JP2512293Y2 - Positioning pin with component detection function - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning pin having a positioning function for welding a part or the like to a base material and a function for detecting the presence or absence of the part or the like.

[0002]

2. Description of the Related Art In a conventional welding machine or the like, a positioning pin is usually used when welding parts such as nuts to predetermined positions of a base material. FIG. 3 shows an example thereof, in which the base material 3 is placed on the lower electrode 1, and the positioning pin 5 is fixed from below the lower electrode 1 so as to penetrate therethrough. By pressing the upper electrode 9 from above the fitted nut 7 and passing a welding current, the nut 7 is resistance-welded onto the base material 3.

As means for detecting the presence or absence of the nut 7 after welding, a detection jig 15 is fixed to a rod 13 protruding from a cylinder device 11 which is separately provided, and a proximity switch is provided at the tip of the detection jig 15. Is provided, and the cylinder device 11 is driven by a fluid obtained from a fluid source (not shown) to cause the rod 13 to project so that the detection sensor 17 electrically detects the presence of the nut 7. Are known.

FIG. 4 is a schematic view showing another detecting means,
In this example, the obtained product is in a hermetically sealed state consisting of two parts, an upper housing 19 and a lower housing 21, and the nut 7 is welded to the lower housing 21 located in the hermetically sealed space. There is. The jig for detecting the presence or absence of the nut 7 after welding includes a substrate 23, a tubular body 25 fixed to the substrate 23, and a detection pin 27 vertically penetrating the substrate 23 and the tubular body 25. The detection pin 27 includes a large-diameter portion 27a formed in the middle thereof, and a positioning pin 29 separately provided on the substrate 23 adjacent to the tubular body 25. A spring 31 is inserted between the large diameter portion 27a and the substrate 23.

When the presence or absence of the nut 7 is detected, the detection pin 27
When the tip end portion 27b of the detection pin 27 is inserted into the hole portion 21a of the lower housing 21, the step portion 27c of the detection pin 27 abuts on the bottom portion of the nut 7 to stop the detection pin 27, and further the substrate 23
As the detection pin 27 moves relatively downward with the upward movement of
The movement of the detection pin 27 is detected by, for example, the limit switch 33.
The presence of the nut 7 can be confirmed by detecting the switch piece 33a.

[0006]

However, among such conventional positioning and detecting means for parts and the like, particularly in the example shown in FIG. 3, the positioning pin 5 of the nut 7 and the presence or absence of the nut 7 are provided. Since the detection sensor 17 as the detection means must be provided separately, the overall configuration is complicated, and the operation of the cylinder device 11 and the like when detecting the presence / absence of a component is complicated, which is also disadvantageous in terms of cost. There was a drawback that there was.

Further, in the case of the example shown in FIG. 4, it is necessary to provide a detection pin 27 for detecting the presence or absence of the nut 7 separately from the positioning pin 29 as in the case of FIG. Since the nut 7 is in the enclosed space surrounded by the upper housing 19 and the lower housing 21,
Even if the nut 7 is missing, the detection pin 27 will move downward and limit
Welding operation is performed based on the detection signal of the switch switch 33.
However, even if welding defects or missing parts of the nut 7 are confirmed, the product itself cannot be reworked and the defective product cannot be repaired. . In particular, as shown in Fig. 4, the product is the upper housing.
The bag 19 and the lower housing 21 form a bag.
If it is, check the existence of the nut 7 completely.
It is difficult to find a defective product with missing nut 7.
It often goes to the next process along with other good products.
Yes, there are problems in the automatic welding process using robots etc.
Has become .

Therefore, the present invention solves the problem of the conventional positioning pin, and has a function of positioning a part or the like at the time of welding with one part, a function of detecting the presence or absence of the part, and a part. Welding operation is not performed in case of missing item
It is an object of the present invention to provide a positioning pin having the functions described above and having a simplified structure.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a peripheral edge of a hole opened at a predetermined position of a base material.
When welding parts such as nuts to the hole, one side of the hole
In the positioning pin that determines the welding position of the component by inserting the pin from the above, the positioning pin includes a pin main body made of an insulating member, and a detection sensor inserted and fixed in a hollow portion formed inside the pin main body. And inserting the positioning pin into a hole opened at a predetermined position of the base material.
By doing so, the function of positioning the component at the time of welding and the function of detecting the presence / absence of the component are combined.

According to this structure, the positioning pin comprises the pin body made of an insulating member and the detection sensor inserted and fixed in the hollow portion formed inside the pin body. Open in place on the base metal
By inserting the mouth pore part, on the positioning of the nuts welded parts can be implemented, the prior welding
Performing detection operation to confirm the presence of welded parts ,
The defective product that the part is missing is the next stage along with other good products.
It can be prevented from flowing into the process .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a positioning pin and a detecting means having a detecting function according to the present invention will be described in detail below with reference to the drawings by attaching the same reference numerals to the same components as those of the conventional configuration. .

