492895 A7 一 B7 五、發明說明（1 ) 〔發明所屬·之技術領域〕 本發明，係關於將事先被噴漆的鋼板（噴漆鋼板）加 工，例如適合製作冰箱外殻時的噴漆鋼板之加工方法。 〔習知技藝） 在製作冰箱的外殼時，採用將把噴漆鋼板〔P CM ( 稱爲事先噴漆金屬）〕裁成所定形狀，並且予以彎曲加工 ，而製作外殼之方法。根據此方法時，將外殻製作後，因 能省略把其外殼噴漆之工程，故能提高冰箱之製造性。 〔發明所要解決之課題〕 可是，將噴漆鋼板彎曲加工時，特別係，進行在噴漆 鋼板的端部形成相當於外殼之凸緣部的部份之彎曲加工（ 把該彎曲加工稱爲冷軋成型）時，有時其被彎曲加工部份 的塗膜會劣化。具體上，有時會在噴漆鋼板的上述凸緣部 之塗膜，由彎曲加工時的殘留應力而產生微細裂痕，具有 水份將浸入該微細裂痕之虞。 此時，因將成爲噴漆鋼板的底.子之鋼板爲鋅鋼板，即 使水份侵入塗膜的微細裂痕，鋼板也不會生銹。對此，近 年來，爲了降低外殼之製造成本，做爲噴漆鋼板的底子鋼 板，已被檢討使用冷軋鋼板（SPCC)。然後，把冷軋 鋼板做爲噴漆鋼板之底子鋼板時，如果水份侵入上述由彎 曲加工而在塗膜產生的微細裂痕時，具有鋼板將會生銹之 虞，因此，無法把冷軋鋼板做爲噴漆鋼板之底子鋼板使用 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） · 4 - (請先閱讀背面之注意事項再If寫本頁)492895 A7 A B7 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to the processing of a steel plate (painted steel plate) that has been painted in advance, for example, a method for processing a painted steel plate suitable for making a refrigerator casing. [Know-how] When manufacturing the outer shell of a refrigerator, the method is to cut the painted steel plate [P CM (referred to as pre-painted metal)] into a predetermined shape and bend it to make the outer shell. According to this method, after the casing is manufactured, the process of painting the casing can be omitted, thereby improving the manufacturability of the refrigerator. [Problems to be Solved by the Invention] However, when the painted steel sheet is bent, particularly, a bending process is performed at the end of the painted steel sheet to form a portion corresponding to the flange portion of the casing (this bending process is called cold rolling forming). ), The coating film of the part to be bent may be deteriorated. Specifically, there may be a case where a fine crack is generated in the coating film of the flange portion of the painted steel plate due to residual stress during bending, and there is a possibility that moisture may enter the fine crack. At this time, since the steel plate that will become the bottom of the painted steel plate is a zinc steel plate, even if water penetrates into the fine cracks of the coating film, the steel plate will not rust. In response, in recent years, in order to reduce the manufacturing cost of the shell, as the base steel plate of the painted steel plate, the use of cold rolled steel plate (SPCC) has been reviewed. Then, when the cold-rolled steel sheet is used as the base steel sheet of the spray-painted steel sheet, if moisture penetrates into the above-mentioned micro-cracks caused by the bending process in the coating film, the steel sheet may rust, so the cold-rolled steel sheet cannot be made For the base plate of painted steel plate, the paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) · 4-(Please read the precautions on the back before writing this page)
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經濟部智慧財產局員工消費合作社印製 492895 A7 ______ B7 五、發明說明（2 ) 0 本發明之目的，係在提供在將噴漆鋼板彎曲加工時， 能夠防止被彎曲加工部份的塗膜劣化的噴漆鋼板之加工方 法。 〔爲了解決課題之方法〕 、 本發明的噴漆鋼板之加工方法，其特徵爲，具備將噴 漆鋼板彎曲加工的彎曲加工工程，和把噴漆鋼板之中至少 被彎曲加工的部份加熱.之加熱工程。 根據上述方法時，將噴漆鋼板彎曲加工時，即使在被 彎曲加工部份的塗膜發生殘留應力，也將實施加熱工程把 噴漆鋼板中至少被彎曲加工之部份加熱，故能使上述殘留 應力消滅。據此，能夠防止將噴漆鋼板彎曲加工時之被彎 曲加工部份的塗膜之劣化。 經濟部智慧財產局員工消費合作社印製 並且，在前述加熱工程，以構成將被彎曲加工的噴漆 鋼板被全體投入爐中加熱爲理想。更且，在前述加熱工程 ，把前述噴漆鋼板中被彎曲加工的部份，構成以高頻加熱 裝置加熱也可以。而且\在前述加熱工程，把前述噴漆鋼 板中被彎曲加工之部份，構成由紅外線加熱器加熱，將更 爲理想。 一方面，在前述加熱工程，構成把熱風噴在前述噴漆 鋼板中的被彎曲加工部份，使該部份加熱也是理想之構成 。而且，在前述加熱工程，把熱水淋在前述噴漆鋼板中的 被彎曲加工部份，構成予以加熱也是理想之構成。