Low pressure casting mold telescopic weight reduction mechanism
By introducing a telescopic weight reduction mechanism into the low-pressure casting mold, the problem of difficult demolding of aluminum alloy wheel hub grooves in traditional molds has been solved, realizing efficient and automated production, improving yield and metal utilization, and reducing production costs.
Patent Information
- Application Number
- CN202522083043.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-28
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-28
AI Technical Summary
Traditional low-pressure casting molds result in high resistance, low success rate, low metal utilization, and high production costs when manufacturing aluminum alloy wheels with grooved structures. They also make it difficult to achieve optimized material forming.
Design a telescopic weight reduction mechanism for low-pressure casting molds. By setting telescopic blocks and a drive gear system on the top mold, the automatic telescopic movement of the groove part can be realized. Combined with the opening and closing action of the die casting machine, the movement of the telescopic blocks is automatically controlled, avoiding the need for an independent drive system.
It improves the success rate of demolding and the yield of finished castings, reduces mold wear and production costs, increases metal utilization, enhances production continuity and product qualification rate, and is suitable for large-scale mass production.
Smart Images
Figure CN224673779U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of low-pressure casting mold technology for aluminum alloy wheel hubs, and in particular to a telescopic weight reduction mechanism for low-pressure casting molds. Background Technology
[0002] As the automotive industry rapidly evolves towards lightweighting and low-energy consumption, low-pressure cast aluminum alloy wheels have become the mainstream wheel manufacturing solution due to their superior mechanical properties, lightweight advantages, and excellent forming precision. To further explore lightweight potential, some wheel designs incorporate groove structures in the rim area to optimize material usage. However, this structure faces significant technical bottlenecks in traditional manufacturing processes: mold design is limited by draft angle requirements, preventing the groove structure from being formed in its optimal shape. This not only increases resistance and reduces success rate during demolding but also leads to decreased metal utilization (high proportion of ineffective metal) and a surge in subsequent machining. These drawbacks directly restrict improvements in production efficiency and manufacturing cost control, becoming a critical technical challenge that the industry urgently needs to overcome. Therefore, there is an urgent need to develop a mold structure that can realize the pre-casting of grooves. By breaking through the limitations of traditional mold release, the groove part can be directly formed, thereby solving the problems of difficult demolding, low material utilization and high processing cost, and providing technical support for lightweight wheel hub manufacturing. Utility Model Content
[0003] The purpose of this utility model is to address the above-mentioned problems by providing a telescopic weight reduction mechanism for low-pressure casting molds. The technical solution adopted by this utility model is as follows: A telescopic weight reduction mechanism for a low-pressure casting mold includes a top mold. A telescopic block is movably connected to the top mold corresponding to a groove on a wheel hub blank. A through hole is provided on the top mold corresponding to the groove on the wheel hub blank. The telescopic block is slidably connected in the through hole. A driven rack is radially provided at the tail end of the telescopic block. A drive gear is rotatably connected in the back cavity of the top mold. A drive rod is provided corresponding to the drive gear. A drive rack is provided on the drive rod. The driven rack and the drive rack are respectively meshed and connected to both sides of the drive gear.
[0004] Preferably, the upper end of the drive rod is fixedly connected to the top plate of the die-casting machine. The opening and closing action of the mold by the up and down movement of the top plate drives the drive rod to reciprocate linearly, thereby realizing the automatic extension and retraction of the telescopic block.
[0005] Preferably, a guide post is provided in the back cavity of the top mold corresponding to the lower end of the drive rod, and a guide hole is opened at the lower end of the drive rod. The guide post is axially slidably connected in the guide hole.
[0006] Preferably, a guide block is provided on the side of the telescopic block along the direction of movement of the telescopic block, and a groove is opened in the through hole of the top mold corresponding to the guide block, and the guide block is slidably connected to the groove.
