EP2862647A1 - Piston à coulée sous pression - Google Patents

Piston à coulée sous pression Download PDF

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Publication number
EP2862647A1
EP2862647A1 EP20140003296 EP14003296A EP2862647A1 EP 2862647 A1 EP2862647 A1 EP 2862647A1 EP 20140003296 EP20140003296 EP 20140003296 EP 14003296 A EP14003296 A EP 14003296A EP 2862647 A1 EP2862647 A1 EP 2862647A1
Authority
EP
European Patent Office
Prior art keywords
base body
face
die
end ring
lateral surface
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
EP20140003296
Other languages
German (de)
English (en)
Other versions
EP2862647B1 (fr
Inventor
Gabriel Vida
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.)
Wieland Werke AG
Original Assignee
Wieland Werke 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 Wieland Werke AG filed Critical Wieland Werke AG
Publication of EP2862647A1 publication Critical patent/EP2862647A1/fr
Application granted granted Critical
Publication of EP2862647B1 publication Critical patent/EP2862647B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/203—Injection pistons
    • 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
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2038—Heating, cooling or lubricating the injection unit

Definitions

  • the invention relates to a pressure casting piston with a base body which can be fastened to a piston rod according to the preamble of claim 1.
  • a die-cast piston head for light metal die-casting which comprises a one-piece piston head of copper or a copper alloy and a piston head arranged on the closed wear ring of a harder material than that of the piston head.
  • the wear ring is arranged in the region between the end face and the lateral surface of the piston head.
  • the wear ring has a web which points radially inwards and faces the radially inwardly directed edge on its end face. This bridge forms a barrier to protect the Joint between the piston head and the wear ring against penetration of the molten metal, since the extension of the invention and multiple deflection of the penetrating into the joint metal solidifies near the end face.
  • a plunger for cold chamber die casting machines which has a piston head and a fixedly connected to this piston rod.
  • a cooling system is formed with a plurality of cooling channels.
  • On the front side a flat top plate is arranged on the sleeve, which is fixed by means of screws from the front on the end face of the piston head. The top plate lies flat on the front end of the sleeve, whereby the end face of the plunger also forms an abutment for absorbing the forces during pressing.
  • the invention has the object of developing a die-casting piston in terms of ease of maintenance and functionality.
  • the invention includes a Druckg screenkolben with a fastened to a piston rod body with a melt-side end face on the lateral surface at least a hollow cylindrical slider and optionally a stripping element can be mounted, and a closed end ring between the end face of the body and the end face of the slider is arranged the end ring is fastened by means of a connecting device on the base body.
  • the closed end ring is axially over the end face of the base body mounted on the lateral surface of the base body and there lockable and releasable by means of the connecting means there.
  • the closed end ring serves as a front-side first retaining element for the hollow cylindrical sliding body and the stripping element.
  • Such die-casting pistons are suitable both for use in vacuum die casting machines as well as for other designs. Consequently, the locking mechanism of the connecting device acts over the lateral surface of the main body.
  • a special design principle is used, which makes it possible to produce an interlocking operative connection of the end ring over the lateral surface of the base body, for example, from easily accessible locations on the diecasting piston.
  • Such connecting devices represent, for example, independent fixings with several individual parts.
  • a connecting device is also releasable and suitable for releasing the end ring again.
  • locking mechanisms which are accessible in particular from the end face or from the piston rear side are suitable.
  • the invention is based on the consideration that the wearing parts can be replaced from the front side.
  • the hollow cylindrical sliding body in the form of sliding bushes and / or expansion rings and possibly the stripping in the form of one or more scraper rings on the piston head pushed onto the lateral surface of the body and secured with a front end final ring.
  • An actuating mechanism for fixing and releasing the connection of the end ring and the base body can preferably take place from the end face of the piston either axially or radially or also from the piston rear side in the axial direction.
  • Mechanical closures can constructively to a Quick-release closure of drill chucks or, for example, be based on a pin lock.
  • the entire structure for mounting is adapted to that any arranged in the body direct or indirect cooling devices are not affected in their effect. Consequently, the securing mechanism of the first holding element, depending on the piston size, designed according to the available space.
  • the end ring usually does not overlap or only slightly on the end face of the body. Thus, desirably, only the face of the body is significantly exposed to the temperature of the melt. There, the piston cooling can act efficiently by a suitable selection of materials.
  • the first holding element may be arranged as a ring made of a harder material than that of the sliding body.
  • a ring made of a harder material such as copper or a copper alloy.
  • the main body can be made of steel or copper.
  • a base made of copper offers advantages in terms of cycle times of the die casting machine due to the better heat dissipation, especially in aluminum die-casting. Steel base bodies have the advantage that they are more robust, so have a longer service life.
