著者

貝原 俊也 白瀬 敬一 藤井 信忠

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.75, no.10, pp.1153-1157, 2009-10-05 (Released:2011-02-07)

参考文献数

17

著者

新野 俊樹 山田 英典

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.75, no.12, pp.1454-1458, 2009

被引用文献数

1 4

---

A novel process that can fabricate transparent parts was developed for the purpose of improving mechanical and thermal performances of functional and transparent prototypes which is provided through an additive manufacturing technology. The process starts with plastic laser sintering process, which is widely applied to fabrication of functional prototype or rapid manufacturing, and following infiltration of the sinter, which is opaque after the first process, with thermosetting plastic of which refractive index after cure is tuned to have the same value as that of the sintered powder clearly eliminates opacity from the sinter. Experiments using styrene-methacrylate copolymer as powder material and thermosetting epoxy resin were carried out, and the minimum haze of 20% (at 5mm in thickness) was obtained. In terms of mechanical strength, impact strength (unnotched Izod) reached 3.5kJ/m² meeting standard of that for transparent grade stereolithography parts. In this paper, requirements both in laser sintering and infiltration, and problems to be solved to improve the mechanical strength are also discussed.

著者

山倉 英雄 田村 利夫 桝田 正美

出版者

公益社団法人精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.61, no.1, pp.147-151, 1995-01-05

被引用文献数

6 5

---

This paper deals with a new truing technique for grinding wheels in which cutting edges on the grinding wheel are machined and lapped in a newly designed ultra-precision grinding machine. The newly developed grinding machine has a measuring device for cutting edge height and rotating spindles for a grinding wheel and a workpiece. Each spindle stiffness is 1 kN/μm. After applying the newly developed truing process to a #1500 diamond grinding wheel on the grinding machine, the number of accumulative cutting edges below 0.5 μm depth from the outmost wheel surface were increased by more than 32 times compared to conventional truing process. In-feed grinding achieved a surface roughness of 7 nmR<SUB>max</SUB> in ductile mode on optical glass BK 7 by a #1500 diamond grinding wheel with cutting edges of unified height.

著者

新井 初雪

出版者

公益社団法人精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.73, no.7, pp.756-759, 2007-07-05

被引用文献数

3 3

著者

太田 圭一 松原 厚 水山 元

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.80, no.9, pp.856-861, 2014-09-05 (Released:2014-09-05)

参考文献数

6

---

Machine tool assembly is dynamic and complex because of intrinsic uncertainties in its process. Human dependent production system is often used to deal with uncertainties, but it also increases complexity. Significant research about production scheduling has been done, but effectiveness of its application to human dependent production system is not investigated enough. In addition, not only scheduling but also other countermeasures are applied to improve production performance. This paper presents a framework to analyze how machine tool assembly system responds to supervisors' instruction. The framework includes an event driven simulation, and the simulation model is generated by the facts observed at the real machine tool assembly site. The simulation results reveal conditions which enable to improve production performance effectively at machine tool assembly site.

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.80, no.9, pp.838-838, 2014-09-05 (Released:2014-09-05)

著者

広瀬 茂男

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.78, no.1, pp.18-22, 2012-01-05 (Released:2012-07-05)

参考文献数

5

著者

稲葉 清右衛門

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.70, no.4, pp.483-483, 2004-04-05 (Released:2009-04-10)

著者

林田 宣宏 矢向 高弘 村上 俊之 大西 公平

出版者

公益社団法人精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.67, no.11, pp.1834-1838, 2001-11-05

参考文献数

5

被引用文献数

12 13

---

A bilateral robot is one of the remote control robots. By implementing the force feed back, it is possible for the operator to have the sense of the touch. But the force sensor is affected by unknown disturbance such as its temperature variation and so on. For that reason, it is not expected to use the force sensor at the extreme situation. In the sensorless approach, the reaction torque observer is used. But the reaction observer is easy to be influenced of the friction. This makes it difficult to estimate the external force. To address the above issue, this article proposes a twin drive system. This system is composed of two motors and one differential mechanism. It is required to control two motors for two degrees of freedom. To consider the above issue, two virtual motors are proposed. One is deal with the output control and the other is for friction compensation. The twin drive system brings a sophisticated ability to the system, which is a reduction ability of the friction. By using this system, it is possible to realize the remote control robot, where the operator can feel the obstacle which the slave robot touches. This system may help the remote control work more skillfully. The validity of the proposed method is confirmed by the experimental results.

