KR20190136806A - Stud welding gun - Google Patents

Abstract

The present invention relates to a stud welding gun comprising: a stud chuck including a cylindrical chuck body, a bolt insertion unit formed on one end of the chuck body, and a fixing unit formed on the other end, and forming a plurality of elastic parts by a plurality of slit grooves formed in the longitudinal direction of the chuck body; a chuck adapter including a guide hole to slide and guide the outer circumferential surfaces of the elastic parts of the chuck body, a fixing unit to be fixed on a gun body, and a plurality of seating grooves formed in a taper structure of a prescribed angle between the guide hole and the fixing unit; and preloading rings which are arranged on the seating grooves at regular intervals, and form contact in at least two rows on the outer circumferential surfaces of the elastic parts. The stud chuck is firstly pressed when moving along the guide hole of the chuck adapter and is secondly pressed at a preset pressure by the preloading rings. Accordingly, the elastic power of the stud chuck is maintained by the preloading rings arranged in the chuck adapter to insert and use stud bolts of various specifications and improve stud bolt fusion performance when welding.

Description

Stud Welding Gun {STUD WELDING GUN}

The present invention relates to a stud welding gun, and more specifically, to continuously provide a preload on the elastic piece of the stud chuck can maintain the fixed posture of the stud bolt in place during the welding process, stud bolts of various specifications The present invention relates to a stud welding gun with improved bolt compatibility by using as a stud chuck.

In general, the method of stud welding is widely used when fixing an insulator pin for fixing an insulator to a wall structure of a cabin or when joining a vehicle body panel of an automobile, and using arc stud welding and It is used as a capacitor-discharge stud welding method.

Such stud welding generates an arc with a direct current, and requires a stud welding gun used as an electrode holder for controlling and welding a welding current.

The power supply of the arc stud welding can be used as a motor generator, a transformer rectification or a battery charging, and the power supply of the charge-discharge welding can be used by charging a relatively low power.

In particular, arc stud welding melts and studs the stud to the base material by instantaneous arc welding by bringing a stud including a steel bar, a brass bar, or bolts and pins into contact with the base metal material and passing current. For example, power is supplied to a solenoid coil configured inside the stud welding gun, the stud is arced on the base material, and the stud base and the base material are melt-bonded by the arc. At this time, when the preset welding time elapses, the welding power is automatically cut off and the solenoid power inside the gun is also cut off.

As a well-known stud welding apparatus, a stud gun capable of continuous welding is disclosed in Korean Patent Publication No. 10-2009-0026469.

1 is a schematic diagram illustrating a conventional stud welding gun.

Referring to the drawings, a conventional stud welding gun has a gun body 3 with a switch 8, a guide passage 2a extending from the gun body 3, and is loaded into the guide passage 2a. A movable rod 2 holding the stud bolt 6 and a guide rod 2a are installed to be moved back and forth by pneumatic pressure and move the stud bolt S to the chuck 1 during forward movement. (7), the plurality of stud bolts (S) mounted on the support plate (6) mounted on the lower part of the movable body (2) and supported by the spring (6) is pushed up by the elastic force of the spring (6) And a loading box 4 for supplying the guide passage 2a.

The pneumatic pressure is supplied from a compressor (not shown) installed externally, and the gun body 3 and the push rod (manufactured of a conductive metal) through an electrical cable 9 connected to the rear end of the gun body 3 are typically 7) and a predetermined arc current which flows into the chuck 1 in advance, and melt-bonding is performed between the stud S held by the chuck 1 and the contact surface to the base material.

The stud bolt is a stud chuck in which a plurality of elastic pieces are formed in the longitudinal direction of the chuck body, as disclosed in Patent No. 10-1373525, registered on March 05, 2014, and is widely used by a so-called single type stud chuck. do.

However, the above-described conventional stud gun has a problem in that an elastic piece that forms a stud chuck when the bolt welding is performed for a long time is opened, thereby weakening the binding force of the stud bolt and leaving the position in place.

