JPH0522810Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a flatness measuring device for measuring the flatness of a flange formed around the opening of a container-shaped workpiece.

[Conventional technology]

A connecting flange is integrally formed around the opening,
In a container-like workpiece in which a sealed container is constructed by connecting multiple parts to the flange and contains a fluid therein, it is desirable that the flange be formed as flat as possible in order to maintain sealing performance.

For example, an oil pan 1 to be assembled into an automobile engine is formed by press molding into the shape shown in FIG. 4, and the flange 2 is formed flat. This oil pan 1 has a flange 2 hermetically assembled to the lower surface of a cylinder block (not shown) via a suitable molded gasket or liquid gasket.

Since the gasket has appropriate elasticity and thickness, it can absorb machining errors of the flange 2 of the oil pan 1 to some extent. However, the range that can be absorbed is limited, and if the flange 2 is deformed beyond the permissible range of the gasket, the airtightness will be impaired and oil leakage will occur, which will have a major negative impact on the engine.

Therefore, after the oil pan 1 is press-molded, the flatness of the flange 2 is measured. Measurement of flatness is
As shown in Fig. 5, the oil pan 1 is placed upside down on a measuring plate 3 whose upper surface is formed into a highly accurate flat surface, and the flange 2 is measured with a constant torque using a plurality of bolts 4, 4... The oil pan 1 was assembled to a panel 3, and the gap between the flange 2 and the upper surface of the measuring panel 3 was measured around the entire circumference of the oil pan 1 using a thickness gauge 5 having a predetermined thickness to determine whether it was good or bad.

[The problem that the idea aims to solve]

With the above measurement method, it takes a long time (approximately 15 minutes) to measure one oil pan 1, so it is not possible to conduct a 100% inspection on the 600 to 700 oil pans produced per hour. In the past, sampling inspections were carried out at a rate of one out of several hundred products, which sometimes resulted in defective products being mixed into the products.

This invention aims to provide a measuring device that can easily measure the flatness of a flange in a short time.

[Means to solve the problem]

The flatness measuring device in this invention consists of a measuring plate that rotates with a container-shaped workpiece placed upside down, and a light projector and a light receiver that transmit and receive light between the center and the outer periphery on the top surface of the measuring plate. and a measuring device that measures the gap between the container-shaped workpiece and the measuring board based on the amount of light received by the light receiver.

[Action]

In the flatness measuring device, a workpiece placed in a container is placed on a measurement plate in a downwardly facing state, and the measurement plate is rotated, and light is emitted from a light emitter to a light receiver. Then, the light leaking through the gap between the container-shaped workpiece and the measurement board is received by the receiver, and from the amount of light received, the measuring device measures the gap between the light emitter and the receiver, and the gap is measured all around the container-shaped workpiece. By measuring, the flatness of the opening of the container-shaped workpiece is measured. If even one of the gaps is larger than a preset value, the container-shaped workpiece is determined to be defective.

〔Example〕

Embodiments of this invention will be described below with reference to FIGS. 1 to 3.

In Figures 1 and 2, 10 is the base;
A hollow support 11 is erected and fixed at the center, and a support plate 12 is attached to the top of the support 11. Reference numeral 13 denotes a measuring plate, which is formed into a ring shape large enough to place the container-shaped workpiece (oil pan) 1 to be measured, and whose upper surface is formed into a highly accurate flat surface. This measurement board 13 is loosely fitted to the support column 11, and the bearing 1 is placed on the support plate 12.
4, 14... are rotatably supported. 15 is a floodlight attached to the upper end of the support column 11;
Light is projected in the radial direction along the upper surface of the measurement panel 13. Reference numeral 16 denotes a light receiver installed outside the measurement panel so as to face the light projector 15, and receives the light from the light projector 15. 17 is a measuring device that measures the gap between the measurement board 13 and the workpiece 1 based on the amount of light received by the light receiver 16. For example, it digitally displays the determined gap dimension on the display window 18, and if the gap is within a specified value. For example, a green lamp 19 is turned on, and if the value is outside the specified value, a red lamp 20 is turned on and a buzzer 21 is sounded at the same time. The measuring device 17 may be used, for example, if there is a gap.
If it is 0.10mm, it will display a digital value of 9.13, and 0.11
If it is mm, it will display 9.06.

For example, when measuring the flatness of the flange 2 of the oil pan 1, if the specified value is 0.10 mm, the above measuring device sets the digital value 9.13 as the measurement standard on the measuring device 7, and the obtained value is 9.13 or more. That's fine,
If it is less than 9.13, it is considered defective. And when measuring,
The oil pan 1 is placed in a downward state on a measuring board 13, and a light projector 15 inside the oil pan 1 emits light outward. Then, if a gap is created between the flange 2 of the oil pan 1 and the measurement panel 13 between the light emitter and receiver 15 and 16, the gap 2 will be caused as shown in FIG.
2, the leaked light is received by the light receiver 16, an electrical signal corresponding to the amount of light received is sent from the light receiver 16 to the measuring device 17, a digital value corresponding to the gap is determined, and the light is displayed on the display window 18. will be displayed. If the determined value is greater than or equal to the specified value, a green lamp 19 is turned on, and if it is less than the specified value, a red lamp 20 is turned on and a buzzer 21 is sounded. Then, the gap between the flange 2 and the measuring plate 13 is measured over the entire circumference of the oil pan 1 by slowly rotating the measuring plate 13 360° manually or using an appropriate drive mechanism (not shown). If the value is less than the specified value at even one point during one rotation, the oil pan 1 under measurement is determined to be defective.

In the above embodiment, the light projector 15 is placed in the center of the measurement panel 13, and the light receiver 16 is placed outside, but the arrangement may be reversed.

Furthermore, the above measuring device can also measure the flatness of various workpieces other than oil pans.

[Effect of idea]

According to this invention, by placing the container-shaped workpiece upside down on the measuring board, emitting light from the projector, and rotating the measuring board once, the flatness of the opening can be checked over the entire circumference of the container-shaped workpiece. The measurement work is greatly simplified and measurements can be made in a short time. Therefore, if this measuring device is used to measure the flatness of an oil pan flange, it will be possible to measure it in a short time, and it will be possible to measure all produced oil pans and eliminate defective products. Reliability is greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the measuring device according to the present invention, Fig. 2 is a front view thereof, Fig. 3 is an enlarged sectional view of main parts showing the measurement principle, Fig. 4 is a perspective view of the oil pan, and Fig. 5 is a perspective view of the oil pan.
The figure is a perspective view showing a conventional measurement method. 13... Measuring panel, 15... Emitter, 16... Light receiver, 17... Measuring device.

Claims (1)

[Scope of utility model registration request] A measurement board that rotates with a container-shaped workpiece placed upside down, a light emitter and a receiver that transmit and receive light between the center and the outer periphery on the top surface of the measurement board, and a system that measures the amount of light received by the receiver. An apparatus for measuring the flatness of an opening of a container-shaped workpiece, comprising a measuring device for measuring a gap between the container-shaped workpiece and a measuring plate.