KR0136409B1 - Back plate constructing method for a refrigerator - Google Patents
Back plate constructing method for a refrigeratorInfo
- Publication number
- KR0136409B1 KR0136409B1 KR1019950018838A KR19950018838A KR0136409B1 KR 0136409 B1 KR0136409 B1 KR 0136409B1 KR 1019950018838 A KR1019950018838 A KR 1019950018838A KR 19950018838 A KR19950018838 A KR 19950018838A KR 0136409 B1 KR0136409 B1 KR 0136409B1
- Authority
- KR
- South Korea
- Prior art keywords
- bending
- plate
- refrigerator
- thick plate
- predetermined
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/04—Bending or folding of plates or sheets
- B29C53/06—Forming folding lines by pressing or scoring
- B29C53/063—Forming folding lines by pressing or scoring combined with folding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/06—Walls
- F25D23/062—Walls defining a cabinet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/762—Household appliances
- B29L2031/7622—Refrigerators
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Refrigerator Housings (AREA)
Abstract
본 발명은 냉장고 후판의 제작방법에 관한 것으로서, 제품별에 따라 그에맞는 고정된 금형장치를 사용하는 대신 해당 벤딩공정 만큼의 길이조정이 자유로운 벤딩 장치를 구비하여 자동화라인을 이루어 서너차례의 벤딩작업으로써 냉장고 후판을 경제적으로 제작할 수 있도록 하며, 그 기술적인 수단으로써는 길이조정이 자유로운 벤딩장치를 이용하여 판상의 후판 양측을 수직상방향으로 1차 벤딩한 후에, 1차 벤딩에 의한 제1중심폭의 소정길이 내측을 중심으로 그 양측이 일정각도로 경사지게 2차 벤딩시킨 다음에, 2차 벤딩에 의한 제2중심폭의 소정길이 내측 중심으로 제3주심폭을 하방향절곡되게 3차 벤딩하여서, 판상의 후판을 3차 벤딩처리하여 소정 절곡형상의 후판으로 제작하는 것을 특징으로 한다.The present invention relates to a method for manufacturing a rear plate of a refrigerator. Instead of using a fixed mold device according to a product, a bending device is freely adjusted as long as the corresponding bending process, and an automatic line is formed by three or four bending operations. It is possible to economically manufacture the rear plate of the refrigerator, and as a technical means, by bending the freely adjustable length of the plate on both sides of the plate in the vertical and vertical direction, the first center width of the first bending The secondary bend is inclined at a predetermined angle with respect to the inner side of the predetermined length, and then the third main width is bent downward to the inner side of the predetermined length of the second center width by the secondary bending to form a plate shape. It is characterized in that the thick plate of the third bending process to produce a thick plate of a predetermined bending shape.
Description
제1도 (a)(b)(c)는 종래 기술에 따른 냉장고 후판의 제작공정도Figure 1 (a) (b) (c) is a manufacturing process diagram of the back plate of the refrigerator according to the prior art
제2도 (a)(b)(c)는 본 발명에 따른 냉장고 후판의 제작공정도2 (a) (b) (c) is a manufacturing process diagram of the back plate of the refrigerator according to the present invention
*도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
40 : 냉장고 후판W1 : 후판의 제1중심폭40: refrigerator thick plate W1: first center width of thick plate
W2 : 후판의 제2중심폭W3 : 후판의 제3중심폭W2: Second center width of thick plate W3: Third center width of thick plate
본 발명은 냉장고의 후판 제조방법에 관한 것으로, 특히 제품별로 그 형태를 달리하는 냉장고 후판제작에 있어서 제품별에 따라 그에맞는 고정된 금형장치를 사용하지 않고서 해당 벤딩공정 만큼의 길이조정이 자유로운 벤딩장치를 구비하여 냉장고 후판을 서너차례의 벤딩처리만으로 후판을 경제적으로 제작할 수 있도록 한 냉장고의 후판 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a thick plate of a refrigerator, and in particular, in the manufacture of a refrigerator plate having a different shape for each product, a bending device free to adjust the length as long as the corresponding bending process without using a fixed mold device according to each product. The present invention relates to a method for manufacturing a thick plate of a refrigerator in which a thick plate of the refrigerator is economically manufactured by only three or four bending processes.
