Electrified component, welding torch, welding system, method for designing electrified component, and contact chip

Abstract

To provide a current-carrying component which can extend a product life of a contact tip while stabilizing power supply to a welding wire with a simple and contact structure, and to provide a welding torch including the current-carrying component, a welding system including the current-carrying component, a design method of the current-carrying component, and the contact tip.SOLUTION: A welding torch for supplying electric power to a welding wire to perform arc welding has a current-carrying component. The current-carrying component includes, at least, a cylindrical contact tip which supplies electric power to the welding wire, and a cylindrical tip body which connects a torch barrel at the welding torch base end side with the contact tip. The tip body has: an eccentric guide part having a first inner diameter; and a wire pressing part which causes the welding wire inserted into the eccentric guide part to be eccentric in a radial direction. The contact tip is provided with an axial guide hole which guides the welding wire to an opening formed at a tip. The guide hole has a second inner diameter smaller than the first inner diameter.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to an energizing component having a mechanism for forcibly contacting a welding wire, a welding torch having the energizing component, a welding system having the energizing component, a design method of the energizing component, and a contact tip.

Background Art

[0002] Conventionally, a contact tip has functioned as an energizing component that guides a welding wire toward a welding location and supplies power to the welding wire. A welding torch equipped with a contact tip can arc-weld a welding location by feeding out a welding wire from an opening formed on the tip side of the contact tip toward the welding location and supplying power to the welding wire that has come into contact with the contact tip.

[0003] Since the welding wire to be fed is generally used in the form of spool winding or pack winding via the contact tip, it generally has a bending habit. Due to this bending habit, the welding wire contacts the contact tip side, and this contact position becomes the power supply part. Since the force with which the welding wire and the contact tip come into contact depends on the bending habit, it varies depending on conditions such as the rigidity of the welding wire, the form of spool winding or pack winding. For example, when used in the form of pack winding, the bending habit of the wire becomes smaller, so the contact force between the welding wire and the contact tip becomes smaller. When this contact force is small, if the opening of the contact tip becomes even slightly larger due to tip wear, it becomes difficult for the welding wire and the contact tip to come into contact, and problems such as tip fusion due to a sharp increase in the electrical resistance of the power supply part and arc instability due to poor power conduction in the power supply part are likely to occur. Therefore, depending on the rigidity and winding method of the welding wire, it becomes necessary to replace the contact tip early due to the influence of the contact force. Thus, in order to extend the life of the contact tip and perform stable welding regardless of the rigidity and winding method of the welding wire, it is necessary to keep the contact force between the welding wire and the contact tip constant using some pressing means.

[0004] On the other hand, Patent Document 1 discloses a configuration in which pressing means for pressing a welding wire against a chip contact surface is provided inside a contact chip, and the pressing force is used to forcibly bring the welding wire into contact with the energization surface of the contact chip.

[0005] Further, Patent Document 2 discloses a configuration in which an axial torch body through which a welding wire is inserted, a power supply member extending to the axial tip side of the torch body, and pressing means for pressing the torch body in a direction orthogonal to the axial direction are provided, and by moving the entire torch body by the pressing means, the welding wire fed out from the torch body is pressed against the power supply member side.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] The contact chip described in Patent Document 1 can press the welding wire against the contact surface of the contact chip with a constant contact force by the pressing means even if the opening becomes slightly larger due to the welding operation. Therefore, power supply to the welding wire is stable and the product life is improved. However, since the structure of the contact chip, which is a consumable with a relatively short product life, becomes complicated, the manufacturing cost increases and the cost-effectiveness is not sufficient.

[0008] Also, the welding torch described in Patent Document 2 can improve the product life of the contact chip without complicating the configuration of the contact chip. However, since it is necessary to provide pressing means for moving the entire torch body, there is a problem that the entire apparatus becomes larger and more complicated, and maintenance is also time-consuming.

[0009] The present invention has been made in view of the above situation, and its object is to provide an energizing component that can extend the product life of a contact chip while stabilizing the power supply to a welding wire with a simple and compact configuration without providing pressing means in the contact chip, a welding torch provided with the energizing component, a welding system provided with the energizing component, a design method for the energizing component, and a contact chip.

