Differential shell casting with grinding-free riser neck and die for producing differential shell casting

Abstract

The utility model discloses a differential shell casting with a polishing-free riser neck, the differential shell casting with the polishing-free riser neck comprises a casting body (1) and the riser neck (2) connected to the casting body (1), the radius of the casting body (1) at the connecting position is reduced, and the width of the riser neck (2) is not greater than the maximum value of the radius reduction amount; the maximum value of the radius reduction amount is smaller than the designed machining allowance of the casting body (1). The differential shell casting produced by the differential shell casting with the grinding-free riser neck can avoid the risk of cutter breakage in the machining process, so that the riser neck does not need to be ground.

Description

Technical Field

[0001] The utility model relates to the field of casting, in particular to a differential housing casting with a riser neck that does not require grinding and a mold for producing the same. Background Art

[0002] The differential is a key component in a car's drivetrain, used to distribute drive to the wheels, allowing them to rotate at different speeds when turning.

[0003] The differential housing is usually obtained by casting. During the casting process of the differential housing, a riser is required to fill the differential housing casting with iron 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. After the casting of the housing is completed, the riser needs to be separated from the riser.

[0004] At present, in order to prevent the defect of insufficient meat when the casting is separated from the riser, a V-shaped stress groove that follows the shape of the casting by 2-3 mm is usually designed to make it easier for the casting to be separated from the riser. Moreover, through the protection of the riser neck that follows the shape of the casting by 2-3 mm, the shell casting will not produce insufficient meat defects when it is separated. However, a 2-3 mm bulge will remain on the outer circle of the final blank. Since the shell casting needs to be machined on the outer circle later, the machining tool is prone to breakage at the position where the riser neck remains. Therefore, before machining, it is necessary to manually or machine-use a grinding wheel to remove the riser neck, which is very time-consuming and affects the production efficiency of the shell casting. Utility Model Content

[0005] The purpose of the utility model is to provide a differential housing casting with a riser neck that does not require grinding and a mold for producing the same. The differential housing casting produced by the differential housing casting with a riser neck that does not require grinding can avoid the risk of tool breakage during the machining process, so there is no need to grind the riser neck.

[0006] To achieve the above-mentioned object, the present invention provides a differential case casting with a riser neck that does not require grinding. The differential case casting with a riser neck that does not require grinding comprises a casting body and a riser neck connected to the casting body. The radius of the casting body is reduced at the connection position, and the width of the riser neck is not greater than the maximum value of the radius reduction.

[0007] The maximum value of the radius reduction amount is less than the design machining allowance of the casting body.

[0008] Preferably, the connection between the riser neck and the casting body is configured as a plane.

[0009] Preferably, the maximum value of the radius reduction is set to 1.5-2 mm.

[0010] Preferably, the width of the riser neck is set to 1-1.5 mm.

[0011] Preferably, the machining allowance of the riser neck at the location where the radius of the casting body is reduced the most is 0-0.5 mm.

[0012] The utility model also provides a mold for producing the differential case casting without grinding the riser neck, the mold comprising a plurality of casting units, the casting unit comprising a riser located in the middle and a plurality of housing molds surrounding the riser and communicating with the riser, the housing molds and the riser being connected via a riser pipe;

[0013] A V-shaped stress groove is provided on the riser pipe at a position corresponding to the riser neck, and the distance between the narrowest part of the V-shaped stress groove and the casting body is equal to the width of the riser neck.

[0014] Preferably, the plurality of shell molds are evenly distributed along the circumference of the riser.

[0015] According to the above technical solution, the radius of the position where the casting body and the riser neck of the differential housing casting of the utility model are connected is reduced, which is equivalent to transferring part of the size of the casting body at this position to the riser neck, thereby avoiding the situation where the differential housing casting of the riser neck does not require grinding has a large axial thickness deviation after casting is completed, thereby avoiding the problem of the tool moving to the riser and encountering a deep processing thickness, which is easy to break the tool.

[0016] Preferably, in order to more effectively avoid the problem of excessive thickness at the connection between the riser neck and the casting body of the differential case casting without grinding of the riser neck, the maximum value of the radius reduction of the casting body 1 at the connection is set to be less than the machining allowance of the casting body, that is, after the casting is completed, the casting body still has a machining allowance in the axial direction for machining.

[0017] At the same time, the width of the riser neck 2 is set to a value not greater than the maximum value of the reduction of the casting body. Then, the thickness of the riser neck will be used entirely as a machining allowance. Since the width of the riser neck is not greater than the value of the reduction of the casting body, it can be ensured that the thickness of the connection between the casting body and the riser neck will not be greater than the originally designed machining allowance, thereby ensuring that the machining tool will not encounter a thicker machining thickness after reaching this position, thereby reliably avoiding the occurrence of tool breakage.

[0018] 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

[0019] 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:

[0020] Figure 1 It is a differential case casting with a riser neck that does not require grinding;

[0021] Figure 2 A part of a mold for producing a differential housing casting without grinding the riser neck;

[0022] Figure 3 A mold for producing differential housing castings without grinding the riser neck;

[0023] Figure 4 It is a differential case casting whose riser neck needs to be ground.

[0024] Description of Reference Numerals

[0025] 1 Casting body 2 Riser neck

[0026] 3 riser 4 shell mold

[0027] 5 Riser pipe 6V stress groove DETAILED DESCRIPTION

[0028] 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.

[0029] In the present invention, unless otherwise stated, directional words such as "middle" and "circumferential" contained in a term merely represent the orientation of the term in normal use, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term.

[0030] See also Figure 1 A differential case casting with a riser neck that does not require grinding is disclosed. The differential case casting with a riser neck that does not require grinding includes a casting body 1 and a riser neck 2 connected to the casting body 1. The radius of the casting body 1 is reduced at the connection position, and the width of the riser neck 2 is not greater than the maximum value of the radius reduction.

[0031] Since the differential case casting is designed with a machining allowance to allow machining of the case surface after casting, the design allowance is approximately 2 mm. Currently, according to conventional designs, a riser pipe is connected to the mold of the casting body 1 to fill the casting with iron during the casting process. After the casting is separated, a portion of the riser neck 2 will remain on the surface of the casting body 1. Figure 4When machining the surface of the casting body 1, the tool can process other parts of the casting body 1 normally according to the normal feed rate. However, once the tool moves to the position of the riser neck 2, the tool is likely to break due to the sudden increase in the machining thickness at this position.

[0032] By implementing the above technical solution, the radius of the connection position between the casting body 1 and the riser neck 2 of the differential case casting without riser neck grinding is reduced, which is equivalent to transferring a part of the size of the casting body at this position to the riser neck 2, thereby avoiding the situation where the differential case casting without riser neck grinding has a large axial thickness deviation after casting is completed, thereby avoiding the problem of the tool moving to the riser neck 2 and encountering a deep processing thickness, which is easy to break the tool.

[0033] Preferably, in order to more effectively avoid the problem of excessive thickness at the connection between the riser neck 2 and the casting body 1 of the differential case casting without riser neck grinding, the maximum value of the radius reduction of the casting body 1 at the connection is set to be less than the machining allowance of the casting body 1, that is, after the casting is completed, the casting body 1 still has a machining allowance in the axial direction for machining.

[0034] At the same time, the width of the riser neck 2 is set to a value not greater than the maximum value of the reduction of the casting body 1, so the thickness of the riser neck 2 will be used entirely as a machining allowance. Since the width of the riser neck 2 is not greater than the value of the reduction of the casting body, it can be ensured that the thickness of the connection between the casting body 1 and the riser neck 2 will not be greater than the originally designed machining allowance, thereby ensuring that the machining tool will not encounter a thicker machining thickness after reaching this position, thereby reliably avoiding the occurrence of tool breakage.

[0035] In this embodiment, preferably, the connection between the riser neck 2 and the casting body 1 is set to be a plane.

[0036] like Figure 4 As shown, the edge of the original casting body 1 is set to be an arc shape, and the riser neck 2 is connected to the arc surface of the casting body 1 along the normal direction of the arc surface. The connection between the riser neck 2 and the casting body 1 is a section of arc surface. The machining thickness is uniform at the arc surface position of the entire connection. Therefore, after the tool runs to this arc surface position, it needs to continue to process very thick workpieces, and the tool breakage phenomenon is very likely to occur.

[0037] like Figure 1As shown, when the connection between the riser neck 2 and the casting body 1 is set as a flat surface, the axial thickness of the casting body 1 varies along the connection point of the plane. The machining thickness gradually decreases as the tool moves from the left and right sides of the plane toward the normal position of the connecting arc. Therefore, in actual production, when the tool reaches the connection point of the plane, it will encounter a thick machining thickness. However, as the machining continues, the machining thickness becomes thinner. Therefore, as long as the tool can pass the thickest point, the tool will not break.

[0038] In this embodiment, preferably, the maximum value of the radius reduction amount is set to 1.5-2 mm.

[0039] Currently, the machining allowance of the casting body 1 is set to about 2 mm. After the connection position between the casting body 1 and the riser neck 2 is shifted inward by 1.5-2 mm from the farthest end of the radius of the casting body 1, the machining allowance of the casting body 1 at the normal position of the connection surface is the smallest, but a machining allowance of 0.5 mm can still be retained. Moving from the normal position to both sides, the machining allowance will gradually increase. Combined with the width of the riser neck 2, the machining requirements of the connection position can be met.

[0040] This translation method is used to solve the problem of reducing the radius of the casting body 1, which can meet the processing requirements of the product and also reduces the difficulty of manufacturing.

