KR100684470B1 - Spot welding equipment for nut - Google Patents

Abstract

A nut spot welding equipment which prevents safety accidents of workers, reduces the installation cost and reduces the working hour by moving an upper electrode and a lower electrode in a state that the nut is held by a nut holding part and spot welding the nut to the metal plate when spot welding a nut onto a through hole formed in a lower part of a metal plate as a base metal is provided. A nut spot welding equipment(1) comprises: a body(10) for supporting the spot welding equipment; a support(11) which has guide rails(12) longitudinally formed at both sides thereof, and on which an opening is formed; a transfer plate(13) transferred forward and backward on the guide rails by operation of the drive means; drive means(20) connected to the transfer plate to transfer the transfer plate forward and backward by receiving a control signal of the control means; a supporting frame(30) of which one side is integrally connected to the transfer plate, and of which the other side is connected to one side of the electrode operating means; electrode operating means(40) for supplying a power source to a nut held by the nut holding part to spot weld the nut onto a lower part of a metal plate that is a base metal; a nut holding part(50) which is connected to a fixed body by a bracket, and has a nut holding part electrode formed at an upper side thereof and a contact point formed at a lower side thereof; a base metal holding part which holds the metal plate as the base metal, and has a holding projection formed on an upper portion of the nut holding part correspondingly to a through hole formed on a lower portion of the metal plate to be welded; sensing means(70) for sensing injection of the metal plate into the base metal holding part or extraction of the metal plate from the base metal holding part; and control means(80) for controlling concerned means to spot weld the nut onto the welding portion on the lower part of the metal plate by operating the drive means and the electrode operating means.

Description

Spot welding equipment for nut {Spot welding equipment for nut}

1 is a perspective view of a spot welding apparatus for a nut applied to the present invention

Figure 2 is a side view showing the operating relationship of the spot welding apparatus for nuts applied to the present invention

Figure 3ab is a side view showing the operating state of the electrode operating means of the spot welding apparatus for nuts applied to the present invention

Figure 4 is an enlarged perspective view of the nut fixing part of the spot welding apparatus for nuts applied to the present invention

Figure 5 is a state of use of the spot welding apparatus for nuts applied to the present invention

* Description of Signs of Main Parts of Drawings *

1. Spot welding device 2. Base material

2a. Through-hole 3. nut

10. Main Unit 11. Base

11a. Opening 12. Guide rail

13. Transfer plate 20. Driving means

21. Drive cylinder 21a. road

22. Pneumatic means A 30. Support frame

40. Electrode operation means 41. Fixture

41a. Recess 41b. Guide ball

42. Tension spring 42a. Tension spring support

43. Guide rod 44. Electrode operation means

45. Pneumatic means B 46. Connecting rod

47. Upper electrode 48. Lower electrode

49. Lower electrode support 50. Nut fixing part

51. Bracket 51a. Fixture

52. Fixing protrusion 53. Nut fixing electrode

54. Contact point 60. Base material fixing part

70. Detection means 80. Control means

The present invention relates to a spot welding device for a nut, and more particularly, in a work site for spot welding a nut and a part of a part to a base metal plate, when spot welding a nut to a lower portion of the base metal plate, The present invention relates to a spot welding device for a nut configured to minimize spot defects by allowing an upper electrode and a lower electrode to move to a spot welding while the nut is fixed thereto.

In general, in order to join the metal and the metal, the welding is used to remove the interfering substances present in the joining portions of two or more base metals, and the welding used in the welding includes arc welding, gas welding, There are electron beam welding, laser beam welding and electric resistance welding. In particular, in order to join a plurality of steel sheets such as a vehicle body, welding is performed using spot welding, which is the electric resistance welding method, to efficiently weld a plurality of steel sheets. Make sure to bond firmly.

The spot welding is invented because the electrical resistance of the contact surface is large when the plate to be bonded is sandwiched between two electrodes, and the contact resistance is large, and the resistance of the contact surface is soon extinguished. Therefore, the resistance of the base material itself is increased so that the temperature is further increased. The two metal plates are joined together, and copper alloys including steel, light alloys, pure copper for copper alloys, and Cr, Ti, Ni, etc. are used for copper welding. Spot welding is used for various metals such as low carbon steel, high carbon steel, low alloy steel, aluminum and aluminum alloy, stainless steel, tin plate, etc. Compared to the case of tightening, the rivet hole does not need to be drilled and the work is simple, and the head of the rivet appears on the surface. I do not support a situation which is mostly commonly used when a cabinet, box, office or car body joints.

