JPH034454Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to the structure of a chip incorporated in a welding gun used for electric resistance welding such as spot welding. More specifically, the present invention relates to an improvement in a chip structure suitable for implanting stud materials such as pins and screws.

(Prior Art) Conventionally, as means for implanting stud materials such as pins and screws, the methods shown in FIGS. 8 to 10 are known, for example.

This conventional means consists of a stud material A having a joining flange AB and a fused protrusion AC at the tip of the threaded part AA.
This is the case where the material is planted on the board B.

That is, first, as shown in FIG. 8, a recess D is formed with a punch or the like to determine the position of the implant in the part of the plate material B to which one electrode C is attached, and then a recess is formed as shown in FIG. Abut the molten protrusion AC on D and erect the stud material A with fingers E, and further erect the tip 1 having the insertion hole 12 drilled in the axial direction from the dot surface 11 as shown in FIG. It is fitted onto the stud material A, which has been prepared, and pressed against the plate material B, and then energized.

The chip 1 is attached to a holder (not shown), and this holder is also attached to an arm (not shown) to constitute the other electrode (welding gun) for the electrode C, and when energized, the molten protrusion
The AC melts and welds the joining flange AB to the plate B, and the stud A is planted on the plate B.

(Problems to be solved by the invention) According to the conventional means of planting studs mentioned above, when performing continuous planting work, chips 1,
Since plate material B is heated, stud material A cannot be erected with fingers E in the state shown in Fig. 9, and a clamping tool or the like must be used instead of fingers E, which increases the work time. There is a problem with hanging.

Further, as a means to solve this problem, after inserting and fixing the stud material A into the insertion hole 12 with the diameter of the insertion hole 12 into which the stud material A is press-fitted, the pressing energization shown in FIG. 10 is performed. It is conceivable to omit the standing state of the stud material A in FIG. 9. However, in this solution, if the stud material A is provided with the threaded portion AA, when the stud material A is press-fitted into the insertion hole 12, the stud material A (threaded portion AA) and the tip 1 (the insertion hole 12 ), a new problem arises in that it damages both.

The present invention was made to solve these problems, and its purpose is to provide a welding gun chip structure that allows for easy continuous planting without damaging the stud material. .

(Means for Solving the Problems) The welding gun tip structure according to the present invention is a welding gun chip structure in which a stud material insertion hole is drilled in the axial direction from the dot surface in order to implant stud materials such as pins and screws. In the gun chip structure, a means is adopted in which a magnet is attached around the insertion hole.

(Function) The tip structure of the welding gun according to the present invention obtains the effect of fixing the stud material inserted into the insertion hole by attaching a magnet around the insertion hole. This prevents damage to the material.

(Example) Hereinafter, an example of the chip structure of a welding gun according to the present invention will be described with reference to FIGS. 1 to 7.

As shown in FIG. 1, the welding gun G has chips 1,
It consists of a holder 2 and an arm 3.

The chip 1 is mainly made of copper (Cu) and has a substantially cylindrical shape as a whole, and has an insertion hole 12 drilled in the axial direction from the dot surface 11, and a cooling hole 12 in the axial direction from the surface opposite to the dot surface 11. 13 are drilled. A plurality of stages of magnet 4 mounting portions 14 are bored in the lower outer peripheral surface of the chip 1 in the axial direction of the chip 1.
A magnet 4 is attached to each of the attachment portions 14.

The holder 2 has a generally cylindrical shape as a whole, and its upper end 21 is closed and its lower end 22 is open, and the cooling hole 13 side of the chip 1 is fitted and fixed thereto. Also,
There are two connection holes 23 near the upper end 21 of the holder 2,
24 is provided, and a tube 25 that separates and communicates each of these connection holes 23 and 24 with the internal gap of the holder 2 is connected to one connection hole 23 side. Note that the connection holes 23 and 24 have inlet tubes 26,
Outlet tubes 27 are connected respectively.

The arm 3 supports the holder 2,
Its end is connected to the terminal 5 of the transformer.

Such a welding gun G serves as the other electrode for one electrode 8 connected to the other terminal 6 of the transformer equipment and attached to the plate material 7 on the side to be welded. The welding gun G, electrode 8, transformer, etc. constitute a welding device.

