CN-115835926-B - Tool assembly configured for Swiss type machining

Abstract

A grooving or parting tool assembly for swiss machining includes a holder. The retainer includes a resilient normally closed retainer clip. In a preferred embodiment, the holder clamp biases a tool holding the cutting insert against a pocket side abutment surface of the holder pocket.

Inventors

• G. Hector
• D. Ben Harush

Assignees

• 伊斯卡有限公司

Dates

Publication Date

20260508

Application Date

20210615

Priority Date

20200708

Claims (20)

1. 1. A retainer includes opposing retainer first and second sides defining a first side direction from the retainer second side toward the retainer first side and a second side direction opposite the first side direction, opposing retainer front and rear ends defining a forward direction from the retainer rear end toward the retainer front end and a rearward direction opposite the forward direction side, opposing retainer top and bottom sides defining an upward direction from the retainer bottom toward the retainer top and a downward direction opposite the upward direction, retainer pockets located at an intersection of the retainer first side, the retainer front and the retainer top, and retainer clips located at the retainer top, the retainer pockets including pocket side abutment surfaces extending along the retainer first side and facing the first side direction, bottom abutment surfaces located below the pocket side abutment surfaces and facing the upward direction, and rear abutment surfaces defining an upward direction from the retainer bottom toward the retainer top side and a downward direction opposite the upward direction, retainer pockets located at an intersection of the retainer first side, the retainer front and the retainer top, and retainer clips located at the retainer top, the retainer pockets including pocket side abutment surfaces extending along the retainer front and facing the first side direction, a pocket side abutment surface located below the pocket side abutment surfaces and facing the upward direction, a resilient pocket side abutment surface located at the retainer top abutment surface, a resilient pocket abutment surface located at the hinge portion, and a resilient pocket portion located at the hinge portion, the abutment surface located at the hinge portion, and the hinge portion located at the abutment portion, and the abutment surface is formed from the abutment surface facing the resilient surface The retainer clip is a laterally directed retainer clip.
2. 2. The retainer of claim 1, wherein the pocket bottom abutment surface also faces the second side direction and is thus inclined inwardly to face the upward direction and the second side direction, and the clip top abutment surface also faces the second side direction and is thus inclined inwardly to face the downward direction and the second side direction.
3. 3. The retainer of claim 1, further comprising a retainer guide hole that flares toward the pocket side abutment surface.
4. 4. A holder according to claim 3, wherein the holder guide hole includes a constricted portion.
5. 5. The retainer of claim 4, wherein the retainer guide bore is hourglass shaped.
6. 6. The retainer of claim 1, wherein the retainer comprises an elongated shank portion and a head portion extending forward of the shank portion, the retainer pocket being at least partially formed on the head portion at the retainer first side.
7. 7. The retainer of claim 6, wherein the retainer pocket extends behind the head portion.
8. 8. The holder of claim 6, wherein in a front view of the holder, the handle portion has a profile and a sole portion of the holder that extends beyond the profile of the handle portion extends in the upward direction.
9. 9. A tool assembly comprising the holder of any one of claims 1 to 8 and a knife comprising opposing knife first and second sides, opposing knife front and rear edges, opposing knife top and bottom edges, first and second knife seats each comprising a base seat jaw and a second seat jaw opposite the base seat jaw and configured for resilient clamping, a maximum knife height BH measured from the knife bottom edge to the knife top edge, a maximum knife length BL measured perpendicular to the maximum knife height BH and from the knife front edge to the knife rear edge, and a maximum knife thickness BT measured perpendicular to the maximum knife height BH and from the knife first side to the knife second side, wherein the maximum knife thickness BT is less than the maximum knife height BH, the maximum knife length BL is measured from the knife bottom edge to the knife top edge, the maximum knife length BL is 45mm, and the first knife seat is splayed to the first knife rear edge.
10. 10. The tool assembly of claim 9, wherein the cutter further comprises a push hole opening to the cutter first side and the cutter second side, and the push hole comprises a hole inner surface extending perpendicular to the cutter first side and the cutter second side.
11. 11. The tool assembly of claim 10, wherein the push hole is symmetrically located between the first cutter seat and the second cutter seat.
12. 12. The tool assembly of claim 10, wherein the push hole is positioned closer to the cutter lower edge than the first cutter seat and the second cutter seat.
13. 13. The tool assembly of claim 9, wherein the cutter further comprises a maximum seat length SL parallel to the maximum cutter length BL and measured from a forwardmost point of the first cutter seat adjacent the cutter leading edge to a rearwardmost point of the first cutter seat distal the cutter leading edge, and wherein the maximum cutter length BL and the maximum seat length SL define a length-to-seat ratio BL/SL of BL/SL <5.
14. 14. The tool assembly of claim 9 wherein the cutter further comprises a cutter seat-to-seat length STS that is parallel to the maximum cutter length BL and measured parallel to the maximum cutter length BL between the distal-most portions of the first cutter seat and the second cutter seat, wherein the maximum cutter seat-to-seat length STS and the maximum cutter height BH define a seat-to-seat-height ratio STS/BH: STS/BH >1.2.
15. 15. The tool assembly of claim 9 wherein the maximum bit length BL and the maximum bit height BH define a length-to-height ratio BL/BH >1.2 that satisfies the condition.
16. 16. The tool assembly of claim 9, wherein both the base seat jaw and the second seat jaw are formed with tapered surfaces, the cutter comprises only the first cutter seat and the second cutter seat, and wherein two cutter seats are adjacent the cutter top edge.
17. 17. The tool assembly of claim 9, wherein the cutter bottom edge extends forward of the first cutter seat.
18. 18. The tool assembly of claim 9, wherein the cutter top edge includes a top edge tapered portion that tapers from both the first side surface and the second side surface.
19. 19. The tool assembly of claim 18 wherein the tool top edge has a tool maximum top edge length MTL, the top edge tapered portion edge has a tool tapered top edge length TTL, and the tool maximum top edge length MTL and the tool tapered top edge length TTL define a top edge ratio MTL/TTL that satisfies the condition MTL/TTL >2.
20. 20. The tool assembly of claim 18, wherein the top edge tapered portion is located between two relief portions.

