A vertical parting casting mold for a suspension swing arm

Abstract

The present invention relates to the field of casting technology, and in particular to a vertical split casting mold for a suspension swing arm, comprising a first mold and a second mold, wherein the first mold comprises a first mold plate, a first pouring cup, a runner system and at least one group of first casting molds are arranged above the first mold plate, and the two first casting molds in each group are symmetrically arranged along the inclined surface direction, the runner system is located between the two first casting molds in each group, a plurality of endogates are arranged on the inner side of the first casting mold, and the plurality of endogates are located on the same side of the first casting mold, and a riser is arranged on the outer side of the first arm; the second mold comprises a second mold plate, a second casting mold and a second pouring cup. In the case of limited mold size, the present invention arranges multiple casting cavities symmetrically along the inclined surface direction, and through reasonable optimization design of the pouring system and the parting surface, the casting quality of the product in the two metal liquid filling sequences can be simultaneously guaranteed during vertical split casting.

Description

Technical Field

[0001] The invention relates to the technical field of casting, in particular to a vertical split casting mould for a suspension swing arm. Background Art

[0002] The main function of the automobile suspension system is to buffer and absorb the vibration from the wheels, and transmit driving force and braking force. The automobile suspension system includes many components, among which the swing arm is its core component. The automobile suspension swing arm not only plays the role of guiding, supporting and shock absorbing, but also relates to the driving stability. When driving on uneven roads, it is necessary to generate action and reaction forces to control the driving direction and ensure the smooth driving of the vehicle.

[0003] The suspension arm is formed by casting, wherein sand casting includes horizontal parting vertical casting and vertical parting vertical casting. The inner gates of horizontal parting casting and vertical parting casting are usually located on the parting surface. The difference is that the parting surface of horizontal parting casting is horizontal, and the upper and lower sand molds are combined to form a casting cavity. After the molten metal is injected from the inner gate, it is gradually filled from the cavity of the lower sand mold to the cavity of the upper sand mold; the parting surface of vertical parting casting is vertical, and the left and right sand molds are combined to form a casting mold. The molten metal filling process is gradually filled from the lower part of the casting cavity to the upper part.

[0004] In the existing vertical parting casting process, the casting of the suspension swing arm has the following problems:

[0005] 1. In the existing one-mold multi-piece casting technology, the vertically parted cavities are usually arranged in sequence along the horizontal or vertical plane, or symmetrically arranged along the horizontal or vertical direction, to ensure that the filling order of the castings in each cavity is consistent, thereby ensuring the quality of the product; however, the suspension arm is a Y-shaped structure, that is, it is provided with three connecting arms, and due to the structure of the suspension arm and the limitation of the casting sand mold size by the casting production line, one sand mold can only be arranged with one cavity according to the existing pouring and filling method, resulting in low production efficiency;

[0006] 2. Compared with horizontal parting casting, in vertical parting casting, ensuring the stability of the flow of molten metal in the cavity is the key to affecting the quality of castings. That is, during the pouring process, the speed, smoothness and stability of the flow of molten metal in the cavity are the key to determining whether the casting will have casting defects such as clamping, surface pinholes, shrinkage, cold shut, etc. However, since the suspension arm is provided with a groove in the middle, and the side wall of the connecting arm is provided with multiple weight-reducing grooves and reinforcing rib structures, the casting structure is complex and the wall thickness is uneven, which affects the speed and stability of the flow of molten metal, increases the difficulty of casting and filling the casting, and adopts top-injection, bottom-injection pouring or pouring from multiple sides at the same time. There are defects such as shrinkage, cold shut, clamping or surface pinholes in the casting, which makes the casting yield only 30%-40%, which greatly affects the production efficiency of the casting. Summary of the invention

[0007] The purpose of the present invention is to address the deficiencies of the prior art and to provide a vertically split casting mold for a suspension swing arm. When the mold size is limited, multiple casting cavities are symmetrically arranged along the inclined surface direction, and the pouring system and parting surface are reasonably optimized and designed, so that during vertical split casting, the product casting quality of two metal liquid filling sequences can be simultaneously guaranteed.

