MIM product shaping method, MIM product and mold for MIM product

Abstract

The invention relates to the field of metal injection molding, and discloses a shaping method of an MIM product, the MIM product and a mold for the MIM product. The shaping method of the MIM product comprises the steps that a texture structure is formed on the surface, used for making contact with the MIM product, of a mold core in a shaping mold; the MIM product is placed in a shaping mold; and the shaping mold is closed, the MIM product is shaped through the mold core, and textures are formed on the surface of the MIM product. By adopting the shaping method designed by the invention, the required appearance texture can be formed on the surface of the MIM product while the MIM product is shaped, so that the situation that the texture is formed on the surface of the MIM product through secondary processing after shaping is avoided.

Description

Technical Field

[0001] The present application relates to the field of metal injection molding, and in particular to a shaping method for a MIM product, a MIM product, and a mold for a MIM product. Background Art

[0002] Metal Injection Molding (MIM) is a method of mixing metal powder with a binder for injection molding. First, the selected powder is mixed with a binder, and then the mixture is granulated and injected into the required shape. The binder is removed by degreasing and sintering to obtain a MIM product, or the product is made more perfect by subsequent shaping, surface treatment, heat treatment, machining, etc.

[0003] After sintering, the MIM products obtained by metal injection molding need to be shaped, that is, the MIM products with irregular deformation caused by sintering are shaped by high pressure of the mold, so as to reduce the deformation and size difference of the products and form a size shape closer to the final product. However, after the MIM products are shaped, a layer of sandy and slightly dark surface will be formed on the surface, and the surface will have uneven microscopic surface due to shrinkage. In order to ensure the exquisite appearance, the surface of the MIM products needs to be reprocessed by sandblasting, CNC machining, grinding and polishing, etc., which increases the processing steps and increases the manufacturing complexity, and also increases the cost. Summary of the invention

[0004] The embodiments of the present application disclose a shaping method for a MIM product, a MIM product and a mold for a MIM product, which can form a desired appearance texture on the surface of the MIM product while shaping the MIM product, thereby avoiding the need for secondary processing after shaping to form a texture on the surface of the MIM product.

[0005] In order to achieve the above objectives, in a first aspect, an embodiment of the present application discloses a shaping method for a MIM product, comprising:

[0006] The mold core in the shaping mold is used to form a texture structure on the surface that contacts the MIM product;

[0007] Placing the MIM product in the shaping mold;

[0008] The shaping mold is closed, the MIM product is shaped through the mold core, and a texture is formed on the surface of the MIM product.

[0009] As an optional implementation, the texture structure includes three-dimensional rack-shaped protrusions formed by irregular folded surfaces.

[0010] As an optional embodiment, the cross-sectional shape of the three-dimensional rack-shaped protrusion along the mold closing direction is a sawtooth shape, and the mold closing direction is a direction perpendicular to the surface of the mold core that is used to contact the MIM product.

[0011] As an optional implementation, there are multiple three-dimensional rack-shaped protrusions, the heights of the three-dimensional rack-shaped protrusions along the mold closing direction are equal, and the distances between two adjacent three-dimensional rack-shaped protrusions are the same.

[0012] As an optional implementation, the height of each of the three-dimensional rack-shaped protrusions along the mold closing direction is 50 μm-150 μm, and the distance between the tops of two adjacent three-dimensional rack-shaped protrusions is 70 μm-210 μm.

[0013] As an optional implementation, the texture structure includes a plurality of texture structure units, each of the texture structure units includes a plurality of rack-shaped protrusions parallel to each other, and the plurality of texture structure units are irregularly arranged.

[0014] As an optional implementation, the contour shapes of the plurality of texture structure units are different.

[0015] As an optional implementation, the areas of the multiple texture structure units are different.

[0016] As an optional embodiment, the mold core in the shaping mold is used to form a texture structure on the surface in contact with the MIM product, including:

[0017] The texture structure is formed on the surface of the mold core that is in contact with the MIM product by laser engraving or machining.

[0018] As an optional embodiment, the shaping mold includes a movable mold and a fixed mold, the mold core of the movable mold is used to form the texture structure on the surface in contact with the MIM product, and / or the mold core of the fixed mold is used to form the texture structure on the surface in contact with the MIM product.

