APPARATUS FOR PROCESSING CYLINDER WALLS OF INTERNAL COMBUSTION ENGINES

Abstract

The invention relates to an apparatus for processing cylinder walls of internal combustion engines (1), including a cutting element (4). The cutting element (4) is arranged on a rotary cutting ring (3). The cutting element (4) has a slit contour (5) with a plurality of cutting edges (6) arranged next to each other in a direction of an axis of rotation of the rotary cutting ring. And, the individual cutting edges (6) face in a direction of rotation of the rotary cutting ring.

Claims

1. An apparatus for processing cylinder walls of internal combustion engines, the apparatus comprising a cutting element arranged on a rotary cutting ring, wherein the cutting element has a slit contour with a plurality of individual cutting edges arranged next to each other in a direction of an axis of rotation of the rotary cutting ring, and wherein the individual cutting edges face in a direction of rotation of the rotary cutting ring.

2. The apparatus according to claim 1, wherein the cutting element is made of a material comprising diamond.

3. The apparatus according to claim 1, wherein the cutting element is made of diamond.

4. The apparatus according to claim 1, wherein the cutting element is substantially cuboid, wherein the slit contour is introduced into a surface of the cuboid cutting element by cutting grooves.

5. The apparatus according to claim 1, further comprising a holding apparatus, wherein the holding apparatus is releasably connectable to the cutting ring.

6. The apparatus according to claim 1, wherein the cutting ring has at least a first outer circumferential section with a substantially constant outer radius, at least a second outer circumferential section with an outer radius that continuously changes in the direction of rotation, and at least a third outer circumferential section with an outer edge that runs substantially in a radial direction.

7. The apparatus according to claim 6, wherein a surface of the cutting element lies on the second outer circumferential section of the cutting ring, and another surface of the cutting element lies on the third outer circumferential section of the cutting ring.

8. The apparatus according to claim 5, wherein the cutting ring has at least a first outer circumferential section with a substantially constant outer radius, at least a second outer circumferential section with an outer radius that continuously changes in the direction of rotation, and at least a third outer circumferential section with an outer edge that runs substantially in a radial direction.

9. The apparatus according to claim 8, wherein a surface of the holding apparatus lies on the second outer circumferential section of the cutting ring, and another surface of the cutting element lies on the third outer circumferential section of the cutting ring.

10. The apparatus according to claim 1, wherein a plurality of cutting elements are arranged on the cutting ring, wherein a longitudinal axial position with regard to the axis of rotation of at least one cutting edge of a first cutting element of the plurality of cutting elements is offset relative to the longitudinally axial position with regard to the axis of rotation of at least one cutting edge of a second cutting element of the plurality of cutting elements.

11. The apparatus according to claim 1, wherein a plurality of cutting rings are arranged by means of a mandrel on a common axis of rotation.

12. The apparatus according to claim 11, wherein the cutting rings are configured to be rotatable and releasably fixed relative to each other at any angular distances in the direction of rotation when mounted on the mandrel.

13. The apparatus according to claim 1, wherein the cutting ring has a cooling channel hole for cooling the cutting element in at least an outer circumferential section with an outer radius that continuously changes in the direction of rotation.

14. The apparatus according to claim 1, wherein the cutting ring has a flushing hole in at least an outer circumferential section with a substantially constant outer radius for removing chips generated during cutting.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The invention is described below, without restricting the general idea of the invention, based on exemplary embodiments in reference to the drawings, wherein we expressly refer to the drawings with regard to the disclosure of all details according to the invention that are not explained in greater detail in the text. In the following:

[0028] FIG. 1 shows a schematic perspective representation of the apparatus for processing cylinder walls of an internal combustion engine,

[0029] FIG. 2 shows a schematic exploded representation of the apparatus for processing cylinder walls of an internal combustion engine,

[0030] FIG. 3 shows a schematic, perspective representation of a cutting ring,

[0031] FIG. 4 shows a schematic perspective representation of the cutting element arranged on the cutting ring,

[0032] FIG. 5 shows a schematic front view of a holding apparatus with a cutting element, and

[0033] FIG. 6 shows a schematic sectional representation of a holding apparatus from FIG. 5 along line A-A.