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐)~ - 5 · 492895 A7 經濟部智慧財產局員工消費合作社印製 __B7_五、發明說明（3 ) 更且，備有由將前述噴漆鋼板彎曲加工而製造冰箱外 殻的工程，和在前述外殻與內箱之間將尿烷泡沬發泡充塡 ，而形成絕熱箱體的工程，在爲了把前述尿烷泡沬發泡充 塡而將前述外箱預熱時，構成同時實施前述加熱工程爲更 理想之構成，。 而且，由於在以冷軋鋼板爲底子的鋼板，將塗膜塗層 而構成前述噴漆鋼板爲理想之構成。更且，在以鋅鋼板爲 底子的鋼板，由將塗膜塗層而構成前述噴漆鋼板，亦爲理 想之構成。 〔發明之實施例〕 以下，一面參照第1圖至第3圖，說明將本發明適用 在製作冰箱外殻的方法之第1實施例。首先，第2圖係顯 示本實施例的製作冰箱外殼之製造工程圖。如第2圖（a )所示，首先將準備噴漆鋼板1。該噴漆鋼板1，係在以 例如冷軋鋼板（亦即，S P C C )做爲底子的鋼板，把塗 膜塗層（亦即，P CM噴漆）而成之鋼板。本實施例的情 況，例如係使用聚酯系統之塗料。 然後，如第2圖（b )所示，進行把噴漆鋼板1的外 周部裁成所定形狀，式沖所定的孔等之工程。接著，如第 2圖（c )所示，由將噴漆鋼板1的圖中上下端部彎曲加 工（把該彎曲加工稱爲冷軋成型，亦即C RT成型加工） ，而在噴漆鋼板1之上下端部，形成相當於外殻的凸緣部 之部份2。更且，如第2圖（d)所示，由將噴漆鋼板1 請 先 閲 讀 背 面 意 事 項Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 492895 A7 ______ B7 V. Description of the invention (2) 0 The purpose of the present invention is to provide a coating film that can prevent the coating film of the bent part from deteriorating when the painted steel plate is bent. Processing method of painted steel plate. [Methods for solving the problem] The method for processing a painted steel sheet according to the present invention includes a bending process for bending the painted steel sheet, and a heating process for heating at least a part of the painted steel sheet that is bent. . According to the above method, when the spray-painted steel sheet is bent, even if the residual stress occurs in the coating film of the bent part, a heating process will be performed to heat at least the part of the spray-painted steel sheet that is bent, so that the residual stress can be made. wipe out. According to this, it is possible to prevent deterioration of the coating film of the portion to be bent when the painted steel plate is bent. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. In the aforementioned heating process, it is desirable that the painted steel plates that are to be bent are put into the furnace and heated. Furthermore, in the aforementioned heating process, it is also possible to configure the portion of the spray-painted steel sheet which is bent to be heated by a high-frequency heating device. Moreover, in the aforementioned heating project, it will be more desirable to heat the part of the spray-painted steel plate that is bent and heated by the infrared heater. On the one hand, in the aforementioned heating process, a bent part in which hot air is sprayed on the aforementioned painted steel sheet is constituted, and it is also an ideal composition to heat the part. In addition, in the aforementioned heating process, hot water is sprayed on the bent portion of the painted steel sheet, and the structure is also ideal for heating. This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ~-5 · 492895 A7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs __B7_ V. Description of the invention (3) Furthermore, there are The process of manufacturing a refrigerator casing by bending the spray-painted steel sheet, and the process of foaming and filling urethane foam between the outer casing and the inner box to form a thermal insulation box, in order to foam the urethane When pre-heating the outer case by foaming and filling with pre-foam, it is a more desirable structure to perform the heating process at the same time. In addition, since the steel sheet having a cold-rolled steel sheet as a substrate is coated with