GUNDRILLS
槍鉆
 

Gundrills for
precision hole making
精密鉆孔用槍鉆

SINGLE FLUTE GUNDRILL 單槽鉆
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]
由于單槽鉆能加工筆直的深孔以及保持極好的拋光面，起初其被應(yīng)用于槍管生產(chǎn)。如今它成了在幾乎所有材料上鉆深孔的通用工具。槍鉆工作時(shí)需要有高壓冷卻劑，以保持切削刃光滑，并使碎屑沿槽道排走。斯達(dá)蘇單槽鉆產(chǎn)品系列的直徑范圍有：0.078"（1.98mm）到1.500"（38.10mm）（硬質(zhì)合金頭）。通過釬插刀設(shè)計(jì)，還可得到直徑更大的。槍鉆可制成任何特定的長度，但超過72"（1828mm）時(shí)在鉆體上就需一個(gè)額外的焊接處。這種槍鉆是用來從固體上鉆孔，獲得底孔構(gòu)造以及輔助無毛口橫切。它可一次性精確鉆孔，無需重復(fù)，因此也是用于連貫鉆孔的工具。這種槍鉆獨(dú)特之處就在于加工的孔深度不是由切削深度來決定而是由槽的長度限定。單口直深的"V"型槽和冷卻劑高壓是為快速連貫穿透，無需雕琢而設(shè)計(jì)的。由于點(diǎn)不在中心位置，這種鉆還要有一個(gè)套管或者引導(dǎo)孔。一旦進(jìn)入切口，其可自動(dòng)上位。這種單槽鉆的其它優(yōu)勢(shì)有：
直線公差0.001"0.03mm/英尺
 同軸公差0.001"0.03mm/英尺
 拋光孔直徑+/-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.
單槽鉆的設(shè)計(jì)特點(diǎn)
 斯達(dá)蘇有多種輪廓和耐磨墊，它們用來產(chǎn)生拋光效用以獲得拋光面以及孔的尺寸，同時(shí)控制熱和摩擦力。這些特點(diǎn)以及硬質(zhì)合金外徑長度都根據(jù)應(yīng)用進(jìn)行了戰(zhàn)略設(shè)計(jì)。鉆尖角和間隙在此種鉆中起相當(dāng)重要的作用。表面形狀（布局及排列）的恰當(dāng)選擇及重現(xiàn)對(duì)槍鉆的整體性能至關(guān)重要。通過改變這些角和間隙，可改變切削性能，而且能幫助改變高壓冷卻劑，進(jìn)而更好的沖走碎屑，或者減少切削刃的熱量。每一種材料都有其特有的切削特性。有著半個(gè)世紀(jì)的設(shè)計(jì)和生產(chǎn)經(jīng)驗(yàn)，斯達(dá)蘇槍鉆設(shè)計(jì)中心能根據(jù)應(yīng)用量身設(shè)計(jì)槍鉆。

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”.
斯達(dá)蘇單槽槍鉆  作為通用工具主要應(yīng)用于以下情況：鉆孔尺寸在0.001" 以內(nèi)，徑向跳動(dòng)要求0.001"每英寸，挺直度0.001"每英寸。這種槍鉆是單槽三片組合設(shè)計(jì)，而且有著最深的槽道，因此能排走最大量的碎屑。直徑從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.
斯達(dá)蘇多節(jié)槍鉆  被用來產(chǎn)生同心孔。我們提供需多直徑和節(jié)距以及各種節(jié)類型。它們還可用于切削各種材料。關(guān)于節(jié)距與直徑比，請(qǐng)參考工程學(xué)。
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.