Cylinder end cover die-casting die

Abstract

The utility model provides an air cylinder end cover die-casting mould which comprises a movable mould and a fixed mould, the fixed mould and the movable mould are closed to form a mould cavity and a casting system, an air cylinder end cover mould core is arranged in the mould cavity, the mould cavity is respectively provided with lug overflow cavities corresponding to the outside of each mounting lug in a one-to-one correspondence mode, and the mould cavity is respectively provided with lug exhaust grooves corresponding to the outside of each mounting lug in a one-to-one correspondence mode. Redundant molten metal at the position of the mounting lug flows to the lug overflow cavity to be stored, and generated gas passes through the lug overflow cavity and then is exhausted through the lug exhaust groove. According to the utility model, the lug overflow cavities and the lug overflow grooves are additionally designed aiming at the thickness change, so that the problem of shrinkage caused by the thickness change at the position of the mounting lug can be effectively reduced. Meanwhile, aiming at the side wall of the air cylinder end cover, a pouring gate communication position and a push-out mechanism position are reasonably arranged, and a side wall overflow cavity and a side overflow groove are correspondingly designed on the outer side of other side walls without special effects, so that a flowing-out runner and a gas discharging runner of molten metal are optimized, and the die-casting forming quality of the air cylinder end cover is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to die manufacturing especially the technical field of cylinder end cover die manufacturing, especially a cylinder end cover die casting die. BACKGROUND

[0002] The die casting die is a die for liquid metal die casting forming, usually comprising two parts of a movable die and a fixed die. The movable die and the fixed die are closed to form a cavity, which is used for die casting to form the outer surface of the die casting, and a core is arranged in the cavity for die casting to form the inner surface of the die casting. At the same time, when the movable die and the fixed die are closed, a casting system for metal liquid to enter and fill the cavity is also formed, and the runner of the casting system is used to connect the pressure chamber and the cavity.

[0003] In the process of die casting forming of the die casting die, in addition to meeting the requirements of casting forming, the storage requirements of gas and excess metal liquid generated in the die casting process also need to be considered according to the forming requirements of different die castings.

[0004] When producing the cylinder end cover, in the design of the ordinary die casting die, only the cylinder end cover is considered, and the cooperation of the conventional cavity and core is designed according to the shape of the cylinder end cover. However, for the cylinder end cover, a structure of mounting ear for mounting and fixing the cylinder is usually arranged on the circumference of the cylinder end cover, and a mounting hole needs to be formed on the mounting ear to be fixed and mounted with the corresponding mounting position through the cooperation of the mounting hole and the bolt. There is a large thickness difference in the filling process from the side wall of the cylinder end cover to the mounting ear, and the thickness of the mounting ear is relatively thin, while the thickness of the side wall of the cylinder cover (in the direction of the thickness of the mounting ear) is relatively thick. During the casting process, the large thickness difference will cause the cooling speed to change, and shrinkage holes and shrinkage porosity will be generated near the thin-walled part due to the uneven thermal shrinkage.

[0005] The defects such as shrinkage holes will not only affect the material properties such as strength and toughness of the cylinder end cover at the position, but also may cause serious problems such as cracks and fractures, which will affect the quality of the cylinder end cover and cause poor installation reliability of the cylinder end cover. INVENTION CONTENTS

[0006] The technical problem to be solved by the utility model is that in order to overcome the shortcomings of the prior art, the utility model provides a cylinder end cover die casting die, which is designed according to the thickness change of the mounting ear position, an overflow cavity is designed separately, the overflow cavity is used to effectively guide the directional overflow of the metal liquid, a gas exhaust groove is designed correspondingly, the gas discharge is effectively guided, the formation of shrinkage holes is reduced, and the die casting forming quality of the cylinder end cover is effectively improved.

[0007] The utility model discloses a technical scheme that solves its technical problem is: a cylinder end cover die casting die, including movable mould and fixed mould, the fixed mould with movable mould closed constitute the cavity and the casting system, the cavity be equipped with cylinder end cover core, this cylinder end cover die casting die is used to cast a kind of cylinder end cover, the cylinder end cover has mounting lug peripherally, and mounting lug is through and is provided with mounting hole, the casting system includes sprue, and one end of the sprue is communicated with pressure chamber, and the other end is communicated with cavity;The cavity is respectively one-to-one corresponding and is provided with ear overflow cavity outside each mounting lug, and the cavity is respectively one-to-one corresponding and is provided with ear exhaust groove outside each mounting lug, and the metal liquid of redundant position at mounting lug flows to ear overflow cavity storage, and the gas generated then is discharged through ear exhaust groove after passing through ear overflow cavity.

