WO2003039801A1 - Wire guide for welding and contact tip for welding - Google Patents

Abstract

A tubular wire guide for welding formed in a simple structure in a tip so that a wire does not come off a guide for guiding a welding wire and capable of stably feeding a current and a contact tip for welding; the wire guide for welding (3), comprising a cylindrical holding part (7) fitted to the inside wall of a cylindrical hole (4) at the rear end of a tip body (2) to hold the wire guide for welding, an inclined conical guide part (8) for guiding the wire for welding (W) passed therethrough while pressing against the inside wall of the cylindrical hole, and a connection part for connecting the holding part to the guide part and absorbing a pressure applied from the wire for welding thereto, wherein the tip outlet part of the guide part is provided deviately from the centerline (10) of the tip body to the inside wall so that the wire for welding presses against the inside wall of the cylindrical hole.

Description

 Welding wire guide and welding contact tip

 The present invention relates to a welding wire guide and a welding contact tip which are arranged in a welding contact light tip. Background art

 A contact tip for welding (hereinafter referred to as “contact tip” or “tip” as appropriate) placed in a conventional torch nozzle is a straight tip with a slightly larger inside diameter than the welding wire at the center of a single tip that has a screw for connection to the torch body. A hole is provided so that when the wire is sent out, the wire is brought into natural contact with the inner wall surface to supply power to the wire. However, in such a contact tip structure, the contact with the wire is a natural contact, so the contact resistance is large with respect to the supplied large power, and the contact state is unstable, so that the arc is kept stable for a long time. Is difficult. As a result, a large amount of sludge is generated and accumulates in the chip, causing a double arc and causing welding of the wire, which cannot be avoided. In addition, there was also a problem that the inner diameter of the through-hole was increased due to the wear of the inner wall of the through-hole due to the spark discharge, and the contact of the wire was increased. If the inner diameter increases and the wire touches, the so-called aim will occur, and defective welding products will be generated.

As a countermeasure, the welding wire is pressed against the inner wall of the chip with a pipe-to-plate spring to prevent power supply failure due to abrasion of the tip of the wire through hole and increase durability. For this reason, as shown in FIG. 5, in Japanese Patent Application Laid-Open No. 9-13646, a contact chip is divided into a chip body 31 of high-conductivity material, a high-hardness guide, and a chip cover for holding them. Power is supplied to the welding wire securely at the tip body, and the guide prevents the hole diameter from increasing at the tip. Is stopped. The welding wire S is guided to the tip body through the pipe 46 in the torch joint 40. The pipe 46 is rotated around the support head 45 by the tension of a tension wire disposed so as to cross the through hole 41 from the hole 67 of the torch joint 40, and the through hole 33 of the chip body is formed. As a result, the welding wire S and the chip body 31 can be reliably contacted. It has been proposed that the rotation angle of the pipe 46 can be adjusted by controlling the tension wire tension with an air cylinder or the like so that an appropriate contact state can be obtained.

Further, in Japanese Patent Application No. 2000-239, the through hole 23 penetrating from the rear end 21 b to the front end 21 a is formed in the chip body 21 as shown in FIG. Have.

 A leaf spring 22 is provided in the wire through hole 23, and the leaf spring 22 has a holding portion 22a and a spring portion 22b. The leaf spring 22 is housed in the rear end 21b of the wire through hole 23 so as to press the welding wire 25 passing through the wire through hole 23 from the center line h toward the inner wall side of the wire through hole 23. ing. It has been proposed that the spring portion 22 b has a groove 22 c for guiding a welding wire 25 penetrating the wire through hole 23. Disclosure of the invention

 However, in the contact type proposed in JP-A-9-1346, the chip is divided into a chip body 31, a high-hardness guide 35, and a chip cover 36 holding these. Further, it is composed of a nozzle 50 covering the chip body 31, a torch joint 40 and a holder.

