EP0174613B1 - Moule pour la fabrication de plaques de grille pour accumulateurs au plomb - Google Patents

Moule pour la fabrication de plaques de grille pour accumulateurs au plomb Download PDF

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Publication number
EP0174613B1
EP0174613B1 EP85111263A EP85111263A EP0174613B1 EP 0174613 B1 EP0174613 B1 EP 0174613B1 EP 85111263 A EP85111263 A EP 85111263A EP 85111263 A EP85111263 A EP 85111263A EP 0174613 B1 EP0174613 B1 EP 0174613B1
Authority
EP
European Patent Office
Prior art keywords
thermal conductivity
mold
mould
grid
lead
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.)
Expired
Application number
EP85111263A
Other languages
German (de)
English (en)
Other versions
EP0174613A1 (fr
Inventor
Hans-Joachim Dr. Dipl.-Ing. Golz
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.)
VARTA Batterie AG
Original Assignee
VARTA Batterie 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 VARTA Batterie AG filed Critical VARTA Batterie AG
Priority to AT85111263T priority Critical patent/ATE33461T1/de
Publication of EP0174613A1 publication Critical patent/EP0174613A1/fr
Application granted granted Critical
Publication of EP0174613B1 publication Critical patent/EP0174613B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
    • B22D25/04—Casting metal electric battery plates or the like

Definitions

  • the invention relates to a casting mold from two mold halves for the production of grid plates for lead accumulators, in particular starter grids, which in addition to thin grid ribs and webs have thicker frames and plate flags (DE-C-1 155 833).
  • Lattice molds for starter battery grids are generally made from cast iron. They are held in a hinged mold carrier or mold clamping block, and each mold half can be replaced in it.
  • the mold carriers are provided with a number of cooling channels, if possible in a distribution in which highly overheated surfaces are also exposed to particularly effective cooling.
  • the mold coating consists of all three components. Its primary purpose is insulation by preventing the lead from adhering to the mold and thus acting as a highly effective release agent. It also enables the air in the mold cavity to escape at least over short distances and through pore spaces that are not filled by the lead to the nearest ventilation openings.
  • the coating forms a thermal cushion towards the relatively good heat-conducting mold material and ensures that the poured-in liquid lead does not solidify prematurely, but rather can fill the mold cavity exactly.
  • the necessary constant renewal of the powder layer which is carried out by means of a compressed air atomizer, means that after a whole series of applications, precisely at the places of the shape which form the flags and frames, the heat removal from the molten lead takes place disproportionately much more slowly than from the filigree of the lattice webs with its low accumulation of material, so that one had begun to scrape off the remaining layer at the points mentioned before each new dusting of the mold, so as to make contact with the good heat-conducting mold material closer.
  • each of the two one-piece mold halves has a central part with depressions corresponding to the grid ribs and webs and an edge part with a plate edge has a corresponding larger groove, the edge parts being in direct heat-conducting connection with the associated mold carrier halves, but the central parts being offset against the mold carrier by an air gap.
  • the heat flow out of the thin lattice is delayed by the insulating air pockets formed in this way.
  • the invention has for its object to provide a mold for grid plates, which makes it possible to adjust the different cooling speeds of the frame and the latticework so that a faster workflow is possible after avoiding annoying post-treatment after each casting process or other measures associated with wasted time.
  • An essential idea of the invention is thus the accelerated dissipation of the disproportionately high heat content of the lead melt in the mold cavities corresponding to the flags and plate frames, which is not possible by enlarging the mold cavity surface, with the aid of a mold material that is more thermally conductive and actively supported in this property by a coolant.
  • the base material of the casting mold which usually consists of gray cast iron or certain steel alloys, is replaced according to the invention at the material accumulation points of the casting by a material with a higher specific thermal conductivity.
  • z. B. copper whose thermal conductivity is 384 W / m - K compared to 58 W / m - K for gray cast iron.
  • Aluminum behaves somewhat less favorably with a thermal conductivity of 204 W / m - K, which is further reduced for aluminum alloys down to about 172 W / m - K.
  • a particularly advantageous embodiment of a lattice mold according to the invention is if the thermal conductivity of the better heat-conducting material to the thermal conductivity of the mold base material is approximately in the same ratio as the area-related lead volume at the plate thickening to the area-related lead volume in the area of the actual grid.
  • the purpose according to the invention can also be achieved by a targeted cross-sectional design of the molded parts made of the better heat-conducting material, by designing the cross-section in accordance with its specific thermal conductivity so that the achievable heat outflow by the ratio of the area-related lead volume at the plate thickenings to the area-related Lead volume in the actual grid area is increased.
  • the effectiveness of the thermal bridges only comes into its own when it is thermally connected at the rear as close as possible to a channel through which a cooling medium flows, because the temperature factor contained in the dimension of the thermal conductivity inevitably has an even greater influence, depending on the temperature difference is greater.
  • Water or oil is generally used as the cooling medium.
  • the inserts will be conveniently inserted in the required places before the mold is engraved. There may be rotationally symmetrical parts in the area of the flags, since these are the easiest to manufacture and fit. In the area of the frames, there will have to be strips that may have stems that are not too far apart, which in turn lead to the cooling channels.
  • the dimensioning of the thermal bridges has to be carried out individually from grid to grid in order to achieve the goal of simultaneous cooling with different grid constructions.
  • the figure shows a lattice casting mold 1, in which the base material of the mold is replaced by an insert 2 of higher thermal conductivity with the contours of the flag 3 and the frame 4 in areas of larger accumulations of molten lead.
  • the arrows indicate the direction of the molten lead.
  • the better heat-conducting inserts are closely adjacent, the cooling water channels 5 are arranged.
  • vents 6 are embedded in the mold surface, at the same time integrated in their engraving. These are inserts similar to the thermal bridges according to the invention, but consist of the same basic material as the shape and allow the air compressed in front of the inflowing lead in the web grooves to escape via the capillary joints 7 into the ventilation channel 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Vibration Dampers (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (3)

