CN111085659A - Novel V-method composite casting process system - Google Patents
Novel V-method composite casting process system Download PDFInfo
- Publication number
- CN111085659A CN111085659A CN201911305158.9A CN201911305158A CN111085659A CN 111085659 A CN111085659 A CN 111085659A CN 201911305158 A CN201911305158 A CN 201911305158A CN 111085659 A CN111085659 A CN 111085659A
- Authority
- CN
- China
- Prior art keywords
- sand
- casting
- film
- box
- vacuum
- Prior art date
- 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.)
- Pending
Links
Classifications
-
- 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
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
Abstract
The invention discloses a V-method casting, namely vacuum sealing modeling, which is a production step of a novel V-method composite casting process system, and adopts the principle that a plastic film is utilized to seal a sand box, air in the mould is pumped out by a vacuum pump, pressure difference is formed between the inside and the outside of the mould, and dry sand is compacted to form a required cavity, the sand box is of a sandwich structure, the inner layer of the inner part of the sand box is provided with densely distributed small holes, a filter screen which can not permeate the dry sand is covered on the sand box, or a pumping filter pipe is arranged in a single-layer sand box, the bottom surface of the box is sealed with the upper plane of an air pumping box, so that the filtration can be effectively carried out, the dry sand can be repeatedly utilized, the mould drying is not needed, the coal consumption is reduced, but the power consumption is slightly increased due to the long-term vacuum machine operation, the dust is greatly reduced, the capital and, and in the casting process, harmful gas is less, and environment-friendly production is really realized.
Description
Technical Field
The invention belongs to the technical field related to industrial products, and particularly relates to a novel V-method composite casting process system.
Background
The V-method casting and the lost foam casting both adopt vacuum forming, but the technological processes of the two are greatly different, and the V-method casting has the greatest advantage that no adhesive is used, the V-method casting utilizes a plastic film to seal a sand box, air in the casting mould is pumped out by a vacuum pumping system, pressure difference exists between the inside and the outside of the casting mould, dry sand is compacted to form a required cavity, the casting is solidified by core setting, box closing, pouring and vacuum pumping, negative pressure is relieved, and the casting sand is scattered along with the casting mould to obtain the casting.
The prior novel V-method composite casting process system has the following problems: the method solves the problems that the sand in the prior V-method composite casting new process system is recycled for a long time when being processed and produced, and the damage of the pouring molten iron to the sand box filter screen is easy to damage, so that the sand is sucked into a vacuum pump to cause the damage.
Disclosure of Invention
The invention aims to provide a novel V-method composite casting process system to solve the problem that sand boxes in the conventional novel V-method composite casting process system in the background art can be damaged in the production process.
In order to achieve the purpose, the invention provides the following technical scheme: a new process system for V-method compound casting comprises the following production steps:
manufacturing a template with an air extraction box and an air extraction hole;
step two, covering the plastic film baked in a plastic state on a template and heating the plastic film at the temperature of 80-120 ℃ generally, and simultaneously, exhausting air by a vacuum pump to enable the film to be tightly attached to the template for molding;
thirdly, placing the sand box with the filtering and air extracting pipe on the template covered with the plastic film;
filling dry quartz sand with the granularity of 100 plus materials and 200 meshes, compacting and scraping the sand by slight shock, putting a sealing film, opening a valve and pumping air in the molding sand, so that pressure difference (about 300-400 mmHg) exists between the inside and the outside of the casting mold. The casting mold is molded under the action of pressure difference and has higher hardness, and the reading of a wet-type hardness meter can reach about 95;
and step five, releasing the vacuum in the template, and then performing die drawing. The mold continues to be evacuated until the cast article solidifies. Molding according to the above method;
sixthly, core setting, mould assembling and casting;
and step seven, after the metal is solidified, stopping exhausting the casting mold, and when the pressure in the mold is close to the atmospheric pressure, the casting mold automatically collapses.
Preferably, the production steps of the novel V-method composite casting process system are as follows:
firstly, the model puts the model on a hollow template, and the model is provided with a large number of vent holes which are helpful for leading the plastic film to be tightly attached to the model when the vacuum action is carried out.
Step two, heating the film
The plastic film with high stretching ratio and high plastic deformation ratio is heated and softened by a heater. The heating temperature is generally 80-120 ℃.