In the contact tip, a rotatable pipe 46 for guiding the welding wire S and a tension wire arranged to traverse the tip body 31 are arranged. In order to press the wire against the inner wall of the chip, the pressure of the pipe pressed against the inner wall of the chip is adjusted by the tension of the tension wire, and the number of parts is large and the structure is complicated. Contact chips will be large. Therefore, there are many manufacturing processes and cost. Also, in Japanese Patent Application No. 2000-23991, the leaf spring 22 presses the welding wire 25 passing through the wire through hole 23 against the inner wall side of the wire through hole 23. The wire 20 is housed in the rear end 21b of the tip 20 of the wire through hole. In this structure, the leaf spring 22b is thinner than the diameter of the through hole of the chip, and the wire 25 is easily detached from the groove 22c provided in the spring 22b for guiding the wire 25. When the wire 25 comes off, the wire 25 is pinched between the left and right of the leaf spring 2 2b in the through hole 23 of the chip, and does not flow smoothly. Further, if the wire 25 is disengaged from the leaf spring 22 and the wire is sandwiched between the left and right sides of the leaf spring 22b in the chip, the plating film of the wire 25 is peeled off, which causes clogging of the hole. Then, the peeled film becomes a sludge and accumulates at the contact portion 23 d between the wire 25 and the inner wall of the chip, causing a double arc to cause wire welding.

 Therefore, in the present invention, a welding wire guide having a simple structure in which a cylindrical welding wire guide having a structure in which a wire does not come off in a cylindrical hole in a contact tip and capable of supplying a stable current is provided. The purpose is to provide contact tips.

 From the above, the present invention is used with a tip body in which a through hole through which a welding wire passes and a cylindrical hole are formed, and inserts the welding wire in a state of being fitted in the cylindrical hole. A welding wire guide for guiding while maintaining a contact state with respect to the cylinder, the cylinder being fitted to an inner wall of the cylindrical hole on the rear end side of the tip body to hold the welding wire guide. An inclined conical guide portion for guiding the welding wire passing through the inner wall of the cylindrical hole while pressing the welding wire through the holding portion, connecting the wire holding portion and the guide portion, A connection portion for buffering pressure from the welding wire, and a tip body formed so that the center of the outlet formed at the tip of the guide portion presses the welding wire against the inner wall of the cylindrical hole. From the center line of the inner wall It is intended to provide a welding Waiyagai de, characterized in that provided eccentrically.

The welding wire guide is made of elastic stainless steel (SAS 3 It is made of a metal material such as 0 4).

 The holding portion is formed in a cylindrical shape having a diameter larger than the diameter of the cylindrical hole to hold the welding wire guide by being inserted into the cylindrical hole, and a portion thereof is cut off and pressed to reduce the diameter. To change.

 Further, the guide portion is formed of a conical tube for guiding a welding wire passing therethrough, and a holding portion is provided via a connecting portion in a state where one side thereof is inclined so as to be parallel to the center line of the chip body. It is linked to The outlet provided at the end of the wire guide with a predetermined length is formed in a pipe shape with a predetermined diameter large enough for the welding wire to penetrate.

 In the second embodiment, a part of the conical cylinder is cut off from the wire guide portion to buffer pressure from the welding wire.

 Further, the present invention provides a tip body formed of a good conductive material and having a through hole through which a welding wire passes and a cylindrical hole, and the welding wire being fitted into the cylindrical hole, into the tip body. A welding contact tip comprising a welding wire guide for guiding while maintaining a contact state,

The tip body is provided at a rear end side, the inner wall of which is fitted with a holding portion of the welding wire guide for guiding the welding wire, the cylindrical hole holding the welding wire guide, and the cylindrical hole. A through hole having a diameter larger than the diameter of a welding wire penetrating from the conical inlet port connected to the tip end side of the hole to the tip of the tip body, and an arc portion at the rear end of the tip body. A screw, wherein the welding wire guide is fitted into an inner wall of the cylindrical hole at the rear end side of the tip body, and has a cylindrical holding portion for holding the welding wire guide; An inclined conical guide portion for guiding the welding wire while pressing it against the inner wall of the cylindrical hole, and a connection portion for connecting the wire holding portion and the guide portion to buffer the pressing force of the welding wire. And the guide A tip exit portion of the portion is provided eccentrically to the inner wall from the center line of the chip body so as to press the welding wire against the inner wall of the cylindrical hole. Is provided. Brief description of the drawings

 FIG. 1 shows a front view of a contact tip for welding according to the present invention.

