MXPA99010644A - A cutting tool assembly and a replaceable cutting head for use therein - Google Patents

Abstract

A cutting tool assembly (1, 101) for rotary cutting operations comprising a replaceable cutting head (2, 102) and a tool shank (4, 104) having a common longitudinal axis (6, 106) and mating peripheral surfaces (16, 43, 120). The cutting head has a cutting head mounting portion (14, 114) at a trailing end (15, 130) thereof and the tool shank has a cutting head receiving portion (44, 144) at a front face thereof. The cutting head mounting portion (14, 114) and the cutting head receiving portion (44, 144) of the tool shank each have at least two coupling portions (20, 120) bound by associated peripheral surface of the cutting head (2, 102) and the tool shank (4, 104) and mating in shape and dimensions. Each coupling portion has a base surface (22, 48, 122, 148), a torque transmission wall (26, 52, 126, 152) and a fixation wall (28, 54, 128, 154), the fixation wall of each cutting head coupling portion having an angular extension smaller than a corresponding angular distance between adjacent extremities of the fixation walls of two different tool shank coupling portions.

Description

CUTTER TOOL ASSEMBLY AND A REPLACEABLE CUTTER HEAD TO USE ON THE SAME DESCRIPTION OF THE INVENTION The present invention refers to a tool assembly comprising at least two members releasably coupled in such a way as to allow the transfer of a rotating torsion from one member to the other. The invention particularly relates to a cutting tool assembly comprising a replaceable cutting head and a tool handle on which the cutting head is mounted, for use in rotary cutting operations such as drilling, rolling, and the like. An example of a rotary cutting tool assembly having a coupling arrangement of the type specified above is described in EP 0742065. The assembly comprises first and second assembly components having internal female and male fit coupling members formed on their faces. interaction, the coupling members have arm portions radially directed for torsion transmission, and a centering torque located therebetween. The cutting tool is assembled by inserting the male coupling member into the female coupling member and coaxially coupling them together by a locking screw.

The use of locking screws in cutting tool assemblies of the aforementioned type weakens the cutting tool and severely limits the miniaturization of the tool in terms of small diameter cutting tools, especially when these tools have axially extended burr folds, and, consequently, they do not have a sufficiently large cross-sectional area and a tool body strong enough to accommodate appropriate locking screws. The problem is even more critical with regard to the rotary cutting tools which have interchangeable cutting heads with a cutting edge that extends towards the center of the cutting tool, since it is inconceivable to secure the cutting heads by means of an insurance screw which passes through the central axis. EP 0118 806 discloses a drilling tool assembly which comprises a cylindrical tool handle formed with two folds of burr extending generally along "the longitudinal axis thereof and a replaceable plate-shaped drilling head mounted thereon. in a self-clamping manner without requiring a locking screw The drilling head comprises two substantially flat cutting portions diametrically disposed in the form of cutting plates and the tool handle has a slot receiving the drilling head defined between two radially oriented notches. and diametrically disposed formed on the side surfaces of the folds with burr and extending along in the axial direction, the notches engage with and are capable of receiving the cutter plates of the drilling head. narrow base oriented substantially perpendicular to the axis of the tool and are adapted to provide axial support of the cutting head in the tool handle, and high side walls transversely oriented to the surfaces of the base and functioning as torsion transmission walls. It should be noted that, in the previous drilling tool, the relatively small width of the base surface is insufficient to withstand the axial forces exerted on the tool during cutting operations. In addition, the drill head with an elongated planar configuration as mentioned above is weak, when employed under torsional conditions. In addition, the tools have a small base area relative to the cross sectional area of their tool handle and also in relation to the height of their torsion transmission panels, which leads to its instability. At least for these reasons, the drilling head of the previous flat design can hardly be applied to small cutting tools and, particularly, to miniature cutting tools. It is the object of the present invention to provide a new cutting tool assembly and a new cutting head for use therewith. In accordance with one aspect of the present invention, there is provided a cutting tool assembly for cutting-rotary operations comprising a replaceable cutting head and a tool handle having a common longitudinal axis and peripheral mating surfaces.; the cutting head has an adjacent cutting portion, a leading end and a cutting head mounting portion adjacent a rear end thereof, and the tool handle has a cutting head receiving portion formed on a front face of the cutting head. same, the cutting head mounting portion and the cutting head receiving portion of the tool handle, each having at least two coupling portions, the cutting head coupling portions and the coupling portions of the handle of the cutting head. tool are joined by the peripheral surfaces and coupling in shape and dimensions; each coupling portion has a base surface that extends transversely to the longitudinal