JP6933319B1 - High frequency welding method and high frequency welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency welding method and a high frequency welding apparatus capable of welding under appropriate welding conditions even when the size and shape of the object to be welded are changed at the time of actual welding work. Prior to welding work, high-frequency energy is applied to a model welded object in advance, and riser information such as a rise time and a rise current value is reached until a predetermined current value at which the model welded object is not welded is reached. The rise information range is determined based on the measured rise information, and the correspondence between the rise information range and the welding conditions according to the model welded object is stored, and high frequency is applied to the welded object during welding work. By the time energy is applied and a predetermined current value is reached, rise-up information is acquired, the acquired rise-up information is compared with the stored rise-up information range, and welding conditions are selected according to the object to be welded for welding. do. [Selection diagram] Fig. 4

Description

The present invention relates to a high-frequency welding method and a high-frequency welding device used for heat-welding a synthetic resin or the like, and more particularly to a high-frequency current control method and a high-frequency welding device using the same.

Conventionally, heat welding of an object to be welded made of a synthetic resin material has been widely performed, and one of the methods is a high frequency welding method. In the high-frequency welding method, when a strong high-frequency electric field is applied to a plastic material, film, sheet, etc., the polarity of the electrode changes continuously at the molecular level, and collision, vibration, and friction at the molecular level occur inside the substance. , Self-heating, plastic materials, films, sheets, etc. are fused and welded.

As a method for controlling high-frequency current, a method of setting the supply time of high-frequency current supplied to the welded object (hereinafter referred to as "welding time") to a predetermined value is common, but the size and shape of the welded object. If it is controlled by a uniform welding time for different welded objects, it may result in excessive welding, which is excessive welding, sparks, or insufficient welding.

FIG. 19 shows the relationship between the welding time (S) and the current (A) when high-frequency welding is controlled only by the conventional welding time to weld plastic materials having different optimum welding times. rice field. In FIG. 19, the welding time (S) is taken on the X-axis and the current (A) is taken on the Y-axis.

In FIG. 19, a uniform welding time, that is, T2 at the end of welding is used for welding of three types of plastic materials (material A, material B, and material C) having different optimum welding times. It was illustrated that (1) the material A has an excessive amount of welded material and (2) the material C has an insufficient welded material when the material is welded. In FIG. 19, the material B illustrates normal welding.

In FIG. 19, a high-frequency current is uniformly applied until the end of welding (T2), but the material A (graph of the alternate long and short dash line in FIG. 19) is welded from the start of welding (T0) to before the end of welding (T2). Welding of the welded object has already been completed at time (T1). From the time of welding (T1) to the end of welding (T2), an extra high-frequency current is applied to the object to be welded. As a result, the plastic material (material A) is excessively welded. Not only is this a waste of energy, but it also damages the welded material.

On the contrary, in the material C (dotted line graph in FIG. 19), welding time is originally required until T3, but at the end of welding, high frequency current is stopped at T2 even though welding is not completed yet, so welding is performed. There is a shortage.

Therefore, as another conventional control method, a change in the distance between two molds sandwiching objects to be welded having different optimum welding times is determined by the current value supplied to the high-frequency welding processing section of the high-frequency welding apparatus. It is known to detect and control the amount of high-frequency energy supplied to the high-frequency welding processing unit by detecting the current value (see, for example, Patent Document 1).

In this other conventional control method, welding is started with the welding start point when the object to be welded comes into contact with the molds on both sides, and is supplied to the high-frequency welding processing unit as the distance between the molds becomes shorter as the welding progresses. The inflection point at which the current value is increased and the current value reaches its maximum and then converges is defined as the welding completion point. In other words, when the current value passes through the current value (L reference value) at the welding start point, reaches the current value (H reference value) that becomes the inflection point after showing the maximum, is used as the welding completion point. There is.

FIG. 20 shows the relationship between the welding time (S) and the current (A) when the welded objects A, B, and C, which are plastic materials, are welded by another conventional high-frequency welding control method. Similar to FIG. 19, the welding time (S) is taken on the X-axis and the current (A) is taken on the Y-axis.

In FIG. 20, the H reference value, which is the current value at the welding completion point, is measured and examined in advance with an object to be welded having a predetermined size and shape, and is set in the welding apparatus. During work, the transition of the current is detected, the current exceeds the H reference value once, reaches the maximum, and then controls so that the high frequency output stops when the H reference value is reached again, and the welded object is welded. The optimum welding time is adjusted. In the example shown in FIG. 20, the three types of welded objects A, B, and C have the same TS at the welding start point, but the welding completion points are different from TF', TF'', and TF''', respectively, and are optimal. Welding times TA, TB, and TC are assigned. As a result, compared to the conventional example shown in FIG. 19, (1) an excessive welding amount is less likely to occur in the case of a welded material having a short optimum welding time, and (2) a welded material having a long optimum welding time is reduced. In some cases, insufficient welding is reduced.

JP-A-2002-370283

However, in the control method of Patent Document 1, which shows another conventional control method of high-frequency welding, the current value changes during welding, that is, the current value due to the change in the distance between two molds sandwiching the welded object. Welding time is controlled by detecting fluctuations in the welding time. Even if there is a change in the size or shape of the object to be welded, which causes various factors that cause poor welding, welding can be performed under optimum welding conditions. However, the optimum welding conditions are not sought before welding is started.

The first object of the present invention is high-frequency welding capable of obtaining optimum welding conditions that do not cause poor welding before starting welding when the size or shape of the object to be welded changes. It is to provide a method and a high frequency welding apparatus.

Further, the size and shape of the welded object are welded within a certain dimensional tolerance, but in the control method of Patent Document 1, the optimum welding of the combination of the welded objects with the minimum value within the dimensional tolerance is performed. No description or suggestion is made about distinguishing between the conditions and the optimum welding conditions for the combination of the welded objects having the maximum value within the dimensional tolerance, and seeking the more optimum welding conditions for welding.

That is, even if the tolerance required for the dimensions and shape of the welded object is not met, if there is a change in the dimensions and shape of the welded object regardless of the tolerance, the optimum welding conditions at that time are met. Will be welded. The welded object may be out of the tolerance range required for the welded object.

The second object of the present invention is the optimum welding conditions and the dimensional tolerance of the combination of the minimum value of the welded objects within the dimensional tolerance when welding the welded material within a certain dimensional tolerance in terms of size, shape and the like. Provided are a high-frequency welding method and a high-frequency welding apparatus capable of distinguishing between the optimum welding conditions of the combination of the maximum value of the welded objects and the welding conditions before the welded objects are welded and welding in search of more optimum welding conditions. It is to be.

Further, in the control method of Patent Document 1, the L reference value is defined as a countermeasure against troubles such as forgetting to attach the welded object to the mold or dropping the welded object from the mold, and welding is in progress. By confirming the fluctuation of the current value of, the trouble of forgetting to attach the welded object or falling off was prevented.

However, as a process trouble, an object to be welded with a thickness outside the tolerance that should not be the target of welding is mixed in, or two synthetic resin sheets should be welded by mistake, and three synthetic resin sheets are used. There is no description or suggestion of cases where it is placed on a mold. In the control method of Patent Document 1, welding could not be stopped until the welding of the welded object had progressed. Therefore, the welded material that was erroneously welded had to be discarded as a defective product, resulting in a production loss.

The third object of the present invention is that, in addition to forgetting to attach the welded object to the mold and dropping the welded object from the mold, the welded object having a thickness outside the tolerance that should not be the target of welding It is quickly detected before welding that it has been mixed or placed in a state where it is placed in a state where it overlaps more than the specified number, so that the welded object is not welded, and it is placed incorrectly. It is an object of the present invention to provide a high frequency welding method and a high frequency welding apparatus capable of preventing the trouble of production loss such as welding an object and discarding it as a defective product.

The fourth problem of the present invention is to solve the first to third problems of the present invention, particularly the second problem and the third problem at the same time. When (2) the size and shape of the object to be welded fall within the tolerance range allowed for the object to be welded, welding is performed in search of the optimum welding conditions at that time. However, (3) a high-frequency welding method and a high-frequency welding apparatus that do not perform welding are provided when the tolerance is out of the tolerance range allowed for the object to be welded. An object of the present invention is to provide a high-frequency welding method and a high-frequency welding apparatus that produce only non-defective products within the tolerance range required for the object to be welded.

In order to achieve the above object, in the present invention, high frequency energy is applied to a welded object (hereinafter referred to as a model welded object) as a model case for obtaining optimum welding conditions in advance before welding work. Is given, the rise time as rise information is measured until the model welded object reaches a predetermined current value (hereinafter referred to as "measurement reference current value") that is not welded, and based on the measured rise time, A predetermined range of rise time (hereinafter referred to as "rise time range") as a rise information range is determined, and the correspondence between the rise time range and the appropriate welding conditions according to the model welded object is stored and welded. By applying high-frequency energy to the welded object to be worked on and reaching a predetermined current value (measurement reference current value) at which the welded object is not welded, the rise time is acquired and stored as the acquired rise time. By collating a certain rise time range, an appropriate welding condition according to the object to be welded to be welded is selected from the correspondence between the two. Then, the object to be welded is welded according to the selected welding conditions.

Further, in the present invention, a high frequency energy is applied to the model welded object in advance, and the current value (hereinafter referred to as “rising current value”” after a predetermined time (hereinafter referred to as the measurement reference time) during which the model welded object is not welded has elapsed. (Represented) is measured, and a predetermined range of the rising current value as the rising information range (hereinafter referred to as "rising current value range") is determined based on the measured rising current value, and the rising current value range and the model welded object The correspondence with the appropriate welding conditions according to the above is memorized, high-frequency energy is applied to the object to be welded to obtain the rising current value, and the obtained rising current value and the memorized rising current value range are obtained. By collating, the appropriate welding conditions according to the object to be welded to be welded are selected from the correspondence between the two. Then, the object to be welded is welded according to the selected welding conditions.

Further, in the present invention, as the rise time to be memorized, a high frequency is further applied to the model welded material which is a combination of the minimum dimensional tolerances of the welded matter and the model welded material which is a combination of the maximum dimensional tolerances. By applying energy and reaching a predetermined current value at which the two model welded objects are not welded, the rise time is measured, the rise time range is determined based on the measured rise time, and the rise time range and the above Two models The correspondence with the welding conditions according to the welded objects is memorized, and the rise time until the welding target is given high frequency energy to reach a predetermined current value is acquired and acquired. When the rise time is within the stored rise time range, an appropriate welding condition is selected according to the object to be welded. Then, the object to be welded is welded according to the selected welding conditions.

