JP2551961B2 - Press machine with welding gun - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is configured such that a plurality of materials are positioned and press-molded in a mold including an upper mold and a lower mold, and spot welding is also performed. The present invention relates to a pressing device having a welding gun.

[Conventional technology]

Conventionally, a double-action type pressing device including an inner price and an outer slide is known, but this type of pressing device is, for example, an upper die blank holder part mounted on the outer slide, which is made of a material. After the outer peripheral portion is pressed and held, the upper die punch portion mounted on the inner slide performs drawing. (See Japanese Utility Model Laid-Open No. 61-152337). Usually, a desired press-formed product is obtained by press-forming one material, but the desired press-formed product is obtained by press-forming in the same mold with two or more materials positioned relative to each other. Sometimes. For example, one of the pillars is the one on which the safety belt is attached. In this pillar, the part on which the safety belt is attached requires strength because a thick plate material is used, while the lower part Materials such as thin plates are used because they do not have to be so strong. Two
In order to press-form two materials in the same mold, first, two materials 15, 16 are prepared as shown in FIG. 3 (a). Then, as shown in FIG. 3B, these two materials are pre-spot-welded in advance and positioned in the mold, or after positioning each other with a positioning pin, Press molding is performed as shown in c). Then, after the two press-molded materials 15 and 16 are removed from the press device, the main spot welding is performed.

[Problems to be solved by the invention]

However, as described above, if the main welding is performed after removing the press-molded material from the press device, not only the number of working steps increases but the price of the product cannot be reduced,
Since press molding and main welding are performed separately, there is a drawback in that the product accuracy cannot be improved.

[Means for solving problems]

In order to solve the above-mentioned problems, a press device having a welding gun according to the present invention is a press which is configured to press-form by positioning a plurality of materials in a mold including an upper mold and a lower mold. In the device, a pair of welding guns are built in the upper mold and the lower mold so as to sandwich the overlapping portions of the plurality of materials in a facing arrangement, and each of the welding guns has the material. In the press-molding, the urging means for generating a pressing force on the material necessary for spot welding is provided.

[Work]

According to the above configuration, press molding of the material and spot welding of the materials can be performed at the same time only by supplying a predetermined current to the welding gun during press molding. As a result, the temporary welding process between the materials and the main welding process after press molding can be reduced, the number of manufacturing processes can be reduced, and the product price can be significantly reduced. In addition, since press molding and spot welding are performed at the same time in a state in which a plurality of materials are positioned, it is possible to greatly contribute to improvement in accuracy of the press molded product.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the press apparatus according to the present invention, as shown in FIG. 1, a lower die 3 is provided on a bolster plate 1 in a fixed state, and an upper die 2 is placed on the lower die 3. A mold 4 is composed of the upper mold 2 and the lower mold 3. The lower mold 3 has a draw-forming recessed portion 3a formed substantially in the center thereof, and a blank hold portion 3b formed on the outer peripheral portion thereof. On the other hand, the upper die 2 is fitted in an upper die punch portion 2a corresponding to the above-mentioned draw-forming concave portion 3a, and an outer peripheral surface of the upper die punch portion 2a so as to be slidable up and down and to the blank hold portion 3b. Therefore, it is composed of the upper die blank holder portion 2b which holds the material 5 and the material 6 from above and below. The upper die punch portion 2a is fixed to the inner slide 7, and the upper die blank holder portion 2b is fixed to the outer slide 8. The inner slide 7 and the outer slide 8 are configured as a so-called double action press that drives independently of each other, and the upper die punch portion 2a and the upper die blank holder portion 2b can be driven separately. There is.

Further, the upper die 2 and the lower die 3 are respectively formed with lightening portions 2c ..., 3c ... for reducing the weight thereof, and the welding gun devices 9 ... are provided in the predetermined lightening portions 2c. Specified lightening part
Welding gun devices 10 are respectively arranged in 3c. As shown in FIG. 2, the welding gun device 9 includes a guide tube body 9a and a sliding portion 9b that is in sliding contact with the inner peripheral surface of the guide tube body 9a.
And a welding gun 9c that slides in the guide cylinder 9a by the sliding portion 9b, and urges the welding gun 9c toward the material 5 to press the tip of the welding gun 9c against the material 5. It is composed of a coil spring 9d as an urging means for generating a pressing force on the material 5 necessary for spot welding at the time of press molding of 5 and 6, and a current supply line 9e for supplying a necessary current to the welding gun 9c. ing. Similar to the welding gun device 9 described above, the welding gun device 10 also has a guide cylinder 10a and a sliding portion 10b.
A welding gun 10c, a coil spring 10d, and a current supply line 10e. The welding guns 9c and 10c forming a pair are provided in opposing positions so as to sandwich the materials 5 and 6 and through holes 2d penetrating from the lightening portions 2c and 3c to the outside. -The tips of the materials 5 and 6 can be located at the overlapping portions of the materials 5 and 6 via 3d.