axis and is adapted to engage an axial support of the cutting head in the tool handle, a torsion transmission wall extends in a generally radial direction with relation to the longitudinal axis and is oriented transversely to the base surface, and an attachment wall arranged adjacently and extending transversely to the torsion transmission wall and circumferentially relative to the longitudinal axis, the fixing wall of each portion of cutting head coupling has an angular extension smaller than a corresponding angular distance between the adjacent ends of the fixing walls of two different tool handle coupling portions; the cutting tool is initially assembled by placing the cutting head mounting portion in a manner relative to the cutting head receiving portion for inserting the fixing walls of the cutting head coupling portions between the respective fixing walls of the cutting portions. of coupling the handle of the tool, and subsequently rotating the cutting head relative to the handle of the tool until the cutting head coupling portions are fully overlapped with the coupling portions of the corresponding tool handle with their base surfaces and the transmission walls joining together and their fastening walls interact coaxially in a male-female interlock manner, thereby providing self-suction of the cutting head on the tool handle. Preferably, the cutting head coupling portions and the coupling portions of the tool handle have stepped coupling configurations, each having a pair of base surfaces of which one surface is raised and the other is lowered, the surfaces of base are joined by the torsion transmission wall. Preferably, each coupling twist is in the form of a protrusion comprising the raised base surface and a notch comprising the lowered base surface. When the cutting tool is designed for cutting operations of the type requiring burr evacuation folds, such as drilling, the number of coupling portions in the cutting head and the tool handle preferably corresponds to the number of folds. In this case, each coupling portion extends between two contiguous folds in such a way that its lowered surface is joined by one of the folds and the torsion transmission wall and its raised surface is joined by the other fold and the transmission wall. of torsion.

According to another aspect of the present invention, there is provided a replaceable cutting head that can be mounted on a tool handle having a front cutting head receiving portion formed with at least two coupling portions, each joined by a peripheral surface of the tool handle and formed with a base surface, a torsion transmission wall and a fixing wall; the cutting head has a peripheral surface that engages the peripheral surface of the tool handle, a cutting portion adjacent to the leading end and a cutting head mounting portion adjacent to the trailing end thereof, the cutting head mounting portion it is formed with at least two coupling portions joined by the peripheral surface of the cutting head; each engaging portion of the cutting head has a longitudinal axis and a base surface that extends transversely to the longitudinal axis and is adapted to participate in an axial support of the cutting head on the tool handle, a torsion transmission wall it extends in a generally radial direction relative to the longitudinal axis and is oriented transversely to the base surface, and a fixing wall is provided adjacent and transversely to the torsion transmission wall and circumferentially relative to the longitudinal axis, the wall The fastening of each cutting head coupling portion has an angular extension smaller than a corresponding angular distance between the adjacent ends of the fastening walls of two different tool handle coupling portions. When the handle of the tool on which the cutting head is mounted has folds of burr, preferably the cutting head is formed with sections of burr folds, which are continuously joined with the burr folds of the tool handle. With this, the whole assembly has a complete uniform design and the continuous burr folds of it allow a very uniform burr evacuation. The tool assembly according to the present invention can be further provided with a securement arrangement for example in the form of a slit in the handle of the tool, to elastically secure the cutting head therein. The coupling arrangement according to the present invention allows the cutting head and the tool handle to have very strong wide ends with a maximum available cross sectional area and low torsion transmission walls whereby the stability of the tool assembly Cutter is improved. The coupling arrangement also allows the transmission of large torsions from the tool handle to the cutting head, and is capable of withstanding large axial forces faced therein during cutting operations such as drilling. The coupling arrangement of the present invention is particularly useful for assembling miniature cutting tools, especially when the assemblies are provided with burr evacuation folds. Yet another aspect of the present invention is connected with a device for assembling and disassembling the cutting tool assembly defined above. BRIEF DESCRIPTION OF THE DRAWINGS For a better understanding of the present invention and to show how it can be carried out in practice, reference will now be made to the attached drawings, which: Figure 1 is a schematic isometric view of a cutting tool assembly, before assembly, according to one embodiment of the present invention; Figure 2 is an isometric lower view of a cutting head of the cutting tool assembly shown in Figure 1; Figure 3 is a bottom plan view of the cutting head shown in Figure 2; Figure 4a is a partial isometric view of a tool handle of a cutting tool