著者

水野 有智 木下 裕介 和田 春菜 福重 真一 梅田 靖

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.78, no.9, pp.798-804, 2012

被引用文献数

1

---

Developing scenarios is a hopeful approach for drawing visions and pathways of sustainable manufacturing toward sustainable society. Sustainable Society Scenario (3S) Simulator is an integrated design support environment that supports understanding, describing, and analyzing scenarios. This paper proposes a design support method of scenarios in 3S Simulator. Proposed method supports designing scenarios in forecasting manner, in which futures are explored starting from the present. We employ two-leveled causal networks for supporting scenario design in structuring ideas and describing the structured ideas into a scenario, by expressing the structure of the object world of the scenario. In the case study, we verified that the outlines and details of a scenario are deployed from the causal networks. Using 3S Simulator, the relationship between the causal networks and the descriptions of a scenario is clarified. This supports a designer to understand the scenario rationally. As the conclusion, proposed method supports designing scenarios in forecasting manner.

著者

楜澤 信 城山 厚 早瀬 仁則 初澤 毅

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.67, no.7, pp.1096-1100, 2001-07-05 (Released:2009-04-10)

参考文献数

8

---

This paper proposes a method to measure surface profiles of flat glasses by using a shadow image generated by the surface corrugations. When a point light is projected to a screen through the glasses, surface corrugations work as lenses to modulate contrast on the screen. Peaks on the glass surface give brighter regions and valleys gives darker regions, so brightness profiles on the screen agree to surface profiles. Contrasts of shadow images are predicted by an optical theory and lens model of surface profiles. The predictions agree to experiments for various optical positioning and installation angle. High contrast profiles of shadow images do not always give high similarity to the surface profiles because of the blur for too strong lens effect and resolution limit. On an allowable condition, three samples are measured whose surface profiles have peak-to-valley corrugation of 10-65 nm. For each sample, both surface profiles and brightness profiles give similar waveforms. An error of 5 nm is defined from the difference between both profiles for a pitch of 1 mm. This simple method can be applied to measure the surface profiles of flat glass with high accuracy.

著者

宮下 武彦 村社 純一

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.78, no.5, pp.355-358, 2012-05-05 (Released:2012-05-09)

被引用文献数

1 1

著者

上田 完次

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.76, no.7, pp.737-742, 2010

被引用文献数

1

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.89, no.12, pp.898-900, 2023-12-05 (Released:2023-12-05)

著者

月崎 竜童 岡田 則夫 中坪 俊一 加賀 亨 松井 大樹 青山 正樹 武田 洋一 馬場 満久

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.86, no.9, pp.653-657, 2020-09-05 (Released:2020-09-05)

参考文献数

5

著者

河村 幸二

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.79, no.5, pp.388-391, 2013-05-05 (Released:2013-11-05)

参考文献数

4

被引用文献数

1

著者

石井 明

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.84, no.12, pp.963-966, 2018-12-05 (Released:2018-12-05)

参考文献数

6

被引用文献数

2 3

著者

新田 雄久

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.56, no.1, pp.74-75, 1990-01-05 (Released:2009-06-30)

著者

葭仲 潔 鈴木 潤 東 隆 高木 周 宮田 哲郎 松本 洋一郎

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.81, no.4, pp.303-307, 2015-04-05 (Released:2015-04-05)

参考文献数

23

著者

清水 政行 川西 康友 出口 大輔 井手 一郎 村瀬 洋

出版者

公益社団法人 精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.87, no.5, pp.447-454, 2021-05-05 (Released:2021-05-05)

参考文献数

32

---

Estimation of translation between consecutive frames, i.e., odometry, plays an important role in autonomous navigation. This paper presents an odometry estimation method using sparse LiDAR points and image feature points. In case of sparse LiDAR measurements, it is difficult to accurately estimate depth at image feature points. Image feature points with low-accuracy depth cause misconvergence in odometry optimization. To improve the robustness to the misconvergence, a new method with a Gaussian process that estimates not only the depth at image feature points but also the variance is proposed. By using this variance, it estimates the residual of image features in the world coordinate with depth, or in the image coordinate without depth. This allows more accurate and robust estimation than conventional methods in case of sparse LiDAR points. In an experiment with simulated sparse LiDAR points from the KITTI dataset, the proposed method is confirmed to estimate the odometry more accurately than conventional methods.