[0034] In the drawings, the same or similar types of elements and/or parts are provided with the same reference numbers so that a re-introduction is omitted.

DETAILED DESCRIPTION OF THE INVENTION

[0035] FIG. 1 shows a schematic perspective representation of an apparatus 1 for processing cylinder walls of an internal combustion engine with a mandrel 2 and a number of cutting rings 3. The cutting rings 3 are arranged next to each other or after each other on the mandrel 2.

[0036] The schematic exploded representation of the apparatus 1 for processing cylinder walls of an internal combustion engine again illustrates the mounting of the cutting rings 3 on the mandrel 2. This is shown in FIG. 2.

[0037] The cutting rings 3 are arranged sequentially at the desired angle relative to the rotational axis 15 on the mandrel 2 where they are releasably fixed. The longitudinally axial extension of the mandrel 2 is selected so that all cutting elements 3 have precisely enough space there. The length in the direction of the rotational axis 15 of the cutting rings 3 lined up next to each other corresponds to the depth of the region of the cylinder wall in which the slits are introduced.

[0038] During the process of introducing slits into the cylinder wall, the mandrel 2 rotates, and the cutting rings 3 accordingly rotate about the rotational axis 15 that corresponds to the longitudinally axial direction, or respectively the longitudinal axis of the mandrel 2.

[0039] The maximum diameter of the cutting rings 3 is smaller than the inner diameter of the cylinder to be processed to enable the apparatus to easily enter into the interior of the cylinder to process cylinder walls of an internal combustion engine 1. To cut slits in the inner cylinder wall, the mandrel 2 rotates with the cutting rings 3 about the rotational axis 15. At the same time, the mandrel 2 is guided in a ring path so that the entire inner circumference of the cylinder to be processed is provided with slits. The ring path of the mandrel 2 can be a circular path; other ring paths are also conceivable.

[0040] By installing different cutting rings 3 on the mandrel 2 at different angles relative to each other from the rotational axis 15, the slit profile that is introduced at the height section of each individual cutting ring 3 into the cylinder wall can be varied. A plurality of slit profiles stacked on each other in the longitudinal axial direction of the cylinder can then be produced in the cylinder wall. This yields a further improvement of the adhesion properties of the coating layer on the inner cylinder wall.

[0041] FIG. 3 shows a schematic perspective representation of the cutting ring 3. The inner radius of the cutting ring 3 is substantially constant, wherein a groove runs at the middle height of the inner circumference. The outer circumference of the cutting ring 3 can be basically divided into three types of sections: (1) an outer circumferential section with a substantially constant outer radius that is termed the first circumferential section 7 in the following, (2) an outer circumferential section with an outer radius that changes continuously in the rotational direction 16 which is termed the second circumferential section 8 in the following, and (3) an outer circumferential section with an outer edge that run substantially in the radial direction that is termed the third circumferential section in the following. In the embodiment in FIG. 3, six first, second and third circumferential sections 7, 8 and 9 are provided in each case.

[0042] The cutting element is 4 is arranged at the transition between a second circumferential section 8 and a third circumferential section 9. The cutting element 4 is preferably substantially cuboid, wherein the surface of the cuboid arranged on the second circumferential section 8 is shaped so that it lies flat on this circumferential section. This preferably also holds true likewise for the placement of the side surfaces of the cutting element 4 on the third circumferential section 9. The second circumferential section 8 can also have a stepped change in the outer radius. Depending on the geometric design of the second and third circumferential section 8, 9, the cutting element 4 is designed to have a complementary shape with the surfaces that lie on the second and third circumferential section 8, 9. Only one cutting element 4 is shown in FIG. 3. However, up to six cutting elements 4 can be or are placed on the portrayed cutting ring 3, in particular always lying against the circumferential section 9, or respectively the surface 9.

