Powder metallurgy mold

Abstract

The utility model discloses a kind of powder metallurgy moulds, it includes, fixed mould, movable mould and main side mould, the surface of the fixed mould is equipped with forming cavity, and the side of this forming cavity is open structure, the open side of the forming cavity is movably matched in main side mould, extrusion block on it can be closed to forming cavity, the movable mould includes box type cover block, for cooperating with fixed mould after forming cavity is closed, complete the compaction forming of powder.The utility model is composed of main side mould, vice side mould, movable mould and ejecting system, cooperatively complete the forming and demoulding of complex green body, the type cavity is closed by the extrusion block of opposite movement of main side mould, ensure sealing and side forming quality, and ensure green body structure integrity when subsequent demoulding, ensure the quality of green body fired product.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy technology, and in particular to a powder metallurgy mold. Background Technology

[0002] In powder metallurgy, metal powder is typically pressed into green parts using a mold and hydraulic press, followed by sintering and other subsequent processing. Currently, a common production process involves pressing with an upper mold and ejecting with a lower mold to form the green parts. However, when the lower mold structure is complex, especially when the green part has deep grooves on its bottom and sides, significant frictional resistance occurs between the green part and the mold during ejection. This can easily lead to fractures or internal damage at structurally weak points in the green part, thus affecting the quality of the sintered parts and reducing product yield. Utility Model Content

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0004] To address the aforementioned problems, this utility model provides the following technical solution: a powder metallurgy mold includes a fixed mold, a moving mold, and a main side mold, wherein the surface of the fixed mold is provided with a forming cavity, and the side of the forming cavity has an open structure;

[0005] The main side mold is movably fitted to the open side of the molding cavity, and the extrusion block on it can close the molding cavity;

[0006] The moving mold includes a box-shaped cover block, which is used to cooperate with the fixed mold after the molding cavity is closed to complete the powder compression molding.

[0007] Preferably, the molding cavity is provided with at least three ejector grooves, and the top surfaces of the ejector grooves together constitute the maximum support surface of the green part.

[0008] Preferably, the main side mold includes a drive module, an embedding block, a first extrusion block, and a second extrusion block.

[0009] Preferably, there are two main side molds, and the main side molds are mirror-symmetrical through the molding cavity.

[0010] Preferably, the drive module is located on the outside of the mold and connected to the hydraulic press. The drive module is provided with an embedding block. The two ends of the embedding block are respectively provided with a first extrusion block and a second extrusion block. The first extrusion block of one main side mold and the second extrusion block of the other main side mold cooperate to close the molding cavity.

[0011] Preferably, the molding cavity has a first structure and a second structure, wherein a pin groove extends through the first structure.

[0012] Preferably, the molding cavity also has a third structure, which is sleeved on the secondary side mold and movably disposed in the molding cavity. The secondary side mold and the main side mold are arranged to cooperate with the hydraulic press and the main side mold.

[0013] Preferably, the molding cavities at both ends of the third structure are respectively provided with two ejector pin grooves.

[0014] The beneficial effects of this utility model are: the mold system consists of a main side mold, a secondary side mold, a moving mold and an ejection system, which work together to complete the forming and demolding of complex green blanks. The main side molds close the cavity through the extrusion blocks moving in opposite directions, ensuring the sealing and side forming quality, as well as ensuring the structural integrity of the green blank during subsequent demolding, thus ensuring the quality of the finished product after firing the green blank. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0016] Figure 1 This is a perspective view of the entire embodiment.

[0017] Figure 2 This is an example. Figure 1 Partial 3D view.

[0018] Figure 3 This is an example. Figure 2 A partial schematic diagram.

[0019] Figure 4 This is an example. Figure 2 A partial schematic diagram.

[0020] Figure 5 This is a three-dimensional view of the green part formed by the mold in this embodiment.

