EP0116906A1 - Piston pour machines à couler sous pression - Google Patents

Piston pour machines à couler sous pression Download PDF

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Publication number
EP0116906A1
EP0116906A1 EP84101330A EP84101330A EP0116906A1 EP 0116906 A1 EP0116906 A1 EP 0116906A1 EP 84101330 A EP84101330 A EP 84101330A EP 84101330 A EP84101330 A EP 84101330A EP 0116906 A1 EP0116906 A1 EP 0116906A1
Authority
EP
European Patent Office
Prior art keywords
piston
mouthpiece
end wall
casting
supply pipe
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.)
Withdrawn
Application number
EP84101330A
Other languages
German (de)
English (en)
Inventor
Friedrich Glas
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0116906A1 publication Critical patent/EP0116906A1/fr
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the invention relates to a casting piston for die casting machines, which is fastened to a hollow piston rod, in which a coolant supply pipe axially projecting over the piston rod is arranged at radial spacing and protrudes into a tubular body which delimits an annular space with the piston jacket, which on the one hand at the piston ends communicates with the front opening of the coolant supply pipe and on the other hand with the return flow channel formed between the coolant supply pipe and the piston rod.
  • Such a casting piston is known from DE-A-22 33 132. It is made up of several parts.
  • the front wall merges in one piece into the tubular body.
  • the communication for the coolant takes place via a front and a rear narrow radial channel.
  • the coolant throughput and thus the cooling effect are low. Add to this that the narrow R adialkanäle narrow lime deposits in operation, so that the cooling in the course of operation is even worse.
  • US-A-43 34 575 shows a casting plunger without any tubular body for forced guidance of the coolant.
  • the coolant supply pipe opens freely inside the piston. This eliminates the risk of clogging but also worsens the cooling because flow dead zones occur and the coolant can flow directly back into the return flow channel after it has left the coolant supply pipe.
  • the object of the invention is to improve a casting piston of the type mentioned in such a way that the heat transfer from the piston to the coolant, in particular in the region of the front piston end wall, is increased by influencing the coolant flow in the piston.
  • the tubular body is designed as a mouthpiece fully flowed around by the coolant, which is held in the piston by means of fewer holding members, which do not or not significantly obstruct the flow, at a distance from the front piston end wall in such a way that between the mouthpiece and a fluid chamber is formed in the front piston end wall which, apart from any holding members which may be provided, communicates with the annular space over its entire circumference.
  • the flow pattern here is a rotationally symmetrical source or stagnation point flow, which cools the piston end wall highly effectively while avoiding any flow dead zones.
  • the piston end wall can be made of thermally highly resilient material and nevertheless gives the casting piston a longer service life.
  • the mouthpiece can form a rigid structural unit by means of radial ribs with the front piston end wall, can also be fastened to the front end of the coolant supply pipe in the case of larger pistons and can be suspended in an axially adjustable manner, in particular as a separate component, by radial or axial support in the piston.
  • the parts belonging to the die casting machine are shown in dash-dotted lines, namely the front end of a piston rod 10 with an external thread 12 and a cylindrical bore 14, and a coolant supply pipe 16 which projects beyond the front end of the piston rod 10.
  • the cooling water flows into the casting piston, generally designated 18. In the annular space between the bore 14 and the cooling water supply pipe 16, the cooling water flows back again.
  • the casting piston 18 consists essentially of a Front piston end wall 20 with an external hexagon opening 30, a rear piston end wall 22 screwed onto the piston rod 10 with external hexagon surfaces 32, a piston skirt 24 and a mouthpiece 26 arranged inside the piston.
  • the piston skirt 24 is using both ring seals 28 with both End walls 20, 22 screwed.
