JPS5893567A - Multihead welding device - Google Patents

Abstract

PURPOSE:To obtain a multihead welding device which drives plural welding head with one welding electric power source by providing a welding positioning mechanism, plural welding head mechanisms, polishing mechanism of tips of head electrodes, and circuit which successively discriminate and control each part mechanism operation. CONSTITUTION:After a welding position is detected, the presence of parts is judged, and a discrimination on applied pressure to a welding head 2 is made to input a signal for the starting the conducting of electricity to a welding power source 3 according to coincidence conditions. At this time, an upper head 2 is conducted electricity and a lower head 2 is conducted electricity 0.1sec later to input the signal for the starting to the power source 3 again. For electricity conducting switching between the upper and lower heads 2, another signal is inputted from a discrimination control part 18 to a selector control circuit 20 successively. This circuit 20 is arranged between the secondary side of the power source 3 and the primary sides of welding transformers 23 and 24, and performs the electricity conducting switching without reference to a welding current. The control part 18 inputs position information on each mechanism and the welding position, and an information signal such as an applied pressure signal from the head 2 to control a motor driving circuit 21 and a solenoid valve driving circuit 22 according to the coincidence of conditions, performing prescribed operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-head welding device, and more particularly to a welding device that automatically performs predetermined bath welding by sequentially determining and controlling a welding position positioning mechanism, a multiple bath welding head structure, an electrode polishing mechanism, etc. It is related to the device.

Conventionally, fine leads have often been connected by manual soldering or manual welding. and,
Most of the welding work involves the operator's sensory skills in positioning, setting electrical connection conditions, etc., and requires a high level of skill.

Therefore, for welding a relatively regular pattern,
Equipment has also been developed, but these are bath welding machines that use simple transmitted light for welding positions, or bath welding machines that use one welding power source and one welding head to perform a single operation. It is a machine. Further, a bath welding machine equipped with a multi-head is also being considered, but in this case as well, a plurality of welding power source systems are arranged in a one-to-one correspondence. As is well known, when manufacturing welding equipment, installing a large number of welding power sources, which account for 1/3 of the cost, not only increases the manufacturing cost, but also requires adjustment of equipment,
Management effort increases.

Furthermore, it is conceivable to use an NC device as a method for positioning the bath contact, but this would be extremely expensive.

The purpose of the present invention is to solve these problems by making it possible to drive a plurality of bath contact heads with a single grounding power source, to automatically and accurately position a fine pattern without relying on visual inspection or NCK, and furthermore, to We provide an inexpensive multi-head welding device that can automatically pressurize the welding head and energize multiple heads in series. It's about doing.

In order to achieve the above object, the multi-head welding device of the present invention is a device for welding four connectors and components having a plurality of lead terminals to a solder-plated connection pattern in advance. The present invention is characterized by having a test liquid positioning mechanism that obtains a position signal by using the position signal of the position signal, a plurality of welding heads, a mechanism that polishes the tip of the head electrode, and a circuit that sequentially determines and controls the operation of each part of the mechanism.

Embodiments of the present invention will be described below with reference to one drawing.

FIG. 1 is a perspective view of a multi-head welding device showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the state of the welding part of the bath welding device of FIG. 1.

As shown in Fig. 1, the welding heads 2 are located above and below the printed board 1, and during welding, the upper head of the bath welding heads 2 moves downward, and the lower head moves upward. It has a structure in which the printed board 1 is sandwiched therebetween. The positional relationship between the bath contact head 2 and the printed board 1 is as shown in FIG.

The welding head 2 performs a vertical movement and a swinging movement of the head arm 2-6, of which the vertical movement is an operation for pressurizing the component lead at the welding position and applying welding current. The former, that is, the vertical movement, is driven by two air cylinders 8, and the latter, that is, the swinging movement of the head arm, is driven by a 90° rotary air actuator IIK.

When energizing the welding head 2, the distance between the two electrode tips 2-
1. By applying current between 2 and 2, heat is generated due to the contact resistance of the contact point between the electrode and the component lead, melting the solder prepared in advance, and also melting the contact point between the copper foil of the base material and the component lead. Welding current is applied to melt and form a nugget.

Generally, the -4-5-welding method is called the parallel gap welding method. What is the timing of power on?

``The upper welding head 2 is energized for approximately Q, 2 m@e, and then the lower welding head 2 is energized, and in FIG. 1, two welding heads 2 are energized by one welding power source 3. In addition, in Fig. 1, only one head arm 2-5 is provided, but by applying this, a plurality of bath welding head arms 2-5 can be prepared and one welding process can be performed. It is also possible to energize a plurality of welding heads with the power source 3.

As a result, a low-friction series bath wetting device can be realized.

The rotational pressure setting is such that when the upper and lower welding heads 2 are inserted, they stop at a position where the upper and lower pressures are balanced.

The final energization pressure is determined by a pressure switch built into the welding head 2 to start energization. However, a matching condition logic is incorporated so that energization is started only when the pressure switches of the upper and lower welding heads 2 are both in the "on" state.

As shown in FIG. 1, the printed circuit board 1 is mounted on a single-axis table, and in order to clamp it, a stopper 10 for coarse positioning and a clamp pin 9 for fine positioning are installed. It has a structure that clamps from both sides. The clamp pin 9 is composed of two pins, a long taper pin for coarse positioning and a small straight pin for fine positioning.