In order to obtain a molded product from the above press machine, the material 5/6
Is positioned and placed on the lower mold 3. Next, when the press device is operated, first, the outer slide 8 descends and the upper die blank holder portion 2b descends, and the blanks 5 and 6 are moved up and down by the upper die blank holder portion 2b and the blank hold portion 3b. Hold from. At this time, each welding gun in the welding gun device 9 ... on the upper blank holder 2b side
The tip of 9c is pressed against the material 5 by the urging of the coil spring 9d, while the tip of each welding gun 10c in the welding gun device 10 on the side of the blank hold part 3b is urged against the material 6 by the urging of the coil spring 10d. It will be pressed. As a result, the above materials 5 and 6 required for spot welding
In addition to the pressure applied to the coil springs 9d and 10d, the biasing forces of the coil springs 9d and 10d act in mutually opposite directions, so that both biasing forces cancel each other out, and no distortion occurs due to the biasing force at the overlapping portions of the materials 5 and 6.

Next, the inner slide 7 descends and the upper die punch section 2a
And the raw materials 5 and 6 are drawn and formed, but at this time as well, the tip of each welding gun 9c in the welding gun device 9 ... While being pressed against the material 5 by the urging force of 9d, the tip of each welding gun 10c in the welding gun device 10 on the side of the drawing recess 3a is pressed against the material 6 by the urging force of the coil spring 10d. As a result, the pressure applied to the materials 5 and 6 necessary for spot welding is obtained, and the biasing force of the coil springs 9d and 10d is canceled out. There is no distortion due to power.

Then, as described above, when the upper die punch portion 2a and the upper die blank holder portion 2b are both lowered to form the materials 5 and 6, a current is applied between the welding guns 9c, 10c. Perform spot welding. Then, if the upper die punch portion 2a and the upper die blank holder portion 2b are raised in this order and then the material is taken out, a press-molded product with spot welding is obtained.

As described above, according to the pressing apparatus having the welding gun of the present invention, it is possible to press-form the materials 5 and 6 and press the materials 5 and 6 by simply supplying a predetermined current to the welding guns 9c and 10c during press molding. Spot welding can be done at the same time.
As a result, the temporary welding process between the raw materials 5 and 6 and the main welding process after press molding can be reduced, the manufacturing process can be simplified, and the product price can be significantly reduced. Besides,
Since press molding and spot welding can be performed simultaneously with a plurality of raw materials 5 and 6 positioned, the accuracy of the press molded product can be greatly improved.

In this embodiment, spot welding was performed when the upper die punch portion 2a and the upper die blank holder portion 2b were both lowered to form the raw materials 5 and 6, but the present invention is not limited to this. When the die blank holder portion 2b descends and press-holds the materials 5 and 6, the press-held portion is first spot-welded, and then the upper die punch portion 2a descends to perform draw forming, The draw-molded portion may be spot-welded.

〔The invention's effect〕

As described above, the press device having the welding gun according to the present invention is a press device in which a plurality of raw materials are respectively positioned and press-molded in the mold including the upper mold and the lower mold. In the upper mold and the lower mold, a pair of welding guns is built in the facing arrangement so as to sandwich the overlapping portions of the plurality of materials, and each of the welding guns is press-molded with the material, This is a configuration in which a biasing means for generating a pressing force on the material necessary for spot welding is provided.

As a result, press molding of materials and spot welding of materials can be performed at the same time, so that the number of steps can be reduced and the product price can be significantly reduced. Further, it also has an effect that it can greatly contribute to the improvement of precision of the press-molded product.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a sectional view of a main part of a press device having a welding gun, and FIG. 2 is an XX arrow in FIG. Visual enlarged cross section,
FIG. 3 shows a conventional example, where FIG. 3 (a) is a perspective view showing two materials, FIG. 3 (b) is a perspective view showing a state in which two materials are temporarily spot-welded, FIG. 3C is a perspective view showing a state where two materials are press-molded. 2 is an upper die, 2a is an upper punch portion, 2b is an upper blank holder portion, 3 is a lower die, 3a is a concave portion for drawing, 3b is a blank hold portion, 4 is a die, 5 and 6 are raw materials, 9・ 10 is a welding gun device, 9c and 10c are welding guns, and 9d and 10d are coil springs (biasing means).

Claims (1)

(57) [Claims] 1. A press apparatus in which a plurality of raw materials are positioned and press-molded in a mold including an upper die and a lower die, wherein the upper die and the lower die have the plurality of raw materials. A pair of welding guns are built in the facing arrangement so as to sandwich the overlapping parts in each other, and each of the welding guns generates a pressing force on the material necessary for spot welding during press molding of the material. A pressing device having a welding gun, characterized in that a biasing means for causing the welding gun is provided.