LU82780A1 - DEVICE FOR MICROMETRIC ADJUSTMENT OF A CUTTING INSERT FIXED BY SCREW ON A SUPPORT - Google Patents

Description

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Certain known devices for fixing a cutting insert to the body of a tool holder comprise a conical head screw which bears on the cutting insert, the body of the tool holder being provided with a housing with a bottom. and two ledges.

5 By screwing the screw into the body of the tool holder, the plate is pressed against the bottom of the housing and against the two edges of the latter, thanks to an eccentricity of the thread of the body of the tool holder relative to the axis of the hole in the plate to be fixed.

These devices do not allow any adjustment of the position of the plate relative to its support. However, it turned out that a possibility of adjustment could be of interest in particular for making fine or micrometric adjustments.

. The invention relates to a simple device for performing such adjustments.

15 To this end, it relates to a device for micrometric adjustment of a cutting insert fixed in the housing of a support comprising a bottom and two support flanges by means of a conical head screw bearing on the cutting insert and screwing into the body of the tool holder by pressing the insert 20 gUr the bottom and said flanges. According to the invention, at least one of the abovementioned flanges consists of the truncated cone head with a large lower base of an adjustment screw located in the above-mentioned support in the vicinity of the plate.

Preferably, the head of the adjustment screw is extended under the large base of the aforementioned truncated cone by a cylindrical guide surface cooperating with the corresponding cylindrical rim of a housing formed in the support in intersection with the housing of the brochure.

The invention will be better understood during the description given below by way of purely indicative and non-limiting example which will make it possible to identify the advantages and the secondary characteristics thereof.

Reference will be made to the accompanying drawings in which: - Figure 1 is a schematic plan view of the device according to the invention, - Figure 2 is a sectional view II-II of Figure 1

Referring to these figures, we see a support 1 or 2 tool holder body provided with an end housing 2 on a plate 3 delimited by a base surface 2a, a first flange 2b and a second flange consisting of the head 4a of a screw 4 described in more detail below. The plate is fixed in this housing by a screw 5 5 with a conical head 5a. The head 5a has, in known manner, a certain eccentricity with respect to the hole in the plate, which allows, when the latter is screwed, to press the plate on the bottom 2a, the rim 2b and the head 4a of the screw 4.

The head 4a of this screw has a frustoconical outer surface 6, the large base of which is on the side of the base of the head. The slope of this surface is close to the slope of the draft 3a that the cutting insert has in known manner on its four w edges. Under this conical surface 6, the screw head has a cylindrical surface 7 for guiding it in the tool body. The latter com-15 carries for this purpose a housing 8 whose edges 8a enclose the cylindrical part 7 on almost all of its periphery. This housing 8 is placed so as to intersect with the housing 2 of the wafer 3.

The adjusting screw 4 has an operating means (here a hexagon socket 4b) for its screwing or unscrewing.

The adjustment of the wafer is carried out as follows (with the aid of a precise measuring instrument: comparator or the like). The plate is placed in its housing which is secured by gently tightening the screw 5. The screw 4 is placed, for example, in its low position (dashed lines in FIG. 2). The action of the screw 5 brings the plate 3 into contact with the surface 6 of the screw (and the flange 2b).

Sn going up the screw 4, we tend to push the plate outwards by causing the head 5a of the screw 5 to bend relative to the screw body (A in FIG. 2 illustrating the maximum bending of the head when the screw is raised to the maximum, that is to say in its position shown in solid lines). The screw 5 is then blocked when the plate is r in the desired position. The force collected by the screw 4 is supported by the walls 8a of the housing 8 which enclose very closely the above-mentioned cylindrical surface 7. It is the same if you want to make an adjustment in the direction of retraction of the wafer. The initial tightening of the screw 5 35 causing its head to bend, the movements of the plate are ensured by this bending which plays the role of elastic return during the upward or downward movements of the screw 4.

3 The invention is very simple to carry out and therefore very easy to implement.

It is not limited to the description which has just been given, but on the contrary covers all the variants which could be made to it without departing from its scope or its spirit. .

It finds an interesting application in the field of mechanical industries.

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Claims (2)

4 1. Device for micrometric adjustment of a stripped cutting plate, fixed in the housing of a support comprising a bottom and two support flanges by means of a conical head screw eccentric with respect to the body, bearing on the cutting insert 5 and screwing into the body of the tool holder by pressing the insert * on the bottom and said edges, at least one of the above edges being adjustable relative to the support, characterized in that said adjustable edge is constitutes by the truncated cone head with large lower base of an adjustment screw implanted in the aforementioned support 10 in the vicinity of the plate and in that the adjustment screw head extends under the large base of the above cone trunk a cylindrical guide surface cooperating with the corresponding cylindrical rim of a housing formed in the support in intersection with the housing of the wafer. 1 *