A powder metallurgy mold

Abstract

The present invention discloses a powder metallurgy mold, including a female mold, an upper mold part and a lower mold, wherein the female mold is provided with a molding cavity and a pressing cavity, and the upper mold part includes a relatively movable upper mold component and an upper mold sleeve, wherein the upper mold component and the lower mold jointly act on the pressing cavity, and the upper mold sleeve acts on the molding cavity. In the pressing process of the powder metallurgy mold, a part of the powder is in the molding cavity, and the other part of the powder is in the pressing cavity; the powder in the molding cavity is pressed by the upper mold sleeve and the female mold together, and the powder in the pressing cavity is pressed by the upper mold component and the lower mold together. Since the powder in the pressing cavity is subjected to greater pressure than the powder in the molding cavity, the powder density in the pressing cavity is greater than that in the molding cavity. When the powder in the pressing cavity and the powder in the molding cavity are diffused and integrated, a product with tight inside and loose outside is made, which improves the toughness and other properties of the product, improves the overall strength of the product, and thus reduces the damage rate of the product during use, reduces the number of replacements, and greatly saves the production cost of the enterprise.

Description

Technical Field

[0001] The invention relates to the technical field of powder molding, in particular to a powder metallurgy mold. Background Art

[0002] Powder metallurgy is a technology that uses metal powder or a mixture of metal powder and non-metal powder as raw materials to produce metal materials, composite materials and various types of products. Powder metallurgy technology has a series of advantages such as significant energy saving, material saving, excellent performance, high product precision and good stability, and is suitable for mass production.

[0003] Currently in the field of powder metallurgy, most products made from molds have similar densities in various parts. Therefore, the maximum pressure that each part can withstand is also similar. During actual use, the forces on various parts of the product are uneven. Since the overall density of the product is similar, its overall rigidity and hardness are strong, but it also has shortcomings, such as low toughness and high brittleness, which is comprehensively reflected in insufficient strength. When subjected to local force, it is easy to break, resulting in the need for frequent replacement, which consumes labor and material costs and increases the company's production input costs. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a powder metallurgy mold.

[0005] The present invention discloses a powder metallurgy mold, which includes a female mold, an upper mold part and a lower mold, wherein the upper mold part and the lower mold part are both movably arranged on the female mold; the female mold is provided with a molding cavity and a pressing cavity, wherein the molding cavity is connected to the pressing cavity, and the cross section of the molding cavity is larger than the cross section of the pressing cavity; the upper mold part includes a relatively movable upper mold component and an upper mold sleeve, wherein the upper mold component and the lower mold act together on the pressing cavity, and the upper mold sleeve acts on the molding cavity.

[0006] According to one embodiment of the present invention, the upper mold part further comprises an elastic member, one side of the elastic member abuts against the upper mold assembly, and the other side of the elastic member abuts against the upper mold sleeve.

[0007] According to one embodiment of the present invention, the upper mold collar is provided with a first boss, the first boss moves on the upper mold component, and the first boss abuts against the upper mold component.

[0008] According to one embodiment of the present invention, the upper mold assembly includes an upper mold piece and an upper mold pressure cover. The upper mold piece is detachably connected to the upper mold pressure cover. The upper mold piece passes through the upper mold sleeve. The upper mold piece and the lower mold work together in the pressing cavity. The upper mold pressure cover is sleeved on the upper mold sleeve, and the upper mold pressure cover and the upper mold sleeve are relatively movable.

[0009] According to one embodiment of the present invention, the upper mold part includes an upper mold cover and an upper mold column. The upper mold cover is detachably connected to the upper mold pressure cover. The upper mold column is arranged on the upper mold cover. The upper mold column passes through the upper mold sleeve and is movably arranged in the pressing cavity.

[0010] According to one embodiment of the present invention, the upper mold cover is provided with a movable cavity, and the upper mold sleeve is movably arranged in the movable cavity.

[0011] According to one embodiment of the present invention, the lower mold includes a lower mold cover and a lower mold column, the lower mold cover is arranged on the lower mold column, and the lower mold column and the upper mold component act together in the pressing cavity.