[0008] The technical solution adopted by the present invention to solve the technical problem is: a vertical split casting mold for a suspension swing arm, comprising a first mold and a second mold,

[0009] The first mold comprises a first mold plate, a first pouring cup, a runner system and at least one group of first casting molds are arranged above the first mold plate, two first casting molds in each group are symmetrically arranged along the inclined plane direction, the third arm of the first casting mold is located outside the first arm and the second arm, the first arm of the first casting mold located above the runner system is horizontal, and the first arm of the first casting mold located below the runner system is vertical, the first pouring cup is located above the first casting mold, the runner system is located between the two first casting molds in each group, the runner system comprises a main runner and a plurality of branch runners, the main runner is connected to the first pouring cup, a plurality of ingates are arranged on the inner side of the first casting mold, i.e., a side close to the runner system, the plurality of ingates are located on the same side of the first casting mold, the branch runner is connected to the ingates, and a riser is arranged on the outer side of the first arm;

[0010] The second mold includes a second mold plate, a second casting mold and a second pouring cup are arranged above the second mold plate, the second pouring cup is arranged corresponding to the first pouring cup, and the second casting mold is arranged corresponding to the first casting mold.

[0011] Furthermore, the branch runner includes a first branch runner and a second branch runner, the first branch runner is perpendicular to the inner arm of the first casting mold, the second branch runner is set at an angle to the inner wall of the first casting mold, and the second branch runner is located at the lower part below the main runner.

[0012] Furthermore, on the inner side of the same first casting mold, from bottom to top, the cross-sectional area of ​​the branch runner increases first and then decreases.

[0013] Further, a cross-sectional area of ​​a liquid outlet section of the sub-runner connected to the first arm of the first casting mold is smaller than a cross-sectional area of ​​a liquid outlet section of the sub-runner connected to the second connecting arm of the first casting mold.

[0014] Furthermore, the cross-sectional area of ​​the liquid outlet section of the branch runner connected to the first arm of the first casting mold is 1 / 2 to 1 / 3 of the cross-sectional area of ​​the liquid inlet section of the branch runner or the main runner.

[0015] Furthermore, the first mold plate is provided for forming a first boss and a second boss of a parting surface, the first boss and the second boss are located on the side of the first arm, and the split runner is located between the first boss and the second boss.

[0016] Furthermore, along the direction from the free end to the fixed end of the first arm, the height of the upper surface of the first boss first gradually increases and then gradually decreases.

[0017] Furthermore, the second mold is provided with a third boss for forming a parting surface, the third boss is located on the inner side of the second arm of the second casting mold, and the first mold plate is provided with a third groove matching with the third boss.

[0018] Furthermore, the first mold plate and the second mold plate are provided with a first sand core metal mold for forming a sand core cavity and a second sand core metal mold for forming a casting weight reduction groove, and the first sand core metal mold and the second sand core metal mold located on the first mold plate are provided with positioning core heads.

[0019] Furthermore, the first mold plate is provided with an exhaust hole, and the exhaust hole is located above the first casting mold.

[0020] The beneficial effects of the present invention are:

[0021] 1. In the casting mold of the vertical split casting of the present invention, the casting mold used to form the casting cavity is symmetrically arranged along the inclined direction perpendicular to the mold plate, rather than being arranged horizontally or vertically or symmetrically arranged. The symmetrical arrangement can form two casting cavities within a limited sand mold size, thereby improving production efficiency. At the same time, since the suspension swing arm is an asymmetric structure, the arrangement of the casting cavity makes the metal liquid filling sequence of each connecting arm of the two suspension swing arms different. The present invention arranges at least three inner gates on the same side of the casting mold so that the metal liquid is filled from multiple locations on the same side of the casting cavity at the same time, and optimizes the size of the branch runners connecting each inner gate to control the liquid inlet speed of multiple locations on the same side, reduce the temperature difference of the metal liquid at each inner gate, and make the flow speed and flow stability of the metal liquid in the cavity of the two filling sequences, thereby ensuring the quality of the casting and avoiding the problems of cold shut and shrinkage of the casting.

