JP2007167921A - Capacitor discharge type stud welding gun, portable capacitor discharge type stud welding machine with the same, and method of welding stud or the like by using the capacitor discharge type stud welding gun - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain a high-strength stud welding which gives a sufficient pressure to a part to be welded during the discharge on the surface of a non-flat sheet metal. <P>SOLUTION: The capacity discharge type stud welding gun is provided with: an electrode slide rod and a spring for urging the rod forward in a welding gun body; a chuck part for chucking a member to be welded and an electrode slide rod guide on a fore-end of the electrode slide rod. The spring includes: a front spring arranged in front of the electrode slide rod guide; and a rear spring arranged via a rear spring stopper with a space backwardly from a rear end of the electrode slide rod. A switch depressing unit to turn on a welding switch by the backward movement of the electrode slide rod is provided, the front springs depresses the electrode slide rod forwards, then the electrode slide rod colliides against a rear stopper in an accelerated manner to turn on the welding switch, then the discharge current is outputted. A part of the electrode slide rod collides against an abutting part of the welding gun body in an accelerated manner at the timing before a molten pool is solidified. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention particularly relates to a welding gun for performing capacitor discharge type stud welding (hereinafter referred to as a capacitor discharge type stud welding gun) among portable welding guns for manually welding vehicle parts and the like, and the capacitor discharge type. The present invention relates to a portable capacitor discharge type stud welding machine equipped with a welding gun, and further to a welding method for a base material of a stud or other metal to-be-planted member (for example, corrugated wire, washer, etc.) using these.

  In work such as sheet metal repair of automobiles, it is often performed to implant a to-be-fused member such as a stud bolt, a corrugated wire, or a washer on a base material. In such operations, a portable welding machine equipped with a stud welding gun can be used. The stud welding gun in the portable welding machine incorporates a spring in its main body, holds the above-mentioned stud bolt or other to-be-planted member on the tip chuck of the stud welding gun, and attaches it to the base material (for example, a metal plate). On the other hand, an instantaneous discharge is performed for welding.

  As such a capacitor discharge type welding gun, there are generally a contact method and a gap method (lift-up method). In the contact method, a stud bolt or the like attached to the chuck portion at the tip of the welding gun is previously contacted (contacted) with a predetermined spring pressure on the surface of the welding member. Then, the output switch is turned on, a discharge current is passed from the capacitor, and welding is performed. The contact method has a drawback that the welding force with respect to the base material such as the stud bolt tends to become unstable because the force with which the user presses the welding gun against the base material is not constant. In order to avoid this, as a means for separating the base material and the slide rod at regular intervals, about three bars may be attached to the portable capacitor discharge type stud welding gun.

  In addition, as the capacitor discharge type stud welding gun showing the contact method, for example, a welding machine body including a large capacity capacitor and a charging circuit for the capacitor, and a charging circuit in the welding machine body are electrically connected. In the capacitor arc type stud welding machine, the stud welding gun is a combination of a stud welding gun that supports the chucking of the stud member and can perform a welding operation at a position away from the welding machine main body. A gun body portion provided with a stud member chucking means, and a gun grip hand portion integrally combined with the gun body portion, and the gun grip hand portion in the stud welding gun includes When the gun grip is gripped, the electrical contacts are closed and the welding machine is welded. A welding voltage selection operation switch that outputs a selection signal, and a welding that is provided in the vicinity of the welding voltage selection operation switch, closes an electrical contact by pushing operation, and outputs a welding start signal to the welding machine body A capacitor discharge type stud welding gun (see, for example, Patent Document 1) characterized in that a start operation switch is provided is known.

On the other hand, the gap type capacitor discharge type stud welding gun does not make the stud bolt attached to the chuck part at the tip of the welding gun contact the surface of the base material, and uses a means such as a solenoid coil to connect the base material and the stud bolt. And the like are lifted so that the distance from the head is constant. Then, the stud bolts that are lifted up are struck against the surface of the base material while accelerating together with the electrode rod when the output switch of the welding gun is turned on. Bolts and the base material are welded.
Japanese Patent Laid-Open No. 5-154660

  However, among the above, the bar in the capacitor discharge type stud welding gun according to Patent Document 1 can be used effectively as long as it is welded to a flat base material without undulations. Not only does it not function effectively on the surface, it has the drawback of interfering with work. For this reason, the said bar material is removed and used, and the fault which the welding force with respect to base materials, such as a stud bolt, becomes unstable easily cannot be eliminated.

  On the other hand, the gap type capacitor discharge type stud welding gun does not make the stud bolt attached to the chuck part at the tip of the welding gun contact the surface of the base material, and uses a means such as a solenoid coil to connect the base material and the stud bolt. And the like are lifted so as to keep the distance to be constant. In the gap method, the lifted stud bolt, etc. is struck against the surface of the base metal while accelerating with the electrode rod when the welding gun output switch is turned on, and at this time, a large current is discharged from the capacitor. Thus, the stud bolt and the base material are welded. For this reason, in order to accelerate the stud bolt and the like together with the electrode rod, it is necessary to maintain a certain distance from the base material to the stud bolt and the like. For this purpose, it is necessary to provide a plurality of rods on the portable capacitor discharge type stud welding gun. is there. Therefore, like the contact method in which the base material and the slide rod are spaced apart from each other at a constant interval, the non-flat sheet metal surface does not function effectively, and there is a drawback that obstructs the work.

  Further, in the gap method, the use of a solenoid coil or the like complicates the configuration, tends to increase the weight and increase the size, and has a drawback that the ease of handling as a portable capacitor discharge type stud welding gun is impaired.

