Clutch hub body forming method, mold and clutch hub body

Abstract

A clutch hub body forming method, comprising: obtaining an aluminum alloy melt; providing a squeeze casting mold for a clutch hub body, and filling a charging barrel (11) of the squeeze casting mold with the aluminum alloy melt; after mold filling with the aluminum alloy melt is finished, applying a pressure and maintaining same, so as to form a solidified aluminum alloy casting; performing incomplete solid solution treatment on the solidified aluminum alloy casting; carrying out aging treatment on the aluminum alloy casting that has undergone the incomplete solid solution treatment; and finishing the outer surface and inner mating surface of the aluminum alloy casting that has undergone the aging treatment, so as to obtain a clutch hub body finished product. Further provided are a clutch hub body obtained by the described forming method, and a squeeze casting mold used for the described forming method for a clutch hub body. Aluminum alloy castings obtained by means of squeeze casting have high quality, and involve reduced energy consumption and shortened production periods, thus improving production efficiency and reducing costs; and the aluminum alloy castings have reduced thermal stress, thus reducing the risk of deformation or cracks.

Description

Clutch hub forming method, mold and clutch hub

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on and claims priority to the Chinese patent application with application number 202311151042.0 and application date September 7, 2023. The disclosed content of the Chinese patent application is hereby introduced as a whole into this application. Technical Field

[0003] The present disclosure relates to the field of clutch processing, and in particular to a clutch hub forming method, a mold, and a clutch hub. Background Art

[0004] The clutch is a common component in mechanical transmissions, consisting of a clutch hub, friction plates, steel plates, shaft, and bearings. During clutch operation, torque transmission is connected and disconnected by tightening and loosening the friction plates against the clutch hub. As a key component in torque transmission, the precision and strength of the clutch hub directly impact the performance and lifespan of the transmission.

[0005] The clutch hub typically consists of a splined area with a circumferential tooth profile for mating with the friction plate, and an annular hub base. The quality of the splined area's circumferential tooth profile directly impacts the assembly accuracy of the clutch hub and friction plate. The hub base connects to the shaft, transmitting torque, and mates with the piston, ensuring hydraulic pressure engages the steel plate and friction plate.

[0006] In related technologies, in order to meet the mechanical performance requirements of the clutch hub, the clutch hub is usually formed by two forming methods: one-piece stamping and upper and lower separate processing and welding.

[0007] Summary of the Invention

[0008] The inventors discovered that the prior art integrated stamping method involves plastic deformation. During the stamping process, the material flows under stress, resulting in varying thinning rates. This uneven thickness results in tooth tip roundness that doesn't meet dimensional requirements, leading to poor circumferential tooth profile quality and, in turn, insufficient assembly precision between the clutch hub and friction plate. Furthermore, the method of machining the upper and lower parts separately and then welding them together presents complex processing steps, high manufacturing costs, and difficulty ensuring hub coaxiality after welding.

[0009] In view of this, the embodiments of the present disclosure provide a clutch hub forming method, a mold, and a clutch hub, which can improve the processing quality of the clutch hub while meeting the mechanical performance requirements of the clutch hub.

[0010] In one aspect of the present disclosure, a clutch hub forming method is provided, comprising:

[0011] obtaining an aluminum alloy melt;

[0012] Providing an extrusion casting die for the clutch hub body, and filling the aluminum alloy melt into the barrel of the extrusion casting die;

[0013] After the aluminum alloy melt is filled into the mold, pressurizing and maintaining the mold to form a solidified aluminum alloy casting;

[0014] performing an incomplete solid solution treatment on the solidified aluminum alloy casting;

[0015] Perform aging treatment on aluminum alloy castings that have undergone incomplete solution treatment;

[0016] The outer surface and inner assembly surface of the aluminum alloy casting that has completed the aging treatment are fine-machined to obtain a finished clutch hub body.

[0017] In some embodiments, the step of pressurizing and maintaining comprises:

[0018] Apply pressure at an extrusion pressure of 200-300 MPa and maintain for 30-40 seconds.

[0019] In some embodiments, the extrusion casting mold includes a movable mold assembly, a fixed mold assembly, a cylinder seat, a first mechanical locking mechanism and a second mechanical locking mechanism. The barrel is arranged on the cylinder seat, the fixed mold assembly is located on the upper side of the cylinder seat, and can be locked with the cylinder seat by the first mechanical locking mechanism. The movable mold assembly is located on the upper side of the fixed mold assembly and can move relative to the fixed mold assembly to form a cavity communicating with the barrel, and can be locked with the fixed mold assembly by the second mechanical locking mechanism.

[0020] The steps of providing an extrusion casting mold for the clutch hub body and filling the aluminum alloy melt into the barrel of the extrusion casting mold include:

[0021] preheating the squeeze casting mold;

[0022] The movable mold assembly moves upward relative to the fixed mold assembly, and a mold release agent is sprayed on the portions of the movable mold assembly and the fixed mold assembly respectively used to form the mold cavity;

[0023] The movable mold assembly moves downward relative to the fixed mold assembly and closes the mold with the fixed mold assembly, and then the movable mold assembly and the fixed mold assembly are locked by the second mechanical locking mechanism;

[0024] The movable mold assembly and the fixed mold assembly of the mold are moved upward relative to the cylinder base, and a portion of the aluminum alloy melt is filled into the barrel;

[0025] The movable mold assembly and the fixed mold assembly are moved downward relative to the cylinder base to close the mold with the cylinder base, and then the fixed mold assembly is locked with the cylinder base by the first mechanical locking mechanism;

[0026] A portion of the aluminum alloy melt is filled into the mold cavity through the barrel at a speed of 0.1 to 0.4 m / s.

[0027] In some embodiments, the step of preheating the squeeze casting mold comprises:

[0028] The extrusion casting mold is preheated to maintain the temperature of the extrusion casting mold at 160-220°C.

[0029] In some embodiments, the step of performing incomplete solution treatment on the aluminum alloy casting comprises:

[0030] The solidified aluminum alloy casting is taken out from the squeeze casting mold and placed in water at 60-100° C. for cooling.

