JP4984295B2 - Electric resistance welding electrode - Google Patents

Description

This invention is related to electric resistance welding electrodes.

There is an electric resistance welding electrode of the type in which an operating shaft that moves forward and backward passes through the center of the electrode unit, and the tip of this operating shaft protrudes from the electrode unit to serve as a guide pin, and this guide pin positions the part Are known. It is also known to provide a cooling fluid cooling passage in the insulating material inside the electrode.
Japanese Patent No. 3838565 International Publication No. 2004/009280 Pamphlet

  The electrode described in Patent Document 1 includes a guide pin for positioning a component and a cooling water passage inside an outer cylinder constituting the electrode body, and an air cylinder that advances and retracts the guide pin at the lower part of the outer cylinder. Are combined. And the cooling water inlet and outlet to the cooling water passage are arranged in the vicinity of the air cylinder, and the cooling water passes through a long water passage in the axial direction of the electrode. With such a structure, since the guide pins and the cooling water passage are mixed inside the outer cylinder, for example, when replacing the cooling water seal, remove the outer cylinder from the air cylinder. All internal structures must be disassembled, which makes maintenance very difficult. That is, the above-mentioned problem occurs because the cooling portion of the electrode unit, the support cylinder that supports the entire electrode and conducts welding current, and the advancing / retreating drive means for advancing and retracting the guide pin are not separated. .

  Patent Document 2 discloses that a cooling water passage is provided in a guide tube made of an insulating material inserted into an outer cylinder. However, the cooling part of the electrode unit as described above and the entire electrode are arranged. There is no description on how to form a partition structure of a support cylinder that supports and conducts welding current and an advance / retreat driving means that advances and retracts the guide pin. In addition, no consideration is given to smoothly operating the guide pin advance / retreat operating shaft.

  The present invention is provided in order to solve the above-described problems. An electrode for electric resistance welding that can smoothly advance and retract the operation axis of the guide pin, and can easily manufacture and disassemble the electrode, and its electrode The purpose is to provide a cooling method.

Means to solve the problem

The invention according to claim 1 is an invention relating to an electrode for electric resistance welding, wherein an operation shaft for advancing and retreating through the central portion of the electrode unit penetrates, and a component in a state in which a tip portion of the operation shaft protrudes from the electrode unit. The electrode unit is disposed at the inside of a case body having a circular cross section having an end lid at the end made of at least a conductive metal material. And a cylindrical heat insulating member having a through-hole through which the operation shaft passes, and a cooling fluid cooling passage for cooling the heat insulating member is provided in a state of circulating in the circumferential direction of the case body. is a support tube which is made of a metallic material with conductivity attached to a stationary member, said electrode unit coupled to one end of the support cylinder, absolute to the other end of the support tube Advancing drive means for advancing and retracting the operation shaft is coupled through a member is assumed that independent,
The end lid is coupled to the upper end of the case body via a threaded portion, and the electrode unit is coupled to the one end of the support cylinder via the threaded portion, so that the electrode unit is in an independent state. The advancing / retreating drive is configured such that the insulating member arranged at the other end of the support cylinder is coupled to the support cylinder and the advancing / retreating drive means via a screw portion so as to be detachable from the support cylinder. The means is configured to be detachable from the support cylinder in an independent state, a gap is provided between the heat insulating member and the operation shaft, and the heat insulating member is formed of a synthetic resin material. It is what.

The invention's effect

  The operating shaft passes through the cylindrical heat insulating member, a predetermined gap is provided between the outer peripheral surface of the operating shaft and the inner peripheral surface of the through hole of the heat insulating member, and the operating shaft advances and retreats in the heat insulating member. The gap may be a minute gap such that the outer peripheral surface of the operating shaft slides with respect to the inner peripheral surface of the through hole. Alternatively, there may be a space in which impurities entering between the outer peripheral surface of the operating shaft and the inner peripheral surface of the through hole are accommodated or passed to avoid an increase in the advancing / retracting resistance of the operating shaft. .

