SU732081A1 - Cutting tool for machining bores - Google Patents

Description

(54) CUTTING TOOL FOR MACHINING HOLES

I

The invention relates to cutting tools for metalworking, and specifically to tools for machining holes.

A cutting tool for machining holes is known, which contains at least one tool holder made in the form of a two-arm lever swinging on an axis with a cutting element fixed on the end of one of the arms and spherical supports in contact with oppositely oriented inclined wedge surfaces. Spherical supports for this tool are located on the second shoulder 1.

This tool is closest to the invention in its technical essence and the achieved result.

The cutting element and the supports are located on different arms of the lever, as a result of which the cutting element is arranged cantilever with respect to the supports. This leads to a decrease in the rigidity of the co-adjustment and durability.

The aim of the invention is to increase the rigidity and durability of the structure.

This goal is achieved by the fact that the spherical supports are located on both sides of the tool shaft swing axis, and the wedge

made of composite, of two inserts spring-loaded in the axial direction, with the tangent at the point of contact of the support with the forming insert located underneath the tool holder to the swing axis. 5 In FIG. 1 shows a cutting tool for machining holes, a front view with a partial cut; in fig. 2 shows section A-A in FIG. one.

Claims (1)

The cutting tool for machining holes has a housing 1, in grooves of which, on 10 axles 2, tool holders 3 with cutting elements 4 are installed. In the internal cavity of the housing there is a wedge made of composite of two conical inserts 5 and 6 with oppositely directed inclined surfaces. The inserts are coaxial, spring-loaded in the axial direction by the spring 7 and having from the front and rear ends of the body respectively the stops 8 and 9. The centering of the inserts 5 and 6 in the internal cavity of the body relative to the supports of the holder 3 is mounted with the help of flanges 10 and 11 mounted on the front and the rear ends of the housing and fastened with screws 12. The tool is adjusted to the diameter of the hole machining with the help of a screw 13 and lock nut 14. In order to increase the vibration resistance of the cutting tool along the axis 2 of the tool Atele 3 has a spring 15 installed, fixed by an angular stop 16 with a screw 17. The tool holder 3 is made in the form of a two-arm lever swinging on the axis 2 with a cutting element 4 fixed on the end of one of the arms and spherical supports 18 and -19 located along both side axis-2 swing toolholder. The supports 18 are in contact with the forming insert 5, and the supports 19 with the forming insert 6. The tangent at the contact point of the support with the forming insert is at an angle U to the tooling axis of the tool holder 3. This is achieved by displacing the tool holder support point relative to the axial plane of the inserts, perpendicular to the axis of the swing tool holder. For mounting the cutting tool on the machine, the platform 20 is made as one piece, for example, welding with the body 1. The tool works as follows: In the working position, the cutting element 4 is adjusted to the machining diameter by inserting the insert 5 on the toolholder support 18 3. The angle of the insert cone equal to 1 ° 30-5 °, which ensures the contact of the insert and tool holder. After the machining of the hole of the stop 8 of the insert 5, the encounter on the path of the insertion limiter is earlier than the path switch of the machine, the longitudinal feed (not shown) of the machine, causes the inserts to move along the axis of the body with the continuing longitudinal movement of the tool. In this case, the insert 5 comes out of contact with the tool holder, and the insert 6 comes into contact with it, causing the tool holder to swing around its axis, which leads to the removal of the cutting element 4 from the machined surface. At this time, the machine switch actuates, and the cutting tool is withdrawn from the machined hole. On the side of the rear end of the tool body, the second stroke limiter is installed on the machine, which, interacting with upari 9, introduces, as indicated above, the cutting element into the working position. To adjust the position of the inserts 5 and 6 relative to the tool holder supports, a washer 21 is installed between the spring 7 and the insert 6. The cutting tool can be made with one tool holder, in this case the inserts 5 and 6 are flat. This embodiment of the cutting tool provides increased rigidity of the structure and eliminates the formation of scratches during the return stroke of the tool. Claims A cutting tool for machining holes containing at least one tool holder made in the form of a two-arm lever swinging on an axis with a cutting element fixed at the end of one of the arms and spherical supports in contact with differently directed inclined wedge surfaces, characterized in that In order to increase the rigidity and durability of the tool, the spherical bearings are located on both sides of the toolholder’s swing axis, and the wedge is made of a composite of two spring-loaded in axial direction tangential at the point of contact of the bearing with the forming insert is located at an angle of swing of the toolholder. Sources of information taken into account in the examination 1. US Patent No. 2433976, cl. 77-58, 1948.