Means for Solving the Problems

[0010] The above object of the present invention is achieved by the following configuration. (1) An energizing component included in a welding torch for supplying power to a welding wire and performing arc welding, The energizing component includes at least a contact chip for supplying power to the welding wire, and a chip body that connects the torch barrel on the proximal end side of the welding torch and the contact chip. The chip body has an eccentric guide portion having a first inner diameter, and a wire pressing portion that eccentrically moves the welding wire inserted through the eccentric guide portion in the radial direction. The contact chip is provided with a guide hole that is formed along the axial direction from a tip opening formed at the tip to a rear end opening and guides the welding wire. The guide hole has a second inner diameter that is smaller than the first inner diameter. Energizing component. (2) The chip body is provided with a proximal end guide portion having a third inner diameter on the proximal end side of the eccentric guide portion. The third inner diameter is smaller than the first inner diameter and larger than the second inner diameter. The energizing component according to (1). (3) The wire pressing portion includes at least a pressing member that contacts the welding wire, and an elastic member for pressing the pressing member against the welding wire. The pressing member is a spherical member. The elastic member is a leaf spring-like member. The energizing component according to (1). (4) In the wire pressing portion, the spherical member is accommodated in a radial through hole formed on the circumferential surface of the chip body, the leaf spring-like member clamps the circumferential surface of the chip body so as to press the spherical member protruding from the through hole, The electrical conduction component according to (3). (5) The proximal end guide portion has the third inner diameter according to the inner diameter of a conduit tube inserted into the rear portion side of the chip body. The electrical conduction component according to (2). (6) An adjustment mechanism adjustable in position with respect to the longitudinal direction or the circumferential direction of the chip body is provided in the wire pressing portion. The electrical conduction component according to any one of (1) to (5). (7) A welding torch including the electrical conduction component according to any one of (1) to (5). (8) A welding robot including the welding torch according to (7), and a welding power source. A welding system. (9) A method for designing the electrical conduction component according to (2), at least a first bending section between the tip position of the proximal end guide portion and the pressing position of the welding wire by the wire pressing portion, a second bending section between the pressing position of the welding wire by the wire pressing portion and the rear end opening of the guide hole, a tip guide length which is the axial length of the guide hole, the first inner diameter, the second inner diameter, the third inner diameter, welding wire information regarding the welding wire used for welding, a contact force calculation step of calculating a contact force between the vicinity of the tip position of the contact tip and the welding wire based on the electrical conduction component design items composed of a design step of determining the values of the electrical conduction component design items so that the contact force calculated in the contact force calculation step becomes a preset design contact force. A method for designing an electrical conduction component. (10) The welding wire information includes at least one of the wire diameter of the welding wire and the mechanical properties of the welding wire. The method for designing an energizing component according to (9). (11) A contact tip used for a welding torch that supplies power to a welding wire and performs arc welding, The inner surface of the contact tip, A cylindrical connecting portion disposed at the rear end and connected to the axial tip of the chip body, A tapered portion whose diameter decreases toward the front side in the axial direction from the connecting portion, A guide hole formed along the axial direction from the rear end opening communicating with the tip of the tapered portion to the tip opening formed at the tip of the contact tip, for guiding the welding wire, and having, The second inner diameter forming the guide hole is larger than the linearity of the welding wire, while being smaller than the first inner diameter of the pressing space in which the welding wire is pressed in the radial direction by the eccentric guide portion of the chip body. The guide hole contacts the welding wire at the rear end opening and the tip opening. Contact tip.

Advantages of the Invention

[0011] According to the present invention, by arranging a wire pressing portion that stabilizes power supply to the welding wire by utilizing the reaction force of the bending rigidity of the welding wire on the chip body, the entire welding torch can be configured compactly, and the configuration of the contact tip with a high replacement frequency can be simplified, so that the cost can be kept low.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiment for Carrying Out the Invention

[0013] Hereinafter, with reference to the accompanying drawings, the configuration of a welding torch provided with an energized component according to the present invention will be described. Note that each drawing is created for the purpose of explaining the present invention, and the embodiments of the present invention are not limited to the illustrated contents.

[0014] First, in order to grasp the overall image of the welding torch of the present embodiment, a welding system 1 using the welding torch will be described.

[0015] As shown in FIG. 1, the welding system 1 includes a wire pack 2, a welding power source 5, and a welding robot 7. The welding robot 7 has a torch cable 3, a wire feeding device 4, a manipulator 6, and a welding torch 10. Note that the symbol A in FIG. 1 is a base material to be welded.

[0016] As shown in FIG. 1, the wire pack 2 is a supply source of the welding wire W, and a predetermined amount of the welding wire W is stored in a packed form. As the welding wire W, for example, a copper-plated wire, a non-copper-plated wire, or the like can be used. Further, the welding wire W has a bending habit of being bent by being stored in the wire pack 2.

[0017] The torch cable 3 supplies the welding current supplied from the welding power source 5, the welding wire W stored in the wire pack 2, and the shielding gas supplied from a shielding gas storage device (not shown) to the welding torch 10. One end of the torch cable 3 is connected to the wire feeding device 4, and the other end is connected to the welding torch 10.

[0018] The wire feeding device 4 feeds the welding wire W to the welding torch 10 by paying it out with a roller or the like via the torch cable 3. By providing this wire feeding device 4, the welding wire W is automatically supplied to the welding torch 10.

