TURNING TOOL HOLDER ASSEMBLY

Description

I0207517 / CS Title: "TURNING TOOL HOLDER ASSEMBLY" Applicant: TECNOTOOLS di BARONI CORRADO DESCRIPTION Field of invention

[0001] The present invention relates to the field of industrial production by turning, in particular a tool holder assembly for holding a tool cutting to perform a turning operation via a lathe. State of the art

[0002] Turning is a process of industrial production carried out by removal of chip. It is defined by a rotary motion of the piece and a rectilinear motion of the tool.

[0003] The cutting edge of the tool penetrates the material of the piece and removes the excess part, or overmetal, thus forming a chip. The machine tool used for turning is the lathe.

[0004] The cutting tool is an element made of more material harder than the workpiece, and sometimes It has the shape of an interchangeable plate having at least one sharp edge suitable for making the cut. This sharp edge is called cutting edge.

[0005] The interchangeable plate-shaped tool It generally has an upper face and a lower face lower opposite, generally flat and parallel between them, and a plurality of lateral surfaces generally flat and orthogonal to the upper and lower faces, in whose cutting edges are formed by the intersections between the two faces and the lateral surfaces.

[0006] The interchangeable plate-shaped tool is configured to be mounted at a free end of a support element having an elongated shape, called “tool holder”, or “stem”.

[0007] This plate-shaped tool can be mounted to the tool holder in a plurality of positions assembly, where in each mounting position a respective cutting edge is exposed in position cut.

[0008] This is used to be able to rotate or tilt the tool to the plate if the cutting edge in use is worn, to use a new cutting edge.

[0009] Among the interchangeable mechanical assembly systems of the plate tool to the stem is known a lever device capable of holding firmly the plate tool in a suitable seat made in the tool holder.

[0010] Such a lever system comprises a lever element having a substantially “L”-shaped shape, in which the loads are applied to the two free ends of the lever element, and in which the fulcrum is in correspondence of a point of union between the two sections straight lines of the lever element.

[0011] This system also includes a screw, the tightening pushes a first free end of the element rotating it around the fulcrum, so that the other free end of the lever element pushes sideways against a lateral surface of the plate tool holding it in its seat in the stem.

[0012] This known system has the disadvantage that the the realization of the lever element is rather expensive, as it requires at the same time a tight dimensional tolerance and high performance of mechanical resistance. The lever element, in fact, must to be able to rotate in the correct way, and at the same time, ensure the mechanical seal of the plate tool during the high stresses that develop during processing.

[0013] A fastening system for fixing a plate-type tool on the stem, so-called “clamp” tool, comprising a clamp element that holds the plate cutting tool in its seat in the stem, compressing it on its upper face against the seat itself. The clamp element is pressed against the plate tool by tightening a special tightening screw.

[0014] This fastening system has the disadvantage to present an encumbrance above the face upper part of the tool, as the clamp element is physically placed above the upper face of the tool to push it against the seat in the stem.

[0015] Another known fastening system provides for a tightening screw passing through a central hole of the plate-shaped tool, screwed into a corresponding threaded hole in the tool seat.

[0016] Again, the head of the screw clamping protrudes axially from the face upper outer part of the tool, forming a bulk external to the tool.

[0017] These solutions in which the fastening system protrudes from the upper external face of the tool are not suitable for making some turning operations as they would collide with the workpiece.

[0018] It is therefore felt that there is a need to put in place arrangement of a turning tool holder assembly which guarantees optimal mechanical seal of the turning tool in its seat in the shank tool holder, avoiding cluttering the surface top of the tool and avoiding the need for expensive side locking mechanisms. Summary of the invention

[0019] The purpose of the present invention is to devise and make available a set of turning tool holder that allows to satisfy the the aforementioned needs and to at least partially overcome the inconveniences complained about above with reference to the known technique.

[0020] In particular, the aim of the present invention is that of making available a set of turning tool holder that ensures a tight fit optimal mechanics of the turning tool in its seat in the tool holder stem, avoiding cluttering the upper surface of the tool and avoiding the need for expensive side locking mechanisms.

[0021] These and further purposes and advantages are achieved by means of a turning tool holder assembly in agreement with the independent claim.