[0019] As an optional implementation, a cavity for accommodating the MIM product is provided on the parting surface of the mold core, and the texture structure is formed on the inner wall of the cavity.

[0020] As an optional implementation, the shape and size of the cavity match the final shape and size of the MIM product, and shaping the MIM product through the mold core includes: shaping the MIM product through the cavity.

[0021] As an optional embodiment, before placing the MIM product in the shaping mold, the shaping method of the MIM product further includes: forming the MIM product by metal injection molding and then sintering.

[0022] In a second aspect, an embodiment of the present application discloses a MIM product, the surface of which has a texture structure, and the texture structure is formed by the shaping method of the MIM product described in the first aspect above.

[0023] As an optional implementation, the texture structure includes three-dimensional rack-shaped protrusions formed by irregular folded surfaces.

[0024] As an optional implementation, the texture structure includes a plurality of texture structure units, each of the texture structure units includes a plurality of rack-shaped protrusions parallel to each other, and the plurality of texture structure units are irregularly arranged.

[0025] As an optional implementation, the contour shapes of the plurality of texture structure units are different.

[0026] As an optional implementation, the areas of the multiple texture structure units are different.

[0027] As an optional implementation, the MIM product is a hardware component for a watch.

[0028] In a third aspect, an embodiment of the present application discloses a mold for a MIM product, wherein the mold includes a mold core, and a texture structure is formed on the surface of the mold core that is in contact with the MIM product.

[0029] As an optional implementation, a cavity for accommodating the MIM product is provided on the parting surface of the mold core, and the texture structure is formed on the inner wall of the cavity.

[0030] As an optional implementation, the texture structure includes three-dimensional rack-shaped protrusions formed by irregular folded surfaces.

[0031] As an optional implementation, the texture structure includes a plurality of texture structure units, each of the texture structure units includes a plurality of rack-shaped protrusions parallel to each other, and the plurality of texture structure units are irregularly arranged.

[0032] As an optional implementation, the contour shapes of the plurality of texture structure units are different.

[0033] As an optional implementation, the areas of the multiple texture structure units are different.

[0034] Compared with the prior art, the beneficial effects of the present application are at least:

[0035] The shaping method of MIM products, MIM products and molds for MIM products provided by the embodiments of the present invention design a texture structure according to the pattern form and the size of the three-dimensional effect to be processed, form a texture structure on the surface of the mold core in the shaping mold, place the MIM product in the shaping mold, so that the shaping mold can form a texture on the surface of the MIM product, place the shaping mold in a shaping device, and use the shaping device to punch out a MIM product with a texture. Such a shaping method avoids the need to perform secondary processing on the MIM product after shaping the MIM product to obtain the desired appearance surface with a texture, reduces the process of secondary processing of the MIM product, reduces manufacturing complexity, and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A flowchart of a shaping method for a MIM product disclosed in an embodiment of the present application;

[0038] Figure 2 A schematic cross-sectional view of a texture structure disclosed in an embodiment of the present application;

[0039] Figure 3 A schematic cross-sectional view of a shaping mold (during mold closing process) disclosed in an embodiment of the present application;

[0040] Figure 4 It is a plan view of the texture structure disclosed in the embodiment of the present application.

[0041] Description of reference numerals:

[0042] 100- plastic mold; 101- mold core;

[0043] 1-movable mold; 2-fixed mold; 3-texture structure; 31-three-dimensional rack-shaped protrusion; 32-texture structure unit. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the present invention, the directions or positional relationships indicated by the terms "inside" and "outside" are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0046] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the term "provided with" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The technical solution of the present invention will be further described below in conjunction with embodiments and drawings.

[0049] See also Figure 1 , Figure 1 The flowchart of the shaping method of the MIM product disclosed in the embodiment of the present application. The embodiment of the present application discloses a shaping method of the MIM product, and the shaping method of the MIM product includes:

[0050] S101, forming a texture structure 3 on the surface of the mold core 101 in the shaping mold 100 that contacts the MIM product;

[0051] S102, placing the MIM product in the shaping mold 100;

[0052] S103, closing the shaping mold 100, shaping the MIM product through the mold core 101, and forming a texture on the surface of the MIM product.

