1. Perforating device for simultaneously punching at least two holes in paper, comprising a housing (1, 2) with a desktop contact surface (9) ; a rocker (3) having a touch surface (31) and swivel-mounted in the housing (1, 2) ; at least two punching bolts (7) operated by the ...
Effect of Thermal Drilling Modes for Making Holes in Barely Deformable Materials Exerted on Tool Wear This paper presents the results of experimental studies on the process of thermal drilling in workpieces made of barely deformed alloys by the example of t... DM Zabelyan,IA Burlakov,DE Gordin,...
A method for drilling holes into a mantle of a cylinder of a paper machine while the cylinder is in its site of operation in the paper machine. The holes are drilled into the cylinder mantle by a drilling device having drill bits and whi... JAAKKO REIVO,SEPPO PARVIAINEN,JOUKO PELKONEN,...
Machining of hard-to-machine materials is encountered in many hi-tech areas of industry. One of the most common but also very demanding manufacturing tasks is drilling deep holes of small diameter in materials. In this paper an experimental study of drilling small and deep holes with a continuo...
The drill jig for drilling holes in the pipe comprises a base and a clamp connected thereto with possibility of vertical displacement, on which angled grooves oppositely arranged for fastening the pipe. On the clamp a jig bushing for the drill entry is fastened symmetrically to said grooves. On...
This paper proposes ECD of small holes with real-time flowrate control to improve the uniformity of electrolyte flowrate in each tube electrode and reduce the fluctuations in the electrolyte flowrate. In single-hole drilling, when the electrolyte flowrate was regulated in real time, the hole ...
Bone hole diameter as a function of drill guide length and drilling method in rigid internal fixation This study examines drill guide length and drilling method to see which technique produces the most accurate hole diameter. Two hundred twenty-five holes w... RC Robinson,EL Mosby,J David Eick...
2.boring machine for making drill holes in rock or coa在岩石或煤上打孔用打孔机 3.Perforator: Key board which produces prunched paper tape.打孔机:把纸带打孔的键盘。 4.A hole or passage made by or as if by use of a drill.钻孔,打洞用或似用钻打孔或通道 5.Register punch: Precision punchi...
This is a bulk mining method that utilizes large diameter holes and mines successive cuts remotely by blasting and cratering the bottom of the drill holes. The ore body is mined from the bottom up. The method in turn has required a......
PURPOSE:To prevent buckling or wear of a punch and to overcome the problem of short life of a metal mold, by using a push punch for taper holes and a die with escape hole. CONSTITUTION:The punch 1 having a tip portion 1D with taper 1a is pressed downward so as to descend, while sli...