[0019] The welding power source 5 is a supply source of welding current, and supplies welding current to the welding torch 10 via the wire feeding device 4 and the torch cable 3.

[0020] The manipulator 6 is an articulated robot with a welding torch 10 attached to its tip, and its operation is controlled by a robot control device (not shown).

[0021] FIG. 2 is a side view showing the welding torch according to the embodiment. The welding torch 10 includes a torch body 11, a nozzle 12, and an energizing component 20, and performs gas shielded arc welding.

[0022] The torch body 11 is a cylindrical member made of metal, and the energizing component 20 and the nozzle 12 are detachably attached to the tip side. On the tip side of the torch body 11, a female screw portion (not shown) to which the energizing component 20 is attached and a socket nut 14 to which the nozzle 12 is attached are provided.

[0023] Further, the torch body 11 includes a conduit tube 13 for guiding the welding wire W. This conduit tube 13 is provided so as to protrude from the tip of the torch body 11, and the protruding portion is inserted into a chip body 30 that constitutes the energizing component 20.

[0024] Further, the torch body 11 supplies the welding wire W, the welding current supplied from the welding power source 5, and the shielding gas supplied from a shielding gas storage device (not shown) toward the energizing component 20.

[0025] The nozzle 12 is a cylindrical member with open front and rear ends, and houses an energizing component 20 provided on the tip side of the torch body 11 and an orifice (not shown) externally inserted into the energizing component 20. Shielding gas ejected from the circumferential surface of the energizing component 20 and rectified by the orifice is supplied from the open portion at the tip of the nozzle 12.

[0026] Next, based on FIGS. 3 to 6, the configuration of the energizing component will be described. FIG. 3 is a perspective view showing the energizing component, FIG. 4 is an exploded perspective view showing the energizing component, FIG. 5 is a central cross-sectional view showing the energizing component, and FIG. 6 is a cross-sectional view showing the wire pressing portion.

[0027] The energizing component 20 includes a chip body 30 attached to the tip side of the torch body 11 and a contact chip 40 attached to the tip of the chip body 30.

[0028] The chip body 30 is a cylindrical member extending in the axial direction, and guides the welding wire W supplied from the rear torch body 11 side toward the front contact chip 40. The chip body 30 is formed of a metal material having electrical conductivity such as copper.

[0029] The chip body 30 includes a wire pressing portion 33 that eccentrically positions the inserted welding wire W, an eccentric guide portion 31 that forms a cylindrical space (hereinafter referred to as a pressing space) in which the welding wire W is eccentric, and a base end guide portion 32 that forms a cylindrical space disposed on the rear side of the eccentric guide portion 31. This configuration can be referred to with reference to FIG. 5.

[0030] On the outer peripheral surface of the chip body 30, a male screw portion 34 for attaching the contact chip 40 is formed on the front end side, and a male screw portion 35 for attaching to the tip side of the torch body 11 is formed on the rear end side.

[0031] On the inner peripheral surface of the chip body 30, a pressing space is formed by an eccentric guide portion 31. The eccentric guide portion 31 is disposed in the front-end side half portion of the chip body 30, and a wire pressing portion 33 is provided at a midway portion in the axial direction. The pressing space within the eccentric guide portion 31 has a pre-designed first inner diameter R1.

[0032] The wire pressing portion 33 includes a spherical pressing member 36 that presses the welding wire W inserted through the eccentric guide portion 31, a biasing member 37 that biases the pressing member 36 radially outward, a holding portion 38 provided on the chip body 30 so as to hold the pressing member 36 and the biasing member 37, and a cover body 39 that covers the pressing member 36 and the biasing member 37 along the outer peripheral surface of the chip body 30. This configuration may be referred to with reference to FIGS. 4 and 5.

[0033] As shown in FIGS. 4 to 6, the holding portion 38 has a groove portion 38A recessed in the entire circumferential direction on the outer surface of the eccentric guide portion 31, a pair of notch surfaces 38B, 38B formed at positions symmetric to the cylindrical bottom surface of the groove portion 38A by 180°, and a through hole 38C that penetrates radially between one notch surface 38B and the pressing space. The diameter of the through hole 38C is slightly larger than the width direction of the notch surface 38B. This configuration may be referred to with reference to FIG. 4.

[0034] The pressing member 36 is a steel ball that is fitted and housed in the through hole 38C and is held so as to be movable radially along the through hole 38C. The diameter of the pressing member 36 is larger than the first inner diameter R1 of the eccentric guide portion 31 and smaller than the outer diameter of the eccentric guide portion 31. Therefore, it is possible to prevent the steel ball, which is the pressing member 36, from entering the eccentric guide portion 31.

