JPS63206630A - Weld defect detector - Google Patents

Abstract

PURPOSE:To improve a test efficiency, realize an on-line application and save labor by providing an intake air seal member having a gas intake chamber inside and arranged opposite to a pressing seal member so as to sandwich the weld of the wheel of an automobile between the intake air seal member and the pressing seal member. CONSTITUTION:A weld defect detector is composed of a frame 10 for holding a wheel 1 on a receiving surface, a pressing seal member 11 provided outside and inside the weld of the wheel 1 below the frame 10 and having a gas pressurizing chamber 11a inside, a supply unit 21 for supplying the pressurizing chamber 11a with a testing gas, an intake air seal member 12 provided opposite to the seal member 11 so as to sandwich the weld between the members 11 and 12 below the receiving surface and having a gas intake chamber 12a inside, a leak detector 26 provided for detecting the leakage of the testing gas from the weld and connected to the gas intake chamber 12a and the like. When the seal members 11 and 12 are raised to the position of the weld and brought into contact with the weld under pressure, the testing gas leaks to the seal member 12 side to be detected by the detector 26 and the defect of the weld can be detected, when the defect is present in the weld.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding defect detection device that can automatically detect welding defects in welded parts of automobile wheels.

In general, automobile wheels are manufactured by welding the butt ends of circularly curved plates, and in the subsequent process, we check the quality of the weld, that is, whether there are weld defects. It is necessary to inspect whether

Conventionally, this type of inspection has been carried out by pressing a pressurized sealing material supplied with, for example, a cloudy test liquid into the internal space against the weld, and visually observing whether the test liquid leaks from the weld. was.

However, the visual inspection as described above has the disadvantage of poor inspection efficiency and is particularly unsuitable for online inspection.

Naturally, there is also the drawback that labor savings cannot be achieved.

The present invention has been made to solve the problems of the prior art, and can automatically detect welding defects, thereby improving inspection efficiency, on-line application, and further saving labor. The purpose of the present invention is to provide a welding defect detection device that can be used to detect welding defects.

A step for fortune-telling.

The welding defect detection device according to the present invention includes: a pedestal for holding an automobile wheel on a receiving surface with the axis of the automobile wheel in a vertical direction; A pressurizing sealing material provided on the outside or inside of the welding part and having a gas pressurizing chamber therein, a gas supply unit supplying inspection gas to the gas pressurizing chamber, and a lower part of the receiving surface. , disposed opposite to the pressure sealing material so as to sandwich the welded portion of the automobile wheel;
an intake sealing material having a gas intake chamber therein; a leak detector connected to the gas intake chamber to detect leakage of the inspection gas from the welded portion; and the pressurizing sealing material and the intake sealing material. and means for pressing the pressure sealing material and the intake sealing material against the inner and outer surfaces of the welded portion.

When a fin is scolded, raise the pressurized seal material and intake seal material to the position of the weld and press them against it. If there is a defect in the weld, the inspection gas will leak to the intake seal material. Since this will be detected by the leak detector, welding defects can be detected.

Soaran dish Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic plan view, not showing the welding defect detection device according to the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. FIG. 3 is a sectional view of a main part showing a state in which it is pressed against a welding part.

At a predetermined position on the conveyance path of the automobile wheel 1, which is conveyed with the axial direction being vertical, there is a roller conveyor 2. 2 are arranged side by side with appropriate spacing in the front and back direction. The roller conveyor 2.2 has a large number of free rollers 3.
. . . is adapted to receive and transport both ends of the automobile wheel 1 in the front and rear direction.

Here, the automobile wheel 1 has a welded portion W as shown in the figure.
is conveyed downstream and located in the center between roller conveyors 2.2, and this welded part W
The alignment with respect to the roller conveyor 2.2 is performed in advance by alignment means (not shown) provided on the upstream side.

