CN111940682A - Hot riser of automobile differential casing pin hole position does not have shrinkage cavity and does not have shrinkage porosity sand mould structure - Google Patents
Hot riser of automobile differential casing pin hole position does not have shrinkage cavity and does not have shrinkage porosity sand mould structure Download PDFInfo
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- CN111940682A CN111940682A CN202010973903.3A CN202010973903A CN111940682A CN 111940682 A CN111940682 A CN 111940682A CN 202010973903 A CN202010973903 A CN 202010973903A CN 111940682 A CN111940682 A CN 111940682A
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- 239000004576 sand Substances 0.000 title claims abstract description 47
- 230000000630 rising effect Effects 0.000 claims abstract description 21
- 238000007493 shaping process Methods 0.000 claims abstract description 3
- 238000005266 casting Methods 0.000 claims description 38
- 201000009240 nasopharyngitis Diseases 0.000 claims description 20
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 27
- 230000008569 process Effects 0.000 abstract description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 21
- 230000007547 defect Effects 0.000 description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 230000001502 supplementing effect Effects 0.000 description 6
- 230000000295 complement effect Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 239000003818 cinder Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/20—Stack moulds, i.e. arrangement of multiple moulds or flasks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The application discloses hot rising head of automobile differential casing pinhole position does not have shrinkage cavity and does not have shrinkage porosity sand mould structure, including the sand mould body, be formed with 8 foundry goods die cavities around arranging in proper order on the sand mould body, still include 8 interval set up in proper order in pinhole hot rising head between the foundry goods die cavity, every pinhole hot rising head is connected respectively in adjacent two the foundry goods die cavity, every round pin axle hot rising head department is formed with a mend psammitolite respectively, every the spindle nose position of foundry goods die cavity sets up 2 spindle nose cold rising heads respectively, the shaping of spindle nose cold rising head is in the step face of inner chamber mud core, every round pin axle hot rising head is connected respectively in an ingate, the ingate is connected in the cross gate, the cross gate overlap joint is in the filter screen base, the filter screen base is connected in. The invention has the advantages of meeting the requirements of shrinkage cavity and shrinkage porosity after product processing, improving the process yield and production efficiency, facilitating operation and reducing production cost.
Description
Technical Field
The application relates to the field of automobile part casting, in particular to a shrinkage cavity-free shrinkage porosity-free sand mold structure of a hot riser at a pin hole position of an automobile differential shell.
Background
The automobile differential shell is a platform product and can be applied to various automobile types, a client requires that a product has the defect of shrinkage porosity within a certain range, but the defect of shrinkage porosity is not allowed to exist in the positions of pin holes and shaft heads, the appearance requirement quality of the processed product is high, the processed product belongs to the platform product, and the high product quality requirement makes a production enterprise face a severe challenge.
The like products cast by the traditional process at present adopt a mode 1: the flange position of the casting cavity adopts a double-side riser process, a pin hole position chilling process and a shaft head position chilling process, the overlapped part of the outside of the chilling block and the casting adopts thick coating, and the defects of shrinkage cavity and shrinkage porosity at the pin hole position and the shaft head position are eliminated through chilling action of a chilling block electrode. Because the chilling block is irregular and is shape-following, the chilling block is difficult under the existence of the scheme, so that sand scraping is easily caused, the chilling block is difficult to separate from the casting body due to the falling risk of the chilling block coating, a special separating machine is required for separation, the operation is inconvenient, and the production is high. In the mode 2: the casting cavity flange position adopts the double-side riser process, the pin hole position mud core chilling process and the spindle nose position mud core package chilling process, the requirement that the pin hole position and the spindle nose position do not have the shrinkage cavity and shrinkage porosity defect is met, the core setting can be conveniently realized in the mode of packaging the chilling block by the mud core, the separation of the mud core coated by the package chilling block from the casting is also convenient, the chilling block is difficult to place when the core is manufactured, the production cost can be further increased after the mud core package chilling block, certain safety risk also exists when the chilling block is placed during the core manufacturing process, the production efficiency can be reduced, and meanwhile, the production labor cost of a company is greatly wasted.
Therefore, a new pouring system for the differential shell mold is needed to be designed, wherein the pouring system ensures the product quality, improves the process yield and the production efficiency, is convenient to operate and reduces the production cost.