[0031] In some embodiments, the step of performing aging treatment on the aluminum alloy casting that has undergone incomplete solution treatment includes:

[0032] The aluminum alloy castings that have completed non-solution treatment are kept in a heat treatment furnace at 170-200°C for 5-8 hours, and then taken out of the furnace and air-cooled.

[0033] In some embodiments, the aluminum alloy melt has a composition by mass percentage wt% as follows: Si: 7-9, Cu: 2-4, Mg: 0.4-0.8, Mn: 0.3-0.6, Fe: 0.1-0.4, Ni: 0.4-0.6, Sr: 0.1-0.3, and the rest is Al and unavoidable impurities, and the total impurities are ≤0.4.

[0034] In some embodiments, the step of obtaining an aluminum alloy melt comprises:

[0035] According to the composition of the aluminum alloy melt in terms of mass percentage (wt%), weighing a metal aluminum ingot, an aluminum-silicon alloy, an aluminum-copper alloy, an aluminum-manganese alloy, an aluminum-nickel alloy, a metal magnesium ingot wrapped by an aluminum-copper alloy, and an aluminum-strontium alloy;

[0036] Symmetrically taken metal aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys, aluminum-nickel alloys, metal magnesium ingots wrapped by aluminum-copper alloys, and aluminum-strontium alloys are melted in a melting furnace to obtain the aluminum alloy melt.

[0037] In some embodiments, before the step of melting the weighed metal aluminum ingot, aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy, or aluminum-nickel alloy, the method further comprises:

[0038] The weighed metal aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys and aluminum-nickel alloys are placed in a drying furnace and preheated at a preheating temperature of 150-250°C.

[0039] In some embodiments, the step of smelting the aluminum ingot, aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy, aluminum-nickel alloy, magnesium ingot wrapped by aluminum-copper alloy, and aluminum-strontium alloy taken symmetrically in a smelting furnace comprises:

[0040] Adding the preheated aluminum ingot into a smelting furnace and heating it to 700-760° C. to melt the aluminum ingot into aluminum liquid;

[0041] adding the weighed aluminum-silicon alloy, the aluminum-copper alloy, the aluminum-manganese alloy, and the aluminum-nickel alloy into the metallic aluminum liquid in order of melting point from low to high, so as to melt the aluminum-silicon alloy, the aluminum-copper alloy, the aluminum-manganese alloy, and the aluminum-nickel alloy;

[0042] Adding a weighed magnesium ingot wrapped with aluminum-copper alloy and performing electromagnetic stirring;

[0043] A rotary degassing method is used to introduce nitrogen or inert gas into the bottom of the smelting furnace for degassing;

[0044] Add weighed aluminum strontium alloy to perform modification treatment;

[0045] A slag removal agent is added into the smelting furnace to perform slag removal treatment.

[0046] In some embodiments, the clutch hub includes a hub base and a cylindrical structure integrally formed with the hub base, the cylindrical structure having an internal spline, and the internal spline includes a plurality of key teeth arranged along the circumferential direction;

[0047] The steps of finishing the outer surface and inner assembly surface of the aluminum alloy casting after aging treatment include:

[0048] Finishing the axial end surfaces of the portion of the aluminum alloy casting corresponding to the hub base, which has undergone aging treatment, and the outer peripheral surface and axial end surface of the portion corresponding to the cylindrical structure;

[0049] Annular grooves for arranging friction plates are machined on the aluminum alloy casting that has completed the aging treatment, corresponding to the plurality of key teeth.

[0050] In one aspect of the present disclosure, a clutch hub body is provided, which is obtained by the aforementioned clutch hub body forming method.

[0051] In some embodiments, the clutch hub has a hardness of ≥150 HBW, a yield strength of ≥320 MPa, a tensile strength of ≥400 MPa, and an elongation after fracture of ≥4%.

[0052] In some embodiments, the clutch hub body includes a hub body base and a cylindrical structure integrally formed with the hub body base, the cylindrical structure has an internal spline, and the internal spline includes a plurality of key teeth arranged along the circumferential direction; the tooth surface roughness of the plurality of key teeth Ra≤1.6μm, and the tooth profile accuracy is level 7-8.

[0053] In one aspect of the present disclosure, an extrusion casting mold is provided for use in the aforementioned clutch hub body forming method, comprising:

[0054] The cylinder seat is provided with a cylinder;

[0055] a fixed die assembly, located on the upper side of the cylinder seat, and having a recess, the bottom of which can be in communication with the barrel when the fixed die assembly and the cylinder seat are in mold engagement;

[0056] a movable mold assembly, located on the upper side of the fixed mold assembly, and having a convex portion, wherein the convex portion can be inserted into the concave portion when the movable mold assembly and the fixed mold assembly are closed, so as to form a cavity with the concave portion;

[0057] A first mechanical locking mechanism is configured to lock the fixed mold assembly and the cylinder base when the fixed mold assembly and the cylinder base are in mold closing; and

[0058] The second mechanical locking mechanism is configured to lock the movable mold assembly and the fixed mold assembly when the movable mold assembly and the fixed mold assembly are clamped.

[0059] In some embodiments, the first mechanical locking mechanism comprises:

[0060] a first locking block provided on the outer wall of the cylinder seat;

[0061] A second locking block provided on the outer wall of the fixed mold assembly; and

[0062] A first U-shaped lock for locking the relative positions of the first locking block and the second locking block.

[0063] In some embodiments, the second mechanical locking mechanism comprises:

[0064] a third locking block provided on the outer wall of the fixed mold assembly;

[0065] A fourth locking block provided on the outer wall of the movable mold assembly; and

[0066] A second U-shaped lock for locking the relative positions of the third locking block and the fourth locking block.

[0067] In some embodiments, the clutch hub body includes a hub body base and a cylindrical structure integrally formed with the hub body base, the cylindrical structure having an internal spline, and the internal spline including a plurality of key teeth arranged along the circumferential direction; the inner wall of the recess has an axial draft angle of 0.3°, the area of ​​the convex portion corresponding to the tooth top of the plurality of key teeth has an axial draft angle of 0.5°, and the area of ​​the convex portion corresponding to the tooth side surface of the plurality of key teeth has an axial draft angle of 0.3°.

