Manual deburring tool

Abstract

The invention relates to manual deburring tool (1) comprising: - a consumable carbide plate (10) having deburring edges (12), and - a casing (20) which is configured to be grasped manually and has an internal cavity (22) for housing the plate, the casing (20) comprising a body (25) and a cover (27) removably attached to the body so as to allow the insertion of the plate (10) into the cavity (22) and the removal of said plate from the cavity, the housing comprising at least one opening (26) that opens into the cavity and exposes a deburring edge (12).

Description

[0001]DESCRIPTION TITLE: MANUAL DEBURRING TOOL Technical field of the invention The invention relates to the technical field of manual tools for deburring and adjusting workpiece surfaces, for example by deburring or corner breaking. Technical background The technical background includes in particular documents CH-A-479358, US-A1- 2018 / 250843, US-A1-2021 / 213544 and US-A1-5054201. The finishing of workpieces, in particular raw metal workpieces, involves manual adjustment operations, including deburring, deburring or corner breaking or corner breaking. Deburring is an operation during which excess metal or burrs present on a workpiece are removed. This type of defect can particularly appear on a part after machining operations such as milling or turning.Deburring is an operation aimed at removing unwanted protrusions from the surface of a part, while corner breaking aims to eliminate cutting edges. Until now, during manual part adjustment operations, the journeyman uses a carbide insert to remove the burr from a previous operation. However, the use of carbide inserts as is has proven unsuitable for both the journeyman and the part on which the finishing operations are carried out. Indeed, the journeyman is exposed to a risk of cuts during the use of the insert and there is a risk of shocks and scratches on the part impacting the quality of the part and the delivery time. In addition, without appropriate tools, the journeyman may be required to use other tools not validated in the tooling reference, which results in non-compliance with quality rules.This applies particularly to the manufacture of parts in the aeronautics field, such as for example the manufacture of parts for turbomachines. Indeed, the parts of turbomachines can have large dimensions and the manual adjustment operations of these parts can be long and delicate. The invention aims to provide a manual tool for deburring and adjusting the surfaces of parts making it possible to avoid damage to the part, the risk of cutting the companion and the consequences of such situations.Summary of the invention The invention provides for this purpose a manual deburring tool, this tool comprising: – a consumable carbide insert, this insert having deburring edges, and – a housing which is configured to be gripped manually and which comprises an internal cavity for housing the insert, this housing comprising a body and a cover removably fixed on the body so as to allow the insertion of the insert into the cavity and the removal of the insert from the cavity, the housing comprising at least one opening opening into the cavity and exposing a deburring edge of the insert. When the worker uses the manual tool according to the invention, he is no longer in direct contact with the carbide insert but with the housing. Indeed, when the housing is closed, that is to say when the cover is closed, only the or each deburring edge of the carbide insert is exposed through the openings.Thus, the housing provides protection to the worker who no longer directly grips the carbide insert but grips the housing containing this insert. In addition, the risk of impact with a surface of the part to be finished is considerably reduced since only the deburring edges of the insert remain exposed.According to various characteristics of the invention which may be taken together or separately: - the tool comprises several openings; - the openings have a depth of between 2 mm and 8 mm; - the openings have dimensions smaller than the dimensions of the insert other than a thickness of the insert; - the cavity has dimensions adjusted to the dimensions of the insert; - the body comprises two guides, the cover comprising two lateral longitudinal edges capable of cooperating with the guides by a sliding connection; - the housing comprises a recess capable of cooperating with a lug of the cover; - the housing is made of a plastic material having a breaking strength of between 35 J / m. 2 and 52 J / m 2 , preferably between 44 J / m 2 and 48 J / m 2; - the external face of the housing comprises a knurling defining a plastic structure having an arithmetic mean roughness of between 0.2 and 0.3 µm; The invention further relates to a method for deburring a part using a manual tool as previously described, said part comprising an edge at which there is a burr, the method comprising the following steps: - bringing one of the edges of the plate into contact with the edge through one of the openings, and - moving the edge of the plate along the edge into contact with the edge. Advantageously, the part is a part of an aircraft turbomachine, and in particular a rotor drum. Brief description of the figures Other objects, characteristics and advantages of the invention will appear more clearly in the description which follows, given with reference to the appended figures, in which: - figure 1 illustrates a perspective view of a manual deburring tool according to an example ofembodiment of the present invention; - Figure 2 illustrates an example of a carbide insert for a manual deburring tool according to an exemplary embodiment of the present invention; - Figure 3 illustrates a side view of a part to be finished by means of the manual deburring tool according to the invention; - Figure 4a is a cross-section of the housing of the manual deburring tool according to an exemplary embodiment of the present invention; - Figure 4b is a side view of the housing of the manual deburring tool according to an exemplary embodiment of the present invention; - Figure 5 illustrates a top view (without the cover) of the housing of the manual deburring tool according to an exemplary embodiment of the present invention; - Figure 6a is a side view of the cover of the manual deburring tool according to an exemplary embodiment of the present invention; - Figure 6b is a cross-section of the cover of the manual deburring tool according to an exemplary embodimentof the present