JPH08300161A - Welding equipment - Google Patents

Abstract

PURPOSE: To improve durability and operating accuracy of a holding cylinder in the case of housing a shaft-like part inside a retractable operating cylinder so as to be welded to an opposite member by constituting the holding cylinder of a nonsegmentary cylindrical member and also providing a means for restraining the shaft-like part inside the member. CONSTITUTION: A hole for forming a small diameter window is provided on the inside surface of a nonsegmentary holding cylinder 9 with a ball 24 inserted in this hole and with an elastic force imparted by a leaf spring 25 from the outside, so that a part of the ball 24 is protruded into the holding cylinder 9. The leaf spring 25 is fixed on the outside of the holding cylinder 9 with a bolt 26. Besides, an operating cylinder 3 is made a cylindrical member without segment, and a magnet 27 is embedded in the inner part thereof. In welding, when a shaft-like part 14 is charged into the holding cylinder 9 and also the operating cylinder 3 is lowered, the shaft-like part 14 is attracted by the magnet 27 and held in the operating cylinder 3. In addition, when the operating cylinder 3 is advanced to a welding position, the ball 24 is forcibly retreated by a flange 16 to bring the shaft-like member 14 into contact with the opposite member, thus welding is started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a field where a shaft-shaped component is housed in an operating cylinder and welded to a counterpart member, and is suitable for stud welding and projection welding.

[0002]

2. Description of the Related Art Referring to FIGS. 6, 7 and 8, the prior art will be described. This device is a stud welding machine, in which a working rod 2 is slidable in a support cylinder 1 having a circular cross section. Although not shown, the operating rod 2 is connected to an air cylinder (not shown) connected to the support cylinder 1. An operating cylinder 3 is connected to the operating rod 2 via a bolt 4, and this operating cylinder 3 can also slide in the support cylinder 1. The operating cylinder 3 is provided with a slit 5 over its longitudinal direction, and a taper portion 6 is formed at the tip. Support tube 1
A through hole 7 for the component is formed in the diagonally downward direction, and communicates with the inside of the support cylinder 1. A component supply pipe 8 is installed at a position corresponding to the through hole 7 and is connected to a parts feeder (not shown).

The holding cylinder 9 is installed in a continuous state with the support cylinder 1, and the threaded portion 10 provided on the support cylinder 1 is attached to the cap nut 11.
The support cylinder 1 and the holding cylinder 9 are integrated by tightening. The holding cylinder 9 is also provided with a slit 12 similar to that of the actuating cylinder 3, and a small diameter portion 13 is formed inside the tip portion thereof. The shaft-like component is a stud bolt made of iron and is shown by reference numeral 14, and comprises a shaft portion 15, a flange 16, and a protrusion 17 for melting, and the inner diameter of the small diameter portion 13 is the flange 16.
It is set slightly smaller than the outer diameter of. The bracket 18 fixed to the support cylinder 1, the air cylinder 20 fixed to the stationary member 19, the piston rod 21 and the like connected to the bracket 18 play a role of pushing down the entire apparatus at the time of welding. For convenience of space, the chain line is intentionally shown small.

In the initial state, the operating cylinder 3 is retracted upward as shown in FIG. 6, and when the stud bolt 14 descends from the component supply pipe 8 through the through hole 7, the supporting cylinder 1 is removed. Entering into the holding cylinder 9, the flange 16 is caught by the small diameter portion 13 and is locked as shown by the chain double-dashed line. Next, when the operating cylinder 3 descends, the inclined shaft portion 15 enters the operating cylinder 3 while being vertically erected by the tapered portion 6, and when the operating cylinder 3 further descends, the It becomes a state like and is stopped. That is, since the flange 16 and the tip of the actuating cylinder 3 push and expand the small diameter part 13, the holding cylinder 9
Open and the operating cylinder 3 closes and presses against the outer periphery of the shaft 15,
The stud bolt 14 is locked, and is welded to the counterpart component in the state shown in FIG. Note that FIG. 7 is slightly exaggerated for ease of understanding. FIG. 8 is a plan view of the holding cylinder 9 as viewed from below.

[0005]

With the welding apparatus as described above, the durability of the holding cylinder 9 becomes a problem. That is, during the transitional period in which the other member is welded in the state as shown in FIG. 7, both the flange 16 and the other member are melted in a state of being extremely close to each other, so that the holding tube 9 is elastically expanded to generate high heat. To receive the holding cylinder 9
The elastic performance of is decreased and the holding function as shown in FIG. 7 becomes insufficient. Further, due to the high heat, the shape of the tip portion of the holding cylinder 9 becomes abnormal, and the shape and size of the inner surface of the small-diameter portion 13 in particular are distorted. The holding and the elastic action as shown in FIG. 7 cannot be obtained. For this reason, it is necessary to replace the holding cylinder 9 in a short period of time, and therefore the cost of the holding cylinder and the time required for replacement are problems.

