JPH08121946A - Refrigerator door - Google Patents

Abstract

PURPOSE: To provide a refrigerator door whose end piece is hard to see from the outer surface of the door body and which is small in the dimensional variation, extremely narrow in the gap between doors and excellent in appearance and design. CONSTITUTION: In a refrigerator door wherein its side face part is bent in such a manner that it assumes a nearly U-shaped cross section, its upper and lower parts are continuously formed extending over a front face plate 2a and a side face plate 2b, an end piece is attached by using a 5-20mm flange part 3 of an outer plate 2 and a foam heat insulating material is thereafter filled, the end piece is given a plate-like shape to hide only the flange surface. Along the line of the flange part 3 matching with a corner part 2d on the opposite side where the front face plate 2a and the side face plate 2b of the outer plate 2 join, the door plate is bent inwardly to form a bent part 3a by smoothly curving the surface consisting of one bent face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator door filled with a foamed heat insulating material, and more particularly to a refrigerator door having a door body formed by using end pieces.

[0002]

2. Description of the Related Art As a prior art of a heat insulating door of a refrigerator filled with a foamed heat insulating material, for example, one disclosed in Japanese Patent Application Laid-Open No. 2-85679 is known.

This conventional technique will be described with reference to FIGS. 15 and 16.

FIG. 15 is a vertical cross-sectional view of a conventional refrigerator heat insulating door, and FIG. 16 is a cross-sectional view taken along the line X--X of FIG. 16, and FIG. 16 is a perspective view showing the appearance of a conventional refrigerator heat insulating door.

In FIGS. 15 and 16, 31 is a heat insulating door,
32 is a door outer plate made of thin steel plate, 33 is a door inner plate, 33a
Is a plunger portion of the door inner plate 33, 34 is an end piece fitted in the door outer plate 32 from above and below, 34b is an engaging groove thereof, 34b is a rib, 35 is a foamed heat insulating material, and 36 is a gasket. . Reference numeral 37 denotes a pin receiver for pivoting the door to the refrigerator body with a hinge (not shown).

A door outer plate 32 having a rising portion 32a and a flange portion (not shown) on both sides of a thin steel plate,
The end piece 34 is engaged with the engaging groove 3 from the left or right or up and down direction (in this example, the up and down direction) where no
After being fitted through 4b and fixed to form a box body, the box body is filled with the foamed heat insulating material 35.

At this time, the engaging groove 34b of the end piece 34
The fitting direction of the door outer plate 33 is substantially parallel to the outer surface of the door body.

As another conventional technique, Japanese Patent Laid-Open No. 1-28 is known.
No. 5773 is cited, but in the publication described above, a substantially crank-shaped throttle step is provided at the end of the door outer plate where no flange is provided. The direction was almost parallel to the surface.

[0009]

The above-mentioned prior art has not considered the following points.

(1) Generally, the end pieces are made of synthetic resin, and the door outer plates are mostly made of thin steel plates.
In order to prevent rust and to secure a sufficient fitting margin to prevent the end piece from coming off during foaming, the end face is approximately 10 m
It is necessary to cover with an end piece of about m. Therefore, like the above-mentioned conventional example, the end piece is fitted and fixed to the door outer plate having the rising portion and the flange portion on both sides of the thin steel plate from the left or right or the vertical direction where the flange of the door outer plate is not formed. In the case of a structure with a door body, when the refrigerator is closed from the front and the refrigerator is viewed from the front, a mating margin of the synthetic resin end piece appears at the edge of the thin steel plate door surface, so the door surface has a glossy surface. Differences in level and steps were generated, which was not very desirable in terms of design.

Further, in the latter of the above-mentioned conventional examples, a crank-shaped diaphragm is provided on the door outer plate so that a step is unlikely to appear, but still the difference in gloss between the door outer plate and the end piece and the joint of both parts. There was a problem that lines were generated on the door surface.

