Metal assembly with precisely fitting assembly faces and method for manufacturing the same

Abstract

The application discloses a metal assembly with precisely and tightly fitted assembling surfaces and a manufacturing method thereof, and belongs to the technical field of metal assembly manufacturing, which comprises the following steps: combining metal blanks together to form a combined blank; performing compression deformation on the combined blank to obtain a compression assembly; marking the positions of the periphery of the compression assembly; disassembling the compression assembly, and cleaning all surfaces of the side of each metal blank to be assembled; and combining each metal blank together after accurate repositioning according to the position marking, so as to obtain the metal assembly with precisely and tightly fitted assembling surfaces. In the technical scheme, the compression method has simple manufacturing procedures, short cycle, high production efficiency and material utilization rate, low production cost, and is easy for mass production; the metal assembly is accurately positioned during assembly, the assembling surfaces have high fitting degree, and the metal assembly has excellent sealing performance and mechanical properties, long service life, and high reliability, and is particularly suitable for being used as a high-power device high-efficiency heat sink, a closed mold, a connecting rod and other metal assemblies.

Description

Technical Field

[0001] This invention belongs to the field of metal assembly manufacturing technology, and in particular relates to a metal assembly with precise and tight fitting of the assembly surfaces and its manufacturing method, which is especially suitable for the manufacturing of metal assemblies such as high-efficiency heat sinks for high-power devices, closed molds and connecting rods. Background Technology

[0002] High-power device heat sinks, closed molds, and connecting rods, among other metal assemblies, all require assembly during manufacturing, demanding extremely high precision and tightness in the fit of the assembly surfaces. Currently, the surfaces to be assembled in traditional metal assemblies are typically machined planes, often requiring multiple cutting operations, sometimes even precision machining, to achieve a smooth surface. This can involve expensive, time-consuming, and costly CNC machining. The metal assemblies are then assembled using mechanical or metallurgical bonding methods to ensure a close fit between the assembly surfaces, meeting requirements for high strength and sealing. However, even with the highest precision machining equipment, while the surfaces appear smooth after machining, microscopic examination reveals numerous pits and imperfections. These imperfections prevent a tight fit, hindering 100% conformation and leading to uneven stress distribution or poor sealing. Consequently, the durability and strength of the metal assemblies fail to meet performance requirements. It is evident that the traditional manufacturing method for the surfaces to be assembled in this type of metal assembly not only involves numerous processing steps, long processing cycles, serious material waste, and high processing costs, but also usually results in large errors in the fitting accuracy and processing accuracy of the surfaces to be assembled, and poor fit during secondary assembly.

[0003] Therefore, there is an urgent need to develop a short-process, low-cost, and high-efficiency manufacturing method for assembly surfaces to meet the high-standard application requirements of precise and tight fitting of metal assemblies. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing metal assembly manufacturing technologies and provide a metal assembly with precise and tight fit of the assembly surfaces and its manufacturing method. The invention employs a pressing method to plastically deform a composite blank composed of at least two metal blanks. Under external pressure, the surfaces of the metal blanks to be assembled are mutually constrained and deformed, exhibiting an interlocking characteristic. The resulting metal assembly has a very tight fit of the assembly surfaces, and the interlocking of the surfaces is used for positioning and reinforcement. This invention solves the problems of current methods for manufacturing metal assemblies with precise and tight fit, such as the need for precision machining of the surfaces to be assembled, insufficient fit, and low mechanical properties. It achieves higher and tighter fit of the assembly surfaces. The production process of the metal assembly is simple, with high raw material utilization, short production cycle, low manufacturing cost, and convenient assembly and disassembly. It is suitable for mass production and meets the requirements of high sealing and high strength of the assembly surfaces. It is particularly suitable for manufacturing metal assemblies such as high-efficiency heat sinks for high-power devices, closed molds, and connecting rods.

[0005] According to a first aspect of the present invention, a method for manufacturing a metal assembly with precisely and tightly fitted assembly surfaces is provided, comprising the following steps:

[0006] Step 1: Combine no less than two pieces of the aforementioned metal billet together to form a composite billet;

[0007] Step 2: Apply pressure to the combined blank from the top and bottom or from all sides to deform it so that the surfaces to be assembled can be precisely and tightly fitted to obtain a pressed part;

[0008] Step 3: Mark the corresponding positions around the pressed parts;

[0009] Step 4: Disassemble the press-fit parts and clean all surfaces of the side to be assembled on each metal blank.

[0010] Step 5: After accurately repositioning and aligning each metal blank according to the marked positions, assemble them together to obtain a metal assembly with precisely and tightly fitted surfaces.