Step three, film forming
And covering the softened film on the surface layer of the model, and enabling the film to be tightly attached to the surface of the model through air holes under the vacuum suction of 200-400 mmHg.
Step four, sand box
After the paint is sprayed and dried, the special sand box is placed on the model covered with the film.
Step five, adding sand and compacting
Dry sand with good filling efficiency and granularity of 100-200 meshes is added into a sand box, and then micro-vibration is carried out to compact the sand to a higher density.
Step six, cover the mould
Opening the pouring cup, scraping the surface of the sand layer, and covering a plastic film to seal the sand box.
Step seven, drawing the die
The flask is evacuated to harden the mold under the action of atmospheric pressure by means of a film covering the surface of the flask. And releasing the vacuum of the negative pressure box during stripping, relieving the adsorption force of the template on the film, and then jacking the box to strip to complete the casting.
Step eight, mould assembling and pouring
Before mould assembling, core and chill can be placed according to the technological requirements, and the upper and lower moulds are combined together to form a casting mould with casting head and mould cavity, and then the casting mould is cast in the vacuum state.
Ninth step, knockout and shakeout
After a proper cooling time, the vacuum is removed and the normal pressure state is recovered, so that the free flowing sand flows out, and a clean casting without sand block and mechanical sand sticking is stored. The sand can be reused after being cooled.
Preferably, the novel V-process composite casting process system mainly considers the following factors:
step one, the size and the number of sand boxes which need to work under vacuum simultaneously;
step two, the number of casting molds which are poured simultaneously;
step three, casting size and shape;
step four, the permeability of the mold surface against the film controls the amount of air that enters the mold through the slit in the plastic film, thus necessitating the use of a small amount of mold coating during casting, which helps provide a secondary seal for the vacuum machine.
Compared with the prior art, the invention provides a novel anti-counterfeiting method, which has the following beneficial effects:
(1) the sand box is of a sandwich structure, the inner layer of the interior of the sand box is provided with densely distributed small holes, a filter screen which can not permeate dry sand is covered on the sand box, or a vacuumized filter pipe is arranged in the single-layer sand box, and the bottom surface of the box is sealed with the upper plane of the air extraction box, so that the filtering can be effectively carried out;
(2) the invention can repeatedly utilize the dry sand, does not need to be baked, reduces the coal consumption, but greatly reduces the dust and the manpower capital because the power consumption is slightly increased due to the long-term operation of the vacuum machine, ensures that the casting work is more effective, saves the labor force and greatly reduces the labor intensity, has less harmful gas in the pouring process, and really realizes the environment-friendly production.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that:
a new V-method compound casting process system comprises the following production steps:
manufacturing a template with an air extraction box and an air extraction hole;
step two, covering the plastic film baked in a plastic state on a template and heating the plastic film at the temperature of 80-120 ℃ generally, and simultaneously, exhausting air by a vacuum pump to enable the film to be tightly attached to the template for molding;
thirdly, placing the sand box with the filtering and air extracting pipe on the template covered with the plastic film;
filling dry quartz sand with the granularity of 100 plus materials and 200 meshes, compacting and scraping the sand by slight shock, putting a sealing film, opening a valve and pumping air in the molding sand, so that pressure difference (about 300-400 mmHg) exists between the inside and the outside of the casting mold. The casting mold is molded under the action of pressure difference and has higher hardness, and the reading of a wet-type hardness meter can reach about 95;
and step five, releasing the vacuum in the template, and then performing die drawing. The mold continues to be evacuated until the cast article solidifies. Molding according to the above method;
sixthly, core setting, mould assembling and casting;
and step seven, after the metal is solidified, stopping exhausting the casting mold, and when the pressure in the mold is close to the atmospheric pressure, the casting mold automatically collapses.
The production steps of the novel V-method composite casting process system are as follows:
firstly, the model puts the model on a hollow template, and the model is provided with a large number of vent holes which are helpful for leading the plastic film to be tightly attached to the model when the vacuum action is carried out.
Step two, heating the film
The plastic film with high stretching ratio and high plastic deformation ratio is heated and softened by a heater. The heating temperature is generally 80-120 ℃.
Step three, film forming
And covering the softened film on the surface layer of the model, and enabling the film to be tightly attached to the surface of the model through air holes under the vacuum suction of 200-400 mmHg.
