CN205362559U

CN205362559U - A densener for disappearing mould negative pressure casting

Info

Publication number: CN205362559U
Application number: CN201620132309.0U
Authority: CN
Inventors: 燕声壮; 项恒新; 王章忠; 王红星
Original assignee: Jiangsu Grinka Machinery Co Ltd
Current assignee: Jiangsu Grinka Machinery Co Ltd
Priority date: 2016-02-22
Filing date: 2016-02-22
Publication date: 2016-07-06
Anticipated expiration: 2026-02-22

Abstract

The utility model belongs to the technical field of the casting, a a densener for disappearing mould negative pressure casting is related to, its characterized in that densener adopt sectional area be 1~7mm2 commercially available nickel coated iron wire or with the filiform of foundry goods material, the filiform forms the densener the same with the foundry goods shape through winding mode. The densener adopts the samely with the foundry goods material or commercially available nickel plating filament, is convenient for to prepare the densener with the same shape of foundry goods. The structural style that the densener adopted straight -bar and winding to combine together, fixed, supporting role are played to the straight -bar structure, can prevent the too big pressure of the chill quality disappearance model chamber of collapsing. Densener simple structure, with low costs, easy operation, the good reliability, suitability nature is strong, is applicable to to have the dispersed thermal center foundry goods that lost pattern casting takes shape that disappears.

Description

A kind of internal densener for Negative casting of EPC

Technical field

This utility model belongs to casting technology field, is specifically related to a kind of production for Negative casting of EPC and disperses the internal internal densener without shrinkage cavity shrinkage porosity castings of thermal center class.

Background technology

Lost foam casting is the emerging casting technique of casting industry, it is that the foamed plastic model bonding similar to casting dimension shape is combined into model cluster, after brushing refractory coating and drying, it is embedded in vibration molding in drystone sand, pour into a mould liquid metals under negative pressure, make model gasify and occupy modal position, after solidification cooling, forming the novel casting method of required foundry goods.The technical process of lost foam casting is simply more than traditional sand casting process, its technological advantage has: casting accuracy height, flexible design, without the core in conventional cast and the coremaking Ministry of worker, do not have in tradition sand casting because core size, cleaning produce and alleviate the weight of spray, the advantages such as machine-finish allowance is little.

Due to the feature that Negative casting of EPC rate of cooling in advance is fast so that having dispersion thermal center class foundry goods in process of setting, thermal center place can not get effective feeding and forms shrinkage cavity and porosity casting flaw at cast-internal, has a strong impact on casting quality and even scraps.Fig. 1 is for having typical dispersion thermal center class foundry goods.It can be seen from figure 1 that foundry goods has the 10 scattered screwed hole boss in place, boss place wall thickness, for heat energy-saving position, non-boss place wall is relatively thin, and single-casting quality is smaller.Owing to thermal center disperses, it is impossible to carrying out concentrating feeding, after castable, the thermal center place of foundry goods forms shrinkage cavity and shrinkage defect, and after machining, these casting flaws yet suffer from, and cause that foundry goods is scrapped.

Summary of the invention

In order to overcome disadvantages mentioned above, this utility model provides a kind of internal densener for Negative casting of EPC.Its simple in construction, low cost of manufacture, Technology is easily mastered, highly reliable.

This utility model solves the technical scheme of above-mentioned technical problem: for the internal densener of Negative casting of EPC, it is characterised in that internal densener adopts sectional area to be 1 ~ 7mm²Commercially available nickel coated iron wire or with the filament of castings material, described filament forms the internal densener identical with cast shape by the mode being wound around.

Usually, described internal densener quality can select according to heat energy-saving position quality, and internal densener quality is the 2 ~ 3.5% of part thermal center place quality.

Described internal densener adopts sectional area to be 1 ~ 7mm²Commercially available nickel coated iron wire or with the filament of castings material, form the internal densener identical with cast shape by the mode being wound around, adjust internal densener total amount by the number of turns, winding form is generally " M " type or " S " type.