For example, in the process of placing the head part of the stud bolt inserted into the stud chuck to the target position of the base material for welding, overvoltage and overcurrent frequently occur in the stud chuck, and at least one forming the stud chuck in this process. Of the elastic pieces may cause structural deformation and flaring, resulting in a poor fixing position of the stud bolt.

Accordingly, the welding and fusion failure of the stud bolts in the process of work is increased to reduce the productivity significantly.

-Korean Patent Publication No. 10-2009-0026469 (published March 13, 2009) -Korean Patent Registration No. 10-1373525 (registered on March 5, 2014)

Disclosed is an object of the present invention to provide an improved stud welding gun in which a fixed posture of a stud bolt can be maintained and fused in the welding process by continuously providing a preload on an elastic piece of a stud chuck.

It is also an object of the present invention to provide an improved stud welding gun with good bolt compatibility by utilizing stud bolts of various specifications as one stud chuck.

It is also an object of the present invention to provide a stud welding gun in which the moving section of the push rod is variably adjusted and constrained to improve the welding performance of the stud bolt.

As a means for achieving the above object, one feature of the disclosed invention includes a gun body with a handle, a switch provided on one side of the handle and a push rod for selectively connecting the arc current by the switch operation. In the stud welding gun for arc welding the stud bolt,

A cylindrical chuck body, a bolt insertion hole formed at one end of the chuck body and a fixed portion formed at the other end, and a plurality of elastic pieces are formed by a plurality of slit grooves formed in the longitudinal direction of the chuck body Stud chuck;

A chuck having a guide hole for sliding the outer peripheral surface of the elastic piece of the chuck body, a fixing portion for fixing to the gun body, and a plurality of seating grooves formed in a tapered structure at a predetermined angle between the guide hole and the fixing portion. adapter;

And a preload ring disposed in the seating groove at predetermined intervals to form at least two arrays of contacts on the outer circumferential surface of the elastic piece.

The stud chuck provides a stud welding gun that is pressurized first when moving along the guide hole of the chuck adapter, and pressurized second by a pre-set pressure by the preload ring.

Another feature of the disclosed invention, the seating groove includes a first seating groove and a second seating groove spaced apart from the first seating groove, wherein the first seating groove and the second seating groove are each formed at a different taper angle Provides a stud welding gun.

Another feature of the disclosed invention provides a stud welding gun, wherein the preload ring comprises at least one stopper raised from an inner circumferential surface.

Another feature of the disclosed invention is a push rod adjustment lever having a plug fixed to a cap formed at the rear end of the gun body and a variable rod coupled to the plug with a screw pitch structure to restrain the moving section of the push rod. It provides a stud welding gun further comprises.

According to the published description of the invention,

The preload ring provided inside the chuck adapter maintains the elastic force of the stud chuck, thereby improving the stud bolt fixing and fusion performance.

In addition, according to the disclosure of the disclosed invention,

The push rod control lever has an advantage of being able to be used interchangeably for stud bolts manufactured in various lengths by varying the connection section between the push rod and the stud bolt providing arc power.

1 is a schematic view showing a conventional stud welding gun
2 is a schematic view showing a stud welding gun according to one embodiment of the disclosed invention;
3A is a schematic diagram illustrating a cross section of a chuck adapter and a stud chuck according to one embodiment;
Figure 3b is a schematic diagram showing the cross section of the chuck adapter and the stud chuck according to another embodiment;
Figure 4 is a schematic perspective view showing the assembled state of the chuck adapter and the stud chuck in accordance with an embodiment of the disclosed invention,
5 is a perspective view showing a push rod adjustment lever in accordance with an embodiment of the disclosed invention;
6 is a side view of a preload ring according to another embodiment;

Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The devices and components defined in the detailed description are intended to assist those skilled in the art in order to assist in understanding the invention, but are not limited to the embodiments presented herein.

Stud welding gun according to the present invention described below may include the same configuration as the conventional stud welding gun shown in Figure 1 will be described with reference to the same reference numerals for the same configuration.