Step four, sand box
After the paint is sprayed and dried, the special sand box is placed on the model covered with the film.
Step five, adding sand and compacting
Dry sand with good filling efficiency and granularity of 100-200 meshes is added into a sand box, and then micro-vibration is carried out to compact the sand to a higher density.
Step six, cover the mould
Opening the pouring cup, scraping the surface of the sand layer, and covering a plastic film to seal the sand box.
Step seven, drawing the die
The flask is evacuated to harden the mold under the action of atmospheric pressure by means of a film covering the surface of the flask. And releasing the vacuum of the negative pressure box during stripping, relieving the adsorption force of the template on the film, and then jacking the box to strip to complete the casting.
Step eight, mould assembling and pouring
Before mould assembling, core and chill can be placed according to the technological requirements, and the upper and lower moulds are combined together to form a casting mould with casting head and mould cavity, and then the casting mould is cast in the vacuum state.
Ninth step, knockout and shakeout
After a proper cooling time, the vacuum is removed and the normal pressure state is recovered, so that the free flowing sand flows out, and a clean casting without sand block and mechanical sand sticking is stored. The sand can be reused after being cooled.
The novel V-method composite casting process system mainly considers the following factors:
step one, the size and the number of sand boxes which need to work under vacuum simultaneously;
step two, the number of casting molds which are poured simultaneously;
step three, casting size and shape;
step four, the permeability of the mold surface against the film controls the amount of air that enters the mold through the slit in the plastic film, thus necessitating the use of a small amount of mold coating during casting, which helps provide a secondary seal for the vacuum machine.
The working principle and the using process of the invention are as follows:
the method comprises the following steps that firstly, a model is placed on a hollow template, a large number of air holes are formed in the model, a plurality of holes are formed in the model and connected with an air exhaust box, a plastic film softened by heating is adsorbed on the model through the air exhaust box and the small holes, and the holes are helpful for enabling the plastic film to be tightly attached to the model when the vacuum effect is achieved.
Step two, heating the film
The plastic film with high stretching ratio and high plastic deformation ratio is heated and softened by a heater. The heating temperature is generally 80-120 ℃.
Step three, film forming
And covering the softened film on the surface layer of the model, and enabling the film to be tightly attached to the surface of the model through air holes under the vacuum suction of 200-400 mmHg.
Step four, sand box
The sand box is of a sandwich structure, the inner layer of the sand box is provided with densely distributed small holes, a filter screen which can not permeate dry sand is covered on the sand box, or a vacuuming filter pipe is arranged in the single-layer sand box, and the bottom surface of the sand box is sealed with the upper plane of the extraction box;
after the paint is sprayed and dried, the special sand box is placed on the model covered with the film.
Step five, adding sand and compacting
And simultaneously slightly shaking to ensure that the dry sand is filled in the sand box model and each structural cavity. Strickling and placing the pouring cup, and covering the upper surface of the pouring cup with a thin film;
dry sand with good filling efficiency and granularity of 100-200 meshes is added into a sand box, and then micro-vibration is carried out to compact the sand to a higher density.
Step six, cover the mould
Sucking air to the casting mould through the interlayer and the built-in exhaust pipe, exhausting air to the bottom exhaust box, hardening the casting mould through the closing of the sand phase, the upper covering film and the lower plastic film through the atmospheric pressure, and finishing the casting film so as to form an upper mould, a lower mould and a mould core;
opening the pouring cup, scraping the surface of the sand layer, and covering a plastic film to seal the sand box.
Step seven, drawing the die
The flask is evacuated to harden the mold under the action of atmospheric pressure by means of a film covering the surface of the flask. And releasing the vacuum of the negative pressure box during stripping, relieving the adsorption force of the template on the film, and then jacking the box to strip to complete the casting.
Step eight, mould assembling and pouring
Before mould assembling, core and chill can be placed according to the technological requirements, and the upper and lower moulds are combined together to form a casting mould with casting head and mould cavity, and then the casting mould is cast in the vacuum state.