  For example, when the projection nut is welded to the steel plate part, the heat of the welded portion is transmitted from the end cover to the heat insulating member through the case body, or from the end cover to the heat insulating member through the operation shaft. Therefore, if the heat insulating member is not cooled or insufficient, the heat insulating member expands excessively and the inner diameter of the through hole is reduced. By such a reduction, the above-described minute gap is remarkably narrowed and a state of zero gap is obtained. In such a state, the frictional resistance between the operating shaft and the through hole becomes abnormally large, and it is impossible to smoothly advance and retract the operating shaft.

  In the present invention, since the cooling passage for the cooling fluid for cooling the heat insulating member is provided in a state of being circulated in the circumferential direction of the case body, the welding heat transmitted to the heat insulating member can be effectively removed. Therefore, the above-described abnormal reduction of the inner diameter of the through hole can be avoided, the abnormal increase in frictional resistance between the operating shaft and the through hole can be prevented, and a smooth advance / retreat operation of the operating shaft can be ensured.

  In addition, even in the above-described case where impurities such as spatter and metal pieces are accommodated or passed, by avoiding abnormal reduction of the inner diameter of the through-hole, the abnormal reduction of the air gap is prevented and the operating axis is prevented. Impurities are not caught between the through hole and the smooth movement of the operating shaft can be ensured.

A supporting cylinder made of a metal material is attached to a stationary member with a guide facultative, the said electrode unit coupled to one end of the support tube, the other end of the support cylinder is connected via an insulating member the advancing drive means for advancing and retracting the operation shaft that is assumed to have independent.

  As described above, since the support cylinder, the electrode unit, and the advance / retreat driving means are independent, in manufacturing the electrode, the support cylinder, the electrode unit, and the advance / retreat drive means are separately formed, and these are simply combined. It is easy to manufacture because it only needs to be assembled. Furthermore, for example, when repairing a cooling fluid leak, only the electrode unit needs to be removed and disassembled. When repairing an air leak of the air cylinder that is the forward / backward drive means, only the air cylinder is removed and disassembled. Good. Therefore, the disassembling work is simplified and effective in improving the working efficiency. On the other hand, since the advance / retreat driving means is coupled to the support cylinder via the insulating member, it is possible to reliably prevent an abnormal welding current flowing through the operating shaft from being supplied from the advance / retreat drive means to the stationary member via the support cylinder. . Further, since the cooling means can be disposed in the vicinity of the heat source near the guide pin, the cooling means can surely insulate, and the heat flow to the support tube and the advance / retreat driving means can be cut off.

Before SL cooling passages that are formed between the heat insulating member and the case body.

  Since the heat of welding is taken between the heat insulating member and the case main body, reliable heat insulation is achieved near the heat source, and the thermal influence on the support cylinder and the advancing / retreating driving means can be minimized.

Before SL cooling passages that are formed on the outer periphery of the heat insulating member.

  By forming the cooling passage in the outer peripheral portion of the heat insulating member, reliable heat insulation can be achieved at the portion of the heat insulating member, and the thermal influence on the support cylinder and the advance / retreat driving means can be minimized. And since the thickness of the heat insulation member in the location of this cooling passage becomes thin by forming a cooling passage in the perimeter part of a heat insulation member, the amount of thermal expansion of this part decreases, and the inside diameter of the above-mentioned through-hole by thermal expansion Reduction can be greatly reduced.

That are void is provided between the front Stories heat insulating member and the operation shaft.

  By setting this gap to a predetermined value, even if impurities such as spatter and iron scrap enter the gap, they can be accommodated or passed through, and the impurity between the operating shaft and the through hole Therefore, the smooth movement of the operating shaft can be ensured.

Oh Ru by penetrating movement axis before Symbol insulating member is in a state of sliding.

  Even if the outer peripheral surface of the operating shaft slides on the inner surface of the through hole, abnormal reduction of the inner diameter of the through hole can be avoided, so that the frictional resistance between the operating shaft and the through hole is reduced. Abnormal increase can be prevented, and smooth movement of the operation axis can be ensured.

Before SL cooling passages, Ru tare arranged in a state of substantially in correspondence with the locations operating shaft in the heat insulating member as viewed in the axial direction of the electrode unit extends through.