종래에는 냉장고 후판을 제작하기 위해서는 제1도에 도시한 것과 같이, 해당 제품별 크기에 맞는 프레스장치(10)(20)(30)를 구비하여서 판상의 후판(40)을 드로잉공정(a)과 트림공정(b)을 거쳐 벤딩공정(c)에 의해서 후판(40)의 형상을 제작하였으며, 이때의 후판제작에 있어 냉장고의 기종에 따라 그 후판(40) 형태를 달리하므로 후판(40) 형태에 따라 각 처리공정에 해당되는 프레스장치(10)(20)(30)를 달리하여서 해당되는 기종 만큼의 프레스장치(10)(20)(30)를 준비하여 후판(40)을 제작하여야만 하였다.Conventionally, in order to manufacture a refrigerator back plate, as shown in FIG. 1, a press device 10, 20, 30 suitable for the size of each product is provided, and the plate-shaped thick plate 40 is drawn in a drawing process (a) and The shape of the thick plate 40 was produced by the bending process (c) through the trimming process (b). In the manufacture of the thick plate at this time, the shape of the thick plate 40 varies depending on the type of refrigerator. According to the press apparatus 10, 20, 30 corresponding to each treatment process according to the press device 10, 20, 30 as much as the corresponding model had to prepare a thick plate 40.
상기와 같은 프레스장치(10)(20)(30)에 의한 냉장고 후판(40)의 제조방법을 살펴보면, 최초 판상의 후판(40)을 유압프레스(10)로 드로잉가공하는 단계로써 200-300ton 정도의 유압프레스(10) 하측의 고정다이(12) 중앙에 위치한 형틀다이(14) 위에 판상의 후판(40)을 올려놓고서, 상측의 이동다이(16)로 와이프다운(wipen down)시켜 후판(40)의 중앙을 W1,W2 크기의 경사폭을 갖도록 H1의 높이로 드로잉가공하며, 상기 드로잉가공한 후판(40)을 다음 단계인 250-350ton 정도의 크랭크프레스(20)의 고정다이(22) 위에 위치한 형틀다이(24) 위에 올려놓고서 상측 이동다이의 펀치(26)가 드로잉공정에 의해 불필요하게 너울형상으로 비틀려진 후판(40) 측면의 테두리를절단가공하는 트림공정을 거치고, 상기 트림가공한 후판(40)을 다시 200-300ton 정도의 크랭크프레스(30) 고정다이(32)의 형틀다이(34) 위에 올려놓고 후판의 양측 테두리를 상측 이동다이(36)로 벤딩가공하여 소정의 냉장고 후판(40) 형상을 완성하였다.Looking at the manufacturing method of the rear plate 40 of the refrigerator by the press apparatuses 10, 20, 30 as described above, 200-300 ton as a step of drawing the first plate-shaped rear plate 40 by the hydraulic press 10 The plate-shaped rear plate 40 is placed on the die 14 located in the center of the fixed die 12 below the hydraulic press 10 of the hydraulic press 10, and then wiped down with the upper moving die 16. ) Is drawn to the height of H1 so as to have an inclination width of W1 and W2, and the drawing plate is then plated on the fixed die 22 of the crank press 20 of about 250-350 tons. The punch 26 of the upper movable die is placed on the mold die 24, and the trimming process is performed to cut the edge of the side surface of the thick plate 40 which is unnecessarily twisted into the shape of the shoulder by the drawing process. (40) again the mold of the crank press 30 fixed die 32 of about 200-300ton The 34 placed on both sides by bending the rim of the plate to the upper moving die 36, thereby completing the predetermined refrigerator plates 40 shape.
이와같이 종래기술에서는 소정의 형태로 몇차례 절곡시키는 후판(40)을 제작하기 위하여 각 절곡공정에 따라 그에 맞는 프레스장치(10)(20)(30)를 이용하여 후판(40)을 제작하였으나, 냉장고 기종에 따라 그 형태를 달리하는 후판(40)을 제작하기 위해서는 상술한 유압프레스(10) 및 크랭크프레스(20)(30)를 냉장고 후판(40)의 형태에 맞게 그때마다 따로따로 구비하여야 하는 불편과, 이에따른 금형제작에 소용되는 제작비용이 불필요하게 낭비되어 제작원가가 상승되는 것은 물론, 해당 프레스장치(10)(20)(30)의 교체시간에 따른 원인 등으로 인해 대량생산이 가능한 확실한 자동라인을 구축하기가 어려운 문제점이있었다.As described above, in order to manufacture the rear plate 40 which is bent several times in a predetermined form, the rear plate 40 is manufactured using press apparatuses 10, 20 and 30 according to each bending process. In order to manufacture the thick plate 40, which varies in shape depending on the model, the inconvenience of having to separately provide the hydraulic press 10 and the crank press 20, 30 described above to the shape of the refrigerator rear plate 40 at each time. And, as a result, the production cost, which is unnecessary for the mold manufacturing, is wasted, which leads to an increase in the manufacturing cost, as well as the possibility of mass production due to the cause due to the replacement time of the press apparatus 10, 20, 30. It was difficult to build an automatic line.