[0012] The beneficial effects of the present invention are:

[0013] During the pressing process of the powder metallurgy mold, part of the powder is in the molding cavity and the other part of the powder is in the pressing cavity; the powder in the molding cavity is pressed by the upper mold sleeve and the female mold, while the powder in the pressing cavity is pressed by the upper mold assembly and the lower mold. Since the powder in the pressing cavity is subjected to greater pressure than the powder in the molding cavity, the powder density in the pressing cavity is greater than that in the molding cavity. When the powder in the pressing cavity and the powder in the molding cavity are diffused and integrated, a product with a tight inside and a loose outside is made, which improves the product's toughness and other properties, improves the overall strength of the product, and thereby reduces the damage rate of the product during use, reduces the number of replacements, and greatly saves the company's production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0015] Figure 1 It is a schematic diagram of the working state of the powder metallurgy mold in the embodiment;

[0016] Figure 2 It is a cross-sectional structural diagram of the upper mold in the embodiment;

[0017] Figure 3 is a cross-sectional structural diagram of the upper gland in the embodiment;

[0018] Figure 4 It is a cross-sectional structural diagram of the upper mold sleeve in the embodiment.

[0019] Description of reference numerals:

[0020] 1. Female mold; 11. Molding cavity; 12. Pressing cavity; 2. Upper mold part; 21. Upper mold assembly; 211. Upper mold member; 2111. Upper mold cover; 2112. Upper mold column; 212. Upper mold pressure cover; 2121. Movable cavity; 21211. Step; 22. Upper mold sleeve; 221. First boss; 222. Through hole; 23. Elastic member; 3. Lower mold; 31. Lower mold cover; 32. Lower mold column; 4. Powder. DETAILED DESCRIPTION

[0021] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0022] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] Please refer to Figure 1 , Figure 1 The figure is a schematic diagram of the working state of the powder metallurgy mold in the embodiment. As shown in the figure, a powder metallurgy mold includes a female mold 1, an upper mold part 2 and a lower mold 3, and the upper mold part 2 and the lower mold 3 are both movably arranged on the female mold 1; the female mold 1 is provided with a molding cavity 11 and a pressing cavity 12, the molding cavity 11 is used for molding a part of the powder 4, and the pressing cavity 12 is used for molding another part of the powder 4, the molding cavity 11 is connected to the pressing cavity 12, and the cross section of the molding cavity 11 is larger than the cross section of the pressing cavity 12; the upper mold part 2 includes an upper mold component 21 and an upper mold sleeve 22, the upper mold component 21 and the upper mold sleeve 22 are movably arranged, the upper mold component 21 and the lower mold 3 act together on the pressing cavity 12, and the upper mold sleeve 22 acts on the molding cavity 11.

[0024] During the product pressing process, the powder 4 is placed in the molding cavity 11 and the pressing cavity 12 respectively, and the upper mold component 21 drives the upper mold sleeve 22 to move in the direction close to the molding cavity 11, and the upper mold sleeve 22 abuts against the molding cavity 11 to press the powder 4 in the molding cavity 11, and the upper mold component 21 continues to move to the pressing cavity 12, and the upper mold component 21 and the lower mold 3 act together on the powder 4 in the pressing cavity 12 to form it, and then the upper mold component 21 moves to the initial position, and the lower mold 3 moves in the direction of the movement of the upper mold component 21, and the pressing cavity 12 is formed. The powder 4 is pushed to the molding cavity 11, and the powder 4 in the molding cavity 11 is in close contact with the powder 4 in the pressing cavity 12; the powder 4 in the molding cavity 11 is subjected to a smaller pressure, while the powder 4 in the pressing cavity 12 is subjected to a larger pressure, so the powder 4 in the pressing cavity 12 has a higher density than the powder 4 in the molding cavity 11; when the two parts of the powder 4 are spliced ​​together, due to the density difference between the two parts, the powder 4 formed in the pressing cavity 12 diffuses to the powder 4 formed in the molding cavity 11, and then merges into one, and the formed product has the characteristics of being tight inside and loose outside. Specifically, in the product that is tight inside and loose outside, the middle part of the product has higher rigidity than the outside of the product, and the outside of the product has higher toughness than the middle part of the product. The part with high rigidity of the product is subjected to greater pressure, and the part with high toughness of the product is subjected to greater deformation. The overall strength of the product is improved through the combination of high rigidity and high toughness.

