Upper die ejection mechanism of hub gravity casting die

Abstract

The utility model relates to an upper die ejection mechanism of a hub gravity casting die, which comprises an upper die and a lower die, a cavity is formed between the upper die and the lower die, an annular pressing plate is arranged at the top of the upper die corresponding to the peripheral side of a pouring gate, a plurality of adjusting screw rods which are vertically arranged and are in threaded connection with the top of the upper die are uniformly arranged on the annular pressing plate in a penetrating manner, and the adjusting screw rods are in threaded connection with the top of the upper die. An elastic piece is arranged between the upper end of the adjusting screw rod and the annular pressing plate, a plurality of force storage rods which penetrate through the upper die and avoid the cavity to abut against the lower die are arranged on the side, corresponding to the adjusting screw rod, of the bottom of the annular pressing plate, and a plurality of ejector rods which penetrate through the upper die and can move into the cavity are arranged on the other side, corresponding to the adjusting screw rod, of the bottom of the annular pressing plate. The utility model has the characteristics that defects and flaws of the workpiece caused by overlarge pressure action on the formed workpiece can be effectively avoided, the forming quality of the workpiece is ensured, and the like.

Description

Technical Field

[0001] The utility model relates to an upper die ejection mechanism of a wheel hub gravity casting die, belonging to the technical field of wheel hub casting dies. Background Art

[0002] Motorcycle wheel hubs have various shapes. Many products have a small draft angle, so they are easy to adhere to the upper mold during the mold opening process and are difficult to detach as the upper mold moves. The products are prone to sudden drop, affecting the integrity of the product and even causing danger.

[0003] A Chinese patent application with publication number CN210702461U discloses an upper die ejection device for a die-casting mold, comprising an upper die ejector rod fixing plate and an upper die push plate arranged above the upper die, a cover plate is arranged above the upper die push plate, a plurality of ejector rods are fixedly connected to one side of the upper die ejector rod fixing plate, the ejector rods pass through the upper die and extend into the cavity of the mold, a plurality of upper spring mounting holes are arranged on the upper die push plate, a plurality of lower spring mounting holes aligned with the upper spring mounting holes are arranged on the upper die ejector rod fixing plate; the aperture of the upper spring mounting hole is larger than the aperture of the lower spring mounting hole, a spring is arranged in the upper spring mounting hole, one end of the spring contacts the upper die ejector rod fixing plate, and the other end contacts the cover plate, the spring is sleeved on the spring guide rod, and the spring guide rod passes through the upper spring mounting hole and the lower spring mounting hole.

[0004] In the above-mentioned prior art, the upper mold is moved so that the push rod extends into the mold cavity relative to the upper mold to push the workpiece, so that the driving force when the workpiece is pushed is the moving force of the upper mold. If the driving force is too large, it is easy to squeeze the newly formed workpiece and cause local deformation of the workpiece, resulting in defects and flaws in the workpiece, affecting the molding quality of the workpiece. Utility Model Content

[0005] The utility model aims to provide an upper die ejection mechanism for a wheel hub gravity casting die, which solves the problems of defects and flaws in the demoulding of workpieces existing in the prior art.

[0006] The above technical objectives of the utility model are mainly solved by the following technical solutions: an upper mold ejection mechanism of a wheel hub gravity casting mold, comprising an upper mold and a lower mold, a mold cavity is formed between the upper mold and the lower mold, an annular pressure plate is arranged on the top of the upper mold corresponding to the surrounding side of the gate, a plurality of vertically arranged adjusting screws and threadedly connected to the top of the upper mold are evenly penetrated on the annular pressure plate, an elastic member is arranged between the upper end of the adjusting screw and the annular pressure plate, a plurality of storage rods that pass through the upper mold and avoid the mold cavity and abut against the lower mold are arranged on the bottom of the annular pressure plate corresponding to one side of the adjusting screw, and the bottom of the annular pressure plate corresponds to another side of the adjusting screw. One side is provided with a plurality of push rods which are inserted into the upper mold and can be moved into the mold cavity; the above-mentioned adjusting screw is fixed on the top of the upper mold, and cooperates with the annular pressure plate through an elastic member, so that the adjusting screw can exert force on the annular pressure plate through the elastic member, and the force storage rod abuts against the lower mold to form a support for the annular pressure plate, so that the annular pressure plate can squeeze and compress the elastic member, so that after the upper mold is detached, the reaction force of the elastic member on the pressure plate can drive the push rod to push the formed workpiece, thereby realizing the separation of the workpiece and the upper mold, which can effectively avoid defects and flaws in the workpiece caused by excessive pressure on the formed workpiece, thereby ensuring the forming quality of the workpiece.

