RU9789U1 - HONING HEAD - Google Patents

Abstract

A honing head comprising a housing with an expandable cone and pads with abrasive blocks, mounted axially movable relative to the housing, characterized in that it is provided with an axially movable separator, in the inclined grooves of which end blocks with abrasive bars are located.

Description

HONING HEAD

The utility model relates to the field of final machining of holes, in particular, to honing of holes and holes with a shoulder that do not have a recess for hon exit

Known for the design of a honing head for machining blind holes Sem Finishing - abrasive processing methods. The reference manual under .С Chistoserdova Minsk, 1E83g, SL6-47), containing a housing with an expanding cone, bearing blocks with abrasive bars installed with the possibility of axial movement relative to the housing.

The use of honing heads of this design has the following disadvantages

 at the bottom of the blind hole, a recess should be provided for the exit of the bars, which is structurally and technologically not always feasible,

- exact reversal of the vertical movement of the honing head in the hole to be machined is required, since otherwise an emergency situation may occur when it hits the bottom of the hole.

The design of a honing head for processing blind holes is also known (see a, p. K 1543729, MKI V24V 33/02), comprising a housing, inside of which an axially movable drawer with an expanding cone is installed, pads with abrasive bars are installed in the radial windows of the housing .

However, such a honing head does not allow simultaneous processing of the surface of the hole and the butt end.

MKI V24V 33/00

- 2 This is achieved by TQU, it is a honing head comprising a housing with an expanding cone and pads with abrasive blocks mounted axially movable relative to the housing, equipped with an axially movable separator, in the inclined grooves of which end blocks with abrasive bars are located.

In FIG. 1 shows a longitudinal section through a honing head

On Fig, 2 is a transverse section,

The honing head consists of a housing 1, in which there are knives 2 expandable by a cone 3 by means of a rod 4 from the machine expansion mechanism. An axially movable separator 5 is installed on the housing, in the windows 6 of which there are radial blocks 7 with abrasive or diamond blocks fixed to them 8, extended to the end of the radial pads Radial pads with their flat surfaces rest on the knives and are prevented from falling out of the separator windows by springs 9 Separator, moving together with the radial pads rel with respect to the housing in the axial direction, it is held in an extremely forward position by the spring 10. In this case, the separator is kept from turning relative to the housing by the fingers 11 included in the grooves 12 of the housing B of the front of the separator, inclined grooves 13 are installed in which the end blocks 14 are mounted with the possibility of radial movement with abrasive bars 15, End pads are kept from falling out of the separator by springs 9 and end plate 16.

The honing head operates as follows

In the reduced state, the honing head, fixed in the machine spindle, is inserted into the hole being machined, which has a thrust shoulder (and the groove at the end of the hole for the exit of the bars is not required) and it is informed back-and-forth movement The course of the honing head is adjusted so that at the end of the separator end 5 C / or end blocks 14) ran the position of the end face of the shoulder (or bottom) of the hole by 3 - 5 mm. In this case, the separator S, abutting against the end face of the shoulder from 3 holes with abrasive bars 15, makes it necessary to move end inclined grooves 13 end pads 14, shifting them in the radial direction and cutting the end of the shoulder of the hole.

Further, a rotational movement is reported to the honing head. The expanding rod 4 is supplied with operating pressure from the hydraulic system of the machine. It is not shown) As a result of the axial movement of the rod 4, the expanding cone 3 acts on the knives 2 and the radial blocks 7 resting on them until the abrasive bars B come into contact with the surface of the hole being machined and the cutting process begins,

From this moment on, the arising axial component of the cutting force exceeds the force of the compressed spring 10 and the separator moves reciprocally — progressively with the housing 1 of the honing head as a single unit, while the separator 5 retains the axial position occupied by it upon running over the end of the shoulder of the machined hole

Thus, the surface of the hole is processed along the entire length to the bottom of the part, regardless of the accuracy of the reverse mechanism and fluctuations in the batch of size parts from the shoulder end to the base surfaces of the fixture, and the possibility of a tool hitting the shoulder end is excluded.

The proposed design of the honing head was tested when honing the landing surfaces D - 80 mm and D - 2 mm under the rolling bearings in the crankcase of the rear axle gearbox of the GAZ - 3302. As a result, in holes with a shoulder 7 mm wide, mated to the hole surface with a radius of R 1 mm, roughness Ra 0.32 - microns.

Claims (1)

A honing head comprising a housing with an expanding cone and pads with abrasive blocks, mounted axially movable relative to the housing, characterized in that it is provided with an axially movable separator, in the inclined grooves of which end blocks with abrasive bars are located.