CN211276439U - Sand core for differential mechanism shell - Google Patents
Sand core for differential mechanism shell Download PDFInfo
- Publication number
- CN211276439U CN211276439U CN201922303210.9U CN201922303210U CN211276439U CN 211276439 U CN211276439 U CN 211276439U CN 201922303210 U CN201922303210 U CN 201922303210U CN 211276439 U CN211276439 U CN 211276439U
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- China
- Prior art keywords
- sand core
- core
- boss
- sand
- core body
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Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 6
- 238000005266 casting Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000000630 rising effect Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 230000006872 improvement Effects 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 6
- 239000004576 sand Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The utility model discloses a sand core for a differential mechanism shell, which relates to the technical field of automobile manufacturing and comprises a sand core body and a core cover; the bottom surface of the sand core body is a junction surface with the casting body, and the middle part of the bottom surface of the sand core body is provided with a sleeve riser; the depth of the sleeve riser is L, the diameter is D, and L: d is 1.2: 1; the core cover is arranged at the neck of the sleeve riser, and a core hole for communicating the sleeve riser is formed in the middle of the core cover. The utility model discloses an application of psammitolite and body faying face increase cover rising head structure, fine solution product shrinkage cavity, shrinkage porosity problem.
Description
Technical Field
The utility model relates to an automobile manufacturing technical field, specifically a psammitolite for differential mechanism casing.
Background
Referring to fig. 1, a conventional passenger vehicle differential case (nodular cast iron) is generally manufactured by a vertical parting box-free squeeze molding machine (green sand molding), the structure of the part is relatively complex, the quality and technical level of a casting is high, and casting defects such as shrinkage cavities and shrinkage porosity of an inner processing surface are not allowed. The two ends of the part are cylinders, and the whole body is connected by an arc surface with the wall thickness of 6 mm. When casting, the graphite of the casting liquid is separated out, the volume is expanded, the residual molten iron is increased, except that the yielding displacement of one part of the molten iron from the cavity wall is eliminated, the rest part of the molten iron flows back into a riser through a shell thin-wall liquid channel for storage, and when the molten iron needs to be supplemented by solidification and shrinkage, the thin-wall feeding channel is frozen due to the chilling of a sand tire of the cavity, so that feeding failure is caused, shrinkage cavities are formed at two ends, the shrinkage porosity probability is ultrahigh, and the rejection rate of castings caused by shrinkage cavities and shrinkage porosities is up to more than 35%.
SUMMERY OF THE UTILITY MODEL
To the defect that exists among the prior art, the utility model aims to provide a psammitolite for differential mechanism casing, fine solution product shrinkage cavity, shrinkage porosity problem.
In order to achieve the above purpose, the utility model adopts the technical proposal that: a sand core for a differential case comprises a sand core body and a core cover; the bottom surface of the sand core body is a combined surface with the casting body, and a sleeve riser is arranged in the middle of the bottom surface of the sand core body; the depth of the sleeve riser is L, the diameter of the sleeve riser is D, and L: d is 1.2: 1; the core cover is arranged at the neck of the sleeve riser, and a core hole for communicating the sleeve riser is formed in the middle of the core cover.
The further improvement lies in that: and a positioning blind hole is formed in the middle of the top surface of the sand core body.
The further improvement lies in that: two positioning grooves are oppositely arranged at the edge of the top surface of the sand core body, and the end parts of the positioning grooves extend to the positioning blind holes.
The further improvement lies in that: core grooves are oppositely arranged on the front side and the rear side of the sand core body.
The further improvement lies in that: the core groove is vertically provided with a convex rib.
The further improvement lies in that: a first boss is arranged on the left side of the sand core body, and a second boss is arranged on the right side of the sand core body; the first boss and the second boss are equal in height and lower than the sand core body.
The further improvement lies in that: the outer side of the first boss is provided with a first protruding portion, and the outer side of the second boss is provided with a second protruding portion.
The further improvement lies in that: the inner diameter of the core hole is smaller than the pre-processing aperture of the part.
The further improvement lies in that: the thickness of the core cover is 8 mm.
The beneficial effects of the utility model reside in that:
the utility model discloses in, increase the application of cover rising head structure through psammitolite and body faying face, fine solution product shrinkage cavity, shrinkage porosity problem, through many rounds of process verification and big batch volume production, this product is because of the waste product control that shrinkage cavity, shrinkage porosity produced is between 3-4.5% at present, product quality obtains effectively guaranteeing, and foundry goods quality cost reduces fast.
Drawings
FIG. 1 is a schematic illustration of the manufacture of a prior art differential case;
FIG. 2 is a top view of the sand core in an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic structural view of a core cover according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a core cap in an embodiment of the invention;
fig. 6 is a schematic view illustrating the manufacture of the differential case according to the embodiment of the present invention.
Reference numerals:
1-a sand core body; 11-sleeving a riser; 12-positioning blind holes; 13-positioning grooves; 14-core slot; 15-ribs;
2-core cover; 21-core hole;
3-a first boss; 31-a first boss;
4-a second boss; 41-second raised portion.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout.
In the description of the present invention, it should be noted that, for the orientation words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and the positional relationship are indicated based on the orientation or the positional relationship shown in the drawings, and the description is only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or the element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present invention.
Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and "a plurality" or "a plurality" in the description of the invention means two or more unless a specific definition is explicitly provided.
The technical solution and the advantages of the present invention will be more clear and clear by further describing the embodiments of the present invention with reference to the drawings of the specification. The embodiments described below are exemplary and are intended to be illustrative of the present invention, but should not be construed as limiting the invention.
Referring to fig. 2 and 3, an embodiment of the present invention provides a sand core for a differential case, including a sand core body 1 and a core cover 2; the bottom surface of the sand core body 1 is a joint surface with the casting body, and the middle part of the bottom surface of the sand core body 1 is provided with a sleeve riser 11; the depth of the sleeve riser 11 is L, the diameter is D, and L: d is 1.2: 1;
specifically, the middle of the top surface of the sand core body 1 is provided with a positioning blind hole 12. Two positioning grooves 13 are oppositely arranged at the edge of the top surface of the sand core body 1, and the end parts of the positioning grooves 13 extend to the positioning blind holes 12.
Specifically, the front and rear sides of the sand core body 1 are provided with core grooves 14 oppositely. The core groove 14 is vertically provided with a convex rib 15.
Specifically, a first boss 3 is arranged on the left side of the sand core body 1, and a second boss 4 is arranged on the right side of the sand core body 1; the first boss 3 and the second boss 4 are equal in height and lower than the sand core body 1. The first boss 3 is provided with a first boss 31 on the outer side thereof, and the second boss 4 is provided with a second boss 41 on the outer side thereof.
Referring to fig. 4 and 5, the core cap 2 is disposed at the neck of the feeder head 11, and a core hole 21 for communicating with the feeder head 11 is opened in the middle of the core cap 2. Specifically, the inner diameter of the core hole 21 is smaller than the prefabricated hole diameter of the part. In this embodiment, the thickness of the core lid 2 is 8 mm. The core cover is not suitable to be too thin or too thick, too thin, large in molten iron tension, easy to break, too thick and too fast in heat dissipation, and is not beneficial to forming shrinkage cavities. The core cap inside diameter D2 should be smaller than the part preparation bore diameter D1 to allow removal of risers during drilling.
The utility model discloses the theory of operation of psammitolite does:
referring to fig. 6, during the pouring operation of the automobile differential shell, the sand core is placed in a cavity of the sand type automobile differential shell body made of a mold, a long and thin cylindrical thermal joint is formed between the body and the central part of the sleeve riser when molten iron is poured, shrinkage cavities and shrinkage porosity are controlled to be the central parts as much as possible in the cooling process, and the shrinkage cavities are removed through cutting.
In the description of the specification, reference to the description of "one embodiment," "preferably," "an example," "a specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention, and schematic representations of the terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
With the above structure and principle in mind, those skilled in the art should understand that the present invention is not limited to the above embodiments, and all modifications and substitutions based on the present invention and adopting the known technology in the art are within the scope of the present invention, which should be limited by the claims.
Claims (9)
1. A psammitolite for differential mechanism casing, includes psammitolite body (1), its characterized in that: also comprises a core cover (2); the bottom surface of the sand core body (1) is a joint surface with the casting body, and a sleeve riser (11) is arranged in the middle of the bottom surface of the sand core body (1); the depth of the sleeve riser (11) is L, the diameter is D, and L: d is 1.2: 1; the core cover (2) is arranged at the neck of the sleeve riser (11), and a core hole (21) for communicating the sleeve riser (11) is formed in the middle of the core cover (2).
2. The sand core of claim 1, wherein: and a positioning blind hole (12) is formed in the middle of the top surface of the sand core body (1).
3. The sand core of claim 2, wherein: two positioning grooves (13) are oppositely arranged at the edge of the top surface of the sand core body (1), and the end parts of the positioning grooves (13) extend to the positioning blind holes (12).
4. The sand core of claim 1, wherein: core grooves (14) are oppositely arranged on the front side and the rear side of the sand core body (1).
5. The sand core of claim 4, wherein: the core groove (14) is internally and vertically provided with a convex rib (15).
6. The sand core of claim 1, wherein: a first boss (3) is arranged on the left side of the sand core body (1), and a second boss (4) is arranged on the right side of the sand core body (1); the first boss (3) and the second boss (4) are equal in height and lower than the sand core body (1).
7. The sand core of claim 6, wherein: the outer side of the first boss (3) is provided with a first boss (31), and the outer side of the second boss (4) is provided with a second boss (41).
8. The sand core of claim 1, wherein: the inner diameter of the core hole (21) is smaller than the prefabricated hole diameter of the part.
9. The sand core of claim 1, wherein: the thickness of the core cover (2) is 8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922303210.9U CN211276439U (en) | 2019-12-19 | 2019-12-19 | Sand core for differential mechanism shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922303210.9U CN211276439U (en) | 2019-12-19 | 2019-12-19 | Sand core for differential mechanism shell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211276439U true CN211276439U (en) | 2020-08-18 |
Family
ID=72038351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922303210.9U Expired - Fee Related CN211276439U (en) | 2019-12-19 | 2019-12-19 | Sand core for differential mechanism shell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211276439U (en) |
-
2019
- 2019-12-19 CN CN201922303210.9U patent/CN211276439U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200818 |