 FIG. 2 is a cross-sectional view taken along AA of FIG. 1 showing a contact tip in a state where a welding wire W has penetrated.

 FIG. 3 shows a first embodiment, and (a) shows a front view of a welding wire guide. (B) is a cross-sectional view taken along line BB in (a).

 FIG. 4 shows a second embodiment, and (a) shows a front view of a welding wire guide. (B) is a cross-sectional view taken along line X-X in (a).

 FIG. 5 is a cross-sectional view illustrating a conventional example.

 FIG. 6 is a cross-sectional view illustrating a conventional example. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a front view of a welding contact tip 1 of the present invention. The welding contact tip 1 is formed with an attachment screw 6 for attaching to the tip body 2 and the torch side. The chip body 2 is formed of brass, pure copper, zirconium, brass, aluminum aluminum, phosphor bronze, conductive ceramic, beryllium copper, and the like, in addition to chromium copper, which is a good conductive material. The welding wire W penetrates from the rear end 2b side of the welding contact tip 1 to the front end 2a. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 in a state where the welding wire W has penetrated the inside of the contact tip 1. As shown in the figure, the contact tip 1 is composed of a chip body 2 and a tubular welding wire guide 3. The tip main body 2 has a cylindrical hole 4 through which a welding wire is passed from substantially the middle to the rear end between the front end and the rear end. The welding wire guide 3 is installed in the cylindrical hole 4. The distal end side of the cylindrical hole 4 forms a conical cone portion 4a. A through hole 5 having an inner diameter slightly larger than the diameter of the welding wire W is formed from the inlet on the tip side of the cone portion 4a to the tip end. This The conical cone portion 4a can easily guide the welding wire W to be inserted into the through hole 5. Furthermore, the resistance of the contact surface between the welding wire W and the power supply section 4b of the tip body 2 is stabilized.

 Here, a first embodiment of the welding wire guide 3 according to the present invention will be described.

 FIG. 3 shows a cylindrical welding wire guide 3, and (a) shows a front view of the welding wire guide 3. (B) is a cross-sectional view taken along line B-B in (a). The cylindrical welding wire guide 3 includes a holding portion 7, a guide portion 8, and a connection portion 12 connecting the holding portion 7 and the guide portion 8. The tubular welding wire guide 3 is usually made of elastic metal, but may be made of a material other than metal (for example, hard rubber or the like) as long as it has elasticity.

 The holding portion 7 is cylindrical and has a shape that fits into the cylindrical hole 4 at the rear end of the chip body 2. One part of the cylinder of the holding part 7 is cut off, and the diameter thereof is larger than the diameter of the cylindrical hole 4. At the time of fitting, press the holding portion 7 and insert it into the cylindrical hole 4 so that the cut-off portion 7b contacts. The stainless steel material of the holding part 7 is restored. The restoring force becomes a pressing force, and the holding part 7 is pressed against the inner wall of the cylindrical hole 4 at the rear end inside the chip to hold the welding wire guide 3.

 The guide part 8 is formed in a conical shape. The guide portion 8 is connected to the connecting portion 12 by being inclined such that one side of the conical shape is parallel to the center line 10 of the chip. The welding wire outlet 9 formed at the tip of the guide portion 8 is eccentric from the center line 10 of the tip body 2 toward the inner wall. The welding wire W is pressed against the inner wall by the welding wire outlet 9.

The welding wire outlet portion 9 at the tip of the guide portion 8 in the first embodiment is formed in a pipe shape having a diameter at the leading end so as to allow a welding wire W to pass therethrough by a predetermined length. I have. The diameter of the outlet portion 9 formed in a pipe shape is formed to a predetermined size depending on conditions such as the diameter of the welding wire W. The present welding wire can be applied to various sizes, but as an example, when the diameter of the welding wire is 1.0 mm, the inner diameter of the outlet portion 9 is 1.3 mm. At the welding wire outlet 9 on the tip side of the guide portion 8, the welding wire W and the wire outlet 9 of the guide portion 8 are in surface contact. The constant contact resistance between the welding wire and the wire outlet 9 of the guide due to surface contact suppresses fluctuations in the applied voltage. Because the welding arc is controlled by constant current, the current is stable and a good arc can be obtained. Further, the surface of the welding wire W is provided with plating. For example, copper or aluminum plating. If the wire and the guide come off from the wire guide and are rubbed in the cylinder, the plating may be scraped off. The shaved film or the like closes the through hole 5 or adheres to the power supply portion 4b and the like, causing a double arc and causing a trap in which the welding wire W is welded. Since the welding wire guide 3 of the present invention is formed in a tubular shape, the welding wire W does not come off the guide portion 8. The welding wire can be guided in a stable state.

