Differential shell casting loam core structure
By improving the differential shell casting mud core structure, adopting shaft head structure, inverted structure and hollow design, the problems of cold iron are easily broken and shrinked, low-cost and efficient casting are achieved, and casting quality and success rate are improved.
Patent Information
- Application Number
- CN202422046450.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-08-22
AI Technical Summary
In the casting of existing differential shells, the journal area is prone to shrinkage and loosening, and cold iron is prone to break at the contact surface of the mud core wrapped, resulting in a high waste rate of mud core material and increasing costs.
A differential shell cast mud core structure is designed, including an annular edge area and a central area. The central area is equipped with a shaft head structure and an inverted structure. The cold iron is inserted into the shaft head structure. The upper end of the cold iron is higher than the top end of the shaft head and the lower end is lower than the surface of the mud core. The hollow structure is designed, and the inverted structure is strengthened to combine, and the hollow structure reduces sand and reduces weight.
The waste rate of mud core material is reduced by 25%, the cost of raw materials is reduced, the cooling efficiency of castings is improved, the white mouth and stress concentration fracture is prevented, and the casting success rate is improved.
Smart Images
Figure CN223185491U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of differential casting, in particular to a differential housing casting mud core structure. Background Art
[0002] There is a car differential housing product. The mud core and chill required for its casting process are distributed as follows: Figure 7 As shown in the figure, the operating condition of the journal area of the casting is fatigue area, and internal shrinkage is not allowed; the journal area is relatively thick and large, and the outer edge of the inner cavity needs to be processed. According to the normal solidification sequence, this area belongs to the later solidification, which will produce an isolated liquid phase and thus form shrinkage; in order to solve the shrinkage in the thick journal area, it is necessary to change the solidification sequence here, so a chill is placed in the shaft hole to make it solidify first; however, the thickness of the chill at the wrapped contact surface of the mud core is only about 3.5 mm. During the core making process, this position is easily broken due to stress, and the scrap rate is about 25%; thereby increasing the scrap rate of the mud core material and increasing the cost. Utility Model Content
[0003] The purpose of the utility model is to provide a differential case casting mud core structure, which has the advantages of reducing mud core material waste rate and cost, effectively improving the success rate of existing differential case casting, and solving the problems in the prior art.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a differential case casting mud core structure, comprising: a mud core edge area and a mud core center area, the mud core edge area is annular, the mud core center area is provided in the middle of the mud core edge area, the top of the mud core center area is provided with an axle head structure, and undercut structures are symmetrically provided on both sides of the bottom end of the axle head structure, and the undercut structures and the axle head structure are connected to each other, the cold iron is inserted in the axle head structure, and the bottom end of the mud core center area is provided with a hollow structure.
[0005] Preferably, the outer diameter of the chill is adapted to the inner diameter of the shaft hole of the shaft head structure, the upper end surface of the chill is higher than the top end of the shaft head structure, and the lower end surface of the chill is lower than the surface of the central area of the mud core.
[0006] Preferably, undercut corners are symmetrically provided on both sides of the lower end surface of the chill, and the chill is tightly embedded in the interior of the undercut structure through the undercut corners.
[0007] Preferably, the shaft head structure and the hollow structure are not connected to each other, and a partition is provided between the two.
[0008] Preferably, the weight of the chill is 0.238 kg, the length of the chill is 54 mm, and the depth of the chill inserted into the shaft head structure is 34 mm.
[0009] Preferably, the outer diameter of the undercut angle is adapted to the inner diameter of the undercut structure.
[0010] Preferably, the lower opening diameter of the hollow structure is 40 mm, the upper opening diameter is 30 mm, and the internal height is 65 mm.