Ninth step, knockout and shakeout
After a proper cooling time, the vacuum is removed and the normal pressure state is recovered, so that the free flowing sand flows out, and a clean casting without sand block and mechanical sand sticking is stored. After the sand is cooled, the sand can be reused in the process from the fixed bottom box, and vacuum equipment is required to operate all the time. The vacuum degree in the sand mold and in the casting process of the common sand box should be kept at-0.053-0.08 MPa, and the vacuum pump is required to be at-0.053-0.08 MPa in the process, so SK and SZ are selected, and the series of water-ring vacuum pumps are most suitable. The pumping speed is higher in the vacuum degree range, and the pumping quantity is generally related to the size and the shape of the casting and the sealing of an upper box and a lower box.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A new V-method composite casting process system is characterized in that: the production steps of the novel V-method composite casting process system are as follows:
manufacturing a template with an air extraction box and an air extraction hole;
step two, covering the plastic film baked in a plastic state on a template and heating the plastic film at the temperature of 80-120 ℃ generally, and simultaneously, exhausting air by a vacuum pump to enable the film to be tightly attached to the template for molding;
thirdly, placing the sand box with the filtering and air extracting pipe on the template covered with the plastic film;
filling dry quartz sand with the granularity of 100 plus materials and 200 meshes, compacting and scraping the sand by slight shock, putting a sealing film, opening a valve and pumping air in the molding sand, so that pressure difference (about 300-400 mmHg) exists between the inside and the outside of the casting mold. The casting mold is molded under the action of pressure difference and has higher hardness, and the reading of a wet-type hardness meter can reach about 95;
and step five, releasing the vacuum in the template, and then performing die drawing. The mold continues to be evacuated until the cast article solidifies. Molding according to the above method;
sixthly, core setting, mould assembling and casting;
and step seven, after the metal is solidified, stopping exhausting the casting mold, and when the pressure in the mold is close to the atmospheric pressure, the casting mold automatically collapses.
2. A new V-method composite casting process system is characterized in that: the production steps of the novel V-method composite casting process system are as follows:
firstly, the model puts the model on a hollow template, and the model is provided with a large number of vent holes which are helpful for leading the plastic film to be tightly attached to the model when the vacuum action is carried out.
Step two, heating the film
The plastic film with high stretching ratio and high plastic deformation ratio is heated and softened by a heater. The heating temperature is generally 80-120 ℃.
Step three, film forming
And covering the softened film on the surface layer of the model, and enabling the film to be tightly attached to the surface of the model through air holes under the vacuum suction of 200-400 mmHg.
Step four, sand box
After the paint is sprayed and dried, the special sand box is placed on the model covered with the film.
Step five, adding sand and compacting
Dry sand with good filling efficiency and granularity of 100-200 meshes is added into a sand box, and then micro-vibration is carried out to compact the sand to a higher density.
Step six, cover the mould
Opening the pouring cup, scraping the surface of the sand layer, and covering a plastic film to seal the sand box.
Step seven, drawing the die
The flask is evacuated to harden the mold under the action of atmospheric pressure by means of a film covering the surface of the flask. And releasing the vacuum of the negative pressure box during stripping, relieving the adsorption force of the template on the film, and then jacking the box to strip to complete the casting.
Step eight, mould assembling and pouring
Before mould assembling, core and chill can be placed according to the technological requirements, and the upper and lower moulds are combined together to form a casting mould with casting head and mould cavity, and then the casting mould is cast in the vacuum state.
Ninth step, knockout and shakeout
After a proper cooling time, the vacuum is removed and the normal pressure state is recovered, so that the free flowing sand flows out, and a clean casting without sand block and mechanical sand sticking is stored. The sand can be reused after being cooled.
