JP6528171B2 - Projection welding equipment - Google Patents

Description

  The present invention relates to a projection welding apparatus for welding a projection member provided with a projection (welding projection) to a substrate.

  The projection welding apparatus arranges the base material on the lower electrode, fits the projection member to the guide pin of the lower electrode protruding through the base material, descends the upper electrode and abuts on the projection member, And the upper electrode sandwiches the base material and the projection member, and an electric current is supplied to the upper electrode, the projection member, the base material, and the lower electrode to weld the projection member to the base material. If the members are fitted and welded to the guide pins of the lower electrode upside down, welding becomes defective, and parts in which the projection member is welded to the substrate become defective.

  Conventionally, in order to solve such a point, as shown in FIGS. 6 and 7, an air passage 54 having an exhaust port 53 formed on the end face of the upper electrode 51 on the projection nut 52 side is used. The air sensor 56 is provided in the passage 54, and the output of the air sensor 56 is input, and there is a device provided with a front / back judgment device that notifies by the judgment device 57 when the projection nut 52 is supplied reversely.

  In such a case, when the projection nut 52 shown in FIG. 6 is normally supplied, the exhaust port 53 of the upper electrode 51 is closed by the guide pin 58 and compressed air is sent from the air source 55. However, there is almost no air flow in the air passage 54, and as shown in FIG. 7, when the projection nut 52 is supplied in the reverse direction, the end face of the upper electrode 51 is in contact with the projection 59 of the projection nut 52. There is a gap between the end face of the upper electrode 51 and the projection nut 52, and when compressed air is sent from the air source 55, the compressed air flows from the discharge port 53 of the upper electrode 51 to the end face of the upper electrode 51 and the projection nut 52. Since the air is discharged to the outside from the gap between the air and air, air flows in the air passage 54. It was judged of the front and back of a projection nut by the difference in the flow of the air of such an air passage.

JP 06-238460 A

  In the above, although it is possible to judge the front and back of the projection nut, the projection nut fails to supply the projection nut from the nut feeder, that is, the air flow in the air passage in the case of a missing projection nut There is a problem that it can not be judged in the case of a shortage because it is substantially the same as the case of being supplied.

  An object of the present invention is to solve the above-mentioned problems, and to provide a welding device for a projection member which can judge not only the front and back of the projection member but also in the case of a shortage.

  The welding device for a projection member according to the present invention, which was made to solve the above problems, arranges a base material on a fixed electrode, supplies the projection member to a welded portion of the base material, operates a movable electrode, and In a projection welding apparatus in which a projection member and a base are held between movable electrodes and an electric current is supplied to the movable electrode, the projection member, the base and the fixed electrode for welding, an air source is connected to the movable electrode and the movable electrode It branches and forms two discharge ports in the end surface by the side of a projection member, and one discharge port is formed in the position closed by the projection member, and at the position where at least one copy of the other discharge port is exposed from a projection member A pressure sensor is provided in the formed air passage, and the judgment unit judges the output of the pressure sensor on the front and back of the projection member and Characterized in that a goods determination device.

The determination device sets the air pressure at a lower value than in the case where the projection member is normally supplied and sets a higher air pressure than in the reverse case to the first reference value, and is a higher value than when the projection member is normally supplied. If the air pressure of the pressure sensor is lower than the first reference value, the judgment unit judges that the projection member is upside down, and the pressure sensor is the pressure sensor. If the value of is between the first reference value and the second reference value, the determination unit determines that the projection member is normal, and if the value of the pressure sensor is greater than or equal to the second reference value, the determination unit projects the projection It is preferable to determine that the member 7 is out of stock, and this is the invention according to claim 2.

In the invention of claim 1, the air source is connected to the movable electrode, branched in the movable electrode, and two discharge ports are formed on the end face on the projection member side, and one discharge port is closed by the projection member The pressure sensor is provided in an air passage formed at a position where at least a part of the other discharge port is exposed from the projection member, and the judgment unit judges the output of the pressure sensor in the judgment unit Since the determination device is provided, not only the front and back of the projection member but also the shortage can be determined. Therefore, it is possible to prevent the welding defect of the part having the projection member welded.

In the invention of claim 2, determination system, at a lower value than when the projection member is normally supplied, and set the air pressure higher than that of the upside value to the first reference value, the projection member is normally supplied If the air pressure lower than in the case of an out-of-stock product is set to the second reference value, and if the value of the pressure sensor is less than the first reference value, the judgment unit If the pressure sensor value is between the first reference value and the second reference value, the determination unit determines that the projection member is normal, and the pressure sensor value is greater than the second reference value. In this case, since the determination unit determines that the projection member is out of stock, the determination can be made reliably.

FIG. 1 is a side view showing an embodiment of the present invention. FIG. 2 is a back view of the washer of FIG. 1; In the embodiment of the present invention, a partial cutaway side view showing a state where a washer has been supplied normally. FIG. 4 is a partially cutaway side view showing the washer of FIG. 3 being supplied upside down. The partially cutaway side view which shows the case where the washer of FIG. 3 is out of stock. Sectional drawing of the state to which the conventional projection nut was supplied normally. Sectional drawing of the state in which the conventional projection nut was supplied upside down.

Hereinafter, a preferred embodiment of the present invention will be described based on FIGS. 1 to 5.
Reference numeral 1 denotes a welding apparatus. The welding apparatus 1 arranges the base material 3 on the lower electrode 2 which is a fixed electrode, and fit the guide pins 4 of the lower electrode 2 into the through holes 5 of the base material 3. The projection washer 7 with a protrusion is supplied by a parts feeder (not shown) and fitted to the guide pin 4, the upper electrode 8 which is a movable electrode is lowered, and the guide pin 4 is inserted into the insertion hole 9 of the upper electrode 8 Then, the projection washer 7 and the base material 3 are held between the upper electrode 8 and the lower electrode 2.

