This research aims to study the shrinkage of plastic polyethylene Terephthalate used with the make blow mold in 2 stages. The shrinkage of work piece was determined in order to design the mold ; Z axis = 1% XY axis = 2.5% . The testing results were as follow. 1. Horizontal shrinkage(Z axis) was 0.85% which differed from the determined shrinkage(1%) at 0.15% 2. Vertical shrinkage(XY axis) was 1.83% that is 0.67% which differed from the determined shrinkage(2.5%) at 0.67%

This research was on the production of hardmetal from recovery of tungsten carbide tool scraps recycling through ball milling for 40 hours. The metal powder obtained which was of the size between 0.11-0.22 µm was composed of 96.69% of tungsten carbide (WC) 1.68% of tantalum (Ta) 1.21% of titanium (Ti) and 0.42% of niobium (Nb). When mixed with 5-15% cobalt binder metal cold isostatic press (CIP) sintered at 1450 ° C it became hardmetal work piece dimension 12.39 x 13.82 x 5.60 mm with 1410 HV hardness and 14.34 g/cm3 density. The result of S45C steel turning was tools life good. The research concluded that the hardmetal work piece produced by the developed material had suitable basic specification and would lead to the development in working in the future.

This research is designing and construction an apparatus of deflection of fixed end beam under uniformly distribution load. SolidWorks program is used for structure designing and CosmosWorks program is used for strength of structure analysis. Deflection and strain of beam were compared with the result of mathematical model according to function stress principal. Error of mathematical model result does not exceed 10%. Therefore this apparatus can be used as prototype and produced for education purpose.

The research aimed to analyze jewelry in various forms such as necklaces bracelets rings and earrings as well as to apply knowledge to develop jewelry with stamping techniques by using metals silver and synthetic gemstones. The data of the research was obtained from the interview the analysis of jewelry forms for producing an jewelry prototype and the satisfactory evaluation. The results of the research were that the most of modern jewelry had natural shapes. However they had few manmade patterns. The patterns mostly came from the colors of the gemstones. Silver was used as a material of the whole jewelry ring. As work creativity it was found that most modern jewelry production was based on wax mold prototype molding rubber mold press wax injection molding finishing plating and stone decoration. The result of the research brought to the design for developing better jewelry forms. The process of the design consisted of studying design theories and creating various jewelry forms. As the evaluation by the experts the design with natural shapes obtained the highest rate of evaluation (the second form). The second highest one was the seventh form which was the contemporary jewelry with beautiful gemstones. This one was suitable for jewelry prototype production with stamping techniques by using paper clay ceramic for satisfactory evaluation the consumers were satisfied with the jewelry made of paper clay ceramic with the rates of much and the most. This was consistent with the research hypothesis i.e. to obtain modern forms of jewelry made of paper clay ceramic which were used as a guideline for creating and developing modern jewelry forms according to the customer’s needs and for developing materials for innovation which could reduce production cost and time of the manufacturers.

The objectives of this research were to select the most appropriate forecasting model for uncertain demand of hot-rolled steel and to find the purchase amount and the reorder point of some raw materials in order to minimize the total cost of production in an iron and steel production planning. The three forecasting models which were exponential model ARIMS model and the proposed Bayesian model were studied. An iron and steel factory in Samutprakarn province was a prototype for this study. Because of their uncertain high demand the Steel H-Beam Steel plate steel round bar and black steel round bar with various sizes were selected and their parameters including demand rate inventory cost back order cost and setup cost were collected. The study found that the proposed Bayesian forecasting model is the most appropriate. The predicted demand and all parameter values were used to find the purchase amounts and the reorder points of the raw materials under the (rQ) policy of the stochastic inventory model.