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Non-destructive internal inspection equipment “Arasamiru”

Non-destructive internal inspection equipment “Arasamiru”

While using dispensing nozzles for medical use, if the previous sample remains within the nozzles, the laboratory value changes and it is not possible to conduct an accurate sample analysis. The quality required for dispensing nozzles is that there are no scratches or unevenness on the interior of the nozzles so that no residual material is attached to them.

Traditional inner surface roughness test is destructive, which is measured by dividing the product by half, and it is a sampling inspection from the same manufacturing condition and production lot. On the other hand, by using endoscopes, the internal roughness of shipping nozzles themselves can be automatically measured, and scratches and residual materials can be detected. Nondestructive inner surface measuring deviceWe developed “Total inspectionThis is now possible.

External view of the inspection equipment

External view of the measuring system

Specifications of inspection equipment

  • ● Inner diameter of measured pipe: Φ0.45 to Φ2.0mm
  • ● Length of measured pipe: ~250mm
  • ● Outer Diameter of (mm) : Fiberscope η 0.35
    ~ Replace τ 1.2 according to the pipe radius
  • ● Device size : 1200 W × 400 D × 950 H
  • ● CCD camera: 0.3 million pixels monochrome
  • ● Select switch (feed pitch, number of measurements)
  • ● Measurement time: Approx. 2 seconds/pitch (including moving)

Result of the inner surface measurement

The pictures show measurement images of the inner surface of the pipe.
The reflected light changes based on the inner surface roughness. If there are scratches or residues, they shine brightly. Therefore, they will be judged from the images and defective products can be detected automatically.
Because it is used in the mass production process, measured images and data can be stored and traced by the server.

Clean (mirrored) Clean (mirrored)

【 Pipe 】

Shine whitish

Shine whitish

【 Ra 0.13 】

Shine a little

Shine a little

【 Ra 0.06 】

Appear dark

Appear dark

Operating method of the inspection equipment

  • 【1】Insert the fiberscope into a pipe and set it in the jig.
  • 【2】Press the start switch moves the fiber scope by 5mm and shoots 17 images continuously (arbitrarily set).
  • 【3】Collate the measurements with the data base and display the estimated surface roughness (e.g., Ra0 13) on the monitor.
  • 【4】If there are scratches or residues in the pipe, a buzzer will alert you to the NG judgment and display the image on the monitor.
  • 【5】Pull out the inspected pipe and press the reset switch to return the robot cylinder to the home position.

Video Introduction of the Non-destructive Interior Measuring Equipment “Alasamir”


● YouTube

History of “Arasamiru” Development


Our main business is precision and micro-processing, such as laser processing, small-sized pipe precision processing, and nozzle processing. We have responded to the diverse needs of our customers, especially in the medical and analytical fields. Based on the manufacturing technologies we have cultivated since our founding in 1917, we are also engaged in the development and design of core units at the request of major manufacturers, universities and research institutes.

We are also developing original equipment with the aim of improving in-house productivity and enhancing technological competitiveness. We have developed our original “Non-destructive Small-Diameter Pipe Inner Roughness Measuring Equipment” as part of our industry-university collaboration project.

Problem of conventional measurement of roughness of the inner surface of the pipe

In the medical and analytical fields, the internal roughness of small-sized pipes (smaller than φ1.5mm) is an extremely important issue that affects the results of the analysis. We have sophisticated polishing technology for the inner surface of the pipe, and we can finish it to the pipe inner surface roughness requested by the customer. Currently, it is possible to control the inner surface roughness of small-diameter pipes with an inner diameter of up to φ0.5mm.

Until now, however, the measurement of the roughness of the inside surface of the pipe has only been done by fracture inspection, which uses a surface roughness measuring instrument to expose the measuring surface by half-shaving the pipe. For this reason, the inner surface roughness requested by the customer could only be guaranteed by sampling inspection, and the pipe that actually arrived at the customer’s hand was not inspected on the inner surface. Development of a non-destructive measurement method for inner surface roughness was indispensable for total number assurance.

Industry-university collaboration project

During the period from December 2018 to November 2019, we and Kansai University worked on the theme of establishing mass production of high-quality, high-performance (anti-pollution, high-precision, and quantitative) nozzles and needles, making the most of their respective strengths. As a sub-theme, we worked to establish a non-destructive measurement method for internal surface roughness.

World’s first non-destructive pipe inner surface roughness measuring instrument

The basic principle is to insert a fiberscope smaller than the inner diameter of a small-diameter pipe (inner diameter φ0.5mm to φ1.5mm) into a small-diameter pipe, and calculate the surface roughness based on the correlation between the brightness information of the image on the inner surface and the measured data of the surface roughness and brightness acquired in advance.

We used to observe the inside surface of the pipe using another device manufactured in-house, and the idea that “I illuminate with the same light source and illuminance every time, but the pipe with a large roughness value has a bright image and a small roughness value has a dark image.” As a result, we succeeded in quantifying the image using AI system based on the industry academia cooperation with prof. Aoyagi, the Faculty of system engineering Kansai University.

In consideration of operability, the equipment configuration was controlled by a program so that when a pipe is set on an automatic control stage, pipe feeding by automatic movement of the stage and photographing of the inner surface of the small diameter pipe are performed sequentially and repeatedly.
Initially, the surface roughness of the image was calculated by transferring the data to the image processing software after acquiring the data of the inner surface. However, we have improved the image processing method so that the result of the inner surface roughness is displayed in real time by using the controller of the electric stage simultaneously.

Electric stage section

Electric stage section

Surface roughness calculation result display unit

Surface roughness calculation result display unit

“Non-destructive small-diameter pipe inner surface roughness measuring instrument” using this principle is the world-first technology, and we have applied for a patent for intellectual property protection.


We would like to express our sincere gratitude for tremendous cooperation and technical instructions by Kansai University.