JPH11245050A - Method and device for multi-spot welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent splitting of current and obtain a product with even and large welding strength by arranging materials to be welded on plural groups of lower electrode parts, electrically connecting each electrode plate to a power supply part sequentially and independently, and carrying out welding while upper electrode parts corresponding to the lower electrode parts come into contact with the materials to be welded sequentially. SOLUTION: A first hoisting cylinder 15 is driven, so that a contact conductor 14 is lowered and brought into connected with a first electrode plate 8a and a conductor plate 13. Further, a cylinder part 11 of an upper electrode part 6a corresponding to a lower electrode part 5a of the first electrode plate 8a is driven, so that an electrode 10 is lowered and brought into contact with a material 18a to be welded. When the first contact conductor 14 and the electrode 10 are rised and the second hoisting cylinder is driven, the contact conductor 14 is lowered and brought into contact with the second electrode plate and the conductor plate 13, so that the electrode 10 of the upper electrode part 6b is lowered and brought into contact with the material 18a to be welded. After the second welding, the contact conductor 14 is connected with the third electrode plate and the conductor plate 13, and the electrode 10 of the conductor part 6c is lowered and brought into connect with the material 18a to be welded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a multipoint welding method and an apparatus therefor.

[0002]

2. Description of the Related Art As shown in FIG.
, And a plurality of upper electrode portions b, the conventional multi-point welding apparatus is configured such that each lower electrode portion a is electrically connected to the power supply portion c via one (common) electrode plate d. The workpieces e are placed on the lower electrode parts a, and the electrode rods of the respective upper electrode parts b are sequentially lowered and brought into contact with the workpieces e for welding. At this time, an effective current shown by a virtual line f flows.

[0003]

However, in this conventional multi-point welding apparatus, at the time of welding, a current shunts along a workpiece e to generate a reactive current (shown by phantom lines g and g). There was a case. Therefore, current does not concentrate on the welding point of the workpiece e, and there is a problem or variation in the welding strength of the welded portion.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multi-point welding method and an apparatus therefor capable of preventing current shunt and performing reliable welding.

[0005]

In order to achieve the above-mentioned object, a multipoint welding method according to the present invention comprises a plurality of groups of lower electrode portions arranged on a plurality of electrode plates in a divided manner. The welded object is installed, and the respective electrode plates are sequentially electrically connected to the power supply unit independently, and the upper electrode portions corresponding to the lower electrode portions of the respective electrode plates are sequentially brought into contact with the welded object to perform welding. Is what you do.

A multi-point welding apparatus according to the present invention includes an electrode-type portion having a lower base plate and an upper base plate at least one of which is driven up and down so as to approach and separate from each other, and is provided on the lower base plate. A plurality of lower electrode portions and a plurality of upper electrode portions provided on the upper base plate, wherein the plurality of electrode plates are separated from each other and an insulator is provided. Along with attaching to the lower base plate via, the lower electrode portion is divided into a plurality of groups and arranged on the electrode plate, and further, each electrode plate is electrically connected to a power supply unit independently in turn, The upper electrode portion corresponding to the lower electrode portion of each electrode plate is sequentially brought into contact with the object to be welded and welded.

In addition, one conductor plate electrically connectable to the power supply unit is separated from each electrode plate and attached to the lower base plate via an insulator, and each electrode plate and the conductor plate are connected to each other. A plurality of contact conductors to be electrically and intermittently connected are attached to lower ends of a plurality of lifting cylinders attached to an upper base plate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows an embodiment of a multi-point welding apparatus according to the present invention. This multi-point welding apparatus comprises a lower base plate 1 and an upper base plate, at least one of which is driven up and down so as to approach and separate from each other. 2 is provided, and the electrode mold part 3 is detachably attached to the base frame 4.
In the illustrated example, the upper base plate 2 is driven to move up and down with respect to the lower base plate 1.

A plurality of lower electrodes 5 are provided on the lower base plate 1 of the electrode type part 3 and a plurality of upper electrodes (corresponding to the lower electrodes 5) are provided on the upper base plate 2. Are provided. Reference numeral 7 denotes a power supply unit, and a conductor path 2
The lower electrode portions 5 and the upper electrode portions 6 are electrically connected to each other via 0, 21 and the like.

As shown in FIGS. 2 and 3, a plurality of rectangular electrode plates 8 are provided on the upper surface 1a of the lower base plate 1 at a distance from each other and with an insulator 9 interposed therebetween. ing. In this case, three electrode plates 8 (8a, 8b, 8c) are attached to the lower base plate 1.