FIG. 1 shows a positioning pin 35 according to this embodiment.
FIG. 4 is a cross-sectional view showing the structure of the positioning pin 35, which has a pin body 37 made of an insulating member and a detection sensor 3 inserted and fixed in a hollow portion formed inside the pin body 37.
9 and 9. A conductor 39a is connected to the detection sensor 39.

A ceramic or a reinforced plastic material is used as the pin body 37 in terms of hardness, and a proximity switch is used as the detection sensor 39. Further, if necessary, an insulating resin material can be filled in the hollow portion formed between the pin body 37 and the detection sensor 39.

FIG. 2 shows an example of use of the positioning pin 35. In this example, the product is a hermetically sealed product consisting of two parts, an upper housing 19 and a lower housing 21, and the lower electrode 1 is first assembled when assembled. The lower housing 21 is placed on the upper portion of the lower electrode 1, and the positioning pin 35 according to the present embodiment is provided from below the lower electrode 1 with the hole portion 2 opened in the lower housing 21.
It is made to pass through the inside of 1a and is projected upward, and the detection sensor 39 in this positioning pin 35 makes it a welding part.
After confirming the existence of the nut 7, the positioning pin 3
By pressing an upper electrode (not shown) from above the nut 7 fitted to the member 5 to supply a welding current, the nut 7 is resistance-welded to the peripheral portion of the hole 21 a of the lower housing 21. Then, another positioning pin 29 projecting from one end of the lower electrode 1 is inserted into the hole formed in the flange 19a of the upper housing 19 and the upper housing 19
By welding to the lower housing 21 at the welding portion 20, a sealed product having the nut 7 welded therein is completed. The other positioning pin 29 is an indispensable constituent element.
However, the positioning pin 35 according to the present embodiment does not
Based on the lower housing 21 whose position is determined in
When the upper housing 19 is welded to the lower housing 21,
This method can be used. That is, the positioning pin 3
5 not only has a positioning function for welding parts, but also has a lower housing
Also has a function of positioning the upper housing 19 with respect to the guide 21.
Have

When the detection sensor 39 is composed of a proximity switch, the conductor 3 is placed under the condition that the nut 7 is located near the detection sensor 39 as shown in FIG.
When a high frequency voltage is applied to the detection sensor 39 via 9a, the high frequency output generated from the detection sensor 39 hits the nut 7, which is a metal body, to generate an eddy current in the metal, and the eddy current is further generated around the nut 7. A reverse magnetic field is generated. This reverse magnetic field has a function of cutting off the high frequency output from the detection sensor 39, and by such a function,
It becomes possible to detect the presence of the nut 7.

Therefore, when it is confirmed that the nut 7 is missing before welding by the positioning pin 35 shown in FIG.
The nut 7 can be refilled and welded before the upper housing 19 is welded to the lower housing 21, and the product itself can be reworked, which is advantageous in that no defective product is produced. . Further lack of welded parts
Defective products that have been produced flow to the next process along with other good products
It is possible to prevent that .

As is clear from the above description, the positioning pin 35 according to the present invention includes the nut 7 and the lower housing 2.
It is possible to have both the function as a positioning pin when welding to No. 1 and the function of detecting the presence or absence of the nut 7 after welding, and it is useful when applied to various welding machines.

[0018]

As described in detail above, the positioning pin according to the present invention is composed of a pin body made of an insulating member and a detection sensor inserted and fixed in a hollow portion formed inside the pin body. Therefore, the positioning pin can be used to position the part when the part is welded, and a detection operation for confirming the presence or absence of the part can be performed before welding. .

Therefore, it is not necessary to separately provide the positioning pin and the presence / absence detecting means for the parts as in the conventional case, and the effect is obtained that the overall structure is simplified and the manufacturing cost is reduced. .

Further, when the locating pin confirms that the parts to be welded are missing during the welding work, it becomes possible to immediately replenish the parts and perform the welding work.
If it is possible to perform the product itself rework and repair work door
By the way, defective products with missing welded parts are
In addition, the great effect of preventing it from flowing into the next step is exhibited.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a positioning pin according to the present invention.

FIG. 2 is a sectional view of an essential part showing an example of use of the positioning pin of the present invention.

FIG. 3 is a schematic view showing an example of a conventional positioning pin and a component presence / absence detection mechanism.

FIG. 4 is a schematic view showing another example of a conventional component presence / absence detection mechanism.

[Explanation of symbols]

1 ... Lower electrode, 7 ... Nut, 19 ... Upper housing, 2
1 ... Lower housing, 35 ... Locating pin, 37 ... Pin body, 39 ... Detection sensor.

Claims (1)

(57) [Scope of utility model registration request] 1. A peripheral edge of a hole opened at a predetermined position of a base material.
When welding parts such as nuts to the hole, one side of the hole
In the positioning pin for determining the welding position of the component by inserting the component from above, the positioning pin includes a pin body made of an insulating member, and a detection sensor inserted and fixed in a hollow portion formed inside the pin body. The positioning pin of the base material.
Welding by inserting it into a hole opened at a predetermined position
Positioning pins having a positioning function of the parts, characterized in that gave combination of the detection function for confirming the presence or absence of the component, the part detection at the time.