assembly shown in Figure 1; Figure 4b is a partial isometric view of an alternative embodiment of the tool handle shown in Figure 4a; Figure 5 is a front view of the handle of the tool shown in Figure 4; Figure 6 is an isometric view of the cutting tool assembly as shown in Figure 1, at an initial stage of assembly; Figure 7 is an isometric view of the cutting tool assembly as shown in Figure 1, assembled; Figure 8 is a cross-sectional view of the cutting tool assembly shown in Figure 7; Figure 9 is an isometric schematic view of a cutting tool assembly, before assembly, according to another embodiment of the present invention; Figure 10 is an isometric view of a cutting head of the cutting tool assembly shown in Figure 9; Figure 11 is a partial isometric view of a tool handle of the cutting tool assembly shown in Figure 9; Figure 12 is a cross-sectional view of the cutting tool assembly shown in Figure 9, assembled; Figure 13 is an isometric view partially in cross section of a cutting tool assembly shown in Figure 9, at an initial stage of assembly; and Figures 14 and 15 illustrate different embodiments of an assembly device that is used with the cutting tool shown in Figures 9 to 13. A cutting tool assembly according to the present invention, which is used in drilling operations, generally it is illustrated in Figures 1 and 9. The cutting tool assembly 1 shown in Figure 1 comprises a replaceable solid cutting head 2 of the disposable type and a tool handle 4 having a longitudinal axis 6, and a rotational symmetry of 180 ° with respect to the longitudinal axis 6, adapted to be assembled in a self-clamping manner. The cutting head 2 and the tool handle 4 are formed with respective crease sections 8a, 10a and 8b, 10b in such a way that when the cutting tool is assembled, the sections 8a and 8b and the sections 10a and 10b form continuous, preferably helical, pleats 8 and 10 extending from the cutting head 2 to the rear part of the tool handle. As illustrated in Figures 2 and 3, the cutting head 2 has a cutting portion 12 adjacent the leading end of the cutting head 13 and a cutting head mounting portion 14 adjacent the rear end of the cutting head 15. The cutting portion 12 of the cutting head will not be described here since it does not constitute the subject matter of the present invention. However, it should be noted that the cutting portion 12 of the cutting head can have any appropriate design. As seen in Figure 2, the cutting head mounting portion 14 has a peripheral surface 16 and comprises a pair of cutter head coupling portions 20 diagonally disposed, each joined by the peripheral surface 16 and the fold sections burr 8a and 10a. Each cutting head coupling portion 20 has a single-step configuration with a base surface 22 lowered adjacent a burr-fold section 8a, 10a, a raised base surface 24a adjacent the other burr-fold section 10a , 8a and a torsion transmission wall 26 therebetween, which all extend from the peripheral surface 16 of the cutting head mounting portion 14 towards the longitudinal axis 6. The base surface 22 lowered and the transmission wall of torsion 26 both terminate in a fastening wall 28 which joins the torsion transmission wall 26 by means of a rounded corner 27 and forms with the drop surface 22 and the torsion transmission wall 26 a notch 29. The cutting head coupling portions 20 have a central base surface 30 which extends therebetween and joins the surface with raised bases 24 thereof. As you can see in Figure 2, the surfaces lowered, raised and central 22, 24 and 30 of. the cutting head are substantially flat and are oriented generally perpendicular to the longitudinal axis 6, and the torsion transmission wall 26 and the fixing wall 28 are transverse to the base surfaces 22 and 24. As can be seen in Figure 3 , the torsion transmission wall 26 of each cutting head coupling portion 20 extends generally radially with respect to the longitudinal axis 6 and is sharply inclined relative to the base surface 22 and 24. It should be understood that the transmission wall of twist 26 does not necessarily need to be a flat surface but may be in the form of a curved surface, only a portion of which extends radially. In addition, the torsion transmission wall 26 may be obtusely inclined or perpendicular to the base surfaces and may not extend exactly in the radial direction but may be oriented at an angle towards this direction. An axial dimension d (Figure 2) of the torsion transmission wall 26 of each cutting head coupling portion 20 is substantially less than a distance D (Figure 3) between the radially outermost points 21 'and 21"of the sections of respective burst folds 8a and 10a. The axial dimension d does not exceed and, preferably, is substantially less than half the distances D and is less than a height H (Figure 2) of the cutting head 2 measured between the leading end 13 and the base surfaces lowered 24 of it. As can be seen in Figure 3, the fixing wall 28 extends circumferentially with respect to the longitudinal axis 6, along the base surface 22 lowered. Alternatively, the fixing wall 28 may extend along the entire coupling portion 20 or any portion thereof. As can also be seen in Figures 1, 2, 6 and 7 and as best shown in Figure 8, the fixing walls 28, have the shape of dovetail conical surfaces diverging in a direction away from the previous end cutting head 13. This conical surface of dovetails has an axis (not shown) which coincides with the longitudinal axis 6 and may have various suitable shapes such as, for example, spiral, elliptical or the like. As shown in Figures 4a and 5, the handle of the tool 4 has a front face 40 with a cutting head receiving portion 42 formed therein. The cutting head reception