Cutting tool and cutting insert therefor
View Patent ↗A cutting tool in which a cutting insert is resiliently retained. The cutting insert includes a locating portion and a cutting portion having a rake surface and a relief surface. The locating portion extends from the cutting portion away from the rake surface.
1. A cutting tool comprising:
an insert holder comprising an insert pocket and a clamping portion, the clamping portion comprising a clamping jaw resiliently connected to a base jaw and forming a single integral piece therewith, the base jaw having an abutment surface and the clamping jaw having a clamping surface facing opposite a lower portion of the abutment surface, the clamping jaw being further provided with an insert stop surface that is generally transverse to the clamping surface; and
a cutting insert resiliently retained in the insert pocket, the cutting insert comprising:
a cutting portion and a locating portion, the cutting portion comprising a cutting edge formed at the intersection of a rake surface and a relief surface;
an upper surface, a lower surface and a peripheral side surface therebetween, the peripheral side surface comprising:
opposing forward and rear surfaces and opposing side surfaces extending between the forward and rear surfaces; the relief surface being located in the forward surface and the rake surface being located in the upper surface; the locating portion extends downwardly from the cutting portion away from the upper surface; the locating portion comprising opposing forward and rear locating surfaces, the rear locating surface being located in the rear surface and the forward locating surface being located in the lower surface; and
a lower locating surface located in the lower surface and opposing the upper surface, and extending between the forward surface and the forward locating surface; and
wherein:
the abutment surface of the base jaw abuts the rear surface of the cutting insert;
the clamping surface of the clamping jaw abuts the forward locating surface of the cutting insert; and
the insert stop surface of the clamping jaw abuts the lower locating surface of the cutting insert.
2. The cutting tool according to claim 1 , wherein the abutment surface is convex.
3. The cutting tool according to claim 2 , wherein the abutment surface is convexly V-shaped.
4. The cutting tool according to claim 1 , wherein the abutment surface is divided by a base recess into an upper abutment surface and lower abutment surface.
5. The cutting tool according to claim 1 , wherein the insert stop surface is convex.
6. The cutting tool according to claim 5 , wherein the insert stop surface is convexly V-shaped.
7. The cutting tool according to claim 1 , wherein the base jaw is connected to the clamping jaw via a recess, and a through hole is located rearwardly to the base jaw for receiving a key.
8. The cutting tool according to claim 1 , wherein the cutting tool is a rotary slot cutting tool.
9. The cutting tool according to claim 1 , wherein the cutting tool is a grooving, parting off or turning tool and the insert holder is a holder blade.
10. A cutting tool comprising:
an insert holder comprising an insert pocket and a clamping portion, the clamping portion comprising a clamping jaw resiliently connected to a base jaw and forming a single integral piece therewith, the base jaw having an abutment surface and the clamping jaw having a clamping surface facing opposite a lower portion of the abutment surface, the clamping jaw being further provided with an insert stop surface that is generally transverse to the clamping surface; and
a cutting insert resiliently retained in the insert pocket, the cutting insert comprising:
a cutting portion and a locating portion, the cutting portion comprising a cutting edge formed at the intersection of a rake surface and a relief surface;
an upper surface, a lower surface and a peripheral side surface therebetween, the peripheral side surface comprising:
opposing forward and rear surfaces and opposing side surfaces extending between the forward and rear surfaces; the relief surface being located in the forward surface and the rake surface being located in the upper surface; the locating portion extends downwardly from the cutting portion away from the upper surface; the locating portion comprising opposing forward and rear locating surfaces, the rear locating surface being located in the rear surface and the forward locating surface being located in the lower surface; and
a lower locating surface located in the lower surface and opposing the upper surface, and extending between the forward surface and the forward locating surface; and
wherein:
the abutment surface of the base jaw abuts the rear surface of the cutting insert;
the clamping surface of the clamping jaw abuts the forward locating surface of the cutting insert; and
the insert stop surface of the clamping jaw abuts the lower locating surface of the cutting insert; and
wherein, in a side view:
the lower locating surface slopes downwardly and forwardly, from the forward locating surface towards the forward surface;
the insert stop surface slopes downwardly and forwardly, from proximate the clamping surface to a front face of the insert holder; and
the downwardly and forwardly sloping lower locating surface abuts the downwardly and forwardly sloping insert stop surface.