BE1025743B1 - TOOLING FOR CUTTING A GROOVE OR OTHER INNER PROFILE IN A HOLE OR IN A HOLE BORGNE - Google Patents

Abstract

Tools for cutting a groove or other internal profile in a through hole or in a blind hole, the tool (1) comprising a knife holder (2) and a knife (4) mounted in a housing ( 3) of the knife holder (2), as well as a guide piece (9) fixed on the knife holder (2), characterized in that the housing (3) of the knife (4) is made in a lower end of the knife holder (2) and that the bottom (15) of the guide piece (9) does not exceed the bottom (14) of the knife holder (2) in the axial direction (X-X ').

Description

Tools for cutting a groove or other interior profile in a through hole or in a blind hole.

The invention relates to a tool for cutting a groove or other internal profile in a through hole or in a blind hole.

By blind hole is understood a hole of which only one of the ends is completely open.

By passing hole means a hole whose two ends are completely open.

GB 858,499 describes a tool for cutting grooves and other interior profiles in a hole passing from a workpiece.

This tool includes a knife mounted in a knife holder in the form of a rod and a guide piece mounted with a certain eccentricity on the lower end of the knife holder.

The knife protrudes with its cutting part out of a side face of the tool.

The tooling is intended to be mounted on a machine for the execution of wedge grooves such as staplers or mortising machines by an alternating axial passage of the knife through the hole to remove material from the wall of the hole step by step. form a groove for example. The

B E2017 / 5890 guide piece allows the tooling to be guided in the hole during axial movement in the hole of the workpiece.

A disadvantage of such a tool according to GB 858,499 is that it is not possible to position the guide piece on the knife holder precisely.

Not knowing how to position this part precisely causes errors not only in terms of precision but also in the shape of the grooves or other profiles executed. The length of the guide piece under the knife also limits the possibility of use in blind holes.

The present invention is an improvement of a tool according to patent GB 858.499, allowing on the one hand, the execution of any interior profile in bores with increased precision and on the other hand the execution of any interior profile in blind holes.

This object is achieved according to the invention by a tool for cutting a groove or other internal profile in a through hole or in a blind hole, the tool comprising a knife holder and a knife mounted in a housing. of the knife holder, as well as a guide piece fixed on the knife holder, characterized in that the knife housing is formed in a lower end of the knife holder and that the bottom of the guide piece does not exceed the bottom of the knife holder in axial direction.

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Therefore, the knife holder can descend as far as possible into the bottom of a blind hole without being hindered by the presence of the guide piece below the knife holder.

The knife housing is delimited by a bottom wall of the knife holder, the thickness of which is preferably made as thin as possible.

In this way the knife can descend as deep as possible into a blind hole to make a groove or other interior profile.

The tool preferably includes a housing for a male positioning lug extending into a female notch of the guide piece, to prevent rotation of the guide piece on the knife holder and to position the guide piece with high precision on the knife holder.

Advantageously, the male positioning lug and its housing are directed in the transverse direction parallel to the transverse axis of the knife housing.

Therefore, the machining of the internal profile of the knife housing can be carried out in a single operation with the machining of the housing of the positioning lug and thus makes it possible to achieve perfect precision of perfect positioning.

Preferably, the female notch of the part

B E2017 / 5890 guide extends in axial direction and over the entire height of the guide piece.

This facilitates precise execution of the notch and simultaneous machining with the bore of the guide piece to achieve perfect positioning precision.

This tool can be used on any manual machine or

automatic standard or developed specially for 1'exécution grooves of wedges such only stewers or mortisers. For more clarity, a example of production a

tool according to the invention for cutting a groove or other internal profile in a through hole or in a blind hole is described below by way of illustration and not restrictively, reference being made to the appended drawings in which:

Figure 1 is a perspective view of a tool according to the invention but without knife;

Figure 2 and Figure 3 show the tool of Figure 1 in a disassembled state and from two different points of view;

the figure 4 watch the room indicated through F4 in the Figure 3; the figure 5 watch the room indicated through F5 in the Figure 3; the figure 6 is a cut Ion la 1 i gne VI- VI of the

Figure 4, but with a knife mounted.

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In Figure 1 a tool 1 is shown according to one invention.

The tool 1 comprises a knife holder 2 to be mounted on a machining machine capable of moving the tool in the longitudinal direction XX 'of the knife holder 2.

The knife holder 2 is provided with an inner radial housing 10 which is profiled 3 for positioning a knife 4, shown only in FIG. 6.

The knife 4 comprises a cutting part 5 which protrudes with a certain length from the outer wall 6 of the knife holder 2, in particular from a side face 6 of this outer wall.

The housing 3 extends in the transverse direction YY 'and at the same time serves to guide the knife 4 in the transverse direction so that the knife 4 can be positioned gradually farther and farther from the axis XX' in order to remove from the material of the workpiece each time the tool passes through the hole.

The knife holder 2 comprises a stop collar 7 with support surfaces 8 which make it possible to fix a guide piece 9 by means of assembly screws 10 or other fixing means, the screws 10 being able to be referred to in a thread 11 provided in the guide piece 9.

The neck 7 can, depending on the tools, be located at 6

B E2017 / 5890 above or below the guide piece 9.

The assembly screws 10 can be mounted above or below the guide piece 9 depending on the size of the tool 1. The thread 11 can therefore either be made in the knife holder 2 or in the piece guide

9.

The figures show an example of a top mounting.

Alternatively, the bearing surface 8 can be produced by a shoulder of the knife holder 2, produced by the fact that the upper part of the knife holder 2 has a diameter larger than the diameter of the lower part, thus forming a stop for the guide piece 9. The guide piece 9 is in the form of a ring with a through bore 12 with which the guide piece 9 is closely positioned without play around the lower part of the knife holder 2 at the height of housing 3 20 for knife 4.

