JPS5939681B2 - Hole penetration detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The fluid of the present invention is used to detect whether an oil hole drilled in a cam part of a camshaft, for example, is penetrated by a child L provided in communication with a hollow part of an object to be detected. This sensor was developed based on the collision type of the opposed type sensor, and the fluid is ejected from the hole in the object to be detected and the opposed nozzle installed opposite it, and the two fluids collide. Relates to conducting penetration inspection.

Conventionally, in addition to the method of inserting a rod into the hole to detect penetration of a hole, there are methods such as injecting fluid into the hollow part of the object to be detected and measuring the back pressure on the injection side, or visually checking the fluid ejected from the hole. It was hot.

However, these methods generally require a hole penetration detection process in addition to the production process, resulting in poor production efficiency and poor reliability. SUMMARY OF THE INVENTION An object of the present invention is to detect hole penetration with high reliability during the production process, and the configuration of an embodiment of the present invention will be explained below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an object to be detected, which has a hollow part 2 and a hole 3 communicating with the hollow part 2, and is supported by a center 4 and a hollow center 5 having a fluid passage facing thereto.

Reference numeral 8 denotes a facing nozzle, which is provided on the extended axis of the hole 3 of the object 1 to face the hole 3 .

T is a pipe through which fluid is fed, one end of which is connected to the opposed nozzle, and a pressure regulating valve 6 and a pressure increase detection section 9 are provided in the middle. A logic circuit section 10 is connected to the pressure increase detection section 9 to obtain a detection output.

In the configuration described above, fluid is supplied to the opposing nozzle 8 through the pipe □, and the pressure rise detection section 9 detects the fluid pressure.

Further, fluid is supplied to the hollow portion 2 of the object to be detected 1 through the fluid passage of the hollow center 5. As a result, if the hole 3 is penetrating, the fluid ejected from the opposing nozzle 8 collides with the fluid ejected from the hole 3 to form a collision surface, thereby increasing the fluid pressure in the pipe 7. Pressure rise detection section 9
is detected.

Furthermore, if the hole 3 is not penetrated, the fluid ejected from the opposing nozzle 8 will not form a collision surface, so the pressure of the fluid in the pipe T will not increase, and the pressure increase detector 9 will not detect the pressure increase. First, it is detected that the hole 3 of the object to be detected 1 is not penetrated.

Therefore, in this embodiment, when the fluid is constantly flowed out from the opposed nozzle 8 and the fluid flows into the hollow part 2 of the detected object 1, it is determined whether or not a pressure increase occurs in the pressure increase detection part 9. Penetration detection of the hole 3 of the object 1 to be detected can be performed.

Next, a case in which the plurality of holes 231 and 232 of the object to be detected 21 are not lined up in a straight line parallel to the axis of the object to be detected 21 will be described with reference to FIG.

The object to be detected 21 has a hollow part 22 and holes 2, 31, 2 on the tube.
32 and is supported by a center 24 and a hollow center 25. Also, the hole 231 at any rotational position of the detected object 21 which is supported by the centers 24 and 25 and rotates.
, 232, opposing nozzles 281 and 282 with bowl-shaped openings are provided facing each other, and the fluid pressure is adjusted so that the collision surface of both ejected fluids is formed within the bowl-shaped opening. The pressure regulating valves 261, 262 are connected to the pipes 271, 2.
A memory circuit is provided in the logic circuit section 30 provided in the middle of the pressure detection section 72 and further connected to the pressure detection sections 291 and 292. In the configuration described above, fluid is supplied to the opposing nozzles 281 and 282, fluid is also supplied to the hollow portion 22 of the object to be detected 21, and the object to be detected 21 is rotated at a low speed.

This causes the fluid ejected from the opposing nozzles 281, 282 and the fluid ejected from the holes 231, 232 to collide.

At this time, whether or not the pressure of the fluid in the tubes 271 and 272 has increased is stored in the memory circuit, and the logic circuit section 30 calculates the output of each memory circuit.
It is possible to detect whether or not 1,232 is penetrated. Furthermore, FIGS. 3A, b, and c show various shapes of opposing nozzles whose tips are opened in a bowl shape. For example, in detecting a state where the hole 3 and the opposing nozzle 8 are stopped as shown in FIG. Since the fluid is scattered due to the collision of the fluid, in order to prevent this, the collision surface of the fluid is made to take place within such a bowl-shaped opening. Alternatively, when the object to be detected rotates or not, in mass-production machining, it is difficult for the extended axis of the hole to accurately oppose the opposing nozzle due to variations in the processing accuracy of the object. In such cases, fluid collision may occur. The reliability of detection can be increased by making the surface pass through the bowl-shaped opening. Furthermore, when it is desired to increase the pressure change between when fluid collision is occurring and when no fluid collision is occurring, a throttle 12 having a smaller cross-sectional area than the opposing nozzle 8 is placed on the upstream side of the branch pipe 11 as shown in FIG. All you have to do is set it up.

As described above, the present invention makes it possible to increase the distance between the detection hole and the borrowed fluid ejecting means by utilizing the pressure increase caused by the collision of fluids ejected in opposite directions, and is extremely easy to install in processing equipment. It has an easy effect.

Detection can be incorporated as part of the machining process and can be detected without interrupting machining, improving production efficiency. Note that the detection unit has no mechanical moving parts or electrical contacts, so it is highly reliable, and can perform highly reliable detection without being affected by poor atmospheric conditions such as oil or dust. Furthermore, detection is possible even if the diameter of the hole in a single object to be detected or the distance between the hole and the opposing nozzle is different, or even if the hole is located at any position on the object or in any direction. be. As described above, since the present invention utilizes the hole in the object to be detected as one nozzle of the opposing sensor,
Penetration of the hole can be reliably detected simply by providing one opposing nozzle at the hole position, and its uses are very wide.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partial cross-sectional explanatory diagram illustrating a method for detecting hole penetration when an object to be detected is fixed. FIG. 2 is a partial cross-sectional explanatory diagram illustrating a method for detecting hole penetration when the holes are not lined up on the axis of the object to be detected. Figure 3A,
b and c are cross-sectional plan views showing various shapes of opposing nozzles having bowl-shaped tips; 1, 21... Object to be detected. 2,22...Hollow part. 3,231,232... hole. 8,281,282... Opposed nozzle. 9,291,292...Pressure increase detection section.

Claims (1)

[Claims] 1. In a device for detecting whether or not a hole in an object to be detected has penetrated through the hole, the device has a hole connected to a hollow part, and includes means for ejecting fluid from the hole, and a means for ejecting fluid from the hole, and A hole penetration detection device comprising receiving fluid ejecting means facing each other and means for detecting a pressure change of the receiving fluid.