Extrusion casting device

Abstract

The squeeze casting device comprises a fixed die assembly and a movable die assembly which are oppositely arranged, a fixed die punch is arranged in the fixed die assembly, a movable die punch is arranged in the movable die assembly, a flow guide part is further arranged in a cavity of the fixed die assembly or the movable die assembly, a center pouring gate is formed in the middle of the flow guide part, and the center pouring gate is arranged in the cavity of the movable die assembly. And the central sprue is perpendicular to a parting surface between the fixed mold assembly and the movable mold assembly. The center sprue located in the middle of the cavity is obtained by arranging the flow guide part, the parting surface of the cavity is perpendicular to the center sprue, the process from the center sprue to the tail end of the cavity is short and relatively balanced, exhausting and mold filling are facilitated, meanwhile, the performance of a formed casting is relatively balanced, and the technological adaptability of extrusion casting is improved.

Description

Technical Field

[0001] The invention relates to mechanical equipment for parts molding, in particular to an extrusion casting device. Background Art

[0002] Squeeze casting, also known as liquid die forging, is a process method that applies high mechanical pressure to the liquid metal entering the mold cavity to make it shape and solidify, thereby obtaining a casting. The casting has a dense structure, can prevent pores and shrinkage, and its mechanical properties are close to those of forgings and higher than other ordinary castings.

[0003] According to the stress state and flow characteristics of liquid metal, it is divided into direct extrusion casting and indirect extrusion casting. In direct extrusion casting, liquid metal is filled into the cavity composed of a punch and a die under pressure, and the extrusion punch is directly squeezed on the casting. The main feature is that the metal has a slight plastic deformation during molding, and the comprehensive mechanical properties of the casting are relatively good; the main feature of indirect extrusion casting is that before pressurization, the liquid metal fills the pre-molded closed cavity. When pressurized, the pressurization punch transfers the pressure to the liquid metal in the cavity through the liquid metal in the runner. The punch does not directly but partially pressurizes the casting. In order to create good exhaust conditions, the extrusion punch's extrusion force on the liquid metal is mainly in the vertical direction from top to bottom or from bottom to top. The closing directions of the indirect extrusion mold are mainly two categories: vertical extrusion casting with horizontal parting and horizontal extrusion casting with vertical parting. The molding device mainly includes a fixed mold assembly, a movable mold assembly, an injection system, a hydraulic and control system, etc. The cylinder of the injection system pushes the injection punch to inject the metal liquid into the cavity and pressurize it. The movable mold assembly moves longitudinally (or horizontally) under the push of the working cylinder to form a cavity with the fixed mold assembly. In order to prevent the metal liquid from splashing during injection, the working cylinder applies a clamping force to lock the movable mold assembly and the mold parting surface.

[0004] The process adaptability of existing extrusion castings is relatively insufficient. The gate of the horizontally parted vertical extrusion casting machine is a combination type, and there is a turning gate between the gate and the cavity. The kinetic energy loss of the injection punch is large, which increases the pressure loss. The gate of the vertically parted horizontal indirect extrusion casting machine is a combination type. The gate is formed after the mold is closed. The cavity is arranged vertically between the movable mold and the fixed mold. The process distance between the gate and the end of the cavity is relatively large. The part of the casting far away from the gate is subject to a large pressure loss, resulting in uneven performance of the casting. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an extrusion casting device which is beneficial to the molding of castings, obtains relatively balanced mechanical properties, and improves the process adaptability of extrusion casting.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An extrusion casting device comprises a fixed die assembly and a movable die assembly arranged relatively to each other, wherein the fixed die assembly is provided with a fixed die punch, and the movable die assembly is provided with a movable die punch. A flow guide is also provided in the cavity of the fixed die assembly or the movable die assembly, and a central gate is provided in the middle of the flow guide, and the central gate is perpendicular to the parting surface between the fixed die assembly and the movable die assembly.

[0008] As a further improvement of the above technical solution: the central gate is a conical structure and the diameter of the end close to the material handle of the casting is larger.

[0009] As a further improvement of the above technical solution: the diameter of the central gate gradually increases from the middle to both ends.

[0010] As a further improvement of the above technical solution: a groove is provided in the middle of the central gate, and a clamping ring is provided in the groove.

[0011] As a further improvement of the above technical solution: a groove is provided in the middle of the central gate, and a filling material is provided in the groove.

[0012] As a further improvement of the above technical solution: the end surface of the guide member is provided with a vertical plug hole, and a vertical positioning pin is provided in the vertical plug hole.

[0013] As a further improvement of the above technical solution: a positioning portion is provided on the flow guide member, and a positioning pin is provided in the positioning portion.

[0014] As a further improvement of the above technical solution: the movable mold assembly and the fixed mold assembly are arranged opposite to each other up and down.

