Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Powiadomienia systemowe

Sesja wygasła!

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: mining drills

Sortuj według:

Ogranicz wyniki do:

Influence of the drill bit tip geometry on the rotary drilling process performed with a hand-held hydraulic drill

Bołoz Łukasz

Production Engineering Archives

2023

Vol. 29, Iss. 3

304-310

In the mining and construction industries, hand drills are used to carry out many processes related to excavation and auxiliary works. Hand drilling is commonly applied for making small diameter holes, especially in hard-to-reach places. In the case of manual drilling, an important parameter is drilling resistance, especially torque. Drilling tools are subject to wear, which has a negative impact on the process of drilling, including resistance and efficiency. A blunt tool lowers the drilling speed and puts more strain on the operator. The article presents the results of laboratory tests of selected parameters of the drilling process carried out with a hydraulic rotary drill. The tests were performed with the use of new drill bits as well as drills characterized by a various degree of wear. The tests were carried out for popular, frequently applied rotary drilling tools, on a unique laboratory stand that enabled setting the feed force and measuring the torque, rotational speed, drilling path, drilling speed as well as the in and out pressure of the drill. A number of characteristics were determined as a function of time and depth of the drilled hole. It was found that tool blunting affects the drilling process in various ways, whereas the intensity of this influence is determined by the type of blunting. The test results can pro-vide a basis for developing a criterion for replacing a drill bit with a new one.

Umacnianie wierteł górniczych metodą nagniatania strumieniowego

Ciecińska B., Zielecki W.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2001

z. 55 [185]

13-22

W artykule przedstawiono problemy wytwarzania wierteł górniczych. Poruszane zagadnienia są związane z procesem kształtowania półfabrykatów - sześciokątnych prętów - oraz z dalszym przebiegiem procesu technologicznego. Zwrócono uwagę na negatywny wpływ niektórych operacji technologicznych na wytrzymałość zmęczeniową wierteł górniczych i żerdzi. Zaproponowano obróbkę pneumokulowaniem jako metodę wyraźnie poprawiającą wytrzymałość zmęczeniową wierteł udarowych i zmniejszającą chropowatość powierzchni.

Some problems of manufacturing of mining drills are presented in the paper. The regarded problems concerns forming prefabricated products i.e. hexagonal iron and the following manufacturing process. Negative effect of some operations on fatigue strength of mining drills has been indicated. Shot peening has been suggested as the operation significantly increasing fatigue strength of mining drills and decreasing surface roughness.