Effect of offset on the blade stress in tube roll-cutting process
The main objective of this study is to obtain the reasonable range of offset in tube roll-cutting process by analyzing the effect of the process kinematics. For this aim, the roll-cutting processes are simulated. Due to the existence of the offset, the relative feed speed of blade is not constant. In this paper, the relationship between the radial feed speed shock of a blade relative to the tube and the offset is introduced. The effects of offset on the roll-cutting force and the blade stress have been analyzed. Regarding the stress of the blade, the offset should be less than 0.15mm for Φ76×3.5mm tube with the blade radial displacement per cycle as 1.0 mm.
Simulation Based Process Parameters Study of the Tube Roll-cutting
In the large-diameter tube product line, the tube roll-cutting induces the tube shrinkage. The dashing blade is vulnerable part in the cutting machine. To decrease the tube shrinkage and increase the blade working life, the cutting processes with various process parameters are simulated by using the FEM. This paper is concerned with the quantitative effect of process parameters on the tube rollcutting. The considered parameters are the initial feed speed and the maximum cutting force. A comparison between the numerical and experimental results proves the validity of simulation. The relationship between the tube shrinkage and the process parameters is obtained by studying the cut dimension. The result of the stress analysis shows the influence of process parameters on the stress value. The appropriate process parameters are recommended through comparison among the simulated results for cutting Φ76×3.5mm tube.
MENTAL HEALTH CASE MANAGEMENT IN CANADA: JOB DESCRIPTION ANALYSES
The purpose of this study was to examine case managers' (CM) job position descriptions through content analysis. There were 29 case manager job position descriptions examined. The job descriptions could be grouped into four categories: (1) what the individuals should bring to the position, (2) what they did as CM, (3) to whom they were accountable, and (4) what was valued. Themes included focus on client as individual, focus on the external/system, or outer-directed work, and the articulation point between the individual and broader system. The CM works directly and indirectly in the system and community through education, organizing, planning, and networking, as well as through provision of direct care to the individual client. The expectations of the positions are extensive.