JP2009061497A - Method and device for feeding hollow component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for feeding a hollow component where inserting thrust to a receiving hole is acted on the tip side of a hollow component, and the hollow component can be smoothly inserted into the receiving hole. <P>SOLUTION: A hollow component 1 in which one end of a hollow part 11 is provided with an opening part 12 and the other end is provided with a closed part 8 is used as an object for feeding. Then, the hollow component 1 is held to a head member 32 fitted to the tip of a feed rod 14 performing a progressing/retreading operation , and it is inserted into a receiving hole 18 as an objective place. At the point of time in which the head member 32 is moved to the receiving hole 18 and a part of the hollow component 1 is inserted into the receiving hole 18, air injection is performed from an air injection port 39 provided at the head member 32 toward the closed part 8, and the hollow component 1 is inserted into the prescribed position of the receiving hole 18. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for supplying a hollow part to a receiving hole such as an electric resistance welding electrode.

It is known to insert a shaft-like component such as a projection bolt into a receiving hole provided in an electric resistance welding electrode by air injection.
Japanese Patent No. 3148846

  The technique disclosed in Patent Document 1 is a type in which the rear of the projection bolt is pushed by the injected air and is pushed into the receiving hole of the electrode. Therefore, since the tip of the bolt swings left and right, there is a problem that the bolt tip is rubbed against the inner surface of the receiving hole and smooth insertion is not ensured.

  The present invention is provided in order to solve the above-described problems. Supply of a hollow part that can be smoothly inserted into the receiving hole by causing the insertion thrust to the receiving hole to act on the distal end side of the hollow part. The object is to provide a method and a supply device.

Means to solve the problem

  The invention according to claim 1 is an invention relating to a supply method, wherein the tip of a supply rod that moves forward and backward is intended for supply of a hollow part in which an opening is provided at one end of the hollow part and a closing part is provided at the other end. The hollow part is held by the head member attached to the head member and inserted into a receiving hole which is a target location, and the head member is moved toward the receiving hole to insert a part of the hollow part into the receiving hole. A method for supplying a hollow part, comprising: performing air injection from an air injection port provided in a head member toward the closing portion at a time and inserting the hollow part into a predetermined position of a receiving hole.

The invention's effect

  When a part of the hollow part is inserted into the receiving hole, air injection is performed from the air injection port provided in the head member toward the closing part. Works. That is, the insertion thrust is applied in such a state that the distal end portion in the moving direction of the hollow part is pulled toward the back of the receiving hole. Therefore, since the phenomenon that the tip of the hollow part swings in the diameter direction of the receiving hole is minimized, the hollow part is smoothly inserted into the receiving hole, and problems such as catching do not occur. That is, since air is injected from the opening of the hollow portion toward the closing portion located on the distal end side of the insertion, such a favorable phenomenon is ensured.

  Also, since the hollow structure of the hollow part is used to inject air from the rear of the hollow part to generate traction force at the tip of the hollow part, a simple structure in which an air injection port is provided in the head member is adopted. This is effective in terms of simplification of the structure.

  According to a second aspect of the present invention, the hollow part is welded to a steel plate part by electric resistance welding, and the receiving hole is provided in an electrode that moves forward and backward. Is the method.

  In this way, when the hollow part is welded to the steel plate part by electric resistance welding, the hollow part is inserted into the receiving hole smoothly and in the correct posture, so when the electrode is advanced and welded, the hollow part is It is welded in the correct posture to the steel plate parts, and is effective in improving the welding accuracy.

  According to a third aspect of the present invention, in the hollow part according to the first or second aspect, the hollow part is formed by integrating a cover member in which the closing portion is formed on a projection nut having a welding projection. It is a supply method.

  Even in the case of a hollow part in which the cover member is integrated with the projection nut as described above, the hollow part is smoothly inserted into the receiving hole in a correct posture. It is welded and effective in improving welding accuracy.

  Invention of Claim 4 is what the top surface formed in the said closure part closely_contact | adheres to the conduction | electrical_connection surface formed in the back part of the said receiving hole. This is a method for supplying a hollow part.

  As described above, since the top surface is in close contact with the conduction surface, the current-carrying performance of the welding current is kept good, and the current-carrying state of the welded portion is properly maintained. Moreover, since the pressurizing force necessary for welding can be obtained with certainty, an appropriate pressurizing force is ensured and good welding quality is obtained.

  According to a fifth aspect of the present invention, the step formed on the outer peripheral portion of the hollow part is in close contact with the conduction surface formed on the peripheral edge of the opening of the receiving hole. A method for supplying a hollow part according to claim 1.

