JPH11101760A - Evaluation of edge welded part of wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for evaluating the edge welded part of a wheel enabling the total inspection of products in a non-destructive manner without requiring time in judgment. SOLUTION: At the time of the actual welding of a wheel 1, the rim outside surface temp. distribution of the edge welded part of the wheel 1 during welding is measured and the measured data is compared with the relation between the stored rim outside surface temp. distribution and the physical properties (welding shape, welding depth, strength or the like) of the welded part to estimate the physical properties of the welded part of the wheel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for evaluating the physical properties of a rim weld of a wheel.

[0002]

2. Description of the Related Art Conventionally, methods for evaluating the physical properties of an edge weld of a wheel include the following methods. Destructive inspection A sample is cut out from the wheel, the cross section is polished, then corroded with a corrosive liquid and observed and measured. Non-destructive inspection The ultrasonic probe is used to detect flaws from the outer surface of the wheel. Other Special Evaluation Methods In the case of fillet welding, for example, as disclosed in Japanese Patent Publication No. 7-95064, two leg lengths of fillet welding are measured, and the penetration depth is evaluated from the ratio.

[0003]

However, the conventional methods for evaluating the physical properties of the edge welding portion of a wheel have the following problems. Destructive inspection: Since the product itself cannot be destroyed, it is a method that repeats the test with a fixed amount of sample and guarantees the "penetration depth" assuming that the product is welded under the same welding conditions as the test Inspection of each product has not been performed. In addition, it takes time and cost to make the determination. Nondestructive inspection: Verification error is large and cannot be used practically. Also,
Usually not available for small wheels. In addition, the cost is high for 100% inspection. Evaluation by fillet welding leg length ratio: Applicable only to fillet welding, not to edge welding. Further, the penetration depth itself cannot be determined. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for evaluating a wheel edge welded portion of a wheel, which is non-destructive, does not require time for determination, and is capable of 100% inspection.

[0004]

The present invention to achieve the above object is as follows. The process of determining in advance the relationship between the rim outer surface temperature distribution during welding of a wheel edge welded part and the physical properties of the welded part and storing it in a computer, and welding the wheel edge welded part during actual welding of the wheel The inside rim outer surface temperature distribution is measured, and the measured data is compared with the relationship between the stored rim outer surface temperature distribution and the physical properties of the welded portion by a computer to determine the physical properties of the welded portion of the wheel. And a method for evaluating the edge welding portion of the wheel.

According to the method for evaluating the edge welding portion of a wheel according to the present invention, at the time of actual welding of the wheel, the welding current, welding voltage, welding speed, and rim outer surface temperature during welding are simply measured. The measurements and determinations are non-destructive and can be made in a short time, since the determinations are made in comparison with the stored data, so that a complete inspection of the product wheel is possible.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of an apparatus used for carrying out a method for evaluating a rim weld of a wheel according to an embodiment of the present invention. The apparatus shown in FIG. 1 includes a welding apparatus 10 for a wheel 1 (an automobile wheel formed by welding the entire circumference of a disk 2 and a rim 3 at an end of the disk) and a wheel disposed radially outside the apparatus. And an evaluation device 20 for edge welds. The evaluation device 20 for the edge welding portion of the wheel stores in advance the wheel outer surface temperature measuring device 30 disposed radially outside the rim 3 of the wheel 1 and the actually measured wheel outer surface temperature data. Compared to the data on the relationship between the wheel outer surface temperature and the physical properties of the edge weld, the physical properties of the wheel 1 during this welding (for example, “penetration depth”, “penetration shape”, “strength” (Including ancillary equipment such as a CRT) 40 for estimating and evaluating the information.

At the time of actual welding, the wheel 1 is mounted on a rotating welding jig 5 and rotated, and the entire periphery is welded by a stationary welding torch 6. Reference numeral 4 denotes a rim weld. The measurement of the wheel outer surface temperature by the wheel outer surface temperature measuring device 30 is performed simultaneously with the execution of welding.

