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HK

HK SERIES - THE GRAPHITE WORLD HAS SELECTED


Recommended Tool Shape

There are commercially available graphite-use end mills with long length of cut, long shank, and air hole to facilitate dust disposal


Recommended Tool Materials

Cutting-edge life tests have shown that sintered diamond is the best tool material followed by cemented carbide, high-speed steel, CBN, and ceramics. Cemented oarbide (K10 and K05) are used most frequently because the are available and easy to work with


Recommended Feed Speed

Rough milling 0.15-0.25mm/tooth

final milling 0.05-0.15mm/tooth


Recommended Cutting Direction

Adopt down-cuts for end milling since up-cuts may results in chipping along the working edge of the graphite


Recommended Cut Depth

A jet of air gushing from the end mill tip will facilitate the removal of machining dust, allowing cut depths five times as deep as the end mill's diameter.However, you may find that milling at a small cut depth under a high feed rate will be more efficient


PRECAUTIONS WHEN USING THE HK SERIES EDM'ing Surface Area Vs Surface Finish

The size of EDMing surface affects how the surface is finished. Note that greater electrode surface area results in rougher surface finish regardless of the grade graphite used

EDMing Surface Area (mm)VDIRa(µm)Rmax(µm)
50-9916-210.631.125-9
100-15021-231.12-1.409-11
151-20023-261.40-2.0011-14
201-30026-292.00-2.8014-21
301-40029-322.80-4.021-30
401-50032-354.00-5.6030-40
501-35-5.60-40-

If EDM is unstable, refer to the following table to adjust your  

EDMing conditions.


ProblemSolutions
EDMing speed is too slowIncrease IP, optimize the on time
Too much electrode wearIncrease IP, optimize the on time
Surface finish is too roughDecrease IP, optimize the on time
Unstable electric dischargeDecrease IP(especially at the start of EDM)
Optimize the on time
200µm sec or more for HK-0 to HK-75
100µm sec or more for HK-3
Gap ContaminationIncrease jump height, set higher jump frequency
Increase jump speed, check dialectric fluid

Surface Roughness Conversion Table (Rmax values are for reference only)

VDIRa(um)Ra(µ inch)Rmax(µm)
140.50204
150.5622-
160.63255
170.7028-
180.8032-
190.9036-
201.00408
211.12459
221.2650-
231.405611
241.606312
251.8072-
262.008014
272.208816
282.50100-
292.8011221
303.2012523
313.50140-
324.0016030
334.50180-
345.00200-
355.6022440
366.3025045

FOLLOW US

ADDRESS
Cheras Jaya Main Office
Lot 2, Jalan CJ 1/6C,
Kawasan Perusahaan Cheras Jaya,
43200 Selangor,
Malaysia.

CONTACTS
Email: info@phh.com.my
            : sales@phh.com.my

Telephone: +60 3 9075 6800 / 1700 81 6866
Fax: +60 3 9075 6866 / 1700 81 0386

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