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.

A roughening tool for roughening the cylindrical surface of a bore in a particular metallic workpiece, e.g. the piston running surface of a cylinder bore or cylinder liner in an internal combustion engine, by generating a defined microstructure of a plurality of circumferentially spaced apart circumferential microgrooves. The roughening tool has a tool main body which can be driven in rotation about an axis of rotation and a multiplicity of circumferentially cutting cutting tools arranged at a defined axial distance from one another on the tool main body. According to the invention, the cutting tools are each formed from a disc milling cutter and each disc milling cutter has at least one cutting element with a multiplicity of cutting teeth arranged at an axial distance from one another. In addition, a method for roughening a cylindrical surface.

An engine has a cylinder head defining an intake port with a roof defining first and second valve guide bores upstream of first and second siamesed intake valve seats for a cylinder. The head has first and second asymmetric fairings extending outwardly from the roof and positioned directly upstream of respective bores. Each fairing has an inner wall intersecting an outer wall along an upstream edge and an inclined planar roof wall extending between the inner and outer walls. A method of forming the cylinder head and engine is also provided by milling the fairings from a roof preform formed with the intake port of the head.

A method for working a wall of a cylinder of an internal combustion engine, in which peripheral grooves are machined into the wall, wherein at least one annular saw blade, which is provided on a circumference with a multiplicity of cutting teeth, is used for introducing the grooves, wherein the saw blade is moved so as to rotate about its longitudinal axis and on an annular path. A subsequent forming operation on the lands that are formed between neighboring grooves causes the formation of undercuts that can improve the connection of the wall of the cylinder to a subsequently applied coating layer.

A piston has a piston crown and a top land extending circumferentially around the piston crown, as well as a combustion bowl and at least one valve pocket machined therein. The valve pocket has a side wall and a bottom, and wherein the side wall extends at an angle of between 110 and 120 from the bottom. A method for forming such valve pockets in the piston crown includes machining the valve pockets with a rotating cutter having an inverted frustoconical shape such that an angle between a bottom of the cutter and a side wall of the cutter amounts to between 110 and 120.

A milling tool is disclosed. The milling tool may include an elongated body having a longitudinal axis and a plurality of cutting inserts. The cutting inserts may each have a cutting edge and a cutting radius and be coupled to the body and spaced along the longitudinal axis. One or more of the plurality of cutting inserts may be adjustable (e.g., mechanically adjustable) between first and second cutting radii. A difference between the first and second cutting radii may be at least 10 m. The milling tool may include cutting inserts having a plurality of different cutting radii. The milling tool may be configured to have a length that spans an entire height of an engine bore. The cutting inserts having different radii may compensate for dimensional errors in an engine bore diameter that occur when milling a deep pocket.

Provided is a machining apparatus capable of improving the positioning accuracy of a machining tool as compared to conventional machines. A machining apparatus 1 includes a rotating tool, a machining tool provided on an outer periphery of the rotating tool, and a spindle head adapted to rotatably support the rotating tool. The machining apparatus includes a driving portion configured to move the spindle head in a direction perpendicular to an axis of rotation R of the rotating tool, a position sensor configured to measure a position of the spindle head on a plane perpendicular to the axis of rotation R, and a control unit configured to control the driving portion so as to move the machining tool in a direction perpendicular to the axis of rotation R of the rotating tool on the basis of the position of the spindle head.

A rotary head plate having a first precision surface and a second precision surface. The rotary head plate mounted to the first sub fixture. A second sub fixture being able to freely rotate with the rotary head plate when rotated. A tailstock plate mounted to the second sub fixture. The tailstock plate having a first precision surface and a second precision surface, A first head plate attached to the first precision surface of the rotary head plate and the first precision surface of the tailstock plate. A second head plate attached to the second precision surface of the rotary head plate and the second precision surface of the tailstock plate. The first head plate and second head plate adapted to each receive two cylinder heads. The first head plate and second head plate each including at least one cylinder head opening.

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.

According to one aspect of this disclosure, a grooving tool is provided. The grooving tool has a body with a plurality of recesses. Plural inserts assembled into each of the recesses. The recesses include a cutting edge for forming grooves in an engine cylinder wall when rotated in one rotational direction. The insert also includes a peening surface extending in the opposite rotational direction from the cutting edge for deforming the upper edges of the grooves when rotated in an opposite rotational direction.