JPH04116444A - Film tester - Google Patents

Abstract

PURPOSE:To quantitatively measure/evaluate a film without changing the characteristic of the film by a method wherein a steel ball is rolled while being pressure against the film, and the downward displacement of the steel ball towards the film is measured. CONSTITUTION:One end of a lever 11 is supported at a fulcrum 10, and a weight 12 is mounted at the other end of the lever 11. A rod 14 having a steel ball holding part 13 at the lower end thereof is rotatably mounted at the intermediate part of the lever 11. When the rod 14 is swayed by a crank 18 and a rod 16, a steel ball 9 is rolled against a film 2 on a supporting member 5. As the steel ball 9 encroaches to break the film 2, the position of the steel ball 9 and lower 11 is gradually lowered, which is detected by a displacement sensor 19. Accordingly, quantitative evaluation is achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a film testing machine used for evaluating the mechanical properties of a film, especially its peeling resistance.

[Conventional technology]

The mechanical properties of a film are important factors for the film to perform its functions, and in particular, the peeling resistance of the film is determined by the fact that the film is subjected to distortion or frictional force. This is an important indicator of whether or not it can withstand such loads.

However, the methods mainly used to evaluate peeling resistance have had the following drawbacks.

That is, as shown in FIG. 7 (al), the end face of the rod 3 is pasted on the surface of the film 2 with the adhesive 1, and the film 2 is peeled off by pulling or tilting it, and the force applied at that time is applied to the surface of the film 2. The adhesion test method that evaluates peel resistance by measuring with a peel resistance measuring device 4, etc. as shown in Figure (bl) has the disadvantage that it cannot be measured if the peel resistance of the film 2 is greater than the adhesive strength. If the film is porous, there is a problem in that the adhesive 1 that has soaked into the film affects the peeling resistance of the film 2.

In addition, as shown in FIG. 8, a spherical surface such as a spherical indenter 6 is pressed against the back side of the coating 2 supported by the support member 5 with a load indicated by the arrow, and the coating 2 is deformed into a convex shape to examine the fracture state. The cup test method for evaluating peeling resistance has the disadvantage that it is difficult to quantify and subject to subjectivity because it visually evaluates the peeling state, and it can only be evaluated on a film on a thin plate.

[Problem to be solved by the invention]

The present invention was made in order to solve the above-mentioned conventional problems, and by making the evaluation quantitative, it is possible to eliminate the subjectivity of the measurer, and it is also possible to evaluate the coatings observed on parts of various shapes. The object of the present invention is to provide a film testing machine that does not change the properties of the film upon measurement.

[Means to solve the problem]

As a means for solving the above problems, the film testing machine of the present invention is characterized by having a means for rolling a steel ball while pressing it against the film, and a means for measuring the displacement of the steel ball that decreases toward the film. The coating is destroyed by the high contact pressure generated when rolling a steel ball while pressing against the coating, and the rate at which the destruction progresses is measured to evaluate the peeling performance of the coating.

〔Example〕

An embodiment of the film testing machine of the present invention will be described below with reference to the drawings. First, the principle of evaluating the film 2 using this testing machine is as shown in Fig. 2. While applying a load to the film 2 on 7 and pressing it, move the arrow H with the drive trunk 8.
The peeling performance of the coating 2 is evaluated by making it reciprocate in the direction, destroying the coating 2 by the high contact pressure generated at this time, and measuring the speed at which the destruction progresses.

Next, in the testing machine of this embodiment, as shown in FIG. A rod 14 having a rod 13 at its lower end is movably supported by the middle part of the lever 11, and its end is swung by a crank 18 driven by a motor 17 via a rod 16. By doing so, the steel ball 9 is pressed against the coating 2 so that it does not fall.

As a result, the coating 2 is destroyed by the steel ball 9, and the steel ball 9 bites into the coating 2, causing the steel ball 9 and the lever 11 to break.
The position of ■ gradually decreases.

As a means for measuring the displacement of the drop, the embodiment has a displacement meter 19, which measures the position of the lever 11, converts the measurement result into a lever ratio, and calculates the steel ball. We are looking for the displacement of 9.

