SE547012C2

SE547012C2 - A shaping tool for machining a preformed cavity to achieve a non-circular cross-section

Info

Publication number: SE547012C2
Application number: SE2350665A
Authority: SE
Inventors: Jonathan Sharp; Juha Pehkonen; Matti Nord; Rickard Nilsson
Original assignee: Svensk Kaernbraenslehantering Ab
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2025-04-01
Also published as: SE2350665A1

Abstract

A shaping tool (1) for machining a preformed cavity (5) of a workpiece (6), the shaping tool (1) comprising a mounting part (11) arranged to be coupled to a machine tool (7); a support structure (12) comprising at least one external guiding mechanism (122) for guiding and supporting the shaping tool (1) in the preformed cavity (5); a shaft (15) configured to be driven by the machine tool (7); at least one cutter (16) comprising a tool bit (163), the cutter (16) being moveable between at least one retracted position and one or more extended cutting positions; a gearing mechanism (13) arranged to transfer movement of the shaft (15) to the at least one cutter (16) to move the at least one cutter (16) between the at least one retracted position and the one or more extended cutting positions, is provided. The shaping tool (1) is configured to be displaced axially along the cavity (5), whereby the tool bit (163) of the cutter (16) is fixed in a predetermined cutting position during the axial displacement of the shaping tool (1) and shapes an inner surface (51) of the preformed cavity (5) of the workpiece (6).

Claims

1. A shaping tool (1) for machining a preformed cavity (5) of a workpiece (6), the shaping tool (1) comprising: 5 - a mounting part (11) arranged to be coupled to a machine tool (7); - a support structure (12) comprising at least one external guiding mechanism (122) for guiding and supporting the shaping tool (1) in the preformed cavity (5)__.M§¿ç am av =~ =~ ~ ~ ~ =f~ :i 10 - a shaft (15) configured to be driven by the machine tool (7); - at least one cutter (16) comprising a tool bit (163), the cutter (16) being moveable between at least one retracted position and one or more extended cutting positions; - a gearing mechanism (13) arranged to transfer movement ofthe shaft (15) to the at least one cutter (16) to move the at least one cutter (16) between the at least one retracted 15 position and the one or more extended cutting positions, wherein the shaping tool (1) is configured to be displaced axially along the cavity (5)¿;j.§ g , whereby the tool bit (163) ofthe cutter (16) is fixed in a predetermined cutting position during the axial displacement of the shaping tool (1) and shapes an h-s.-. . .. J. . :rast-f Q ëàggkmt inner surface (51) of the preformed cavity (5) 'ïo._ of the workpiece (6).

2. The shaping tool (1) according to claim 1, further comprising a plurality of cutters (16).

3. The shaping tool (1) according to claim 2, wherein each of the plurality of cutters (16) is connected to the gearing mechanism (13), so that movement of the shaft (15) causes the plurality of cutters (16) to move synchronously. 25

4. The shaping tool (1) according to any one of the claims 1 to 3, wherein the at least one cutter (16) or each cutter (16) of the plurality of cutters (16), comprises a cutting holder (161) and a tool bit holder (162), the tool bit (163) being attached to the tool bit holder (162) and the tool bit holder (162) being attached to the cutting holder (161). z 2 The shaping tool (1) according to any one of the claims 1 to 4, wherein the guiding mechanism (122) comprises a plurality of sliding blocks (122') distributed along an outer perimeter of the support structure (12). n. .Q i~.\c-\\.~,\.,.~.\_~i~. \.c..\..\_\ u. en .MMQ . ., m. -.~, . .,\.\.-. The shaping tool (1) according to any one of the claims wherein the gearing mechanism (13) comprises a gear assembly (131) connected to the shaft (15) and to the at least one cutter (16), whereby rotational movement of the shaft (15) causes rotational movement of the at least one cutter (16). The shaping tool according to any one ofthe claims 1-=:ï.š_':_É_š_, wherein the gearing mechanism (13) comprises a substantially wedge-shaped displacement unit (132) arranged between the shaft (15) and the at least one cutter (16), whereby axial or rotational movement of the shaft (15) causes linear movement of the displacement unit (132), such that the displacement unit (132) displaces the at least one cutter (16) in a radial direction Method for machining at least one inner surface (51) of a preformed cavity (5) of a workpiece (6), by means of the shaping tool (1) according to any one of the claims 1 to coupled to a machine tool (7), the method comprising the following steps: arranging (s101) the shaping tool (1) at a first predetermined axial level (L1); positioning (s102) the shaping tool (1) so that the at least one cutter (16) is brought to a predetermined first radial position (R1), by rotating the shaping tool (1) and/or the workpiece (6) in relation to each other; and executing (s10 4) a first cutting cycle (CC1) by - controlling (s1041) the shaping tool (1) to move the cutter (16) to a predetermined cutting position (C1); and - controlling (s1042) displacement of the shaping tool (1) axially from the first predetermined axial level (L1) to a second predetermined axial level (L2), such that 3 the tool bit (163) of the cutter (16) shapes the inner surface (51) of the preformed cavity (5) of the workpiece (6). The method according to claim wherein the step of executing (s104) the first cutting cycle (CC1) further comprises: - controlling (s1043) the shaping tool (1) to move the at least one cutter (16) to a retracted position, such that a clearance is achieved between the tool bit (163) of the at least one cutter (16) and the inner surface (51) of the preformed cavity (5); and - controlling (s1044) displacement of the shaping tool (1) axially to return to the first predetermined axial level (L1). \^\ -1ïí:-i§~_ïlà:.=.The method according to claim íïíïilsëg, further comprising - positioning (s105) the shaping tool (1) so that the at least one cutter (16) is brought to a second predetermined radial position (R2), by rotating the shaping tool (1) or the workpiece (6) in relation to each other; and - executing (s106) a second cutting cycle (CC2), with the at least one cutter (16) positioned at the second predetermined radial position (R2), by - controlling (s1061) the shaping tool (1) to move the cutter to a second predetermined cutting position (C2); and - controlling (s1062) displacement of the shaping tool (1) axially from the first predetermined axial level (L1) to the second predetermined axial level (L2), such that the tool bit (163) of the cutter (16) shapes the inner surface (51) of the preformed cavity (5) of the workpiece (6). “= lLThe method according to any one of the claims to -iäf-l wherein the shaping tool (1) comprises a plurality of cutters (16) with respective tool bits (163), and the step of controlling (s1041, s1061) the shaping tool (1) to move the at least one cutter (16) to the predetermined cutting position (C1, C2) further comprises moving all of the plurality of cutters (16) synchronously.The method according to any one ofthe c|aims to i wherein the preformed cavity (5) is substantially cylindrical with a substantially circular cross-section and the method steps are performed to machine the inner surface (51) of the preformed cavity (5) to achieve a substantially non-circular cross-section. *:¿.A computer program (100) comprising instructions to execute the steps of the method of >~a any of the c|aims to :¿.A computer-readable medium (101) having stored thereon the computer program of c|aim