portion 42 has a peripheral surface 43 that engages, in dimensional form, with the peripheral surface 16 of the cutting head mounting portion 14. The cutting head receiving portion 42 has portions of the coupling head 42. tool handle 44 diametrically disposed which engage in shape and dimensions with the cutting head coupling portions 20. Thus, each tool handle coupling portion 44 comprises a raised base surface 48, a base surface 50 lowered , a torsion transmission wall 52 therebetween and a dovetail fixing wall 54 which is joined to the torsion transmission wall 52. The raised base surface 48 and the torsion and fixing transmission walls 52 and 54 define between it the projections 56 that engage with and adapt to be received in the notches 29 of the cutting head mounting portion 14. The tool handle coupling portions 44 have a central base surface 60 therebetween. The high, lowered and central base surfaces 48, 50 and 60 and the torsion and fastening transmission walls 52 and 54 of the tool handle coupling portions 44 correspond in orientations and dimensions to the respective lowered base surfaces, high and central 22, 24 and 30 and the torsion and fixing transmission walls 26 and 28 of the cutting head coupling portions 20, the arrangement however is such that the fixing walls 28 of the cutting head coupling portions 20 have the angular extension ac (Figure 3) smaller than the angular distance ßt (Figure 5) between the ends of the fixing walls 54 of the tool handle coupling portions 44. "The fixing walls 28 and 54 of the coupling portions 20 and 44 of the respective cutting head 2 and the tool handle 4 are designed to have an interference fit between the The interference fit between the fixing walls 28 and 54 can alternatively be achieved by forming, in the tool holder 4, an elastic groove 62 as shown in Figure 4b, as can be seen in Figures 2, 3 and 4a, the cutting head and the handle of the tool are additionally provided with respective female and male guide members 64 (Figure 2) and 66 (Figure 4a), which can also be accommodated vice versa sa, for the initial alignment of the cutter head 2 on the handle of the tool 4. As illustrated in Figure 6, the cutting head mounting portion 14 of the cutting head 2 is mounted on the cutting head receiving portion. 42- of the handle of the tool 4 by transverse insertion of the cutting head coupling portions 20 between the projections 56 of the coupling portions of the tool handle 44, and rotating the cutting head 2 in the direction A ( opposite direction of the rotation of the cutting tool) so that its lowered base surfaces 22 slide along the raised base surfaces 48 of the coupling portions of the tool handle 44 until the torsion transmission walls 26 of the coupling portions of cutting head 20 is connected to the corresponding torsion transmission walls 52 in the coupling portions of the handle of the tool lie 44 and the projections 56 of the last coupling portions 44 are fully received within the notches 29 of the first coupling portions 20, and until the dovetail fixing walls 28 of the cutting head mounting portions 20. are coupled to the corresponding dovetail locking walls 54 of the coupling portions of the tool handle 44. In the tool holder shown in Figure 4b, the engagement between the fixing walls 28 and 54 is obtained due to the Elastic widening of the elastic slit 62. The cutting tool 1 described above, thus assembled, is illustrated in Figures 7 and 8. During a cutting operation, a wide axial support of the cutting head 2 on the tool handle 4 is provided by contacting the base surfaces 22 lowered from the cutting head 2 with the corresponding raised base surfaces 48 of the handle The tool 4. In addition, the axial support can be increased substantially by contacting the raised base surfaces 24 of the cutting head 2 with the base surfaces 50 lowered from the handle of the tool 4. The fixing walls 28 and 54 of , respectively, the cutting head 2 and the handle of the tool 4 function as fixing surfaces which interact co-axially in a male-female interblock manner and provide adequate securing of the cutting head in the tool holder during cutting and also prevents the cutting head from being dislodged from or coming out of the tool handle when the cutting tool is removed from a workpiece being machined. Figures 9 to 14 illustrate a cutting tool 101 according to another embodiment of the present invention, in which the coupling arrangement is generally similar to that of the cutting tool 1 illustrated in Figures 1 to 8, the differences between the same is that, in the cutting tool 101, the coupling portions of the tool handle and the cutting head have a two-level design with their fixing arrangement arranged at a different axial level than their base surfaces and their torsion transmission walls . Therefore, in the description of the cutting tool 101 below, reference will only be made to the parts thereof, which are relevant to the description of the fixing arrangement. As can be seen in Figure 9, the cutting tool 101 comprises a solid cutting head 102 and a tool handle 104 having a longitudinal axis 106 and two burr folds (not designated). The cutting head 102 shown separately in Figure 10, has a cutting portion 112 adjacent the leading end of cutting head 113 and a cutting head mounting portion 114 adjacent the rear end of the countersink head 115. The cutting head mounting portion 114 it comprises a pair of cutter head engaging portions 120 diametrically disposed, each having a base surface 122 lowered, a raised base surface 124, a torsion transmission wall 126 and a notch 129 formed therebetween. The handle of the tool 104 shown in Figure 11 has a front face 140 with a cutting head receiving portion 