Further, in the present invention, the rising current value to be stored is further divided into a model welded object which is a combination of the minimum dimensional tolerances of the welded objects and a model welded object which is a combination of the maximum dimensional tolerances. By applying high-frequency energy and reaching a predetermined current value at which the two model welded objects do not weld, the rising current value is measured, the rising current value range is determined based on the measured rising current value, and the rising current is determined. The correspondence relationship between the value range and the welding conditions according to the two model welded objects is stored, and the rising current value until a predetermined current value is reached by applying high frequency energy to the welded object to be welded. When the acquired rising current value is within the stored rising current value range, an appropriate welding condition is selected according to the object to be welded. Then, the object to be welded is welded according to the selected welding conditions.

That is, in the present invention, when the acquired rise time is within the stored rise time range, the optimum welding condition of the rise time range is selected. Then, the object to be welded is welded according to the selected welding conditions. If the acquired rise time is not within the stored rise time range, welding of the welded object is not performed.

Alternatively, when the acquired rising current value is within the stored rising current value range, the optimum welding condition of the rising current value range is selected. Then, the object to be welded is welded according to the selected welding conditions. If the acquired rising current value is not within the stored rising current value range, welding of the welded object is not performed.

Then, if the rise time range or the rise current value range is made to correspond to the tolerance range such as the dimensions of the welded object allowed as the welded object, welding is performed within the tolerance range such as the dimensions allowed as the welded object. , No welding is performed outside the tolerance range. As a result, a high-frequency welding method and a high-frequency welding device that produce only non-defective products that fall within the tolerance range such as the dimensions allowed for the welded object are used.

In the present invention, high-frequency energy is applied to the model welded object in advance, and the rise time as rise information is measured until the model welded object reaches a predetermined current value at which it is not welded, and the rise time is based on the measured rise time. As a measure, the rise time range as the rise information range is determined, the correspondence between the rise time range and the welding conditions is stored in the storage unit, and the welding target is not welded when the welding work is performed. The rise time until the current value is reached is measured, the measured rise time is compared with the rise time range stored in the storage unit, and the appropriate relationship according to the welded object to be welded is determined based on the correspondence between the two. Select welding conditions. Then, the welded object to be welded is welded according to the selected welding conditions.

In addition, even when the welding work is repeated and continuously performed one after another, the rise time is measured and the measured rise is reached until the measurement reference current value at which the welded object is not welded is reached each time the welding work is performed. Since the optimum welding conditions are determined according to the object to be welded to be welded by collating the time with the rise time range stored in the storage unit, high-quality welding with little variation should be performed. Can be done.

Further, in the present invention, high-frequency energy is applied to the model welded object in advance, and the rising current value as rising information is measured and the measured rising current until a predetermined current value at which the model welded object is not welded is reached. Based on the value, the rising current value range as the rising information range is determined, the correspondence between the rising current value range and the appropriate welding conditions according to the model welded object is stored, and the welded object to be welded is stored. High-frequency energy is applied to the to obtain the rising current value, and the acquired rising current value is compared with the stored rising current value range. Select. Then, the welded object to be welded can be welded according to the selected welding conditions, and high-quality welding with little variation can be performed.

As a result, even if the size or shape of the object to be welded changes during the actual welding work, the optimum welding conditions that do not cause poor welding are selected before the object to be welded is welded. Then, the first problem of the present invention of providing a high-frequency welding method and a high-frequency welding apparatus capable of welding a welding target according to selected welding conditions is solved.

An object to be welded whose dimensions and shape are within a certain tolerance, specifically, for example, a synthetic resin sheet when the thickness of the synthetic resin sheet is within a certain tolerance and is considered to be a good product. Even if the thickness of the welded object composed of Can be welded. And the welded object whose size and shape are within a certain tolerance, for example, when the thickness of the welded object is thin, the welding does not become excessive, sparks do not occur, and when the thickness of the welded object is thick, the welding is not insufficient, and it is stable. It is possible to provide a high-frequency welding method and a high-frequency welding apparatus capable of high-frequency welding.

As a result, when welding an object to be welded within a certain dimensional tolerance in terms of size, shape, etc., the optimum welding conditions for the combination of the minimum value of the welded objects within the dimensional tolerance before the welded object is welded. And the optimum welding condition of the combination of the welded objects having the maximum value within the dimensional tolerance are distinguished, and the more optimum welding condition is selected. Then, the second problem of the present invention of providing a high-frequency welding method and a high-frequency welding apparatus capable of welding a welding target according to selected welding conditions is solved.

Furthermore, in addition to troubles such as forgetting to attach the welded object to the mold or dropping the welded object from the mold, if a material or thickness of the welded object different from the material to be welded is mixed, the welded object is covered. Even if the welded objects are placed in a state where they are overlapped outside the specified range, an abnormality occurs when the rise time until the welded object reaches the measurement reference current value where it is not welded is measured before welding. It is automatically determined that the state is in a state, an abnormality is displayed on the display unit without welding, and the welding work is completed. Since the welded material can be taken out from the mold before being welded and the correct welded material can be placed again, it is possible to prevent the occurrence of production loss in which the welded material is mistakenly welded and discarded.

As a result, in addition to troubles such as forgetting to attach the welded object to the mold and dropping the welded object from the mold, the welded object with a thickness outside the tolerance that should not be the target of welding may be mixed. It is said that it is quickly detected before welding that it is placed in a state where it is placed in a state where it overlaps more than the specified number of sheets, and welding is not performed, and the welded object placed by mistake is welded and discarded as a defective product. The third problem of the present invention of providing a high-frequency welding method and a high-frequency welding apparatus capable of preventing troubles of production loss is solved.

Then, by simultaneously solving the above-mentioned first to third problems of the present invention, particularly the second and third problems, (1) when the size and shape of the welded material are changed. (2) When the size and shape of the object to be welded fall within the tolerance range allowed for the object to be welded, welding is performed under the optimum welding conditions at that time. However, (3) a high-frequency welding method and a high-frequency welding apparatus that do not perform welding are provided when the tolerance is out of the tolerance range allowed for the object to be welded. Then, the fourth problem of the present invention of providing a high-frequency welding method and a high-frequency welding apparatus for producing only non-defective products within the tolerance range allowed as a welded object is solved.

The external perspective view of the high frequency welding apparatus which concerns on 1st Embodiment of this invention. The schematic block diagram of the high frequency welding apparatus which concerns on 1st Embodiment of this invention. The flow chart which showed the procedure of the welding control method which concerns on 1st Embodiment of this invention. The figure which showed the transition of the electric current of the welding control method concerning the 1st Embodiment of this invention. The figure which showed the transition of the electric current of the welding control method concerning the 2nd Embodiment of this invention. The figure which showed the other example of the rise information of the welding control method which concerns on 1st and 2nd Embodiment of this invention. The figure which exemplifies the kind of the thickness of the model welded object for measuring the rise time of the welding control method which concerns on 3rd Embodiment of this invention. The flow chart which showed the procedure which measured and memorized the rise time of the welding control method which concerns on 3rd Embodiment of this invention. (A) (b) Model of the welding control method according to the third embodiment of the present invention The figure which showed the correspondence relationship between the thickness of the welded object and the rise time. (A) (b) (c) The figure which showed the correspondence relationship between the rise time range of the model weld, and the welding condition stored in the storage part of the welding control method which concerns on 3rd Embodiment of this invention. The flow chart which showed the procedure of the welding control method which concerns on 3rd Embodiment of this invention. The figure which showed the transition of the electric current of the welding control method concerning the 3rd Embodiment of this invention. The figure which showed the transition of the electric current of another welding control method concerning the modification of the 3rd Embodiment of this invention. The figure which exemplifies the kind of the thickness of the welded object for measuring the rise time of the welding control method which concerns on 4th Embodiment of this invention. (A) (b) The figure which showed the correspondence relationship between the thickness of the welded object and the rise time of the welding control method which concerns on 4th Embodiment of this invention. The flow chart which showed the procedure of the welding control method which concerns on 4th Embodiment of this invention. The figure which shows the change of the rise time in the aspect which changes the measurement reference current value according to the anode current immediately after oscillation at the time of preparation of this invention. The flow chart which showed the procedure which changed the measurement reference current value according to the anode current immediately after oscillation at the time of the pre-preparation of this invention. The figure which showed the transition of the electric current at the time of welding in the conventional welding control method. The figure which showed the transition of the electric current at the time of welding in other conventional welding control methods.

(First Embodiment of the present invention)
The present invention applies high-frequency energy to the model welded object, measures the rise information until it reaches a predetermined current value at which the model welded object does not weld, and determines the rise information range based on the measured rise information. Then, the correspondence between the rise information range and the welding conditions according to the model welded object is stored, and high frequency energy is applied to the welded object to be welded to acquire the rise information until a predetermined current value is reached. Then, by collating the acquired rise information with the stored rise information range, an appropriate welding condition according to the welded object to be welded is selected from the correspondence relationship, and the welded object to be welded is selected according to the selected welding condition. The welded material is welded.

In the first embodiment of the present invention, as the rise information until the welded object reaches a predetermined current value that is not welded, the rise time until the welded object reaches a predetermined current value that is not welded is used. I will explain the case.

FIG. 1 shows an external perspective view of the high-frequency welding device 1 according to the present embodiment. In FIG. 1, the upper mold 2 and the lower mold 3 are arranged on the anvil 70 so as to face each other at regular intervals. By placing the welded object 4 on the lower mold 3, the welded object 4 is arranged between the upper mold 2 and the lower mold 3. Further, when the operator steps downward on the foot lever 71 extending under the anvil 70, the pressing portion 5 acts to lower the upper mold 2 toward the lower mold 3, and the upper mold 2 and the upper mold 2 The welded object 4 is sandwiched between the lower molds 3. The high-frequency welding device 1 contains a tuning circuit 6, an oscillation circuit 7, an ammeter 8, a high-voltage power supply 9, a control unit 10, and a storage unit 11, which are operated to form an upper mold 2 and a lower mold 3. High-frequency energy is applied to the sandwiched object 4 to be welded. Further, in addition to the welding time and the current value, characters and marks indicating an abnormal state are displayed on the display unit 12.

FIG. 2 shows a schematic configuration diagram of the high-frequency welding device 1 according to the present embodiment, and describes the configuration and operation of each part such as the tuning circuit 6. In the high-frequency welding apparatus 1 according to the present embodiment shown in FIG. 2, a predetermined interval is provided so as to sandwich the welded object 4 in which two vinyl chloride sheets (4a, 4b), which are synthetic resin sheets, are stacked from above and below. The upper mold 2 and the lower mold 3 are arranged after opening. In the following, unless otherwise specified, a pair of synthetic resin sheets stacked on top of each other will be described as one welded object. In FIG. 2, a pressing portion 5 for moving the upper mold 2 so as to press it from above the welded object 4 is arranged. When the welding work is started, the object to be welded 4 is sandwiched between the upper mold 2 and the lower mold 3 in contact with each other, and receives a constant pressure by the pressing portion 5. The upper mold 2 and the lower mold 3 are in contact with the tuning circuit 6 and the oscillation circuit 7 by the power supply cable 20. Further, the tuning circuit 6 is in contact with the oscillation circuit 7 by the power supply cable 20. Further, the oscillation circuit 7 is communicated with the high voltage power supply 9.