Disclosure of Invention
The invention aims to provide a shrinkage-hole-free shrinkage-porosity-free sand mold structure of a hot riser at a pin hole position of a shell of an automobile differential, and the hot riser and a spindle head cold riser are adopted, so that the shrinkage-hole shrinkage-porosity requirement after the product is machined is met, the process yield and the production efficiency are improved, the operation is convenient, and the production cost is reduced.
In order to achieve the above object, the present invention provides the following technical solutions.
The embodiment of the application discloses hot rising head of automobile differential casing pinhole position does not have shrinkage cavity and does not have shrinkage porosity sand mould structure, including the sand mould body, be formed with 8 foundry goods die cavities around arranging in proper order on the sand mould body, still include 8 interval set up in proper order in pinhole hot rising head between the foundry goods die cavity, every pinhole hot rising head is connected respectively in adjacent two the foundry goods die cavity, every round pin axle hot rising head department is formed with a mend psammitolite respectively, every the spindle nose position of foundry goods die cavity sets up 2 spindle nose cold rising heads respectively, the shaping of spindle nose cold rising head is in the step face of inner chamber mud core, every round pin axle hot rising head is connected respectively in an ingate, the ingate is connected in the cross gate, the cross gate overlap joint is in the filter screen base, the filter screen base is connected.
Preferably, in the above-mentioned automotive differential case pin hole position thermal riser shrinkage-hole shrinkage-free sand mold structure, the neck position of the pin hole thermal riser is arranged at the pin hole position of the casting cavity.
Preferably, in the above-mentioned automobile differential case pin hole position hot riser shrinkage cavity-free shrinkage porosity-free sand mold structure, the runners include 4 first-level runners and 2 second-level runners, wherein 2 the ingates are respectively and directly connected to 1 first-level runner, and every 3 adjacent to the remaining 6 ingates are respectively connected to 1 second-level runner, and each second-level runner is respectively connected to 1 first-level runner, and 4 first-level runners are lapped on the filter screen base at the same time.
Preferably, in the above-mentioned automobile differential case pin hole position thermal riser shrinkage-free sand mold structure, the filter screen base adopts a ceramic filter screen with a size of 75 × 15 mm.
Preferably, in the automobile differential case pin hole position thermal riser shrinkage hole-free shrinkage porosity-free sand mold structure, the thickness of the sand supplementing core is at least 15mm, the lapping position of the sand supplementing core and the casting cavity is subjected to coating drying treatment, the concentration of the coating is set to Be 14-20Be, the drying temperature is 150 +/-10 ℃, and the drying time is 30 +/-10 min.
Preferably, in the above-mentioned structure, the pin hole position thermal riser has no shrinkage cavity and no shrinkage porosity, and the volume of the pin hole thermal riser is 550cm3The modulus of the pinhole hot riser is 12mm, and the volume of the shaft head cold riser is 200cm3And the modulus of the cold riser of the shaft head is 10 mm.
Preferably, in the above-mentioned structure, the cross-sectional area of the sprue flow-resisting channel is 240mm2。
Preferably, in the above-mentioned structure, the cross-sectional area of the sprue and the cross-runner is 625mm2The cross-sectional area of the flow resisting of the lap joint of the ingate and the secondary cross gate is 625mm2The flow-resisting sectional area of the first-stage transverse pouring gate is 800mm2。
Preferably, in the above-mentioned automobile differential case pin hole position hot riser shrinkage-hole shrinkage-free and shrinkage-porosity-free sand mold structure, the sand-making core weighs 0.35Kg, the thickness is at least 15mm, and the inner cavity mud core weighs 3.2 Kg.
