Hot-chamber diecasting machine

Details Hot-chamber diecasting machine Hot-chamber diecasting machine

1996-02-07

1997-12-23

Lavinder, Jack W.

Metal founding

Control means responsive to or actuated by means sensing or...

Control of feed material enroute to shaping area

1641552, 164318, 164316, B22D 1732, B22D 1704

Patent

active

056998490

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION

The invention relates to a hot-chamber diecasting machine and, more particularly, to a hot-chamber diecasting machine in which the injection process is influenced by an electronic control device. Input signals coming from the injection assembly are supplied to the electronic control device. The diecasting machine is provided with a casting container that dips into the melt with a riser, and with a mouthpiece body mounted thereon. The mouthpiece body is guided with a nozzle tip up to a mold.
Hot-chamber diecasting machines of this type are known as in German Patent document DE-AS 21 43 937. In these machines, the casting container that dips into the melt is provided with a casting cylinder with a riser and with a mouthpiece body attached thereto, which can be guided up to the mold.
It is known that the diecasting process is one of the most economical manufacturing methods in the casting industry. It is performed with diecasting machines that carry out the injection process in three phases in order to achieve the highest possible product quality. It is known in this regard, as described in German Patent document DE 29 22 914, that in order to control the injection process, one may evaluate either travel-dependent signals or signals that depend on the injection pressure, from which conclusions can be drawn about the respective position of the casting ram and the degree of filling of the mold.
From German Patent document DE 42 16 773 A1, there is disclosed in a cold-chamber diecasting machine, a metal sensor that can be associated with the casting mold. However, the metal sensor described in the German Patent document DE 42 16 773 A1 serves exclusively to deliver a signal in real-time to an evacuation device located downstream from the mold. Due to the signal, a valve located upstream of the vacuum pump is closed before the metal melt reaches the vacuum pump. Other sensors that work with temperature sensors are associated with the casting cylinder as well in such cold-chamber diecasting machines in order to be able to detect and evaluate at least two parameters by means of two evaluation circuits at one point. Finally, so-called continuous valves have also been used, as described in German Patent document DE 42 18 556 A1, for controlling the injection process in cold-chamber diecasting machines, with whose assistance the movement of the casting ram and a multiplying ram can be controlled through the use of devices that measure travel and speed, with a computer being used to control the continuous valve.
In hot-chamber diecasting machines of the type described above, completely different installation conditions prevail. Much less space can be made available and the temperatures at the mouthpiece are very high (approximately 400.degree. C.).
In these hot-chamber diecasting machines, the bath level is one of the main interfering factors. Differences in bath level can lead to different filling processes in the pressure mold. For example, if the bath level is too high, then the mold cavity will already be filled during the first phase. If it is too low, then the second phase starts in the casting container or in the mouthpiece body already, and a blank results which can lead to high pressure peaks.
The goal of the invention is to avoid these disadvantages. This goal is achieved in a hot-chamber diecasting machine in which the injection process is influenced by an electronic control device. Input signals coming from the injection assembly are supplied to the electronic control device. The diecasting machine is provided with a casting container that dips into the melt with a riser, and with a mouthpiece body mounted thereon. The mouthpiece body is guided with a nozzle tip up to a mold. In the vicinity of the tip of mouthpiece body, a metal sensor is provided. The metal sensor is connected with the control device and likewise feeds input signals to it. High-dynamic continuous valves with switching times between 1 and 5 ms are provided to influence the injection process. The val

REFERENCES:
patent: 5125450 (1992-06-01), Kidd et al.

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