EP3164232B1 - Method for producing cutlery and a cutlery blankig tool - Google Patents

Method for producing cutlery and a cutlery blankig tool Download PDF

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Publication number
EP3164232B1
EP3164232B1 EP15815823.8A EP15815823A EP3164232B1 EP 3164232 B1 EP3164232 B1 EP 3164232B1 EP 15815823 A EP15815823 A EP 15815823A EP 3164232 B1 EP3164232 B1 EP 3164232B1
Authority
EP
European Patent Office
Prior art keywords
blanking
die
punch
cutlery
holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15815823.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3164232A1 (en
EP3164232A4 (en
Inventor
Lars ALMBLAD
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ikea Supply AG
Original Assignee
Ikea Supply AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ikea Supply AG filed Critical Ikea Supply AG
Publication of EP3164232A1 publication Critical patent/EP3164232A1/en
Publication of EP3164232A4 publication Critical patent/EP3164232A4/en
Application granted granted Critical
Publication of EP3164232B1 publication Critical patent/EP3164232B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/60—Making other particular articles cutlery wares; garden tools or the like
    • B21D53/62—Making other particular articles cutlery wares; garden tools or the like spoons; table forks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/60—Making other particular articles cutlery wares; garden tools or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/14—Dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/60—Making other particular articles cutlery wares; garden tools or the like
    • B21D53/64—Making other particular articles cutlery wares; garden tools or the like knives; scissors; cutting blades

