CN104690225A - Lost foam casting process for casting with good mechanical properties - Google Patents
Lost foam casting process for casting with good mechanical properties Download PDFInfo
- Publication number
- CN104690225A CN104690225A CN201310664379.1A CN201310664379A CN104690225A CN 104690225 A CN104690225 A CN 104690225A CN 201310664379 A CN201310664379 A CN 201310664379A CN 104690225 A CN104690225 A CN 104690225A
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- CN
- China
- Prior art keywords
- casting
- negative
- lost foam
- casting process
- final mask
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Casting Devices For Molds (AREA)
Abstract
The invention discloses a lost foam casting process for a casting with good mechanical properties. The lost foam casting process comprises the following steps of preparing all main parts from foam material blocks, and bonding all the prepared main parts to prepare a casting model; bonding a pouring gate for the casting model, and coating a refractory material at the outer sides of the casting model and the pouring gate to prepare a final model; placing the final model into a sand box, filling the sand box with dry sand, compacting by using a three-dimensional compacting table, and coating a plastic film on the sand box; uniformly introducing negative-pressure airflow to the sand box from top to bottom until the negative pressure is up to 0.04MPa below zero to 0.08MPa below zero, wherein the negative-pressure airflow is mixed gas of oxygen, nitrogen and carbon dioxide; and pouring molten metal into the region where the final model is arranged in the sand box, gasifying to enable the final model to disappear, replacing the final model with metal, and cooling to obtain the casting. By using the lost foam casting process, generated solid/liquid-phase products can be effectively reduced, molten metal can be prevented from being polluted, the heat radiating effect of metal becomes good, and the mechanical properties of the metal are improved.
Description
Technical field
The present invention relates to a kind of lost-foam casting method, be specifically related to a kind of lost foam casting process of foundry goods good mechanical property.
Background technology
Lost foam casting (also known as cavityless casting) is with foamed plastics (EPS, STMMA or EPMMA) macromolecular material make become and the design of part that casting will be produced, the duplicate full mold mould of size, (strengthening is played through dip-coating fireproof coating, bright and clean, permeation functions) and after drying, be embedded in drystone sand through three-dimensional vibrating moulding, casting molding flask pours into molten metal liquid under negative pressure state, make macromolecular material model by thermal evaporation extraction, and then the disposal molding New Casting Technique formed after being replaced cooled and solidified by liquid metals produces the novel casting method of foundry goods.
But during lost foam casting, due to the heat effect of molten metal in model gasification, meeting is molten metal and the neighbouring solid liquid phase product generating a large amount of high activity of the firm foundry goods formed again, pollute molten metal, cause carburetting, increase the defects such as hydrogen, and cause the radiating effect of molten metal to be deteriorated, Mechanical Property of Metal is declined.
Summary of the invention
The object of this invention is to provide a kind of lost foam casting process of foundry goods good mechanical property.
To achieve these goals, the technical solution of employing is in the present invention:
A lost foam casting process for foundry goods good mechanical property, comprises the following steps:
(1) adopt expanded material piecemeal to make each critical piece, and cast model is made in each critical piece bonding of making;
(2) be cast model bonding running channel, and make final mask at cast model and running channel outer application refractory material;
(3) final mask is put into sandbox, insert dry sand, adopt three-dimensional vibrating-compaction table jolt ramming, plastic covering film on sandbox;
(4) from top to down passes into negative-pressure air-flow uniformly and reaches-0.04 ~-0.08Mpa to negative pressure in sandbox, and this negative-pressure air-flow adopts the mist of oxygen, nitrogen, carbon dioxide;
(5) molten metal is poured into the region at corresponding final mask place in sandbox, in step (2), final mask gasification disappears, and metal replacement final mask, obtains foundry goods after cooling.
In described mist, oxygen volume content controls 70% ~ 85%.
The time that negative-pressure air-flow passes into remains between 100 ~ 130 seconds, and pouring temperature is at 1350 ~ 1400 degree.
Compared with prior art, the beneficial effect that the present invention can produce: the present invention effectively can reduce the generation of solid liquid phase product, preventing pollution molten metal, and the radiating effect of metal improves, and the mechanical performance of metal is improved.
Detailed description of the invention
Embodiment 1
A lost foam casting process for foundry goods good mechanical property, comprises the following steps:
(1) adopt expanded material piecemeal to make each critical piece, and cast model is made in each critical piece bonding of making;
(2) be cast model bonding running channel, and make final mask at cast model and running channel outer application refractory material;
(3) final mask is put into sandbox, insert dry sand, adopt three-dimensional vibrating-compaction table jolt ramming, plastic covering film on sandbox;
(4) from top to down passes into negative-pressure air-flow uniformly and reaches-0.08Mpa to negative pressure in sandbox, and this negative-pressure air-flow adopts the mist of oxygen, nitrogen, carbon dioxide;
(5) molten metal is poured into the region at corresponding final mask place in sandbox, in step (2), final mask gasification disappears, and metal replacement final mask, obtains foundry goods after cooling.