142 formed therein. The cutting head reception portion 142 has tool handle coupling portions 144 with raised base surfaces 148, base surfaces 150 lowered, torsion transmission walls 152 and projection 156 formed therebetween and engaging in shape and shape. dimensions with the notches 129 of the cutting head coupling portions 120. As can be seen in Figures 9, 10 and 11, the cutting tool 101 is provided with male and female fixing members * 200 and 210 formed respectively on the head cutter 102 and tool handle 104 and having radial dimensions substantially smaller than the radial dimension of the cutting head and the tool handle. The male fixing member 200 of the cutting head 102 exits the rear end 115 thereof and the female fixing member 210 of the tool handle 104 is depressed with respect to the front face 140 thereof. As shown in Figures 10 and 11, the male and female attachment members 200 and 210 of the cutting tool 101 have respective fixation conical walls 128 and 154 and central base surfaces 130 and 160 therebetween, which have the form and interact in a manner similar to that of the respective attachment walls 28 and 54 and the central base surfaces 30 and 60 of the cutting head coupling portions 20 and the tool handle coupling portions 44 of the cutting tool 1. In particular, like the cutting tool L, the cutting tool 101 has an angular distance between its adjacent ends of the fixing walls 154 of the tool handle 104 greater than an angular extension of the fixing walls 128 of the tool. cutting head 112. However, the angular extent of the fixing walls 128 in the cutting head 102 is greater than that of the fixing walls 28 d the cutting head 2, and the angular distance between the adjacent ends of the fixing walls 154 of the tool handle 104 is smaller than that between the fixing walls 54 and the tool handle 4. Furthermore, the base surfaces 124 The elevations of the cutting head engaging portions 120 of the cutting tool 101 each have an angular extension substantially less than the angular distance between the raised base surfaces 148 of the handle portions of the tool handle 144 thereof.

As can be seen in Figure 12, the conical fastening walls 128 and 154 of the male and female fastening members 200 and 210 diverge away from the forward end 113 of the cutting head 102 and cooperate in a dovetail manner with a Sliding adjustment between them. Similar to the embodiment of the cutting tool 1 according to which the handle of the tool 4 has a design illustrated in Figure 4b, the cutting tool 101 may be provided with means for elastically securing the cutting head on the handle of the tool. . Figures 10, 11 and 13 show an alternative example of the securing means. The securing means comprise two cylindrical locking pins 220 (Figures 11 and 13) projecting axially from the central base surface 160 of the female attachment member 200 of the tool handle 104 and which are disposed adjacent the conical walls of the tool. fixing 154 thereof and two corresponding cylindrical locking receptacles 222 (Figures 10 and 13) formed in the conical fixing walls 128 of the male fastening member 200 of the cutting head 102 and adapted to receive the insurance pins therein. 220. The safety pins 220 are inclined towards the longitudinal axis 106 to be generally co-directed with the diverging conical walls 128 and 154 of the respective male and female fixing members 200 and 210. As can be seen in the Figure 13, the lock pins 220 are accommodated in the handle of the tool 104 in an elastic manner which, in the embodiment These are obtained by mounting each of the lock pins 220 in a stepped elongated hole 230 formed in the handle of the tool 104 adjacent to the conical fixing walls 154 thereof and having two orifice sections of different diameters. so that a lower portion 232 of the pin 220 fits in the lower narrow section 236 of the bore 230, and an upper section 240 of the pin 220 is surrounded by a wide upper section 242 of the bore 230, the pin can be bent slightly within it. . In this way, during the assembly of the cutting tool 101, the cutting head 102 is inserted into the cutting head receiving portion 142 of the tool handle 104 and rotated in the direction A, the conical fixing walls 128 of the male fastening member 200 slides under the conical fastening walls 154 of the female fastening member 210 and the pins 220 are tilted out towards the last walls 154. By splicing the torsion transmission walls 126 of the head coupling portions cutting machine 200 against the torsion transmission walls 152 of the tool handle freezing portions 44, rotation of the cutting head 102 ends and the locking pins 220 enter the safe receptacles 222. With this, the cutting head 102 it is reliably secured in its mounting position in the tool handle 104 by the elastic lock pins 220. The short tools The devices of the present invention can be additionally provided with an assembly device. Thus, Figures 14 and 15 illustrate two embodiments of the device that is used with any of the cutting tools described above and which will be described below with reference to cutting tool 101. As can be seen, the assembly device 300 (Figure 14) and 400 (Figure 15) each have an elongated cylindrical cavity 310, 410 and a diameter corresponding to the diameter of the cutting tool 101. The assembly devices 300 and 400, or at least their cavities 310 and 410 , are made of a suitable material and comprise a cutting head holding section 320, 420 and a receiving section of tool handle 330, 430, which are capable of covering or holding the cutting head 102 and the cutting head receiving portion 142 of the tool handle 104. The cutting head holding sections 320 and 420 of the cavities 310 and 410 have