เอกสารการประชุมวิชาการและเสนอผลงานวิจัย มหาวิทยาลัยทักษิณ ครั้งที่ 19 2552 - page 131

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2.0 wt% Mo, 0.30 wt% V ¨³nªœŸ¤š¸É Á®¨º°Áž} œ Fe 宦´ Á‡¦ºÉ°Š EDM š¸Éčo˜´—·Ê œŠµœš—°Äœ„µ¦š—¨°Šœ¸Ê
‡º° Sodick AQ35L Ž¹ÉŠÁž}œ ram EDM ¨³Äo kerosene Áž}œ °ŠÁ®¨ªÅ—°·Á¨È„š¦·„ ץčo°·Á¨È„Ú¦—š¸É¤¸¨´„¬–³Áž}œ
š¦Š„¦³°„šÎ µ¤µ‹µ„š°ŠÂ—ŠŸ¤ (copper alloy ASTM C18150) š¸ÉŸ¨·˜Ã—¥ James Coppell Lee ž¦³Áš«
°°Á˜¦Á¨¸ ¥ ×¥°·Á¨È„Ú¦—¤¸ nªœŸ¤—´Šœ¸Ê 0.70-0.91 wt% Cr, 0.031-0.041 wt% Zr ¨³nªœŸ¤š¸É Á®¨º°Áž} œ Cu
®¨´Š‹µ„„µ¦˜´——oª¥ EDM ·Ê œŠµœš—°‹³™¼„Áži µÄ®o®oŠ„n°œš¸É ‹³œÎµÅž´ÉŠ®µœÊ宜´„š¸É ¼Á¸¥ÅžÁœºÉ°Š‹µ„„µ¦˜´—
Á¡ºÉ°‡Î µœª–®µ°´˜¦µ„µ¦˜´—ÁœºÊ°·ÊœŠµœ ×¥Á‡¦ºÉ °Š´ÉŠš¸Éčo´ÉŠ®µœÊ宜´ „·ÊœŠµœÄœ„µ¦š—¨°Šœ¸Ê ‡º° Oertling, UK ¤¸
‡ªµ¤¨³Á°¸¥— 0.01 g ®¨´Š‹µ„œ´ÊœœÎµ·ÊœŠµœš—°Åžª´—‡ªµ¤®¥µŸ· ªš¸ÉÁ„·—‹µ„„µ¦˜´— Á‡¦ºÉ °Š¤º°š¸Éčoª´—‡ªµ¤
®¥µŸ· ª °Š¦°¥˜´— ‡º° Tokyo Seimitsu ¦»nœ Surfcom 480A ץčo cut-off length ¨³ scan length Ášnµ„´ 2.50
¨³ 12.50 mm ˜µ¤¨Î µ—´ ×¥‡nµ‡ªµ¤®¥µŸ·ªš¸É «¹„¬µÄœ„µ¦š—¨°Šœ¸Ê ‡º° ‡nµ‡ªµ¤®¥µŸ·ªÁŒ¨¸É ¥Á·Š˜´ ªÁ¨
(arithmetic mean roughness: Ra)
˜´ªÂž¦„µ¦˜´—š¸ÉšÎµ„µ¦«¹„¬µÄœš‡ªµ¤œ¸Ê ŗo „n ¦³¥³Áª¨µÄœ„µ¦žµ¦r‡ °Š°·Á¨È„Ú¦—„´·ÊœŠµœ (ON)
„¦³Â¼ Š»—Äœ„µ¦žµ¦r ‡ °Š°·Á¨È„Ú¦—„´·ÊœŠµœ (IP) ¨³‡ªµ¤Á¦Èª¦°Äœ„µ¦®¤»œ °Š°·Á¨È „Ú¦— (SP) ×¥
„n°œ„µ¦«¹„¬µÄœ‡¦´ÊŠœ¸Ê˜´ªÂž¦„µ¦˜´—š¸Éčo˜´—Á®¨È„„¨oµÁ‡¦ºÉ°Š¤º° DC 53 ‡º° ON = 300 Psec, IP = 40 A ¨³ SP = 10
rpm Ž¹ÉŠÄœ„µ¦«¹ „¬µœ¸Êŗočo˜´ªÂž¦„µ¦˜´—Á®¨nµœ¸ÊÁž}œ‡n µ„¨µŠÄœ„µ¦°°„„µ¦š—¨°Š ץčo®¨´ „„µ¦¡ºÊœŸ· ª
Ÿ¨˜°œ°Š (response surface)  central composite design (CCD) n ª¥Äœ„µ¦°°„„µ¦š—¨°Š Ž¹ÉŠ¦³—´
°Š˜´ªÂž¦„µ¦˜´ —š¸ÉčoĜ„µ¦š—¨°Šœ¸Êŗo—ŠÅªoĜ˜µ¦µŠš¸É 1
˜µ¦µŠš¸É 1 ˜´ªÂž¦„µ¦˜´—¨³¦³—´š¸ÉčoĜ„µ¦š—¨°Š
˜´ªÂž¦„µ¦˜´ — ¦³—´ 
1 2 3 4 5
ON (Psec) 250 271.13 300 328.87 350
IP (A) 20 28.45 40 51.55 60
SP (rpm) 5 7.11 10 12.89 15
Ĝ„µ¦°°„„µ¦š—¨°ŠÃ—¥Äoª·›¸ „µ¦¡ºÊœŸ· ªŸ¨˜°œ°ŠÂ CCD œ´Êœµ¤µ¦™ÂnŠ„µ¦š—¨°Š
°°„Áž}œ 3 n ªœ ‡º° (1) „µ¦š—¨°ŠÂ 2 k Á¤ºÉ° k ‡º° ‹Îµœªœ °Š˜´ªÂž¦„µ¦˜´ — —´Šœ´ÊœÁŠºÉ°œÅ Ĝ„µ¦š—¨°Š
š´Ê Š®¤—Äœnªœœ¸Ê‹¹Š¤¸ 23 ®¦º° 8 ÁŠºÉ°œÅ (2) „µ¦š—¨°Šš¸É‹»—«¼ œ¥r„¨µŠ 宦´ Äœ„µ¦š—¨°Šœ¸Ê¤¸ 1 ÁŠºÉ°œÅ ¨³ (3)
„µ¦š—¨°Šš¸É ‹»—ž¨µ¥ °ŠÂ„œ 宦´„µ¦š—¨°Šš¸É¤¸‡nµ k = 3 ‹³˜o°Š¤¸ 6 ÁŠºÉ°œÅ —´Šœ´Ê œÄœ„µ¦š—¨°Šœ¸Ê‹¹Š¤¸
‹Î µœªœ„µ¦š—¨°Šš´ÊŠ®¤— 15 „µ¦š—¨°Š ¦¼žš¸É 1 —Š„µ¦°°„„µ¦š—¨°Šœ®¨´ „„µ¦ °Š¡ºÊœŸ· ª
Ÿ¨˜°œ°ŠÂ CCD š¸ÉœÎµ¤µÄoĜ„µ¦š—¨°Šœ¸Ê