[0021] In the figure; fixed mold 100, first limiting block 101, side 1 101a, side 2 101b, second limiting block 102, side 3 102a, molding cavity 103;

[0022] Anisotropic structure 104, first structure 104a, second structure 104b, third structure 104c, support recess 105, ejector pin groove 106;

[0023] Moving mold 200, box-shaped cover block 200a, main side mold 300, drive module 301, embedding block 302, first extrusion block 303, second extrusion block 304, secondary side mold 400, cylinder 401;

[0024] Raw part 500, first feature 501, second feature 502, third feature 503, side surface 504, upper plane 505, lower plane 506. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0028] Example

[0029] Reference Figures 1 to 5 This embodiment of the present invention provides a powder metallurgy mold, including a fixed mold 100, a movable mold 200, and a main side mold 300. The surface of the fixed mold 100 is provided with a forming cavity 103, and the side of the forming cavity 103 has an open structure. The main side mold 300 is movably fitted to the open side of the forming cavity 103, and the extrusion block on it can close the forming cavity 103. The movable mold 200 includes a box-shaped cover block 200a, which is used to cooperate with the fixed mold 100 after the forming cavity 103 is closed to complete the powder pressing and forming. The forming cavity 103 is provided with at least three ejector pin grooves 10. 6. The top surface of the ejector groove 106 together constitutes the maximum support surface of the green part 500. The molding cavity 103 has a first structure 104a and a second structure 104b. One of the ejector grooves 106 passes through the first structure 104a. The molding cavity 103 also has a third structure 104c. The third structure 104c is sleeved on the secondary side mold 400 and movably disposed in the molding cavity 103. The secondary side mold 400 and the main side mold 300 are arranged in a hydraulic press and cooperate with the main side mold 300. Two ejector grooves 106 are respectively provided in the molding cavities 103 at both ends of the third structure 104c.

[0030] The main side mold 300 includes a drive module 301, an insert block 302, a first extrusion block 303, and a second extrusion block 304. There are two main side molds 300, and the main side molds 300 are mirror-symmetrical through the molding cavity 103. The drive module 301 is located on the outside of the mold and is connected to a hydraulic press. The drive module 301 is provided with an insert block 302. The insert block 302 has a first extrusion block 303 and a second extrusion block 304 at both ends. The first extrusion block 303 of one main side mold 300 cooperates with the second extrusion block 304 of the other main side mold 300 to close the molding cavity 103.

[0031] Specifically, the fixed mold 100 is provided with a molding cavity 103. The molding cavity adopts a three-sided open design, which facilitates the cleaning of powder residue and demolding of the blank in the molding cavity 103. The molding cavity is provided with a first structure 104a and a second structure 104b to form the main cavity of the part. The third structure 104c is used to form a special cylindrical groove feature. Three or more ejector grooves 106 are evenly distributed to jointly form the blank support surface.

[0032] The moving mold 200 adopts a box-shaped cover block structure 200a, which forms a closed cavity after being fitted with the fixed mold;

[0033] Two main side molds 300 are symmetrically distributed around the molding cavity 103. During powder loading, the side surface 101a of the first limiting block 101, the side surface 102a of the second limiting block 102, and the support recess 105 on the fixed mold 100 of the main side mold 300 jointly limit the movement of one of the main side molds 300. Simultaneously, the second extrusion block 304 on the other main side mold 300 moves again due to the combined limiting action of the side surface 101a of the first limiting block 101, the side surface 102a of the second limiting block 102, and the support recess 105. This achieves a state where the molding cavity 103 is slightly open on three sides and closed on the other side, which facilitates automatic powder filling and preform removal. The third structure 104c corresponds to the cylinder 401 fitted inside the auxiliary side mold 400.