invention; - Figure 6c is a top view of the cover of the manual deburring tool according to an exemplary embodiment of the present invention. Detailed description of the invention With reference to Figure 1, the invention relates to a manual tool 1 for deburring and adjusting the surface of a part P. A definition of deburring is mentioned in the preamble to this description and is not repeated here. Surface adjustment designates any operation aimed at modifying the surface of the part, including deburring or even angle breaking, the definitions of which are also given in the preamble to this description. The manual tool 1 comprises a consumable carbide insert 10 having deburring edges 12. These allow any finishing operation to be carried out such as the operations seen in the above. Figure 3 illustrates how the finishing of the part can be carried out by means of the hand tool 1. The insert 10 incarbide is a consumable and can therefore be changed after wear or deterioration, for example because its deburring edges are worn. Preferably, the carbide insert 10 is a silicon carbide insert. The insert 10 has for example a general shape of a truncated pyramid so that its deburring edges 12 are inclined. In this exemplary embodiment, a base of the truncated pyramid corresponds to a lower face of the insert while a plane at which the pyramid is truncated corresponds to an upper face of the insert. It should be noted that the terms "lower", "upper" are not limiting in the context of the present invention, and are only used to describe the invention with reference to the exemplary embodiments illustrated in the figures. Preferably, the lower face of the insert is preferably the one which is opposite a bottom of a cavity of the hand tool 1. As can be seen in the figure, the edgesdeburring tools 12 are more precisely inclined outwards from the upper face towards the lower face. We will return to this later. In the example shown in Figure 3, the part P is a rotor of an aircraft turbomachine and more particularly a rotor drum which is here partially shown in axial section. Conventionally, this drum has a generally annular shape around an axis and comprises discs D connected to each other by an annular web V. The disc comprises at its external periphery cells AL for mounting blade roots and the web comprises annular wipers L extending radially outwards. The hand tool 1 is used to remove the burrs located at the edges A or to break the angle of the edges located for example in the areas where the web is connected to the discs as illustrated in the drawing. The hand tool 1 further comprises a housing 20 which is configured to be gripped manually. The housing 20includes an internal cavity 22 for housing a carbide insert 10. According to an exemplary embodiment of the present invention, the cavity 22 has dimensions adjusted to the dimensions of the carbide insert 10 so that there is little or no clearance between the insert 10 and the cavity 22. When there is no clearance between the insert 10 and the cavity 22, the insert 10 is held fixedly or immobile in the cavity 22. The housing 20 further comprises a body 25 and a cover 27 removably attached to the body so as to allow the insertion of the carbide insert 10 into the cavity 22 and the removal of the carbide insert 10 from the cavity 22. According to the invention, the housing 20 comprises at least one opening 26 (visible in FIG. 4b) opening into the cavity 22 and exposing a deburring edge 12 of the carbide insert. That being said, the housing advantageously includes several openings 26, which allows more exposure of the deburring edges.of the wafer. As mentioned previously, the deburring edges 12 are inclined outwardly from the upper face to the lower face, so that when the wafer 10 is in a cavity 22 with its lower face in contact with the bottom of the cavity 22, the deburring edges 12 are closer to the openings 26 than the other parts of the wafer 10. In the exemplary embodiment illustrated in Figures 1 and 5, the body 25 is of parallelepiped shape. The cavity 22 may be positioned so that one or more of its side faces are adjacent to one or more side walls 21a, 21b, 21c, 21d of the body 25 or located at one or more side walls 21a, 21b, 21c, 21d of the body 25. By modifying the distance separating the side faces of the cavity from the side walls 21a, 21b, 21c, 21d of the body, which respectively face them, it is possible to modify the depth of the openings 26. The depth of aopening corresponds in fact to the distance separating the lateral face of the cavity where the opening is located from an external face of the side wall of the body where said opening opens. Each lateral face of the cavity defines an internal face of the housing while for each side wall of the body, the external face corresponds to an external face of the housing. Preferably, the openings 26 have a depth of between 2 mm and 8 mm. A minimum depth of 2 mm generates sufficient withdrawal of the deburring edges 12 relative to an external surface of the housing. At the same time, this also means that the wall thickness is 2 mm which also makes it possible to guarantee good mechanical strength of the housing 20. A depth of at most 8 mm makes it possible to keep a hand tool 1 of appropriate dimensions so that it can be handled while guaranteeing access to the deburring edge 12. Indeed, the greater the depth of the openings 26, the more the otherThe larger the dimensions of the openings 26, the less easily the hand tool 1 according to the invention can be handled. In the proposed embodiment, the tool 1 comprises several openings 26. However, this is not necessary and it is not outside the scope of the invention when the tool only comprises one opening. Nevertheless, when the tool comprises several openings, it is possible to position the tool optimally relative to the surface of the object to be treated by the tool. Furthermore, having several openings reduces the need to move the insert once the first edge thereof has been worn through use, all the edges of the insert opposite an opening then being worn during use. For example, an opening may be arranged on three of the four edges of the housing of the tool 1. The openings 26 advantageously have dimensions smaller thandimensions of the carbide insert 10 other than the thickness of said carbide insert, which makes it possible to prevent the insert 10 from coming out of the housing after insertion into the cavity. In particular, the openings 26 have a width and a length less than the length