JPS595515Y2 - Welding parts positioning device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a positioning device for parts to be projection welded onto a steel plate or the like.

The case of a nut will be explained as a welded part to be projection welded.

1 to 3 are sectional views showing three different forms of projection welding a nut 1 to an iron plate 2.

Figure 1 shows the case where a hole 3 is drilled in the steel plate 2 and is used to pass the bolt through, and the nut 1 is welded to this hole position, Figure 2 shows the case where there is no hole, and Figure 3 shows the case where there is a protrusion near the welding position. Thing 4
Indicates when there are obstacles such as

A prior art welding nut positioning device for projection welding a nut delivered by an automatic component feeder onto a steel plate is shown in longitudinal section in FIG.

A protrusion 4 is provided on the iron plate 2.

5 is a pneumatic transfer pipe, which is a parts sorting and supplying device (not shown)
Nuts 1 to be projection welded are sent out one by one with the sides to be welded aligned in a predetermined direction, and are guided above the welding location and held by a holding part 6.

Reference numeral 7 denotes a cylinder coupled and supported by this holding portion, which is a pneumatic or hydraulic cylinder, and has a piston rod 8 protruding downward.

9 is a holding rod that is connected to this piston rod and holds the nut 1 at the bottom by holding means such as electromagnetic force, vacuum suction, combs, etc., and 10 is a lower electrode on which the iron plate 2 is placed, which is in the shape of a thick plate or a rod. ing.

11 is an upper electrode corresponding to this lower electrode, and cylinder 1
It is screwed to the end of the piston rod 13 of No. 2 and is moved up and down.

This upper electrode 11 is designed to be replaceable, and has a structure through which cooling water (not shown) passes to prevent overheating.

Reference numeral 14 denotes a guide tool, which is positioned at the welding point of a guide hole 15 at the lower end, and positions and guides the nut 1, which has separated from the lower part of the lowered holding rod 9 shown by the chain line and fallen, into the guide hole 15.

16 is a cylinder, consisting of a pneumatic or hydraulic cylinder;
A guide tool 14 is fixed to a piston rod 17 and can be moved up and down.

FIG. 5 is a perspective view of the guide tool 14 portion.

Next, the operation of the device according to the above-mentioned prior art will be explained.

Nuts 1 for projection welding are sent out one by one with the welding side aligned in a predetermined direction by a parts sorting and supplying device (not shown), and are fed under pressure through a pneumatic transfer pipe 5 to a holding part 6, where they are attached to a holding rod 9. held at the bottom.

Once the welding position is determined by moving and adjusting the iron plate 2 on the lower electrode 10, it is fixed.

By operating the cylinder 16, the guide tool 14 is lowered and its lower end is brought to the welding position on the iron plate 2.

Next, the holding rod 9 is lowered by operating the cylinder 7,
The nut 1 is dropped into the guide hole 15 and held in position.

Then, by operating the cylinder 12, the upper electrode 11 is lowered and the nut 1 is crimped at a fixed welding point.

At this time, the guide tool 14 is raised so that its lower end is slightly separated from the upper surface of the iron plate 2 to prevent welding due to energization.

Here, the upper electrode 11 is energized and the nut 1 is projection welded onto the iron plate 1.

After welding, the upper electrode 11 and guide tool 14 are raised to complete the welding process.

In this case, the upper electrode 11 needs to have a smaller outer diameter than the guide hole 15 so as not to hit the guide tool 14.

Next, if the nut has an unusual shape or a different outer diameter, as shown in the cross-sectional view in FIG. and hold the guide.

In this case, when the height of the upper part of the bushing 18 is lower than the upper part of the bushing 18, the outer diameter of the upper electrode 11 is adjusted to the guide part of the bushing 18 so that there is no problem in raising the guide tool 14 a little.
It is necessary to replace it with one smaller than the inner diameter of L19.

The above-mentioned prior art welding nut positioning device requires replacing the upper electrode with one of a different outer diameter each time the nut has a different outer diameter or shape, and requires a large number of electrodes of various sizes, which must be replaced each time. There must be.

Further, it is necessary to prepare a variety of bushes 18 with different hole diameters.

Moreover, the hole diameter of the guide hole 15, 19 requires a certain clearance relative to the outer diameter of the nut, and the welding position of the nut becomes inaccurate by that dimension.

Furthermore, projection welding on iron plates etc. is not limited to nuts, but also other parts, and the upper electrode 11. The guide tool 14 and the bush 18 must be removed, replaced, and installed frequently each time, resulting in poor workability and impeding complete automation.

This idea is such that both scissor parts extending from the lower ends of a pair of scissor members are opened and closed uniformly to the left and right, and a guide consisting of these parts is supported on a piston rod of a cylinder so that it can be moved up and down. , Place the lower ends of both scissors on the plate material to be welded, open both scissors to the left and right with this point centered on the center point of the welding position, feed the welding part between these two scissors, and press both scissors. The parts are aligned with the fixed point of the welding position by closing, and then the parts are opened and raised, and the upper electrode is lowered to press the parts onto the plate material and weld them. This is a positioning device for welding parts that is used for a small number of scissor members, and the upper electrode is shared by those with a large outer diameter, improving work efficiency and enabling complete automation.Also, it is a positioning device for welding parts with high precision for welding positioning of parts. is intended to provide.