[0053] Before the texture structure 3 is formed on the surface of the mold core 101 that is in contact with the MIM product, the texture structure 3 needs to be designed according to the required size of the MIM product and the pattern texture of its surface.

[0054] Thus, in the shaping method, the main focus is on the shaping mold 100, specifically, the mold core 101 of the shaping mold 100. The mold core 101 is the part of the mold that directly contacts the MIM product. It is precisely processed according to the design requirements to form a specific texture structure 3. These texture structures 3 are intended to enhance the appearance texture, functionality or meet specific technical requirements of the product. Step S101 is to confirm that the material of the mold core 101 is suitable for contact with the MIM product. Usually, materials that are wear-resistant, high-temperature resistant and have no adverse reactions to metals are selected. Then, precision machining technology (such as CNC milling, electrospark machining, etc.) is used to process the required texture structure on the surface of the mold core 101 that is used to contact the MIM part. After that, the mold core 101 is cleaned and inspected to ensure that the surface is free of impurities and damage, and the texture is clear and accurate.

[0055] In step S102, the MIM product has been preliminarily formed, and the MIM product, which has been preliminarily formed but may not have a smooth surface or has not formed a final texture, is placed in the shaping mold 100. Specifically, the MIM product is taken out from the production line using a special tool or fixture, and is not directly touched by hand to avoid contamination or damage, and then the appearance and size of the MIM product are checked to ensure that it meets the requirements of the shaping mold 100, and then the MIM product is gently and accurately placed in the mold to ensure that it is completely in contact with the surface of the mold core 101 that is used to contact the MIM product.

[0056] In step S103, the shaping mold 100 is closed, that is, the upper mold and the lower mold (or side mold) are tightly closed to wrap the MIM product inside. Pressure is applied to the MIM product through the mold core 101, so that its surface forms a texture structure consistent with the surface of the mold core 101 during the process of being squeezed or deformed. Specifically, the mechanism for closing the shaping mold 100 is started to ensure that the various components of the mold are closed accurately, and then the pressure, temperature, time and other parameters in the shaping process are adjusted according to the process requirements, and then the shaping process is monitored to ensure that the MIM product is subjected to uniform and appropriate force to avoid product defects caused by overpressure or underpressure. When the shaping process is completed, the shaping mold 100 is opened, the MIM product is taken out, and its surface texture is checked to see if it meets the design requirements. In this way, the desired appearance texture can be formed on the surface of the MIM product while the MIM product is being shaped, avoiding the need for secondary processing after shaping to form a texture on the surface of the MIM product, reducing the secondary processing process and saving costs.

[0057] In some embodiments, see Figures 2 to 4, the texture structure 3 includes a three-dimensional rack-shaped protrusion 31 composed of irregular folded surfaces. That is to say, after the product is shaped by the mold core 101, a three-dimensional rack-shaped protrusion 31 composed of irregular folded surfaces is formed on the surface of the MIM product. In this way, the three-dimensional rack-shaped protrusion 31 formed on the surface of the MIM product not only makes the surface of the MIM product have a graphic texture effect with expressive appearance, but also increases the roughness and hardness of the surface of the MIM product, effectively improves the wear resistance of the MIM product, and prolongs the service life. In addition, this three-dimensional rack-shaped protrusion 31 provides more bite points on the contact surface, enhances the anti-slip performance of the MIM product in various use environments, especially in applications that require stable grip or anti-slip performance. In addition, the structural design of the irregular folded surface enables the MIM product to disperse stress more effectively when subjected to external force, thereby improving the mechanical strength and impact resistance of the MIM product.

[0058] Furthermore, if Figure 2 and Figure 3 As shown, the cross-sectional shape of the three-dimensional rack-shaped protrusion 31 along the mold closing direction X is a sawtooth shape, and the mold closing direction X is a direction perpendicular to the surface of the mold core 101 that is used to contact the MIM product. Figure 2 In other words, the texture formed by shaping on the surface of the MIM product has a sawtooth cross-sectional shape. The sawtooth three-dimensional rack-shaped protrusions 31 can provide a better contact surface, which helps to improve the overall structural strength and durability of the MIM product.