  Thus, since the said step part closely_contact | adheres to a conduction surface, the electroconductivity of welding current is maintained favorable and the energization state of a welding part is maintained appropriately. Moreover, since the pressurizing force necessary for welding can be obtained with certainty, an appropriate pressurizing force is ensured and good welding quality is obtained.

  The invention according to claim 6 is an invention relating to a supply device, and is intended to supply a hollow part in which a steel plate cover member having a closing portion is integrated with a projection nut, and is a supply rod that moves forward and backward. The head member attached to the tip of the hollow part is provided with a recess for holding the projection nut portion of the hollow part, and the recess is provided with an air injection port for injecting air toward the closing part. It is a supply device for hollow parts.

  The hollow part is a projection nut integrated with a steel plate cover member having a closed portion, and the projection nut part is received in the concave part of the head member, whereby the hollow part is stably held in the concave part. Is done. Therefore, even when the supply rod moves forward, the hollow part is correctly held at the predetermined position of the recess and does not shift. In this state, since air is injected from the air injection port toward the closed portion, the injection air pressure acts as an insertion thrust on the inside of the distal end portion in the moving direction of the hollow part. That is, the insertion thrust is applied in such a state that the front end of the hollow part is pulled. Therefore, it can be avoided that the phenomenon that the tip of the hollow part swings to the left and right is minimized and supplied to the target location, and that the position is out of position with respect to the target location.

  Also, since the hollow structure of the hollow part is used to inject air from the rear of the hollow part to generate traction force at the tip of the hollow part, a simple structure in which an air injection port is provided in the head member is adopted. This is effective in terms of simplification of the structure.

  The invention according to claim 7 is the hollow part supply device according to claim 6, wherein the mass of the projection nut is set larger than the mass of the cover member.

  Since the portion of the projection nut having a high mass is held in the concave portion, the projection nut is stably held in the concave portion, and the nut is not easily displaced even when the supply rod is advanced. Further, since air is injected inside the closed part of the cover member with a small mass, when the hollow part moves, it is minimal that the part with the large mass is located behind the movement and the tip of the hollow part swings to the left and right. It becomes. That is, since the portion having a large mass is pulled, the movement of the tip portion is reduced.

  The invention according to claim 8 is the hollow part supply apparatus according to claim 6 or 7, wherein the target location to which the hollow part is supplied is a receiving hole provided in an electrode of an electric resistance welding machine.

  Since the phenomenon that the tip of the hollow part swings in the diameter direction of the receiving hole of the electrode is minimized, the hollow part is smoothly inserted into the receiving hole, and problems such as catching do not occur. Thus, when the hollow part is welded to the steel plate part by electric resistance welding, the hollow part is inserted into the receiving hole smoothly and in the correct posture. The parts are welded in the correct posture, which is effective for improving the welding accuracy.

  A ninth aspect of the present invention is the hollow part supply apparatus according to the eighth aspect, wherein a suction means for preventing the hollow part from dropping is provided on a part of the electrode.

  When the electrode is moved downward in the vertical direction or moved in the horizontal direction, it is necessary to prevent the hollow part from dropping from the receiving hole or causing displacement. By providing the suction means in this way, the hollow part is held at a predetermined position of the receiving hole, so that when the electrode is advanced, the hollow part is correctly held at the correct position at the predetermined position of the counterpart member. Welded.

  The invention according to claim 10 is the supply of the hollow part according to claim 8 or 9, wherein the top surface formed in the closing portion is in close contact with the conduction surface formed in the back portion of the receiving hole. Device.

  As described above, since the top surface is in close contact with the conduction surface, the current-carrying performance of the welding current is kept good, and the current-carrying state of the welded portion is properly maintained. Moreover, since the pressurizing force necessary for welding can be obtained with certainty, an appropriate pressurizing force is ensured and good welding quality is obtained.

  In the invention described in claim 11, the step portion formed in the outer peripheral portion of the hollow part is in close contact with the conduction surface formed in the periphery of the opening portion of the receiving hole. It is a supply device for hollow parts.

  Thus, since the said step part closely_contact | adheres to a conduction surface, the electroconductivity of welding current is maintained favorable and the energization state of a welding part is maintained appropriately. Moreover, since the pressurizing force necessary for welding can be obtained with certainty, an appropriate pressurizing force is ensured and good welding quality is obtained.

  Next, the best mode for carrying out the method and apparatus for supplying a hollow part of the present invention will be described.

  1 to 5 show a first embodiment.

  First, the shape of the hollow part will be described.

  8A and 8B are a side view and a plan view in which a part of the hollow part 1 is broken. The hollow part 1 here is obtained by welding a hexagonal iron projection nut 2 to a cover member 3 made of a steel plate, and is generally called a cap nut. The projection nut 2 is formed with a circular flange 4 at its end, and three welding projections 5 are formed at 120 ° intervals on the same circumference. The projection nut 2 is formed from a solid material, and the cover member 3 is formed by pressing a steel plate. The mass of the projection nut 2 is set larger than the mass of the cover member 3 by such a method of making.