Due to the rapid development of the automobile industry, automobile parts and body assembly are mainly supplied by suppliers, and the companies supplying the vehicle body use a spot welding machine to join the two metal plates, which are the base metals. The spot welder is equipped with a tip, which is an electrode for localized energization and pressurization, on both sides of the overlapping base metal plate, and melting of the base material occurs at the tip of the tip using high heat generated by the high current and the pressing force generated at the tip. Allow two metal plates to be joined together.

Since the metal plate for automobile body manufactured using the spot welder as described above is thin, it is difficult to form a screw part separately, so that it is usually used by welding a nut or the like. In the related art, a material supply to a welding part is manually supplied to a welding part by an operator. However, this is not only cumbersome and inconvenient to supply the nut to the welding part, but also lowers the productivity. In recent years, the base metal plate is placed on the welding part of the spot welder using a robot, and the nut is supplied to the welding part by using an automatic feeding device. It is common practice to use spot welding automatically.

When spot welding nuts are welded to a metal plate for automobile body by using the spot welder, the parts to which the nut of the metal plate for the body is welded are usually located at one side such as the upper side or the outer side, and the size of the base metal plate is large. Since the weight is heavy, it is difficult to work by the worker's hand, so that the nut can be welded to the base metal plate by using a robot. When the nut is welded to the base metal plate on the opposite side, that is, the lower side or the inner side, In the state in which the worker inverts the metal plate, which is the base metal, the nut is fixed on the nut to be welded by joining the upper and lower tips.

In the case where the nut is to be welded to the lower side of the base metal plate as described above, in order to weld the nut on the upper side of the base metal plate or a spot is welded to a certain part, in order to weld the nut to the lower side separately The work must be done by the worker's manual work. In this case, the metal plate, which is the base metal, is heavy and heavy, which lowers the work efficiency and exposes the worker to safety accidents.

Also, for the sake of safety, the nut can be welded by using a robot with a large and heavy base material, but if the number of nuts in the site to be welded is small, the installation cost of the robot is excessively expended. It takes a lot of work time, the productivity is lowered, there is a problem that becomes a cost increase factor.

The present invention has been made in order to improve the above-mentioned conventional problems, when spot welding the nut on the through-hole formed on the lower side of the base metal plate, the nut is moved to the spot electrode by moving the upper electrode and the lower electrode in the state fixed to the nut fixing portion By making this can be done, it is intended to prevent safety accidents due to the manual operation of the operator, to reduce the installation cost, and to prevent the increase in product cost due to the saving of working time.

In the spot welding apparatus for nuts in order to achieve the above object,

A main body supporting the spot welding device in a stable horizontal state on the floor of the workplace; A pedestal configured to be spaced apart to form a lower space above the main body, the guide rails being formed on both sides in a longitudinal direction, and an opening formed; A conveying plate which is conveyed forward and backward on the guide rail, one side of the supporting frame is integrally formed on the upper side, and is connected to the driving means on the lower side and is conveyed forward and backward by the operation of the driving means; Drive means connected to the transfer plate to receive a control signal from a control means to transfer the transfer plate forward and backward; It consists of a 'b' shape and one side is integrally connected with the transfer plate, the other side is the support frame connected to one side of the electrode operation means; When air of constant pressure is supplied by the pneumatic means, the power is supplied to the nut fixed to the nut fixing part by the lowering of the upper electrode and the synergism of the lower electrode by driving the electrode operating cylinder, thereby spotting the lower side of the base metal plate. Electrode operation means for welding; It is coupled by a fixture and a bracket so that it can be fixed during spot welding, the nut is inserted into the upper side to form a fixing projection electrode connected to the fixing protrusion and the lower contact, the lower electrode of the electrode operating means in contact A nut fixing portion to form a contact receiving power; A base plate fixing part formed by inserting and fixing a metal plate as a base material, the fixing protrusions formed at an upper side of the through hole formed in the portion to be welded below the metal plate and the nut fixing part correspond to each other; Sensing means for detecting that the metal plate is put or taken out of the base material fixed portion to transmit a signal to the control means; After the nut is supplied to the nut fixing part through the nut supply means, the sensing means detects that the metal plate is inserted into the base material fixing part and operates the driving means and the electrode operation means to weld the spot to the portion to be welded under the metal plate. It is intended to implement a spot welding device for a nut consisting of; a control means for controlling the corresponding configuration means to be made.