[0059] Of course, the cross-sectional shape of the three-dimensional rack-shaped protrusion 31 along the mold closing direction X can also be a rectangle or other shapes, which is not specifically limited in this embodiment.

[0060] Alternatively, if Figure 2As shown, there are multiple three-dimensional rack-shaped protrusions 31, and the height H of each three-dimensional rack-shaped protrusion 31 along the mold clamping direction X is equal and the spacing L between two adjacent three-dimensional rack-shaped protrusions 31 is the same. It should be noted that the three-dimensional rack-shaped protrusions 31 are multiple, which means that there are at least two three-dimensional rack-shaped protrusions 31, that is, the three-dimensional rack-shaped protrusions 31 can be two, three, four or ten, and this embodiment does not specifically limit this. In other words, the three-dimensional rack-shaped protrusions 31 present consistent equal height characteristics in the mold clamping direction X, and at the same time, the distance between two adjacent three-dimensional rack-shaped protrusions 31 remains consistent, forming a uniform and regular distribution pattern. In this way, since the height and spacing of all protrusions are consistent, this design makes the surface of the MIM product look neater and more orderly, and improves the overall aesthetics of the product. In addition, the evenly distributed three-dimensional rack-shaped protrusions 31 can ensure that the performance of the MIM product at different positions is consistent, avoiding performance fluctuations caused by local differences. In addition, since the height and spacing of the three-dimensional rack-shaped protrusions 31 are fixed, the design and manufacturing process of the mold core 101 can be more standardized and simplified, reducing the processing difficulty and cost.

[0061] Of course, the heights H of the three-dimensional rack-shaped protrusions 31 along the mold closing direction X may not be equal, and the distances L between two adjacent three-dimensional rack-shaped protrusions 31 may not be the same, which is not specifically limited in this embodiment.

[0062] Furthermore, if Figure 2 As shown, the height H of each three-dimensional rack-shaped protrusion 31 along the mold-closing direction X is 50μm-150μm, and the spacing L between the tops of two adjacent three-dimensional rack-shaped protrusions 31 is 70μm-210μm. In other words, the height H of the three-dimensional rack-shaped protrusion 31 along the mold-closing direction X can be 50μm, 100μm, 150μm or other values ​​in the range of 50μm-150μm, and the spacing L between the tops of two adjacent three-dimensional rack-shaped protrusions 31 can be 70μm, 100μm, 200μm or other values ​​in the range of 70μm-210μm. In this way, by designing a specific numerical range, it is ensured that the texture of the surface of the MIM product meets the required precision requirements, and at the same time, the consistency and uniformity of the surface texture of the product can be ensured, thereby improving the overall quality of the product. The fine texture design can add a unique visual effect to the MIM product, and enhance the aesthetics and grade of the MIM product. By adjusting the height and spacing of the three-dimensional rack-shaped protrusions 31, different styles of textures can be flexibly designed to meet diverse design requirements.

[0063] In some embodiments, in combination Figures 2 to 4, the texture structure 3 includes a plurality of texture structure units 32, each texture structure unit 32 includes a plurality of rack-shaped protrusions parallel to each other, and the plurality of texture structure units 32 are irregularly arranged. Among them, the plurality of texture structure units 32 means that the texture structure units 32 include at least two, that is, the texture structure units 32 are two or more, for example, the texture structure units 32 are five. In this way, the rack-shaped protrusions parallel to each other increase the roughness of the surface. When applied to handheld devices or tools, it can significantly improve the user's feel and increase the stability and comfort of holding. The structure of the rack-shaped protrusions enables the MIM product to disperse pressure and reduce single-point wear when subjected to external force, thereby improving the overall wear resistance. Due to the improvement in wear resistance, the texture structure 3 can extend the service life of the MIM product and reduce the frequency of replacement due to wear.

[0064] It should be noted that the contour shapes of the plurality of texture structure units 32 may be the same or different, and this embodiment does not specifically limit this.

