Drilling is a process of cutting that employs drill bits to cut through or to enlarge holes of circular cross-section in solid materials. Drill bits are usually rotary, multipoint cutting tools. The tool is pressed against the surface that needs to be drilled and rotated at rates ranging from a few hundreds to several thousands of revolutions in a minute. Drilling in Florida is done by experts to achieve the highest level of quality of possible.
Drilled holes are characterized by sharp edges on the entrance and blurs on the exit side. Helical feed marks are also observable inside the hole. Most drilling operations produce circular holes. However, with modern technology, specially-shaped drill bits exist, which can produce non-circular cross-sections. For example, square cross-sections can be achieved in holes drilled.
This process has negative effect on the mechanical properties of workpieces because it creates low residual stresses in the area surrounding the opening of a hole. There is formation of a thin layer of highly stressed and disturbed material on the new surface. Vulnerability to corrosion and crack propagation of the workpiece is increased by the disturbance and stress. Finish operation can be done on the surface to avoid this problem.
There are some drill bits which are fluted and the chips are ejected through the flutes. The kind of chips produced depends on the nature of material that is being drilled. Chip type may also depend on material machinability and process parameters. Poor material machinability is indicated by long chips.
Whenever possible, one should always ensure that the hole being drilled is perpendicular to the workpiece surface. The purpose of this is to reduce the tendency of the drill bit to deflect from the intended center-line. Such deflection may cause the drilled hole to be misplaced. The tendency to deflect increases with the increase in the length-to-diameter ratio of a drill bit.
Prevention of drill bits from deflecting can be achieved in various ways. Among these methods are casting marks in workpieces, spot facing, spot drilling, and center punching. Drill bushings and drill jigs may also be utilized in constraining drill bit into a particular location. All these techniques ensure that the center mark is identified before drilling begins. That way, its hard to lose the center line.
The drill bit needs to be cooled when working and this is done using cutting fluid. Cutting fluid also increases speeds and feeds, surface finish and tool life. It also aids in the process of ejecting chips from the tool. Cutting fluid may be applied in the form of spray mist or may be flooded on the workpiece.
The market today has many different kinds of drills. One should choose the drill to use after they evaluate the task at hand first. Different tasks are best served by different drills. Some among the types of drills in use include indexable, spade, and subland drills. Larger holes are made by spade drills while subland drills make holes of variable diameters. Indexable drills are good for managing chips.
Drilled holes are characterized by sharp edges on the entrance and blurs on the exit side. Helical feed marks are also observable inside the hole. Most drilling operations produce circular holes. However, with modern technology, specially-shaped drill bits exist, which can produce non-circular cross-sections. For example, square cross-sections can be achieved in holes drilled.
This process has negative effect on the mechanical properties of workpieces because it creates low residual stresses in the area surrounding the opening of a hole. There is formation of a thin layer of highly stressed and disturbed material on the new surface. Vulnerability to corrosion and crack propagation of the workpiece is increased by the disturbance and stress. Finish operation can be done on the surface to avoid this problem.
There are some drill bits which are fluted and the chips are ejected through the flutes. The kind of chips produced depends on the nature of material that is being drilled. Chip type may also depend on material machinability and process parameters. Poor material machinability is indicated by long chips.
Whenever possible, one should always ensure that the hole being drilled is perpendicular to the workpiece surface. The purpose of this is to reduce the tendency of the drill bit to deflect from the intended center-line. Such deflection may cause the drilled hole to be misplaced. The tendency to deflect increases with the increase in the length-to-diameter ratio of a drill bit.
Prevention of drill bits from deflecting can be achieved in various ways. Among these methods are casting marks in workpieces, spot facing, spot drilling, and center punching. Drill bushings and drill jigs may also be utilized in constraining drill bit into a particular location. All these techniques ensure that the center mark is identified before drilling begins. That way, its hard to lose the center line.
The drill bit needs to be cooled when working and this is done using cutting fluid. Cutting fluid also increases speeds and feeds, surface finish and tool life. It also aids in the process of ejecting chips from the tool. Cutting fluid may be applied in the form of spray mist or may be flooded on the workpiece.
The market today has many different kinds of drills. One should choose the drill to use after they evaluate the task at hand first. Different tasks are best served by different drills. Some among the types of drills in use include indexable, spade, and subland drills. Larger holes are made by spade drills while subland drills make holes of variable diameters. Indexable drills are good for managing chips.
About the Author:
If you are looking for information about drilling in Florida, go to our web pages online here today. Further details are available at http://www.skinnerhorizontal.com now.
Post a Comment
Post a Comment