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Surface examination device

A surface inspection device and machining technology, applied in measurement devices, image data processing, instruments, etc., can solve problems such as the inability to know the range and size of polishing residues, and the time spent in inspections.

Inactive Publication Date: 2014-07-02
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In this way, in the prior art, there is such a problem that only the degree of roughness of the entire inner surface of the cylinder bore can be known, but the range and size of the polishing residue cannot be known. As a result, it is necessary for the operator to visually find out where the polishing residue is, and it needs to be confirmed to make a judgment, and in addition, the inspection takes time

Method used

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Experimental program
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Effect test

no. 1 Embodiment approach

[0073] figure 1 It is a figure which shows the schematic structure of the cylinder bore inner surface inspection system 1 provided with the surface inspection apparatus 9 of this embodiment, and the cylinder block 5 in which the cylinder bore 3 which is an inspection object was formed.

[0074]The cylinder bore 3 is formed by a machining process in which a cutting tool protrudes radially from a boring head provided on a rotating shaft, and the boring head advances and retreats relative to the cylinder block 5 as a workpiece while rotating, that is, a so-called boring process. form. By this boring process, directional helical cutting marks can be formed on the inner surface 3A of the cylinder bore 3 . Thereafter, the inner surface 3A of the cylinder bore 3 is honed using a machining head equipped with a honing stone in order to obtain a surface roughness and a surface shape that allow the engine to exhibit desired performance while leaving oil pits.

[0075] The cylinder bore...

no. 2 Embodiment approach

[0112] In the prior art (JP-A-2004-132900), image processing is performed on a digital image covering the entire area of ​​the inner surface of the cylinder bore, which increases the time required for inspection and hinders improvement in engine productivity. In addition, when a foreign matter such as water droplets or dust is adsorbed on the inner surface of the cylinder bore, the foreign matter is reflected on a digital image and is erroneously determined as a defect.

[0113] Therefore, in this embodiment, the surface inspection device 209 that is not affected by foreign matter on the surface and can shorten the time required for inspection by reliably narrowing the area to be image processed will be described.

[0114] Figure 8 It is a diagram showing a schematic configuration of a cylinder bore inner surface inspection system 201 including a surface inspection device 209 according to a second embodiment of the present invention, and a cylinder block 5 in which the cylind...

no. 3 Embodiment approach

[0141] When cutting the bore of the cylinder block, the forward and backward speed of the boring turning tool relative to the cylinder block is not always constant. Therefore, since the pitch of the helical machining marks formed on the inner surface of the cylinder bore changes according to the advancing and retreating speeds, the directions of the machining marks are not uniform.

[0142] On the other hand, in the prior art (Japanese Unexamined Patent Publication No. 2004-132900), the change in the amount of reflected light obtained by scanning the sensor head depends on the difference between the scanning direction of the sensor head and the direction of the processing trace. offset. That is, when the sensor head is scanned along the direction of the processing mark, the change in the amount of reflected light is small, and the change in the amount of reflected light becomes larger as the angle intersecting the direction of the processing mark is closer to 90 degrees.

[0...

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Abstract

The presence or absence of deep machining marks can be detected, and their position and size can be estimated, so the inspection time can be shortened. A surface inspection device (9) for inspecting an inner surface (3A) of a cylinder barrel (3) formed by boring a cylinder block (5) and polished based on a digital brightness image (70) of the inner surface (3A) of the cylinder block (5) ), comprising: an image generating unit for evaluation (55), which generates an image in a direction perpendicular to the direction of the cutting mark P along the direction of the cutting mark P based on the digital brightness image (70). one-dimensional power spectrum images (71), and arranging them in parallel to generate an image for evaluation (73); and an evaluation unit (57), which evaluates each pixel value of each pixel of the image for evaluation (73). The presence or absence of polishing residue Q on the inner surface (3A) of the cylinder bore (3) is described.

Description

technical field [0001] The present invention relates to a surface inspection device for inspecting the surface of a machined workpiece. Background technique [0002] In the manufacturing process of automobiles, the cylinder block of the engine is cut and machined, and then the cylinder head, crankcase, etc. are attached to the cylinder block to assemble the engine. The cutting process of the cylinder bore is performed by a boring process in which a boring turning tool advances and retreats relative to the cylinder block while rotating to form the cylinder bore. Since boring processing is used for cutting the cylinder bore, spiral processing traces are left on the inner surface of the cylinder bore, so the processing traces can be used as channels for engine oil (oil pit, oil pit) . [0003] However, since the inner surface of the cylinder bore serves as the sliding surface of the piston, it is necessary to maintain the appropriate surface roughness and surface properties o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/954G01N27/90
CPCG06T2207/30164G06T2207/20048G01N21/954G06T7/0002G06T7/0004G01N27/90
Inventor 及川聪野条聪
Owner HONDA MOTOR CO LTD
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