  The cover member 3 has a straight cylindrical shape, and the diameter thereof is smaller than the outer diameter of the projection nut 2. Due to such a diameter difference, an annular step 6 is formed on the outer periphery of the hollow part 1. The upper surface of the flange 4 is also an annular step 7. The end portion of the cover member 3 is a closing portion 8 and the top surface 9 is a flat surface. A small hole 10 is provided on the top surface, which is a paint discharge hole for electrodeposition coating. As will be described later, air is injected toward the closing portion 8, but since the flow path area of the small hole 10 is extremely small, air leakage is slight, and the thrust of supply by air injection is not reduced.

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

  The dimensions of the hollow part 1 described above are as follows. The outer diameter of the nut 2 (the dimension between the corners) is 18 mm, the inner diameter of the screw hole is 10 mm, the diameter of the flange 4 is 20 mm, the height of the nut 2 is 11 mm, The outer diameter is 11 mm, and the height of the hollow part 1 is 23 mm. The hollow portion 11 is formed by the space of the screw hole and the internal space of the cover member 3, and the opening end of the screw hole is the opening portion 12 of the hollow portion 11.

  The hollow part 1 is not a so-called cap nut as described above, but may be as shown in FIG. This is a cylindrical type, and a hollow portion 11 is formed by a two-stage hole, a closing portion 8 is formed at the back of the hollow portion 11, and the other end is an opening portion 12.

  Next, a system apparatus to which the present invention is applied will be described.

  FIG. 1 shows the entire system apparatus. A supply head 15 is attached to the tip of the supply rod 14 that moves forward and backward, and the hollow part 1 is held here. The movable electrode 16 and the fixed electrode 17 of the electric resistance welder are coaxially arranged, and the movable electrode 16 is advanced and retracted by advancing and retracting drive means 31 such as an air cylinder as shown in FIG. A receiving hole 18 for receiving the cover member 3 is provided in the central portion of the end surface of the movable electrode 16, and a permanent magnet 19, which is a suction means, is fixed behind the receiving hole 18.

  On the other hand, a steel plate component 20 is placed on the upper surface of the fixed electrode 17 and a positioning pin 21 provided on the fixed electrode 17 passes therethrough.

  Various means can be employed as the advancing / retreating drive means for the supply rod 14, but here the air cylinder 22 is used. Elevating drive means for elevating and lowering the air cylinder 22 in a direction parallel to the electrode axis OO is provided. Various devices can be used as the raising / lowering driving means, but here the air cylinder 23 is used. The air cylinder 23 is fixed to a stationary member 13 such as a machine frame. A piston rod 25 of the air cylinder 23 is coupled to a bracket 24 fixed to the air cylinder 22.

  The air cylinder 22 is provided with an inclination of about 45 degrees. As shown in the two-dot chain line, the supply rod 14 advances and the hollow part 1 is coaxial with the electrode axis OO, that is, coaxial with the receiving hole 18. Advancement stops at the point. Thereafter, when the air cylinder 23 is operated and the supply head 15 is moved toward the receiving hole, the cover member 3 is inserted into the receiving hole 18 and the hollow part 1 is further inserted into the receiving hole at a predetermined position by air jet described later. And then held in the receiving hole 18 by the permanent magnet 19. Thereafter, when the supply rod 14 moves backward in the opposite direction, the movable electrode 16 advances and the projection nut 2 is welded to the steel plate part 20.

  The hollow part 1 is supplied from a parts feeder 26, and is supplied to the supply head 15 via a supply hose 27 made of urethane resin and an impact mitigation device 28 extending therefrom. The impact mitigating device 28 is coupled to the air cylinder 22 via a bracket 29. An air cylinder 30 that operates the impact mitigating device 28 is fixed to the bracket 29.

  In the impact mitigating device 28, when the hollow part 1 transferred from the parts feeder 26 collides with the supply head 15, the supply head 15 is damaged. To be transferred. As shown in FIG. 2, a solid stop portion 55 and a passage hole 56 are provided in the control member 54 that is advanced and retracted by the air cylinder 30. The state shown in the figure is a state in which the hollow part 1 is stopped by the stop portion 55. When the control member 54 moves and the passage hole 56 communicates with the supply hose 27 and the supply pipe 57, the hollow part 1 falls. And received by the supply head 15.

  Next, the structure of the supply head will be described.

  The supply head 15 shown in FIGS. 2, 3 and 4 will be described. The supply head 15 is mainly formed by a head member 32, and the supply rod 14 is screwed and connected to a connection pipe 36 provided integrally therewith. An annular member 33 is formed on the upper surface of the head member 32, and the inside thereof is a circular recess 34. The cross-sectional area of the concave portion 34 is set so as to gradually increase toward the opening side, and therefore a tapered portion 35 is formed.

