Operation indices of the new cored wire of Fe−C−Si−Мn−Сr−Ni−Mo system

To protect and repair details of equipment, subjected to abrasive and shock-and-abrasive wear, a build-up of hard alloy is widely used to increase the wear resistance of details, operating under abrasion conditions. Cored wires of Fe−C−Si−Мn−Сr−Ni−Mo system of type A and B by MIS classification are the main wires used for wear-resistant build-up in Russia. For effective application of building-up wires it is necessary to know the dependence of built-up layer hardness and its wear resistance on mass share of elements included into the composition of the cored wires systems. Influence of chemical composition of he built-up layer, obtained by the building-up with application of new powder systems of Fe−C−Si−Мn−Сr−Ni−Mo, protected by RF patents, on its physical and mechanical properties studied. Based on the results of the multifactor correlation analysis accomplished, dependences of the built-up layer hardness and its wear resistance on mass share of elements included into the composition of the cored wires of Fe−C−Si−Мn−Сr−Ni−Mo system determined. The dependences obtained were used for forecasting of the built-up layer hardness and its wear resistance at changes of the chemical composition of the built-up layer. The tests of JOY 4LS20 mining machine screw protective plates at Kemerovo region mines, built-up by the elaborated cored wire, showed an increase of the resistance by 19.3% comparing with the analog plates built-up by DRATEC wire.

LABOR AND FINANCIAL COSTS IN TREATMENT OF DENTOALVEOLAR ANOMALIES IN THE PERIOD OF THE MIXED OCCLUSION

The aim of the present study is to analyze the complexity and cost of modern methods of orthodontic treatment of children during the period of replacement bite. The study of the duration and frequency of visits to the doctor the orthodontist with the use of technology 2x4, removable plates with artificial teeth, ring spacer, plate from the front Nakonechny pad and plate valve for the language of the Twin-block appliance, mask dilara combined with the expanding apparatus, plate screw, machine screw hyrax expansion. Based on the complexity of the calculated salary orthodontist doctor, medical and other personnel. The cost of consumables at the clinical and dental stages was determined by taking into account the purchase prices and the cost of a specific manipulation by weighing or measuring. Calculated the expenditure on maintenance of workplaces of the doctor and dental technician in the calculations of the required funding early orthodontic treatment used more information about the structure and prevalence of orthodontic pathology in children in the period of the mixed occlusion. It was found that the complexity of modern orthodontic treatment during the period of replacement bite varies from 5.55 hours (spacer with a ring in case of premature loss of a temporary tooth) to 10.73 hours in the treatment of distal bite with the twin-block device. The cost of orthodontic treatment during the period of replacement bite ranges from 12.6 thousand rubles (spacer with a ring in case of premature loss of a temporary tooth) to 33.4 thousand rubles in the treatment of mesial bite using a dilyar mask in combination with an expanding apparatus. Taking into account the prevalence of dentoalveolar anomalies in children during the period of replacement bite, the necessary financial costs for orthodontic treatment per one examined child and per child with a dentoalveolar anomaly reach 30 and 40 thousand rubles, respectively.

ANALISIS KEANDALAN (RELIABILITY) PADA MESIN SCREW PRESS (STUDI KASUS : PT. PERKEBUNAN NUSANTARA XIII)

The machine is one of the main factors of production whose role is very important in order to produce a product that conforms to the specifications set by a machine, with the amount and capacity of the machine's production. Reliability is the design of a component so that components can work according to function, without any failure, in accordance with the process already set. Screw press is a fitting machine used to squeeze moss brondolan ripe with press system and used to separate crude oil from crushed flesh (mesocarp) by squeezing. Research done on Screw Press machine that its role is quite high in PT. Perkebunan Nusantara XIII. The method used is Reliability with MTTR Method. From the calculation results obtained reliability value Screw Press engine in 2015 has the highest reliability value of 1.6408 at the time of calculation of 383.75 hours and in 2016 has a reliability value of 0.7239 at the time of calculation 415.83 hours. Screw Press engine reliability value in 2016 is higher than 2015, it is proven that the life of Screw Press engine in 2016 is more dominant than in 2015. The higher the reliability value the better the machine used in the operation process. Keywords : Reliability, Weibull, MTTR, Machine Screw Prees