[0022] 2. The casting mold of the present invention can have two cavities in one mold when the mold size is limited, so that two castings can be formed at one time during casting. In addition, the present invention optimizes the pouring system and ensures the quality of the castings obtained by the filling sequence of the two metal liquids of the suspension swing arm. The output rate of the castings is more than 90%. The present invention not only improves the production efficiency, but also increases the output rate of the present invention by 2-3 times compared with the output rate of the prior art.

[0023] 3. The setting of the parting surface can provide better pouring for the casting and ensure the smooth flow of molten metal. The present invention forms a parting surface on the inner side of the casting by setting a boss structure on the inner side of the casting cavity, and cooperates with the setting of the pouring system to ensure the stability of the flow of molten metal in the casting cavity during pouring, thereby ensuring different filling sequences of the same casting cavity and the quality of the products obtained by pouring and casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the first mold structure of the present invention.

[0025] Figure 2 It is a structural schematic diagram of the second mold of the present invention.

[0026] Figure 3 yes Figure 1 Cross-sectional view along the AA direction.

[0027] Figure 4 It is a structural schematic diagram of the runner system of the present invention.

[0028] Figure 5 It is a structural schematic diagram of the branch runner connected to the first arm of the present invention.

[0029] Figure 6 It is a schematic structural diagram of the sand mold prepared by the present invention after mold closing.

[0030] Description of reference numerals:

[0031] 1——first mold, 11——first mold plate, 12——first pouring cup, 13——runner system, 131——main runner, 132——sub-runner, 1321——first sub-runner, 1322——second sub-runner, 14——first casting mold, 141——int gate, 15——riser, 16——first boss, 17——second boss, 18——exhaust hole, 2——second mold, 21——second mold plate, 22——second casting mold, 23——second pouring cup, 24——third boss, 3——suspension swing arm, 31——first arm, 32——second arm, 33——third arm, 4——first sand core metal mold, 5——second sand core metal mold. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the implementation scope of the present invention is not limited thereto.

[0033] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a vertical split casting mold for a suspension swing arm 3 of this embodiment includes a first mold 1 and a second mold 2. The first mold 1 is used to make a left sand mold for vertical split sand mold casting, and the second mold 2 is used to make a right sand mold for vertical split sand mold casting. After the left sand mold and the right sand mold are combined, as shown in FIG. Figure 6 The interior shown forms a casting cavity similar in shape to the cantilever swing arm;

[0036] like Figure 1As shown, the first mold 1 includes a first mold plate 11, and a first pouring cup 12, a runner system 13 and at least one group of first casting molds 14 are arranged above the first mold plate 11. The two first casting molds 14 in each group are symmetrically arranged along the inclined plane direction, that is, the structures of the two first casting molds 14 are symmetrically arranged along the inclined plane direction, and the third arm 33 of the first casting mold 14 is located outside the first arm 31 and the second arm 32, the first arm 31 of the first casting mold 14 located above the runner system 13 is horizontal, and the first arm 33 of the first casting mold 14 located below the runner system 13 is horizontal. 1 vertically, the first gate is located above the first casting mold 14, the runner system 13 is located between each group of two first casting molds 14, the runner system 13 includes a main runner 131 and a plurality of branch runners 132, the main runner 131 is connected to the first gate, the inner side of the first casting mold 14, i.e., a side close to the runner system 13, is provided with a plurality of ingates 141, the plurality of ingates 141 are located on the same side of the first casting mold 14, the branch runner 132 is connected to the ingates 141, and the outer side of the first arm 31 is provided with a riser 15;

[0037] like Figure 2 As shown, the second mold 2 includes a second mold plate 21, and a second casting mold 22 and a second pouring cup 23 are arranged above the second mold plate 21. The second pouring cup 23 is arranged corresponding to the first pouring cup 12, and the second casting mold 22 is arranged corresponding to the first casting mold 14.

