一种库存管理和生产策略,只在生产过程或客户需要时才生产或交付材料、部件和产品,从而最大限度地降低库存成本和浪费。
- 方法: 工程, 产品设计, 项目管理
准时制(JIT)

准时制(JIT)
- 持续改进, 准时制(JIT), 看板, 精益制造, 精益生产, 生产效率, 质量管理, 供应链, 减少废物
目标
如何使用
- 依赖于信号(例如、 看板 卡)来触发生产或物料移动。旨在建立一个 "拉动 "系统,由下游活动向上游活动发出需求信号。需要高度可靠的供应商、稳定的需求和高质量的流程。
优点
- 降低库存成本(存储、报废、资本占用);最大限度地减少与生产过剩和缺陷有关的浪费;改善现金流;提高生产效率和灵活性(如果实施得当)。
缺点
- 极易受到供应链或生产中断的影响(如供应商延误、设备故障);需要非常稳定和可预测的需求;容错空间小,缺陷可能导致整条生产线停产;可能将库存负担转嫁给供应商。
类别
- 经济学, 精益西格玛, 制造业, 质量
最适合:
- 通过只在需要时才生产和交付货物,最大限度地减少生产系统中的库存和浪费。
Just-In-Time (JIT) methodology has found its way into a variety of industries such as automotive manufacturing, electronics, and consumer goods, where it contributes significantly to operational efficiency. In automotive production, JIT allows manufacturers like 丰田 to manage their supply chains proactively, ensuring that parts arrive on the assembly line just as they are needed, which reduces downtime and inventory holding costs. In electronics, companies like Dell utilize JIT principles to customize computer builds according to customer specifications while minimizing surplus components. This methodology proves particularly effective during the design and development phase of new products, where teams can rapidly iterate by incorporating feedback and adjusting orders based on real-time demand signals. For JIT to function successfully, it necessitates collaboration across various functions, including procurement, production, and logistics, often engaging suppliers closely in the process. Participants in the JIT approach must be trained in effective inventory management practices, emphasizing the importance of quality assurance to prevent defects that can disrupt flow. Furthermore, it requires a stable production environment that can adapt to changes in demand, necessitating reliable forecasting methods and strong communication channels between all stakeholders involved. High-quality processes are paramount, as defects not only impact production but can also lead to increased costs and delays, undermining the efficiency gains JIT aims to achieve. In addition to these applications, the push towards sustainability in manufacturing is complemented by JIT principles, as reduced inventory and waste align with environmental goals, driving companies to innovate while responding to market needs dynamically.
该方法的关键步骤
- Identify critical processes in the production flow that can benefit from JIT principles.
- Establish a pull system with Kanban signals for inventory management.
- Ensure stable demand through forecasting and customer feedback mechanisms.
- Coordinate closely with suppliers to ensure timely delivery of materials based on pull signals.
- Implement standardization of processes and maintenance of high quality to minimize defects.
- Train staff on JIT principles and practices to foster a culture of continuous improvement.
- Regularly review and adjust the system based on performance metrics and feedback.
专业提示
- Implement advanced analytics to enhance demand forecasting, reducing reliance on historical data and improving order timing.
- Invest in robust supplier relationships through collaborative platforms for real-time information sharing, improving responsiveness to changes in demand.
- Continuous process improvement using Lean Six Sigma methodologies to minimize defects and enhance quality, supporting JIT’s reliance on high-quality outputs.
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