a coating film to constitute the aforementioned spray-painted steel sheet, it is an ideal configuration. Furthermore, a steel plate having a zinc steel plate as a substrate is also ideally constituted by coating the coating film to form the aforementioned painted steel plate. [Embodiment of Invention] Hereinafter, a first embodiment of a method for applying the present invention to a refrigerator case will be described with reference to Figs. 1 to 3. First, FIG. 2 is a manufacturing process drawing showing the manufacturing of the refrigerator casing of this embodiment. As shown in FIG. 2 (a), first, the steel plate 1 to be painted will be prepared. The painted steel sheet 1 is a steel sheet made of, for example, a cold rolled steel sheet (i.e., SPCC) as a substrate and a coating film coating (i.e., PCM spray-painted). In this embodiment, for example, a coating using a polyester system is used. Then, as shown in Fig. 2 (b), the outer peripheral portion of the painted steel sheet 1 is cut into a predetermined shape, and a predetermined hole is punched. Next, as shown in FIG. 2 (c), the upper and lower ends of the painted steel sheet 1 are bent (referred to as cold rolling forming, that is, CRT forming processing), and The upper and lower end portions form a portion 2 corresponding to the flange portion of the casing. Furthermore, as shown in Fig. 2 (d), the painted steel sheet 1 should be read through the backside items first.
Η 頁I I I I I I訂 λ 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 6 492895 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（4 ) 實行U彎曲等之彎曲加工，而製作外殻3。此時，第2圖 (c )及（d )所示的工程，將相當於本發明之彎曲加工 工程。 此後，進行將噴漆鋼板1之中，上述被彎曲加工部份 加熱的加熱;r程。本實施例之情況，例如把上述被彎曲加 工的噴漆鋼板1 (亦即，外殼3)全體收容在爐中，把爐 之庫內溫度設定成例如1 0 0 °C，構成例如加熱3 0分鐘 (亦即，退火）。 然後，如箅2圖（e )所示，將上述外殼3和內箱4 組合，把尿烷泡沬發泡充塡在兩者間，並且安裝隔壁5等 ，而製造冰箱的絕熱箱體6。更且，如第2圖（f )所示 ，由於在上述絕熱箱6·安裝壓縮機和冷卻器及冷凝器等 的冷凍循環，風扇裝置和察覺器及控制電路等電裝品，以 及，把冷藏室和冷凍室.等之各開口部開閉的門安裝，而構 成冰箱7的製品之完成裝配。 在此，關於本實施例的冰箱7之外殼3的製造工程， 簡單地表現時，將成爲如第1圖（a )所示的製造工程之 流程。亦即i本實施例的製造工程，備有在冷軋鋼板（S PC C )實施P CM噴漆之工程，和把噴漆鋼板1彎曲’加 工的C R F成形工程，及把彎曲加工之噴漆鋼板1加熱的 退火加溫工程。再者，已往構成的冰箱之外殼的製造工程 係如第1圖（b )所示地使用鏡鋼板，備有對該鋅鋼板進 行P CM噴漆的工程，和把噴漆鋼板彎曲加工之CRF成 形工程。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公if)"""" -7-III Page IIIIII Order λ This paper size is applicable to Chinese National Standard (CNS) A4 (210 X 297 mm) 6 492895 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (4) Implementation of U-bend etc. Bending is performed to make the case 3. At this time, the processes shown in Figs. 2 (c) and (d) will correspond to the bending process of the present invention. Thereafter, heating is performed in the spray-painted steel sheet 1 by heating the above-mentioned bent portion. In the case of this embodiment, for example, the entire spray-painted steel plate 1 (that is, the casing 3) that is bent is housed in a furnace, and the temperature in the furnace is set to, for example, 100 ° C, and the structure is heated for 30 minutes, for example. (Ie, annealing). Then, as shown in Fig. 2 (e), the outer case 3 and the inner case 4 are combined, the urethane foam is foamed and filled between them, and a partition wall 5 is installed to manufacture a heat-insulating box 6 of the refrigerator. . Furthermore, as shown in FIG. 2 (f), since the refrigerating cycle such as a compressor, a cooler, and a condenser is