[0015] An extrusion casting device comprises a fixed die assembly and a movable die assembly arranged relatively to each other, wherein the fixed die assembly is provided with a fixed die punch, the movable die assembly is provided with a movable die punch, the fixed die punch is provided with a flow guide, and a center gate is formed between the flow guide and the movable die assembly; or the movable die punch is provided with a flow guide, and a center gate is formed between the flow guide and the fixed die assembly; the center gate is perpendicular to the parting surface between the fixed die assembly and the movable die assembly.

[0016] As a further improvement of the above technical solution:

[0017] The end surface of the flow guide is provided with an arc-shaped flange.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] The extrusion casting device disclosed in the present invention obtains a central gate located in the middle of the cavity by arranging a flow guide, the cavity parting surface is perpendicular to the central gate, and the process from the central gate to the end of the cavity is short and relatively balanced, which is conducive to exhaust and filling. At the same time, the performance of the casting obtained by molding is relatively balanced, thereby improving the process adaptability of extrusion casting.

[0020] Furthermore, during extrusion casting, the guide piece is integrated with the casting, and the center hole in the middle of the guide piece is a variable diameter structure, which is convenient for separation and reuse of the guide piece and the casting, improves process adaptability, and is also beneficial to reducing the casting cost of the casting.

[0021] Furthermore, a vertical insertion hole or a positioning portion is provided on the end face or the outer peripheral surface of the flow guide, which is beneficial to the positioning of the flow guide or the insert for forming the casting, and is beneficial to the forming of the casting and improving the forming quality of the insert and the cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1a It is a structural diagram of embodiment 1 of the present invention.

[0023] Figure 1b It is a structural schematic diagram of the use status of the first embodiment of the present invention.

[0024] Figure 1c It is a schematic structural diagram of a flywheel casting formed in Example 1 of the present invention.

[0025] Figure 1d It is a schematic structural diagram of the flow guide member in the first embodiment of the present invention.

[0026] Figure 2a It is a structural diagram of embodiment 2 of the present invention.

[0027] Figure 2b It is a structural schematic diagram of the use status of the second embodiment of the present invention.

[0028] Figure 2c It is a schematic structural diagram of a pipe sleeve casting formed in the second embodiment of the present invention.

[0029] Figure 2d It is a schematic structural diagram of the flow guide member in the second embodiment of the present invention.

[0030] Figure 3a It is a structural diagram of embodiment 3 of the present invention.

[0031] Figure 3b It is a structural schematic diagram of the use status of the third embodiment of the present invention.

[0032] Figure 3c It is a schematic structural diagram of a piston casting formed in Example 3 of the present invention.

[0033] Figure 3dIt is a schematic diagram of the structure of the flow guide member in the third embodiment of the present invention.

[0034] Figure 4a It is a structural diagram of embodiment 4 of the present invention.

[0035] Figure 4b It is a structural schematic diagram of the use status of the fourth embodiment of the present invention.

[0036] Figure 4c It is a schematic structural diagram of a brake disc casting formed according to a fourth embodiment of the present invention.

[0037] Figure 4d It is a schematic diagram of the structure of the flow guide member in the fourth embodiment of the present invention.

[0038] Figure 5a It is a structural diagram of embodiment 5 of the present invention.

[0039] Figure 5b It is a structural schematic diagram of the use status of the fifth embodiment of the present invention.

[0040] Figure 5c It is a schematic structural diagram of a sealing cover casting formed in Embodiment 5 of the present invention.

[0041] Figure 5d It is a schematic diagram of the structure of the flow guide member in the fifth embodiment of the present invention.

[0042] Figure 6a It is a structural diagram of embodiment 6 of the present invention.

[0043] Figure 6b It is a structural diagram of the use status of the sixth embodiment of the present invention.

[0044] Figure 6c It is a schematic structural diagram of an outer gear ring casting formed in Example 6 of the present invention.

[0045] Figure 6d It is a schematic diagram of the structure of the guide member in the sixth embodiment of the present invention.

[0046] The symbols in the figure represent:

[0047] 1. Fixed die assembly; 11. Fixed die punch; 2. Moving die assembly; 21. Moving die punch; 3. Guide piece; 31. Center gate; 32. Snap ring; 33. Filler; 34. Vertical plug hole; 35. Vertical positioning pin; 36. Positioning part; 37. Positioning pin; 38. Flange; 4. Casting; 41. Material handle; 5. Core; 6. Wear-resistant insert. DETAILED DESCRIPTION

[0048] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] In this application, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] Embodiment 1