 In addition, the connecting portion 12 has a function of buffering an impact given to the guide portion 8 by the penetrating welding wire W. Stabilizes the frictional resistance to the guide part 8 and makes it usable for a long time.

 Here, the operation of the welding wire W and the welding contact tip 1 will be described.

 The welding contact tip 1 is arranged inside the torch nozzle, attached to the welding wire feeder, and used by inserting the welding wire W into the cylindrical hole 4. The welding wire W inserted into the cylindrical hole 4 is guided into the cylindrical welding wire guide 3 and passes through the holding portion 7. The welding wire W is guided from the holding portion 7 to the guide portion 8, and is guided to the inner wall of the tip body 2 by pressing the welding wire outlet portion 9 of the guide portion 8. The welding wire W coming out of the welding wire outlet portion 9 advances from the cone portion 4a to the through hole 5 while contacting the power supply portion 4b on the inner wall of the chip body 2. At this time, the welding wire W is supplied with power and is melted by an arc with respect to the workpiece to be welded.

Since the welding wire guide 3 is cylindrical, the welding wire does not come off from the welding wire guide 3. It does not come off the guide part 8 or be caught by the welding wire guide 3 in the cylindrical hole 4. Always stable welding wire W can be guided.

 Furthermore, since the guide presses the welding wire W near the tip of the tip, the pressing can be performed for a long time even if the power supply section 4 d is worn. By being able to press for a long time, a stable current can be supplied and power can be saved.

 Next, a second embodiment of the welding wire guide 3 will be described. FIG. 4 shows a tubular welding wire guide 3, and (a) shows a front view of the guide member. (B) is a cross-sectional view taken along line X-X of (a). The tubular welding wire guide 3 includes a holding portion 7, a guide portion 8, and a connection portion 12 connecting the holding portion and the guide portion. The tubular welding wire guide 3 is formed of an elastic stainless steel (SAS304) material, an aluminum material, or the like.

 The holding part 円 筒 has a cylindrical shape and fits into the cylindrical hole 4 at the rear end of the chip. One part of the cylinder of the holding part 7 is cut off, and the diameter thereof is larger than the diameter of the cylindrical hole 4. When fitting, press down the holding part 7 and insert it into the cylindrical hole 4 so that the separation part 7b contacts. The pressing force due to the restoring force by which the stainless steel material of the holding part 7 is restored presses the holding part 7 against the inner wall of the cylindrical hole 4 at the rear end inside the chip to hold the welding wire guide 3.

 The guide portion 8 has a conical shape. And the cylindrical part of the guide part 8 is cut off. The shock given to the guide portion 8 by the welding wire W can be buffered. The center of the welding wire outlet formed at the end of the guide portion 8 is eccentric from the center line 10 of the tip body 2 toward the inner wall. The welding wire W is pressed against the inner wall by the welding wire outlet 8b.

 Here, the operation of the welding wire W and the welding contact tip 1 in the second embodiment will be described.

The welding contact tip 1 is arranged inside the torch nozzle, attached to the welding wire feeder, and used by inserting the welding wire W into the cylindrical hole 4. The welding wire W inserted into the cylindrical hole 4 is guided into the cylindrical welding wire guide 3 and passes through the holding portion 7. It is guided from the holding portion 7 to the guide portion 8, and is guided toward the inner wall of the tip body 2 by pressing the welding wire outlet 8 b of the guide portion 8. The diameter of the welding wire outlet 8b is set so that the wire can be easily transported. It is formed with a margin. The welding wire W coming out of the welding wire outlet 8 b to the inner wall side of the chip body 21 is guided by the conical cone portion 4 a provided at the tip side of the cylindrical hole 4, and the power feeding portion of the inner wall of the chip body 2 4 Proceed to through hole 5 while contacting b. At this time, the welding wire W is supplied with power and is melted by the arc to perform welding.

