JPH07104122B2 - Gap measurement method using pressure sensitive paper - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a gap between parts, and more particularly to a method for measuring a gap amount generated on a mating surface of a combination part.

[Prior Art] Conventionally, the following method has been used as a means for measuring a gap between mating surfaces of a combination component.

(1) The shape of the combination surface is individually measured individually, and the gap at the time of combination is estimated from each measurement result.

(2) One of the combined surfaces for which the gap is to be measured is thinly and uniformly coated with a solution of a pigment called red lead or a blue bamboo in oil, and the combined surfaces are closely adhered to each other. The amount of the gap is judged and evaluated based on the density of the attached pigment.

[Problems to be Solved by the Invention] However, the conventional gap measuring method has the following problems.

(1) In the method of measuring the shape of the combined surface by a single item, it is difficult to grasp the surface shape of the single elements in three dimensions,
It is even more difficult to estimate the gap in the combined state.

(2) In the method of measuring by transfer of pigment, the thickness of the pigment varies depending on the amount of oil added to the pigment used and the coating method, and the pressing force at the time of combination also varies depending on the operator. There is a tendency for variations in the determination of. In addition, since the numerical value of the gap is a sensory evaluation performed based on the experience and intuition of the operator, even the same operator has a large variation in the value and cannot perform a quantitative evaluation because it is a manual operation.

The present invention focuses on the above-mentioned conventional problems, and aims to provide a highly accurate quantitative measurement method by eliminating human work and artificial judgment.

[Means for Solving the Problems] In order to achieve the above object, a gap measuring method using a pressure-sensitive paper according to the present invention includes a pressure-sensitive paper that develops a color when pressed and is sandwiched between objects to be measured. The density of the color developed by applying pressure to the measurement object was converted into the amount of the clearance between the objects to be measured using a previously created relational chart of the color density and the clearance amount.

[Operation] According to the configuration described above, the amount of the gap is obtained by reading the shade of the color of the pressure-sensitive paper sandwiched between the components, so that the amount of the gap between the components is quantitatively and highly accurately measured. be able to.

Example An example of a gap measuring method using the pressure sensitive paper according to the present invention will be described in detail below with reference to the drawings.

The pressure-sensitive paper originally detects the pressure distribution based on the shade of color development, and the pressure-sensitive paper used in the present invention is composed of two sheets of paper each having three layers as shown in FIG. Is a support 1a, an intermediate layer 1b, and a microcapsule 1c containing a color-forming agent.
When the microcapsules 1c of the paper 1 are destroyed by pressure when the color developer 2a is applied instead of the color developer, the color developer is adsorbed by the color developer 2a of the other paper 2 to cause a chemical reaction to develop color. To do. The relationship between the pressure and the color density is as shown in FIG. 2. The higher the pressure, the greater the degree of destruction of the microcapsules containing the color former, and the higher the color density. Further, the relationship between the size of the gap and the pressure applied to the pressure sensitive paper is conceptually shown in FIG. From this, as a result of investigating the relationship between the size of the gap and the color density, it was as shown in FIG. 4, and it was confirmed that the color density of the pressure-sensitive paper could be converted into the gap amount.

Therefore, as shown in Fig. 5, two test pieces with a diameter of 100 mm and a thickness of 15 mm, both sides of which were lapped to a flatness of 0.5 μm or less, were produced. Of these, one test piece 3 had a maximum of 65 μm at the center of one side. The concave portion 3a is provided so that a gap of 65 μm can be formed at the time of combination.

Insert pressure sensitive paper 1 and 2 between the above two test pieces 3 and 4,
As shown in FIG. 6, the urethane rubber 5 is arranged on the upper and lower sides of the test pieces 3 and 4, and 1000 kg is obtained by using an Amsra tester.
Was applied to cause color development on the pressure-sensitive paper. As shown in FIG. 7, this pressure-sensitive paper is a measuring system (pre-scale measuring system manufactured by Fuji Photo Film Co., Ltd.) including a measuring unit (scanner) 6, an output device 7, an arithmetic unit 8 and a monitor 9.
The color density distribution was measured by. This color density distribution data is converted into gap amount data by a conversion software created based on the color density-gap amount conversion graph shown in FIG.
The gap amount distribution chart shown in FIG. 8 was obtained.

Although the measurement of the gap amount between the parts is described in the present embodiment, the present invention is not limited to this. For example, when measuring the flatness of a specific part, it is necessary to measure the flatness between a standard piece having a reference flat surface and an object to be measured. By sandwiching the pressure-sensitive paper and pressurizing both with a constant pressure, the flatness of the measured object can be quantitatively obtained.

EFFECTS OF THE INVENTION As described above, according to the present invention, the characteristics of pressure-sensitive paper are utilized to mechanically calculate the gap between the components from the color density, so that the actual combination of the components is substantially the same. It is possible to quantitatively obtain a precise gap amount with high accuracy and shorten the gap measurement time as compared with the conventional method.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the coloring principle of pressure-sensitive paper, FIG. 2 is a graph showing the relationship between pressure and color-developing density, and FIG. 3 is a graph conceptually showing the relationship between gap amount and pressure applied to pressure-sensitive paper. , 4th
FIG. 5 is a graph showing the relationship between the gap amount and color density, FIG. 5 is a perspective view of the test piece used in the embodiment, FIG. 6 is a sectional view when the test piece is pressed, and FIG. 7 is color density distribution. FIG. 8 is a perspective view of the measuring system, and FIG. 8 is a gap amount distribution diagram in the test piece. 1,2 …… Pressure sensitive paper 3,4 …… Test piece

Claims (1)

[Claims] 1. A pressure-sensitive paper that develops color when pressed is sandwiched between objects to be measured, and the shade of the color produced by applying pressure to the object to be measured is a correlation between a previously created color density and a gap amount. A gap measurement method using pressure-sensitive paper, characterized in that the amount of gap between measured objects is converted using a table.