CN110125332A - Automobile die material smelting technology - Google Patents
Automobile die material smelting technology Download PDFInfo
- Publication number
- CN110125332A CN110125332A CN201910435799.XA CN201910435799A CN110125332A CN 110125332 A CN110125332 A CN 110125332A CN 201910435799 A CN201910435799 A CN 201910435799A CN 110125332 A CN110125332 A CN 110125332A
- Authority
- CN
- China
- Prior art keywords
- mold
- sandbox
- smelting technology
- die material
- automobile die
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- 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
-
- 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
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Automobile die material smelting technology.It is related to automobile casting manufacturing process more particularly to automobile die material smelting technology.It can be drawn completely after providing a mold gasification, remain low automobile die material smelting technology.Include the following steps: that molten steel melts step, mold manufacturing step, sandbox loads step, casting forming step removes stress steps, by being embedded to pipeline in nice foundry sand while mold is embedded in nice foundry sand, and pipeline is divided into horizontal pipeline and pipe tunnel and suction can be made to be evenly distributed in the nice foundry sand in sandbox when drawing in this way, it is good to draw effect, remaining gas is few in nice foundry sand and casting in casting process, therefore gas bubbles left is few in casting.
Description
Technical field
The present invention relates to automobile casting manufacturing process more particularly to automobile die material smelting technologies.
Background technique
50 chrome molybdenum, 4 steel alloy is generally used to be cast in the metal casting of automobile for material, and simultaneously using easy
The plastic foam of gasification is that raw material makes mold, mold is embedded in the sandbox for filling nice foundry sand, by the molten steel of steel alloy melting
The high temperature of one side molten steel makes mold gasify in injection mold, leaves no trace, on the other hand by gas by way of vacuumizing
Gas extraction after change, prevents gas residue and forms aeration casting quality in casting, but tradition vacuumizes
Mode be by vacuum pump extract sandbox in gas.Although vacuum degree maintains between 0.4MPa ~ 0.6MPa, due to
Nice foundry sand is fine particle shape, therefore it is clean to be difficult to the gas extraction after gasifying by evacuator merely, influences casting quality.
Summary of the invention
For overcome the deficiencies in the prior art, clean the present invention provides that can be drawn after a kind of gasification of mold, it remains low
Automobile die material smelting technology.
The present invention adopts the following technical scheme that realization: automobile die material smelting technology, it is characterised in that: including walking as follows
It is rapid:
Molten steel melts step, and steel ingot is molten steel by high temperature melting by the molten steel fusing step；
Mold manufacturing step, plastic foam is made on demand becomes mold green body, equal using high-temperature resistant coating on the green body
Even production coating, is made mold finished product；
Sandbox loads step, mold finished product is placed in sandbox, uniform fold nice foundry sand, mold is entirely embedded in sandbox；
Molten steel is cast in mold via mouth is poured, mold is made to gasify to form die cavity by casting forming step, and molten steel fills die cavity
Form casting semi-finished product；
Stress steps are removed, casting semi-finished product is put into be cooled to room temperature after heating in baking oven and place into shot-blasting machine and is answered in removal
While power, the oxide layer of cast(ing) surface is removed.
Preferably, the steel ingot in the molten steel fusing step is 50 chrome molybdenum, 4 alloy steel ingot, and the temperature of the high temperature melting is
3000℃。
Preferably, need to carry out vacuum step after uniformly filling mold in the sandbox filling step, it is described to take out very
Empty step is vacuumized using evacuator, and the evacuator is evacuated by the vacuum port on sandbox.
Preferably, several pipelines are evenly equipped in the sandbox, the pipeline is placed in the nice foundry sand of sandbox and and vacuum port
Connection.
Preferably, the high-temperature resistant coating in the mold manufacturing step is the compounding in Guilin five, silica flour and water.
Preferably, the weight ratio of the Guilin five, silica flour and water is 0.8 ~ 1.2:19 ~ 21:8, and the silica flour is
150 mesh silica flours.
Preferably, the pipeline includes horizontal pipeline and the pipe tunnel that is connected to the horizontal pipeline, the longitudinal pipe
Road is vertical with the horizontal pipeline.
