CN111468695A - Inner chill process for improving shrinkage porosity of vermicular iron cylinder cover - Google Patents
Inner chill process for improving shrinkage porosity of vermicular iron cylinder cover Download PDFInfo
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- CN111468695A CN111468695A CN202010447635.1A CN202010447635A CN111468695A CN 111468695 A CN111468695 A CN 111468695A CN 202010447635 A CN202010447635 A CN 202010447635A CN 111468695 A CN111468695 A CN 111468695A
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- chill
- internal
- casting
- internal chill
- cylinder cover
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
- B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
Abstract
The invention discloses an inner chill process for improving shrinkage porosity of a vermicular iron cylinder cover, which is characterized in that when the vermicular iron cylinder cover is produced, inner chill is used for chilling from the inside of a casting hot spot; the internal chill needs to be placed into a cavity and kept fixed during casting, and the internal chill and molten iron are fused into a whole during pouring; the internal chill is fused with the casting and is processed and removed during processing; placing the internal chill into the bolt hole part, and inserting the internal chill into the sand core base for fixing; placing the internal chill into the hole of the oil injector, wrapping the internal chill in a sand core during sand injection, and fusing the internal chill and the molten iron into a whole during casting; the material of the internal chill is low-carbon steel; the inner chill process used by the invention is to fix the inner chill made of low-carbon steel material at the center of the hot spot part by some modes, and directly chill from the center part which is easy to produce shrinkage porosity, thus having strong action effect and good chilling effect; compared with the existing chilling blocks in the industry, the chilling block has smaller volume and lighter weight, and is more convenient to use and logistics transport in the production process.
Description
Technical Field
The invention belongs to the technical field of casting, and relates to an inner chill process for improving shrinkage porosity of a vermicular iron cylinder cover.
Background
At present, the common problem of high-grade vermicular iron cylinder covers (the grade is higher than Rut400) is that the thick and large parts of structures such as an oil sprayer hole and a bolt hole are easy to produce shrinkage porosity casting defects, and the shrinkage porosity occurs in the cylinder covers, so that the defects can be found through air tightness detection after processing. The shrinkage porosity problem of the thick and large part of the structure is improved by a mode of feeding by a riser process and chilling by external chill in the current industry. The riser process is high in cost and different in applicability according to products, and the chilling effect of the external chill process on the central area of the thick and large part is limited, so that shrinkage porosity cannot be completely eliminated. The inner chill process is to fuse the inner chill made of low carbon steel material in the center of the oil injector hole and the bolt hole during casting, and the inner chill is chilled from the center, has strong chilling effect, has better effect on improving shrinkage porosity than a riser process and an outer chill process, and can be removed when the holes are drilled.
Due to the increase of the explosion pressure of the engine, the strength of the cylinder cover is correspondingly increased, the original gray iron material is changed into a vermicular iron material, and the current trend is to switch to the vermicular iron material. Due to the characteristic of pasty solidification, the central area of a thick and large part of a product structure is cooled at the latest, and shrinkage porosity defects are easily formed in the center of the product.
The process adopts the form of internal chill to chill from the center of a thick and large structure to eliminate the defect of shrinkage porosity, and the chill chilling processes similar to the process scheme have two types, namely conventional external chill chilling and chill using a chill sleeve, but chilling from the outside, which is different from the chilling from the inside of the process.
CN201610050168.2 discloses an internal chill sand core structure for a casting pattern, and a method for using the same, wherein the internal chill sand core structure for the casting pattern comprises an internal chill sand core which is bonded and fixed on a casting sand mold, an internal chill is embedded in the internal chill sand core, the internal chill corresponds to a position of the casting where shrinkage cavities and shrinkage porosity are likely to occur, and a core head is arranged at a position of the casting pattern corresponding to the bonded internal chill sand core and used for forming a cavity for accommodating the internal chill sand core when the casting pattern is molded. The structure of the internal chill sand core for the casting section mould is used for fixing the position of the internal chill through the internal chill sand core at the position where the internal chill needs to be designed in the improvement of the casting section mould, and the internal chill sand core is designed into a movable block form which can be bonded on the surface of a casting sand mould, so that the existing casting section mould structure is not needed to be damaged, the internal chill can be simply and flexibly added according to the requirement, and the accurate positioning of the internal chill is realized.
The core structure of the internal cooling iron of the CN201610050168.2 invention refers to a loose piece of internal cooling iron wrapped by a sand core, the essential principle of the core structure is the same as that of external cooling iron, and the core structure is not chilled from the inside and cannot be fused with a casting.