In described mist, oxygen volume content controls 85%.
The time that negative-pressure air-flow passes into remains between 130 seconds, and pouring temperature is at 1400 degree.
Embodiment 2
A lost foam casting process for foundry goods good mechanical property, comprises the following steps:
(1) adopt expanded material piecemeal to make each critical piece, and cast model is made in each critical piece bonding of making;
(2) be cast model bonding running channel, and make final mask at cast model and running channel outer application refractory material;
(3) final mask is put into sandbox, insert dry sand, adopt three-dimensional vibrating-compaction table jolt ramming, plastic covering film on sandbox;
(4) from top to down passes into negative-pressure air-flow uniformly and reaches-0.05Mpa to negative pressure in sandbox, and this negative-pressure air-flow adopts the mist of oxygen, nitrogen, carbon dioxide;
(5) molten metal is poured into the region at corresponding final mask place in sandbox, in step (2), final mask gasification disappears, and metal replacement final mask, obtains foundry goods after cooling.
In described mist, oxygen volume content controls 80%.
The time that negative-pressure air-flow passes into remains between 120 seconds, and pouring temperature is at 1380 degree.
Embodiment 3
A lost foam casting process for foundry goods good mechanical property, comprises the following steps:
(1) adopt expanded material piecemeal to make each critical piece, and cast model is made in each critical piece bonding of making;
(2) be cast model bonding running channel, and make final mask at cast model and running channel outer application refractory material;
(3) final mask is put into sandbox, insert dry sand, adopt three-dimensional vibrating-compaction table jolt ramming, plastic covering film on sandbox;
(4) from top to down passes into negative-pressure air-flow uniformly and reaches-0.04Mpa to negative pressure in sandbox, and this negative-pressure air-flow adopts the mist of oxygen, nitrogen, carbon dioxide;
(5) molten metal is poured into the region at corresponding final mask place in sandbox, in step (2), final mask gasification disappears, and metal replacement final mask, obtains foundry goods after cooling.
In described mist, oxygen volume content controls 70%%.
The time that negative-pressure air-flow passes into remains between 100 seconds, and pouring temperature is at 1350 degree.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited in above-mentioned citing, and the change 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 (3)
1. a lost foam casting process for foundry goods good mechanical property, is characterized in that, comprises the following steps:
(1) adopt expanded material piecemeal to make each critical piece, and cast model is made in each critical piece bonding of making;
(2) be cast model bonding running channel, and make final mask at cast model and running channel outer application refractory material;
(3) final mask is put into sandbox, insert dry sand, adopt three-dimensional vibrating-compaction table jolt ramming, plastic covering film on sandbox;
(4) from top to down passes into negative-pressure air-flow uniformly and reaches-0.04 ~-0.08Mpa to negative pressure in sandbox, and this negative-pressure air-flow adopts the mist of oxygen, nitrogen, carbon dioxide;
(5) molten metal is poured into the region at corresponding final mask place in sandbox, in step (2), final mask gasification disappears, and metal replacement final mask, obtains foundry goods after cooling.
2. the lost foam casting process of a kind of foundry goods good mechanical property according to claim 1, it is characterized in that, in described mist, oxygen volume content controls 70% ~ 85%.
3. the lost foam casting process of a kind of foundry goods good mechanical property according to claim 1, it is characterized in that, the time that negative-pressure air-flow passes into remains between 100 ~ 130 seconds, and pouring temperature is at 1350 ~ 1400 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310664379.1A CN104690225A (en) | 2013-12-07 | 2013-12-07 | Lost foam casting process for casting with good mechanical properties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310664379.1A CN104690225A (en) | 2013-12-07 | 2013-12-07 | Lost foam casting process for casting with good mechanical properties |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104690225A true CN104690225A (en) | 2015-06-10 |
Family
ID=53337987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310664379.1A Pending CN104690225A (en) | 2013-12-07 | 2013-12-07 | Lost foam casting process for casting with good mechanical properties |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104690225A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104985121A (en) * | 2015-06-23 | 2015-10-21 | 吉林省威创机电工程有限公司 | Casting method of vehicle medium-and-large-sized stamping die |
| CN106583650A (en) * | 2015-12-29 | 2017-04-26 | 马鞍山市三峰机械制造有限公司 | Method of casting wear-resistant part of side blade by lost foam process |
-
2013
- 2013-12-07 CN CN201310664379.1A patent/CN104690225A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104985121A (en) * | 2015-06-23 | 2015-10-21 | 吉林省威创机电工程有限公司 | Casting method of vehicle medium-and-large-sized stamping die |
| CN106583650A (en) * | 2015-12-29 | 2017-04-26 | 马鞍山市三峰机械制造有限公司 | Method of casting wear-resistant part of side blade by lost foam process |
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Legal Events
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150610 |