[0035] The biasing member 37 is a leaf spring formed in a C shape along the groove portion 38A, and has a pair of clamping portions 37B and 37C that clamp a pair of notch surfaces 38B and 38B, and a connecting portion 37A that extends in an arc shape along the groove portion 38A and connects the pair of clamping portions 37B and 37C. Note that, as an example of the leaf spring formed in a C shape, a rod clamp can be mentioned. One clamping portion 37C is bent inward so as to press the spherical pressing member 36 in the direction of pushing it into the through hole 38C. The other clamping portion 37B has a contact surface 37B1 that contacts the entire width direction of the notch surface 38B, and a locking portion 37B2 that is bent with respect to the contact surface 37B1 so that the end portion of the clamping portion 37B is along the groove portion 38A. This configuration can be referred to with reference to FIG. 6.

[0036] The cover body 39 is a cylindrical member whose axial direction is formed longer than the groove portion 38A and is attached so as to cover the groove portion 38A. By covering the outer peripheral side of the groove portion 38A in which the pressing member 36 and the biasing member 37 are set by the cover body 39, it is possible to surely prevent the pressing member 36 from coming off from the through hole 38C during the welding operation.

[0037] The cover body 39 is formed of a thin plate spring-like member, and before elastic deformation, its inner diameter is formed smaller than the outer diameter of the tip body 30. Thereby, by elastically deforming the cover body 39 in the diameter-expanding direction, the cover body 39 can be easily attached to a predetermined position covering the groove portion 38A. Further, since the cover body 39 can be formed of a thin member, the radial direction of the tip body 30 can be formed compactly.

[0038] The base end guide portion 32 is disposed in the rear half portion of the tip body 30, and its inner peripheral surface is constituted by the tip end portion of the conduit tube 13 inserted into the torch gun body 11. Specifically, inside the base end guide portion 32 of the tip body 30, the tip end of the conduit tube 13 extending from the torch gun body 11 is abutted against a step 31a provided at the rear end of the pressing space and accommodated therein. And the inner diameter of the conduit tube 13 defines the third inner diameter of the base end guide portion 32. As shown in FIG. 5, the third inner diameter R3 is smaller than the first inner diameter R1.

[0039] The contact chip 40 is a cylindrical member extending in the axial direction, and the front half portion thereof is formed in a frustum shape with a diameter decreasing toward the tip. At the tip of the contact chip 40, a tip opening 42a from which the welding wire W is fed out is formed. The contact chip 40 is formed of a metal material having electrical conductivity such as copper, and supplies a welding current to the welding wire W.

[0040] The inner surface of the contact chip 40 has a cylindrical connecting portion 44 formed with an internal thread portion 44a disposed at the rear end and fastened to the male thread portion 34 at the axial tip of the chip body 30, a tapered portion 43 whose diameter decreases axially forward from the front end of the connecting portion 44, and a guide hole 42 formed axially along from the rear end opening 42b communicating with the tip of the tapered portion 43 to the tip opening 42a for guiding the welding wire W.

[0041] The guide hole 42 is formed along the central axis of the electrical component 20, and has a tip guide length T which is the axial length from the tip opening 42a to the rear end opening 42b, and a second inner diameter R2. The second inner diameter R2 is smaller in diameter than the first inner diameter R1 and the third inner diameter R3, and larger than the wire diameter of the welding wire W.

[0042] The tip guide length T and the second inner diameter R2 are set such that the welding wire W eccentric from the central axis of the electrical component 20 by the wire pressing portion 33 can be brought into contact with the rear end opening 42b and the tip opening 42a at the front and rear ends of the guide hole 42. This configuration can be referred to in FIG. 5. Specifically, it is desirable that the second inner diameter is 1.05 to 1.35 times the wire diameter of the welding wire W.

[0043] The connecting portion 44 is formed with an internal thread portion 44a for connecting to the tip side of the chip body 30 on the rear end side. Thereby, the connecting portion 44 is formed in a cylindrical shape having an inner diameter approximately equal to or larger than the first inner diameter R1 from the rear end side to the front end side communicating with the tapered portion 43.

[0044] The tapered portion 43 is formed such that the diameter gradually decreases from the rear end toward the front end. In the illustrated example, the rear end of the tapered portion 43 communicates with the front end side of the connecting portion 44 having a diameter larger than the first inner diameter R1, and the front end of the tapered portion 43 communicates with the rear end opening 42b of the guide hole 42 having the second inner diameter R2.

[0045] The tapered portion 43 and the connecting portion 44 only need to be configured such that the welding wire W bent by the wire pressing portion 33 does not contact the energizing component 20 side between the pressing position of the welding wire W by the pressing member 36 and the rear end opening 42b of the guide hole 42, and the shape is not limited to the above shape.