3. The new technological system for V-process composite casting according to claim 1, characterized in that: the novel V-method composite casting process system mainly considers the following factors:
step one, the size and the number of sand boxes which need to work under vacuum simultaneously;
step two, the number of casting molds which are poured simultaneously;
step three, casting size and shape;
step four, the permeability of the mold surface against the film controls the amount of air that enters the mold through the slit in the plastic film, thus necessitating the use of a small amount of mold coating during casting, which helps provide a secondary seal for the vacuum machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911305158.9A CN111085659A (en) | 2019-12-17 | 2019-12-17 | Novel V-method composite casting process system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911305158.9A CN111085659A (en) | 2019-12-17 | 2019-12-17 | Novel V-method composite casting process system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111085659A true CN111085659A (en) | 2020-05-01 |
Family
ID=70395089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911305158.9A Pending CN111085659A (en) | 2019-12-17 | 2019-12-17 | Novel V-method composite casting process system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111085659A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113976825A (en) * | 2021-10-19 | 2022-01-28 | 安徽合力(六安)铸造有限公司 | Vacuum casting row-connected movable air exhaust system |
| CN114273609A (en) * | 2020-12-01 | 2022-04-05 | 安阳市凯创科技有限公司 | Medium-large precision casting part shell casting technology |
| CN114472804A (en) * | 2022-02-11 | 2022-05-13 | 安徽合力股份有限公司合肥铸锻厂 | Process for casting rear seat of large-scale loader of ductile iron by V method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550848A (en) * | 2013-10-24 | 2015-04-29 | 青岛和德隆机械有限公司 | V-method vacuum casting technology |
| CN104550716A (en) * | 2014-12-05 | 2015-04-29 | 柳州市正龙机械制造有限公司 | V-method casting process |
| CN209465656U (en) * | 2019-01-08 | 2019-10-08 | 成都天成鑫业机械有限公司 | A kind of V method casting sand preparing system |
-
2019
- 2019-12-17 CN CN201911305158.9A patent/CN111085659A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550848A (en) * | 2013-10-24 | 2015-04-29 | 青岛和德隆机械有限公司 | V-method vacuum casting technology |
| CN104550716A (en) * | 2014-12-05 | 2015-04-29 | 柳州市正龙机械制造有限公司 | V-method casting process |
| CN209465656U (en) * | 2019-01-08 | 2019-10-08 | 成都天成鑫业机械有限公司 | A kind of V method casting sand preparing system |
Non-Patent Citations (2)
| Title |
|---|
| YUELIN30: "《V法铸造》", 《百度文库》 * |
| 曹CAOWEI888: "《真空负压铸造方法》", 《百度文库》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114273609A (en) * | 2020-12-01 | 2022-04-05 | 安阳市凯创科技有限公司 | Medium-large precision casting part shell casting technology |
| CN113976825A (en) * | 2021-10-19 | 2022-01-28 | 安徽合力(六安)铸造有限公司 | Vacuum casting row-connected movable air exhaust system |
| CN114472804A (en) * | 2022-02-11 | 2022-05-13 | 安徽合力股份有限公司合肥铸锻厂 | Process for casting rear seat of large-scale loader of ductile iron by V method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111085659A (en) | Novel V-method composite casting process system | |
| CN102717031B (en) | Large-scale thin-wall valve body lost foam casting process | |
| CN103212667B (en) | Production technology and the V method mould of application V method cast gear box casing | |
| CN102259165B (en) | Vacuum sealing core making method | |
| CN103586412B (en) | Method for casting ledges of middle troughs of scraper conveyer by V (vacuum) method | |
| CN103658525A (en) | V-method mold for casting electronic appliance mold casting blank | |
| CN104588581A (en) | Manufacturing method of brake drum | |
| CN102909348A (en) | Process for casting gearbox body of centrifugal compressor | |
| CN104439066A (en) | V-method casting process | |
| CN109290518B (en) | V-method vertical modeling process and casting process | |
| CN104325075A (en) | V method casting process | |
| CN106670385A (en) | V-method model casting process for casting household appliance base | |
| CN105382196A (en) | Casting process for preventing lost foam cast steel valve from cracking | |
| CN103658523B (en) | Process method for producing large size sculpture through resin sand removable-flask moulding | |
| CN104668460B (en) | A kind of wheel brake casting method | |
| CN103223465A (en) | Method for casting zinc alloy lost foam with low melting point | |
| CN115971451A (en) | Composite pouring process for vacuum shell type process blank holder feeding | |
| CN102274929B (en) | Method for preventing lost foam casting product from crushing | |
| CN114472804A (en) | Process for casting rear seat of large-scale loader of ductile iron by V method | |
| CN203061817U (en) | Air suction box for V method molding | |
| CN106734909A (en) | Lost foam casting process | |
| CN102310163A (en) | Lost foam casting method of engine gear chamber | |
| CN205684671U (en) | A kind of casting sandbox | |
| CN105728649A (en) | Casting process of iron casting | |
| CN105364008A (en) | Evaporative pattern casting process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200501 |
|
| WD01 | Invention patent application deemed withdrawn after publication |