[0038] The vertical split casting process of the present invention is as follows: a sand mold with a mold cavity is made by using a first mold 1 and a second mold 2, and the two sand molds are combined to form a casting mold cavity of the suspension swing arm 3, and then molten metal is poured into the runner system 13 through a pouring cup, and the molten metal passes through the runner system 13 and enters the casting mold cavity, and a casting is obtained after cooling. Figure 1 As shown, in the case where the mold size is limited, the present invention sets two casting molds symmetrical along the inclined surface direction on the mold plate. Since the suspension swing arm 3 is a Y-shaped and asymmetrical casting, this setting makes the metal liquid pouring and filling sequence of each arm of the suspension swing arm 3 different. The present invention sets at least three inner gates 141 on the inner side (same side) of the casting mold, sets the pouring system between the two casting molds, and optimizes the size of each branch runner 132, thereby reducing the temperature difference of the metal liquid entering the casting cavity through each branch runner 132, ensuring the fluidity of the metal liquid in the casting cavity, which is beneficial to ensuring the casting quality of the casting and avoiding casting defects such as shrinkage and cold shut in the casting.

[0039] like Figure 1 and Figure 4As shown, the branch runner 132 includes a first branch runner 1321 and a second branch runner 1322, the first branch runner 1321 is perpendicular to the inner arm of the first casting mold 14, the second branch runner 1322 is set at an angle of 30-60° to the inner wall of the first casting mold 14, the main runner 131 is an arc structure, and the second branch runner 1322 is located at the lower part below the main runner 131. Since the suspension swing arm 3 of the present invention is an asymmetric structure, and the casting mold cavity is symmetrically arranged along the inclined plane, during vertical split casting, the metal liquid filling order of the cavities on both sides of the runner system 13 is different, such as Figure 1 As shown, the casting cavity located above the pouring system is first filled with the second arm 32, and then filled with the third arm 33 and the first arm 31, while the casting cavity located below the pouring system is first filled with the second arm 32 and the third arm 33, and then filled with the first arm 31. The present invention also makes the second branch runner 1322 and the first branch runner 1321 have different angles with the casting cavity, so that the flow rate and flow direction of the molten metal in the casting cavity on both sides of the runner system 13 are different, thereby ensuring the flow rate and smoothness of the molten metal in the casting cavity on both sides of the runner system 13, avoiding problems such as cold shut and shrinkage of the casting, and ensuring the casting quality of the Y-type castings with two molten metal filling sequences.

[0040] On the inner side of the same casting mold, from bottom to top, the cross-sectional area of ​​the branch runner 132 increases first and then decreases. The flow rate of the molten metal of each ingates 141 is adjusted by optimizing the size of several branch runners 132 on the same side to reduce the temperature difference of the molten metal transported by each ingates 141, thereby avoiding the cold shut problem of the casting caused by the confluence of multiple streams of molten metal in the casting cavity. Preferably, on the inner side of the same casting mold, the cross-sectional area of ​​the top branch runner 132 is less than the cross-sectional area of ​​the bottom branch runner 132 and less than the cross-sectional area of ​​the middle branch runner 132. The present invention controls the flow rate of the molten metal of each ingate by reasonably setting the position of the ingates and the size of each branch runner, thereby ensuring the balance of the temperature transported by each ingates, thereby ensuring the flow rate, flow and stability of the molten metal flow, avoiding casting defects, especially avoiding shrinkage and cold shut phenomena of the suspension swing arm.