[0046] According to the above configuration, the first inner diameter R1, the second inner diameter R2, and the third inner diameter R3 of the energizing component 20 are arranged coaxially, the second inner diameter R2 is the smallest, and the first inner diameter R1 is the largest. Also, the front end opening 42a and the rear end opening 42b have substantially the same size as the second inner diameter R2.

[0047] Hereinafter, the operation and effects of the above-described energizing component 20 will be described. The welding wire W supplied from the torch body 11 to the energizing component 20 contacts the energizing component 20 side at the third contact position X3 at the tip position of the proximal end guide portion 32 (consit tube 13) having the third inner diameter R3, the first contact position X1 pressed by the pressing member 36 within the eccentric guide portion 31 having the first inner diameter R1, the second contact position X2 near the rear end opening 42b of the guide hole 42, and the tip contact position X0 near the front end opening 42a of the guide hole 42, due to being eccentric by the wire pressing portion 33.

[0048] Therefore, as shown in Fig. 5, the welding wire W guided to the chip body 30 side within the welding torch 10 is greatly eccentric radially outward in the first bending section L1 by the wire pressing portion 33 and is pressed so that the amount of bending becomes smaller in the second bending section L2. Further, the welding wire W is guided so as to contact both the second contact position X2 and the tip contact position X0 in the section of the tip guide length T by the guide hole 42. At this time, in the axial direction of the energizing component 20, the section between the third contact position X3 and the first contact position X1 is defined as the first bending section L1, and the section between the first contact position X1 and the second contact position X2 is defined as the second bending section L2.

[0049] According to the above, regardless of the presence or absence of a bend in the welding wire W, the welding wire W can be forcibly brought into contact with the vicinity of the tip position of the contact tip 40 with a predetermined contact force. In other words, power can be forcibly supplied to the welding wire W. As a result, even when the tip opening 2a of the contact tip 40 is widened by the welding operation, power supply to the welding wire W can be maintained, so that the life of the contact tip 40 can be extended.

[0050] Note that each inner diameter of the inner periphery of the energizing component 20 in the present embodiment is set such that the first inner diameter R1 > the third inner diameter R3 > the second inner diameter R2, but a configuration having only the first inner diameter R1 > the second inner diameter R2 may be employed. In this case, the third inner diameter R3, which is the inner diameter of the conduit 13, has the same dimension as the first inner diameter R1 of the pressing space.

[0051] In addition, by disposing the wire pressing portion 33 for eccentrically displacing the welding wire W on the chip body 30 side, the contact tip 40, which has a higher replacement frequency compared to the chip body 30, can be configured simply. Therefore, the manufacturing cost and maintenance cost of the entire energizing component 20 can be suppressed.

[0052] Further, since the wire pressing portion 33 employs a spherical pressing member 36, the pressing member 36 for eccentrically displacing the welding wire W makes point contact with the welding wire W being fed, and by rotating, the frictional force in the feeding direction can be reduced, so that it is possible to prevent the supply resistance of the welding wire W from increasing more than necessary.

[0053] Next, a design method for the energizing component 20 will be described. The design method for the energizing component 20 provided with the wire pressing portion 33 has a contact force calculation step and a design step.

[0054] In the contact force calculation step, based on information regarding various design items, the contact force at which the welding wire W contacts near the tip of the contact chip 40, specifically, at the second contact position X2, is calculated. As the design items, at least the first bending section L1, the second bending section L2, the tip guide length T, the first inner diameter R1, the second inner diameter R2, the third inner diameter R3, and information regarding the welding wire W are used.

[0055] The information regarding the welding wire W includes at least one of the wire diameter of the welding wire W, information regarding the mechanical properties of the welding wire W, and information regarding the bending habit of the welding wire W. The information regarding the mechanical properties of the welding wire W is information regarding rigidity and the like, and uses Young's modulus and Poisson's ratio. As other design items described above, the pressing force of the welding wire W by the wire pressing portion 33 or the eccentricity of the welding wire W by the wire pressing portion 33 may be added.

[0056] The contact force of the welding wire W near the tip of the contact chip 40 becomes stronger as the first bending section L1 and the second bending section L2 are shorter, and becomes stronger as the difference between the first inner diameter R1 and the third inner diameter R3 and the difference between the first inner diameter R1 and the second inner diameter R2 are larger, and becomes stronger as the rigidity of the welding wire W is higher.

[0057] In the design step, the values of each design item are determined when the contact force calculated in the contact force calculation step becomes an arbitrarily predetermined contact force. Note that each design item is preferably designed such that the design contact force at which the welding wire W contacts the second contact position X2 on the contact chip 40 side is in the range of 1 N to 15 N.

[0058] According to the above design method, the current-carrying component 20 with which the welding wire W contacts near the tip position of the contact chip 40 with an appropriate contact force can be designed for each type of welding wire W or for each welding wire W having different bending habits depending on the accommodation method.

