By providing the highest quality gun drilling products and exceptional customer service, we have become one of the leading precision gun drilling manufacturing companies in the midwest. Gun drilling is possible over a range of depths and diameters. The obvious limitation with this type of installation is the depth of water it can operate in. Dec 05, 2016 gun drilling machinery is designed and constructed to produce deep holes beyond the limits of conventional twist drills.
The process is therefore increasing in popularity in the machining world. Deep hole drilling is used in a variety of materials from aluminum to superalloys, and is capable of achieving tight diameter control, straightness. The advent of more powerful propellants led to the need for stronger, more dependable steel barrels. The expensive regrinding process is eliminated thanks to. This is a mobile drilling rig, different from the semi submersible. Machining a material removal process in which a sharp cutting tool is used to mechanically cut away material so that the desired part geometry remains most common application. Quality improvement of deephole drilling process of aisi d2 article pdf available in international journal of advanced manufacturing technology 69912 december 20 with 1,958 reads. As such, deep hole drilling is a logical and efficient process for achieving precise drilling results. Arrow machine works provides deep gun drilling in a range from. Pdf effective coolant application is essential to prevent thermomechanical failures of gun drills. Cold rolled steel bar stock is doublestressrelieved before beginning the gundrillreamingrifling process to ensure uniformity, consistency, and strength. Pdf improving coolant effectiveness through drill design.
Bob hellinger, national sales manager of standard products for guhring inc. This series is our most popular series and has 100s of applications in dozens of industries. Hole drift can also be minimized by rotating the part in the opposite direction of the drill like some of our deep hole drilling machines. Drilling deep hole drilling gun drilling e f g j d rot eng rot eng rot eng drilling deep hole drilling gun drilling gun drills solid carbide heads 428. Parts of radial drilling machine heavy base vertical column horizontal arm drilling head 17. Deep hole drilling was first developed for the manufacturing of firearms, hence the name gun drilling. Tool sharpness, accuracy, tool and machine rigidity, machine spindle bearings wear, general quality of machine, use of drill fixtures, material thermal expansion, and material density variations are some to the reasons hole features will never be manufactured perfect. Deep hole drilling consists of bta drilling and gun drilling, with additional processes designed for specific tolerance objectives and generally performed on btastyle deep hole drilling machines. Deep hole drilling machines deep hole driling, gun drilling. Higher quality barrel blanks start with raw bar stock, most commonly in chrome moly or stainless steel materials, cut to length, and often chamfered before the gun drilling process begins.
Most cncers know about peck drilling to help with deep holes. Effective parameters for improving deep hole drilling process by. Venango machine company is located near erie, pa and is a leader in platen manufacturing and design. The positive effects of the gun drilling process are good surface quality, optimized alignment accuracy and low concentricity deviation. The tool selection and operation sequence is the same as a conventional. Gun drilling is an ideal solution for most deep and precision drilling projects. This high precision operation produces accurate, repeatable holes, with excellent surface finishes. Deep hole drilling gundrilling erie, pa venango machine. Deep hole drilling applications deep hole drilling machines. What is deep hole drilling unisig deep hole drilling machines. Machines are designed for 3 shift production mode and provide all the features for excellent output parameters like straightness, bore tolerance and surface finish.
Our deep hole drilling operating window is as follows. Drilled hole locations and size variations are cumulative of several manufacturing variables. Drilling operation an overview sciencedirect topics. The gun drilling process is ideal for smaller hole diameters, up to 50 mm 2. My first process that i tried was creating a 2 inch pilot hole then bored it just short of final dim, then drilling with an extended length drill to size. Deep hole drilling is a process many shops outsource, particularly when there is a need for bta drilling or the kind of very deep holes where dedicated deep hole drilling machinery really shines. Machining operations and machine tools turning and related operations drilling and related operations.
Heres your guide to deep hole drilling techniques from peck drilling, parabolic flutes, custom cycles, to gun or bta drilling. Fundamentals of petroleum engineering drilling operations. Go through the process of creating a custom deep hole. Our employees have accumulated over 100 years of precision deep hole drilling experience. The btasystem is a deep hole drilling system for special deep hole drilling machines with an external coolant supply and an internal chip removal single tube system. Most small diameter drills significantly benefit from solid carbide drills because they yield the maximum allowable surface footage and feed rates with decreased whip factor do the their rigidity. Tbt deep hole drilling tools, accessories and grinding machines. Our manufacturing organization has over 50 years experience in deep hole drilling gundrilling. Extreme drilling range, proprietary processes and equipment required. Gundrilling is a deep hole drilling process, often performed on precision equipment, that allows deeper holes to be drilled more accurately and effectively than with a standard machining center. The gundrilling process offers a few key advantages including much smaller hole sizes 2. Deep hole gun drilling midwest precision manufacturing. The gun drill was developed to drill such long, straight holes. Borehole cuttings are removed by continuous circulation of a drilling fluid as the bit penetrates the formation.
