CN203578679U

CN203578679U - Expendable pattern casting mold

Info

Publication number: CN203578679U
Application number: CN201320758175.XU
Authority: CN
Inventors: 刘周旭; 刘明熙
Original assignee: Qingdao Great Yun Machinery Co Ltd
Current assignee: Qingdao Great Yun Machinery Co Ltd
Priority date: 2013-11-27
Filing date: 2013-11-27
Publication date: 2014-05-07
Anticipated expiration: 2023-11-27

Abstract

The utility model discloses an expendable pattern casting mold which comprises a white mold body, wherein the white mold body and a dry type cylinder liner engine body have the same structure, and a precoated sand core is arranged on the water jacket part of the white mold body; a plurality of positioning core heads are arranged on the precoated sand cores and positioned at side surface auxiliary holes of the water jacket part, one ends of the positioning core heads are connected with the precoated sand core, and the other ends of the positioning core heads extend out of the side surface auxiliary holes. According to the expendable pattern casting mold, the problems that molten metal leaks and the sand core can move easily can be solved by combining the precoated sand core technology and the positioning core head technology.

Description

A kind of evaporative pattern cast model

Technical field

The present invention relates to a kind of evaporative pattern cast model, belong to processing model field.

Background technology

Lost foam casting is called again dry sand full mold negative pressure casting, is referred to as EPC abroad, is one of state-of-the-art casting technique in the world at present, is described as once " revolution " in casting history, is referred to as green casting of 21 century both at home and abroad.This method is first made the usual said white mould of bubble moulding model by technological requirement, be coated with special high-temperature resistant coating, after dry, be placed in special sandbox, by technological requirement, insert dry sand again, utilize three-dimensional vibrating consolidation, vacuumize casting metals liquid under state, now white mould gasification disappears, molten metal is replaced white mould, copying the foundry goods the same with steeping moulding model. its technological process comprises: make the special fireproof coating of bubble moulding model-composite pouring system-model surface spary and dry-special interlayer sandbox is placed on three-dimensional vibrating workbench-inserts bed load (dry quartz sand) jolt ramming, strike off-bubbles model of oven dry is put on bed load, by technological requirement, fill up dry sand, numerical control vibration appropriate time, then strike off case mouth-cover case mouth with plastic sheeting, put cup, starting vacuum system, after the fastening moulding of dry sand, pour into a mould, model type disappears, molten metal replaces its position-release vacuum, by technique mould turnover after foundry goods condensation, from loose quartz sand, take out foundry goods.

At present, while making dry cylinder body in Technology of EPC, because the gap partly of the water jacket between cylinder sleeve and shell is limited and complex geometry, usually cause back-up sand unreal, the molten metal seepage that this can cause between body and cylinder sleeve, causes waste product.Application publication number is evaporative pattern cast model and the casting method thereof that the Chinese invention patent of CN103212669A discloses a kind of engine cylinder body, this model comprises the sand core of water jacket that is used to form engine cylinder body cast model water jacket part, the water jacket of this model partly packs film covered sand core into, can effectively solve because dry sand is filled the unreal problem that causes the molten metal leakage between body and cylinder sleeve and then cause waste product.But during cast, because the flow velocity of molten metal is very fast, the moment that core touches molten metal can make core be subjected to displacement, and the displacement of core often causes internal structure and the size between cylinder body and cylinder sleeve accurate not, causes waste product.Therefore need a positioner to position film covered sand core, at the two ends of core, each fixes a location core print conventionally, but only locates both sides, the moment that core contacts with molten metal, the core displacement that still can rotate.But add in addition positioner, relate to again and how to add, the problem how positioner of interpolation is cleared up after foundry goods completes.

Summary of the invention

In order to address the above problem, the invention provides a kind of evaporative pattern cast model, the method of a kind of lost foam casting dry cylinder body is also provided, adopts film covered sand core technology and locate core print technology and combine and solved the problem that molten metal seepage and core are easily subjected to displacement.

To achieve these goals, the technical solution of employing is in the present invention:

An evaporative pattern cast model, is characterized in that, comprises white mould body, by expanded material, made, white mould body comprises words spoken by an actor from offstage mould, outer white mould I, outer white mould II, and white mould body is identical with the structure of dry cylinder body, and the water jacket of described white mould body is partly provided with film covered sand core; Described film covered sand core is provided with several location core prints, location core print is positioned at the fabrication hole place, side of water jacket part, one end of location core print is connected on film covered sand core, the other end stretches out this side fabrication hole, described location core print is made by precoated sand, described location core print stretches out Bai Mo, puts into sandbox insert after dry sand when white mould, and fixedly film covered sand core of dry sand is lived on the locating core crown.

Further, the two ends of described film covered sand core are respectively provided with a location core print.

The beneficial effect that the present invention can produce:

(1) adopt prefabricated film covered sand core, be bumped in advance Bai Mozhong, solved because dry sand is filled the unreal problem that causes the molten metal leakage between body and cylinder sleeve and then cause waste product;

(2) location core print is set on film covered sand core, in sandbox, locate core print and go deep in dry sand fixedly film covered sand core, during casting of molten metal, because film covered sand core adhesive therefor is than the late gasification of white mould, while making to pour into a mould, core can not shake or the offset phenomena such as floating, improves quality and the yield rate of product;

(3) utilize the fabrication hole of engine dry cylinder body itself, need not separately establish hole, simple to operate.