  • the slider can be made of steel.
  • the particular advantage is that wearing parts from the front, so from the piston end side, can be replaced.
  • sliding bushes, expansion rings and scraper rings are pushed over the piston head and secured with the end ring as the first holding element.
  • the hollow cylindrical sliding body and the scraper element can be fixed on the side facing away from the end face of the base body by a second holding element.
  • the second Retaining element can be integral part of the body.
  • the second holding element may also be a further ring, which is firmly connected to the base body, for example in a groove. In its radial extent, the second holding element is equal to or smaller than the other sliding bushes, expansion rings or scraper rings. In any case, the retaining element does not project beyond its circumference.
  • the second retaining element may be at least one protrusion emerging from the lateral surface of the base body.
  • the projection must be such that in each case the axial forces of the other sliding bodies or scraper rings occurring during operation can be absorbed.
  • the second holding element is designed as a circumferential circumferential projection of the circumferential surface of the body.
  • the second holding element serves as a rear stop or flange on which a front side of the adjacent rings lies flat.
  • Such a projection can also be easily formed from the relatively massive base body in the production.
  • the connecting device can generate a force acting on the closed end ring and the hollow cylindrical slider axial bias.
  • a bias By a bias, the sliding body, expansion rings or scraper rings in the axial direction no play and are pressed against each other frontally. As a result, the undesired penetration of residual melt between the respective end faces is effectively prevented in operation. The axial thermal expansion of the materials is compensated.
  • the connecting device can be a bayonet lock, a clamping nut, a mechanical, an electromechanical, a mechatronic or a magnetic lock.
  • Mechanical locks comprise movable segments, for example a combination of pins and springs, which are formed on the front side depending on the available space as brackets. In most cases, components that are complementary to one another are positioned, which interact with the closure mechanism. Further, consisting of several active principles, functional locking units, such as electromechanical or mechatronic locks, are being considered.
  • the closed end ring can be chamfered or otherwise chamfered when viewed from the end face of the base body.
  • a guide of the die-cast piston is effected in the die-cast chamber.
  • beveled edges at the transition from the end face to the lateral surface of the piston resistant to edge breakouts due to mechanical influences.
  • At least the end ring and the immediately adjacent hollow cylindrical sliding body at the respective end joints have complementary paragraphs, which interlock overlapping.
  • the rings are interlocked at their joints after assembly in the axial direction.
  • a mutual rotation of the rings can be made.
  • the die-casting piston 1 with direct cooling has a base body 2, which also forms the melt-side end face 22 of the die-casting piston 1.
  • a sliding bushing is arranged as a sliding body 3 and a scraper ring 5.
  • a closed end ring 6 is arranged on the lateral surface 21 as a first holding element, which usually consists of a harder material than the sliding body 3.
  • the sliding body 3 is characterized by a direct contact protected with the hot casting material.
  • a connecting device 8 For holding the closed end ring 6 is a connecting device 8, which serves as a closure and is detachable again.
  • the connecting device 8 which is simulated in the present embodiment, in principle, the locking mechanism of a pin lock, consists of a compression spring 81 with a pin 82.
  • the pin 82 is urged by the compression spring 81 to radially in a groove 61 in the first support member. 6 intervene.
  • the pin 82 is held permanently in the closing position.
  • a screw 84 is introduced from the end face 22 into the base body 2 through a bore, whose tip engages eccentrically in a recess 83 of the pin 82 so that the connection with the closed end ring 6 are released can.
  • the tip of the screw 84 is conical and the recess 83 complementary thereto as a hollow cone.
  • the arranged on the back of the slider 3 scraper ring 5 may be slotted and thus act as a sealing ring. In addition, it protects the slider 3 during retraction of the die-casting piston 1 against damage by in the filling chamber baked melt.
  • a protruding out of the main body protrusion 7 is arranged at the piston back end of the lateral surface 21, which fixes the scraper ring 5 and the slider 3 as the rear flange.
  • Fig. 2 shows an axial longitudinal section through a die-casting piston 1 by analogy Fig. 1
  • the screw 84 is passed as a release device from the piston rear side through a bore in the base body 2 and engages again in a center of a recess 83 of the pin 82 a.
  • the screw 84 usually has a screw thread.
  • other axially acting feed devices can be used. This also includes a bayonet lock.
  • Fig. 3 shows an axial longitudinal section through a vacuum pressure casting piston 1 with indirect cooling in the interior of the main body 2.
  • the connecting device 8 is again formed by means of a guided through the base body 2 from the back screw 84 for releasing the connection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP14003296.2A 2013-10-17 2014-09-24 Piston à coulée sous pression Active EP2862647B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013017261.6A DE102013017261B4 (de) 2013-10-17 2013-10-17 Druckgießkolben