[0065] Taking the different contour shapes of the multiple texture structure units 32 as an example, see Figure 4 , the contour shapes of multiple texture structure units 32 are different. That is to say, the contour shapes of each texture structure unit 32 are different. For example, the contour of one texture structure unit 32 is a rectangle, while the contour of the second texture structure unit 32 is a hexagon, and the contour of the third texture structure unit 32 is a triangle. The texture structure 3 is composed of these three texture structure units 32 with rectangular, hexagonal and triangular contours connected to each other, or, the contour shapes of some texture structure units 32 are curved, and the contour shapes of some texture structure units 32 are irregular polygons. In this way, different contour shapes may enhance the stability and bearing capacity of the entire texture structure 3 by supporting and biting each other. In addition, different contour shapes can form visual contrast and changes, making the overall design more vivid and interesting. Diverse contour shapes can meet the aesthetic needs of different consumers and make the product more attractive and competitive in the market. Different contour shapes may be designed for specific functional requirements, and the diverse contour shapes enable the texture structure unit 32 to adapt to a wider range of application scenarios and meet different usage requirements.

[0066] It should be noted that the areas of the plurality of texture structure units 32 may be the same or different, and this embodiment does not limit this. Figure 4, the areas of the multiple texture structure units 32 are different. That is to say, among the multiple texture structure units 32, there are both texture structure units 32 with large areas and texture structure units 32 with small areas, and these texture structure units 32 with different areas constitute the texture structure 3. For example, the first texture structure unit among the multiple texture structure units 32 has a larger area of ​​15 square centimeters, while the area of ​​the second texture structure unit is 10 square centimeters, and the area of ​​the third texture structure unit is 1 square centimeter. The texture structure 3 is composed of such a first texture structure unit with a large area, a second texture structure unit with a medium area, and a third texture structure unit with a small area. In this way, on the one hand, the texture structure units 32 of different areas form a contrast and hierarchy visually. On the other hand, the texture structure units 32 of different areas can be flexibly configured according to actual needs, and the functional zoning of the surface of the MIM product can be realized through the texture structure units 32 of different areas. In addition, when subjected to external forces, the texture structure units 32 of different areas can disperse the pressure more effectively. Units with large areas can withstand greater pressure, while units with small areas can provide more delicate support and protection in areas with less pressure.

[0067] In some embodiments, when the mold core 101 in the shaping mold 100 is used to form a texture structure 3 on the surface in contact with the MIM product, the texture structure 3 is formed by laser engraving or machining. Laser engraving technology can achieve ultra-fine processing and generate complex texture patterns, the realism and fineness of these patterns far exceed traditional machining methods. This makes the appearance of MIM products more refined and improves the overall texture and market competitiveness of the products. In addition, laser engraving and machining technology provide more possibilities for texture design. Designers can give full play to their creativity and achieve various unique texture effects to meet the needs of different customers and markets. Laser engraving is a non-contact processing method that does not cause mechanical damage to the mold surface, so it helps to extend the service life of the shaping mold 100. At the same time, the texture structure formed by laser processing is more uniform and stable, which also helps to reduce the wear of the mold core 101 during use.

[0068] In some embodiments, Figure 3As shown, the shaping mold 100 includes a movable mold 1 and a fixed mold 2. The mold core of the movable mold 1 is used to form a texture structure 3 on the surface in contact with the MIM product, and the mold core of the fixed mold 2 is used to form a texture structure 3 on the surface in contact with the MIM product. In this way, the mold cores of the movable mold 1 and the fixed mold 2 are both formed with a texture structure 3, ensuring that the upper and lower contact surfaces of the MIM product can obtain a consistent texture effect during the molding process, which helps to improve the overall aesthetics and appearance consistency of the product. In addition, compared with forming a texture structure 3 on only one surface, the double-sided texture design helps to reduce product defects caused by improper processing of a single-sided texture, such as uneven texture, blur, etc., thereby improving the overall quality of the product.