In the first embodiment, the ammeter 8 is mounted at a position before entering the oscillation circuit 7 from the high-voltage power supply 9 in order to measure the high-frequency energy supplied to the welded object 4, and is supplied from the high-voltage power supply 9. The anode current is being measured. The anode current and the high-frequency current flowing through the upper mold 2 and the lower mold 3 have a correlation, and correspond to the high-frequency energy supplied to the welded object 4. It is difficult to accurately measure the high-frequency current flowing through the upper mold 2 and the lower mold 3, but by measuring the anodic current of the DC current that can be measured stably, the high-frequency energy supplied to the welded object 4 can be obtained. Can be grasped accurately.
The current flowing through the oscillation circuit 7 and the high-voltage power supply 9 at the time of welding is, for example, about 0.2 to 5.0 amperes when the oscillation circuit 7 is a vacuum tube type, so if the current in that range can be measured. , The ammeter 8 is not particularly limited.

The oscillation circuit 7 converts the anode current supplied from the high-voltage power supply 9 into a high-frequency current. Further, the tuning circuit 6 can change the magnitude of the high frequency current received from the oscillation circuit 7 by adjusting the capacitance of the tuning capacitor. As an example, the tuning circuit 6 is composed of an air capacitor in which a pair of plate electrodes supported by an insulating support material are opposed to each other and are provided so as to be able to move apart from each other. In the air capacitor, the movable electrode plate moves back and forth with respect to the fixed electrode plate due to the rotation of the feed screw by the motor, so that the electrode spacing changes and the capacitance is adjusted, and as a result, the high frequency current or the corresponding anode current increases or decreases.

The operation period of the oscillation circuit 7 is controlled by the oscillation control signal supplied from the control unit 10 to change the welding time, and the capacitance of the tuning capacitor of the tuning circuit 6 is adjusted by the tuning control signal supplied from the control unit 10. By changing the high-frequency current flowing through the upper mold 2 and the lower mold 3, the magnitude of the high-frequency energy given to the welded object 4 can be changed. In this way, the tuning circuit 6, the oscillation circuit 7, and the high-voltage power supply 9 function as high-frequency energy supply units that provide high-frequency energy for welding the welded object 4. That is, the control unit 10 can control the tuning circuit 6, the oscillation circuit 7, and the high-voltage power supply 9 to control the welding conditions for the welded object 4. Welding conditions include high-frequency current supplied to the object to be welded, welding time which is the supply time of the high-frequency current supplied to the object to be welded, pressing force by the pressing portion, high-frequency voltage supplied to the object to be welded, and supply to the object to be welded. There are frequencies of high-frequency current and high-frequency voltage.

In the present embodiment, instead of the high-frequency current supplied to the welded object described above, an anodic current correlating with the high-frequency current is used to weld the anodic object to be welded, and the anodic current required for welding the welded object (hereinafter referred to as the target welding current). Represented). The welding time is, for example, the time from the start to the stop of oscillation of the oscillation circuit 7 in which a high-frequency current is supplied to the welded object.

Although it has already been explained that the anode current supplied from the high-voltage power supply 9 when the object to be welded 4 is welded is about 0.2 to 5.0 amperes when the oscillation circuit 7 is a vacuum tube type. In the embodiment, the rise time of the current value until the object 4 to be welded reaches the measurement reference current value at which it is not welded is measured. The measurement reference current value is arbitrarily set within a range in which the welded object is not welded, and is a current value smaller than the anode current (target welding current) when the above-mentioned welded object 4 is welded. Although it is 50 milliamperes, it is appropriately set according to the thickness and material of the welded object 4. In addition, "the welded object is not welded" means a state before the pair of synthetic resin sheets constituting the welded object start to be joined to each other.

The storage unit 11 connected to the control unit 10 stores the welding time, the anode current value, and the like, which are welding conditions, in association with each other. In addition to the welding conditions such as the welding time and the anode current value, the display unit 12 connected to the control unit 10 displays characters and marks indicating an abnormal state and functions as an interface with the operator.

In the high-frequency welding apparatus 1 of the present embodiment having the above configuration, the rising time of the anode current until the object 4 to be welded reaches the measurement reference current value at which it is not welded is acquired and determined. Then, by collating the acquired rise time with the rise time range stored in the storage unit 11, appropriate welding conditions according to the object to be welded are selected and welded. That is, when the oscillation circuit 7 is operated and high frequency energy is applied to the welded object 4 sandwiched between the upper mold 2 and the lower mold 3 via the tuning circuit 6, the two synthetic resins constituting the welded object 4 are formed. Collision, vibration, and friction occur at the molecular level inside the sheet, which generates heat and melts. Since the upper mold 2 and the lower mold 3 are pressed from above by the pressing portion 5, welding occurs as the joint surfaces of the two synthetic resin sheets constituting the welded object 4 are melted. Progresses and is joined.

Next, the welding control method according to the first embodiment will be described with reference to the flowchart of FIG. 3 and the graph of the current waveform of FIG. In the following description, including other embodiments, the main body that executes the welding control is mainly the control unit 10 of the high frequency welding device 1. In the flowchart of FIG. 3, as a preliminary preparation for the welding work, the correspondence relationship between the rise time until the measurement reference current value in the model welded object is reached in the storage unit 11 and the appropriate welding conditions according to the model welded object. The procedure for storing the above (step ST0) and the welding operation procedure for actually welding the welded object 4 to be welded are shown from step S1 to the end step S9. In the graph of the current waveform of FIG. 4, the welding time (S) is taken on the X-axis and the anode current (A) is taken on the Y-axis to show the time transition of the anode current.

Hereinafter, the flowchart of FIG. 3 and the transition of the current shown in FIG. 4 will be described in comparison with each other. In the flowchart of FIG. 3, first, as a preliminary preparation, a welded object DA in which synthetic resin sheets having a thickness of the median dimensional tolerance are stacked is prepared as a model welded object until the measurement reference current value is reached. The rise time tA of the above is measured, the rise time range based on the measured rise time tA is determined, and the correspondence between the rise time range and the welding condition A appropriate for the welded object is stored in the storage unit 11. Keep it (ST0). In the present embodiment, as an example, the rise time range will be described as plus or minus 20% of the rise time tA obtained above. Under welding condition A, the target welding current is Iw and the welding time is TAA. That is, for welding condition A, when the anode current is increased from the start of welding (start of oscillation) to Iw to complete welding of Iw. It will be described as the target welding current of No. 1 and the flow up to the time TAA. In this way, by performing the preliminary preparation, the welding condition A for the model welded object as a reference is stored in the storage unit 11. The welding condition A of the model welded object is also stored in association with a rise time range having a predetermined width (plus or minus 20%) with respect to the rise time tA up to the measurement reference current value. If the storage unit 11 already stores information about the model welded object, the step of ST0 may be omitted and the model may be started from ST1.

Next, when the welded object 4 to be welded, which is the product itself or a part of the product, is set in the high-frequency welding device 1, and the welding operation for actually welding the welded object 4 to be welded is started (ST1). The upper mold 2 descends (ST2) with the welded object 4 placed on the lower mold 3, and the welded object 4 rises from the time when the upper mold 2 descends to the surface of the welded object. It is sandwiched between the mold 2 and the lower mold 3 and pressed by the pressing portion 5 (ST3). Next, when the operation of the oscillation circuit 7 starts (oscillation starts), the anode current starts to flow, and at the same time, the measurement of the rise time is started (ST4, the origin of the graph in FIG. 4), and the anode current reaches the predetermined measurement reference current value It. When it reaches, the measurement of the rise time is finished (ST5). The measurement reference current value It of ST4 is a current value at which the welded object 4 is not welded, and is 20 to 50 mA as an example, but is appropriately set according to the thickness of the welded object 4.

In step ST0, the storage unit 11 of the welding apparatus stores the rise time range based on the rise time tA and the welding condition A in association with each other. Is acquired, the rise time acquired in ST6 or later is compared with the stored rise time range of the model welded object, and the welding condition A corresponding to the welded object 4 to be welded is selected and stored. It is read from the part 11 and the welded object 4 is welded under the condition.

Specifically, in step ST6, when the rise time t of the welded object 4 belongs to the rise time range within plus or minus 20% of the rise time tA of the model welded object (YES in ST6), the welded object 4 Welding is performed under the target welding current Iw, which is an appropriate welding condition, and the welding condition A of the welding time TAA (ST7, the range of the shaded line in FIG. 4). On the other hand, if the rise time t of the welded object 4 does not fall within the time range within plus or minus 20% of the rise time tA of the model welded object (NO in ST6), the welding is not performed (the welding operation is stopped) (stops the welding operation). ST8) Finish the work (ST9).

In ST8, the step was simply "not welded", but "not welded" is expressed as one welding condition X, and the rise time t is the plus or minus of the rise time tA of the model welded object. When it does not belong to the time range within 20%, that is, when ST6 is NO, the "welding condition X" of "no welding" may be performed.

In the present invention, the rise information range (rise range in the present embodiment) is determined based on the rise information (rise time in the present embodiment) of the model welded object. That is, as in the present embodiment, the range including the rise information (rise time tA) of the model welded object (within plus or minus 20% of the rise time tA) is set as the rise information range, and welding is performed under "welding condition A" in that range. You may. It is not always necessary to include the rise information of the model welded object in the rise information range. For example, the range that does not include the rise information is set as the rise information range, and "welding condition X (no welding)" is performed within that range. You may.

As a method of specifically storing the rise information range of the model welded object in the storage unit 11, as described in the present embodiment, the rise information (time) of the model welded object and the rising edge of the model welded object are obtained. A fixed percentage value based on information (time) may be stored as a rising information range. Further, the range of the lower limit percentage and the range of the upper limit percentage calculated based on the rise information (time) of the model welded object may be stored as the rise information range.

To reiterate, the high-frequency welding device of the present embodiment presses the welded object by sandwiching it between two molds arranged at a predetermined interval so as to sandwich the welded object and the two molds. A pressing part, a high-frequency energy supply part that is sandwiched between two molds to supply a high-frequency current to the welded object, and a high-frequency energy supply to the welded object until the welded object reaches a predetermined current value that does not weld. A high-frequency welding device including a rise information measuring means for measuring rise information, a rise information range determining means for determining a rise information range based on the measured rise information, and a storage unit and a control unit. , The storage unit stores the rise information range based on the measured rise information in association with the welding conditions for welding the welded object, and the control unit stores the welded object when welding the welded object. Rise information is acquired from the measuring means, the acquired rise information is collated with the stored rise information range, welding conditions are selected from the correspondence, and the welded object is welded according to the selected welding conditions. There is.

