RESULTS OF EXPERIMENTAL STUDIES OF THE USE OF A BRUSHLESS ELECTRIC MOTORIN SEEDING DEVICES OF ROW-CROP SEEDERS OF THE MS TYPE

This paper presents the data of comparative studies of the characteristics of the Mxus XF15R brushless elec-tric motor (rotation speed; consumed current, power and efficiency) depending on the maximum torque. The de-sign of the stand for studying the characteristics of the seeding process when using an electric drive of the seed-ing disc is presented; the key elements of the stand are: the seeding section, seeding disc, electric motor connect-ed to the seeding disc, the control unit, the source of rare-fied pressure, the seeding disc speed sensor and the seeding sensor. The technique of working with the stand and the procedure for setting it up are described. During the operation, the following indicators are taken into ac-count: control signal of the seeding disc drive; seeding disc and rotor revolutions, rpm; the number of the seed in the total volume from the moment of measurement; time between seeds falling, ms; vacuum, kPa; hole diameter, mm; reference time between the fall of adjacent seeds at a given rotational speed of the seeding disc, ms. During the experiment, it was found that with a value in the seed-ing chamber of 5 kPa, in the frequency range of the seed-ing disc from 17-100 rpm, the actual seeding rate was 3.28 pcs m, the number of twins in the seeding process was 8.17%, the number of gaps in the sowing process was 5.46%, and the deviation from the set rate was 5.2%. Thus, the electric drive of the seeding disc based on the brushless DC motor XF15R Mxus has shown its efficiency and may be used in the existing configuration of the MC type sowing device.

Computational and Experimental Investigation of Contact Detect Response of a Head-Integrated Thermistor on HAMR vs. PMR Media

The migration from perpendicular magnetic recording (PMR) to heat-assisted magnetic recording (HAMR) in the hard disc drive (HDD) industry brings unique challenges for head-disc contact detection (CD) and with precisely setting head-disc clearance. In this study we provide numerical model calculations of a head-integrated thermistor’s electric resistance as a function of head-disc clearance and compare the modeled results with measurements of thermistor resistance for heads flying over PMR and HAMR media. Such comparisons serve to assess the accuracy of the modeling techniques and to understand the impact that the media type plays in CD capability of the head-integrated thermistor.

Evaluation of properties of AISI 431Grade Stainless Steel by Vacuum Annealing Process

The wear behaviour of AISI 431stainless steel was investigated at consistent load under a dry sliding touch with vacuum annealing device. The approach implemented was found to have been effective in improving the wear actions of stainless steel products, advancing the pliability properties. For Vacuum Annealed (VA1) 2 hours, Vacuum Annealed (VA2) 4 hours and Vacuum Annealed (VA3) 6 hours respectively, a low temperature heat treatment was performed on sample for the maximum annealing cycle. Untreated stainless steel (UNT) was used as a kind of viewpoint tool for contrast with specific hardening samples and conducted wear checks. The hardening samples show certain hard formed layers which enhance the hardness of the surface. Estimations of small scale toughness showed a crucial improvement in toughness following operation. This method raises the hardness of the substance up to 150 percent. A pin on the disc drive is used to do wear checking to assess wear failure. The layers were represented by optical lens magnification and the examination of electron magnifying glass.

Assessment of AISI 431Grade Stainless Steel properties by Vacuum Tempering Process

The wear behaviour of AISI 431 stainless steel was examined under a dry sliding touch at compatible load with the vacuum tempering cycle. The method adopted was found to be effective in enhancing the wear conduct of stainless steel products, there by advancing the pliability quality. For the sample, vacuum tempering (VT) procedure for (VT1) 2 hours, (VT2) 4 hours and (VT3) 6 hours respectively, a low temperature heat procedure was performed. Untreated stainless steel was used as a kind of viewpoint tool for contrast with specific hardening samples and observed wear check. The hardening samples expose those moulded hard layers which improve the hardness of the surface. Predictions of small scale hardness showed a significant change in hardness during diagnosis. This operation improves the hardness of the material to up to 150 percent. For wear inspection, a pin on the disc drive is used to assess wear failure. The layers were observed by optical lens magnification and examination under electron magnifying lens.