  By the way, the capacitor discharge type stud welding machine has poor contact if there is a paint film, oil film, etc. on the surface of the metal plate that is the base material. If the discharge current is output as it is, spatter (spark) from the welded part of the base material And the base metal surface is significantly damaged. For this reason, if breakage due to such poor contact can be prevented in advance, the ease of handling and the stability of the quality of welding are further improved, which is very convenient.

  The present invention has been made in view of the above circumstances, and even on a non-flat sheet metal surface or the like without using a plurality of bar members, a sufficient pressing force is applied to a welding portion at the time of discharge, and high strength stud welding is performed. Furthermore, it is an object of the present invention to provide an excellent capacitor discharge type stud welding gun that prevents damage to the surface of the base material due to poor contact during welding and improves ease of handling and welding quality stability. Is a problem to be solved.

  The present invention includes an electrode slide rod that is slidable in the front-rear direction and a spring that biases the electrode slide rod forward in a welding gun body, and a chuck portion that holds a to-be-fused member at the tip of the slide rod. The capacitor discharge type stud welding gun includes an electrode slide rod guide for guiding the electrode slide rod, and the spring is spaced apart from a front spring disposed in front of the slide rod guide and a rear end of the electrode slide rod. A rear spring disposed via a rear spring stopper, and a structure including a switch pressing portion that turns on the welding switch by following the electrode slide rod as the electrode slide rod moves rearward. With the spring pressing the electrode slide rod forward by the spring elastic force, the electrode slide rod is spring elastic of the rear spring. Against the rear spring stopper, the switch pressing part that follows the electrode slide rod turns on the welding switch and outputs a discharge current. The capacitor discharge type stud welding gun is characterized in that the part or the part that follows this part collides with the contact part of the welding gun main body at an accelerated speed.

  According to the present invention, the spring is a front spring disposed in front of the slide rod guide, and a rear spring disposed via a rear spring stopper with a space behind the rear end of the electrode slide rod and welded. Immediately before the switch is turned on, that is, immediately before the discharge, the front spring presses the material to be welded against the base material, and the electrode slide rod accelerates and collides with the rear spring stopper against the spring elasticity of the rear spring. Acts on the to-be-fused member, so that the tip of the to-be-fused member is not easily deformed. For this reason, it is possible to perform efficient welding without reducing the current density per unit area during discharge.

  The electrode slide rod includes a switch pressing portion that turns on the welding switch by contact. When the switch pressing portion of the electrode slide rod turns on the welding switch, a discharge current is output and the molten pool is solidified at a timing. As a part of the electrode slide rod collides with the abutting part of the welding gun body, the pressure of the front spring, the impact load of the rear spring, and the impact load of a part of the slide rod are applied to the welded part. The to-be-fused member can be fixed to the base material.

  Furthermore, with the same configuration, a stud bolt, an iron washer bit, a corrugated wire bit, or the like is held at the tip of the slide rod, and the front spring presses the to-be-fused member against the base material. The electrode rod accelerates and collides with the rear spring stopper due to elasticity, and the switch pressing part of the electrode slide rod turns on the welding switch to output a discharge current, and at the timing until the molten pool solidifies, a part of the electrode slide rod is The object to be accelerated is collided with the contact portion of the welding gun main body, and the to-be-fused member is welded to the base material. In other words, the output switch is turned on as in the normal gap type welding gun, while the welding target member is pressed against the base material and welded only once, as in the normal contact type welding gun. Thus, it is struck against the surface of the base material while accelerating together with the electrode rod, and at this time, a large current is discharged from the capacitor, so that the to-be-planted member and the base material are welded. For this reason, it is suitable for welding aluminum stud bolts, etc., which are soft materials such as gap type capacitor discharge type welding guns, while the front spring is arranged on the same axis as the electrode slide rod. However, with the configuration in which the electrode slide rod is always pushed forward, there is no need to provide a plurality of rods at the tip of the welding gun for maintaining a certain distance from the base material required for the gap method to the to-be-fused member.

  According to the invention of claim 2, the contact portion of the welding gun body is an electrode slide rod guide, so that it has both a guide function and a function as a contact portion, and has a simplified configuration. Therefore, it is possible to provide a capacitor discharge type stud welding gun having higher operational stability, easy handling, and low manufacturing cost.

  According to the invention of claim 3, the welding gun main body is provided with spring pressure switching means, and the spring pressure switching means includes a rotating plate and a block disposed on the rear surface of the rotating plate, and the rotating plate Since the rear surface of the block or the rotation plate is selectively functioned as a switch pressing portion by rotating around the center axis of the slide rod, the relative position is selected when the front end of the front spring is in contact with the block. The spring is compressed and strengthened, and if the state where the front end of the front spring is in contact with the rear surface of the rotating plate is selected, the spring is relatively stretched and weakened, and is held by the tip of the electrode slide rod. A pressing force to the base material according to the material of the fused member can be ensured.

  According to the invention according to claim 4, in addition to realizing efficient and strong stud welding by the configuration of the invention according to the above-mentioned claim, the welding gun main body is a spring for adjusting the repulsive elastic force of the rear spring. Since the pressure adjusting screw is provided as a multi-threaded screw, when adjusting the spring pressing force by rotating the spring pressure adjusting screw, the spring pressing force can be greatly changed with a small number of rotations. The trouble of adjusting can be greatly reduced.

  According to the invention according to claim 5, in addition to the configuration of the invention according to the above-mentioned claim, by providing the front spring pressure switching lever for stepwise switching the spring elastic force of the front spring, the to-be-fused member is relatively If the material is flexible, the spring elastic force can be set low, and if the material to be fused is robust, the spring elastic force can be set high, so optimum stud welding according to the material of the material to be fused is used. Can be easily performed.