[0068] In some embodiments, the extrusion casting mold further comprises:

[0069] The ejector pin assembly is located on the upper side of the movable mold assembly and has a plurality of ejector pins that can pass through the movable mold assembly and be used for demoulding the solidified aluminum alloy casting.

[0070] Therefore, according to the embodiment disclosed in the present invention, the aluminum alloy melt filled into the clutch hub body is extrusion-casted using an extrusion casting mold of the clutch hub body, and then the obtained aluminum alloy casting is subjected to incomplete solid solution treatment and aging treatment, so as to obtain the finished clutch hub body by fine machining the outer surface and inner assembly surface of the aluminum alloy casting that has completed the aging treatment. The aluminum alloy casting obtained by extrusion casting has high molding quality and is very dense, which is conducive to molding processing, and can be used for heat treatment to improve performance, so as to meet the performance requirements of high-precision, high-strength and tough hub bodies. In addition, the incomplete solid solution treatment of the obtained aluminum alloy casting can effectively save energy consumption and production cycle, which is conducive to improving production efficiency and reducing costs. Compared with the higher thermal stress caused by high temperature during complete solid solution treatment, this embodiment can reduce the generation of thermal stress, thereby reducing the risk of deformation or cracks in the aluminum alloy casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0072] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0073] FIG1 is a schematic flow diagram of a clutch hub forming method according to some embodiments of the present disclosure;

[0074] FIG2 is a schematic cross-sectional view of an extrusion casting mold according to some embodiments of the present disclosure;

[0075] 3 is a schematic diagram of a process for melting an aluminum alloy melt in a clutch hub forming method according to some embodiments of the present disclosure;

[0076] 4 is a schematic flow diagram of an extrusion casting process in a clutch hub body forming method according to some embodiments of the present disclosure;

[0077] FIG5 is a schematic structural diagram of a clutch hub according to some embodiments of the present disclosure.

[0078] It should be understood that the size of each part shown in the drawings is not drawn according to the actual proportional relationship.In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0079] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure, its application, or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions, and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0080] The terms "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The terms "include" or "comprises" and similar terms mean that the elements before the term include the elements listed after the term, and do not exclude the possibility of also including other elements. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0081] In the present disclosure, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be not directly connected to the other device but with an intervening device.

[0082] All terms (including technical or scientific terms) used in this disclosure have the same meaning as those understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined herein.

[0083] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0084] Figure 1 is a schematic diagram of a process for forming a clutch hub according to some embodiments of the present disclosure. Figure 2 is a schematic cross-sectional diagram of an extrusion casting mold according to some embodiments of the present disclosure.

[0085] 1 and 2 , an embodiment of the present disclosure provides a clutch hub forming method, including steps S1 to S6 .

[0086] In step S1 , an aluminum alloy melt is obtained.

[0087] In step S2, an extrusion casting mold of the clutch hub body is provided, and the aluminum alloy melt is filled into the barrel 11 of the extrusion casting mold.

[0088] In step S3, after the aluminum alloy melt is filled into the mold, the mold is pressurized and maintained to form a solidified aluminum alloy casting;

[0089] In step S4, the solidified aluminum alloy casting is subjected to incomplete solution treatment;

[0090] In step S5, the aluminum alloy casting that has undergone incomplete solid solution treatment is subjected to aging treatment;

[0091] In step S6, the outer surface and inner assembly surface of the aluminum alloy casting that has completed the aging treatment are fine-machined to obtain a finished clutch hub body.

[0092] In this embodiment, the aluminum alloy melt filled into the clutch hub body is extrusion-casted using an extrusion casting mold, and then the obtained aluminum alloy casting is subjected to incomplete solid solution treatment and aging treatment, thereby obtaining the finished clutch hub body by fine-machining the outer surface and inner assembly surface of the aluminum alloy casting that has completed the aging treatment.

[0093] In related technologies, aluminum alloy workpieces can also be formed using die casting. However, die casting is typically used for thin-walled parts. While it offers high processing speed, it lacks density and is unsuitable for heat treatment. The aluminum alloy grades used also fail to meet the performance requirements of the clutch hub. In contrast, the squeeze casting method used in this embodiment produces aluminum alloy castings of higher quality and greater density, facilitating forming and processing. It can also be used for heat treatment to improve performance, thereby achieving the performance requirements of a high-precision, high-strength, and high-toughness hub.

[0094] Compared with the stamping one-piece molding method and the upper and lower split processing and welding molding in the related technology, considering the complex structure of the clutch hub and the large variation in wall thickness, the aluminum alloy casting obtained by extrusion casting adopted in this embodiment has higher molding quality, is convenient for subsequent fine processing, and can obtain higher processing quality.

[0095] In addition, the incomplete solution treatment of the obtained aluminum alloy casting can effectively save energy consumption and production cycle, which is beneficial to improving production efficiency and reducing costs. Compared with the higher thermal stress caused by high temperature during complete solution treatment, this embodiment can reduce the generation of thermal stress, thereby reducing the risk of deformation or cracking of the aluminum alloy casting.

[0096] In some embodiments, the aluminum alloy melt obtained in step S1 has a composition by mass wt% as follows:

[0097] Si: 7-9, optional: 7, 7.5, 8, 8.5 or 9;

[0098] Cu: 2-4, optional: 2, 2.5, 3, 3.5 or 4;

[0099] Mg: 0.4-0.8, optional: 0.4, 0.5, 0.6, 0.7 or 0.8;

[0100] Mn: 0.3~0.6, optional 0.3, 0.4, 0.5 or 0.6;

[0101] Fe: 0.1~0.4, optional: 0.1, 0.2, 0.3 or 0.4;

[0102] Ni: 0.4-0.6, optional: 0.4, 0.45, 0.5, 0.55 or 0.6;

[0103] Sr: 0.1~0.3, optional: 0.1, 0.15, 0.2, 0.25 or 0.3;

[0104] The rest is Al and unavoidable impurities, the total impurities are ≤0.4, and the total impurities can be selected to be equal to 0.4, 0.35, 0.3, 0.25, 0.2 or 0.1.