[0008] In the above scheme, for the problem that the thickness difference at the mounting lug position is easy to cause shrinkage, overflow cavity is designed outside the mounting lug, and the overflow cavity is further connected with the exhaust groove. During casting, the excess metal liquid flows through the cavity at the mounting lug position, and then is stored in the ear overflow cavity. In this process, on the one hand, the ear overflow cavity performs its basic function to provide storage space for the metal liquid. On the other hand, since the excess metal liquid needs to pass through the mounting lug position to enter the ear overflow cavity, the metal liquid will continuously pass through the mounting lug position during the molding process. Therefore, the mounting lug position will not cool down too early, and can be cooled down synchronously with the position of the thicker side wall, thereby reducing the shrinkage caused by uneven thermal contraction. Moreover, the excess gas is discharged through the exhaust groove after passing through the overflow cavity from the mounting lug position. The guidance of the overflow cavity and the exhaust groove can also guide the gas to be discharged, thereby avoiding the formation of bubbles at the mounting lug position and affecting the final molding quality.

[0009] Further, the cylinder end cover is peripherally distributed with four mounting lugs, and the cavity is correspondingly provided with four groups of ear exhaust grooves. The cylinder end cover has four side walls between any two adjacent mounting lugs, wherein the cavity position corresponding to any one side wall is communicated with the sprue, and the cavity outside the other side wall is provided with a push-out mechanism. The push rod of the push-out mechanism pushes out the molded cylinder end cover from the cavity after casting, and the remaining two side walls are non-working side walls.

[0010] Further, the cavity is respectively one-to-one corresponding and is provided with side wall overflow cavity at each non-working side wall of the cylinder end cover, and the cavity is respectively one-to-one corresponding and is provided with side wall exhaust groove at each non-working side wall of the cylinder end cover. The excess metal liquid at the position of the non-working side wall flows to the side wall overflow cavity for storage, and the gas generated then is discharged through the side wall exhaust groove after passing through the side wall overflow cavity. The further design of the overflow cavity and the exhaust groove outside the non-working side wall can further optimize the storage space of the metal liquid, guide the discharge of the gas, and further improve the die casting molding quality of the cylinder end cover.

[0011] Further, the ear overflow cavity and the side wall overflow cavity are in inverted conical frustum structure, the connecting through positions of the ear exhaust groove with the ear overflow cavity and the side wall exhaust groove with the side wall overflow cavity are located at the side wall of the inverted conical frustum structure, and the positions are located above the middle part of the side wall in the height direction. Through the cavity form design of the overflow cavity and the height design of the exhaust groove, the overflow cavity can provide storage space for the excess metal liquid and can avoid the metal liquid entering the exhaust groove to cause exhaust blockage.

[0012] Further, the cavity and the ear overflow cavity and the cavity and the side wall overflow cavity are connected through downward inclined overflow guide slopes; the ear overflow cavity and the ear exhaust groove and the side wall overflow cavity and the side wall overflow groove are directly connected through upward inclined exhaust guide slopes. Through the setting of the two different direction guide slopes, the flow direction of the metal liquid and the gas is guided by the downward inclined overflow guide slope during overflow, and the gas is guided to climb and discharge along the upward inclined exhaust guide slope during exhaust, which can further reduce the exhaust blockage caused by the metal liquid entering the exhaust groove.

[0013] The cylinder end cover pressure casting mold provided by the utility model has the advantages of reasonable structure design, ear overflow cavities and ear overflow grooves designed according to the thickness change, which can effectively reduce the shrinkage hole problem caused by the thickness change at the installation ear position. Meanwhile, the runner communication position and the ejection mechanism position are reasonably arranged according to the side wall of the cylinder end cover, and the side wall overflow cavities and the side overflow grooves are designed on the outer sides of other side walls without special functions, which further optimizes the metal liquid outflow and the gas discharge flow channel, and is favorable for improving the pressure casting forming quality of the cylinder end cover. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model will be further explained in connection with the drawings and examples.

[0015] Figure 1 is the structure schematic diagram of the utility model embodiment.

[0016] Figure 2 is Figure 1 is the sectional view of A-A in the utility model.

[0017] Figure 3 is the perspective view of the utility model embodiment after removing part of the parts and exposing the overflow cavity and the exhaust groove.

[0018] Figure 4 is Figure 3 is the enlarged schematic view of B in the utility model.