Compared with prior art, the present invention is while mold is embedded in nice foundry sand in nice foundry sand by being embedded to pipeline,
And pipeline is divided into horizontal pipeline and pipe tunnel and suction can be made to be evenly distributed in the treasured in sandbox when drawing in this way
In pearl sand, draw that effect is good, and remaining gas is few in nice foundry sand and casting in casting process, therefore gas bubbles left in casting
It is few.
Specific embodiment
In the following, be described further to the present invention in conjunction with the embodiments, it should be noted that under the premise of not colliding,
New embodiment can be formed between various embodiments described below or between each technical characteristic in any combination.
Automobile die material smelting technology, characterized by the following steps: molten steel melts step, the molten steel fusing
Steel ingot is molten steel by high temperature melting by step；Mold manufacturing step, plastic foam is made on demand becomes mold green body, in institute
It states and coating is uniformly made using high-temperature resistant coating on green body, mold finished product is made；Sandbox loads step, and mold finished product is placed on
In sandbox, mold is entirely embedded in sandbox by uniform fold nice foundry sand；Casting forming step pours molten steel via mouth is poured
In mold, mold is made to gasify to form die cavity, molten steel fills die cavity and forms casting semi-finished product.By the way that mold is being embedded in nice foundry sand
Pipeline is embedded to while middle in nice foundry sand, and pipeline is divided into horizontal pipeline and pipe tunnel and can make when drawing in this way
Suction is evenly distributed in the nice foundry sand in sandbox, and it is good to draw effect, remaining in nice foundry sand and casting in casting process
Gas is few, therefore gas bubbles left is few in casting.
Stress steps are removed, casting semi-finished product is put into be cooled to room temperature after heating in baking oven and place into shot-blasting machine and is being gone
While de-stress, the oxide layer of cast(ing) surface is removed.
There are certain temper brittleness, temper brittleness refers to for a long time in 370 DEG C of -595 DEG C of temperature ranges 50 chrome molybdenum, 4 steel alloy
The phenomenon that impact toughness decreased can be generated when interior operation.And our common hydrogen-contacting equipments just long-term work in this temperature model
In enclosing.Show in the common chromium aluminum steel of pressure vessel according to experimental study, the temper embrittlement tendency that amount containing Cr is 2%-3% is the tightest
Weight.Influence of the elements such as P, Sb, Sn, As, Si, Mn to temper brittleness is bigger.Embrittlement is reversible, serious embrittlement
Material can be taken off crisp by heat treatment appropriate.Therefore it needs to be heat-treated to be placed in baking oven after the completion of casting to heat
It carries out taking off processing that is crisp and eliminating stress.
Preferably, the steel ingot in the molten steel fusing step is 50 chrome molybdenum, 4 alloy steel ingot, and the temperature of the high temperature melting is
3000℃.The addition of the elements such as chromium, aluminium, rock effectively raises the performance and elevated temperature strength of steel resistance to high temperature oxidation, effect
Mechanism is as follows: chromium is primarily present in cementite (Fe3C), and the chromium being dissolved in cementite improves the decomposition temperature of carbide,
The generation of graphitization phenomenon is prevented, and then improves the heat resistance of steel.Aluminium has solution strengthening effect to ferrite, while
The stability of carbide can be improved, therefore advantageous to the elevated temperature strength for improving steel.The addition of appropriate vanadium can make steel in higher temperatures
Fine grain structure is kept when spending, and improves the thermal stability and intensity of steel.
The elements such as chromium, aluminium improve the stability of carbide, prevent the decomposition of carbide, reduce carbide and precipitation
Carbon and hydrogen reaction generate methane chance.The addition of vanadium can make steel keep fine grain structure in higher temperature, significantly
Steel is increased at high temperature under high pressure to the stability of hydrogen.
Need to carry out vacuum step after uniformly filling mold in the sandbox filling step, the vacuum step is adopted
It is vacuumized with evacuator, the evacuator is evacuated by the vacuum port on sandbox.It is evenly equipped in the sandbox several
Pipeline, the pipeline are placed in the nice foundry sand of sandbox and are connected to vacuum port.The pipeline include horizontal pipeline and with the cross
The pipe tunnel being connected to pipeline, the pipe tunnel are vertical with the horizontal pipeline.
