CN103394650A

CN103394650A - Casting method of turbofan

Info

Publication number: CN103394650A
Application number: CN2013103556823A
Authority: CN
Inventors: 陈黎明
Original assignee: Liyang Wansheng Casting Co ltd
Current assignee: Liyang Shuangsheng Machinery Manufacturing Co ltd
Priority date: 2013-08-16
Filing date: 2013-08-16
Publication date: 2013-11-20
Anticipated expiration: 2033-08-16
Also published as: CN103394650B

Abstract

The invention relates to the technical field of turbofan casting, in particular to a turbofan casting method, which comprises the following steps: material inspection, precoated sand manufacturing, core making/modeling, core setting, box assembling, smelting, pouring, box opening, dead head knocking, rough casting, cleaning, polishing, fine casting, appearance inspection, oiling, warehousing inspection, packaging and ex-warehouse, wherein the core setting method comprises the following steps: firstly, placing the No. 3 core into a lower box, and then sequentially placing the No. 2 core and the No. 1 core; the casting method comprises the following steps: molten iron is poured by lifting through a crane, the molten iron enters from an upper box, the periphery of the molten iron is poured while the molten iron is poured on two sides, and then workers ignite discharged gas with open fire. According to the invention, a flat box pouring method is adopted, the head position of the No. 2 mud core is extended and pressed and fixed by the No. 1 mud core, so that scrapping caused by the upward floating of the mud core is effectively prevented, and the conventional pouring process is characterized in that molten iron is fed from the periphery and exhausted from the top end, so that the molten iron is filled more stably and the exhaust is facilitated.

Description

A kind of casting method of turbofan

Technical field

The present invention relates to the turbofan casting technology field, especially a kind of casting method of turbofan.

Background technology

Existing turbofan casting method is to adopt positive case pouring technology, monolateral cast, but pouring technology is distinguished to some extent.Existing turbofan casting method be the 1# core at nowel, the 2# core is on the 1# core, the 3# core is placed on the 2# core, 2# and 3# core core print push up top box core print locating surface.There is following problem in existing pouring technology, and the mud core can't be fixed, and easily floats, thereby causes whole scrapping.

Summary of the invention

, in order to overcome the deficiency of existing technology, the invention provides a kind of casting method of turbofan.

The technical solution adopted for the present invention to solve the technical problems is: a kind of casting method of turbofan, its flow process is: the examination of materials-precoated sand making-coremaking/moulding-lower core-mould assembling-melting-cast-unpack-strike dead head-rough polishing-cleaning, polishing-essence throwing-visual examination-oil-ware-house-in inspection-packing-outbound.

The method of described lower core is: first No. 3 cores are lowered to nowel, more lower No. 2 cores, No. 1 core successively, No. 2 core is pushed down fixing by No. 1 core;

The method of described mould assembling is: glue on the top of nowel surrounding and No. 2 cores, and then cover top box and carry out mould assembling, casing gets togather and with black sand, surrounds surrounding afterwards, and the above pushes down with foundary weight;

The method of described cast is: molten iron waters by traveling crane, and molten iron enters from top box, and to carrying out the surrounding cast when watering, then the workman ignites with the gas that naked light will be discharged in both sides.

According to another embodiment of the invention, further comprise the middle die cavity for circle of described top box, be distributed with to bilateral symmetry two large cast gates and sprue, the outer circle of die cavity is evenly distributed with the exhaust rising head, the outside of exhaust rising head is provided with a circle ingate, and the ingate outside is circular cross-runner.

The invention has the beneficial effects as follows, adopt the method for anti-case cast, No. 2 mud core core print position elongations are pushed down fixing by No. 1 mud core, effectively prevent due to scrapping that mud core floating causes, and present pouring technology is advanced molten iron from surrounding, the top gas that begins to rehearse, can make like this molten iron fill type comparatively steadily and be beneficial to exhaust.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is the operation chart after lower core;

Fig. 2 is the operation chart after mould assembling;

Fig. 3 is the structural representation of top box;

In figure 1, top box, 11, die cavity, 12, large cast gate, 13, sprue, 14, the exhaust rising head, 15, ingate, 16, circular cross-runner, 2, nowel, 3, No. 3 cores, 4, No. 2 cores, 5, No. 1 cores, 6, foundary weight, 7, emit pipe.

The specific embodiment

A kind of casting method of turbofan, its flow process is as follows, the examination of materials-precoated sand making-coremaking/moulding-lower core-mould assembling-melting-cast-unpack-strike dead head-rough polishing-cleaning, polishing-essence throwing-visual examination-oil-ware-house-in inspection-packing-outbound.

Lower core of the present invention, be one of committed step of the present invention, as shown in Figure 1, No. 3 cores 3 is lowered to nowel 2, more lower No. 2

cores

4,5, No. 2 cores 4 of No. 1 core are pushed down fixing by No. 1 core 5 successively.Lower core method like this, can make No. 2 cores 4 fixing more firm, and be difficult for floating after cast.

Mould assembling of the present invention is one of committed step of the present invention, as shown in Figure 2, glue on the top of nowel 2 surroundings and No. 2 cores 4, then cover top box 1 and carry out mould assembling, and casing gets togather and with black sand, surrounds surrounding afterwards, the above pushes down with foundary weight 6, and the pipe 7 that emits of a plurality of exhausts is stretched in the outside.

