• Title/Summary/Keyword: Wax pattern

Search Result 77, Processing Time 0.027 seconds

Study on the Rapid Manufacturing for Investment Casting (쾌속조형기를 이용한 정밀주조물의 쾌속제작에 관한 연구)

  • 주영철;김태완
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.3 no.2
    • /
    • pp.136-140
    • /
    • 2002
  • The investment casting process is used frequently to manufacture precise and complex shape metal parts. The previous wax pattern manufacturing process takes long time and high costs because the process is performed by hands. In order to improve the wax manufacturing process, a new process is developed to manufacture the wax pattern by using a rapid prototyping system. A CastForm pattern is made by a Selective laser Sintering type RP with CastForm powder. The CastForm pattern is dipped in the melted wax liquid, and the melted wax penetrates into the pores of the CastForm pattern. Wax pattern is obtained after cooling the CastForm pattern slowly. A stainless steel part has been manufactured by the suggested process. By obtaining the suggested process the manufacturing time and costs are reduced largely and the accuracy is improved.

  • PDF

A Study on the Castability Depending On Angle and Direction of Sprue and Wax Pattern (Sprue와 Wax Pattern의 각도 및 방향에 따른 주조성 연구)

  • Koh, Myoung-Won;Choi, Un-Jea;Chung, Hee-Sun
    • Journal of Technologic Dentistry
    • /
    • v.26 no.1
    • /
    • pp.105-114
    • /
    • 2004
  • This study obtained the following consequences, as a result of the comparative analysis for the castability depending on an angle of the sprue and wax pattern in case of manufacturing dental prostheses, for the castability depending on direction, and for the castablility of sprue, which attached the reserve to each different 3.5mm roll wax(sprue wax) and to 2.5mm sprue wax. 1. As a result of the comparative analysis for the castability depending on an angle of the sprue and wax pattern, the best castability was shown when the angle of the sprue and wax pattern is 180$^{\circ}\Delta$(straight line), and the lowest castability was shown in 45$^{\circ}\Delta$, which was curved most, and there was no statistical significance. 2. As a result of the comparative analysis for the castability of an angle depending on direction, the best castability was shown in the farthest side from the direction of centrifugal casting, and the lowest castability was shown in the same side as the direction of centrifugal casting, and there was no statistical significance. 3. Given comparing the castability depending on the pattern of sprue, the better castability was shown in 135$^{\circ}\Delta$ and 180$^{\circ}\Delta$ when using 3.5mm roll wax(sprue wax), compared to attaching the reserve to 2.5mm sprue wax.

  • PDF

The examination of the pores of casting bodies depending on the position of wax pattern in the ring for precious alloys (Ring 내 납형의 위치에 따른 귀금속합금 주조체의 수축공 관찰)

  • Park, Min-Ju;Noh, Hak;Ko, Dae-Jin;Jung, Jong-Hyun
    • Journal of Technologic Dentistry
    • /
    • v.30 no.1
    • /
    • pp.9-15
    • /
    • 2008
  • An investigation was carried out to examine the pores of casting bodies depending on the position of wax pattern in the ring for precious alloy by optical micrographs. From the result of optical micrographs, many pores were found in the Group C that wax pattern is placed in the center of the ring. However, any pores were scarcely found in the Group A, B, D and E that wax patterns are placed out of the center of thermal zone. In comparison with the pores of casting bodies of Group C, many pores were found at the cusp area rather than at the proximal surface. From these examination, it was concluded that wax pattern should be placed out of the center of thermal zone to prevent casting boies from occurring pores.