By being embedded to pipeline in nice foundry sand while mold is embedded in nice foundry sand, and pipeline be divided into horizontal pipeline and
Pipe tunnel can be such that suction is evenly distributed in the nice foundry sand in sandbox when drawing in this way, and absorption effect is good,
Remaining gas is few in nice foundry sand and casting in casting process, therefore gas bubbles left is few in casting.
High-temperature resistant coating in the mold manufacturing step is the compounding in Guilin five, silica flour and water.Preferably, described
The weight ratio in Guilin five, silica flour and water is 0.8 ~ 1.2:19 ~ 21:8, and the silica flour is 150 mesh silica flours.This coating
It is uniformly coated in die surface, coating layer thickness 1.5mm ~ 3mm is able to maintain good permeability and rigidity and heat-resisting quantity
Can be good, therefore in vacuum die cavity can be kept when molten steel is perfused using with a thickness of the coating of 1.5mm ~ 3mm
Stablize and be both that the gas generated when molten steel gasifies mold can effectively be discharged in nice foundry sand via coating and be convenient for
It absorbs.
The above embodiment is only the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited thereto,
The variation and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed range.
Claims (7)
1. automobile die material smelting technology, characterized by the following steps:
Molten steel melts step, and steel ingot is molten steel by high temperature melting by the molten steel fusing step；
Mold manufacturing step, plastic foam is made on demand becomes mold green body, equal using high-temperature resistant coating on the green body
Even production coating, is made mold finished product；
Sandbox loads step, mold finished product is placed in sandbox, uniform fold nice foundry sand, mold is entirely embedded in sandbox；
Molten steel is cast in mold via mouth is poured, mold is made to gasify to form die cavity by casting forming step, and molten steel fills die cavity
Form casting semi-finished product；
Stress steps are removed, casting semi-finished product is put into be cooled to room temperature after heating in baking oven and place into shot-blasting machine and is answered in removal
While power, the oxide layer of cast(ing) surface is removed.
2. automobile die material smelting technology according to claim 1, it is characterised in that: the steel in the molten steel fusing step
Ingot is 50 chrome molybdenum, 4 alloy steel ingot, and the temperature of the high temperature melting is 3000 DEG C.
3. automobile die material smelting technology according to claim 1, it is characterised in that: by mould in the sandbox filling step
Tool needs to carry out vacuum step after uniformly filling, the vacuum step is vacuumized using evacuator, and the pumping is true
Empty machine is evacuated by the vacuum port on sandbox.
4. automobile die material smelting technology according to claim 3, it is characterised in that: if being evenly equipped with main pipe in the sandbox
Road, the pipeline are placed in the nice foundry sand of sandbox and are connected to vacuum port.
5. automobile die material smelting technology according to claim 1, it is characterised in that: resistance in the mold manufacturing step
High-temperature coatings are the compounding in Guilin five, silica flour and water.
6. automobile die material smelting technology according to claim 5, it is characterised in that: the Guilin five, silica flour and
The weight ratio of water is 0.8 ~ 1.2:19 ~ 21:8, and the silica flour is 150 mesh silica flours.
7. automobile die material smelting technology according to claim 5, it is characterised in that: the pipeline include horizontal pipeline and
The pipe tunnel being connected to the horizontal pipeline, the pipe tunnel are vertical with the horizontal pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910435799.XA CN110125332A (en) | 2019-05-23 | 2019-05-23 | Automobile die material smelting technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910435799.XA CN110125332A (en) | 2019-05-23 | 2019-05-23 | Automobile die material smelting technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110125332A true CN110125332A (en) | 2019-08-16 |
Family
ID=67572859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910435799.XA Pending CN110125332A (en) | 2019-05-23 | 2019-05-23 | Automobile die material smelting technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110125332A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114558985A (en) * | 2022-01-25 | 2022-05-31 | 繁昌县金科机电科技股份有限公司 | Valve body casting equipment and casting process thereof |
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| CN103273007A (en) * | 2013-05-16 | 2013-09-04 | 重庆汉华汽车零部件制造有限公司 | Casting technique of V12-type engine cylinder block |
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Cited By (1)
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|---|---|---|---|---|
| CN114558985A (en) * | 2022-01-25 | 2022-05-31 | 繁昌县金科机电科技股份有限公司 | Valve body casting equipment and casting process thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190816 |