Definitions

  • the present invention is directed to the production of cutlery. It is directed both to a method of producing cutlery and a blanking tool to be used in producing cutlery.
  • Cutlery is normally made in a number of steps, which steps comprise blanking, trimming and grinding.
  • the trimming and grinding steps are often performed a number of times, between other steps.
  • Each piece of cutlery is often made by blanking of a sheet metal of stainless steel.
  • the first part of the cut of the cutlery blank will be relatively sharp while the next part will be relatively rough. This is a well-known phenomenon and is due to the fact that in the shearing process the first part will in practice be a cutting process while the second part will be a tearing process. The rough surface formed by the tearing process will have to be grinded rather extensively. Normally there is a clearance of between 10 to 15% between the blanking tool and the final dimension of the piece of cutlery. Thus, trimming is necessary to arrive with the final cutlery. For cutlery stainless steel is normally used. During each trimming and grinding step the material is heated. Such heating may influence the material, in that chromium is released from the stainless steel.
  • a prior art apparatus for producing a blank and a cutting technology for sheet metal can be found in for instance US4267753A and US2005/211032A1 , respectively.
  • a prior art method for producing cutlery and cutlery blanking tool according to the preamble of claims 1 and 8 respectively is known from CN202701091U .
  • the same presses as used today for blanking of cutlery may still be used.
  • the blanking is done in what can be called a hybrid fineblanking tool.
  • the blanking tool block guiding is used to stabilize movement in the tool.
  • the clearance between the blanking tool and the final dimension of the piece of cutlery may be reduced to between 0.1-2.0%, preferably to 0.2-1.5% and more preferably to about 0.5%.
  • the method of the present invention may be used without any anvil.
  • there is less material usage than in known fineblanking methods since in known fineblanking methods the holding means will need more material to hold on to.
  • the shearing By holding the sheet metal of which the cutlery is formed during the actual blanking, the shearing will be completely a cutting process with no or little tearing. Thus, the problem with part of the shearing being a tearing process is avoided. It is essential to hold the sheet metal fixed on the die during the blanking. A person skilled in the art realises that different means can be used to hold the sheet metal. In the embodiment shown in the enclosed drawings the sheet metal is held at the die by means of a spring loaded holder.
  • a piece of cutlery, or cutlery blank may be blanked from a pre-polished material.
  • the circumference of the cutlery blank is blanked by one blanking stroke in some embodiments. In other embodiments the circumference of the cutlery blank is blanked by two or more blanking strokes. In each such blanking stroke a part of the circumference of the cutlery blank is blanked.
  • a radius is formed on the edges to prevent sharp edges and burrs. Thereby, grinding and/or polishing steps are minimized.
  • the piece of cutlery is pressed into a tool having rounded surfaces to form the radii of the edges of the piece of cutlery.
  • the piece of cutlery is given its three dimensional shape. The steps following the third step may include final polishing, cleaning, quality control and packing.
  • the piece of cutlery is produced using fewer steps than in the traditional method of making cutlery. Fewer steps means less time to produce each piece of cutlery and less time will reduce the costs. Fewer steps also means better quality since no grinding and less polishing may be used thereby less chromium is released from the stainless steel. Compared to traditional production of cutlery the number of steps in the method of the present application is about half the number of steps of traditional production of cutlery.
  • the method according the present invention may be a grinding free method of producing cutlery.
  • through openings and/or notches are punched in the cutlery prior to punching the circumference of the cutlery.
  • the advantage with this embodiment is that through openings and/or notches may be arranged in a cutlery as an integrated part of the punching process. Through openings may for instance be used to enable storing the cutlery by hanging. Through openings may also be used for other purposes such as a punching step for improving the final cutlery.
  • the notches may for example be for producing the tines of a fork.
  • cutlery refers to table cutlery or tableware and comprises knives, spoons and forks.
  • the shown embodiment of one example of a cutlery blanking tool comprises three basic parts. Said parts are an upper part in the form of a punch 1, an intermediate part in the form of a holder 2, and a lower part in the form of a die 3.
  • the cutlery blanking tool is to be used in an ordinary press for blanking of cutlery.
  • the present invention is not directed to the press as such and as the function of such a press is well known to a person skilled in the art, the press will not be described further here.
  • the punch 1 comprises four guiding pins 4 placed adjacent the corners of the punch 1.
  • the punch 1 further comprises two guiding blocks 5. Said guiding pins 4 and guiding blocks 5 are used to distinctly guide the punch 1 in respect of the other parts of the cutlery blanking tool.
  • the punch 1 comprises a first blanking part 6, which in the shown embodiment is adapted for forming a knife. When producing forks or spoons the blanking part will have a shape corresponding with that particular fork or spoon.
  • the first blanking part 6 projects from the punch 1 on the side facing the holder 2 and the die 3.
  • the punch 1 comprises a further, or second, blanking part 7, which second blanking part 7 is used when blanking a recess.
  • the number of blanking parts 6, 7 of the punch 1 may vary depending on the design of the piece of cutlery to be produced.
  • the punch 1 may have one or more blanking parts 6, 7.
  • only one blanking part is provided, which blanking part has a basic part in the general shape of the actual piece of cutlery to be produced and also one or more further blanking parts protruding from said basic part.
  • Said further blanking parts are to form openings and/or recesses of the piece of cutlery.
  • the holder 2 has openings 8, for the guiding pins 4 of the punch 1, and guide openings 9, for the guiding blocks 5 of the punch 1. It also has openings 10, 11 for the blanking parts 6, 7 of the punch 1. All openings 8, 9, 10, 11 of the holder 2 are through openings.