[0022] Further purposes, solutions and advantages are present in the embodiments described below and claimed in the dependent claims. Brief description of the drawings

[0023] The invention will be illustrated below with the description of some of its embodiments, made by by way of example and not as a limitation, with reference to to the attached drawings in which:

[0024] - Figure 1 illustrates an isometric view of a making a tool holder body of an assembly turning tool holder according to the invention;

[0025] - Figure 2 illustrates a top view of the body tool holder of figure 1;

[0026] - Figure 3 illustrates a sectional view of the tool holder body of figure 2 according to a plane of section III;

[0027] - Figure 4 illustrates a side view of the body tool holder of figure 1 according to direction IV;

[0028] - Figure 5 illustrates a front view of the body tool holder of figure 1 according to direction V;

[0029] – Figure 6 illustrates an orthogonal view from the top of the tool holder body in figure 1;

[0030] – Figure 7 shows a sectional view of the tool holder body of figure 6, through a plane of section VII;

[0031] – Figure 8 illustrates a sectional view of the tool holder body of figure 6 through a plane of section VIII;

[0032] – Figure 9 shows an exploded drawing of a turning tool holder assembly according to the invention, in which a tool is also represented turning cutting;

[0033] – Figure 10 shows an orthogonal top view of an anchor pin of a tool holder assembly according to the invention;

[0034] – Figure 11 shows a side view of the anchor pin of figure 10;

[0035] – Figure 12 shows an orthogonal view from below of the anchor pin of figure 10;

[0036] – Figure 13 shows an orthogonal view from below according to direction XII of a mounting bracket of a tool holder assembly according to the invention;

[0037] – Figure 14 shows a side orthogonal view according to the direction XIV of the mounting bracket of the figure 13;

[0038] – Figure 15 shows an orthogonal top view according to the XV direction of the mounting bracket of figure 13. Description of preferred embodiments

[0039] With reference to the figures, an assembly of turning tool holder according to the invention, is overall indicated with the reference 1.

[0040] This tool holder assembly is configured for securely hold a turning cutting tool interchangeable having known characteristics.

[0041] In particular the interchangeable cutting tool, or turning, in the reference sector it is generally also called “insert” or “plate”.

[0042] The turning tool holder assembly 1 comprises a tool holder body 10 having a stem portion 11 having an elongated shape and a head portion 12 placed at a free end of said portion stem 11.

[0043] The head portion 12 comprises a seat assembly 20 defined by a seat bottom surface 21 delimited by a plurality of sides 22, 23, 24, 25, from a first lateral contact surface 26 which is extends from a first side 22 of said plurality, and from a second lateral contact surface 27 which is extends from a second side 23 of said plurality.

[0044] The first side 22 and the second side 23 are adjacent between them and form an opening angle between them fixed α less than 180°.

[0045] The mounting seat 20 is open at of the remaining sides 24, 25 of said plurality of sides.

[0046] The turning tool holder assembly 1 comprises a mounting bracket 40 having a surface lower bracket 41, a first counter-surface of counter 46 and a second counter-surface of feedback 47.

[0047] The lower surface of bracket 41 is configured to be placed against the surface of bottom of seat 21.

[0048] The first counter-surface 46 has the shape complementary to the first lateral surface of I find 26 and it is configured to be available to struck against the first lateral contact surface 26, and the first counter-surface 26 and the lower surface of bracket 41 form a first lower connecting line 42.

[0049] The second counter-surface 47 has complementary form to the second surface lateral support 27 and is configured to be arranged to abut against the second lateral surface of feedback 27.

[0050] The second counter-surface 27 is called lower surface of bracket 41 form a second lower connecting line 43.

[0051] The mounting bracket also includes a first lateral thrust surface 48 arranged orthogonal to the lower surface of bracket 41 and parallel to the first lower connecting line 42, and a second lateral thrust surface 49 orthogonal to the lower surface of bracket 41 and parallel to the second lower connecting line 43.

[0052] The first lateral thrust surface 48, the second lateral thrust surface 49 and the surface at the bottom of seat 21 define a reception room 44 to accommodate a 100 cutting tool.

[0053] The turning tool holder assembly 1 comprises an anchor pin 60 extending along an axis CC power plant and includes a first end portion free 61 fixed to mounting seat 20 in correspondence of the reception compartment 44, and a opposite second portion of free end 62 protruding with respect to the bottom surface of seat 21.

[0054] In accordance with one embodiment, the central axis CC it is arranged orthogonally to the bottom surface seat 21.

[0055] In accordance with one embodiment, the pin of anchor 60 has cylindrical symmetry around the axis CC power plant.

[0056] The turning tool holder assembly 1 comprises at least one tightening screw 71, 72 that can be screwed into a respective threaded hole 32, 33 made in the seat of assembly 20 starting from the bottom surface 21.

