A windowless hub mold with a guided self-positioning mechanism

Abstract

The utility model discloses a windowless hub mould with guide self -positioning mechanism, including upper die and lower die who are opposite to each other, the opposite side of upper die and lower die forms respectively upper die cavity surface and lower die cavity surface, the cooperation of upper die cavity surface and lower die cavity surface is provided with the guide self -positioning mechanism for guiding and supporting upper die and lower die and centering and rectifying. Guide self -positioning mechanism includes at least two upper die bosses and the lower die positioning boss opposite to each other on it, be provided with upper die positioning recessed cavity on the upper die boss, the upper die boss sets up on upper die cavity surface, the lower die positioning boss sets up on lower die cavity surface.

Description

Technical Field

[0001] This utility model relates to the field of low-pressure casting wheel hub mold technology, and in particular to a windowless wheel hub mold with a guiding self-positioning mechanism. Background Technology

[0002] Low-pressure casting is one of the most commonly used production processes for aluminum alloy wheels due to its high production efficiency and superior quality. With the increasing application of aluminum alloy wheels, the demand for windowless wheels, such as those used in bus wheels, is also growing, in addition to conventional spoked wheels. In low-pressure casting, windowless wheels lack the auxiliary positioning structure of upper and lower mold spokes, relying solely on the four corners of the mold frame for positioning. Over time, wear on the guide pillars leads to misalignment of the upper and lower mold cavities, resulting in significant concentricity errors during mold closing and misalignment of the casting. Errors in the center bolt hole position exceed 0.5mm, affecting the machining yield. Furthermore, the center surface of windowless wheel castings is typically integral, causing the casting to float during water cooling after demolding, resulting in uneven cooling and hot water splashing. Therefore, improvements are needed. Summary of the Invention

[0003] This utility model aims to solve one of the technical problems existing in the prior art.

[0004] This utility model provides a windowless wheel hub mold with a self-positioning guiding mechanism, including an upper mold and a lower mold that are opposite each other. The upper mold and the lower mold have an upper mold cavity surface and a lower mold cavity surface respectively formed on opposite sides. The characteristic is that a self-positioning guiding mechanism for guiding and supporting the upper mold and the lower mold and for centering and correcting deviation is provided between the upper mold cavity surface and the lower mold cavity surface.

[0005] Preferably, the guide self-positioning mechanism includes at least two upper mold bosses and lower mold positioning bosses that are vertically opposite to them. The upper mold bosses are provided with upper mold positioning cavities, the upper mold bosses are disposed on the upper mold cavity surface, and the lower mold positioning bosses are disposed on the lower mold cavity surface.

[0006] Preferably, at least two upper mold bosses are arranged asymmetrically on the upper mold cavity surface, and at least two lower mold positioning bosses are arranged asymmetrically on the lower mold cavity surface.

[0007] Preferably, the lower mold positioning boss is provided with a lower mold positioning boss guide surface and a lower mold positioning boss positioning surface. The lower mold positioning boss guide surface is located on the outer ring of the lower mold positioning boss, and the lower mold positioning boss positioning surface is located on the top of the lower mold positioning boss. The upper mold boss is provided with an upper mold cavity top surface and an upper mold cavity conical surface. The upper mold cavity top surface is located inside the upper mold positioning cavity, and the upper mold cavity conical surface is located on the side of the upper mold positioning cavity. The upper mold cavity conical surface cooperates with the lower mold positioning boss guide surface to achieve center guidance of the upper and lower molds. The lower mold positioning boss positioning surface cooperates with the upper mold cavity top surface to achieve surface contact and complete the center self-guiding positioning of the upper and lower molds.

[0008] Preferably, at least two upper mold bosses are integrally formed on the upper mold cavity surface, and at least two lower mold positioning bosses are integrally formed on the lower mold cavity surface.

[0009] Preferably, the guide surface of the lower mold positioning boss is an arc surface, and the positioning surface of the lower mold positioning boss is a spherical surface.

[0010] Preferably, the spherical angle formed between the upper and lower ends of the positioning surface of the lower mold positioning boss in the vertical plane is set to be greater than 90° and less than 135°, and the center angle of the positioning surface of the lower mold positioning boss is set to be greater than the center angle of the top surface of the upper mold cavity.

[0011] Preferably, the angle range within the vertical plane formed by the positioning surface of the lower mold positioning boss and the contact surface of the top surface of the upper mold cavity is set between 75° and 80°. This angle range can ensure that when the mold undergoes slight deformation at high temperature, the two contact surfaces still maintain ≥80% of the effective contact area, so that the mold can still maintain good contact when it undergoes a certain amount of slippage during high temperature deformation.