Thus, in the multipoint welding apparatus of the present invention, the lower electrode portions 5 are divided into a plurality of groups and arranged on each electrode plate 8. That is, in this case, the lower electrode portions 5 are divided into a first group to a third group, and are disposed one by one on the three electrode plates 8. In the present invention, one or a plurality of groups are defined.

The upper electrode section 6 includes an electrode rod 10 having a tip disposed near the electrode 19 of the lower electrode section 5, a cylinder section 11 for holding the electrode rod 10 so as to be able to move up and down, and an upper base plate 2. Lower surface 2a
And a cylinder supporting conductor portion 12 attached to the cylinder supporting conductor.

Further, the multi-point welding apparatus according to the present invention comprises a single conductor plate 13 electrically connectable to the power source unit 7 and each electrode plate 8
, And a plurality of contact conductors 14 that are attached to the lower base plate 1 via the insulator 9 and electrically and intermittently connect the electrode plates 8 and the conductor plate 13 to each other.
It is attached to the lower end of a plurality of lifting cylinders 15 attached to the upper base plate 2 in the left-right direction.

The lifting cylinders 15 are connected to the upper electrode portions 6.
The same drive source (the same fluid) as that of the cylinder units 11 is used. Each of the electrode plates 8 and the conductor plate 13 is provided with a plurality of pairs of contacts 16.
A plurality of pairs of contacts 17 corresponding to 16 are provided on the lower surface of each contact conductor 14.

Next, a multi-point welding method using the multi-point welding apparatus of the present invention will be described. As shown in FIGS. 2 and 3, first,
The plurality of groups (first group to third group) of the plurality of electrode plates 8 arranged in a divided manner on the lower electrode portions 5 are formed on the lower electrode portions 5.
(18a, 18b, 18c) are installed. And each electrode plate 8
Are sequentially electrically connected to the power source unit 7 independently, and the upper electrode portions 6 corresponding to the lower electrode portions 5 of the electrode plates 8 are sequentially brought into contact with the workpiece 18 (18a) for welding. .

That is, as shown in FIGS. 3 and 4, the first lifting / lowering cylinder 15a is driven, and the contact conductor 14 descends to come into contact with the first electrode plate 8a and the conductor plate 13, and the first The cylinder portion 11 of the upper electrode portion 6a corresponding to the lower electrode plate 5a of the electrode plate 8a is driven, and the electrode rod 10 descends to contact the workpiece 18a.

As a result, as shown by the imaginary line A, the first group of lower electrodes 5a and the corresponding upper electrodes 6a are energized, and the objects 18a and 18b are welded. At this time,
Since the electrode plates 8 are insulated from each other, the current does not travel to the lower electrode portions 5b and 5c of the other group through the workpiece 18a (no reactive current is generated). Can be concentrated on the welding point.

After the first welding {that is, after welding by the lower electrode portion 5a of the first group and the corresponding upper electrode portion 6a}, the first contact conductor 14 and the electrode rod 10 rise. . Then, as shown in FIGS. 3 and 5, the second lifting cylinder 15b is driven, and the contact conductor 14 is lowered to
The upper electrode portion 6b which is in contact with the second electrode plate 8b and the conductor plate 13 and which corresponds to the lower electrode plate 5b of the second electrode plate 8b.
The cylinder part 11 is driven, and the electrode rod 10 moves down to
Contact 18a. As a result, as shown by the imaginary line B, the second group of lower electrodes 5b and the corresponding upper electrode 6b are energized, and the objects to be welded 18a and 18c are welded.

After the second welding, the second contact conductor
14 and the electrode rod 10 rise, and as shown in FIG. 3 and FIG.
The third lifting / lowering cylinder 15c is driven, the contact conductor 14 descends to come into contact with the third electrode plate 8c and the conductor plate 13, and the upper electrode portion 6c corresponding to the lower electrode plate 5c of the third electrode plate 8c. Is driven, and the electrode rod 10 descends to come into contact with the workpiece 18a. As a result, the third group of lower electrode portions 5c and the corresponding upper electrode portion 6c are energized as shown by the imaginary line C, and the objects to be welded 18a and 18c are welded.

As described above, in the multi-point welding apparatus of the present invention, each of the electrode plates 8 is sequentially and individually connected to the power source unit 7 and the lower electrode unit 5 of each electrode plate 8. The upper electrode portions 6 are sequentially brought into contact with the body 18 to be welded, and a cylinder portion of each upper electrode portion 6 is formed so that current can be concentrated and welded at a welding point.
The elevating operation of the elevating cylinder 11 and the elevating cylinders 15 is controlled by a controller (not shown).

