CN104028695B

CN104028695B - A kind of subsides chamber cavityless casting method

Info

Publication number: CN104028695B
Application number: CN201410199626.XA
Authority: CN
Inventors: 高宗为
Original assignee: Zhejiang Institute of Mechanical and Electrical Engineering Co Ltd
Current assignee: GUANGZHOU RONGZE MOULD CO., LTD.
Priority date: 2014-05-12
Filing date: 2014-05-12
Publication date: 2016-06-01
Anticipated expiration: 2034-05-12
Also published as: CN104028695A

Abstract

The present invention discloses a kind of subsides chamber cavityless casting method: (1) makes frame mould, and the inner chamber contour structure of frame mould is corresponding with the external form contour structure of foundry goods; (2) adopt bedded-in moulding, Di Keng bottom surface is first filled hole bed sand, then layer overlay clay water glass sand, levelling, with carbon dioxide hardening; Put into frame mould, taking frame mould inside edge as benchmark, bury gate spool in advance simultaneously; Filling out sand in frame mould neighboring again, inner side is struck off by Tian Sha limit, limit; (3) adopt carbonic acid gas sand mold is hardened, after frame mould is taken out; (4) press casting section thickness and make foam formwork, taking type hole as benchmark, foam formwork is pasted on type hole; In foam formwork moulding process, it is implanted into resistance wire from ingate to the foam formwork of open top; (5) placing open top, foundry goods inner chamber fills out sand; (6) adopting carbonic acid gas to blow hard inner chamber molding sand, then resistance wire access power supply, under electrically heated, foam formwork melts; (7) pour into a mould, solidify, cool and clear up.

Description

A kind of subsides chamber cavityless casting method

Technical field

The invention belongs to cavityless casting technical field, it is specifically related to a kind of subsides chamber cavityless casting method, the method first making the moulding again of full pattern mould of this subsides chamber cavityless casting method and at present general full mold technology is different, this subsides chamber cavityless casting method first makes die cavity, then pastes chamber making full mold apperance by benchmark of die cavity holes face. This subsides chamber cavityless casting method especially is applicable to producing the large-scale housing class foundry goods of single and mini-batch production.

Background technology

Along with the development of the industries such as mine, metallurgy, the energy, generating, the proportion shared by massive casting is increasing. The production of massive casting has a feature, general batch is less, but size is very big, wood pattern molding technique routinely, required apperance making amount is big, long in time limit, cost height, and because of foundry goods batch little, the frock cost such as apperance, sandbox is spread out in castings production cost, causes castings production cost higher. In addition, adopt conventional cavityless casting technology, first make the step of foam mold filling moulding again, owing to the rigidity of foam mold is lower, it is easy to cause apperance distortion when filling out sand, affect casting quality.

Summary of the invention

For the difficult problem faced in the production of prior art single and mini-batch production massive casting, the present invention provides a kind of and pastes chamber cavityless casting method, and this subsides chamber cavityless casting method apperance makes fast simply, molding operation is easy, cost is low.

The present invention takes following technical scheme: a kind of subsides chamber cavityless casting method, carries out as follows:

(1) making frame mould, the inner chamber contour structure of frame mould is corresponding with the external form contour structure of foundry goods;

(2) adopt bedded-in moulding, Di Keng bottom surface is first filled hole bed sand, then layer overlay clay water glass sand, levelling, with carbon dioxide hardening; Put into frame mould, taking frame mould inside edge as benchmark, bury gate spool in advance simultaneously; Filling out sand in frame mould neighboring again, inner side is struck off by Tian Sha limit, limit;

(3) adopt carbonic acid gas sand mold is hardened, after frame mould is taken out;

(4) press casting section thickness and make foam formwork, taking type hole as benchmark, foam formwork is pasted on type hole; In foam formwork moulding process, it is implanted into resistance wire from ingate to the foam formwork of open top;

(5) placing open top, foundry goods inner chamber fills out sand;

(6) adopting carbonic acid gas to blow hard inner chamber molding sand, then resistance wire access power supply, under electrically heated, foam formwork melts;

(7), after pouring into a mould, solidify, cooling and clear up, complete foundry goods and make.

