reliable, usually only sampling, the sampling rate is 1% to 3%.

 (4) Hardened layer depth
 At present, the depth of the hardened layer is mostly selected by the method of cutting and quenching parts to accurately measure the depth of the hardened layer of the part. So far, in the past, the metallographic analysis method has been used in the past to accurately measure the depth of the hardened layer. In the future, GB 5617-85 will be implemented to accurately measure the depth of the hardened layer. Because the hardened layer depth inspection also needs to destroy the parts, it is usually only sampled except for special parts and special requirements. Large-volume production of small parts can be used to sample one piece per class or to inspect one piece of workpiece per point of production. Large parts can be sampled and sampled every month. When using advanced non-breaking test equipment, the sampling rate can be increased, even 满负荷. For example, the surface of the workpiece allows for the indentation of the Leeb hardness tester, which can be done by using a Leeb hardness tester.
(5) Deformation deflection
 Deformation is a common problem often encountered in quenching, especially on some small workpiece parts, the requirement of which is relatively high, the temperature or heating time is different by one second, the effect has different differences.
Deformation and deflection mainly check the shaft parts. Usually, the center frame and the dial indicator are used to accurately measure the difference or deflection of the parts after quenching. The sway difference varies depending on the length and length to diameter ratio of the part, and the induction hardened part can be straightened, and the amount of deflection can be slightly larger. The usually allowed pendulum difference is related to the amount of grinding after quenching. The smaller the amount of grinding, the smaller the allowable pendulum difference. 4至1毫米。 The diameter of the shaft is usually 0. 4 ~ 1mm. 5至0. 3mm。 The slanting value of the 0. 15~0. 3mm.
(6) Crack cracking
 The more important parts need to be inspected by magnetic particle inspection after quenching. The factories with better equipment have used phosphors to show cracks. Parts that have been magnetically flawed should be demagnetized before being sent to the next process.

Dongguan Haituo Electromechanical Equipment Co., Ltd. is a manufacturer of medium and high frequency induction heating equipment developed earlier in China. It is a high-tech private enterprise specializing in R&D, design, manufacturing, sales and service. enterprise. With a strong technical R & D team, experienced, customized automatic induction heating equipment according to the workpiece and process, free to provide customers with personalized process solutions. As well as a comprehensive after-sales service system in various parts of the country, we have won the trust of many famous domestic enterprises, and have the experience of providing quality products and services to them. Welcome to visit the company.
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