งานวิจัยนี้เป็นการศึกษาปัญหาในงานหล่อและพัฒนาแนวทางแก้ไขปัญหาในงานหล่อ เครื่องประดับสมัยใหม่ ที่มีการสร้างต้นแบบตัวเรือนเครื่องประดับจากกระบวนการผลิตด้วยเทคโนโลยีการ ขึ้นรูปด้วยเครื่องสร้างต้นแบบอย่างรวดเร็ว (Rapid Prototype Machine) ด้วยวัสดุแว็กซ์ wic100a โดย ทาการศึกษาอุณหภูมิการอบเบ้าปูน เพื่อกาจัดแว็กซ์ออกจากเบ้าปูนให้สมบูรณ์ แล้วทดลองนาไปหล่อเป็น ตัวเรือนโลหะ ผลจากการศึกษาการอบเบ้าปูนที่ใช้ต้นแบบตัวเรือนวัสดุ wic100a เมื่อนามาเปรียบเทียบกับ กราฟการอบเบ้าปูนที่มีต้นแบบตัวเรือนเป็นแว็กซ์เขียวทั่วไป จากการศึกษาพบว่าวัสดุแว็กซ์เขียวเมื่อได้รับ ความร้อนจะเริ่มหลอมละลายที่อุณหภูมิ 90 องศาเซลเซียส จนหลอมละลายจากก้อนเป็นของเหลว ทั้งหมดที่อุณหภูมิ 120 องศาเซลเซียส ซึ่งสามารถใช้อุณหภูมิและเวลาที่กาหนดไว้จากมาตรฐานทั่วไป นามาใช้ในการอบเบ้าปูนเพื่อกาจัดแว็กซ์ได้ โดยใช้อุณหภูมิสูงสุดเพื่อเผาไล่เศษขี้เถ้าแว็กซ์ที่ 750 องศา เซลเซียส แต่แว็กซ์ wic100a ไม่หลอมละลายในช่วงอุณหภูมิต่าว่า 270 องศาเซลเซียส แต่จะเกิดการเผา ไหม้แทนโดยใช้อุณหภูมิเผาให้ตั่งแต่ 270-450 องศาเซลเซียส ในสภาวะปกติ 350-500 องศาเซลเซียสใน เมื่ออยู่ในเบ้าปูน และต้องใช้อุณหภูมิในการเผาไล่ขี้เถ้าแว็กซ์ถึง 850 องศาเซลเซียส เพื่อเผาไล่เศษขี้เถ้า แว็กซ์ จึงจะสามารถทาให้โพรงแบบสะอาด เมื่อนาเบ้าปูนไปหล่อด้วยโลหะเงินสเตอร์ลิง 925 แล้วได้ ชิ้นงานที่มีความสมบูรณ์ดี

This paper describes an aluminum casting jewelry manufacturing because of the current manufacturing costs are higher. Material or metal that is commonly used to cast jewelry is silver which aluminum Alternatives to metal. Melting is There is a close color and surface finish can be beautiful. But aluminum is a material that is cheap has studied and tested. Replacement aluminum casting body jewelry. The temperature in the baking mold before casting to test all five temperatures are 550 500 450 400 350 degrees Celsius then casting body jewelry in the next stage of the research process casting jewelry with the. aluminum to Experimental temperatures used in baking mold casting plaster for the mold temperature of 400 is appropriate. Best of casting jewelry with aluminum. The results showed that there is minimal waste and a 102 pieces of 48 pieces and has a smooth surface. A similar performance to the other materials available. Similar properties

Thailand’s gem and jewelry industry is widely considered one of the greatest potential markets in the world. One of the important processes is producing the body jewellery or casting. The lost-wax castingtechnique is a popular technique used widely. However it can also be a source of many defects such as porosity tarnishing incomplete form filling and water stain. There is not finding causes of problems affecting the cost of production labor energy and time increased. This research aims to study the production problems and deficiencies of work piece in the actual work from10 casting industriesto identifying and preventing all these problems. This study will be helpful to entrepreneurs gems and jewelry industry to use as guidelines to prevent defects reduce waste reduce production costs and improve the casting process for the piece even more quality. The study found that most of the production process is the main the machinery / equipment and material problems the problem of secondary respectively by this process the main problem is the casting and foundry molds the injection and the candles prototype and mold making rubber the order is a minor respectively work piece for defects in castings are very common a flaw was found in the specimens I have a 6 specimen defects found in wax and defects found in rubber molds and prototypes the defect occurs in each style be caused by a wide variety of cases. Problems encountered in this study the most hole of the shrinkage problem problem of casting porosity the hole of the bubble the cracking problem the cast is not full the problem is the ceiling.

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.

Thailand is a well known country where jewelry is produced to export. The process of jewelry production needs many special skills and efficient machines. Moreover the preparation of plaster is also important in producing jewelry. This requires various stages and takes more time to do. However these problems can be eliminated by knowledge in engineering. Therefore this study aimed to develop the vacuum mixer for mixing Investment for jewelry production. The vacuum mixer consists of 12 Hp 220 volts ac electric motor with the gear which has 1:40 dimension. The whole body of the vacuum mixer is made of stainless steel. The pot for mixing the Investment is 21 em. wide and 31.5 em. high. The tub at the base for placing the pot is 29 em. wide and 21 em. high. This base is equipped with a 20 m3 per hour vacuum ventilator and a vibrating motor. This vacuum mixer is operated by the electric motor which transmits power into gear. Then the gears drive the belt to make the blade stiring the Investment and water in the pot until they are well mixed together. Then the mixture is forced to the tub at the base by the valve while the air is sucked up and the mixture of the Investment is cured until all bubbles are disappeared from the mixture. After experimenting the result revealed that the use of the vacuum mixer can reduce the steps in preparing the plaster from 8 steps to 4 steps. It can also save 52% of time allotted.