Figure 2 is a schematic diagram showing a stud welding gun according to an embodiment of the disclosed invention, Figure 3a is a schematic diagram showing the cross-section of the chuck adapter and the stud chuck according to one embodiment, Figure 3b is a chuck according to another embodiment Schematic diagram showing the cross-section of the adapter and the stud chuck, Figure 4 is a schematic perspective view showing the assembled state of the chuck adapter and the stud chuck in accordance with an embodiment of the disclosed invention, Figure 5 is a push rod in accordance with an embodiment of the disclosed invention Figure 6 is a perspective view of the adjustment lever, Figure 6 is a side view of the preload ring according to another embodiment.

The stud welding gun according to the invention disclosed is a predetermined arc current set in advance on the stud chuck 20 and the push rod 7 made of a conductive metal, typically via an electrical cable 9 connected inside the gun body 3. Flow is caused by arc welding between the stud bolts (S) and the contact surface to the substrate.

More specifically, referring to Figures 2 to 3a, the disclosed invention,

A stud including a gun body 3 having a handle 3a, a switch 8 provided on one side of the handle 3a, and a push rod 7 for selectively connecting the arc current by the switch operation. In the stud welding gun for arc welding the bolt (S),

It has a cylindrical chuck body 21, a bolt charging hole 22 formed at one end of the chuck body 21 and a fixing portion 23 formed at the other end, the longitudinal direction of the chuck body 21 And a stud chuck 20 for forming a plurality of elastic pieces 24 by a plurality of slit grooves 25 formed in the shape.

The stud chuck 20 has a well-known stud chuck taper structure cut into a plurality of elastic pieces 24 along the longitudinal direction of the stud chuck, and includes a supply part through which a stud bolt S is supplied and an extension part to the supply part. And a shaft diameter portion that is reduced to gradually narrow the inner diameter along the front side with respect to the supply portion, and the stud bolt head is exposed to the outside of the elastic piece 24 with a diameter extending to the shaft diameter portion and smaller than the supply portion and the stud bolt body. It may be configured to include a gripping portion that is held in the elastic piece 24.

Stud welding gun according to an embodiment of the present invention, the guide hole 31 for sliding the outer peripheral surface of the elastic piece 24 of the chuck body 1 and fixed to the chuck adapter mounting portion (3b) of the gun body (3) And a chuck adapter 30 having a plurality of seating grooves 33 formed in a tapered structure at a predetermined angle between the fixing part 32 and the guide hole 31 and the fixing part 32. .

The preload ring 50 is disposed at predetermined intervals in the seating groove 33, has at least one support part 34a, and forms at least two arrays of contacts on an outer circumferential surface of the elastic piece 24 so that the chuck body ( Pre-set preload is applied to the outer peripheral surface of the elastic piece 24 of 1).

The preload ring 50 includes at least one rubber ring. In addition, the preload ring 50 may be configured to include at least one metal ring.

The seating recess 33 includes a first seating recess P1 and a second seating recess P2 spaced apart from the first seating recess P1.

Preferably, the stud chuck 20 is pressurized when moving along the guide hole 31 of the chuck adapter 30, each of which is installed in the first seating groove P1 and the second seating groove P2. The inner circumferential surface of the preload ring 50 provides a predetermined pressure with respect to the outer circumferential surface of the elastic piece 24 of the stud chuck 20, wherein each of the preload rings 50 spaced at a predetermined interval is the elastic piece 24. Form at least two arrays of line contacts or partial surface contacts to the outer circumferential surface.

3A and 4A, the elastic piece 24 of the stud chuck 20 for sliding the inner circumferential surface of the chuck adapter 30 or the guide hole 31 is primarily installed in the first seating groove P1. The elastic pressure is received by the preload ring 50, and then the secondary elastic force is received by the preload ring installed in the second seating groove P2.

In this case, the primary preload and the secondary preload provide a constant elastic force with respect to the outer peripheral surface of the elastic piece 24 of the stud chuck to prevent the elastic piece flaring phenomenon and to fix the stud bolts S of various diameters. The fusion position of the stud bolt head is maintained in a positive alignment state by fixing a firm position inside the stud chuck 20.

Meanwhile, referring to FIG. 3B, the first seating groove P1 and the second seating groove P2 are formed at different taper angles, respectively.

