共查询到19条相似文献,搜索用时 140 毫秒
1.
聚晶金刚石复合片的电火花线切割机理与形貌 总被引:6,自引:0,他引:6
开展了聚晶金刚石复合片(PDC)的电火花线切割实验,提出了PDC的电火花线切割模型。通过扫描电镜与拉曼光谱仪对切割试件进行显微观察与成分分析,发现聚晶金刚石层表面存在明显石墨化现象,而且聚晶金刚石层与硬质合金层之间的富钴界面层存在严重过量去除现象。按聚晶金刚石层、富钴界面层与硬质合金层三个部分剖析了PDC放电蚀除机理,并对PDC的电火花线切割热损伤进行了分析。研究表明,解决富钴界面层的过量去除问题是提高PDC电火花线切割加工质量的关键。 相似文献
2.
采用电火花线切割方法对聚晶金刚石复合片(PDC)进行了线切割加工实验,利用带能谱分析的扫描电子显微镜(SEM)观察了电极丝表面的显微形貌。从微观角度研究了PDC超硬材料电火花线切割加工的电极丝损耗机理,探讨了电参数和冲液条件等因素对电极丝损耗的影响。实验研究发现,采用贴附式高压喷液方式在高电压、小脉宽、大峰值电流的加工条件下,PDC切割效率为19.35mm2/min,电极丝损耗为1.5~2μm(104mm2切割量),较常压喷液方式切割效率提高51.6%,丝损降低15.2%。 相似文献
3.
4.
《现代制造技术与装备》2021,(2)
电火花线切割技术在冲压模具的加工中具有重要作用。在中走丝电火花线切割机床上,以脉宽时间、脉间时间、加工电流以及运丝速度等工艺参数为变量进行切割Cr12MoV模具钢的单因素试验研究。结果表明,各工艺参数中,运丝速度对切割速度的影响程度最大,而相比于对切割速度的影响,各工艺参数对表面粗糙度的影响稍小。此外,当脉宽时间为20μs、脉间时间为40μs、加工电流为7档以及运丝速度为3档时,可以达到最大的切割速度99.01mm~2/min和较小的表面粗糙度值2.904μm。 相似文献
5.
6.
进行了"中走丝机"切割镍基高温合金IN718各因素(脉宽时间、放电间隙、运丝速度和占空比)对切割速度及表面粗糙度影响的研究。通过单因素实验和正交实验的极差、方差分析,研究各参数对加工的性能指标的影响。实验结果表明:各参数对于切割速度和表面粗糙度的影响程度不同,其中脉宽时间和占空比对切割速度和表面粗糙度的影响显著,放点间隙对加工性能指标的影响最小。此研究为中走丝电火花线切割镍基高温合金IN718的加工工艺提供了参考。 相似文献
7.
8.
9.
10.
本文对较高厚度工件电火花线切割加工进行了加工试验,并研究了脉宽等有关参数对切割速度及粗糙度的影响,分析了较高厚度工件变形的防治措施. 相似文献
11.
K. Abdel Ghany H. Abdel Rafea M. Newishy 《The International Journal of Advanced Manufacturing Technology》2006,28(11-12):1111-1117
Zinc-coated steel sheets are important materials in the automobile and home appliance industries. Currently, lasers are the preferred tools for metal cutting because of their good cutting quality, flexibility and excellent features and results, as compared to traditional tools. The solid-state Nd:YAG laser has successfully replaced the gaseous CO2 laser for metal cutting; its small size and short wavelength makes it suitable for cutting bright and metal-coated materials, as well as being able to be transmitted via optical fibers and robots to cut complicated three dimensional and curved shapes. In this work, the Nd:YAG laser is used to cut 1 mm zinc coated steel sheets. We demonstrate the effects of different cutting parameters such as laser power, cutting speed, different gas types and pressures, and focus position on the cutting quality characteristics of attached dross, kerf width and cut surface roughness. Using a six axes robot, cutting speed was limited to 6 m/min because of the noticeable vibration at higher speeds. Results showed that the cutting surfaces achieved were very sharp and smooth. In cutting, Nd:YAG required less power and attained higher speeds than the published results of a CO2 laser, which makes Nd:YAG an economical alternative to cut zinc and metal-coated materials. In addition, laser cutting using robots provided efficient and consistent cutting quality, especially in the case of 3D and countered cutting. Apart from using low speed, robots proved to be more economical than costly, specially designed CNC tables. 相似文献
12.
