Takamatsu Machinery Co.

Takamatsu-shi, Japan

Takamatsu Machinery Co.

Takamatsu-shi, Japan
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Hasegawa A.,Kanazawa Institute of Technology | Kaneko Y.,Takamatsu Machinery Co. | Takasugi K.,Kanazawa Institute of Technology | Yoshimura F.,Kanazawa Institute of Technology | And 2 more authors.
International Symposium on Flexible Automation, ISFA 2016 | Year: 2016

In the present study, we describe a newly developed CNC lathe for realizing non-axisymmetric curved-surface-turning (NACS-turning). The newly developed lathe can be controlled along four axes (X1, X2, Z, and C) and has a three-linear-motor drive system for the X1, X2, and Z axes to control precise, high-speed motion. The tandem table unit, which moves along the X1 and X2 axes, can move at a maximum acceleration of 98.1 m/s2 synchronously with the spindle rotational position. Therefore, in order to realize high-speed cutting motion of a machining curved surface as well as suppress the vibration transmission, the inertial forces are made to cancel each other. In the present study, the fundamental dynamic performance and vibration suppression effects of the tandem table were examined. © 2016 IEEE.


Kato H.,Kanazawa Institute of Technology | Shikimura T.,Kanazawa Institute of Technology | Morimoto Y.,Kanazawa Institute of Technology | Shintani K.,Kanazawa Institute of Technology | And 2 more authors.
Key Engineering Materials | Year: 2012

Recently, cutting has replaced grinding in the finish processing of hardened steel. However, tool damage is a major problem in high-efficiency operations that use high-speed cutting and high feed rate conditions instead of the present cutting conditions. Therefore, the examination of a new cutting technique that can realize high-efficiency cutting is desired. In this study, the effects and efficiency of driven rotary cutting are investigated in the finish turning of carburized hardened steel. Based on the results, flaking occurs at the cutting edge at a short cutting length of 0.2 km using single-point turning. On the other hand, even if the cutting length amounts to 1.5 km, the tool wear width without flaking is small in the case of a driven rotary tool. Additionally, the tool wear is uniformly distributed along the circumference of the cutting edge. Furthermore, based on an examination of high-efficiency processing by increasing the feed rate, it is clarified that a feed rate of 0.3 mm/rev is the optimum condition from the viewpoint of wear resistance and surface roughness. Additionally, even if the cutting length amounts to 5.0 km for this condition, the flank wear width is as small as 0.04 mm, and the tool wear progresses gradually. © (2012) Trans Tech Publications, Switzerland.


Takasugi K.,Kanazawa Institute of Technology | Morimoto Y.,Kanazawa Institute of Technology | Suzuki N.,Takamatsu Machinery Co. | Kaneko Y.,Takamatsu Machinery Co.
Proceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2015 | Year: 2015

This study deals with non-axisymmetric curved surface turning (NACS-Turning) by a CNC lathe composed of a turning axis and two translation axes. We confirmed that NACS-Turning can be achieved with high efficiency compared with general methods. However, this novel turning method has inadequate machining accuracy. Therefore, this study developed an on-machine measurement method for improved machining accuracy in NACS-Turning. In this method, a line laser sensor measures the 3D profile of a machined workpiece, the profile is fed back to the CAM system, and the workpiece is reprocessed. In this paper, the system of on-machine measurement is explained, and its effectiveness is confirmed.


Morimoto Y.,Kanazawa Institute of Technology | Nakagaki K.,Takamatsu Machinery Co. | Kato H.,Kanazawa Institute of Technology
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) | Year: 2013

A new CNC lathe driven by a linear motor has been developed to realize the machining of complex nonaxisymmetric curved surfaces with rotational axis such as eccentric and spiral cylindrical volume, conical cams and artificial femoral stem. These have been realized by milling and/or grinding machines. In this case, there is a serious problem. It takes a long time to machine by milling or grinding. Furthermore, the machining point between a curved surface and a milling tool or a grinding wheel can be regarded as a single point contact just as same as lathe turning. We propose a new turning method that improves the productivity remarkably by using a driven rotary tool with its unique tool layout. In this report, the machining result of the curved surface by the proposed turning method and the feasibility are also reported. Copyright © 2013 by ASME.


Morimoto Y.,Kanazawa Institute of Technology | Emoto S.,Kanazawa Institute of Technology | Moriyama T.,Kanazawa Institute of Technology | Kato H.,Kanazawa Institute of Technology | And 4 more authors.
Procedia CIRP | Year: 2012

The machining of 3D curved surfaces with an un-axisymmetric axis by lathe turning is proposed considering the best machinable tool layout. The best offset tool layout from the central axis of a spindle enables us to machine curved surfaces and to obtain a long tool life for hard material workpieces using a rotary tool. A dedicated NC program for the 3D surface using the original CAM system has been developed and applied to what. The machining results and the validity of our system are evaluated in this paper. © 2012 The Authors.