  An air passage 37 provided at the center of the supply rod 14 is continuous with an air passage 38 provided in the head member 32. An air injection port 39 is opened at the center of the bottom of the recess 34, and air from the air passage 38 is injected from the air injection port 39. This blast air flows into the hollow portion 11 from the opening portion 12 of the screw hole, and as shown by the arrow lines in FIGS. 3 and 4, the inner surface of the closing portion 8 is directly hit. For this reason, the hollow part 1 is in a state in which an insertion thrust acts on the distal end portion in the transfer direction, and is inserted into the receiving hole 18.

  In the case shown in FIG. 3, since the energization location of the welding current is the step portion 7, the conductive surface 41 of the movable electrode 16 is in the step portion 7 when the hollow part 1 is completely inserted into the receiving hole 18. It comes to adhere closely. The conducting surface 41 is an annular surface formed on the periphery of the opening of the receiving hole 18. In order to reliably establish the close contact, even when the hollow part 1 is completely inserted, the gap L1 is present between the top surface 9 and the inner end surface 42 of the back portion of the receiving hole 18. The dimensions are set. Therefore, immediately before the completion of insertion shown in FIG. 3, the interval L2 between the conductive surface 41 and the stepped portion 7 is set smaller than the L1.

  In the case shown in FIG. 4, since the energization location of the welding current is the step portion 6, the conductive surface 41 of the movable electrode 16 becomes the step portion 6 when the hollow part 1 is completely inserted into the receiving hole 18. It comes to adhere closely. In order to reliably establish the close contact, even when the hollow part 1 is completely inserted, the gap L1 is present between the top surface 9 and the inner end surface 42 of the back portion of the receiving hole 18. The dimensions are set. Therefore, immediately before the completion of insertion shown in FIG. 4, the interval L2 between the conductive surface 41 and the stepped portion 6 is set smaller than the L1.

  3 shows that the supply rod 14 advances and retreats in an oblique direction, and FIG. 4 shows that the supply rod 14 advances and retreats in the horizontal direction.

  Next, the movable electrode will be described.

  Other than the structural part already described, it is as follows. 3 and 4, a permanent magnet 19 serving as a suction means is embedded in the back of the receiving hole 18. As shown in FIG. 5, the top surface 9 of the hollow part 1 and the inner end surface 42 of the hollow part 1 are brought into close contact with each other to replace the one in which the conduction surface 41 is in close contact with the stepped portions 6 and 7 and energizes the welding current. You can also In this case, as shown in FIG. 5, a current-carrying chip 44 is constituted by a circular thick plate made of chrome copper and is brought into close contact with the end portion of the movable electrode body 46. The energization tip 44 is integrated with the movable electrode body 46 when the cylindrical member 45 is coupled to the movable electrode body 46 with a screw structure or the like. In the case of such a structure, the permanent magnet 19 which is an attraction means is embedded in the cylindrical member 45. 3 and 4, the cylindrical member 45 is screwed.

  As described above, since the top surface 9 of the hollow part 1 and the back inner end surface 42 are brought into close contact with each other and energized, the back inner end surface 42 is a conduction surface 42 denoted by the same reference numeral. Therefore, in this case, as shown in FIG. 5, the dimensions of the respective parts are set so that a gap L3 is formed between the stepped portion 6 and the conductive surface 41 in a state where the top surface 9 is in close contact with the conductive surface 42. ing.

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

  When a part of the hollow part 1 is inserted into the receiving hole 18, air is ejected from the air ejection port 39 provided in the head member 32 toward the closing portion 8. Insertion thrust acts on the inside of the unit. That is, the insertion thrust is applied in such a state that the distal end portion in the moving direction of the hollow part 1 is pulled toward the back of the receiving hole 18. Therefore, since the phenomenon that the tip of the hollow part 1 swings in the diameter direction of the receiving hole 18 is minimized, the hollow part 1 is smoothly inserted into the receiving hole 18, and problems such as catching do not occur. That is, since air is injected from the opening 12 of the hollow portion 11 toward the closing portion 8 located on the distal end side of the insertion, such a favorable phenomenon is ensured.

  Further, since the hollow structure of the hollow part 1 is used to inject air from the rear of the hollow part 1 to generate a traction force at the tip of the hollow part 1, the air injection port 39 is provided in the head member 32. It is possible to adopt a simple structure, which is effective in terms of simplifying the structure.

  The hollow part 1 is welded to the steel plate part 20 by electric resistance welding, and the receiving hole 18 is provided in the movable electrode 16 that moves forward and backward.