  Since the present invention described above exhibits the light weight and excellent operability of the stud welding gun, as shown in the invention according to claim 6, the portable capacitor discharge type stud welding machine can be used to It can contribute to portability and convenience required for the capacitor discharge type stud welding machine, and can greatly improve the convenience of welding work.

  According to the invention of claim 7, the portable capacitor discharge type stud welding machine includes a discharge circuit and a charge circuit, and the discharge circuit does not require manual operation of a welding switch as a discharge requirement, and is an electrode. By providing a circuit that requires the pushing operation of the slide rod as a discharge requirement (that is, an automatic circuit), it is possible to perform stud welding simply by pressing the object to be welded attached to the tip of the stud welding gun against the base material. Can be greatly improved.

  As a specific means for exerting the function and effect, as shown in the invention according to claim 8, the discharge circuit has a discharge control device and a conductivity detection device, and the conductivity detection device sends a conduction detection signal to the discharge control device. The discharge control device may be configured to include the conductivity detection signal in a discharge condition.

  According to the invention of claim 9, the electrode slide rod is pushed forward by pushing the electrode slide rod from the front against which the front spring resists the spring elastic force, and the electrode slide rod is spring elastic force of the rear spring. Against the rear spring stopper, the switch pressing part that follows the electrode slide rod turns on the welding switch and outputs a discharge current. A very strong welding can be performed by a unique method in which a part or a part driven by the part collides with a contact part of the welding gun main body at an accelerated speed.

  Capacitor discharge having an electrode slide rod slidable in the front-rear direction and a spring for biasing the electrode slide rod forward in the welding gun body, and a chuck portion for holding a to-be-fused member at the tip of the electrode slide rod In the type stud welding gun, an electrode slide rod guide for guiding the electrode slide rod is provided, and the spring is disposed in front of the electrode slide rod guide, and a front spring for biasing the electrode slide rod forward, and an electrode slide rod A switch pressing part that is spaced from the rear end of the rear end and is a rear spring that is arranged via a rear spring stopper, and that is driven by the electrode slide rod to turn on the welding switch as the electrode slide rod moves rearward. By pushing the electrode slide rod from the front where the front spring resists the spring elastic force The electrode slide rod is pressed forward, the electrode slide rod collides with the rear spring stopper against the spring elastic force of the rear spring, and the switch pressing part driven by the electrode slide rod turns on the welding switch to discharge. A part of the electrode slide rod or a part driven by it is accelerated and collides with the contact part of the welding gun body at the timing until the current is solidified and the molten pool is solidified. A spring pressure adjusting screw for adjusting the resilience elastic force is provided, and the spring pressure adjusting screw is a multi-threaded capacitor discharge type stud welding gun, and a contact type pressing by a front spring and a gap type pressing by a rear spring. The front spring urges the electrode slide rod forward, and the electrode slide rod and the rear spring stopper are spaced from each other. , Stud welding on the undulated and distorted surface with stable welding force, assuming that there is no need for the bar material at the tip required for the gap method, keeping a certain distance from the tip of the electrode slide rod to the rear spring stopper Realized. In addition, with the same configuration, a stronger welding was realized by applying an impact force to the weld before and after one discharge.

1 is a front view showing a capacitor discharge stud welding gun according to an embodiment of the present invention, FIG. 2 is a right side view showing a capacitor discharge stud welding gun according to the embodiment, and FIG. 3 is a capacitor according to the embodiment. FIG. 4 is an explanatory view showing a first stage of a welding process using the stud welding gun according to the embodiment, and FIG. 5 is a drawing showing the discharge type stud welding gun. FIG. 6 is an explanatory view showing a third stage of the welding process using the capacitor discharge type stud welding gun according to the embodiment, and FIG. 7 is an explanatory view showing the second stage of the welding process using the stud welding gun. FIG. 8 is an explanatory view showing a fourth stage of the welding process using the stud welding gun according to the embodiment, and FIG. 8 is an electrode slide rod and an electrode slide rod in the first stage during the aluminum material welding process of the stud welding gun according to the embodiment. guide FIG. 9 is a perspective explanatory view showing the relationship between the electrode slide rod and the electrode slide rod guide in the fourth stage during the aluminum welding process of the stud welding gun according to the embodiment, and FIG. FIG. 11 is a perspective explanatory view showing the relationship between the electrode slide rod and the electrode slide guide in the first stage during the iron welding process of the stud welding gun according to the embodiment. FIG. 11 is during the iron welding process of the stud welding gun according to the embodiment. FIG. 12 is a perspective explanatory view showing the relationship between the electrode slide rod and the electrode slide rod guide in the fourth stage, FIG. 12 is a circuit diagram of the capacitor discharge type stud welding gun according to the embodiment, and FIG. 13 is the capacitor discharge according to the embodiment. FIG. 14 is an explanatory view showing a capacitor discharge type stud welding machine equipped with a type stud welding gun, and FIG. 14 shows a capacitor discharge type stud welding machine according to the same embodiment. It is a plan view of the distal portion of the gun.

  As shown in FIGS. 1 to 3, a capacitor discharge stud welding gun 1 according to an embodiment of the present invention has a basic structure composed of a cylinder 10 and a grip portion 11 integrally formed on the lower surface of the cylinder 10. A resin welding gun body 1a, an electrode slide rod 100 provided in the cylinder 10 of the welding gun body 1a, an electrode slide rod guide 102 for guiding the electrode slide rod 100, and the electrode slide rod 100 are always attached forward. The front spring 18 that is biased, the front spring pressure switching lever 14 that rotates within a certain range with respect to the central axis of the electrode slide rod 100, and the electrode slide rod 100 that is arranged on the rear coaxial axis and accelerates the electrode slide rod 100. A rear spring 19 and a rear spring stopper 124 for adjusting the elastic force of the rear spring 19 A pressure adjusting knob 12. Below, the detail of a structure of the capacitor discharge type stud welding gun 1 which concerns on a present Example is demonstrated.