Accompanying drawing explanation

Accompanying drawing 1 is the structural representation of water jacket part film covered sand core of the present invention.

Wherein: 1. film covered sand core; 2. locate core print.

The specific embodiment

A method for lost foam casting dry cylinder body, specifically comprises the following steps:

(A) adopt expanded material to prepare the white mould of dry cylinder body;

(B) adopt precoated sand to prepare the film covered sand core 1 of dry cylinder body water jacket part, this film covered sand core 1 is provided with several location core prints 2, as shown in Figure 1;

(C) pack the film covered sand core with location core print into white mould corresponding water jacket part, wherein said water jacket is partly the cylinder sleeve of dry cylinder body and the part between shell;

(D) white mould is bonded together.

Described location core print 2 is positioned at the fabrication hole place, side of water jacket part, and one end of location core print 2 is connected on film covered sand core 1, and the other end stretches out this side fabrication hole.

The preparation method of described film covered sand core comprises:

(B1) carry out hot briquetting after precoated sand being injected to hot box, make core, in this precoated sand, contain adhesive precoated sand is bonded together;

(B2) in whose surfaces, apply coating, then dry, make the film covered sand core 1 with location core print 2 matching with water jacket partial shape.

Because the body of dry cylinder body has one for the built-in hollow water jacket of water circulation, be used for to engine cooling, therefore this hollow water jacket dry sand in common law back-up sand may fill hardly, namely hollow water jacket cannot form according to the set shape of evaporative pattern cast model, causes waste product.In order to solve the unreal waste product causing of back-up sand, the present invention also specially improves on evaporative pattern cast model, first white mould is divided into inside and outside two parts from hollow water jacket, words spoken by an actor from offstage mould is integrated, can insert the inner space 3 of film covered sand core 1, be close together closely with the inwall of film covered sand core 1, outer Bai Moyanbaimo medium line is divided into outer white mould I, outer white mould II two parts, be close together closely with the outer wall of film covered sand core 1, each several part adopts conventional gluing form by words spoken by an actor from offstage mould, outer white mould I, outer white mould II three parts stick together, after pouring molten iron, film covered sand core 1 becomes the dry sand being scattered, can be from reserved entering, delivery port and reserved fabrication hole are poured out, formed the hollow jacket space of film covered sand core 1 shape, as long as make the shape of film covered sand core 1 according to the shape of hollow water jacket, just can solve that back-up sand is unreal has caused the problem of waste product.Fabrication hole can be spread plug with water blocking when product turnout.

As shown in Figure 1, a kind of evaporative pattern cast model that uses said method to make, comprises white mould body, and white mould body comprises words spoken by an actor from offstage mould, outer white mould I, outer white mould II, white mould body is identical with the structure of dry cylinder body, and the water jacket of described white mould body is partly provided with film covered sand core 1; Described film covered sand core 1 is provided with several location core prints, and location core print 2 is positioned at the fabrication hole place, side of water jacket part, and one end of location core print 2 is connected on film covered sand core 1, and the other end stretches out this side fabrication hole.

Described white mould is made by expanded material polystyrene.

Described location core print is made by precoated sand, with film covered sand core 1 be integral type structure.Use is with film covered sand core 1 model of location core print 2 models, precoated sand is injected in this model and prepared, the film covered sand core 1 of making is with the location core print that is integral structure with it, fixation, and the location core print of this film covered sand core is identical with its material, and disintegrates and to be also consistent completely for the time of dry sand.

The two ends of described film covered sand core 1 are respectively provided with a location core print.

Described location core print 2 stretches out Bai Mo, puts into sandbox insert after dry sand when white mould, and location core print 2 withstands fixedly film covered sand core 1 of dry sand.

During employing Technology of EPC is cast, casting of molten metal, Bai Mo gasification, the time that becomes dry sand due to film covered sand core is later than the time that Bai Mo gasifies, in molten metal is very short time liquid, that film covered sand core disintegrates not yet, the dry sand in the location core print contact sandbox of the two ends on film covered sand core and side is fixed, and prevents straight-line displacement and the rotation displacement of core, location core print plays tight positioning action, prevents film covered sand core displacement.When film covered sand core disintegrates, become dry sand, the last dry sand with the inner filling of white mould flows out from fabrication hole and entery and delivery port together, and cleaning is convenient.And utilize the location core print that film covered sand core carries to position, do not need to add in addition positioner, just avoided the step after casting complete, positioner removed, simple to operate.Adopt the present invention to cast dry cylinder body, product qualified rate can improve 80%.

Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited in above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.

Claims

1. an evaporative pattern cast model, is characterized in that, comprises white mould body, by expanded material, made, white mould body comprises words spoken by an actor from offstage mould, outer white mould I, outer white mould II, and white mould body is identical with the structure of dry cylinder body, and the water jacket of described white mould body is partly provided with film covered sand core; Described film covered sand core is provided with several location core prints, location core print is positioned at the fabrication hole place, side of water jacket part, one end of location core print is connected on film covered sand core, the other end stretches out this side fabrication hole, described location core print is made by precoated sand, described location core print stretches out Bai Mo, puts into sandbox insert after dry sand when white mould, and fixedly film covered sand core of dry sand is lived on the locating core crown.

2. a kind of evaporative pattern cast model according to claim 1, is characterized in that, the two ends of described film covered sand core are respectively provided with a location core print.