installed in the adiabatic box 6, electrical components such as a fan device, a sensor, and a control circuit are installed, and Doors that open and close the openings of the refrigerator compartment, the freezer compartment, etc. are installed to complete the assembly of the products constituting the refrigerator 7. Here, when the manufacturing process of the casing 3 of the refrigerator 7 of this embodiment is simply expressed, it will be a manufacturing process flow as shown in FIG. 1 (a). That is, the manufacturing process of this embodiment includes a process of performing P CM painting on a cold-rolled steel plate (S PC C), a CRF forming process of bending and painting the painted steel plate 1, and heating the curved painted steel plate 1. Annealing heating works. In addition, the manufacturing process of the outer casing of the conventional refrigerator uses a mirror steel plate as shown in FIG. 1 (b), and includes a process of painting the zinc steel plate with P CM, and a CRF forming process of bending the painted steel plate. . This paper size applies to China National Standard (CNS) A4 (210 X 297 male if) " " " " -7-
492895 A7 B7 五、發明說明（5 ) 接著，說朋本實施例的作用，亦即，關於由增加上述 退火加溫工程之作用予以說明·。首先，將噴漆鋼板1彎曲 加工時，如第3圖所示，在被彎曲加工的彎曲加工部2 a ，2 b之表面塗膜留有殘留應力，由於加上淸潔劑等將產 生微細裂痕/再者，是否已產生該微細裂痕，能夠由如下 的鹽水噴霧測試而判定。該鹽水噴霧測試，係將上述彎曲 加工部2 a，2 b的表面，以甲醇例如擦拭3 0次（所謂 甲醇磨擦）後，把鹽水噴霧（進行鹽水噴霧測試），其後 ，例如在3 0 0小時後，判定是否生銹之測試。在該測試 ，由於生銹而能得知在彎曲加工2 a，2 b的表面之塗膜 ，有發生微細裂痕。 再者，已經由實驗得知，如果未實施上述3 0次的甲 醇磨擦，即使進行鹽水噴霧測試，也將不會生銹。亦即， 可能上述甲醇，將引起發生微細裂痕或塗膜之溶脹，造成 促進水份向塗膜內的侵入。然後，在冰箱之實際使用環境 ，係由使用者被進行使用酒精系統的淸潔劑擦拭，將該淸 潔作業以上述甲醇擦拭再現。 那麼，上述彎曲加工工程之後，進行退火加溫工程（ 加熱工程），把噴漆鋼板1中的被彎曲加工部份加熱時， 能夠消除上述殘留應力。實際地，對上述實施退火加熱工 程者，實施上述鹽水噴霧測試（3 0次的甲醇擦拭和鹽水 噴霧測試），也未生銹。此時，可能係由退火，能將塗膜 內的殘留應力在短時間使之解放。並且，更強化塗膜的淬 火，依塗膜也可能會有。再者，對上述實行退火者，不進 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -8- (請先閱讀背面之注意事項再 本頁) 經濟部智慧財產局員工消費合作社印製492895 A7 B7 V. Description of Invention (5) Next, the function of this embodiment will be described, that is, the effect of adding the above-mentioned annealing and heating project will be explained. First, when the spray-painted steel sheet 1 is bent, as shown in FIG. 3, residual stress is left on the surface coating film of the bent parts 2 a and 2 b, and micro-cracks may be generated due to the addition of a cleaning agent. / Further, whether or not the fine cracks have occurred can be determined by the following salt water spray test. This salt water spray test is performed by rubbing the surface of the above-mentioned bent portions 2 a and 2 b 30 times with methanol, for example (so-called methanol rubbing), and then spraying the salt water with the salt water spray test (for example, at 30). After 0 hours, a test to determine whether it is rusty. In this test, it was found that the coating film on the surfaces of 2a and 2b during bending was finely cracked due to rust. Furthermore, it has been experimentally known that if the above-mentioned methanol rubbing is not performed 30 times, even if the salt spray test is performed, it will not rust. That is, the above-mentioned methanol may cause fine cracks or swelling of the coating film, and may promote the invasion of water into the coating film. Then, in the actual use environment of the refrigerator, the user is wiped with a cleaning agent using an alcohol system, and the cleaning operation is