JP4905246B2 - Welding equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide welding equipment with which parts such as a projection bolt or a projection nut are selectively welded by electric resistance welding by inserting steel-sheet parts between electrodes. <P>SOLUTION: A receiving hole 28 into which the shaft part 2 of a bolt 1 is inserted is formed on one electrode 12, the other electrode 13 which is paired with the electrode 12 is composed of a first electrode 16 which is used for welding the bolt 1 and a second electrode 17 which is used for welding the nut 5. The first electrode 16 and the second electrode 17 are attached to a changing mechanism 21 by which a position when the bolt welded and a position when the nut is welded are alternately changed. In this way, a plurality of welding functions are imparted to single welding equipment. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a method of welding a component such as a projection bolt or a projection nut to a steel plate component by electric resistance welding.

Japanese Patent Application Laid-Open No. 62-166085 discloses that a C-type gun equipped with a pair of electrodes is brought close to a steel plate part by a robot apparatus and a projection nut is welded to the steel plate part. This publication also discloses that a nut supply device is provided in the C-type gun.
JP-A-62-166085

  In the prior art as described above, only the projection nut is welded, and nothing is disclosed about welding of other parts such as a projection bolt. In particular, no consideration is disclosed regarding welding a plurality of parts in one C-type gun.

  The present invention is provided in order to solve the above-described problems, and an electrode is attached to a pair of arm members, and a steel plate part is inserted between the electrodes so that a projection bolt or a projection is attached to the steel plate part. It aims at providing the welding apparatus which can weld parts, such as a nut, by electrical resistance welding.

Means to solve the problem

The invention described in claim 1
A movable electrode and a fixed electrode arranged on the electrode axis are attached to a pair of arm members, and a steel plate component is inserted between the movable electrode and the fixed electrode , and a component such as a projection bolt or a projection nut is inserted into the steel plate component. the in what form the welding electric resistance welding, the receiving hole the shaft portion of the projection bolt is inserted into the movable electrode is formed, the fixed electrode forming the movable electrode and the counter, when welding the projection bolt A first electrode having a flat end face and a second electrode having a guide pin provided on the end face used when welding the projection nut are used. The first electrode and the second electrode are positioned at the time of projection bolt welding. It is attached to a conversion mechanism that can alternately convert to the position at the time of projection nut welding.
A bolt supply device is attached to one side surface of the arm member to which the movable electrode is attached, and a nut supply device is attached to the other side surface of the arm member to which the movable electrode is attached . A bolt supply rod is disposed in an oblique direction with respect to the electrode axis, and a nut supply rod of the nut supply device is disposed in an oblique direction with respect to the electrode axis;
In the conversion mechanism, the first electrode and the second electrode are attached to a support member formed of an elongated member, and a rotation shaft is attached to a support member at a central portion of both electrodes, and the rotation shaft is fixed to the fixing member. The rotary shaft is supported by a penetrating arm member to which the electrode is attached, and is configured to rotate by a rotation driving means fixed to the lower side of the arm member. The axis of the rotary shaft is parallel to the electrode axis. It is the welding apparatus characterized by arrange | positioning.

  In the following description, the projection bolt may be simply expressed as a bolt, and the projection nut may be simply expressed as a nut.

The invention's effect

  When the shaft portion of the projection bolt is inserted into the receiving hole and the bolt is welded to the steel plate part, the conversion mechanism operates to position the first electrode at a predetermined position on the electrode axis. Then, the bolt is pressed against the steel plate part, and a welding current is further applied to complete the welding. When the projection nut is welded to the steel plate part, the conversion mechanism operates to position the second electrode at a predetermined location on the electrode axis. Next, a steel plate part is set on the guide pin, and a nut is further held on the guide pin. Thereafter, the nut is pressed against the steel plate part, and a welding current is applied to complete the welding.

  As described above, the first electrode suitable for bolt welding is positioned at a predetermined position on the electrode axis, and the second electrode suitable for the nut welding is positioned at a predetermined position on the electrode axis. That is, the counterpart electrode adapted when welding the bolt or nut can be selected by the conversion mechanism. Therefore, the welding function of a bolt and a nut can be held in one welding apparatus, and the welding apparatus itself can be multi-functionalized, and simplification of welding equipment is promoted.