[0006]

Means for Solving the Problem and Its Action The present invention is provided to solve the above-mentioned problems.
According to a first aspect of the present invention, in the type in which the shaft-shaped component locked in the holding cylinder is housed in the advancing and retracting actuating cylinder and welded to the counterpart member, the holding cylinder is formed of a cylindrical member without slits, It is characterized in that means for locking the shaft-shaped part is installed inside thereof, and means for locking the shaft-shaped part protruding inside the holding cylinder locks the part, and The actuating cylinder advances, the shaft-like component is slightly projected from the holding cylinder, and then welded. According to a second aspect of the present invention, the means for locking the shaft-shaped component according to the first aspect is constituted by a rounded member that is elastically projected into the holding cylinder. Then, the flange forcibly retracts the locking means to be ready for welding. A third aspect of the present invention is characterized in that, in the first aspect, a magnet is installed in the actuation cylinder to hold the axial part, and the axial part is attracted and held by the magnet in the actuation cylinder. , To be welded.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the embodiments shown in FIGS. 1 to 3 will be described. The members having the same functions as those described with reference to FIG. . The holding cylinder 9 does not have the above-described notch, and means for locking the shaft-like component projects into the holding cylinder 9. That is, a hole 22 is opened in the holding cylinder 9 and a small diameter hole 23 is formed inside thereof.
And a part of the sphere 24 inserted into this hole 22 is held in the holding cylinder 9
The leaf spring 25 is made to project inward and the leaf spring 25 gives elasticity. The leaf spring 25 is fixed to the outer surface of the holding cylinder 9 with a bolt 26. On the other hand, the operating cylinder 3 is also made into a completely cylindrical member by omitting slitting, and a magnet (permanent magnet) 27 is embedded in the inner part thereof.

When the operating cylinder 3 descends while the thin component 14 is in the state shown by the solid line in FIG. 1, the shaft-shaped component 14 that has entered the operating barrel 3 is attracted by the magnet 27 to operate. The cylinder 3 is held. Then, when the operating cylinder 3 further advances, the flange 16 forcibly retracts the ball 24 to the state of FIG. 2, and subsequently the welding is performed. Reference numeral 28 is a counterpart steel plate component, and 29 is a fixed electrode.

In FIG. 4, a curved portion 30 is continuously formed in the leaf spring 25 instead of the rounded sphere 24, and the rounded portion is projected into the holding cylinder 9.

Further, in FIG. 5, a plurality of magnets 31 are embedded in the holding cylinder 9 instead of the balls 24 and the curved portion 30, and the descending stud bolts 14 are magnets 31.
Is sucked in and locked in the holding cylinder 9.

[0011]

According to the present invention, since the holding cylinder has a perfect cylindrical shape without slits, no adverse effect such as the conventional technique due to the relationship between spring characteristics and high heat occurs. Therefore, the function of locking the parts is accurately maintained for a long period of time, and the uneconomical problem of replacing the holding cylinder in a short period of time is solved.
Since the rounded locking means is elastically actuated in the holding cylinder, the parts are smoothly pushed out when the operating cylinder is advanced. Furthermore, since the operating cylinder is also a complete cylindrical member with no slits and the magnet is arranged inside it, it is not necessary to establish a delicate dimensional relationship with the holding cylinder as in the prior art. Also in terms of operation reliability is secured.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a side view in which a part of the shaft-shaped component is extruded and is vertically cut.

FIG. 3 is a partial vertical sectional side view showing a support portion of a sphere.

FIG. 4 is a partial vertical sectional side view showing a leaf spring type embodiment.

FIG. 5 is a partial vertical cross-sectional side view showing a holding cylinder when a magnet is adopted.

FIG. 6 is a vertical sectional side view of the related art.

FIG. 7 is a partial vertical cross-sectional side view showing a holding state of the stud bolt in FIG.

FIG. 8 is a plan view showing an end portion of a holding cylinder.

[Explanation of symbols]

 9 Holding cylinder 14 Shaft-shaped component 3 Actuating cylinder 28 Counterpart member 24, 30, 31 Means for locking the shaft-shaped component 24, 30 Rounded member 27 Magnet

Claims (3)

[Claims] 1. A type in which a shaft-shaped component locked in a holding cylinder is housed in an advancing / retreating type working cylinder and welded to a counterpart member, the holding cylinder is made of a cylindrical member without slits, A welding device, characterized in that means for locking a shaft-shaped component is installed inside thereof. 2. The welding device according to claim 1, wherein the means for locking the shaft-shaped component is constituted by a rounded member which is elastically projected into the holding cylinder. 3. The welding device according to claim 1, wherein a magnet is installed in the actuating cylinder to hold the shaft-shaped component.