Sand mold structure of split type differential mechanism shell of automobile
By designing the sand mold structure of the automobile split differential housing and setting up a primary sprue, a secondary sprue and a cold needle, the existing technology solves the problem of processing shrinkage in the R corner area of the differential housing and the difficulty in meeting quality requirements. problems, achieving the goal of improving appearance and interior quality.
Patent Information
- Application Number
- CN202420300452.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-19
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-02-19
AI Technical Summary
The prior art is difficult to meet the requirements of high appearance quality and internal quality at the sample development and mass production stage of automobile differential housing, especially the defects of processing and shrinkage in the R-angle area of the differential housing are difficult to eliminate, and the process yield is decline.
A sand mold structure of an automobile split differential housing is designed, which includes a sand mold body and a pair of casting cavities. A primary sprue and a secondary sprue are provided, and a cold needle is set on the back of the R corner of the differential housing. , improve the appearance and internal quality through the overlap of cold needle grinding bosses and lateral sprues.
It effectively eliminates the processing shrinkage defect in the R corner area of the differential housing, improves the appearance and internal quality of the differential housing, reduces production costs, and improves process yield.
Smart Images
Figure CN222370302U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of automobile parts casting, in particular to a sand mold structure of an automobile split differential housing. Background Art
[0002] The automotive differential housing can be used in many models. The differential housing is designed with a diameter of 213mm and a unit weight of 6.9kg. The overall design thickness of the product is relatively large. In the early development stage, the client has very high requirements for the appearance quality and internal quality of the differential housing. The goal of the sample development stage is to require that the machined surface does not exceed 0.3mm defects. After mass production, a single defect with a maximum diameter of 0.5mm is allowed. Both the sample stage and the mass production stage require that internal defects meet the requirements of ASTM E446 Level 2. The appearance quality requirements of the machined surface are very high. Such high quality requirements from customers pose severe technical challenges to manufacturers.
[0003] Based on conventional process design, for the differential housing with a diameter of 213mm, the conventional layout process of the DISA line (size 675*540mm) adopts a four-riser process. The four-riser process can eliminate the risk of shrinkage exposure at the four lock pin hole positions, but it cannot eliminate the risk of shrinkage exposure in the R corner area of the differential housing, and it leads to a decrease in the process yield. At the same time, based on the traditional casting process, it cannot stably meet the requirements of 0 defects on the processing surface in the sample stage and a maximum single defect diameter of 0.5mm after mass production. Utility Model Content
[0004] The utility model aims to provide a sand mold structure of a split differential housing of an automobile, so as to overcome the deficiencies in the prior art.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] The embodiment of the present application discloses a sand mold structure of a split differential case for an automobile, comprising a sand mold body and a pair of casting cavities, characterized in that a primary straight runner is provided on the sand mold body between the pair of casting cavities, each of the casting cavities is connected with a single riser, the single riser is connected to the casting cavity through a secondary straight runner, the primary straight runner is connected to the secondary straight runner through a first horizontal runner and a second horizontal runner, and a cold pin is provided on the back side of the R corner of the casting cavity.
[0007] Preferably, in the above-mentioned sand mold structure of a split differential housing for an automobile, an exhaust plate is provided on the single riser, the cross-sectional area of the exhaust plate is 40 mm², the thickness of the exhaust plate is 5 mm, and the exhaust plate is curved.
[0008] Preferably, in the above-mentioned sand mold structure of the split differential housing of an automobile, a grinding boss is provided at the bottom of the cold pin, the grinding boss height is 1 mm, and the draft angle of the cold pin is 3°.
[0009] Preferably, in the above-mentioned sand mold structure of a split differential housing for an automobile, the single riser is arranged between the window of the casting cavity and the lock pin hole.
[0010] Preferably, in the above-mentioned sand mold structure of a split differential case of an automobile, the first-level straight runner includes a first section, a second section and a third section connected in sequence, the second-level straight runner includes a fourth section, a fifth section, a sixth section and a seventh section connected in sequence, the fourth section is connected to the single riser, the seventh section is connected to the casting cavity, the second section is connected to the fourth section through the first cross runner, and the third section is connected to the fifth section through the second cross runner.
[0011] Preferably, in the above-mentioned sand mold structure of a split differential case of an automobile, the flow-blocking cross-sectional area of the first section and the second section is 505mm², the flow-blocking cross-sectional area of the third section is 455mm², the flow-blocking cross-sectional area of the fourth section is 100mm², the flow-blocking cross-sectional area of the fifth section is 350mm², the flow-blocking cross-sectional area of the sixth section is 390mm², and the flow-blocking cross-sectional area of the seventh section is 220mm².
[0012] Preferably, in the above-mentioned sand mold structure of the split differential case of an automobile, the fifth section, the sixth section and the seventh section are vertically arranged in sequence.
[0013] Preferably, in the above-mentioned sand mold structure of a split differential housing for an automobile, a slag collecting groove is provided on the third section and the fifth section, and a separation block is provided on the sixth section.
[0014] Compared with the prior art, the advantages of the utility model are:
[0015] The riser is set between the window and the locking pin hole of the differential case. In order to eliminate the defect of shrinkage in the R angle area of the differential case near the riser, a cold pin is set on the back of the R angle of the differential case. In order to ensure the grinding of the cold pin, a 1mm grinding boss is set at the root of the cold pin. The first-level sprue itself is provided with a secondary overlap. The first-level sprue and the second-level sprue are overlapped by two thin plate cross runners and two sprue slag troughs, which ultimately achieves the goal of improving the appearance quality and internal quality of the differential case and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, it is easy to obtain other drawings based on these drawings without creative work.
[0017] Figure 1 Shown is a schematic structural diagram of a sand mold structure of a split differential housing for an automobile in a specific embodiment of the utility model. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the utility model to describe the technical solutions in the embodiments of the utility model in detail. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0019] Ginseng Figure 1 As shown, the sand mold structure of the automobile split differential housing in this embodiment includes a sand mold body 1 and a pair of casting cavities 2. A primary sprue 3 is provided on the sand mold body 1 between the pair of casting cavities 2. Each casting cavity 2 is connected with a single riser 4, and the single riser 4 is connected to the casting cavity 2 through a secondary sprue 5. The primary sprue 3 is connected to the secondary sprue 5 through a first cross runner 6 and a second cross runner 7. A cold pin 8 is provided on the back of the R corner of the casting cavity 2.
[0020] Furthermore, an exhaust plate 9 is provided on the single riser 4, the cross-sectional area of the exhaust plate 9 is 40 mm², the thickness of the exhaust plate 9 is 5 mm, and the exhaust plate 9 is curved.
[0021] Furthermore, a grinding boss 801 is provided at the bottom of the cold needle 8, the height of the grinding boss 801 is 1 mm, and the draft angle of the cold needle 8 is 3°.
[0022] Furthermore, the single riser 4 is arranged between the window of the casting cavity 2 and the locking pin hole.
[0023] Furthermore, the first-level straight runner 3 includes a first section 301, a second section 302 and a third section 303 connected in sequence, and the second-level straight runner 5 includes a fourth section 501, a fifth section 502, a sixth section 503 and a seventh section 504 connected in sequence, the fourth section 501 is connected to the single riser 4, the seventh section 504 is connected to the casting cavity 2, the second section 302 is connected to the fourth section 501 through the first cross runner 6, and the third section 303 is connected to the fifth section 502 through the second cross runner 7.
[0024] Furthermore, the flow-blocking cross-sectional area of the first section 301 and the second section 302 is 505 mm², the flow-blocking cross-sectional area of the third section 303 is 455 mm², the flow-blocking cross-sectional area of the fourth section 501 is 100 mm², the flow-blocking cross-sectional area of the fifth section 502 is 350 mm², the flow-blocking cross-sectional area of the sixth section 503 is 390 mm², and the flow-blocking cross-sectional area of the seventh section 504 is 220 mm².
[0025] Furthermore, the fifth section 502, the sixth section 503 and the seventh section 504 are vertically arranged in sequence.
[0026] Furthermore, a slag collecting trough 10 is provided on the third section 303 and the fifth section 502 , and a separation block 11 is provided on the sixth section 503 .
[0027] In this technical solution, the riser is arranged between the window and the locking pin hole of the differential housing. In order to eliminate the defect of shrinkage in the R angle area of the differential housing near the riser, a cold pin is arranged on the back of the R angle of the differential housing. In order to ensure the grinding of the cold pin, a 1mm grinding boss is arranged at the root of the cold pin. The first-level sprue itself is provided with a secondary overlap. The first-level sprue and the second-level sprue are overlapped by two thin plate cross runners and two sprue slag troughs, thereby finally achieving the goal of improving the appearance quality and internal quality of the differential housing and reducing the production cost.
[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0029] The above is only a specific implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.
Claims
1. A sand mold structure of a split differential housing for an automobile, comprising a sand mold body and a pair of casting cavities, characterized in that: A primary straight runner is provided on the sand mold body between a pair of the casting cavities, and each of the casting cavities is connected with a single riser, which is connected to the casting cavity through a secondary straight runner, and the primary straight runner is connected to the secondary straight runner through a first horizontal runner and a second horizontal runner, and a cold pin is provided on the back of the R corner of the casting cavity.
2. The sand mold structure of a split differential case for an automobile according to claim 1, characterized in that: The single riser is provided with an exhaust plate, the cross-sectional area of the exhaust plate is 40 mm², the thickness of the exhaust plate is 5 mm, and the exhaust plate is curved.
3. The sand mold structure of a split differential case for an automobile according to claim 1, characterized in that: A grinding boss is provided at the bottom of the cold needle, the height of the grinding boss is 1 mm, and the draft angle of the cold needle is 3°.
4. The sand mold structure of a split differential case for an automobile according to claim 1, characterized in that: The single riser is arranged between the window of the casting cavity and the locking pin hole.
5. The sand mold structure of a split differential case for an automobile according to claim 1, characterized in that: The primary straight runner includes a first section, a second section and a third section connected in sequence, and the secondary straight runner includes a fourth section, a fifth section, a sixth section and a seventh section connected in sequence, the fourth section is connected to the single riser, the seventh section is connected to the casting cavity, the second section is connected to the fourth section through the first cross runner, and the third section is connected to the fifth section through the second cross runner.
6. The sand mold structure of a split differential housing for an automobile according to claim 5, characterized in that: The flow-blocking cross-sectional area of the first section and the second section is 505mm², the flow-blocking cross-sectional area of the third section is 455mm², the flow-blocking cross-sectional area of the fourth section is 100mm², the flow-blocking cross-sectional area of the fifth section is 350mm², the flow-blocking cross-sectional area of the sixth section is 390mm², and the flow-blocking cross-sectional area of the seventh section is 220mm².
7. The sand mold structure of a split differential case for an automobile according to claim 5, characterized in that: The fifth section, the sixth section and the seventh section are vertically arranged in sequence.
8. The sand mold structure of a split differential case for an automobile according to claim 5, characterized in that: The third section and the fifth section are both provided with slag collecting grooves, and the sixth section is provided with a separation block.