JPH10249941A - Apparatus and method for determining non-defective or defective of welding of welded material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly determine non-defective or defective of welding by shortening a time required for the determination. SOLUTION: This apparatus comprises temperature sensors 14, 15a to 15c disposed at upstream and downstream of an ultrasonic welder 21 at a conveying route 12a to detect temperatures of the vicinity of a part to be welded before and after welding, and a determination control means 20 for obtaining a temperature difference of the vicinity of a part to be welded before and after welding based on measured temperatures from the sensors 14, 15a to 15c to determine non-defective or defective of the welding at the welded material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an object to be welded which is suitable for use in judging good or bad of a welding state in a sealing portion of a stopper frame mounted on an opening container of an infusion medicine bottle, for example. And a method for determining the quality of welding.

[0002]

2. Description of the Related Art In recent years, the development of welding methods has been remarkable, and electron beam welding, CO ₂ arc welding, ultrasonic welding and the like have been developed one after another, and each of them has been put to practical use. Among these welding methods, ultrasonic welding is widely used in various fields because of its advantages such as mass production, small deformation of joints, and extremely short work time. I have.

[0003] By using such an ultrasonic welding method, for example, in the medical industry, welding of plastic plug body elements constituting a plug body such as a drip bottle is performed.

[0004] Usually, the stopper of this kind of infusion drug bottle is shown in FIG.
It is configured as shown in FIG. This plug will be described with reference to FIG. 1. In FIG. 1, a plug denoted by reference numeral 1 includes an inner plug 2, a rubber plug holder 3, a rubber plug 4, a cover cap 5, and a sealing member 6, and is drip-injected. It is attached to the medicine bottle 7.

[0005] The inner stopper 2 is attached to the opening end face 7a of the infusion vial 7, and is formed of a plastic annular body having a thin film 8 in the center. The rubber stopper 3 is ultrasonically welded to the inner end 2a of the inner stopper 2 on the side opposite to the vial, and is entirely formed of a plastic annular body having two inner and outer flanges 9,10. The rubber stopper 4 is housed in the inner stopper 2 and is interposed between the rubber stopper 3 and the thin film 8.

The cover cap 5 is disposed on the side opposite to the thin film of the rubber stopper 4 via a sealing member 6 and has a rubber stopper 3.
Is welded by high frequency to an annular projection 9a located between the inner flange 9 and the outer flange 10. Seal member 6
Is interposed between the cover cap 5 and the rubber stopper 3, and is entirely formed of a circular plate containing metal (aluminum).

In the thus constructed stopper, the cover cap 5 and the sealing member 6 are removed from the rubber stopper 3 at the time of instillation, and then the drip liquid taking-out tube (not shown) is attached to the rubber stopper 4 and the thin film 8. ) Is inserted into the drip bottle 7 so that the drip solution in the drip bottle 7 is taken out of the drip bottle 7. And the rubber stopper 3 must be sufficiently sealed.

For this reason, in the production line of the plug, great care is paid particularly to the inspection of the welded state of the sealed portion between the inner plug 2 and the rubber plug retainer 3.

Conventionally, this type of inspection is performed by applying a tensile force to the inner plug 2 and the rubber stopper 3 in a direction in which the inner plug 2 and the rubber plug retainer 3 are separated from each other, thereby judging the quality of the welded state at the sealed portion. Has been adopted.

[0010]

However, in the conventional method for judging the quality of welding of a welded object, since it is performed by manual sampling inspection, it takes a lot of time to judge the quality of welding, and There is a problem that the judgment cannot be made quickly.

The present invention has been made in view of such circumstances, and focuses on the fact that the temperatures near the welded portion before and after welding are different from each other, and based on these temperature information, a series of calculations, comparisons, determinations, and the like. By skillfully utilizing the control technology for performing the processing, the welding quality determination device for the welded material can automatically determine the quality of the welded material to be welded, and thus can quickly determine the quality of the welded material. The purpose is to provide a method.

[0012]

In order to achieve the above-mentioned object, an apparatus for judging the quality of welding of a material to be welded according to claim 1 of the present invention is provided on an upstream side and a downstream side of a welding machine in a transport path, respectively. Two sets of temperature sensors for detecting the temperature near the welded part before and after, respectively, and the temperature difference near the welded part before and after welding connected to these two sets of temperature sensors is determined, and this temperature difference and the specified value are calculated. It is configured to include a judgment control means for comparing and judging the quality of welding.

According to a second aspect of the present invention, in the apparatus for judging the quality of the welding of the object to be welded according to the first aspect, the downstream temperature sensor of the two upstream and downstream temperature sensors comprises a plurality of temperature sensors. is there.

