CN102699278A

CN102699278A - Casting technology of boat anchor

Info

Publication number: CN102699278A
Application number: CN2012101823011A
Authority: CN
Inventors: 孙启俊
Original assignee: CHAOHU JIANGYANG SHIP FITTINGS CO LTD
Current assignee: CHAOHU JIANGYANG SHIP FITTINGS CO LTD
Priority date: 2012-06-05
Filing date: 2012-06-05
Publication date: 2012-10-03

Abstract

The invention provides a casting technology of a boat anchor and specifically to a technology for casting a boat anchor by adopting an evanescent mode. The casting technology of the boat anchor comprises the steps of: (1) dividing the boat anchor into a plurality of independent combined parts, preparing foamed plastic, cutting the foamed plastic into independent parts of the boat anchor respectively by using a resistance wire cutting device and then bonding the parts to form an integral boat anchor foamed plastic model; (2) coating a layer of coating with a certain thickness on the surface of the boat anchor foamed plastic model to form a casting type inner shell; and (3) casting and replacing, to be specific, pouring in a metal liquid inside the boat anchor casting model, melting down or gasifying the boat anchor foamed plastic model under the action of the metal liquid, filling the sectional cavity of the casting model with the metal liquid, and solidifying the metal liquid while the casting model rotates so as to form a cast boat anchor. The casting technology of the boat anchor, disclosed by the invention, is usually used for the casting technology of the boat anchor; and after the evanescent mode is adopted for casting the boat anchor, production efficiency is improved greatly, production cost is reduced greatly, labor intensity is also reduced greatly; and meanwhile, the product yield is improved from 70% of the traditional technology to about 90%.

Description

The casting technique of ship anchor

Technical field

The present invention relates to the casting technique of ship anchor, specifically is a kind of process that adopts lost foam casting ship anchor.

Background technology

At present, produce marine anchor and all still adopt traditional wooden model or metal pattern, water-glass sand casting technique, and these traditional technologies there are several insurmountable problems:

1: wooden model or metal pattern cost of manufacture are high, and efficient is low.

2: the water-glass sand cost is high and can produce a large amount of solid refuses.

3: labour intensity is big, and labor cost is high.

4: wooden model and die cast must have die joint, fash intractability big (needing the air bound polishing), consumptive material consuming time.

5: the traditional handicraft yield rate is low; Generally only can reach about 70%, and adopt advanced foaming mould, because the specification of ship anchor is many; The few reason of each specification batch process amount; Cause single ship anchor cost too high, get on, adopt traditional technology to such an extent as to be still at present to such an extent as to can't be applied to actual production.

Summary of the invention

For addressing the above problem, the invention provides a kind of technology, process using following steps of the present invention with lost foam casting ship anchor:

(1), the ship anchor is divided into several separate parts, be ready to the bubble plastics, with the resistance wire cutting device bubble moulded sheet material and be cut into the single parts in the ship anchor respectively, then these parts are carried out bondingly, make it to become whole ship anchor and steep moulding model;

(2), mould coatings:, form the casting mold inner casing with the certain thickness coating of ship anchor bubble moulding model surfaces coated one deck;

(3), vibration molding: its operation comprises as follows: the casting bed preparation---places EPS model---back-up sand---sealing typing;

(4), cast displacement: in casting mold, pour into molten metal, under the heat effect of molten metal, make said ship anchor bubble moulding model fusing or gasification, be full of the casting mold die cavity by molten metal, molten metal solidifies under the casting mold rotation, forms foundry goods ship anchor;

(5), cooling processing, sandbox is tilted to hang out foundry goods or directly from sandbox, to hang out foundry goods, foundry goods and dry sand natural separation can be reused after the dry sand of the separating processing.

The invention beneficial effect: after lost foam casting ship anchor replacement conventional ship anchor casting technique, yield rate has improved 20% ~ 30%, and labour intensity has reduced, and has improved production efficiency, and cost also reduces greatly.