(2) In the case of a refrigerator having a plurality of doors arranged side by side,
It is desirable in terms of design that the gaps between the doors are parallel and as narrow as possible in terms of expressing the sense of unity of the doors. However, in the door body in which the end pieces are arranged above and below the door outer plate as in the above-mentioned conventional technique, the direction in which the foaming pressure is applied when the foam heat insulating material is filled,
Since the fitting direction of the end piece and the door outer plate is the same direction, the end piece is pushed and moved by the foaming pressure, which causes variations in the fitting depth between the door outer plate and the upper and lower end pieces. As a result, the heights of the doors vary and the fitting of the end pieces occurs, making it difficult to keep the gaps between the doors parallel and as narrow as possible. Therefore, as a result, there has been a problem that the gap between the doors has to be large with a margin. Moreover, since the load applied to the door is entirely applied to the pin receiver 37 into which the hinge pin is inserted, the pin receiver 37 is sometimes displaced as shown in FIG.
Originally, the foamed heat insulating material 35 also has the purpose of regulating this movement, but as is well known, since the foamed heat insulating material itself has flexibility, it cannot be executed. It was very difficult.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The end piece is difficult to see from the outer surface of the door body, and the variation in door dimensions is small, and the gap between the doors is small. The objective is to provide a refrigerator door that is as narrow as possible and has an excellent appearance.

[0014]

[Means for Solving the Problems] The present invention has been made to achieve the above object.

That is, the side surface portion is bent so that the cross-sectional shape is substantially U-shaped, and the upper and lower portions have a door outer plate having a flange portion of 5 to 20 mm formed continuously over the front plate and the side surface plate. In a door in which an end piece is attached using the flange portion of the door and then the foam insulation material is filled, the end piece has a plate shape that hides only the flange surface, and the door outer plate The flange portion facing the continuous corners of the face plate and the side plate is bent inward with a smooth curved surface formed by one curved surface to form a bent portion.

Further, specifically, the door pivot pin receiver is located near a bent portion bent inward with a smooth curved surface consisting of one curved surface.

Further, the abutting portion of the end face of the side plate bent inward and the flange is covered with a cover portion provided on the end piece.

Furthermore, the door outer plate is made of a design steel plate having a surface of a sheet metal provided with added value in appearance such as painting or printing.

Still further, the door surface plate side of the end piece is located on the back side of the door surface.

[0020]

[Function] The flange to which the end piece is attached does not have unevenness at the corner so that the end piece and the flange are not joined together without a gap. The curved portion prevents generation of wrinkles and the like, and provides a flat surface having no unevenness.

As a result, a large gap is not generated between the end piece and the flange portion.

[0022]

【Example】

[Embodiment 1] Hereinafter, each embodiment of the present invention will be described with reference to FIGS.
Will be described with reference to.

FIG. 1 is a longitudinal sectional view of a heat insulating door for a refrigerator in which an end piece and a door outer plate according to an embodiment of the present invention are incorporated. A sectional view taken along the line AA of FIG. 2 and FIG. FIG. 3 is an external perspective view of a heat insulation door for a refrigerator incorporating an end piece and an outer plate according to an embodiment, and FIG. 3 is a heat insulation door for a refrigerator and a foam door incorporating an end piece and a door outer plate according to an embodiment of the present invention. FIG.

In FIGS. 1 and 2, 1 is a heat insulating door that closes the front of the refrigerator body, 2 is a door outer plate made of thin steel plate, and 3 is a door outer plate.
Is a flange portion formed in a substantially L shape in the depth direction (spanning the side surface plate 2b) from the front surface of the door body at the vertical end portion of the door outer plate 2, 4 is the door inner plate, and 5 is the door outer plate. An end piece attached to the flange portion 3 formed in 4. The end piece 5 is made of thin steel plate or synthetic resin. 6 is an engaging groove of the end piece into which the flange portion 3 of the door outer plate 2 is to be inserted, 7 is a rib of the end piece, 8
Is an iron plate for reinforcing the end piece, 9 is a foam insulating material, 10 is
Is a gasket, and 11 is a pin receiver for inserting a hinge pin.

