Каталог Sumitomo сверла и развертки - страница 116

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SumiDrill WDX Type ■ Lathe Machining Guidelines ■ Drill installation Internal bore smaller Internal bore larger ・Set the drill so that the outer insert is parallel to the machine X axis. (See Fig. 1) ・Press the end of the flanged of the drill tightly against the face of the holder when tightening the bolt. ■ Adjusting work diameter (offset) Central ・The work diameter is adjustable by moving the machine X axis. Insert Machine X axis Peripheral Insert ・Make the adjustment by moving the X axis positive (enlarge the bore diameter). Moving the X axis in the negative direction (to reduce the bore diameter) is not recommended as the holder may interfere with the hole. (See Fig. 1) ・The maximum allowable adjustment (offset) differs depending on the drill diameter. Refer to the Radial Offset (Max) in the Holders charts on pages J86 to J92. Fig. 1 ■ Other notes ・When the drill is mounted on a lathe, the center of the central insert is designed to be 0.15 to 0.2 mm below the center of the spindle. ・If the spindle deviates off center so far that the center of the central insert lies above the spindle center, the central insert will break. ・Set the depth of cut for turning or internal boring work to 1/5 or less of the drill diameter (Max 5 mm or less). (Ex: Set depth of cut to 4 mm or less for a drill diameter of ø20 mm) Fig. 2 ・Install a cover to prevent injury from possible chip fly-out (see disc-shaped chip in Figure 2) when through boring on a lathe. ■ Typical Power Ratings ■ Typical Coolant Volume 12 40 f 0.24 Coolant Volume ( ℓ /Min) 35 For drill diameters ø18.5 to 55 mm, 10 f 0.12 For drill diameters ø13 to 18 mm, coolant pressures of at least 1.0 MPa is recommended. PowerRating (Kw) f 0.18 30 coolant pressures of at least 2.0 MPa is recommended. 8 25 6 f 0.06 20 Coolant Volume 15 Recommended 4 2 10 5 Minimum Discharge 0 10 15 20 25 30 35 40 45 50 55 0 10 15 20 25 30 35 40 45 50 55 Drill Diameter (DC) Drill Diameter (DC) ● Power ratings are subject to change based on conditions such as work ● Coolant volume is a factor that affects drilling performance, material and cutting speed and should only be used for reference. particularly with respect to chip evacuation and lubricity. ● Cutting Conditions (Reference) ● Coolant pressure should be set higher for smaller diameter Work Material: S50C (230HB) drills. (ø18.0 mm or smaller) Cutting Speed: vc=150m/min ● Coolant volume is usually adjusted by changing the coolant pressure provided on most CNC machines. ● This table provides guideline values only. More coolant may be required depending on the machine, coolant, and work material. ■ Notes on Attaching and Removing Inserts J ・Before attaching the insert, remove all traces of foreign matter on the insert seat using air or other means. Proper Wrench Usage Properly Attached Insert ・When using the wrench, align it to the axis of the screw and press while turning. (Figure 3) If the wrench is not aligned with the screw, the insert screw will be loose Outer Insert Central Insert Drilling and the tip of the wrench and/or the Torx hole of the screw may become deformed. ・Do not allow clearance between the insert seat and drill when attaching the insert. (Figure 4, A) Figure 4 shows a properly attached insert. * It is normal for the outer sides of the central insert to have clearance because it is Clearance is normal and Solid clamped at its center, butted to the rear. Fig. 3 䠝 䠝 does not affect use. Fig. 4 Special Indexable ■ Troubleshooting Reamer Problem Symptom Cause Countermeasures Drilled hole is larger than desired ・Deflection of the holder due to ・Decrease the feed rate to decrease the thrust force. Brazed high thrust force ・Make an adjustment on the X axis. Others Too much variation in hole diameter Drilled hole is smaller than desired ・The cutting edge does not enter ・Increase the feed rate. into the workpiece but backs off ・Make an adjustment on the X axis. Pronounced difference in hole size at ・Packing of Chips ・Increase the feed rate to improve chip evacuation. entrance and bottom ・Use L type chipbreaker. Poor drilled surface from entrance to ・High cutting resistance ・Decrease the feed rate. bottom of hole ・Low rigidity of workpiece ・Review tooling to improve rigidity. Poor or rough drilled hole surface quality Poor drilled surface at bottom of hole ・Machined surfaces damaged ・Increase the feed rate to improve chip evacuation. by chips ・Use L type chipbreaker. Breakage on central insert (center) ・Improper adjustment of center height ・Adjust the height of the insert. ・Insert too weak ・If the drill is being used on a lathe, try flipping the drill 180°. Insert breakage ・Use a strong edge chipbreaker H type. Breakage on outer insert ・High cutting load in cutting edge ・Decrease the feed rate to decrease cutting load. ・Use a strong edge chipbreaker H type. J94