[0043] A slit contour 5 is introduced in the surface of the cuboid cutting element 4 facing outward in a radial direction. An enlarged representation of the cutting element 4 is shown in FIG. 4. The slit contour 5 has a series of cutting edges 6 facing in a rotational direction 16 of the cutting ring 3. The cutting edges 6 of the cutting element 4 are arranged close enough to each other so that they introduce all of the required slits in the inner cylinder wall needed for the coating layer to adhere when the slit contour 5 comes in contact with the inner cylinder wall. Cutting grooves 14 are arranged between the cutting edges 6.

[0044] FIGS. 3 and 4 also show a number of cooling channel holes 10 that are drilled into the second circumferential section 8. The cooling channel hole 10 is arranged close to the cutting element 4 and is connected to the cooling channel 12 shown in FIG. 2 in a manner familiar to a person skilled in the art. A coolant is guided by the cooling channel 12 into the cooling channel hole 10 that exits in the proximity of the cutting element 4 from the cutting ring 3. Under the rotation of the cutting ring 3, the coolant is pressed against the cutting element 4, and the cutting element 4 is thereby cooled. The cooling channel hole 10 can be formed at an angle from the radial to the cutting element 4, or respectively in the direction of the circumferential section 9.

[0045] In addition to the cooling channel holes 10, the cutting ring 3 preferably has flushing holes 11 in addition or alternatively as shown in FIGS. 3 and 4. The flushing holes 11 are preferably each arranged in the first circumferential section 7.

[0046] The flushing holes 11 are connected to a flushing channel 13 (not directly visible in FIG. 2) that is arranged in the mandrel 2 in a manner familiar to a person skilled in the art. A flushing agent can be introduced into and/or removed from the flushing holes 11, wherein the flushing agent removes the chips arising during the cutting process and thereby prevents an interruption of the cutting process by these chips.

[0047] The flushing hole 11 can be designed radial or at an angle to the radial so that drainage or removal of chips from an outer region into an inner region of the cutting ring 3 is simplified. In the latter case, an angle between 10 and 60, in particular preferably between 25 and 45, is provided between the first circumferential section 7 and the flushing hole 11.

[0048] FIG. 5 shows a schematic front view of a holding apparatus 20 with a cutting element 4 arranged thereupon. The holding apparatus 20 can be fastened to the cutting ring 3 by means of a screw that is guided through the hole 21. The contour of the cutting ring 3 can be adapted to the contour of the holding apparatus 20. Preferably, the contours are shaped complementary to each other. In FIG. 3 and FIG. 4, on the one hand the contour of the cutting ring 3 would then be correspondingly adapted to the contour of the holding apparatus 20 and, on the other hand, the holding apparatus 20 with the cutting element 4 from FIG. 5 arranged thereupon would replace the cutting element 4 from FIGS. 3 and 4.

[0049] FIG. 6 schematically illustrates a cross-section along line A-A from FIG. 5. The holding apparatus 20 with the hole 21 is shown, as well as the location at which the cutting element 4 is attached. The cutting element 4 can have an undercut, or respectively a chamfer 22 for a better cut. Alternatively, the chamfer 22 can also be omitted, and a flat front surface can be provided.

[0050] All named features, including those taken from the drawings alone and individual features, which are disclosed in combination with other features, are considered alone and in combination as essential for the invention. Embodiments according to the invention can be fulfilled through individual features or a combination of several features. In the context of the invention, features which are designated with in particular or preferably are to be understood as optional features.

REFERENCE NUMBER LIST

[0051] 1 Apparatus for processing cylinder walls of internal combustion engines [0052] 2 Mandrel [0053] 3 Cutting ring [0054] 4 Cutting element [0055] 5 Slit contour [0056] 6 Cutting edges [0057] 7 First circumferential section [0058] 8 Second circumferential section [0059] 9 Third circumferential section [0060] 10 Cooling channel hole [0061] 11 Flushing hole [0062] 12 Cooling channel [0063] 13 Flushing channel [0064] 14 Cutting groove [0065] 15 Rotational axis [0066] 16 Rotational direction [0067] 20 Holding apparatus [0068] 21 Hole [0069] 22 Chamfer