As a result, even if the size or shape of the welded object changes during the actual welding work, the optimum welding conditions are selected so that the welded object does not cause welding defects before the welded object is welded. It solves the first problem of this embodiment which provides a high frequency welding method and a high frequency welding apparatus capable of performing welding.

(Second Embodiment of the present invention)
In the second embodiment of the present invention, as rising information until the welded object reaches a predetermined current value at which the welded object is not welded, a predetermined time elapses after applying high frequency energy to the welded object (hereinafter, measurement reference time). The case where the anode current (hereinafter referred to as the rising current value) of (represented as), that is, the rising current value until the welded object reaches a predetermined current value without welding will be described.

FIG. 5 shows the transition of the current of the welding control method according to the second embodiment. In the graph of the current waveform of FIG. 5, the welding time (S) is taken on the X-axis and the anode current (A) is taken on the Y-axis.

In the second embodiment, as a preliminary preparation, a model welded object DB in which synthetic resin sheets having a thickness of the median dimensional tolerance are stacked is used to obtain a range of rising current values at the time of measurement reference and welded. An appropriate welding condition B corresponding to the object DB is obtained, and the correspondence between the two is stored in the storage unit 11. In FIG. 5, as an example, the range of the rising current value is the range of plus or minus 20% of the rising current value IB obtained by the welded object DB, the target welding current is Iw, and the welding time is TBB under the welding condition B.

When the oscillation circuit 7 starts oscillating (the origin of the graph in FIG. 5), the anode current flows, and when the predetermined measurement reference time t1 is reached, the rising current value is measured. Here, the maximum value (IB plus 20%) in the range of the rising current value is set to t1 at the measurement reference time so that the current value at which the welded object is not welded is set. As an example, it is 20 to 50 mA, but it is appropriately set depending on the thickness of the welded object.

When the rising current value I of the object to be welded to be welded is measured, the range of the rising current value of the model welded object and the welding condition B are stored in association with each other in the storage unit 11 of the high frequency welding device 1. When the rising current value I belongs to the range of the current value within plus or minus 20% of the rising current value IB of the model welded object at t1 at the measurement reference time, the welding condition B, which is an appropriate welding condition for the welded object, is used. Welding is performed (diagonal line in FIG. 5). On the other hand, if the rising current value I does not fall within the range of the rising current value IB of the model welded object within plus or minus 20% at t1 at the measurement reference time, the work is terminated without welding.

As a result, even if there is a change in the size or shape of the welded object to be welded during the actual welding work, welding is performed under the optimum welding conditions that do not cause welding defects before the welded object is welded. It solves the first problem of the present embodiment which provides a high frequency welding method and a high frequency welding apparatus capable of performing the above.

In the above description, in the first embodiment of the present invention, the case where the rise time is used as the rise information until a predetermined current value at which the welded object is not welded reaches a predetermined current value has been described. In the second embodiment of the present invention, the case where the rising current value is used as the rising information until a predetermined current value at which the welded object is not welded reaches a predetermined current value has been described.

If necessary, as long as the rising information until the adherend of the present embodiment reaches a predetermined current value that is not welded, for example, the ratio of the rising current value (Y) to the rising time (X) shown in FIG. (R = Y / X) ”,“ Rise current value (Y) increase rate per unit time (X) of rise (R = Y / X) ”and“ Rise current value rise angle (θ = arctangent (θ = arctangent) Rise information such as Y / X)) ”may be used.

When using information such as the rise current value ratio, increase rate (R), and rise angle (θ) of the rise current value, the rise current value ratio, increase rate (R), and rise current value are stored in the storage unit 11 in advance. Information such as the rising angle (θ) of is stored. Then, the control unit 10 uses the measured rise information "rise time" and "rise current value" to provide information such as the ratio of the rise current value, the rate of increase (R), and the rise angle (θ) of the rise current value. Is created, collated by the same control method as in the first embodiment and the second embodiment, and the welding conditions according to the welded object to be welded are selected from the correspondence between the two. Then, the welded object to be welded is welded according to the selected welding conditions.

When using information such as "ratio of rising current value to rising time (R)", "increasing rate of rising current value per unit time of rising (R)", "rising angle of rising current value (θ)", etc. Can select welding conditions in a shorter time before the object to be welded reaches a predetermined current value at which it does not weld.

(Third Embodiment of the present invention)
In the third embodiment of the present invention, when the thickness of the adherend made of synthetic resin is within a certain tolerance, it is considered as a good product, and the thickness of the welded object fluctuates within the tolerance. However, a high-frequency welding method and a high-frequency welding apparatus in which welding is performed under optimum welding conditions will be described.

Specifically, if the thickness of the synthetic resin sheet to be welded is within a certain tolerance, it is considered as a good product, and the welded object is composed of two synthetic resin sheets. The case where the thickness of the above varies as a combination of two synthetic resin sheets within the tolerance will be described as an example.

In order to ensure that the thickness of the welded object is welded under the optimum welding conditions even if it fluctuates within the tolerance, the rise time range that is set in advance before the welding work corresponds to the tolerance of the welded object. It is necessary to store it in the storage unit 11 as a result. Hereinafter, a description will be given with reference to FIGS. 7 to 10.

As shown in FIG. 7, if the minimum value of the thickness of the synthetic resin sheet constituting the welded object within the dimensional tolerance is D1 (lower limit of tolerance) and the maximum value is D2 (upper limit of tolerance), model welding is performed. The thickness of the object is between the thickness Da (= 2 × D1), which is a combination of the thinnest minimum values D1, and the thickness Dc (= 2 × D2), which is a combination of the thickest maximum values D2. The thickness Db (= D1 + D2) in which the minimum value D1 and the maximum value D2 are combined can be shown as a typical example. For model welded objects with three different thicknesses, Da, Db, and Dc, as a preliminary preparation before welding work, an anode current smaller than the target current is passed to measure the rise time, and the thickness and rise of the model welded object are measured. Explain how to find the relationship with time.

FIG. 8 shows a flowchart showing a procedure for measuring and storing the rise time in advance as a preliminary preparation before the welding work. First, an example of a model welded object having a thickness of Da will be described. With the model welded object of thickness Da placed on the lower mold 3, the rise time measurement is started (ST11), and when the upper mold 2 is lowered (ST12), the model welded object is on the top. It is sandwiched between the mold 2 and the lower mold 3 in contact with the lower mold 3 and pressed by the pressing portion 5 (ST13). Next, the operation of the oscillation circuit 7 is started (oscillation starts), the anode current is passed (ST14), the rise time until the measurement reference current value It is reached is measured, and the rise time is stored in the storage unit 11 (ST15).

The measurement reference current value It, which is the reference value for measuring the rise time in ST15, is appropriately set according to the thickness of the model welded object, and is the current value at which the model welded object is not welded. As an example, it is 20 to 50 milliamperes as described in the flowchart of FIG.

By performing the operations of ST11 to ST15 in the same manner for the model welded objects having different thicknesses (thicknesses Db and Dc), the rise time of the model welded objects having three kinds of thicknesses Da, Db and Dc can be obtained.

FIG. 9A shows the transition of the anode current when the rise time is measured for each of the three types of model welded objects having thicknesses Da, Db, and Dc. In FIG. 9A, the welding time (S) is taken on the X-axis and the anode current (A) is taken on the Y-axis. If the thickness is different within the tolerance of the synthetic resin sheet, the difference in the thickness of the model welded object is relatively small, so the anode current up to the time tk immediately after the start of oscillation (hereinafter referred to as the initial rise time). The slopes of the above are almost the same regardless of the difference in thickness, and the rise of the anode current up to the anode current Ik at the initial rise time tk is represented by a single line in FIG. 9A.

Next, FIG. 9 (b) describes a method of determining the range of the rise time for determining the welding conditions from the rise time of the anode current up to the measurement reference current value It in the model welded objects having three types of thicknesses Da, Db, and Dc. ) To explain. In FIG. 9B, the welding time (S) is taken on the X-axis and the thickness of the model welded object is taken on the Y-axis. Assuming that the rising times of the anode currents up to the measurement reference current value It of the model welded objects of thickness Da, Db, and Dc are ta, tb, and tc, respectively, the model welded objects of each model are welded as shown in FIG. 9 (b). Plot the relationship between the thickness of the object and the rise time, and if the thickness and the rise time have a nearly linear relationship, the time range from the rise time ta of the thinnest model welded object to the rise time tk of the thickest model welded object. The first time tb1 and the second time tb2 are obtained.

Then, the range from the rise time ta of the thinnest model welded object to the first time tb1 is defined as the time range I to which the welding condition I is applied. The range beyond the first time tb1 to the second time tb2 is defined as the time range II to which the welding condition II is applied. The range from the second time tb2 to the rise time ct of the thickest model welded object is defined as the time range III to which the welding condition III is applied. The time ranges I to III are stored in the storage unit 11 in association with the welding conditions I, II, and III of the model welded objects having three types of thicknesses Da, Db, and Dc, respectively.

The method of determining the rise time range is a combination of the maximum value combination Da and the minimum value within the dimensional tolerance when it is known in advance that the relationship between the thickness of the model welded object and the rise time is linear. Only the rise time of Dc needs to be measured and divided into three equal parts. In addition, the division method can be appropriately set such as dividing into two equal parts and four equal parts.

On the other hand, welding conditions for good welding with three types of thicknesses Da, Db, and Dc model welded objects were obtained by welding experiments in advance. It is stored in the storage unit 11 in association with I, II, and III. In this way, the correspondence table between the rise time range and the welding conditions shown in FIGS. 10A to 10C is stored in the storage unit 11.

As a specific example of welding conditions, when the target welding current is Iw, the welding times T1, T2, and T3, which are good welding for the model welded objects having three kinds of thicknesses Da, Db, and Dc, are set in advance. It is obtained by performing a welding experiment, and is stored in the storage unit 11 in association with the welding conditions I to III.

FIG. 10A shows a correspondence table between the time range of the rise time of the model welded object stored in the storage unit 11 and the welding conditions. Time range I (from ta to tb1) of rise time and welding condition I (welding time T1, target welding current Iw), time range II (over tb1 to tb2) and welding condition II (welding time T2, target welding current Iw) ), The time range III (exceeding tb2 to tc) and the welding condition III (welding time T3, target welding current Iw) are stored in association with each other.

As a result, when the rise time of the welded object to be welded is measured during the welding work, it corresponds to the time range to which the measured rise time belongs by collating with the rise time range based on the table explained above. The welding conditions are selected and can be read from the storage unit 11.

