water spider, also known as Mizusumashi, Water spider, in a lean factory, connects the supermarket and the edge, and is responsible for the transmission of materials and information. Water spiders, like buses or subways, have a fixed cycle time, cycle route and stop points to ensure that the right products are provided at the right time in the right quantity.
Same as the employees of the production line, Water Spider also has its own standard operation, through standard operation to reduce waste in work. Water spider standard operation mainly includes three aspects: cycle time, work content and work route and stopping point .
Cycle time
The shorter the cycle time of the water spider, the smaller the amount of inventory at the edge of the line, but it is usually 20 minutes, 30 minutes, 60 minutes, mainly from the perspective of facilitating the memory of the water spider, more than 2 hours, it doesn't make much sense. In the calculation, the cycle time of the water spider is related to the workload, the running route, the container capacity, the consumption speed, the line-side inventory, and the compartment capacity, and a balanced choice is required.
After the cycle time of the water spider is determined, its workload can be determined accordingly. According to the actual measurement of the workload, the time required to complete these tasks is measured. The best workload is about 80%.
The water spider runs according to the cycle time. However, due to different container capacity, parts consumption, and production line status, the end time of different cycles of the water spider may be different, sometimes early and sometimes behind, this is a normal phenomenon. When the cycle is completed in advance, there is no need to start the next cycle immediately, just wait for the normal cycle time, because the line edge design will ensure that there will be no shortage of material in the next cycle.
work content
work content is simply that the water spider takes the materials needed for the production line from the supermarket according to a certain route, and distributes them to the point of use on the line.Then return the empty container and information to the supermarket, and then take the material from the supermarket.
There are three points to be mentioned in particular:
First, the materials must be delivered to the point of use and placed within the reach of employees (to be determined during the line edge design), without the need for employees to move. Removal;
The second is to bring bare parts online to reduce production line waste and reduce waste of employees;
The third is to bring back the line-side packaging materials (must be removed on site) and other garbage, unified Place it in the designated area.
In addition, since the main equipment of the water spider is a tooling truck, in order to reduce the waste of searching, each material should be placed in a fixed position of the tooling truck and visualized.
working route and stopping point
working route should be combined with work content and factory layout, and design a running route that is suitable for the water spider train to walk, can complete all the tasks and the shortest distance. At the same time, the stop point on the route is designed to ensure that at the stop point, the water spider can walk the shortest distance when feeding material to the edge of the line.
In the process of operating according to the standard operation, the water spider still needs to continuously improve, reduce the operation time of various places, optimize the running route and stop points, and continue to form new standard operations.
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