a complementary shape to an external configuration of the cutting head 102 and, consequently, comprise convex portions 340, 440 which are capable of entering the sections of burr folds of the cutting head, whereby the rotation thereof with respect to the devices of assembly 300 and 400 is avoided. The assembly devices 300 and 400 may additionally be provided with means for preventing the cutting head from falling out of the cutting head holding sections 320 and 420 of the devices. In this way, the assembly device 300 shown in Figure 14, these means are in the form of flexible elements 350 and, in the assembly device 400 shown in Figure 15, these means are constituted by the convex elements 440 formed with an appropriate shape and dimensions. Alternatively, or in addition to the above elements 350 and 440, the cutting head holding sections 320 and 420 of the cylindrical cavities 310 and 410 may have a diameter which is slightly smaller than that of the cutting head 102 to allow pressure fitting of the same in the corresponding cutting head holder section. When the cutting tool 101 is disassembled, the cutting head is released from the respective assembly device either by pushing it out of the device 300 at the rear end 360 thereof (Figure 14), or by pulling it out of the device 400 at the front end 460 thereof. . The cutting tool assembly of the present invention and the components thereof may have alternative designs that comprise features different from those previously described in the drawings. For example, the cutting tool can be formed with more than two burr evacuation folds or can obtain those folds at all or it can be provided with a locally formed burr evacuation space. In the latter case, the lowered surfaces of the cutting head and tool handle will occupy the entire area between their raised surfaces. In addition, the cutting head mounting portion and the cutting head receiving portion of the tool handle can be formed with more than two coupling portions which can be spaced equally or in different ways. Also, the design of the cutting head mounting portion and the cutting head receiving portion of the tool handle, as shown in the drawings, can be applied to these portions and vice versa. The insurance means used in the cutting tool can have any appropriate design. The cutting tool assembly can be provided with additional features such as, for example, cooling means.

LIST OF REFERRING NUMBERS 1 cutter tool assembly in Figures 1 to 8 2 cutter head 4 tool handle 6 longitudinal axis 8a, 10a burr crease sections of cutter head 8b, 10b burr crease sections of the handle of the tool 12 cutting position of the cutter head 13 front end of the cutting head 14 cutting head mounting portion 15 rear end of the cutting head 16 peripheral surface of the cutting head mounting portion 20 cutting head coupling portions 21 ', 21' 'points radially furthest from the sections of burr folds 8a and 10a 22 base surface lowered from the cutting head coupling portion 24 raised base surface of the cutting head coupling portion 26 torsion transmission wall of the cutting head coupling portion 27 rounded corner 28 fixing wall of the cutting head coupling portion 29 notch of the coupling portion of the cutting head 30 central base surface between the portions of head coupling 10 cutter 40 front face of the tool handle 42 cutting head receiving portion of the tool handle 43 peripheral surface of the cutting portion receiving tool cutting head of tool handle 44 parts of tool handle coupling elevated base surface portion Coupling of the tool handle 50 Base surface lowered from the coupling portion of the tool handle 25 52 Torsion transmission wall of the coupling portion of the tool handle 54 Fixing wall of the coupling portion of the tool tool handle 56 protruding from the coupling portion of the tool handle * 60 central base surface between the coupling portions of the tool handle 10 62 elastic groove 64, 66 male and female guide members 101 cutter tool assembly in Figures 9 to 13 102 cutting head 15 104 handle of the tool 106 longitudinal axis 106 112 cutting portion of the cutting head 113 front extr ee of the cutting head 114 mounting portion of the cutting head 115 rear end of the cutting head 120 coupling portion of the cutting head 122 base surface lowered from the cutting head coupling portion 124 124 raised base surface of the cutting head coupling portion 126 torsion transmission wall of the cutting head coupling portion 128 tapered retaining walls of male locking member 129 notch of the cutting head coupling portion 130 central base surface of the cutting member male fastening 140 front face of the tool handle 142 cutting head receiving pulley of the tool handle 144 engaging portion of the handle of the tool tool 148 elevated base surface of mating portion of tool handle 150 base surface lowered portion coupling of the tool handle 152 torsion transmission wall of the coupling portion of the tool handle 25 154 conical walls of the fixing member female attachment 160 central base surface of the female attachment member 156 protruding portions coupling tool handle 200 male fastening member of the cutting head 210 female fastening member of the tool handle 10 220 locking pins 222 locking receptacles 230 elongated holes 232 lower portion of the pin 220 236 lower narrow section of the hole 230 240 upper section of the pin 220 242 wide upper section of the hole 230 246 cylindrical depression formed in the peripheral walls 152 20 300 assembly device shown in Figure 14 310 cavity of assembly device 300 320 section of cutting head holder of assembly device 300 25 330 section of reception of tool handle of assembly device 300 340 convex portions of device of assembly 300 350 flexible elements of the assembly device 300 360 rear end of the assembly device 300 400 assembly device shown in the Figure 15 410 cavity of the assembly device 400 420 cutting head holder section of the assembly device 400 430 reception section of the tool handle of the assembly device 400 440 convex portions of the assembly device 400 460 front end of the device assembly 400

