摘要:
A film formation method in which a cylinder head rough material (3) having an annular valve seat part (16c), which is a film-deposited portion, and a nozzle (23d) of a cold spray device (2) are moved relative to each other along a film formation trajectory (T) in which a film formation starting point (P 2 ) and a film formation finishing point (P 5 ) of the film-deposited portion overlap to form an overlapping portion, and a coating film is formed on the film-deposited portion while a raw material powder is continuously sprayed from the nozzle, wherein the film is formed such that at the film formation starting point of the overlapping portion, an inclination angle ( θ ) of an end part of the coating film relative to a surface of the film-deposited portion is 45° or less.
摘要:
A method for processing a cylinder block is disclosed, wherein a protrusion protruding toward a crankcase is provided at a crankcase-side edge of a cylinder bore and a sprayed coating is formed on an inner surface of the cylinder bore and an inner surface of the protrusion continuous with the inner surface of the cylinder bore. After forming the sprayed coating, at least part of the protrusion is removed together with the sprayed coating formed on the inner surface of the protrusion. Accordingly, even in the case of removing the edge portion of the cylinder bore on the crankcase side, a sufficient margin to be removed can be ensured while a reduction in size of the cylinder block is achieved.
摘要:
When forming valve seat coats at opening portions (16a 1 to 16a 8 ) of intake ports (16) provided at a cylinder block mounting surface (12a) of a semimanufactured cylinder head (3), the nozzle of a cold spray apparatus moves along a nozzle movement path for air intake (Inpl) that is set between any two of the plurality of opening portions (16a 1 to 16a 8 ), while continuing to spray a raw material powder. When forming valve seat coats at opening portions (17a 1 to 17a 8 ) of exhaust ports (17), the nozzle moves along a nozzle movement path for air exhaust (Enpl) that is set between any two of the plurality of opening portions (17a 1 to 17a 8 ), while continuing to spray the raw material powder.
摘要:
In a method for manufacturing a cylinder block provided with cylinder bores, the cylinder block is held by a clamp device, stress is generated in the cylinder block by a holding force of the clamp device to duplicate deformations of the cylinder bores after assembling bearing caps thereon, boring is carried out with the cylinder bores deformed in a condition where the stress is generated, and a thermally sprayed coating is formed, after the boring, on each inner surfaces of the cylinder bores deformed in the condition where the stress is generated. According to the method for manufacturing a cylinder block, superior cylindricity, after assembling the bearing caps, of the cylinder bores on each of which the thermally sprayed coating is formed can be brought, and workability degradation of finishing works (honing) for each inner surface of the cylinder bores (thermally sprayed coatings) can be restricted.
摘要:
Provided is a defect detection device (1) capable of measuring the volume of surface defects. The defect detection device (1) includes: an imaging device (3) configured to image an image of an inspection object; a binarization processing unit (11) configured to subject the image to first and second binarization processing by use of different first and second binarization thresholds, so as to calculate first and second sizes for an identical defect in the image; a ratio calculation unit (12) configured to calculate a first ratio of the second size to the first size; and a depth determination unit (13) configured to determine a depth of the defect depending on the first ratio.
摘要:
A cylinder block manufacturing method including: machining an inner surface of a cylinder bore (3) of a cylinder block (1) into a first shape different from a target shape before a bearing cap (7) is attached to the cylinder block (1) so that the inner surface of the cylinder bore (3) is deformed into the target shape by attachment of the bearing cap (7) to the cylinder block (1); and forming a thermal spray coating (5) on the inner surface of the cylinder bore (3) having the first shape.
摘要:
The present invention comprises at least a pedestal (45) on which a cylinder head (12) is placed in a predetermined orientation, a base plate (26) disposed in a position away from the cylinder head, a rotation means (29) that causes the base plate to rotate about a rotational axis (C), a spray gun (23) mounted on the base plate so that a spray direction is directed toward the rotational axis, a high-pressure pipe (21b) which guides a working gas to the spray gun, and a rotating joint (21k) provided to a base end of the high-pressure pipe, the high-pressure pipe being arranged along the rotational axis.
摘要:
A film forming method for forming a coating film on a workpiece (3) having a plurality of film-deposited portions (16c) which are not continuous with each other by moving a nozzle (23d) of a cold spray device (2) relative to each other along a continuous movement trajectory (MT) including trajectories (T) of the plurality of film-deposited portions and a connecting trajectory (CT) linking the trajectories of the plurality of film-deposited portions while continuously spraying a raw material powder from the nozzle and the raw material powder is sprayed by cold spraying to form a coating film on each of the film-deposited portions, wherein a turnback point (TPi) where a relative speed between the workpiece and the nozzle decreases in the movement trajectory is set on the connecting trajectory.
摘要:
The nozzle for cold spray (25) used in a cold spray apparatus (2) is configured to include a tubular nozzle main body (252) and a cooling jacket (253) that surrounds the nozzle main body (252) to form a flow path (25e) for refrigerant (R) between the nozzle main body (252) and the cooling jacket (253). The cooling jacket (253) is provided with a seal retaining portion (253c) that retains an O-ring (253b) for the flow path (25e). The seal retaining portion (253c) and the nozzle main body (252) are joined in a socket-and-spigot joint fashion.