Long shaft bit having vibration preventing structure

• US 8,978,527 B2
• Filed: 11/14/2011
• Issued: 03/17/2015
• Est. Priority Date: 12/28/2010
• Status: Active Grant

• Current Assignee: Korea Basic Science Institute
• Original Assignee: Korea Basic Science Institute
• Inventors: Yang, Sun Choel, Chang, Ki Soo, Kim, Myeong Sang, Kim, Geon Hee
• Primary Examiner(s): Singh, Sunil K
• Assistant Examiner(s): Addisu, Sara
• Application Number:
  US13/993,237
• Publication Number:
  US 20130259584A1
• Time in Patent Office: 1,219 Days
• Field of Search: 821/63, 821/58, 829/04, 821/73, 408/143, 407/11, 409/141
• US Class Current: 82/163
• CPC Class Codes: B23B 2250/12 Cooling and lubrication
• CPC Class Codes: B23B 2250/16 Damping of vibrations
• CPC Class Codes: B23B 27/002 with vibration damping means
• CPC Class Codes: B23B 27/007 for internal turning boring bars B23B29/02, boring heads B23B29/03; milling cutters B23C5/00; reamers B23D77/00
• CPC Class Codes: B23B 27/10 Cutting tools with special provision for cooling drills with lubricating or cooling equipment B23B51/06; features relating to lubricating or cooling of milling cutters B23C5/28; arrangements or devices for cooling or lubricating tools or work B23Q11/10
• CPC Class Codes: B23Q 11/0032 Arrangements for preventing or isolating vibrations in parts of the machine B23B29/022, B23D47/005 take precedence; means for damping or suppressing vibrations, in general F16F
• CPC Class Codes: Y10S 82/904 Vibrating method or tool
• CPC Class Codes: Y10T 407/14 with means to apply fluid to cutting tool
• CPC Class Codes: Y10T 407/22 including holder having seat for inserted tool
• CPC Class Codes: Y10T 408/76 Tool-carrier with vibration-damping means
• CPC Class Codes: Y10T 82/2595 with noise or vibration dampener

Abstract

The present invention relates to a bit for processing the inside diameter of a work material, the bit having on the outer surface of a shank a vibration preventing structure comprising a vibration absorption body made of a silicone material, and a hollow wire rod, thereby absorbing the vibration generated from a machine tool, preventing resonance generated between the work material and a tool, and thus, enabling the implementation of a slickenside from ultra-precision machining.

Claims

1. A long shaft bit with a vibration suppressing structure, comprising:

a tip fixing part disposed at a front end of the long shaft bit and coupled to a cutting tip;

a shank which is connected to the tip fixing part; and

a bit fixing part which is connected to the shank, the bit fixing part for fixing the bit,

the vibration suppressing structure being disposed on an outer surface of the shank and comprising a vibration absorbing body disposed on the outer surface of the shank in a multi-layer and a hollow wire rod spirally coiled in a second absorption layer, a third absorption layer, and an outermost layer of the vibration absorbing body,

whereby the vibration suppressing structure absorbs vibration and prevents resonance during cutting process for a cutting subject.

2. The long shaft bit of claim 1, wherein the vibration absorbing body comprises:

a first absorption layer disposed on the outer surface of the shank;

a second absorption layer disposed on an outer surface of the first absorption layer;

a third absorption layer disposed on an outer surface of the second absorption layer; and

an outermost layer disposed on an outer surface of the third absorption layer.

3. The long shaft bit of claim 2, wherein the hollow wire rod is spirally coiled inside the second absorption layer, the third absorption layer, and the outermost layer, respectively.

4. The long shaft bit of claim 2, wherein the first absorption layer, the second absorption layer, the third absorption layer, and the outermost layer are made of silicone.

5. The long shaft bit of claim 3, wherein the hollow wire rod is made of copper, enabling easier bending process.

6. The long shaft bit of claim 3, further comprising a cutting oil and compressed air supply pipe being inserted inside the first absorption layer, the cutting oil and compressed air supply pipe for supplying cutting oil and compressed air to the tip fixing part to which the cutting tip is coupled.