JPH0332002B2 - - Google Patents

Description

[Detailed description of the invention] <Object of the invention> Industrial application field The present invention relates to a method for measuring surface roughness, and in detail,
The present invention relates to a surface roughness measurement method that can easily and efficiently measure the surface roughness of any object, not just mechanical parts, metal products, or semi-finished products.

Conventional technology In general, the surface roughness and roughness profile of mechanical parts such as rolls and gears, as well as solid objects such as semi-finished products, are measured by directly scanning the measurement surface of the object using a stylus-type measuring device. I am doing it. This measurement method requires measurement under adverse conditions such as vibration and dust when the object to be measured cannot be moved, such as when it is a large and heavy object. Measurement is difficult, and in particular, measurement of curved surface roughness has the drawback that it is necessary to manufacture a special jig, for example, a jig that matches the curvature of the curved surface.

Problems to be Solved by the Invention The present invention aims to solve the above-mentioned drawbacks,
Specifically, when measuring the roughness of a curved surface, there is no need to create a measuring device that matches the curvature of the curved surface.Moreover, even large and heavy objects can be transferred onto an extremely thin film on-site and then transferred. We propose a surface roughness measurement method that can be expanded and measured on a flat surface.

<Structure of the Invention> Means for Solving the Problems and Their Effects That is, the method of the present invention involves bringing a polymer film whose surface has been treated to a semi-molten state into contact with a surface to be measured, and applying the above-mentioned effects to the polymer film. The method is characterized in that after the surface shape of the surface to be measured is transferred, the transferred surface of the polymer film is scanned with a stylus.

Therefore, according to the method of the present invention, a replica for measuring roughness can be prepared by simply using a polymer film such as acetyl cellulose film and a small amount of solvent that makes the surface of the film semi-molten, which is superior to the conventional method. The liquid resin does not flow when making a replica, making it easy to make a replica.

In addition, the curing time of the polymer film surface is 0.5~
A replica for measurement can be produced in a short, simple, efficient and inexpensive manner in as little as 5 minutes.

Therefore, to explain more specifically the configuration and its operation as a means to solve this problem,
It is as follows.

Replicas for roughness measurements are sometimes made by measuring and mixing appropriate amounts of resin and hardening agent and pouring a liquid resin into the measurement area, but in this case, it is necessary to surround the measurement area with clay, etc., and the preparation is necessary. It takes a considerable amount of time. In this respect, the method of the present invention uses a polymer film such as acetyl cellulose instead of a liquid resin. That is, in general, films are considered to be soft, and it is considered difficult to measure the roughness by directly placing a stylus on the film. However, among films, polymer films, especially acetyl cellulose, hard vinyl chloride, polystyrene, etc., are themselves relatively hard;
We focused on the fact that by gluing this to a hard flat surface, we could even measure the roughness of curved surfaces.

Furthermore, by making these polymer films thin, it is possible to measure the roughness and profile of not only flat surfaces but also curved surfaces. Furthermore, the surface of the polymer film can be easily semi-melted using a small amount of solvent, and the drying and hardening time of this surface is short, allowing measurement to be performed in a short time (5 minutes or less). Then, if the surface is left in a semi-molten state, it has the effect of adhering the polymer film to the target object, and the polymer film can be attached from a direction perpendicular to the surface to be measured, allowing stylus measurement. Sometimes, by adhering a polymer film to a hard flat surface such as glass, accurate measurements can be made without the polymer film becoming undulating due to curling or the like.

As described above, in the method of the present invention, the roughness of the surface to be measured is not directly measured as in the conventional example, but the surface roughness is reproduced using a polymer film. Acetyl cellulose film is most suitable as this polymer film, but any other film may be used as long as it has appropriate hardness, is thin, and has excellent volatility; for example, hard vinyl chloride film may be used. , polystyrene, etc. can be used. The thickness of this polymer film does not need to be particularly limited as long as it is adapted to the surface to be measured and can be easily bent, but it is preferably 0.010 mm to 0.200 mm from the viewpoint of reproducibility of surface roughness and ease of operation.

Therefore, in order to actually reproduce the surface roughness using such a polymer film, the surface to be measured is first degreased and cleaned, while the surface of the polymer film is treated to a semi-molten state. This treatment is carried out by dipping the polymer film in a suitable solvent until the surface becomes semi-molten.The solvent may be any organic solvent that can dissolve the surface of the polymer film. Can be used. For example, in the case of acetyl cellulose film, acetate esters such as methyl acetate, ethyl acetate, butyl acetate, dimethyl formamide, etc. are usually used, and in particular, when the surface temperature to be measured is 40°C or less, methyl acetate, roll surface If the temperature of the surface to be measured is
When the temperature is 40°C or higher, for example, dimethylform is used for hard vinyl chloride, and dimethylformamide, benzene, toluene, or acetate is used for polystyrene.