The heat-insulating door 1 is composed of a door outer plate 2, a door inner plate 4, an end piece 5, a gasket 10, etc., and a space portion composed of these door outer plate 2, door inner plate 4, end piece 5, etc. And is filled with the foamed heat insulating material 9. At the time of manufacturing the door body, the end piece 5 connects the door outer plate and the flange portion 12 of the door inner plate 4.

That is, the door inner plate 4 side of the end piece 5 overlaps the flange portion 12 of the door inner plate 4, and the door outer plate 2 side of the end piece 5 is attached to the end face of the door outer plate 2. It is fitted by an engagement groove 6 formed so as to fit the formed flange portion 3.

The end piece 5 and the door outer plate 2 are fitted in substantially the same direction as the depth direction of the door body. By doing so, the foaming pressure applied to the end piece 5 at the time of filling the foamed heat insulating material 9 becomes a direction perpendicular to the fitting direction of the end piece 5 and the door outer plate 2, so that the end piece 5 and the door outer plate 2 are fitted together. The bubbling pressure is received by the flange portion 3 provided on the No. 2.

This point will be described below with reference to FIG.
When filling the foam insulating material 9, the door outer plate 2, the door inner plate 4,
In order to prevent the door body constituted by the end pieces 5 and the like from expanding due to the foaming pressure, the foam work 13 is used to tighten the door body. The number of foaming workers 13 is 10 to 30 for convenience of mass production. The height dimension H ₁ of each foam worker 13 has a certain degree of difference (maximum about 1 mm) due to dimensional tolerances. Therefore, when the fitting direction of the end piece 5 to the door outer plate 2 is the conventional fitting direction, the difference tends to be directly reflected in the height dimension H of the door body.

However, in this embodiment, since the flange portion 3 of the door outer plate 2 is fitted in the engaging groove 6 of the end piece 5, the movement thereof is suppressed by the rigidity of the flange portion 3. Further, the bulge of the end piece 5 itself is also suppressed by the ribs 7 and the reinforcing iron plate 8 on the back surface of the end piece. Therefore, the H size is determined by the size of the door outer plate 2 without being largely influenced by the size tolerance of the firing staff 8. As a result, a door with higher dimensional accuracy than before can be obtained. The depth dimension of the heat-insulating door 1 is smaller than the height dimension, so that variations in dimensional tolerances are reduced.

According to the present embodiment, the fitting margin between the end piece 5 and the door outer plate is provided in the depth direction of the door body, not on the outer surface of the door body, so that the door is closed and the refrigerator is viewed from the front. When seen, the end piece 5 becomes inconspicuous or invisible, which greatly contributes to the solution of problems in appearance design such as a difference in gloss and a step on the outside surface of the door.

Further, in the case of seeking a flat surface feeling of the refrigerator, since the end piece 5 and the door outer plate have a fitting margin on the upper and lower door plates, it is possible to reduce the unevenness of the side surface of the door. It is possible to obtain a more excellent refrigerator in terms of design.

Furthermore, since the width of the above-mentioned fitting margin can be set arbitrarily, it is possible to secure a sufficient overlapping distance between the end surface 5 of the door outer plate 2 and the end piece 5 necessary for rust prevention. is there. Further, since the variation in the door size is reduced, in the refrigerator in which a plurality of doors are arranged side by side, it is possible to minimize the gap between the doors, and it is possible to obtain a refrigerator door excellent in appearance design. It is a thing.

[Embodiment 2] FIG. 4 is a longitudinal sectional view of a heat insulating door for a refrigerator according to another embodiment of the present invention, which is equivalent to a sectional view taken along line AA of FIG.