The wheel outer surface temperature measuring device 30 includes an infrared radiation thermometer (sensor probe) 31, a horizontally movable stand 32 for vertically supporting the infrared radiation thermometer 31, and an infrared radiation thermometer 31. A vertical movement device 33 for moving the infrared radiation thermometer 31 in the vertical direction, a vertical movement controller 34 for controlling the vertical movement of the infrared radiation thermometer 31 by the vertical movement device 33, and an infrared radiation thermometer controller 35 for controlling the infrared radiation thermometer 31; Consists of

The front and rear positions of the entire stand are adjusted and fixed so that the outer surface of the wheel rim 3 is substantially located at the focal position of the infrared radiation thermometer 31 from the outside of the wheel 1. The vertical moving device 33 is fixed at the vertical position with respect to the stand 32 by the probe fixing tool 45 at a position where the infrared radiation thermometer 31 comes to a height corresponding to the height position of the edge welding portion 4 of the wheel. The infrared radiation thermometer 31 is a vertical moving device 3
3, the vertical movement is repeated at a predetermined period with a predetermined amplitude, and the vertical movement of the vertical moving device 33 is controlled by the vertical moving controller 34.

The computer 40 previously obtains and stores data on the relationship between the wheel outer surface temperature and the physical properties of the edge welds by a test. More specifically, the welding of the wheel usually proceeds by rotating the welding jig 5, but during this time, the wheel is not always manufactured in a completely perfect circle, The relative position with respect to the stationary welding torch 6 may slightly change. In such a case, as shown in FIGS. 2A and 2B, the “penetration shape” changes. When this is observed from the outside of the rim, the distribution of the high-temperature region 7 shown in the figure changes, and the position showing the highest temperature from the reference position (for example, the end of the disk) (“the maximum temperature height”, A in the figure) , B dimension) change.

If the rim plate thickness and the welding conditions are constant, there is a gap between the "maximum temperature height" and the "wire tip position" in FIG.
There is such a correlation. In other words, the maximum temperature height has a positive value, and the larger the value, the farther the wire aiming position is from the disk end surface, the penetration shape as shown in FIG. 2A, and the maximum temperature height has a negative value. The larger the absolute value of the value, the more the wire aiming position shifts toward the disk end face side, and a penetration shape as shown in FIG.

Therefore, the relationship between the maximum temperature height of the outer surface of the rim and the "penetration shape" is determined in advance (a destructive test or the like may be used when creating the data determined in advance), and this is stored in a computer. If it is stored, if the maximum temperature height is determined by measuring the distribution of the outer surface temperature of the rim at the time of actual welding, from the comparison between the maximum temperature height and the previously stored data, the `` penetration shape '', and The "penetration depth" on the disk side can be estimated. In this case, by measuring the maximum temperature in addition to the maximum temperature height, the "penetration depth" on the rim side can be estimated (the higher the maximum temperature of the rim outer surface, the closer the high-temperature area is to the position closer to the rim outer surface) And the "penetration depth" on the rim side is large.)

In gas shielded arc welding, under the same set welding conditions (conditions such as welding current and welding voltage), the readings of the welding current and welding voltage in FIGS. 2A and 2B hardly change. The relationship shown in FIG. 3 does not change so much even when the set welding conditions are changed, but has an effect when estimating the penetration depth (the penetration depth increases as the welding current and welding voltage increase). It is necessary to measure the welding current, welding voltage, and welding speed to correct the change in the penetration depth due to the deviation of the values from the set values. In this sense, the actual determination device monitors the welding current and welding voltage,
The measured and A / D converted signal is transferred to the CP of the computer 40.
U to correct the measurement data. Therefore, as shown in FIG. 5, the welding current and welding voltage measuring devices 8A and 8B and the A / D converter 9 for their signals are connected to the computer 40 as shown in FIG.

A program for executing the control routine of FIG. 4 is installed in the computer 40. In step 101, various parameters (rim thickness, disk thickness, set welding conditions, etc.) are input. Next, in step 102, it is confirmed whether or not the preparation for measurement of the rim outer surface temperature or the like (for example, whether the approximate focal position of the infrared radiation thermometer 31 is on the outer surface of the wheel rim 3) is completed. Next, at step 103, the welding start signal is turned on.

In step 104, the welding machine is operated. There, the shielding gas is supplied, the wire supply speed, the welding power supply is turned on, and the wheel is rotated. At the same time, the infrared radiation thermometer controller 35 and the infrared radiation thermometer 31 are operated, and the vertical movement device 33 and the vertical movement controller 34 are activated. In step 105, the highest temperature height (the height of the highest temperature position from the reference position) is measured by the infrared radiation thermometer 31 that moves in the vertical direction, and the highest temperature is measured. At this time, measured values are plotted and displayed on the computer screen (CRT) with the horizontal axis representing the welding start position to the welding end position and the vertical axis representing the maximum temperature height and the maximum attained temperature, and the reference value is also displayed. The deviation from the reference value can be confirmed.

