RU180546U1 - BORING MULTI-BLADE HEAD - Google Patents

Abstract

The utility model is intended for processing round cylindrical holes in machine parts to increase their accuracy to the seventh quality. The purpose of the utility model is to increase its life due to the possibility of multiple adjustment to size to compensate for dimensional wear of cutting blades, as well as to increase the vibration resistance of the head during cutting. The goal is achieved by the fact that in the head housing fixedly mounted on the mandrel, cylindrical holes are made in the radial direction, in which rod cutters of circular cross section are installed with an angle in the plane of the auxiliary cutting edges equal to zero. On the side surface of each cutter, a flat is made, the plane of which is parallel to the axis of the cutter and is inclined in cross section at an angle to the auxiliary cutting edge of the cutter. The cutter is fixed in the housing with a screw on the flange with a perpendicular arrangement of the flat plane to the axis of rotation of the head. Each cutter rests on a sleeve mounted on the mandrel with the possibility of its movement along the axis of the mandrel along its conical lateral surface, which makes it possible to repeatedly adjust the head to size. The location of the auxiliary cutting edges at an angle to the axis of rotation of the head provides an increase in its vibration resistance.

Description

A multi-blade boring head refers to the technology of mechanical engineering and can be used for cutting round cylindrical holes in order to increase their accuracy to the seventh grade.

The prototype of the utility model is the boring head according to the patent of the Russian Federation for the invention No. 2475339, B23B 29/03. The prototype is a case with a mandrel, in the grooves of which along the axis of the mandrel are made grooves of rectangular cross-section, in which rod cutters equipped with cutting inserts are installed and fixed with screws, the cutting edges of which are axially and radially offset relative to each other in order to increase the depth of cutting.

The disadvantages of the prototype are:

1. The small resource of the head due to the impossibility of repeatedly adjusting the head to the executive size to compensate for dimensional wear as the blades wear.

2. Insufficient vibration resistance of the head, because the design of the head does not implement any solutions aimed at eliminating the possibility of vibration and the formation of cuts on the treated surface

The purpose of the utility model is to increase the resource of the head by repeatedly adjusting the head to the executive size and eliminating the possibility of vibration.

The goal is achieved by the fact that cylindrical through holes are made in the head housing in radial directions, in which the core cutters are mounted with the possibility of their movement in the radial direction to compensate for their dimensional wear. The core of each cutter has a circular cross section, on the lateral surfaces of which flat flats are made with a slope at an angle to their auxiliary cutting edges with a plane angle equal to zero. Each cutter is supported by an end face on the sleeve along its lateral surface, which is mounted with the possibility of its axial movement along the mandrel, and is fixed on the flat by a screw so that the flat plane of each cutter is perpendicular to the axis of the mandrel, as a result of which the cutting edge of each cutter is at an angle to the axis of the mandrel. Moving the sleeve along the mandrel with a slight weakening of all the screws holding the cutters allows you to simultaneously set the cutters to a predetermined size of the head, and the inclined arrangement to the axis of rotation of the head of the auxiliary cutting edges eliminates the coincidence of traces left by the cutting edges on the surfaces formed during cutting, which prevents the excitation and occurrence of vibration in self-oscillations

In FIG. 1 shows a longitudinal section of the head, and FIG. 2 is a cross section of a plane 1-1 passing along the axes of the cutter rods.

In the housing 3 (Fig. 1), cylindrical holes are made in which rod cutters 2 of circular cross-section of the rod are mounted, resting ends on the sleeve 1 along its conical surface.

The sleeve 1 is mounted on the mandrel 6 with the possibility of its movement along the mandrel to adjust the size of the head. The angle in terms of the auxiliary cutting edge of each tool is equal to zero. On the side surface of each cutter, a flat is made, the plane of which is parallel to the axis of symmetry of the cutter rod and is inclined at an angle to the auxiliary cutting edge of the cutter. Each cutter is fixed on the flat by a screw 5 and is locked with a lock nut 4.

For the manufacture and use of the head does not require any unknown devices or technologies.

Claims (1)

A multi-blade boring head comprising a housing with pivotal cutters, characterized in that it is provided with a mandrel and a sleeve with a lateral conical surface, the housing being fixed on said mandrel and the sleeve being movable along the axis of the mandrel, while in the housing in the radial direction cylindrical holes are made in which the mentioned core cutters are installed, made with a round cross section and cutting blades, the auxiliary angle in the plan of which is zero, while on On the surface of the rod of each cutter, a flat is made in the form of a plane parallel to the axis of the cutter rod and at an angle to the auxiliary cutting edge of the cutter, with each cutter being set so that the flat plane is perpendicular to the mandrel axis, fixed on the flat by a screw and rests on the bushing with said end face its lateral conical surface.

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