A kind of suction pouring foundry goods removing from mould method
The invention belongs to casting technology field, relate to a kind of foundry goods removing from mould method in copper alloy and the casting of other low-melting alloy suction pouring.
Suction pouring is that one sets up vacuum by vacuum system in casting mold die cavity, by pressure differential, molten metal from bottom to top is pressed into die cavity, carries out the casting method of coagulation forming under the cooling of recirculated water.Process for suction casting is the effective way solving bar pore, shrinkage cavity and porosity and dreg defect.
Suction pouring equipment is suction pouring machine, is made up of a few parts such as main frame, vacuum extractor, cooling water system, crystallizer, switch boards.The suction pouring machine that we use is portable.
The key component of suction pouring machine is crystallizer, and crystallizer can be described as again suction casting mould, and foundry goods is shaping in crystallizer die cavity.Crystallizer is by working cover, overcoat, water pipe and vacuumize trunnion etc. and form.The total figure of crystallizer is shown in Fig. 1.
The periphery of inner wall water cooling of crystallizer (i.e. water-cooled metal mould), crystallizer end opening immerses in molten metal, it is suitable for reading connects vacuum system, molten metal rises up into crystallizer internal cavity and reach a certain height under atmospheric action, crystallizer inner metal liquid is solidified by export-oriented center, after to be solidified, crystallizer is risen, shift out liquid level, take out foundry goods.
Under normal circumstances, foundry goods removing from mould, crystallizer flange is manually knocked in main dependence, and by knocking the vibrations of generation, under the booster action of foundry goods self gravitation, foundry goods is deviate from from casting mold, and the major defect of the method is, foundry goods removing from mould process difficult, production efficiency is low.Artificial repeatedly knock crystallizer flange, the sealing of damage crystallizer water-cooling circulating system, causes crystallizer fault rate to remain high.
Summary of the invention
The object of the invention is the work workload alleviating operator, improve casting process production efficiency, reduce a kind of suction pouring foundry goods removing from mould method that crystallizer (i.e. water-cooled metal mould) is consumed.
The technology of the present invention solution is, first on the vacuum line of suction pouring machine crystallizer, a three-way connection is installed, one end of three-way connection connects with crystallizer die cavity, and one, two ends connect with vacuum tank in addition, and another is connected with compressed air gas source by compressed air gauge tap; Then, start to inhale casting, after suction casting completes, close vacuum tank, open compressed air gauge tap, carry out cooling and pressurizeing to the foundry goods in crystallizer die cavity, pressure is 0.3-0.5MPa, until foundry goods thoroughly departs from crystallizer.
The advantage that the present invention has and beneficial effect, the present invention is by the improvement to vacuum system, and increase compressed air supplement heat rejecter and the removing from mould of 0.3-0.5MPa, the foundry goods removing from mould time, by original 68 minutes, reduces to 12 minutes after improvement.The operating personnel of this station reduce to 1 people by 2 original people.The reclamation work amount of crystallizer and scrappage all reduce 50%.
Accompanying drawing explanation
Fig. 1 is the crystallizer schematic diagram of suction pouring machine;
Fig. 2 is technical solution of the present invention schematic diagram;
Fig. 3 is foundry goods removing from mould process first stage schematic diagram of the present invention;
Fig. 4 is foundry goods removing from mould process second stage schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is elaborated.
Vacuum line on the crystallizer 2 of original suction pouring machine installs a three-way connection 1, one end of three-way connection 1 connects with crystallizer die cavity 3, one, two ends are connected with vacuum tank 5 by vacuum switch 7 in addition, and another is connected with compressed air gas source 4 by compressed air gauge tap 6; The operating pressure of compressed air gas source 4 is 0.3-0.5MPa.As shown in Figure 2.
The operation principle of invention:
Operation principle signal is as shown in Fig. 3, Fig. 4.In casting process, after foundry goods suction casting completes, close vacuum switch, foundry goods 8 is first under the cooling of recirculated water 9, solidify gradually, then shrink slowly, shrink after foundry goods progressively produce small being separated with water mold, now recirculated water to the cooling effect of foundry goods because crystallizer sharply reduces with producing small separation between foundry goods.In order to make the removing from mould process of foundry goods time saving and energy saving, open the compressed air of 0.3-0.5MPa, compressed air 10 enters along crystallizer with producing small gap between foundry goods, under the quick cooling of compressed air 10, accelerate foundry goods and produce Solid State Contraction further, foundry goods is while bearing self gravitation, receive compressed air to the downward applied pressure of foundry goods, the size of this pressure can be controlled by the compressed-air actuated switch of adjustment, ensure smooth removing from mould, prevent casting fin, knob from splashing simultaneously and hurt sb.'s feelings.