[0012] Preferably, the upper mold boss and the lower mold positioning boss are each provided with three.

[0013] Preferably, two of the three upper mold bosses are symmetrically arranged, and the other one is asymmetrically arranged with respect to the two symmetrical bosses; two of the three lower mold positioning bosses are symmetrically arranged, and the other one is asymmetrically arranged with respect to the two symmetrical bosses.

[0014] The above-mentioned windowless wheel hub mold with a self-positioning guiding mechanism has the following advantages:

[0015] 1. A self-positioning guide mechanism is built directly on the mold body. The lower mold positioning boss and the upper mold positioning cavity are matched. The design of the arc conical surface matching has both guiding and correction capabilities. The spherical design of the lower mold positioning boss can realize automatic center calibration to complete the automatic centering of the upper and lower molds. The surface contact further improves the stability of the positioning structure and ensures that self-positioning can still be achieved in repeated work.

[0016] 2. The spherical angle formed between the upper and lower ends of the positioning surface of the lower mold positioning boss in the vertical plane is set to be greater than 90° and less than 135°. The angle range of the vertical plane formed by the positioning surface of the lower mold positioning boss and the contact surface of the top surface of the upper mold cavity is set between 75° and 80°. This angle range can ensure that when the mold undergoes slight deformation at high temperature, the two contact surfaces still maintain ≥80% of the effective contact area, so that the mold can still maintain good contact when it undergoes a certain amount of slippage during high temperature deformation, effectively reducing the impact of thermal deformation. The concentricity error of the upper and lower molds is ≤0.1mm.

[0017] 3. The center of the casting is naturally cast and formed with a conical through hole, which facilitates stable immersion in water for uniform cooling after demolding and avoids hot water splashing.

[0018] 4. At least two upper mold bosses are asymmetrically arranged on the upper mold cavity surface, and at least two lower mold positioning bosses are asymmetrically arranged on the lower mold cavity surface to avoid mold closing misalignment, eliminate assembly freedom, and achieve precise centering;

[0019] 5. When the upper and lower molds are closed, the positioning boss of the lower mold and the positioning cavity of the upper mold directly bear the impact force of mold closing, which improves the overall life of the mold and avoids the deformation problem of the upper mold bulging upward when the mold is at high temperature.

[0020] The beneficial effects of this invention will be explained in detail in the embodiments, thereby making the beneficial effects more obvious. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the specific structure of the upper and lower mold assembly in the embodiments of this application.

[0022] Figure 2 This is a three-dimensional schematic diagram of the specific structure of the upper mold in the embodiments of this application;

[0023] Figure 3 This is a three-dimensional schematic diagram of the specific structure of the lower mold in the embodiments of this application;

[0024] Figure 4 for Figure 1 A detailed cross-sectional view of the structure along the AA direction;

[0025] Figure 5 for Figure 4 A magnified schematic diagram of the specific structure at point B;

[0026] Figure 6 This is a partially enlarged cross-sectional view of the mating end faces of the upper and lower molds in an embodiment of this application.

[0027] 1-Upper mold, 2-Lower mold, 11-Upper mold positioning cavity, 13-Upper mold boss, 14-Upper mold cavity surface, 21-Lower mold positioning boss, 23-Lower mold cavity surface, 111-Top surface of upper mold cavity, 112-Conical surface of upper mold cavity, 211-Guide surface of lower mold positioning boss, 212-Positioning surface of lower mold positioning boss. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0029] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0030] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings, through specific examples and application scenarios.

[0031] Example 1:

[0032] like Figures 1-6 As shown, a windowless wheel hub mold with a self-positioning guide mechanism includes an upper mold 1 and a lower mold 2 that are positioned opposite each other. The upper mold 1 and the lower mold 2 have an upper mold cavity surface 14 and a lower mold cavity surface 23 respectively formed on their opposite sides. In a specific embodiment of this utility model, a self-positioning guide mechanism for guiding and supporting the upper mold 1 and the lower mold 2 and for centering and correcting deviation is provided between the upper mold cavity surface 14 and the lower mold cavity surface 23.

[0033] In a specific embodiment of this utility model, the guide self-positioning mechanism includes at least two upper mold bosses 13 and lower mold positioning bosses 21 that are vertically opposite to them. The upper mold bosses 13 are provided with upper mold positioning cavities 11. The upper mold bosses 13 are disposed on the upper mold cavity surface 14, and the lower mold positioning bosses 21 are disposed on the lower mold cavity surface 23.