[0011] Here, "assembly surface" specifically refers to the mating surface of metal assemblies such as high-efficiency heat sinks, closed molds, and connecting rods of high-power devices during the assembly process.

[0012] Furthermore, before step 1, the method further includes: performing surface pretreatment on the surface of the metal billet to be assembled.

[0013] Furthermore, the surface pretreatment method includes at least one of degreasing, deoxidation, or preliminary smoothing.

[0014] Furthermore, in step 2, a release agent may or may not be applied to the surfaces to be assembled before pressing.

[0015] Further, in step 2, the combined billet is pressed at room temperature or under heating conditions, and the heating is offline heating or online heating; the pressing method is at least one of rolling, forging, extrusion, drawing or explosive forming, and the deformation amount of the pressing is 1% to 30%.

[0016] Furthermore, in step 4, the interior of the surface to be assembled of each metal billet is machined according to the application requirements to obtain the required internal configuration.

[0017] Furthermore, in step 5, the metal assembly undergoes performance-regulating heat treatment.

[0018] Furthermore, in step 5, the metal assembly is mechanically connected, subjected to diffusion heat treatment, or welded to the assembly surfaces to achieve a precise and tight mechanical or metallurgical bond between the assembly surfaces.

[0019] Furthermore, in step 5, the outer surface of the metal assembly is subjected to surface treatment or subsequent machining.

[0020] Furthermore, the metal assembly is made of copper, aluminum, magnesium, iron, titanium, nickel, zinc, tin, gold, silver, zirconium, niobium, tantalum, platinum, or an alloy of any of the above metals, or at least one of steel or metal composite materials.

[0021] According to a second aspect of the present invention, a metal assembly with precisely and tightly fitted mounting surfaces is provided. The metal assembly is manufactured using the method described in any of the above aspects, and the mounting surfaces of the metal assembly are not less than one plane, which is a two-dimensional plane or a three-dimensional plane.

[0022] The present invention has the following advantages:

[0023] 1. The manufacturing method of the present invention has simple procedures and short production cycle. It can reduce the processing steps of the metal assembly surface to be assembled by more than 35% compared with the traditional process. It has high production efficiency, high material utilization rate, and low production cost, and is suitable for mass production.

[0024] 2. The manufacturing method of this invention achieves seamless connection between the assembly surfaces after the combined blanks are separated by pressing and deformation, greatly improving the fit of the metal assembly during secondary assembly. Furthermore, since the assembly surfaces are naturally formed after large-scale pressing deformation, the assembled surfaces of the metal assembly are essentially perfectly fitted without any gaps, making the metal assembly appear as a single, complete unit. In addition, the rough surfaces formed by the interlocking of the assembly surfaces using the large-scale pressing deformation process provide excellent anti-slip and positioning functions, significantly reinforcing the assembly surfaces of the metal assembly.

[0025] 3. The manufacturing method of the present invention enables the metal assembly surfaces to achieve high-performance mechanical or metallurgical bonding, with high surface fit, excellent sealing and mechanical properties, long service life, and high reliability.

[0026] 4. The metal assembly of the present invention achieves precise and tight fitting of the assembly surfaces, with high accuracy, almost reaching 100% fit. Moreover, the assembly positioning is accurate and the resistance to lateral shear is strong, making it particularly suitable for use as metal assemblies such as high-efficiency heat sinks for high-power devices, closed molds, and connecting rods. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a flowchart of a method for manufacturing a metal assembly with precisely and tightly fitted assembly surfaces, as described in the technical solution of this invention.

[0029] Figure 2 This is a schematic diagram of a metal assembly with one mounting surface according to the technical solution of the present invention;

[0030] Figure 3 This is a schematic diagram of a metal assembly with multiple assembly surfaces according to the technical solution of the present invention;

[0031] Figure 4 This is a schematic diagram of a metal assembly with a three-dimensional assembly surface according to the technical solution of the present invention. Detailed Implementation

[0032] The present invention will be described in detail below with reference to the embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make non-essential improvements and adjustments based on the content of the present invention.

[0033] The present invention first provides a method for manufacturing metal assemblies with precisely and tightly fitted assembly surfaces, such as... Figure 1 As shown, it includes the following steps:

[0034] S101: Combining no less than two pieces of the aforementioned metal billet together to form a composite billet.

[0035] In a preferred embodiment, before S101, the process further includes: performing surface pretreatment on the surface of the metal billet to be assembled. In a preferred embodiment, the surface pretreatment includes at least one of degreasing, deoxidizing, or preliminary smoothing.

