https://escholarship.org/content/qt4h56k1ch/qt4h56k1ch.pdf

Advanced monitoring of machining operations

Advancing EDM through fundamental insight into the process

https://escholarship.org/content/qt8rf718jm/qt8rf718jm.pdf?t=krnesf

Recent Advances in Mechanical Micromachining

Vibration-assisted machining (VAM) combines precision machining with small-amplitude tool vibration to improve the fabrication process. It has been applied to a number of processes from turning to drilling to grinding [9] , [36] . The emphasis on this literature review is the turning process where VAM has been applied to difficult applications such as diamond turning of ferrous and brittle materials, creating microstructures with complex geometries for products like molds and optical elements, or economically producing precision macro-scale components in hard alloys such as Inconel or titanium. This review paper presents the basic kinematic relationships for 1D (linear vibratory tool path) and 2D VAM (circular/elliptical tool path). Typical hardware systems used to achieve these vibratory motions are described. The periodic separation between the tool rake face and uncut material, characteristic of VAM, is related to observed reductions in machining forces and chip thickness, with distinct explanations offered for 1D and 2D modes. The reduced tool forces in turn are related to improvements in surface finish and extended tool life. Additional consideration is given to the intermittent cutting mechanism and how it reduces the effect of thermo-chemical mechanisms believed responsible for rapid wear of diamond tools when machining ferrous materials. The ability of VAM to machine brittle materials in the ductile regime at increased depth of cut is also described.

Review of vibration-assisted machining

Manufacturing and measurement of freeform optics

Generation of 5-Axis Control Collision-Free Tool Path and Postprocessing for NC Data

Concerning robot teaching, an online teaching method has conventionally been carried out by skilled workers using a teaching pendant. However, the teaching pendant is different with every robot manufacture and requires a large number of man-hours to assign a large number of points in defining the tool path for deburring. In recent years, use of an offline teaching method that utililises a three-dimensional robot simulation system has begun to spread, however, this is not necessarily easy to introduce in medium- and small-sized businesses. Thus two kinds of teaching support devices were developed from actual workpieces and deburring tools to prepare the tool path, considering the volume of investment for equipment and training of operators. One is a three-wire type teaching support device, and the other an arm type one. The former consists of tension wires supported at three points like a kite, and the latter consists of two arms and six connecting axes. Each device can measure the position and posture of a dummy tool in the device’s coordinates. From the experiments, the arm-type teaching support device shows enough precision capability as a teaching support device, as opposed to the three-wire type teaching support device, which is cost-effective.

Development of robot teaching support devices to automate deburring and finishing works in casting

Creation of V-shaped microgrooves with flat-ends by 6-axis control ultraprecision machining

This study deals with the automation of polishing work by use of an industrial robot with 6 degrees of freedom. Since polishing work, which takes much time, requires experience, patience and skill, it is manually performed by skilled workers. This study aims at rationalizing such difficult polishing work by introducing a robot and CAD technology. The arm of the robot can be equipped with two kinds of polishing tools, i.e., a rotational tool or an ultrasonic vibrational one, to cope with various cofigurations of the workpiece surface. In addition, the system allows collision-free polishing paths derived from the CAD system to be expressed in the robot coordinate system by use of a touch sensor. The system is found to be effective for obtaining a smooth workpiece surface, based on several experimental results.

/pdf/automation-of-polishing-work-by-an-industrial-robot-system-4op2kckg6q.pdf

Yoshimi Takeuchi

Papers

Recent Advances in Mechanical Micromachining

Generation of 5-Axis Control Collision-Free Tool Path and Postprocessing for NC Data

Development of robot teaching support devices to automate deburring and finishing works in casting

Creation of V-shaped microgrooves with flat-ends by 6-axis control ultraprecision machining

Automation of Polishing Work by an Industrial Robot : System of Polishing Robot