The difference between this embodiment and the previous embodiment is the shape of the flange portion 3 of the door outer plate 2.

In FIG. 4, reference numeral 3 denotes a flange portion formed in an end portion of the door outer plate 2 in the vertical direction in a substantially L-shape in the depth direction from the front surface of the door body. The diaphragm step 14 having a depth equal to or greater than the above is provided.

That is, as shown in FIG. 4, a throttle step 14 having a substantially crank-like depth is provided at the end of the flange 3 provided on the door outer plate 2 made of a thin steel plate, and the end piece 5 is provided there. Are fitted together and fastened. Also in this case, the fitting direction is substantially perpendicular to the foaming pressure direction. In this case, the depth T ₂ (step) of the aperture step 14 is configured so that T ₁ ≦ T ₂ with respect to the wall thickness T ₁ at the end portion of the end piece. By doing so, when the refrigerator is viewed from the front, it looks as if the entire heat insulating door 1 is made of the door outer plate 2, so the design effect is doubled, and in particular,
It is also possible to make the upper and lower ridges of the heat insulating door 1 have a soft bending radius.

Next, the door outer plate 2 will be described with reference to FIG.

In the figure, the door outer plate 2 of the present invention is formed with a U-shaped cross-section at both ends, and is provided with a continuous flange portion 3 at the upper and lower ends over the front plate 2a and the side plate 2b.

The length of the flange portion 3 is 5 to 30 mm. 2a is a front plate. The bent portion 3 is formed on the flange portion 3 corresponding to the continuous corner portion 2d of the front plate 2a and the side plate 2b.
a is provided. As shown in FIG. 6, the bent portion 3d is a smooth curved surface formed of one curved surface and is formed inward of the flange portion 3. As a result, the flange length (corresponding to L) of the corner flange portion 3b is maintained at the same length as the other linear portion L dimension.

Further, how to make the bent portion 3a will be described with reference to FIGS.

Generally, an end portion in the direction perpendicular to the bending direction of a sheet metal part that has been L-shaped bent is folded back inward with respect to the entire bent portion to form a continuous flange surface on the straight side portion of the L-shaped portion and the corner portion. In the processing of sheet metal parts, the shape of the corner part after forming the flange surface must be smaller than that before forming, which results in shrinkage flange forming, resulting in excess thickness on the flange part of the corner portion after forming and wrinkling. Or illicit deformation due to buckling is inevitable. This is an expression (hπ / 2) in which the circumferential length of the inner radius portion after forming the flange surface at the corner portion is represented by the flange width h as compared with the circumferential length of the outer radius portion.
This is because the material becomes excessively short and the material becomes buckled.

In the conventional method, as shown in FIG. 7 (a), the corner of the corner portion is cut out in the bending radius direction to reduce the extra thickness generated when the flange surface is formed, and to form the flange surface of the corner portion. Alternatively, as shown in FIG. 7B, there is a method in which a flange surface is formed when a bending process is performed by providing a cutout shape in which the flange surface of the corner portion after molding is developed at the end portion of the corner portion.

Further, as shown in FIG. 7 (c), there is a method in which one or a large number of grooves are provided at the corners of the flange surface so as to absorb the excess thickness generated when the flange surface is formed.

However, in this method, as shown in FIG.
In (b), the cut surface of the material is formed in the vicinity of the front surface of the sheet metal part, and the cut surface has poor paintability and poor rust resistance, so that the corrosion of the front surface of the sheet metal part progresses quickly and the rust resistance as a part is high. There is a problem that Further, in FIG. 7 (c), the groove has a poor coatability and has a shape in which water easily accumulates, and therefore, there is a similar problem.

Particularly, in the case of a sheet metal part using a designed steel plate, the above-mentioned problems are further promoted because the product is not coated after molding and the cut surface remains as it is. In addition, when the design surface bends in the inner radius direction and a bending or buckling part with a small radius of curvature is generated, the design surface may have a phenomenon that the adhesion with the metal surface is deteriorated or peeling occurs near the end surface and rust prevention of the end surface part Sex deteriorates.