Preferably, frame mould is made up of flange and many mould bases mouldings, and many mould bases mouldings are crisscross connected, and longitudinally adjacent mould bases moulding leaves spacing, and laterally adjacent mould bases moulding leaves spacing, and the upper end of longitudinal mould bases moulding is connected to flange.

Preferably, longitudinal mould bases moulding is connected by detachable with horizontal mould bases moulding.

Preferably, the upper end of longitudinal mould bases frame is connected by detachable with flange.

Preferably, step (3), needs but the shaping hole of non-foundry goods for connecting because of frame mould, adopts molding sand to cram, and repair out the fillet of foundry goods; Meanwhile, after mould surface smoothing, form complete type hole.

Preferably, step (5), the outer end of gate spool is connected a pouring cup.

The foam full pattern mould that the present invention pastes the employing of chamber cavityless casting method glues together by benchmark of face, type hole in the splicing of moulding scene, solving full pattern mould problem on deformation in conventional full pattern modeling, the method simultaneously implanting resistance wire in full pattern mould solves the exhausting problem of conventional full pattern die cast.

The inventive method is simple, and apperance making and moulding cost are low, and casting quality is reliable.

Accompanying drawing explanation

Fig. 1 is casting structure figure to be cast.

Fig. 2 is the frame mould structure iron corresponding with Fig. 1 foundry goods.

Fig. 3 is the frame mould three-dimensional structure diagram corresponding with Fig. 1 foundry goods.

Fig. 4 is the external form moulding figure pasting chamber cavityless casting method.

Fig. 5 is the type hole figure pasting chamber cavityless casting method.

Fig. 6 is the subsides chamber foam full pattern construction drawing pasting chamber cavityless casting method.

Fig. 7 is the closed moulding figure pasting chamber cavityless casting method.

Fig. 8 is the die cavity figure pasting chamber cavityless casting method.

Embodiment

Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is done explanation in detail.

The present embodiment pastes chamber cavityless casting method, carries out as follows:

(1) easy loose joint formula frame mould is made

As shown in Figure 1, foundry goods 1 is rectangular housing foundry goods, and it has flange 1-1, many muscle plate 1-2 and foundry goods wall 1-3.

As shown in Figure 2,3, the inner chamber contour structure of frame mould 2 and the external form contour structure of foundry goods 1 are corresponding. In the present embodiment, frame mould 2 comprises flange 2-1 and mould bases moulding 2-2, and flange 2-1 is corresponding with casting flange limit, is in the top of frame mould. The interior limit of mould bases moulding 2-2 is corresponding with foundry goods outer wall dimension, width 50��100mm, thickness about 30mm, is interposed between within the scope of 600��1000mm, longitudinally with the horizontal crisscross distribution of moulding and form the framework of frame mould with flange 2-1.

When foundry goods wall has round-corner transition, the mould bases moulding 2-2 corresponded also should make circular shape, and in its framework bar, limit arc radius is corresponding with foundry goods outer wall arc radius.

When having the structures such as muscle plate 1-2 and boss when foundry goods outer wall, then full pattern mould made by muscle plate and boss, forms a full mold mold-like structure of frame mould and is connected with other mould bases frame, now utilizes muscle lath directly to form framework bar as far as possible.

For further facilitating the follow-up molding operation of mould, the connection between each parts of frame mould can survive connection and detachable connection, as by screw, rivet or tenon grafting.

(2) external form moulding

For massive casting, generally by bedded-in moulding, Di Keng bottom surface is first filled certain thickness hole bed sand, layer overlay clay water glass sand 3 again, levelling, with carbon dioxide hardening, then frame mould 2 is put, taking frame mould inside edge as benchmark, burying gate spool 4 in advance, inner several outlets of gate spool 4 touch with the bottom mould bases moulding 2-2 of frame mould 2, then fill out sand in frame mould 2 neighboring simultaneously, inner side is struck off by Tian Sha limit, limit, as shown in Figure 4.