Cast of the present invention, it is one of committed step of the present invention, as Fig. 3, it is circular die cavity 11 in the middle of top box 1, be distributed with to bilateral symmetry two large cast gates 12 and sprue 13, the outer circle of die cavity 11 is evenly distributed with exhaust rising head 14, and the outside of exhaust rising head 14 is provided with a circle ingate 15, and ingate 15 outsides are circular cross-runner 16.Molten iron waters by traveling crane, molten iron pours into from large cast gate 12, enter circular cross-runner 16 through sprue 13, enter the molten iron of circular cross-runner 16 by ingate 15, from surrounding, die cavity 11 is filled type, gas in die cavity 11 by exhaust rising head 14 from the interior discharge of die cavity 11, then the workman with naked light in the exhaust of igniting of exhaust rising head 14 surroundings.The indoor design of top box 1 can be changed, and at present, preferably ingate is provided with 18, and exhaust rising head 14 is provided with 5.Such cast design, can make molten iron enter more steady.

Silica sand is generally adopted in the examination of materials of the present invention, roughing sand, according to different foundry goods, selects silica sand, sees following table 1:

Table 1 roughing sand is selected table

Granularity

SiO2

Contain mud

Moisture

Little deal

Acid consumption value

Igloss

Cast steel 30/50

>97%

Cast iron 40/70

>90%

<0.2-0.3%

<0.5-1%

<5%

/

<0.5%

Coloured 70/200

>85%

Wherein, great thicker with the sand choosing, and general middle smallclothes order number can be more carefully.

The making of precoated sand of the present invention, first add the roughing sand heating, and temperature is controlled between 145 ± 10 ℃, adds on request raw material, and curing agent, resin fully are mixed even, and the mulling time is 150S, and be 10S hardening time, and total time should not be over 2 minutes.After mulling, curing finish, the cooling finished sand of emitting.

General fresh sand accounts for 10%, and reclaimed sand accounts for 90%; It is fixed that resin amount comes according to the quality of fresh sand and reclaimed sand, is generally the heavy 0.6-1.5% of sand, and fresh sand can be added to 2.0% left and right, adds silane can reduce resin demand; The curing agent addition is generally the 30-70% of amount of resin, with continous way or batch (-type) puddle mixer, first sand and curing agent is mixed, and the time is generally 30S-60S, and then adds resin to mix, and mulling total time is generally 1-2 minute, the use of shaking out immediately after mixing.

Coremaking of the present invention is a key, different from other core manufacturing craft, the particularity that it is arranged: first welded arbor, the reinforcing bar arbor is put into the sand machine of penetrating, penetrated sand during with coremaking and be wrapped in loam core, when being warming up to 120 ± 10 ℃, penetrates by mould sand, shooting time 7-10s, after penetrating sand and completing, intensification is solidified, and temperature rises to 160 ± 10 ℃ of isothermal curing 25 ± 2min, after completion of cure, core is got in die sinking, and matched moulds is penetrated sand and entered next circulation again when mould is cooled to 120 ± 10 ℃ voluntarily.

Above-mentioned an abundant disclosed explanation is carried out in lower core, mould assembling, melting, cast, the examination of materials, precoated sand are made, coremaking is the prior step for realizing that the technical program is very important, melting, unpack, rough polishing, cleaning, polishing, smart throwing, visual examination, oil, ware-house-in inspection, packing, outbound etc. are the conventional steps of the art, no longer do and repeat herein.

The present invention adopts the method for anti-case cast, the elongation of No. 2 mud core core print positions is pushed down fixing by No. 1 mud core, effectively prevent due to scrapping that mud core floating causes, and present pouring technology is advanced molten iron from surrounding, the top gas that begins to rehearse, can make like this molten iron fill type comparatively steadily and be beneficial to exhaust.

In sum, it is only preferred embodiment of the present invention, not be used for limiting scope of the invention process, all equalizations of according to the described shape of the claims in the present invention scope, structure, feature and spirit, doing change and modify, and all should be included in claim scope of the present invention.

Claims

1. the casting method of a turbofan, its flow process is: the examination of materials-precoated sand making-coremaking/moulding-lower core-mould assembling-melting-cast-unpack-strike dead head-rough polishing-cleaning, polishing-essence throwing-visual examination-oil-ware-house-in inspection-packing-outbound

It is characterized in that, the method for described lower core is: first No. 3 cores (3) are lowered to nowel (2), more lower No. 2 cores (4), No. 1 core (5) successively, No. 2 cores (4) are pushed down fixing by No. 1 core (5);

The method of described mould assembling is: glue on the top of nowel (2) surrounding and No. 2 cores (4), and then cover top box (1) and carry out mould assembling, casing gets togather and with black sand, surrounds surrounding afterwards, and the above pushes down with foundary weight (6);

The method of described cast is: molten iron waters by traveling crane, and molten iron enters from top box (1), and to carrying out the surrounding cast when watering, then the workman ignites with the gas that naked light will be discharged in both sides.

2. the casting method of turbofan according to claim 1, it is characterized in that, it is circular die cavity (11) in the middle of described top box (1), be distributed with to bilateral symmetry two large cast gates (12) and sprue (13), die cavity (11) Wai Yiquan is evenly distributed with exhaust rising head (14), the outside of exhaust rising head (14) is provided with a circle ingate (15), and ingate (15) outside is circular cross-runner (16).