Preferably, in the automobile differential case pin hole position thermal riser shrinkage-hole shrinkage-free sand mold structure, the flow blocking cross section area of the sprue is 2800mm2。
The invention has the advantages that: each two differential shell casting cavities share one pinhole hot riser, the pinhole hot risers are communicated with an ingate, the hot risers are adopted, pinhole hot risers are arranged at the positions of pinholes at two ends of the casting cavities, namely, 8 pinhole hot risers are totally arranged to meet the feeding at the positions of pinholes of 8 casting cavities, and simultaneously, in order to eliminate the defect of shrinkage cavity at the positions of differential shell spindle heads, two spindle head cold risers are arranged at the spindle head position of each casting cavity, namely, 16 spindle head cold risers are totally arranged to meet the feeding at the positions of the spindle heads of 8 casting cavities, the position of the pinhole hot riser neck is arranged at the position of the pinhole on the casting, due to the influence of the differential shell structure, the position of the pinhole cannot be directly provided with the riser, one sand core is required to meet the setting of the pinhole hot risers, each two casting cavities share one sand core, and 8 sand cores are required to meet the forming of the risers at the positions of the 8 casting, the 8 sand-complementing cores are designed reasonably, so that the shapes and the sizes of the sand-complementing cores are consistent, and sharing is realized; the axle head cold risers are arranged at the axle head position of the differential shell by reasonably utilizing the step surface of the inner cavity mud core, two axle head cold risers are arranged at the axle head position of each differential shell, the axle head cold risers are formed by the inner cavity mud core in an auxiliary mode, and the defect of shrinkage cavity and shrinkage porosity at the axle head position is overcome by arranging the axle head cold risers.
The invention can eliminate the defect of shrinkage cavity and shrinkage porosity in the machining of a pin hole of a differential shell by arranging the pin hole hot risers, replaces the mud core process target of two external chills or two packaged chills at the pin hole position, can eliminate the defect of shrinkage cavity and shrinkage porosity at the pin hole position by sharing the pin hole hot risers and simultaneously can improve the process yield, eliminates the defect of shrinkage cavity and shrinkage porosity in the machining of the pin head position by arranging the pin head cold risers at the pin head position, replaces the mud core process of the external chills or the packaged chills at the pin head position, buffers the flow velocity of molten iron by a twice lap joint mode, reduces the sand washing risk, finally achieves the aims of improving the quality of the differential shell casting, improving the process yield and the production efficiency and reducing the production cost.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a sand mold structure without shrinkage cavities and shrinkage porosity of pin hole position thermal risers of an automobile differential case in an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in 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 embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to FIG. 1, the automobile differential case pin hole position hot riser shrinkage cavity-free shrinkage porosity-free sand mold structure comprises a sand mold body 1, a casting cavity 2-9, pin hole hot risers 10-17, a spindle head cold riser 20-35, a sand supplementing core 36-43, an inner cavity mud core 44-51, an inner pouring gate 52-59, a secondary cross pouring gate 60-61, a primary cross pouring gate 62-65, a filter screen base 66 and a straight pouring gate 67; the sand mould body 1 is provided with 8 casting cavities 2-9, every two castings are combined into a group and share a pin hole hot riser, the pin hole hot risers are placed at the pin hole positions at the two ends of the casting cavity, namely, 8 pin hole hot risers are totally provided to meet the feeding at the pin hole positions of 8 casting cavities, and simultaneously, in order to eliminate the shrinkage cavity defect at the shaft head position of a differential shell, two shaft head cold risers are placed at the shaft head position of each casting cavity, namely, 16 shaft head cold risers are totally provided to meet the feeding at the shaft head positions of 8 casting cavities, the pin hole hot riser neck position is arranged at the pin hole position on the casting, due to the influence of the differential shell structure, the pin hole position can not be directly provided with the riser, a sand core for meeting the arrangement of the pin hole hot risers needs to be arranged, every two castings share a sand core, and 8 sand cores are totally needed to meet the forming at the pin hole, the 8 sand-complementing cores are designed reasonably, so that the shapes and the sizes of the sand-complementing cores are consistent, and sharing is realized; the axle head cold risers are arranged at the axle head position of the differential shell by reasonably utilizing the step surface of the inner cavity mud core, two axle head cold risers are arranged at the axle head position of each differential shell, the axle head cold risers are formed by the inner cavity mud core in an auxiliary mode, and the defect of shrinkage cavity and shrinkage porosity at the axle head position is overcome by arranging the axle head cold risers. The pin hole thermal risers 10-17 are communicated with the ingates 52-59, the ingates 52-53 are overlapped with the first-level cross runners 64-65, the ingates 54-59 are overlapped with the second-level cross runners 60-61, the second-level cross runners 60-61 are overlapped with the first-level cross runners 62-63, and molten iron flow resistance and buffering are realized through the overlapping of the first-level cross runners, the second-level cross runners and the ingates, so that the risk of sand buffering is reduced. All first-level cross runners 62-65 and filter screen base 66 overlap joint, and the filter screen base sets up the filter screen and filters the cinder hole and the choked flow, and the filter screen adopts size 75 x 15mm, adopts ceramic filter screen, and the filter screen base is connected into iron with sprue 67, and the filter screen base sets up the filter screen and filters the cinder hole and the choked flow, and the filter screen adopts size 75 x 15mm, adopts ceramic filter screen, 100csi specification.
