Спеціальні засоби та методики

Permanent URI for this collection

https://elar.naiau.kiev.ua/handle/123456789/25656

Browse

Browsing Спеціальні засоби та методики by Issue Date

Filter results by year or month
Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    ДОСЛІДЖЕННЯ ЗУБОХОНІНГУВАННЯ ЗУБЧАСТИХ КОЛІС ПІСЛЯ ШЕВІНГУВАННЯ І ТЕРМООБРОБКИ. STUDY OF GEAR HONING OF COGWHEELS AFTER GEAR SHAVING AND HEAT PROCESSING
    (2019) Кривошея, Анатолій Васильович; Kryvoshe³a, Anatolii; Возний, В'ячеслав Вікторович; Voznyi, Viacheslav; Мельник, Володимир Євгенович; Melnyk, Volodymyr; Підгаєцький, Михайло Матвійович; Pidhaietskyi, Mykhailo
    Research paper considers a new method of gearing cylindrical gears, after gear shaving and heat processing with worm diamond elastic hones. The main disadvantages of the existing methods of gearing honing are given. The main advantage of the new method of gear honing is that serial milling or grinding machines can be used to implement it. To ensure spring linkage in the system tool–detail a special device has been developed. As a tool, a specially developed diamond elastic worm hone instead of a disk hone was used. The use of worm hone equalized the cutting speed of the gear height and significantly reduced the dynamic load while gear honing, compared with the disk gear hone. The characteristics of the diamond worm hone, the modes and quality of machining gears are stated. To assess the quality of machining gears, the surface roughness parameters were used, which were measured before gearing honing. For measuring the roughness of the surface of gear honing, a complex was created by measurement with data output to a computer. The complex is connected to a computer, which allows to automatically obtain the following roughness parameters: Ra, Rq, Rt, Rz, Rc, Rsm, as well as the supporting curve. The roughness was measured both along the involute profile and along the honing line of the cogwheel. For statistical assessment of the results, the roughness supporting curves were constructed before and after processing. From the analysis of the scattering curves, it was found that the roughness of the surface of the gear wheels after gear honing can be reduced by 2–3 times. In addition to providing roughness parameters, the process of gear honing allows correcting local defects (cracks) of the profile. All gears after the gearing are recognized as suitable ones for the construction of hydraulic machines. The conclusions and perspectives of further research are presented.
  • Thumbnail Image
    Item
    МОЖЛИВОСТІ ВДОСКОНАЛЕННЯ ТЕХНІЧНОГО ЗАБЕЗПЕЧЕННЯ ЕКСПЕРТНО-КРИМІНАЛІСТИЧНИХ ПІДРОЗДІЛІВ МВС УКРАЇНИ ДЛЯ ВИКОНАННЯ СУДОВО-БАЛІСТИЧНИХ ДОСЛІДЖЕНЬ. OPPORTUNITIES FOR THE IMPROVEMENT OF TECHNICAL SUPPORT OF THE EXPERT-CRIMINALISTIC DEPARTMENTS MIA UKRAINE FOR THE FULLFILLMENT OF FORENSIC AND BALLISTIC RESEARCHES
    (2019) Вересенко, Юрій Віталійович; Veresenko, Yurii
    The testing department of the State Research Institute of the Ministry of Internal Affairs of Ukraine is accredited by the National Accreditation Agency of Ukraine for competence and independence in accordance with the requirements of DSTU ISO / IEC 17025: 2006 (General Requirements for the Competence of Testing and Calibration Laboratories), has the status of conformity assessment body in fields: testing of armor, weapons, special non-lethal weapons, ammunition and structurally similar items, pyrotechnic articles. For the control of the ballistic stability of personal protective equipment (bulletproof vests and bulletproof vest elements, shields and helmets bulletproof), protective glazing, protective structures (parts and components), protection of armored specialized vehicles, riflescale shotguns, smooth barrels of the appropriate caliber, which provide the required, determined by regulatory documents of Ukraine, the speed of the bullet and cartridges of the industrial production. Necessary weapons or ballistic barrel are grounded on the developed and patented at the State Research Institute of the Ministry of Internal Affairs of Ukraine weapons for remote shooting weapons [1]. The scope of use of this device is not limited to the ballistic tests of armor protection conducted in the State Research Institute of the Ministry of Internal Affairs of Ukraine, but may be used, for example, in the Expert Forensic Departments of the Ministry of Internal Affairs of Ukraine. One of the most important issues raised by a forensic expert is the determination of the propriety of improvised firearms and ammunition and their suitability for firearms and ammunition. In this regard, the Methodology for establishing the object of a firearm and its suitability for firearms (hereinafter – Methodology) contains relevant regulations. Thus, in particular, Clause 3.1 of the Methodology provides that the object of the requirement to firearms is determined by the presence of a set of a number of common forensic features: Clause 7.4.8 of the Methodology contains the relevant regulations, it is mentioned that the experimental firing is carried out by use of a remote control firing, equipment (devices) to determine the flight speed of shells or their kinetic energy and a bullet trap or target that provide effective inhibition of projectiles fired from small arms. In our opinion, the solution of this problem and, consequently, the improvement of the technical support of conducting dynamic tests during the performance of forensic ballistic investigations, consists in the cooperation of the units of the Expert Service of the Ministry of Internal Affairs of Ukraine with the State Research Institute of the Ministry of Internal Affairs of Ukraine (hereinafter – the Institute).