[0105] In this aluminum alloy melt, appropriate amounts of Si and Mn improve its fluidity, enabling good mold filling. Appropriate amounts of Mg, Ni, and Fe increase the strength of the aluminum alloy, enhancing the toughness of the clutch hub. An appropriate amount of Sr improves the morphology of eutectic silicon, increasing the toughness of the clutch hub. An appropriate amount of Cu improves the strength and heat treatment properties of the aluminum alloy, as well as its corrosion resistance. Combined with the aforementioned squeeze casting and heat treatment processes, a high-precision, high-strength, and high-toughness aluminum alloy clutch hub can be obtained.

[0106] According to the above-mentioned composition in mass percentage wt%, in some embodiments, the step of obtaining an aluminum alloy melt in step S1 includes: weighing metal aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys, aluminum-nickel alloys, metal magnesium ingots wrapped by aluminum-copper alloys, and aluminum-strontium alloys according to the composition of the aluminum alloy melt in mass percentage wt%; and smelting the symmetrically taken metal aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys, aluminum-nickel alloys, metal magnesium ingots wrapped by aluminum-copper alloys, and aluminum-strontium alloys in a smelting furnace to obtain the aluminum alloy melt.

[0107] The use of metal magnesium ingots wrapped by aluminum-copper alloy during the smelting process can reduce the oxidation of magnesium, thereby reducing oxide impurities in the aluminum alloy.

[0108] In some embodiments, before the step of melting the weighed metal aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys, and aluminum-nickel alloys, it also includes: placing the weighed metal aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys, and aluminum-nickel alloys into a drying furnace for preheating at a preheating temperature of 150-250°C.

[0109] Preheating metal aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys and aluminum-nickel alloys to 150-250°C (e.g., 150°C, 175°C, 200°C, 225°C or 250°C) helps to improve melting efficiency, improve temperature uniformity among various materials, and facilitate obtaining a more uniform aluminum alloy melt.

[0110] FIG3 is a schematic diagram of a process for melting an aluminum alloy melt in a clutch hub forming method according to some embodiments of the present disclosure.

[0111] 3 , in some embodiments, the step of smelting the symmetrically taken metal aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys, aluminum-nickel alloys, metal magnesium ingots wrapped by aluminum-copper alloys, and aluminum-strontium alloys in a smelting furnace includes steps S11 to S16.

[0112] In step S11, the preheated aluminum ingot is added to a smelting furnace and heated to 700-760°C (e.g., 700°C, 710°C, 720°C, 730°C, 740°C, 750°C or 760°C) to melt the aluminum ingot into aluminum liquid.

[0113] In step S12, the weighed aluminum-silicon alloy, the aluminum-copper alloy, the aluminum-manganese alloy and the aluminum-nickel alloy are added into the metallic aluminum liquid in order of melting point from low to high, so as to melt the aluminum-silicon alloy, the aluminum-copper alloy, the aluminum-manganese alloy and the aluminum-nickel alloy.

[0114] In step S13, a weighed magnesium ingot wrapped with an aluminum-copper alloy is added and electromagnetic stirring is performed.

[0115] In step S14, nitrogen or inert gas is introduced into the bottom of the smelting furnace for degassing by adopting a rotary degassing method.

[0116] In step S15, the weighed aluminum strontium alloy is added and subjected to a modification treatment.

[0117] In step S16, a slag removal agent is added into the smelting furnace to perform a slag removal process.

[0118] In the above step S15, the aluminum strontium alloy for the modification treatment is added after degassing, which not only realizes the modification treatment but also prevents the strontium element from being melted for a long time and lost when it is added earlier.

[0119] In the above embodiment, the step of pressurizing and maintaining in step S3 includes: pressurizing according to an extrusion pressure of 200-300 MPa (for example, 200 MPa, 220 MPa, 250 MPa, 280 MPa or 300 MPa) and maintaining it for 30-40 seconds (for example, 30 seconds, 35 seconds or 40 seconds).

[0120] By using a greater extrusion pressure during pressurization and maintenance, the casting can be solidified under high pressure to reduce the possibility of shrinkage cavity occurrence, effectively improve the density of the aluminum alloy hub body, and meet the density requirements of the clutch hub body in load-bearing.

[0121] FIG4 is a flow diagram of an extrusion casting process in a clutch hub forming method according to some embodiments of the present disclosure.

[0122] Referring to the extrusion casting mold shown in Figure 2, the extrusion casting mold includes a movable mold assembly 30, a fixed mold assembly 20, a cylinder base 10, a first mechanical locking mechanism 40, and a second mechanical locking mechanism 50. The barrel 11 is mounted on the cylinder base 10, and the fixed mold assembly 20 is located above the cylinder base 10 and can be locked to the cylinder base 10 via the first mechanical locking mechanism 40. The movable mold assembly 30 is located above the fixed mold assembly 20 and can move relative to the fixed mold assembly 20 to form a cavity communicating with the barrel 11. It can also be locked to the fixed mold assembly 20 via the second mechanical locking mechanism 50.

[0123] Accordingly, referring to FIG. 4 , in some embodiments, the step of providing the extrusion casting mold of the clutch hub body in step S2 and filling the aluminum alloy melt into the barrel 11 of the extrusion casting mold includes steps S21 to S26 .

[0124] In step S21, the extrusion casting mold is preheated. Extrusion casting can be performed on a dedicated vertical hydraulic press. The extrusion casting mold is pre-installed on the hydraulic press and preheated to maintain a temperature of 160-220°C (e.g., 160°C, 180°C, 200°C, or 220°C).

[0125] In step S22, the movable mold assembly 30 is moved upward relative to the fixed mold assembly 20, and a mold release agent is sprayed onto the portions of the movable mold assembly 30 and the fixed mold assembly 20 that form the mold cavity. If the movable mold assembly 30 and the fixed mold assembly 20 have been previously locked by the second mechanical locking mechanism 50, the second mechanical locking mechanism 50 can be opened, and the movable mold assembly 30 can be moved upward relative to the fixed mold assembly 20. A suitable amount of mold release agent can then be sprayed onto the mold cavity using a dedicated spray gun.

[0126] In step S23 , the movable mold assembly 30 is moved downward relative to the fixed mold assembly 20 and is clamped with the fixed mold assembly 20 , and then the movable mold assembly 30 and the fixed mold assembly 20 are locked by the second mechanical locking mechanism 50 .