Next, a polymer film whose surface has been treated to have a semi-molten state is attached to the degreased and cleaned surface to be measured.

In this state, after the solvent has completely volatilized, the polymer film is peeled off from the surface to be measured, usually every 0.5 to 5 minutes. In addition, if there is any adhesion on the polymer film, the processes such as gluing and peeling of the polymer film are repeated until the adhesion is removed.

Next, the surface roughness transfer surface of the peeled polymer film is placed on the front side, the back side is attached to a smooth glass plate using double-sided adhesive tape, etc., and the sample is measured by scanning with a stylus using a roughness meter. However, at this time,
Since it is a one-stage replica, the roughness is measured by reversing the unevenness of the obtained roughness profile.

Example Next, examples will be described.

Example 1 We prepared 10 samples with different roughness, and compared the case where the same surface to be measured was directly measured with a roughness meter as in the conventional example, and the case where it was measured using the method of the present invention. The results shown in FIG. 1 were obtained (in FIG. 1, the solid line represents the regression line, and the dotted line represents the case where they completely matched). In addition, in the method of the present invention, an acetyl cellulose film (thickness 0.034 mm) is used as the film, and this is diluted in methyl acetate.
The surface is immersed for ~3 seconds to pre-melt it, then pasted on the surface to be measured for 2 minutes and peeled off to create a replica, which is then measured with the same roughness meter as the conventional example by reversing its roughness profile. This is what I did.

Comparing the roughness Ra according to the present invention method shown on the vertical axis in FIG. 1 and the roughness Ra' according to the conventional method shown on the horizontal axis, it can be seen that the two agree and match well.

Example 2 Changes in the roughness profile of a 680φ x 2000 work roll before and after finishing hot rolling with the progress of rolling were measured by the method of the present invention, and the results shown in FIG. 2 were obtained. In Figure 2, vertical 0, 1,
5, 10, 25, 40, 71, and 100 are numbers indicating the degree of rolling progress, the horizontal symbol A indicates the surface roughness in the roll axis direction, and B indicates the surface roughness in the roll circumferential direction. In addition,
In this case as well, measurements were made in the same manner as shown in Example 1, but the thickness of the acetyl cellulose film used was 0.08 mm, the immersion time in methyl acetate was 2 to 3 seconds, and Scale W ₁ is 5μm,
_W2 is 5 μm.

As is clear from FIG. 2, in the conventional example, surface roughness in the circumferential direction of the roll cannot be obtained, but according to the method of the present invention, surface roughness in the circumferential direction of the roll can also be obtained from the transferred replica.

<Effects of the Invention> As explained in detail above, the method of the present invention involves attaching a polymer film whose surface is semi-molten to a surface to be measured, transferring the surface texture of the surface to be measured onto the polymer film, and transferring the surface texture of the surface to be measured onto the polymer film. This method measures the surface roughness by using a stylus on the molecular film transfer surface.

Therefore, unlike conventional methods, the surface roughness of the surface to be measured is not measured directly by using a stylus, and since it is extremely simple and quick to create a replica by film transfer, it can be used under extremely harsh conditions. It is possible to measure roughness even in places where there is only a small gap and it is difficult to measure directly. Since a replica can be made using an extremely thin polymer film, it is possible to transfer any shape of the surface to be measured, such as a curved surface.In particular, since it can be developed into a flat surface during measurement, Curved surface roughness can be measured with the flat surface roughness meter used.

In addition, an inexpensive acetyl cellulose film or the like is sufficient as the polymer film, and the amount of solvent required is small, so a replica for roughness measurement can be produced at a very low cost. Furthermore, the solvent used to semi-melt the surface acts to bond the polymer film to the surface to be measured, and does not flow like liquid resin, so even if the surface to be measured is oriented vertically. , measurement can be performed regardless of the angle of the surface to be measured.

[Brief explanation of drawings]

Figure 1 is a graph comparing the surface roughness measured directly by the conventional method and the method of the present invention. 3 is a graph showing changes in roughness profile as rolling progresses, measured by the method of the present invention. Symbols W ₁ , W ₂ ... Vertical and horizontal scales.

Claims (1)

[Claims] 1. Treat a polymer film of cellulose acetate, hard vinyl chloride, or polystyrene so that its surface becomes semi-molten, then bring this semi-molten surface into contact with the surface to be measured, and then harden the semi-molten surface. A surface roughness measuring method characterized by peeling off a polymer film from a surface to be measured, transferring the surface shape of the surface to be measured onto the polymer film, and scanning the transferred surface with a stylus.