Showing papers on "Tool wear published in 1969"
35 citations
TL;DR: In this article, several types of sensor for detecting tool wear of both on-line and semi-on-line performances are reported, and the proportionality constants of the relations between cutting forces and wear lands have a close and simple correlation with the physical properties of the work materials.
Abstract: Several types of sensor for detecting tool wear of both on-line and semi-on-line performances are reported. As for a parameter for an on-line sensor, variation of cutting force and relative displacement of machined surface due to flank wear have been experimentally proved to be adequate. The proportionality constants of the relations between cutting forces and wear lands have a close and simple correlation with the physical properties of the work materials. The continuous measurements of flank wear by way of the relative displacement of the machined surface are also highly reliable for an optimizing control of a lathe in view of tool life. In order to obtain more direct information of tool wear, an electro-optical measuring device has been also developed.
5 citations
4 citations
TL;DR: In this paper, a turning test was performed by a carbide tool on several carbon steels having various carbon contents and the worn surface of the tool and its cross-section were surveyed by the electron probe X-ray micro-analyzer in order to estimate the wear mechanism of carbide tools.
Abstract: Turning test was performed by a carbide tool on several carbon steels having various carbon contents and the worn surface of the tool and its cross-section were surveyed by the electron probe X-ray micro-analyzer in order to estimate the wear mechanism of carbide tools. Relation among the tool wear, cutting temperature, thickness of the diffused layer and the hardness of work material was investigated through the experimental findings concerning the decrease of cobalt content on the tool surface, the diffusion of carbon, and the weakening of tool.It is found that the tool wear is caused mainly by the diffusion of carbon from the carbide constituents of the tool material into the work steel, which changes the structure of carbides and weakens the tool crystals.From both the experimental data and the theory, it is proved that the wear velocity of carbide tool is resticted by the diffusion velocity of carbon through the matrix of the tool. And the thickness of the diffused layer beneath the tool surface increases as the cutting temperature is raised such that the hardness of work material is decreased, and as the carbon content of the work material is decreased.
1 citations
Patent•
03 Dec 1969
TL;DR: In this paper, a cam and cam follower structure are movable in either of two opposite directions to provide for adjustable movement of the tool in either direction through a predetermined incremental distance.
Abstract: Apparatus for periodically adjusting the position of a machine tool, such as a cutting tool, to compensate for tool wear and changing heat conditions, for example, to enable continuous accurate positioning of the tool. In response to a signal indicating the necessity for adjusting the position of the cutting tool, a cam and cam follower structure are movable in either of two opposite directions to provide for adjustable movement of the tool in either of two directions through a predetermined incremental distance. A clutch and brake assembly are sequentially operable to enable reversible adjustable movement of the tool. In addition, a manually rotatable shaft is operable to reset the cam and cam follower structure to a zero position.