[0127] In step S24 , the movable mold assembly 30 and the fixed mold assembly 20 are moved upward relative to the cylinder base 10 , and a portion of the aluminum alloy melt is filled into the barrel 11 .

[0128] In step S25, the movable mold assembly 30 and the fixed mold assembly 20 are moved downward relative to the cylinder base 10 and are molded with the cylinder base 10, and then the fixed mold assembly 20 is locked with the cylinder base 10 by the first mechanical locking mechanism 40.

[0129] In step S26, a portion of the aluminum alloy melt is filled into the mold cavity at a speed of 0.1 to 0.4 m / s through the barrel 11. Specifically, the aluminum alloy melt can be pushed by a piston to smoothly fill the mold. After the filling is completed, the pressure holding process is immediately started to solidify the aluminum alloy solution under high pressure.

[0130] In this embodiment, in order to adopt a larger extrusion pressure of 200-300 MPa when the pressurization is maintained, steps S23 and S25 respectively use the first mechanical locking mechanism and the second mechanical locking mechanism to lock when the mold is closed, so as to prevent the aluminum alloy melt from being squeezed out of the gap when subjected to a larger extrusion pressure.

[0131] In some embodiments, step S4 of performing incomplete solution treatment on the aluminum alloy casting includes: removing the solidified aluminum alloy casting from the extrusion casting mold and placing it in water at 60-100° C. for cooling.

[0132] Directly cooling the solidified aluminum alloy casting in water utilizes the residual heat of the casting, eliminating the traditional air cooling and reheating steps, thereby saving energy. This omission effectively shortens the manufacturing cycle and improves production efficiency. Furthermore, it reduces the use of heating equipment and energy, helping to reduce costs.

[0133] In some embodiments, step S5 of performing aging treatment on the aluminum alloy casting that has completed incomplete solution treatment includes: keeping the aluminum alloy casting that has completed non-solution treatment in a heat treatment furnace at 170-200°C (for example, 170°C, 180°C, 190°C or 200°C) for 5-8 hours (5h, 6h, 7h or 8h), and then taking it out of the furnace and air-cooling it.

[0134] By subjecting aluminum alloy castings that have completed incomplete solution treatment to an aging treatment at 170-200°C for 5-8 hours, the internal stress of the aluminum alloy castings can be effectively eliminated, the structure and size can be stabilized, and the mechanical properties can be improved.

[0135] FIG5 is a schematic structural diagram of a clutch hub according to some embodiments of the present disclosure.

[0136] Referring to FIG5 , in some embodiments, the clutch hub includes a hub base HS and a cylindrical structure HT integrally formed with the hub base HS, wherein the cylindrical structure HT has an internal spline IS, and the internal spline IS includes a plurality of key teeth arranged along the circumferential direction. Accordingly, step S6 of fine-machining the outer surface and inner assembly surface of the aluminum alloy casting that has undergone aging treatment includes: fine-machining both axial end faces of the portion of the aluminum alloy casting that has undergone aging treatment corresponding to the hub base HS, as well as the outer peripheral surface and axial end face of the portion corresponding to the cylindrical structure HT; and machining an annular groove RG for arranging the friction plate on the aluminum alloy casting that has undergone aging treatment corresponding to the plurality of key teeth.

[0137] The clutch hub body obtained by the clutch hub body forming method of the above embodiment can obtain good mechanical properties: the clutch hub body hardness is ≥150HBW, the yield strength is ≥320MPa, the tensile strength is ≥400MPa, and the elongation after fracture is ≥4%.

[0138] The clutch hub shown in Figure 5 includes a hub base HS and a cylindrical structure HT integrally formed with the hub base HS. The cylindrical structure HT has an internal spline IS, which includes multiple circumferentially arranged key teeth. The key teeth have a surface roughness Ra ≤ 1.6 μm and a profile accuracy of Grade 7-8. The tooth profile of the key teeth meets the roughness and profile accuracy requirements without requiring fine finishing.

[0139] The clutch hub molding process and the performance of the resulting clutch hub will be described below through a number of embodiments.

[0140] Example 1

[0141] In this embodiment, the aluminum alloy melt has the following composition by mass percentage (wt%): Si 8%, Cu 3%, Mg 0.6%, Mn 0.5%, Fe 0.3%, Ni 0.5%, Sr 0.2%, and the remainder is Al and unavoidable impurities, with the total amount of impurity elements being ≤0.4%.

[0142] 1. Preheat a certain amount of metal aluminum ingots (i.e. pure aluminum ingots), aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy and aluminum-nickel alloy in a drying furnace at a preheating temperature of 150°C.

[0143] 2. Add the aluminum ingot to the melting furnace and heat to 700°C to melt it. Add the aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy, and aluminum-nickel alloy until the raw materials are melted. Add the magnesium ingot wrapped in the aluminum-copper alloy sheath by pressure-feeding and electromagnetically stir for 10 minutes.

[0144] 3. Using the rotary degassing method, introduce nitriding or inert gas into the bottom of the smelting furnace for 10 minutes. Add aluminum-strontium alloy for modification. Add a slag remover to the smelting furnace for slag removal.

[0145] 4. A fixed amount of refined aluminum alloy melt is poured into the barrel for extrusion casting. The hydraulic press has a clamping force of 450 tons, a mold temperature of 160°C, and a ram moving at a speed of 0.1 m / s, pushing the aluminum alloy melt through the runner and into the mold cavity. After filling is complete, high pressure of 200 MPa is applied and maintained for 30 seconds to solidify the casting under high pressure to prevent shrinkage cavities. After the holding pressure is completed, the mold is opened, the casting is removed, and quickly cooled in water at 60-100°C.

[0146] 5. Place the hub casting in a 170℃ heat treatment furnace, keep it warm for 5 hours, and then take it out of the furnace and air cool it.

[0147] 6. According to the technical requirements of the drawings, the upper and lower end faces, outer surface and assembly surface of the hub body are fine-machined to obtain the final product.

[0148] The clutch hub prepared by the above method was subjected to non-destructive testing, hardness, tensile testing, surface roughness and tooth profile accuracy testing. It was found that there were no defects such as pores, looseness, shrinkage holes, etc. inside. The hardness was 150HBW, the yield strength was 335MPa, the tensile strength was 415MPa, the elongation after fracture was 6%, the tooth surface roughness Ra was 1.4μm, and the tooth profile accuracy was level 7.