In this case, the primary preload formed by the preload ring 50 installed in the first seating groove is relatively higher than the secondary preload formed by the preload ring 50 installed in the second seating groove P2. It can be formed less, the elastic force on the outer peripheral surface of the elastic piece 24 of the stud chuck 20 is subjected to the secondary preload in addition to the primary preload, which is fixed and fusion position for the stud bolt (S) It will be understood that it can be set depending on the preload section formed between the preload rings 50 inside the stud chuck 20.

For example, when the length and diameter of the stud bolts are relatively large, the stud bolts S may be configured so that the preload ring 50 installed in the second seating groove P2 acts as a secondary preload. It can be effective for the regular alignment of the fixed and fusion position.

Referring to FIG. 6, according to another embodiment of the disclosed invention, the preload ring 50 includes at least one stopper 51 raised from an inner circumferential surface.

The stopper 51 of the preload ring 50 serves to reduce the contact area with respect to the outer circumferential surface of the elastic piece 24 of the stud chuck 20 is advantageous to the sliding movement.

In some cases, the stopper 51 of the preload ring 50 may be assembled in a manner that is fitted to the slit groove 35, which can be adjusted so that the elasticity of the stud chuck 20 is not impaired. Should be.

Referring to FIG. 5, the stud welding gun according to the disclosed invention includes a plug 61 fixed to a cap 3c formed at a rear end of the gun body 3 and a screw pitch structure 62 on the plug 62. It is further configured to further include a push rod adjustment lever 60 having a variable rod 63 coupled to restrain the moving section of the push rod (7).

The variable rod 63 causes the variable rod end to be grounded on one side of the push rod 7 when the plug 61 rotates, for example, in a clockwise direction, and corresponds to a screw pitch section corresponding to the rotation. By pushing the push rod 7 toward the chuck adapter mounting portion (3b) to perform a function to move.

In the stud welding gun according to the disclosed embodiment as described above, the electricity is communicated through the push rod (7) to the stud bolt (S) charged to the stud chuck 20 by operating the switch 8 of the operator. Therefore, arc and fusion occurs between the stud bolt head and the base material, and arc welding to the walls of the hull or the panel of the automobile is the same as in the prior art, and thus a detailed description thereof will be omitted.

Herein, while the present invention has been described with reference to the preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be changed.

1, 20: Chuck
2a: guide passage
3: body
7: push rod
8: switch
30: Chuck Adapter
50: preload ring

Claims (5)

A gun body having a handle, a switch provided on one side of the handle, and a push rod for selectively connecting an arc current by the switch operation, the stud welding gun for arc welding a stud bolt,
It has a cylindrical chuck body, a bolt insertion hole formed at one end of the chuck body and a fixing portion formed at the other end and formed a plurality of elastic pieces by a plurality of slit grooves formed in the longitudinal direction of the chuck body Stud chuck;
A chuck having a guide hole for sliding the outer peripheral surface of the elastic piece of the chuck body, a fixing part for fixing to the gun body, and a plurality of seating grooves formed in a tapered structure at a predetermined angle between the guide hole and the fixing part. adapter;
And a preload ring disposed in the seating groove at predetermined intervals to form at least two arrays of contacts on the outer circumferential surface of the elastic piece.
The stud chuck is pressurized primarily when moving along the guide hole of the chuck adapter, and the second stud welding gun is pressurized at a predetermined pressure by the preload ring.
The method of claim 1,
The seating groove may include a first seating groove and a second seating groove spaced apart from the first seating groove, wherein the first seating groove and the second seating groove are each formed at different taper angles. key.
The method of claim 1,
The preload ring is configured to include at least one stopper raised from the inner circumferential surface stud welding gun.
The method according to claim 1 or 2,
And a push rod adjustment lever having a plug fixed to a cap formed at a rear end of the gun body and a variable rod coupled to the plug with a screw pitch structure to restrain the moving section of the push rod. Stud welding gun.
The method of claim 3,
The preload ring is stud welding gun, characterized in that it comprises at least one rubber ring.

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