JPS5919268B2 - Refrigerator manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerator in which a flange of an inner box is press-fitted into a flange provided on a metal outer box.

When painting the outer box of this kind of refrigerator, the outer boxes are lined up on a conveyor and placed one after another into a painting room.In the painting room, an electric field is applied between the outer box and the sprayer, and the powder is sprayed from the sprayer. A series of painting processes in which the paint is blown off and adhered to the outer box using static electricity, and the outer box with the powder paint adhered to it is heated in a heating furnace to melt the powder paint and bake it into close contact with the outer box. I try to do everything automatically.

When the outer box of a relatively large refrigerator is painted in a paint room using this automated process, the powder paint sprayed from the sprayer uniformly adheres to a wide area around the outer box. controlled to do so.

However, in conventional refrigerators, the shape of the flange formed at the opening edge of the outer box is extremely narrow at the time of painting, with the width of the opening being 1 to 3 mm, and the width gradually increases beyond the opening. The cross section is approximately U-shaped.

For this reason, the powder paint sprayed from the sprayer uniformly over a wide area around the outer box has a narrow opening width (it is difficult to reach the inner surface of the flange, and therefore there is not enough space on the inner surface of the flange). It was difficult to apply a coating and had the disadvantage of poor corrosion resistance.

The present invention has been made in view of the above circumstances, and its purpose is to provide a refrigerator with excellent corrosion resistance.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is an outer box made of metal, for example, a steel plate, 2 and 3 are inner boxes, for example, made of plastic, which form a freezer compartment 4 and a refrigerator compartment 5, and 6 is a combination of outer box 1 and inner boxes 2 and 3. It is a foam insulation material filled in between.

Openings 7 and 8 facing the freezing compartment 4 and the refrigerating compartment 5 are formed in the front plate 1□ of the outer box 1, respectively, and a flange 9 having a substantially U-shaped cross section is integrally formed at the edge of each opening. A flange 10, which is integrally formed on the opening edge of each of the inner boxes 2 and 3, is press-fitted into the flange 9.

Now, regarding the process of forming the flange 9, Fig. 2a-
This will be explained with reference to c.

First, as shown in FIG. 2a, the width dO of the opening of the flange 9 is made wide, and in this state the entire outer box 1 and the inner surface of the flange 9 are painted.

Next, the flange 9 is caulked using a caulking machine, which will be described later, to narrow the width d1 of the opening of the flange 9 (1 to 2 rran) as shown in FIG.

That is, the openings 7 and 8 are formed so that the vicinity of the corners is approximately 2 rran, and the central portion between each corner is approximately 1 rran.

In this case, as shown in FIG. 3, since the flange 9 is formed with slits 9a at predetermined intervals, it is easy to partially vary the width of the opening of the flange 9.

After that, as shown in FIG. 2C, each flange 1 of the inner box 2 and 3 is
0 is press-fitted into the flange 9, and a foamable heat insulating material 6 is filled between the outer box 1 and the inner boxes 2 and 3, and is foamed and solidified.

Now, the crimping machine will be explained with reference to Fig. 4.
Reference numeral 11 denotes a main body, and a presser plate 14 is provided at the base end of an arm portion 13 rotatably supported on the main body via a pin 12.

15 is a passive plate fixed to the tip of the arm 13; 16 is an air cylinder fixed to the main body 11; and 17 is a moving table moved by the piston rod 18 of the air cylinder 16.

19 is a push rod provided on the moving table 17, and the air cylinder 1
6 extends, the push rod 19 pushes the passive plate 15 and the arm part 13
is designed to rotate in the direction of the arrow.

Reference numeral 20 denotes a receiving part formed on the lower surface of the main body 11 so as to face the holding plate 14, and a step part 21 is provided near this receiving part.

Now, as shown in Figure 2a, the width of the opening of the flange 9 is d.

After the outer box 1 is painted, the opening 7 is inserted into the crimping machine.
and 8 are placed in contact with the stepped portion 21, and as the arm portion 13 is rotated in the force direction indicated by the arrow, the tip of the flange 9 is brought into contact with the receiving portion 20 by the holding plate 14. As shown in Figure 2, the flange 9 is crimped until the flange 9
The width of the opening is d.

In this way, according to this embodiment, painting is performed with the width of the opening of the flange 9 wide, and then the width of the flange 9 is narrowed by caulking.
The inner surface of the flange 9 can be sufficiently coated, resulting in extremely excellent corrosion resistance.

In addition, conventionally, a sealing material was fitted between the flange of the outer box and the flange of the inner box to improve the coating on the inner surface of the flange. If the width of the opening of the flange is narrowed by caulking after painting, there will be no need for a sealant, and the cost of the refrigerator will be lower overall.

As explained above, in the present invention, since the inner surface of the flange is painted with the width of the opening of the flange being wide, the inner surface of the flange can be sufficiently coated and has excellent corrosion resistance. Becomes excellent.

First, since the flange is caulked after painting and press-fitted into the flange of the inner box, there is no need for sealing material, etc., and the manufacturing cost of the refrigerator is reduced overall.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic vertical sectional view, FIGS. 2 a - e are enlarged vertical sectional views of the main parts showing the manufacturing process, and FIG. 3 is the main parts FIG. 2 is a perspective view showing the state of the crimping machine, and FIG. 4 is a schematic side view of the crimping machine. In the drawings, 1 is an outer box, 2 and 3 are inner boxes, 7 and 8 are openings, 9 is a flange, 10 is a flange, 14 is a holding plate, and 20 is a receiving part.

Claims (1)

[Claims] 1. In a refrigerator in which a flange having a substantially U-shaped cross section is provided at the opening edge of a metal outer box, and a flange formed at the front opening of the inner box is fitted into the flange, the opening of the flange is made wider. The inner surface of the flange is painted in the formed state, and then the width of the opening of the flange is caulked into the middle so that the flange of the inner box can be press-fitted therein. A method for manufacturing a refrigerator.