DE2103752A1 - Light metal melt dispensing - from bell and weir overflow fitted melt holding furnace - Google Patents

Abstract

The installation comprises a gas tight cover with a charging lid and three bells projecting into the melt. The bells, one of which is the lifting, the other the measuring and the third the dispensing bell, are connected to a pressure regulated compressed gas supply by separate lines with separate valves. The melt level in each bell is adjusted so as to obtain a fixed melt surface level and the melt can be made to overflow over a weir type outlet delivering a measured amount of metal. The equipment is remote controlled and is inteded for casting of e.g., Al Mg.

Description

B e c h r e i b u n g Dosing device for melts of all kinds, in particular light metals - aluminum, magnesium - from holding furnaces and comb. Melting and warming furnaces on die-casting machines, chill molds and other forms.

A. D o s i e r re a l e n t to holding furnaces B. D o s i e r r e d e ctio n to komb. Melting and holding furnaces.

A.) The invention relates to a metering device, which in portions Melts, alkalis or similar aggressive liquids, in particular melts Warhold furnaces in the filling sleeve of a die-casting machine, chambers of a mold or Allocates inlet manifold to a form.

The device is available as a cover Pos .: 1 with a sin filling cover Pos .: 2 placed on a pouring vessel from above and can be conventional as well as on specially made furnace can be operated.

Projecting into the melt from above, completely free of moving parts or Vernil runs, three bells Pos .: 3, 4 and 5 act on the work cycle variable melt pool level or other level heights.

It does not matter what type of heating element is used for the Holding or melting find use. The material design of the crucibles can be adapted to the potting material unhindered. This is how you become with aluminum Use graphite or stamped and hardened crucibles, as well as steel crucibles flowed or welded with subsequent layering or unprocessed for Magnesium and other metals can use.

A number of automatic loading devices are known which have more or less a complicated discharge technology but due to their mostly closed design are difficult and expensive to maintain.

We will not go into any further technical details here.

The present invention is based on the simplest idea, the raising of the I3adspiegel with subsequent measuring and subsequent dosing with three bells protruding from above into the Schmelse by means of an inner one Compressed gas to do.

All three bells where pos .: 3 as lifting and lowering bell, pos .: 4 as a measuring bell with pressure switch and pos .: 5 as on a handwheel with scaling adjustable dosing bell is to be addressed with simple directional control valves Pos .: 6, 7 and 8 in a separate switch cabinet for sequential control with one another connected, which is described below in the text.

F u n c t i o n s b e s c h r e i b u n g Fig. 1 Dosing device on a die-casting machine with holding furnace.

Fig. 2 Dosing device as a single unit without an oven (illustration different outlet openings) Fig. 3 Dosing device on a die-casting machine with combined melting and holding furnace.

1,) The crucible whatever shape and outlet opening is starting out from the overflow edge about 10 mm below the same filled with smelt. ( Spoon, ladle, forklift with swivel pan or similar).

2,) Dosing device with the three bells on the melt side from above Place on the edge of the crucible by means of a crane or loading device and, if necessary Secure with sash fasteners.

All three bells are now hanging from above in the melt and can are now filled with pressurized gas from the valves Pos .: 6, 7 and 8. The delimited Pressure surfaces are now self-sealing in the melt and form separate projection surfaces which can be pressurized with pressurized gas.

3,) Adjustment of the pouring portion on the handwheel of the bell Pos .: 5 according to Length "L" from the upper edge of the bathroom mirror.

4,) Adjustment of the measuring bell Pos .: 4 to the depth by means of the adjusting ring. Adjust the precision pressure regulator Pos .: 10 so that when the bell is ventilated with compressed gas Via valve Pos .: 6 a slight outflow of pressurized gas through the lower edge of the bell the melt occurs. Set the pressure switch on the preload spring so that with increasing back pressure, which now affects the membrane of the pressure switch The bath is raised approx. 1 mm below the overflow and a switching cycle takes place.

The measuring bell is now set up and always switches on the same Point when the bathroom level is raised with the lifting bell Pos .: 3. However is Prerequisite that the Neßglocke is lower with its lower edge than the minimal Bathroom level is assumed. The system is with each new melting or Filling to be resubmitted.

The operational i) die cast machine with the included switching program the dosing device can now start up.

See switching cycle described below.

Form closed - lifting bell Pos .: 3 is now from the precision pressure regulator Pos .: 11 vented via the valve Pos .: 7 - bath level rises - measuring bell Pos .: 4 is immediately ventilated from the fine pressure regulator Pos .: 10 via the valve Pos .: 6 continues to rise up to the set measuring point. Valve Pos .: 7 of the lifting bell Pos .: 3 closes - bathroom level is raised for filling.