[0149] Example 2

[0150] In this embodiment, the aluminum alloy melt has a composition of Si 8%, Cu 3%, Mg 0.6%, Mn 0.5%, Fe 0.3%, Ni 0.5%, Sr 0.2% by mass percentage (wt%), with the remainder being Al and unavoidable impurities, and the total amount of impurity elements is ≤0.4%.

[0151] The preparation method of the aluminum alloy clutch hub in this embodiment includes the following steps:

[0152] 1. Preheat a certain amount of metal aluminum ingots, aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy, and aluminum-nickel alloy in a drying furnace at a preheating temperature of 200°C.

[0153] 2. Add the aluminum ingot to the melting furnace and heat to 730°C to melt it. Add the aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy, and aluminum-nickel alloy until the raw materials are melted. Add the magnesium ingot wrapped in the aluminum-copper alloy sheath by pressure-feeding and electromagnetically stir for 10 minutes.

[0154] 3. Using the rotary degassing method, introduce nitriding or inert gas into the bottom of the smelting furnace for 10 minutes. Add aluminum-strontium alloy for modification. Add a slag remover to the smelting furnace for slag removal.

[0155] 4. A fixed amount of refined aluminum alloy melt is poured into the barrel for extrusion casting. The hydraulic press clamps the mold with a force of 450 tons and a mold temperature of 180°C. The ram moves at a speed of 0.2 m / s, pushing the aluminum alloy solution through the runner and into the mold cavity. After filling is complete, high pressure of 250 MPa is applied and maintained for 35 seconds to solidify the casting under high pressure to prevent shrinkage cavities. After the pressure is maintained, the mold is opened, the casting is removed, and quickly cooled in water at 60-100°C.

[0156] 5. Place the hub casting in a 180℃ heat treatment furnace, keep it warm for 6 hours, and then take it out of the furnace and air cool it.

[0157] 6. According to the technical requirements of the drawings, the upper and lower end faces, outer surface and assembly surface of the hub body are fine-machined to obtain the final product.

[0158] The clutch hub prepared by the above method was subjected to hardness, tensile test, surface roughness and tooth profile accuracy tests. Its hardness was 156HBW, yield strength was 368MPa, tensile strength was 435MPa, elongation after fracture was 5.5%, tooth surface roughness Ra was 1.2μm, and tooth profile accuracy was level 8.

[0159] Example 3

[0160] In this embodiment, the aluminum alloy melt has the following composition by mass percentage (wt%): Si 9%, Cu 4%, Mg 0.8%, Mn 0.6%, Fe 0.4%, Ni 0.6%, Sr 0.3%, and the remainder is Al and unavoidable impurities, with the total amount of impurity elements being ≤0.4%.

[0161] The preparation method of the aluminum alloy clutch hub in this embodiment includes the following steps:

[0162] 1. Preheat a certain amount of metal aluminum ingots, aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy, and aluminum-nickel alloy in a drying furnace at a preheating temperature of 250°C.

[0163] 2. Add the aluminum ingot to the melting furnace and heat to 760°C to melt it. Add the aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy, and aluminum-nickel alloy until the raw materials are melted. Add the magnesium ingot wrapped in the aluminum-copper alloy sheath by pressure-feeding and electromagnetically stir for 10 minutes.

[0164] 3. Using the rotary degassing method, introduce nitriding or inert gas into the bottom of the smelting furnace for 20 minutes. Add aluminum-strontium alloy for modification. Add a slag remover to the smelting furnace for slag removal.

[0165] 4. A fixed amount of refined aluminum alloy melt is poured into the barrel for extrusion casting. The hydraulic press clamps the mold with a force of 450 tons and a mold temperature of 200°C. The ram moves at a speed of 0.4 m / s, pushing the aluminum alloy solution through the runner and into the mold cavity. After filling is complete, high pressure is applied at 300 MPa and maintained for 40 seconds to solidify the casting under high pressure to prevent shrinkage cavities. After the pressure is maintained, the mold is opened, the casting is removed, and quickly cooled in water at 60-100°C.

[0166] 5. Place the hub casting in a 200℃ heat treatment furnace, keep it warm for 8 hours, and then take it out of the furnace and air cool it.

[0167] 6. According to the technical requirements of the drawings, the upper and lower end faces, outer surface and assembly surface of the hub body are fine-machined to obtain the final product.

[0168] The clutch hub prepared by the above method was subjected to hardness, tensile test, surface roughness and tooth profile accuracy tests. Its hardness was 165HBW, yield strength was 382MPa, tensile strength was 451MPa, elongation after fracture was 4.5%, tooth surface roughness Ra was 1.0μm, and tooth profile accuracy was level 8.

[0169] With reference to FIG2 , an embodiment of the present disclosure provides an extrusion casting mold for use in the clutch hub forming method of any of the aforementioned embodiments. The extrusion casting mold includes: a cylinder base 10, a fixed mold assembly 20, a movable mold assembly 30, a first mechanical locking mechanism 40, and a second mechanical locking mechanism 50. The cylinder base 10 is provided with a barrel 11. The fixed mold assembly 20 is located on the upper side of the cylinder base 10 and has a recess 23, the bottom of which can be connected to the barrel 11 when the fixed mold assembly 20 and the cylinder base 10 are closed.

[0170] The movable mold assembly 30 is located above the fixed mold assembly 20 and has a protrusion 33. The protrusion 33 is capable of being inserted into the recess 23 when the movable mold assembly 30 and the fixed mold assembly 20 are closed, thereby forming a cavity with the recess 23. A first mechanical locking mechanism 40 is configured to lock the fixed mold assembly 20 and the cylinder base 10 when the fixed mold assembly 20 and the cylinder base 10 are closed. A second mechanical locking mechanism 50 is configured to lock the movable mold assembly 30 and the fixed mold assembly 20 when the movable mold assembly 30 and the fixed mold assembly 20 are closed.