In this welding machine, when the stud material A is first inserted into the insertion hole 12, the stud material A is inserted into the insertion hole 12.
is attracted and fixed in the insertion hole 12 by the magnetic force of the magnet 4 around it. In this state, when the stud material A is pressed against the plate material B and electricity is applied from the terminals 5 and 6, the molten protrusion AC melts and the joining flange AB is welded to the plate material 7, and the stud material A is attached to the plate material 7.
The work to plant it will be completed. The cooling water W is supplied from the inlet tube 26, and the supplied cooling water W passes through the tube 25, enters and flows out of the cooling hole 13 of the chip 1, and is discharged from the outlet tube 27. It cools the chip 1 and enables continuous power supply and machining.

In this type of planting work of stud material A, stud material A is fixed to the chip 1 side, so the conventional erection of stud material 1 as shown in Fig. 9 is unnecessary, and the work time is reduced. will be simplified. In addition, as mentioned above, it is unnecessary to stand the stud material A, and the positioning of the stud A is done at the same time as the welding gun G hits the plate material 7. It is no longer necessary to form a recess D in the plate material 7, and from this point of view as well, the machining time is simplified. Furthermore, since the stud material A is fixed to the chip 1 side by the magnetic force of the magnet 4, even if the stud material A is provided with a threaded portion AA, both the chip 1 and the stud material A may be damaged. do not have.

FIG. 2 and subsequent figures show an example of how the magnet 4 is attached to the chip 1. As shown in FIG. 2, when the magnet 4 is attached to the bag-shaped attachment part 14, which is formed by drilling a hole from the outside of the chip 1 toward the insertion hole 12 and leaving a gap S to the insertion hole 12, It is possible to avoid the formation of an opening burr in the insertion hole 12 when a hole reaching up to the hole is provided, and this is effective in preventing damage to the threaded portion AA of the stud material A. Third
As shown in FIG. 4, when a plurality of magnets 4 are provided in multiple stages in the axial direction of the chip 1,
Due to deterioration of the dot surface 11, the tip was cut off (including the bottom magnet 4) and a new dot surface 1 was created.
1 is formed, the other magnet 4 remains, so there is an advantage that the fixing function of the stud material A is maintained. Further, as shown in FIG. 3, the magnets 4 are installed around the insertion hole 12 in different directions so as to face each other, and as shown in FIG. By arranging and attaching the studs around the entire circumference, there is an advantage that the magnetic attraction force within the insertion hole 12 can be equalized and the stud material A can be accurately fixed on the axis of the chip 1 without tilting. According to this advantage, even if the shape of the insertion hole 12 is enlarged to accommodate studs A of various diameters, it is effective in preventing the studs A from tipping. As shown in Figure 5,
When the mounting portion 14 is provided around the entire outer circumference of the chip 1 and the magnet 4 is shaped like a ring with a portion cut out, the magnet 4 can be attached to the chip 1.
There is an advantage that the magnet 4 can be replaced in response to a decrease in the magnetic force of the magnet 4 due to heat or the material of the stud material A. 6th
As shown in the figure, when the magnet 4 is mounted so as to be embedded inside the chip 1, there is an advantage that the magnet 4 can be prevented from colliding with other tools or the like and being damaged during machining. As shown in FIG. 7, if the groove 4' of the magnet 4 is fitted into the protruding mounting portion 14 provided on the chip 1, there is an advantage that the magnet 4 can be replaced as in FIG.

(Effects of the invention) As described above, in the chip structure of the welding gun according to the present invention, the stud material is fixed to the chip side, so there is no need for erecting the stud material and positioning work, which simplifies the work. This effect allows continuous planting work to be carried out efficiently and has the effect of reducing the cost of planting work.

Furthermore, since the stud material is attracted and fixed by the magnetic force of the magnet, damage to both the stud material and the chip is prevented, the work finish is improved, and the durability of the chip side is improved.

[Brief explanation of the drawing]

Fig. 1 is a welding machine showing an embodiment of the chip structure of the welding gun according to the present invention, a sectional view of the entire welding material, and Fig. 2 is a sectional view of the entire welding material.
The figure is an enlarged view of the main part of FIG. 1, FIGS. 3 and 4 are perspective views showing examples of magnet installation, and FIGS. 5 to 7 are sectional views showing examples of magnet installation, respectively.
FIGS. 8 to 10 are process diagrams showing a conventional example. 1... Chip, 4... Magnet, 11... Dot surface, 12... Insertion hole, A... Stud material, G...
...Welding gun.

Claims (1)

[Scope of utility model registration request] In a welding gun chip structure in which stud material insertion holes are drilled in the axial direction from the dot surface in order to implant stud materials such as pins and screws, a plurality of holes are formed in the lower outer peripheral surface of the chip in the axial direction of the chip. A welding gun chip structure characterized in that a magnet mounting hole in the form of a stacked bag is bored and a magnet is mounted in the mounting hole.