  As described above, since most of the portion where the operating shaft passes through the heat insulating member is cooled by the cooling passage, the cooling range in the electrode axis direction can be set large, and the cooling effect is improved.

Before Symbol insulation member that is made of non-metallic material with insulating properties.

  Since the heat insulating member is made of an insulating non-metallic material in this way, even when the operating shaft slides on the inner surface of the through hole, abnormal current flowing to the operating shaft is directed toward the case body. Short circuit can be prevented. In addition, since such a material has a large amount of thermal expansion, if the cooling is insufficient, the inner diameter of the through hole is greatly reduced, which adversely affects the smooth movement of the operating shaft. However, since the cooling as described above is performed, even such a material can function without any problem.

Next, the best mode for carrying out the electrical resistance welding electrodes of the present invention.

  FIG. 1 shows a first embodiment.

  1A is a sectional view of the entire electrode for electric resistance welding, FIG. 1B is a sectional view taken along the line BB in FIG. 1A, and FIG. 1C is a sectional view taken along the line CC in FIG. FIG. The entire electrode for electric resistance welding is indicated by reference numeral 100. Hereinafter, the electrode for electric resistance welding may be simply expressed as an electrode.

  The overall configuration of the electrode 100 will be described.

  The electrode 100 is disposed in a substantially vertical direction. The support cylinder 1 made of a conductive metal material such as chrome copper has a circular cross section, and is coupled to the stationary member 3 via a support member 2 made of the same material as the support cylinder 1. This stationary member 3 is a member such as a column of a welding machine. The support member 2 is provided with a support hole 4 through which the support cylinder 1 passes, and the support cylinder 1 is fastened in the support hole 4 to fix the support cylinder 1.

  An electrode unit 6 is coupled to the upper end portion of the support cylinder 1 via a screw portion 5. A steel plate part 7 is placed on the electrode unit 6 and a projection nut 8 is welded thereto. Here, the electrode unit 6 is a fixed electrode, and a movable electrode 9 facing the electrode unit 6 is provided. Note that the structure for moving the movable electrode 9 back and forth is omitted.

  On the other hand, an air cylinder 12, which is a forward / backward drive means, is coupled to the lower end portion of the support cylinder 1 via an insulating member 10. The insulating member 10 is made of a synthetic resin such as a polyamide resin or a polypropylene resin, and has a cylindrical shape. The insulating member 10 is coupled to the lower portion of the support cylinder 1 through a screw portion 13 on the upper side, and is coupled to the air cylinder 12 via a screw portion 14 on the lower side of the insulating member 10. The piston rod 16 of the air cylinder 12 is coupled to the operating shaft 15 penetrating through the electrode 100, and the operating shaft 15 is advanced and retracted by the advance / retreat output of the air cylinder 12.

  Next, the electrode unit will be described.

  In the electrode unit 6, a cylindrical heat insulating member 18 is inserted into a case body 17 having a circular cross section made of a conductive metal material such as chromium copper. An end lid 20 is coupled to the upper end of the case body 17 via a screw portion 19, and the steel plate part 7 is placed on the end lid 20. An end member 22 is coupled to the lower end of the case body 17 via a screw portion 21. A through hole 23 is formed in the central portion of the heat insulating member 18, and the operation shaft 15 passes therethrough.

  The cooling passage 25 is provided in the outer peripheral part of the heat insulating member 18 in a state of being circulated in the circumferential direction. The cooling fluid here is water, and the inlet pipe 26 and the outlet pipe 27 communicating with the cooling passage 25 are provided in a positional relationship in which they are substantially opposed to each other. In order to seal the cooling water, O-rings 28 are arranged above and below the heat insulating member 18. The cooling passage 25 is disposed in a state substantially corresponding to a portion where the operating shaft 15 penetrates the heat insulating member 18 when viewed in the axial direction of the electrode unit 6. That is, the axial width of the cooling passage 25 is as close as possible to the length of the heat insulating member 18.

