The first is the raw material inspection link. Raw materials are the basis of the quality of stamping parts home appliance parts processing, and their quality has a decisive influence on the final product. When receiving raw materials, their specifications, models, material certification and other documents must be strictly checked to ensure that they meet the production requirements. Through chemical composition analysis, the elemental composition of the raw materials is detected to determine whether they meet the standard requirements. For example, the content of carbon, manganese, sulfur and other elements in steel, if exceeded the standard range, will affect the strength, toughness and other properties of the stamping parts. At the same time, the microstructure of the raw materials is observed using a metallographic microscope to evaluate its grain size, uniformity, etc. Unqualified organizational structures may cause cracking, deformation and other problems during the stamping process. Only when the various indicators of the raw materials meet the standards can they be put into subsequent production and the quality of stamping parts can be controlled from the source.
The next step is the first piece inspection link. When the stamping equipment is debugged and production begins, the inspection of the first stamping part is particularly critical. The first piece inspection is a comprehensive verification of the mold debugging effect, equipment operation status and process parameter settings. According to the design drawings and technical requirements, the inspectors will comprehensively measure the dimensional accuracy of the first piece, including key dimensions such as length, width, thickness, and aperture, and use precision measuring tools such as vernier calipers and micrometers to ensure that the error is within the specified tolerance range. In addition to the size, the appearance quality of the stamping parts home appliance parts processing will also be checked to see if there are defects such as cracks, burrs, dents, and scratches. If the first piece inspection fails, it is necessary to adjust the mold and equipment parameters or optimize the process in time until the first piece meets the quality standards before mass production can be carried out to avoid a large number of unqualified products due to problems such as equipment and molds.
In the process of mass production, process inspection is an important means to ensure the stability of product quality. Process inspection adopts the method of random inspection, and stamping parts are sampled for inspection at a certain time interval or production quantity interval. The inspection content covers dimensional accuracy, appearance quality and performance testing. In terms of dimensional accuracy, key dimensions that are prone to deviation will be repeatedly measured, and the measurement data will be compared to analyze the trend of dimensional changes. If it is found that the dimensional fluctuation exceeds the allowable range, the process parameters of the stamping equipment will be adjusted in time. Appearance quality inspection continues to pay attention to whether there are new defects. For example, mold wear during the stamping process may cause scratches on the surface of the stamping parts. By timely detection and treatment, defects can be prevented from expanding. At the same time, for some parts with performance requirements, such as brackets that carry large loads, performance tests such as hardness and tensile strength are carried out to ensure that product quality is always under control during mass production.
Finished product inspection is a comprehensive quality control link after the stamping parts are processed. All stamping parts must be inspected before entering the warehouse or entering the next process. The inspectors will conduct 100% appearance inspection on the stamping parts, not letting go of any minor defects. For parts such as home appliance shells with high appearance requirements, they will use visual inspection methods under specific lighting conditions to carefully check the surface flatness, color uniformity, etc. In terms of dimensional accuracy inspection, high-precision measuring equipment such as three-coordinate measuring instruments are used to accurately measure the overall dimensions of the product to ensure that the product meets the design requirements. In addition, functional tests will be conducted to simulate the actual use scenarios of stamping parts in home appliances, and test their assembly performance, connection strength and other functional indicators. Only stamping parts that pass the finished product inspection can enter the next process to ensure that the quality of the delivered products is qualified.
Nondestructive testing is an important means of detection for hidden defects. Some stamping parts may have defects such as pores, inclusions, cracks, etc. that cannot be observed by the naked eye. These defects will seriously affect the performance and service life of stamping parts. Nondestructive testing technology can detect internal defects without destroying stamping parts. Common nondestructive testing methods include ultrasonic testing, which uses the propagation characteristics of ultrasonic waves in different media. When encountering defects, ultrasonic waves will reflect and refract. By receiving and analyzing the reflected wave signal, the location, size and nature of internal defects can be determined; there is also X-ray testing, which uses X-rays to penetrate stamping parts. Due to the different absorption of X-rays by materials of different densities, different images are formed on the imaging plate or detector, thereby discovering internal defects. Nondestructive testing can detect potential problems in a timely manner, prevent unqualified products from entering the market, and ensure the quality and safety of home appliances.
Pre-packaging inspection is the last line of defense in the quality inspection process. When the stamping parts are inspected and ready for packaging, the inspectors will check again whether the specifications, models, and quantities of the products are accurate to ensure that the packaged products are consistent with the order requirements. At the same time, check whether the protective measures for stamping parts home appliance parts processing are in place, such as whether there are rust-proof and scratch-proof packaging materials, whether the packaging method is reasonable, and whether the products can be effectively protected during transportation and storage. If it is found that the packaging does not meet the requirements or the products have omissions or misinstallation, timely rectification is carried out to ensure that the products delivered to customers meet the standards in terms of packaging and quantity, and avoid quality problems in subsequent links caused by improper packaging.
Finally, the recording and analysis of quality inspection data is also an indispensable part of the quality inspection process. During the entire inspection process, the inspectors will record various inspection data in detail, including raw material inspection data, first piece inspection data, process inspection data, finished product inspection data, etc. These data are not only proof of product quality, but also an important basis for quality improvement. Through statistical analysis of inspection data and the use of quality management tools such as control charts and histograms, the quality fluctuation pattern in the production process can be discovered and the key factors affecting quality can be found. For example, by analyzing the size detection data, it was found that the product size deviation was large within a certain period of time. Further investigation revealed that it was caused by mold wear, so corresponding measures were taken to make improvements, continuously optimize the stamping parts home appliance parts processing process, and improve product quality.