Fig. 7 shows a positioning device for welded parts according to an embodiment of this invention, and is a vertical sectional view when project welding a nut, and Fig. 8 is a partially sectional plan view of the guide tool shown in Fig. 7. 1,2.4 to 10,12,13°16.17 are the same as the device according to the above-mentioned prior art.

In FIGS. 7 and 8, numeral 21 denotes a guide tool for positioning the nut 1, and its structure is as follows.

22 is an intermediate support plate fixed to the piston rod 17 of the cylinder 16; 23 and 24 are intermediate hinge parts 23a and 2;
A pair of scissors members whose 4 a is penetrated by the tip of the piston rod 17 and supported so as to be rotatable to open and close, the tips are extended downward and bent horizontally, and both opposing sides are V-shaped. Notched scissor parts 25 and 26 are formed so that the nut 1 to be welded can be aligned from the left and right with the scissors.

These scissors 25 and 26 allow the nut 1 to be aligned with the welding center point P on the front extension of the intermediate support plate 22 without any problem even if the nut 1 has a different outer shape.

Reference numerals 28 and 29 denote a pair of cylindrical bushes rotatably mounted on the rear end sides of the scissor members 23 and 24, the bushes 28 being shown in FIG. 9 and the bush 29 shown in FIG. 10.

30 is a protruding screw portion 28 fixed to one bush 28
A cylinder is connected to a fixed part and consists of a pneumatic or hydraulic cylinder.

31 is the piston rod of the cylinder 29, and the bushes 28, 29
It passes through the rear end side of the intermediate support plate 22 , and the bushing 29 is fixed at the distal end by a snap ring 33 via a spacer tube 32 .

34 is a pair of compression spring members inserted between the intermediate support plate 22 and the scissor members 23 and 24, which have the same spring constant;
The scissors 23,24 are uniformly pressed in the closing direction by the scissors 25,26.

20 is an upper electrode fixed to the piston rod 13, and has a relatively thick outer diameter.

In the apparatus of the above-described embodiment, the nuts 1, which are sent out one by one with the welding side facing a predetermined side by the component sorting and supplying device (not shown), are transferred to the holding section 6 through the pneumatic transfer pipe 5 to the holding rod 9. is held at the bottom of the

Move and adjust the iron plate 2 to determine the welding position and fix it.

At this time, the welding position center point P is on the front extension line of the intermediate support plate 22.

By operating the cylinder 16, the guide tool 21 is lowered to bring the lower end of the scissor member 23.24 to the welding position on the steel plate, and by operating the cylinder 30, the scissor part 25.26 is moved uniformly left and right around the intermediate support plate 22. open.

Next, the holding rod 9 is lowered by operating the cylinder 7,
The nut 1 is dropped between the two scissors 25 and 26.

When the cylinder 30 is operated and the scissors 25 and 26 are uniformly closed around the extension line of the intermediate support plate 22, the nut 1 is pinched and aligned with the center point P of the welding position.

This state is shown in FIG. Usually the scissor member 23.2
4 opens and closes the scissors 25 and 26 side twice to the left and right to ensure that the nut 1 is aligned with the fixed welding point.

Here, by operating the cylinder 30, the sides of the scissors 25 and 26 are opened to the left and right as shown in FIG. 12, and by operating the cylinder 16, the guide tool 21 is raised.

Subsequently, the upper electrode 20 is lowered as shown by arrow A, the nut 1 is crimped onto the iron plate 2, and projection welded by applying current.

After welding, the upper electrode 11 is raised to complete the welding process.

In this case, the upper electrode 20 has a large outer diameter so that various nuts can be welded to it.

When welding, the scissor member 23.24 is attached to the scissor part 25.2.
Since the 6th side is opened and raised, there is no problem even if the upper electrode 11 has a large diameter.

Moreover, the scissors members 23 and 24 have a shape that does not cause any problem even if the protrusion 4 is located near the welding position.

FIG. 13 is a plan view, partially in section, of a guide tool according to another embodiment of the invention.

The guide tool 41 is structured as follows.

An intermediate support plate 35 is fixed to the piston rod 17, and the support arm 3
6 is put out to support the low speed electric motor 37.

A pair of cylindrical threaded bushes 38 are attached to the rear end sides of a pair of scissor members 23, 24 which are supported on the tip side of the piston rod 17 so as to be openable and closable.

This threaded bushing 38 is shown in a perspective view in FIG.

Reference numeral 39 denotes a threaded shaft that is connected to the shaft of the electric motor 37 and rotated reversibly.The leading end 39a and the rear end 39b are threaded in different directions, respectively, so that the threaded shaft 38 can be rotated reversibly. The middle part passes through the through hole 35a of the intermediate support plate 35 so as to be movable in the horizontal direction, and has a pair of ribs 4.
0, it is supported in the axial direction by the intermediate support plate 35.

