JP7377404B2 - jig - Google Patents

Description

The present invention relates to a jig. More specifically, the present invention relates to a jig for fixing a workpiece in dip coating, which has a substantially spherical head and a shaft extending from the head.

Conventionally, partial painting, in which only predetermined painted areas are painted, has been used for painting automobile parts and the like. Patent Document 1 discloses a partial painting device for performing this partial painting.

JP2017-23905A

In the technique disclosed in Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2017-23905), the hanging jig rotates about the long axis as the rotation axis from a state in which the object to be treated is suspended. For this reason, there is a problem that the installation space becomes relatively large, and the quantity that can be processed in one operation is limited.

The present invention aims to increase the number of coatings that can be processed in one operation in dip coating, and to improve the processing effect.

The jig according to the present invention is a jig for fixing a workpiece in dip coating, which has a substantially spherical head and a shaft extending from the head, and is formed into an annular shape when viewed from above. a frame; and a plurality of fixings fixed to the frame at predetermined intervals and to which the object to be processed can be detachably attached such that the shaft of the object to be processed is horizontal or the tip of the shaft is directed above horizontal. It is characterized by comprising a section.

Further, the jig according to the present invention may be characterized in that the fixing part can fix the object to be processed in a state where the shaft part is angled with respect to the diametrical direction of the frame.

Further, in the jig according to the present invention, the fixing portion is provided at a plate portion that comes into contact with the vicinity of the apex of the head of the object to be processed, and on both sides of a portion of the head to which the shaft portion is connected. It may also be characterized by comprising a pair of hook portions that abut against each other.

According to the present invention, in dip coating, it is possible to increase the amount that can be processed in one operation and improve processing efficiency.

FIG. 1 is a plan view of a jig according to an embodiment of the present invention. FIG. 2 is a side view of the jig according to the embodiment of the present invention. FIG. 3 is a diagram showing how the jig according to the embodiment of the present invention is used. FIG. 4 is a diagram showing an apparatus according to an embodiment of the invention. FIG. 5 is a diagram showing a state in which the object to be processed is attached to the fixing part. FIG. 5(a) is a top view of the fixing part. FIG. 5(b) is a front view of the fixing part. Further, FIG. 5(c) is a side view of the fixing portion.

As shown in FIG. 1, the jig 1 is a workpiece 100 (hereinafter sometimes referred to as a ball stud 100) having a substantially spherical head 101 and a shaft 102 extending from the head 101 in dip coating. is fixed to the frame 10, which is formed into an annular shape when viewed from above, and is fixed to the frame 10 at a predetermined interval, and is covered so that the shaft portion 102 of the workpiece 100 is horizontal or the tip of the shaft portion is directed above the horizontal. It includes a plurality of fixing parts 20 to which the processing object 100 can be detachably attached.

In the jig 1, the fixing part 20 can fix the workpiece 100 in a state where the shaft part 102 is at an angle with respect to the diametrical direction of the frame 10.

[Description of device]
First, the coating device will be explained below. FIG. 3 shows a state in which the jigs 1 are stacked in multiple stages. FIG. 4 shows a state in which the stacked jigs 1 are stored in a dipping tank 220 and a shaking-off tank 230. The coating apparatus 200 is divided into a dipping tank 220 and a shaking tank 230, and the dipping tank 220 is composed of a cylindrical main tank and a sub-tank.
When painting the object to be treated 100 using the jig 1, the Geomet treatment liquid 300 is circulated from the sub tank to the main tank using the pump P. At the same time, the level of the Geomet processing liquid 300 in the immersion tank 220 is maintained at a constant height by causing the Geomet processing liquid 300 to overflow into the grooves around the entire circumference of this tank. In other words, the liquid level that drops during shake-off is set so that it overflows into the groove by the next immersion using a constantly operating pump, so that even if the volume of the jig changes, the immersion depth is always the same. It is a structure that can ensure the following.

Geomet treatment liquid is a high viscosity liquid to prevent uneven coating of products. If only dip coating is applied, too much excess Geomet treatment liquid will adhere to the product, and bubbles may adhere due to bumping during baking, resulting in poor adhesion or thick adhesion in some areas. In order to prevent the occurrence of such geomet accumulation, after dipping, the process is performed in such a way that the remaining droplets are shaken off and baking is performed. After painting, baking is performed at a set furnace temperature and furnace time that can satisfy the Geomet baking conditions. Usually, the painting and baking process is repeated twice to create the finished product.