[0069] Optionally, in addition to forming the texture structure 3 on both the mold cores of the movable mold 1 and the fixed mold 2, the texture structure 3 can also be formed only on the surface of the mold core of the movable mold 1 that is used to contact the MIM product, or only on the surface of the mold core of the fixed mold 2 that is used to contact the MIM product. In this way, according to the specific needs of the MIM product, you can choose to process the texture on the movable mold 1 or the fixed mold 2. This flexibility makes it easier for the mold to adapt to different production needs and market changes. When the product needs to update the texture design or change the texture position, the mold with a single-sided texture can be adjusted and modified more quickly, shortening the time to market.

[0070] In some embodiments, a cavity for accommodating the MIM product is provided on the parting surface of the mold core 101, and the texture structure 3 is formed on the inner wall of the cavity. In this way, the texture structure 3 is directly formed on the inner wall of the cavity, so that the MIM product can directly obtain the desired texture effect during the molding process. The texture structure 3 on the inner wall of the cavity helps to more accurately control the shape and size of the product during the molding process, and reduce product defects caused by insufficient mold precision. In addition, the texture structure 3 can also reduce the wear of the inner wall of the mold during the molding process of the MIM product to a certain extent, thereby extending the service life of the mold.

[0071] Among them, the parting surface refers to the part where the movable mold 1 and the fixed mold 2 are in contact when the shaping mold 100 is in a closed state after the molding, and the cavity refers to the cavity between the movable mold 1 and the fixed mold 2 for accommodating the MIM product when the shaping mold 100 is in a closed state.

[0072] Furthermore, the shape and size of the cavity match the final shape and size of the MIM product, and shaping the MIM product through the mold core includes shaping the MIM product through the cavity. In this way, since the shape and size of the cavity directly match the final shape and size of the product, the MIM product can accurately replicate the shape and size of the cavity during the molding process, thereby achieving high-precision molding. This precise control helps reduce product defects and improve product quality.

[0073] Before placing the MIM product in the shaping mold in step S102, Figure 1 As shown, the shaping method also includes:

[0074] S201, forming a MIM product by metal injection molding and then sintering.

[0075] The second aspect of the present application discloses a MIM product, the surface of which has a texture structure 3, and the texture structure 3 is formed by the shaping method of the first aspect. The MIM product with the texture structure 3 shaped by the shaping method of the first aspect achieves a graphic texture effect with expressive appearance while improving the shaping accuracy of the MIM product and improving the hardness and mechanical strength of the surface of the MIM product. It avoids the need for secondary processing to form the final desired appearance texture on the surface of the MIM product after the MIM product is shaped, and achieves that while the product is being shaped under pressure, the texture is pressed into the surface of the product at the same time to form a texture effect on the surface of the product, reducing the secondary processing process and saving costs.

[0076] Optionally, the MIM product is a hardware component for a watch. The MIM product has a dense metal structure and good mechanical properties, which can meet the requirements of watch hardware components for strength, hardness and durability. And its outer surface has a delicate texture effect, which meets the requirements of watch hardware components for aesthetic appearance.

[0077] It is worth noting that the watch can be a mechanical watch, an electronic watch, a smart watch or other watches with similar functions and uses, and the hardware components refer to the watch case, strap, clasp, bottom cover or other structural components of the watch, which is not specifically limited in this embodiment.

[0078] The third aspect of the present application discloses a mold for MIM products, the mold comprising a mold core 101, the mold core 101 is used to form a texture structure 3 on the surface in contact with the MIM product. The MIM product shaped by the mold not only meets the size of the final product, but also has the required texture effect on its surface, achieving a graphic texture effect with expressive appearance while improving the shaping accuracy of the MIM product, and improving the hardness and mechanical strength of the surface of the MIM product. Moreover, according to the design of different MIM products, the mold only needs to change the texture structure 3 on the mold according to the MIM product, so as to shape the required MIM product, thereby improving the flexibility of mold application while meeting the diverse needs of the market.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shaping method for MIM products, characterized in that: include: The mold core in the shaping mold is used to form a texture structure on the surface that contacts the MIM product; Placing the MIM product in the shaping mold; The shaping mold is closed, the MIM product is shaped through the mold core, and a texture is formed on the surface of the MIM product.

2. The shaping method of MIM products according to claim 1, characterized in that: The texture structure includes three-dimensional tooth-shaped protrusions formed by irregular folded surfaces.