Morimoto Y.,Kanazawa Institute of Technology | Moriyama T.,Kanazawa Institute of Technology | Emoto S.,Kanazawa Institute of Technology | Saito H.,Kanazawa Institute of Technology | And 3 more authors.
Procedia CIRP | Year: 2012

A new NC table driven by twin linear motors has been developed for us machining curved surfaces by lathe turning. This turning method enables us to machine the un-axisymmetric noncircular profiles with high acceleration and deceleration. The key factor for this turning method is to precise trace trajectories on a designed surface. The NC table requires a dynamic response that leads to a rapid motion with high acceleration and jerk. In this study, we propose a new NC table with acceleration and deceleration that exceeds 10 G with the use of a linear motor; this table enables high-speed contouring machining. Here, the fundamental performance of the table developed is reported. Motion and inertial forces are evaluated from the measurement results. The capability and effectiveness of the NC table developed for machining 3D surfaces are also reported. © 2012 The Authors.


Morimoto Y.,Kanazawa Institute of Technology | Suzuki N.,Takamatsu Machinery Co. | Kaneko Y.,Takamatsu Machinery Co. | Isobe M.,Takamatsu Machinery Co.
Journal of Manufacturing Science and Engineering, Transactions of the ASME | Year: 2014

A new computer numerically controlled (CNC) lathe with a pipe frame bed has been developed. This structure is expected to have enough space between the truss bars to solve the space problem and have enough rigidity for machine tools. Therefore, a CNC lathe whose frame consists of pipes, joints, and diagonal braces has been developed with enough rigidity and space utility for chip evacuation. From the viewpoint of machine tool usage, real-time vibration control theory is applied to control the relative displacement between the tool post and the spindle to suppress specific relative vibration modes. Copyright © 2014 by ASME.


Kato H.,Kanazawa Institute of Technology | Shikimura T.,Kanazawa Institute of Technology | Morimoto Y.,Kanazawa Institute of Technology | Shintani K.,Kanazawa Institute of Technology | And 2 more authors.
International Journal of Automation Technology | Year: 2013

Recently, cutting has replaced grinding in the finish processing of hardened steel. However, tool damage is a major problem in high-efficiency operations that use high-speed cutting and high-feed rate conditions instead of the present cutting conditions. Therefore, the examination of a new cutting technique that can realize high-efficiency cutting is desired. In this study, the effects and efficiency of driven rotary cutting are investigated in the finish turning of carburized hardened steel. Based on the results, flaking occurs when single-point turning is used at the cutting edge at a short cutting length of 0.2 km. On the other hand, even if the cutting length amounts to 5.0 km, the tool wear width without flaking is small in the case of driven rotary cutting. Additionally, the tool wear is uniformly distributed along the circumference of the cutting edge. Furthermore, based on an examination of high-efficiency processing by increasing the feed rate, it is found that a feed rate of 0.3 mm/rev is the optimum condition from the viewpoint of wear resistance and surface roughness. Additionally, even if the cutting length amounts to 5.0 km for this condition, the flank wear is as narrow as 0.04 mm, and the tool wear progresses gradually.


Takasugi K.,Kanazawa Institute of Technology | Nakagaki K.,Takamatsu Machinery Co. | Morimoto Y.,Kanazawa Institute of Technology | Kaneko Y.,Takamatsu Machinery Co.
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) | Year: 2014

This study developed a method called non-axisymmetric curved surface turning (NACS-Turning) for a CNC lathe composed of a turning axis and two translation axes. The NACS-Turning method controls the three axes synchronously. This new machining method can reduce the lead time for noncircular shapes such as cam profiles or pistons for internal combustion engines. In our previous report, we presented an outline of a machining principle and a CAM system for NACSTurning. However, at the same time, we found the problem that the X-axis slide exceeds the allowable acceleration. Therefore, it is preferable that the acceleration is verified during the cam application, and the tool path is generated within the allowable acceleration range. Therefore, this paper first describes the determination method of machinable conditions for NACSTurning in the cam application. Next, based on the result, relationships between the acceleration of the X-axis slide and machining conditions are clarified. Finally, the experimental procedure showed that our proposed method does not exceed the allowable acceleration of the X-axis slide. Copyright © 2014 by ASME.


Takasugi K.,Kanazawa Institute of Technology | Morimoto Y.,Kanazawa Institute of Technology | Nakagaki K.,Takamatsu Machinery Co. | Kaneko Y.,Takamatsu Machinery Co.
Journal of Advanced Mechanical Design, Systems and Manufacturing | Year: 2014

We have developed a new machining method which realizes turning of non-axisymmetric curved surfaces with a rotation axis (called NACS-Turning hereafter). NACS-Turning is a CNC turning method with 3-axis synchronous which is composed of a turning axis and two translation axes. This method forms a profile of a non-axisymmetric curved surface by adopting a liner motor in X axis and by synchronizing the X axis with the rotation axis at high speed. We confirmed dramatic improvement of productivity by using this machining method. However, at present, the generation of tool paths for shape forming using NACS-Turning are obtained with APIs associated with a commercial 3D-CAD program and geometric calculations. Therefore, we have developed a new CAM application for NACS-Turning in this paper. Since this machining method is three-axis simultaneous control, even though composition of the axis is the same as a general two-axis turning lathe, tool paths have to be generated in three dimensional space. Therefore, applying for a tool generation method of a machining center is required. Specifically, machining points are generated by calculating intersection lines on free surfaces as machining surfaces are calculated, and coordinates of tool center points are calculated by using the inverse offset method. In this paper, first, outline of NACS-Turning is mentioned. Next, the detail of the developed CAM system which is limited to a rotary tool. Finally, we report effectiveness by cutting experimentation. © 2014 The Japan Society of Mechanical Engineers.

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