Honing tool for honing blind bores

Abstract

The invention relates to a honing tool (1) that is suitable in particular for honing blind bores (5), comprising a stone carrier (3), a first honing stone segment (16) and a second honing stone segment (17). The first honing stone segment (16) and the second honing stone segment (17) are fastened in a groove (22) of the stone carrier (3). In addition, the stone carrier (3) comprises an end (10) with which the stone carrier (3) can be introduced into a bore (5). The second honing stone segment (17) is fastened closer to the end (10) of the stone carrier (3) than the first honing stone segment (16). Moreover, the wear resistance of the second honing stone segment (17) is greater than a wear resistance of the first honing stone segment (16). In this way, a straight bore (5) can be honed even in the case of limited idle travel (9).

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to a honing tool that is suitable in particular for honing blind bores.[0002]In order to hone a through bore, an idle travel is required at the upper and lower end of the bore. The required idle travel generally corresponds approximately to a third or the half of the honing stone length. In the case of a particular application, the actual idle travel is also determined by the shape of the bore. If, for example, the bore is narrower at the upper end than at the lower end, a larger idle travel is then required towards the top. If on the other hand the bore is narrower at the lower end, a larger idle travel is then necessary towards the bottom. By the correct selection of the idle travel, the bore is always kept straight. In the case of a blind bore, the lower idle travel is however severely limited. If the bore is now narrower at the bottom than at the top, the idle travel then cannot be increased towards the bottom for geometric ...

AI Technical Summary

Benefits of technology

[0006]In an advantageous manner, a groove is configured on the stone carrier, in which the honing stone segments can be inserted in a successive arrangement. Especially when combining the individual honing stone segments into a common honing stone, the successive arrangement is predefined by the assembly. By successively arranging the honing stone segments, a uniform machining of the bore is made possible.

[0007]It is also advantageous that the second honing stone segment, which has the greatest wear resistance, at least substantially adjoins the end of the stone carrier. In so doing, the honing stone or respectively the section which is composed of the honing stone segments wears less markedly in the region of the end of the stone carrier, and therefore an advantageous machining, which keeps the bore straight, is even achieved here in the case of limited idle travel.

[0008]It is also advantageous that between the second honing stone segment and the end of the stone carrier, an offset is formed which is on the end side and on which the second honing stone segment bears. Particularly in combination with the groove, in which the honing stone segments are inserted, a particularly good support of the honing stone segments on the stone carrier results as a consequence.

[0009]It is furthermore advantageous that the honing stone segments are disposed on one side of the honing stone body, that a supporting bar is provided and that the supporting bar is disposed on a further side of the honing stone body which faces away from said former side of the honing stone body. It is furthermore advantageous that the first honing stone segment is designed longer with respect to a longitudinal axis of the honing stone body than the second longitudinal axis segment. The machining of the bore by means of honing can therefore be performed to a great extent by the first honing stone segment, whereas the second honing stone segment and where applicable additional honing stone segments serve to compensate for the shortened idle travel at the end of the honing stone carrier by an intensified machining of the bore in this end region.

[0010]In an advantageous manner, the different wear resistances of the honing stone segments result from different specifications for a grit size and / or grit type and / or bond and / or concentration of the grits for the honing stone segments. This results in the honing stone segments not wearing down so fast in the region of the end by virtue of the fact that the honing stone carrier is equipped with honing stone segments of different specifications for the respective honing stone abrasive layer on the honing stone segments.

[0011]Longer tool lives of the honing tools, improved bore geometries and shorter machine downtimes can thus be achieved and therefore a greater operating efficiency is also achieved. In addition, advantages result with respect to mating parts having very tight tolerances, for example with respect to a pump piston and a pump cylinder, which have to be honed in a coordinated manner.

Problems solved by technology

In the case of a blind bore, the lower idle travel is however severely limited.

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