  The welding gun body 1a of the capacitor discharge type stud welding gun 1 according to the present embodiment is formed by abutting a right member and a welding gun body left member made of synthetic resin. The welding gun main body right member and the welding gun main body left member are substantially symmetrical in shape, and form a storage space for storing the electrode slide rod 100, the electrode slide rod guide 102, and the like by abutting each other.

  As shown in FIG. 3, an electrode slide rod 100 is disposed in the storage space in the cylinder 10 in the longitudinal direction of the center of the shaft. The electrode slide rod 100 is slidable in the front-rear direction and is guided by the electrode slide rod guide 102 serving as a holding means for the electrode slide rod 100. The tip of the electrode slide rod 100 is provided with a chuck portion 13 for holding the to-be-fused member 3 such as a stud bolt 3a. The configuration of the chuck portion 13 has a general chucking configuration. A slit 130 and a threaded portion 131 are provided on the outer periphery of the insertion port, and the threaded portion 131 is tightened by a female screw member 132. Is. On the other hand, a shunt wire 6 for discharging is connected to the rear end side of the electrode slide rod 100.

  The electrode slide rod 100 is provided with a step 101 slightly in front of the longitudinal center, and the diameter behind the step 101 is made smaller. The step 101 forms a front spring pressure switching lever contact portion 101a. The front spring pressure switching lever abutting portion 101 a comes into contact with the front surface of the front spring pressure switching lever 14, and the front spring pressure switching lever 14 is driven by the electrode slide rod 100 by pushing the electrode slide rod 100.

  Further, a retaining protrusion 107 is attached at a position slightly behind the longitudinal center of the electrode slide rod 100. When the electrode slide rod 100 moves forward, if it tries to move more than the necessary amount, the retaining projection 107 abuts on the later-described retaining projection abutting portion 102a of the electrode slide rod guide 102 and moves. Stop.

  An electrode slide rod guide 102 for holding the electrode slide rod 100 and guiding the movement of the electrode slide rod in the front-rear direction is provided at a substantially central position of the storage space in the cylinder 10. The electrode slide rod guide 102 has a guide hole for guiding the electrode slide rod 100 at the center.

  A rear spring stopper guide shaft 106 for guiding the rear spring stopper 124 is provided upright at the lower right corner and upper left corner of the rear end surface of the electrode slide rod guide 102. The stopper guide shaft 106 forms a middle step to form a rear spring contact surface 106a that prevents the rear spring stopper 124 from moving forward beyond a certain level.

  On the lower surface of the electrode slide rod guide 102, a leaf switch 15a as the first welding switch 15 and a switch push rod 103 are provided. The leaf switch 15a includes a switch lever 150 on the front side. The switch push rod 103 is held by a switch push rod holder 104 so that it can move back and forth. The switch lever 150 of the leaf switch 15a is pushed by moving the switch push rod 103 rearward, and the push button 151 of the leaf switch 15a is turned on.

  A step 108 is formed on the foremost end surface 108 b of the electrode slide rod guide 102. A block contact surface 108 a is formed by the step portion 108.

  Further, a slit-shaped protrusion protrusion contact portion 102 a is formed on the upper surface side of the electrode slide rod guide 102. The slit width of the retaining protrusion abutting portion 102 a is formed larger than that of the retaining protrusion 107.

  In this embodiment, a front spring pressure switching lever 14 for switching the pressure of the front spring 18 is provided. As shown in FIG. 3, the front spring pressure switching lever 14 has a shape in which a block 144 is provided on a part of the back surface 143 of the disc-shaped rotating plate 141 and the lever portion 140 is erected from the peripheral surface 155.

  A lever part restricting opening 146 is formed at a position corresponding to the lever part 140 in the upper part of the cylinder 10. The lever portion 140 protrudes from the lever portion restriction opening 146. The lever part 140 can be rotated from the upright state to the left and right by about 37 °. The amount by which the electrode slide rod 100 connected to the front spring pressure switching lever 14 can be pushed differs depending on whether the block 144 is provided on a part of the rotating plate 141 and the rotation of the front spring pressure switching lever 14.

As shown in FIG. 14, the lever part restricting opening 146 forms a first opening 147 that is opened as a long hole in the left-right direction, and is a long hole from the left and right ends of the first opening 147 toward the rear of the cylinder 10. The second opening 148 is formed continuously. In addition, a lever locking portion 149 is provided by slightly extending the opening toward the front of the cylinder 10 from the central portion and the left and right ends of the first opening portion 147.

  The electrode slide rod 100 passes through a hole 142 formed in the center of the rotation plate, and the rotation plate 141 is fitted in a mounting groove formed on the peripheral surface of the electrode slide rod 100. The rotating plate 141 rotates about the axis with respect to the electrode slide rod 100, but moves with the electrode slide rod 100 in the longitudinal direction of the electrode slide rod 100.

  A front spring 18 is disposed between the electrode slide rod guide 102 and the rotating plate 141 of the front spring pressure switching lever 14.

  In the present embodiment, setting is made such that a pressing force suitable for the use of a steel stud bolt 3a, a washer or the like is exhibited in a state where the lever portion 140 is tilted to the right. In addition, it is set to exert a pressing force suitable for the stud bolt 3a made of an aluminum material in a state where the lever portion 140 is tilted leftward.