[0036] Furthermore, the metal assembly is made of copper, aluminum, magnesium, iron, titanium, nickel, zinc, tin, gold, silver, zirconium, niobium, tantalum, platinum, or an alloy of any of the above metals, or at least one of steel or metal composite materials.

[0037] S102: Apply pressure to the combined blanks from the top and bottom or from all sides to deform them so that the surfaces to be assembled can be precisely and tightly fitted together to obtain a pressed part.

[0038] In a preferred embodiment, in S102, a release agent is applied to the surfaces to be assembled before pressing.

[0039] In a preferred embodiment, in S102, the surface to be assembled is not coated with a release agent before pressing.

[0040] In a preferred embodiment, in S102, the combined blank is pressed at room temperature or under heating conditions, wherein the heating is offline heating or online heating.

[0041] In a preferred embodiment, in S102, the pressing method is at least one of rolling, forging, extrusion, drawing, or explosive forming.

[0042] In a preferred embodiment, in S102, the deformation amount of the pressing is 1% to 30%.

[0043] S103: Mark the corresponding positions around the pressed parts.

[0044] S104: Disassemble the press-fitted parts and clean all surfaces of the side to be assembled on each of the metal blanks.

[0045] In a preferred embodiment, in S104, the interior of the surface to be assembled of each metal blank is machined according to the application requirements to obtain the desired internal configuration.

[0046] S105: After each metal blank is precisely repositioned and aligned according to the corresponding position marks, they are assembled together to obtain a metal assembly with a precise and tight fit between the assembly surfaces.

[0047] In a preferred embodiment, in S105, the metal assembly undergoes a performance-regulating heat treatment.

[0048] In a preferred embodiment, in S105, the metal assembly is mechanically connected, subjected to diffusion heat treatment, or welded to the assembly surfaces to achieve a precise and tight mechanical or metallurgical bond between the assembly surfaces.

[0049] In a preferred embodiment, in S105, the outer surface of the metal assembly is subjected to surface treatment or subsequent machining.

[0050] The present invention also provides a metal assembly with precisely and tightly fitted mounting surfaces. The metal assembly is manufactured using the method described above, and the mounting surfaces of the metal assembly are not less than one plane, which can be a two-dimensional or three-dimensional plane, such as... Figure 2-4 As shown.

[0051] Example 1:

[0052] Manufacturing of high-quality, high-performance, high-power devices and high-efficiency aluminum alloy heat sinks.

[0053] The surfaces of the 6061 aluminum alloy billets to be assembled are pretreated by degreasing and deoxide removal. A release agent is applied to the surfaces. Two 6061 aluminum alloy billets are combined to form a composite billet. The composite billet is then rolled at room temperature with a deformation of 5% to achieve a precise and tight fit between the surfaces to be assembled, resulting in a press-fit part. Positional markings are made around the press-fit part. The press-fit part is then disassembled. The interior of the surfaces to be assembled on each 6061 aluminum alloy billet is machined according to the application requirements to obtain the desired internal structure. All surfaces on the surfaces to be assembled on each 6061 aluminum alloy billet are cleaned. Each 6061 aluminum alloy billet is then precisely repositioned and aligned according to the marked positions and assembled together to obtain a 6061 aluminum alloy assembly. This assembly is then subjected to performance-regulating heat treatment, followed by welding of the assembly surfaces to achieve a precise and tight metallurgical bond. Finally, the outer surface of the 6061 aluminum alloy assembly is surface-treated to obtain a high-quality, high-performance, high-power, high-efficiency aluminum alloy heat sink with a precise and tight fit between the assembly surfaces.

[0054] Example 2:

[0055] High-quality, high-performance closed-loop mold manufacturing.

[0056] The surfaces of the H13 mold steel billets to be assembled are pre-treated by degreasing, deoxidizing, and initial leveling. A release agent is applied to the surfaces to be assembled. Two H13 mold steel billets are combined to form a composite billet. The composite billet is heated and then forged with a deformation of 10% to achieve a precise and tight fit between the surfaces to be assembled, resulting in a press-fit part. Positional markings are made around the press-fit part. The press-fit part is then disassembled. The interior of the surfaces to be assembled on each H13 mold steel billet is machined according to application requirements to obtain the desired internal structure. All surfaces on the surfaces to be assembled on each H13 mold steel billet are cleaned. Each H13 mold steel billet is then precisely repositioned and aligned according to the marked positions and combined to obtain an H13 mold steel assembly. It is then subjected to performance-regulating heat treatment and mechanically connected to achieve a precise and tight mechanical bond between the assembly surfaces. The outer surface of the H13 mold steel assembly is then machined to obtain a high-quality, high-performance closed mold with a precise and tight fit between the assembly surfaces.