Next, Fig. 3 shows the displacement of the position of the steel ball 9 in the height direction with respect to the number of times the steel ball 9 is rolled, that is, the number of loads. The steel ball 9 then bites into the coating 2, and as a result, the position of the steel ball 9 is lowered.

Here, the decrease in the position of the steel ball 9 from point a to point a is approximately linear with respect to the number of loads, and the average rate of change in position during this period will be referred to as the film breaking rate.

Then, the dropping steel ball 9 reaches the base material of the coating 2, and the subsequent penetration of the steel ball 9 from this point depends on the strength of the base material.

Therefore, the rate at which the position of the steel ball 9 decreases from point a to point a, that is, the rate of film destruction, and the rate of decrease after point a are different.

Next, using the film tester shown in Figure 1, we tested four types of ceramics.
Using one of the x-ray radiation coatings A, B, and C,
A destructive test was performed by rolling a steel ball 9, and four types of tests were performed using a iron with different loads for each coating.

Films A and B used here had insufficient adhesion due to insufficient heat given during spraying, while films B and C were sprayed normally and achieved sufficient adhesion. This is what I did.

Therefore, Fig. 4 shows the above-mentioned films A,
The fracture speeds of films A and B are greater than those of films C and D, and it is possible to evaluate the difference in adhesion strength using the film tester of the present invention. It turns out that there is something.

Furthermore, in order to confirm this result, these films A,
B, C, and D were evaluated using a pin-on-disc friction test. The objects to be rubbed were films made of the same material from the same lot, and therefore films of the same character were to be rubbed against each other.

The principle of this test is shown in Figure 5, where the - part is indicated by the arrow R.
The rotating test piece 20 is a pin-shaped test piece that rotates, and the fixed-side test piece 21 is a disk-shaped test piece whose lower part is subjected to a vertical load in the direction of arrow l.

Furthermore, FIG. 6 shows the structure of the testing machine used in this test. The vertical load l is obtained by an air cylinder 22, and the rotating side test piece 20 is rotated by a motor 23 via a belt 24 and a clutch 25. , 26 in the figure is cooling oil, and 2
7 is a lubricant.

Furthermore, the above test conditions and measurement details are shown in the table below.

(Leaving space below next summer) The above test results are shown in the table below.
However, the coating CD was able to rub without any problems even under a load of 530 kg.

The cause of the seizure of films A and B is that the base material stainless steel was exposed due to the peeling of the films.
, B peels off more easily than films C and D, which is also supported by the results of the friction test.

〔Effect of the invention〕

As explained above, according to the film tester of the present invention,
Since the results of the film test are quantified, no skill is required for evaluation, and the results are not subject to subjectivity.

In addition, when testing using a testing machine, tests can be carried out regardless of the shape of the part as long as the film surface is flat, and the test can be performed without going through a process that changes the properties of the film, such as applying an adhesive, as in the past. It has the advantage that it can be implemented.

[Brief explanation of the drawing]

Fig. 1 is a side view of a film testing machine according to an embodiment of the present invention, Fig. 2 is a principle diagram of the method of evaluating the film by pressing a steel ball with the testing machine of Fig. 1, and Fig. 3 is the same as Fig. 1. Figure 4 is a diagram showing the displacement of the steel ball against the number of loads using the testing machine shown in Figure 1. Figure 4 shows the load and coating failure rate of the test using the testing machine shown in Figure 1 with four types of ceramic spray coatings. A line diagram showing the relationship between , Figure 5 is a principle diagram for testing the results of Figure 4,
Figure 6 is a partial cross-sectional side view showing the structure of the testing machine used in the test in Figure 5, and Figure 7 (al indicates the adhesion state of the test results used to evaluate the peeling resistance of conventional films). , Figure 7 (bl
FIG. 7 is an explanatory diagram showing the peeling state of al, and FIG. 8 is an explanatory diagram of a conventional cup test. 2... Film, 9... Steel ball, 11... Lever 12
... Weight, 17 ... Motor, 18 ... Crank,
19...Displacement meter.

Claims (1)

[Claims] A film testing machine having a means for rolling a steel ball while pressing it against a film, and a means for measuring the displacement of the steel ball that decreases toward the film.