[0007] Preferably, a positioning stop is provided in the through hole, and a limiting boss is provided on the telescopic block. When the telescopic block is in the ejection forming position, the limiting boss abuts against the positioning stop to form a limiting fit. The beneficial effects of this utility model are as follows: This invention solves the demolding problem of grooved wheel shapes, improving demolding success rate and casting yield, and reducing casting damage and mold wear caused by demolding difficulties. Simultaneously, this embodiment allows the grooved portion of the wheel hub blank to be directly formed through mold design, eliminating the need for traditional forming methods that require extensive machining to remove ineffective metal, thus improving metal utilization and reducing production costs. By linking with the existing top platen of the die-casting machine, fully automatic control of the telescopic block is achieved, eliminating the need for an independent drive system and reducing equipment complexity and maintenance costs. The action response is synchronized with the mold opening and closing rhythm, avoiding forming defects or demolding failures caused by timing deviations, improving production continuity and product qualification rate. Automated operation reduces manual operation, lowers labor intensity, and is suitable for large-scale batch production needs. Attached Figure Description
[0008] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0009] Figure 1 This is a schematic diagram of the structure of this utility model.
[0010] Figure 2 for Figure 1 Enlarged structural diagram at point A (expanding block in the extended state).
[0011] Figure 3 This is a schematic diagram of the structure of the telescopic block in its retracted state when the mold is opened.
[0012] In the diagram: 10--Top mold; 11--Through hole; 12--Positioning stop; 13--Guide post; 20--Telescopic block; 21--Driven rack; 22--Guide block; 23--Limiting boss; 30--Drive gear; 40--Drive rod; 41--Drive rack; 42--Guide hole; 50--Top plate. Detailed Implementation
[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0014] like Figure 1-3As shown, a telescopic weight reduction mechanism for a low-pressure casting mold includes a top mold 10. A telescopic block 20 is movably connected to the top mold 10 corresponding to the groove portion of the wheel hub blank. The outer edge of the telescopic block 20 is conformally formed according to the contour of the groove portion of the wheel hub blank, serving as the forming structure for the inner rim groove portion of the wheel hub blank. Through the movable connection between the telescopic block 20 and the top mold 10, the radial dimension of the top mold 10 corresponding to the groove portion of the wheel hub blank is adjustable, thereby eliminating the obstruction of the groove portion to the wheel hub blank demolding. Specifically, the top mold 10 has a through hole 11 corresponding to the groove portion of the wheel hub blank, and the telescopic block 20 is slidably connected within the through hole 11. A driven rack 21 is radially arranged at the tail end of the telescopic block 20, and a drive gear 30 is rotatably connected within the back cavity of the top mold 10. A drive rod 40 is provided corresponding to the drive gear 30, and a drive rack 41 is provided on the drive rod 40. The driven rack 21 and the drive rack 41 are respectively meshed and connected to both sides of the drive gear 30. By driving the rack 41 to reciprocate, the drive gear 30 can be rotated, thereby driving the driven rack 21 to reciprocate, realizing the telescopic block 20's telescopic movement within the through hole 11.
[0015] During casting, the telescopic block 20 is in the initial position, serving as the forming structure for the inner rim groove of the wheel hub blank. When the mold is opened, the drive rod 40 is pushed down, and the drive gear 30 rotates under the meshing transmission of the drive rack 41, while simultaneously driving the driven rack 21 up, thereby causing the telescopic block 20 to retract and detach from the wheel hub blank within the through hole 11, effectively avoiding the groove on the wheel hub blank and ensuring that the wheel hub blank is smoothly removed.
[0016] This embodiment solves the demolding problem of grooved wheel shapes, improves the demolding success rate and casting yield, and reduces casting damage and mold wear caused by demolding difficulties. At the same time, the application of this embodiment can directly shape the groove part of the wheel blank through mold design, avoiding the traditional forming method of removing ineffective metal through a large amount of machining operations, thereby improving metal utilization and reducing production costs.
[0017] In a preferred embodiment, the upper end of the drive rod 40 is fixedly connected to the top plate 50 of the die-casting machine. The opening and closing motion of the top plate 50 drives the drive rod 40 in reciprocating linear motion, thereby achieving the automatic extension and retraction of the telescopic block 20. During mold opening, the top plate 50 drives the drive rod 40 downwards, and the drive gear 30 rotates under the meshing transmission of the drive rod 40 and the drive rack 41, simultaneously driving the driven rack 21 upwards, causing the telescopic block 20 to retract within the through hole 11. During mold closing, the top plate 50 returns, driving the drive rod 40 upwards, and the drive rack 41 drives the drive gear 30 to rotate, driving the driven rack 21 downwards, causing the telescopic block 20 to be ejected within the through hole 11, forming the molding structure of the inner rim groove portion of the wheel hub blank. This embodiment utilizes the mold opening and closing action to achieve automatic retraction or ejection of the telescopic block 20, eliminating the need for additional drive devices, simplifying the overall mold structure, and reducing equipment modification costs; at the same time, it links the telescopic action with the mold opening and closing process to ensure precise matching of action timing, improve the level of automated production, reduce manual intervention, and increase production efficiency.