[0057] According to an embodiment, said at least one tightening screw 71, 72 includes a first screw tightening screw 71 and a second tightening screw 72.

[0058] In accordance with an embodiment, each of said at least one threaded hole 32, 33 has the respective axis arranged orthogonally to the bottom surface 21.

[0059] The mounting bracket 40 includes at least one hole clamping loop 51, 52, each of said at least one through hole clamping 51, 52 being configured for be crossed by one of the said at least one tightening screw 71, 72.

[0060] The first lateral contact surface 26 is inclined with respect to the bottom surface of seat 21 according to a first predetermined inclination angle β1, and the second lateral contact surface 27 is inclined with respect to the bottom surface of seat 21 according to a second predetermined inclination angle β2.

[0061] The first fixed inclination angle β1 and the according to the predetermined inclination angle β2 are greater than 90°.

[0062] Each of said at least one through hole of clamping 51, 52 is sized to be crossed from one of said at least one tightening screw 71, 72 with radial play to allow movement of the mounting bracket 40 versus mounting seat 20 transversely to the axes of said at least one screw tightening 71, 72, so that, by tightening said at least one clamping screw 71, 72, the bracket of assembly 40 is pulled towards the bottom surface seat 20, and the first counter-surface 46 and the second contact surface 47 of the bracket of assembly 40 slide along the first surface of lateral surface 26 and the second lateral surface of the assembly seat 20 respectively, pushing the first lateral surface of thrust 48 and said second lateral surface of pushing 49 of said mounting bracket 40 towards said anchor pin 60 in radial direction with respect to said anchor pin 60, to hold and block the cutting tool 100 between said first surface lateral thrust surface 48, called second lateral surface of thrust 49 and said anchor pin 60.

[0063] According to one embodiment, said at least one through hole clamping includes a first hole clamping pass-through 51 and a second passing hole of tightening 52.

[0064] In accordance with one embodiment, said first hole clamping loop 51 is interposed between said first counter-surface 46 and the first one lateral thrust surface 48, and wherein said second through hole for clamping 52 is interposed between said second counter-surface 47 and said second lateral thrust surface 49.

[0065] In accordance with one embodiment, the bracket of assembly 40 features a bracket top surface 53 opposite to said lower surface of bracket 41, preferably parallel to said lower surface of bracket 41.

[0066] According to one embodiment, said at least one through hole for clamping 51, 52, includes a 51', 52' flare sized to accommodate completely inside it an enlarged head 71', 72' of said at least one tightening screw 71, 72.

[0067] In this way, it is avoided that said enlarged head 71', 72' protrudes axially from said surface upper bracket 53.

[0068] Said head portion 12 defines a surface upper portion of head 13 from which it starts extends said mounting seat 20.

[0069] According to one embodiment, the surface upper bracket 53 is arranged flush with said upper surface of head portion 13, for example extends with continuity of shape with respect to the said upper surface of head portion 13.

[0070] According to one embodiment, the first angle of preset inclination β1 is between 91° and 179°, preferably between 100° and 120°, even more preferably it is around 110°.

[0071] According to one embodiment, the second angle of preset inclination β2 is between 91° and 179°, preferably between 100° and 120°, even more preferably it is around 110°.

[0072] According to one embodiment, the first angle of fixed inclination β1 and the second angle of fixed inclination β2 have equal values ​​between them.

[0073] According to one embodiment, the surface of seat bottom 21 is a flat surface.

[0074] According to one embodiment, the first surface side of the 26 is a flat surface.

[0075] According to one embodiment, the second lateral contact surface 27 is a surface flat.

[0076] According to one embodiment, the surface of seat bottom 21, the first lateral contact surface 26, the second lateral contact surface 27 are all flat surfaces.

[0077] The value of the opening angle α is chosen in function of the geometric characteristics of the tool 100% cut commercially available.

[0078] For example, in the case of a triangular tool, the opening angle α is 60°; in the case of the tool square, the opening angle α is 90°; in the case of rhombus or trigonal tool, the opening angle is 80°.

[0079] These values ​​of the angle α are given only as dimensional example as they correspond to the geometry of interchangeable cutting tools for turning known and commercially available, however not it is intended to limit the opening angle α to these values specific.

[0080] In accordance with one embodiment, the central axis CC of the anchor pin 60 is incident with the line bisector of the fixed opening angle α.

[0081] According to one embodiment, the first portion end 61 of the anchor pin 60 has a external thread 63 and mounting seat 20 includes a corresponding internally threaded hole 31 made in the bottom surface 21 of the seat of assembly 20.

