Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
  • B24B1/04—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes subjecting the grinding or polishing tools, the abrading or polishing medium or work to vibration, e.g. grinding with ultrasonic frequency
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B39/00—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B35/00—Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency

Definitions

• the lapping process includes two methods, one being a wet lapping method and the other being a dry lapping method.
• the wet lapping method calls for mixture of lap material and fluid to be infused into a workpiece for machining.
• the dry lapping method needs the lap tool to be buried in the lap material, which is then wiped off with cloth. Then, lapping is carried out in the dry state.
• a high precision of a surface machining process is required for finishing metallic surfaces such as the inner surface of hydraulic or pneumatic pressure cylinder used for automobiles, industrial heavy equipment, various automated machines and other general machinery, the outer surface of various metal shafts, the plane or slant surfaces of machines, plane and the free curved surfaces of press mold, forging mold, injection mold and die casting mold.
• the ultrasonic oscillator is fixed at a case, and the pressing means is made with pressure controlling means for controlling the pressing force to be applied to the case.
• the case is made to fluctuate inside guiding means according to the pressure of the pressing means.
• FIG. 4 illustrates a state of finishing an inner surface of a cylinder with a micro-burnishing apparatus of the present invention
• the guiding means 54 is to be moved by driving (transfer) means and control means.
• the driving (transfer) means is constructed with a variety of means including a ball screw motor.
• the ball 55 is fixed at the fitting part 56.
• the ball 55 is usually made of steel for finishing soft material, but super-light alloy for hard material.
• the burnishing head 40 can be made of only chrome-molybdenum steel (for instance, SCM4), high alloy steel (for instance, SKD11).
• the ball 55 can be made of tool steel (SKD, SKH, SKS, etc.), super light alloy steel, ceramic tool, CBN, artificial diamond, etc.
• the ball 55 can be selectively made of various material according to finishing material and conditions.
• the fitting part 56 of the burnishing head 40 is inserted into the holding means 42.
• the transfer speed determines a transformation rate of the finishing surface.
• the quality of the finished surface basically depends on static weight applied to the workpiece and amplitude of ultrasonic vibration. As a result, the selection of adequate transfer speed and rotations significantly affect the control of the surface hardening process.
• machining process is performed by the micro- burnishing apparatus of the present invention for three minutes under the following conditions: frequency of 20 kHz, transfer speed of 0.16 mm/rev, rotations of 450 rev/min, transmission of pressing force of 12 kg, and the result of the surface finishing process is included in Table 1.
• the ball vibrates in contact with a workpiece and smoothes its surface, thereby improving the surface hardness at a lower degree of surface roughness with a reduction in the surface finishing time, and, also, the smoothness of the surface of molds when the micro-burnishing apparatus is attached to a vertical or horizontal machining center or a robot for other uses.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=19677798

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (43)

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• 2000
  • 2000-07-13 KR KR1020000040177A patent/KR100316003B1/ko not_active Expired - Lifetime
  • 2000-08-23 CA CA002384002A patent/CA2384002A1/en not_active Abandoned
  • 2000-08-23 WO PCT/KR2000/000947 patent/WO2002006007A1/en not_active Ceased
  • 2000-08-23 EP EP00955133A patent/EP1303380A4/de not_active Withdrawn
  • 2000-08-23 AU AU2000267371A patent/AU2000267371A1/en not_active Abandoned
  • 2000-08-23 JP JP2002511930A patent/JP2004504166A/ja active Pending
  • 2000-08-23 CN CN00812621A patent/CN1373698A/zh active Pending

Non-Patent Citations (3)

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