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US-12617021-B2 - Y-axis parting adaptor for a cutting tool

US12617021B2US 12617021 B2US12617021 B2US 12617021B2US-12617021-B2

Abstract

A cutting tool assembly having a longitudinal axis establishing upward and downward directions, includes a Y-axis parting adaptor mounted onto a holder. The parting adaptor has an insert pocket including a base jaw configured to support a cutting insert. The holder has a holder head portion and a shank portion. The holder head portion has an adaptor pocket in which the parting adaptor is mounted. If the holder shank cross-sectional shape is square or rectangular the forwardmost cutting edge is directly above the forwardmost holder shank surface, and if the holder shank cross-sectional shape is round and a centrally extending holder shank axis extends to the forwardmost cutting edge.

Inventors

  • DOLEV BEST

Assignees

  • ISCAR, LTD.

Dates

Publication Date
20260505
Application Date
20221128

Claims (19)

  1. 1 . A tool assembly comprising: a parting adaptor; a cutting insert; and a holder; the parting adaptor comprising: a cutting portion; and an adaptor shank portion connected to the cutting portion; the cutting portion comprising: opposing first and second sides; and a peripheral edge connecting the first and second sides; the peripheral edge comprising: opposing front and rear sub-edges; and an upper sub-edge connecting the front and rear sub-edges; the first and second sides defining a first sideways direction directed from the first side towards the second side and a second sideways direction opposite to the first sideways direction; a forward direction is defined perpendicular to the first and second sideways directions and directed from the rear sub-edge towards the front sub-edge, and a rearward direction is defined opposite to the forward direction; an upward direction is defined perpendicular to both the first and second sideways directions and to the forward and rearward directions, and is directed from the adaptor shank portion towards the cutting portion; a downward direction is defined opposite to the upward direction; the cutting portion further comprises: an insert pocket formed at an intersection of the front and upper sub-edges; the insert pocket comprises: a base jaw comprising a forwardmost base jaw surface; a second jaw at least partially located upward of the base seat jaw; and a slot end connecting the base jaw and the second jaw; the adaptor shank portion comprising: an adaptor clamping arrangement; the cutting insert is secured to the insert pocket and comprises: an insert base surface abutting the base jaw; an upwardly facing rake surface located above the insert base surface; an insert second surface abutting the second jaw; a forwardmost clearance surface extending downwardly from the rake surface; and a forwardmost cutting edge formed at an intersection of the rake surface and the forwardmost clearance surface; the holder comprising: a holder head portion; and a holder shank portion connected to the holder head portion; the holder head portion comprising: an adaptor pocket to which the adaptor shank portion is secured; the holder shank portion comprising: a holder shank axis extending through the center of the holder shank and extending parallel with the upward and downward directions; a holder shank cross-sectional shape extending perpendicular to the holder shank axis and being either (a) square or rectangular or (b) round; a forwardmost holder shank surface; and an imaginary line extends in the upward direction from the forwardmost holder shank surface; wherein: the holder shank cross-sectional shape is square or rectangular and the forwardmost cutting edge is directly above the forwardmost holder shank surface; or the holder shank cross-sectional shape is round and the holder shank axis extends to the forwardmost cutting edge.
  2. 2 . The tool assembly according to claim 1 , wherein: the holder shank cross-sectional shape is square or rectangular and the forwardmost base jaw surface is within a tolerance distance DT of 2 mm from the imaginary line; or the holder shank cross-sectional shape is round and the forwardmost base jaw surface is within a tolerance distance DT of 2 mm from the holder shank axis.
  3. 3 . The tool assembly according to claim 2 , wherein the tolerance distance DT is smaller than 1 mm.
  4. 4 . The tool assembly according to claim 3 , wherein the tolerance distance DT is smaller than 0.5 mm.
  5. 5 . The tool assembly according to claim 1 , wherein the cutting portion further comprises: a blade portion thickness measured parallel to the first and second sideways at the insert pocket; and a blade region defined by having a thickness corresponding to the blade portion thickness, the blade region having: a maximum height HM measurable parallel to the upward and downward directions and from a lowest blade region point to a highest blade region point; a maximum width WM measurable parallel to the forward and rearward directions and from a forwardmost blade region point to a rearwardmost blade region point; wherein: the maximum width WM and the maximum height HM fulfill the condition: WM≥HM.