[0034] In specific embodiments of this utility model, such as Figure 3As shown, the lower mold positioning boss 21 is provided with a lower mold positioning boss guide surface 211 and a lower mold positioning boss positioning surface 212. The lower mold positioning boss guide surface 211 is provided on the outer ring of the lower mold positioning boss 21, and the lower mold positioning boss positioning surface 212 is provided on the top of the lower mold positioning boss 21. The lower mold positioning boss guide surface 211 is an arc surface for guiding, and the lower mold positioning boss positioning surface 212 is a spherical surface.

[0035] In a specific embodiment of this utility model, the upper mold boss 13 is provided with an upper mold cavity top surface 111 and an upper mold cavity conical surface 112. The upper mold cavity top surface 111 is located inside the upper mold positioning cavity 11, and the upper mold cavity conical surface 112 is located on the side of the upper mold positioning cavity 11. The upper mold cavity conical surface 112 cooperates with the lower mold positioning boss guide surface 211 to realize the center guidance of the upper and lower molds. The lower mold positioning boss positioning surface 212 cooperates with the upper mold cavity top surface 111 to realize surface contact and complete the center self-guiding positioning of the upper and lower molds.

[0036] In a specific embodiment of this utility model, at least two upper mold bosses 13 are integrally formed on the upper mold cavity surface 14, and at least two lower mold positioning bosses 21 are integrally formed on the lower mold cavity surface 23. The integrally formed structure has higher strength and greater stability.

[0037] In specific embodiments of this utility model, such as Figure 5 As shown, the spherical angle formed between the upper and lower ends of the positioning surface 212 of the lower mold positioning boss in the vertical plane is set to be greater than 90° and less than 135°, and the center angle of the positioning surface 212 of the lower mold positioning boss is set to be greater than the center angle of the top surface 111 of the upper mold cavity.

[0038] In a specific embodiment of this utility model, the angle range within the vertical plane formed by the contact surface of the lower mold positioning boss 212 and the top surface 111 of the upper mold cavity is set between 75° and 80°. This angle range ensures that when the mold undergoes slight deformation at high temperatures, the two contact surfaces still maintain ≥80% of the effective contact area, allowing the mold to maintain good contact even when it slips due to high-temperature deformation. The lower mold positioning boss 212 cooperates with the top surface 111 of the upper mold cavity to complete the center guiding and positioning of the upper and lower molds, ensuring the coaxiality of the upper and lower molds. Figure 6 As shown, when the lower mold positioning boss 21 and the upper mold cavity 11 are engaged, they are in surface contact, ensuring the stability of the structural fit.

[0039] Due to the aforementioned structure, during a mold closing process, the upper mold 1 and lower mold 2 are initially positioned under the action of the mold frame. During the mold closing process, the lower mold positioning boss 21 on the lower mold 2 begins to contact the upper mold positioning cavity 11 on the upper mold 1. The guide surface 211 of the lower mold positioning boss contacts the conical surface 112 of the upper mold cavity. The arc surface structure achieves automatic calibration and automatically guides and corrects deviations under the action of the upper and lower mold closing forces. After the positioning surface 212 of the lower mold positioning boss and the top surface 111 of the upper mold cavity are properly engaged, the upper mold 1 and lower mold 2 are guided and self-positioned through surface contact. The top surface 111 of the upper mold cavity is a circular surface, which ensures good engagement after multiple consecutive operations. In a specific embodiment of this utility model, at least two upper mold bosses 13 are asymmetrically arranged on the upper mold cavity surface 14, and at least two lower mold positioning bosses 21 are asymmetrically arranged on the lower mold cavity surface 23, which can eliminate the degree of freedom in mold assembly and achieve precise centering.

[0040] Example 2

[0041] The difference from Embodiment 1 is that, in this specific embodiment of the present invention, three upper mold bosses 13 and three lower mold positioning bosses 21 are respectively provided. Providing three upper mold bosses 13 and three lower mold positioning bosses 21 can form a stable triangular support structure, which, compared to two linear positioning bosses or four or more, can effectively prevent radial displacement of the mold.

[0042] In specific embodiments of this utility model, such as Figure 6 As shown, two of the three upper mold bosses 13 are symmetrically arranged, while the third is asymmetrically arranged with the symmetrical two. Similarly, two of the three lower mold positioning bosses 21 are symmetrically arranged, while the third is asymmetrically arranged with the symmetrical two. This eliminates the degree of freedom in mold assembly, achieving precise alignment, and improves the stability of the fit between the upper mold bosses 13 and the lower mold positioning bosses 21. In a specific embodiment of this invention, with the mold center as the origin and the horizontal direction to the right as the 0° reference, the positions of the three upper mold bosses 13 in the horizontal plane are 70°, 110°, and 270° clockwise, respectively.

