We propose a new grinding processing method with a dual-axis-driven grinding wheel for drilling of CFRP. Although we evaluated the processing characteristics of the SiC-grinding wheel, only a maximum ...of 20 holes could be drilled due to clogging of the wheel. Then, we evaluated the durability of the grinding wheels using two types of electroplated grinding wheel. The results of processing experiments showed that durability of both grinding wheels was higher than the SiC-grinding wheel.
The aim of this research was to develop an efficient and accurate method to fabricate a dental implant surgical guide. The surgical guide is adapted from the patient's vacuum-formed clear template ...with the use of a plate with three ceramic balls, a six-axis drilling machine and its fixture. The plate, with the ceramic balls used as radiographic markers, is glued to the template, and the patient bites this template during a CT scan. Then, the surgeon can plan the locations and orientations of the implants on the CT-based model in the dental planning software. The drilling information is exported directly to the computer-controlled drilling machine for subsequent drilling on the template to complete the surgical guide. This method allows the surgical guide to be made without any measurements, which reduces the fabrication time, but increases the drilling accuracy. The preliminary results show that the average location error was 0.31 ± 0.17 mm and the average orientation error was 0.53 ± 0.24°, which can be considered accurate in comparison with the results reported in the literature.
Problems with the conventional linear aerostatic guideway for a PCB drilling machine include deviation from straightness or parallelism tolerance between the granite guideways, and thermal expansion ...caused by the heat generated from ball screw and the driving system. These factors will result in vibration and affect the positioning accuracy during machine drilling.
This paper describes the development of the resistance network method (RNM) for analyzing the static behaviors of aerostatic grooved thrust bearing designed with a disk-spring compensator to hold the table in a suitable position. Comparison is demonstrated between the RNM results and experimental data. Finally, a realizable application of these types of bearing to the linear guideway system for a PCB drilling machine is presented.
This paper designed a semi-automatic drilling machine used in flange hole processing. The drilling machine consists of rotary power head, power head straight reciprocating device, rotary indexing ...table, positioning clamping device. Rotary power head is driven by the motor, and realize the rotary motion through the gear driving. Power head straight reciprocating device, rotary indexing table, positioning clamping device driven by the hydraulic cylinder, to achieve the semi-automatic of the flange hole processing cooperate with the PLC sequence control function. It has short design cycle, low investment, high efficiency and smooth hydraulic actuator with the generic parts of modular machine tool. Combined with programmable controller to realize the sequence control. And it will be easy to operate, operate reliable and with high efficiency.
はじめに硬質な岩盤の掘削では、発破掘削がおこなわれる事が一般的である。一方、掘削範囲以深、すなわち基礎掘削面以深には発破影響がないことも望まれる。本報告では、基礎掘削面以深における発破影響の確認事例を紹介する。紹介する内容は、以下の2点である。① 基礎掘削面以下の状況確認は、ボアホールカメラを用いたが、この際の観察孔は、装薬孔削孔に用いられるパーカッション削孔機による孔である。 ② ...側方解放面がない場合は、掘削範囲以深へも一定の影響があったが、側方解放面がある場合は、基礎掘削面以深への影響は極微少であった。 パーカッション削孔機による孔を用いた意味一般にボアホールカメラによる調査・観察は、調査ボーリング孔（φ66mm～）が用いられる。しかし、これから掘削しようとする現場で仮設足場などを必要とする通常のボーリング調査の場合、迅速性、費用の面で大きな負担となる。一方パーカッション削孔機は、発破掘削の装薬孔を削孔するため、現場にすでに存在する機器であり、これがボアホールカメラ観察孔として使用できるということであれば、迅速性、費用の面で有利である。今回、十分に使用可能であることが確認された。未公表の事例が存在する可能性はあるが、有用な情報と考えこの状況を報告する。 発破影響確認結果発破影響の確認結果は、図－1のとおりである。 ① 側方解放面がない場合は、掘削範囲以深へも一定の影響があった。 ② 側方解放面がある場合は、基礎掘削面以深への影響は極微少であった。
Laser galvanometric scanning system has been widely used in the laser drilling machines to form the microvias of high-density interconnected printed circuit boards (HDI PCBs). Although the ...galvanometric scanning system can increase the speed and efficiency of laser drilling process, it is usually associated with a field distortion error. The investigation discusses the field distortion error of a laser scanning system based on a CO
2 laser drilling machine and provides a method for correcting this distortion error. The field distortion error is a random error in the laser galvanometric scanning system. This irregular error is usually corrected using pre-compensation methods that apply an error function. The paper gives a pre-compensation technique to correct the distortion error of scanning image, which using the two-dimensional (2D) Lagrangian polynomials modified the control commands of the galvanometric scanning system. The results in this study indicate that the compensation method effectively amended the field distortion and increased the accuracy of the positioning of the holes that were drilled using a laser galvanometric scanning drilling machine. The positioning errors of drilling holes have reduced from ±0.3 to ±0.05
mm after error compensation. This pre-compensation method could be widely adopted in all galvanometric scanning system, such as pre-objective and post-objective scanning system.
A constraint condition finite element analysis mode of the high speed PCB drilling machine Z-axis bottom plate was established on the platform of Abaqus. And then an optimal structural mode of a ...Z-axis supporting plate was obtained by means of performing constraint modal analysis and dynamic analysis optimization on the structure of the Z-axis supporting plate. modal tests and analyses were performed on the Z-axis plate before and after the optimization with the application of an LMS vibration/dynamic signal acquisition and analysis system. The experimental results were shown that the tested Z-axis plate dynamic characteristics were basically consistent with the obtained Z-axis supporting plate mode from simulation analyses using the finite element software Abaqus. It was proved that using the finite element software was feasible for optimizing the Z-axis supporting plate structure.
Based on pile foundation construction of No. 6 main pier, deep mudstone geological foundation and deep-water construction in Nanjing-Dashengguan Yangtze Bridge, the method of super-large-diameter ...bored pile in deep water is studied. The spread drill, application of PHP mud, and choice of machine are solved by adopting two machines of KTY4000 and KPG300A. Besides, the airlift reversing circulation is selected in slag discharge. The results show that this method can ensure successfully the construction of pier foundation to satisfy the demands of codes.
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