  In addition to these two types of bolts and nuts, for example, a third electrode for welding a part such as an annular distance piece can be arranged in the conversion mechanism, and thereby the welding apparatus Multifunctionalization can be further promoted.

A chromatography arm member to the bolt feeder is mounted, the bolt feeder is advanced a bolt feed rod holding the projection bolt, the receiving hole of the shaft portion from a state in which the shaft portion becomes coaxial with the electrode axis Ru der shall be inserted.

  Since the bolt supply device is attached to the arm member, the distance between the bolt supply device and the receiving hole is shortened, and the bolt supply to the receiving hole can be reliably performed in a short time. Since the bolt supply rod is inserted into the receiving hole after the bolt shaft portion and the electrode axis line are matched by the operation of the bolt supply rod, the bolt moving path is simplified, and the bolt supply to the receiving hole is ensured.

A chromatography arm member to the nut feeder is mounted, the nut supply device is to advance the nut feed rod holding the projection nut, Ru der which the guide pin into the threaded hole of the projection nut is relatively penetrate .

  Since the nut supply device is attached to the arm member, the distance between the nut supply device and the guide pin is shortened, and the nut can be reliably supplied to the guide pin in a short time. Since the nut can be directly supplied to the guide pin by the operation of the nut supply rod, the nut is reliably supplied to the guide pin.

Volt supply device to the side of one side of A over arm member is attached, that have a nut feeding apparatus is mounted to the side of the other side of the arm member.

  As described above, since the bolt supply device and the nut supply device are respectively attached to both side surfaces of the arm member, both the supply devices can be arranged compactly on the arm member, which is effective for downsizing of the welding device. It is.

Electrodes before Symbol receiving hole is formed, Ru der intention to be used in any of the time when the projection bolt welding and projection nut welding.

  Since the electrode in which the receiving hole is formed is used for both bolt welding and nut welding, it is possible to avoid increasing the types of electrodes and to simplify the electrodes.

Before Symbol conversion mechanism includes a support member to the arm member is attached in a rotatable state, Ru der which the first electrode and the second electrode attached to the support member.

  Since the support member having the first electrode and the second electrode is rotatably attached to the arm member in this way, either the first electrode or the second electrode can be easily changed by simply rotating the support member. Can be selected. And since it is electrode selection by rotation operation, the coaxiality with a counterpart electrode can be reliably ensured by setting the rotation center of the support member at a predetermined location.

Before SL arm member, Ru pair of arm members der in C-type gun which is connected to the robotic device.

  As described above, since the C-type gun, that is, the welding apparatus is moved to a predetermined position by the robot apparatus, welding of a bolt or a nut to a required position can be easily performed selectively.

  Next, the best mode for carrying out the welding apparatus of the present invention will be described.

  1 to 5 show a first embodiment.

  The projection bolt will be described.

  There are various types of projection bolts, but the bolts in the first embodiment are as shown in FIGS. 3 and 5A. That is, the bolt 1 is made of iron, and is formed in a circular shape concentrically with the flange portion 2 on the opposite side of the shaft portion 2 from the shaft portion 2 on which the male screw is formed, the circular flange portion 3 integral with the shaft portion 2. It is comprised from the welding protrusion 4 made. As for the dimensions of each part, the diameter of the shaft part 2 is 5 mm, the length of the shaft part 2 is 23 mm, the diameter of the flange part 3 is 13 mm, the thickness of the flange part 3 is 1 mm, the diameter of the welding protrusion 4 is 9 mm, and welding The protrusion 4 has a protrusion thickness of 1.2 mm. The welding protrusion 4 may be a plurality of small protrusions.

  Next, the projection nut will be described.

  There are various types of projection nuts, but the nut in the first embodiment is as shown in FIGS. 4 and 5B. That is, the nut 5 is made of iron, and a screw hole 7 is formed at the center of the square-shaped main body 6, and welding protrusions 8 are formed at four corners on one side of the square main body. The square shape is a square when viewed from the axial direction of the screw hole 7. The dimensions of each part are such that one side of the square is 11 mm, the axial thickness of the screw hole 7 is 5 mm, and the inner diameter of the screw hole 7 is 5 mm.

