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(Machining Process)

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��76?)&9E ��76?)&9E

(Cutting Speed)

Vc = πDn /1000 [m/min]

Vc = �� ����� ������������ ��� [m/min]D = ��� !��"���#$��%&'�( )(*+,�(�� [mm]n = �-����). )(����. [1/min]

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����"��+��

1 $ 4�68�� !�G�#$%*� ;)* ����&'(�)*"()+��

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2) &76E��6%�=�"+!�� 68&76E��6%�=�"�� �6�* (Low/medium alloy steels)

(Mo), (Cr) (W) (Cemented carbides) �)�� ?� �)�+X�� �"&")H Y6Y

3) &76E�)���* (High Speed Steels) 7()$(�)9?)'() HSS&76E� 5'&"�9" � �&��9" ��*�&+ 5"64��4 �" 68'�H�)

��! T "���*�&+ &�] �? =�"76��$ 4� M "�5"64��4 �"&�] �? =�"76��

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' �"&7 �9 ��*

&�� M 3 class 2 68 M4 &�] &76E�)���*���"�'�H�) 68 � �&��9"��* #$%&�]

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��$��;E*"�6%

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"��B

&�� M1,M2,M7 ��"#$

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5678=* (Powder Metallurgy)

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"��;@_ ��+%� �� +?)���@�7)��"��

5'�)6�H76?)=�" (Cast Cobalt Alloys)

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&76E�)���*

5'�)6�H76?)=�"

:�&" +H'�HG��H

:�&" +H'�G��H (WC)

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TiC 3600-4000 HV

TiN

TiCN 2800-3000 HV

2000-3000 HV

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&:�"4� (Ceramics)

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&:�"4�;� #$%# *� ��+�����=4 ���68&)�9� 68#$%' �"&E # ��+����* #$%+��

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+��& (̂) &$? 568=�"���=?� ��+�;@_ ��"� :@�*&� ;)*&:�"4�d8"�' �"

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(Cubic Boron Nitride)

&<$d8#$%&�] &'(�)*"()+�� ����d!�< � )5678 &$? )6�"4& �9"=�" �)*�*

=�" �% &:�"4� ��*�&+ '�HG��H 74 ') ��+

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��76?)&9E

�� ��' �"7 (�7 ? 9�� ��'()&: +4�5+X�

$ 4�;)* !_�9�76?)&9E

r Soluble Oils #$%=�"��� !_ � 68d8)9�?# �A�<;)*��686�9 "�'�3�"��+4#

��76?)&9E ����� #7%��76?)6(� 68�s)*�� ��&�4�� 4"

r Cutting Oils &�] !_�"� +�����&+4"�����"�'�3�"��+4# ��+��& (̂) &;%�G� 68

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r Chemical Cutting Oils &�] !_�9�76?)&9E ���&�4�d������*&'�87H��*&'"� )9�?

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�? =�"��*&'"� 68��*$ 4�"��? =�";)*�� Extreme-Pressure (EP) :@�*d8

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Calcium (Ca)

•$? 9#7%��&<4�"'�3A�<�8d�9+� G�%��•$? 9686�9�4�*����

Magnesium (Mg)

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Zinc (Zn)

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Phosphorus (P)

•&<4�"' �"��"�C# ����*����* (EP)•+%� �� ���@�7)686���&��9��� •6���d��+� ;)*&76E� (Metal Deactivator) �s)*�� ��76)"+4�# A� 8���A�8 _!�7 ����*

Sulphur (S)

'�3�"��+4��&<4�"'�3A�<

�8� �������'�9&p>

���6@* (Turning)

$4_ *� �6@*; �� D = 40 "". 68 n = 250 )�/ ��� d8G�%' �"&E +�����&"+/ ���

$4_ *� �6@*; �� D = 4.0 4_ 68 n = 250 )�/ ��� d8G�%' �"&E +�����j�++?) ���

Vc = πDn /1000

104.7 56�/����

31.4 ���/����

Vc = ( n D π )/12 ft/min