  On the upper side of the portion where the operating shaft 15 penetrates the electrode unit 6, a guide pin 30 is joined via a screw portion 29 so that only the guide pin 30 can be exchanged. This guide pin 30 protrudes from the electrode unit 6 and passes through the lower hole 31 of the steel plate component 7 and the screw hole 32 of the projection nut 8 to position the component.

  The inner diameter of the through hole 33 formed in the end lid 20 is set to be larger than the outer diameter of the guide pin 30 so that the guide pin 30 does not contact the inner surface of the through hole 33. For this purpose, a guide cylinder 34 made of an insulating material is fitted into the through hole 33, and the guide pin 30 penetrates the guide cylinder 34 in a slidable state. The inner diameter of the through-hole 33 is 6 mm, the outer diameter of the guide pin 30 is 5 mm, and the annular gap formed thereby is 0.5 mm.

  The inner diameter of the through hole 23 is 6 mm, the outer diameter of the operating shaft 15 penetrating this portion is 5 mm, and the annular gap 35 formed thereby is 0.5 mm. Fine spatter and metal pieces that have passed through the guide cylinder 34 pass through the gap 35 and are discharged into the support cylinder 1.

  As a material constituting the heat insulating member 18, a synthetic resin having good processability is used. For example, polyamide resin or polypropylene resin is used. On the other hand, the heat insulating member 18 can be made of a material having good thermal conductivity such as aluminum or copper alloy. In this embodiment, it is a polyamide resin.

  As is clear from FIG. 1C, the cooling water flowing in from the inlet pipe 26 divides left and right, goes around the cooling passage 25 and exits from the outlet pipe 27. Therefore, the welding heat from the welded portion is transferred to the cooling passage 25 through the end lid 20 and the case body 17. Further, the heat is transferred from the guide pin 30 to the heat insulating member 18 through the guide tube 34 and the end lid 20, and is transferred to the cooling passage 25. The welding heat transferred to the cooling passage 25 through such a heat flow path is taken away by the cooling water, and heat conduction downward is suppressed.

  Therefore, the temperature of the heat insulating member 18 itself is kept low, and accordingly, the thermal expansion amount of the heat insulating member 18 is reduced, and the inner diameter of the through hole 23 is also allowed to be reduced. For example, the gap 35 is only reduced from 0.5 mm to 0.47 mm, and impurities such as spatter and iron scrap are not clogged in the gap 35, and the smooth movement of the operating shaft 15 is ensured. Is done. And since the cooling channel | path 25 can be arrange | positioned in the location close | similar to the welding part which is a heat source, welding heat is transmitted to the downward direction of the electrode 100, and a thermal bad influence does not generate | occur | produce.

  The projection nut 8 has a square shape, a screw hole 31 is formed in the center thereof, and welding projections 11 are provided at the four corners on one side. The dimension of the square part is 12 mm × 12 mm, and the thickness is 6 mm. The inner diameter of the screw hole 32 is 4.8 mm. When the movable electrode 9 descends and hits the upper surface of the projection nut 8, the operating shaft 15 descends almost simultaneously with the air cylinder 12 to press the welding projection 11 to the steel plate component 7, and subsequently the welding current is applied. Energized.

  The welding current flows to the movable electrode 9, the projection nut 8, the welding protrusion 11, the steel plate part 7, the end lid 20, the case body 17, the end member 22, the support cylinder 1, and the support member 2. In the unlikely event that a welding current flows through the guide pin 30, energization is interrupted in the insulating member 10, and the energization circuit is not established, thereby preventing abnormal energization.

  Next, the advance / retreat driving means will be described.

  The advance / retreat driving means may be any means that causes the operation shaft 15 to advance / retreat, and an air cylinder or an electric motor that performs advance / retreat output is used. In this embodiment, the air cylinder 12 is used as described above.

  FIG. 1D shows a modification of the cooling passage 25. Here, the cooling passage 25 is constituted by a cooling groove 36 provided in the circumferential direction inside the head main body 17. The other configuration is the same as that of the previous example including a portion not shown, and the same reference numerals are described for members having similar functions.