  Next, the entire welding apparatus will be described.

  FIG. 1 is a side view showing the entire welding apparatus, FIG. 1A is a view seen from one side, and FIG. 1B is a view seen from the opposite side. This welding apparatus is of a C type gun type, a pair of arm members 10 and 11 are formed on a C type member 9, a movable electrode 12 is attached to the arm member 10, and a fixed electrode 13 is attached to the other arm member 11. Is installed. Reference numeral 14 denotes an air cylinder that moves the movable electrode 12 forward and backward, and is fixed to the arm member 10. This may be a forward / backward output type electric motor. Both electrodes 12 and 13 are disposed on the electrode axis OO. The fixed electrode 13 is an electrode name meaning that it does not move in the direction of the electrode axis OO.

  As described above, the arm members 10 and 11 are provided in the C-type gun type, but this may be used as a pair of arm members in a stationary welding apparatus. The bolt 1 and the nut 5 are welded to the steel plate part 15, and the steel plate part 15 is inserted between the electrodes 12 and 13.

  The fixed electrode 13 includes a first electrode 16 used when the bolt 1 is welded to the steel plate part 15 and a second electrode 17 used when the nut 5 is welded to the steel plate part 15. The first electrode 16 has a flat end surface 18, and the second electrode 17 has a guide pin 19 provided on the flat end surface. The guide pin 19 is raised at the center of the second electrode 17. The 1st electrode 16 and the 2nd electrode 17 are attached to the conversion mechanism 21 which can be changed into the position at the time of bolt welding, and the position at the time of nut welding alternately.

  As shown in FIG. 1A, a bolt supply device 23 is attached to the lateral side surface 22 of the arm member 10, whereby the bolt 1 is supplied to the movable electrode 12. As shown in FIG. 1B, a nut supply device 25 is attached to the other side surface 24 of the arm member 10, whereby the nut 5 is supplied to the second electrode 17. .

  Further, the C-shaped member 9 is coupled to the robot apparatus 26 via an equalizer 27. In addition, although only the arm at the end of the robot device 26 is illustrated, a generally used 6-axis type is used.

  Next, the movable electrode will be described.

  As shown in FIGS. 3, 4, and 5, a receiving hole 28 is formed in the center of the movable electrode 12 in a state of being coaxial with the electrode axis OO, and is open to the end surface of the movable electrode 12. The shaft portion 2 of the bolt 1 is inserted into the receiving hole 28. In order to prevent the inserted bolt 1 from falling, a permanent magnet 29 is fixed to the back of the receiving hole 28. Further, the movable electrode 12 is advanced and retracted by the air cylinder 14.

  Next, the bolt supply device will be described.

  In order to insert the bolt 1 into the receiving hole 28, a bolt supply device 23 shown in FIG. 1 (A) is provided. The bolt supply device 23 is of a type in which the bolt 1 is held in a holding head 34 that performs an advance / retreat operation in an oblique direction and an advance / retreat operation in an up / down direction, and is inserted into a receiving hole 28. The bolt supply rod 33 is advanced and retracted by the air cylinder 32 disposed in an oblique direction with respect to the electrode axis OO. A holding head 34 is attached to the tip of the bolt supply rod 33. A triangular bracket 35 is fixed to the air cylinder 32, a lifting air cylinder 36 is attached to the side surface 22 of the arm member 10, and its piston rod 37 advances and retreats in the same direction as the electrode axis OO. The bracket 35 is coupled to the lower end of the piston rod 37.

  As shown in FIG. 3, the holding head 34 is obtained by processing a block material made of stainless steel, which is a nonmagnetic material, and the flange portion 3 is accommodated in a circular accommodation hole 38 opened upward. An annular step portion 39 is formed in the accommodation hole 38, and the surface of the flange portion 3 is seated thereon. The attraction force of the permanent magnet 41 embedded in the holding head 34 acts on the flange portion 3 so that the seating is performed reliably.

  An air passage 42 opened at the bottom of the accommodation hole 38 is provided, and the air passage 42 communicates with an air switching valve and an air supply source (not shown) through the inside of the bolt supply rod 33.

