Method for preheating pedal type spot welding machine

Abstract

The invention discloses a method for preheating a pedal type spot welding machine, which comprises the following steps of: timing the interval time of upper and lower welding through a time module, when the timed time exceeds the set time, keeping an alarm on, controlling a welding head to perform continuous missing welding by an operator at the moment, recording the missing welding times through a times module, and when the missing welding frequency reaches the set frequency, the alarm is eliminated, and normal welding can be carried out. By additionally arranging the time module, the frequency module and the alarm, an operator can judge whether missing welding preheating needs to be conducted on a welding head or not according to the state of the alarm, so that the tin explosion condition is avoided, and the spot welding machine solves the problem that welding products are abnormal due to equipment cooling in the idle period through frequency and time control.

Description

Technical Field

[0001] The invention relates to a method for ensuring welding quality, in particular to a method for preheating a pedal type spot welding machine. Background Art

[0002] In the process of producing electronic components, our company needs to use a pedal-type spot welder to weld the components in the electronic components. However, during the welding process, it was found that some products would have tin frying. After repeated research, we found that to avoid tin frying, it is necessary to ensure that the welding head always reaches a certain temperature during welding. However, the temperature of the welding head will drop after each welding. When the interval between the upper and lower welding is too long, the welding head cannot be heated to the required temperature under the action of the welding current during the next welding. In addition, the spot welder has no preheating function, which causes workers to have tin frying during normal welding. Therefore, when welding, how to judge whether the temperature of the welding head has reached a normal temperature has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] The purpose of the present invention is to provide a method for preheating a pedal-type spot welding machine. When the upper and lower welding times exceed the set time, an alarm signal is issued to prompt the worker to preheat the welding gun for dry welding, thereby avoiding tin explosion during the welding process.

[0004] The technical solution of the present invention is a method for preheating a pedal-type spot welding machine, in which the interval time between the upper and lower weldings is timed by a time module. When the timed time exceeds the set time, the alarm is always on. At this time, the operator controls the welding head to perform continuous empty welding, and records the number of empty welding times by a number module. When the number of empty welding times reaches the set number, the alarm is eliminated and normal welding can be performed.

[0005] In the aforementioned method for preheating a pedal-type spot welding machine, the time module and the number module are both PLC programs.

[0006] In the aforementioned method for preheating a pedal-type spot welding machine, during the idle welding process, the time module is used to time the interval between the upper and lower idle weldings. If the interval between the upper and lower idle weldings exceeds the set time, the number of times recorded by the time module is reset to zero, and the number of empty welding times is recorded again from the next empty welding.

[0007] Advantages of the present invention: Compared with the prior art, the present invention adopts the above technical solution. By adding a time module, a number module, and an alarm, the operator can judge whether the welding head needs to be preheated by dry welding according to the state of the alarm, thus avoiding the occurrence of solder explosion. Through the control of the number and time, the spot welder solves the problem of abnormal welding products caused by the cooling of the equipment during the idle period. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a flow chart of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] The following further illustrates the present invention in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present invention.

[0010] Embodiment of the present invention: Taking the spot welder currently used by our company as an example, under normal circumstances, the spot welder equipment passes the welding current after stepping on the foot pedal. The welding current will increase the temperature of the welding head, making it convenient for welding. However, this spot welder equipment cannot be preheated in advance, and during the operation of the spot welder, it is inevitable that there will be a situation of suspension in the middle. During the suspension in the middle, the temperature of the welding head will gradually decrease. When the spot welder has not been welded for more than 1 minute and the equipment is started, the temperature of the welding head cannot reach the required welding temperature, and when the welding head descends for welding, it will cause the product to have a solder explosion situation.

[0011] Based on this, we have developed a method to preheat the pedal type spot welder. The time module measures the time interval between two consecutive weldings. When the measured time exceeds 1 minute, the alarm light is always on for alarm, informing the operator that the current welding head is in a cooling state. At this time, the operator controls the welding head to perform dry welding continuously 10 times. Dry welding means that the welding head is energized and lowered, but the product is not welded. Since the welding head is energized, its temperature will rise, and the number module records the number of dry weldings. When the recorded number of dry weldings reaches 10 times, the temperature of the welding head has risen to the temperature that can be used for normal welding, and the alarm prompt of the alarm is eliminated, and then normal welding can be carried out. In this method, there is no need to set up a temperature monitoring device to monitor the temperature of the welding head in real time.

[0012] Both the time module and the number module are PLC programs, and the control of time and number is realized through corresponding programs, without the need to add hardware devices for recording time and number.

[0013] During the dry welding process, the time module also measures the time interval between two consecutive dry weldings. If the time interval between two consecutive dry weldings exceeds the set time, the number recorded by the number module is cleared, and the number of dry weldings is re-recorded starting from the next dry welding.

[0014] For example, if the set number of non-welding operations is 10 times, and the time interval between the 5th and 6th non-welding operations exceeds 1 minute, the number recorded by the number module changes from 5 times to 0 times. Then, 10 non-welding operations need to be performed again, and the number module re-counts.

[0015] In the present invention, by programming the PLC program and adding an alarm, the preheating alarm function is realized. When the spot welder has not performed welding for more than 1 minute and the equipment is started, the spot welder gives an alarm prompt to inform the operator that the current welding head is in a cooling state. The operator only needs to step on the foot pedal to perform 10 non-welding operations on the welding head, so that the temperature of the welding head can reach the preheating state, and the alarm can be eliminated to normally execute the welding action. Throughout the process, the spot welder controls through the number and time to solve the problem of abnormal product welding caused by equipment cooling during the idle period.

[0016] The method of the present invention is applicable to spot welders that cannot be preheated in advance, do not have a warning function, and cannot know the equipment shutdown cooling time.

Claims

1. A method for preheating a pedal-type spot welding machine, characterized in that: The time module is used to time the interval between the upper and lower welding times. When the timing time exceeds the set time, the alarm is always on. At this time, the operator controls the welding head to continuously perform empty welding, and records the number of empty welding times through the number module. When the number of empty welding times reaches the set number, the alarm disappears and normal welding can be carried out.

2. A method for preheating a pedal-type spot welding machine according to claim 1, characterized in that: The time module and the frequency module are both PLC programs.

3. A method for preheating a pedal-type spot welding machine according to claim 1, characterized in that: During the empty welding process, the time module is also used to time the interval between the upper and lower empty weldings. If the interval between the upper and lower empty weldings exceeds the set time, the number of times recorded by the number module will be reset to zero, and the number of empty weldings will be recorded again from the next empty welding.

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