The welding conditions can be set by changing the target welding current according to the thickness of the object to be welded, in addition to changing the above-mentioned welding time. When the thickness of the welded object is thin, the target welding current is reduced to prevent excessive welding, and when the thickness of the welded object is thick, the target welding current is increased to prevent insufficient welding.

FIG. 10B shows a correspondence table between the time range of the rise time and the welding condition when the target welding current is changed as the welding condition. Time range I (from ta to tb1) of rise time and welding condition IV (welding time Tw, target welding current I1 ), time range II (over tb1 to tb2) and welding condition V (welding time Tw, target welding current I2) ), The time range III (exceeding tb2 to tc) and the welding condition VI (welding time Tw, target welding current I3) are associated and stored.

The welding conditions may be set by changing both the welding time and the target welding current. When the thickness of the welded object is thin, the welding time is shortened under welding condition VII and the target welding current is also reduced to prevent excessive welding. When the thickness of the welded object is thick, the welding time is lengthened under welding condition IX and the target is Insufficient welding can be prevented by increasing the welding current.

FIG. 10C shows a correspondence table between the time range of the rise time and the welding condition when both the welding time and the target welding current are changed as the welding conditions. Time range I (from ta to tb1) of rise time and welding condition VII (welding time T4, target welding current I4), time range II (over tb1 to tb2) and welding condition VIII (welding time T5, target welding current I5) ), The time range III (exceeding tb2 to tc) and the welding condition IX (welding time T6, target welding current I6) are associated and stored.

Further, the welding conditions are not limited to the examples shown in FIGS. 10A to 10C, and various combinations of the welding time and the target welding current can be considered. In addition to the welding time and the target welding current, there are various parameters related to welding such as changing the pressure for pressurizing the object to be welded as parameters of the welding condition, and the welding condition may be set by combining these.

Above, prior to the welding operation has been described to store the correspondence relation between the rise time range and the welding conditions of the model to be weld deposit in the storage unit 11.

Next, the flowchart of FIG. 11 and FIG. 12 show how the welding conditions I to III are selected according to the thickness of the welded object to be welded during the welding operation and the welded object is welded. The transition of the anode current will be described in comparison. In the flowchart of FIG. 11, the procedure for welding the welded object is shown from step S20 to the end step S32. In the graph of the current waveform of FIG. 12, the welding time (S) is taken on the X-axis and the anode current (A) is taken on the Y-axis, and the time transition of the measured value of the anode current when welding the welded object is shown.

In the flowchart of FIG. 11, as a preliminary preparation (ST20) for starting the welding operation (ST21), the rise time until reaching the measurement reference current value is measured using the model welded object, and based on the measured rise time, the rise time is used. It has already been described with reference to FIGS. 7 to 10 that the rise time range is determined and the correspondence between the rise time range and the appropriate welding conditions according to the model welded object is stored in the storage unit 11. That's right.

When the welding operation is actually started on the welded object 4 to be welded (ST21), the upper mold 2 is lowered (ST22) with the welded object 4 placed on the lower mold 3 and is moved up. From the time when the mold 2 descends to the surface of the welded object 4, the welded object is sandwiched between the upper mold 2 and the lower mold 3 and pressed by the pressing portion 5 (ST23). Next, when the operation of the oscillation circuit 7 starts (oscillation starts), the anode current starts to flow, and at the same time, the measurement of the rise time is started (ST24, the origin of the graph in FIG. 12), and the anode current reaches a predetermined measurement reference current value It. When it reaches, the measurement of the rise time is finished (ST25). The measurement reference current value It of ST24 is a current value at which the welded object is not welded, and is, for example, 20 to 50 mA, but is appropriately set according to the thickness of the welded object.

Since the appropriate welding conditions corresponding to the rise time range are stored in the storage unit 11 of the welding device in step S20, when the rise time is measured in ST25, the welding conditions corresponding to the rise time are selected and stored in the storage unit. It is read from No. 11 and the welded object is welded under the conditions.

Specifically, in step ST26, for example, when the rise time of the welded object 4 is t1 and belongs to the time range I from the rise time ta of the thinnest model welded object to the first time tb1 (step ST26). YES), the welding condition I of the model welded object having the thinnest thickness Da is selected, and the welded object 4 is welded under the selected conditions (ST27, alternate long and short dash line in FIG. 12). On the other hand, when ST26 is NO and the rise time of the welded object 4 is t2 in step ST28 and belongs to the time range II from the first time tb1 to the second time tb2 (step ST28). Yes), the welding condition II of the model welded object having a thickness of Db is selected, and the welded object 4 is welded under the selected conditions (ST29, solid line in FIG. 12). Further, ST28 is also NO, and in step ST30, for example, the rise time of the welded object 4 is t3, which exceeds the second time tb2 and reaches the rise time tc of the model welded object having the thickest thickness Dc. When it belongs to the range III (YES in step ST30), the welding condition III of the model welded object having the thickest thickness Dc is selected, and the welded object 4 is welded under the selected conditions (ST31, FIG. 12). dotted line). When ST30 is also NO, that is, when the rise time t of the welded object 4 is shorter than the rise time ta of the thinnest model welded object or longer than the rise time tc of the thickest model welded object. Determines that the thickness of the sheet constituting the welded object 4 is out of the tolerance range, and stops the welding operation at this point to end the welding operation (ST32).

As for the welding conditions, the high frequency energy given to the welded object 4 can be changed by changing the welding time by controlling the operating period of the oscillation circuit 7. In FIG. 12, the welding conditions I (welding time T1), II (welding time T2), and III (welding time T3) are set by changing the welding time with the target welding current as Iw.

As described above, in the welding control method according to the third embodiment, even if the thickness of the welded object is within the dimensional tolerance of the sheet, if there is a difference in the thickness of the welded object, it is more optimal. By selecting the welding conditions, it is possible to prevent excessive welding and insufficient welding, and perform high-quality welding with little variation. In particular, when the material to be welded is composed of a sheet having an extremely thin thickness, a slight difference in thickness that cannot be seen or touched by humans affects the welding quality, which is effective.

Further, in the actual welding operation process, when the sheet is cut from the roll and continuously welded, the pressure applied to the sheet in the rolled state differs between the start and end of the roll, or the center and the edge. Therefore, the thickness of the synthetic resin sheet may be slightly different. Even if the thickness of the sheet differs for each welding operation, the rise time is measured each time the welding starts, and the appropriate welding conditions corresponding to the thickness of the object to be welded are selected. Good welding can be performed.

Further, in the third embodiment, the case where the same material (vinyl chloride sheet) as the welded material has a different thickness has been described as an example, but the material to be welded may be different. For example, even if the welded objects have the same thickness, the materials are different. Therefore, when the welding conditions are different, the correspondence between the rise time and the welding conditions for the welded objects having different materials is stored in the storage unit in advance. By doing so, welding can be performed under appropriate welding conditions according to the material.

As described above, in the third embodiment of the present invention, the welded material composed of the sheet having the minimum value within the dimensional tolerance before the welded material within a certain dimensional tolerance in terms of size, shape, etc. is welded. Optimal welding conditions for the combination, a combination of welded objects composed of sheets with the maximum value within the dimensional tolerance, and a combination of welded objects composed of sheets with intermediate values within the dimensional tolerance. The second problem of the present invention is solved to provide a high-frequency welding method and a high-frequency welding apparatus capable of welding in search of more optimum welding conditions.

(Modified Example of Third Embodiment of the Present Invention)
In the modified example of the third embodiment of the present invention, the target welding current is set by changing the welding conditions according to the thickness of the welded object. With reference to FIG. 13, a state in which VI is selected from the welding conditions IV according to the thickness of the welded object during the welding operation and the welded object is welded will be described. In the graph of the current waveform of FIG. 13, the welding time (S) is taken on the X-axis and the anode current (A) is taken on the Y-axis, and the time transition of the measured value of the anode current when welding the welded object is shown.

As a preliminary preparation for starting the welding operation, according to the content described in FIG. 10 (b) of the third embodiment, the rise time when the measurement reference current is reached using the model welded object and the model welded object. The correspondence relationship with the appropriate welding conditions is stored in the storage unit 11.

When the welding work is started, the welded object 4 to be welded is sandwiched between the upper mold 2 and the lower mold 3 and pressurized, and the anode current flows when the oscillation starts and the measurement of the rise time is started (graph of FIG. 13). origin). When the anode current reaches a predetermined measurement reference current value, the measurement of the rise time is completed. Then, a welding condition is selected according to the measured rise time, the welding condition selected from the table of FIG. 10B stored in the storage unit 11 is read out, and the welded object 4 is welded under that condition. NS.

For example, when the rise time of the welded object 4 is t1 and belongs to the time range I from the rise time ta of the thinnest model welded object to the first time tb1, the welding condition IV is selected, and the welding condition IV is selected under the selected conditions. The object to be welded 4 is welded (one-dot chain line in FIG. 13). When the rise time of the welded object 4 is t2 and belongs to the time range II beyond the first time tb1 and up to the second time tb2, the welding condition V is selected, and the welded object 4 is welded under the selected conditions. (Solid line in FIG. 13). When the rise time of the welded object 4 is t3, which exceeds the second time tb2 and belongs to the time range III up to the rise time tc of the thickest model welded object, the welding condition VI is selected and is coated under the selected conditions. The welded material 4 is welded (dotted line in FIG. 13).

The welding condition changes the high frequency energy given to the welded object by changing the anode current flowing through the ammeter 8 by adjusting the capacitance of the tuning capacitor of the tuning circuit 6. In FIG. 13, the welding conditions IV (target welding current I1), V (target welding current I2), and VI (target welding current I3) are set by changing the target welding current with the welding time as Tw. As a result, when the thickness of the welded object is thin, the target welding current is reduced under welding condition IV (I1 in FIG. 13) to prevent excessive welding, and when the thickness of the welded object is thick, the target welding current is set under welding condition VI. It can be increased (I3 in FIG. 13) to prevent insufficient welding.

As described above, also in the modified example of the third embodiment of the present invention, the minimum value of the welded object within the dimensional tolerance is before the welded object within a certain dimensional tolerance in terms of size, shape, etc. is welded. High-frequency welding method and high-frequency welding that can distinguish between the optimum welding conditions for the combination of It solves the second problem of the present invention which provides the apparatus.

When a large amount of welded material within a certain tolerance is welded under the same welding conditions, the same level of work can be performed without measuring the rise time until the rise time reaches the preset measurement reference current value each time. If it can be determined that this is the case, change from the middle of the welding work to obtain the optimum welding conditions when, for example, 70% of the measurement reference current value is reached, and add a control function to shorten the work time. Is also good.

Further, in the third embodiment, the case where the rise time is used as the rise information has been described as an example, but the rise current value may be used as the rise information.

