mohsen sadr

The effect of texturing the tool rake surface on the surface quality in hard turning of 1191/1 steel with a surface hardness of 45 HRC was studied in this research. The pattern parameters including, cavity diameter, pitch, and depth, as well as the pattern distance from the main cutting edge were changed in 3 levels, assuming the cutting tool with regular cavity texture. Nine tests were designed using the Taguchi DOE and conducted in dry and lubricated conditions with 2 repeats. Machining forces during the tests and surface roughness of the machined workpieces were measured in machining under lubricated and dry conditions. The results showed that in turning with a textured tool under lubrication, changing the parameters of the texture pitch and the distance from the cutting edge increased the surface roughness of the workpiece by 57.6% and 39.2%, respectively. This is while the increase in the diameter of the tissue cavity, due to the reduction of the contact area in the tool-chips interface and better lubrication near the cutting region, improved the surface roughness up to 40.7%. The cavities depth of also did not have a significant effect on improving lubrication and reducing the roughness of the final surface. In dry turning, increasing the cavities diameter in texture and decreasing the pattern pitch, reduced the surface roughness by 10.6% and 29%, respectively. Examining the SEM images also indicated the production of the workpiece surface with smoothed texture when turning using optimized textured tool.

In this article, the effect of creating a surface pattern on the expression of cutting has been studied. More precisely, the effect of the texture created by laser engraving on the values of machining forces was investigated in different states, and these tests were performed both in the presence of lubricant and in its absence. The parameters of depth, pitch, texture diameter and distance from Cutting edges were considered as tool texture parameters. A total of 9 experiments were conducted using the Taguchi test design method. Lubrication in both textured and non-textured tools reduced the machining force by 30-35%. In the end, the machining forces obtained from the test were compared with textured and non-textured tools in the presence of lubricant, and it was observed that due to texturing of the tool, the machining force decreased by about 28%.

The purpose of this paper was to identify and categorize cultural organizations according to the viewpoint of organizational population ecology. The exploratory mixed method based on repertory grid approach has been used. All isfahanian cultural experts were been considered as Statistical population that were been sampled in two stage (qualitative and quantitative). the data gathering method in qualitative phase was interview and in quantitative phase by compilation the questionnaire, elements (organizations) were been scored based on the Likert spectrum and the necessary data were collected and idio-grid software was used for data analysis. The fitting indices such as Cronbach's alpha index (0.78 for constructs and 0.73 for elements), Bieri index(0.36), Fransella index(0.38) were calculated, which showed reliability and validity of repertory grid process based on the method. in the qualitative phase, 19 constructs have been investigated and in the quantitative phase 11 constructs in 3 dimensions(as named: survival and relationship, isomorphy and cultural originality) determining 76.87% of total variation were categorized and were used as typology basis . Finally, researchers based on the final constructs shaped the two-dimensional diagram and categorizes four different types of cultural organizations with their specific characteristics. Originality and Innovation: The present research has originality and innovation in three aspects, the ecological approach of organizational population and the new method was used in typology and Quantifying the experts' mind map based on accurate statistical approaches.