ATH Coating Cast iron Carbon steel, Alloy steel Stainless steel Mold making Pre-hardened steel Parts processing Carbide Drill for SR machining WHSR-ATH Suppression of stress corrosion cracking in the cooling hole of the mold Tip R shape Lineup of sizes in high demand in the market φ3～φ 12 Hole cross section after drilling Hole cross section after SR machining

Technology corner edge Stress corrosion cracking may occur around the corner of the cooling hole or scratches on the hole wall surface in die casting or plastics molds. By using a carbide drill for SR machining, it is possible to round the hole bottom and to reduce scratches on the hole wall, thereby suppressing stress corrosion cracking and extending the life of the molds. Rz 13μm Hole cross section after drilling Coolant hole Molding portion SR machining (Sphere Radius) Figure: Image of cooling holes of mold Rz 2μm Hole cross section after SR machining Features Employs high rigidity groove...

: Stocked items.

Cutting method 1 When finishing only the hole bottom 1 Machine a pilot hole using 03 to 05WHNSB (or NSBH). ※Recommended Pilot hole diameter is φDc (+0.03~+0.1). 　Gurge might be decreased if the diameter is same as φDc. 2 Machine the long hole using WHNSB (or NSBH). Specified hole depth -0.42×Dc 3 Machine the hole bottom using WHSR. (Drilling dia.) Inching dwell Specified hole depth Feed rate at hole middle section Inching return amount Inching amount + Inching return amount Inching feed for hole bottom R section Inching amount + Inching return amount：2000mm/min Feed for hole middle section Insertion...

Cutting conditions When finishing only the hole bottom

Tool selection ^Cautions •As a guide of the maximum hole depth, please set with groove length minus 2xDc. •Even with the same tool diameter, shank diameter may be different for each tool. •The size of the collet to use also varies, so please check carefully. (The shank diameter of the corresponding tool is indicated by red number.) Long hole Pilot hole [ ~45HRC^ When finishing only the hole bottom Tool dia. (mm) Details are mentioned on Page 3 : Stocked Items. □ : Stocked by specified distributor. Contact with our sales department.

Long hole Tool dia. (mm)

Tool selection ^Cautions •As a guide of the maximum hole depth, please set with groove length minus 2xDc. •Even with the same tool diameter, shank diameter may be different for each tool. •The size of the collet to use also varies, so please check carefully. (The shank diameter of the corresponding tool is indicated by red number.) When finishing the hole walls and hole bottom Tool dia. (mm) : Stocked Items. □ : Stocked by specified distributor. Contact with our sales department. ' y Details are mentioned on Page

When finishing the hole walls and hole bottom Tool dia. (mm)

Trouble shooting insufficient surface

Field data ● DAC-P (45HRC) drilling example Cutting condition Tool：20WHSR0850-ATH（φ8.5×R201×L 256×φ10） 　Work material：DAC-P （45HRC） Machine：Horizontal MC （HSK-A63） vc=70m/min　Water base coolant　Internal coolant 2.2MPa Hole bottom R section Inching length：0.085mm Inching return amount：0.2mm Inching return rate：100mm/min Hole bottom R section Hole middle section Entrance section Pilot hole section Hole bottom condition after machining 100 holes Flank wear Hole wall surface roughness Rz: 1.5 µm Possible to machine 100 holes and more ● KDA1S(A) drilling example Cutting condition Hole bottom R section...

Culling condition Tool : 20WHSR0850-ATH (08.5xR2O1 *L256x010) Work material : DAC-P (A) Machine : Horizontal MC (HSK-A63) Water base coolant internal coolant 2.2MPa The diagrams and table data are examples of test results, and are not guaranteed values. A Attentions on Safety1. Cautions regarding handling (1) When removing the tool from its case (packaging), be careful that the tool does not pop out or is dropped. Be particularly careful regarding contact with the tool flutes. (2) When handling tools with sharp cutting flutes, be careful not to touch the cutting flutes directly with your bare...