13.
14.
Modeling and optimization of Nd:YAG laser micro-weld process using Taguchi Method and a neural network 总被引:1,自引:1,他引:0
Hsuan-Liang Lin Chang-Pin Chou 《The International Journal of Advanced Manufacturing Technology》2008,37(5-6):513-522
The use of a pulsed Nd:YAG laser in the 0.1 mm- thick aluminum alloy lap micro-weld process was optimized. The welding parameters
that influence the quality of the pulsed Nd:YAG laser lap micro-weld were evaluated by measuring of the tensile-shear strength.
In this work, the Taguchi method was adopted to perform the initial optimization of the pulsed Nd:YAG laser micro-weld process
parameters. A neural network with a Levenberg-Marquardt back-propagation (LMBP) algorithm was then adopted to develop the
relationships between the welding process parameters and the tensile-shear strength of each weldment. The optimal parameters
of the pulsed Nd:YAG laser micro-weld process were determined by simulating parameters using a well-trained back-propagation
neural network model. Experimental results illustrate the proposed approach. 相似文献
15.
Journal of Mechanical Science and Technology - This study proposes a multi-response optimization approach for the Nd: YAG laser cutting parameters of titanium superalloy sheet (Ti-6Al-4V). The... 相似文献
16.
17.
N Daikuzono S N Joffe H Tajiri S Suzuki H Tsunekawa M Ohyama 《Medical instrumentation》1987,21(5):275-277
Contact Nd:YAG laser surgery is assuming a role of greater importance in endoscopic and open surgery, allowing coagulation, cutting, and vaporization with greater precision and safety. A synthetic sapphire probe allows a wider angle of irradiation and diffusion of low power laser energy (less than 5 W) using an interstitial technique for producing local hyperthermia. Sensors placed directly into surrounding tissue or tumor continuously monitor temperature, and a pertinent computer program produces a controlled and stable temperature (e.g., 42 degrees C) over a period of time (e.g., 20-40 min). The Laserthermia system (Surgical Laser Technologies, Inc., Malvern, PA), using the Nd:YAG laser, offers many advantages in the experimental and clinical treatment of carcinoma by local interstitial hyperthermia. 相似文献
18.
Artificial sapphire probe for contact photocoagulation and tissue vaporization with the Nd:YAG laser 总被引:2,自引:0,他引:2
A contact artificial sapphire, developed for use with the Nd:YAG laser, allows the performance of open surgery (laser probe) and has endoscopic applications for the treatment of gastrointestinal bleeding (micro laser tip) and tumors (micro laser rod). Advantages of this contact irradiation include precision of surgical technique, minimal tissue damage, and excellent hemostatic and cutting capabilities, with low backscattering of laser energy. 相似文献
19.
Development of controlled Nd:YAG laser for medical applications 总被引:1,自引:0,他引:1
S R Mordon A H Cornil B Buys J P Sozanski J M Brunetaud Y Moschetto 《Medical instrumentation》1987,21(4):222-225
Several medical fields are concerned with applications of thermal lasers such as neodymium-doped, yttrium aluminum garnet (Nd:YAG), argon, and CO2. However, quantification of the necrotic volume of Nd:YAG laser-induced damage is not possible at the time of treatment. Mathematic models and feedback control can help to optimize Nd:YAG laser treatments. We therefore formulated mathematic models for coagulation processes and developed an intelligent Nd:YAG laser system with closed-loop feedback control. Surface temperature evolution proved to be valuable data for real-time control of coagulation and ablation. Infrared thermometry provided the noncontact measurement of temperature. A computer stored the temperature data calculated by the mathematic model. Deviations of surface temperature during the treatment beyond established tolerances causes the Nd:YAG laser system to adjust the laser power automatically. 相似文献