US2669760A - Die or press casting machine - Google Patents

Die or press casting machine Download PDF

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Publication number
US2669760A
US2669760A US222859A US22285951A US2669760A US 2669760 A US2669760 A US 2669760A US 222859 A US222859 A US 222859A US 22285951 A US22285951 A US 22285951A US 2669760 A US2669760 A US 2669760A
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United States
Prior art keywords
piston
press
counter
chamber
pressure
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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 - Lifetime
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US222859A
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English (en)
Inventor
Venus Wilibald
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.)
Hahn and Kolb GmbH and Co
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Hahn and Kolb GmbH and Co
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.)
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Publication date
Application filed by Hahn and Kolb GmbH and Co filed Critical Hahn and Kolb GmbH and Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
    • B22D17/12—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with vertical press motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/32—Controlling equipment

Definitions

  • press casting machines with unheated press chambers and press moulds attached laterally thereto are known, in which the press pistons serve as ejectors for the press residues and there are provided as the bases of the press chambers counter-pistons which act as control slides for the nozzle mouths leading to the press moulds.
  • Removable abutments are usually provided for the counter-piston, against which the piston bears during the injection stroke. Removal of these abutments, which must necessarily take place for ejecting the casting residue from the path of movement of the counmr-piston, also involves great diffioulty.
  • a press chamber must necessarily be in the form of a cylinder open at one end only, which not only necessitates a difficult and expensive manufacture, but is also diiiicult of access when fitting or removing the counter-piston.
  • a die or press casting machine including or comprising an unheated tubular press chamher, having one or more press moulds laterally connected thereto, a press piston also serving as the eject-or for the press residue, and a counterpiston, which counter-piston forms the base of 2 the tubular press chamber andL acts as the control slide for one or more nozzle mouths leading to the press moulds when in its inner end position located within the press chamber, in which the counter-piston, in its said inner end position, may be protected against longitudinal displacement by controllable supporting means, but can be axially rotated in the manner of a rotary control slide for the purpose or opening the nozzle mouth and which is longitudinally displaceable in the direction of the press stroke into its outer end position only after the release of said supporting means.
  • the rotary movement of the counter-piston is preferably positively coupled with the press stroke of the press piston in such a manner that this rotary movement occurs di rectly before the impinging of the press piston upon the casting material.
  • controllable supporting means for the counter-piston is a hydraulic piston, which can be loaded against the direction of the press stroke in such a manner that it does not yield to the pressure exerted by the press piston on its press stroke, until termination of the casting process, and which is only displaced after the filling of the mould.
  • This displacement is advantageously such that the counter-piston supported by the hydraulic piston can be displaced longitudinally in the direction of the press stroke into an extreme position located outside the press chamber.
  • FIG. 1 shows a vertical section through a press casting machine, according to the present invention, the details of the hydraulic plant being shown diagrammatically,
  • Fig. 2 is a horizontal section, substantially on the line II--II in Fig. 1, and
  • Fig. 3 is an oblique view of the head of a counter-piston for a press casting machine, according to the invention.
  • i is a hydraulic pressure accumulator to the outlet of which is connected a pressure pipe 2 which leads to a working chamber 3 of a cylinder 4 in which. may reciprocate a double-acting press piston 5.
  • a pipe 6 leads via an adjustable throttle l to a working chamber 8 of an auxiliary double-acting piston 9 reciprocable in a cylinder till.
  • Hi is a cylindrical press chamber and H is a counter-piston which forms the base of the press chamber i8. Projecting from the counter-piston H is a substantially radially outwardly directed lever i 2 which, in the position shown, bears under the influence of a spring it, against a stop it. The lever i2 is located in the movement path of the auxiliary piston ii when the counter-piston is at its upper end position as illustrated.
  • the head of the counter-piston l I bears a recess 15, as can best be seen from Fig. 3.
  • the recess 15 When the counter-piston l l occupies its upper end position within the press chamber it the recess 15 is located at the same level as a nozzle mouth it (see Fig. 1). Nevertheless, in this position the recess 15 is not adjacent to the nozzle opening it.- This may be most clearly appreciated from Fig. 2 in which a dotted line Ida indicates the position of the recess l5. Connection between the nozzle mouth is and the recess it occurs only ifthe lever it is displaced in the arrow direction 23 against the action of the spring 13, and the counter-piston ii is at its upper end position as shown.
  • the high pressure pipe I! leads via pipes it, it to two control devices generally indicated at 2B and 25.
  • the control device is so adjusted that pressure fluid can pass via a pipe 22 to a return stroke chamber 23 of the cylinder 4 and from there via a pipe 24 and an adjustable throttle 25 to a return stroke chamber 125 of the auxiliary piston 9.
  • the pressure in the network I], I8, 22, 23 and therefore the pressure on the return stroke face of the press piston 5, is so selected in relation to the pressure on.