[0043] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this utility model is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0044] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A windowless wheel hub mold with a guiding self-positioning mechanism, comprising an upper mold (1) and a lower mold (2) facing each other, wherein an upper mold cavity surface (14) and a lower mold cavity surface (23) are respectively formed on opposite sides of the upper mold (1) and the lower mold (2), characterized in that, The upper model cavity surface (14) and the lower model cavity surface (23) are equipped with a self-positioning guide mechanism for guiding and supporting the upper mold (1) and the lower mold (2) and for centering and correcting deviation.

2. A windowless wheel hub mold with a guiding self-positioning mechanism according to claim 1, characterized in that, The guiding self-positioning mechanism includes at least two upper mold bosses (13) and lower mold positioning bosses (21) that are vertically opposite to them. The upper mold bosses (13) are provided with upper mold positioning cavities (11). The upper mold bosses (13) are located on the upper mold cavity surface (14), and the lower mold positioning bosses (21) are located on the lower mold cavity surface (23).

3. A windowless wheel hub mold with a guiding self-positioning mechanism according to claim 2, characterized in that, At least two upper mold bosses (13) are asymmetrically arranged on the upper mold cavity surface (14), and at least two lower mold positioning bosses (21) are asymmetrically arranged on the lower mold cavity surface (23).

4. A windowless wheel hub mold with a guiding self-positioning mechanism according to claim 2 or 3, characterized in that, The lower mold positioning boss (21) is provided with a lower mold positioning boss guide surface (211) and a lower mold positioning boss positioning surface (212). The lower mold positioning boss guide surface (211) is located on the outer ring of the lower mold positioning boss (21), and the lower mold positioning boss positioning surface (212) is located on the top of the lower mold positioning boss (21). The upper mold boss (13) is provided with an upper mold cavity top surface (111) and an upper mold cavity cone surface (112). The upper mold cavity top surface (111) is located inside the upper mold positioning cavity (11), and the upper mold cavity cone surface (112) is located on the side of the upper mold positioning cavity (11). The upper mold cavity cone surface (112) cooperates with the lower mold positioning boss guide surface (211) to realize the center guidance of the upper and lower molds. The lower mold positioning boss positioning surface (212) cooperates with the upper mold cavity top surface (111) to realize surface contact and complete the center self-guiding positioning of the upper and lower molds.

5. A windowless wheel hub mold with a guiding self-positioning mechanism according to claim 2 or 3, characterized in that, At least two upper mold bosses (13) are integrally formed on the upper mold cavity surface (14), and at least two lower mold positioning bosses (21) are integrally formed on the lower mold cavity surface (23).

6. A windowless wheel hub mold with a guiding self-positioning mechanism according to claim 4, characterized in that, The guide surface (211) of the lower mold positioning boss is an arc surface, and the positioning surface (212) of the lower mold positioning boss is a spherical surface.

7. A windowless wheel hub mold with a guiding self-positioning mechanism according to claim 4, characterized in that, The spherical angle formed between the upper and lower ends of the positioning surface (212) of the lower mold positioning boss in the vertical plane is set to be greater than 90° and less than 135°, and the center angle of the positioning surface (212) of the lower mold positioning boss is set to be greater than the center angle of the top surface (111) of the upper mold cavity.

8. A windowless wheel hub mold with a guiding self-positioning mechanism according to claim 7, characterized in that, The angle range within the vertical plane formed by the contact surface of the lower mold positioning boss (212) and the top surface of the upper mold cavity (111) is set between 75° and 80°. This angle range can ensure that when the mold undergoes slight deformation at high temperature, the two contact surfaces still maintain ≥80% of the effective contact area.

9. A windowless wheel hub mold with a guiding self-positioning mechanism according to claim 2, characterized in that, The upper mold boss (13) and the lower mold positioning boss (21) are each provided with three.

10. A windowless wheel hub mold with a guiding self-positioning mechanism according to claim 9, characterized in that, Two of the three upper mold bosses (13) are symmetrically arranged, and the other one is asymmetrically arranged with the two symmetrical bosses; two of the three lower mold positioning bosses (21) are symmetrically arranged, and the other one is asymmetrically arranged with the two symmetrical bosses.

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