Dosing bell Pos .: 5 is now transferred from the precision pressure regulator Pos .: 10 the valve pos .: 6 vented and the measuring bell pos .: 4 vented via valve pos .: 6. The bath level continues to rise until the melt over the overflow edge into the filler sleeve drains through the drain pipe. The dosing bell remains ventilated until it reaches the bottom Bell edge, just like with the measuring bell, the compressed gas flows off through the melt. Bathroom mirror with the overflow on the same level has compensated.

Dosing process ended.

The lifting bell and the dosing bell vent through their valves and bath level falls back to its new starting height.

In the meantime, the plunger of the pressure casting machine, or chill mold the liquid metal is pressed into the mold.

"End" The actual filling process takes five to seven seconds lasted and was filled with portion tolerances between # 2 - 4% max. The dosing device is vented and immediately ready for the next filling process ready for filling.

All the ways of the crucible and the device are very easy to clean and easy to wait. (Or to be replaced).

In the case of aggressive media such as aluminum or silumin, the bells are Made of ceramic materials and in corresponding steel frames above outside of the melt on the cover Pos .: 1 held.

While the bells are blazing on the other edge of the bell by the As the gas flows through the melt, protective gassing occurs, which is not disappear from the surface of the enamel due to thermal buoyancy.

The device is mainly suitable for filling processes high-speed pressure gas machines and is robust due to its simplicity and profitable, and can be converted quickly and optimally with changing pouring programs.

B.) Dosage and structure of the device as described above, however divided by the partition pos .: 20 and extended to form an additional melting chamber.

The partition is about 10 mm higher than the actual overflow edge in the warming part.

The melt sump in the melt part up to the upper edge of the partition Pos .: 20 is pending, by feeding a metal hammer to the overflow in the warming part brought.

The ingot can be fed in via all conveyor systems, similar to the illustration in Figure 3.

A second measuring bell with pressure switch Pos .: 21, which in turn in the heat holding part the level is controlled and that after the dosing process Via the flap Pos .: 22 with separation Pos .: 23 the automatic supply of hot melt material. If the maximum bath level is reached about 20 mm below the drainage edge, there is no ingot fed.

The crucible pos .: 24 has a slightly raised crucible bottom, which is regarded as an additional heat supply surface to be used in the melting part with small Get along with melt sump and accommodate additional heating elements.

The slope improves the possibility of manual cleaning of outside by means of a rake for the impurities that settle on the ground.

The furnace works with separate temperatures, which are separated by means of Termo elements are monitored once in the Schmelsteil and in the holding part.

Keeping warm 670 - 700 OC melt, 750 - 78o ° C The melting temperatures especially the melting media and the metals themselves.

The area of application is intended for all foundries and serves that purpose technical progress as well as automation, the idea of getting into the melt from above protruding bell is the essential feature and is from the application (disclosure-script No. 1483677) has been derived and tried.

Claims (5)

Expectations 1.) Dosing device for melts of all kinds, especially light metals - Alluminium - magnesium - from holding ovens of the conventional kind, as well as special ones Design with regard to the device. Combined melting and holding furnaces on die casting machines, Molds and molds that are to be charged individually or on cycle devices. All facilities and ovens that can be attached to the device allow. 2.) Device according to claim 1, characterized in that on a cover plate 1 with a cover 2, three bells 3, 4 and 3 projecting into the melt from above 5 Lifting bell, measuring bell, dosing bell connected to the Wag valves. 6, 7 and 8 as well as the fine pressure rules 10 and 11 is arranged in which can be raised and lowered in a controllable manner by means of an inert pressure gas a melt pool level with measuring and metered filling is possible. The part of each bell that is sufficient in the melt bids one self-sealing pressure projection surface with which a displace over the coordinated Length by means of mechanical adjustment via a handwheel, a blow-off at the bottom Bell edge is possible through the melt. The coordinated length of a bell or with a mineminem elbow connected pressure switch determined by the overflow edge and the pushed measured bath level the dosing volume of the melt. 3.) Device according to claim 1, which is a bell or several bells independent of each other in a certain order influencing, controlling and regulating. 4.) Additional melting chamber for holding ovens with overflow wall 20 for Holding chamber 30 and the fourth measuring bell 21, characterized in that a Overflow into the holding chamber 30 due to the approach of a ingot with displacement due to their own volume is fed in a sequence, which max. Bath level is dependent on the previous measurement by the measuring bell 20. 5.) All flammable liquids, such as media, alkalis and others aggressive liquids that have to be filled without contact. The source material for items 3, 4 and 5 can be determined according to the medium to be dosed. L e r s e i t e