Hereinafter, with reference to the drawings will be described in detail a spot welding apparatus 1 for a nut applied to the present invention.

Figure 1 is a perspective view of a spot welding apparatus 1 for nuts applied to the present invention, Figure 2 is a side view showing the operating relationship of the spot welding apparatus 1 for nuts applied to the present invention, Figure 3ab Figure 4 is a side view showing the operating state of the electrode operating means 40 of the spot welding apparatus 1 for nuts applied to the nut, Figure 4 is a nut fixing part 50 of the spot welding apparatus 1 for nuts applied to the present invention 5 is an enlarged perspective view, and FIG. 5 is a state diagram of use of the spot welding apparatus 1 for a nut applied to the present invention.

As shown in the drawing, the supporting part 11 having the guide rail 12 formed on the upper side of the main body 10 is formed, and the transfer plate 13 is driven forward and backward on the guide rail 12 by the driving means 20. When the detecting means 70 detects that the nut 3 is supplied on the nut fixing part 50 and the metal plate 2, which is the base material, is injected into the base material fixing part 60, the control means 80. ) Advances the transfer plate 13 on which the support frame 30 is formed so that the upper electrode 47 is lowered through the electrode operating means 40 formed on one side of the support frame 30 so that the upper side of the base metal plate 2 is formed. And the lower electrode 48 is raised to be brought into contact with the contact 53 formed under the nut fixing part 50 to supply power, so that the nut 3 supplied to the nut fixing part 50 is welded. It is comprised so that it may be joined to the metal plate 2 which is a base material by heat.

The main body 10 is installed on the bottom surface of the workplace stably and horizontally to support the spot welder 1 as a whole, but the base 11 having the guide rail 12 formed thereon has a predetermined interval. It is formed in a spaced apart state, and the opening (11a) is formed in the pedestal 11 to drive the drive means 20 formed in the lower space and the transfer plate 13 is configured to enable forward and backward transfer.

The guide rail 12 is installed on the upper side of the pedestal 11 so that the transfer plate 13 is easily moved forward and backward, but the transfer plate 13 is smooth without being separated from the guide rail 12 It is made of a structure to be transported.

The transfer plate 13 is configured such that one side of the support frame 30 having a '-' shape is integrally formed at an upper side thereof, and is connected to the driving means 20 through the opening 11a of the pedestal 11 at the lower side thereof. By the operation of the drive means 20 to be transported forward and backward.

The driving means 20 is a means for transferring the transport plate 13 connected by the electrode operation means 40 and the support frame 30 forward and backward on the guide rail 12, the pedestal 11 The driving cylinder 21 is installed in the longitudinal direction of the guide rail 12 in the lower space of the side, and one side of the rod 21a operated by the driving cylinder 21 is a predetermined portion of the lower side of the transfer plate 13. It is integrally connected to the transfer plate 13 so that the transfer plate 13 by the forward and backward transfer of the rod 21a, the pneumatic means A (22) is formed in the supply pipe of the drive cylinder 21 to control means ( The control signal of 80 is applied to control the operating pressure of the driving cylinder 21.

The support frame 30 is made of a 'b' shape is integrally connected to one side of the upper side of the transfer plate 13, the other side is integrally connected to one side of the electrode operation means 40 and the transfer plate 13 The electrode operation means 40 is configured to be connected to each other.