Description

Tool assembly configured for Swiss type machining Technical Field The subject of the present invention relates to a tool assembly configured for so-called swiss-type machining, more particularly grooving or parting operations. Background The names "Swiss" or "Swiss" are sometimes omitted hereinafter for brevity. It will be appreciated that the present design is first and foremost designed to operate within the unique limitations of a swiss CNC machine, but that advantageous design features may also benefit even non-swiss operation. Swiss machining tool assemblies and components thereof are particularly designed for use in so-called swiss CNC machines (lathes) which differ from other typical CNC machines (lathes) in that the swiss tool assemblies are mounted with tools close to each other in a "group" and removal or mounting of cutting blades (or "blades") is difficult due to space constraints. The unique features of swiss machining such as the location of the cutting edge (which is substantially aligned with the top corner of the holder shank in the front view of the holder) are further detailed, inter alia, in applicant's previous patent publications USP9,901,986 and USP10,583,495, the contents of which are incorporated by reference in their entirety. Briefly, for the present application, it is also noted that in addition to the chip shaper arrangements uniquely claimed in USP9,901,986, a common swiss-type cutting insert (106) is shown having a threaded bore (112) extending through a side surface thereof. This design allows access for removal and replacement of blades in a tightly packed swiss tool assembly. As exemplified in applicant's publication USP10,471,517, other common blade designs include similar blades, except that there are two such threaded bores. In the disclosure, a tool assembly is shown that allows for removal and installation of a blade from either of two opposing sides. In USP10,583,495, a unique tool assembly is shown that provides a blade without the threaded hole, but a different solution for overcoming the above mentioned space limitations that create difficulties in securing and removing the blade. It is an object of the present application to provide an improved tool assembly and components thereof suitable for use in swiss-type machining applications, and to provide an improved method of securing components to holders. Disclosure of Invention According to a first aspect of the inventive subject matter, there is provided a retainer comprising opposing retainer first and second sides defining a first side direction from the retainer second side toward the retainer first side and a second side direction opposite the first side direction, opposing retainer front and rear ends defining a forward direction from the retainer rear end toward the retainer front end and a rearward direction opposite the forward direction side direction, opposing retainer top and bottom sides defining an upward direction from the retainer bottom toward the retainer top and a downward direction opposite the upward direction, a retainer pocket located at an intersection of the retainer first side, the retainer front end and the retainer top side, and a retainer clip located at the retainer top side, the retainer pocket comprising a pocket side abutment surface extending along the retainer first side and facing the first side direction, a pocket bottom abutment surface located below the pocket side abutment surface and facing the upward direction, and a rear abutment surface located behind the side abutment surface and facing the forward direction, the retainer clip extending above the side abutment surface and comprising a resilient clip, a hinge portion configured to bias the resilient clip from the hinge portion to the hinge portion, and a resilient clip portion configured to extend from the hinge portion to the hinge portion. In summary, the basic idea of the holder of the application is a so-called "normally closed" integrated, or more precisely resilient hinged clamp. While blade seats (also referred to as "blade pockets"; the seats of the present application are referred to as "holder seats" because they are part of the holder and will not be confused with the seats of the knives) are known for clamping on cutting blades, such configurations are generally not known for swiss tool assemblies. One reason is considered to be that during a typical swiss machining operation, the probe extends and impacts the cutting blade to locate its position. It will be appreciated that any blade that is not secured with screws (and in many cases two screws) raises the concern that the cutting blade will be displaced from the desired position when impacted by the probe. Thus, with few exceptions, a typical swiss-type machining tool assembly has a cutting blade with one or two openings for threadably mounting the cutting blade to a holder. Nevertheless, the present concept provides a secure installation and, to date, initia