JPH0217750Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a stud welding chuck used for attaching a stud to be slit to a stud welding gun used for capacitor discharge type stud welding or arc stud welding. It is related to the device.

[Prior Art] As is generally known, capacitor discharge stud welding and arc stud welding are methods for welding studs of various diameters to base metals using discharge energy from a capacitor or electric energy for generating an arc. The welding operation is usually carried out by attaching the stud to be welded to a conductive chuck that is removably attached to a stud welding gun. This type of welding method has advantages such as simplicity, reliability and uniformity of welding, and is widely used in various industrial fields.

[Problems to be Solved by the Invention] In conventional stud welding, the chuck member attached to the stud welding gun is selected according to the thickness (diameter) of the stud to be welded. For this reason, there is no problem when continuously welding studs of the same diameter, but when selectively welding studs of various diameters, the chuck material must be adjusted to match each time the diameter of the stud to be welded changes. You need to replace it every time. Since the chuck member is usually attached to the stud welding gun body by an interference fit, replacing the chuck member is not only time-consuming, especially when removing the chuck member from the stud welding gun body, but also requires tools. Furthermore, it is necessary to bring to the welding work site a number of chuck members with different dimensions depending on the diameter of the studs to be welded. As a practical matter, it is practically extremely difficult, if not impossible, to replace chuck members like this when the welding work site is small or in an environment where workability is poor, such as at a high place. In such cases, chuck members are often replaced away from the welding work site at a location where tools and chuck members for replacement are located. When trying to randomly weld studs with different thicknesses and lengths, the simplicity and efficient welding workability that originally characterizes this type of stud welding is lost, and as a result, the welding Work becomes inefficient.

Therefore, the purpose of the present invention is to provide a stud welding chuck that overcomes the drawbacks and problems associated with conventional stud welding and can be adapted to studs of various thicknesses simply by adjusting the degree of tightening. The goal is to provide equipment.

[Means for Solving the Problems] In order to achieve the above object, the chuck device for stud welding according to the present invention is provided with a stud mounting hole extending from one end toward the other end, and a stud welding gun is installed at the other end. At least one slit is provided along the axial direction over substantially the entire length of the stud mounting hole in a cylindrical chuck body having a fitting portion that fits into the body in an electrically conductive state, A screw is provided around the outer periphery of the portion of the cylindrical chuck body, and a nut member is screwed onto the screw,
The present invention is characterized in that at least one of the screw and the nut member is formed into a tapered shape, and by adjusting the threading of the nut member, various studs with different diameters can be gripped.

[Function] In the chuck device for stud welding according to the present invention configured as described above, the diameter of the stud device hole in the cylindrical chuck body can be changed by the action of the slit provided in the cylindrical chuck body, and various thicknesses can be made. Studs can be attached. The diameter of the stud mounting hole is adjusted by adjusting the threading of a nut member that is threaded onto the outer circumferential thread of the cylindrical chuck body, and by turning this nut member in the tightening direction, the diameter of the stud mounting hole becomes smaller. Conversely, if the nut member is turned in the loosening direction, the diameter of the stud mounting hole will become larger. In this way, the diameter of the stud mounting hole in the cylindrical chuck body can be easily adjusted to the optimum diameter according to the thickness of the stud to be used.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows the overall structure of a chuck device for stud welding according to an embodiment of the present invention, which consists of a cylindrical chuck body 1 and a tapered nut member 2 screwed into the cylindrical chuck body 1. There is.

As shown in longitudinal section in FIG. 2, the cylindrical chuck body 1 has a central hole 3 for a stud mounting hole extending from one end to the other, and a conductive hole 3 in the body of a stud welding gun (not shown). The cylindrical chuck body 1 is provided with a slightly tapered fitting part 4 that fits together in a fixed state, and four slits 5 provided along the axial direction over almost the entire length of the central hole 3. A screw 6, which is engaged with the taper nut member 2, is provided approximately at the center in the longitudinal direction of the outer periphery. Four slits 5 are provided along the axial direction over substantially the entire length of the central hole 3, and are formed at an angle of 90 degrees to each other, as shown in FIG.

When using the illustrated device constructed in this way, first push the fitting part 4 of the cylindrical chuck body 1 into the body of the stud welding gun, and then taper it to match the diameter of the stud to be welded. By screwing and adjusting the nut member 2, the inner diameter of the central hole 3 for mounting the stud is set. By inserting the stud to be welded into the central hole 3 set in this way, the stud can be reliably attached to the chuck device. Stud welding can then be carried out in the usual manner. If necessary, as a guide for threading adjustment of the taper nut member 2, a scale corresponding to the diameter of the stud can be provided at an appropriate position, and the stud can be adjusted by rotating the taper nut member 2 according to the desired scale. Central hole 3 for mounting
The inner diameter may be set. By doing so, even a relatively inexperienced worker can easily set the diameter of the stud mounting hole according to the stud to be used.

Furthermore, in the illustrated embodiment, the number of slits 5 does not necessarily have to be four, but can be less than or more than four. The screw 6 provided around the outer periphery of the cylindrical chuck body 1 may be formed into a tapered shape that tapers toward the tip. In that case, the nut member 2 may be without a taper, and the fitting portion 4 is press-fitted into the main body of the stud welding gun, but if necessary, it may be constructed so that it can be mounted within the main body of the stud welding gun by threaded engagement.

[Effects of the invention] As explained above, in the chuck device for stud welding according to the present invention, a plurality of slits are provided along the longitudinal direction in the cylindrical chuck body,
By adjusting the threading of the taper nut member that engages with the screw provided around the outer circumference of the cylindrical chuck body, the stud mounting hole in the cylindrical chuck body can be optimized to match the thickness of the stud to be used. Since it is configured so that it can be easily adjusted to a suitable diameter, there is no need to replace the chuck device according to the thickness of the stud to be welded, unlike conventional methods. The operation can be continued simply by adjusting the threaded engagement of the taper nut member of the chuck device, and therefore stud welding can be carried out very efficiently, especially when studs of various thicknesses are selectively welded.

[Brief explanation of the drawing]

1 is a plan view schematically showing a chuck device for stud welding according to an embodiment of the present invention; FIG. 2 is a longitudinal sectional view of the cylindrical chuck body of the device shown in FIG. 1;
FIG. 3 is an enlarged view of the cylindrical chuck body viewed from the tip. In the figure, 1: cylindrical chuck body, 2: nut member, 3: center hole for stud attachment, 4: fitting part,
5: Slit, 6: Screw.

Claims (1)

[Scope of utility model registration request] A cylindrical chuck body is provided with a stud mounting hole extending from one end toward the other end, and has a fitting portion at the other end that is electrically conductively fitted into the main body of the stud welding gun. At least one slit is provided along the entire length in the axial direction, a screw is provided around the outer periphery of the portion of the cylindrical chuck body where the slit is provided, and a nut member is screwed onto this screw, and the screw and 1. A chuck device for stud welding, characterized in that at least one of the nut members is formed into a tapered shape, and by screwing and adjusting the nut member, various studs with different diameters can be gripped.