  The bolt 1 is supplied from a parts feeder (not shown) through a supply hose 43 made of synthetic resin, and a supply pipe 44 made of stainless steel is connected thereto. As shown in FIG. 1, a state where the holding head 34 is aligned with the supply pipe 44 is a receiving position where the bolt 1 is transferred to the holding head 34.

  The holding head 34 advances by the operation of the air cylinder 32 and stops when the shaft portion 2 is coaxial with the receiving hole 28. This state is shown in FIG. Then, when the air cylinder 32, the bolt supply rod 33 and the holding head 34 are raised by the operation of the elevating air cylinder 36, the distal end portion of the shaft portion 2 enters the receiving hole 28. At this stage, compressed air is injected from the air passage 42, the bolt 1 is sent out from the receiving hole 38, the shaft portion 2 enters the receiving hole 28, and the flange portion 3 comes into close contact with the end face of the movable electrode 12.

  The above-described bolt supply device 23 is a type in which the bolt 1 is moved obliquely downward and then inserted into the receiving hole 28. However, as other bolt supply devices, the bolt 1 is lifted from obliquely below, and thereafter Alternatively, it may be inserted into the receiving hole 28. Alternatively, the bolt 1 can be moved from the side and then inserted into the receiving hole 28.

  If the bolt 1 transferred at high speed in the supply hose 43 directly collides with the holding head 34, the step portion 39 and the accommodation hole 38 in the holding head 34 may be damaged. In order to prevent such damage, a stopper unit 45 is provided in the middle of the supply pipe 44. The stopper unit 45 is fixed to the bracket 35. Although the internal structure of the stopper unit 45 is not shown in the drawing, a pass-through hole and a stop portion are provided in the advancing / retracting stopper piece, and the stopper piece moves after the bolt 1 transferred at high speed is temporarily stopped at the stop portion. Then, the bolt 1 passes through the passage hole and falls to the holding head 34 at a low speed.

  Next, the nut supply device will be described.

  In order to match the nut 5 with the guide pin 19, a nut supply device 25 shown in FIG. 1 (B) is provided. An air cylinder 46 is fixed to the lateral side surface 24 of the arm member 10 in an oblique direction. As shown in FIG. 4, a nut supply rod 48 that is advanced and retracted by the air cylinder 46 is supported in a guide tube 47 that is coupled to the air cylinder 46 so as to be able to advance and retract. The nut supply rod 48 is constituted by a guide rod 49 penetrating the screw hole 7, a sliding rod 50 having a larger diameter than that, and an extrusion surface 51 formed at a boundary portion between the rods 49 and 50.

  A stainless steel component supply pipe 53 is connected to a supply hose 52 extending from a parts feeder (not shown), and the component supply pipe 53 is welded to the guide pipe 47. The temporary fixing chamber 54 is formed by welding in this way. A thick plate-like stopper piece 55 is welded to the end of the guide tube 47 so as to form the inner surface of the temporary fixing chamber 54. In order to prevent the nut 5 received by the stopper piece 55 from dropping, a permanent magnet 56 is embedded in the stopper piece 55.

FIG. 4 shows a state where the nut 5 introduced into the temporary fixing chamber 54 is attracted to the stopper piece 55 by the permanent magnet 56 and is temporarily locked. In this state, the screw hole 7 and the guide rod 49 are coaxial. Here, when the nut supply rod 48 advances, the guide rod 49 penetrates the screw hole 7 like a skewer. When the pushing surface 51 hits the upper surface of the nut 5, the nut 5 is pushed out while sliding on the inner surface of the stopper piece 55 and matches the guide pin 19 as shown by a two-dot chain line in FIG. 4. In addition, a pilot hole 20 is previously formed in the steel plate part 15, and a guide pin 19 protrudes from the steel plate part 15 placed on the second electrode 17 . The protruding guide pin 19 penetrates relatively through the screw hole 7 of the nut 5.

  The nut supply device 25 is a so-called skewering method using a nut supply rod. However, as another type, the nut is held at the tip of the supply rod by a chuck or a permanent magnet so as to reach the guide pin 19. It is also possible to adopt a form in which the holding is released at that position.

  Next, the conversion mechanism will be described.