When the electrode operating means 40 is supplied with air of a predetermined pressure by the pneumatic means B (45), the upper electrode 47 and the lower electrode 48 is operated by the electrode operating cylinder 44 to the base metal plate ( Means for allowing the nut (3) to be spot welding on the lower side of the 2), the electrode operation means 40 is formed on the upper one side to form a fixed support 41 fixed to the support frame 30, the fixed 41 forms a recessed portion 41a of a predetermined depth through which the tension spring 42 is recessed, forms a guide hole 41b through which the guide rod 43 penetrates, and is moved up and down by the electrode operation cylinder 44. To be operatively formed.

The tension spring 42 recessed in the recess 41a of the holder 41 is configured to be supported by the tension spring support 42a, but the tension spring 42 has a constant tension while the electrode actuating means 40 While being compressed by the weight of), when a constant operating pressure is provided to the electrode operating cylinder 44 by the pneumatic means B 45, the electrode operating means 40 is raised by the restoring force of the tension spring 42. The electrode actuating cylinder 44 is formed on the front of the holder 41, and the tension spring support 42a, the guide rod 43, and the electrode actuating cylinder 44 are formed by the connecting rod 46. It is fixed to each upper side of the upper and lower operation in a state connected to each other, and the lower side of the lower electrode support 49 of the '' 'shape on each lower side of the electrode operation cylinder 44 and the guide rod 43. It is configured to be integrally formed so that it is the same as that of the electrode operation cylinder 44. The upper electrode 47 is integrally formed on the rod of the electrode operation cylinder 44 so that a constant operating pressure is provided by the pneumatic means B 45 so as to lower the upper electrode 47. .

The nut fixing part 50 is to be fixed by the bracket 51 at a position corresponding to the portion to be welded to the nut 3 of the base metal plate 2, the bracket 51 is the base material fixing part 60 ) Or other fixing body 51a so that the nut fixing part 50 can always be fixed at a certain position without flowing during spot welding, and the nut 3 can be inserted and fixed at the upper side. The protrusion 52 protrudes, and a nut fixing electrode 53 is formed to be connected to a contact formed on the lower side to supply power, and the fixing protrusion 52 and the nut fixing electrode 53 are consumable parts. It is made of an easily replaceable structure, the lower electrode 48 of the electrode operating means 40 is in contact with the contact 53 to provide power.

The base material fixing part 60 is a means for inserting and fixing a metal plate 2 as a base material, and a through hole 2a formed at a portion to be welded below the metal plate 2 is formed above the nut fixing part 50. It is configured to correspond to the fixing projection (52).

The sensing means 70 detects that the base metal plate 2 is inserted into or withdrawn from the base material fixing part 60 and transmits a signal to the control means 80 to smoothly nut the lower portion of the base metal plate 2. Allow (3) to be spot welded.

The control means 80 supplies the nut 3 to the nut fixing part 50 through a nut supply means (not shown), and then a metal plate as a base material to the base material fixing part 60 through the sensing means 70. When it is detected that the (2) is input, the drive means 20 is operated so that the electrode operation means 40 is moved forward to be located at the site to be welded to the base metal plate 2, the electrode operation means 40 The upper electrode 47 is lowered to contact the upper side of the portion to be welded to the base metal plate 2, and the lower electrode 48 is raised to supply power to the nut fixing part 50. When the nut 3 fixed to the nut fixing part 50 is to be spot welded to a portion to be welded to the lower side of the base metal plate 2, and the base metal plate 2 is taken out, the driving means 20 ) To control the corresponding construction means so that the electrode operation means 40 moves backward.

The pneumatic means AB (22, 45) consists of a solenoid valve for controlling the operating pressure of each cylinder by receiving a control signal from the control means 80, connected to the supply pipe of each cylinder to control the cylinder by the operating pressure To be activated by a control signal according to (80).

The operation of the spot welding apparatus 1 for nuts constructed by one embodiment of the present invention as described above will be described in detail.

The main body 10 is installed on the floor of the work station while being horizontally formed, and the pedestal 11 having the opening 11a formed on the main body 10 is formed to be spaced a predetermined distance apart from the bottom of the pedestal 11. The drive means 20 is formed to form a drive cylinder 21 and the transfer plate 13 to be connected, and the transfer plate 13 is coupled to the guide rail 12 formed above the pedestal 11 to drive the drive means ( Install in such a way that forward and backward transfer is possible by 20).

