A processing quality control method for cylinder head parts

Abstract

The invention discloses a machining quality control method for cylinder cover components, which comprises the steps of 1) establishing a quality characteristic based error propagation network model of a cylinder cover, wherein the step is implemented in a mode that a machining process of the cylinder cover is extracted, quality characteristics corresponding to machining characteristics of each procedure are abstracted into network nodes, network connecting sides are determined according to a benchmark and evolution relation among the procedures, the network connecting sides are weighted based on mutual information, a quality characteristic based error propagation network model of the cylinder cover is established, and a key characteristic, which imposes the greatest impact on the machining quality of the cylinder cover, is determined by adopting complex network analysis; and 2) carrying out Bayesian-VSSI control diagram based key characteristic quality monitoring, wherein the step is implemented in a mode that a sampling strategy is determined, economic design is carried out on a control limit by adopting a genetic algorithm, and the machining process of the key characteristic is monitored accordingly. According to the invention, the key characteristic which imposes the greatest impact on the machining quality is determined, and the cylinder cover machining process is monitored in a targeted mode, thereby avoiding low efficiency and high cost of comprehensive monitoring; and the control diagram, which is more economic and more sensitive to small deviation, is selected, and the cost is reduced.

Description

Technical field: [0001] The invention belongs to the technical field of advanced manufacturing and automation, and in particular relates to a processing quality control method for cylinder head parts. Background technique: [0002] The shipbuilding industry is a strategic industry related to national economic development and national defense security, and is the epitome of modern large-scale industry. After decades of development, my country's shipbuilding industry has achieved remarkable results. At present, my country's shipbuilding industry is in a critical period of transformation from large to strong. As the "heart" of ships, marine diesel engines are facing new requirements of "high power, low emissions, low fuel consumption, high reliability, and intelligence". At the same time, international organizations such as the International Maritime Organization (IMO) have issued a series of new norms and standards for international shipbuilding. Shipowners have higher and hi...

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Problems solved by technology

[0003] However, the characteristics of cylinder head parts make the traditional quality control process more difficult:

[0004] (1) The structure of the cylinder head parts is complex, the processing features are numerous, the process route is long, and the cumulative error transfer effect between processes is obvious. It is difficult to implement the final processing quality alone, but on the other hand, the inspection efficiency of each step of the production process is low and High cost, not in line with actual production

[0005] (2) The cylinder head parts are processed by a precision horizontal machining center with high equipment precision and small deviations in the processing process, but the sensitivity of ordinary control charts to small deviations is poor

[0006] (3) Traditional control charts only design control limits from a statistical point of view, without considering the impact of the implementation process of control charts on processing costs, resulting in high quality costs and reduced corporate profits

[0007] Due to the existence of the above three problems, traditional quality control methods are difficult to effectively monitor the machining process of cylinder head parts, resulting in inefficient production and increased costs

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