  In the state where the lever portion 140 is tilted to the right, the block 144a of the front spring pressure switching lever 14 is moved to the step portion 108 of the electrode slide rod guide 102 from the initial state shown in FIG. The electrode slide rod 100 can be pushed in until it comes into contact with the block abutting surface 108a, the pushing amount of the front spring 18 is increased, and a strong rebound resilience can be obtained.

  In the state where the lever portion 140 is tilted to the left, the block 144a of the front spring pressure switching lever 14 is moved to the foremost end of the electrode slide rod guide 102 as shown in the pushed state shown in FIG. 9 from the initial state shown in FIG. The pushing amount of the front spring 18 is smaller than that in the state where it abuts on the surface 108b and is tilted to the right.

  Furthermore, the lever portion 140 is locked at the center position (that is, the electrode slide rod 100 does not slide backward even when the electrode slide rod 100 is pressed against the base material 2). This is because the second opening portion 148 is not formed at the center position, so that the lever portion 140 cannot slide backward and the electrode slide rod 100 connected to the lever portion 140 cannot slide backward.

  In this embodiment, in order to facilitate the relationship between the position of the lever part 140 and the electrode slide rod 100, the position A (left end position) for aluminum material is “weak” and the position B for iron material (right end position). ) Is marked as “strong” and in the center as “fixed”.

  A push rod 103 is provided behind the front spring pressure switching lever 14 in the cylinder 10. The push rod 103 is held by a push rod holder 104. Further, the push rod holding body 104 is provided integrally with the cylinder 10. The push rod 103 is further used to push a first welding switch 15 described later located behind the push rod 103.

  A first welding switch 15 (leaf switch 15a) is disposed behind the push rod 103. The first welding switch 15 is used as “automatic setting” in the present invention, and is energized while the protruding first switch lever 150 is pressed.

  A second welding switch 16 (leaf switch) is provided in the vicinity of the front base in the grip portion 11. The second switch lever 160 for energizing the second welding switch 16 protrudes from the gripping portion 11 to the outside, so that the operator holds the gripping portion 11 with one hand and pulls the trigger. It arrange | positions so that the lever 160 can be pushed. The second welding switch 16 in the present embodiment is not an essential configuration in the present invention, but a means provided for the convenience of work.

  In the present embodiment, similarly, although not essential in the present invention, the first welding switch 15 and the second welding switch 16 described above can be selectively switched during welding. As means for performing this selection (switching), a changeover switch 17 is provided at the upper part of the cylinder 10 as shown in FIG. The first welding switch 15 and the second welding switch 16 are switched by switching the switch lever 170 of the changeover switch 17 to the left and right. The switching of these switches is shown as the circuit of the capacitor discharge stud welding gun 1 in the discharge circuit of the circuit diagram of the portable capacitor discharge stud welding machine of FIG.

  A rear spring 19 is provided behind the electrode slide rod 100 in the cylinder 10 via a predetermined interval 126 (gap). A rear spring stopper 124 is attached to the front end of the rear spring 19, and a spring receiver 125 is provided at the rear end of the rear spring 19.

  The shunt wire 6 is coupled to the lower rear end of the cylinder 10. The rear spring stopper 124 is made of a metal plate and includes two stopper guide holes 124a corresponding to the rear spring stopper guide shaft 106 protruding from the lower right corner and the upper left corner of the rear end surface of the electrode slide rod guide 100. . When the spring stopper guide shaft 106 passes through the stopper guide hole 124a and the electrode slide rod 100 presses the rear spring stopper 124 against the urging force of the rear spring 19, the rear spring stopper 124 springs. It moves rearward along the stopper guide shaft 106.

  The spring receiver 125 has a recess 125a in which the rear spring 19 is fitted. The rear end of the spring receiver 125 is connected to the front end of the rear spring pressure adjusting knob 12.

  The rear spring pressure adjusting knob 12 has a knob 123 attached to the rear end of the rear spring pressure adjusting screw 120. The rear spring pressure adjusting screw uses a triple thread screw. The female screw hole 122 of the fixing plate 121 provided at the rear end of the cylinder 10 and the rear spring pressure adjusting screw are screwed together. With this configuration, the position of the spring receiver 125 can be greatly moved back and forth by slightly turning the knob 123.

In addition, the chuck | zipper part 13 in the front-end | tip of the capacitor | condenser discharge type stud welding gun 1 which concerns on a present Example can provide the sputter hider which covers the to-be-fused member 3 as shown, for example in FIG.
In FIG. 3, the description of the connection means for each of the first welding switch, the second welding switch, and the changeover switch is omitted. In the present embodiment, these are all shown in the circuit diagram of FIG. As shown, the wiring is made.

  As shown in the circuit diagram of FIG. 12, a capacitor and a charging circuit 7 and a discharging circuit 8 for the capacitor are provided. The charging circuit 7 includes a charging control device 70. The discharge circuit 8 includes a discharge control device 80 and a continuity detection device 81.

  The charging control device 70 in the charging circuit 7 adjusts and controls the charging voltage according to the voltage value set by the voltage adjustment knob 44.

  The conductivity detection device 81 in the discharge circuit 8 reads a measured voltage value in a contact state between the to-be-fused member 3 and the base material 2 from a voltage measurement unit (not shown), compares the measured voltage value with a preset reference voltage value, and is in a conductive state. Is detected and detected. When detected, a conduction detection signal is output to the discharge control device. If it is determined that there is no continuity, no continuity detection signal is output.

