EP0024005A2 - Procédé pour presser à sec des articles moulés - Google Patents

Procédé pour presser à sec des articles moulés Download PDF

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Publication number
EP0024005A2
EP0024005A2 EP80104444A EP80104444A EP0024005A2 EP 0024005 A2 EP0024005 A2 EP 0024005A2 EP 80104444 A EP80104444 A EP 80104444A EP 80104444 A EP80104444 A EP 80104444A EP 0024005 A2 EP0024005 A2 EP 0024005A2
Authority
EP
European Patent Office
Prior art keywords
filling
die
powder
working position
molded parts
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.)
Granted
Application number
EP80104444A
Other languages
German (de)
English (en)
Other versions
EP0024005A3 (en
EP0024005B1 (fr
Inventor
Horst Prof. Dr. Schreiner
Bernhard Rothkegel
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to AT80104444T priority Critical patent/ATE7870T1/de
Publication of EP0024005A2 publication Critical patent/EP0024005A2/fr
Publication of EP0024005A3 publication Critical patent/EP0024005A3/de
Application granted granted Critical
Publication of EP0024005B1 publication Critical patent/EP0024005B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/08—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable
    • B30B11/10—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable intermittently rotated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses
    • B30B15/302—Feeding material in particulate or plastic state to moulding presses

Definitions

  • the invention relates to a method for dry pressing molded parts on automatic presses made of powdery substances with a flow behavior of more than 60 seconds per 100 g of powder, in which the powder by means of a filling device in its own working position in the die (filling space) of a pressing tool with a bottom - and upper stamps are filled in, pressed in another own working position and the finished molded parts are ejected in another own working position and in which the working positions are gradually exchanged cyclically.
  • the flow properties are characterized by the flow time when the powder flows from a 60 ° standard funnel with a nozzle opening of 4 mm and a nozzle length of 4 mm. The flow time is usually given in seconds per 100 g of powder. Free flowing powders have a flow duration of 20 seconds per 100 g powder. Starting powders with poorer flow properties are also often to be processed on PreBautomats.
  • the flow properties can be brought into a more flowable shape by the known granulation processes such as mechanical granulation, thermal granulation and by granulation additives or by spray drying. Even after the different granulation processes, different powders are poorly flowable with flow properties of more than 60 seconds per 100 g of powder.
  • the production of compacts from powdery materials on automatic presses is known for example from DE-PS 24 20 726.
  • the invention is therefore based on the object to improve the known methods so that it is possible to use powdery substances such as e.g. To process metal powder, ceramic powder, metal oxide powder or mixed powder of different components with a flow behavior of more than 60 seconds per 100 g powder on molding machines to form parts with small weight or mass tolerances.
  • powdery substances such as e.g. To process metal powder, ceramic powder, metal oxide powder or mixed powder of different components with a flow behavior of more than 60 seconds per 100 g powder on molding machines to form parts with small weight or mass tolerances.
  • the object is achieved in that the total filling level in the die is divided into at least two individual filling levels such that the filling to the individual filling levels is carried out at different filling positions.
  • An influencing variable when filling a mold is in addition to the size, e.g. of the diameter, also the ratio of height to diameter of the mold.
  • the method according to the invention is intended to press molded parts with a geometry that results from the predetermined ratio of fill height to diameter greater than 2.
  • the ratio fill height to wall thickness should be used for hollow parts.
  • the fill height / diameter or fill height / wall thickness ratio can be more than 10. wear.
  • Fig. 1 shows the arrangement of the pressing tools and the working positions for a division of four with the positions filling F1, filling F2, pressing P and ejecting A. on a multi-position press.
  • the circular parts 1 and 2 show the area for the chronological sequence of the filling processes 1 and 2.
  • the direction arrow 4 shows the direction of rotation of the press table.
  • Fig. 2 shows a schematic representation of the arrangement of the pressing tools and the working positions for a five division of the press table with three filling positions F1, F2 and F3 as well as a pressing position P and an ejection position A.
  • the circular parts 1, 2 and 3 show the area of the filling processes F1 , -F2 and F3.
  • the direction arrow 4 shows the direction of rotation of the press table.
  • the die volume is filled using filling devices.
  • a filling device e.g. a filling pot moved over the die opening can be used.
  • sloping sheets are usually arranged in the fill pot.
  • grid-shaped sheets are arranged on the bottom of the filling pot so that wedge effects are reduced when the filling pot is moved over the die opening or when the die is moved under the filling pot.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Arc Welding In General (AREA)
  • Drying Of Solid Materials (AREA)
  • Press Drives And Press Lines (AREA)
EP80104444A 1979-08-09 1980-07-28 Procédé pour presser à sec des articles moulés Expired EP0024005B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80104444T ATE7870T1 (de) 1979-08-09 1980-07-28 Verfahren zum trockenpressen von formteilen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792932420 DE2932420A1 (de) 1979-08-09 1979-08-09 Verfahren zum trockenpressen von formteilen
DE2932420 1979-08-09

Publications (3)

Publication Number Publication Date
EP0024005A2 true EP0024005A2 (fr) 1981-02-18
EP0024005A3 EP0024005A3 (en) 1981-07-15
EP0024005B1 EP0024005B1 (fr) 1984-06-13

Family

ID=6078101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80104444A Expired EP0024005B1 (fr) 1979-08-09 1980-07-28 Procédé pour presser à sec des articles moulés

Country Status (8)

Country Link
US (1) US4543223A (fr)
EP (1) EP0024005B1 (fr)
JP (1) JPS5630098A (fr)
AT (1) ATE7870T1 (fr)
DE (2) DE2932420A1 (fr)
ES (1) ES8103831A1 (fr)
GR (1) GR69844B (fr)
PT (1) PT71668B (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE563083C (de) * 1930-04-06 1932-11-01 Fritz Kilian Fa Geruettelte Fuellvorrichtung fuer Rundlaufpressmaschinen zur Herstellung von Tabletten und aehnlichen Presslingen, insbesondere fuer pharmazeutische Zwecke
US2970554A (en) * 1959-01-09 1961-02-07 Bristol Myers Co Tablet press
US3677674A (en) * 1971-03-09 1972-07-18 Nat Forge Co High production isostatic molding device
US4080128A (en) * 1974-04-29 1978-03-21 Siemens Aktiengesellschaft Apparatus for the production of compacts of layerwise different composition, for heavy duty electric contacts

Also Published As

Publication number Publication date
GR69844B (fr) 1982-07-19
ATE7870T1 (de) 1984-06-15
EP0024005A3 (en) 1981-07-15
JPS5630098A (en) 1981-03-26
EP0024005B1 (fr) 1984-06-13
US4543223A (en) 1985-09-24
ES494114A0 (es) 1981-03-16
DE2932420A1 (de) 1981-02-26
ES8103831A1 (es) 1981-03-16
PT71668A (de) 1980-09-01
DE3068196D1 (en) 1984-07-19
PT71668B (de) 1981-07-01

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