SU1379062A1 - Honing head for working holes - Google Patents

Abstract

The invention relates to devices for precise processing of internal surfaces of rotation by abrasive bars and can be used in the manufacture of precision parts of diesel engine fuel equipment, as well as other high-precision parts of a pneumohydraulic apparatus. The aim of the invention is to

Description

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Increasing the machining accuracy at the expense of the intensity of correcting deviations from the straightness of the holes, as well as the possibility of changing the cutting and supporting bars when they are worn. The head contains an expanding element placed in the housing 2. A cutting bar 3 is in contact with the expanding element along the inclined surface. In the other groove of the expanding element with an inclined surface there is a support bar 4 made of wear-resistant material. The angles of the inclined surfaces of the expanding element are chosen from the ratio ot K, where r is the angle of the inclined surface of the expanding element for the cutting bar, jb is the angle of the inclined surface of the expanding element for the support bar, K is the specified ratio of wearability of the support and cutting bars. The wear of the bars is compensated for by the possibility of moving them relative to the body in the radial direction. 3 il.

The invention relates to devices for precise processing by abrasive sticks, for example, diamond, internal surfaces of rotation and can be used in the manufacture of high-precision parts of a pneumohydraulic apparatus having precision holes.

The aim of the invention is to improve the accuracy of processing holes.

The goal is achieved by the fact that the support bar is in contact with the expanding element along an additional inclined surface and is installed in the housing with the possibility of radial movement relative to it and cutting its bar.

Such an embodiment of the honing head leads to the fact that as the support bar is worn out, which can move radially relative to the body and the cutting bar, it advances and thereby establishes the required size, which provides increased machining accuracy.

The interaction of the expanding element along two inclined surfaces with angles to jb with the cutting and supporting bars, respectively, leads to mutual balancing of forces, which creates optimal conditions for the operation of the cutting bar, which increases processing accuracy and durability.

tool.

Figure 1 shows the honing-holopka assembly, general view; in fig. 2 is a section aa in FIG. 1 (head

15

with one single bar); fig.Z - the same, the head with two supporting bars.

Expansion element 1 is located in

5 housing 2, in the groove of which the cutting bar 3 is in contact with the expanding element, having an inclined surface a, and in the groove of the expanding element with a slope 6

 the support bar 4 of poorly-worn material, the sleeve 5, is connected to the spring 6, which holds the bars from falling out. The housing 2 is fastened to the machine with a block 7, and the expanding element 1 is connected to the machine's spindle by a nut 8. The working part, for example, the plug of the diesel fuel pump plunger, is installed in the floating device collet

 (not shown).

The head works as follows.

The head with the bars is inserted into the hole of the workpiece, the rotational and reciprocating movements are reported to the head. The expanding element 1 under the action of the rod (not shown) moves downward relative to the housing 2 and due to the presence of inclined surfaces at angles ω and 3 on it radially moves the cutting 3 and supporting 4 bars, respectively, by the amount of metal removal and wear of the bars. By windows5

In the finishing cycle, the tool is withdrawn from the hole to be machined.

At the beginning of work, the support bar 4 is automatically set to a size equal to the radius of the final size of the part hole (after machining), and the cutting bar 3 is set to the size equal to the radius of the workpiece hole (before machining),

At the beginning of the process, the machining center of the part hole is asymmetrical to the central axis of the tool by the amount of allowance. As the crimping element is machined, the cutting bar advances the inclined surface a and the cutting bar 3 to the size needed for the part and the bar wear, and the support bar 4 only to the size of its wear, i.e. compensates for its own wear. In connection with this, when selecting an angle value, about a total amount of allowance and wear is taken into account, and when selecting an angle value jb, only wear of the support bar is taken into account.

The angles oi and / 3 are interdependent

d (K

where K is the specified ratio of wear resistance of the support and cutting bars.

no6ep Hocf77f f oc / fe off / oafofn / ft /

Claims (1)

i.e., the higher the wear resistance of the support bar, the less the angle P 5 is specified. A honing head for machining holes, comprising a housing with at least one support bar and cutting bar placed on it, located on the inclined surface of the expanding element, characterized in that, in order to achieve accuracy, an additional 15 inclined surfaces are made on the expanding element the number of support bars that are installed with the possibility of radial movement relative to the body and the cutting bar, while the angles of the inclined surfaces of the expanding element are selected from eni where oi - the angle of the inclined surface of the expanding element under the cutting bar; - angle of inclined surface Expansion element under the support bar; K - given the ratio of the wear resistance of the support and cutting bars. BUT FIG. 2  6 m (q: l7b after oS / yol w R Fig.Z