This l-axis staple is driven by a step motor 7, and in this case it is positioned in response to a position signal for the welding position, but slight deviations occur due to the inertial force of the staple. In order to correct this, a correction pulse (g) or (c) is added to the instruction pulse of the step motor 7 to ensure accurate positioning. ,
A reference pattern 13 with flatness is provided, and the optical detection device 12 positioned perpendicularly to this pattern detects black and white and recognizes one position, thereby determining the pattern of the printed board 1 that is the workpiece. We use a method of recognition using substitutions. The yin and yang of black and white is determined by the amount of reflected light, and this differs from visual perception of black and white, so care must be taken.

When welding continuously, the contact resistance fluctuates due to carbides, dust, etc. at the tip of the electrode, so polishing is required at the same time as a given welding process is completed. 1, the bath contact head 2 is swung to the polishing position 14 to perform polishing. The head 2, which has swung to the polishing position 14, completes the polishing by inserting sand vapor stuck on one side and operating the drive motors 15 and 16 for the X and Y axes of the polishing table.

FIG. 3 is a control system block diagram of a multi-head welding device showing an embodiment of the present invention, and FIG. 4 is an operation time chart in FIG. The position is detected, then the presence or absence of the part is determined, and the pressing force of the welding head 2 is determined, and when the peaks match, a signal to start energization is inputted to the welding power source 3VC. At this time, a start signal is again input to the welding power source 3 in order to energize the lower welding head 2 0.1 sec after the upper welding head 2 is energized. Also, this upper welding head 2
For switching the energization to the lower welding head 2, different signals are sequentially input from the determination control section 18 to the selector control circuit 20. This selector control circuit 20 is arranged between the secondary side of the welding power source 30 and the primary side of the welding transformer 23, 24, and is connected to the welding current. To perform energization switching without being affected.

Inside the selector control circuit 20, a non-contact photocoupler relay is used, but since this relay uses a trybook, it can withstand relatively large currents. It has a durable structure.

By effectively utilizing this non-contact relay.

A single power source makes full use of a plurality of welding heads 2, and welding can be performed in a short time.

Sequentially, the determination control unit 18 inputs information signals such as the position information of each mechanism, the welding/disconnecting position, and the pressure signal of the welding head 2 from the sensor 26, and if the conditions match, the motor drive circuit 21
．． Controlling the electromagnetic pulp drive circuit 22, the moving motor 7,
Necessary output signals are given to the polishing table motor 15, 16, bath contact power source 3, and selector control circuit 20, respectively, to perform predetermined operations.

To explain the operation sequence ~ in the first figure, Figure 4 (a)
The clamp pulp 9 shown in FIG. 4(b) and the stopper pulp 10 shown in FIG.
The moving motor 7 of FIG. 4(C) is driven by the welding position signal from the position detection sensor of d).

After stopping, drive the head up and down as shown in Fig. 4(f), operate the welding head, energize the welding power source as shown in Fig. 4(i) multiple times, and turn the head as shown in Fig. 4(g). - Drive the swing pulp and perform the polishing operation by swinging the welding head 2. Polishing is carried out by driving the polishing table motor shown in FIG. 4(j) when the initial number of leads and a plurality of parts have been welded.

As explained above, according to the present invention, since the welding power source is used effectively, only one welding power source is required, and all of the welding power sources can be used for the same purpose, thereby reducing the cost of the device. Become. Furthermore, since an optical detector is used as a welding positioning method, the device is inexpensive, easy to maintain and manage, and accurate positioning is possible. Furthermore, it determines the welding position signal and the position of the mechanism, and performs a series of welding steps such as welding energization, polishing the electrode tip, etc.

This can be done automatically in response to changes in conditions.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a multi-bed welding device showing an embodiment of the present invention, FIG. 2 is a partially enlarged view of a welding part in the device of FIG. 1, and FIG. 3 is a multi-head welding device showing an embodiment of the present invention. A four-dimensional diagram of the control system of the device. FIG. 4 is an operation time chart of FIG. 3. 1 niblint plate, 1-1 = solder plated pad, 2:
! I-contact head, 2-1 to 2-4: Electrode chip, 2-5:
Head/arm, 3: Welding power source, 4: Sequencer, 5:
Control power supply, 6: Operation panel. 7: Table drive motor, 8: Head pressure cylinder, 9
: Clamp, 10: Stopper, 11: Swing actuator, 12: Mark sensor. 13: Reference pattern, 14 = abrasive plate, 15.16: abrasive plate drive motor, 17: ° connector, 17-1 to 17-4
: each part of the connector, 18: sequential determination control section, 20: selector control circuit, 21: printer drive circuit, 22: electromagnetic pulp drive circuit, 23, 24: welding transformer, 25: sensor. Figure 1 Figure 2

Claims (1)

[Claims] (1) In an apparatus for welding connectors and components having a plurality of lead terminals to connection patterns plated with solder in advance, an optical sensor output signal and other position signals are used together. A welding positioning mechanism that obtains position signals, a plurality of welding head mechanisms, a mechanism that polishes the tip of the head electrode, pressurization of the welding head based on the contact position and number of welds, and series energization of multiple welding heads.1. A multi-head welding device characterized by having a circuit that sequentially determines and controls each operation of polishing the tip of a head electrode. (b) For the welding position, an optical sensor is installed vertically above the Yin-Yang film-like reference pattern, and the output signals of the optical sensor are sequentially input to a judgment control circuit to determine the position signal and condition signal of each mechanical part. 2. The multi-head welding apparatus according to claim 1, wherein the determination is made based on the coincidence of the following. (3) The first aspect of the present invention is characterized in that the series energization of the plurality of bath contact heads is performed under the control of a selector control circuit connected to one bath contact power source. The multi-head welding device described in ll.