JP3017279B2 - Welding machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a welding machine for welding a fastening member at a predetermined position on a material to be welded, as a member to be assembled such as an automobile part or a housing equipment. It is.

2. Description of the Related Art In order to easily and efficiently assemble parts to be mounted on automobile parts and housing equipment, for example, panels, etc., communication holes (positioning holes) formed with metal panels and the like are provided. )When,
A fastening member, for example, a nut (projection nut) is welded by matching the screw hole or a bolt (projection bolt) is connected to the communication hole and welded. Parts are assembled and fixed to the panel by screwing bolts or nuts to the bolts.

For fixing such a projection nut, for example, a projection nut welding machine disclosed in Japanese Utility Model Laid-Open No. 63-16581 or Japanese Utility Model Laid-Open No. 59-114284 is often used.

In the known welding machine 1, as shown in FIG. 10, holding portions 3a and 5a are provided on upper and lower support members 3 and 4 attached to the front surface 2a of the welding machine body 2, respectively. An upper movable electrode 4 and a lower fixed electrode 6 are provided on the holding portions 3a and 5a so as to face each other, and a positioning pin 7 is provided on the lower fixed electrode 6 so as to protrude.

With such a welding machine 1, a member to be welded (a panel or the like)
After fixing or supporting the member to be welded W such that the communication hole Wa of W fits into the positioning pin 7, the nut 8 is automatically supplied to the positioning pin 7 by the nut feeder 9 so that the screw holes match. . The cylinder 10 provided on the upper support member 3 allows the upper holding portion 3a
The upper electrode 4 is depressed through the wire and a welding current is applied to the upper and lower electrodes through the strip-shaped cables 11 and 12 while pressing the nut 8 against the W of the panel or the like, and welding is performed by resistance heat.

However, in the above welding machine, there is only one upper electrode and one lower electrode, and there is only one positioning pin and one nut feeder provided on the lower electrode. Even so, the number of nuts supplied by the nut feeder is limited to one type, and therefore two or more types of nuts having different diameters cannot be welded to the same member by one welding machine.

[Problems to be Solved by the Invention] For this reason, when welding two kinds of nuts having different diameters of, for example, 6 mm and 8 mm to one member to be welded, two welding machines are installed. After welding a 6 mm nut with the above welding machine, the member to be welded was moved to the second welding machine, set again, and the 8 mm nut had to be welded twice.

As a result, the equipment cost has almost doubled, the number of processes has increased, and the labor cost has increased, which has hindered cost reduction.

Under such circumstances, early development of an automatic welding machine capable of welding two or more types of nuts or bolts with one welding machine has been a problem.

An object of the present invention is to provide an easy-to-use welding machine capable of welding two or more types of fastening members with one welding machine in order to solve the above-mentioned problems.

[Means for Solving the Problems] The configuration of the welding machine according to the present invention is such that a fastening member is supplied on a member to be welded, and upper and lower electrodes attached to an electrode support member are brought into pressure contact with the member to be welded and the fastening member. In the welding machine, the plurality of lower electrodes are linearly installed via a rubber on a base mounted on a lower electrode support member according to the size and type of the fastening member, and the base is mounted on the base. And a plurality of electrodes that are linearly moved by a cylinder to switch the plurality of electrodes. A fastening member is supplied on the member to be welded, and the upper and lower electrodes attached to the electrode support member are connected to the member to be welded. In a welding machine in which a welding is performed by applying pressure contact to a fastening member, a support plate is supported via rubber on a base mounted on a lower electrode support member, and the size and type of the fastening member are supported on the support plate. Multiple lower electrodes selected accordingly Is installed by a rotating electrode head, the base is configured to be linearly movable by a first cylinder, and a rack and pinion is operated by a second cylinder having the electrode head mounted on the base. The second aspect of the present invention is configured to rotate by a mechanism and switch the plurality of electrodes.

