※一部利用できない機能があります
| 1.
論文 |
論文
|
酒井, 忍 ; 山崎, 光悦 ; 鈴木, 武之 ; 中野, 正貴 ; 浅田, 浩治
概要:
Crankshaft miller is a machine tool used to mill crankshafts for engines. The miller causes a great amount of heat durin
…
g the cutting process, which combines heavy and intermittent cutting. In this paper, the approximation equation of thermal displacement which applied a method to estimate thermal deformation on the basis of a few machine temperatures and the finite element analysis is proposed. The thermal characteristics and the mechanisms of heat transformation in the crankshaft miller are made clear by numerical simulations using the finite element models of the miller and the experiments. The simulations tried a steady and transient state analyses of heat transformation to consider the heat transfer coefficient in the cutting process. From the results of the analyses, the temperature distribution and thermal deformation on each part of the miller were found. The results of analyses are compared with the experimental values using the actual miller. The point of efficient measuring temperature and the calorific values in order to revise each coefficient value in the approximation equation were examined. Additionally, the effectiveness of proposed approximation equation was shown. © 2011 The Japan Society of Mechanical Engineers.
続きを見る
|
||||
| 2.
論文 |
論文
|
立矢, 宏 ; 平田, 紘規 ; 須摩, 貴嗣 ; 金子, 義幸 ; 中垣, 勝敬 ; 石野, 嘉章
概要:
As heat sources of a compact CNC lath are closely-arranged, they would cause large and complicated thermal deformation.
…
Thus, compact CNC lathes often arrange the heat sources and so on to reduce thermal deformation. The lathes taking such arrange into consideration can show high-precision work under stable environment. On the other hand, it would cause large thermal deformation at unstable environments. Previously, we proposed a simple method to compensate thermal deformation of CNC lathes by measuring temperatures at a few points such as spindle and tool. In order to apply similar method to a compact type lathe, we evaluated its thermal deformation. As a result, the thermal deformation of the evaluated machine is affected by the hydraulic unit as well as the spindle part. Thus, we tried to approximate the thermal deformation caused by the hydraulic unit and the spindle part respectively. Then, those thermal deformations can be expressed by simple equations. Furthermore, we applied these equations to compensate thermal deformation of the lathe. As a result, it is confirmed that the work error can be reduced under various conditions. © 2013 The Japan Society of Mechanical Engineers.
続きを見る
|
||||
| 3.
その他 |
その他
|
増田, 健一 ; 立矢, 宏
概要:
This study presents a simple method to compensate the thermal deformation by measuring temperatures at only a few points
…
on a CNC lathe. Approximate functions are derived for the compensation from the thermal deformations of a head stock and a ball screw, which can be considered as the main factor to cause the thermal deformation of a lathe. The approximate formula of the thermal deformation about the headstock is derived as a function of the temperatures measured at a few points and the rotational speed of the main spindle. Furthermore, the approximate formula of the thermal deformation of the ball screw is likewise derived as a function of the temperatures of the ball nut. By using the estimation value of the thermal deformation obtained from both the approximation functions, the study confirms the work error is well compensated.<br />日本機械学会年次大会講演論文集 : JSME annual meeting 2009(4), pp.237-238 (2009-09-12)に掲載.
続きを見る
|