  • the die 3 comprises openings 12, for the guiding pins 4 of the punch 1, and guide openings 13, for the guiding blocks 5 of the punch 1. Furthermore, the die 3 comprises openings 14, 15 for the blanking parts 6, 7 of the punch 1. The die 3 also comprises guides 16 for the material from which the cutlery is to be blanked.
  • cutlery blanking tool will differ somewhat depending on the type of cutlery to be produced.
  • a sheet metal 17 is placed on the die 3, as shown in Fig. 2A , whereby the blanking parts 6, 7 of the punch 1 goes down into the openings 14, 15 of the die 3, cutting out parts 18 of the sheet metal 17 corresponding to the form of the blanking parts 6, 7.
  • the punch 1 is meticulously guided by means of the guiding blocks 5 received in the guide openings 9, 13 of the holder 2 and the die 3, respectively.
  • the punch 1 and the holder 2 moves together as one unit towards the die 3, until the holder 2 hits the sheet metal 17 placed on the die 3.
  • the punch 1 will then continue its downward movement, and will move relative both the holder 2 and the die 3.
  • the punch 1 will move downwards until it has cut through the sheet metal 17, held between the die 3 and the holder 2.
  • the cut out parts 18, 20 will fall down from the openings 14, 15 of the die 3.
  • the distance between the punch 1 and the holder 2 is held fixed by means of springs (not showed) or the like, placed between the punch 1 and the holder 2.
  • the springs are compressed in the last part of the blanking movement, in which last part of the blanking movement the holder 2 will abut the sheet metal 17.
  • the force of the punch 1 will exceed the force of the means holding the distance between the punch 1 and the holder 2.
  • the sheet metal 17 can be held at the die 3 by other means than the holder described above. The important thing is that the sheet metal 17 is held fixed at the die 3 during the actual blanking.
  • the distance for the movement of the punch 1 during the last part of the blanking movement exceeds the thickness of the sheet metal 17. As indicated above there is no movement between the holder 2 and the die 3 during said last part of the blanking movement.
  • the movement of the punch 1 is stopped in that the punch 1 hits the holder 2.
  • the height by which respective blanking part 6, 7 protrudes from the punch 1, exceeds the sum of the thickness of the sheet metal 17 and the height of the openings 10, 11 of the holder 2 to receive said blanking parts 6, 7.
  • the stroke length for the punch 1 in the blanking step is about 10 mm.
  • Fig. 2A the set up of the cutlery blanking tool is illustrated. As indicated by the arrow, protruding parts of the punch 1 will be pushed into the holder 2.
  • a first step is shown, in which the sheet metal 17 has been pushed into a position for blanking of a first cut out part 18.
  • the sheet metal 17 is only placed covering one of the openings 14, 15 of the die 2 to receive the blanking parts 6, 7 of the punch 1.
  • one main blanking part can be provided with one or more further blanking parts protruding from said main blanking part.
  • the holder 2 is first stopped by hitting the sheet metal 17, while the punch 1 continues to move in relation to the holder 2. The punch 1 will continue to move downwards until it hits the holder 2, in which position one of the blanking parts 7 will go through the sheet metal 17, forming a through opening 19 in the sheet metal 17.
  • the tines of the fork are also formed of further blanking parts, which further blanking parts may be separated from or being part of a main blanking part.
  • the holder 2 and the punch 1 are moved upwards.
  • the holder 2 will be lifted from the sheet metal 17 and the punch 1 and the holder 2 will be separated, by means of the springs or the like, with a distance exceeding the thickness of the sheet metal 17.
  • the sheet metal 17 is free from the holder 2 it will be pushed further into the cutlery blanking tool.
  • the sheet metal 17 will be moved such a distance that the previously formed through opening 19 will be placed above the opening for the blanking part 6 having the shape of a knife.
  • a knife blank 20 is punched from the sheet metal 17, which knife blank 20 comprises the previously formed through opening 19.
  • Figs. 3A and 3B the end of a blanking stroke is shown. At said end of the blanking stroke, the blanking part 6 of the punch 1 has gone through the sheet metal 17, producing a knife blank 20. As indicated in Fig. 3B there is a clearance x between the blanking part 6 and the die 3.
  • the thickness of the sheet metal 17 used is between 2 and 6.0mm. Often the sheet metal 17 used for knives is thicker than the sheet metal 17 used for forks and spoons. In that the sheet metal 17 is held fixed during the actual blanking and that the movement of the punch 1 is meticulously guided, the clearance x, as shown in Fig. 3B , between the blanking parts 6, 7 of the punch 1 and the openings 12, 13 of the die 3 co-operating with said blanking parts 6, 7 can be small.
  • the clearance x between each opening 14, 15 of the die 3 for receiving the blanking parts 6, 7 of the punch 1 and the corresponding blanking part 6, 7 is 0.01mm. In other embodiments the clearance x between each opening 14, 15 of the die 3 for receiving the blanking parts 6, 7 of the punch 1 and the corresponding blanking part 6, 7 may be between 0.008mm and 0.05mm, and preferably between 0.01mm and 0.03mm.
  • the deburring die comprises an upper part 21 and a lower part 22.
  • the upper part 21 has a die space 23 and the lower part 22 has a corresponding die space 24.
  • a knife blank 20 is placed in one of the die spaces 23, 24, as indicated in Fig. 4A .
  • the knife blank 20 has straight edges, as indicated in Fig. 4B .
  • the upper and lower parts 21, 22 of the deburring die are pressed together, as indicated in Fig.
  • the next step is the final three dimensional forming of the pieces of cutlery.
  • Three dimensional forming of pieces of cutlery is a well known technique. It is normally made using a forming tool comprising a punch and a die. It is also known to use a hot forging process to give the three dimensional form.
  • cutlery After the final forming the cutlery is polished, cleaned, quality controlled and packed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Table Equipment (AREA)
  • Punching Or Piercing (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP15815823.8A 2014-07-04 2015-07-03 Method for producing cutlery and a cutlery blankig tool Active EP3164232B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1450850 2014-07-04
PCT/SE2015/050790 WO2016003362A1 (en) 2014-07-04 2015-07-03 Method for producing cutlery and a cutlery blankig tool

