Method for machining a crankcase and machining device

Abstract

A method for machining a crankcase includes providing a machining device. The machining device comprises a mechanical machining unit and a cooling/rinsing system, which is configured to cool and/or rinse the mechanical machining unit or a surface which is to be machined. The method also includes creating a structure in a cylinder wall of a crankcase using the mechanical machining unit. The method also includes using a fluid stream of the cooling/rinsing system to reshape at least certain regions of the structure.

Claims

1. A method for machining a crankcase, comprising the acts of: providing a machining device, wherein the machining device comprises a mechanical machining unit and a cooling/rinsing system, which is configured to cool and/or rinse the mechanical machining unit or a surface which is to be machined; creating a structure in a cylinder wall of a crankcase using the mechanical machining unit; and using a fluid stream of the cooling/rinsing system to reshape at least certain regions of the structure, wherein the fluid stream reshapes at least certain regions of the structure by plastically deforming the material.

2. The method according to claim 1, further comprising: generating at least one pulsed fluid jet configured to reshape the structure.

3. The method according to claim 2, further comprising: generating a fan fluid jet, wherein the fan fluid jet is a fluid jet oriented such that it is directed along a cylinder axis.

4. The method according to claim 3, further comprising: generating rectangular grooves using the mechanical machining unit.

5. The method according to claim 2, further comprising: introducing particles into the at least one fluid jet.

6. The method according to claim 2, further comprising: roughening the cylinder wall and/or the structure using the at least one fluid jet.

7. The method according to claim 1, wherein the structure is defined as a series of grooves and ridges.

8. A machining device for surface activation, comprising: a mechanical machining unit; and a cooling/rinsing system, wherein the mechanical machining unit is configured to generate a structure in a cylinder wall of a crankcase, and the machining device comprises an additional system, which is configured to use a fluid stream of the cooling/rinsing system in order to reshape the structure, wherein the fluid stream reshapes at least certain regions of the structure by plastically deforming the material.

9. The machining device according to claim 8, wherein at least one fluid outlet is provided circumferentially between cutting tools of the machining unit.

10. The machining device according to claim 9, wherein a plurality of fluid outlets are arranged in a row.

11. The machining device according to claim 8, wherein the mechanical machining unit further comprises a multiplicity of circumferentially distributed cutting elements.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic detail-specific view of a machining device, the mechanical machining unit of the latter engaging in a cylinder wall,

(2) FIG. 2 is a schematic view of a reshaping operation by means of a fluid jet, and

(3) FIG. 3 is a schematic view of one embodiment of a machining device.

DETAILED DESCRIPTION OF THE DRAWINGS

(4) FIG. 1 shows a partial view of a crankcase, in particular a cylinder wall 10, the reference sign Z denoting a cylinder axis. Reference sign 20 denotes a schematically illustrated detail of a cutting element of a mechanical machining unit of a machining device (not otherwise illustrated any more specifically), which is provided to create grooves 42 in the cylinder. The result is a series of ridges 44 and grooves 42 along the cylinder axis Z, this giving rise to a structure 40 being formed.

(5) FIG. 2, then, shows how the structure is, or in particular the ridges 44 are, reshaped or deformed via fluid jets 50, wherein on the one hand a surface of the cylinder wall 10 is roughened, it also being possible for this operation to be enhanced, if appropriate, by virtue of particles being introduced into the fluid jet or jets 50, and on the other hand the ridges 44 are reshaped to form undercuts.

(6) FIG. 3 shows, schematically, a machining device or a (tool) segment of a machining device, wherein the machining device comprises a mechanical machining unit which, in the embodiment shown here, has for example circumferentially arranged cutting elements 20. The latter have (not illustrated here) for example a comb-like profiling (cf. also FIG. 1) in order to generate grooves and ridges, as are depicted in FIGS. 1 and 2. The reference sign 52 denotes fluid outlets, which extend along an axis of rotation R of the machining device, or along a cylinder axis (not illustrated here), and are arranged circumferentially between the cutting elements 20. Via the fluid outlets 52, fluid jets are applied, preferably in pulsed form, to a cylinder wall, this making it possible to reshape a (e.g. mechanically) created structure, as depicted in FIG. 2. As mentioned above, the component which can be seen in FIG. 3 is, for example, a tool segment of a machining device, wherein the machining device can have a multiplicity of such tool segments one above the other along the axis of rotation R of the machining device. The internal cooling/rinsing system is not depicted anymore specifically. It is expediently possible for existing machining devices to be easily converted or for an additional system which is designed to use the fluid stream of the cooling/rinsing system to reshape the structure generated by the mechanical machining unit to be easily integrated in an existing system. Using the fluid stream of the cooling/rinsing system gives rise here, in particular, to the advantage that the system operates in a completely wear-free manner and can be easily readjusted, for example via the control parameters pulse frequency, pressure or amount of the particles in the fluid stream.

LIST OF REFERENCE SIGNS

(7) 10 Cylinder wall 20 Cutting element 30 Tool segment 40 Structure 42 Groove 44 Ridge 50 Fluid jet 52 Fluid outlet R Axis of rotation Z Cylinder axis