The scissor members 23, 24 are rotated in one direction and the opposite direction by the electric motor 37, and the scissors 25, 26 are attached to the intermediate support plate 35.
It is rotated so as to uniformly open and close left and right around a center point P on the front side extension line.

The rotation of the electric motor 37 is automatically stopped using a timer, a limit switch, or the like.

In the above embodiment, projection welding is applied to a welded nut, but the projection welding is not limited to this and can be applied to other welded parts.

Furthermore, although the steel plate 1 is used as the plate material to be welded, the present invention is not limited to this, and any material that can be projection welded can be used.

Furthermore, it can be applied without any problem even if there is a pilot hole or a through hole for a bolt at the welding position of the plate material to be welded.

As described above, according to this invention, the scissors on both the extended lower ends of the pair of scissors members of the guide tool are made to open and close uniformly to the left and right, and the scissors are fed into the welding position on the plate material to be welded. The parts to be welded are sandwiched uniformly from the left and right sides with both scissors to align them to the welding point, and both scissors are opened to the left and right and the upper electrode is lowered to crimp and weld the parts. Therefore, even if the outer diameter and shape of the welded parts are different, a small number of guide tools can be used, and the upper electrode with a large outer diameter can be shared without having to be replaced, improving work efficiency and enabling complete automation. Become.

In addition, welding positioning of parts can be performed with high precision.

[Brief explanation of drawings]

Figures 1 to 3 are cross-sectional views showing different forms when projection welding oak I to a steel plate, and Figure 4.
The figure is a longitudinal sectional view showing a positioning device for a welding nut according to the prior art, FIG. 5 is a perspective view showing a state in which a nut is fed into the positioning device of FIG. 4, and FIG. 6 is a guide tool showing another example according to the prior art. Fig. 7 is a longitudinal sectional view showing a positioning device for welded parts according to an embodiment of this invention, and Fig. 8 shows a part of the guide tool shown in Fig. 7 in cross section. 9 and 10 are perspective views of the pair of cylindrical bushings shown in FIG. 8, and FIG. 11 shows the nut being fed into the guide tool shown in FIG. Fig. 12 is a perspective view showing a state in which both scissors are opened from the state in Fig. 11 and before the welding process, and Fig. 13 is another embodiment of this invention. Fig. 14 is a cross-sectional plan view of a part of the guide tool according to Fig. 1.
FIG. 4 is a perspective view of the cylindrical threaded bushing of FIG. 3; 1...Natsuto, 2...Teppan, 10...
...Lower electrode, 16...Cylinder, 17.
... Piston rod, 20 ... Upper electrode, 2
1... Guide tool, 22... Intermediate support plate,
23, 24... Scissors member, 25.26...
... Scissor part, 30 ... Cylinder, 31 ...
... Piston rod, 34 ... Spring member, 35
......Intermediate support plate, 36...Support arm, 3
7...Electric motor, 39...Screw shaft, 39
a...Top side, 39b...Rear end side,
40...Brim, 41...Guiding tool. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (5)

[Scope of utility model registration request] (1) In a device for projection welding by aligning the welding part fed into the welding position on the upper surface of the plate to be welded which is fixed on the lower electrode, and lowering the upper electrode,
A cylinder that is attached to a fixed part in the vertical direction and moves the piston rod up and down, an intermediate support plate that is fixed to the piston rod and has an end protruding rearward, and both ends are extended downward and the ends are folded horizontally. The scissors are bent to form mutually opposing scissors, and both of these scissors are supported at the middle part on the tip side of the piston rod so that they can be opened and closed to the left and right, and when the piston rod is lowered, both of the scissors are opened and closed. a pair of scissors that extend onto the plate to be welded, and a pair of scissors that opens and closes both scissors uniformly from side to side centering on the extension line on the front side with respect to the intermediate support plate. opening/closing means for rotating the member, the member is lowered onto the welding plate, opens both scissors around the center point of the welding position, and the welded part fed into the middle is opened between the two scissors. A positioning device for welding parts, characterized in that the scissors are aligned with the center point of the welding position, the scissors are opened, and the upper electrode is lowered to be welded. (2) The positioning device for a welded part according to claim 1, wherein the welded part is a nut. (3) The opening/closing means connects the fixed side of the cylinder to the rear end of one scissor member, the piston rod passes through the intermediate support plate and connects the tip to the rear end of the other scissor member, and the The welded part according to claim 1 of the utility model registration claim, wherein spring members having the same spring constant are installed between the support plate and both scissor members, respectively, so that both scissor parts open and close uniformly. Positioning device. (4) The opening/closing means includes an electric motor supported by an intermediate support plate via a support arm, a motor shaft connected to the electric motor shaft, an intermediate portion of which penetrates the intermediate support plate, and is supported in the axial direction by a collar. The end sides are threaded in different directions, and each has a threaded shaft threaded through the rear end of one and the other scissor member, and by reversible rotation of this threaded shaft, both scissor parts can be uniformly threaded. The positioning device for welded parts according to claim 1, characterized in that the device is configured to open and close. (5) The welded part according to any one of claims 1 to 4 of the claims for utility model registration, characterized in that both scissor parts are cut out in a V-shape so that they face each other. Positioning device.