SU872225A1 - Honing head - Google Patents

Description

The invention relates to mechanical machining of holes and can be used in mechanical engineering when machining with the method of honing solid and intersected with the slots of the holes.

A known honing head, comprising a housing, in the grooves of which holders with screw bars 1 fixed on them are placed with the possibility of radial movement.

The disadvantage of the head is the impossibility of correcting geometrical errors, such as ovality, in holes of small diameter.

The purpose of the invention is to increase the quality by correcting the ovality of the hole.

The goal is achieved by the fact that L. sprja1. 1. And the bars and grooves of the hull K: i; i,; r.; ppovye in the form of bars, and the angle 1k; demi r.itovoy line working surface of the bars selected from

uf arcsin}

FIG. 2 shows section A-A in FIG. one; in fig. 3 is a diagram of the arrangement of the bars on the scan of the outer cylindrical surface of the head.

The honing head comprises a housing 1, in which a expansion rod 2 with two conical sections is installed in the central opening of which. Six screw grooves 3 are made in the housing. In the housing grooves, intermediate plates 4 and holders 5 with diamond or abrasive sticks 6 are mounted for radial movement. Intermediate plates, holders and bars are also screw.

In this case, the angle cJ of raising the helix of the working surface of the bars is equal to the value determined by the dependence

five

and agch51p-,

where t is the circumferential pitch of the bars;

Claims (2)

1 - the length of the bar. tiruyut with conical sections of the expanding rod 2. The head is equipped with annular springs 7 and a cylindrical spring 8 to return the bars to the perfect position. When the head expanding rod 2, receiving a given axial force from the machine uncoupling mechanism, while moving the relatively intermediate axially fixed intermediate plates 4 and holders 5 with bars 6, moves them in the radial direction, pressing the bars to the workpiece surface. Honing stones with screw working surfaces can, if necessary, be ground in working surfaces on the workpiece after installation in the head housing or grinding assembled with the head, as in well-known structures. Making helical bars with screws leads to a reduction in the difference between the radius values of the symmetrical contact of the bars in the minor axis of the oval without reducing the angular step between the bars. When increasing the angle of lifting the helix of the working surface of the bars to. the magnitude determined by the dependence of the arcsinf s, the radius vector symmetrically of the contact of the bars becomes equal to the minor axis of the oval hole being machined. In this case, the contact of the bars with the hole surface to be processed occurs in the region of the minor axis of the oval. This leads to an intensive correction of the geometry of the hole being machined. The bars during operation do not experience excessive pressure, determined by the non-roundness of the hole being machined. The pressure acting on the bars is equal to nominal. This leads to an increase in the performance of the head. Screw-shaped honing heads can be used for machining openings intersected by slots, for example, slotted or keyed. In honing heads, bars of increased width are used to cut the grooved holes. The width of the bars is chosen such that it exceeds the width of the groove, as otherwise, when unclamping the bars, they or the head itself will break. In the heads for machining holes with a diameter of less than 30-40 mm, no more than two or three bars of increased width can be placed. A head with such a small number of bars during work does not correct, but only copies the error of the geometric shape of the hole. Making the bars screwed provides the possibility of machining the holes intersected by the grooves without increasing the width of the bars. Claims. A honing head comprising a body in the slots of which holders with screw bars fixed to them are placed with the possibility of radial movement, characterized in that, in order to improve the quality by correcting the ovality of the hole, the bar holders and body slots are screwed in the shape of bars. 2. The head according to claim 1, wherein the elevation angle of the helix of the working surface of the bars is selected from the condition: CJ arcsin-l-J where t is the circumferential pitch of the bars; C-length of the bar. Information sources, . taken into account in the examination 1. US patent number 2038295, cl. 51-340, publ. 1936.