Development of the new fabrication system of dental prostheses using the computer assisted combined machining

利用计算机辅助组合加工开发新型假牙制造系统

• 批准号: 08457535
• 负责人: MIYAZAKI Takashi
• 金额: $ 4.74万
• 依托单位: Showa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08457535/
• 关键词: Titanium; Laser; Welding; NC(数値制御); レーザ; NC; 放電加工; レーザ溶接; +フライス加工; 数値制御; CAD; CAM

In order to reduce labor in the laboratory works and to fabricate prostheses with higher quality we already proposed the numerically controlled combined machining. Welding is a key technology to combine the separated parts fabricated casting, mechanical machining, and electric discharging machining. Therefore, we developed the numerically controlled Nd : YAG laser welder. We remodeled the oscillating battery to control the welding energy using PWM where additional pulse with lower pulse height was applied after the initial pulse to increase welding properties. We shot the single pulse to pure titanium to observe the melting properties. We found internal porosity and rough surface on the specimens since the cooling rate was too fast and molten pond solidified before the wave focused. We also found the room for the available energy to obtain good welding was restricted. On the contrary, we could reduce internal porosity and surface roughness with PWM since the solidification started afte … More r the wave of molten pond focused. In addition, freedom of available energy level increased with PWM and we expected to apply the PWM to numerically controlled welding although we found the higher amount of evaporation and deeper concavity of molten pond. Additionally, we performed the experiments to evaluate the welding shrinkage with PWM.We welded a titanium rod with the diameter of 2 mm on the titanium plate with the thickness of 3 mm and measured the shrinkage at the welding. Shrinkage was 24 mum without PWM and 6 mum with PWM.Metallurgical observation indicated larger contraction stress was produced without PWM since the both bottom and surface of molten pond solidified before the center part of the molten pond. On the contrary, smaller contraction stress and gap but deeper concavity were obtained with PWM since the bottom of the molten pond solidified prior to the surface. These findings indicated energy control with PWM reduced the residual stress at the welding spot and prevented the deformation and the occurrence of welding crack. We successfully applied the numerically controlled welding to fabricate the metal frameworks for bridge on the metal molds. Less

为了减少实验室的工程，我们已经用高质量的draking来结合了分离的零件，机械手机和电动机矿石。 PWM在初始脉冲之后施加了ER脉冲高度，以提高您的单个钱包，以观察熔融性能我们还发现，相反随着PWM的增加，我们期望将PWM苹果在数值控制的焊接中，发现我们发现了较高的蒸发量和更深的熔融池，我们进行了经验，以评估焊接的收缩。在厚度为3毫米的钛板上，在焊接的底部和焊接底部的底部固化，在熔融池的底部固化，在熔融池的底部进行了测量。在表面上进行熔化的能量控制。较少的。

项目成果

Lee Won-Sik, Miyazaki Takashi: Clinical Courses of Dental Laboratory Technology I "Application of laser, electroforming, and electric discharge machining to dental laboratory works". Ishiyaku Publishers, INC, 172-180 (1997)

李元植、宫崎隆：牙科实验室技术临床课程 I“激光、电铸和放电加工在牙科实验室工作中的应用”。

李元植・前原聡・直井繁治・宮崎隆: "パルス改良型Ncl:YAGレーザ溶接機を用いた純チタン溶接における基礎的研究" 歯科材料・器械. 16(S30). 106 (1997)

Yuanshi Lee、Satoshi Maehara、Shigeharu Naoi 和 Takashi Miyazaki：“使用脉冲改进 Ncl:YAG 激光焊接机进行纯钛焊接的基础研究”牙科材料和仪器 16(S30)。

前原 聡 他: "省力化を目的としたNd : YAGレーザ溶接装置の歯科技工への応用に関する研究" 歯科材料・器械. 17 (S31)(印刷中). (1998)

Satoshi Maehara 等人：“以节省劳动力为目的的 Nd:YAG 激光焊接设备在牙科技术中的应用研究”，《牙科材料和仪器》17 (S31)（出版中）。

李 元植 他: "パルス改良型Nd : YAGレーザ溶接機を用いた純チタン溶接における基礎的研究" 歯科材料・器械. 16 (S30). 106- (1997)

Yuan-sik Lee 等人：“使用脉冲改进 Nd:YAG 激光焊接机进行纯钛焊接的基础研究”牙科材料和仪器 16 (S30-1997)。

Maehara Satoshi, Lee Won-Sik, Kishida Toru, Miyazaki Takashi: "Application of NdiYAG laser welder to dental laboratory works for reducing labor" J J DENT Mater. 17(S31).

Maehara Satoshi、Lee Won-Sik、Kishida Toru、Miyazaki Takashi：“NdiYAG 激光焊接机在牙科实验室中的应用可减少劳动力”J J DENT Mater。