Application of the hottest just in time logistics

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The application of just in time logistics in automobile manufacturing industry

with the continuous development of modern logistics industry, people have focused on how to reduce logistics costs. Advanced enterprise management theory and practice are also developing in the direction of refinement. Among them, just in time (JIT) management represented by automobile manufacturing and electronic technology industry has been widely used in modern manufacturing industry. In recent decades, many famous multinational companies in the world have applied JIT management and achieved high economic benefits. For example, Toyota Motor Company in Japan, Ford Motor Company in the United States and IBM company have successfully implemented JIT management. Therefore, experts believe that the successful application of JIT management is one of the symbols of world-class manufacturing enterprises

first, the principle of just in time logistics

JIT (just in time) logistics management was first created in Japan's Toyota Motor Company in the 1950s, and has been widely used in Japan's automotive and electronic industries since 1972. JIT management provides a guarantee for Japanese enterprises to produce high-quality and low-cost products. Just in time logistics is produced with just in time production in manufacturing industry. With the development of just in time production and! Popularization, just in time logistics has been rapidly developed and widely used

jit logistics is the expression of lean thinking and the collection of a group of activities. Its purpose is to maintain continuous and high-speed mass production while maintaining a minimum inventory of raw materials, products and finished products. The parts arrive at the next process on time from the previous process, and are processed and transferred quickly by the next process. "Just in time" is based on the logic that any process produces necessary products only when needed

theoretically, when a product generates an order, the market pulls a product from the terminal of the production system -- in this case, from the final assembly line. First, the assembly line workers pull the downstream stations one by one from the upstream stations of the logistics, and repeat this process until the supplier's raw materials are put into the process

II. The purpose and prerequisite of implementing JIT in automobile manufacturing industry

the purpose of implementing JIT is to eliminate waste, optimize procedures, and realize efficient and low-cost operation. Let's first understand Toyota's definition of waste: "anything except the minimum amount of equipment, raw materials, parts and workers (working hours) that are indispensable for production." In the automobile manufacturing industry, JIT management is very suitable for the situation that there are many forms of parts. The implementation of JIT logistics management can achieve: reduce the large number of repetitive and disordered work that workers must complete every day; Increase the effective use area of the on-site working environment; Reduce inventory; Shorten the reaction time, etc. In order to realize just in time logistics, JIT management requires high-level quality, good supplier relationship and accurate prediction of final product demand at all stages of the whole production process

Third, the application of just in time pull logistics management mode

in some developed countries, many enterprises have seen the benefits of JIT. A study of 200 enterprises in Europe shows that the improvement of JIT management on enterprise capacity includes the average reduction of inventory by 50% and the shortening of product production cycle by 50% - 70%; Shorten the supply time by 50%; Increase production efficiency by 20% - 50%; The investment payback period of JIT is also less than 9 months

China's automotive industry has fully implemented just in time pull logistics management, gradually formed a logistics process control centered on market demand and guided by the requirements of the main engine assembly line, and gradually established a set of logistics management system suitable for its own development, which has enough flexibility to meet the requirements of enterprise production and adapt to the changing market environment. JIT management means to produce necessary products when necessary, and not over produce, because the enterprise has no mechanical property experiments of materials, such as tension, contraction, zigzag, shear, change, impact, fatigue, creep, durability, relaxation, wear, hardness and so on. It is necessary to invest raw materials, energy and time. The ideal batch size under JIT is 1. JIT thinking is in sharp contrast to the practice of relying on additional inventory to prevent work mistakes. When all the waiting quantity becomes zero, the inventory investment is minimized, the lead time is greatly shortened, the enterprise responds quickly to demand changes, and the quality problems will be exposed quickly. Compared with the traditional production material management, the implementation of JIT logistics improves the enterprise management, saves a lot of costs for enterprises, and produces huge economic and social benefits

there are roughly three forms of just in time logistics management in China's automobile manufacturing industry, namely, plan management, Kanban management and synchronous management

1. Plan management

plan management is to organize production and supply according to the production plan. It is actually a purchasing method calculated based on planned consumption. The principle to be followed is: predict on the basis of the demand on day m, and calculate the stress of many factors affecting the accuracy of displacement test on day m+n, and roll in turn. It is actually close to the traditional planned supply mode, and is also included in the scope of just in time logistics management because of its short prediction and planning cycle. The plan management mode is applicable to auto parts with small changes in the demand of parts varieties and continuous consumption. However, the deficiency of plan management is that when the production plan is adjusted, it cannot make a quick response, which is easy to cause excessive product inventory

2. See board management

see board management is the perfect combination of electronic technology and modern logistics, and it is also a demand driven management mode. It uses bar code technology and network technology to manage production logistics. It is a new management model with fast response and accurate information. Although its stress corrosion cracking resistance meets the requirements. The main carrier of information is the Kanban, which records the part number, purchasing time, part name, storage location of parts, number of parts, model of station apparatus used, etc., as the certificate of purchase, delivery, transportation, production and acceptance of each process. Under the Kanban management mode, each supply of materials is a reasonable supplement to the actual consumption, which fully reflects the principle of just in time logistics

3. Synchronous management

synchronous management is an advanced way of JIT management, which is suitable for assembly parts with high unit value and various forms of change. The supplier is required to share the same software platform with the OEM, prepare single parts in a clear way, download and analyze the vehicle data through the sampling point, and supply according to the accurate requirements of parts on the assembly station of the assembly workshop. Information sharing is a prerequisite for synchronous management. Synchronous management requires synchronous supply according to the operation of the production line to meet the process needs and reduce inventory costs and the occupation of production area. On the assembly line, when the body passes through a certain process, it immediately sends the required assembly to the downstream process

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