[0059] Next, based on FIG. 7, another embodiment of the wire pressing portion will be described. FIG. 7 is a central cross-sectional view showing the current-carrying component of the other embodiment. The wire pressing portion 50 includes a pressing bolt 51 used as a pressing member, a through hole 53 which is a screw hole penetrating in the radial direction from the peripheral surface of the eccentric guide portion 31 to the pressing space, and adjustment mechanisms 53A1, 53A2, 53B1, 53B2 for making it possible to adjust the pressing position of the welding wire W by the pressing bolt 51 in the axial direction and the circumferential direction.

[0060] By being fastened to the through hole 53, the pressing bolt 51 can press the welding wire W inserted into the eccentric guide portion 31 radially outward. The pressing bolt 51 can continuously adjust the length by which the shaft portion of the pressing bolt 51 projects into the eccentric guide portion 31 by adjusting the tightening amount to the through hole 53.

[0061] As shown in FIG. 7, the adjustment mechanisms 53A1, 53A2, 53B1, 53B2 are configured by arranging a plurality of the through holes 53 side by side in the axial direction and the circumferential direction of the eccentric guide portion 31. Specifically, the adjustment mechanisms 53A1, 53A2, 53B1, 53B2 include a first front through hole 53A1 arranged side by side along the axial direction of the eccentric guide portion 31, a first rear through hole 53A2, a second front through hole 53B1 arranged side by side in the circumferential direction of the eccentric guide portion 31 with respect to the first front through hole 53A1, and a second rear through hole 53B2 arranged side by side in the circumferential direction of the eccentric guide portion 31 with respect to the first rear through hole 53A2.

[0062] According to the above-described wire pressing portion 50, by adjusting the tightening amount by the pressing bolt 51, the displacement amount of the welding wire W can be finely adjusted. Thereby, for example, when the tip opening 42a expands due to the welding operation and the contact force to the contact tip 40 of the welding wire W becomes weak, by increasing the tightening amount of the pressing bolt 51, the contact force to the contact tip 40 of the welding wire W can be restored to an appropriate value again. For this reason, the life of the contact tip can be further extended.

[0063] According to the above-described adjustment mechanisms 53A1, 53A2, 53B1, and 53B2, by fastening the pressing bolt 51 to different through holes 53 in the axial direction, the axial position for eccentrically displacing the welding wire W can be adjusted. In other words, without changing the configuration of the energizing component 20, the position of the first contact position X1 can be easily changed along the longitudinal direction of the energizing component 20, so the versatility is improved.

[0064] Further, according to the adjustment mechanisms 53A1, 53A2, 53B1, and 53B2, by fastening the pressing bolt 51 to different through holes 53 in the circumferential direction, the radial direction for eccentrically displacing the welding wire W can be changed without changing the axial position of the first contact position X1. In other words, according to the bending habit of the welding wire W, the pushing direction of the welding wire W can be changed along the circumferential direction of the eccentric guide portion 31, so the versatility is improved.

[0065] Note that the adjustment mechanisms 53A1, 53A2, 53B1, and 53B2 only need to be configured such that the position of the pressing member 36 (pressing bolt 51) for eccentrically displacing the welding wire W can be adjusted in the axial direction and / or circumferential direction of the tip body 30, and are not limited to a configuration in which a plurality of through holes 53 are arranged in the axial and circumferential directions. For example, the adjustment mechanism may be configured to support the pressing member attached to the tip body 30 so as to be slidable in the axial and circumferential directions.

[0066] Note that the present invention is not limited to the above-described embodiments. Combinations of the respective components of the embodiments, as well as modifications and applications made by those skilled in the art based on the descriptions in the specification and well-known techniques, are also contemplated by the present invention and are included in the scope for which protection is sought.