본 발명은 상술한 종래기술의 프레스장치에 의한 냉장고 후판 제작방법의 문제점을 해결하기 위하여 안출한 것으로, 제품별에 따라 그에맞는 고정된 프레스장치를 사용하는 대신, 해당 벤딩공정 만큼의 길이조정이 자유로운 벤딩장치를 구비하여 자동화라인을 이루어, 서너차례의 벤딩작업으로써 냉장고 후판을 경제적으로 제작할 수 있는 냉장고 후판의 제작방법을 제공함에 그 목적이 있다.The present invention has been made to solve the problems of the manufacturing method of the refrigerator plate by the conventional press apparatus described above, and instead of using a fixed press device according to the product, length adjustment as much as the bending process is free. It is an object of the present invention to provide a method for manufacturing a refrigerator rear plate that can be economically produced by forming a refrigerator line by bending a plurality of bending operations by providing a bending line device.
상기의 목적을 실현하기 위한 기술적인 수단으로써는, 본 발명은 길이조정이 자유로운 벤딩장치를 이용하여 판상의 후판 양측을 수직상방향으로 1차 벤딩한 후에, 1차 벤딩에 의한 제1중심폭의 소정길이 내측을 중심으로 그 양측이 일정각도로 경사지게 2차 벤딩시킨 다음에, 2차벤딩에 의한 제2중심폭의 소정길이 내측 중심으로 제3중심폭을 하방향절곡되게 3차 벤딩처리하여서, 판상의 후판을 3차 벤딩처리하여 소정 절곡형상의 후판으로 제작하는 것을 특징으로 한다.As a technical means for realizing the above object, the present invention uses the bending device of which length is freely adjusted, and then, after primary bending of both sides of the thick plate on the plate in the vertical direction, the first center width by the primary bending is obtained. The secondary bend is inclined at a predetermined angle about both sides of the inside of the predetermined length, and then the third bending process is performed to bend the third center width downward to the inner side of the predetermined length of the second center width by the second bending. The plate-shaped thick plate is subjected to the third bending process to produce a thick plate of a predetermined bending shape.
이하에 본 발명의 기술적 사상에 따른 후판 제작방법의 바람직한 실시예를 첨부된 도면에 의거하여 설명하면 다음과 같다.Hereinafter, a preferred embodiment of a thick plate manufacturing method according to the spirit of the present invention will be described with reference to the accompanying drawings.
제2도 (a)(b)(c)는 본 발명에 따른 냉장고 후판(40)의 제작공정도로써, 후판(40) 벤딩가공에 적용되는 벤딩장치(50)의펀치(52)(54)(62)(64)(72)(74)는 후판(40)의 제작형태에 따라 그 길이조절이 가능하다.FIG. 2 (a) (b) (c) is a manufacturing process diagram of the refrigerator rear plate 40 according to the present invention, and the punches 52 and 54 of the bending device 50 applied to the bending process of the rear plate 40 ( 62, 64, 72, 74 can be adjusted in length depending on the manufacturing form of the thick plate (40).
상기 벤딩장치(50)의 프레임(54) 위에 판상의 후판(40)을 올려놓고 주펀치(52)를 수직하강시키는 동시에 하펀치(54)를 수직상방향 회전작동시키면, 제1중심폭(W1)을 중심으로 그 양측이 상방향으로 수직절곡된다(1차 벤딩공정). 이때 1차 벤딩가공은 주펀치(52)에 의한 후판(40)의 제1중심폭(W1)을 중심으로 그 양측에 너울형태로 쭈굴쭈굴해지는 변형이 일어나는 현상을 초래하지 않는다.When the plate-shaped rear plate 40 is placed on the frame 54 of the bending device 50, the main punch 52 is vertically lowered, and the lower punch 54 is vertically rotated to operate. The two sides are vertically bent upward with respect to the (first bending process). At this time, the first bending process does not cause a phenomenon that the curling deformation occurs in the form of a shoulder on both sides of the first center width W1 of the thick plate 40 by the main punch 52.
상기 1차 벤딩공정을 마친 후판(40)은 2차 벤딩공정으로 이송되며, 1차 벤딩장치(50) 위에는 또다른 후판(40)이 연속적으로 이송도착되어 상술한 1차 벤딩공정을 수행한다.After the first bending process, the rear plate 40 is transferred to the second bending process, and the second plate 40 is continuously transported and deposited on the first bending device 50 to perform the above-described first bending process.