According to a third aspect of the present invention, there is provided the first or second aspect.
In the apparatus for judging the quality of welding of the object to be welded, the temperature sensor is constituted by a radiation thermometer.

According to a fourth aspect of the present invention, in the apparatus for determining the quality of welding of the object to be welded according to the first, second, or third aspect, the transport path is provided on the periphery of the rotary table.

According to a fifth aspect of the present invention, there is provided a method for judging whether or not a welded object is welded, by detecting a temperature near a welded portion before and after welding from the outside of the object to be welded by a temperature sensor, and then calculating a temperature difference from the two temperatures before and after the welding. After calculating and comparing the temperature difference with a predetermined value set in advance, it is a method of judging the quality of welding of the article to be welded based on the comparison result.

According to a sixth aspect of the present invention, in the method for judging whether or not the object to be welded is good or bad according to the fifth aspect, the temperature after welding by the temperature sensor is detected at a plurality of locations near the welded portion.

The invention according to claim 7 is the invention according to claim 5 or 6.
In the method for judging the quality of welding of the article to be welded, when the temperature difference in the vicinity of the welded portion before and after welding is less than 6 ° C., it is determined that the welding is defective.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. 1 and 2 are a plan view and a block diagram showing an apparatus for judging the quality of welding of an object to be welded according to a first embodiment of the present invention, and FIG. 3 is a view for judging the quality of welding of an object to be welded according to the first embodiment of the present invention. It is a flowchart shown for demonstrating a method. In FIGS. 1 and 2, an object to be welded is used as an assembly before welding and an assembly after welding of the inner stopper 2 and the rubber stopper 3 described in FIG. First, an apparatus for determining the quality of welding of an object to be welded according to the present embodiment will be described with reference to FIGS.

In FIG. 1 and FIG. 2, a welding quality determination device indicated by reference numeral 11 is composed of a rotary table 12 and a position sensor 1.
3 and two sets of temperature sensors 14 and 15 and A / D converters 16 to
19 and a determination control means 20, which are connected to an ultrasonic welding machine 21. The rotary table 12 is formed of a disk table having a rotary shaft (not shown) at a center position thereof, and is configured to be able to rotate at a predetermined rotation speed in a direction indicated by an arrow m. On the peripheral edge of the turntable 12, a transport path 12a for transporting the article 100 to be welded from the carry-in position A on the upstream side to the carry-out position B on the downstream side is provided.

The position sensor 13 is, for example, a light reflection type sensor, is disposed downstream of the carry-in position A, and is connected to the judgment control means 20 (control unit). This allows
The position of the article to be welded 100 can be detected at a predetermined position on the transport path 12a.

The temperature sensors 14 and 15 determine that the temperature of the object is 0.
It is constituted by, for example, a radiation thermometer capable of detecting a temperature in the range of 100C to 100C. The temperature sensor 14 comprises a single temperature sensor, is disposed between the position sensor 13 and the ultrasonic welding machine 21, and is transmitted to the determination control means 20 (storage unit) via the A / D converter 16. Connected. Thus, the temperature in the vicinity of the welded portion (the top surface of the welded portion 100) before welding is detected from the outside of the welded object 100 at a single location.

On the other hand, the temperature sensor 15 comprises three temperature sensors 15a to 15c, each of which is
0 (arithmetic unit) via A / D converters 17 to 19. Thereby, the temperature near the welded portion after welding from the outside of the welded object 100 (the top surface of the welded object 100) can be detected at three places.

Each of the A / D converters 16 to 19 detects the temperature (0 ° C. to 100 ° C.) detected by each of the temperature sensors 14 and 15.
The analog amount of DC4mA to 20mA corresponding to A / D
After conversion, these signals are output to a storage unit and a calculation unit (both of which will be described later) of the determination control unit 20 according to a timing signal from a control unit (to be described later) of the determination control unit 20.

The judgment control means 20 includes a control unit 22, a storage unit 23, a calculation unit 24, a comparison unit 25, a setting unit 26, and a judgment unit 2.
7 are provided. The control unit 22 receives the output signal from the position sensor 13 and outputs a timing signal, and outputs each of the units (the storage unit 23, the operation unit 24, and the comparison unit 2) in the determination control unit 20.
5, the determination unit 27) and the ultrasonic welding machine 21 are driven and controlled.

The storage unit 19 stores the temperature near the welded portion before welding detected by the temperature sensor 14 as welding quality determination information. The calculation unit 24 includes the temperature sensor 15
Then, the temperature in the vicinity of the welded portion after welding detected as described above is taken as welding quality determination information, and the temperature difference near the welded material before and after welding is calculated from these information and the information in the storage unit 19. The comparing unit 25 compares the temperature difference (0 ° C. to 100 ° C.) calculated by the calculating unit 24 with the specified value set by the setting unit 26.