[0057] Example 3:

[0058] High-quality, high-performance titanium alloy connecting rod manufacturing.

[0059] The surfaces of the Ti-6Al-4V titanium alloy billets to be assembled are pre-treated by degreasing, deoxide removal, and preliminary leveling. Two Ti-6Al-4V titanium alloy billets are combined to form a composite billet. The composite billet is then forged with an 8% deformation to achieve a precise and tight fit between the surfaces to be assembled, resulting in a press-fit part. Positional markings are made around the press-fit part. The press-fit part is then disassembled, and all surfaces on the sides of the Ti-6Al-4V titanium alloy billets to be assembled are cleaned. Each Ti-6Al-4V titanium alloy billet is then precisely repositioned and aligned according to the marked positions before being assembled, resulting in a Ti-6Al-4V titanium alloy assembly. This assembly is then subjected to performance-regulating heat treatment, followed by mechanical connection to achieve a precise and tight mechanical bond between the assembly surfaces. The outer surface of the Ti-6Al-4V titanium alloy assembly is then surface-treated and subsequently machined to obtain a high-quality, high-performance titanium alloy connecting rod with a precise and tight fit between the assembly surfaces.

[0060] In summary, this invention provides a metal assembly with precisely and tightly fitted surfaces and its manufacturing method. By pressing and deforming the assembly blanks, the surfaces to be assembled are mutually constrained and deformed to form tightly fitted surfaces. Positional markings are made on the pressed parts. After disassembling the pressed parts, the interior of the surfaces to be assembled can be machined to obtain the desired shape. After cleaning the surfaces to be assembled, the parts are repositioned and aligned precisely according to the marked positions to obtain a metal assembly with precisely and tightly fitted surfaces. The advantages of this invention are: the pressing method involves a simple manufacturing process, short cycle time, high production efficiency and material utilization, low production cost, and ease of mass production; the metal assembly exhibits precise positioning, high surface fit, excellent sealing and mechanical properties, long service life, and high reliability, making it particularly suitable for use as high-efficiency heat sinks for high-power devices, closed molds, and connecting rods.

[0061] The above are merely specific embodiments of the present invention, but the protection of the present invention is not limited thereto. Any equivalent variations or substitutions of the features of the present technical solution that can be conceived by those skilled in the art are covered within the protection scope of the present invention. The protection scope of the present invention should be determined by the scope of the claims.

Claims

1. A method for manufacturing a metal assembly with precisely and tightly fitted assembly surfaces, characterized in that, Includes the following steps: Step 1: Assemble the metal billets together to form a composite billet; Step 2: Press and deform the combined blanks to obtain the pressed part; Step 3: Mark the corresponding positions of the pressed parts; Step 4: Disassemble the press-fit parts and clean all surfaces on the assembly side of each metal blank. Step 4 further includes: machining the interior of the assembly side of each metal billet according to application requirements to obtain the required internal configuration; Step 5: After accurately repositioning and aligning each metal billet according to the marked positions, assemble them together to obtain a metal assembly with precisely and tightly fitted surfaces. Step 5 further includes: performing mechanical connection, diffusion heat treatment, or welding treatment on the assembly surfaces of the metal assembly to achieve precise and tight mechanical or metallurgical bonding of the assembly surfaces; and performing surface treatment or subsequent machining on the outer surface of the metal assembly.

2. The method for manufacturing a metal assembly according to claim 1, characterized in that, Before step 1, the method further includes: performing surface pretreatment on the surface of the metal billet to be assembled. The surface pretreatment method includes at least one of degreasing, deoxidizing, or preliminary smoothing.

3. The method for manufacturing a metal assembly according to claim 1, characterized in that, In step 2, a release agent may or may not be applied to the surfaces to be assembled before pressing.

4. The method for manufacturing a metal assembly according to claim 1, characterized in that, In step 2, the combined billet is pressed at room temperature or under heating conditions, and the heating is offline heating or online heating; the pressing method is at least one of rolling, forging, extrusion, drawing or explosive forming, and the deformation amount of the pressing is 1% to 30%.

5. The method for manufacturing a metal assembly according to claim 1, characterized in that, In step 5, the metal assembly undergoes performance-regulating heat treatment.

6. The method for manufacturing a metal assembly according to claim 1, characterized in that, The metal assembly is made of copper, aluminum, magnesium, iron, titanium, nickel, zinc, tin, gold, silver, zirconium, niobium, tantalum, platinum, or an alloy of any of the above metals.

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