 The welding wire guide 3 has a conical shape, and the welding wire W is wrapped in the guide portion 8 so that it does not come off from the welding wire guide 3. It does not get caught in the welding guide 1 in the cylindrical hole 4. The welding wire W can always be guided stably.

 Further, since the guide portion 8 presses the welding wire W near the tip of the tip, the pressing can be performed for a long time even if the power supply portion 4 d is worn. By being able to press for a long time, a stable current can be supplied and power can be saved.

 The present invention has a cylindrical structure in which the welding wire W penetrating through the inside of the welding contact tip 1 does not come off from the welding wire guide 3 installed in the chip body 2, and has a small and simple structure. In addition, a welding wire guide and a welding contact tip that can supply a stable current can be provided.

 Furthermore, since the guide presses the welding wire W near the tip of the tip, the pressing can be performed for a long time even if the power supply section 4 d is worn. By being able to press for a long time, a stable current can be supplied and power can be saved. Further, the durability of the chip body has been further increased. Industrial applicability

 INDUSTRIAL APPLICABILITY The present invention can be used as a welding wire guide and a welding contact tip arranged in a welding contact tip capable of supplying power stably with a simple structure.

Claims

The scope of the claims 1. Used together with a tip body in which a through hole through which a welding wire passes and a cylindrical hole are formed, and the welding wire is brought into contact with the tip body in a state of being fitted into the cylindrical hole. A welding wire guide for guiding while maintaining  A cylindrical holding portion for holding the welding wire guide by fitting to an inner wall of the cylindrical hole on the rear end side of the tip body;  An inclined conical guide portion for guiding the welding wire passing therethrough while pressing the welding wire against the inner wall of the cylindrical hole;  A connection part that connects the wire holding part and the guide part and buffers the pressure from the welding wire; Consists of  The center of the outlet portion formed at the tip of the guide portion is provided eccentrically to the inner wall from the center line of the tip body so as to press the welding wire against the inner wall of the cylindrical hole. Characteristic welding wire guide. 2. The welding wire guide according to claim 1, wherein the welding wire guide is formed of an elastic member containing nonmetals.  3. The welding wire guide according to claim 2, wherein the holding portion is formed in a cylindrical shape having a diameter larger than a diameter of the cylindrical hole, and a part thereof is cut and pressed to change its diameter. De.  4. The guide section is formed of a conical cylinder that guides the welding wire passing therethrough, and is held via the connection section in a state where one side thereof is inclined so as to be parallel to the center line of the chip body. 3. The welding wire guide according to claim 2, wherein the welding wire guide is connected to a portion.  5. The outlet part provided at a predetermined length at the tip of the wire guide part is formed in a pipe shape with a predetermined diameter large enough for a welding wire to pass therethrough. The described welding wire guide. 6. The wire guide has a conical shape to buffer the pressure from the welding wire. 5. The welding wire guide according to claim 4, wherein a part of the cylindrical shape is cut off.  7. A chip body formed of a good conductive material and having a through hole through which a welding wire passes and a cylindrical hole, and the welding wire with the cylindrical body fitted in the cylindrical hole. And a welding guide for guiding while maintaining the contact state by welding.  The chip body,  A cylindrical hole that is provided on a rear end side and fits with a holding portion of the welding wire guide that guides the welding wire and that holds the welding wire guide;  The through hole having a diameter larger than the diameter of a welding wire penetrating from the conical inlet port connected to the tip side of the cylindrical hole to the tip of the chip body;  A screw for coupling to the arc portion at the rear end of the tip body, wherein the welding wire guide comprises:  A cylindrical holding portion for holding the welding wire guide by fitting to the inner wall of the cylindrical hole on the rear end side of the tip body;  A guide part having a conical shape inclined so that one side thereof is parallel to a center line of the chip main body for guiding the welding wire penetrating the inner wall of the cylindrical hole while pressing the welding wire against the inner wall;  A connection part that connects the wire holding part and the guide part and buffers the pressing force of the welding wire,  The center of the tip outlet portion of the guide portion is eccentrically provided on the inner wall from the center line of the tip body so as to press the welding wire against the inner wall of the cylindrical hole. Contact tip.