The setting section 26 sets a specified value in advance in a temperature range of, for example, 6 ° C. (lower limit temperature value) to 50 ° C. (upper limit temperature value). When the temperature rise is lower than 6 ° C., the sealing property of the article 100 to be welded is reduced. Therefore, the integral strength required for the sealed portion of the article 100 to be welded is taken into consideration. Is set. Here, FIG. 4 shows the relationship between the temperature rise (° C.) in the vicinity of the portion to be welded by welding and the integrated strength (kg) of the material to be welded 100.
From this, it is understood that when the rising temperature is 6 ° C. or more, the integrated strength becomes saturated at about 17 kg. The value of the integrated strength in this saturated state differs depending on the material and thickness of the material to be welded (rubber stopper 3) and the portion to be welded (flange 10), and is not limited to the above value of 17 kg. . On the other hand, when the temperature rise exceeds 50 ° C., the temperature in the vicinity of the welded portion becomes abnormally high.

The judging section 27 judges the quality of the welding of the article 100 to be welded based on the comparison result in the comparing section 25. That is, when the temperature difference before and after welding is less than 6 ° C. and is 50 ° C. or more, it is determined that “welding is defective” and the temperature difference is 6 ° C.
When the temperature is not less than 50 ° C. and less than 50 ° C., that is, when the integrated strength of the article to be welded 100 is approximately 17 kg, “good welding” is determined.

As described above, when the drip solution in the drip vial 7 is taken out, the cover cap 5 and the seal member 6 are removed from the rubber stopper 3.
The high frequency welding portion between the rubber stopper 3 and the cover cap 5 has a smaller welding area and lower welding strength than the ultrasonic welding portion between the inner stopper 2 and the rubber stopper 3. Therefore, when an external force is applied in such a direction that the inner stopper 2 and the rubber stopper 3 are separated from each other, the high-frequency welding portion between the rubber stopper 3 and the cover cap 5 is peeled off. Peel off.

Next, a method for judging the quality of welding of the object to be welded in this embodiment will be described with reference to FIG. [Setting of Specified Value (Step S1)] The setting of the specified value “6 ° C. (lower limit temperature value) to 50 ° C. (upper limit temperature value)” is performed by the setting unit 26 in the judgment control means 20.

[Detection of Presence or Absence of Welding Object (Step S2)]
The presence or absence of the object 100 is detected by a signal from the position sensor 13. That is, when the position sensor 13 detects that the turntable 12 is rotated in the direction indicated by the arrow m and the object to be welded (work) 100 is transferred to a predetermined position, the control unit 22 outputs an output signal from the position sensor 13. And outputs a timing signal based on the timing.

[Temperature Measurement Before Welding (Step S3)] The temperature measurement before welding is performed by using the temperature sensor 14 and the A / D converter 16.
Done by That is, when the temperature sensor 14 detects the temperature near the welded portion before welding at a single point after the position sensor 13 detects the welded object 100 at a single point, the DC 4 mA corresponding to the detected temperature (0 ° C. to 100 ° C.)
The A / D converter 16 converts the analog amount of 20 mA into a digital amount and outputs the digital amount to the storage unit 19. This output signal is stored in the storage unit 19 as welding quality determination information.

[Welding (Step S4)] Welding is performed by using an ultrasonic welding machine 21 after measuring the temperature before welding.
Perform for In this case, the horn (not shown) of the ultrasonic welding machine 21 is rotated along the welded portion, or the pedestal (not shown) on the rotary table 12 is rotated to rotate the horn (not shown). Are welded circumferentially.

[Measurement of Temperature after Welding (Step S5)] The temperature measurement after welding is performed by using the temperature sensors 15a to 15c and the A / D.
This is done by the converters 17-19. That is, when the temperature sensors 15a to 15c detect the temperature near the welded portion after welding at three places, the detected temperatures (0 ° C.
Each of the A / D converters 17 to 19 converts an analog amount of DC 4 mA to 20 mA corresponding to 100 ° C.) into a digital amount, and outputs the digital amount to the arithmetic unit 24 as welding quality determination information.

[Judgment of Welding Quality of Welding Object (Step S
6)] The quality of the welding of the article 100 to be welded is determined by calculating the temperature difference in the vicinity of the welded area before and after welding by the arithmetic unit 24 as many times as the number of measured post-welding temperatures.
After comparing the specified value set in step 1 with the comparison unit 25,
The determination is performed by the determination unit 27 based on the comparison result. That is, in the determination unit 27, even if each temperature difference before and after welding is 6
When the temperature is lower than 0 ° C, it is determined as “poor welding”, and when all the temperature differences are within the temperature range of 6 ° C to 50 ° C, it is determined as “good welding”.