Therefore, in the general processing method of this kind, in the refrigerator door using the design steel plate, the structure is such that the flange surface of the corner portion is not formed, or the flange surface of the corner portion is notched or grooved. As a result, rust-preventive treatment was applied to the portion whose rust-preventive property was lowered. However, there is a problem that a rust preventive process is required, which restricts the design of the manufacturing structure and the appearance of the product, and thus increases the manufacturing cost.

The present invention provides a flange having no notches, cuts or locally bent portions on the flange surface of the corner portion, and the ridge line of the flange surface corner portion does not bulge over the entire bent portion. It is intended for.

Therefore, a smooth curved surface shape (bent portion 3a) formed by one curved surface that absorbs excess thickness generated at the time of forming the flange portion is provided at the corner of the flange portion at the corner portion of the flange portion where the contraction flange forming is performed. It is designed to be formed.

A method of making the bent portion 3a will be described below.

In FIG. 6, 16 indicates a corner portion.
Reference numeral 17 denotes a straight side portion, and at the end of the corner portion 16, a flange surface 16a having a corner apex portion with a flange width of h2 and a concave curved surface with respect to the bending center of the corner portion 16 toward the inside perpendicular to the flange surface. A certain smooth curved surface shape 16b is formed. The flange surface 16a has a shape in which the flange width increases toward both outer sides and is continuous with the flange surface 16a formed at the end of the straight side portion 6 represented by the width h1.

Curved surface shape 16b formed in the corner portion 16
Is continuous with the flange surface 16a of the corner portion 16 and the flange surface 16a of the straight side portion 17 by a connecting surface 16c which is a curved surface having a radius of curvature that is three times or more the plate thickness t of the material. Therefore, the L-shaped corner C has a straight portion 1
7 is a flange surface 16a and the corner portion 16 is a flange surface 1
6a, a curved surface shape 16b, and a connecting surface 16c are formed on the surface of the base plate to form a cut surface or a flange surface without local bending. The length h3 of the curved surface shape 16b inward in the direction perpendicular to the flange surface is the maximum at the position of the apex of the corner portion and gradually decreases toward both outer sides.

In the method of the present invention, the curved surface shape 16b is provided on the flange surface 16a at the end of the corner portion 16 to reduce the extra thickness at the time of forming the shrink flange when forming the flange surface at the end of the corner portion 16. The curved surface shape 16b can be absorbed. Further, by forming the flange surface by a smooth curved surface consisting of a flat surface and one curved surface, it is possible to improve the uniformity of the coating film on the flange surface 16a of the bent portion 3a when coating is performed, and to prevent water from accumulating. Because of the shape, it is possible to improve the rustproof property of the corner flange surface 16a. Particularly, in the case of a door outer plate using a design steel plate as a base plate, the design surface with good adhesion to the base plate is continuous up to the tip of the curved surface shape 16b. It becomes a bent molded product with a flange that has better rust resistance than the molded product.

Next, the method and apparatus for forming the flanged corner portion shown in FIG. 6 will be described with reference to the drawings. FIG. 8 is a perspective view showing a mold device for molding a flanged corner portion C of a door outer plate 2 according to an embodiment of the method of the present invention and a flanged corner portion C machined by the die device. . FIG. 9 shows the center line C- in FIG.
16 is a cross-sectional view taken along line C-D-D, and FIG. 16 is a perspective view of FIG. 8 viewed from the opposite direction.