  In this way, when the projection nut 2 portion of the hollow part 1 is welded to the steel plate part 20 by electric resistance welding, the hollow part 1 is smoothly inserted into the receiving hole 18 in a correct posture. When advancing and welding is performed, the hollow part 1 is welded to the steel plate part 20 in a correct posture, which is effective in improving the welding accuracy.

  The hollow part 1 is a projection nut 2 having a welding projection 5 and a cover member 3 in which the closing portion 8 is formed integrated by welding.

  Even if the hollow part 1 has the cover member 3 welded to the projection nut 2 as described above, the hollow part 1 is smoothly inserted into the receiving hole 18 in a correct posture. On the other hand, it is welded in the correct posture, which is effective in improving the welding accuracy.

  The top surface 9 formed in the closing portion 8 is in close contact with the conduction surface 42 formed in the back portion of the receiving hole 18.

  Since the top surface 9 is in close contact with the conduction surface 42 in this way, the welding current is maintained in good conductivity, and the current-carrying state of the welded portion is properly maintained. Moreover, since the pressurizing force necessary for welding can be obtained with certainty, an appropriate pressurizing force is ensured and good welding quality is obtained.

  Step portions 6 and 7 formed on the outer peripheral portion of the hollow part 1 are in close contact with the conduction surface 41 formed on the periphery of the opening of the receiving hole 18.

  As described above, since the stepped portions 6 and 7 are in close contact with the conduction surface 41, the current-carrying property of the welding portion is maintained and the current-carrying state of the welded portion is properly maintained. Moreover, since the pressurizing force necessary for welding can be obtained with certainty, an appropriate pressurizing force is ensured and good welding quality is obtained.

  As a supply device, a hollow part 1 in which a steel plate cover member 3 having a closing portion 8 is integrated with a projection nut 2 by welding is supplied, and the supply rod 14 is moved forward and backward. The attached head member 32 is provided with a recess 34 for holding the projection nut 2 portion of the hollow part 1, and an air injection port 39 for injecting air toward the closing portion 8 is provided in the recess 34.

  The hollow part 1 is formed by welding a steel plate cover member 3 having a closing portion 8 to a projection nut 2, and a portion of the projection nut 2 is received in a recess 34 of a head member 32, whereby the hollow part 1. Is held in the recess 34 with good stability. Therefore, even when the supply rod 14 moves forward, the hollow part 1 is correctly held at a predetermined position of the recess 34 and does not cause a positional shift. In this state, since air is injected from the air injection port 39 toward the closing portion 8, the injection air pressure acts as an insertion thrust on the inside of the distal end portion in the moving direction of the hollow part 1. That is, the insertion thrust is applied in such a state that the front end of the hollow part 1 in the moving direction is pulled. Therefore, the hollow part 1 is supplied to the receiving hole 18 which is a target position in a state in which the phenomenon that the tip of the hollow part 1 swings to the left and right is minimized, and is supplied in a state where the position is out of position with respect to the receiving hole 18. Can be avoided.

  Further, since the hollow structure of the hollow part 1 is used to inject air from the rear of the hollow part 1 to generate a traction force at the tip of the hollow part 1, the air injection port 39 is provided in the head member 32. It is possible to adopt a simple structure, which is effective in terms of simplifying the structure.

  The mass of the projection nut 2 is set larger than the mass of the cover member 3.

  Since the portion of the projection nut 2 having a high mass is held in the concave portion 34, the projection nut 2 is stably held in the concave portion 34, and the nut 2 is not easily displaced even when the supply rod 14 is advanced. Furthermore, since air is injected into the inside of the closed portion 8 of the cover member 3 having a small mass, when the hollow component 1 moves, a portion of the nut having a large mass is positioned at the rear of the movement and the tip of the hollow component 1 is moved. Is minimized from side to side. That is, since the portion having a large mass is pulled, the movement of the tip portion is reduced.

  The target location to which the hollow part 1 is supplied is a receiving hole 18 provided in the operation 16 electrode of the electric resistance welding machine.

  Since the phenomenon in which the tip of the hollow part 1 swings in the diameter direction of the receiving hole 18 of the movable electrode 16 is minimized, the hollow part 1 is smoothly inserted into the receiving hole 18, causing problems such as catching. Does not occur. In this way, when the hollow part 1 is welded to the steel plate part 20 by electric resistance welding, the hollow part 1 is smoothly inserted into the receiving hole 18 in a correct posture, so that the movable electrode 16 advances and welding is performed. Sometimes, the hollow part 1 is welded to the steel sheet part 20 in a correct posture, which is effective in improving the welding accuracy.

  A suction means for preventing the hollow part 1 from dropping, that is, a permanent magnet 19 is provided on a part of the movable electrode 16.