  • PDF

The Technology Development of Investment Casting Using 3D Printer Pattern (3D Printer Pattern을 이용한 정밀 주조 기술 개발)

  • Kwon, Min-Hyung;Kim, Ho-Chan;Lee, Seok;Lee, Seok-Hee
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2002.10a
    • /
    • pp.566-569
    • /
    • 2002
  • Rapid Prototyping is a prototyping technology that produces complicated parts directly form three dimensional CAD data with high efficiency, and has been extensively applied to various manufacturing processes. The aim of this research is to apply a 3D printer part as wax pattern in the investment casting process. The difference between conventional pattern wax and 3D printer wax is compared by experiments. The direct casting method is developed for ceramic-shell investment casting.

  • PDF

Comparison of internal adaptation of removable partial denture metal frameworks made by lost wax technique and printing technique of pattern using CAD (Lost wax technique과 CAD를 이용한 pattern의 프린팅 방식으로 제작된 가철성 국소의치 금속구조물의 적합도 비교)

  • Choi, Wonjun;Woo, Yi-Hyung;Kim, Hyeong-Seob;Paek, Janghyun
    • The Journal of Korean Academy of Prosthodontics
    • /
    • v.56 no.1
    • /
    • pp.17-24
    • /
    • 2018
  • Lost wax technique of casting wax patterns has been used principally to make metal frameworks of removable partial dentures. Since the development of digital technology and CAD, metal frameworks can be built through digital surveying and framework designing. Many cases proved that resin patterns made by CAD printing method were well adapted to internal oral structure and final metal frameworks also showed good internal adaptation as well. The metal frameworks of a removable partial denture were made by both lost wax technique and CAD technique and were applied to a patient with severe alveolar bone loss. Using CAD data and fit checker, internal adaptation of both metal frameworks were evaluated by comparing the gap between surveyed crown and its structure. This study is to prove that metal frameworks by both techniques showed adaptation that can be applied in clinical field.

A study on the design wax up technique for mandibular molar occlusion surface (하악구치 교합면의 design 조각법에 관한 연구)

  • Moon, Hee-Kyung
    • Journal of Technologic Dentistry
    • /
    • v.24 no.1
    • /
    • pp.107-126
    • /
    • 2002
  • The first function of occlusion is mastication. Therefore the functional restoration of occlusal surface is very important. The restoration of occlusal surface is three method as wax bite technique, F.G.P. technique, cone technique. Many dental technician is using compound method. I am using compound method of wax bite technique and cone technique. I have knew common point on each teeth during I have waxing up wax pattern. So I studied on the design waxup technique for mandible molar occlusion. The results of the study were as follows; 1. The dam wax up method can restore axial contour of teeth very easy and make short working time of wax pattern. 2. The height of dam must be same with cusp of adjacent teeth. 3. Automatically the contour of tooth is appeared if the contour of dam is relationship with cuspid line of adjacent teeth. 4. The height of contour of buccal, lingual surface is formed natural curve to add fluid wax by gravitation. 5. The development groove of mandible first premolar is appeared V form. 6. The development groove of mandible second premolar is appeared Y form. 7, The development groove of mandible first molar is appeared M form. 8. The development groove of mandible second molar is W form. 9. The embrasure is formed to carve around contact point area as round convex. It affects to axial form of tooth. 10. The buccal, lingual groove of molar is formed parallel with direction of teeth arrangement.

  • PDF

Die Making and Product Prototype Fabrication in Investment Casting by SLA Rapid Prototyping Technique (급속조형기술을 이용한 쾌속정밀주조 금형 및 시제품 제작)

  • Park, Moon-Sun;Kim, Dae-Hwan;Kwak, Jeong-Gi;Hwang, Sang-Moon;Kang, Beom-Soo
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.16 no.11
    • /
    • pp.74-80
    • /
    • 1999
  • In this study, a stereolithography apparatus (SLA) prototype is used as a master model to be transformed into the silicone pattern by vacuum tool forming. The tool for the first prototype is fabricated by using this silicone pattern. Following this procedure, a temporary tool with metal powder and epoxy for wax injection is prepared for the die set of quick change type which consists of upper and lower base die나 and an insert die. The die set of quick change type appears to be very effective in casting operation by changing tools rapidly. The original wax pattern is formed through the die set, and is made of lost-was. Finally the lost-wax pattern is applied to investment casting. The final casting product is checked regarding its dimensional accuracy.