CN201410183211.3 discloses a method for casting a large and thick cast steel piece with internal chill, which comprises the following steps of ① determining the size and the adding amount of a steel shot and the adding time of the steel shot by a computer numerical simulation method, ② processing the steel shot, carrying out acid cleaning and drying on a processed blank steel shot to form a clean steel shot for standby, entering metal liquid into a casting cavity through a pouring channel when ③ is poured, adding the clean steel shot into the steel shot channel when the metal liquid reaches a certain height in the casting cavity, entering ④ the clean steel shot into the casting cavity, suspending the steel shot in the metal liquid under the action of gravity and the flowing action of the metal liquid, carrying out heat exchange with the surrounding metal liquid, rapidly heating the steel shot to the same temperature as the metal liquid, carrying out a certain metallurgical reaction on the metal liquid and the surface of the steel shot before the casting is not solidified, melting the surface of the steel shot, and combining the internal chill with the casting when the metal liquid is solidified.
The invention is applied to cast iron, the shape of which is cylindrical and is fixed in a cavity in advance, and the application fields and the structural principles of the cast iron and the cast iron are different.
CN201811539028.7 discloses an application of internal chill in an investment casting process, which relates to the technical field of casting processing application, and comprises the steps of opening a hole at a hot spot, preparing the internal chill, treating oil stain on the surface of the internal chill, removing rust on the surface of the internal chill, installing the internal chill, roasting a mould shell and casting steel. The beneficial effects are that: the small holes are processed at the independent hot spots of the product, the casting is sequentially solidified by adopting a precast chill mode, the problems of shrinkage cavity, shrinkage porosity, sinking and the like at the hot spots of the casting can be effectively solved, the number and the volume of risers can be reduced, and the yield of process products can be improved. By adopting the water glass to carry out rust removal treatment on the internal chill, the problems of high difficulty and high cost of the processes of tinning and bluing the internal chill are solved, and the problems that the internal chill can not be poured at once due to the influence of considerable conditions and is easy to rust after being kept in the air for a long time can be effectively solved.
The invention is applied to investment casting, is applied to sand casting, has different application fields, and is different from the principle of presetting internal chill in a sand core by processing small holes on a mould to preset the chill, wherein the principle is similar to that of external chill.
CN201610095494.5 discloses a process method for producing a qualified casting without shrinkage cavity and shrinkage porosity inside a dispersed thermal segment by using inner chill lost foam negative pressure casting. The method comprises the steps of selecting the material of the internal chill, determining the quality of the internal chill, preparing the internal chill, cleaning the internal chill, manufacturing a preset internal chill forming foam model, molding, pouring and solidifying to obtain a casting. The internal chill adopts a nickel plating wire structure which is the same as the material of the casting or is sold in the market, so that the internal chill with the same shape as the casting can be conveniently prepared. The inner chill adopts a structural form of combining a straight rod and winding, and the straight rod structure plays a role in fixing and supporting, so that the chill can be prevented from collapsing due to excessive mass and disappearing in a mold cavity. The internal chill has the advantages of simple structure, low cost, simple operation, strong reliability and strong applicability, and is suitable for castings cast and formed by the lost foam with dispersed heat nodes.
The invention is applied to investment casting and sand casting.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defect of insufficient chilling effect of a chilling block on a casting hot spot in the prior art, and provides an inner chilling block process for improving shrinkage porosity of a vermicular cast iron cylinder cover.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme, which is described by combining the accompanying drawings as follows:
an inner chill process for improving shrinkage porosity of a vermicular iron cylinder cover is characterized in that: when the vermicular iron cylinder cover is produced, the internal chill is used for chilling from the interior of the casting hot spot.
According to the technical scheme, the internal chill needs to be placed into a cavity and kept fixed during casting, and the internal chill and molten iron are fused into a whole during pouring.
In the technical scheme, the internal chill is fused with a casting and is machined and removed during machining.
According to the technical scheme, the internal chill is placed in the bolt hole position and is inserted into the sand core base for fixing.
According to the technical scheme, the internal chill is placed in a hole of the oil sprayer, the internal chill is wrapped in a sand core during sand shooting, and the internal chill and molten iron are fused into a whole during pouring.
In the technical scheme, the material of the internal chill is low-carbon steel.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the traditional chilling process, the chilling is from the inside of the hot joint to the outside, and the defect is generated in the center of the hot joint, so the method is more effective in improving the shrinkage porosity defect of the hot joint part of the casting.
2. Compared with the existing chilling blocks in the industry, the chilling block has smaller volume and lighter weight, and is more convenient to use and logistics transport in the production process.
