The invention relates to a double-sided drilling fixture for die-forged pistons and a double-sided drilling process thereof. It overcomes the defects of low efficiency and accuracy of the double-sided drilling operation for die-forged pistons in the prior art. The invention comprises a die-forged piston, a fixture base assembly, an upper load-resisting assembly and a lower expansion-resisting assembly. The upper load-resisting assembly is installed on the fixture base assembly and disposed above the die-forged piston. A fixation base, whose upper surface shape is the same as internal surface shape of the die-forged piston, is installed above the fixture base assembly. The die-forged piston is sleeved on the fixation base. The invention achieves simultaneous drilling on both sides of the two rear skirt surfaces of die-forged pistons and delivers quick clamping and automatic fixation, significantly reducing the difficulty in the assembly of drilling plate and workpiece and increasing the alignment accuracy.

The invention relates to a double-sided drilling fixture for die-forged pistons and a double-sided drilling process thereof. It overcomes the defects of low efficiency and accuracy of the double-sided drilling operation for die-forged pistons in the prior art. The invention comprises a die-forged piston, a fixture base assembly, an upper load-resisting assembly and a lower expansion-resisting assembly. The upper load-resisting assembly is installed on the fixture base assembly and disposed above the die-forged piston. A fixation base, whose upper surface shape is the same as internal surface shape of the die-forged piston, is installed above the fixture base assembly. The die-forged piston is sleeved on the fixation base. The invention achieves simultaneous drilling on both sides of the two rear skirt surfaces of die-forged pistons and delivers quick clamping and automatic fixation, significantly reducing the difficulty in the assembly of drilling plate and workpiece and increasing the alignment accuracy.

The invention relates to a method and an arrangement for machining a workpiece with a surface, into which a groove structure with grooves and interposed ribs is introduced, wherein undesirable burrs can develop on the groove structure. According to the invention, for testing and determining the formation of burrs a measuring means is provided which emits a light to the surface of the groove structure and receives light reflected from the surface, wherein a degree of the burr formation is determined depending on the reflected light.

The invention relates to a method and an arrangement for machining a workpiece with a surface, into which a groove structure with grooves and interposed ribs is introduced, wherein undesirable burrs can develop on the groove structure. According to the invention, for testing and determining the formation of burrs a measuring means is provided which emits a light to the surface of the groove structure and receives light reflected from the surface, wherein a degree of the burr formation is determined depending on the reflected light.

A cutting tool for removing material from an engine block structure includes an engine block structure support sized to receive the engine block structure, a platform having a longitudinal dimension and a width dimension, and a cutting assembly supported on the platform and movable in a longitudinal direction along an adjustable rail, and movable in a direction approximately orthogonal to the longitudinal direction, the cutting assembly including a rotary cutter. The cutting tool also includes an alignment mechanism including an engagement structure configured to secure the cutting assembly to one of a plurality of predetermined positions on the adjustable rail, and an adjustment mechanism for moving the adjustable rail and cutting assembly in the longitudinal direction to position the rotary cutter to a desired position.

A cutting tool for removing material from an engine block structure includes an engine block structure support sized to receive the engine block structure, a platform having a longitudinal dimension and a width dimension, and a cutting assembly supported on the platform and movable in a longitudinal direction along an adjustable rail, and movable in a direction approximately orthogonal to the longitudinal direction, the cutting assembly including a rotary cutter. The cutting tool also includes an alignment mechanism including an engagement structure configured to secure the cutting assembly to one of a plurality of predetermined positions on the adjustable rail, and an adjustment mechanism for moving the adjustable rail and cutting assembly in the longitudinal direction to position the rotary cutter to a desired position.

A cutting tool for removing material from an engine block structure includes an engine block structure support sized to receive the engine block structure, a platform having a longitudinal dimension and a width dimension, and a cutting assembly supported on the platform and movable in a longitudinal direction along an adjustable rail, and movable in a direction approximately orthogonal to the longitudinal direction, the cutting assembly including a rotary cutter. The cutting tool also includes an alignment mechanism including an engagement structure configured to secure the cutting assembly to one of a plurality of predetermined positions on the adjustable rail, and an adjustment mechanism for moving the adjustable rail and cutting assembly in the longitudinal direction to position the rotary cutter to a desired position.

A cutting tool for removing material from an engine block structure includes an engine block structure support sized to receive the engine block structure, a platform having a longitudinal dimension and a width dimension, and a cutting assembly supported on the platform and movable in a longitudinal direction along an adjustable rail, and movable in a direction approximately orthogonal to the longitudinal direction, the cutting assembly including a rotary cutter. The cutting tool also includes an alignment mechanism including an engagement structure configured to secure the cutting assembly to one of a plurality of predetermined positions on the adjustable rail, and an adjustment mechanism for moving the adjustable rail and cutting assembly in the longitudinal direction to position the rotary cutter to a desired position.

A method includes positioning a cylindrical tool having one or more rows of blades within a cylindrical bore having a surface, forming annular grooves and peaks into the surface with the grooving blades when the swaging blades are in the retracted position, and translating the swaging blades from the retracted position to the extended position to deform the peaks. The one or more rows of blades includes fixed grooving blades and translatable swaging blades having retracted and extended positions.

A cutting element for a tool to create a helically extending, trapezoidally undercut groove in a cylindrical surface of a bore. The cutting tool, preferably configured as a cutting insert, has groove-cutting teeth to create a symmetrically cross-sectioned groove which are arranged in series in a division harmonized with the pitch of the groove to be created. These groove-cutting teeth comprise at least one pre-machining tooth to create and machine a base groove and several trapezoidal teeth following the at least one pre-machining tooth, which have a tooth head profile which expands trapezoidally in cross-section in the vertical direction of the tooth with two flanks delimiting a flank angle for further machining the base groove to a trapezoidally undercut final cross-section. The flank angle delimited by the two flanks increases from at least one trapezoidal tooth to a following trapezoidal tooth to a defined final dimension.