Computer Vision-Based Approach to End Mill Tool Monitoring

Monitoring quality of production processes is a complex task consisting of different measurements of product properties and process parameters, as well as visual checks and other activities. One of the most important measurement tasks is measuring complex product geometry. In order to get information about measured quantities as quickly as possible, measurements are made directly on the shop floor. However, assuring traceability of complex co-ordinate measurements in uncontrolled shop floor conditions is an advanced metrological task requiring special measurement standards and procedures. European project EMRP IND62 TIM that was agreed between EC and European metrology association Euramet is aimed to introduce a traceability chain into in-process geometrical measurements by offering different solutions for calibrating machine tools in harsh environmental conditions. One of the tasks of this project was to develop a highly accurate robust 1D measurement standard with very low expansion coefficient. The article presents basic design of this standard and experimental verification of its thermal expansion characteristics in a laboratory, as well as in harsh environment in production companies. Thermal expansion verification was performed by means of measurements on a co-ordinate measuring machine at different temperatures simulating real shop floor conditions.

“…The project aimed for assuring traceability of in-process measurements EMRP TIM [5] is already in the conclusion phase. Different standards were designed, manufactured and calibrated.…”

Section: Resultsmentioning

confidence: 99%

“…It is assured through organisational, executing and monitoring activities [1][2][3][4]. Most commonly applied process monitoring activities are measurements of product geometry and visual checks [5]. One of the most important measurement tasks is measuring complex product geometry.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Ball Bar Standard Thermal Properties by Simulating Real Shop Floor Conditions

Klobucar¹,

Ačko²

2016

“…Plus, the processing time depends on the performance of specific machines. In essence, the problem is equivalent to the optimization of the overall performance indices of the system by assigning the operations to machines, setting the start time of the operation, and determining the processing order [21][22].…”

Section: Problem Descriptionmentioning

confidence: 99%

Flexible Job-Shop Scheduling Problem Based on Hybrid ACO Algorithm

Wu¹,

Wu²,

Jing-Qi³

2017

For an enterprise to survive the fierce market competition, efficient production scheduling is a must as it improves economic efficiency and reduces cost. As an important branch of production scheduling, the flexible job-shop scheduling problem (FJSP) is a mixed blessing. It accurately reflects the characteristics of the actual production, but adds to the difficulties in problem solving. With the ant colony algorithm as the basic optimization method, this paper proposes the hybrid ant colony algorithm based on the 3D disjunctive graph model by combining the elitist ant system, max-min ant system and the staged parameter control mechanism, optimizes the FJSP problem to minimize the longest completion time, the early/delay penalty cost, the average idle time of the machine, and the production cost, and verifies the effectiveness of the model and algorithm by an example.

“…Owing to the development of modern technologies for manufacture of bio-compatible materials (CAM systems [11] and advanced additive manufacturing technologies [12,13]), the boundaries of RE application have been shifted towards medicine and dentistry.…”

Section: Introductionmentioning

confidence: 99%

An Approach to Modelling of Personalized Bone Grafts Based on Advanced Technologies

Budak¹,

Mirković²,

Šokac³

2016

Personalized bone grafts are one of the best examples of the latest achievements in the biomedical engineering. In the area of maxillofacial bone tissue reconstruction or jaw bone augmentation, their application has for some time been on the rise, and its ever increasing significance is driven by the growing technical support. One of the key segments is the bone graft modelling customized to suit patient's specific needs, since it greatly determines not only the future anatomic functionality but also the acceptance probability of the graft by the bone tissue. With the graft geometry importance in mind, presented in this paper is an approach to personalized bone graft modelling. The approach is based on application of modern computer-aided systems and methods, and enables efficient geometric design while minimizing the risk of errors during modelling and placement stages. Verification is based on a case study of a personalized bone graft designed for a patient requiring mandible augmentation.