and width of the insert 10. Still according to the exemplary embodiment of FIG. 1, the cavity 22 for housing the insert comprises an access 23 extending transversely relative to the side walls of the cavity and through which the insert 10 can be inserted. That being said, as an alternative, it would also be possible to use a slot allowing the lateral insertion of the carbide insert 10. This solution remains less interesting because it would require additional means for closing the cavity 22. The access 23 is closed by means of the cover 27. In FIG. 1, the cover 27 is positioned appropriately for insertion of the insert 10 into the cavity 22.That being said, the position of the cover 27 may vary. In this regard, the body 25 comprises two guides 28a, 28b with which longitudinal edges 27a, 27b of the cover are able to cooperate. In the exemplary embodiment illustrated in FIG. 4a, the guides 28a, 28b are in the form of recesses, of parallelepiped shape, made in the side walls 21b, 21d of the housing. As can be better seen in Figure 1, the guides 28a, 28b are formed along the edges of the side walls 21b and 21d and of the access 23. The cover 27 thus forms a sliding connection with the body 25 allowing it to pass from a proximal position in which it completely covers the cavity 22, and therefore closes the housing 20, to a distal position in which the access 23 is completely clear, the housing 20 then being open, passing through successive intermediate positions. When the cover 27 completely covers the cavity 22, the deburring edges 12 arethe only parts of the insert 10 which are exposed, as previously indicated, through the openings 26. Thus, the risks of cutting the companion and damaging the part to be finished are greatly reduced, or even eliminated by using the hand tool 1 according to the invention. Indeed, the surface handled by the companion is a surface protected by the housing 20. Furthermore, if the hand tool 1 comes into contact with another surface of the part when the finishing operations are carried out, it is with a surface protected by the housing 20 since the latter covers the majority of the insert 10. As previously mentioned, the openings 26 can have a depth of between 2 mm and 8 mm so that the deburring edges 12 are set back from the outer surface of the housing 20. Figure 5 illustrates in more detail the arrangement of the cavity 22 and the other elements located inside the housing 20. As alreadyindicated previously, in the illustrated embodiment, the cavity 22 is located in the immediate vicinity of one or more of the side walls 21a, 21b, 21c, 21d. In the present case, it is located in the immediate vicinity of the side walls 21a, 21b and 21d. It comprises a bottom 220 on which the carbide insert 10 rests. On the right-hand part of the housing as illustrated in FIG. 5, a solid portion 24 adjoins the cavity 22. The solid portion 24 comprises a recess 24a in which a lug 27c located on the face of the cover 27 facing the inside of the housing 20 is intended to be housed. An example of the arrangement of the lug 27c relative to the cover is illustrated in FIGS. 6a and 6b. Such an arrangement makes it possible to limit the movement of the cover 27, or even to lock the cover 27 relative to the housing 20. The locking takes place once the cover is in the proximal position, that is to say when it completely closes the cavity 22. The lockingmakes the tool even easier to use because it is ensured that, whatever the position of the tool, the cover is not reopened during use. Referring now to Figure 6c, the cover 27 may also include an opening 27d allowing the operator to grasp the cover 27 and slide it along the guides 28a, 28b. As can be better understood from Figure 1, when the cover is in the proximal position and closes the cavity 22, the opening 27d is positioned so as to face the solid portion 24, which allows the companion to grasp the cover in a simple and secure manner. Advantageously, the housing 20 is made of a plastic material having a breaking strength of between 35 J / m 2 and 52 J / m 2 , preferably between 44 J / m 2 and 48 J / m 2. This gives the housing more robustness and limits its wear. Such resistance to breaking is for example obtained with the gray Xtreme ® plastic from ACCURA. Other plastic materials having a resistance to breaking in the aforementioned range can also be used. It should be noted that advantageously, the gray Xtreme ® from ACCURA can be used in additive manufacturing processes. Thus, the housing 20 of the hand tool 1 according to the invention can be manufactured by additive manufacturing. Other plastic materials usable in additive manufacturing or in traditional manufacturing and having a resistance to breaking as mentioned above are available to those skilled in the art. As illustrated in the figures, the housing 20 can be produced by knurling type machining defining the plastic structure 29 having an arithmetic mean roughness of between 0.2 and 0.3 µm.Knurling is understood here as an alternation of hollows and bumps, and the arithmetic roughness of the knurling is defined as the characteristic depth, that is to say the difference between the top of a bump and the bottom of a hollow. The increase in the roughness of the surface of the housing 20 provided by the knurling makes it possible to give it non-slip properties. This improves the grip of the hand tool by the worker while avoiding the risk of cutting. Indeed, the adhesion between the personal protective equipment worn by the worker and the housing 20 is improved since the coating is non-slip. A method of deburring a part using a hand tool 1 as described above is described in the following. A part P is provided comprising an edge A at the level of which there is a burr resulting from a prior step of turning or milling the part.The method comprises a step during which one of the edges of the carbide insert is brought into contact with the edge A through one of the openings 26, then another step during which the edge of the insert is moved along the edge in contact with the edge. Thus, friction or sliding is exerted on the edge A with one of the deburring edges 12 of the manual tool 1 so as to remove the burr. The use of the manual tool according to the invention is therefore both simple and safe for the worker. The configurations shown in the figures cited are only possible examples, in no way limiting, of the invention which, on the contrary, encompasses the variants of shapes and designs within the reach of those skilled in the art.