Considering the requirement of strength, the thinnest thickness of the sand supplementing core 36-43 is designed to Be 15mm so as to meet the strength requirement of the mud core, when the sand supplementing core is used, coating materials are coated on the lapping position of the sand supplementing core and a casting and are dried, the concentration of the coating materials is set to Be 14-20Be, the drying temperature is 150 +/-10 ℃, and the drying time is 30 +/-10 min.
The pin hole thermal risers 10-17 are connected with the ingates 52-59 in an overlapping mode,the flow-resisting cross-sectional area of the ingates 52-59 is 240mm2. The ingates 52-53 overlap the primary runners 64-65 and the ingates 54-59 overlap and communicate with the secondary runners 60-61, preferably in a cope and drag flask manner.
The cross-sectional area of the flow-resisting of the lap joint of the ingates 52 to 53 and the first-stage cross runners 64 to 65 is 625mm2The cross-sectional area of the flow resisting of the lap joint of the ingates 54-59 and the secondary cross runners 60-61 is 625mm2The second-level cross runners 60-61 and the first-level cross runners 62-63 are lapped for the cope and drag flasks, and the flow blocking sectional area of the first-level cross runners 62-63 is 800mm2And the molten iron is choked and buffered through the lap joint of the primary transverse pouring gate, the secondary transverse pouring gate and the ingate, so that the risk of sand flushing is reduced.
And (3) placing corresponding inner cavity mud cores 44-51 and complementary sand cores 36-43 in each casting cavity 2-9, wherein the structures of the complementary sand cores are the same and consistent, the weight of each complementary sand core is 0.35Kg, the weight of each inner cavity mud core is 3.2Kg, and the complementary sand cores are designed in a planar structure, so that the thinnest thickness of the complementary sand cores is not less than 15mm for ensuring the strength and preventing deformation.
The flow-resisting sectional area of the sprue 67 was 2800mm2。
As a further improvement of the invention, the pinhole thermal riser is directly communicated with the pinhole of the differential shell through the sand-supplementing core, the casting modulus is 6.5mm (modulus = volume/surface area), the pinhole thermal riser modulus is 12mm, and the pinhole thermal riser volume is 550cm3,And the two castings share a pin hole hot riser; the cold risers of the shaft head are respectively lapped and fed with the shaft head of the differential shell casting through the mud core of the inner cavity, the cold risers of the shaft head are formed by the aid of the mud core, the cold modulus of the shaft head is 10mm, and the volume of the cold risers is 550cm3. The pin hole hot riser scheme replaces mud cores of two external chills or two wrapped chills at the pin hole position, and the axle head cold riser scheme replaces the mud core process of the external chills or the wrapped chills at the axle head position similarly, so that the requirement of internal shrinkage cavity and shrinkage porosity of a casting can be met, the process yield is improved, and the production cost is reduced.
By using the sand mold structure of the novel center riser feeding process for the automobile differential shell, 8 castings can be formed at one time when a differential shell casting is poured, and the conditions of internal quality and customer machining quality of shrinkage cavity and shrinkage porosity are met due to the reasonable design of the pin hole hot riser and the spindle head cold riser; the process yield of the product is improved to 44% from the original 35%, the production efficiency is improved to 8 parts/die from 6 parts/die, namely, the production efficiency is improved by 33.3%, the production efficiency is greatly improved, an external chill process or a chill-wrapping mud core process is not used, and the production cost and the operation difficulty are greatly reduced.
In conclusion, in the sand mold structure provided by the invention, 2 sand mold bodies share one pin hole hot riser, and meanwhile, each casting mold body uses two spindle head cold risers, so that the internal shrinkage cavity and shrinkage porosity and processing defects of a casting can be met on the premise that as few risers as possible and an external chill or a chill-wrapped mud core are eliminated, the process yield can be improved by more than 5%, the production efficiency is improved by 33.3%, and the production cost and the operation difficulty are reduced; therefore, the invention effectively overcomes the defects of the prior art and has high industrial utilization value.