One side of the support frame 30 having a '-' shape is integrally formed on the upper side of the transfer plate 13, and the other side of the support frame 30 is integrally connected to one side of the electrode operation means 40. 13 and the electrode operating means 40 is configured to be connected to each other.

The nut fixing part 50 is installed at a predetermined portion in front of the electrode operating means 40, but the nut fixing part 50 is formed by using a bracket 51 so as not to flow during spot welding of the nut 3. It is installed so as to be connected to the fixing part 60 or other fixing body 51a, and the base material fixing part 60 is formed in a shape that can be fixed by the input metal plate (2) of the base material is the base metal plate (2) The through hole 2a formed in the portion where the lower nut 3 is to be welded is correctly installed so as to correspond to the fixing protrusion 52 formed above the nut fixing part 50.

The supply pipe of each cylinder is provided with a solenoid valve which is a pneumatic means 22 and 45 to adjust the operating pressure so that the cylinder can be operated by pneumatic pressure, the control signal of the control means 80 is applied to control accordingly In the base material fixing part 60, a sensing means 70 is formed so as to transmit whether the metal plate 2, which is the base material, is input to the control means 80.

The operating relationship will be described with the focus on the case where the nut 3 is welded to the lower side of the base metal plate 2 by using the spot welding apparatus 1 for nuts according to the present invention having the above configuration.

Before the metal plate 2, which is the base metal, is inserted into the base material fixing part 60, the control means 80 applies a control signal to the nut supplying device so that the nut is formed on the fixing protrusion 52 formed on the upper side of the nut fixing part 50. 3) to be supplied, and when the metal plate 2 of the base material is inserted into the base material fixing part 60, the sensing means 70 detects and transmits a signal to the control means 80, wherein the base material is The metal plate 2 is brought into contact with the through hole 2a of the portion to be welded by the base material fixing part 60 to correspond to the center of the nut 3.

The control means 80 applies a control signal to the drive means 20 to control the drive cylinder 21 to be moved forward by the pneumatic means A (22), so that the drive cylinder 21 to move forward When the transfer plate 13 connected to one side of the rod 21a of the driving cylinder 21 is moved forward, the electrode operation means 40 connected to the transfer plate 13 and the support frame 30 is moved forward. The upper electrode 47 and the lower electrode 48 are positioned above and below the nut fixing part.

When the electrode operating means 40 is located on the nut fixing part 50, the control means 80 applies a control signal to the electrode operating means 40, the pneumatic means B (45) by the electrode operating cylinder ( 44 is operated so that, when air of a constant pressure is supplied to the electrode operation cylinder 44 by the pneumatic means B 45, the electrode operation means (in the recess 41a of the holder 41) The tension spring 42, which is in the compressed state by the weight of 40, is tensioned by the restoring force, thereby raising the electrode operating cylinder 44.

The lower electrode support 49 connected to the electrode operation cylinder 44 is raised to turn on the nut fixing part electrode 53 while the lower electrode 48 contacts the contact 53 formed under the nut fixing part 50. At this time, the rod in the electrode operation cylinder 44 lowers the upper electrode 48 by a constant pressure supplied by the supply means B 45 to abut against the portion to be welded to the base metal plate 2. At the same time, the power is supplied so that the spot welding can be made on the nut 3 located at the portion to be welded below the base metal plate 2.

When the spot welding of the nut 3 is completed at the portion to be welded to the lower portion of the base metal plate 2 as described above, the control means 80 applies a control signal to the electrode operation means 40 to supply the pneumatic means B 45. By removing the air of a constant pressure through, the tension spring 42 tensioned in the recess 41a of the holder 41 by its own weight of the electrode operating means 40 is maintained in a compressed state while the lower electrode support ( The lower electrode 48 formed on the 49 is lowered, and the rod of the electrode operating cylinder 44 is raised while raising the upper electrode 47.

The control means 80 applies a control signal to the drive means 20 to control the drive cylinder 21 to be transferred backward by the pneumatic means A (22), thereby connecting the transfer plate ( 13 is moved backward, the transfer plate 13 is to return the electrode operating means 40 connected to the support frame 30, the metal plate 2, which is the base material located on the base material fixing part 60 is a manual or robot After being taken out by the control means, the control means 80 supplies a nut 3 to the nut fixing part 50 by applying a control signal to the nut supply device, thereby controlling the above process to be repeated. .