The guide piece 9 includes a lateral opening so as not to cover the housing 3 of the knife 4.

The tooling is designed in such a way that in the situation assembled in FIG. 1, the bottom 15 of the guide piece 9 does not exceed the bottom 14 of the knife holder 2 in the axial direction XX 'and that preferably the bottom 14 and the bottom 15 of the two parts 2 and 9 are located 30 in the same plane perpendicular to the longitudinal axis XX 'of the knife holder 2. In the example of the figures this is

B E2017 / 5890 achieved by the fact that the neck 7 is located at an axial distance A from the bottom 14 of the knife holder 2 which is equal to the height B of the guide piece 9.

The thickness C of the bottom wall 16 of the knife holder 2 which delimits the housing 3 of the knife 4 is made as thin as possible so that the knife 4 can descend as deep as possible into a blind hole.

The knife holder 2 comprises a housing 17 for a male positioning lug 18 which extends radially as far as in a female notch 19 of the guide piece 9.

The male positioning lug 18 and its housing 17 are directed in the transverse direction Y-Y 'parallel to the transverse axis Y-Y' of the housing 3 of the knife 4 and therefore parallel to the guide direction of the knife 4.

Therefore, the machining of the interior profile of the housing 3 of the knife 4 is done in a single operation with the machining of the housing 17 of the positioning lug 18 and makes it possible to achieve perfect positioning precision.

The housing 17 of the positioning lug 18 is preferably located in the bottom wall 16 of the knife holder 2, but could also be machined above the housing 3 of the knife 4 or in the side walls of the housing 17.

The male positioning lug 18 is removable, which allows it to be replaced in the event of damage or wear.

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The position of the positioning lug 18 can be freely chosen as a function of the size of the tool and the practical methods of construction of this same tool.

The female notch is located in the internal diameter of the bore 12 of the guide piece 9 and extends in the longitudinal direction XX 'and over its entire height B of the guide piece 9 to facilitate the precise execution of that -this and the simultaneous machining with the bore 12 of the guide piece 9 to achieve perfect positioning precision.

The guide piece 9 can be lightened by machining cavities 20.

Unlike GB 858,499 the guide piece 9 does not have a closed bottom, the bore 12 being through, and can have a cylindrical profile or any other profile on its outside diameter, which corresponds at least in part with the profile of the diameter inside the hole of the workpiece for perfect guidance.

In the figures by way of example, the guide piece 9 is offset relative to the axis XX 'of the knife holder 2.

The fact that the guide piece 9 does not have a closed bottom makes it possible to use the tool 1 in pass-through and blind holes because, unlike patent GB 858,499, the thickness C is reduced to a minimum.

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The assembly of the knife holder 2 and the guide piece 9 is therefore performed without play and with perfect positioning due to the precision of the machining and of the positioning by the precision lug 18.

It is obvious that the invention is in no way limited to the example described above but that numerous modifications can be made to the tool described above without departing from the scope of the invention as defined in the following claims.

Claims (12)

Claims. 1.- Tools for cutting a groove or another 5 inner profile in a through hole or in a blind hole, the tool (1) comprising a knife holder ( 2) and a knife (4) mounted in a housing (3) of the knife holder (2), as well as a guide piece (9) fixed on the knife holder (2), characterized in that the housing (3) knife (4) is made in a lower end of the knife holder (2) and that the background (15) of the room of guide (9) does not exceed not the background (14) of knife-rest (2) in axial direction (X-X '). 15 2.- Tools according to claim lz characterized in this that the guide piece (9) is in the form of a ring with a lateral opening (13) and a through bore (12) which envelops the said end of the knife holder (2) with the housing (3) for the knife (4), 20 while leaving a passage for the knife (4) through the lateral opening (13). 3.- Tool according to claim 1 or 2, characterized in that the knife holder (2) has a neck (7) with a bearing surface (8) which allows the guide piece (9) to be fixed by by means of assembly screws (10) or other fixing means. B E2017 / 5890 4. - Tool according to any one of the preceding claims, characterized in that the bottom (15) of the guide piece (9) and the bottom (14) of the knife holder (2) are 5 located in the same plane perpendicular to the axis (X-X ') of the knife holder (2) in the assembled state of the tooling. 5. - Tool according to claim 4, characterized in that the neck (7) is located at an axial distance (A) from the bottom 10 (14) of the knife holder (2) which is equal to the height (B) of the guide piece (9). 6. - Tool according to any one of the preceding claims, characterized in that the knife holder (2) 15 comprises a housing (17) for a male positioning lug (18) extending into a female notch (19) of the guide piece (9). 7. - Tool according to claim 6, characterized in that 20 that the male positioning lug (18) and its housing (17) are directed in the transverse direction (Y-Y ') parallel to the transverse axis (Y-Y') of the housing (3) of the knife (4 ). 25 8.- Tool according to claim 7, characterized in that the housing (3) of the knife (4) is delimited by a bottom wall (16) of the knife holder (2) and that the thickness (C) of this bottom wall (16) is made as thin as possible. 9.- Tool according to claim 8, characterized in that B E2017 / 5890 that the housing (17) of the positioning lug (18) is located in the bottom wall (16) of the knife holder (2). 10. - Tool according to any one of claims 7 to 9, characterized in that the male positioning lug (18) is removable. 11. - Tool according to any one of claims 6 to 10, characterized in that the female notch (19) of the guide piece (9) extends in the axial direction (X-X ') and over the entire height (B) of the guide piece (9). 12. - Tool according to any one of the preceding claims, characterized in that the guide piece (9) is provided with cavities (20).