reproduced with the methanol wipe described above. Then, after the above-mentioned bending process, an annealing and heating process (heating process) is performed, and the above-mentioned residual stress can be eliminated when the bent-processed part in the painted steel sheet 1 is heated. Practically, the above-mentioned annealing heating engineer carried out the above-mentioned salt water spray test (30 times of methanol wiping and salt water spray test), and did not rust. In this case, it is possible that the residual stress in the coating film can be released in a short time by annealing. In addition, hardening of the coating film may be performed depending on the coating film. Furthermore, for those who implement the above annealing, the Chinese paper standard (CNS) A4 (210 X 297 mm) is not applicable for the paper size. -8- (Please read the precautions on the back before this page) Bureau of Intellectual Property, Ministry of Economic Affairs Printed by Employee Consumer Cooperative
適 度 尺 張 紙 本 經濟部智慧財產局員工消費合作社印製 492895 A7 B7 五、發明說明（6 ) 行3 〇次之甲醇擦拭，而僅實鹽水噴霧測試時，當然未生 錄。 在此，將本發明人等實驗的結果，示如以下之表1。 〔表4〕 彎曲加工後之退火（ 加熱） 甲醇擦拭 生銹 Nol 無 ^ΓΤΤ ΙΠΡ 無 No2 無 有（30次） 有 N〇3 有 (100 t X 30 分） Μ j \ \\ No4 有 (100 °C X 30 分） 有（30次） 並 j\\\Moderate paper Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 492895 A7 B7 V. Description of the invention (6) The methanol was wiped 30 times, but it was of course not recorded during the salt water spray test. The results of experiments performed by the present inventors are shown in Table 1 below. [Table 4] Annealing (Heating) After Bending Processing Methanol Wiping Rust Nol ^ ΓΤΤ ΙΡΡ No No2 No Yes (30 times) Yes No 03 Yes (100 t X 30 minutes) Μ j \ \\ No4 Yes (100 ° CX 30 minutes) Yes (30 times) and j \\\
從該表1，可知根據本實施例時，亦即，由於噴漆鋼 板1的彎曲加工後，進行退火加溫工程，能夠防止在進行 噴漆鋼板1的彎曲加工時之被彎曲加工的彎曲加工部2 a ，2b表面之塗膜劣化。然後，根據上述實施例時，做爲 噴漆鋼板1的底子，將能使用冷軋鋼板（亦即，S P C CFrom this Table 1, it can be seen that according to the present embodiment, that is, since the annealing and heating process is performed after the bending process of the painted steel plate 1, the bending processing portion 2 can be prevented during the bending process of the painted steel plate 1. The coating film on the surface of a, 2b is deteriorated. Then, according to the above-mentioned embodiment, as the base of the painted steel sheet 1, a cold-rolled steel sheet (that is, S P C C
I )，比將鋅鋼板做爲底子之已往構成，能夠降低外殼3之 製造成本。 再者，雖然在上述實施例，係在退火加溫工程（加熱 工程），係構成將彎曲加工的噴漆鋼板1全體投入爐中， 例如以1 0 Ot加熱3 0分鐘，可是並不限於此，只需適 當地變更加熱溫度或加熱時間即可。例如，也可以設定成 加熱溫度爲8 0°C — 1 5 0°C程度的範圍，並且把加熱時 國國家標準（CNS)A4規格（210 χ 297公釐） 9 492895 A7 經濟部智慧財產局員工消費合作社.印製 B7__五、發明說明（7 ) 間做爲3秒〜3 0分程度。此時，愈提高加熱溫度，能夠 縮短加熱時間。 並且，雖然在上述實施例，係構成將被彎曲加工的噴 漆鋼板1全體加熱，可是，也可以構成把噴漆鋼板1中之 僅被彎曲加X部份加熱。例如，第4圖所示之第2實施例 的噴漆鋼板之加工方法爲理想。 、 在該第2實施例，係如第4圖所示，構成將噴漆鋼板 1中，僅被彎曲加工的部份2，以高頻加熱裝置之高頻加 熱頭8加熱。在上述高頻加熱頭8，係構成將從未圖示的 高頻發生裝置被供給高頻。然後，在該構成時，係構成把 高頻加熱頭8側固定，以使被彎曲加工部份2接近高頻加 熱頭8之狀態，使噴漆鋼板1側向第4圖中箭頭記號方向 移，而把上述被彎曲加工部份2連續地高頻加熱。 再者，上述以外的第2實施例之構成，係成爲和第1 實施例相同的構成。因此，在第2實施例，也能得到和第 1實施例略相同之作用效果 考 並且，雖然在上述第4,11施例，係構成僅將噴漆鋼板 1中被彎曲力Π工部份2，由\||_加熱頭8加熱，可是並不 限於此，例如也可以構成以1¾¾線加熱器加熱。而且，也 可以構成僅在噴漆鋼板1中被彎曲加工部份2噴上熱風（ 例如200 °C以上的熱風），把上述部份2加熱。更且， 也可以構成將熱水澤在噴漆鋼板1中之被彎曲加工部份2 予以加熱。 一方面，在製遣冰箱時，備有將尿烷泡沬發泡充塡在 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐）-10- ' (請先閱讀背面之注意事 — II ·h. «ϋ ϋ ϋ I I ϋ I^OJ· ·ϋ ϋ ϋ ϋ ϋ · 本頁) 線“ 492895 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（8 ) 外殻和內箱之間，形成絕熱箱體的工程，在該工程，爲了 把尿烷泡沬發泡充塡，而使用預熱爐把外殻預熱。