  10 is an air source for sending air into the upper electrode, and the air source 10 is connected to the upper electrode 8, is branched inside the upper electrode 8, and two discharge ports 11 provided on the end face on the projection washer 7 side. , 12 is formed so that the air passage 13 is formed, and one of the two discharge ports 11 and 12 has an outlet 11 inside the outer diameter of the projection washer 7, that is, the projection washer 7 The other exhaust port 12 is formed at a position where at least a portion thereof is outside the outer diameter of the projection washer 7, ie, at a position where at least a portion is exposed from the projection washer 7.

  Reference numeral 14 denotes a pressure sensor that detects the air pressure in the air passage, and reference numeral 15 denotes a determination unit that receives the output of the pressure sensor and determines the front and back sides and out-of-stock of the projection washer 7.

  Next, with reference to FIG. 3 to FIG. 5, a method of judging the front and back of the projection washer 7 according to the present invention and the shortage will be described.

  As shown in FIG. 3, when the projection washer 7 is supplied in a normal state and the upper electrode 8 descends and abuts on the projection washer 7, one discharge port 11 is closed by the projection washer 7 and the other discharge port Since at least a part of 12 is not blocked by the projection washer 7 and exposed to the outside, when compressed air is sent from the air source 10 in this state, the air from the exposed portion of the other outlet 12 is Discharge.

  Further, as shown in FIG. 4, when the projection washer 7 is supplied in the reverse state, the upper electrode 8 abuts on the projection 6 of the projection washer 7, so the end face of the upper electrode 8 on the projection washer 7 side There is a space between the projection washer 7 and the two exhaust ports 11 and 12 communicate with the outside, so when compressed air is sent from the air source 10, compared to the case of the normal state. More air is exhausted, more air flows in the air passage, and the air pressure becomes lower.

  Furthermore, as shown in FIG. 5, when the product is out of stock due to the supply failure of the projection washer 7, the two exhaust ports 11 and 12 are both blocked by the base material 3, so compressed air is sent from the air source 10. In this case, since the air is hardly exhausted, less air flows as compared with the normal case, and the air pressure becomes high.

Next, the method of determining whether the projection washer 7 is normal or reverse and out of stock will be described. The air pressure of a value lower than when the projection washer 7 is supplied normally and higher than the case of reverse is set as the first reference value. The air pressure of a value higher than that of the case where the projection washer 7 is normally supplied and lower than that of the case where the product is out of stock is set as the second reference value and stored in the determination unit 15.

  When compressed air is sent, if the value of the pressure sensor 14 is less than the first reference value, the determination unit 15 determines that the projection washer 7 is upside down, stops welding, and issues an alarm.

  When the value of the pressure sensor 14 is between the first reference value and the second reference value, the determination unit 15 determines that the projection washer 7 is normal and continues welding.

  If the value of the pressure sensor 14 is equal to or greater than the second reference value, the determination unit 15 determines that the projection washer 7 is out of stock, stops welding and issues an alarm.

  The present invention is not limited to the above embodiment. For example, the projection washer 7 may be a projection member such as a projection nut provided with a projection on the back surface, and one discharge port 11 is a guide pin insertion hole 9. You may use

  As described above, according to the present invention, the movable electrode is provided with a branched air passage provided with two discharge ports at the end surface on the side of the projection member, and one discharge port is formed at a position closed by the projection member. Since the other discharge port is formed at a position where at least a part is exposed from the projection member, not only the front and back of the projection member but also a shortage can be determined. An alarm can be issued, and welding defects of parts welded to the projection member can be prevented.

  In addition, the determination device sets the first reference value and the second reference value, and determines that the pressure sensor value is less than the first reference value as the reverse of the front and back, and the first reference value and the second reference value. In the case of between the reference values, it is judged as normal, and when it is the second reference value or more, it is judged as out-of-stock, so that the case of normal, upside down, and out-of-stock can be judged certainly.

DESCRIPTION OF SYMBOLS 1 welding apparatus 2 movable electrode 3 base material 7 projection member 8 fixed electrode 10 air source 11 exhaust port 12 exhaust port 13 air passage 14 pressure sensor 15 determination unit

Claims (2)

    The base material is disposed on the fixed electrode, the projection member is supplied to the welded portion of the base material, and the movable electrode is operated to hold the projection member and the base material between the fixed electrode and the movable electrode. An air source is connected to a movable electrode in a projection welding apparatus in which current is supplied to a base material and a fixed electrode for welding, the air source is connected to the movable electrode, branched in the movable electrode, and two discharge ports are formed on an end face on the projection member side A pressure sensor is provided in the air passage formed at a position where at least a part of the other discharge port is exposed from the projection member, and the output of the pressure sensor What is claimed is: 1. A projection welding apparatus comprising: a device for judging the front and back of a projection member to be judged; The determination device sets the air pressure at a lower value than in the case where the projection member is normally supplied and sets a higher air pressure than in the reverse case to the first reference value, and is a higher value than when the projection member is normally supplied. If the air pressure of the pressure sensor is lower than the first reference value, the judgment unit judges that the projection member is upside down, and the pressure sensor is the pressure sensor. If the value of is between the first reference value and the second reference value, the determination unit determines that the projection member is normal, and if the value of the pressure sensor is greater than or equal to the second reference value, the determination unit projects the projection The projection welding apparatus according to claim 1, wherein the member is determined to be out of stock.

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