  The said conversion mechanism 21 fulfill | performs the function which converts into the position at the time of bolt welding and the position at the time of nut welding alternately the 1st electrode used when welding a bolt, and the 2nd electrode used when welding a nut. Is. Therefore, the first electrode and the second electrode can be converted by an advancing / retracting operation or by a rotating operation. Here, the latter is the rotary type.

  That is, the first electrode 16 and the second electrode 17 are attached to a support member 57 formed of an elongated member, and a rotary shaft 58 is attached to a central portion of both the electrodes 16 and 17, and the rotary shaft 58 is an arm member. 11 is supported in a state of penetrating through 11. The first electrode 16 and the second electrode 17 are arranged at an interval of 180 degrees, and are rotated by a rotation driving means 59 fixed to the lower side of the arm member 11. The rotation driving means 59 is formed by a step motor, a rotation output type air cylinder or the like. The axis of the rotary shaft 58 is disposed so as to be parallel to the electrode axis OO, whereby the first electrode 16 and the second electrode 17 are coaxial with the electrode axis OO.

  When the bolt 1 is welded to the steel plate part 15, the rotation driving means 59 operates so that the first electrode 16 is positioned on the electrode axis OO, and when the nut 5 is welded to the steel plate part 15, The rotation driving means 59 is operated so that the second electrode 17 is positioned on the electrode axis OO. A lock pin 60 is provided in order to prevent the electrode position on the electrode axis OO from deviating. The lock pin 60 is advanced and retracted by an air cylinder 61 attached to the arm member 11, and the lock function is achieved by the lock pin 60 entering the hole of the support member 57. In addition, the pad member 62 for electricity supply is fixed to the upper surface of the arm member 11, and this ensures the continuity at the time of electricity supply, and receives the load at the time of pressurization.

  FIG. 1A shows a state in which the bolt 1 is inserted into the receiving hole 28 by the bolt supply device 23, and in this state, the support member 57 is in a rotational position where the first electrode 16 matches the electrode axis OO. ing. FIG. 1B shows a state in which the nut 5 reaches the guide pin 19 by the nut supply device 25. In this state, the support member 57 is in a rotational position where the second electrode 17 matches the electrode axis OO. It has become.

  As shown in FIG. 1, when the movable electrode 12 is pressed against the upper surface of the steel plate part 15, the equalizer 27 is connected to the C-shaped member 9 and the robot so that the fixed electrode 13 is pressed against the lower surface of the steel plate part 15. It is interposed between the device 26. The equalizer 27 is a mechanism that is generally used. A protruding piece 63 fixed to the C-shaped member 9 is inserted into a U-shaped member 64 fixed to the robot device 26, and The installed guide rod 65 penetrates the protruding piece 63 in a slidable state. And the compression coil springs 66 and 67 are inserted in the compressed state above and below the projecting piece 63, respectively.

  With the above-described structure, when the movable electrode 12 is pressed against the upper surface of the steel plate part 15, the projecting piece 63 slides on the guide rod 65 by the reaction force, and any one of the compression coil springs 66 or 67 is reduced and fixed. The electrode 13 is pressed against the lower surface of the steel plate part 15. With such an operation, the bolt 1 or the nut 5 is pressed against the steel plate part 15 between the electrodes 12 and 13, and a welding current is applied to perform electric resistance welding.

  As described above, the receiving hole 28 is provided in the movable electrode 12, but the receiving hole 28 may be provided in the fixed electrode 13. In that case, the holding head 34 of the bolt supply device 23 is arranged upside down, the bolt 1 is inserted into the fixed electrode 13 side by the lifting air cylinder 36, and then the steel plate part 15 is inserted between the electrodes 12 and 13. To do. In this case, the receiving hole 28 of the movable electrode 12 is filled, and the nut 5 is also welded by the movable electrode 12 as described later.

  Although various air cylinders are employed in the above-described embodiments, an electric motor that performs forward / backward output may be employed instead. Further, in order to perform the operation as described above, although not shown, it is easily performed using a control device such as a normal sequencer, a sensor, an air switching valve operated by the control device, or the like. Can do.