3. The shaping method of MIM products according to claim 2, characterized in that: The cross-sectional shape of the three-dimensional rack-shaped protrusion along the mold closing direction is a sawtooth shape, and the mold closing direction is a direction perpendicular to the surface of the mold core that is used to contact the MIM product.

4. The shaping method of MIM products according to claim 3, characterized in that: There are a plurality of three-dimensional rack-shaped protrusions, each of which has an equal height along the mold clamping direction and a same spacing between two adjacent three-dimensional rack-shaped protrusions.

5. The shaping method of MIM products according to claim 4, characterized in that: The height of each of the three-dimensional rack-shaped protrusions along the mold closing direction is 50 μm-150 μm, and the distance between the tops of two adjacent three-dimensional rack-shaped protrusions is 70 μm-210 μm.

6. The shaping method of MIM products according to claim 1, characterized in that: The texture structure includes a plurality of texture structure units, each of the texture structure units includes a plurality of rack-shaped protrusions parallel to each other, and the plurality of texture structure units are arranged irregularly.

7. The shaping method of MIM products according to claim 6, characterized in that: The contour shapes of the plurality of texture structure units are different.

8. The shaping method of MIM products according to claim 6, characterized in that: The areas of the plurality of texture structure units are different.

9. The shaping method of MIM products according to claim 1, characterized in that: The mold core in the shaping mold is used to form a texture structure on the surface in contact with the MIM product, including: The texture structure is formed on the surface of the mold core that is in contact with the MIM product by laser engraving or machining.

10. The shaping method of MIM products according to claim 1, characterized in that: The shaping mold includes a movable mold and a fixed mold, the mold core of the movable mold is used to form the texture structure on the surface in contact with the MIM product, and / or the mold core of the fixed mold is used to form the texture structure on the surface in contact with the MIM product.

11. The shaping method of MIM products according to claim 1, characterized in that: A cavity for accommodating the MIM product is provided on the parting surface of the mold core, and the texture structure is formed on the inner wall of the cavity.

12. The shaping method of MIM products according to claim 11, characterized in that: The shape and size of the cavity match the final shape and size of the MIM product, and shaping the MIM product through the mold core includes: shaping the MIM product through the cavity.

13. The shaping method of MIM products according to claim 1, characterized in that: Before placing the MIM product in the shaping mold, the shaping method of the MIM product further comprises: forming the MIM product by metal injection molding and then sintering.

14. A MIM product, characterized in that: The surface of the MIM product has a texture structure, and the texture structure is formed by the shaping method of the MIM product according to claims 1-13.

15. A MIM product according to claim 14, characterized in that: The texture structure includes three-dimensional tooth-shaped protrusions formed by irregular folded surfaces.

16. A MIM product according to claim 14, characterized in that: The texture structure includes a plurality of texture structure units, each of the texture structure units includes a plurality of rack-shaped protrusions parallel to each other, and the plurality of texture structure units are arranged irregularly.

17. The MIM product according to claim 14, characterized in that: The contour shapes of the plurality of texture structure units are different.

18. The MIM product according to claim 14, characterized in that: The areas of the plurality of texture structure units are different.

19. The MIM product according to claim 14, characterized in that: The MIM products are hardware components for watches.

20. A mold for MIM products, characterized in that: The mold comprises a mold core, and a texture structure is formed on the surface of the mold core for contacting the MIM product.

21. The mold for MIM products according to claim 20, characterized in that: A cavity for accommodating the MIM product is provided on the parting surface of the mold core, and the texture structure is formed on the inner wall of the cavity.

22. The mold for MIM products according to claim 20, characterized in that: The texture structure includes three-dimensional tooth-shaped protrusions formed by irregular folded surfaces.

23. The mold for MIM products according to claim 20, characterized in that: The texture structure includes a plurality of texture structure units, each of the texture structure units includes a plurality of rack-shaped protrusions parallel to each other, and the plurality of texture structure units are arranged irregularly.

24. The mold for MIM products according to claim 23, characterized in that: The contour shapes of the plurality of texture structure units are different.

25. The mold for MIM products according to claim 23, characterized in that: The areas of the plurality of texture structure units are different.

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