[0171] The first and second mechanical locking mechanisms are used for locking during mold closing, which can provide additional clamping force outside the hydraulic press to prevent the aluminum alloy melt from being squeezed out of the gap when subjected to a large extrusion pressure of 200-300 MPa.

[0172] In Figure 2, the first mechanical locking mechanism 40 may include a first locking block 41, a second locking block 42, and a first U-shaped lock 43. The first locking block 41 is disposed on the outer wall of the cylinder base 10, the second locking block 42 is disposed on the outer wall of the fixed mold assembly 20, and the first U-shaped lock 43 is used to lock the relative positions of the first locking block 41 and the second locking block 42.

[0173] The second mechanical locking mechanism 50 may include a third locking block 51, a fourth locking block 52, and a second U-shaped lock 53. The third locking block 51 is disposed on the outer wall of the fixed mold assembly 20, the fourth locking block 52 is disposed on the outer wall of the movable mold assembly 30, and the second U-shaped lock 53 is used to lock the relative positions of the third locking block 51 and the fourth locking block 52.

[0174] As mentioned above, in some embodiments, the clutch hub body includes a hub body base HS and a cylindrical structure HT integrally formed with the hub body base HS, the cylindrical structure HT having an internal spline IS, and the internal spline IS including a plurality of key teeth arranged along the circumferential direction. Accordingly, in the extrusion casting mold, the inner wall of the recess 23 has an axial draft angle of 0.3°, the area of ​​the protrusion 33 corresponding to the tooth top of the plurality of key teeth has an axial draft angle of 0.5°, and the area of ​​the protrusion 33 corresponding to the tooth side surface of the plurality of key teeth has an axial draft angle of 0.3°. These draft angles can ensure that the aluminum alloy casting of the clutch hub body is smoothly demolded and a high-precision tooth surface can be obtained.

[0175] In some embodiments, the squeeze casting mold further includes an ejector pin assembly 60. The ejector pin assembly 60 is located above the movable mold assembly 30 and includes a plurality of ejector pins 61 that can penetrate the movable mold assembly 30 and be used to demold the solidified aluminum alloy casting. The ejector pin assembly 60 can be used to push the solidified casting out of the mold cavity.

[0176] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0177] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A clutch hub body forming method, comprising: obtaining an aluminum alloy melt; Providing an extrusion casting mold for the clutch hub body, and filling the aluminum alloy melt into a barrel (11) of the extrusion casting mold; After the aluminum alloy melt is filled into the mold, the mold is pressurized and maintained to form a solidified aluminum alloy casting; performing an incomplete solution treatment on the solidified aluminum alloy casting; Aging treatment is performed on aluminum alloy castings that have undergone incomplete solution treatment; The outer surface and inner assembly surface of the aluminum alloy casting that has completed the aging treatment are finely machined to obtain a finished clutch hub body.

2. The clutch hub molding method according to claim 1, wherein: The steps of pressurization maintenance include: The pressurization is performed at an extrusion pressure of 200-300 MPa and maintained for 30-40 seconds.

3. The clutch hub molding method according to claim 2, wherein: The extrusion casting mold comprises a movable mold assembly (30), a fixed mold assembly (20), a cylinder seat (10), a first mechanical locking mechanism (40) and a second mechanical locking mechanism (50); the barrel (11) is arranged on the cylinder seat (10); the fixed mold assembly (20) is located on the upper side of the cylinder seat (10) and can be locked with the cylinder seat (10) through the first mechanical locking mechanism (40); the movable mold assembly (30) is located on the upper side of the fixed mold assembly (20) and can move relative to the fixed mold assembly (20) to form a cavity connected with the barrel (11), and can be locked with the fixed mold assembly (20) through the second mechanical locking mechanism (50); The steps of providing an extrusion casting mold for the clutch hub body and filling the aluminum alloy melt into a barrel (11) of the extrusion casting mold include: preheating the squeeze casting mold; The movable mold assembly (30) is moved upward relative to the fixed mold assembly (20), and a mold release agent is sprayed on the parts of the movable mold assembly (30) and the fixed mold assembly (20) respectively used to form the mold cavity; The movable mold assembly (30) is moved downward relative to the fixed mold assembly (20) and is molded together with the fixed mold assembly (20), and then the movable mold assembly (30) and the fixed mold assembly (20) are locked by the second mechanical locking mechanism (50); The movable mold assembly (30) and the fixed mold assembly (20) of the mold are moved upward relative to the cylinder seat (10), and part of the aluminum alloy melt is filled into the barrel (11); The movable mold assembly (30) and the fixed mold assembly (20) are moved downward relative to the cylinder seat (10) and are molded together with the cylinder seat (10), and then the fixed mold assembly (20) is locked with the cylinder seat (10) by the first mechanical locking mechanism (40); A portion of the aluminum alloy melt is filled into the mold cavity through the barrel (11) at a speed of 0.1 to 0.4 m / s.

4. The clutch hub molding method according to claim 3, wherein: The step of preheating the squeeze casting mold comprises: The extrusion casting mold is preheated to maintain the temperature of the extrusion casting mold at 160-220°C.

5. The clutch hub molding method according to claim 1, wherein: The step of performing incomplete solution treatment on the aluminum alloy casting comprises: The solidified aluminum alloy casting is taken out from the extrusion casting mold and placed in water at 60-100° C. for cooling.

6. The clutch hub molding method according to claim 5, wherein: The steps for aging treatment of aluminum alloy castings that have completed incomplete solid solution treatment include: The aluminum alloy castings that have completed the non-solid solution treatment are kept in a heat treatment furnace at 170-200°C for 5-8 hours and then taken out of the furnace and air-cooled.

7. The clutch hub molding method according to claim 1, wherein: The aluminum alloy melt has the following composition by mass percentage wt%: Si: 7-9, Cu: 2-4, Mg: 0.4-0.8, Mn: 0.3-0.6, Fe: 0.1-0.4, Ni: 0.4-0.6, Sr: 0.1-0.3, and the rest is Al and unavoidable impurities, and the total impurities are ≤0.

4.