상기 2차 벤딩공정으로 이송되는 후판(40)은 또다른 2차 벤딩장치(60)의 프레임(68) 위쪽에 위치한 주펀치(62) 위쪽으로 안착된 후에, 상펀치(66)가 수직하강되면서 동시에 그 양측으로 하펀치(64)가 일정각도로 회전작동하며, 이때 양쪽 하펀치(64) 사이의 간격은 후판(40)의 제2중심폭(W2)에 맞쳐진 상태로써 회전작동되어 후판(40) 양측이 일정각도로 경사지게 절곡되면서 그 제2중심폭(W2)은 수평 일직선상태를 유지한다.The thick plate 40 transferred to the secondary bending process is seated above the main punch 62 located above the frame 68 of another secondary bending device 60, and the upper punch 66 is vertically lowered. At the same time, the lower punch 64 is rotated at a predetermined angle to both sides thereof, and the gap between the lower punches 64 is rotated in a state in which it is fitted to the second center width W2 of the rear plate 40 so that the rear plate ( 40) As both sides are bent at an angle, the second center width W2 is maintained in a horizontal straight state.
상기 2차 벤딩공정을 마친 후관(40)은 다시 3차 벤딩공정으로 이송되며, 2차 벤딩장치(60) 위에는 1차 벤딩처리된 후판(40)이 연속적으로 이송도착되어 상술한 2차 벤딩공정을 수행한다.After the second bending process, the rear tube 40 is transferred to the third bending process again, and the second bending process is performed on the second bending device 60 by successively conveying and depositing the first plate 40 that has been subjected to the first bending process. Do this.
상기 3차 벤딩공정으로 이송되는 후판(40)은 또다른 3차 벤딩장치(70)의 프레임(78) 위쪽으로 안착된 다음에, 주펀치(72)가 수직하강되면서 동시에 하펀치(74)가 상방향 회전작동되며, 이때 양쪽 주펀치(72) 사이의 간격이 후판(40)의 제3중심폭(W3)에 맞쳐진 상태로써 수직작동되면서 후판(40)의 제3중심폭(W3)을 하방향 절곡시키고, 동시에 히펀치(74)의 상방향 회전작동에 의해 후판(40) 양측이 위쪽으로 상승절곡하여 제3중심폭(W3)과 수직상태로 절곡된 형태를 이룬다.The thick plate 40 transferred to the third bending process is seated above the frame 78 of another third bending device 70, and then the lower punch 74 is simultaneously lowered while the main punch 72 is vertically lowered. It is rotated upwardly, wherein the interval between the two main punches 72 is vertically operated in a state in which the gap between the main punches 72 is fitted to the third center width W3 of the rear plate 40, thereby increasing the third center width W3 of the thick plate 40. At the same time, the bottom plate 40 is bent upwardly by the upward rotation operation of the hip punch 74 to form a shape bent vertically with the third center width W3.
상기 3차 벤딩공정의 후판(40) 양측 아래쪽에는 지지대(75)가 배치되어 후판(40) 양측이 순간적으로 상방향 절곡상승되면서 발생되는 형태변화를 잡아주는 역할을 하며, 해당 벤딩공정을 거친 후판(40)은 벤딩장치(50)(60)(70)의 설치된 센서(미도시 함)에 의해 감지되어 차기공정으로 이송된다.The support plate 75 is disposed at both lower sides of the rear plate 40 of the third bending process, and serves to catch the change in shape caused by both sides of the rear plate 40 momentarily bending upward. 40 is detected by a sensor (not shown) installed in the bending device 50, 60, 70 is transferred to the next process.
특히 본 발명에 의한 후관(40) 제라작인 냉장고 기종에 따라 수시로 교체하여야 하는 프레스장치(제1도의 10,20,30) 대신, 길이조절이 자유로운 벤딩장치(50)(60)(70)를 적용하여 후관(40)을 제작함으로써 제작라인이 일직선으로 단순화된다.In particular, instead of the press device (10, 20, 30 of FIG. 1) to be replaced at any time according to the fridge model of the rear tube 40 according to the present invention, the bending device 50, 60, 70 is freely adjustable By manufacturing the rear tube 40, the production line is simplified in a straight line.
