Honing tool and method for producing a honing tool

Abstract

The invention relates to a honing tool ( 100 ) for machining the inner surface of a bore in a workpiece by means of at least one honing operation, comprising: a tool body ( 110 ) that defines a tool axis ( 112 ) and has a guide bore ( 115 ), which is coaxial to the tool axis, for receiving two adjusting elements which can be moved axially independently of each other, and a plurality of guide openings ( 160 ) which are distributed over the circumference of the tool body ( 110 ) and lead radially relative to the tool axis ( 112 ) from the guide bore ( 115 ) to an outer face of the tool body; a plurality of cutting means supports which each have a support section ( 152 ) that is wide in the circumferential direction and comprises an outer face for receiving cutting means, and have an adjusting section ( 158 ) that is narrower than the support section and has an inclined surface on the inner face facing away from the outer face for interacting with an associated inclined surface of one of the two adjusting elements. The adjusting sections of cutting means supports are each radially movably received in one of the guide openings. All the cutting means supports which can be adjusted via the first adjusting element form a first cutting group, and all the cutting means supports which can be adjusted via the second adjusting element form a second cutting group, wherein the tool body ( 110 ) has fourteen or more guide openings ( 160 ) which have an irregular angular division such that one or more of the guide openings has a different angular spacing (WA) from the directly adjacent guide openings in the circumferential direction.

1 . A honing tool for machining an inner surface of a bore in a workpiece by means of at least one honing operation, in particular for honing cylinder run faces during production of cylinder blocks or cylinder liners for reciprocating piston engines, comprising:
 a tool body which defines a tool axis and has a guide bore coaxial to the tool axis for receiving two axially movable feed elements, and a plurality of guide openings which are distributed over the circumference of the tool body and lead radially relative to the tool axis from the guide bore to an outside of the tool body;   a first feed element and a second feed element which are received in the guide bore and are axially movable independently of one another;   a plurality of cutting means carriers which each have a carrier portion which is wide in the circumferential direction and has an outside for receiving cutting means, and have a feed portion which is narrower than the carrier portion and has a sloping face on the inside facing away from the outside for cooperating with an assigned sloping face of one of the two feed elements, wherein the feed portions of cutting means carriers are each radially movably received in one of the guide openings;   wherein all cutting means carriers which can be advanced via the first feed element form a first cutter group, and all cutting means carriers which can be advanced via the second feed element form a second cutter group;   wherein:   the tool body has fourteen or more guide openings which have an irregular angular division such that one or more of the guide openings has a different angular spacing from the directly adjacent guide openings in the circumferential direction.   
     
     
         2 . The honing tool as claimed in  claim 1 , wherein the number of guide openings is an even number, wherein guide openings lie in pairs diametrically opposite one another relative to the tool axis. 
     
     
         3 . The honing tool as claimed in  claim 1 , wherein the number of guide openings is not divisible by four. 
     
     
         4 . The honing tool as claimed in  claim 1 , wherein the guide openings are distributed over the circumference of the tool body such that there is a two-fold rotational symmetry around the tool axis, but no mirror symmetry relative to a plane containing the tool axis. 
     
     
         5 . The honing tool as claimed in  claim 1 , wherein for a number T of cutting means carriers, one of the cutter groups comprises a number T/2−1 of cutting means carriers and the other cutter group a number T/2+1 of cutting means carriers. 
     
     
         6 . The honing tool as claimed in  claim 1 , wherein the honing tool has a guide group with multiple non-cutting guide strips which are distributed on the tool body with an irregular angular division over the circumference of the tool body. 
     
     
         7 . The honing tool as claimed in  claim 6 , wherein four non-cutting guide strips are arranged in pairs, diametrically opposite, on the tool body, such that tool body segments lying between directly adjacent guide strips in the circumferential direction in pairs have different circumferential widths. 
     
     
         8 . The honing tool as claimed in preceding  claim 1 , wherein the guide openings and/or the cutting means carriers have an axial length which amounts to more than 50% of the maximum effective outer diameter of the honing tool, in particular between 80% and 95% of this outer diameter. 
     
     
         9 . The honing tool as claimed in  claim 1 , wherein carrier portions have on the outsides multiple mutually parallel receiving grooves, each for receiving at least one strip-like cutting means unit. 
     
     
         10 . The honing tool as claimed in  claim 1 , wherein one, several or all receiving grooves are fitted with cutting means units which substantially fill the entire length of a receiving groove. 
     
     
         11 . The honing tool as claimed in  claim 1 , wherein a short strip-like cutting means unit is arranged in the at least one receiving groove. 
     