  The discharge control device 80 in the discharge circuit satisfies one of the discharge requirements by receiving a conduction detection signal from the conductivity detection device 81. If the setting of the changeover switch 17 is “automatic” (automatic circuit), the discharge control device 80 uses the first welding switch 15 to be on as a discharge requirement, and if it is “manual” (manual circuit), Turning on the welding switch 16 is a discharge requirement.

  With the above structure, the to-be-fused member 3 such as the stud bolt 3a can be brought into contact with the surface of the base material 2 in advance. Damage to the surface of the material 2 can be prevented in advance.

  A welding method using the capacitor discharge type stud welding gun according to the present embodiment configured as described above will be described below. The base material 2 is an aluminum plate, and the to-be-fused member 3 is an aluminum stud bolt 3a. The aluminum stud bolt 3a is a general one having a protrusion 30 at the center of the tip.

  First, the first stage is shown. As shown in FIG. 4, the stud bolt 3 a is attached to the chuck portion 13 of the capacitor discharge type stud welding gun 1. And the said protrusion 30 which is the front-end | tip part of the to-be-fused member 3 is made to contact the surface of the base material 2. FIG. At this stage, a gap 126 (gap) is formed between the rear spring stopper 124 and the rear portion of the electrode slide rod 100 as shown in the previous configuration description.

  Next, as shown in FIG. 5, when the capacitor discharge type stud welding gun 1 is pushed into the base material 2, the stud bolt 3a and the electrode slide rod 100 are pushed into the cylinder 10 as shown in FIG. The spring 18 is compressed.

  Then, the rear portion of the electrode slide rod 100 hits the spring stopper 124 pushed by the rear spring 19 (the gap 126 (gap) is eliminated between the rear spring stopper 124 and the rear portion of the electrode slide rod 100), and impact load is generated. To do. At this time, the first welding switch 15 is not turned on, and the spring elastic force of the front spring 18 and the impact load of the rear spring 19 immediately before that are applied, so that the protrusion 30 of the stud bolt 3a is not easily deformed. .

  In the third stage, as shown in FIG. 6, it is performed as a continuous operation from the second stage, and after the rear end portion 100a of the electrode slide rod 100 hits the spring stopper 124 in the second stage, Further, the electrode slide rod 100 is pressed against the spring stopper 124, and the rear spring 19 is compressed.

  Further, the block 144a of the front spring pressure switching lever 14 that moves together with the electrode slide rod 100 presses the push rod 103 interlocked with the first welding switch 15, the first welding switch 15 is turned on, and a discharge current is output. In this third stage, the pressing force of the stud bolt 3a against the base material 2 is greater than the pressing force of the second stage stud bolt 3a against the base material 2.

  In the fourth stage, as shown in FIG. 7, a molten pool 20 is formed between the stud bolt 3 a and the surface of the base material 2 by the output of the discharge current in the third stage. Until the molten pool 20 cools and solidifies, the block 144a, which is the switch pressing portion 144 of the electrode slide rod 100, collides with the end of the front spring pressure switching lever 14, and at the same time, the electrode slide rod 100 further applies impact load. It is transmitted to the stud bolt 3a and the base material 2. The molten pool 20 is cooled and solidified while receiving the load, and the welding is completed.

  The above embodiment will be described more specifically as a welding operation. First, the front spring pressure switching lever 14 is operated, and automatically set at either “strong” (iron) or “weak” (aluminum) lever position. And Next, when the electrode slide rod 100 is pushed in while the stud bolt 3a inserted in the chuck part 13 at the tip is in contact with the surface of the base material 2, the rear spring stopper 124 pushed by the rear spring is accelerated. The impact is applied to the tip of the stud bolt 3a, and a spring pressing force is further added. Since an appropriate distance (gap) is provided in advance between the rear spring stopper 124 and the rear end of the electrode slide rod 100, a large load is applied from the moment the electrode slide rod 100 hits the rear spring stopper 124. Then, the block 144a of the front spring pressure switching lever 14 hits the switch push rod 103, the first welding switch 15 is turned on, a large current is discharged from the capacitor, and the block 144a hits the end of the electrode slide rod guide to further increase the load. While being done, the stud bolt 3a which is the to-be-planted member 3 and the base material 2 are more reliably welded.

  As described above, the position of the end portion of the electrode slide guide 100 where the block 144a finally abuts differs depending on the lever position of either “strong” (iron) or “weak” (aluminum material). In a state where the lever is set to the “strong” (iron) position, the block 144a abuts against the block contact surface 108a formed by the stepped portion as shown in FIG. Further, in a state where the lever is set to the “weak” (aluminum) position, the block 144a hits the foremost position 108b as shown in FIG.

  As described above, according to the invention according to the present embodiment, the front spring 18 that constantly biases the electrode slide rod 100 forward and the rear end of the electrode slide rod 100 with a gap 126 (gap) therebetween are arranged. The front spring 18 presses the material to be welded 3 against the base material 2 immediately before the welding switch is turned on, that is, immediately before the discharge, and the rear spring stopper 124 is caused by the spring elasticity of the rear spring 19. When the electrode slide rod 100 is accelerated and collides, a large load acts on the stud bolt 3a and the like for the first time, so that the deformation of the projection 30 of the stud bolt 3a is suppressed, and the current density per unit area does not decrease during discharge. , Efficient welding can be made possible.

  The electrode slide rod 100 includes a block 144a as a switch pressing portion 144 that turns on the first welding switch 15 by contact. When the block 144a of the electrode slide rod 100 turns on the first welding switch 15, a discharge current is output. Then, the block 144a, which is a part of the electrode slide rod 100, accelerates and collides with the contact portion of the welding gun body 1a at the timing until the molten pool 20 solidifies, so that the pressing force of the front spring 18 and the rear spring 19 And the impact load of a part of the electrode slide rod 100 is applied to the welded portion, and the to-be-fused member 3 can be firmly fixed to the base material 2.