[0041] The inner side of the first casting mold 14 is provided with three inner gates 141, that is, three branch runners 132 are provided on the same side of a casting cavity, one branch runner 132 is connected to the first arm 31 of the first casting mold 14, and two branch runners 132 are connected to the second arm 32 of the first casting mold 14. The cross-sectional area of ​​the liquid outlet section of the branch runner 132 connected to the first arm 31 of the first casting mold 14 is smaller than the cross-sectional area of ​​the liquid outlet section of the branch runner 132 connected to the second connecting arm of the first casting mold 14; the cross-sectional area of ​​the liquid outlet section of the branch runner connected to the first casting mold is smaller than the cross-sectional area of ​​the liquid inlet section. For example, when the width of the branch runner remains unchanged, Figure 5As shown, the thickness of the outlet section of the branch runner 132 connected to the first arm 31 of the first casting mold 14 is 1 / 2 to 1 / 3 of the thickness of the inlet section of the branch runner 132 or the main runner 131. Since the first arm 31 of the casting cavity on both sides of the runner system 13 is the last to be filled, the present invention increases the flow rate of the molten metal in the cavity of the first arm 31 by reducing the cross-sectional area of ​​the outlet section of the branch runner 132 of the first arm 31, so that the temperature of the molten metal entering the branch runner 132 connected to the first arm 31 decreases less when flowing downward, thereby reducing the temperature difference of the molten metal of multiple inner gates 141, and avoiding the cold shut defect of the casting caused by the large temperature difference of the molten metal. In addition, since the riser 15 is located on the outside of the first arm 31 of the first casting mold 14, during the filling process of the present invention, the molten metal first fills the casting cavity and then fills the riser 15. Therefore, by reducing the cross-sectional area of ​​the liquid outlet section of the branch runner 132 of the first arm 31 and increasing the speed at which the molten metal of the branch runner 132 enters the casting cavity, the temperature of the molten metal of the branch runner 132 can be guaranteed, thereby ensuring the temperature of the molten metal in the riser 15 and reducing the temperature difference of the molten metal, which is beneficial to the shrinkage compensation of the casting by the riser 15.

[0042] like Figure 3 As shown, the first mold plate 11 is provided with a first boss 16 and a second boss 17 for forming a parting surface, the first boss 16 is located around the end of the first arm 31 of the first casting mold 14, the first boss 16 surrounds the end of the first arm 31 of the first casting mold 14, the second boss 17 is located inside the first arm 31 of the first casting mold 14, and the branch runner 132 connected to the first arm 31 is located between the first boss 16 and the second boss 17. Along the direction from the free end to the fixed end of the first arm 31 of the first casting mold 14, the height of the upper surface of the first boss 16 gradually increases first and then gradually decreases, and the upper surface of the first boss 16 is not higher than the height of the free end of the first casting mold 14, and the second mold plate 21 is provided with a first groove and a second groove matched with the first boss 16 and the second boss 17. The parting surface of the first arm 31 is formed by the first boss 16 and the second boss 17, so that the molten metal in the cavity of the first arm 31 can be better poured and flow smoothly, and the flow rate and flow direction of the molten metal in the cavity of the first arm 31 are guaranteed, which is beneficial to ensuring the quality of the casting.

[0043] The second mold 2 is provided with a third boss 24 for forming a parting surface, and the third boss 24 is located on the inner side of the second arm 32 of the second casting mold 22, and the first mold plate 11 is provided with a third groove matched with the third boss 24. The parting surface on the side of the second arm 32 is formed by the third boss 24, so that the pouring and smooth flow of the molten metal in the cavity of the second arm 32 are ensured, and the fluidity of the molten metal in the casting cavity is ensured, which is conducive to ensuring the quality of the casting and avoiding casting defects such as shrinkage and cold shut.

[0044] The first mold plate 11 and the second mold plate 21 are provided with a first sand core metal mold 4 for forming a sand core cavity and a second sand core metal mold 5 for forming a weight-reducing groove for a casting, and the first sand core metal mold 4 and the second sand core metal mold 5 located on the first mold plate 11 are provided with positioning core heads. The sand core metal mold can form a sand core cavity for placing and fixing a sand core.