     
         12 . The honing tool as claimed in  claim 1 , wherein the tool body is equipped according to a configuration selected from the following group:
 a first configuration, in which on diametrically opposite sides, all cutting means carriers of the first cutter group belonging to one side are arranged directly next to one another, and offset thereto in the circumferential direction, on diametrically opposite sides, all cutting means carriers of the second cutter group belonging to one side are arranged directly next to one another;   a second configuration, in which within the larger tool body segments, cutting means carriers of different cutter groups lie alternately next to one another so that each cutting means carrier has direct neighbors of the other cutter group, and in the narrower tool body segments, there is a pair of cutting means carriers of the same cutter group lying next to one another;   a third configuration, in which cutting means carriers of both cutter groups are distributed intermingled over the circumference, wherein in the narrower tool body segments, cutting means carriers of different cutter groups lie alternately next to one another, and in the wider tool body segments, two cutting means carriers of the same cutter group are arranged directly next to one another;   a fourth configuration, in which within the tool body segments between directly adjacent guide strips, cutting means carriers of both cutter groups are arranged alternately next to one another in the circumferential direction.   
     
     
         13 . A method for producing a honing tool for machining an inner face of a bore in a workpiece by means of at least one honing operation, in particular for honing cylinder run faces in production of cylinder blocks or cylinder liners for reciprocating piston engines, with the following steps:
 provision of a tool body which defines a tool axis and comprises a guide bore coaxial to the tool axis for receiving two mutually independently axially movable feed elements, and a number of fourteen or more guide openings which lead radially relative to the tool axis from the guide bore to an outside of the tool body and are distributed over the circumference with an irregular angular division, such that one or more guide openings have different angular spacings from the directly adjacent guide openings in the circumferential direction;   equipping the tool body with cutting means carriers each having a carrier portion which is wide in the circumferential direction and has an outside for receiving cutting means, and have a feed portion which is narrower than the carrier portion and has a sloping face on the inside facing away from the outside for cooperating with a sloping face of a feed element, wherein the feed portions of cutting means carriers are each inserted into one of the guide openings in the radial direction;   equipping the tool body with a first feed element and a second feed element by insertion into the feed bore;   wherein the cutting means carriers and the feed elements are adapted to one another configuration-dependently, such that the first feed element acts only on cutting means carriers of a first cutter group and the second feed element acts only on cutting means carriers of a second cutter group.   
     
     
         14 . The method as claimed in  claim 13 , wherein the tool body is equipped according to a configuration which is selected from the following group:
 a first configuration, in which on diametrically opposite sides, all cutting means carriers of the first cutter group belonging to one side are arranged directly next to one another, and offset thereto in the circumferential direction, on diametrically opposite sides, all cutting means carriers of the second cutter group belonging to one side are arranged directly next to one another;   a second configuration, in which within the larger tool body segments, cutting means carriers of different cutter groups lie alternately next to one another so that each cutting means carrier has direct neighbors of the other cutter group, and in the narrower tool body segments, there is a pair of cutting means carriers of the same cutter group lying next to one another;   a third configuration, in which cutting means carriers of both cutter groups are distributed intermingled over the circumference, wherein in the narrower tool body segments, cutting means carriers of different cutter groups lie alternately next to one another, and in the wider tool body segments, two cutting means carriers of the same cutter group are arranged directly next to one another;   a fourth configuration, in which within the tool body segments between directly adjacent guide strips, cutting means carriers of both cutter groups are arranged alternately next to one another in the circumferential direction.   
     
     
         15 . The honing tool as claimed in  claim 2 , wherein identical cutting means carriers of the same cutter group with cutting means provided in identical fashion are arranged at the guide openings diametrically opposite one another. 
     
     
         16 . The honing tool as claimed in  claim 3 , wherein the tool body has precisely fourteen guide openings or precisely eighteen guide openings or precisely twenty-two guide openings. 
     
     
         17 . The honing tool as claimed in  claim 5 , wherein mutually identical cutting means carriers fitted with cutting means of the same cutter group are arranged at the diametrically opposed guide openings. 
     
     
         18 . The honing tool as claimed in  claim 7 , wherein in the tool body segments with the greater circumferential width, there is a number N, and in the tool body segments with smaller circumferential width, there is a number N-1 of guide openings arranged directly next to one another. 
     
     
         19 . The honing tool as claimed in  claim 1 , wherein carrier portions have on the outsides two, three or four mutually parallel receiving grooves, each for receiving at least one strip-like cutting means unit. 
     
     
         20 . The honing tool as claimed in  claim 11 , wherein the cutting means unit has a length which corresponds to less than 50% of the axial length of the carrier portion. 
     
     
         21 . The honing tool as claimed in  claim 20 , wherein cutting means are arranged exclusively in an axially short region having a length which is less than 50% of the axial length of the carrier portion.