  In this embodiment, the welding gun main body 1a is provided with a male screw shaft 120, which is a spring pressure adjusting screw in the rear spring pressure adjusting knob 12 for adjusting the resilience elastic force of the rear spring 19, as a triple thread. However, the spring pressure adjusting screw according to the present invention is not limited to the three-thread screw as in the above-described embodiment, but may be another multi-thread such as a double-thread screw.

  The capacitor discharge stud welding gun 1 according to the present embodiment constitutes a portable capacitor discharge stud welding machine 4 shown as an example in FIG. The capacitor discharge type stud welding gun 1 and the welding machine main body 40 are connected by a cable 6 for charging and discharging and supplying power to switches. The cable 6 in the capacitor discharge type stud welding gun 1 in the embodiment has a configuration in which the cable 6 is led out from a cable opening 110 formed in the lower part of the gripping part 11 and connected to the front side of the welding machine main body 40.

  Of the portable capacitor discharge type stud welding machine 4 using the capacitor discharge type stud welding gun 1 according to the present embodiment, the welding machine body 40 will be described in particular. The portable capacitor discharge type stud welding machine 4 is merely an example, and the present invention is not limited to the following examples.

  As shown in FIG. 13, the welding machine body 40 in the portable capacitor discharge type stud welding machine 4 according to the embodiment includes a caster 49 at the bottom, a handle 47 at the back, and a power supply cable 48. A continuity confirmation lamp 41, a charge confirmation lamp 42, and a voltage adjustment knob 44 corresponding to each material (aluminum, iron) are provided. The voltage value changes stepwise as the voltage adjustment knob 44 rotates. Around the voltage adjustment knob 44, there are provided an aluminum material adjustment range display unit 45 and an iron material adjustment range display unit 46 that show an adjustment range of an appropriate voltage value between the aluminum material and the iron material step by step.

  The portable capacitor discharge type stud welding machine 4 according to the present embodiment includes the welder body 40 and the capacitor discharge type stud welding gun 1 according to the above embodiment. In addition to the convenience, the above-described excellent effects of the capacitor discharge type stud welding gun 1 are utilized, that is, the pressing force of the front spring 18, the impact load of the rear spring 19, and the partial impact load of the electrode slide rod 100. Thus, it is possible to realize the welding of the to-be-fused member 3 and the base material 2 to the welded portion.

  In addition, since the capacitor discharge type stud welding gun 1 is very lightweight, the welding machine body 40 in the present embodiment supports and supports means (such as an arm) for suspending the capacitor discharge type stud welding gun 1. No means (such as a welding gun holder). However, means for suspending or supporting a welding gun in a normally portable stud welder can be provided as needed. Further, for example, a hook or the like necessary for the arm can be provided in the capacitor discharge type stud welding gun 1.

  In the above-described embodiment, the mechanism of the present invention is always established in the automatic setting state. On the other hand, when welding is performed by a manual operation that operates the second welding switch 16, the operation and effect are produced by measuring the timing of the manual operation and pressing the second switch lever 160 with a finger. This manual operation mechanism is not essential in the present invention. Therefore, for example, as another embodiment of the present invention, the second welding switch 16 used for the manual setting of the above embodiment is removed. You can also.

  Further, according to the present invention, the to-be-planted member 3 is not limited to the stud bolt 3a shown in the above embodiment, and as shown in FIGS. 15 to 16, the iron washer 3c, the corrugated wire 3b and the like are to be melted. It can be used as the planting member 3.

  Further, according to the above embodiment, the step 108 is formed on the electrode slide rod guide 102 so that the block contact surface 108a or the foremost end surface 108b is used as the contact portion of the welding gun body 10a. Not only this but the member provided with the contact part of the welding gun main body 10a which is independent independently can also be provided.