  6. 6 . The tool assembly according to claim 5 , fulfilling the condition: WM≥1.05 HM.
  7. 7 . The tool assembly according to claim 6 , fulfilling the condition: WM≥1.10 HM.
  8. 8 . The tool assembly according to claim 5 , fulfilling the condition: WM≤1.30 HM.
  9. 9 . The tool assembly according to claim 8 , fulfilling the condition: WM≥1.20 HM.
  10. 10 . The tool assembly according to claim 1 , further comprising: a reinforcement region having a reinforcement thickness measured parallel to the blade portion thickness and being larger than the blade portion thickness; wherein: the reinforcement region extends in the upward direction a reinforcement portion height HR from the lowest blade region point; and the reinforcement portion height HR and the maximum height HM fulfills the condition: HR>0.5 HM.
  11. 11 . The tool assembly according to claim 10 , fulfilling the condition: HR>0.65 HM.
  12. 12 . The tool assembly according to claim 11 , fulfilling the condition: HR>0.75 HM.
  13. 13 . The tool assembly according to claim 10 , fulfilling the condition: HR<HM.
  14. 14 . The tool assembly according to claim 13 , fulfilling the condition: HR<0.95 HM.
  15. 15 . The tool assembly according to claim 1 , wherein the insert pocket's second jaw is located in its entirety rearward of the base jaw.
  16. 16 . The tool assembly according to claim 15 , wherein the insert pocket's second jaw and base jaw extend adjacent to each other in a direction parallel to the upward and downward directions.
  17. 17 . The tool assembly according to claim 1 , only comprising a single insert pocket.
  18. 18 . The tool assembly according to claim 1 , wherein the overall shape of the insert adaptor is elongated when measured parallel to the upward and downward direction.
  19. 19 . A tool assembly comprising: a parting adaptor comprising: a cutting portion comprising: opposing first and second sides and a peripheral edge connecting the first and second sides, the peripheral edge comprising opposing front and rear sub-edges and an upper sub-edge connecting the front and rear sub-edges; wherein: the first and second sides define a first sideways direction directed from the first side towards the second side and a second sideways direction opposite to the first sideways direction; a forward direction is defined perpendicular to the first and second sideways directions and directed from the rear sub-edge towards the front sub-edge, and a rearward direction is defined opposite to the forward direction; an upward direction is defined perpendicular to both the first and second sideways directions and to the forward and rearward directions, and is directed from the adaptor shank portion towards the cutting portion; and a downward direction is defined opposite to the upward direction; and a single insert pocket formed at an intersection of the front and upper sub-edges, the single insert pocket comprising: a base jaw comprising a forwardmost base jaw surface; a second jaw at least partially located upward of the base seat jaw; and a slot end connecting the base jaw and the second jaw; and an adaptor shank portion connected to the cutting portion and comprising an adaptor clamping arrangement; a cutting insert secured to the single insert pocket and comprising: an insert base surface abutting the base jaw; an upwardly facing rake surface located above the insert base surface; an insert second surface abutting the second jaw; a forwardmost clearance surface extending downwardly from the rake surface; and a forwardmost cutting edge formed at an intersection of the rake surface and the forwardmost clearance surface; and a holder comprising: a holder head portion comprising an adaptor pocket to which the adaptor shank portion is secured; and a holder shank portion connected to the holder head portion, and comprising: a holder shank axis extending through the center of the holder shank and extending parallel with the upward and downward directions; a holder shank cross-sectional shape extending perpendicular to the holder shank axis; a forwardmost holder shank surface; and an imaginary line extending in the upward direction from the forwardmost holder shank surface; wherein: the holder shank cross-sectional shape is square or rectangular, the forwardmost cutting edge is directly above the forwardmost holder shank surface, and the forwardmost base jaw surface is within a tolerance distance DT of 2 mm from the imaginary line; or the holder shank cross-sectional shape is round, the holder shank axis extends to the forwardmost cutting edge and the forwardmost base jaw surface is within a tolerance distance DT of 2 mm from the holder shank axis.

