SU975239A1 - Tool for working deep holes - Google Patents

Description

(54) TOOL FOR HANDLING DEEP HOLES

one

The invention relates to mechanical engineering and can be used for machining deep holes.

A known tool for machining deep holes includes a cutting head with cutting and guiding elements, in which there are additional guiding elements made in the form of rolling elements 1.

The disadvantage of this tool is the increased requirements for making the bearing surface of the tool head housing. This is due to the fact that the diameter of the rolling bodies described is determined by the diameter of the rolling bodies and the diameter of the supporting surface. The Y-reading of a sufficiently large stiffness of the rolling bodies, the diameters of the supporting surface and the rolling bodies is required to be manufactured sufficiently accurately in order to provide a predetermined amount of pressure, which ensures an optimal plastic deformation force on the surface.

The operation of the tool and the fact that the bearing surface of the rolling bodies is located on the body of the tool head and the rolling elements to a large extent influence the position of the axis

heads, i.e., the head is based on the three guide bars on the one hand, the rolling bodies in the middle and the supporting surfaces of the shank on the other side. With such a basing significantly

5, the working conditions of the cutting edges of the tool and, in particular, the forming corner, are complicated.

In addition, the inner surface of the bypass channel is stationary relative to the cutting edges of the tool head, which leads to the formation of chip plugs, a sharp increase in efforts on the cutting elements and their breakage. This is particularly evident in tools with ejector chips.

15 An object of the invention is to simplify tool manufacture, increase the quality of machined holes, and improve chip control conditions.

Claims (2)

The goal is achieved by the fact that inside the body of the tool head there is a support element in the form of a hollow cylinder, exerting a force on the deforming elements made in the form of rolling bodies installed in the through slots of the body of the tool head. In addition, grooves are made on the inner surface of the support element. At the same time, the required force of pressing the deforming elements against the walls of the hole being machined is achieved by the ratio of the diameters of the deforming elements and the support element, and the range of control of this force is much wider than in a known tool, since the diameter of the support element is much larger than the diameter of the deforming elements, and, consequently, its rigidity varies over much wider limits by varying the thickness of its wall. The rolling bodies, rolling over the support element, give it a rotational motion, thereby creating the relative movement of the inner channel and cutting edges, which is necessary for improving the chip remover. The rotatable support element provides additional movement to the chip, capturing it with ribs on the support element, which improves chip breaking and chip removal. This is especially the case when processing materials that give drained chips. All deformation forces are closed on the support element and do not act on the tool head. The indicated arrangement of the deforming elements excludes the possibility of an indefinite basis, since the deforming elements cannot be located without exerting a strong effect on the body of the tool head. FIG. 1 shows a tool, a general view; in fig. 2 shows section A-A in FIG. one; FIG. 3 - ejector drill, general view. The tool contains a boring bar 1, at the end of which a tooling is mounted on the head with cutting 2 and guiding 3 elements. In the case of the tool head 4, there are made through grooves 5, in which the rolling elements 6 are arranged, in which standard bearing bearings are used. The rolling bodies 6 are spring-loaded with a support element 7 mounted inside the tool head. On the outer surface of the support member there are annular grooves 8, corresponding to the profile of the rolling bodies, for fixing the support member 7 in the axial direction. The end of the support element rests on the fluoroplastic ring 9 to seal the joint of the support element and the housing. The corrugations 10 are made on the inner surface of the support element. For an ejector drill (FIG. 3), the support element performs the functions of the head bushing and forms an ejector 1 MF slit 12 with the profile surface of the inner pipe 11. The tool for machining holes works as follows. With the relative rotational and translational movement of the workpiece 9 and the tool head, the cutting elements 2 produce chips, while the tool head rests on the guide elements 3. The rolling elements 6 are pressed against the surfaces of the support element 7 and the hole being machined by the elastic forces arising when compressing the elastic element at the entrance of the tool head into the hole. The rolling bodies 6 rotate in the grooves 5 of the tool head under the action of friction forces arising between the rolling bodies and the surface of the hole, transmitting the rotation to the support element 7 during relative rotational and translational movement of the workpiece and the tool head. At the same time, they produce plastic deformation of the surface of the hole. The cutting fluid removed from the cutting elements 2 by the flow of cutting fluid is additionally driven by the rotating support member 7. In this case, the chips are thrown to the center of the flow of the liquid, and in the event of a discharge of the discharge chips, when interacting with the corrugated rotating inner surface of the support member 10, it is crushed. The use of the invention allows to simplify the manufacture of the tool, to improve the quality of the machined holes, to process difficult-to-machine materials. Claim 1. A tool for machining deep holes, comprising a tool head with cutting guides and deforming elements made in the form of rolling bodies, characterized in that, in order to improve the quality of the machined holes and improve the conditions of a chip breaker, a support element is installed inside the tool head body. as a hollow cylinder, exerting a force on the deforming elements made in the form of rolling elements, installed in the through slots of the body th head. 2. A tool according to claim 1, characterized in that corrugations are made on the inner surface of the support member. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 643252, cl. B 23 B 51/06, 1976. / 387 / ghhh g::; 4 huh | l G 77 l. w ///////// sh //// ///////////  AH g 5 4 (