  The above-described operation can be easily performed by a generally adopted control method, and a signal is transmitted at a predetermined position of an air switching valve or an air cylinder operated by an operation signal from a control device or a sequence circuit. This can be ensured by combining sensors that emit and transmit to the control device.

  The operational effects of the first embodiment described above are as follows.

  The operation shaft 15 passes through the cylindrical heat insulating member 18, a predetermined gap 35 is provided between the outer peripheral surface of the operation shaft 15 and the inner peripheral surface of the through hole 23, and the operation shaft 15 is in the heat insulating member 18. Advance and retreat. The gap 35 is a space that accommodates or allows impurities that have entered between the outer peripheral surface of the operating shaft 15 and the inner peripheral surface of the through hole 23 to avoid an increase in the advancing / retracting resistance of the operating shaft 15. It is said.

  For example, when the projection nut 8 is welded to the steel plate part 7, heat of the welded portion is transmitted from the end lid 20 to the heat insulating member 18 through the case body 17, or from the end lid 20 through the operation shaft 15 to insulate. Or transmitted to the member 18. Therefore, if the heat insulating member 18 is not cooled or insufficient, the heat insulating member 18 is excessively expanded and the inner diameter of the through hole 23 is reduced. By such a reduction, the above-described gap 35 is remarkably narrowed, and it becomes impossible to accommodate or pass impurities such as spatter and metal pieces. Such impurities pass through a slight sliding gap set in the guide tube 34 and reach the gap 35.

  As described above, since the cooling fluid cooling passage 25 for cooling the heat insulating member 18 is provided in a state of circling in the circumferential direction of the case body 17, the heat of welding transmitted to the heat insulating member 18 can be effectively removed. Can do. Therefore, the above-described abnormal reduction of the inner diameter of the through-hole 23 can be avoided, impurities are not caught between the operation shaft 15 and the through-hole 23, and a smooth advance / retreat operation of the operation shaft 15 can be ensured. .

  A support cylinder 1 made of a conductive metal material and attached to a stationary member; the electrode unit 6 coupled to one end of the support cylinder 1; and an insulating member 10 at the other end of the support cylinder 1 The air cylinder 12 that is coupled to move the operating shaft 15 forward and backward is independent.

  Since the support cylinder 1, the electrode unit 6, and the air cylinder 12, which is a forward / backward drive means, are thus independent, in the production of the electrode 100, the support cylinder 1, the electrode unit 6 and the air cylinder 12 are divided into three parts. It is easy to manufacture because it is made separately and simply combined and assembled. Further, for example, when repairing the leakage of the cooling fluid, only the electrode unit 6 may be removed and disassembled, and when repairing the air leak of the air cylinder 12, only the air cylinder 12 may be removed and disassembled. Therefore, the disassembling work is simplified and effective in improving the working efficiency. On the other hand, since the air cylinder 12 is coupled to the support cylinder 1 via the insulating member 10, abnormal welding current flowing through the operating shaft 15 is energized from the air cylinder 12 to the stationary member 3 via the support cylinder 1. Can be reliably prevented. In addition, since the cooling passage 25 can be disposed in the vicinity of the heat source in the vicinity of the guide pin 30, heat insulation to the support cylinder 1 and the air cylinder 12 can be interrupted reliably at this portion.

  The cooling passage 25 is formed between the heat insulating member 18 and the case body 17.

  Since the heat of welding is removed between the heat insulating member 18 and the case main body 17, reliable heat insulation is achieved near the heat source, and the thermal influence on the support cylinder 1 and the air cylinder 12 can be minimized. it can.

  The cooling passage 25 is formed in the outer peripheral portion of the heat insulating member 18.

  By forming the cooling passage 25 in the outer peripheral portion of the heat insulating member 18, reliable heat insulation is achieved at the portion of the heat insulating member 18, and the thermal influence on the support cylinder 1 and the air cylinder 12 can be minimized. And since the thickness of the heat insulation member 18 in the location of this cooling passage 25 becomes thin by forming the cooling passage 25 in the outer peripheral part of the heat insulation member 18, the amount of thermal expansion of this part decreases, and the above-mentioned due to thermal expansion. The inner diameter reduction of the through hole 23 can be greatly reduced.