  • the mouthpiece 26 has a cylindrical central section 36 and adjacent, continuously widening end sections 34, 38 and is held at a distance from the inner surface 40 of the front end wall 20 and from the inner surface 42 of the rear piston end wall 22, so that circumferentially open fluid chambers 44, 46 are formed, which communicate with the annular space 52 between the mouthpiece 26 and the piston skirt 24.
  • the inner surface 40 of the front end wall 20 is recessed in an annular region between a radially inner region and a radially outer region, the transitions being geometrically double-curved and a shape that continuously tapers towards the rear in the inner region.
  • a low-resistance flow channel is created which is free of dead spaces and which is approximately U-shaped in axial section.
  • the entire inner surface 40 of the front piston end wall 20 thus becomes highly effective with cooling liquid applied.
  • annular groove 48 into which three narrow, resilient holding elements 50 which are attached to the mouthpiece 26 at equal circumferential intervals and which enable the problem-free insertion into the annular groove 48, furthermore give the mouthpiece a radial adjustability, so that the retraction of the Coolant supply pipe 16 is facilitated and which finally give the mouthpiece 26 an axial mobility, so that the mouthpiece can adjust itself axially according to the prevailing pressure conditions in the fluid chambers 44, 46.
  • the casting piston 18 ' has radial cooling fins 54 on the front piston end wall 20 and axial cooling fins 56 on the piston skirt 24.
  • the front end of the mouthpiece 26 engages in recesses 60 of the ribs 54.
  • the mouthpiece remains when the piston is removed 26 still after removing the coolant supply pipe 16 in its position. 2, the mouthpiece 26 can adjust itself axially on the coolant supply pipe in accordance with the prevailing flow conditions.
  • the piston 18 ′′ according to FIG. 3 corresponds to the piston 18 according to FIG. 1, but the rear piston end wall 22 is formed in one piece with the piston skirt 24.
  • the mouthpiece 4 has an axially self-adjustable mouthpiece 26 with axial pins 50 "on the rear end face of the mouthpiece, which are slidably received in blind holes 62 of the rear piston end wall 22.
  • the mouthpiece can adjust itself automatically in accordance with the hydrostatic equilibrium to optimize the coolant flow.
  • the casting piston 18 IV (Fig. 5) has a mouthpiece 26 which consists of an inner sleeve 27 and an outer sleeve 29. The latter is rigidly connected to the front piston end wall 20 by means of radial ribs 21.
  • An axial spring 64 installed between the two mouthpiece parts 27, 29 presses the inner part of the mouthpiece 27 backwards against a ring 62.
  • the coolant supply pipe 16 abuts the conical extension surface 34 when it is inserted into the mouthpiece 26.
  • the inner part of the mouthpiece 27 is also moved against spring force when the coolant supply pipe 16 is pushed in further.
  • the ribs 21 are very narrow and practically do not hinder the radial flow in the chamber 44.
  • the piston 18 v according to FIG. 7 also has a mouthpiece 26 consisting of the two parts 27, 29, the outer part 29 of which, however, is releasably held on the front piston end wall 20 by means of three axial pins 68, which are screwed into threaded holes 66 in the end wall 20 and on wear two free ring flanges at the free ends.
  • the mouthpiece outer part 29 has a bore in the front end wall for each axial pin 68, through which the ring flanges fit, a circumferential groove 74 adjoining the bore on the outside, a circumferential slot 70 adjoining the bore and a recess 72 on the inside of the mouthpiece arranged at the end of the slot 70 which engages the inner ring flange of the axial pin 68 and is held in the locked position by the spring 64.
  • the mouthpiece 26 can therefore can be released in a bayonet-like manner from the end wall 20 by pushing it axially forward, then rotating it by an angle corresponding to the length of the circumferential slots 70 and then pulling it axially backwards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP84101330A 1983-02-18 1984-02-09 Piston pour machines à couler sous pression Withdrawn EP0116906A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3305594 1983-02-18
DE3305594A DE3305594C1 (de) 1983-02-18 1983-02-18 Giesskolben fuer Druckgiessmaschinen