[0018] Preferably, a guide post 13 is provided in the back cavity of the top mold 10 corresponding to the lower end of the drive rod 40, and a guide hole 42 is opened at the lower end of the drive rod 40. The guide post 13 is axially slidably connected in the guide hole 42. The cooperation structure between the guide post 13 and the guide hole 42 provides precise motion trajectory constraints for the drive rod 40, effectively suppresses the radial wobble of the drive rod 40 in reciprocating motion, ensures the meshing accuracy of the drive rack 41 and the drive gear 30, ensures the linear stability of the drive rod 40's movement, improves the control accuracy of the telescopic block 20's telescopic amount, and thus ensures the consistency of the groove forming dimensions.
[0019] Preferably, a guide block 22 is provided on the side of the telescopic block 20 along the direction of movement of the telescopic block 20, and a groove is opened in the through hole 11 of the top mold 10 corresponding to the guide block 22, and the guide block 22 is slidably connected to the groove. The cooperation between the guide block 22 and the groove further enhances the movement guidance of the telescopic block 20, effectively prevents the telescopic block 20 from swaying or getting stuck during sliding, ensures its precise radial extension and contraction, and guarantees the stability of the movement.
[0020] Preferably, a positioning stop 12 is provided in the through hole 11, and a limiting boss 23 is provided on the telescopic block 20. When the telescopic block 20 is in the ejection forming position, the limiting boss 23 abuts against the positioning stop 12 to form a limiting fit, which is used to limit the maximum ejection stroke of the telescopic block 20 and avoid over-travel. At the same time, it ensures the consistency of the position of the telescopic block 20 after each ejection, and improves the forming accuracy and stability of the groove. The above-disclosed embodiments are merely specific examples of this utility model, but this utility model is not limited thereto. For those skilled in the art, any modifications made without departing from the principle of this utility model should be considered as protected by this utility model.
Claims
1. A telescopic weight reduction mechanism for low-pressure casting molds, characterized in that: The device includes a top mold (10), on which a telescopic block (20) is movably connected to the groove of the wheel hub blank. A through hole (11) is opened on the top mold (10) corresponding to the groove of the wheel hub blank. The telescopic block (20) is slidably connected in the through hole (11). A driven rack (21) is arranged radially at the tail end of the telescopic block (20). A drive gear (30) is rotatably connected in the back cavity of the top mold (10). A drive rod (40) is arranged corresponding to the drive gear (30). A drive rack (41) is arranged on the drive rod (40). The driven rack (21) and the drive rack (41) are respectively meshed and connected on both sides of the drive gear (30).
2. The low-pressure casting mold telescopic weight reduction mechanism according to claim 1, characterized in that: The upper end of the drive rod (40) is fixedly connected to the die-casting machine top plate (50). Through the opening and closing action of the top plate (50) moving up and down, the drive rod (40) is driven to reciprocate linearly, thereby realizing the automatic extension and retraction action of the telescopic block (20).
3. The low-pressure casting mold telescopic weight reduction mechanism according to claim 1, characterized in that: A guide post (13) is provided at the lower end of the drive rod (40) in the back cavity of the top mold (10). A guide hole (42) is provided at the lower end of the drive rod (40). The guide post (13) is axially slidably connected in the guide hole (42).
4. The low-pressure casting mold telescopic weight reduction mechanism according to claim 1, characterized in that: The side of the telescopic block (20) is provided with a guide block (22) along the direction of movement of the telescopic block (20). The through hole (11) of the top mold (10) is provided with a groove corresponding to the guide block (22), and the guide block (22) is slidably connected to the groove.
5. The low-pressure casting mold telescopic weight reduction mechanism according to claim 1, characterized in that: The through hole (11) is provided with a positioning stop (12), and the telescopic block (20) is provided with a limiting boss (23). When the telescopic block (20) is in the ejection forming position, the limiting boss (23) abuts against the positioning stop (12) to form a limiting fit.