  When moving the movable electrode 16 vertically downward or horizontally, it is necessary to prevent the hollow part 13 from dropping from the receiving hole 18 or causing a displacement. Since the hollow part 1 is held at a predetermined position of the receiving hole 18 by providing the permanent magnet 19 as described above, the steel plate part 20 is held in a state where the hollow part 1 is held at a correct position when the movable electrode advances. It is correctly welded in place.

  The top surface 9 formed in the closing portion 8 is in close contact with the conduction surface 42 formed in the back portion of the receiving hole 18.

  Since the top surface 9 is in close contact with the conduction surface 42 in this way, the welding current is maintained in good conductivity, and the current-carrying state of the welded portion is properly maintained. Moreover, since the pressurizing force necessary for welding can be obtained with certainty, an appropriate pressurizing force is ensured and good welding quality is obtained.

  Step portions 6 and 7 formed on the outer peripheral portion of the hollow part 1 are in close contact with the conduction surface 41 formed on the periphery of the opening of the receiving hole 18.

  As described above, since the stepped portions 6 and 7 are in close contact with the conduction surface 41, the current-carrying property of the welding portion is maintained and the current-carrying state of the welded portion is properly maintained. Moreover, since the pressurizing force necessary for welding can be obtained with certainty, an appropriate pressurizing force is ensured and good welding quality is obtained.

  6 and 7 show a second embodiment.

  First, the guide member will be described.

  In the second embodiment, a guide member 48 that matches the inside of the hollow portion 11 of the hollow part 1 is provided at the center of the head member 32, and is arranged coaxially with the central axis 49 of the circular recess 34. . Various shapes of the guide member 48 are selected according to the space shape of the hollow portion 11. Here, the guide member 48 is a guide pin-like member having a circular cross section, and its tip portion is spherical. The central axis 50 of the guide member 48 and the central axis 49 of the recess 34 are coaxial. These axes 49 and 50 are coaxial with the electrode axis OO when the supply rod 14 is advanced, and therefore the advancing and retracting direction of the air cylinder 23 is parallel to the axes 49 and 50.

  The relative position between the head member 32 and the hollow part 1 is set by the positional relationship between the inner surface of the recess 34 and the outer surface of the hollow part 1 or the positional relationship between the inner surface of the hollow part 11 and the outer surface of the guide member 48. It has become. Thus, the guide member 48 functions as a positioning member, or the inner surface of the recess 34 functions as a positioning member.

  The guide member 48 is screwed into the head member 32, and an air injection port 51 communicating with the air passage 38 is provided at the center of the guide member 48, and the air from here is injected in the directions of the axes 49, 50, OO. Is done. A ring-shaped permanent magnet 52 is embedded in the guide member 48, and an air passage to the air injection port 51 passes through the permanent magnet 52. The permanent magnet 52 is a suction means for holding the hollow part 1 in the recess 34. This permanent magnet may be embedded in the head member 32 as shown by a chain line in FIG. It is also possible to hold the hollow part 1 with air vacuum by opening an air suction port at the bottom of the recess 34 instead of the permanent magnet 52.

  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.

  FIG. 6A shows a state in which the supply rod 14 has advanced and the axis of the hollow part 1 is coaxial with the axis of the receiving hole 18. From this state, when the head member 32 moves in the direction of the electrode axis OO and the cover member 3 is inserted into the receiving hole 18 over a predetermined length, air is injected from the air injection port 51 and the hollow part 1 is inserted. Is completed. The subsequent welding process is the same as in Example 1.

  The example of FIG. 7 is a case where the installation of the recess 34 as shown in FIG. The rest of the configuration is the same as that of FIG. 6A and the first embodiment including parts not shown, and members having the same functions are denoted by the same reference numerals.

  In addition, it can replace with the air cylinder in each said Example, and can also employ | adopt the electric motor which performs advancing / retreating output.

  Operations such as the advance / retreat of the supply rod 14, the advance / retreat of the air cylinder 23, and the air injection can be easily performed by operating the air switching valve by a control device or a sequence circuit.

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

  The guide member 48 provided on the head member 32 matches, that is, enters into the hollow portion 11 of the hollow part 1. In such a state, the hollow part 1 having a hollow structure is securely held by the head member 32 by utilizing its structural characteristics. Therefore, even if the supply rod 14 moves forward, the hollow part 1 is held by the head member 32 without dropping or being displaced, and the supply to the receiving hole 18 that is the target location is accurately performed. Further, since the guide member 48 is attached to the head member 32, the structure as the supply head 15 is greatly simplified.

  The head member 32 is formed with a recess 34 for accommodating the hollow part 1.

  The hollow part 1 is held by the guide member 48 and is held in the recessed portion 34. Therefore, the holding state of the hollow part 1 is performed both inside and outside the hollow part 1, and the holding state is highly reliable and stable.