A support plate 4 is placed at an appropriate height between the roller conveyors 2 and 2.
It is a passing. An air cylinder 5 for raising and lowering the detection frame 10 is attached to the lower surface of the support plate 4 at the center position in the front-rear direction on the right side. That is, an air cylinder 5 through which a support plate 4 is inserted is provided on the lower surface of the detection pedestal 10 which has a rectangular shape long in the left and right directions.
The upper ends of the rods 6 are connected to each other, and the detection frame 10 moves up and down in accordance with the advance and ingress of the rod 6.

This lifting and lowering is carried out by guide points 7 provided on the left and right sides of the air cylinder 5.
．． A guide shaft 8.8 fitted to 7 so as to be slidable in the vertical direction
This allows for smooth guidance.

The detection frame 10 is provided with a pressure sealing material 11 and an air intake sealing material 12 so as to be movable toward and away from each other in the left and right directions. That is, wall members 13.13 are provided at both left and right ends of the detection mount 10, and an air cylinder 14 is provided on the left wall member 13 for advancing and retracting a support block 17 fixed to the intake sealing material 12 in the left and right direction. An air cylinder 15 is attached to the right wall member 13 for advancing and retracting a support block 18 fixed to the pressure sealing material 11 in the same manner. Therefore, the rod 14 of the air cylinder 14.15
a, pressurized sealing material 1 according to the amount of advancement and retraction of 15a.
1. The intake sealing material 12 moves toward and away from the air. 16
. . are guide plates attached to both the front and rear ends of the detection stand 10, which allow the pressure sealing material 11 and the air intake sealing material 12 to move without backlash in the front and rear direction.

The pressure sealing material 11 and the intake sealing material 12 have a gas pressurizing chamber 11a and a gas intake chamber 12a facing each other, and are formed into a U-shaped cross section, and are made of, for example, hard rubber or the like. Become. As shown in FIG. 3, when the pressurized sealing material 11 is pressed against the outer peripheral surface of the automobile wheel 1, the upper and lower ends of the sealing material 11 are placed on the automobile wheel 1, respectively.
The lower edges 1a and Ib are in close contact with the outer surfaces of the lower edges 1a and Ib, and the gas pressurization chamber 11a is shielded from the outside. on the other hand,
When the intake sealing material 12 is pressed against the inner circumferential surface of the automobile wheel I, its upper and lower ends come into close contact with the inner surfaces of the upper and lower edges 1a and lb of the automobile wheel 1, respectively.
The gas intake chamber 12a will be shielded from the outside.

The gas pressurization chamber 11a has a right wall portion 11b of the pressurization sealing material 11.
Hose 2 with one end connected to the gas introduction hole 11c opened in
A test gas such as freon gas or helium gas is supplied from the test gas supply unit 21 via the gas supply unit 21. A valve 22 is provided in the middle of the hose 20 for selectively supplying and stopping gas for testing to the gas pressurizing chamber 11a. This switching of the valve 22 is performed by a pulp opening/closing controller (not shown).

The hose 20 is made of a highly flexible material.

On the other hand, one end of a hose 23 similar to that described above is connected to a gas suction hole 12c opened in the left wall portion 12b of the intake sealing material 12. The other end of the hose 23 is connected to an exhaust fan 24. If there is a welding defect in the weld W, the fan 24 passes through the weld W from the gas pressure chamber 11a to the gas intake chamber 12a.
In order to exhaust the test gas that flows out. This evacuation is performed at the end of the inspection, as will be described later. Furthermore, a hose 25 branching off from the hose 23 is provided in the middle. A leak detector 26 is connected to the tip of the hose 25 for detecting gas for inspection and detecting whether a welding defect exists in the weld W based on the detection result.