[0053] Figure 1a to Figure 1d An embodiment of the extrusion casting device of the present invention is shown. The extrusion casting device of this embodiment includes a fixed mold assembly 1 and a movable mold assembly 2 arranged relatively. The fixed mold assembly 1 is provided with a fixed mold punch 11, and the movable mold assembly 2 is provided with a movable mold punch 21. A flow guide 3 is also provided in the mold cavity of the fixed mold assembly 1. A central gate 31 is provided in the middle of the flow guide 3. The central gate 31 is perpendicular to the parting surface between the fixed mold assembly 1 and the movable mold assembly 2. Preferably, the fixed mold assembly 1 is located below the movable mold assembly 2, that is, this embodiment adopts vertical extrusion. Of course, in other embodiments, the fixed mold assembly 1 and the movable mold assembly 2 can also adopt other arrangements, and the flow guide 3 can also be set in the mold cavity of the movable mold assembly 2. The extrusion casting process of the extrusion casting device is basically the same as the prior art and will not be repeated.

[0054] In the squeeze casting device of this embodiment, when forming a flywheel, the metal liquid has a short filling distance in the mold cavity, which is beneficial to the filling, slag removal, exhaust and sequential solidification of the mold cavity.

[0055] Furthermore, in this embodiment, the diameter of the central gate 31 gradually increases from the middle to both ends. The central gate 31 with such a variable diameter structure can form a boundary flange between the casting 4 and the material handle 41 of the casting 4, so as to facilitate the separation of the material handle 41 from the casting 4.

[0056] As a preferred embodiment, a groove is provided in the middle of the central gate 31, and a snap ring 32 is provided in the groove. By providing the snap ring 32 in the groove, it is more conducive to forming a boundary flange between the casting 4 and the material handle 41 of the casting 4, so as to facilitate the separation of the material handle 41 from the casting 4.

[0057] Furthermore, in this embodiment, the end surface (i.e., the upper end surface) of the flow guide 3 close to the movable mold assembly 2 is provided with a vertical insertion hole 34, and a vertical positioning pin 35 is provided in the vertical insertion hole 34. After the movable mold assembly 2 is lowered, the vertical positioning pin 35 is pressed, thereby effectively locking the position of the flow guide 3 in the fixed mold assembly 1, and the structure is simple and effective.

[0058] Embodiment 2

[0059] Figure 2a to Figure 2d Another embodiment of the extrusion casting device of the present invention is shown. The extrusion casting device of this embodiment is basically the same as the first embodiment, except that the casting 4 formed in this embodiment is a pipe sleeve, for which a core 5 is provided on the movable mold assembly 2, and the vertical socket 34 and the vertical positioning pin 35 are eliminated.

[0060] Furthermore, in this embodiment, the central gate 31 is a conical structure and the end of the material handle 41 close to the casting 4 has a larger diameter. Compared with the central gate 31 of the first embodiment, the structure is simplified.

[0061] In the extrusion casting device of this embodiment, when forming the pipe sleeve, the extrusion casting pressure can be effectively transmitted to the casting 4, and the pressure loss is small, which ensures that the pipe sleeve obtains good mechanical properties and saves material and processing costs.

[0062] Embodiment 3

[0063] Figure 3a to Figure 3d Another embodiment of the squeeze casting device of the present invention is shown. The squeeze casting device of this embodiment is basically the same as the embodiment 1, except that the casting 4 formed in this embodiment is a piston, the piston is inlaid with a wear-resistant ring 6, the core 5 is inlaid to form a cooling oil channel, and a ceramic preform is inlaid to improve the heat resistance of the throat. The ceramic preform is fixed in the vertical socket 34 on the upper end surface of the guide member 3, which can reduce the erosion of the aluminum layer of the wear-resistant ring 6 by the metal liquid, thereby improving the bonding reliability of the wear-resistant ring 6 and the aluminum alloy of the piston base.

[0064] Furthermore, in this embodiment, a groove is provided in the middle of the central gate 31 , and a filler 33 is provided in the groove, which is conducive to forming a boundary flange between the casting 4 and the material handle 41 of the casting 4 , thereby facilitating the separation of the material handle 41 from the casting 4 .

[0065] Furthermore, in this embodiment, the outer periphery of the flow guide 3 is provided with a positioning groove (of course, in other embodiments, a positioning hole can also be used as the positioning portion 36), and the fixed mold assembly 1 is provided with a radially arranged positioning pin 37, and the end of the positioning pin 37 is inserted into the positioning groove. The flow guide 3 can be effectively locked in the fixed mold assembly 1 by the radially arranged positioning pin 37, and the structure is simple and effective.