In this case, as the rising current value of the model welded object to be stored, the model welded object which is a combination of the minimum value of the dimensional tolerance of the sheet and the model welded object which is a combination of the maximum value of the dimensional tolerance are used. High-frequency energy is applied to the two model welded objects to measure the rising current value after a predetermined time that the two model welded objects are not welded. Memorize the correspondence with the appropriate welding conditions according to the model welded object.

Then, high-frequency energy is applied to the object to be welded to obtain the rising current value until it reaches a predetermined current value, and when the acquired rising current value is within the stored current value range, welding is performed. Appropriate welding conditions will be welded according to the target object to be welded.

Similarly, as the rising information, information such as the ratio of the rising current value, the rate of increase (R), and the rising angle (θ) of the rising current value can be used.

(Fourth Embodiment of the present invention)
The welding control method according to the fourth embodiment of the present invention will be described. In the welding control method according to the fourth embodiment, when one of the synthetic resin sheets is forgotten to be stacked, or when a synthetic resin sheet having a thickness exceeding the tolerance is mistakenly stacked, the synthetic resin sheet is made of synthetic resin. When the thickness of the sheet is abnormal, when the rise time is abnormally short, or when the rise time is abnormally long, it is detected and displayed and warned. Others are the same as in the third embodiment.

FIG. 14 illustrates the types of thickness of the welded object used in the welding control method according to the fourth embodiment of the present invention. In FIG. 14, not only Da, Db, and Dc in which the thickness of the sheet constituting the welded object shown in FIG. 7 is within the tolerance range, but also De, which is out of the tolerance by forgetting to overlap one of the sheets, and the thickness. A case will be described in which a Df that includes a sheet that is too thick and is out of tolerance is sandwiched between the upper mold 2 and the lower mold 3 to actually perform the welding work.

Fig. 15 (a) shows the rise time until the measurement reference current value is reached by sandwiching the welded material with thicknesses De and Df, which is outside the tolerance, between the upper mold 2 and the lower mold 3. As shown, the rise time of the thickness De for the welded object is smaller than the rise time ta with respect to the lower limit of the thickness within the tolerance. Further, the rise time of the thickness Df with respect to the welded object is tf larger than the rise time ct with respect to the upper limit of the thickness within the tolerance. FIG. 15B shows the relationship between the thicknesses Da, Db, and Dc within the tolerance and the rise time when the De and Df outside the tolerance are placed on the lower mold 3.

As described in FIGS. 15 (a) and 15 (b), when the thickness of the welded object sandwiched between the upper mold 2 and the lower mold 3 is outside the tolerance of the welded object as described above. , When the thickness of the welded object is smaller than the lower limit Da of the thickness within the tolerance and when it is larger than the upper limit Dc of the thickness within the tolerance, before the welded object is welded (before the sheets start to join). In addition, it can be determined that it should not be welded.

The welding control method according to the fourth embodiment will be described with reference to the flowchart of FIG. In FIG. 16, since the start steps S21 to ST31 are the same as the flowchart of the third embodiment shown in FIG. 11, the same step numbers are shown and the description of those steps is omitted.

In the fourth embodiment, when the rising time of the welded object is shorter than ta (YES in ST41), the oscillation of the oscillation circuit 7 is stopped because the rising time is too short, and the welding does not occur and rises to the display unit 12. It is displayed that the time is abnormally short (ST42), and the welding work is completed (ST45). On the other hand, when the rise time of the object to be welded is longer than tc (YES in ST43), the oscillation of the oscillation circuit 7 is stopped because the rise time is too long, and the rise time is abnormally long on the display unit 12 without welding. Is displayed (ST44), and the welding work is completed (ST45).

As a result, for example, when a thin welded object outside the tolerance range is mixed, a time when the rising time is abnormally short is detected before the welded object is welded, and the welding is not performed, and the welding is not performed. Since the message is displayed, it can be seen that the thickness is thinner than the specified value, which is an abnormality. As a result, the operator can quickly identify the cause of the abnormality and deal with the trouble before the welded object is welded.

In addition, even if one of the synthetic resin sheets is placed in a state where it is forgotten to be stacked, it is detected when the rise time is abnormally short before the welded object is welded, and it is displayed without welding. Since a message to that effect is displayed on the portion 12, it can be seen that the abnormality is due to the thickness being thinner than the specified value. The operator can quickly identify the cause of the abnormality and deal with the trouble before the welded object is welded.

On the other hand, when a thick welded object outside the tolerance range is mixed, a time when the rising time is abnormally long is detected before the welded object is welded, and the display unit 12 indicates that fact without welding. Since it is displayed, it can be seen that it is an abnormality because the thickness is thicker than specified. As a result, the operator can quickly identify the cause of the abnormality and deal with the trouble before the welded object is welded.

Further, for example, even when three or more welded objects are placed on top of each other instead of the specified two, welding is performed by detecting an abnormally long rise time before the welded objects are welded. Instead, a message to that effect is displayed on the display unit 12, so that it can be seen that the abnormality is due to the thickness being thicker than the specified value. The worker can quickly identify the cause of the abnormality and deal with the trouble.

As described above, in the fourth embodiment, when the welding operation is performed, the rise time until the anode current is passed and the measurement reference current value It is reached is detected, and the rise before the welded object is welded. When the time is abnormally short or abnormally long, the oscillation of the oscillation circuit 7 is stopped and displayed on the display unit 12 without welding, and the welding operation is stopped. The welded material has not been welded yet, and by resetting the welded material properly, troubles can be dealt with and production loss can be prevented.

Further, in the fourth embodiment, the case where the rise time is abnormally short and the rise time is abnormally long is displayed on the display unit 12 to notify the operator, but the method of notifying the operator is also by sound such as voice or alarm. Well, various methods can be adopted if the worker can be informed.

Further, even when the rise time is not abnormally short or abnormally long, but also when the rise time is in the rise time range corresponding to the outside of the tolerance range, the welding work is stopped without welding. The worker may be asked to confirm other contents.

In the fourth embodiment, the case where the rise time is used as the rise information has been described as an example, but the rise current value may be used as the rise information. In this case, if the acquired rising current value is not within the stored rising current value range, the welding operation is completed and the welding is stopped without welding the welded object.

Similarly, as the rising information, information such as the ratio of the rising current value, the rate of increase (R), and the rising angle (θ) of the rising current value can be used.

As described above, in the fourth embodiment of the present invention, in addition to troubles such as forgetting to attach the welded object to the mold and dropping the welded object from the mold, it is out of the tolerance that should not be the target of welding. If a thick welded object is mixed in or placed in a state where more than the specified number of welded objects are overlapped, an abnormality is quickly detected before welding is performed, and the incorrectly placed welded object is welded. The third problem of the present invention is solved, which provides a high-frequency welding method and a high-frequency welding apparatus capable of preventing the trouble of production loss of being discarded as a defective product.

Further, in the fourth embodiment, even when the size and shape of the welded object are changed, when the size and shape of the welded object are within the tolerance range allowed for the welded object, sometimes. It is possible to provide a high-frequency welding method and a high-frequency welding apparatus that perform welding under the optimum welding conditions of the above and stop the welding operation without welding when the tolerance range is out of the allowable range for the object to be welded. Then, it is possible to solve the fourth problem of the present invention, which provides a high-frequency welding method and a high-frequency welding apparatus for producing only non-defective products within the tolerance range allowed as a welded object. The first to fourth embodiments of the present invention have been described above.

It should be noted that the present inventor has described oscillation as a modified example of the procedure for measuring and storing the rise time as a preliminary preparation described in more detail in the flowcharts of FIG. 3 in the first embodiment and FIG. 8 in the third embodiment. He invented that the anode current immediately after is measured and the measurement reference current value is changed accordingly. When the anode current immediately after oscillation is measured and the measurement reference current value is changed accordingly, the rise time range is sufficient even if the thickness changes significantly in the thicker direction and the slope of the rise of the anode current becomes gentle. It is possible to measure the rise time accurately. The details will be described below.

In FIG. 17, for example, the thickness Dh of the welded object is significantly changed to about twice that of Db with respect to the model welded object (thickness Da, Db, Dc) described in FIG. 7 as an example. For Dg, Dh, Di), the waveform of the anode current when the rise time was measured was shown. In FIG. 17, the welding time (S) is taken on the X-axis and the anode current (A) is taken on the Y-axis.

As shown in FIG. 17, the anodic current of the model welded material having the thicknesses Dg, Dh, and Di has a gentler slope as compared with the case of the thicknesses Da, Db, and Dc. Here, if the measurement reference current value remains It1, the rise time tg of the thinnest (thickness Dg) model welded object and the thickest (thickness Di) model welded object due to the gentle slope. The difference in the rise time ti of the object becomes small, and the range of the rise time becomes narrow from tg to ti.

On the other hand, during the welding operation, the welding conditions are selected based on the range of the rise time stored in the storage unit 11, so it is necessary to set a wide range of the rise time.

Therefore, the anode current at the time tk (initial rise time) immediately after oscillation changes due to the large change in the thickness of the welded object (the anode currents Ik2 of the thicknesses Dg, Dh, and Di are the thicknesses Da and Db. , Dc becomes smaller than the anode current Ik1), and the measurement reference current value is changed to It2, which is larger than It1, according to the anode current at the initial rise time.

As a result, even if the slope of the increase in the anode current becomes gentle when a thick welded object is welded, a wide range of rise time (tg'to ti' in FIG. 17) can be secured. Since the welded object is thick, the magnitude of the measurement reference current value Ik2 can be increased to a current value at which the welded object is not welded according to the thickness.

In FIG. 17, the case where the center value of the tolerance changes significantly in the thick direction has been described, but it is effective even when the center value of the tolerance changes significantly in the direction of thinness. In this case, by reducing the measurement reference current value according to the thickness of the thinned sheet, the rise time can be measured with a small anode current at which the welded object is not welded.

FIG. 18 shows a flowchart for measuring the rise time. The procedure from the start of measurement of the rise time (ST11) to the start of oscillation and the flow of the anode current (ST14) is the same as that of FIG. 8 described above, and therefore the same numbers are assigned.

Then, the anode current Ik at the time tk immediately after the start of oscillation is measured (ST51). If the measured anode current Ik is less than half of the Ik1 stored in the storage unit 11 (YES in ST52), the measurement reference current value is changed to It2 larger than It1 and set (ST53). On the other hand, if the measured anode current Ik exceeds twice Ik1 (YES in ST54), the measurement reference current value is changed to It3, which is smaller than It1, and set (ST55). If it is less than twice or more than half of Ik1 (ST52 and ST54 are NO), the measurement reference current value remains It1 (ST56). Then, the rise time is measured with the set measurement reference current value, stored in the storage unit 11 together with the measurement reference current value (ST57), and the measurement of the rise time is completed (ST58).