In the figure, 18 is an upper die punch and 19 is a lower die. Reference numeral 20 denotes a corner component bent at a predetermined bending radius R and an opening angle θ, and is a flange width h1 formed by being restrained by the lower die 19 and the holding jig 21.
It has a flange surface forming portion 20a that is just protruding. The upper die punch 18 has an eight-shaped notch portion 18a whose lower portion has an opening angle of an angle θ2, and the shape of the center portion of the notch portion 18a is an arc represented by a radius R2. The notch portion 18a is formed with a chamfered portion 18c that is inclined at an angle δ with respect to the processing surface 18b on the side where flange bending is performed and has a depth d in the vertical downward direction with respect to the processing surface 18b.
It is designed with a relationship of h1 / d so that the chamfered portion 18c comes into contact with the bent component 20 when the is lowered. Processed surface 18b
The chamfered portion 18c and the chamfered portion 18c are chamfered in an arc shape so that galling of the material surface does not occur during flange bending. A recess 22 is formed in the die 19,
The curved surface shape 16 b in FIG. 6 when the flange bending is performed is formed in the recess 22. The flange width h2 of the flange surface 16a of the corner is determined by the length I from the upper end of the die 19 to the recess 22.

The flange width h1 of the shape die device and the flange bending molded product, the circular arc R at the center of the notch of the punch 18
2, the chamfering angle δ, and the length I from the tip of the die 19 to the recess are defined under the following conditions so that the present molding method can achieve good molding. h1 is set to be within 0.8 times the bending radius R of the corner portion. R2 is set to a size equal to or larger than the bending radius R of the corner portion. I is set within 0.4 times the bending radius R of the corner portion. δ is set to 30 ° to 60 °.

For forming, the center of the arc of the notch portion 18a of the punch 18 and the center of the arc of the die 19 are aligned with each other as shown in FIGS.
In this state, a clearance corresponding to the plate thickness is provided and the punch is lowered vertically downward. FIG. 11 (a)
~ (C) is a corner part 2 in which flange bending is performed.
It shows the bending forming process of 0. As the punch 18 is lowered, the arc R2 of the cutout portion 18a becomes equal to or larger than the bending radius R of the corner portion, so that the chamfered portion 18c of the tip of the corner portion apex of the flange surface forming portion 20a of the corner part 20 is formed. Get in touch. As the punch 18 descends, the bending progresses with the contact portions gradually expanding to both outsides.
At this time, the tip portion of the flange surface forming portion 20a has a shape that is wound inside. FIG. 11A shows the shape of the flange surface forming portion 20a in a state where the punch 18 is lowered until just before the chamfered portion 18c contacts the portion of the flange surface forming portion 20a where the flange surface 17a of the straight side portion is formed. It is the represented figure. Since the punch 18 is not in contact with the straight side portion, bending is not performed, and the corner portion is bent to have a shape in which the tip is wound inward.

The punch 18 is further removed from the state shown in FIG.
When is lowered, the flange surface 17a of the straight side portion is bent down in the same manner as the leading end of the corner portion of the flange surface forming portion 20a and the peripheral portion thereof are rolled up. Flange surface 1
Since the excess thickness of the flange surface forming portion is gathered toward the corner due to the bending of 7a, as shown in FIG.
As shown in FIG. 11B, the curved surface of FIG. 11A is a curved surface shape that spreads over the entire corner portion, and is formed in a direction substantially perpendicular to the flange surface 17a of the straight side portion.

The punch 18 is further removed from the state shown in FIG. 11 (b).
11B, the bending of the entire flange surface forming portion 20a proceeds, and the curved surface formed in FIG.
The inner wall portion 22a inside the recess 22
FIG. 11 shows the shape of the inner wall 22a formed by the contact.
The curved surface shape shown in FIG.

When the punch 18 is further lowered and the processing surface 18b of the punch 18 contacts all of the flange forming portion 20a, the flange bending is completed, and the flanged corner portion shown in FIG. 16 is obtained.

According to the present molding method, it is possible to bend and form the excess thickness generated during the shrinking flange molding while forming a smooth curved surface shape, and it is possible to mold the corner flange portion into a smooth curved surface shape. In particular, in the case of forming a design steel sheet, it is possible to bend the flange of the corner portion without defects such as scratches and peeling on the flange surface.