  A gap 35 is provided between the heat insulating member 18 and the operating shaft 15.

  By setting the gap 35 to a predetermined value, even if impurities such as spatter and iron scrap enter the gap 35, the gap 35 can be accommodated or passed through. Impurities are not caught between them, and the smooth movement of the operating shaft 15 can be ensured.

  The cooling passage 25 is disposed in a state substantially corresponding to a portion where the operating shaft 15 penetrates the heat insulating member 18 when viewed in the axial direction of the electrode unit 6.

  As described above, since most of the portion where the operating shaft 15 penetrates the heat insulating member 18 is cooled by the cooling passage 25, the cooling range in the electrode axis direction can be set large, and the cooling effect is improved.

  The heat insulating member 18 is made of an insulating nonmetallic material.

  Since the heat insulating member 18 is made of an insulating non-metallic material in this way, even if iron scraps are caught in the gap 35, an abnormal current flowing to the operating shaft 15 is directed toward the case body 17. Short circuit can be prevented. In addition, since such a material has a large amount of thermal expansion, if the cooling is insufficient, the inner diameter of the through hole 23 is greatly reduced, and the smooth advance and retreat operation of the operation shaft 15 is adversely affected. However, since the cooling as described above is performed, even such a material can function without any problem.

  FIG. 2 shows a second embodiment.

  In the second embodiment, the operating shaft 15 slides on the inner surface of the through-hole 23, and the above-described guide tube 34 is eliminated accordingly. Therefore, the above-described gap 35 is not formed, and a minimum minute gap necessary for the operation shaft 15 to slide on the inner surface of the through hole 23 is provided. Other configurations are the same as those of the first embodiment including the portions not shown, and members having the same functions are denoted by the same reference numerals.

  The operational effects of the second embodiment described above are as follows.

  For example, when the projection nut 8 is welded to the steel plate part 7, heat of the welded portion is transmitted from the end lid 20 to the heat insulating member 18 through the case body 17, or from the end lid 20 through the operation shaft 15 to insulate. Or transmitted to the member 18. Therefore, if the heat insulating member 18 is not cooled or insufficient, the heat insulating member 18 is excessively expanded and the inner diameter of the through hole 23 is reduced. By such a reduction, the above-described minute gap is remarkably narrowed and a state of zero gap is obtained. In such a state, the frictional resistance between the operating shaft 15 and the through hole 23 becomes abnormally large, and it is impossible to smoothly advance and retract the operating shaft 15.

  In the present embodiment, the cooling fluid cooling passage 25 for cooling the heat insulating member 18 is provided in a state in which it circulates in the circumferential direction of the case main body 17, so that the welding heat transmitted to the heat insulating member 18 is effectively reduced. I can take it away. Therefore, the above-described abnormal reduction of the inner diameter of the through-hole 23 can be avoided, the abnormal increase in the frictional resistance of the sliding portion can be prevented, and the smooth movement of the operating shaft 15 can be ensured.

  The heat insulating member 18 is made of an insulating nonmetallic material.

  Since the heat insulating member 18 is made of an insulating non-metallic material in this way, even if the operating shaft 15 slides on the inner surface of the through hole 23, an abnormal current flowing to the operating shaft 15 is generated in the case body. A short circuit toward 17 can be prevented. In addition, since such a material has a large amount of thermal expansion, if the cooling is insufficient, the inner diameter of the through hole 23 is greatly reduced, and the smooth advance and retreat operation of the operation shaft 15 is adversely affected. However, since the cooling as described above is performed, even such a material can function without any problem. Other functions and effects are the same as those of the first embodiment.

  FIG. 3 shows a third embodiment.

  In the third embodiment, compressed air is sent from the lower side of the heat insulating member 18 so that impurities such as spatter and iron scrap do not enter the electrode unit 6. A supply cylinder 38 through which the operating shaft 15 passes is inserted below the heat insulating member 18, and a circumferential annular groove 39 provided on the outer periphery thereof is provided. A vent hole 40 is formed to send air from the annular groove 39 to the inside of the supply cylinder 38. An air supply pipe 41 that supplies air to the annular groove 39 is attached to the case body 17. Other configurations are the same as those of the previous embodiments, including the portions not shown, and members having the same functions are denoted by the same reference numerals.