  FIG. 5 is a cross-sectional view showing a state in which the bolt 1 and the nut 5 are welded by one type of movable electrode 12. As shown in FIG. 5B, the nut 5 is welded using the same movable electrode 12. In this case, since the tip of the guide pin 19 enters the receiving hole 28, the guide pin 19 is prevented from interfering with the lower end surface of the movable electrode 28. At the same time, since the opening of the receiving hole 28 matches the screw hole 7, there is no shortage in the contact area of the movable electrode 12 required for energizing the nut 5. Note that a hole for receiving the guide pin 19 is provided even when the receiving hole 28 of the movable electrode 12 is filled as described above.

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

  When the shaft portion 2 of the bolt 1 is inserted into the receiving hole 28 and the bolt 1 is welded to the steel plate part 15, the conversion mechanism 21 operates to place the first electrode 16 at a predetermined position on the electrode axis OO. Positioned. Then, the bolt 1 is pressed against the steel plate part 15, and a welding current is further applied to complete the welding. Further, when the nut 5 is welded to the steel plate part 15, the conversion mechanism 21 operates to position the second electrode 17 at a predetermined location on the electrode axis OO. Next, the steel plate part 15 is set on the guide pin 19, and the nut 5 is held on the guide pin 19. Thereafter, the nut 5 is pressed against the steel plate part 15, and a welding current is applied to complete the welding.

  As described above, the first electrode 16 suitable for bolt welding is positioned at a predetermined position on the electrode axis OO, and the second electrode 17 suitable for the nut welding is positioned on the electrode axis OO during nut welding. It is positioned at a predetermined location. That is, the counterpart electrode adapted when welding the bolt 1 or the nut 5 can be selected by the conversion mechanism 21. Therefore, the welding function of the bolt 1 and the nut 5 can be held in a single welding apparatus, and the multifunction of the welding apparatus itself is achieved, thereby simplifying the welding equipment.

  In addition to the two types of components such as the bolt 1 and the nut 5, for example, a third electrode for welding a component such as an annular distance piece can be arranged in the conversion mechanism 21, thereby Multifunctionalization of the welding apparatus can be further promoted.

  A bolt supply device 23 is attached to the arm member 10, and the bolt supply device 23 is moved from the state where the bolt supply rod 33 holding the bolt 1 is advanced and the shaft portion 2 is coaxial with the electrode axis OO. The shaft portion 2 is inserted into the receiving hole 28.

  Since the bolt supply device 23 is attached to the arm member 10, the distance between the bolt supply device 23 and the receiving hole 28 is shortened, and the bolt supply to the receiving hole 28 can be reliably performed in a short time. Since the bolt 1 is inserted into the receiving hole 28 after the bolt shaft 2 and the electrode axis OO are matched by the operation of the bolt supply rod 33, the moving path of the bolt 1 is simplified and the bolt 1 is moved to the receiving hole 28. Bolt supply is ensured.

A nut supply device 25 is attached to the arm member 10 , and the nut supply rod 48 that holds the nut 5 advances, and the guide pin 19 penetrates the screw hole 7 of the nut 5 relatively. To do.

Since the nut supply device 25 is attached to the arm member 10 , the distance between the nut supply device 25 and the guide pin 19 is shortened, and the nut supply to the guide pin 19 can be reliably performed in a short time. Since the nut 5 can be directly supplied to the guide pin 19 by the operation of the nut supply rod 48, the nut supply to the guide pin 19 is ensured.

  A bolt supply device 23 is attached to the lateral side surface 22 on one side of the arm member 10, and a nut supply device 25 is attached to the lateral side surface 24 on the other side of the arm member 10.

  As described above, since the bolt supply device 23 and the nut supply device 25 are attached to both the lateral side surfaces 22 and 24 of the arm member 10, respectively, the both supply devices 23 and 25 can be arranged compactly on the arm member 10. This is effective for reducing the size of the welding apparatus.

  The electrode 12 in which the receiving hole 28 is formed is used in both bolt welding and nut welding.

  Since the electrode 12 in which the receiving hole 28 is formed is used for both bolt welding and nut welding, it is possible to avoid increasing the types of electrodes and to simplify the electrodes.

  The conversion mechanism 21 is attached to the arm member 11 with a support member 57 being rotatable, and the first electrode 16 and the second electrode 17 are attached to the support member 57.