Publications (1)

Publication Number Publication Date
EP0116906A1 true EP0116906A1 (fr) 1984-08-29

Family

ID=6191156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84101330A Withdrawn EP0116906A1 (fr) 1983-02-18 1984-02-09 Piston pour machines à couler sous pression

Country Status (4)

Country Link
US (1) US4598762A (fr)
EP (1) EP0116906A1 (fr)
JP (1) JPS59153561A (fr)
DE (1) DE3305594C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0344042A1 (fr) * 1988-05-26 1989-11-29 Snpe Ingenierie Dispositif de transfert à piston refroidi d'une composition métallique en fusion sur une presse verticale de moulage à forte pression
DE4230080A1 (de) * 1992-09-09 1994-03-10 Hugo Kunz Druckgießkolben, insbesondere für Kaltkammer-Druckgießmaschinen

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4667729A (en) * 1986-02-28 1987-05-26 Zecman Kenneth P Shot tip for cold chamber die casting machine
US4842039A (en) * 1988-06-27 1989-06-27 Otto Kelm Self-aligning plunger tip
JPH0246961A (ja) * 1988-08-04 1990-02-16 Hitachi Metals Ltd プランジャチップ
US4899804A (en) * 1989-02-21 1990-02-13 Hammerer Norman L Plunger tip for cold chamber die cast machine
US5048592A (en) * 1989-10-18 1991-09-17 Allper Ag Plunger for a diecasting machine
US6311761B1 (en) 1999-12-22 2001-11-06 Ronald G. Steininger Plunger tip for die casting apparatus
DE20309181U1 (de) * 2003-06-13 2004-10-28 Allper Ag Mehrteiliger Kolben für eine Kaltkammer-Druckgießmaschine
US7464744B2 (en) * 2005-09-13 2008-12-16 Peter Manoff Shot sleeve insert and method of retarding heat erosion within a shot sleeve bore
DE102005048717A1 (de) * 2005-10-12 2007-04-19 Allper Ag Mehrteiliger Kolben für eine Kaltkammer-Giessmaschine
CN103974790B (zh) * 2011-10-14 2018-02-13 科卢斯博知识产权有限公司 用于直线温度控制熔融的容装浇口
US9757795B1 (en) 2012-03-30 2017-09-12 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting hot sleeve for use with low iron aluminum silicon alloys
US9114455B1 (en) 2012-03-30 2015-08-25 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
US9731348B1 (en) 2012-03-30 2017-08-15 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
US9114456B1 (en) 2012-03-30 2015-08-25 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
US10486229B1 (en) 2012-03-30 2019-11-26 Brunswick Corporation Method and apparatus for avoiding erosion in a high pressure die casting shot sleeve for use with low iron aluminum silicon alloys
JP5442903B1 (ja) * 2013-10-11 2014-03-19 東芝機械株式会社 成形装置、半凝固金属の製造装置、成形方法及び半凝固金属の製造方法
US10166601B2 (en) 2015-11-17 2019-01-01 United Technologies Corporation Die cast tip cover and method of managing radial deflection of die cast tip
US10173261B2 (en) 2015-11-17 2019-01-08 United Technologies Corporation Highly cooled die casting plunger

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3605871A (en) * 1969-05-01 1971-09-20 Richard K Whitehead Sr Die casting machine including sequentially acting compound pistion assembly machine
US4154288A (en) * 1977-11-02 1979-05-15 Arrow-Acme Corporation Injection molding machine having swivel shot tip assembly
DE2904883B1 (de) * 1979-02-09 1979-07-19 Bayerische Motoren Werke Ag Druckkolben fuer Druckgiessmaschinen
FR2416754A1 (fr) * 1978-02-08 1979-09-07 Weingarten Ag Maschf Dispositif de refroidissement pour le piston d'injection d'une machine a couler sous pression
FR2431334A1 (fr) * 1978-07-19 1980-02-15 Buehler Ag Geb Dispositif amortisseur pour piston d'injection de machine de coulee sous pression
DE3013226A1 (de) * 1980-04-03 1981-10-15 Nippon Light Metal Co. Ltd., Tokyo Verfahren und vorrichtung fuer die kuehlung der spitze eines pressstempels in einer spritzgussmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2233132B2 (de) * 1972-07-06 1974-08-01 Fa. Hugo Kunz, 7443 Frickenhausen Druckkolben für eine Druckgießmaschine
US4334575A (en) * 1980-03-18 1982-06-15 Nippon Light Metal Co., Ltd. Method for cooling a plunger tip in a die casting machine of the cold chamber type and apparatus therefor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3605871A (en) * 1969-05-01 1971-09-20 Richard K Whitehead Sr Die casting machine including sequentially acting compound pistion assembly machine
US4154288A (en) * 1977-11-02 1979-05-15 Arrow-Acme Corporation Injection molding machine having swivel shot tip assembly
FR2416754A1 (fr) * 1978-02-08 1979-09-07 Weingarten Ag Maschf Dispositif de refroidissement pour le piston d'injection d'une machine a couler sous pression
FR2431334A1 (fr) * 1978-07-19 1980-02-15 Buehler Ag Geb Dispositif amortisseur pour piston d'injection de machine de coulee sous pression
DE2904883B1 (de) * 1979-02-09 1979-07-19 Bayerische Motoren Werke Ag Druckkolben fuer Druckgiessmaschinen
DE3013226A1 (de) * 1980-04-03 1981-10-15 Nippon Light Metal Co. Ltd., Tokyo Verfahren und vorrichtung fuer die kuehlung der spitze eines pressstempels in einer spritzgussmaschine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0344042A1 (fr) * 1988-05-26 1989-11-29 Snpe Ingenierie Dispositif de transfert à piston refroidi d'une composition métallique en fusion sur une presse verticale de moulage à forte pression
FR2631862A1 (fr) * 1988-05-26 1989-12-01 Snpe Ingenierie Dispositif de transfert a piston refroidi, d'une composition metallique en fusion sur une presse verticale de moulage a forte pression
DE4230080A1 (de) * 1992-09-09 1994-03-10 Hugo Kunz Druckgießkolben, insbesondere für Kaltkammer-Druckgießmaschinen
DE4230080C2 (de) * 1992-09-09 1998-04-09 Hugo Kunz Druckgießkolben, insbesondere für Kaltkammer-Druckgießmaschinen

Also Published As

Publication number Publication date
DE3305594C1 (de) 1984-07-19
US4598762A (en) 1986-07-08
JPS59153561A (ja) 1984-09-01

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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Effective date: 19850412

17Q First examination report despatched

Effective date: 19861024

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Effective date: 19880223