  The sectional area of the concave portion 34 is set so as to gradually increase toward the opening side, and the guide member 48 relatively enters the hollow portion 11 when the hollow component 1 is inserted into the concave portion 34. It fulfills its function.

  Since the opening side of the concave portion 34 has an expanded shape, the hollow component 1 can enter smoothly when entering the concave portion 34. In this transitional period, the guide member 48 relatively enters the hollow portion 11 and performs a guiding function, so that the hollow component 1 is reliably introduced into a predetermined position of the recess 34. Therefore, the holding position of the hollow part 1 with respect to the supply head 15 is set to a predetermined position, and the supply accuracy with respect to the receiving hole 18 is improved.

  The relative position between the head member 32 and the hollow part 1 is set by the positional relationship between the inner surface of the recess 34 and the outer surface of the hollow part 1 or the positional relationship between the inner surface of the hollow part 11 and the outer surface of the guide member 48. It is configured.

  By optimizing the positional relationship between the inner surface of the concave portion 34 and the outer surface of the hollow part 1 as described above or the positional relationship between the inner surface of the hollow portion 1 and the outer surface of the guide member 48, that is, the gap between the inner and outer surfaces. And the relative position of the hollow part 1 can be set accurately. For this reason, the hollow part 1 can be accurately held at a predetermined position of the head member 32 and supplied to the receiving hole 18.

  The guide member 48 is provided with an air injection port 51 for injecting air into the hollow portion 11.

  Since air is injected from the air injection port 51 provided in the guide member 48 into the hollow portion 11, the injected air hits the closing portion 8, and the supply thrust acts on the inner side of the distal end portion in the moving direction of the hollow part 1. To do. That is, the supply thrust is applied in such a state that the front end of the hollow part 1 in the moving direction is pulled. Therefore, since the phenomenon that the tip of the hollow part 1 swings in the diametrical direction is minimized, the hollow part 1 is accurately supplied to the receiving hole 18 and does not cause problems such as catching. That is, since air is injected from the opening 12 of the hollow portion 11 toward the closing portion 8 located on the distal end side, such a favorable phenomenon is ensured.

  Further, since the hollow structure of the hollow part 1 is used to inject air from the rear of the hollow part 1 to generate a traction force at the tip of the hollow part 1, it is easy to provide the head member 32 with an air injection port. It is possible to adopt a simple structure, which is effective in simplifying the structure.

  The guide member 48 or the head member 32 is provided with a permanent magnet 52 (attraction means) that holds the hollow part 1 in the recess 34.

  Since the hollow part 1 is sucked by the suction means 52, the hollow part 1 is not displaced when the supply rod 14 advances. Further, when the hollow part 1 is held vertically downward or horizontally, it is necessary to prevent the hollow part 1 from dropping from the supply head 15 or causing displacement. . Since the hollow part 1 is held at a predetermined position of the supply head 15 by providing the permanent magnet 52 as described above, the movable electrode 16 is held in a state where the hollow part 1 is held at a correct position when the supply rod is advanced. Is properly supplied to a predetermined position.

  The central axis 49 of the recess 34 and the central axis 50 of the guide member 48 are coaxial, and the component supply movement of the head member 32 is set in the direction of these central axes.

  Since the central axis 49 of the recess 34 and the central axis 50 of the guide member 48 are coaxial, the hollow part 1 is guided by both the recess 34 and the guide member 48 and is smoothly held by the supply head 32. .

  In the case where the hollow member 1 is held by the head member 32 attached to the distal end portion of the supply rod 14 and is supplied to the receiving hole 18 which is the target location, the opening portion 12 is provided at one end of the hollow portion 11 and the closing portion is provided at the other end. The hollow part 1 provided with 8 is an object to be supplied, the head member 32 is formed with a recess 34 for accommodating the hollow part 1, and a guide member 48 that matches the hollow part 11 of the hollow part 1 is provided at the center thereof. The sectional area of the concave portion 34 is set so as to gradually increase toward the opening side, and the guide member 48 relatively enters the hollow portion 11 when the hollow component 1 is inserted into the concave portion 34. It is a supply head for hollow parts that fulfills a guide function and is provided with an air injection port 51 for injecting air into the hollow portion 11 in the guide member 48.

  The hollow part 1 is held by the guide member 48 and is held in the recessed portion 34. Therefore, the holding state of the hollow part 1 is performed both inside and outside the hollow part 1, and the holding state is highly reliable and stable.