[0034] Combination Figures 1-4 , Figure 5 As shown, during operation, the hydraulic press first drives the main side molds 300 to move towards each other, causing the first extrusion block 303 and the second extrusion block 304 to achieve a precise staggered fit. This fit completely seals the cavity, ensuring that no material leakage occurs during the molding process. Simultaneously, the cylinder 401, fitted inside the auxiliary side mold 400, extends synchronously into the molding cavity 103. This action will create the unique cylindrical feature of the green part during subsequent molding processes.

[0035] Once the mold is fully closed, the moving mold 200 begins to press down under the drive of the hydraulic press. Under high pressure, the material fully fills the entire cavity space and is uniformly compacted. The special structural design of the molding cavity 103 determines the geometry of the final preform: the first structure 104a corresponds to the first feature 501 of the preform, the second structure 104b corresponds to the second feature 502, and the cylinder 401 forms the third feature 503 of the preform. The entire high-pressure molding process requires strict control of pressure and holding time to ensure that the preform achieves the required density and dimensional accuracy.

[0036] The demolding process employs a step-by-step separation method to ensure the integrity of the green blank. First, the cylinder 401 of the secondary side mold 400 moves outward and exits the molding cavity, releasing the constraint on the third feature 503 of the green blank. Next, the moving mold 200 retracts upward, fully exposing the top surface 505 of the green blank. Finally, the main side mold 300 separates to both sides, releasing all constraints on the sides 504 of the green blank. This orderly demolding method effectively prevents deformation or damage to the green blank during demolding.

[0037] The ejection system is meticulously designed to ensure smooth demolding of the green blank. Ejector pins apply force evenly through three ejector recesses 106 distributed throughout the mold: one located in the first structure 104a near the end of the green blank, and the other two distributed through the third structure 104c. This arrangement allows the ejection force to cover more than 85% of the green blank's projected area, thus avoiding deformation caused by localized stress concentration. The movement of the ejector pins must be strictly synchronized to ensure that the green blank receives a uniform ejection force.

[0038] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0039] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A powder metallurgy die characterized by: It includes a fixed mold (100), a moving mold (200) and a main side mold (300). The surface of the fixed mold (100) is provided with a molding cavity (103), and the side of the molding cavity (103) is an open structure. The main side mold (300) is movably fitted to the open side of the molding cavity (103), and the extrusion block on it can close the molding cavity (103); The moving mold (200) includes a box-shaped cover block (200a), which is used to cooperate with the fixed mold (100) after the molding cavity (103) is closed to complete the pressing and molding of powder.

2. The powder metallurgy die of claim 1, wherein: The molding cavity (103) is provided with at least three ejector grooves (106), and the top surfaces of the ejector grooves (106) together constitute the maximum support surface of the green part (500).

3. The powder metallurgy die of claim 1, wherein: The main side module (300) includes a drive module (301), an embedding block (302), a first extrusion block (303), and a second extrusion block (304).

4. The powder metallurgy die of claim 3, wherein: The number of main side molds (300) is two, and the main side molds (300) are mirror-symmetrical through the molding cavity (103).

5. The powder metallurgy die of claim 3, wherein: The drive module (301) is located on the outside of the mold and connected to the hydraulic press. The drive module (301) is provided with an embedding block (302). The two ends of the embedding block (302) are respectively provided with a first extrusion block (303) and a second extrusion block (304). The first extrusion block (303) of one main side mold (300) and the second extrusion block (304) of the other main side mold (300) cooperate to close the molding cavity (103).

6. The powder metallurgy die of claim 2, wherein: The molding cavity (103) has a first structure (104a) and a second structure (104b), wherein a pin groove (106) extends through the first structure (104a).

7. The powder metallurgy die of claim 6, wherein: The molding cavity (103) also has a third structure (104c), which is sleeved on the secondary side mold (400) and movably disposed in the molding cavity (103). The secondary side mold (400) and the main side mold (300) are arranged in a hydraulic press and cooperate with the main side mold (300).

8. The powder metallurgy die of claim 7, wherein: The third structure (104c) has two ejector grooves (106) in the molding cavities (103) at both ends.

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