[0025] In specific application, the molding cavity 11 is arranged at the center of one side of the female shape 1 , and the pressing cavity 12 is arranged at the center of the other side of the female shape 1 . The distance from the center to the edge is consistent. Even if the female mold 1 rotates, the position of the center will not change. The upper mold part 2 and the lower mold 3 can accurately press the molding cavity 11 and the pressing cavity 12, and in the pressing process, the upper mold part 2 and the lower mold 3 both act on the center of the female mold 1, the force positions correspond, the force is centered on the center of the circle, and the circumference is evenly diffused. The parts symmetrical with the center of the circle receive the same force, so the female mold 1 can be stably maintained in the corresponding position; during pressing, the upper mold sleeve 22 on the molding cavity 11 and the upper mold assembly 21 and the lower mold 3 in the pressing cavity 12 vibrate. If the distance from the center of the molding cavity 11 to the periphery of the female mold 1 is not equal, that is, the molding cavity 11 is not in the center of the female mold 1, then the side with a shorter distance between the molding cavity 11 and the periphery of the female mold 1 can withstand less pressure and is prone to breakage, causing damage to the female mold 1 and affecting the service life of the female mold 1; similarly, if the pressing cavity 12 is not set at the center of the female mold 1, it will also affect the service life of the female mold 1.

[0026] Please refer to Figure 2 and Figure 3 , Figure 2 It is a cross-sectional structural diagram of the upper mold in the embodiment; Figure 3 is a cross-sectional structural diagram of the upper gland in the embodiment; Figure 4 1 is a cross-sectional structural diagram of the upper mold sleeve in the embodiment. Figure 1 As shown in the figure, the upper mold assembly 21 includes an upper mold member 211 and an upper mold pressure cover 212, the upper mold member 211 is bolted to the upper mold pressure cover 212, the upper mold member 211 passes through the upper mold sleeve 22, and the upper mold member 211 can move in the pressing chamber 12, the upper mold pressure cover 212 is sleeved on the upper mold sleeve 22, and the upper mold pressure cover 212 and the upper mold sleeve 22 can move relatively, and the upper mold member 211 and the lower mold 3 act together on the powder 4 in the pressing chamber 12. The upper mold member 211 includes an upper mold cover 2111 and an upper mold column 2112, the upper mold cover 2111 is bolted to the upper mold pressure cover 212, one end of the upper mold column 2112 is connected to the upper mold cover 2111, and the other end thereof acts together with the lower mold 3 on the powder 4 in the pressing chamber 12. The upper mold cover 212 is provided with an active cavity 2121, one end of the upper mold sleeve 22 is movably arranged in the active cavity 2121, and the other end thereof passes through the upper mold cover 212, and the upper mold column 2112 passes through the upper mold sleeve 22. Specifically, a through hole 222 is provided in the center of the upper mold sleeve 22, and the upper mold column 2112 moves in the through hole 222.

[0027] The upper mold sleeve 22 is provided with a first boss 221. Preferably, a step 21211 is provided in the movable cavity 2121. The first boss 221 can move in the movable cavity 2121. At the same time, the first boss 221 abuts against the step 21211. Through the abutment setting of the first boss 221 and the step 21211, the first boss 221 cannot pass through the movable cavity 2121 during the movement, thereby preventing the upper mold sleeve 22 from falling off from the movable cavity 2121.

[0028] Preferably, the upper mold part 2 further includes an elastic member 23, one side of the elastic member 23 abuts against the upper mold cover 2111, and the other side thereof abuts against the first boss 221. The upper mold cover 2111 compresses the elastic member 23, and the elastic member 23 acts on the first boss 221. The first boss 221 drives the upper mold sleeve 22 to act on the powder 4 in the molding cavity 11. When the elastic member 23 is compressed, the upper mold column 2112 gradually penetrates the upper mold sleeve 22 and acts on the powder 4 in the pressing cavity 12. Preferably, the elastic member 23 is a spring.

[0029] Please refer to Figure 1 As shown in the figure, the lower mold 3 includes a lower mold cover 31 and a lower mold column 32. The lower mold cover 31 is arranged on the lower mold column 32. The lower mold column 32 and the upper mold column 2112 act together on the powder 4 in the pressing cavity 12. Preferably, the lower mold column 32 can penetrate the pressing cavity 12 and the molding cavity 11 at the same time. After the product is made, the lower mold column 32 can push the product out of the molding cavity 11, which is convenient for unloading.