  Since the opening side of the concave portion 34 has an expanded shape, the hollow component 1 can enter smoothly when entering the concave portion 34. In this transitional period, the guide member 48 relatively enters the hollow portion 11 and performs a guiding function, so that the hollow component 1 is reliably introduced into a predetermined position of the recess 34. Therefore, the holding position of the hollow part 1 with respect to the supply head 15 is set to a predetermined position, and the supply accuracy with respect to the receiving hole 18 which is the target location is improved.

  Since air is injected from the air injection port 51 provided in the guide member 48 into the hollow portion 11, the injected air hits the closing portion 8, and the supply thrust acts on the inner side of the distal end portion in the moving direction of the hollow part 1. To do. That is, the supply thrust is applied in such a state that the front end of the hollow part 1 in the moving direction is pulled. Therefore, since the phenomenon that the tip of the hollow part 1 swings in the diametrical direction is minimized, the hollow part 1 is accurately supplied to the receiving hole 18 and does not cause problems such as catching. That is, since air is injected from the opening 12 of the hollow portion 11 toward the closing portion 8 located on the distal end side, such a favorable phenomenon is ensured.

  Further, since the hollow structure of the hollow part 1 is used to inject air from the rear of the hollow part 1 to generate a traction force at the tip of the hollow part 1, it is easy to provide the head member 32 with an air injection port. It is possible to adopt a simple structure, which is effective in simplifying the structure.

  Other functions and effects are the same as those of the first embodiment.

  As described above, according to the present invention, the insertion thrust into the receiving hole can be applied to the distal end side of the hollow part and can be smoothly inserted into the receiving hole. Can be used in a wide range of industrial fields such as sheet metal welding processes.

It is a side view of the whole system apparatus. It is a side view which shows the components supply state by a supply rod. It is sectional drawing of a supply head and a movable electrode. It is sectional drawing of another supply head and a movable electrode. It is sectional drawing of a movable electrode. It is sectional drawing and a top view which show another supply head. It is sectional drawing which shows another supply head. It is sectional drawing and a top view of a hollow component.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hollow part 2 Projection nut 3 Cover member 4 Flange 5 Welding protrusion 6 Step part 7 Step part 8 Closure part 9 Top surface 11 Hollow part 12 Opening part 14 Supply rod 15 Supply head 16 Movable electrode 18 Receiving hole 19 Permanent magnet, Suction Means 20 Steel plate part OO Electrode axis 32 Head member 34 Recess 35 Tapered portion 39 Air injection port 41 Conducting surface 42 Inner end surface of inner surface, conductive surface 48 Guide member 49 Center axis of recess 50 Center axis 51 of guide member 51 Air injection port 52 Permanent magnet, suction means

Claims (11)

  A hollow part having an opening at one end of the hollow part and a closing part at the other end is supplied, and the hollow part is held by a head member attached to the tip of a supply rod that moves forward and backward. When the head member is moved toward the receiving hole and a part of the hollow part is inserted into the receiving hole, the air injection port provided in the head member is inserted into the closing portion. A method for supplying a hollow part, wherein the hollow part is inserted into a predetermined position of the receiving hole by performing air injection.   The method of supplying a hollow part according to claim 1, wherein the hollow part is welded to a steel plate part by electric resistance welding, and the receiving hole is provided in an electrode that moves forward and backward.   The method for supplying a hollow part according to claim 1 or 2, wherein the hollow part is formed by integrating a projection member having a welding projection and a cover member in which the closing portion is formed.   The method for supplying a hollow part according to any one of claims 1 to 3, wherein a top surface formed in the closed portion is in close contact with a conduction surface formed in a back portion of the receiving hole.   The supply of the hollow part according to any one of claims 1 to 3, wherein the step part formed on the outer peripheral part of the hollow part is in close contact with the conduction surface formed on the periphery of the opening part of the receiving hole. Method.   A hollow part in which a steel plate cover member having a closing portion is integrated with a projection nut is an object of supply, and the projection nut of the hollow part is attached to the head member attached to the tip of a supply rod that moves forward and backward. A hollow part supply apparatus, wherein a concave portion for holding a portion is provided, and an air injection port for injecting air toward the closed portion is provided in the concave portion.   The hollow part supply device according to claim 6, wherein a mass of the projection nut is set larger than a mass of the cover member.   The device for supplying a hollow part according to claim 6 or 7, wherein a target location to which the hollow part is supplied is a receiving hole provided in an electrode of an electric resistance welding machine.   The hollow part supply apparatus according to claim 8, wherein suction means for preventing the hollow part from dropping is provided on a part of the electrode.   The device for supplying a hollow part according to claim 8 or 9, wherein a top surface formed in the closing portion is in close contact with a conduction surface formed in a back portion of the receiving hole.   The apparatus for supplying a hollow part according to claim 8 or 9, wherein the step part formed on the outer peripheral part of the hollow part is in close contact with the conduction surface formed on the periphery of the opening part of the receiving hole.

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