因此， 在以該預熱爐將外殼加熱的預熱時，構成把前述之加熱工 程（退火加溫工程）同時進行爲理想。 並且，雖然在上述各實施例，係使用在以冷軋鋼板（ SPCC)做爲底子的鋼板將塗膜塗層之噴漆鋼板1，可 是，也可以代之，而使用在以鋅鋼板做爲底子的鋼板，把 塗膜塗層者β根據該構成時，能夠更提高耐蝕（防銹）性 會έ ο . 再者，雖然在上述各實施例，係將本發明適用在備有 將噴漆鋼板1 C RF成形的工程之方法，可是並不限於此 ，也可以適用在例如備有將噴漆鋼板沖壓成形的工程之方 法，該構成時，只需構成將沖壓成形後之噴漆鋼板加熱即 可〇 〔發明之效果〕 本發明，係如以上所顯示，因備有將噴漆鋼板彎曲加 工的彎曲加工工程，和將噴漆鋼板之中至少被彎曲加工的 部份加熱之加熱工程，故將噴漆鋼板彎曲加工時，能使在 被彎曲加工部份的塗膜發生之殘留應力消滅，而發揮能防 止上述被彎曲加工部份的塗膜劣化之優異效果。 〔圖面之簡單說明〕 〔第1圖〕 (請先閲讀背面之注意事項 --- 再本頁) 訂·· •線」 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -11 - 492895 A7 B7 五、發明說明（9 ) 係顯示本發明的第1實施例者，爲顯示外殻的製造工 程之流程表。 •〔第2圖〕 係槪略顯示外殼及冰箱的製造工程之圖。 〔第3圖〕 係顯示噴漆鋼板的被加工部份之部份側視圖，。 〔第4圖〕 係顯示本發明的第2實施例者，爲顯示噴漆鋼板及高 頻加熱頭之斜視圖。 〔圖號說明〕 (請先閱讀背面之注意事項再9本頁) 經濟部智慧財產局員工消費合作社·印製 1 噴漆鋼板 2 部份 3 外殻 6 絕熱箱體 7 冰箱 8 高頻加熱頭 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -12 ·I) Compared with the conventional structure using zinc steel plate as a substrate, the manufacturing cost of the casing 3 can be reduced. Moreover, in the above-mentioned embodiment, although the annealing heating process (heating process) is used, the whole of the spray-painted steel plate 1 that is bent is put into the furnace, and it is heated for 10 minutes at 10 Ot, but it is not limited to this. Just change the heating temperature or heating time appropriately. For example, you can set the heating temperature in the range of 80 ° C to 150 ° C, and set the national standard (CNS) A4 specification (210 χ 297 mm) 9 492895 A7 Intellectual Property Bureau of the Ministry of Economic Affairs Employee Consumption Cooperative. Printed B7__ V. Invention description (7) is made between 3 seconds and 30 minutes. In this case, the higher the heating temperature, the shorter the heating time. Furthermore, in the above-mentioned embodiment, the whole of the painted steel plate 1 to be bent is heated, but it is also possible to heat only the painted steel plate 1 by bending and adding X. For example, the processing method of the painted steel sheet of the second embodiment shown in Fig. 4 is preferable. In this second embodiment, as shown in Fig. 4, the portion 2 of the spray-painted steel sheet 1 which is only subjected to bending is heated by a high-frequency heating head 8 of a high-frequency heating device. The high-frequency heating head 8 is configured to supply a high-frequency to a high-frequency generating device (not shown). Then, in this configuration, the system fixes the high-frequency heating head 8 side so that the bent portion 2 approaches the high-frequency heating head 8 and moves the side of the painted steel plate 1 to the direction of the arrow mark in FIG. 4. The bent portion 2 is continuously heated at a high frequency. The configuration of the second embodiment other than the above is the same as that of the first embodiment. Therefore, in the second embodiment, the same effect as the first embodiment can be obtained. In addition, although in the fourth and eleventh embodiments described above, only the bending force in the spray-painted steel plate 1 is included in the working portion 2 It is heated by the \ || _ heating head 8, but it is not limited to this. For example, it may be configured to be heated by a 1¾¾ wire heater. Furthermore, it is also possible to spray hot air (for example, hot air at