[Operation] In the welding machine of the present invention having such a configuration, first, the base, which will be described later, is retracted, and the first lower electrode is positioned above the base end of the electrode, for example, the first base of the member to be welded. Is fixed to the first positioning pin protruding from the lower electrode, and a first fastening member, for example, a nut, is positioned from the first nut feeder described later by positioning the first positioning pin in the first communication. Concentric with the hole. Then, the upper movable electrode is depressed and pressed by a cylinder described later, a welding current is passed between the upper and lower electrodes, and the first nut is welded to the member to be welded by resistance heat.

When the welding of the first nut is completed by the above steps, the member to be welded is once lifted and removed from the first positioning pin.

Next, the air cylinder described later is operated to position the second lower electrode on the base end of the electrode, and set so that the second communication hole of the member to be welded fits into the second positioning pin described later.

Hereinafter, the second nut is supplied and welded by the second nut feeder described later in the same manner as described above.

[Embodiment] An embodiment of a welding machine for welding a 6 mm projection nut (hereinafter referred to as a nut) 16 and an 8 mm nut 17 to an automobile door hinge hinge door panel reinforcing member 15 shown in FIG. This will be described in detail with reference to FIGS.

 FIG. 1 is a schematic perspective view of a first embodiment of the present invention.

Reference numeral 21 denotes an entire welding machine, in which an upper electrode support member 23 and a lower electrode support member 24 are mounted on the front surface of a main body 22, and electrodes are provided so as to face respective tips. It is basically the same as the example.

Reference numeral 31 denotes an electrode switching device, which is a bed 25 mounted and fixed on the lower support member 24 as shown in FIGS.
The base 32 is slidably moved back and forth in the direction of an electrode base end (terminal) 35 by the rod 34 of the first air cylinder 33, and two electrode holding portions 36 and 37 are mounted on the base 32. It is provided linearly at a predetermined interval, and a first pin 6 mm with a 6 mm positioning pin 38 fixed to each of the holding portions 36 and 37.
2nd fixed lower electrode 38 and 8 mm positioning pin 39a
The lower electrodes 39 are provided via rubbers 46 for insulation and floating.

Note that the positioning pins 38a, 3
Nut feeders (not shown) for 6 mm and 8 mm toward 9a are provided.

Reference numeral 26 denotes an upper movable electrode, which is attached to the upper holder 23a so as to face the electrode base end 35, and one electrode is provided for both 6 mm and 8 mm.

When the base 32 and the piston rod 34 are retracted by the first air cylinder 33,
A first lower electrode 38 is located on the electrode base end 35;
When the base 32 advances, the second lower electrode 39 is set to be located on the electrode base end 35.

 The welding machine 1 having the above configuration operates as follows.

First, in a state where the base 32 is retracted and the first lower electrode 38 for 6 mm is located on the electrode base end 35, the communication hole 15 a for 6 mm of the member 15 to be welded as shown in FIG. The 6 mm nut feeder is fitted into and fixed to a 6 mm positioning pin 38 a protruding from the electrode 38, and a 6 mm nut 16 is supplied from the 6 mm nut feeder with the positioning pin 38 a positioned so as to be concentric with the communication hole 15 a. Then, the upper movable electrode 26 is pushed down by the cylinder 27, and the rubber 46 is compressed and pressurized. A welding current is passed between the upper and lower electrodes, and the nut 16 is welded to the workpiece W by resistance heat.

When the welding of the 6 mm nut is completed by the above process, the member to be welded 15 is once lifted, and the positioning pin 38 is lifted.
Remove from a.

Next, the first air cylinder 33 is operated, and the piston rod
The base 32 is advanced by 34, and a second
Is set so that the 8 mm communication hole 15b of the member to be welded 15 is fitted into the positioning pin 39a. Hereinafter, the 8 mm nut 17 is supplied and welded in the same manner as described above.

Next, a second embodiment will be described with reference to FIGS.

41 is an electrode actuating device, the first of which is shown in detail in FIG.
Similarly to the electrode switching device 31 in the embodiment, the side plate 32a is placed on the bed 25 attached and fixed on the lower support member 24.
A base 32 having a base 32 and an end plate 32b is slidably moved back and forth in the direction of an electrode base end 35 by a rod 34 of a first air cylinder 33, and the base 32 has an electrode holding section 42 and an electrode switching section 42a.
Is mounted.