In step 106, an average welding current, an average welding voltage, and an average welding speed in a cycle from the start to the end of welding of one wheel are measured and calculated. At this time, on the computer screen, measured values are plotted and displayed on the horizontal axis with the welding start position to the welding end position and the vertical axis with current I, voltage V, and speed v, and respective reference values are also displayed. The deviation from the value can be confirmed.
In step 107, the measured current I, voltage V, and speed v
A correction value from the reference penetration depth is calculated based on the deviation from the reference value.

Then, in step 108, step 1
In addition to estimating the penetration shape of the weld 4 based on the relationship between the maximum temperature height and the maximum temperature measured at 05 and the maximum temperature height of the rim outer surface stored in advance and the (penetration shape), Based on the correction value from the reference penetration depth obtained in 107, the penetration shape of the welded portion 4 is corrected, the corrected penetration shape is estimated and plotted, and displayed on a computer screen (CRT). Next, in step 109, based on the penetration shape estimated in step 108, the penetration depth, welding length, and welding strength of the edge weld portion 4 are calculated and obtained, and within the respective allowable values (the upper limit value and the upper limit value). Is in the range between the lower limit) and output it to the computer screen,
indicate.

Next, a description will be given of a method of evaluating a rim welding portion of a wheel according to an embodiment of the present invention, which is performed using the above-described apparatus. The evaluation method of the edge welding portion of the wheel according to the embodiment of the present invention is as follows. The relationship between the rim outer surface temperature distribution during the welding of the edge welding portion 4 of the wheel 1 and the physical properties of the welding portion 4 is obtained in advance and stored in the computer 40. And the step of measuring the outer surface temperature distribution of the rim during welding of the edge welding portion 4 of the wheel 1 during the actual welding of the wheel 1 and storing the measured data in the above-described stored rim outer surface temperature distribution and the welding portion. Estimating the physical property of the welded portion 40 of the wheel 1 by comparing the relationship with the physical property of the wheel 1 by the computer 40.

The physical properties of the welded portion 4 include at least one of penetration depth, penetration shape, strength and the like. For measuring the rim outer surface temperature, for example, an infrared radiation thermometer 31 that moves in the vertical direction is used. In this case, the temperature of the outer surface of the rim is measured, and the measurement is performed easily and in a short time without contact from the outside of the rim. The computer 40 compares the data stored in advance with the measurement data at the time of actual welding. In addition, in estimating the penetration shape, the maximum temperature height position changes depending on the wire aiming position shown in FIGS. 2A and 2B, and the maximum arrival temperature changes depending on the penetration depth on the rim side. It is estimated based on that. The calculation, comparison, and estimation by a computer can be easily performed in a short time, at a low cost, and can completely inspect all product wheels.

[0020]

According to the method for evaluating the edge welding portion of a wheel according to the present invention, at the time of actual welding of the wheel, only the welding current, welding voltage, welding speed and the rim outer surface temperature during welding are measured. The measurements and determinations are non-destructive and can be made in a short time, since the computer makes the determinations by comparing them with pre-stored data, so that a complete inspection of the product wheels is possible.

[Brief description of the drawings]

FIG. 1 is a front view and a sectional view of an apparatus used for carrying out a method for evaluating a rim welded portion of a wheel according to an embodiment of the present invention.

FIG. 2 is a partial front view of a wheel and a welding torch showing a relationship between a relative position of the welding torch and the wheel and a penetration shape;

FIG. 3 is a graph showing an example of a relationship between a maximum temperature height and a wire target position.

FIG. 4 is a process chart showing processing contents of a computer in a control routine.

5 is a system diagram of an apparatus in which a system for inputting measurement signals of welding current and welding voltage to a computer is added to the apparatus of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wheel 2 Disk 3 Rim 4 Edge welding part 10 Welding apparatus 20 Edge welding part evaluation apparatus 20 30 Wheel outer surface temperature measuring apparatus 30 31 Infrared radiation thermometer (sensor probe) 31 32 Stand 33 Vertical movement machine 34 Vertical movement controller 34 35 Infrared radiation thermometer controller 35

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // B60B 3/04 B60B 3/04 E

Claims (1)

[Claims] A step of obtaining in advance a relationship between a rim outer surface temperature distribution during welding of a rim weld portion of a wheel and a physical property of the weld portion and storing the relationship in a computer; The outer surface temperature distribution of the rim during welding of the edge weld is measured, and the measured data is compared with the relationship between the stored outer surface temperature distribution of the rim and the physical properties of the welded portion by a computer. Estimating the physical properties of the part, and a method for evaluating a wheel edge welded part comprising: