Differential shell blank with riser neck away from positioning face and casting mold for producing differential shell blank

Abstract

The utility model discloses a differential shell blank with a riser neck far away from a positioning surface, which comprises a shell (1) and a riser neck (2) fixedly connected with the shell (1), and a recess (3) is arranged on the upper surface of the riser neck (2). The recess (3) is arranged at the joint of the riser neck (2) and a boss (12) below a positioning surface (11) of the shell (1), and the upper surface of the recess (3) is lower than the positioning surface (11). After the differential shell blank with the riser neck far away from the positioning surface is cast, the riser neck is separated from a casting, so that the positioning surface can be effectively avoided when the riser neck is machined by a polishing tool, and the reject ratio of the casting is reduced.

Description

Technical Field

[0001] The utility model relates to the field of casting processing, in particular to a differential housing blank with a riser neck away from a positioning surface. Background Art

[0002] In order to ensure that the interior of the casting is filled with molten metal, prevent air holes and shrinkage holes, and improve the integrity and strength of the casting, a riser is required to fill the casting with iron. After the shell casting is completed, it needs to be separated from the riser. After gradually separating from the riser, part of the riser neck will remain.

[0003] Currently, after pouring, the riser neck of the differential housing blank is connected to the casting's locating surface. Therefore, before machining the casting, the riser neck must be removed to expose the locating surface for machining. However, during the riser neck removal process, grinding tools can easily cut into the casting's locating surface. This results in large errors in the clamping locating surface during the final machining of the casting, rendering it unusable and ultimately scrapped. Utility Model Content

[0004] The utility model aims to provide a differential case blank with a riser neck away from a positioning surface. After the differential case blank with a riser neck away from the positioning surface is cast, the riser neck is at a distance from the casting, so that the grinding tool can effectively avoid the positioning surface when machining the riser neck, thereby reducing the defective rate of the casting.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a differential case blank with a riser neck away from the positioning surface, the differential case blank with a riser neck away from the positioning surface includes a housing 11 and a riser neck 11 fixedly connected to the housing 11, the upper surface of the riser neck 11 is provided with a recess 11, the recess 11 is provided at the connection between the riser neck 11 and the boss 11 below the positioning surface 11 of the housing 11, and the upper surface of the recess 11 is lower than the positioning surface 11.

[0006] Preferably, the width of the recess 11 is set to 5-10 mm.

[0007] The utility model also provides a casting mold for producing a differential case blank with the riser neck away from the positioning surface, the casting mold comprising a plurality of casting units, the casting unit comprising a riser 11 located in the middle and a plurality of housing molds 11 surrounding the riser 11 and communicating with the riser 11, the housing molds 11 and the riser 11 being connected via a riser pipe 11;

[0008] The riser pipe 11 is provided with a space-avoiding position 11 , and the space-avoiding position 11 corresponds to the recess 11 .

[0009] Preferably, a V-shaped stress groove is provided on the riser pipe 11 , and the V-shaped stress groove is located away from the shell mold 11 .

[0010] Preferably, the plurality of shell molds 11 are evenly distributed along the circumference of the riser 11 .

[0011] According to the above technical solution, the upper surface of the riser neck of the utility model is provided with a depression so that there is a certain gap between the riser neck and the positioning surface. After the casting is completed, the casting of the differential housing blank with the riser neck away from the positioning surface needs to remove the riser neck first. Since there is a gap between the riser neck and the positioning surface, the grinding tool can have enough space to avoid the positioning surface when grinding the riser neck, thereby avoiding the grinding tool from damaging the positioning surface and affecting the positioning accuracy of subsequent machining.

[0012] Therefore, by providing a recess to separate the riser neck from the positioning surface, the positioning surface can be effectively protected and the qualified rate of castings can be improved.

[0013] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 The invention relates to a differential housing blank in which the riser neck is far away from the locating surface;

[0016] Figure 2 The invention relates to a differential housing blank;

[0017] Figure 3 A casting mold for producing a differential case blank with a riser neck away from a locating surface;

[0018] Figure 4 It is a BB cross-section;

[0019] Figure 5 It is a partial view in direction A;

[0020] Figure 6 It is a casting mold for producing differential case blanks;

[0021] Figure 7 It is a DD cross-section;

[0022] Figure 8 It is a local view in the C direction.

[0023] Description of Reference Numerals

[0024] 1 Shell 2 Riser Neck

[0025] 3 recessed 11 positioning surface

[0026] 12 bosses and 4 risers

[0027] 5 Shell mold 6 Riser pipe

[0028] 7 Avoidance position DETAILED DESCRIPTION

[0029] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0030] In the present invention, unless otherwise stated, directional words such as “away from, below, lower than, middle, circumferential” contained in a term merely represent the orientation of the term in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term.

[0031] See also Figure 1 A differential case blank with a riser neck away from a positioning surface comprises a case 1 and a riser neck 2 fixedly connected to the case 1, a recess 3 is provided on the upper surface of the riser neck 2, and the recess 3 is provided at the connection between the riser neck 2 and a boss 12 below the positioning surface 11 of the case 1, and the upper surface of the recess 3 is lower than the positioning surface 11.

[0032] like Figure 2 The figure shows a commonly used differential case blank. After casting, the riser neck 2 is connected to the locating surface 11 of the case 1. After the casting is completed, the riser neck 2 of the part needs to be removed by grinding. Because the riser neck 2 is connected to the locating surface 11 of the case 1, the grinding tool can easily touch the locating surface 11 during the grinding process, damaging the positioning accuracy of the locating surface 11. Ultimately, this can lead to inaccurate positioning of the casting during subsequent machining, resulting in a substandard casting.

[0033] By implementing the above technical solution, the upper surface of the riser neck 2 is provided with a recess 3 so that there is a certain gap between the riser neck 2 and the positioning surface 11, such as Figure 1 As shown, after the casting is completed, the riser neck 2 of the differential housing blank casting that is away from the positioning surface needs to remove the riser neck 2 first. Since there is a gap between the riser neck 2 and the positioning surface 11, the grinding tool can have enough space to avoid the positioning surface 11 when grinding the riser neck 2, thereby avoiding the grinding tool from damaging the positioning surface 11 and affecting the positioning accuracy of subsequent machining.

[0034] Therefore, by providing the recess 3 to separate the riser neck 2 from the positioning surface 11 , the positioning surface 11 can be effectively protected, thereby improving the qualified rate of castings.

[0035] In this embodiment, preferably, the width of the recess 3 is set to 5-10 mm.

[0036] The width of the recess 3 is set to 5-10 mm so that when the riser neck 2 is polished, the polishing tool still has a margin of 5-10 mm from the positioning surface 11 , which can effectively protect the positioning surface 11 .

[0037] Preferably, to better protect the positioning surface 11, a protective tool can be provided when grinding the riser neck 2. The protective tool is configured to match the recess 3, and is arranged along the outer side of the positioning surface 11 in the longitudinal direction, forming an arc shape. When the riser neck 2 needs to be ground, the tool can be inserted into the recess 3. This tool can effectively isolate the grinding tool from the positioning surface 11, thereby effectively protecting the positioning surface 11.

[0038] See also Figure 3-5 The casting mold for producing a differential case blank with a riser neck away from the positioning surface includes a plurality of casting units, each of which includes a riser 4 located in the middle and a plurality of housing molds 5 surrounding the riser 4 and communicating with the riser 4. The housing molds 5 are connected to the riser 4 via a riser pipe 6.

[0039] A space-avoiding position 7 is provided on the riser pipe 6 , and the space-avoiding position 7 corresponds to the recess 3 .

[0040] In order to improve the efficiency of casting, a mold is provided with multiple casting units. Each casting unit includes a riser 4, and multiple shell molds 5 connected to the riser 4 are provided near the riser 4. These multiple shell molds 5 can be filled with iron through the riser pipe 6.

[0041] like Figure 6-8 As shown, the riser pipe 6 of the currently commonly used casting mold is located on the boss 12 and is connected to the positioning surface 11, so the casting after pouring will be as shown in FIG. Figure 2 As shown, the riser neck 2 is connected to the positioning surface 11 , and the positioning surface 11 is easily damaged when the riser neck 2 is subsequently polished.

[0042] When casting a differential case blank using this casting mold for producing a riser neck away from the locating surface, the riser tube 6 is provided with a clearance point 7. After the casting is completed, a recess 3 is formed at the clearance point 7, thereby ensuring a gap between the locating surface 11 and the riser neck 2. This ensures that when grinding the riser neck 2, a certain amount of space can be maintained between the grinding tool and the locating surface 11, preventing damage to the locating surface 11 during the grinding process.

[0043] In this embodiment, preferably, a V-shaped stress groove is provided on the riser pipe 6 , and the V-shaped stress groove is located away from the shell mold 5 .

[0044] After the casting is completed, in order to facilitate the separation of the casting from the shell mold 5, a V-shaped stress groove 6 is provided on the riser pipe 6. When the casting needs to be separated, the position of the V-shaped stress groove 6 will be broken. Since the V-shaped stress groove is located away from the shell mold 5, the broken riser neck 2 will remain on the casting body 1, and the broken end face will not affect the surface of the shell 1, thereby ensuring the integrity of the casting shell 1.

[0045] In this embodiment, preferably, the plurality of shell molds 5 are evenly distributed along the circumference of the riser 4 .

[0046] The uniform distribution of the multiple shell molds 5 along the circumference of the riser 4 can make the pouring process smoother, so that the shell molds 5 can achieve pouring synchronously.

[0047] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0048] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0049] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A differential case blank with a riser neck away from a positioning surface, characterized in that: A differential case blank with a riser neck away from a positioning surface comprises a case (1) and a riser neck (2) fixedly connected to the case (1); a recess (3) is provided on the upper surface of the riser neck (2); the recess (3) is provided at the connection between the riser neck (2) and a boss (12) below the positioning surface (11) of the case (1); and a surface of the recess (3) is lower than the positioning surface (11).

2. The differential case blank with the riser neck away from the positioning surface according to claim 1, characterized in that: The width of the recess (3) is set to 5-10 mm.

3. A casting mold for producing a differential case blank with a riser neck away from a positioning surface as claimed in any one of claims 1 to 2, characterized in that: The casting mold comprises a plurality of casting units, each of which comprises a riser (4) located in the middle and a plurality of shell molds (5) surrounding the riser (4) and communicating with the riser (4), wherein the shell molds (5) are connected to the riser (4) via a riser pipe (6); A space-avoiding position (7) is provided on the riser pipe (6), and the space-avoiding position (7) corresponds to the recess (3).

4. The casting mold according to claim 3, characterized in that The riser pipe (6) is provided with a V-shaped stress groove, and the V-shaped stress groove is located at a position away from the shell mold (5).

5. The casting mold according to claim 3, characterized in that The plurality of shell molds (5) are evenly distributed along the circumference of the riser (4).

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