Cutting tool holder with improved dampening effect
Cutting tool holders are disclosed that include vibration dampening elements. The vibration dampening elements may extend parallel to a longitudinal plane of the cutting tool holder. The vibration dampening elements allow the cutting tool holders to have a smaller width while still providing higher grooving depth.
1. A cutting tool holder comprising:
a holder body comprising:
opposing first and second side surfaces and a front surface extending therebetween;
opposing top and bottom end surfaces extending between the first and second side surfaces;
a central longitudinal bisecting plane located between the first and second side surfaces and intersecting the front surface;
a cutting portion located at a top end of the front surface of the holder body;
a first dampening aperture extending inward from the front surface of the holder body to a first dampening element abutment face, the first dampening aperture extending in a direction substantially parallel with the central longitudinal bisecting plane, the first dampening aperture including a first top inner surface and a first bottom inner surface spaced by a first aperture slot, the first dampening aperture further including a first engagement slot extending inward from the first dampening element abutment face;
a first vibration dampening element, comprising a first dampening pin and a first dampening sleeve: received within the first dampening aperture, the first vibration dampening element lying within and extending substantially parallel with the central longitudinal bisecting plane, the first dampening pin received within the first dampening sleeve for dampening vibrations of the cutting tool holder;
a second dampening aperture extending inward from the front surface of the holder body to a second dampening element abutment face, the second dampening aperture extending in a direction substantially parallel with the central longitudinal bisecting plane, the second dampening aperture including a second top inner surface and a second bottom inner surface spaced by a second aperture slot, the second dampening aperture further including a second engagement slot extending inward from the second dampening element abutment face;
a second vibration dampening element, comprising a second dampening pin and a second dampening sleeve, received within the second dampening aperture, the second vibration dampening element lying within and extending substantially parallel with the central longitudinal bisecting plane, the second dampening pin received within the second dampening sleeve for dampening vibrations of the cutting tool holder;
a stiffening aperture disposed between the first dampening aperture and the second dampening aperture, the stiffening aperture having an inner surface extending inward from the front surface of the holder body to a stiffening element abutment face, the stiffening aperture extending in a direction substantially parallel with the central longitudinal bisecting plane; and
a stiffening element, comprising a stiffening pin without a dampening sleeve, received within the stiffening aperture for increasing a stiffness of the cutting tool holder, the stiffening element lying within and extending substantially parallel with the central longitudinal bisecting plane.
2. The cutting tool holder of claim 1 , wherein a length of one of the first vibration dampening element and the second vibration dampening element is greater than a diameter of the first vibration dampening element.
3. The cutting tool holder of claim 2 , wherein the length of one of the first vibration dampening element and the second vibration dampening element is at least 500 percent greater than the diameter of the first vibration dampening element.
4. The cutting tool holder of claim 1 , wherein a diameter of one of the first vibration dampening element and the second vibration dampening element is at least 50 percent of a thickness of the holder body.
5. The cutting tool holder of claim 1 , wherein a diameter of one of the first vibration dampening element and the second vibration dampening element is at least 75 percent of a thickness of the holder body.
6. The cutting tool holder of claim 1 , wherein the first and second dampening pins of the first and second vibration dampening elements have a density greater than 5 g/cm 3 .
7. The cutting tool holder of claim 1 , wherein the first and second dampening sleeves of the first and second vibration dampening elements comprises a viscoelastic material.
8. The cutting tool holder of claim 1 , wherein the first dampening pin and the first dampening sleeve of the first vibration dampening element are slidably mounted to each other, and wherein the second dampening pin and the second dampening sleeve of the second vibration dampening element are slidably mounted to each other.
9. The cutting tool holder of claim 1 , wherein the first dampening pin and the first dampening sleeve of the first vibration dampening element are fixedly mounted to each other, and wherein the second dampening pin and the second dampening sleeve of the second vibration dampening element are fixedly mounted to each other.
10. The cutting tool holder of claim 1 , wherein the first and second vibration dampening elements are formed of substantially similar materials.