  The compressed air supplied from the supply pipe 41 is supplied to the inside of the supply cylinder 38 through the annular groove 39 and the vent hole 40. As a result, the compressed air passes through the gap between the operating shaft 15 and the supply cylinder 38 and the gap between the operating shaft 15 and the heat insulating member 18 and is ejected from the through hole 33. Therefore, impurities such as spatter and iron scraps that try to enter from the gap between the through hole 33 and the guide pin 30 are discharged. Other functions and effects are the same as those of the previous embodiments.

  FIG. 4 shows a fourth embodiment.

  In the fourth embodiment, the component is replaced with the projection nut 8 described above to form a shaft-shaped component. There are various types of shaft-shaped parts, but here the projection bolt 42 is used. This is constituted by a shaft portion 43 provided with a male screw, a flange portion 44 integral therewith, and a welding projection 45 formed on the flange portion 44. As shown in FIG. 4B, a recess 46 is provided at the tip of the guide pin 30, and the tip of the shaft 43 is received here.

  The projection bolt 42 enters the through-hole 33 as the operating shaft 15 moves backward while being sandwiched between the guide pin 30 and the movable electrode 9. Since the tip end of the shaft portion 43 fits into the recess 46 during the transitional period of this approach, the shaft portion 43 and the guide pin 30 are accurately aligned. When the projection bolt 42 has completely entered the through hole 33, welding current is applied and welding is performed. Other configurations are the same as those of the previous embodiments, including the portions not shown, and members having the same functions are denoted by the same reference numerals. The other functions and effects are the same as those of the previous embodiments.

  As described above, according to the present invention, the operation axis of the guide pin can be smoothly advanced and retracted to facilitate the manufacture and disassembly of the electrode, so that the vehicle body welding process of automobiles and the sheet metal welding of home appliances can be performed. It can be used in a wide range of industrial fields such as processes.

It is sectional drawing of the whole electrode of Example 1, and each part. It is the whole electrode of Example 2, and a partial sectional view. 6 is a cross-sectional view of the entire electrode of Example 3. FIG. It is sectional drawing of the whole electrode of Example 4, and the principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support cylinder 2 Support member 6 Electrode unit 7 Steel plate part 8 Projection nut 10 Insulating member 12 Air cylinder, advancing / retreating drive means 15 Operating shaft 17 Case main body 18 Thermal insulation member 20 End cover 23 Through-hole 25 Cooling passage 30 Guide pin 33 Through-hole 34 Guide tube 35 Gap 36 Cooling groove 42 Projection bolt 46 Recess

Claims (1)

In the type in which the operation shaft that moves forward and backward passes through the center portion of the electrode unit, and the tip of the operation shaft protrudes from the electrode unit and serves as a guide pin for positioning the component, the electrode unit is Cylindrical heat insulation having a circular case main body made of at least a conductive metal material and having an end cover at the end, and a through hole disposed inside the case main body and through which the operating shaft passes. A cooling fluid cooling passage that cools the heat insulating member is provided in a state that it circulates in the circumferential direction of the case body, and is made of a conductive metal material and attached to a stationary member. A cylinder, the electrode unit coupled to one end of the support cylinder, and an advancing / retreating drive unit coupled to the other end of the support cylinder via an insulating member to advance and retract the operation shaft are independent. Is a thing was,
The end lid is coupled to the upper end of the case body via a threaded portion, and the electrode unit is coupled to the one end of the support cylinder via the threaded portion, so that the electrode unit is in an independent state. The advancing / retreating drive is configured such that the insulating member arranged at the other end of the support cylinder is coupled to the support cylinder and the advancing / retreating drive means via a screw portion so as to be detachable from the support cylinder. The means is configured to be detachable from the support cylinder in an independent state, a gap is provided between the heat insulating member and the operation shaft, and the heat insulating member is formed of a synthetic resin material. An electrode for electric resistance welding.

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