  • in the position shown of its control slide 3
  • a mould closing piston 33 is disposed in the closing cylinder 3d, and the shaft of this piston 3t carries a movable half 38 of a casting mould 39, all.
  • the stationary half 46 of the mould is laterally connected via the nozzle mouth It to the tubular press chamber iil.
  • the right-hand end position shown of the closing piston 38 corresponds to the closed position of the casting mould 559. MB.
  • a supporting piston ill onto the shaft of which is located at 42 the counter-piston l l, which is axially rotatable relative to the supporting piston but is not longitudinally displaceable relative thereto.
  • the pressure which may be exerted from the high pressure pipe H in the working chamber 35 upon the comparatively large lower face of the supporting piston ii is substantially greater than the pressure exerted from the pressure accumulator lv upon the upper face press piston 5 in its press stroke direction 33.
  • the return stroke chambers 45, 45 for. the return strokes of the two pistons 38, a: are connected to the control device 2i by Way of pipesv it, 47.
  • the return stroke chambers 44, 45 are in connection with a pressure-less discharge pipe 48. If the control slide 3i is moved to the right out of the position shown, the discharge pipe 48 is cut off. Further, the supply pipes I1, [9 for pressure fluid to the pipes 45, 47 is opened, and the work chambers til, 35 of the closing cylinder 36 and of the supporting cylinder. 31' are connected with a pressure-less liquid discharge pipe. 59. In this case, the supporting piston 4
  • the return stroke faces in, the annular return stroke chambers s4, 45 are so di mensioned inv relation to the piston faces facing the working chambers 35 that at first the supporting piston 41 movement and only after that does the closing piston 38 perform its stroke movement to open the casting mould 35, :28.
  • the press casting machine with its control de-- vices it, it is located in the position shown When molten casting material is charged into the press chamber ii).
  • the counter-piston H which, in its upper end position, projects into the press chamber l9, cuts 01? in the manner of a rotary control slide the nozzle mouth It leadingto the mould 39, d0.
  • the slide 30 of the control device 29 is moved to the right.
  • the pipe 22 is then connected with the discharge pipe 29 whereby relieving the pressure in the return stroke chamber 23, and also, by way of the throttle 25, relieving the pressure in the return stroke chamber 26 of the auxiliary piston 9.
  • the pressure accumulator l is now able to move the press piston 5 downwards and also to move the auxiliary piston 9 to the right via the throttle 1.
  • the throttle l is so proportioned or adjusted that the auxiliary piston B bears against the lever 12. and thereby rotates the counter-piston H in time relation to the working stroke of the press piston 5, such that the recess 15 abuts the 1102-.
  • the press chamber is open at both ends and easily accessible for cleaning.
  • the auxiliary piston 9 is moved back into its initial position, also against the pressure exerted by the accumulator Now after the work piece, together with the metal residue lodged in the nozzle spring i6, is removed from the casting mould 39, 43, the control slide 35, of the control device 2
  • the mould 39, 40 now closes under the pressure in the working chamber 34 and the counterpiston moves under the pressure in the work ing chamber 35 into its upper end position, so that its head is located within the press chamber Hi. This position is shown in the drawings.
  • the lever l2 here moves upwards with the piston, and is held by the action of the spring [3 against the stop M.
  • the auxiliary piston 9 is already in its left hand end position, so the movement of the lever is not hindered thereby.
  • the casting residue is ejected from the press chamber by the shortest route and with the minimum of friction and at the same time, the movement which leads to the release of the nozzle opening is derived in simple, reliable manner from the driving network of the machine without having to revert to movement of a closing organ in the manner of a rotary or slide control by resilient means, itself disposed within the filling chamber which method, as practical. experience shows, is uncertain in operation.
  • a die or press casting machine comprising an unheated open-ended cylindrical press chamber, at least one mold laterally connected thereto, a press piston and cylinder, a counter-piston reciprocating within the press chamber, said pistons being adapted to extend from opposite ends into said press chamber, means including a supporting piston connected to the counter-piston to axially adjust the counter-piston in two opposite end positions, in the lower position of which the counter-piston will be clear of the press chamber and permit the press piston to follow it below the press chamber and thereby to act as a casting material residue ejector, the upper end position being such as to form the bottom of the press 5 chamber, the upper end of the counter-piston having at least one lateral recess therein, and means connected to the press piston cylinder for rotating the counter-piston in its upper end position to bring the recess into alignment with the respective mold in which position of the recess the press piston may effect an injection of casting material from the press chamber into said mold, said last-mentioned means including
  • a die or press casting machine comprising an unheated open-ended cylindrical press chamber, at least one mold laterally connected thereto, a press piston and cylinder, a counter-piston reciprocating with the press chamber, said pistons being adapted to extend from opposite ends into said press chamber, means including a supporting piston connected to the counter-piston to axially adjust the counter-piston in two opposite end.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
US222859A 1950-05-04 1951-04-25 Die or press casting machine Expired - Lifetime US2669760A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH2655A DE833245C (de) 1950-05-04 1950-05-04 Spritz- oder Pressgiessmaschinen