[0082] In accordance with one embodiment, the pin of anchor 60 includes a key insertion seat 64 in the first free end 61, arranged coaxially with the central axis CC.

[0083] In accordance with one embodiment, the pin of anchor 60 includes a key insertion seat 65 in said second free end 62, arranged coaxially with the central axis CC.

[0084] According to one embodiment, the first surface lateral thrust surface 48 and the second lateral surface of thrust 49 are flat, or at least partly flat.

[0085] In accordance with one embodiment, the assembly of turning tool holder 1 includes at least one spring of compression 90 interposed between the bottom surface 12 and the mounting bracket 40, arranged coaxially with said at least one tightening screw 71, 72.

[0086] In accordance with one embodiment, the assembly of turning tool holder 1, includes a plate sub-tool 80 configured to be accommodated in a second seat 81 built in the portion at head 12 starting from the bottom surface 21 in correspondence of the reception compartment 44.

[0087] In accordance with one embodiment, the sub-plate tool 80 has a plate top surface sub-tool 82 arranged flush with the surface of bottom 21.

[0088] In accordance with one embodiment, the sub-plate tool 80 has a through hole 84 suitable for being crossed by the anchor pin 60.

[0089] In other words the through hole 84, in such realization, it is coaxial with the threaded hole internally 31 made in the bottom surface 21 of the assembly site 20.

[0090] In accordance with one embodiment, the pin of anchor 60 includes a clamping ring 66 protruding radially and interposed between the first portion of free end 61 and the second end portion free 62, configured to retain said plate sub-tool 80 against said second seat 81.

[0091] In accordance with one embodiment, the seat of assembly 20 has a drain hole 28 placed between it between the first lateral contact surface 26 and the second lateral contact surface 27.

[0092] In accordance with one embodiment, the bracket of assembly 40 includes a bracket drain hole 55 interposed between the first counter-surface 46 and the second counter-surface 47.

[0093] According to an implementation, the second seat 81 has two lateral surfaces 83, 84 suitable for containing laterally the under-tool plate 80,

[0094] According to an implementation, the second seat 81 includes a second seat drain hole 85 interposed between the two lateral surfaces 83, 84.

[0095] To the embodiments of the above device described, a technician in the field, to meet needs contingent, may make changes, adaptations and replacement of elements with functionally different ones equivalent, without thereby departing from the scope of following claims. Each of the features described as belonging to a possible form of realization can be done independently from the other embodiments described. *** * ***

Claims

1. Turning tool holder assembly (1) including: - a tool holder body (10) having a portion a stem (11) having an elongated shape and a head portion (12) arranged at a free end of said portion stem (11), said head portion (12) comprising a mounting location (20) defined by a surface of seat bottom (21) delimited by a plurality of sides (22, 23, 24, 25), from a first lateral surface of feedback (26) which extends from a first side (22) of said plurality, and from a second lateral surface of feedback (27) which extends from a second side (23) of said plurality, said first side (22) and said second side (23) being adjacent to each other and forming an angle of predetermined opening (α) between them less than 180°, and in where said mounting seat (20) is open in correspondence of the remaining sides (24, 25) of the said plurality of sides; - a mounting bracket (40) having a surface lower bracket (41), a first counter-surface of counter (46) and a second counter-surface of counter (47), said lower surface of bracket (41) being configured to be placed against said bottom surface seat (21), said first counter- contact surface (46) having complementary shape with respect to said first lateral contact surface (26) and being configured to be arranged in abutment against said first lateral contact surface (26), said first counter-surface (26) and said lower surface of bracket (41) forming a first lower connecting line (42), called second counter-surface (47) having shape complementary to the said second surface lateral check (27) and being configured for be placed against said second surface lateral counter (27), called second counter- contact surface (27) and said lower surface of bracket (41) forming a second line of between them lower fitting (43), called mounting bracket further comprising a first lateral surface of thrust (48) arranged orthogonally to said surface lower bracket (41) and parallel to said first line of lower connection (42), and a second surface lateral thrust (49) orthogonal to said surface lower bracket (41) and parallel to said second lower connecting line (43), where the first one is said lateral thrust surface (48), called second lateral thrust surface (49) and said thrust surface seat bottom (21) define a reception area (44) to accommodate a cutting tool (100) avoiding clutter the upper surface of the tool; - an anchor pin (60) extending along a central axis (CC) and includes a first portion of free end (61) fixed to said mounting seat (20) in correspondence with said reception space (44), and an opposite second free end portion (62) protruding from said seat bottom surface (21); - at least one clamping screw (71, 72) that can be screwed into a respective threaded hole (32, 33) made in said mounting location (20) starting from said surface of bottom (21), said mounting bracket (40) comprising at least one through-hole clamping (51, 52), each through hole clamping being configured to be crossed by one of the said at least one screw tightening (71, 72); in which - said first lateral contact surface (26) is inclined with respect to the said seat bottom surface (21) according to a first predetermined inclination angle (β1), and said second lateral contact surface (27) is inclined with respect to the said seat bottom surface (21) according to a second predetermined inclination angle (β2), called the first fixed inclination angle (β1) and said second fixed inclination angle (β2) being greater than 90°, - each of said at least one through-hole for tightening (51, 52) is sized to accommodate a respective of said at least one tightening screw (71, 72) with play radial so as to allow movement of said mounting bracket (40) with respect to said seat assembly (20) transversely to the axes of said at least a clamping screw (71, 72); so that: by tightening said at least one screw clamping (71, 72), said mounting bracket (40) is pulled towards said seat bottom surface (20), and said first counter-surface (46) and said second counter-surface (47) of said bracket assembly (40) slide along said first surface of lateral contact surface (26) and said second surface lateral support (27) of said mounting seat (20), pushing said first lateral thrust surface (48) and said second lateral thrust surface (49) of said mounting bracket (40) towards said pin anchoring (60) in a radial direction with respect to said anchor pin (60), to hold and lock said cutting tool (100) between said first surface lateral thrust surface (48), called second surface lateral thrust (49) and said anchor pin (60).