It should be noted that when the determination of "poor welding" was made continuously N (integer) times, or when the temperature difference after welding exceeded 50 ° C., there was an abnormality in the ultrasonic welding machine 21. The ultrasonic welding machine 21
It is also possible to output an abnormal temperature rise signal to stop the ultrasonic welding machine 21.

In step S6, "good welding"
Is determined, the object 100 is conveyed to the next step (step S7), and the presence or absence of the next object 100 at a predetermined position on the turntable 12 is detected by the position sensor 13 (step S8). In step S8, when the object to be welded 100 is detected, the process returns to step S3, and when not detected, the process ends.

On the other hand, in step S6, "poor welding"
Is determined, the object 100 to be welded is removed from the transport path 12a by a rejector (not shown) (Step S).
9). In this case, the determination of “poor welding” is made by the ultrasonic welding machine 2
Since it is considered that the welding is performed due to a failure such as No. 1 or the like, when the determination of “poor welding” is performed N times consecutively, the driving of the rotary table 12 and the like is stopped and the ultrasonic welding machine 21 and the like are stopped. May be checked. Thereafter, the presence or absence of the next article to be welded 100 on the turntable 12 is detected by the position sensor 13 (step S8).

In the present embodiment, the case where the temperature sensors 14 and 15 are radiation thermometers has been described, but the present invention is not limited to this, and other non-contact type temperature sensors or contact type temperature sensors may be used. You can do nothing at all.

In this embodiment, the transport path 1
2a is provided on the periphery of the turntable 12, that is, along the rotation direction of the turntable 12,
The present invention can also be provided along a linear movement direction of the conveyor using a conveyor (not shown).

Further, in the present embodiment, the case where the temperature after welding is detected at three points has been described, but the present invention is not limited to this, and it is needless to say that two or four or more points may be detected. is there. Also, the lower limit temperature value and the upper limit temperature can be changed depending on the material of the material to be welded, the welding temperature, the conditions for temperature measurement, and the like.

[0042]

As described above, according to the present invention, two sets of temperature sensors are provided respectively on the upstream and downstream sides of the welding machine in the transport path and detect the temperatures near the welded parts before and after welding, respectively. A determination control means is connected to these two sets of temperature sensors to determine the temperature difference in the vicinity of the welded part before and after welding, and compares this temperature difference with a specified value to determine whether welding is good or not. Is automatically determined.

Therefore, it is possible to shorten the time required for judging the quality of welding and to quickly perform the judgment, and to judge the quality correctly.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing an apparatus for determining the quality of welding of an object to be welded according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an apparatus for judging whether welding is good or not according to an embodiment of the present invention.

FIG. 3 is a flowchart illustrating a method for determining whether welding is good or bad according to an embodiment of the present invention.

FIG. 4 is a view showing a relationship between a temperature difference of a welded portion before and after welding and an integrated strength.

FIG. 5 is a local sectional view showing a medicine bottle for infusion and a stopper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Rotary table 12a Transport path 14, 15 (15a-15c) Temperature sensor 20 Judgment control means 21 Ultrasonic welding machine 100 Welding object

Claims (7)

[Claims] 1. Two sets of temperature sensors disposed on the upstream and downstream sides of a welding machine in a transport path, respectively, for detecting temperatures near a welded part before and after welding, and connected to these two sets of temperature sensors, Determining the temperature difference in the vicinity of the welded portion before and after welding, and comparing the temperature difference with a specified value to determine whether or not the welded portion is welded; Welding quality judgment device. 2. The apparatus according to claim 1, wherein a downstream temperature sensor among the temperature sensors comprises a plurality of temperature sensors. 3. The apparatus according to claim 1, wherein said temperature sensor comprises a radiation thermometer. 4. The method according to claim 1, wherein the conveying path is provided on a peripheral edge of the rotary table.
The apparatus for judging the quality of welding of an object to be welded according to the above. 5. A temperature sensor detects the temperature near the welded portion before and after welding from outside of the welded object, and then calculates a temperature difference from both the temperatures before and after welding, and determines the temperature difference and a preset temperature difference. A method for determining the quality of welding of the object to be welded, comprising: comparing the value with a specified value; and determining whether the object to be welded is good or bad based on the comparison result. 6. The method according to claim 5, wherein temperature detection after the welding by the temperature sensor is performed at a plurality of locations near the welded portion. 7. The method according to claim 5, wherein when the temperature difference in the vicinity of the portion to be welded before and after welding is less than 6 ° C., it is determined that the welding is defective.