[0041] In this embodiment, preferably, the width of the riser neck 2 is set to 1-1.5 mm.

[0042] When the connection position between the casting body 1 and the riser neck 2 is shifted inward by 1.5-2 mm, and the width of the riser neck 2 is increased by 1-1.5 mm, the 2 mm machining allowance originally designed for the casting body 1 can be basically met.

[0043] Since these data refer to the machining allowance at the normal position of the connection surface, the machining allowance will gradually increase in the process of moving from the normal position to both sides. Therefore, the width of the riser neck 2 cannot exceed the inward translation distance of the connection position between the casting body 1 and the riser neck 2. Preferably, the width of the riser neck 2 is set to 1-1.5mm, which can ensure the machining allowance at the normal position of the connection surface while avoiding excessive machining thickness on both sides of the connection position.

[0044] In this embodiment, preferably, the machining allowance of the riser neck 2 at the location where the radius reduction of the casting body 1 is the largest is 0.5-1 mm.

[0045] The position where the radius of the casting body 1 is reduced the most is the normal position of the connection surface. When the connection surface is a plane, the machining allowance at this position is the smallest.

[0046] The machining allowance of the non-connected position of the casting body 1 is about 2 mm, but the machining allowance at the point where the radius of the casting body 1 is reduced the most should be set smaller than that of the non-connected position, so that the machining allowance of other positions of the riser neck 2 will not be too thick and can still meet the 2 mm requirement. This can effectively avoid the situation of tool breakage during the machining of the riser neck 2.

[0047] See also Figure 2-3 The mold for producing a differential case casting without grinding the riser neck is characterized in that the mold includes multiple casting units, each of which includes a riser 3 located in the middle and multiple housing molds 4 surrounding the riser 3 and communicating with the riser 3, wherein the housing molds 4 are connected to the riser 3 via a riser pipe 5;

[0048] A V-shaped stress groove 6 is provided on the riser pipe 5 at a position corresponding to the riser neck 2 . The distance between the narrowest part of the V-shaped stress groove 6 and the casting body 1 is equal to the width of the riser neck 2 .

[0049] To improve casting efficiency, a mold is equipped with multiple casting units. Each casting unit includes a riser 3, and multiple shell molds 4 connected to the riser 3 are arranged near the riser 3. These multiple shell molds 4 can all be filled with iron through the riser pipe 5.

[0050] After casting is completed, in order to facilitate the separation of the casting from the shell mold 4, a V-shaped stress groove 6 is provided on the riser pipe 5. When the casting needs to be separated, the position of the V-shaped stress groove 6 will be broken, so the riser neck 2 will remain on the casting body 1.

[0051] Therefore, the distance between the narrowest part of the V-shaped stress groove 6 and the casting body 1 needs to be reliably controlled so that after the casting is separated, the width of the riser neck 2 can meet the design requirements, thereby making it possible for the riser neck 2 part of the differential case casting that does not require grinding to be directly machined without grinding.

[0052] In this embodiment, preferably, the plurality of shell molds 4 are evenly distributed along the circumference of the riser 3 .

[0053] The uniform distribution of the multiple shell molds 4 along the circumference of the riser 3 can make the pouring process smoother, so that the shell molds 4 can achieve pouring synchronously.

[0054] 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.

[0055] 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.

[0056] 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 housing casting with a riser neck that does not require grinding, characterized in that: The differential case casting with a riser-free grinding comprises a casting body (1) and a riser neck (2) connected to the casting body (1); the radius of the casting body (1) is reduced at the connection position, and the width of the riser neck (2) is not greater than the maximum value of the radius reduction; The maximum value of the radius reduction amount is less than the design machining allowance of the casting body (1).

2. The differential case casting without grinding of the riser neck according to claim 1, characterized in that: The connection between the riser neck (2) and the casting body (1) is arranged to be a plane.

3. The differential case casting without grinding of the riser neck according to claim 2, characterized in that: The maximum value of the radius reduction amount is set to 1.5-2 mm.

4. The differential case casting without grinding of the riser neck according to claim 3, characterized in that: The width of the riser neck (2) is set to 1-1.5 mm.

5. The differential case casting without grinding of the riser neck according to claim 2, characterized in that: The machining allowance of the riser neck (2) at the location where the radius reduction of the casting body (1) is the largest is 0-0.5 mm.

6. A mold for producing a differential case casting without grinding the riser neck according to any one of claims 1 to 2, characterized in that: The mold comprises a plurality of casting units, each of which comprises a riser (3) located in the middle and a plurality of shell molds (4) surrounding the riser (3) and communicating with the riser (3), wherein the shell molds (4) are connected to the riser (3) via a riser pipe (5); A V-shaped stress groove (6) is provided on the riser pipe (5) at a position corresponding to the riser neck (2), and the distance between the narrowest point of the V-shaped stress groove (6) and the casting body (1) is equal to the width of the riser neck (2).

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

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