3. The solidification form of the vermicular cast iron is pasty solidification, the outer layer of the cast part with thick wall is firstly solidified when the cast part is solidified, and the central part is finally solidified, so that the central part becomes an isolated liquid phase region. Because the shrinkage effect during solidification is easy to generate shrinkage and looseness defects at the central part, the cold iron process is usually adopted for improvement in casting. The chilling block has the functions of chilling the thick and large part, changing the temperature field of the thick and large part to accelerate cooling and reduce the shrinkage porosity tendency, but the traditional chilling block process has a general effect of improving the center of a heat node. The inner chill process used by the invention is to fix the inner chill made of low-carbon steel material at the center of the hot spot part by some modes, and directly chill from the center part which is easy to shrink loose, thus having strong action effect and good chilling effect.
4. The original shrinkage porosity of the tin diesel 6DM3 series vermicular cast iron diesel engine cylinder cover fuel injector hole is about 3.2%, and the shrinkage porosity can be eliminated by using an inner chill process in the fuel injector hole.
Drawings
The invention is further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of chilling inner chill of the process for improving shrinkage porosity of a vermicular iron cylinder cover according to the invention;
FIG. 2 is a schematic diagram of a conventional external chill quench;
FIG. 3 is a schematic diagram of chill jacket chilling;
FIG. 4 is a schematic diagram of the process for improving the internal chill of the creep iron cylinder cover shrinkage porosity, which is disclosed by the invention, wherein the internal chill is fixed on a sand core base;
in the figure: 1. casting hot spot; 2. internal chill; 3. external chill; 4. cooling the iron sleeve; 5. a sand core base;
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
referring to fig. 1, the schematic diagram of chilling of the internal chill of the process for improving the shrinkage porosity of the vermicular iron cylinder cover is a chilling process of the internal chill, and the implementation scheme is that the internal chill is fixed in a sand core, can be inserted into a reserved hole of the sand core or directly penetrates sand and wraps the sand core when the sand core is manufactured, so that the internal chill is placed in the center of a casting hot spot (usually a bolt hole, an oil sprayer hole and other holes), and is chilled outwards from the center of the hot spot in the pouring process, and the chilling effect is strong.
If process measures are not taken to perform feeding or chilling on the part of the casting hot spot 1 with the thick and large part of the casting structure in the casting solidification process, shrinkage porosity defects are easily formed after the casting is finally solidified,
the internal chill 2 chills the casting hot section 1 from the inside of the casting hot section 1 to the outside, and the chilling effect is strong.
Referring to fig. 2, a schematic diagram of a traditional external chill process is similar to the process of the invention, and the external chill chills the hot section of the casting from one side.
Referring to fig. 3, a schematic diagram of a chill sleeve process is shown, which is a process similar to the present invention, the chill sleeve is fixed outside the hot section of the casting and chills the hot section of the casting inwards, and the implementation method is to use the formed chill sleeve with the thickness of 1-2mm to be plugged into a sand core hole corresponding to the hot section of the casting, and chills inwards from the outer ring of the hot section of the casting, and the chilling effect is general.
Referring to fig. 4, the schematic diagram of the internal chill fixed to the sand core base in the process of improving the shrinkage porosity of the vermicular iron cylinder cover is shown, the schematic diagram of the internal chill fixed to the sand core base 5 is shown, a reserved hole is designed at the part of the sand core base 5 corresponding to the bolt hole, and the internal chill is fixed in an inserting mode.
The invention relates to a process for chilling inner chill from the inside of a hot spot in order to prevent the center of a thick large part of a casting from generating shrinkage and looseness defects when a vermicular iron cylinder cover is produced.
The casting implementation mode of the internal chill process for improving the shrinkage porosity of the vermicular iron cylinder cover is as follows:
the inner chill made of low-carbon steel needs to be placed into a cavity and kept fixed during casting, the inner chill and molten iron are fused into a whole during pouring, and the inner chill has a chilling effect on the thick and large part during the solidification of the molten iron, so that the solidification speed of the isolated liquid phase region in the center of the thick and large part is accelerated. The chill will fuse with the casting and be machined away during machining.
Referring to fig. 4, the internal chill is placed in the bolt hole position and inserted into the sand core base 5 for fixation, during casting, the internal chill and the molten iron are fused into a whole, and the internal chill has a chilling effect on the thick and large part during the solidification of the molten iron, so that the solidification speed of the thick and large part of the central isolated liquid phase region is accelerated. The chill will fuse with the casting and be machined away during machining.
And in the other realization mode, the internal chill is placed in the hole part of the oil injector, the internal chill is wrapped in the sand core during sand injection, the internal chill and the molten iron are fused into a whole during pouring, and the chilling effect is exerted on the thick part during the solidification of the molten iron, so that the solidification speed of the thick part in the central isolated liquid phase region is accelerated. The chill will fuse with the casting and be machined away during machining.