Claims

CLAIMS 1. A hand-held deburring tool (1), said tool comprising: – a consumable carbide insert (10), said insert having deburring edges (12), and – a housing (20) which is configured to be gripped manually and which comprises an internal cavity (22) for housing the insert, said housing (20) comprising a body (25) and a cover (27) removably attached to the body so as to allow the insertion of the insert (10) into the cavity (22) and the removal of the insert from the cavity, the housing comprising at least one opening (26) opening into the cavity and exposing a deburring edge (12) of the insert.

2. A hand-held tool (1) according to claim 1, wherein the openings (26) have a depth of between 2 mm and 8 mm.

3. Hand tool (1) according to any one of claims 1 to 2, wherein the openings (26) have dimensions smaller than the dimensions of the insert (10) other than a thickness of said insert. 4.

5. Hand tool (1) according to any one of the preceding claims, wherein the cavity (22) has dimensions adjusted to the dimensions of the insert (10).

5. Hand tool (1) according to claim 4, wherein the body (25) comprises two guides (28a, 28b), the cover (27) comprising two lateral longitudinal edges (27a, 27b) capable of cooperating with the guides (28a, 28b) by a sliding connection.

6. Hand tool (1) according to any one of claims 4 to 5, wherein the housing (20) comprises a recess (24a) capable of cooperating with a lug (27c) of the cover.

7. Hand tool (1) according to any one of the preceding claims, wherein the housing (20) is made of a plastic material having a breaking strength of between 35 J / m. 2 and 52 J / m 2 , preferably between 44 J / m 2 and 48 J / m 2.

8. Hand tool (1) according to any one of the preceding claims, in which the external face of the housing (20) comprises a knurling defining a plastic structure (29) having an arithmetic mean roughness of between 0.2 and 0.3 µm.

9. Method for deburring a part using a manual tool (1) according to one of the preceding claims, said part (P) comprising an edge (A) at the level of which there is a burr, the method comprising the following steps: - bringing one of the edges of the plate (10) into contact with the edge (A) through one of the openings (26), and - moving the edge of the plate along the edge in contact with the edge.

10. Method according to the preceding claim, in which the part is a part of an aircraft turbomachine, and in particular a rotor drum (P).

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