[0067] As described above, the following matters are disclosed in this specification. (1) A current-carrying component of a welding torch for supplying power to a welding wire and performing arc welding, wherein the current-carrying component includes at least a contact tip for supplying power to the welding wire, and a chip body connecting the torch barrel on the proximal end side of the welding torch and the contact tip. The chip body has an eccentric guide portion having a first inner diameter, and a wire pressing portion for radially eccentrically displacing the welding wire inserted through the eccentric guide portion. The contact tip is provided with a guide hole formed along the axial direction from a tip opening formed at the tip to a rear end opening for guiding the welding wire. The guide hole has a second inner diameter smaller than the first inner diameter. Current-carrying component. According to this configuration, by disposing a wire pressing portion for stably bringing the welding wire into contact with the contact tip by utilizing the reaction force of the bending rigidity of the welding wire on the chip body, the entire welding torch can be configured compactly, and the configuration of the contact tip, which has a relatively high replacement frequency, can be simplified, so that the cost can be kept low. (2) The chip body is provided with a proximal end guide portion having a third inner diameter on the proximal end side of the eccentric guide portion. The third inner diameter is smaller than the first inner diameter and larger than the second inner diameter. The current-carrying component according to (1). According to this configuration, since the welding wire eccentrically displaced by the wire pressing portion can be deformed into a mountain shape, the force with which the welding wire contacts the contact tip side becomes more stable, and the design of the current-carrying component also becomes easier. (3) The wire pressing portion has at least a pressing member that contacts the welding wire and an elastic member for pressing the pressing member against the welding wire. The pressing member is a spherical member. The elastic member is a leaf spring-shaped member. The energizing component according to (1) or (2). According to this configuration, since the pressing member pressed against the welding wire is formed in a spherical shape, the wire pressing portion can prevent the force required to send the welding wire out from the opening of the contact tip from becoming larger than necessary while eccentrically displacing the welding wire in the radial direction. (4) In the wire pressing portion, The spherical member is accommodated in a radial through hole formed on the circumferential surface of the tip body. The leaf spring-shaped member clamps the circumferential surface of the tip body so as to press the spherical member protruding from the through hole. The energizing component according to (3). According to this configuration, since the configuration of the wire pressing portion can be simplified, the cost can be kept low, and the assembly work of the components constituting the wire pressing portion is also simplified, so the ease of maintenance is improved. (5) The proximal end guide portion has the third inner diameter according to the inner diameter of a conduit tube inserted inside the rear portion side of the tip body. The energizing component according to any one of (2) to (4). According to this configuration, by changing the conduit tube or adjusting the length, the size of the third inner diameter and the tip position of the proximal end guide portion having the third inner diameter can be easily set and changed. (6) An adjustment mechanism capable of adjusting the position is provided in the wire pressing portion with respect to the longitudinal direction or the circumferential direction of the tip body. The energizing component according to any one of (1) to (5). According to this configuration, the pressing position of the welding wire can be changed and adjusted without changing the tip body or the contact tip, so the versatility is improved. (7) A welding torch comprising the energizing component according to any one of (1) to (6). According to this configuration, by utilizing the reaction force of the bending rigidity of the welding wire and bringing the welding wire into contact with the contact tip, a welding torch capable of stabilizing the power supply to the welding wire can be configured in a compact and cost-effective manner. (8) A welding robot comprising the welding torch according to (7), and a welding power source. A welding system. According to this configuration, a welding system comprising a welding torch capable of stabilizing the power supply to the welding wire by utilizing the reaction force of the bending rigidity of the welding wire and bringing the welding wire into contact with the contact tip can be configured at low cost. (9) A method for designing the energizing component according to (2), at least, a first bending section between the tip position of the base end guide section and the pressing position of the welding wire by the wire pressing section, a second bending section between the pressing position of the welding wire by the wire pressing section and the rear end opening of the guide hole, the tip guide length which is the axial length of the guide hole, the first inner diameter, the second inner diameter, the third inner diameter, welding wire information regarding the welding wire used for welding, a contact force calculating step of calculating the contact force between the vicinity of the tip position of the contact tip and the welding wire based on the energizing component design items constituted by the above, and a design step of determining the values of the energizing component design items so that the contact force calculated in the contact force calculating step becomes an arbitrarily preset design contact force. A method for designing an energizing component. According to this configuration, an energizing component that forcibly contacts the contact tip and the welding wire with an appropriate contact force can be designed smoothly and easily. (10) The welding wire information includes at least one of the wire diameter of the welding wire and the mechanical properties of the welding wire. The method for designing an energizing component according to (9). According to this configuration, even when the shape and mechanical properties of the welding wire supplied by the welding torch are different, an energizing component that forcibly contacts the contact tip and the welding wire with an appropriate contact force can be designed smoothly and easily. (11) A contact tip used for a welding torch for supplying power to a welding wire and performing arc welding, The inner surface of the contact tip, A cylindrical connecting portion disposed at the rear end and connected to the axial front end of the tip body; A tapered portion whose diameter decreases toward the front side in the axial direction from the connecting portion; A guide hole formed along the axial direction from the rear end opening communicating with the tip of the tapered portion to the tip opening formed at the tip of the contact tip, for guiding the welding wire; and has, The second inner diameter forming the guide hole is larger than the shape of the welding wire, while being smaller than the first inner diameter of the pressing space in which the welding wire is pressed in the radial direction by the eccentric guide portion of the tip body. The guide hole contacts the welding wire at the rear end opening and the tip opening. Contact tip. According to this configuration, a contact tip with which a welding wire is contacted with an appropriate contact force can be obtained.