[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0012] The utility model provides a differential case casting mud core structure, which can accelerate the cooling of the casting by setting the size of the chill according to the size of the shaft hole in the shaft head structure, and at the same time make the upper end surface of the chill higher than the top end of the shaft head structure to avoid the formation of white spot at the end of the shaft head in the shaft head structure, which leads to metallographic unqualified; secondly, the lower end surface of the chill is lower than the surface of the central area of the mud core, so that the stress is shifted downward, and the stress concentration and fracture of the connection area during the core making process are prevented; furthermore, the mud core structure is relatively large, and the inner cavity of the central area of the mud core is a hollow structure, which makes it difficult to solidify and presents a loose sand state. The chill occupies more of the central area of the mud core, and the sand in the central area of the mud core is reduced as much as possible, which can facilitate the solidification of the mud core, reduce the weight of the central area of the mud core, and reduce the cost of raw materials; finally, an inverted structure is provided to make the chill tightly inserted into the shaft head structure, thereby strengthening the tightness of the combination of the chill and the mud core. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a three-dimensional schematic diagram of the mud core structure of the utility model;
[0014] Figure 2 This is a three-dimensional schematic diagram of the mud core structure of the utility model from another angle;
[0015] Figure 3 This is a top view schematic diagram of the mud core structure of the present utility model;
[0016] Figure 4 This is a schematic diagram of the bottom of the mud core structure of the present utility model;
[0017] Figure 5 This is a schematic cross-sectional view of the mud core structure of the present utility model;
[0018] Figure 6 This is a schematic cross-sectional view of the chiller structure of the present invention;
[0019] Figure 7 This is a distribution map of existing casting mud cores and chills.
[0020] In the figure: 1. Mud core edge area; 2. Mud core center area; 3. Axis head structure; 4. Undercut structure; 5. Chill; 6. Hollow structure; 51. Undercut angle. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0022] In order to solve the technical problem of shrinkage in thick areas of the journal in the prior art, the thickness of the chill 5 at the contact surface of the mud core is only about 3.5mm. This position is easily broken due to stress during the core making process, resulting in a scrap rate of about 25%. This increases the scrap rate of the mud core material and increases the cost. Figures 1-6 , this embodiment provides the following technical solutions:
[0023] A differential case casting mud core structure, comprising: a mud core edge area 1 and a mud core center area 2, wherein the mud core edge area 1 is annular, and the mud core center area 2 is provided in the middle of the mud core edge area 1, and the mud core edge area 1 and the mud core center area 2 form a complete mud core structure; an axle head structure 3 is provided at the top of the mud core center area 2, and the port of the axle head structure 3 protrudes from the surface of the mud core center area 2, and the surface of the mud core center area 2 is an easy-to-break surface, and the side wall of the port of the axle head structure 3 is a thick area of the shaft neck; undercut structures 4 are symmetrically provided on both sides of the bottom end of the axle head structure 3, and the undercut structure 4 is concave Angle, and the undercut structure 4 and the shaft head structure 3 are connected to each other, and the chill 5 is inserted into the shaft head structure 3; wherein, undercut angles 51 are symmetrically provided on both sides of the lower end surface of the chill 5, and the angle of the undercut angles 51 is 91 degrees, and the chill 5 is tightly embedded in the interior of the undercut structure 4 through the undercut angles 51, so the outer diameter of the undercut angle 51 is adapted to the inner diameter of the undercut structure 4, thereby strengthening the combination of the chill 5 and the mud core structure; the weight of the chill 5 is 0.238 kg, and its weight is improved to thereafter, each mud core structure can reduce the amount of coated sand by 0.15 kg, thereby reducing the curing time by 20 s; Since the diameter of the mud core center area 2 was 190mm in the past, the depth of the cold iron 5 inserted into the mud core center area 2 was 23mm. This size structure had the problems of fracture of the connecting surface of the shaft head structure 3 and difficulty in solidifying the sand inside the mud core center area 2; Therefore, the length of the improved cold iron 5 is 54mm, and the depth of the cold iron 5 inserted into the shaft head structure 3 is 34mm. The outer diameter of the cold iron 5 is adapted to the inner diameter of the shaft hole of the shaft head structure 3, and the upper end surface of the cold iron 5 is higher than the top end of the shaft head structure 3, so as to avoid the formation of white spots at the shaft head end of the shaft head structure 3, which leads to metallographic unqualified results; The cold iron The lower end surface of 5 is lower than the surface of the mud core center area 2, so that the stress is moved downward to prevent the stress concentration in the connection area during the core making process and fracture; a hollow structure 6 is provided at the bottom end of the mud core center area 2, and the shaft head structure 3 and the hollow structure 6 are not connected to each other, and a partition is provided between the two. The lower diameter of the hollow structure 6 is 40mm, the upper diameter is 30mm, and the internal height is 65mm. The design of the hollow structure 6 makes it difficult for the interior to solidify and present a loose sand state, thereby reducing the sand in the mud core center area 2 as much as possible, facilitating the solidification of the mud core, and at the same time reducing the weight of the mud core and reducing the cost.