(3) delivery and the finishing of type hole

After external form has made type, with carbonic acid gas, sand mold is hardened, unclamp the loose joint structure between each parts of frame mould 2, frame mould is split and takes out. For because of the shaping hole of mould bases moulding 2-2, then cramming with molding sand, the hole that muscle plate and boss etc. are formed is not crammed, and repairs out the fillet of foundry goods, after mould surface smoothing, will form complete type hole, as shown in Figure 5 simultaneously.

(4) paste chamber full pattern to make

Press casting section thickness and prepare foam formwork 5, taking type hole as benchmark, foam formwork adopts foam formwork glue on type hole. In foam full pattern mold forming process, the apperance et al. Ke resistance wire 7 from ingate to open top, as shown in Figure 6.

(5) placing open top 6, foundry goods inner chamber fills out sand, as shown in Figure 7. Pouring cup 8 is connected with the outer end of gate spool 4.

(6) hard inner chamber molding sand is blown with carbonic acid gas, then resistance wire access power supply, under electrically heated, foam melts around resistance wire, form a parichnos from ingate to open top, as shown in Figure 8, make complete to this casting mold, complete foundry goods after casting metal after coagulation, cooling and cleaning and make.

The present invention pastes chamber cavityless casting method and has following technique effect:

1, compared with conventional casting, the present invention, without the need to making complicated external mold and core mould, only need to make the benchmark of simple frame mould for the formation of type hole, and operates without the need to molding, mould turnover, mould assembling etc. in modeling process, also without the need to sandbox, the production of massive casting is very easy.

2, compared with existing cavityless casting technique, owing to apperance has cavities bear when moulding, modeling process is not out of shape, overcome massive casting cavityless casting foam mold to be easily out of shape, the shortcoming being easily shifted during molding operation, and foam is the water route that scene is spliced to form foundry goods, apperance makes more simple and convenient.

3, it is implanted into, in Foam Pattern, unique innovative point that resistance wire is the present invention, in the cavityless casting casting process of routine, foam melts can produce a large amount of gas, when exhaust is obstructed to when making air pressure height to a certain extent, gas enters foundry goods and forms pore, foam gas under high pressure easily forms the slag of pitch formula, thus makes foundry goods form pore, dreg defect. And in the present invention, resistance wire implanted by foundry goods, make die cavity be formed from ingate to open top to the venting channels type before cast, when making casting pouring outside the straight-through type of foam gas, solve in cavityless casting technique the pore folder slag problem easily occurred.

Above the preferred embodiments of the present invention are described in detail, for the those of ordinary skill of this area, according to thought provided by the invention, embodiment will change, and these changes also should be considered as protection scope of the present invention.

Claims

1. paste a chamber cavityless casting method, carry out as follows:

(1) making loose joint formula frame mould, the inner chamber contour structure of frame mould is corresponding with the external form contour structure of foundry goods; Described frame mould is made up of flange and many mould bases mouldings, and many mould bases mouldings are crisscross connected, and longitudinally adjacent mould bases moulding leaves spacing, and laterally adjacent mould bases moulding leaves spacing, and the upper end of longitudinal mould bases moulding is connected to flange; Described longitudinal mould bases moulding is connected by detachable with horizontal mould bases moulding; The upper end of described longitudinal mould bases frame is connected by detachable with flange;

(3) adopt carbonic acid gas sand mold is hardened, after frame mould is taken out; Need but the shaping hole of non-foundry goods for connecting because of frame mould, adopt molding sand to cram, and repair out the fillet of foundry goods; Meanwhile, after mould surface smoothing, form complete type hole;

(5) placing open top, foundry goods inner chamber fills out sand;

(6) adopting carbonic acid gas to blow hard inner chamber molding sand, then resistance wire access power supply, under electrically heated, the foam melts around resistance wire, forms a parichnos from ingate to open top;

2. subsides chamber cavityless casting method as claimed in claim 1, it is characterised in that: step (5), the outer end of gate spool is connected a pouring cup.