Publications (2)

Publication Number Publication Date
EP2862647A1 true EP2862647A1 (fr) 2015-04-22
EP2862647B1 EP2862647B1 (fr) 2017-07-12

Family

ID=51618961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14003296.2A Active EP2862647B1 (fr) 2013-10-17 2014-09-24 Piston à coulée sous pression

Country Status (2)

Country Link
EP (1) EP2862647B1 (fr)
DE (1) DE102013017261B4 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017003693B3 (de) 2017-04-15 2018-06-14 Wieland-Werke Ag Druckgießkolben
WO2018119517A1 (fr) * 2016-12-30 2018-07-05 Exco Technologies Limited Piston de coulée sous pression, et appareil de coulée sous pression incorporant ce dernier

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015224414A1 (de) * 2015-12-07 2017-06-08 Volkswagen Aktiengesellschaft Gusseinrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19938076A1 (de) 1999-08-12 2001-02-15 Munderkinger Industrievertretu Preßkolben
DE10040578C1 (de) 2000-08-18 2001-10-25 Kunz Susanne Druckgießkolben, insbesondere für Vakuum-Druckgießmaschinen
DE102005048717A1 (de) * 2005-10-12 2007-04-19 Allper Ag Mehrteiliger Kolben für eine Kaltkammer-Giessmaschine
DE102011052446A1 (de) 2011-08-05 2013-02-07 Schmelzmetall Ag Druckgusskolbenkopf

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19938076A1 (de) 1999-08-12 2001-02-15 Munderkinger Industrievertretu Preßkolben
DE10040578C1 (de) 2000-08-18 2001-10-25 Kunz Susanne Druckgießkolben, insbesondere für Vakuum-Druckgießmaschinen
DE102005048717A1 (de) * 2005-10-12 2007-04-19 Allper Ag Mehrteiliger Kolben für eine Kaltkammer-Giessmaschine
DE102011052446A1 (de) 2011-08-05 2013-02-07 Schmelzmetall Ag Druckgusskolbenkopf

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018119517A1 (fr) * 2016-12-30 2018-07-05 Exco Technologies Limited Piston de coulée sous pression, et appareil de coulée sous pression incorporant ce dernier
DE102017003693B3 (de) 2017-04-15 2018-06-14 Wieland-Werke Ag Druckgießkolben
EP3388167A1 (fr) * 2017-04-15 2018-10-17 Wieland-Werke AG Piston de coulée sous pression
US10376953B2 (en) 2017-04-15 2019-08-13 Wieland-Werke Ag Die-casting piston

Also Published As

Publication number Publication date
DE102013017261B4 (de) 2017-09-28
DE102013017261A1 (de) 2015-04-23
EP2862647B1 (fr) 2017-07-12

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