As described above, in the present invention, when spot welding the nut 3 to the base metal plate 2, the nut 3 is fixed on the nut fixing part 50 when the part to be welded is located below, and the base material fixing part By the electrode 60, the electrode operating means 40 is transported in a state where the through hole 2a of the portion to be welded below the base metal plate 2 is configured to correspond to each other, whereby spot welding is performed, thereby reducing the defective rate for nut welding. As described above, the present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention by those skilled in the art to which the present invention pertains. It is not limited to the embodiment and the accompanying drawings.

The present invention is in the field of spot welding the nut and various types of parts to the base metal plate, especially when the direction of spot welding of the nut is located on the base metal lower side of the base metal plate in the upper and the state in which the nut is fixed By spot welding can be made by moving the lower electrode, there is an effect of reducing the risk of safety accidents due to the manual operation of the operator, work efficiency is improved, and minimizes the defective rate of the product.

Claims (3)

In spot welding apparatus for nuts, A main body supporting the spot welding device in a stable horizontal state on the floor of the workplace; A pedestal configured to be spaced apart to form a lower space above the main body, the guide rails being formed on both sides in a longitudinal direction, and an opening formed; A conveying plate which is conveyed forward and backward on the guide rail, one side of the supporting frame is integrally formed on the upper side, and is connected to the driving means on the lower side and is conveyed forward and backward by the operation of the driving means; Drive means connected to the transfer plate to receive a control signal from a control means to transfer the transfer plate forward and backward; It consists of a 'b' shape and one side is integrally connected with the transfer plate, the other side is the support frame connected to one side of the electrode operation means; When air of constant pressure is supplied by the pneumatic means, the power is supplied to the nut fixed to the nut fixing part by the lowering of the upper electrode and the synergism of the lower electrode by driving the electrode operating cylinder, thereby spotting the lower side of the base metal plate. Electrode operation means for welding; It is coupled by a fixture and a bracket so that it can be fixed during spot welding, the nut is inserted into the upper side to form a fixing projection electrode connected to the fixing protrusion and the lower contact, the lower electrode of the electrode operating means in contact A nut fixing portion to form a contact receiving power; A base plate fixing part formed by inserting and fixing a metal plate as a base material, the fixing protrusions formed at an upper side of the through hole formed in the portion to be welded below the metal plate and the nut fixing part correspond to each other; Sensing means for detecting the input or withdrawal of the metal plate to the base material fixed portion to transmit a signal to the control means; After the nut is supplied to the nut fixing part through the nut supply means, the sensing means detects that the metal plate is inserted into the base material fixing part and operates the driving means and the electrode operation means to weld the spot to the portion to be welded under the metal plate. Spot welding apparatus for a nut, characterized in that consisting of; control means for controlling the configuration means to be made. The method of claim 1, The drive means is installed in the longitudinal direction of the guide rail in the lower space of the pedestal drive cylinder connected to one side of the transfer plate on one side of the rod; Spot welding device for a nut, characterized in that formed in the supply pipe of the drive cylinder is supplied with a control signal of the control means to provide a predetermined operating pressure to the drive cylinder; The method of claim 1, The electrode operation means is formed on the upper side is fixed to the support frame fixed to the support frame, the support is configured to form a concave indentation to the tension spring is inserted, the guide rod is penetrated, the tension spring is a tension spring It is configured to be supported by the support, but is in a compressed state by the weight of the electrode operation means having a constant tension, and when driving the electrode operation cylinder, to raise the electrode operation means by a restoring force, the front of the fixture The electrode operation cylinder is formed on the tension spring support, the guide rod, and the upper side of the electrode operation cylinder are fixedly coupled by the connecting rod, and the lower electrode support having a '-' shape is formed under the electrode operation cylinder. And a lower electrode formed at an end of the lower electrode support, and an upper portion of the rod of the electrode working cylinder. Nut spot welding apparatus, characterized in that the electrode is configured to be formed.

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