8. The clutch hub molding method according to claim 7, wherein: The steps of obtaining the aluminum alloy melt include: According to the composition of the aluminum alloy melt in terms of mass percentage wt%, weighing metal aluminum ingots, aluminum-silicon alloys, aluminum-copper alloys, aluminum-manganese alloys, aluminum-nickel alloys, metal magnesium ingots wrapped by aluminum-copper alloys, and aluminum-strontium alloys; The metal aluminum ingots, aluminum silicon alloys, aluminum copper alloys, aluminum manganese alloys, aluminum nickel alloys, etc. taken symmetrically in the smelting furnace A metal magnesium ingot wrapped with an aluminum-copper alloy and an aluminum-strontium alloy are smelted to obtain the aluminum alloy melt.

9. The clutch hub molding method according to claim 8, wherein: Before the step of melting the weighed metal aluminum ingot, aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy, or aluminum-nickel alloy, the method further comprises: The weighed metal aluminum ingots, aluminum silicon alloys, aluminum copper alloys, aluminum manganese alloys and aluminum nickel alloys are placed in a drying furnace and preheated at a preheating temperature of 150-250°C.

10. The clutch hub molding method according to claim 8, wherein: The steps of smelting the aluminum ingot, aluminum-silicon alloy, aluminum-copper alloy, aluminum-manganese alloy, aluminum-nickel alloy, magnesium ingot wrapped by aluminum-copper alloy and aluminum-strontium alloy taken symmetrically in a smelting furnace include: Adding the preheated aluminum ingot into a smelting furnace and heating it to 700-760° C. to melt the aluminum ingot into aluminum liquid; Adding the weighed aluminum-silicon alloy, the aluminum-copper alloy, the aluminum-manganese alloy and the aluminum-nickel alloy into the aluminum liquid in the order of melting points from low to high, so as to melt the aluminum-silicon alloy, the aluminum-copper alloy, the aluminum-manganese alloy and the aluminum-nickel alloy; Adding a weighed magnesium ingot wrapped by an aluminum-copper alloy and performing electromagnetic stirring; A rotary degassing method is used to introduce nitrogen or inert gas into the bottom of the smelting furnace for degassing; Add weighed aluminum-strontium alloy to perform modification treatment; A slag removal agent is added into the smelting furnace to perform slag removal treatment.

11. The clutch hub molding method according to claim 1, wherein: The clutch hub comprises a hub base (HS) and a cylindrical structure (HT) integrally formed with the hub base (HS), wherein the cylindrical structure (HT) has an internal spline (IS), and the internal spline (IS) comprises a plurality of key teeth arranged in a circumferential direction; The steps of finishing the outer surface and inner assembly surface of the aluminum alloy casting after aging treatment include: Finishing the end faces of both sides of the axial direction of the portion of the aluminum alloy casting corresponding to the hub base (HS) after the aging treatment, and the outer peripheral surface and the axial end face of the portion corresponding to the cylindrical structure (HT); Annular grooves for arranging friction plates are machined on the aluminum alloy casting that has completed the aging treatment corresponding to the plurality of key teeth.

12. A clutch hub body obtained by the clutch hub body forming method according to any one of claims 1 to 11.

13. The clutch hub according to claim 12, wherein: The clutch hub has a hardness of ≥150 HBW, a yield strength of ≥320 MPa, a tensile strength of ≥400 MPa, and an elongation after fracture of ≥4%.

14. The clutch hub according to claim 12, wherein: The clutch hub body includes a hub base (HS) and a cylindrical structure (HT) integrally formed with the hub base (HS), the cylindrical structure (HT) having an internal spline (IS), the internal spline (IS) including a plurality of key teeth arranged along the circumferential direction; the tooth surface roughness of the plurality of key teeth is Ra≤1.6μm, and the tooth accuracy is level 7-8.

15. An extrusion casting mold for use in the clutch hub molding method according to any one of claims 1 to 11, comprising: A cylinder seat (10) is provided with a barrel (11); A fixed mold assembly (20) is located on the upper side of the cylinder seat (10) and has a recess (23), the bottom of which can be connected to the barrel (11) when the fixed mold assembly (20) and the cylinder seat (10) are molded together; A movable mold assembly (30) is located on the upper side of the fixed mold assembly (20) and has a convex portion (33). The convex portion (33) can be inserted into the concave portion (23) when the movable mold assembly (30) and the fixed mold assembly (20) are molded together to form a mold cavity with the concave portion (23); A first mechanical locking mechanism (40) is configured to lock the fixed mold assembly (20) and the cylinder seat (10) when the fixed mold assembly (20) and the cylinder seat (10) are in mold closing relationship; and The second mechanical locking mechanism (50) is configured to lock the movable mold assembly (30) and the fixed mold assembly (20) when the movable mold assembly (30) and the fixed mold assembly (20) are molded together.

16. The squeeze casting mold according to claim 15, wherein: The first mechanical locking mechanism (40) comprises: A first locking block (41) arranged on the outer wall of the cylinder seat (10); A second locking block (42) disposed on the outer wall of the fixed mold assembly (20); and A first U-shaped member for locking the relative positions of the first locking block (41) and the second locking block (42) Lock (43).

17. The squeeze casting mold according to claim 15, wherein: The second mechanical locking mechanism (50) comprises: A third locking block (51) arranged on the outer wall of the fixed mold assembly (20); A fourth locking block (52) disposed on the outer wall of the movable mold assembly (30); and A second U-shaped lock (53) is used to lock the relative positions of the third locking block (51) and the fourth locking block (52).

18. The squeeze casting mold according to claim 15, wherein: The clutch hub body comprises a hub body base (HS) and a cylindrical structure (HT) integrally formed with the hub body base (HS), wherein the cylindrical structure (HT) has an internal spline (IS), and the internal spline (IS) comprises a plurality of key teeth arranged along the circumferential direction; the inner wall of the recess (23) has an axial draft angle of 0.3°, the area of ​​the protrusion (33) corresponding to the tooth top of the plurality of key teeth has an axial draft angle of 0.5°, and the area of ​​the protrusion (33) corresponding to the tooth side surface of the plurality of key teeth has an axial draft angle of 0.3°.

19. The squeeze casting mold according to claim 15, further comprising: The ejector pin assembly (60) is located on the upper side of the movable mold assembly (30) and has a plurality of ejector pins (61) that can pass through the movable mold assembly (30) and be used for demolding a solidified aluminum alloy casting.

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