[0019] In the figure: 1. Fixed mold mounting plate; 2. Fixed mold; 3. Moving mold; 4. Moving mold mounting plate; 5. Side wall overflow cavity; 6. Side wall venting groove; 7. Sprue; 8. Ear overflow cavity; 9. Ear venting groove; 10. Ejection mechanism; 11. Overflow guide slope; 12. Venting guide slope. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0021] Example 1

[0022] like Figure 1 and Figure 2 The cylinder end cap die-casting mold shown is an embodiment of this utility model.

[0023] This cylinder end cap die-casting mold is used for die-casting cylinder end caps. The cylinder end cap has four mounting ears distributed circumferentially, each with a through mounting hole. Each adjacent mounting ear has four sidewalls. Along the axial direction of the cylinder end cap, the thickness of the mounting ears is less than the thickness of the sidewalls, resulting in a significant thickness difference between the sidewalls and the mounting ears. Therefore, for the cylinder end caps produced in this embodiment, shrinkage cavities are easily generated in and around the mounting ears unless otherwise designed.

[0024] Specifically, the cylinder end cap die-casting mold provided in this embodiment includes a moving mold mounting plate 4, a fixed mold mounting plate 1, a moving mold 3, and a fixed mold 2. The moving mold 3 is mounted on the moving mold mounting plate 4, and the fixed mold 2 is mounted on the fixed mold mounting plate 1. The fixed mold 2 and the moving mold 3 cooperate to close and form a cavity and a casting system.

[0025] The cavity contains a cylinder end cap core, and the casting system includes a gating system 7, one end of which is connected to the pressure chamber, and the other end of which is connected to the cavity.

[0026] In this embodiment, an ear overflow cavity 8 is provided corresponding to each mounting ear, and an ear venting groove 9 is provided corresponding to each mounting ear. The ear overflow cavity 8 is continuously provided outside the cavity corresponding to the mounting ear, while the ear venting groove 9 is continuously provided outside the ear overflow cavity 8. Excess molten metal at the mounting ear position flows into the ear overflow cavity 8 for storage, and the generated gas is discharged through the ear overflow cavity 8 and then through the ear venting groove 9.

[0027] Thus, to address the issue of shrinkage cavities caused by thickness differences at the mounting ear location, an overflow cavity combined with a venting groove is used. During casting, excess molten metal passes through the cavity at the mounting ear location and is stored in the overflow cavity 8. In this process, the overflow cavity 8 performs its basic function, providing storage space for excess molten metal. Simultaneously, this overflow cavity 8 also has an unexpected technical effect: excess molten metal needs to enter the overflow cavity 8 after passing through the mounting ear location. During molding, the molten metal continuously passes through the mounting ear location, and the heat carried by the molten metal prevents premature cooling at the mounting ear location. This avoids premature cooling of the mounting ear, allowing it to cool synchronously with the thicker sidewalls, thereby reducing uneven thermal shrinkage and shrinkage cavities. Excess gas also passes through the overflow cavity at the mounting ear location and is discharged through the venting groove. The overflow cavity and venting groove guide the gas outwards, preventing the formation of air bubbles at the mounting ear location, which would affect the final molding quality.

[0028] Building upon this foundation, further design can be implemented for the four side walls. First, the requirement for the runner 7 to be connected must be met, meaning that the cavity corresponding to any one of the four side walls must be connected to the runner 7. Second, it is necessary to ensure that the die-cast part can be effectively ejected after casting; that is, an ejection mechanism 10 is provided outside the cavity corresponding to another side wall, and the push rod of the ejection mechanism 10 pushes the formed cylinder end cap out of the cavity after casting. The remaining two side walls are non-working side walls and can be further designed to provide design space for improving die-casting quality.

[0029] Each non-working sidewall of the cylinder end cover is provided with a sidewall overflow cavity 5, and each non-working sidewall of the cylinder end cover is provided with a sidewall venting groove 6. Similar to the arrangement of the ear overflow cavity 8 and ear venting groove 9, the sidewall overflow cavities 5 are successively located outside the corresponding sidewall cavity, and the sidewall venting grooves 6 are successively located outside the sidewall overflow cavities. Excess molten metal at the non-working sidewall location flows to the sidewall overflow cavity 5 for storage, and the generated gas is discharged through the sidewall overflow cavity 5 and then through the sidewall venting groove 6. Further designing overflow cavities and venting grooves on the outside of the non-working sidewalls can further optimize the storage space of the molten metal, guide the gas discharge, and further improve the die-casting quality of the cylinder end cover.

[0030] Example 2:

[0031] Based on Embodiment 1, to prevent excess molten metal from entering the venting channel from the overflow cavity, Embodiment 2 further improves the structure of the connection inlet position between the venting channel and the overflow cavity. Specifically, the design principles of the ear venting channel 9 and the side wall venting channel 6, and the ear overflow cavity 8 and the side wall overflow cavity 5 are consistent.

