Abstract As a starting point in equipment manufacturing, sawing plays an important role industrial production. Intelligent manufacturing is carrier of intelligent technologies. Due to the backwardness technology, comprehensive performance equipments China obviously different from that foreign countries. State art advanced investigated along with technical bottleneck machine tool and new scheme ...

nowadays, by successful application of on time production concept in other concepts like production management and storage, the need to complete the processing of jobs in their delivery time is considered a key issue in industrial environments. unrelated parallel machines scheduling is a general mood of classic problems of parallel machines. in some of the applications of unrelated parallel mac...

One of the most crucial factors involved in the optimum design and cost estimation of rock sawing process is the rock abrasivity that could result in a significant cost increase. Various methods including direct and indirect tests have been introduced in order to measure rock abrasivity. The Schimazek’s F-abrasiveness factor ( ) is one of the most common indices to assess rock abrasivity.  is t...

Abstract Sawing variation (SV), the degree of deviation from a specified target lumber size, is an unavoidable component sawing process. SV influenced by several factors such as machine, material, set works, feed and cutting parameters. To account for these resulting in deviations desired thickness cut must be increased that only minimal number boards less than thickness. Thus, greater amount S...

A human skeleton was found in a forest after an aging time (laydays) of nearly three years. Surprisingly a larger number of living maggots crawled out of the medullary cavity of the humerus after sawing it longitudinally. Investigations of other long bones showed remnants of maggots, fly-pupas and maggot-excrements in similar cases. A humerus is found after an estimated aging time of over 100 y...

A new method for creating microcantilevers in glass allows integration of optical waveguides and Bragg gratings. Devices are fabricated by high precision sawing, followed by direct UV writing of waveguides with Bragg gratings and then chemical etching to release the freestanding glass structures. Optical measurement of the Bragg gratings together with piezo-actuation allows the mechanical reson...

In this paper we describe G/G/R+s multi- repairmen machining system with balking. The system consists of M operating machines, S spare machines, R permanent and s additional repairmen. Assuming the discrete flow of machines by continuous one, the diffusion approximation technique for the machine repair system has developed. The system will be in normal working mode if there is M operating machi...

maintenance process is one of the most necessary processes in every organization, whose main task is maintaining machines in desired conditions or restoring machines from non-optimal (nonoperational)conditions to optimal (operational) conditions. machines failure would result in loss of machines availability time, and rise of both organization costs and production time. also, it may cause irrep...

—A three-dimensional (3D) log sawing optimization system was developed to perform 3D log generation, opening face determination, sawing simulation, and lumber grading. Superfi cial characteristics of logs such as length, large-end and small-end diameters, and external defects were collected from local sawmills. Internal log defect positions and shapes were predicted using a USDA Forest Service ...

The planning of how hardwood logs can be sawn to improve recovery of high-value lumber has always been hampered by the limited information provided by external defects, and whatever internal defects are eventually revealed on the cut log faces by the sawing pattern. With expanded markets, lower-quality logs, increased competition from non-wood products, social pressures to manage public lands f...