2. Turning tool holder assembly (1), according to the claim 1, wherein said first angle of predetermined inclination (β1) and / or said second angle of preset inclination (β2) is between 91° and 179°, preferably between 100° and 120°, even more preferably it is around 110°.

3. Turning tool holder assembly (1), according to the claim 1 or 2, wherein said first angle of predetermined inclination (β1) and said second angle of fixed inclination (β2) have equal values ​​between They.

4. Turning tool holder assembly (1), according to the Claim 1, wherein said seat bottom surface (21) is a flat surface, and / or in which the first lateral contact surface (26) is a surface flat, and / or in which said second lateral surface of feedback (27) is a flat surface.

5. Turning tool holder assembly (1), according to the claim 1, wherein said central axis (CC) of said anchor pin (60) is incident with the line bisector of the preset opening angle (α).

6. Turning tool holder assembly (1), according to the claim 1, wherein said first portion of end (61) of said anchor pin (60) has an external thread (63), and said mounting seat (20) includes a corresponding threaded hole internally (31), made in said surface of bottom (21) of said mounting seat (20).

7. Turning tool holder assembly (1), according to the claim 6, wherein said anchor pin (60) comprises a key insertion seat (64) in said first free end (61) arranged coaxially with said central axis (CC), and / or where said anchor pin (60) comprises a key insertion seat (65) in said second free end (62) arranged coaxially with said central axis (CC).

8. Turning tool holder assembly (1), according to at least one previous claim, in which the said first lateral thrust surface (48) and said second lateral thrust surfaces (49) are flat, or at least partly flat.

9. Turning tool holder assembly (1), according to at least one preceding claim, including at least a compression spring (90) interposed between said bottom surface (12) and said mounting bracket (40), arranged coaxially with said at least one screw tightening (71, 72).

10. Turning tool holder assembly (1), according to at least one preceding claim, comprising a under-tool plate (80) configured to be welcomed in a second location (81) built in the said head portion (12) starting from said surface of bottom (21) corresponding to said compartment reception (44), said under-tool plate (80) for tool having a through hole (84) suitable for being crossed by said anchor pin (60).

11. Turning tool holder assembly (1), according to claim 10, wherein said anchor pin (60) comprises a protruding clamping ring (66) radially and interposed between said first portion of free end (61) and said second portion of free end (62), configured to retain said under-tool plate (80) against said second seat (81).

12. Turning tool holder assembly (1), according to at least one previous claim, where said seat mounting (20) has a drain hole (28) interposed between said first lateral surface of check (26) and said second lateral surface of feedback (27).

13. Tool holder assembly (1), according to at least one preceding claim wherein said bracket mounting (40) includes a bracket drain hole (55) interposed between said first counter-surface of counter (46) and said second counter-surface of feedback (47).

14. Tool holder assembly (1), according to the claim 10, wherein said second seat (81) has two lateral surfaces (83, 84) designed to contain laterally said under-tool plate (80), and a second seat drain hole (85) placed between said two lateral surfaces (83, 84).

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