By performing this work on model welded objects having other thicknesses Dh and Di, the rise times tg, th, and ti corresponding to the three types of thickness can be obtained. After that, as in the second embodiment, if the thickness of the model welded object and the rise time have a substantially linear relationship, the range of the rise time is set so that the time from tg to ti is divided into three equal parts.

As explained above, by measuring the anodic current immediately after oscillation and changing the measurement reference current value accordingly, even if the thickness changes significantly in the thicker direction and the slope of the anodic current rise becomes gentle. , The rise time can be measured accurately by securing a sufficient range of the rise time.

In addition, even if the thickness changes significantly in the thinner direction, by reducing the measurement reference current value according to the thickness of the thinner sheet, the rise time can be increased with a small anode current that does not weld the object to be welded. Can be measured.

The present invention relates to (1) when there is a change in the dimensions and shape of the welded object, and (2) when the dimensions and shape of the welded object fall within the tolerance range allowed for the welded object. It can be applied to a high-frequency welding method that performs welding under optimal welding conditions and a high-frequency welding device that uses it.

Further, the present invention can be applied to (3) a high-frequency welding method and a high-frequency welding apparatus in which welding is not performed when the tolerance range is out of the range required for the object to be welded.

And, the above (1) (2) (3), in particular by applying (2) and (3) at the same time, high-frequency welding method for producing only good falling within the tolerance range required as the weld deposit and It can be applied as a high frequency welding device.

1 High-frequency welding device 2 Upper mold 3 Lower mold 4 Welded object 5 Pressing unit 6 Tuning circuit 7 Oscillation circuit 8 Ammeter 9 High-voltage power supply 10 Control unit 11 Storage unit 12 Display unit

Claims (26)