[0032] Specifically, such as Figure 3As shown in Embodiment 2, both the ear overflow cavity 8 and the sidewall overflow cavity 5 are inverted frustum-shaped structures. The connection point between the ear vent 9 and the ear overflow cavity 8, and between the sidewall vent 6 and the sidewall overflow cavity 5, is located on the sidewall of the inverted frustum-shaped structure, specifically above the middle of the sidewall in the height direction. The cavity of the inverted frustum-shaped structure can store excess molten metal. Simultaneously, the relatively high height of the vent troughs, with their elevated design, guides the gas flow during exhaust, preventing excess molten metal from entering the vent trough for cooling and causing exhaust blockage.

[0033] Example 3:

[0034] Example 3, based on Example 2, further improves the guide structure between the cavity and the overflow cavity, and between the overflow cavity and the exhaust groove.

[0035] Specifically, such as Figure 3 and Figure 4 As shown, the cavity and the ear overflow cavity 8, and the cavity and the side wall overflow cavity 5 are connected by a downwardly sloping overflow guide slope 11. The ear overflow cavity 8 and the ear exhaust groove 9, and the side wall overflow cavity 5 and the side wall overflow groove are directly connected by an upwardly sloping exhaust guide slope 12.

[0036] By setting two guide ramps in different directions, the downward overflow guide ramp 11 guides the flow of molten metal and gas during overflow, while the upward exhaust guide ramp 12 guides the gas to rise and be discharged during exhaust. The upward exhaust guide ramp 12 also has a good blocking and limiting effect on the molten metal, which can further reduce exhaust blockage caused by molten metal entering the exhaust tank.

[0037] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A cylinder head die-casting mold comprising a movable mold (3) and a stationary mold (2), said stationary mold (2) and movable mold (3) being closed to form a mold cavity and a casting system, said mold cavity being provided with a cylinder head core, the cylinder head die-casting mold being used for casting a cylinder head, the cylinder head having mounting ears in the circumferential direction, mounting holes being formed through the mounting ears, characterized in that: The casting system comprises a sprue (7) which is communicated with a compression chamber at one end and communicated with a cavity at the other end; the cavity is provided with an ear overflow cavity (8) corresponding to each mounting ear; the cavity is provided with an ear exhaust groove (9) corresponding to each mounting ear; the excess metal liquid at the mounting ear position flows to the ear overflow cavity (8) for storage, and the generated gas is discharged through the ear exhaust groove (9) after passing through the ear overflow cavity (8); the excess metal liquid flows through the mounting ear position to avoid early cooling of the mounting ear position. ​ 2. The cylinder head die-casting mold according to claim 1, characterized in that: The cylinder head cover is circumferentially distributed with four mounting ears, and the cavity is correspondingly provided with four groups of ear exhaust grooves (9); The cylinder head cover is correspondingly provided with four side walls between the adjacent two mounting ears, wherein the cavity position corresponding to any one side wall is communicated with the sprue (7), the cavity outside the other side wall is provided with a push-out mechanism (10), the push rod of the push-out mechanism (10) pushes out the formed cylinder head cover from the cavity after casting, and the other two side walls are non-working side walls.

3. The cylinder head die-casting mold according to claim 2, characterized in that: The cavity is correspondingly provided with a side wall overflow cavity (5) corresponding to each non-working side wall of the cylinder head cover, and the cavity is correspondingly provided with a side wall exhaust groove (6) corresponding to each non-working side wall of the cylinder head cover; the excess metal liquid at the non-working side wall position flows to the side wall overflow cavity (5) for storage, and the generated gas is discharged through the side wall exhaust groove (6) after passing through the side wall overflow cavity (5).

4. The cylinder head die-casting mold according to claim 3, characterized in that: The ear overflow cavity (8) and the side wall overflow cavity (5) are both inverted frustum structures, the connection positions of the ear exhaust groove (9) with the ear overflow cavity (8) and the side wall exhaust groove (6) with the side wall overflow cavity (5) are located on the side wall of the inverted frustum structure, and the positions are above the middle of the side wall in the height direction.

5. The cylinder head die-casting mold according to claim 4, characterized in that: The cavity and the ear overflow cavity (8) and the cavity and the side wall overflow cavity (5) are connected through downward inclined overflow guide slopes (11); the ear overflow cavity (8) and the ear exhaust groove (9) and the side wall overflow cavity (5) and the side wall exhaust groove are directly connected through upward inclined exhaust guide slopes (12).

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