CUTTER ARBOR DAMPING DEVICE

A cutter arbor damping device includes a rod body, a damping mechanism, and a heat-resistance element. The rod body includes a connecting end having a connecting hole, a receiving room, and a blocking wall between the connecting hole and the receiving room. The connecting end is adapted for being heated to expand the connecting hole to receive a cutter inserted therein wherein the cutter is positioned when the connecting end is cooled down. The damping mechanism is received in the receiving room and includes a vibration absorption portion contacting an inner wall of the receiving room. The heat-resistance element is disposed between the damping mechanism and the inner wall of the receiving room and includes at least one longitudinal protrusion and at least one longitudinal gap which are located between the blocking wall and the damping mechanism.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a cutter arbor, especially to a cutter arbor of sintering.

Description of the Prior Art

It is widely applied that the connecting end clamps the cutter arbor by thermal expansion and contraction in the area of machine tool.

However, vibration during processing may have an adverse effect to damping. In addition, the cutter arbor has to be heated when displacing the cutter, so the cutter arbor or the components inside have to be made of metal having high heat resistance to prevent from damaging by heat.

SUMMARY OF THE INVENTION

The main object of the present invention is to provide a cutter arbor damping device which is heat-resistant to protect the components inside and is advantageous in damping. In addition, it's easy to manufacture and assemble.

To achieve the above and other objects, the cutter arbor damping device of the present invention includes a rod body, a damping mechanism, and a heat-resistance element. The rod body includes a connecting end having a connecting hole, a receiving room, and a blocking wall between the connecting hole and the receiving room. The connecting end is adapted for being heated to expand the connecting hole to receive a cutter inserted therein wherein the cutter is positioned when the connecting end is cooled down. The damping mechanism is received in the receiving room and includes a vibration absorption portion contacting an inner wall of the receiving room. The heat-resistance element is disposed between the damping mechanism and the inner wall of the receiving room and includes at least one longitudinal protrusion and at least one longitudinal gap which are located between the blocking wall and the damping mechanism.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer toFIG. 1toFIG. 4, the cutter arbor damping device1of the present invention includes a rod body10, a damping mechanism20, and a heat-resistance element30.

The rod body10includes a connecting end11having a connecting hole111, a receiving room12, and a blocking wall13between the connecting hole111and the receiving room12. The connecting end11is adapted for being heated to expand the connecting hole111to receive a cutter14inserted therein wherein the cutter14is positioned when the connecting end111is cooled down. The damping mechanism20is received in the receiving room12and includes a vibration absorption portion contacting an inner wall121of the receiving room12. The heat-resistance element30is disposed between the damping mechanism20and the inner wall of121the receiving room12and includes at least one longitudinal protrusion31and at least one longitudinal gap32which are located between the blocking wall13and the damping mechanism20. Thereby, the heat-resistance element30protects the components therein from damaging due to heat during installing or displacing the cutter14. In addition, the damping mechanism can reduce vibration during processing.

The damping mechanism20includes a damping piece21, at least one first damping element22radially arranged between the heat-resistance element30and the damping piece21, and at least one second damping element23longitudinally arranged between the heat-resistance element30and the damping piece21. In the present embodiment, eight said first damping elements22are radially disposed on the damping piece21, and one said second damping element23is disposed on each end along the longitudinal direction of the damping piece21. Thus, damping effect along both the radial direction and the longitudinal direction is provided. The first and the second damping elements22,23can be but not restricted to rubber rings

The damping mechanism20further includes a vibration adsorption element24located at a side of the damping piece21, and the second damping element23is located between the damping piece21and the vibration adsorption element24. In the preset embodiment, one said vibration adsorption element24is disposed on each end along the longitudinal direction of the damping piece21, and one said second damping element23is arranged between each vibration adsorption element24and the damping piece21so as to further improve the damping effect.

Each vibration adsorption element24has a flexibility smaller than that of the blocking wall13but larger than that of the first damping element22and that of the second damping element23. Thus, the vibration which is not adsorbed completely by the second damping element23can be adsorbed by the vibration adsorption element24, and the rigidity of the vibration adsorption element24is sufficient to bear the collision along the longitudinal direction. Preferably, the vibration adsorption element24is made of plastic which is easy to process and resists heat, such as Teflon or polyimide.