a temperature of 200 ° C or more) to the bent portion 2 of the painted steel plate 1 to heat the above portion 2. Furthermore, it is also possible to heat the bent portion 2 of the painted steel sheet 1 by heating the hot water. On the one hand, when manufacturing refrigerators, there is a method for filling urethane foam with foam and filling it at the size of this paper to apply Chinese National Standard (CNS) A4 (210 X 297 mm) -10- '(Please read the Attention — II · h. «Ϋ ϋ ϋ II ϋ I ^ OJ · · ϋ ϋ ϋ ϋ ϋ · (This page) Printed on the line" 492895 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs V. Invention Description (8) The process of forming an insulated box between the shell and the inner box. In this process, a preheating furnace is used to preheat the shell in order to foam and fill the urethane foam. Therefore, the shell is preheated by the preheating furnace. In the preheating of heating, it is desirable to simultaneously perform the above-mentioned heating process (annealing and heating process). In addition, in each of the above embodiments, the coating is applied to a steel sheet using cold-rolled steel sheet (SPCC) as a substrate. The coated painted steel sheet 1 can be used instead. However, the zinc coated steel sheet is used as the substrate. When the coating film β is formed according to this structure, the corrosion resistance (rust prevention) can be further improved. Ο Furthermore, although in the above embodiments, the present invention is applied to The method of the 1 C RF forming process of the steel plate is not limited to this, and it can also be applied to, for example, a method having a process of press-forming a spray-painted steel plate. In this configuration, it is only necessary to constitute a method for heating the spray-painted steel plate after forming 〇 [Effects of the Invention] As shown in the above, the present invention includes a bending process for bending a painted steel plate and a heating process for heating at least a portion of the painted steel plate, which is a bending process. During the bending process, the residual stress occurring in the coating film in the bent portion can be eliminated, and the excellent effect of preventing the deterioration of the coating film in the bent portion can be exerted. [Simplified description of the drawing] [Figure 1 〕 (Please read the precautions on the back --- then on this page) Ordering ·· • Threads》 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -11-492895 A7 B7 V. Invention Explanation (9) shows the first embodiment of the present invention and is a flow chart showing the manufacturing process of the casing. • [Figure 2] This is a drawing showing the manufacturing process of the casing and refrigerator. [Figure 3] This is a partial side view showing the processed part of the painted steel sheet. [Fig. 4] This is a perspective view showing a second embodiment of the present invention, showing a painted steel plate and a high-frequency heating head. [Illustration of drawing number] (Please read the precautions on the back first and then 9 pages) Employee Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs · Printing 1 Painted steel plate 2 Part 3 Outer case 6 Insulated box 7 Refrigerator 8 High-frequency heating head Paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -12 ·