It is a front view which shows the capacitor discharge type stud welding gun which concerns on the Example of this invention. It is a right view which shows the capacitor discharge type stud welding gun which concerns on the Example of this invention. It is the partial cross section figure which shows the capacitor discharge type stud welding gun which concerns on the Example of this invention, and its partial enlarged view. It is explanatory drawing which shows the 1st step of the welding process using the stud welding gun which concerns on the Example of this invention. It is explanatory drawing which shows the 2nd step of the welding process using the stud welding gun which concerns on the Example of this invention. It is explanatory drawing which shows the 3rd step of the welding process using the stud welding gun which concerns on the Example of this invention. It is explanatory drawing which shows the 4th step of the welding process using the stud welding gun which concerns on the Example of this invention. It is a perspective explanatory view showing the relation between the electrode slide rod and the electrode slide rod guide in the first stage during the aluminum welding process of the stud welding gun according to the embodiment of the present invention. It is a perspective explanatory view showing the relation between the electrode slide rod and the electrode slide rod guide in the fourth stage during the aluminum welding process of the stud welding gun according to the embodiment of the present invention. It is a perspective explanatory view showing the relation between the electrode slide rod and the electrode slide guide in the first stage during the iron welding process of the stud welding gun according to the embodiment of the present invention. It is a perspective explanatory view showing the relation between the electrode slide rod and the electrode slide rod guide in the fourth stage during the iron welding process of the stud welding gun according to the embodiment of the present invention. It is a circuit diagram of the stud welding gun concerning the example of the present invention. It is explanatory drawing which shows the capacitor discharge type stud welding machine provided with the stud welding gun which concerns on the Example of this invention. It is a top view which shows the front-end | tip part of the stud welding gun which concerns on the Example of this invention. It is the perspective view which shows the state which mounted | wore the iron washer bit used in the Example of this invention to the iron washer bit, and (b) is the perspective view which shows the bit for corrugated wires. It is explanatory drawing which shows welding operation of the corrugated wire using the stud welding gun which concerns on the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capacitor discharge type stud welding gun 1a Welding gun main body 10 Cylinder 100 Electrode slide rod 100a Rear end part 101 Step 102 Electrode slide rod guide 102a Stop protrusion projection contact part 103 Switch push rod 104 Push rod holder 105 Sputter hider 106 For stopper Guide shaft 107 Detaching projection 108 Step 108a Block contact surface 108b Foremost end surface 11 Holding portion 110 Cable opening 12 Rear spring pressure adjusting knob 120 Male screw shaft 121 Fixing plate 122 Female screw hole 123 Knob 124 Rear spring stopper 124a Stopper Guide hole 125 Spring receiver 125a Recessed portion 126 Spacing (gap)
13 Chuck part 14 Front spring pressure switching lever 140 Lever part 141 Rotating plate 142 Hole part 143 Back face 144 Switch pressing part 144a Block 145 Peripheral surface 146 Lever part restriction opening part 147 First opening part 148 Second opening part 149 Lever locking Part 15 First welding switch (leaf switch)
150 switch lever 151 push button 155 peripheral surface 16 second welding switch 160 second switch lever 17 changeover switch 170 switch lever 18 front spring 19 rear spring 2 base material 20 molten pool 3 welded member 3a stud bolt 3b corrugated wire 3c washer 30 Projection 4 Portable capacitor discharge type stud welding machine 40 Welding machine main body 41 Charge confirmation lamp 42 Discharge confirmation lamp 43 Power switch 44 Voltage adjustment knob 45 Aluminum material adjustment range display section 46 Iron material adjustment range display section 47 Handle 48 Power supply cable 49 Caster 50 Bit for iron washer 51 Bit for corrugated wire 6 Shunt wire 7 Charging circuit 70 Charge control device 8 Discharge circuit 80 Discharge control device 81 Continuity detection device

Claims (9)

Capacitor discharge having an electrode slide rod slidable in the front-rear direction and a spring for biasing the electrode slide rod forward in the welding gun body, and a chuck portion for holding a to-be-fused member at the tip of the electrode slide rod Type stud welding gun,
An electrode slide rod guide for guiding the electrode slide rod;
The spring is a front spring disposed in front of the electrode slide rod guide, and a rear spring disposed via a rear spring stopper with a space behind the rear end of the electrode slide rod,
Along with the movement of the electrode slide rod to the rear, it is configured with a switch pressing part that is driven by the electrode slide rod and turns on the welding switch,
With the front spring pressing the electrode slide rod forward by the spring elastic force, the electrode slide rod acceleratedly collides with the rear spring stopper against the spring elastic force of the rear spring, and the switch pressing portion that is driven by the electrode slide rod has When the welding switch is turned on, a discharge current is output, and at the timing until the molten pool solidifies, a part of the electrode slide rod or a part that follows this accelerates to collide with the contact part of the welding gun body. Capacitor discharge type stud welding gun.   2. The capacitor discharge type stud welding gun according to claim 1, wherein the contact portion of the welding gun body is an electrode slide rod guide.   A spring pressure switching means is provided in the welding gun body, and the spring pressure switching means includes a rotating plate and a block disposed on the rear surface of the rotating plate, and the rotation is based on the center axis of the slide rod of the rotating plate. The capacitor discharge type stud welding gun according to claim 1 or 2, wherein the rear surface of the block or the rotating plate selectively functions as a switch pressing portion by movement.   4. The capacitor discharge according to claim 1, wherein the welding gun body includes a spring pressure adjusting screw for adjusting a resilience resilience of the rear spring, and the spring pressure adjusting screw is a multi-threaded screw. Type stud welding gun.   5. The capacitor discharge type stud welding gun according to claim 1, further comprising a front spring pressure switching lever that switches the spring elastic force of the front spring in a stepwise manner.   A portable capacitor discharge type stud welding machine comprising the capacitor discharge type stud welding gun according to claim 1.   A discharge circuit and a charging circuit are provided, and the discharge circuit includes a circuit that does not require a manual operation of the welding switch as a discharge requirement and that requires a pressing operation of the electrode slide rod as a discharge requirement. The described portable capacitor discharge type stud welding machine.   The discharge circuit includes a discharge control device and a conductivity detection device, the conductivity detection device outputs a conduction detection signal to the discharge control device, and the discharge control device includes the conductivity detection signal in a discharge condition. Or the portable capacitor | condenser discharge-type stud welding machine of 7 description. The welding gun body includes an electrode slide rod slidable in the front-rear direction, a spring that biases the electrode slide rod forward, and a chuck portion that holds the to-be-fused member at the tip of the electrode slide rod. The body includes an electrode slide rod guide that guides the electrode slide rod, and the spring includes a front spring disposed in front of the electrode slide rod guide and a rear spring spaced from the rear end of the electrode slide rod. Using a capacitor discharge type stud welding gun with a switch pressing part that turns on the welding switch following the electrode slide rod as the electrode slide rod moves rearward as a rear spring arranged via a stopper,
With the front spring pressing the electrode slide rod forward by the spring elastic force, the electrode slide rod acceleratedly collides with the rear spring stopper against the spring elastic force of the rear spring, and the switch pressing portion that is driven by the electrode slide rod By turning on the welding switch, a discharge current is output, and at the timing until the molten pool solidifies, a part of the electrode slide rod or a part that follows this accelerates and collides with the contact part of the welding gun body, A capacitor discharge type stud welding method, wherein a to-be-fused member is welded to a base material.

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