Preferably, the heat-resistance element30includes a plurality of said longitudinal protrusion31arranged spacedly. More specifically, the heat-resistance element30is a cylinder having an open end. The heat-resistance element30has a terminal wall33facing the blocking wall13and a peripheral wall34connecting to the terminal wall33. The longitudinal protrusion31is disposed on the terminal wall33. In the present embodiment, four said first damping elements22are radially disposed on each of two ends of the damping piece21. Due to the radial gaps36, heat cannot be transmitted to the eight first damping elements22so that the first damping elements22are protected.

The peripheral wall34has at least one radial protrusion35and at least one radial gap36which are located between the inner wall121of the receiving room12and the damping mechanism20. In the present embodiment, six radial protrusions35are separately formed on each end of the peripheral wall34. Thus, the radial protrusions35can radially position the heat-resistance element30and reduce the contact area between the heat-resistance element30and the inner wall121.

Preferably, the damping mechanism20includes a damping piece21and a plurality of first damping elements22located at two ends of the damping piece21, and the first damping elements22radially correspond to the radial gap36at least partially. In the present embodiment, each end of the damping piece21has four said first damping elements22radially disposed thereon. Thus, heat is prevented from being transmitted directly to the eight first damping elements22due to the radial gaps36so as to protect the first damping elements22.

The first damping elements22are protruded above the peripheral face211of the damping piece21. One said radial gap36is located between the peripheral wall34and the peripheral face211, and an other one radial gap36is located between the peripheral wall34and the inner wall121of the receiving room12. Thereby, the heat-resistance element30prevents from the heat transmission between the outside of the rod body10and the damping mechanism20when displacing the cutter14so that the damping mechanism20may nor damage due to heat. In addition, the damping mechanism can be made of various material.

The rod body10includes a first section15, a second section16, and a threading member40. The second section16is hollow and has said the connecting end11and said blocking wall13. The damping mechanism20is received in the second section16. The threading member40is adjacent to the damping mechanism20. The threading mechanism40includes at least one threaded element threadedly disposed on the second section16, and a bolt42received in the first section15and screwed with the threaded element. The receiving room12is enclosed by the first section15and the second section16. More specifically, the second section16is formed with a threaded hole41therein. The threading member40includes a first nut43and a second nut44which are screwed into the threaded hole41. The first nut43is adjacent to the damping mechanism20. The bolt42is screwed with the second nut44. The first nut43is axially formed with a polygonal hole431for a driving tool to engage. The second nut44is axially formed with an internal threaded hole45screwed with the bolt42. The first section15has an opening151. The second section16has an insertion section161inserted into the opening151and a radial flange162axially abutting against the first section15. In the present embodiment, the first nut43is formed with a hexagon hole, so the position of the first nut43can be adjusted by a hexagon wrench. Thereby, the axial position of the damping mechanism20can be adjusted. In addition, the second nut44abuts against the second nut43to prevent the first nut43from falling. The bolt42abuts against not only the second nut44but also the first section15so as to pull the second section16toward the first section15. The radial flange162can restrict the relative position of the first section15and the second section16. In other possible embodiments, the threading member can include only the second nut44. The second nut44is first screwed, and the second section16is pulled by the bolt42.

The heat-resistance element30can be made of porous cermet oxide. Preferably, the heat-resistance element30is made of cermet oxide having high temperature stability, high strength, and low thermal-conductivity, such as zirconium oxide, so as to prevent from damaging due to heat.

In another embodiment shown inFIG. 5, a threaded pin50is inserted through the heat-resistance element30. The threaded pin50has threaded sections51at two ends thereof. The two vibration adsorption elements24are screwed with the two threaded sections51respectively. Thereby, the components are positioned precisely, and the relative position of the two vibration adsorption elements24can be adjusted. Preferably, a terminal end of each of the threaded section51is flush with a terminal end of its corresponding vibration adsorption element24or is received in the corresponding vibration adsorption element24. Thus, the hard threaded pin50is prevented from contacting the heat-resistance element30directly to reduce damping effect.

In conclusion, the heat-resistance element of the present invention can protect the components inside the rod body from damaging by heat, and the damping mechanism inside the rod body provides excellent damping effect.