DE1258555B - Horizontal cold chamber die casting machine - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B22d

German class: 31 b2- 17/30

Number: 1258 555

File number: V 29609 VI a / 31 b2

Filing date: October 27, 1965

Open date: January 11, 1968

The invention relates to a horizontal cold chamber die casting machine with mechanical loading of the filling chamber, for the automatic mass production of cast parts, with one on the machine frame attached, electrically heated pouring directly into the filling opening of the filling chamber Melting plant, which in its size and capacity for melting one for casting one Casting required amount is designed in the work cycle of the machine, the melting plant the Casting material also to be supplied to the machine in the work cycle in the amount corresponding to a casting and in the crucible an overflow pipe serving to drain the melt into the filling chamber is arranged, according to additional patent application V 27380 VI a / 31 R

In a cold chamber die casting machine, the pressure chamber is not located within the melt, it is built directly onto the die casting tool. The filling of the chamber or filling can Such machines are usually done by hand by scooping the melt from a holding furnace. However, automatic loading devices are also known in which the filling the chamber from the holding furnace with the help of controllable valves or a nitrogen pump takes place via a heated filling tube.

It has also been proposed a die-casting device in which the chamber directly from the Crucible is filled. This crucible, which is preferably heated by induction heat, is above the Filling opening of the filling sleeve arranged and has a compressed air-operated slide valve. Around To be able to do without a valve mechanism, it has also been proposed that the dosage the melt for the individual casting process by simply displacing and overflowing the melt from the crucible into an overflow pipe leading into the filling sleeve opening. That Displacement of the amount of melt required for the casting process is achieved by supplying a corresponding amount Pig in the cycle of the shot sequence of the die casting machine or by one - preferably on the overflow pipe - raisable and lowerable scoop causes.

In the last two cases mentioned, it has proven to be useful to check the crucible level lower the overflow process a little below the upper edge of the overflow pipe to prevent it from overflowing of metal, e.g. B. as a result of the increase in volume of the melt occurring during melting and as a result of tremors in the facility

Horizontal cold chamber die casting machine

Addition to additional registration:
V 27380 VI a / 31 b2 -
Interpretation document 1252 372

Applicant:

Volkswagenwerk Aktiengesellschaft,
3180 Wolfsburg

Named as inventor:

Karl-Heinz Nörthemann, 3501 Hoof

avoid. This can be achieved by using an immersion body, which is usually above the crucible and is only immersed in the melt during the overflow process. After the drain the intended amount of melt, the immersion body is raised again, whereby the melt level is raised lowers below the upper edge of the overflow pipe.

It has been found, however, that considerable deposits of oxides form on such movable bodies after only a few hours of operation, which interfere with the operation of the automated system. The invention therefore assumes that the melting level can be raised and lowered with the aid of an inert gas cushion. According to the invention, in a horizontal cold chamber die casting machine according to the additional patent application V 27380 VIa / 31b ² outlined in the introductory content, in particular for processing magnesium, inert compressed gas is preferably introduced in a timed manner through a bell protruding into the melt from above.

An exemplary embodiment of the invention will be explained below with reference to the figures. It shows

1 shows a melting and casting device for magnesium with the devices required for feeding ingots and a die-casting machine only partially shown, partially in section.
F i g. 2 shows a section through the crucible 6 according to FIGS. 1 and

F i g. 3 shows a plan view of the pig gripping tongs 12 according to FIG. 1.

In Fig. 1, 1 is the filling sleeve and 2 is the injection plunger - only partially shown Die casting machine 3 referred to. A gas-heated one is located above the filling opening la of the filling sleeve 1 Filling pipe 4 that is connected to the overflow pipe 5 of a crucible 6.

The crucible 6 is located in an insulating 7, wherein an induction coil 8 is arranged in the space between the crucible 6 and housing. 7 An agitator 9 ^; serves to homogenize the melt (see Fig. 2). The pigs 10 are fed into the crucible 6 according to the shot sequence of the die casting machine 3 via a roller conveyor 11 from a magazine (not shown) and by means of a hydraulically controlled, liftable and lowerable gripper 12, which is shown separately in FIG. The crucible 6 'can be closed by a locking slide 13 which is also hydraulically controllable.

When an ingot 10 is introduced into the crucible 6, the level of the melt in the crucible 6 rises , and a measured amount of melt passes through the overflow pipe 5 and the filling pipe 4 into the filling sleeve 1.
- So that after the intended amount of melt has drained, further melt liquid does not flow out through the overflow pipe 5 due to the vibrations of the casting system and the increase in volume of the melt, a bell 14 protruding into the melt from above is provided (see Fig. 2), into which at 15 an inert gas, preferably nitrogen, can be introduced. The nitrogen bubble pushes the melt down into the bell 14 and thereby raises the liquid level in the crucible 6. This nitrogen loading can be triggered automatically by feeding the pig 10 into the crucible 6. It is activated by a timer 16 and a. Three-way valve 17 with an upstream volume throttle 18 is controlled and only maintained for the duration of the filling of the filling sleeve 1. After the intended amount of melt has flowed off, the melting crucible is lowered below the upper edge of the overflow pipe 5 by letting the nitrogen escape at 19.

The gas used to raise the melting level can also be used for protective gassing of the entire Serve surface of the melt. For this purpose, the length of the bell 14 is adjusted so that the required raising of the level has just been reached when the pressurized gas is at the lower edge of the bell can emerge.

Claims (2)

Patent claims: 1. Horizontal cold chamber die casting machine with mechanical loading of the filling chamber, for the automatic mass production of castings - ^{Share 1} ', with an attached to the machine frame, directly pouring into the filling opening of the filling chamber' electrically heated melting system, which is designed in terms of size and power to melt an amount required for casting a casting in the cycle of the machine, with the Melting plant : The casting material is also to be fed to the machine in the work cycle in the amount corresponding to a casting and an overflow pipe serving to drain the melt into the filling chamber is arranged in the crucible, according to additional patent application V 27380 VIa / 31 b ² , characterized in that in particular for processing magnesium a preferably inert compressed gas is to be introduced in a time-controlled manner through a bell (14) protruding into the melt from above. 2. Die casting machine according to claim 1, characterized in that the in the melt protruding part of the bell (14) is so long that when the necessary raising of the Melting level in the crucible (6) a gas leakage at the lower edge of the bell is possible. ' 1 sheet of drawings 709 718/340 12.67 © Bundesdruckerei Berlin