Modern gundrilling, also known as precision hole drilling, is a single machining technique for drilling holes in metals. A comprehensive guide on gun drills and gundrilling in traditional and nontraditional applications compiled in a handy 5. Gun drills hold location to precise tolerances, are sized to exact specifications, produce burr free holes, and can be formed to produce specific shapes in blind holes with minimal machine adaptation. The gundrilling process is commonly utilized on virtually any machine that. However, if your deep hole needs can be handled with a gun drill on a lathe competitively, its not that hard to bring the process inhouse. Gun drilling oil can be mixed and processed as toll blending product into a final product production. The hole is only drilled part way into the workpiece because it is only used to guide the beginning of the next drilling process. A material removal process in which a sharp cutting tool is used to mechanically cut away material so that the desired part geometry remains most common application. Gundrilling tools on high performance gundrilling machines. Originally developed to create or drill out barrels in guns made of steel, hence the term gun. Drilling fluid is pumped down through the hollow drill pipe using. May 23, 2015 radial drilling machine these are heavy duty and versatile drilling machine used to perform drilling operate on large and heavy work piece.
A gundrill tool uses a brazed carbide tip with throughtool coolant, and uses high pressure coolant to exhaust chips through a notch in the tool. Extremely deep holes and small diameter holes utilize gundrilling with specific equipment to maintain straightness and precision. Gundrilling, gunboring, deep hole drilling or whatever you call it, has come a long way over the years its valuable to know the history of the process in order to understand why it is the way it is, its current limitations, and its future possibilities. Gundrill machine with the exception that a pilot hole is needed to replace the starter bushing gdi to support the tool as it enters the part. Application advice for drilling depths in excess than 40 x d we recommend the use of two or more gun drills, e. The gundrilling handbooks a unique and comprehensive textbook which addresses all of the intricacies of a fairly complex manufacturing process. Carlson tool has specialized in deep hole drilling since 1964. Gun drills from sandvik coromant are easy to use and require no presetting. Pdf deephole drilling is a relatively complex drilling production process due to the highhole diameter to length ratio which makes the tool shaft. Deep hole drilling is generally achievable with a few tooling methods, usually gun drilling or bta drilling. Simply stated, precision hole drilling is a single machining technique for drilling holes in metals using a single lip cutting tool through which cutting oil is pumped.
Aug 03, 2012 animation of the deephole drilling residual stress measurement technique for measuring stresses through thick engineering components for use in structural integrity calculations. Gun drills for drilling depths of more than 40 x d should enter. How to make rifle barrel blanks gundrilling, reaming. So we order an eldorado single flute carbide gun drill in a hope to fix this problem. Early gun barrels were produced either by rollforging or damascus spiral welding. The gun drilling process differs from bta drilling due to coolant entry and chip removal. This series covers drilling range from o2mm to o40 mm and lengths of parts up to 1500 mm. Process of drilling overview of t he drilling process a borehole is drilled by rotating a bit at the end of a drill pipe. The majority of precision hole drilling machines built today rotate and feed the cutting tool into the stationary workpiece. Combined with todays technology, we go the distance to meet your hole drilling needs.
Animation of the deephole drilling residual stress measurement technique for measuring stresses through thick engineering components for use in structural integrity calculations. Gun drilling cnc horizontol drills noble precision. Tbt singlelip drills are made for every drill diameter. Pdf quality improvement of deephole drilling process of. Depending on the application, we offer several different types of gun drills to fulfill your machining requirements. Our solid carbide drills are manufactured through a new process using modern cnc equipment resulting in high quality and faster lead times. The drilling operation is conducted through a drilling riser, which is connected to a bop for well control.
The process uses a single lip cutting tool through which cutting oil is pumped under high pressure. The drilling riser can have an angle mainly due to the horizontal offset of the floating vessel, and the angle must be controlled to stay within a limit 9, as shown in fig. Instead of floating over its drilling location the jackup has long leg structures, which it lowers to and into the seabed raising the rig out of the water. Drilling is a standard process for producing holes in metal materials. Deep hole drilling is hard, and this article surveys the various techniques needed including peck drilling, parabolic flute drills, custom gcode cycles, and gun or bta drilling. Deep hole drilling deep hole drilling was first developed for the manufacturing of firearms, hence the name gundrilling. Pdf quality improvement of deephole drilling process of aisi d2. Best quality gun drilling oil, high grade gun drilling oil, leading manufacturers of gun drilling oil, leading suppliers of gun drilling oil, leading exporters of gun drilling oil. Deep hole highperformance solid carbide drilling youtube. To stay competitive in the gun drilling industry, we continuously invest in stateoftheart equipment and gun drill machinery. Some use high performance geometries like parabolic flute drills. Other considerations are roundness and surface finish.
With an increased hole depth the demands increase on both machine and tool. Necessary for suppling the coolant to the workpiece and for sealing off the process on workpiece and boring bar, requires the btasystem a pressure head boza. When ordering gun drills the following must be stated. Accordingly, the handbook has become, and remains, the sole reference manual youll appreciate and utilize time and again for as long as youre involved with the gundrilling process. Gun drilling is the ideal process for a range of deep hole drilled depths and diameters. Jul 18, 2016 tools and technologies for deep hole drilling last updated on 9232019 understanding the challenges of deep hole drilling and knowing how to select and apply the appropriate tools will help a shop profit from this operation. Pdf effective parameters for improving deep hole drilling. Contract drilling company deep hole drilling carlson tool. For diameters between mm, gun drilling can be performed successfully with special equipment.
275 442 262 214 134 454 895 1273 653 546 499 138 188 319 541 1456 1281 1488 1030 1024 64 1350 488 253 705 931 295 16 813 109 558