Various dimensions of the door component in this embodiment are as follows. Regarding sheet metal part 1, height H * width W * depth D = 400 * 600 * 50 mm, blank pre-coated steel sheet, plate thickness 0.5 mm, corner radius R15 mm, opening angle θ1 = 90 degrees, flange width h1 = 8 mm, Corner flange width h2 = 3.5 mm, curved surface depth h3 = 4.5
mm, the radius of curvature of the connecting surface 5c is 2 mm. Regarding the die device, the opening angle θ2 of the punch 18 = 90 degrees, the radius R2 of the arc of the central portion R2 = 20 mm, δ = 45 degrees, d = 10 m.
m, 1 = 2.5 mm, groove 11φ12.5 mm, depth 6 m
m.

In this embodiment, a concave punch is used in the lower part of the punch, but the present invention does not limit the shape of the punch, and when the punch is lowered, the flange of the corner portion is initially formed. Any punch shape is acceptable as long as the punch comes into contact with the tip apex portion of the corner portion of the surface forming portion 20a and the bending process can be performed while the flange portion of the corner portion is curved. Therefore, even a punch having a combination of concave and convex shapes shown in FIG. 12A or a punch having a flat center as shown in FIG. 12B can be bent and formed by the method of the present invention.

Next, the pin receiving portion will be described with reference to FIG.

In the figure, 1 is a heat insulating door. Although not shown in the figure, the door 1 is attached to a hinge portion attached to the refrigerator main body side. Reference numeral 11 is a pin receiver into which the pin of the hinge is inserted. 2 is a door outer plate, 4 is a door inner plate, and 9 is a foam insulation material.

The pin receiver 11 in the present invention is fixed by the foamed heat insulating material 9 as in the conventional case. However, in the present invention, the bent portion 3a is located near the pin receiver 11. Therefore, the movement allowance of the foamed heat insulating material filled between the bent portion 3a and the pin receiver 11 is much smaller than in the conventional case. That is, in the conventional structure, the thickness of the foam insulating material is W ₁ , but in the present invention, it is about 1/2 W ₁ =
This is because it becomes W ₂ .

Next, with reference to FIG. 14, a method of processing the side plate 2b whose side surface is bent into a substantially U-shape and the abutting portion H of the flange portion 3 will be described.

As is clear from the figure, the abutting portion H
A gap Q is generated in the gap Q. In the present invention, a cover portion 5a is provided as shown in FIG. 2 in order to process the gap Q portion to improve the touch resistance and maintain the appearance. .

[0068]

As described above in detail, according to the present invention, the end piece is hard to see from the outer surface of the door body, and
It is possible to provide a refrigerator door which has a small variation in door dimensions and a gap between doors that is as narrow as possible, and which has an excellent external appearance.

Rust-proof because the flange surface forming part can form a continuous bent surface at the end without local bent corners or cut surfaces and notch shape, and the shape of the flange part is good and the water does not easily accumulate The property is improved. Further, when a stress is applied to the bending portion, the bending portion has a high rigidity to disperse the stress on the entire smooth curved surface.

Further, since the ridgeline of the corner portion of the flange surface does not bulge with respect to the entire bent portion, there is no gap between the end piece and the outer panel of the door, and the product has an excellent appearance.

Further, since the corner portion has a smooth curved surface shape, it is possible to easily form secondary processing such as expanding a hole in this portion.

Particularly in a sheet metal part using a design steel plate, the length from the end face portion to the outer radius portion can be made larger than before without damaging the design face on the flange surface of the corner portion, so that the progress of rust on the end face portion On the other hand, it takes a long time to reach the product appearance and the product life is extended. It is possible to perform molding without damaging the design surface even when performing secondary processing such as burring processing, and the degree of freedom in product design is improved.

