GUNDRILLS
枪钻
Gundrills for
precision hole making
精密钻孔用枪钻
SINGLE FLUTE GUNDRILL 单槽钻
The single flute gundrill with its ability to machine very straight deep holes and hold excellent finishes, was originally developed for gun barrel manufacturing. Today, this tool is a general-purpose drill designed for deep hole drilling in virtually any material. The gundrill requires high-pressure coolant through the tool, keeping the cutting edges lubricated allowing for adequate chip evacuation down
the flute channel. Star SU’s Single flute gundrill product line diameter range is .078” [1.98mm] through 1.500” [38.10mm] as a solid carbide head. Larger diameter tools are available using a
brazed inserted blade design. All gundrills can be made to any specific length. Lengths over 72” [1828mm] will have an additional weld joint in the body of the tool. The gundrill is designed to drill holes from the solid, obtain bottom hole configurations, and assist in burr free intersections. The gundrill can achieve precision holes in one pass thus eliminating the need for secondary passes, and is a tool for consistent hole-to-hole reproduction. This tool is unique in its limitations, for machining deep holes are limited to the flute length not the depth of the cut. The design of the Single-Lip, straight deep “V” flutes and high coolant pressure allows for fast, consistent penetration without the need for pecking. Due to the point not being on center, the tool requires either a bushing or a pilot hole. Once into the cut, the tool is self-piloting. The additional advantages of a single flute gundrill:
Straightness tolerance of .001”
[0.03mm] per foot
Concentricity tolerances of .001”
[0.03mm] per foot
Finish hole diameters as good as
+/- .0005” [0.013mm]
由于单槽钻能加工笔直的深孔以及保持极好的抛光面，起初其被应用于枪管生产。如今它成了在几乎所有材料上钻深孔的通用工具。枪钻工作时需要有高压冷却剂，以保持切削刃光滑，并使碎屑沿槽道排走。斯达苏单槽钻产品系列的直径范围有：0.078"（1.98mm）到1.500"（38.10mm）（硬质合金头）。通过钎插刀设计，还可得到直径更大的。枪钻可制成任何特定的长度，但超过72"（1828mm）时在钻体上就需一个额外的焊接处。这种枪钻是用来从固体上钻孔，获得底孔构造以及辅助无毛口横切。它可一次性精确钻孔，无需重复，因此也是用于连贯钻孔的工具。这种枪钻独特之处就在于加工的孔深度不是由切削深度来决定而是由槽的长度限定。单口直深的"V"型槽和冷却剂高压是为快速连贯穿透，无需雕琢而设计的。由于点不在中心位置，这种钻还要有一个套管或者引导孔。一旦进入切口，其可自动上位。这种单槽钻的其它优势有：
直线公差0.001"0.03mm/英尺
同轴公差0.001"0.03mm/英尺
抛光孔直径+/-0.0005"[0.013mm]
DESIGN FEATURES OF THE SINGLE FLUTE GUNDRILL
Star has a wide range of contours/wear pads that gives the tool the burnishing effect needed to obtain the finish and hole size while controlling heat/friction for a given material. These features are strategically engineered per application down the outer diameter for the length of the carbide. Point angles and clearances play an instrumental part in the equation. The proper selection and reproduction of geometry is crucial to its total overall performance. These angles and clearances can be modified to change the cutting performance results and also assist in modifying the high-pressure coolant for better chip flushing or reducing the heat of the cutting edges. Every material has its own machinability characteristics. With five decades of design and manufacturing experience, Star SU’s gundrill engineering center allows designing the tool to custom fit each application.
单槽钻的设计特点
斯达苏有多种轮廓和耐磨垫，它们用来产生抛光效用以获得抛光面以及孔的尺寸，同时控制热和摩擦力。这些特点以及硬质合金外径长度都根据应用进行了战略设计。钻尖角和间隙在此种钻中起相当重要的作用。表面形状（布局及排列）的恰当选择及重现对枪钻的整体性能至关重要。通过改变这些角和间隙，可改变切削性能，而且能帮助改变高压冷却剂，进而更好的冲走碎屑，或者减少切削刃的热量。每一种材料都有其特有的切削特性。有着半个世纪的设计和生产经验，斯达苏枪钻设计中心能根据应用量身设计枪钻。
Star SU Single Flute Gundrill Used as a general-purpose tool in most drilling applications to obtain hole sized within .001”, run-out requirements of .001” per inch, straightness of .001” per foot. This tool is a single flute 3 piece constructions design and has the deepest flute channel, thus enabling maximum chip evacuation. Diameters are available from .0781 - 1.5”.
斯达苏单槽枪钻 作为通用工具主要应用于以下情况：钻孔尺寸在0.001" 以内，径向跳动要求0.001"每英寸，挺直度0.001"每英寸。这种枪钻是单槽三片组合设计，而且有着最深的槽道，因此能排走最大量的碎屑。直径从0.0781-1.5"都有。
Multi step gundrill Star®
step gundrills are used to produce holes concentric to one another. They can be provided in many diameters and step lengths, with a variety of forms on the steps. They are also used to cut a variety of materials. Consult engineering with regard to length of step and diameter ratio.
斯达苏多节枪钻 被用来产生同心孔。我们提供需多直径和节距以及各种节类型。它们还可用于切削各种材料。关于节距与直径比，请参考工程学。
DOUBLE-JET GUNDRILLS
Star SU with its years of experience in
Gundrilling developed a Star original patented
Double Jet Gundrill. The most critical interface
in which the carbide is subjected to the most
trauma, is during entry and exit of the part. This
is caused by the lack of lubricity to the cutting
edges. The double jet was designed to combat
this type of condition with its unique placement
of the coolant holes supplying adequate amounts
of coolant to the cutting edge while entering and
exiting the part.