Claims (23)

1. CLAIMS 1. A cutting tool assembly for rotary cutting operations characterized in that it comprises a replaceable cutting head and a tool handle, having a common longitudinal sje and peripheral coupling surfaces; the cutting head has a cutting portion adjacent a leading end and a cutting head mounting portion adjacent a trailing end thereof, and the tool handle has a cutting head receiving portion formed on a front face thereof , the cutting head mounting portion and the cutting head receiving portion of the tool handle each have at least two coupling portions, the cutting head coupling portions and the coupling portions of the tool handle are they unite by the peripheral surface * and have stepped configurations that fit in shape and dimensions; each coupling portion has a pair of base surfaces of which one surface is raised and the other is lowered, the base surfaces extend transversely to the longitudinal axis on at least the lowered surface of each coupled portion of the cutting head and the raised surface of each engaging portion of the tool handle being adapted to provide "the axial support of the cutting head in the tool handle, a torsion transmission wall extends from a corresponding peripheral surface in a generally radial direction in relation to the longitudinal axis and separating and being oriented transversely to the raised and lowered base surfaces, and a fixing wall disposed adjacent and extending transversely to the torsion transmission wall and circumferentially relative to the longitudinal axis, the fixing wall of Each portion of cutting head coupling it is inclined towards the longitudinal axis in the direction of the leading end of the cutting head and having an angular extension smaller than a corresponding angular distance between the adjacent ends of the fixing walls of two different tool handle coupling portions; the cutting tool is initially assembled by placing the cutting head mounting portion in the manner relative to the cutting head receiving portion for inserting the fixing walls of the head-cutting coupling portions between the respective fixing walls of the cutting heads. coupling portions of the tool handle, and subsequently rotating the cutting head relative to the tool handle until the cutting head coupling portions are fully underlying the coupling portions of the corresponding tool handle with their base surfaces and its torsion-transmitting walls "spliced one on top of the other and their fastening walls interact • co-axially in a male-female interlocked manner, thereby providing self-clamping of the cutter head on the handle of the tool. The cutting tool assembly in accordance with the claim 1, characterized in that at least the "lowered base surface of each coupling portion of the cutting head and the raised base surface portion of each engagement portion of the tool handle are radially and substantially co-extended with the torsion transmission wall. 3. The cutting tool assembly according to claim 1, characterized in that the base base surfaces of the cutting head coupling portion belong to notches formed in the rear end of the cutting head, and the high base surfaces of the coupling portions of the tool handle belong to projections formed on the front face of the tool handle, the depth of the notches and the height of the projection are defined with the axial extension of the torsion transmission wall, whose extension is substantially smaller than the radial extension of the torsion transmission wall. 4. The cutting tool according to claim 1, characterized in that the handle of the tool is formed with at least two folds of burr. The cutting tool assembly according to claim 4, characterized in that the cutting head is formed with sections of burr folds which are continuously joined with the flaring folds formed in the tool handle. The cutting tool according to claim 5, characterized in that each coupling portion extends between the two folds in such a way that its lowered surface is arranged adjacent to one of the folds and its raised surface is disposed adjacent the other fold. The cutting tool assembly according to claim 3, characterized in that the handle of the tool is formed with burr folds and the cutter head is formed with sections of burr folds which are continuously joined with the formed burr folds. in the handle of the tool, the notches and projections of the respective cutting head coupling portions and the coupling projections of the tool handle are each joined on one of their sides by an adjacent fold in their another side, by the torsion transmission wall. 8. The cutting tool according to any of claims 1 to 7, characterized in that it is adapted to be used in rotation operations. The cutting tool according to claim 8, characterized in that it is adapted for use in drilling operations. 