[0045] The first mold plate 11 is provided with an exhaust hole 18, and the exhaust hole 18 is located above the first casting mold 14 to facilitate the exhaust of gas in the mold cavity.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A vertical parting casting mold for a suspension swing arm, characterized in that: It comprises a first mold (1) and a second mold (2); The first mold (1) comprises a first mold plate (11), a first pouring cup (12), a runner system (13) and at least one group of first casting molds (14) are arranged above the first mold plate (11), the two first casting molds (14) in each group are symmetrically arranged along the inclined surface direction, the first pouring cup (12) is located above the first casting mold (14), the runner system (13) is located between the two first casting molds (14) in each group, the runner system (13) comprises a main runner (131) and a plurality of branch runners (132), the main runner (131) is connected to the first pouring cup (12), a plurality of inner gates (141) are arranged on the inner side of the first casting mold (14), the branch runners (132) are connected to the inner gates (141), and a riser (15) is arranged on the outer side of the first arm (31) of the first casting mold (14); The third arm (33) of the first casting mold (14) is located outside the first arm (31) and the second arm (32), the first arm (31) of the first casting mold (14) located above the runner system (13) is horizontal, and the first arm (31) of the first casting mold (14) located below the runner system (13) is vertical; The second mold (2) comprises a second mold plate (21), a second casting mold (22) and a second pouring cup (23) are arranged above the second mold plate (21), the second pouring cup (23) is arranged corresponding to the first pouring cup (12), and the second casting mold (22) is arranged corresponding to the first casting mold (14); The branch runners (132) include a first branch runner (1321) and a second branch runner (1322); the branch runners (132) above the runner system (13) are all first branch runners (1321); the lowest of the branch runners (132) below the runner system (13) is the second branch runner (1322); the others are all first branch runners (1321); the first branch runner (1321) is vertically connected to the inner arm of the first casting mold (14); The second branch runner (1322) is straight, and forms an angle of 30-60° with the inner wall of the first casting mold (14); on the inner side of the same first casting mold (14), from bottom to top, the cross-sectional area of ​​the branch runner (132) first increases and then decreases; the cross-sectional area of ​​the liquid outlet section of the branch runner (132) connected to the first arm (31) is 1 / 2 to 1 / 3 of the cross-sectional area of ​​the liquid inlet section of the branch runner (132) or the main runner (131).

2. A vertical split casting mold for a suspension swing arm according to claim 1, characterized in that: The first mold plate (11) is provided with a first boss (16) and a second boss (17) for forming a parting surface, the first boss (16) and the second boss (17) are located on the side of the first arm (31), and the split runner (132) is located between the first boss (16) and the second boss (17).

3. A vertical split casting mold for a suspension swing arm according to claim 2, characterized in that: Along the direction from the free end to the fixed end of the first arm (31), the height of the upper surface of the first boss (16) first gradually increases and then gradually decreases.

4. The vertical split casting mold for a suspension swing arm according to claim 1, characterized in that: The second mould (2) is provided with a third boss (24) for forming a parting surface, and the third boss (24) is located on the inner side of the second arm (32) of the suspension swing arm (3).

5. The vertical split casting mold for a suspension swing arm according to claim 1, characterized in that: The first mold plate (11) and the second mold plate (21) are provided with a first sand core metal mold (4) for forming a sand core cavity and a second sand core metal mold (5) for forming a casting weight reduction groove, and the first sand core metal mold (4) and the second sand core metal mold (5) located on the first mold plate (11) are provided with positioning core heads.

6. The vertical split casting mold for a suspension swing arm according to claim 1, characterized in that: The first mold plate (11) is provided with an exhaust hole (18), and the exhaust hole (18) is located above the first casting mold (14).

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