[Brief description of drawings]

1 is a vertical cross-sectional view of a heat insulating door for a refrigerator in which an end piece and a door outer plate according to an embodiment of the present invention are incorporated;
FIG.

FIG. 2 is an external perspective view of a heat insulating door for a refrigerator incorporating an end piece and an outer plate according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a heat insulating door for a refrigerator and a foaming work incorporating an end piece and a door outer plate according to an embodiment of the present invention.

FIG. 4 is a view showing an embodiment different from FIG. 1 and is taken along line A- of FIG.
FIG.

FIG. 5 is an external perspective view of a door outer plate according to the present invention.

FIG. 6 is a detailed explanatory diagram of an F portion in FIG.

FIG. 7 is a diagram showing a general processing structure of FIG. 6;

FIG. 8 is a view showing a molding die device that constitutes the bent portion 3a of the present invention.

9 is a sectional view taken along line CC and DD of the molding die device of FIG.

FIG. 10 is a sketch of the molding die device of FIG. 8 viewed from the opposite direction.

11 is a view showing a forming process of flange bending forming by the forming die apparatus of FIG.

FIG. 12 is a view showing the shape of a punch according to another embodiment of the present invention.

13 is a detailed view of a pin receiving portion provided with the present invention and is a sectional view taken along line F-F of FIG. 2. FIG.

FIG. 14 is a view of FIG. 5 viewed from the P direction.

FIG. 15 is a sectional view of a main part of a conventional refrigerator door (X- in FIG. 16).
It is an X sectional view).

FIG. 16 is an external view of a conventional refrigerator door.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat-insulating door, 2 ... Door outer plate, 2a ... Front plate, 2b ... Side plate, 2d ... Corner part, 3 ... Flange part, 3a ... Bent part, 3b ... Corner flange part, 4 ... Door inner plate, 5 ... end piece, 5a ... cover part, 6 ... engaging groove, 7 ... rib (end piece), 8 ... end plate reinforcing iron plate, 9 ... foam insulation, 10 ... gasket, 11 ... pin receiver, 12 ... door Flange portion of inner plate 4, 13 ... Foaming work, 14 ... Drawing step, 16 ... Corner portion, 16a ... Flange surface, 16b ... Curved shape, 16c ... Connecting surface, 17 ... Straight surface, 17a ... Straight surface flange Surface, 18 ... Upper punch, 18a ... Notch, 18b ... Machining surface, 18c ... Chamfer, 19 ... Lower die, 20 ... Corner parts (corner flange 3b of door outer plate 2)
Equivalent product), 20a ... Flange surface forming portion, 21 ... Holding jig, 22 ... Recessed portion, 22a ... Inner wall portion.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor, Teruji Suzuki 800, Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Stock company Hitachi Co., Ltd.

Claims (5)

[Claims] 1. A door outside having a flange portion of 5 to 20 mm formed by bending the side surface portion so that its cross-sectional shape is substantially U-shaped, and forming the upper and lower portions continuously over the front plate and the side surface plate. In a door in which an end piece is attached by using the flange portion of the plate and then the foam insulation material is filled, the end piece is a plate-like member that hides only the flange surface, and the door outer plate A refrigerator door, characterized in that a flange portion facing a continuous corner portion of a front plate and a side plate is bent inward with a smooth curved surface formed by one curved surface to form a bent portion. 2. The door of the refrigerator according to claim 1, wherein the door pivot pin receiver is located in the vicinity of a bent portion that is bent inward with a smooth curved surface consisting of one curved surface. 3. The refrigerator door according to claim 1, wherein the end portion of the side plate bent inward and the abutting portion of the flange are covered with a cover portion provided on the end piece. 4. The door of the refrigerator according to claim 1, wherein a design steel plate having a surface of a sheet metal provided with added value in appearance such as painting or printing is used as the door outer plate. 5. The door of the refrigerator according to claim 1, wherein the door surface plate side of the end piece is on the back side of the door surface.