Element identification and analysis to find out which factors affect process quality and how.
The factors that affect the quality of stamping process usually include six aspects, namely, people's technical quality and ideological quality. The performance of stamping equipment, die structure and manufacturing accuracy, maintenance and maintenance status, etc. Selection of raw materials, stamping process, operating procedures, measuring equipment, test means, test methods and quality standards, etc.
The following will analyze their influence on the quality of stamping process respectively.
People mainly include physical strength, skills, emotions and subjective initiative. People play a decisive role in all factors and are the most active process variables. Among human factors, physical strength and skills are usually emphasized because they are directly related to process variables. What is easily overlooked is subjective initiative and emotional factors, which seems to have nothing to do with process quality. In fact, they play a vital role in the long-term stability and improvement of process quality, and can be said to be the most essential things in human factors. Machines mainly include stamping equipment used in stamping process, such as press crank press, hydraulic press, oil press, CNC punch press, etc. , performance, mold structure and manufacturing accuracy, maintenance and maintenance status, etc. The press is guided by the guide rail, and mechanical wear will reduce the guiding accuracy and affect the quality of stamping parts. Die is a tool to ensure the shape and size accuracy of stamping parts, and its design and manufacturing level is closely related to the quality of stamping parts. In the process of making dies, the quality of stamping parts will also fluctuate. For an enterprise, the influence of "machine" on process quality is relatively stable under the condition of normal equipment maintenance. The raw material used in blanking process is a process variable which is difficult to control and has a great influence on the process quality. The effective method is to strengthen the inspection of incoming materials and carry out pretreatment before stamping, such as leveling and grinding off burrs. Process documents, standards, regulations, etc. Used to guide the production of operators. Therefore, in addition to ensuring the integrity, correctness and unity of relevant documents, it is also necessary to ensure the use of operators.
Effective version, to prevent the overdue use of "temporary technology" and other documents. Operators should be educated frequently to strengthen their understanding of the process. Quantity includes measuring equipment, testing means, testing methods, quality standards, etc. Used to check whether the product quality meets the design requirements of the product. If the measuring equipment itself does not meet the quality requirements and the adopted quality standards are outdated, how to ensure the quality of the products?
Environment is the environment, involving temperature, humidity, noise and cleanliness. The cleanliness of the environment and the fixed management of raw materials, finished products, semi-finished products and tools are the signs of civilized production, and the confusion of management can easily lead to major quality accidents such as mixing. In the production process of stamping parts, no matter how good the performance of the press is, how reasonable the structure of the die is, how high the manufacturing accuracy is, and how good the operator's technology is, the quality characteristic value of stamping parts is always different.
This difference reflects the fluctuation of stamping parts quality. According to different reasons, fluctuations can be divided into normal fluctuations and abnormal fluctuations. Normal fluctuation is determined by the internal conditions of these six factors. Such as trace impurities in raw materials or subtle differences in performance, subtle changes in process parameters, inherent accuracy of presses and molds, normal wear and slight vibration, etc. These small changes are random and inevitable, which have little influence on the quality fluctuation of stamping parts, are difficult to eliminate, and are not worth eliminating economically. Abnormal fluctuations are caused by out-of-control management or work errors, such as unqualified raw materials, serious damage to press performance, mold failure, violation of operating procedures and other factors, which are not allowed in quality control.