Next, a case will be described in which a welded portion W is inspected using the apparatus of the present invention. Pressure sealing material II and intake sealing material 1
When the automobile wheel is transported above the installation position 2, a wheel detector (not shown) such as a photoelectric switch installed on the side of the transport area detects this, and the detection result is sent to the air cylinder 5. 14 and 15 respectively to drive control circuits (not shown). Then, the air cylinder 5 is first driven to raise the detection stand 10, that is, the pressure sealing material 11 and the intake sealing material 12 connected thereto, to the pressure contact position.

Next, the air cylinders 14 and 15 are driven, and the intake seal material 12 and the pressurized seal material 11 are attached to the automobile wheel 1.
The state shown in FIG. 3 is that the inner part including the welded part W is pressed against the outer circumferential surface.

Next, a detector (not shown) such as a limit switch detects this press-contact state and reports the detection result to the valve opening/closing controller. Then, the valve 22 opens,
Test gas is supplied from the test gas supply unit 21 to the gas pressurization chamber 11a of the pressurized sealing material 11.

If a welding defect exists in the weld W in this state, the inspection gas flows out from the gas pressurization chamber 11a into the gas intake chamber 12a of the intake sealing material 12, and further flows through the hose 23.25. The leak detector 26 is then fed to the leak detector 26. In this way, the leak detector 26, which detects leakage of the inspection gas, detects weld defects in the weld W.

When the inspection is completed, the valve 22 is closed, the fan 24 is activated, and the gas intake chamber 12a1 hose 23 is closed.
．． The residual gas remaining in the chamber 25 is discharged to the outside in preparation for the next inspection.

In addition, the drive of the air cylinder 5.14.15 described above,
The opening/closing of the valve 22 and the driving of the fan 24 are controlled by a process control computer (not shown), so that there is no time lag in these operating amounts.

Although the illustrated embodiments are as described above, the present invention is not limited to the above embodiments, and various modifications are possible.

That is, instead of the roller conveyor described above, the automobile wheel 1 may be conveyed by a roller conveyor or belt conveyor that itself drives, or the automobile wheel 1 may be mounted on a fixedly arranged pedestal. Of course, it is also possible to adopt an embodiment where the

Furthermore, the pressure sealing material 11 may be provided on the inner surface of the automobile wheel 1, and the air intake sealing material 12 may be provided on the outer surface.

1 In the case of the above-described device of the present invention, welding defects in welded parts of automobile wheels can be automatically detected.
It becomes possible to apply it online, and inspection efficiency can be significantly improved compared to the case using the above-mentioned conventional technology.

Naturally, this also has the effect of saving labor.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, FIG. 1 is a schematic plan view showing a welding defect detection device according to the present invention, and FIG. 2 is a line AA in FIG. 1. FIG. 3 is a cross-sectional view of a main part showing a state in which a pressure sealing material and an intake sealing material are pressed into a welded portion. 1... Automobile wheel 2... Roller conveyor 5... Air cylinder 10... Detection frame 11... Pressure sealing material 11a... Gas pressurizing chamber 12... Intake sealing material 12a. ...Gas intake chamber 14...Air cylinder 15...Air cylinder 21...Test gas supply unit 26...Leak detector

Claims (1)

[Claims] (1) A device for detecting weld defects in welds existing on the circumferential surface of an automobile wheel, which holds the automobile wheel on a receiving surface with its axis aligned in the vertical direction. a pedestal; a pressurizing sealing material provided below the receiving surface on the outside or inside of the welded portion of the automobile wheel and having a gas pressurizing chamber therein; and a pressurizing sealing material having a gas pressurizing chamber inside; a gas supply unit for supplying gas; and a gas supply unit disposed below the receiving surface to face the pressurized sealing material so as to sandwich the welded portion of the automobile wheel;
an intake sealing material having a gas intake chamber therein; a leak detector connected to the gas intake chamber to detect leakage of the inspection gas from the welded portion; and the pressurizing sealing material and the intake sealing material. A welding defect detection device comprising means for raising and lowering the pressure sealing material and the intake sealing material against the inner and outer surfaces of the welded portion.