  Since the support member 57 having the first electrode 16 and the second electrode 17 is rotatably attached to the arm member 11 as described above, the first electrode 16 or the second electrode 17 can be operated simply by rotating the support member 57. Any of the electrodes can be easily selected. Since the electrode selection is based on the rotational operation, the coaxiality with the counterpart movable electrode 12 can be ensured by setting the rotation center of the support member 57 at a predetermined location.

  The arm members 10 and 11 are a pair of arm members in the C-shaped member 9 connected to the robot apparatus 26.

  As described above, since the C-shaped member 9, that is, the welding apparatus, is moved to a predetermined location by the robot device 26, the welding of the bolt 1 and the nut 5 to the required location is selectively and easily performed.

  FIG. 6 shows a second embodiment.

  In the second embodiment, the conversion mechanism 21 in the first embodiment is modified. In the first embodiment, the axis of the rotary shaft 58 is parallel to the electrode axis OO, but in this second embodiment, the axis of the rotary shaft 58 is perpendicular to the electrode axis OO. For this purpose, a bearing piece 68 is formed at the tip of the arm member 11, and the rotating shaft 58 is supported there in a direction that is perpendicular to the electrode axis OO. 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 support member 57 is rotated by the operation of the rotation driving means 59 so that the first electrode 16 is located at the upper position and faces the movable electrode 12, or the second electrode 17 is located at the upper position and faces the movable electrode 12. To do. In this way, the first electrode 16 and the second electrode 17 are selectively moved. Other functions and effects are the same as those of the first embodiment.

  As described above, according to the present invention, a steel plate part can be inserted between the electrodes, and a part such as a projection bolt or a projection nut can be selectively welded by electric resistance welding. A plurality of welding functions can be provided, and it can be used in a wide range of industrial fields such as a car body welding process for automobiles and a sheet metal welding process for home appliances.

It is the side view and partial top view of a welding apparatus. It is a front view of a welding apparatus. It is sectional drawing of a movable electrode and a holding head. It is sectional drawing of a nut supply apparatus. It is sectional drawing of a movable electrode. It is a side view of the conversion mechanism of another form.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projection bolt 2 Shaft part 3 Flange part 4 Welding protrusion 5 Projection nut 6 Main body 7 Screw hole 8 Welding protrusion 9 C-type member 10 Arm member 11 Arm member 12 Movable electrode 13 Fixed electrode 15 Steel plate part 16 1st electrode 17 1st electrode 17 2 electrode 19 guide pin 21 conversion mechanism 22 lateral surface 23 bolt supply device 24 lateral surface 25 nut supply device 28 receiving hole 33 bolt supply rod 34 holding head 36 lift air cylinder 45 stopper unit 48 nut supply rod 57 support member 58 rotating shaft 68 Bearing piece

Claims (1)

A movable electrode and a fixed electrode arranged on the electrode axis are attached to a pair of arm members, and a steel plate component is inserted between the movable electrode and the fixed electrode , and a component such as a projection bolt or a projection nut is inserted into the steel plate component. the in what form the welding electric resistance welding, the receiving hole the shaft portion of the projection bolt is inserted into the movable electrode is formed, the fixed electrode forming the movable electrode and the counter, when welding the projection bolt A first electrode having a flat end face and a second electrode having a guide pin provided on the end face used when welding the projection nut are used. The first electrode and the second electrode are positioned at the time of projection bolt welding. It is attached to a conversion mechanism that can alternately convert to the position at the time of projection nut welding.
A bolt supply device is attached to one side surface of the arm member to which the movable electrode is attached, and a nut supply device is attached to the other side surface of the arm member to which the movable electrode is attached . A bolt supply rod is disposed in an oblique direction with respect to the electrode axis, and a nut supply rod of the nut supply device is disposed in an oblique direction with respect to the electrode axis;
In the conversion mechanism, the first electrode and the second electrode are attached to a support member formed of an elongated member, and a rotation shaft is attached to a support member at a central portion of both electrodes, and the rotation shaft is fixed to the fixing member. The rotary shaft is supported by a penetrating arm member to which the electrode is attached, and is configured to rotate by a rotation driving means fixed to the lower side of the arm member. The axis of the rotary shaft is parallel to the electrode axis. It is arranged so that it may become.

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