[0030] During the product pressing process, the powder 4 is placed in the molding cavity 11 and the pressing cavity 12 respectively, the upper mold cover 2111 moves toward the direction close to the pressing cavity 12, and the upper mold sleeve 22 abuts against the powder 4 in the molding cavity 11; then, the upper mold cover 2111 begins to compress the elastic member 23, the elastic member 23 acts on the first boss 221, the first boss 221 acts on the upper mold sleeve 22, and the upper mold sleeve 22 presses the powder 4 in the molding cavity 11; while the upper mold cover 2111 compresses the elastic member 23, the upper mold component 21 continues to move toward the pressing cavity 12, the step 21211 begins to move away from the first boss 221, the upper mold column 2112 gradually penetrates the through hole 222, the upper mold column 2112 continues to move to the pressing cavity 12, and the upper mold column 2112 and the lower mold The columns 32 act together on the powder 4 in the pressing cavity 12 and shape it; then, the upper column 2112 moves a distance toward the initial position, and the lower mold 32 moves a distance in the direction of the movement of the upper column 2112, and pushes the powder 4 formed in the pressing cavity 12 to the molding cavity 11, and the powder 4 in the molding cavity 11 and the powder 4 in the pressing cavity 12 are diffused and integrated to form a product that is tight inside and loose outside; the upper column 2112 moves toward the initial position, and the step 21211 begins to move toward the first boss 221 until it contacts the first boss 221, then, the step 21211 abuts against the first boss 221 and moves toward the initial position, and the lower column 32 continues to move toward the upper column 2112, and the lower column 32 pushes the product out of the molding cavity 11.

[0031] To sum up, during the pressing process of the powder metallurgy mold, part of the powder is in the molding cavity, and the other part of the powder is in the pressing cavity; the powder in the molding cavity is pressed by the upper mold sleeve and the female mold, while the powder in the pressing cavity is pressed by the upper mold assembly and the lower mold. Since the powder in the pressing cavity is subjected to greater pressure than the powder in the molding cavity, the powder density in the pressing cavity is greater than that in the molding cavity. When the powder in the pressing cavity and the powder in the molding cavity are diffused and integrated, a product with a tight inside and a loose outside is made, which improves the product's toughness and other properties, improves the overall strength of the product, and thus reduces the damage rate of the product during use, reduces the number of replacements, and greatly saves the company's production costs.

[0032] The above is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A powder metallurgy mold, characterized in that: include: A female mold (1), an upper mold portion (2) and a lower mold (3), wherein the upper mold portion (2) and the lower mold (3) are both movably arranged on the female mold (1); the female mold (1) is provided with a molding cavity (11) and a pressing cavity (12), wherein the molding cavity (11) is connected to the pressing cavity (12), and the cross section of the molding cavity (11) is larger than the cross section of the pressing cavity (12); the upper mold portion (2) comprises a relatively movable upper mold component (21) and an upper mold sleeve (22), wherein the upper mold component (21) and the lower mold (3) act together on the pressing cavity (12), and the upper mold sleeve (22) acts on the molding cavity (11); The upper mold component (21) comprises an upper mold member (211) and an upper mold pressure cover (212); the upper mold member (211) is detachably connected to the upper mold pressure cover (212); the upper mold member (211) passes through the upper mold sleeve (22); the upper mold member (211) and the lower mold (3) act together on the pressing cavity (12); the upper mold pressure cover (212) is sleeved on the upper mold sleeve (22), and the upper mold pressure cover (212) and the upper mold sleeve (22) are relatively movable; The upper mold member (211) comprises an upper mold cover (2111) and an upper mold column (2112); the upper mold cover (2111) is detachably connected to the upper mold pressing cover (212); the upper mold column (2112) is arranged on the upper mold cover (2111); the upper mold column (2112) passes through the upper mold sleeve (22); and the upper mold column (2112) is movably arranged in the pressing cavity (12); The upper mold cover (212) is provided with a movable cavity (2121), and the upper mold sleeve (22) is movably arranged in the movable cavity (2121); the upper mold sleeve (22) is provided with a first boss (221) in an annular manner, the first boss (221) is movable on the upper mold component (21), and the first boss (221) abuts against the upper mold component (21); the upper mold part (2) also includes an elastic member (23), one side of the elastic member (23) abuts against the upper mold component (21), and the other side thereof abuts against the upper mold sleeve (22).

2. The powder metallurgy mold according to claim 1, characterized in that: The lower mold (3) comprises a lower mold cover (31) and a lower mold column (32); the lower mold cover (31) is arranged on the lower mold column (32); the lower mold column (32) and the upper mold component (21) act together on the pressing cavity (12).

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