이와같이 냉장고 후판 제작에있어, 제품별에 따라 그에맞는 고정된 프레스장치를 사용하는 대신 해당 벤딩공정 만큼의 길이조정이 자유로운 벤딩장치를 구비하여 자동화라인을 이루어서 서너차례의 벤딩작업만으로 냉장고 후판을 제작하는 본 발명은, 제품별 형태에 따라 그때마다 제품규격에 맞는 프레스장치를 준비할 필요가 없으며, 또한 프레스장치의 드로잉공정에 따른 후판 측면의 찌그러짐이 발생되어 트림공정을 반드시 거쳐야 하는 불편을 제거할 수 있고, 그에따른 금형제작에 소용되는 제작비용을 절감시켜 제작원가를 절감시킬수 있으며, 무었보다도 좁은 공간에서 고정적인 자동화라인을 구축시킬수 있어 경제적인 제품생산을 제공할수 있는 효과를 제공한다.Thus, in the manufacture of the refrigerator plate, instead of using a fixed press device according to each product, it is equipped with a bending device that can be freely adjusted as long as the corresponding bending process to make an automated line to produce the refrigerator plate by only three or four bending operations. According to the present invention, it is not necessary to prepare a press device that meets the specifications of the product according to the form of the product at each time, and the distortion of the side of the thick plate is generated according to the drawing process of the press device, thereby eliminating the inconvenience of having to go through the trimming process. In addition, the manufacturing cost can be reduced by reducing the manufacturing cost that is used for the mold manufacturing, and it is possible to build a fixed automation line in a narrow space than anything else and provide economical product production.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950018838A KR0136409B1 (en) | 1995-06-30 | 1995-06-30 | Back plate constructing method for a refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950018838A KR0136409B1 (en) | 1995-06-30 | 1995-06-30 | Back plate constructing method for a refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR970002226A KR970002226A (en) | 1997-01-24 |
| KR0136409B1 true KR0136409B1 (en) | 1998-07-01 |
Family
ID=19419252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019950018838A KR0136409B1 (en) | 1995-06-30 | 1995-06-30 | Back plate constructing method for a refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR0136409B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101416224B1 (en) * | 2012-03-23 | 2014-07-08 | 코리아콜드시스템(주) | A press processing method for a sheet of sreel for marking the internal floor of made to order refrigerator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9172115B2 (en) | 2012-06-12 | 2015-10-27 | Milwaukee Electric Tool Corporation | Battery pack with multiple water discharge pathways |
-
1995
- 1995-06-30 KR KR1019950018838A patent/KR0136409B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101416224B1 (en) * | 2012-03-23 | 2014-07-08 | 코리아콜드시스템(주) | A press processing method for a sheet of sreel for marking the internal floor of made to order refrigerator |
Also Published As
| Publication number | Publication date |
|---|---|
| KR970002226A (en) | 1997-01-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100668068B1 (en) | Line Array Roll Set for the Manufacture of Various Doubly Curved Sheet Metals and Forming Method Thereby | |
| GB2353748A (en) | Forming press apparatus | |
| KR0136409B1 (en) | Back plate constructing method for a refrigerator | |
| JP2864229B2 (en) | Wave forming machine | |
| CN105710209A (en) | Side punching type progressive die for bending forming of rocker arm body | |
| CN205763290U (en) | A kind of diel of elongated handware | |
| CN108356144A (en) | A kind of process for stamping and mold for air bag substrate production | |
| CN210523533U (en) | Common blanking die device for inner plate and outer plate of automobile blank | |
| US5361619A (en) | Process and apparatus for press forming | |
| US3421466A (en) | Sink-forming method | |
| KR20200033528A (en) | Molding device for forming subway window frame | |
| CN213223960U (en) | Spoke forming die | |
| CN204396670U (en) | A kind of processing mold of connection bracket of automotive seat | |
| CN204564926U (en) | A kind of processing mold of spacing inserted sheet of controller | |
| CN205587517U (en) | Rocker body bends and takes shape side blow class and upgrade mould | |
| CN207823735U (en) | A kind of outer location structure reducing material scrap (bridge) distance for stage die | |
| CN213195277U (en) | Progressive die of automobile engine support | |
| CN213317197U (en) | Automatic stamping compound die for fixed angle plate | |
| CN209792382U (en) | Novel interactive bevel angle slide wedge structure | |
| KR19990010196U (en) | Sequential Feed Mold | |
| CN218835747U (en) | Multi-station stamping assembly line | |
| CN211492909U (en) | Double-deck hot press die sinking lazytongs | |
| KR101874529B1 (en) | Presses and press processing methods | |
| CN210996069U (en) | Symmetrical multi-step bending one-step forming die | |
| CN214417456U (en) | Progressive die for stamping outer ring of angular contact ball bearing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant | ||
| FPAY | Annual fee payment |
Payment date: 20030107 Year of fee payment: 6 |
|
| LAPS | Lapse due to unpaid annual fee |