It is a high-frequency welding method in which the object to be welded is welded by high-frequency energy.
Before welding work
(1) in advance, which is an object to be welded of a model case for keeping out the welding condition model from giving high-frequency energy at a predetermined welding condition for the object to be welded of the predetermined said model object weld deposit is not welded Measure the rising information of the anode current until it reaches the measurement reference current value , which is the anode current value.
(2) Based on the measured rise information of the anode current, a rise information range having a predetermined width with respect to the rise information is determined.
(3) The rising information range and the welding conditions according to the model welded object are stored in association with each other.
During welding work
(4) Obtaining information on the rise of the anode current in the welded object from the time when high-frequency energy is applied to the welded object to be welded until the measurement reference current value is reached, is obtained.
(5) The rising information of the welded object acquired during the welding operation is collated with the stored rising information range of the model welded object, and the rising information range to which the rising information of the welded object belongs corresponds to. Select the welding conditions and
(6) Welding the object to be welded according to the selected welding conditions .
A high-frequency welding method characterized by this.
It is a high-frequency welding method in which the object to be welded is welded by high-frequency energy.
Before welding work
(1) in advance, which is an object to be welded of a model case for keeping out the welding condition model from giving high-frequency energy at a predetermined welding condition for the object to be welded of the predetermined said model object weld deposit is not welded Measure the rising time of the anode current until it reaches the measurement reference current value , which is the anode current value.
(2) Based on the measured rise time of the anode current, a rise time range having a predetermined width with respect to the rise time is determined.
(3) The rise time range and the welding conditions according to the model welded object are stored in association with each other.
During welding work
(4) Obtain the rising time of the anode current in the welded object from the time when high frequency energy is applied to the welded object to be welded until the measurement reference current value is reached.
(5) The rise time of the welded object acquired during the welding operation was collated with the memorized rising time range of the model welded object, and the rising time range to which the rising time of the welded object belongs was corresponded to. Select the welding conditions and
(6) Welding the object to be welded according to the selected welding conditions .
A high-frequency welding method characterized by this.
It is a high-frequency welding method in which the object to be welded is welded by high-frequency energy.
Before welding work
(1) in advance, which is an object to be welded of a model case for keeping out the welding condition model from giving high-frequency energy at a predetermined welding condition for the object to be welded of the predetermined said model object weld deposit is not welded Measure the rising current value of the anode current until it reaches the measurement reference current value , which is the anode current value.
(2) Based on the measured rising current value of the anode current, a rising current value range having a predetermined width with respect to the rising current value is determined.
(3) The rising current value range and the welding conditions according to the model welded object are stored in association with each other.
During welding work
(4) from giving high-frequency energy to be welded of the welding object, it obtains the rise current value of the anode current in the object to be weld deposit until reaching the measurement reference current value,
(5) The rising current value of the welded object acquired during the welding operation is collated with the stored rising current value range of the model welded object, and the rising current value to which the rising current value of the welded object belongs belongs. Select the welding conditions corresponding to the range and
(6) Welding the object to be welded according to the selected welding conditions .
A high-frequency welding method characterized by this.
It is a high-frequency welding method in which the object to be welded is welded by high-frequency energy.
Before welding work
(1) Predetermined welding conditions for the first model welded object, which is a combination of the minimum dimensional tolerances of the welded objects, and the second model welded object, which is a combination of the maximum dimensional tolerances. in the given frequency energy, said first and rising prices for the second of the first and second anode current to model the weld deposit reaches the measurement reference current value is a predetermined positive current value which is not welded Measure and
(2) Based on the measured rise information of the first and second anode currents, the rise information range having a predetermined width with respect to the rise information is determined.
(3) The rising information range and the welding conditions according to the first and second model welded objects are stored in association with each other .
During welding work
(4) Obtaining information on the rise of the anode current in the welded object from the time when high-frequency energy is applied to the welded object to be welded until the measurement reference current value is reached, is obtained.
(5) the collated rising prices for welding operation be welded product obtained, on the the rising information range of the stored model object weld deposits are, corresponding to the rising information range belongs rising information of the object to be weld deposit Select the welding conditions and
(6) Welding the object to be welded according to the selected welding conditions .
High-frequency welding method characterized in that.
It is a high-frequency welding method in which the object to be welded is welded by high-frequency energy.
Before welding work
(1) Predetermined welding conditions for the first model welded object, which is a combination of the minimum dimensional tolerances of the welded objects, and the second model welded object, which is a combination of the maximum dimensional tolerances. from giving high-frequency energy in the first and the rising time of the second anode current to the first and second model object weld deposit reaches the measurement reference current value is a predetermined positive current value which is not welded Measure and
(2) Based on the measured rise time of the first and second anode currents, a rise time range having a predetermined width with respect to the rise time is determined.
(3) The rise time range and the welding conditions according to the first and second model welded objects are stored in association with each other .
During welding work
(4) Obtain the rising time of the anode current in the welded object from the time when high frequency energy is applied to the welded object to be welded until the measurement reference current value is reached.
(5) The collates the rise time range of welding model be welded object that is the stored the rise time of the weld deposit obtained during work, corresponding to the rise time ranges that belong rise time of the object to be weld deposit Select the welding conditions and
(6) Welding the object to be welded according to the selected welding conditions .
High-frequency welding method characterized in that.
It is a high-frequency welding method in which the object to be welded is welded by high-frequency energy.
Before welding work
(1) Predetermined welding conditions for the first model welded object, which is a combination of the minimum dimensional tolerances of the welded objects, and the second model welded object, which is a combination of the maximum dimensional tolerances. in the given radio frequency energy, said first and rising current value of the second model first and second anode current to the weld deposit reaches the measurement reference current value is a predetermined positive current value which is not welded Measure and
(2) Based on the measured rising current values of the first and second anode currents, a rising current value range having a predetermined width with respect to the rising current value is determined.
(3) The rising current value range and the welding conditions according to the first and second model welded objects are stored in association with each other .
During welding work
(4) Obtain the rising current value of the anode current in the welded object from the time when high frequency energy is applied to the welded object to be welded until the measurement reference current value is reached.
(5) the verification and rising current value range of the welding model be welded product rising current value are the stored of the weld deposit obtained during the work and, wherein the rising current value belongs rising current value of the weld deposit Select the welding conditions corresponding to the range and
(6) Welding the object to be welded according to the selected welding conditions .
High-frequency welding method characterized in that.
(5) the above storage and rising prices for welding operation at the welding material obtained in collating the rising information range of the model to be weld deposit are rising information of the weld deposit which is the acquired are the stored model The high-frequency welding method according to claim 1 or 4, wherein the welding operation is completed without welding the welded object when it is not within the rise information range of the welded object.
(5) the aforementioned rise time and the storage of welding the weld deposit obtained when working against a rising time range model the weld deposit are, the rise time of the weld deposit which is the acquired are the stored model The high-frequency welding method according to claim 2 or 5, wherein the welding operation is completed without welding the welded object when it is not within the rise time range of the welded object.
(5) The rising current value of the welded object acquired during the welding operation is collated with the stored rising current value range of the model welded object, and the acquired rising current value of the welded object is stored. The high-frequency welding method according to claim 3 or 6, wherein when the model welded object is not within the rising current value range, the welding operation is completed without welding the welded object.
Given to the welding conditions, a high frequency welding method according to any one of claims 1 to 9, characterized in that it includes the welding time for the model to be weld deposit.
The predetermined the welding conditions for the model to be welded comprises a high frequency welding method according to any one of claims 1 to 9, characterized in that it contains the target welding current.
The measurement reference current value, which is a predetermined anode current value at which the welded object is not welded, is characterized by being changed according to the magnitude of the anode current value after a specified time after applying high frequency energy to the welded object. The high-frequency welding method according to any one of claims 1 to 11.
Two molds arranged with a predetermined interval so as to sandwich the welded object,
A pressing portion that is sandwiched between the two dies and presses the welded object, and
A high-frequency energy supply unit that supplies a high-frequency current to the welded object by sandwiching it between the two molds,
A rising information measuring means for measuring rising information of the anode current from applying high frequency energy to the welded object to reaching the measurement reference current value which is a predetermined anode current value at which the welded object is not welded.
As a basis of the rising information anodic current in the measurement, determines the rise information range which gave a predetermined width with respect to the rising information, and the rising information range determining means,
Memory and
A high-frequency welding device equipped with a control unit.
The storage unit is stored before the welding operation.
(1) The measurement reference current is applied to a model welded object, which is a model case to be welded as a model case for setting welding conditions in advance, by applying high-frequency energy to the model welded object under predetermined welding conditions by the high-frequency energy supply unit. The rising information of the anode current until the value is reached is measured by the rising information measuring means, and the rising information is measured.
(2) The rising information range determining means determines a rising information range having a predetermined width with respect to the rising information based on the measured rising information of the anode current.
(3) before Symbol elevational rising information range, and the welding condition corresponding to the model to be weld deposits, stores in association with each other,
When the control unit welds the welded object,
(4) Obtaining the rising information of the anode current in the welded object from the rising information measuring means,
(5) The acquired rise information is collated with the stored rise information range of the model welded object, and welding conditions corresponding to the rise information range to which the rise information of the welded object belongs are selected.
(6) Welding the object to be welded according to the selected welding conditions.
A high-frequency welding device characterized by this.
Two molds arranged with a predetermined interval so as to sandwich the welded object,
A pressing portion that is sandwiched between the two dies and presses the welded object, and
A high-frequency energy supply unit that supplies a high-frequency current to the welded object by sandwiching it between the two molds,
A rising time measuring means for measuring the rising time of the anodic current from applying high frequency energy to the welded object to reaching the measurement reference current value which is a predetermined anode current value at which the welded object is not welded.
As the basis of the rise time of the anodic current in the measurement, it determines the rise time range which gave a predetermined width with respect to the rise time, and rise time range determining means,
Memory and
A high-frequency welding device equipped with a control unit.
The storage unit is stored before the welding operation.
(1) The measurement reference current is applied to a model welded object, which is a model case to be welded as a model case for setting welding conditions in advance, by applying high-frequency energy to the model welded object under predetermined welding conditions by the high-frequency energy supply unit. The rise time of the anode current until reaching the value is measured by the rise time measuring means, and the rise time is measured.
(2) The rise time range determining means determines a rise time range having a predetermined width with respect to the rise time based on the measured rise time of the anode current.
(3) before Symbol elevational rising time range, and the welding condition corresponding to the model to be weld deposits, stores in association with each other,
When the control unit welds the welded object,
(4) Obtaining the rising time of the anode current in the welded object from the rising time measuring means,
(5) The acquired rise time is compared with the stored rise time range of the model welded object, and a welding condition corresponding to the rise time range to which the rise time of the welded object belongs is selected.
(6) Welding the object to be welded according to the selected welding conditions .
A high-frequency welding device characterized by this.
Two molds arranged with a predetermined interval so as to sandwich the welded object from both sides,
A pressing portion that is sandwiched between the two dies and presses the welded object, and
A high-frequency energy supply unit that supplies high-frequency energy to the welded object by sandwiching it between the two molds,
A rising current value measuring means for measuring the rising current value of the anode current from when high frequency energy is applied to the welded object until the measurement reference current value , which is a predetermined anode current value at which the welded object is not welded, is reached.
As a basis of the rising current of the anode current in the measurement, determining the rising current value range which gave a predetermined width with respect to the rising current, the rise current value range determining means,
Memory and
A high-frequency welding device equipped with a control unit.
The storage unit is stored before the welding operation.
(1) The measurement reference current is applied after high-frequency energy is applied to a model welded object, which is a model case to be welded in advance, by the high-frequency energy supply unit under predetermined welding conditions. The rising current value of the anode current until reaching the value is measured by the rising current value measuring means, and the rising current value is measured.
(2) The rising current value range determining means determines a rising current value range having a predetermined width with respect to the rising current value based on the measured rising current value of the anode current.
(3) before Symbol elevational rising current value range, are stored in association with, and the welding condition corresponding to the model to be weld deposit,
When the control unit welds the welded object,
(4) Obtaining the rising current value of the anode current in the welded object from the rising current value measuring means,
(5) Welding conditions corresponding to the rising current value range to which the rising current value of the welded object belongs by collating the acquired rising current value with the stored rising current value range of the model welded object. Select and
(6) Welding the object to be welded according to the selected welding conditions .
A high-frequency welding device characterized by this.
Two molds arranged with a predetermined interval so as to sandwich the welded object,
A pressing portion that is sandwiched between the two dies and presses the welded object, and
A high-frequency energy supply unit that supplies a high-frequency current to the welded object by sandwiching it between the two molds,
A rising information measuring means for measuring rising information of the anode current from applying high frequency energy to the welded object to reaching the measurement reference current value which is a predetermined anode current value at which the welded object is not welded.
As a basis of the rising information anodic current in the measurement, determines the rise information range which gave a predetermined width with respect to the rising information, and the rising information range determining means,
Memory and
A high-frequency welding device equipped with a control unit.
The storage unit is stored before the welding operation.
(1) The first model welded object, which is a combination of the minimum dimensional tolerances of the welded object, and the second model welded object, which is a combination of the maximum dimensional tolerances, are provided by the high frequency energy supply unit. The rising information measuring means for the rising information of the first and second anode currents from when high frequency energy is applied under predetermined welding conditions until the first and second model welded objects reach the measurement reference current value. Measured by
(2) The rising information range determining means determines a rising information range having a predetermined width with respect to the rising information based on the measured rising information of the first and second anode currents.
(3) The rising information range and the welding conditions according to the first and second model welded objects are stored in association with each other .
When the control unit welds the welded object,
(4) Obtaining the rising information of the anode current in the welded object from the rising information measuring means,
(5) The acquired rise information is collated with the stored rise information range of the model welded object, and welding conditions corresponding to the rise information range to which the rise information of the welded object belongs are selected.
(6) A high-frequency welding apparatus characterized in that an object to be welded is welded under the selected welding conditions.
Two molds arranged with a predetermined interval so as to sandwich the welded object,
A pressing portion that is sandwiched between the two dies and presses the welded object, and
A high-frequency energy supply unit that supplies a high-frequency current to the welded object by sandwiching it between the two molds,
A rising time measuring means for measuring the rising time of the anodic current from applying high frequency energy to the welded object to reaching the measurement reference current value which is a predetermined anode current value at which the welded object is not welded.
As the basis of the rise time of the anodic current in the measurement, it determines the rise time range which gave a predetermined width with respect to the rise time, and rise time range determining means,
Memory and
A high-frequency welding device equipped with a control unit.
The storage unit is stored before the welding operation.
(1) The first model welded object, which is a combination of the minimum dimensional tolerances of the welded object, and the second model welded object, which is a combination of the maximum dimensional tolerances, are provided by the high frequency energy supply unit. The rise time measuring means measures the rise time of the first and second anode currents from when high frequency energy is applied under predetermined welding conditions until the first and second model welded objects reach the measurement reference current value. Measured by
(2) The rise time range determining means determines a rise time range having a predetermined width with respect to the rise time based on the measured rise times of the first and second anode currents.
(3) The rise time range and the welding conditions according to the first and second model welded objects are stored in association with each other .
When the control unit welds the welded object,
(4) Obtaining the rising time of the anode current in the welded object from the rising time measuring means,
(5) The acquired rise time is compared with the stored rise time range of the model welded object, and a welding condition corresponding to the rise time range to which the rise time of the welded object belongs is selected.
(6) A high-frequency welding apparatus characterized in that an object to be welded is welded under the selected welding conditions.
Two molds arranged with a predetermined interval so as to sandwich the welded object,
A pressing portion that is sandwiched between the two dies and presses the welded object, and
A high-frequency energy supply unit that supplies a high-frequency current to the welded object by sandwiching it between the two molds,
A rising current value measuring means for measuring the rising current value of the anode current from when high frequency energy is applied to the welded object until the measurement reference current value , which is a predetermined anode current value at which the welded object is not welded, is reached.
As a basis of the rising current of the anode current in the measurement, determining the rising current value range which gave a predetermined width with respect to the rising current, the rise current value range determining means,
Memory and
A high-frequency welding device equipped with a control unit.
The storage unit is stored before the welding operation.
(1) The first model welded object, which is a combination of the minimum dimensional tolerances of the welded object, and the second model welded object, which is a combination of the maximum dimensional tolerances, are provided by the high-frequency energy supply unit. The rising current value of the first and second anode currents from when high frequency energy is applied under predetermined welding conditions until the first and second model welded objects reach the measurement reference current value is the rising current value. Measured by measuring means,
(2) Based on the rising current values of the first and second anode currents measured by the rising current value range determining means, a rising current value range having a predetermined width with respect to the rising current value is set. Decide and
(3) The rising current value range and the welding conditions according to the first and second model welded objects are stored in association with each other .
When the control unit welds the welded object,
(4) Obtaining the rising current value of the anode current in the welded object from the rising current value measuring means,
(5) Welding conditions corresponding to the rising current value range to which the rising current value of the welded object belongs by collating the acquired rising current value with the stored rising current value range of the model welded object. Select and
(6) A high-frequency welding apparatus characterized in that an object to be welded is welded under the selected welding conditions.
The control unit
(5) the above storage and rising prices for welding operation at the welding material obtained in collating the rising information range of the model to be weld deposit are rising information of the weld deposit which is the acquired are the stored model The high-frequency welding apparatus according to claim 13 or 16, wherein the welding operation is completed without welding the welded object when it is not within the rising information range of the welded object.
The control unit
(5) the aforementioned rise time and the storage of welding the weld deposit obtained when working against a rising time range model the weld deposit are, the rise time of the weld deposit which is the acquired are the stored model The high-frequency welding apparatus according to claim 14 or 17, wherein the welding operation is completed without welding the welded object when it is not within the rise time range of the welded object.
The control unit
(5) The rising current value of the welded object acquired during the welding operation is collated with the stored rising current value range of the model welded object, and the acquired rising current value of the welded object is stored. The high-frequency welding apparatus according to claim 15 or 18, wherein when the model welded object is not within the rising current value range, the welding operation is completed without welding the welded object.
The predetermined welding condition for the model to be weld deposit, high frequency welding apparatus as claimed in any one of claims 21 claim 13, characterized in that it includes welding time.
The predetermined the welding conditions for the model to be weld deposit, high frequency welding apparatus as claimed in any one of claims 21 claim 13, characterized in that it contains the target welding current.
The measurement reference current value, which is a predetermined anode current value at which the welded object is not welded, is characterized by being changed according to the magnitude of the anode current value after a specified time after applying high frequency energy to the welded object. The high-frequency welding apparatus according to any one of claims 13 to 23.
As the rising information of the model to be weld deposit, using the ratio of the rising current value of the model to be weld deposit and the rise time of the model to be weld deposit, as the rising information range of the model to be weld deposits, of the model to be weld deposit using a range of the ratio of the rising current value of the rise time and the model be welded product the ratio of the rising current value as a base of the rise time and the model to be weld deposit,
The ratio of the rise time of the welded object and the rising current value of the welded object measured during the welding operation is collated with the range of the ratio of the rising time of the model welded object and the rising current value of the model welded object. The high-frequency welding method according to claim 1, wherein the welding conditions are selected.
In the storage unit
As the rising information of the model to be weld deposit, using the ratio of the rising current value of the model to be weld deposit and the rise time of the model to be weld deposit, as the rising information range of the model to be weld deposits, of the model to be weld deposit storing the range of the ratio of the rising current rise time and the model to be welded of the model to be welded product was based on the ratio of the rising current rise time and the model to be weld deposit,
The control unit
The ratio of the rise time of the welded object and the rising current value of the welded object measured during the welding operation is collated with the range of the ratio of the rising time of the model welded object and the rising current value of the model welded object. The high-frequency welding apparatus according to claim 13, wherein the welding conditions are selected.

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