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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (10)
1. The utility model provides an automobile differential casing pinhole position hot rising head does not have shrinkage cavity does not have shrinkage porosity sand mould structure, a serial communication port, including the sand mould body, it is formed with 8 foundry goods die cavities to center on arranging in proper order on the sand mould body, still include 8 interval set up in proper order pinhole hot rising head between the foundry goods die cavity, every pinhole hot rising head is connected respectively in adjacent two the foundry goods die cavity, every round pin axle hot rising head department is formed with a mend psammitolite respectively, every the spindle nose position of foundry goods die cavity sets up 2 spindle nose cold rising heads respectively, spindle nose cold rising head shaping is in the step face of inner chamber mud core, every round pin axle hot rising head is connected respectively in an ingate, the ingate is connected in the cross gate, the cross gate overlap joint is in the filter screen base, the filter.
2. The automotive differential case pin hole position thermal riser shrinkage-hole shrinkage-free sand mold structure according to claim 1, wherein the neck position of the pin hole thermal riser is arranged at the pin hole position of the casting cavity.
3. The automotive differential case pin hole position hot riser shrinkage cavity-free shrinkage porosity-free sand mold structure according to claim 1, wherein the runners comprise 4 primary runners and 2 secondary runners, wherein 2 of the runners are respectively and directly connected to 1 of the primary runners, every 3 of the rest 6 of the runners adjacent to the primary runner are respectively connected to 1 of the secondary runners, each of the secondary runners is respectively connected to 1 of the primary runners, and 4 of the primary runners are simultaneously lapped on the filter screen base.
4. The automotive differential case pin hole position thermal riser shrinkage-free sand mold structure according to claim 1, wherein the filter screen base is a ceramic filter screen with a size of 75 x 15 mm.
5. The automotive differential case pin hole position thermal riser shrinkage-hole shrinkage-free sand mold structure according to claim 1, wherein the thickness of the sand replenishment core is at least 15mm, the lapping position of the sand replenishment core and the casting cavity is subjected to coating drying treatment, the concentration of the coating is set to Be 14-20Be, the drying temperature is 150 +/-10 ℃, and the drying time is 30 +/-10 min.
6. The automotive differential case pin hole position thermal riser shrinkage-free sand mold structure according to claim 1, wherein the volume of the pin hole thermal riser is 550cm3The modulus of the pinhole hot riser is 12mm, and the volume of the shaft head cold riser is 200cm3And the modulus of the cold riser of the shaft head is 10 mm.
7. The automotive differential case pin hole position hot riser shrinkage-hole shrinkage-free sand mold structure according to claim 1, wherein the flow blocking cross-sectional area of the ingate is 240mm2。
8. The automotive differential case pin hole position hot riser shrinkage cavity-free shrinkage porosity-free sand mold structure according to claim 3, wherein the cross-sectional flow area of the lap joint of the ingate and the first-stage cross runner is 625mm2The cross-sectional area of the flow resisting of the lap joint of the ingate and the secondary cross gate is 625mm2The flow-resisting sectional area of the first-stage transverse pouring gate is 800mm2。
9. The automobile differential case pin hole position thermal riser shrinkage-hole shrinkage-free sand mold structure according to claim 1, wherein the sand-making core weighs 0.35Kg, has a thickness of at least 15mm, and the inner cavity mud core weighs 3.2 Kg.
10. The automotive differential case pin hole position thermal riser shrinkage-hole shrinkage-free sand mold structure according to claim 1, wherein the flow blocking cross-sectional area of the sprue is 2800mm2。
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| CN202010973903.3A CN111940682A (en) | 2020-09-16 | 2020-09-16 | Hot riser of automobile differential casing pin hole position does not have shrinkage cavity and does not have shrinkage porosity sand mould structure |
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| CN202010973903.3A CN111940682A (en) | 2020-09-16 | 2020-09-16 | Hot riser of automobile differential casing pin hole position does not have shrinkage cavity and does not have shrinkage porosity sand mould structure |
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| CN112872327A (en) * | 2021-01-12 | 2021-06-01 | 重庆擎一模具制造有限公司 | Low-pressure casting die |
| CN113523192A (en) * | 2021-06-23 | 2021-10-22 | 共享铸钢有限公司 | Casting method of ball valve body |
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| CN113523192A (en) * | 2021-06-23 | 2021-10-22 | 共享铸钢有限公司 | Casting method of ball valve body |
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