1. Moule constitué de deux demi-moules pour la fabrication de plaques de grilles pour accumulateurs au plomb, en particulier de grilles de démarrage, qui, outre des cannelures et des nervures fines, présentent des cadres et des queues de plaques plus épais, caractérisé en ce que, dans la zone des accumulations de matière de la grille telles que les cadres (4) et les queues (3), le moule est constitué par des parties (2) en une matière qui possède une conductibilité thermique spécifique plus élevée que celle de la matière de base du moule, et en ce qu'au moins un canal (5) parcouru par un agent réfrigérant est disposé si possible près des parties meilleures conductrices thermiques du moule.
2. Moule selon la revendication 1, caractérisé en ce que le rapport de la conductibilité thermique de la matière meilleure conductrice thermique à la conductibilité thermique de la matière de base du moule est à peu près le même que celui du volume de plomb rapporté à la surface au niveau des épaississements (3, 4) de la plaque au volume de plomb rapporté à la surface dans la zone de la grille elle-même (2).
3. Moule selon la revendication 1, caractérisé en ce que les parties du moule en la matière meilleure conductrice thermique sont dimensionnées en ce qui concerne leur section transversale, selon la conductibilité thermique spécifique de cette matière, de telle façon que l'élimination de la chaleur qui peut être atteinte est augmentée dans le rapport du volume de plomb rapporté à la surface au niveau des épaississements (3, 4) de la plaque au volume de plomb rapporté à la surface dans la zone de la grille elle-même (2).
EP85111263A 1984-09-13 1985-09-06 Moule pour la fabrication de plaques de grille pour accumulateurs au plomb Expired EP0174613B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85111263T ATE33461T1 (de) 1984-09-13 1985-09-06 Giessform zur herstellung von gitterplatten fuer bleiakkumulatoren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3433583 1984-09-13
DE19843433583 DE3433583A1 (de) 1984-09-13 1984-09-13 Giessform zur herstellung von gitterplatten fuer bleiakkumulatoren

Publications (2)

Publication Number Publication Date
EP0174613A1 EP0174613A1 (fr) 1986-03-19
EP0174613B1 true EP0174613B1 (fr) 1988-04-13

Family

ID=6245276

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85111263A Expired EP0174613B1 (fr) 1984-09-13 1985-09-06 Moule pour la fabrication de plaques de grille pour accumulateurs au plomb

Country Status (8)

Country Link
US (1) US4733849A (fr)
EP (1) EP0174613B1 (fr)
AT (1) ATE33461T1 (fr)
CA (1) CA1234475A (fr)
DE (2) DE3433583A1 (fr)
ES (1) ES288714Y (fr)
FI (1) FI80839C (fr)
NO (1) NO164886C (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE160529T1 (de) * 1991-08-02 1997-12-15 Canon Kk Spritzgiessform aus metall und verwendung derselben zum spritzgiessen eines körpers
DE4224078A1 (de) * 1992-07-21 1994-01-27 Hagen Batterie Ag Gittergießform zum Gießen von Akkumulatoren-Bleigittern und Verfahren zu deren Herstellung
DE19819007A1 (de) * 1998-04-28 1999-11-04 Jonathan Aerospace Materials E Vorrichtung und Verfahren zum Gießen von dreidimensional strukturierten Gegenständen

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1652445A (en) * 1925-08-22 1927-12-13 Harry S Lee Heat control in castings
GB330018A (en) * 1929-03-11 1930-06-05 Ig Farbenindustrie Ag Improvements in moulds for the manufacture of castings from metals or alloys
US1994634A (en) * 1934-04-19 1935-03-19 New Jersey Zinc Co Method of casting stereotype plates
US2194092A (en) * 1937-12-23 1940-03-19 Solar Corp Mold for battery grid plates
US2807065A (en) * 1956-10-12 1957-09-24 Anaconda Co Mold insert block
DE1155833B (de) * 1957-11-27 1963-10-17 Winkel Machine Company Inc Giessform aus zwei Formhaelften fuer Gitter von Platten fuer Akkumulatoren
GB1402099A (en) * 1971-12-15 1975-08-06 Lucas Batteries Ltd Battery plate grids for lead-acid batteries
JPS5666372A (en) * 1979-10-30 1981-06-04 Shin Kobe Electric Mach Co Ltd Die for lead alloy casting
JPS56114552A (en) * 1980-02-13 1981-09-09 Hitachi Metals Ltd Metal mold for casting

Also Published As

Publication number Publication date
CA1234475A (fr) 1988-03-29
DE3562117D1 (en) 1988-05-19
DE3433583A1 (de) 1986-03-20
FI853471A0 (fi) 1985-09-11
ES288714U (es) 1986-01-16
NO164886B (no) 1990-08-20
FI80839B (fi) 1990-04-30
NO164886C (no) 1990-11-28
US4733849A (en) 1988-03-29
FI853471L (fi) 1986-03-14
ES288714Y (es) 1986-10-01
ATE33461T1 (de) 1988-04-15
NO853579L (no) 1986-03-14
EP0174613A1 (fr) 1986-03-19
FI80839C (fi) 1990-08-10

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