The electrode holding portion 42 is provided with two support plates 48 having an L-shaped cross section in parallel at regular intervals so that the flange portions 48a thereof are directed outward, and the horizontal plates 48b are connected to each other by horizontal plates 48b. And the flange 48a is attached to the side plate 32a of the base 32.
In addition, an insulating and floating rubber 46 is interposed therebetween and fixed.

The electrode head portion 50 is rotatably supported by a shaft 51 between the distal ends of the two support plates 48, and one end of the shaft 51 extends through the vertical plate of one support plate 48. A pinion 49 is fixed to the end. A rack 45 attached to the tip of a rod 44 of a second air cylinder 43 mounted along the support plate 48 meshes with the pinion 49. Above pinion 49, rack 45, rod 44
The second air cylinder 43 forms an electrode switching unit 42a.

The electrode head portion 50 has a regular hexahedron, and two electrode mounting surfaces 50a and 50b adjacent to each other among the four surfaces in the rotation direction have a length of 6 m.
a first lower electrode 52 having a positioning pin 52a for m
A second lower electrode 53 having a positioning pin 53a is provided. The electrode head 50 is configured to be located on the electrode base end 35 when the first cylinder 33 is operated.

The electrode actuator 41 configured as described above operates as follows.

First, in the state of FIG. 7 in which the rods 34 and 44 of the first air cylinder 33 and the second air cylinder 43 are extended,
The other surface 50c without the electrode 50 is the same as that of FIG.
The first lower electrode 52 and the positioning pin 52a for 6 mm face the upper movable electrode 26 with a slight gap above the upper movable electrode 26.

In this state, similarly to the first embodiment, the 6 mm communication hole 15a of the member to be welded 15 shown in FIG.
When it is fitted to 52a and supported and fixed, a 6mm nut 16 is supplied from a 6ma floating nut feeder, after which the upper movable electrode 26 descends and pressurizes. This makes the rubber 46
When the first lower electrode 52 comes into contact with the base end 35 of the electrode and is energized, the nut 16 is welded to the member 15 to be welded.

After the 6 mm nut has been welded, the member to be welded 15 is once removed by the positioning pin 52, and then the first air cylinder 33 is actuated to pull back the base 32, and the second air cylinder 43 is slightly delayed. And pulling the rack 45 to move the head unit 50 through the pinion 49.
Is turned to the left so that the second lower electrode 53 for 8 mm and the positioning pin 53a face upward as shown in FIG.
And confront it. Thereafter, the first air cylinder 33 is operated to push out the base 32, and the contact surface 50d of the head portion 50 is positioned on the electrode base end 35 as shown in FIG.

In this state, the 8 mm communication hole 1 of the member to be welded 15 is
5b is fitted into the positioning pin 53a, and an 8 mm nut 17 is supplied from a nut feeder and welded in the same manner as described above.

In the above two embodiments, an example in which two lower electrodes are provided is shown. However, the present invention is not limited to this, and three or more lower electrodes can be provided. That is, in the first embodiment, three or more electrodes may be arranged in the longitudinal direction of the base 32, and in the second embodiment, if the electrode head portion 50 is, for example, an octahedron, three electrode heads 50 are provided on adjacent electrode mounting surfaces, and If the head part 50 is a decahedron, similarly, four lower electrodes can be provided on adjacent electrode mounting surfaces. In this case, all the lower electrodes may be electrodes having different diameters and positioning pins, or may be electrodes having the same size.

Further, the upper movable electrode 26 is used for both 6 mm and 8 mm, but may be provided separately as in the case of the lower electrode.

The insulating and floating rubber 46 is interposed between the base 32 and the electrode holding portion 36 or the support plate 48, but can also be used for absorbing and insulating a shock during pressure welding, which is useful. is there. Although it is interposed between the base 32 and the support plate 48, it is useful because it can also be used for absorbing shock and insulating at the time of pressure welding.

