Fixed melting furnaces

Applications

The fixed (holding) furnaces are intended for baling-out melt as may be necessary, and tilting furnaces are intended for pouring metal directly from the crucible.

PP 100/12

Design features

The furnace has a welded frame made from metal sections lined with lightweight refractory and fibrous thermal insulation materials. Coiled heaters are arranged against furnace walls and assure uniform heating of the crucible. Coils are placed into ceramic tubes to increase service life of the heaters to the utmost as compared to other placement modes and provide free radiation into the working chamber of the furnace.

Replacement of the heaters and crucible is simplified as much as practical. For the purpose, the furnace is accomplished with a detachable top frame. The heaters are replaced when the crucible is removed and the top frame is detached. The heater contacts are in a terminal box with a readily-removable cover.

In the tilting furnaces, a space-saving unfailing hydraulic drive produced by an Italian company is used instead of a mechanical one to tilt the crucible. When pouring, the drive allows a fine crucible tilt angle adjustment.

Stationary furnaces are usually equipped with domestic crucibles produced by Luga Abrasive Plant. If required, crucibles of foreign producers can be used.

Furnace control system is based on advanced temperature microcontrollers and thyristor converters. These components increase operator's comfort significantly, cut costs of equipment maintenance and ensure a more precise adjustment of the temperature profile.

Advantages:

Low acquisition costs; no need for drafting and approving procedures for the furnace installation project; in oppose to cooling of induction furnaces, flowing water is not a prerequisite, so less investments are to be made in a new production department.
Better service life of the crucible in the resistance furnaces and additional heat losses cut (e. g. related to warming water used to cool the inductor as well as to transformer no-load losses) allow a decrease in cast unit cost as compared to induction furnaces.
Easy design and control facilitate installation and maintenance of the furnaces at the customer level.
Permission for metallurgical applications is available.

Overall plan

Наименование	Metal type to be melted	Crucible holding capacity for aluminum/copper, kg	Melting time (designed data) liquid charge , h	Melting time (designed data) solid charge, h	Weight, kg	Power, kW	Maximum melt temperature, oC	Maximum furnace temperature, oC
PP 100/11	aluminium	30	2	3,5	430	38	950	1100
PP 100/12	copper	100	3	4,5	550	38	1050	1200
PP 20/11	aluminium	6	1,5	3	250	12	950	1100
PP 20/12	copper	20	2,5	3,5	350	25	1050	1200
PP 200/11	aluminium	61	2	3,5	550	41	950	1100
PP 200/12	copper	200	3	5	700	65	1050	1200
PP 300/11	aluminium	91	2	3,5	680	41	950	1100
PP 300/12	copper	300	3	5	1400	75	1050	1200
PP 400/11	aluminium	121	2	3,5	750	65	950	1100
PP 400/12	copper	400	3	5	1600	75	1050	1200
PP 50/11	aluminium	15	1,5	3	400	21	950	1100
PP 50/12	copper	50	3	4	450	25	1050	1200
PP 500/11	aluminium	152	2	3,5	1000	65	950	1100
PP 500/12	copper	500	3	5	1800	80	1050	1200
PP 750/11	aluminium	227	2	3,5	1100	70	950	1100
PP 750/12	copper	750	3	5	200	90	1050	1200