The specific embodiment

The casting technique of ship anchor may further comprise the steps among the present invention:

1. manufacturing casting mold: at first; Sized according to the ship anchor model is divided it; Be divided into several independent combiners; Be ready to bubble then and mould sheet material, bubble is moulded sheet material cut with resistance wire according to the combiner of the ship anchor of correspondence, behind the excision forming with glue with several adhering components to the bubble moulding model that can form the ship anchor together;

2. mould coatings: in order to improve the strength and stiffness of EPS model; Improve the anti-molding sand scouring capability of model surface; The distortion of model when preventing to add model surface breakage and vibration molding and negative pressure shaping in the sand process; Guarantee the dimensional accuracy of foundry goods, it is 1.2mm that the bubble moulding model of ship anchor is coated with last layer thickness outward, and coating is dried down at 45 degree air.

3. vibration molding: its operation comprises following operation: the casting bed preparation---places EPS model---back-up sand---sealing typing;

(1) casting bed preparation: the sandbox that will have aspirating chamber is placed on the shake table, and chucking.The bed load of 80mm thickness, vibration ramming are put in the bottom; Molding sand is binder free, does not have and dose thing, water-free dried quartz sand; The ferrous metal temperature is high, can select thicker sand for use, and aluminium alloy adopts than fine sand; Molding sand will use after treatment repeatedly; Sandbox is the single face opening, be provided with the sandbox of aspirating chamber or exhaust tube, lifting or walking mechanism.

(2) place the EPS model: after the jolt ramming, place the EPS model group, and training sand is fixed.　

(3) back-up sand: add dry sand, the while carries out fastening to it at three stereo directionals, and selection of time 45 seconds makes molding sand be full of each position of model, and the bulk density of molding sand is increased;

(4) sealing typing: the sandbox surface seals with plastic sheeting, and with being pumped into certain vacuum in the sandbox, the difference of leaning on atmospheric pressure and casting mold internal pressure is kept the casting-up process and do not collapsed diffusing with sand grains " bonding " together with vavuum pump.

4, cast displacement: during the cavityless casting cast, under the heat effect of liquid metals, EPS model generation pyrolytic gasification; Produce a large amount of gases, constantly through the coating molding sand, outwards discharging; In casting mold, model and metal gap, form certain air pressure, liquid metals constantly occupies the EPS modal position, pushes ahead; The replacement process of liquid metals and EPS model takes place, and the final result of displacement is the foundry goods that forms the ship anchor.

5, cooling processing; Directly from sandbox, hang out foundry goods, foundry goods and dry sand natural separation, the dry sand of separating can be reused after treatment.

After adopting lost foam casting ship anchor, not only the productivity ratio than classical production process improves greatly, and yield rate also improved 20% ~ 30%, and production cost is lower, and labour intensity is low, and range of application is wider.

Claims

1. the casting technique of ship anchor is characterized in that comprising following processing step:

(1), the ship anchor is divided into several independent combiners, be ready to the bubble plastics, the bubble plastics be cut into front combination partial model respectively, then these parts are carried out bondingly, make it to become whole ship anchor and steep moulding model with the resistance wire cutting device;

(3), cast displacement: in said casting mold, pour into molten metal, under the heat effect of molten metal, make said ship anchor bubble moulding model fusing or gasification, be full of the casting mold die cavity by molten metal, molten metal solidifies under the casting mold rotation, forms the foundry goods of ship anchor.

2. the casting technique of ship anchor according to claim 1 is characterized in that: this technology also comprises cooling processing, and sandbox is tilted to hang out foundry goods or directly from sandbox, hang out foundry goods, foundry goods and dry sand natural separation.

3. the casting technique of ship anchor according to claim 1 is characterized in that: the also involving vibrations moulding of this technology, its operation comprises following operation: the casting bed preparation---places EPS model---back-up sand---sealing typing.

4. the casting technique of ship anchor according to claim 1 is characterized in that: said foamed plastics adopts bubble to mould sheet material.

5. the casting technique of ship anchor according to claim 1 is characterized in that: the paint thickness on ship anchor bubble moulding model surface is 0.5～2mm.