Design And Implementation Of Computer Aided Time Quato Management System

The time quota is required time that manufactures the unit product in the manufacturing enterprise.It is the basis for estimating the labor cost of a product,and is also an important basis for the pricing of new products and the internal cost control of the enterprise.The management of the time quota is an important part of the modern manufacturing enterprise management system.The time quota management level of manufacturing enterprises in our contry is low.Many manufacturing enterprises adopt the empirical estimation method to estimate the time quato,that is,the required man-hours are directly estimated by the personnel based on past practice experience.Although this method is simple and fast,the subjective factors are too much influence.Some enterprises have formulated the time quota standards,and the time quato of each step is determined by means of looking up standard table.This method avoids the subjectivity of personnel,but workload is heavy and error-prone.It is urgent to use information system to calculate and manage.Aiming at the problem of manufacturing time quota management,this paper designs and implements a computer-aided time quota management system,which describes the time quota standard of the enterprise as a formable representation that can be processed by the computer.The quota personnel set the parameters in the standard,then the system automatically look up standard table and calculates the single-step time quota.Then the time quato of a part is accumulated according to the process route,the total time quota of whole product is accumulated according to the BOM(Bill of Material).The main work is as follows:1.The formal description method of time quota standard is proposed,including the grammar of parameter declaration,expression assignment and condition selection.It supports four operations of parameters and looks up standard tables according to parameters,etc.The time quota standard of the enterprise can be flexibly and completely express by this method.2.The parser of the time quota standard is designed based on the interpreter pattern.The core of the parser is the parsing of the expression.After lexical analysis of expressions,a grammar tree is constructed according to the interpreter design pattern.After the parameters are bound,the value of expression is calculated.3.The three-tier architecture is used to design and implement the computer-aided time quota management system.System includes the two user interface forms: Web system and WinForm client.Web system implement the functions of time quota standard maintenance,etc.,using ASP.NET,AJAX and other Web development technology.WinForm client implement the functions that requires a highly interactive such as process route editing.The Web Services protocol is used to implement data interaction between WinForm client and the server.Through the actual use of a manufacturing enterprise,the scientific and efficiency of the enterprise's time quota is improved.The system has strong practicability.