[0007] Preferably, the elastic part is arranged on the peripheral side of the adjusting screw, and an adjusting nut is provided on the top of the adjusting screw, and the adjusting nut covers part of the elastic part; the setting of the above-mentioned adjusting nut can form a limit on the upper end of the elastic part to prevent the elastic part from detaching from the adjusting screw while ensuring that the elastic part can be squeezed and compressed by the annular pressure plate and automatically restored.

[0008] Preferably, an annular fixing plate is provided at the bottom of the annular pressure plate, and a first countersunk hole and a second countersunk hole are provided on the annular fixing plate for respectively fixing the top end of the force storage rod and the top end of the push rod; the above-mentioned annular fixing plate cooperates with the annular pressure plate to fix and limit the top end of the force storage rod and the top end of the push rod through the first countersunk hole and the second countersunk hole, thereby ensuring that the force storage rod and the push rod are more reliable when they act, and can stably support the annular pressure plate and the push-forming workpiece, while facilitating assembly.

[0009] Preferably, the annular pressure plate covers the first countersunk hole and the second countersunk hole, and the annular pressure plate and the annular fixing plate are connected and fixed by locking bolts; the annular pressure plate covers the first countersunk hole and the second countersunk hole to facilitate limiting the position above the first countersunk hole and the second countersunk hole, and the annular pressure plate and the annular fixing plate are connected by locking bolts to form a fixed limit for the force storage rod and the push rod, thereby preventing the force storage rod and the push rod from loosening and facilitating assembly.

[0010] Preferably, the annular pressure plate and the annular fixing plate are respectively provided with a first through hole and a second through hole coaxially arranged with each other in the middle, and a retaining ring located inside the first through hole and the second through hole is provided on the surrounding side of the gate at the top of the upper mold; the first through hole and the second through hole are arranged to form an avoidance at the gate to avoid interfering with the entry of the molten metal, and the retaining ring is used to block the splashing of the molten metal when it enters the cavity.

[0011] Therefore, the utility model has the characteristics of being able to effectively avoid excessive pressure on the formed workpiece, which may cause defects and flaws in the workpiece, and ensuring the forming quality of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] Figure 2 yes Figure 1 A top view of the annular pressure plate in FIG.

[0014] Figure 3 yes Figure 1 Structural cross-sectional view of the annular pressure plate and the annular fixing plate. DETAILED DESCRIPTION

[0015] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0016] like Figure 1-2 As shown, an upper mold ejection mechanism of a wheel hub gravity casting mold comprises an upper mold 1 and a lower mold 2, a cavity 3 is formed between the upper mold 1 and the lower mold 2, an annular pressing plate 4 is arranged on the top of the upper mold 1 corresponding to the surrounding side of the gate, a plurality of vertically arranged adjusting screws 5 which are threadedly connected to the top of the upper mold 1 are evenly penetrated on the annular pressing plate 4, an elastic member 51 is arranged between the upper end of the adjusting screw 5 and the annular pressing plate 4, and a plurality of force storage members which pass through the upper mold 1 and avoid the cavity 3 and abut against the lower mold 2 are arranged on the bottom of the annular pressing plate 4 corresponding to one side of the adjusting screw 5 Rod 6, a plurality of ejector rods 7 are provided on the bottom of the annular pressure plate 4 corresponding to the other side of the adjusting screw 5, which are penetrated into the upper mold 1 and can be moved into the cavity 3, an elastic member 51 is provided on the peripheral side of the adjusting screw 5, an adjusting nut 52 is provided on the top of the adjusting screw 5, and the adjusting nut 52 covers part of the elastic member 51, a first through hole 42 and a second through hole 83 are respectively provided in the middle of the annular pressure plate 4 and the annular fixing plate 8, which are coaxially arranged with each other, and a retaining ring 11 located on the inner side of the first through hole 42 and the second through hole 83 is provided on the peripheral side of the gate at the top of the upper mold 1.

[0017] The above-mentioned upper mold and lower mold are combined with each other to form a cavity for forming a workpiece. The annular pressure plate is arranged on the side around the gate at the top of the upper mold, and the metal solution retaining ring at the gate is located on the inner side of the first through hole and the second through hole in the middle of the annular pressure plate. The upper end of the adjusting screw is threaded to fix the adjusting nut, and the lower end of the adjusting screw is tightened with the thread on the top of the upper mold. The adjusting screw is passed through the annular pressure plate, and the annular pressure plate can float up and down relative to the adjusting screw. The elastic member is arranged by a coil spring, and the elastic member is arranged between the adjusting nut and the annular pressure plate and is sleeved on the side around the adjusting screw. The annular pressure plate is supported above the upper mold by a force storage rod, and the bottom end of the force storage rod passes through the parting part of the upper mold and the lower mold (that is, the non-molding part of the wheel hub) and abuts against the lower mold for support, and the force storage rod does not enter the cavity.