  • PDF

A study on Thermal expansion of Inlay waxes (Inlay wax의 열팽창에 관한 연구)

  • Nam, Sang-Yong;Kwak, Dong-Ju;Cha, Sung-Soo
    • Journal of Technologic Dentistry
    • /
    • v.30 no.2
    • /
    • pp.17-22
    • /
    • 2008
  • The purpose of this study was to observe the thermal expansion of the inlay waxes at temperature. Inlay pattern wax shows not only a high coefficient of expansion but also a tendency to warp or distort when allowed to stand unrestrained. The thermal expansion of inlay waxes was tested according to the treatment conditions for 10 minutes at $40^{\circ}C$ The thermal expansion of inlay waxes at various temperatures was measured with an electro dial gauge. The results were as fellows: 1. It is shown that the rate of thermal expansion of wax A is 0.2%, wax B is 0.29%, wax C is 0.38%, and wax D is 0.22% at $40^{\circ}C$ 2. It is shown that the coefficient of thermal expansion of wax A is $106{\times}10^{-6}/^{\circ}C$, wax B is $152{\times}10^{-6}/^{\circ}C$, wax C is $199{\times}10^{-6}/^{\circ}C$, and wax D is $116{\times}10^{-6}/^{\circ}C$ at $40^{\circ}C$ 3. The thermal expansion of the inlay waxes at $40^{\circ}C$ was shown to increase in the order of wax C, B, D, A.

  • PDF

Variations of Form Accuracy in the Process of Metal Cast Prototyping using Rapid prototype, Vacuum casting and Ceramic Mold (쾌속조형과 진공주형 및 세라믹 몰드를 이용한 금속 주조 시제품 제작 공정에서의 형상정밀도 변화)

  • Kim, Gi-Dae
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.24 no.6
    • /
    • pp.131-137
    • /
    • 2007
  • In metal casting process, it is very difficult to predict the form accuracy of cast part and reduce repeatability error. In this study, the variations of form accuracy were measured in the process of metal cast prototyping, where RP part is manufactured from CAD model in the first, and then, wax part is cast in the vacuum environment using the RP part as master model, and finally metal prototype is cast using ceramic mold and the wax part as pattern. To investigate the variations of form accuracy, the averages and standard deviations of error distribution of the parts measured by 3D scanner were compared. It was observed that the biggest shrinkage is generated during the extraction of wax part in the second step and the biggest deterioration of form accuracy is generated during the metal part casting in the last step.

A Study of Using FDM/ABS Parts as Wax-Pattern Substitutes in the Investment Casting Process (FDM 쾌속 조형기를 통해 만들어진 ABS 파트를 이용한 직접 정밀 주조에 대한 연구)

  • Choi, Doo-Sun;Shin, Bo-Sung;Kim, Joo-Han
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.16 no.10
    • /
    • pp.59-67
    • /
    • 1999
  • The lead time for new products is very limited in the current manufacturing processes, therefore the Rapid Prototyping process has been introduced and generally used in the industry. Fused Deposition Manufacturing (FDM) is one of the most common methods in this field. In the FDM process, the patterns are made of Wax of ABS and ABS shows better quality of the patterns. To date, the FDM/ABS patterns are used in investment casting for making silicon moulds to produce was patterns because it is very difficult to dewax FDM/ABS directly. The aim of this paper was to propose a feasibility of using FDM/ABS parts as wax-pattern substitutes in the investment casting process. The effects of casting conditions, such as pre-heat temperature and casting temperature, are provided. Comparisons with the conventional investment casting processes using the wax-patterns under the same prototype are made. Lead-time and saving cost are discussed in using FDM/ABS parts as was-pattern substitutes compared with the products from other rapid prototype systems.

  • PDF