Description

RELATED APPLICATIONS This is a Bypass Continuation of PCT/IL2021/050772, filed Jun. 24, 2021, and published as WO 2022/013852A1 on Jan. 20, 2022. Priority is claimed to U.S. Provisional Patent Application No. 63/050,936 filed Jul. 13, 2020. The contents of the aforementioned applications are incorporated by reference in their entirety. FIELD OF THE INVENTION The subject matter of the present invention relates to a parting adaptor configured to carry out parting and grooving operations along a Y-axis feed direction, as well as a holder configured for holding same. The present invention is also directed to a tool assembly comprising both the parting adaptor and holder and a method of machining with the tool assembly. BACKGROUND OF THE INVENTION The present application relates to parting components and machining operations using those components in a so-called Y-axis feed direction, rather than an X-axis direction. Such operations are disclosed in patent publications US 2020/0009757, directed to Y-axis blade portions, and US 2019/0358710 directed to a method of machining related to the same construction (hereinafter: “said patent publications”). Known product publications directed to blade portions corresponding to those shown in the above patent publications are disclosed in “Y-axis parting” by Sandvik Cormorant (said publication displaying an identifying footer: “C-1040:194 en-GB © AB Sandvik Coromant 2017”; hereinafter: “the Sandvik publication”) and “Parting Off in the Y-Axis” by Horn (said publication displaying an identifying footer: “INFO11.19DE, September 2019, Printed in Germany”; hereinafter: “the Horn publication”). It will be understood that these product publications are exemplary and are not meant to be an exhaustive list of all catalogue publications related to these products. Reverting to said patent publications, it is stated therein that there was a desire to reduce vibrations in traditional parting-off or deep grooving operations. Accordingly, an alternative blade portion is proposed in which, to summarize, the blade portion is elongated in basically the same direction as a main clearance surface of a cutting insert mounted to the blade portion. Stated succinctly in the Sandvik publication, the change is that the insert pocket is rotated 90 degrees. The present applicant has also further discussed such tools in US 2019/0240741. The present application is not directed to the variable overhang blades discussed in the earlier embodiments of said patent publications, but rather is directed to a so-called “parting adaptor” with a cutting portion and an adaptor shank portion which defines a single (non-variable) position of the adaptor in a holder similar to the type exemplified in the final embodiment of said patent publications (specifically FIGS. 16 to 18 in both publications) and as shown in the Horn publication. Similar to the above-mentioned publications, a parting adaptor of the present invention is configured to be held by said holder which in turn comprises a holder head portion and a holder shank portion (also called a “coupling portion” in said patent publications) configured to connect to a machine interface such as a turret or tool post. The holder shank portion can be of any known type such as a rectangular or square-shaped cross-sectional shank (as shown in the drawings of the present application) or can be basically cylindrical or basically conical as per the types described in ISO standard 26623-1 or ISO 12164-3 (also identified in the above-mentioned publications). It is an object of the present invention to provide a new and improved Y-axis parting adaptor, tool assembly including same and method of operation of such. SUMMARY OF THE INVENTION It has been observed that while the Y-axis parting tools described above can provide good vibration control, the set-up thereof is difficult. Whereas a standard X-axis feed parting blade or parting adaptor can be secured to a holder (which is secured to a machine interface) and a parting operation can be initiated without any need to offset the position of the tool assembly (i.e. to adjust the settings for a non-zero position of the cutting edge; called hereinafter “offset”), with known Y-axis tool assemblies an offset is required along both the X-axis and Y-axis. While machines capable of Y-axis feed machining are capable of providing both said offsets, it was conceived to reduce the setup complexity by providing a single-offset tool assembly to reduce the complexity for a user. While the setup is more complex than the X-axis feed tool assembly which does not require any offset, it can still provide the Y-axis stability (reduced vibration) advantage. In accordance with a first aspect of the present invention, there is provided a tool assembly comprising: a parting adaptor; a cutting insert secured to an insert pocket of the parting adaptor and comprising a forwardmost cutting edge; and a holder comprising a holder shank portion in turn com