Second, the target system is the lowest waste (zero waste). JIT requires to eliminate all kinds of unreasonable reasons, and every working procedure in the processing process requires to reach the best level.
The lowest inventory (zero inventory). JIT believes that inventory is the proof of unreasonable design of production system, uncoordinated production process and poor production operation.
The shortest preparation time (zero preparation time). The length of preparation time is related to batch selection. If the preparation time tends to zero and the preparation cost tends to zero, it is possible to adopt a very small batch.
The production lead time is the shortest. The system combines short production lead time with small batch, and has strong adaptability and flexibility.
Reduce the handling of parts, low processing capacity. Parts feeding and processing are non-value-added operations. If the transportation quantity and processing time of parts and components can be reduced, the assembly time can be saved and the possible problems in assembly can be reduced.
Low machine damage.
Small batch.
Third, JIT support means
1, timely and appropriate production.
The methods of timely and appropriate production are as follows:
(1) production synchronization
Production is synchronous, that is, there is no warehouse between processes. After the last process is finished, the semi-finished products are immediately transferred to the next process, and the assembly line and mechanical processing are almost parallel. In casting, forging, stamping and other processes that must be mass-produced, the production batch should be reduced as much as possible by shortening the changing time as much as possible. The synchronization of production is realized by post-processing collection.
(2) production equalization
Balanced production is a prerequisite for timely and appropriate production. The so-called production equalization means that when the assembly line receives parts in the previous process, it should use all kinds of parts in a balanced way to produce all kinds of products. Therefore, it must be fully considered when making the production plan, and then reflected in the product production sequence plan.
2. Flexible distribution of workers
According to the change of production capacity, flexibly increase or decrease the number of workers in each production line, and try to complete more production with less manpower.
3, quality assurance methods
Under JIT production mode, the consistency of improving quality and reducing cost is realized by running quality management through every working procedure, and the specific method is automation. Automation refers to two mechanisms integrated into the production organization:
First, the equipment or production line can automatically detect defective products.
Second, when the equipment operators in the production line find that there are problems with the products or equipment, they have the right to stop production by themselves.
Extended data
The concept of just-in-time operation has a long history, and Ford Motor Company started this operation in the 1920s. The innovation climax of just-in-time homework began in the 1970s. Toyota in Japan and Xerox in Europe were among the first companies to implement just-in-time operation, among which Toyota in Japan has a long-standing reputation in this respect.
Just-in-time operation mode usually has many names, such as zero inventory, lean production, Toyota system mode, continuous flow production machinery and so on.
JIT production mode was introduced into China from Japan in the late 1970s, and Changchun No.1 Automobile Factory began to apply Kanban system to control production site operations. By 1982, the number of parts picked up by the first automobile factory through kanban has reached 43% of the total number of parts produced by it.
In the early 1980s, China Enterprise Management Association organized the popularization of modern management science. As one of the modern management sciences, Kanban management was popularized nationwide and adopted by many enterprises.
In recent years, in China's automobile industry; The application of JIT in electronic industry, manufacturing industry and other enterprises that implement assembly line production has achieved remarkable results. For example, the first automobile factory, the second automobile factory, Shanghai Volkswagen Co., Ltd. and other enterprises creatively applied JIT in combination with the factory situation, and gained rich experience and created good economic benefits.
Source: Baidu Encyclopedia-Instant System