Publications (3)

Publication Number Publication Date
EP3164232A1 EP3164232A1 (en) 2017-05-10
EP3164232A4 EP3164232A4 (en) 2018-02-28
EP3164232B1 true EP3164232B1 (en) 2023-09-20

Family

ID=55019731

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15815823.8A Active EP3164232B1 (en) 2014-07-04 2015-07-03 Method for producing cutlery and a cutlery blankig tool

Country Status (7)

Country Link
US (1) US20170157663A1 (ko)
EP (1) EP3164232B1 (ko)
JP (1) JP2017524533A (ko)
KR (1) KR20170041689A (ko)
CN (2) CN106660104A (ko)
RU (1) RU2692139C2 (ko)
WO (1) WO2016003362A1 (ko)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107263037B (zh) * 2017-07-29 2019-04-12 佛山市顺创酒店制品有限公司 一种不锈钢餐盘加工工艺
CN110640045B (zh) * 2019-08-15 2022-07-19 嘉诚(厦门)工业有限公司 一种用于生产餐具的方法及餐具冲裁工具
KR102130556B1 (ko) * 2019-12-31 2020-07-06 (주)우성메텍 리어 어퍼암 성형 제작장치

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Publication number Priority date Publication date Assignee Title
US4267753A (en) * 1979-11-08 1981-05-19 Bennett Edward D Apparatus for producing a blank from stock material
US20050211032A1 (en) * 2004-03-26 2005-09-29 Hon Hai Precision Industry Co., Ltd. Cutting technology for metal sheet
CN202701091U (zh) * 2012-05-18 2013-01-30 韦家而 一种金属器具冲压成型装置

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Also Published As

Publication number Publication date
RU2692139C2 (ru) 2019-06-21
EP3164232A1 (en) 2017-05-10
CN113275478A (zh) 2021-08-20
EP3164232A4 (en) 2018-02-28
CN106660104A (zh) 2017-05-10
RU2017101001A (ru) 2018-08-06
KR20170041689A (ko) 2017-04-17
RU2017101001A3 (ko) 2018-12-28
JP2017524533A (ja) 2017-08-31
WO2016003362A1 (en) 2016-01-07
US20170157663A1 (en) 2017-06-08

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