[0018] The inner diameters of the first through hole and the second through hole of the annular pressure plate and the annular fixing plate are larger than the gate diameter and do not interfere with the entry of the cast metal solution. The thickness of the annular pressure plate and the annular fixing plate are between 15mm-20mm, and the diameter of the power storage rod is between 20mm-30mm. If the diameter is too small, it is easy to bend, and if the diameter is too large, it increases the difficulty of processing.

[0019] Before the workpiece is cast, the force storage rod supports the annular pressure plate, and the adjusting nut is turned at the same time. The annular pressure plate is supported by the force storage rod and is stable, and the elastic member is squeezed and compressed by the adjusting nut and the annular fixing plate. After the workpiece is cast, the upper mold is driven to separate from the lower mold, and the bottom end of the force storage rod is separated from the lower mold synchronously. The bottom end of the force storage rod has no external force support, and the elastic member releases the compressed energy to act on the annular pressure plate, so that the annular pressure plate pushes the ejector rod, and the ejector rod pushes the molded workpiece through the elastic force of the elastic member, so that the molded workpiece is quickly separated from the upper mold, and the workpiece is demolded.

[0020] like Figure 1 and 3 As shown, an annular fixing plate 8 is provided at the bottom of the annular pressure plate 4, and a first countersunk hole 81 and a second countersunk hole 82 are provided on the annular fixing plate 8 to respectively fix the top end of the power storage rod 6 and the top end of the push rod 7. The annular pressure plate 4 covers the first countersunk hole 81 and the second countersunk hole 82, and the annular pressure plate 4 and the annular fixing plate 8 are connected and fixed by a locking bolt 41.

[0021] The above-mentioned annular fixing plate is fitted with the bottom surface of the annular pressure plate and is connected and fixed by multiple locking bolts. The annular fixing plate is provided with multiple first countersunk holes and second countersunk holes that are evenly distributed and vertically penetrate the annular fixing plate. The upper end of the force storage rod and the upper end of the push rod are respectively matched with the first countersunk hole and the second countersunk hole, and are pressed tightly in the first countersunk hole and the second countersunk hole by the annular pressure plate. The lower ends of the force storage rod and the push rod extend from the bottom of the first countersunk hole and the second countersunk hole respectively.

Claims

1. An upper die ejection mechanism for a wheel hub gravity casting die, characterized in that: The invention comprises an upper die (1) and a lower die (2), wherein a cavity (3) is formed between the upper die (1) and the lower die (2), an annular pressing plate (4) is provided at the top of the upper die (1) corresponding to the periphery of the gate, a plurality of vertically arranged adjusting screws (5) are evenly penetrated on the annular pressing plate (4) and are threadedly connected to the top of the upper die (1), an elastic member (51) is provided between the upper end of the adjusting screw (5) and the annular pressing plate (4), a plurality of force storage rods (6) are provided at the bottom of the annular pressing plate (4) corresponding to one side of the adjusting screw (5), and the plurality of force storage rods (6) pass through the upper die (1) and avoid the cavity (3) to abut against the lower die (2), and a plurality of ejector rods (7) are provided at the bottom of the annular pressing plate (4) corresponding to the other side of the adjusting screw (5), and are penetrated in the upper die (1) and can be moved into the cavity (3).

2. The upper die ejection mechanism of the wheel hub gravity casting mold according to claim 1, characterized in that: The elastic member (51) is arranged on the peripheral side of the adjusting screw (5), and an adjusting nut (52) is arranged on the top of the adjusting screw (5), wherein the adjusting nut (52) covers a portion of the elastic member (51).

3. The upper die ejection mechanism of the wheel hub gravity casting mold according to claim 1, characterized in that: An annular fixing plate (8) is provided at the bottom of the annular pressure plate (4), and a first countersunk hole (81) and a second countersunk hole (82) are provided on the annular fixing plate (8) for fixing the top end of the force storage rod (6) and the top end of the push rod (7) respectively.

4. The upper die ejection mechanism of the wheel hub gravity casting mold according to claim 3, characterized in that: The annular pressure plate (4) covers the first countersunk hole (81) and the second countersunk hole (82), and the annular pressure plate (4) and the annular fixing plate (8) are connected and fixed by locking bolts (41).

5. The upper die ejection mechanism of the wheel hub gravity casting mold according to claim 3, characterized in that: A first through hole (42) and a second through hole (83) which are coaxially arranged with each other are respectively provided in the middle of the annular pressure plate (4) and the annular fixing plate (8), and a retaining ring (11) located inside the first through hole (42) and the second through hole (83) is provided around the gate at the top of the upper mold (1).

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