10. A replaceable cutting head that can be mounted on a tool handle along a longitudinal axis thereof, the tool handle has a front cutting head receiving portion formed with at least two coupling portions, each joined by a peripheral surface of tool handle; the cutting head characterized in that it has a peripheral surface that engages with the peripheral surface of the tool handle, a cutting portion "adjacent to an anterior end and a cutting head mounting portion adjacent a rear end thereof, the cutting head mounting portion is formed with at least two coupling portions joined by the peripheral surfaces of the cutting head and having a stepped configuration; each coupling portion has a pair of base surfaces of which one surface is raised and the other is lowered, the base surfaces extend transversely to the longitudinal axis and at least the lowered surface is adapted to provide an axial support of the cutting head in the tool handle, a torsion transmission wall extends from a corresponding peripheral surface in a generally radial direction relative to the longitudinal axis and separating and being oriented transversely to the base surfaces, and a fixing wall . adjacent spaced apart and transversely extending to the torsion transmission wall and circumferentially relative to the longitudinal axis, the fixing wall of each cutting head coupling torsion is inclined towards the longitudinal axis in the direction of the leading end of the cutting head and having an angular extension smaller than a corresponding angular distance between the adjacent ends of the fastening walls of two different tool handle coupling portions. The cutting head according to claim 10, characterized in that at least the lowered base surface of each coupling portion of the cutting head is radiically and substantially co-extended with each torsion transmission wall. 12. The cutting head according to claim 10, characterized in that the body of the cutting head is solid. The cutting head according to claim 10, characterized in that the base surface lowered and the fixing wall of each coupling portion of the cutting head are substantially equidistant from the longitudinal axis. The cutting head according to claim 10, characterized in that the base-lowered surfaces of the cutting head coupling portion belong to the notches formed in the rear end of the cutting head, the depth of the notches is defined by the axial extension of the torsion transmission wall, whose extension is substantially smaller than the radial extension of the torsion transmission wall. The cutter head according to claim 10, characterized in that the cutting head is formed with sections of burr folds which are continuously joined with the flaring folds formed in the tool handle. The cutting head according to claim 15, characterized in that the notches of the cutting head coupling portions, each one is joined on one of its sides, by an adjacent fold, and on the other side, by the wall of the cutting head. torsion transmission. The cutting head according to claim 10, characterized in that the cutting head is formed with sections of burr folds, at least one of the coupling portions extends between two sections of burr folds adjacent to the base surface lowering thereof being disposed adjacent one of the burr pleat sections and the raised base surface thereof being disposed adjacent the other burr fold section. The cutting head according to claim 10, further formed with a fixing member extending axially from the base surfaces thereof, and the fixing walls of the coupling portions of the cutting head are constituted by surfaces peripherals of the fixation members. The cutting head according to claim 17, characterized in that the fixing and torsion transmission walls of each coupling portion are part of a substantially continuous step oriented transversely to the base surfaces and that extend from one of the folds to the peripheral surface of the coupling portion. 20. The cutting head according to claim 10, characterized in that the torsion transmission wall is obliquely inclined to the base surfaces. 21. The cutting head according to claim 1, characterized in that it also comprises a device for assembly and disassembly, the device comprises an elongated cylindrical cavity of a diameter that corresponds to the diameter of the cutting tool, at least the cavity is made of an elastic material, the cavity comprises a cutting head holding section and a tool handle receiving section, the sections of which are capable of elastically covering the cutting head and the cutting head receiving portion of the tool handle, the section The cutting head holder has the complementary shape to an outer configuration of the cutting head, whereby the rotation thereof with respect to the assembly device is avoided, and being provided with means to prevent the cutting head from falling out of the section. cutting head holder of the assembly device. The cutting tool assembly according to claim 1, characterized in that the fixing walls of the coupling portions of the tool handle and the cutting head are designed to have an interference fit with each other. 23. The cutting tool assembly according to claim 22, characterized in that the interference fit is achieved by forming the handle of the tool with an elastic slit. The cutting tool assembly according to claim 1, characterized in that the cutting head and the handle of the tool are formed with coupling fixing members extending axially from the base surface thereof, and the fixing walls. of the coupling portions are constituted by peripheral surfaces of the fixing members. 25. The cutting tool assembly according to claim 1, characterized in that the base surface lowered from each engaging portion of the cutting head, the raised base surface of each engaging portion of the tool handle and its mounting walls. associated fixation * are substantially equidistant from the longitudinal axis. 26. The cutting tool assembly according to claim 5, characterized in that the fixing and torsion transmission walls of each coupling portion are part of a substantially continuous step oriented transversely to the base surfaces and extending from one of the folds to the peripheral surface of the coupling portion.