Explanation of reference numerals

[0068] 1 Welding system 2 Wire pack 3 Torch cable 4 Wire feeding device 5 Welding power source 6 Manipulator 7 Welding robot 10 Welding torch 11 Torch body 12 Nozzle 13 Connector Tube 14 Nut 20 Energizing Component 30 Chip Body 31 Eccentric Guide Part 31a Step 32 Base End Guide Part 33 Wire Pressing Part 34, 35 Male Screw Part 36 Contact Member, Steel Ball (Spherical Member) 37 Biasing Member, Leaf Spring (Elastic Member) 38 Holding Part 38A Groove Part 38B Notch Surface 38B1 Contact Surface 38B2 Locking Part 38C Through Hole 39 Cover Body 40 Contact Chip 42 Guide Hole 42a Tip Opening 42b Rear End Opening 43 Taper Part 44 Connecting Part 44a Female Screw Part 50 Wire Pressing Part 51 Pressing Bolt 53 Through Hole 53A1 First Front Through Hole (Adjustment Mechanism) 53A2 First Rear Through Hole (Adjustment Mechanism) 53B1 Second Front Through Hole (Adjustment Mechanism) 53B2 Second Rear Through Hole (Adjustment Mechanism) W Welding Wire R1 First Inner Diameter R2 Second Inner Diameter R3 Third Inner Diameter L1 First Bending Section L2 Second Bending Section X0 Tip Contact Position X1 First Contact Position X2 Second Contact Position X3 Third Contact Position T Tip Guide Length

Claims

1. An energizing component of a welding torch for supplying power to a welding wire and performing arc welding, The energizing component includes at least a contact tip for supplying power to the welding wire, and a tip body connecting the torch barrel on the proximal end side of the welding torch and the contact tip. The tip body has an eccentric guide portion having a first inner diameter, and a wire pressing portion for eccentrically displacing the welding wire inserted through the eccentric guide portion in the radial direction. The contact tip is provided with a guide hole formed along the axial direction from a tip opening formed at the tip to a rear end opening for guiding the welding wire. The guide hole has a second inner diameter smaller than the first inner diameter. Energizing component.

2. The tip body is provided with a proximal end guide portion having a third inner diameter on the proximal end side of the eccentric guide portion. The third inner diameter is smaller than the first inner diameter and larger than the second inner diameter. The energizing component according to claim 1.

3. The wire pressing portion has at least a pressing member that contacts the welding wire, and an elastic member for pressing the pressing member against the welding wire. The pressing member is a spherical member. The elastic member is a leaf spring-like member. The energizing component according to claim 1.

4. In the wire pressing portion, The spherical member is accommodated in a radial through hole formed on the peripheral surface of the tip body. The leaf spring-like member clamps the peripheral surface of the tip body so as to press the spherical member protruding from the through hole. The energizing component according to claim 3.

5. The base end guide part has the third inner diameter according to the inner diameter of a conduit tube inserted into the rear part side of the chip body. The energization component according to claim 2.

6. An adjustment mechanism that can be adjusted in position with respect to the longitudinal direction or the circumferential direction of the chip body is provided in the wire pressing part. The energization component according to any one of claims 1 to 5.

7. A welding torch including the energization component according to any one of claims 1 to 5.

8. A welding robot including the welding torch according to claim 7, and a welding power source. A welding system.

9. A design method for the energization component according to claim 2, at least a first bending section between the tip position of the base end guide part and the pressing position of the welding wire by the wire pressing part, a second bending section between the pressing position of the welding wire by the wire pressing part and the rear end opening of the guide hole, a tip guide length that is the axial length of the guide hole, the first inner diameter, the second inner diameter, the third inner diameter, welding wire information regarding the welding wire used for welding, a contact force calculation step of calculating a contact force between the vicinity of the tip position of the contact tip and the welding wire based on the energization component design items composed of a design step of determining the values of the energization component design items so that the contact force calculated in the contact force calculation step becomes a preset design contact force. A design method for an energization component.

10. The welding wire information includes at least one of the wire diameter of the welding wire and the mechanical properties of the welding wire. The method for designing an energized component according to claim 9.

11. A contact tip used for a welding torch for supplying power to a welding wire and performing arc welding, The inner surface of the contact tip, A cylindrical connecting portion disposed at the rear end and connected to the axial front end of the chip body; A tapered portion whose diameter decreases toward the front side in the axial direction from the connecting portion; A guide hole formed along the axial direction from the rear end opening communicating with the tip of the tapered portion to the tip opening formed at the tip of the contact tip, for guiding the welding wire; and The second inner diameter forming the guide hole is larger than the linearity of the welding wire, while being smaller than the first inner diameter of the pressing space in which the welding wire is pressed in the radial direction by the eccentric guide portion of the chip body. The guide hole contacts the welding wire at the rear end opening and the tip opening. Contact tip.

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