Publications (1)

Publication Number Publication Date
US2669760A true US2669760A (en) 1954-02-23

Family

ID=7143172

Family Applications (1)

Application Number Title Priority Date Filing Date
US222859A Expired - Lifetime US2669760A (en) 1950-05-04 1951-04-25 Die or press casting machine

Country Status (5)

Country Link
US (1) US2669760A (de)
CH (1) CH284146A (de)
DE (1) DE833245C (de)
FR (1) FR1040705A (de)
GB (1) GB683751A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2893082A (en) * 1957-04-29 1959-07-07 Hodler Fritz Device for increasing the capacity of die casting machines
US3038220A (en) * 1956-03-23 1962-06-12 Renault Pressure diecasting machine
WO1994002271A1 (en) * 1992-07-23 1994-02-03 Hi-Tec Metals Limited A moulding device
GB2283445A (en) * 1992-07-23 1995-05-10 Hi Tec Metals Ltd A moulding device
US5611387A (en) * 1992-07-23 1997-03-18 Hi-Tec Metals Limited Moulding device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1717254A (en) * 1927-09-01 1929-06-11 Polak Josef Casting machine
DE539817C (de) * 1930-04-25 1931-12-02 Josef Polak Durch Kolbendruck wirkende Giessmaschine
US1958199A (en) * 1932-02-16 1934-05-08 Doehler Die Casting Co Die-casting machine
US1983303A (en) * 1930-08-14 1934-12-04 William G Newton Casting machine
US2018566A (en) * 1932-10-21 1935-10-22 Nyselius Gustav Casting machine
US2137764A (en) * 1936-03-19 1938-11-22 Wagner Karl Friedrich Apparatus for casting metal under pressure
US2519739A (en) * 1946-09-04 1950-08-22 Hydropress Inc Die-casting machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1717254A (en) * 1927-09-01 1929-06-11 Polak Josef Casting machine
DE539817C (de) * 1930-04-25 1931-12-02 Josef Polak Durch Kolbendruck wirkende Giessmaschine
US1983303A (en) * 1930-08-14 1934-12-04 William G Newton Casting machine
US1958199A (en) * 1932-02-16 1934-05-08 Doehler Die Casting Co Die-casting machine
US2018566A (en) * 1932-10-21 1935-10-22 Nyselius Gustav Casting machine
US2137764A (en) * 1936-03-19 1938-11-22 Wagner Karl Friedrich Apparatus for casting metal under pressure
US2519739A (en) * 1946-09-04 1950-08-22 Hydropress Inc Die-casting machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3038220A (en) * 1956-03-23 1962-06-12 Renault Pressure diecasting machine
US2893082A (en) * 1957-04-29 1959-07-07 Hodler Fritz Device for increasing the capacity of die casting machines
WO1994002271A1 (en) * 1992-07-23 1994-02-03 Hi-Tec Metals Limited A moulding device
GB2283445A (en) * 1992-07-23 1995-05-10 Hi Tec Metals Ltd A moulding device
GB2283445B (en) * 1992-07-23 1996-03-06 Hi Tec Metals Ltd A moulding device
US5611387A (en) * 1992-07-23 1997-03-18 Hi-Tec Metals Limited Moulding device

Also Published As

Publication number Publication date
DE833245C (de) 1952-03-06
GB683751A (en) 1952-12-03
FR1040705A (fr) 1953-10-19
CH284146A (de) 1952-07-15

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