[0024] Specifically, by setting the size of the chill 5 according to the size of the axial hole in the shaft head structure 3, it can not only play a role in accelerating the cooling of the casting, but also make the upper end surface of the chill 5 higher than the top end of the shaft head structure 3 to avoid the formation of white spots at the end of the shaft head in the shaft head structure 3, resulting in metallographic unqualified; secondly, the lower end surface of the chill 5 is lower than the surface of the mud core central area 2, so that the stress is moved downward, and the stress concentration and fracture in the connection area during the core making process are prevented; furthermore, the mud core structure is relatively large, and the inner cavity of the mud core central area 2 is a hollow structure 6, which makes it difficult to solidify and presents a loose sand state. The chill occupies more of the mud core central area 2, and the sand in the mud core central area 2 is reduced as much as possible, which can facilitate the solidification of the mud core, and can also reduce the weight of the mud core central area 2 and reduce the cost of raw materials; finally, the inverted structure 4 is set to make the chill 5 tightly inserted in the shaft head structure 3, thereby strengthening the tightness of the combination of the chill 5 and the mud core.
[0025] The beneficial effects achieved by the above content are: through the above operation, the connection area between the mud core structure and the cold iron 5 will not break due to thin walls, reducing the waste of mud core materials by 25%; the shaft head structure 3 is not prone to white spots, reducing the scrap rate of products with unqualified metallographic structures; the raw materials required in the mud core center area 2 are reduced, reducing the curing time and saving electricity consumption.
[0026] Working principle: By configuring the outer diameter of the chill 5 according to the inner diameter of the shaft head structure 3, the efficiency of cooling the casting is ensured; the top end of the chill 5 is higher than the top end of the shaft head structure 3, so that the chill 5 protrudes from the easy-to-break surface of the mud core structure, so as to avoid the formation of white spots at the end of the shaft head in the shaft head structure 3, which leads to metallographic unqualified; the lower end face of the chill 5 is sunk into the inside of the shaft head structure 3, so that the bottom end of the chill 5 is lower than the easy-to-break surface of the mud core structure, thereby moving the stress downward and preventing the stress concentration and fracture in the connection area during the core making process; the interior of the mud core center area 2 is designed as a hollow structure 6, which makes it difficult to solidify and presents a loose sand state, thereby reducing the sand in the mud core center area 2 as much as possible, which can facilitate the solidification of the mud core, and at the same time can reduce the weight of the mud core and reduce costs.
[0027] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.
[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A differential case casting mud core structure, comprising: The mud core edge area (1) and the mud core center area (2) are characterized in that: the mud core edge area (1) is annular, the mud core center area (2) is arranged in the middle of the mud core edge area (1), the top of the mud core center area (2) is provided with an axis head structure (3), the two sides of the bottom end of the axis head structure (3) are symmetrically provided with an inverted structure (4), and the inverted structure (4) and the axis head structure (3) are connected to each other, the cold iron (5) is inserted into the axis head structure (3), and the bottom end of the mud core center area (2) is provided with a hollow structure (6).
2. The differential case casting mud core structure according to claim 1, characterized in that: The outer diameter of the cold iron (5) is adapted to the inner diameter of the shaft hole of the shaft head structure (3), and the upper end surface of the cold iron (5) is higher than the top end of the shaft head structure (3), and the lower end surface of the cold iron (5) is lower than the surface of the mud core central area (2).
3. The differential case casting mud core structure according to claim 1, characterized in that: Undercut corners (51) are symmetrically provided on both sides of the lower end surface of the cold iron (5), and the cold iron (5) is tightly embedded in the interior of the undercut structure (4) through the undercut corners (51).
4. The differential case casting mud core structure according to claim 1, characterized in that: The shaft head structure (3) and the hollow structure (6) are not connected to each other, and a partition is provided between them.
5. The differential case casting mud core structure according to claim 1, characterized in that: The weight of the cold iron (5) is 0.238 kg, the length of the cold iron (5) is 54 mm, and the depth of the cold iron (5) inserted into the shaft head structure (3) is 34 mm.
6. The differential case casting mud core structure according to claim 3, characterized in that: The outer diameter of the undercut corner (51) is adapted to the inner diameter of the undercut structure (4).
7. The differential case casting mud core structure according to claim 1, characterized in that: The hollow structure (6) has a lower opening diameter of 40 mm, an upper opening diameter of 30 mm, and an internal height of 65 mm.