And those not described in detail in this specification are well within the skill of those in the art.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
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 (6)
1. An inner chill process for improving shrinkage porosity of a vermicular iron cylinder cover is characterized in that: when the vermicular iron cylinder cover is produced, the internal chill is used for chilling from the interior of the casting hot spot.
2. The process for improving the internal chill of the shrinkage porosity of a vermicular iron cylinder cover according to claim 1, which is characterized in that:
the internal chill needs to be placed into a cavity and kept fixed during casting, and the internal chill and molten iron are fused into a whole during pouring.
3. The process for improving the internal chill of the shrinkage porosity of a vermicular iron cylinder cover according to claim 2, which is characterized in that:
the internal chill is fused with the casting and is machined off during machining.
4. The process of the inner chill for improving shrinkage porosity of a vermicular iron cylinder cover according to claim 3, wherein the process comprises the following steps:
and the inner chill is placed in the bolt hole part and is inserted into the sand core base for fixing.
5. The process of the inner chill for improving shrinkage porosity of a vermicular iron cylinder cover according to claim 3, wherein the process comprises the following steps:
and the internal chill is placed in the hole part of the oil injector, is wrapped in the sand core during sand injection, and is fused with the molten iron to form a whole during pouring.
6. The process for improving the shrinkage porosity of a vermicular iron cylinder cover according to any one of claims 1 to 5, wherein the process comprises the following steps:
the material of the internal chill is low-carbon steel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010447635.1A CN111468695A (en) | 2020-05-25 | 2020-05-25 | Inner chill process for improving shrinkage porosity of vermicular iron cylinder cover |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010447635.1A CN111468695A (en) | 2020-05-25 | 2020-05-25 | Inner chill process for improving shrinkage porosity of vermicular iron cylinder cover |
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| CN111468695A true CN111468695A (en) | 2020-07-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111957891A (en) * | 2020-08-13 | 2020-11-20 | 山东泰山钢铁集团有限公司 | Manufacturing method of investment casting bidirectional pump impeller |
| CN113333684A (en) * | 2021-05-24 | 2021-09-03 | 东风锻造有限公司 | Process for solving shrinkage porosity of isolated hot node center of vertical casting cylinder cover by using graphite chill |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101130206A (en) * | 2006-08-21 | 2008-02-27 | 广西玉柴机器股份有限公司 | Method for casting vermicular cast iron casting parts |
| CN105063463A (en) * | 2015-09-10 | 2015-11-18 | 西安工业大学 | Preparation method of ductile/vermicular compound cast iron materials |
| CN109158570A (en) * | 2018-10-19 | 2019-01-08 | 淄柴动力有限公司 | Tin plate internal densener is for preventing and treating vermicular cast iron cylinder head shrinkage porosite method |
| CN110102712A (en) * | 2019-06-20 | 2019-08-09 | 淄柴动力有限公司 | The anti-shrinkage porosite casting method of cylinder head casting |
| CN110640088A (en) * | 2019-10-08 | 2020-01-03 | 一汽解放大连柴油机有限公司 | Process control method for shrinkage porosity defect of iron casting |
-
2020
- 2020-05-25 CN CN202010447635.1A patent/CN111468695A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101130206A (en) * | 2006-08-21 | 2008-02-27 | 广西玉柴机器股份有限公司 | Method for casting vermicular cast iron casting parts |
| CN105063463A (en) * | 2015-09-10 | 2015-11-18 | 西安工业大学 | Preparation method of ductile/vermicular compound cast iron materials |
| CN109158570A (en) * | 2018-10-19 | 2019-01-08 | 淄柴动力有限公司 | Tin plate internal densener is for preventing and treating vermicular cast iron cylinder head shrinkage porosite method |
| CN110102712A (en) * | 2019-06-20 | 2019-08-09 | 淄柴动力有限公司 | The anti-shrinkage porosite casting method of cylinder head casting |
| CN110640088A (en) * | 2019-10-08 | 2020-01-03 | 一汽解放大连柴油机有限公司 | Process control method for shrinkage porosity defect of iron casting |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111957891A (en) * | 2020-08-13 | 2020-11-20 | 山东泰山钢铁集团有限公司 | Manufacturing method of investment casting bidirectional pump impeller |
| CN113333684A (en) * | 2021-05-24 | 2021-09-03 | 东风锻造有限公司 | Process for solving shrinkage porosity of isolated hot node center of vertical casting cylinder cover by using graphite chill |
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Application publication date: 20200731 |
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