在第四章备件分类存在的问题中已经指出，D公司备件分类主要是由工程技术人

It has been pointed out in Chapter 4 Existing Problems of Spare Parts Classification that the classification of spare parts of D Company is mainly judged by engineering and technical personnel based on actual work experience and revised once a year. This method of lacking specific standards and judging based on the experience of engineering and technical personnel is very subjective. Engineers and technicians often start from the perspective of facilitating their own work and identify more spare parts as key spare parts, so as to set a higher safety inventory, reserve more spare parts, and facilitate subsequent purchase management. This approach is inevitable Will result in inventory funds higher than actual demand and difficult to reduce. Therefore, to reduce the amount of inventory, the first step is to identify the part of the safety stock that is higher than the actual demand through an effective way. To identify the rationality of safety stocks, the first step is to classify spare parts, identify key spare parts and non-critical spare parts, and then set up safety stock based on the key attributes of spare parts. Due to the complexity and diversity of company D’s spare parts, if the classification standard is too simple and single, the classification of spare parts will be inaccurate, and it will be easy to generalize. If we analyze specific spare parts in detail, the classification of spare parts will be too complicated and difficult to expand. Under normal circumstances, the cost of out-of-stock, frequency of use, difficulty in purchasing, and detection of failure of the spare parts are several important features that need to be considered whether the spare parts are critical or not. The following refers to the FMEA theory (potential failure mode and impact analysis) in the TS16949 quality management system, and discusses the ABC classification of spare parts with out-of-stock cost, frequency of use, detection, and availability as the criteria for classification of spare parts.

In chapter IV, the problems of spare parts classification has been pointed out that Company D spare parts classification is mainly determined by engineering and technical personnel based on practical work experience, revised once a year. This lack of specific standards, according to the experience of engineering and technical personnel to judge the method, there is a great deal of subjectivity. Engineering and technical personnel will often from the point of view of facilitating their own work, more spare parts will be identified as key spare parts, so as to set up higher safety inventory, reserve more spare parts, facilitate the follow-up requisition management, this practice, will inevitably lead to higher inventory funds than actual demand and difficult to reduce. Therefore, to reduce the amount of inventory, the first step is to identify this part of the safety inventory above the actual demand through effective means. To identify the rationality of safety inventory, first of all, it is necessary to classify spare parts, identify key spare parts and non-critical spare parts, and combine the key properties of spare parts for safety inventory setting. Due to the complex diversity of spare parts in Company D, if the classification criteria are too simple and single, the classification of spare parts will be inaccurate and easy to be generalized. If the specific analysis of specific spare parts, but also make the classification of spare parts too complex to expand. In general, out-of-stock costs, frequency of use, difficulty in purchasing, detection of faults in spare parts themselves are several important features to consider whether spare parts are critical or not. The following is based on the FMEA theory (potential failure mode and impact analysis) in the quality management system of TS16949, and the ABC classification of spare parts is discussed with out-of-stock cost, frequency of use, detection and readiness as the criteria for spare parts classification.

It has been pointed out in the fourth chapter that the spare parts classification of D company is mainly judged by the engineering and technical personnel according to the actual work experience and revised once a year. This method is lack of specific standards, and it is subjective to judge according to the experience of engineering and technical personnel. Engineering and technical personnel often identify more spare parts as key spare parts from the perspective of facilitating their own work, so as to set up higher safety inventory, reserve more spare parts, and facilitate subsequent requisition management. This practice will inevitably lead to inventory funds higher than actual demand and difficult to reduce. Therefore, in order to reduce the amount of inventory, the first thing is to identify the safety stock which is higher than the actual demand through effective ways. In order to identify the rationality of safety stock, the first step is to classify the spare parts, identify the key spare parts and non key spare parts, and then set the safety inventory according to the key attributes of spare parts. Due to the complexity and diversity of spare parts of D company, if the classification standard is too simple and single, the classification of spare parts will be inaccurate and easy to generalize. If the specific analysis of specific spare parts, it will make the classification of spare parts too complex and difficult to carry out. In general, shortage cost, frequency of use, difficulty of purchasing and fault detection degree of spare parts are several important characteristics that need to be considered whether the spare parts are critical or not. Based on the FMEA theory of TS16949 quality management system (potential failure mode and impact analysis), the ABC classification of spare parts is discussed based on the shortage cost, frequency, detection degree and availability