[0066] Embodiment 4

[0067] Figures 4a to 4d Another embodiment of the extrusion casting device of the present invention is shown. The extrusion casting device of this embodiment is basically the same as the embodiment 1, except that the casting 4 formed in this embodiment is a brake disc, preferably a ceramic reinforced aluminum-based composite brake disc. The central gate 31 is set to effectively solve the problem of metal liquid infiltration and filling of the ceramic preform. The metal liquid flows from top to bottom in the barrel, which is conducive to the accumulation of metal oxides in the material handle 41. The casting 4 has few defects, ensuring relatively balanced mechanical properties of the brake disc.

[0068] Embodiment 5

[0069] Figure 5a to Figure 5d Another embodiment of the squeeze casting device of the present invention is shown. The squeeze casting device of this embodiment is basically the same as the first embodiment, except that:

[0070] The extrusion casting device of this embodiment includes a movable mold assembly 2 and a fixed mold assembly 1 which are arranged relatively to each other in an upper and lower direction. The fixed mold assembly 1 is provided with a fixed mold punch 11, and the movable mold assembly 2 is provided with a movable mold punch 21. A guide member 3 is provided on the movable mold punch 21, and a center gate 31 is formed between the guide member 3 and the fixed mold assembly 1. The center gate 31 is perpendicular to the parting surface between the fixed mold assembly 1 and the movable mold assembly 2.

[0071] The extrusion casting device of this embodiment effectively solves the problem of difficulty in molding a large-diameter sealing cover and saves material and processing costs.

[0072] Furthermore, in this embodiment, the lower end surface of the flow guide 3 is provided with an arc-shaped flange 38. During the extrusion casting process, the arc-shaped flange 38 is conducive to the flow of the metal liquid, thereby helping to improve the molding quality of the casting 4.

[0073] Embodiment 6

[0074] Figures 6a to 6dAnother embodiment of the squeeze casting device of the present invention is shown. The squeeze casting device of this embodiment is basically the same as the fifth embodiment, except that:

[0075] In this embodiment, the guide member 3 is arranged on the fixed die punch 11, and a central gate 31 is formed between the guide member 3 and the movable die assembly 2. Correspondingly, an arc-shaped flange 38 is arranged on the upper end surface of the guide member 3. During the extrusion casting process, the arc-shaped flange 38 is conducive to the flow of molten metal, thereby helping to improve the molding quality of the casting 4.

[0076] The extrusion casting device of this embodiment solves the problem of difficulty in forming a large diameter external gear ring. There are fewer oxides and structural defects in the gear ring, and material and processing costs can be saved.

[0077] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. An extrusion casting device, comprising a fixed die assembly (1) and a movable die assembly (2) arranged opposite to each other, wherein the fixed die assembly (1) is provided with a fixed die punch (11), and the movable die assembly (2) is provided with a movable die punch (21), characterized in that: A flow guide (3) is also provided in the cavity of the fixed mold component (1) or the movable mold component (2), and a central gate (31) is provided in the middle of the flow guide component (3), and the central gate (31) is perpendicular to the parting surface between the fixed mold component (1) and the movable mold component (2).

2. The squeeze casting device according to claim 1, characterized in that: The central gate (31) is a conical structure and has a larger diameter at one end of the material handle (41) close to the casting (4).

3. The squeeze casting device according to claim 1, characterized in that: The diameter of the central gate (31) gradually increases from the middle to both ends.

4. The squeeze casting device according to claim 3, characterized in that: A groove is provided in the middle of the central gate (31), and a clamping ring (32) is provided in the groove.

5. The squeeze casting device according to claim 3, characterized in that: A groove is provided in the middle of the central gate (31), and a filling material (33) is provided in the groove.

6. The squeeze casting device according to any one of claims 1 to 5, characterized in that: The end surface of the flow guide (3) is provided with a vertical insertion hole (34), and a vertical positioning pin (35) is provided in the vertical insertion hole (34).

7. The squeeze casting device according to any one of claims 1 to 5, characterized in that: The flow guide (3) is provided with a positioning portion (36), and a positioning pin (37) is provided in the positioning portion (36).

8. The squeeze casting device according to any one of claims 1 to 5, characterized in that: The movable mold assembly (2) and the fixed mold assembly (1) are arranged vertically relative to each other.

9. An extrusion casting device, comprising a fixed die assembly (1) and a movable die assembly (2) arranged opposite to each other, wherein the fixed die assembly (1) is provided with a fixed die punch (11), and the movable die assembly (2) is provided with a movable die punch (21), characterized in that: The fixed die punch (11) is provided with a flow guide (3), and a central gate (31) is formed between the flow guide (3) and the movable die assembly (2); or the movable die punch (21) is provided with a flow guide (3), and a central gate (31) is formed between the flow guide (3) and the fixed die assembly (1); the central gate (31) is perpendicular to the parting surface between the fixed die assembly (1) and the movable die assembly (2).

10. The squeeze casting device according to claim 9, characterized in that: The end surface of the flow guide (3) is provided with an arc-shaped flange (38).

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