Negrican Sandalcı 030070084 1st Week

Small Batch Production ( New / Better )

Small Batch production become a major production mode, in this production mode, the batch of parts is small and the variety is many, it is difficult to satisfy the data capacity requirements of statistical process control, even the control charts were made, however it is easy to get erroneous estimation and send out false alarms because of lacking the sample data which are easy to disturb natural produce.

 Therefore it has great significance of improving product quality based on part family with the similar working procedure by transforming the product quality characteristic parameters from the key working procedure to obey the same distribution, establishing dynamic quality control charts to inspect the manufacturing process real time.

 CURRENT STATUS OF QUALITY CONTROL IN SMALL BATCH MODE

In the mode of Small Batch production, the batch of parts is small and the variety is many, and product design sizes are dissimilar, the grades of precision are different, it is difficult to use the traditional statistical process control to make control charts with the objective of inspecting the manufacturing process.

.

DATA TRANSFORMED METHOD BASED ON PART FAMILY

According to the characteristic of manufacturing techniques of the same part family, it can make use of group

technology to establish the part family in Small Batch Production mode; this can solve the problem of lacking sample data. Controlling quality based on part family needs to solve two problems, first, in the initial stage of processing, data is absent, the conventional quality control method is difficult to apply because of lacking data and easy to get false alarm; second, how to transform data without the total average of manufacturing process to make control charts in time to inspect the state of process without the product process average.

(Cui Jingwei, Xie Liyang. Study on the Theory of Control Charts in Small-Batch Production. Modular Machine Tool Automatic Manufacturing Technique, 2006,(10),pp:1-4)

 Small Batch Production ( Old )

Production rate is defined as the number of the parts produced per unit time, such as per day, per month or per year. The approximate and generally accepted ranges are given at the related tables in books or standarts. Job shops typically produce small quantities per year using various stardard general-purpose machine tools or machinig centers. Small-batch production is the kind of a production which has the quantities typically range from 10 to 100 and the equipment used consists of general-purpose machines and machining centers with various computer controls.
(Kalpakjian S., Schmid S.R., Manufacturing engineering and technology, pg 1149)