[Effects of the Invention] As described above, the present invention supplies a fastening member on a member to be welded, and welds the upper and lower electrodes attached to the electrode support member by pressing the upper and lower electrodes into contact with the member to be welded and the fastening member. In, on a base mounted on the lower electrode support member, a plurality of lower electrodes according to the size and type of the fastening member, linearly installed via rubber, linearly the base with a cylinder. A first invention configured to move and switch the plurality of electrodes, a fastening member is supplied on a member to be welded, and upper and lower electrodes attached to an electrode support member are pressed against the member to be welded and the fastening member. In a welding machine that is contacted and welded, a support plate is supported via rubber on a base mounted on a lower electrode support member, and a plurality of support plates are selected on the support plate according to the size and type of the fastening member. The lower electrode to the rotating electrode. The base is configured to be moved linearly by a first cylinder, and the electrode head is rotated by a rack and pinion mechanism operated by a second cylinder mounted on the base. (1) When two or more different fastening members are welded to a member to be welded, two or more welding members are used as in the conventional case. According to the present invention, there is no need to reset the member to be welded to the second fastening member welding machine after the first fastening member is provided and the second fastening member welding machine is provided. Welding can be performed in a short time without moving the place, which eliminates the need for equipment costs and installation space for one welding machine, shortens the delivery time by shortening the process, reduces labor costs by saving labor, and increases production costs There is an effect that can be reduced. (2) By mounting a plurality of lower electrodes on a base in a straight line via a rubber or rotatably by a rotating electrode head, in addition to lifting of the lower electrode after pressure welding by the upper electrode, pressure welding It is useful because it can also be used for absorbing shock and insulating at the time. (3) Since the rotating electrode head is configured to be rotated by the rack and pinion mechanism to switch the plurality of electrodes, the operation is reliable and the structure is simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of a welding machine according to a first embodiment of the present invention, FIG. 2 is a perspective view of a welding member according to the present invention, FIG. 3 is an enlarged view of the electrode switching device of FIG. 2, and FIG. Fig. 3 is a front view of a main part of Fig. 3, Fig. 5 is an enlarged perspective view of a main part of the second embodiment, Fig. 6 is a front view of a fifth main part, and Figs. FIG. 10 is an overall view of a conventional welding machine. 21; welding machine, 23; upper electrode support member, 24; lower electrode support member, 25; bed, 26; upper movable electrode, 31; electrode switching device, 32; base, 33; first air cylinder, 34; piston Rod, 35; electrode base end, 36, 37; electrode holder, 38, 52; first lower electrode, 39, 53; second lower electrode, 38a, 52a, 39a, 53a; positioning pin, 41; electrode actuator , 42; electrode holding part, 42a; electrode switching part, 43; second air cylinder, 44; piston rod, 45; rack, 46; rubber, 48; support plate, 49; pinion, 50; electrode head part, 51; shaft.

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A 2-97977 (JP, U) JP-A 63-47078 (JP, U) JP-A 57-200382 (JP, U) JP 1- 10378 (JP, U) JP 5413862 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 11/31 B23K 11/14 B23K 11/30

Claims (2)

(57) [Claims] 1. A welding machine for supplying a fastening member onto a member to be welded, and welding the upper and lower electrodes attached to the electrode support member by pressing the upper and lower electrodes into contact with the member to be welded and the fastening member. A plurality of lower electrodes are linearly installed on a base mounted on the base according to the size and type of the fastening member via rubber, and the base is linearly moved by a cylinder to form the plurality of electrodes. Characterized in that the welding machine is configured to switch the welding mode. 2. A welding machine for supplying a fastening member onto a member to be welded, and welding the upper and lower electrodes attached to the electrode support member by pressing the upper and lower electrodes into contact with the member to be welded and the fastening member. On the base mounted above, while supporting the support plate via rubber, the support plate is provided with a plurality of lower electrodes selected according to the size and type of the fastening member, installed by a rotating electrode head portion, The base is configured to be linearly movable by a first cylinder, and the electrode head is rotated by a rack and pinion mechanism operated by a second cylinder mounted on the base to switch the plurality of electrodes. A welding machine characterized by having such a configuration.