FIG. 7 shows another embodiment of the multi-point welding apparatus according to the present invention, which is a case of another electrode-type part, in which three plates provided on the lower base plate 1 are provided. Electrode plate 8 ...
Are provided with a plurality of lower electrode portions 5 on each of the first and second electrode plates 8a and 8b. That is, the first group is 2
, The second group is three, and the third group is one, and the lower electrode portions 5 are divided into a plurality of groups. Note that upper electrode portions 6 corresponding to the lower electrode portions 5 are attached to the upper base plate 2 (FIG. 2).
reference).

In this case, similarly to the above, each of the electrode plates 8 is electrically connected to the power supply unit 7 independently in turn, and the upper electrode portions 6 corresponding to the lower electrode portions 5 of the electrode plates 8 are also connected. Are sequentially brought into contact with the workpiece 18 to be welded. At this time, two spots are welded simultaneously in the first welding, three spots are simultaneously welded in the second welding, and one spot is welded in the third welding.

As described with reference to FIG. 1, the electrode mold portion 3 is detachable from the base frame 4, so that the
The electrode mold part 3 can be exchanged according to 18. In addition,
Pre-made (conventional) electrode-type parts can also be used.

[0025]

Since the present invention is configured as described above, the following effects can be obtained.

According to the first aspect, when the lower electrode portion 5 and the upper electrode portion 6 that are in contact with a predetermined portion of the workpiece 18 are welded,
The current does not flow along the to-be-welded body 18 and shunts to the other lower electrode portion 5, so that the current can be concentrated and welded at the welding point. That is, it is possible to reliably perform welding with a predetermined welding force, and to obtain a product having a uniform and high welding strength.

According to the second aspect of the present invention, it is possible to prevent a shunt during welding, and to replace the electrode mold part 3 integrally. Therefore, even if the workpiece 18 changes,
Can be dealt with.

According to the third aspect, the conductor plate 13 and the contact conductor 14 are integrally attached to the lower base plate 1 and the upper base 2, so that the work of replacing the electrode mold portion 3 can be easily performed. it can. The lifting cylinder 15 is provided on the upper base plate 2.
The same drive source (same fluid) as the cylinder unit 11 of the upper electrode unit 6 provided in the above can be used, and the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory diagram showing one embodiment of the present invention.

FIG. 2 is a main part side view showing the inside of an electrode mold part.

FIG. 3 is a plan view of a main part showing an upper surface side of a lower base plate.

FIG. 4 is an explanatory diagram showing a first welding state.

FIG. 5 is an explanatory diagram showing a second welding state.

FIG. 6 is an explanatory view showing a third welding state.

FIG. 7 is a plan view of a main part showing another embodiment.

FIG. 8 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower base plate 2 Upper base plate 3 Electrode part 5 Lower electrode part 6 Upper electrode part 7 Power supply part 8 Electrode plate 9 Insulator 13 Conductor plate 14 Contact conductor 15 Elevating cylinder 18 Workpiece

Claims (3)

[Claims] An object to be welded is placed on a plurality of groups of lower electrode portions arranged in a divided manner on a plurality of electrode plates, and each of the electrode plates is individually and sequentially powered by a power source. And electrically connecting the upper electrode portions 6 corresponding to the lower electrode portions 5 of the electrode plates 8 to the body 18 to be welded. Welding method. 2. An electrode type part 3 having a lower base plate 1 and an upper base plate 2 at least one of which is driven up and down so as to be able to approach and separate from each other, and a plurality of lower parts provided on the lower base plate 1 are provided. A multi-point welding apparatus comprising an electrode portion 5 and a plurality of upper electrode portions 6 provided on the upper base plate 2, wherein the plurality of electrode plates 8 are separated from each other and insulated. Body 9
, And the lower electrode portions 5 are divided into a plurality of groups and disposed on the electrode plates 8.
Further, each of the electrode plates 8 is electrically connected to the power source unit 7 independently in turn, and the upper electrode portions 6 corresponding to the lower electrode portions 5 of each electrode plate 8 are sequentially contacted with the workpiece 18. A multi-point welding apparatus characterized by being configured to perform welding. 3. A conductor plate 13 electrically connectable to the power supply unit 7 is separated from each of the electrode plates 8 and attached to the lower base plate 1 via an insulator 9, and each of the electrode plates 8 3. A plurality of contact conductors (14) for electrically and intermittently connecting the conductor plates (8) to the conductor plate (13) are provided at lower ends of a plurality of lifting cylinders (15) attached to the upper base plate (2). Multi-point welding equipment.