There is internal densener straight-bar the termination of described filament.

The beneficial effects of the utility model are:

1. internal densener adopts identical with castings material or commercially available nickel plating filament, it is simple to the internal densener of preparation and foundry goods same shape.

2. internal densener adopts straight-bar and is wound around the version combined, and straight-bar structure plays fixing, supporting role, can prevent the excessive be collapsed evaporative pattern die cavity of chill quality.

3. this internal densener simple in construction, cost are low, and simple to operate, highly reliable, the suitability is strong, it is adaptable to have the foundry goods that dispersion thermal center lost foam casting shapes.

Accompanying drawing explanation

Fig. 1 is the internal densener layout schematic diagram that this utility model embodiment Negative casting of EPC has dispersion thermal center foundry goods.

Fig. 2 is the vertical plane sectional structure schematic diagram of Fig. 1.

Fig. 3 is one of internal densener version in embodiment.

Fig. 4 is in embodiment the two of internal densener version.

In figure: 1-has dispersion thermal center foundry goods；2-boss；3-internal densener；4-filament；5-internal densener straight-bar.

Detailed description of the invention

Below in conjunction with embodiment and accompanying drawing, this utility model is described in detail in.

Embodiment

The internal densener that the present embodiment has dispersion thermal center foundry goods for Negative casting of EPC is example.

For the internal densener of Negative casting of EPC, it is mainly characterized by internal densener 3 and adopts sectional area to be 1 ~ 7mm²Commercially available nickel coated iron wire or with the filament 4 of castings material, described filament 4 forms the internal densener 3 identical with cast shape by the mode being wound around.

In embodiment, internal densener 3 mass can select according to heat energy-saving position quality, and internal densener quality is the 2 ~ 3.5% of part thermal center place quality.Described filament 4 forms the internal densener identical with cast shape by the mode being wound around, and adjusts internal densener total amount by the number of turns, and being wound around form (referring to accompanying drawing 3 and 4) is " M " type or " S " type, and there is internal densener straight-bar 5 termination of filament 4.

Application examples

The present embodiment has the process of dispersion thermal center casting 1 for Negative casting of EPC: preset internal densener contoured foam modelling, referring to attached Fig. 1 and 2, the thermal center place (boss 2) being easily formed shrinkage cavity shrinkage porosity of shaping mould type intracavity it is fixed on by internal densener straight-bar 5, and with 0.2 ~ 0.4MPa air pressure, molding beadlet after conventional ripening is injected in mold cavity, subsequently mould is heated to 115 ~ 120 DEG C, make molding beadlet under the effect of residual pentane, mold cavity fuses, obtains preset internal densener contoured foam model；The bubbles model made is removed from the molds, sends in drying unit and dry, make the preset internal densener white mould of contoured foam model and internal densener dry；The dried preset internal densener white mould of contoured foam model and running gate system are sticked with glue and connects conventional group string, organize the coating that after having gone here and there, outside is coated with routine, the white mould after being coated with is placed in the drying chamber of 45 ~ 55 DEG C continuously to drying.Each group of string is put into running gate system glue bonding composition cluster routinely airtight sandbox and adds sand ram-jolt, and pour into a mould under-0.03 ~-0.02MPa negative pressure, required blank without castings after cooling, can be obtained.

Claims

1. the internal densener for Negative casting of EPC, it is characterised in that internal densener adopts sectional area to be 1 ~ 7mm²Commercially available nickel coated iron wire or with the filament of castings material, described filament forms the internal densener identical with cast shape by the mode being wound around.

2. internal densener as claimed in claim 1, it is characterised in that described internal densener quality is the 2 ~ 3.5% of part thermal center place quality.

3. internal densener as claimed in claim 1, it is characterised in that the winding form of described filament is " M " type or " S " type.

4. the internal densener as described in claim 1 or 3, it is characterised in that there is internal densener straight-bar the termination of described filament.