[Painting method]
Next, a method of painting the object to be treated 100 using the jig 1 will be described. As shown in FIG. 3, a jig in which several stages of ball studs, which are objects to be processed 100, are set in a Geomet processing liquid 300 is stacked in multiple stages. Next, as shown in FIG. 4, it is set in an elevating and rotating device 210, and immersed in a dipping tank 220 to apply liquid. The Geomet treatment liquid 300 is adjusted to a constant temperature within the range of 15°C to 30°C. In this embodiment, the Geomet treatment liquid 300 is set at about 20 degrees. Further, the immersion time in the immersion tank 220 is adjusted within the range of 1 second to 5 seconds. In this embodiment, the immersion time in the immersion tank 220 is about 2 seconds. Subsequently, after this liquid application step, the stacked jigs are placed in a shake-off tank 230, and the jig 1 is rotated to remove residual drops adhering to the workpiece 100 by centrifugal force. The rotation speed of the jig 1 in the shake-off tank 230 is about 100 to 300 rpm.
After removing the excess drops, it is placed in a furnace and baked at a temperature of about 320°C to 360°C. The basic process is 2 coats and 2 bakes, in which the process of painting once and baking once is repeated twice. The basic reason for using 2 coats and 2 bakes is that when painting and baking once, there are areas where the film thickness is thin due to uneven coating, so by making up for the thin areas, and by repeating the process twice, the unevenness of the required film thickness can be reduced. This is because it is possible to do so.

[Defects with old jig]
Next, the old jig that has been used conventionally will be explained. The old jig uses bolts to attach the product, and each time the product is produced, Geomet treatment liquid gets into the space between the bolt and nut, causing the bolt to spin poorly. As a result, problems such as bolts not turning and breaking during work may occur.
For this reason, it is necessary to replace old bolts and nuts every month, but since the bolts are stuck to the nuts, you need to cut them with force or use a disc grinder to remove the bolts that no longer turn. It was necessary to cut and replace it.

[Jig of this embodiment]
On the other hand, the jig 1 according to the present embodiment adopts a fixing method that does not use bolts and nuts like the old jig, and does not cause problems due to the fixation of the bolts and nuts due to the Geomet treatment liquid.

FIG. 5 shows the structure of the fixing part 20 for fixing the object 100 to be processed. The fixing part 20 has a fixing structure that does not use bolts and nuts. The object 100 to be processed is fixed by sandwiching the head 101 between two pins as a hook part included in the fixing part 20 and a patch plate as a plate part 21 serving as a reference for the attachment angle. A flat portion with a diameter of about 10 mm is provided at the end of the head 101. When fixing the workpiece 100, the direction of the workpiece 100 to be fixed can be aligned by applying the patch plate 21 to the flat end of the head 101 of the workpiece 100.

When the workpiece 100 is fixed horizontally and subjected to Geomet processing, it may be difficult to make the coverage uniform. For example, when the object to be processed 100 is mounted horizontally on a jig, the film thickness will be thicker in the lower part than in the upper part. From this, as shown in FIG. 1, the attachment angle of the workpiece 100 extends from the center of the head 101 to the center of the frame 10 so that the liquid accumulated on the end face of the shaft portion flows over the top when shaking off residual drops. The angle θ1 in the rotation direction with respect to the horizontal line is set in the range of 5° to 15°. Further, as shown in FIG. 2, the angle θ2 in the upward direction is set in the range of 0 to 7 degrees. Thereby, it is possible to reduce the deviation in the arrival time.

As shown in FIG. 5, the end surface of the shaft portion 102 of the workpiece 100 is not a flat surface but has a depression 105, which makes it difficult for residual droplets to be discharged during shaking off, and the residual droplets that are not discharged after shaking off drip downward. It was causing a buildup. This problem of residual dripping downward on the object 100 could also be solved by using the above-mentioned mounting angle.

In the process of fixing the ball stud 100, the ball stud 100 and the head 101 held horizontally are inserted from above so as to be sandwiched between the two pins 22 and the backing plate 21.

The two pins 22 are set so that when fixing the head 101, the interval between the upper parts (inner width) of the two pins 22 is larger than the interval between the lower parts. For this reason, the structure is such that the ball stud 100 can be easily pushed in from above and then sandwiched and fixed.

In the jig 1, the two hook parts 22 and the plate part 21 can be joined by welding in a molded state, so that a plurality of workpieces 100 can be held at equal intervals and at the same inclination. The jig 1 can be manufactured as follows. Thereby, it is possible to dip-coat a plurality of objects 100 stably and uniformly.

1 Jig 10 Frame 20 Fixing part 21 Plate part (backing plate)
22 Hook part (pin)
100 Object to be processed (ball stud)
101 Head (ball part)
102 Shaft part 103 Head end face 104 Shaft end face 105 Hollow 200 Coating device 210 Elevating and rotating device 220 Immersion tank 230 Shaking tank 300 Geomet treatment liquid

Claims (2)

In dip coating, a jig for fixing a workpiece having a substantially spherical head and a shaft extending from the head,
A frame formed in an annular shape when viewed from above,
a plurality of fixing parts fixed to the frame at predetermined intervals and to which the object to be processed can be detachably attached so that the shaft of the object to be processed is horizontal or the tip of the shaft is directed above horizontal; Equipped with
The fixing portion may include a plate portion that abuts near the apex of the head of the object to be processed, and a pair of hook portions that abut each side of a portion of the head to which the shaft portion is connected. A jig featuring: The jig according to claim 1, wherein the fixing part is capable of fixing the workpiece in a state where the shaft part is at an angle with respect to the diametrical direction of the frame.

Images