Metal composite, method of processing, metal frame and electronic device

Abstract

The application provides a processing method of a metal composite, which is used for processing a first metal layer and a second metal layer, and the first metal layer is stacked with the second metal layer, and the method comprises the following steps: opening a hole in the first metal layer to form a first through hole; drilling a hole from the first through hole to the second metal layer to form a traction hole on the second metal layer; and performing hot drilling extrusion from the surface of the second metal layer away from the first metal layer to the direction of the first through hole, so that the second metal layer is cracked to form a second through hole under the traction of the traction hole, and part of the second metal layer is hot-melt extruded on the sidewall of at least part of the first through hole to form a metal composite. The application also provides a metal composite, a metal frame and an electronic device. In the metal composite, the processing method, the metal frame and the electronic device, the traction hole formed on the second metal layer is beneficial to uniformly wrapping the second metal layer which is hot-melt on the sidewall of the first through hole, thereby improving the quality of the metal composite.

Description

Technical Field

[0001] This application relates to the field of metal processing technology, specifically to a metal composite, processing method, metal frame, and electronic device. Background Technology

[0002] When two metal materials are joined by hot melting, a pre-made hole is usually first machined on the inner metal material. Then, a tool with a sharp corner is used to rotate at high speed on the surface of the outer metal material and press it from the outer metal material to the inner metal material. The outer metal material is melted under high temperature and high frequency to form a hot melt hole that connects to the pre-made hole. The sidewall of the hot melt hole is formed by the melted metal material and adheres to at least part of the sidewall of the pre-made hole.

[0003] However, due to the uneven release of processing stress on the outer metal material during the hot drilling process, problems such as cracking or missing parts in the sidewall of the formed hot drilled hole occur, resulting in poor uniformity of the two metal materials at the joint and reducing the quality of the metal composite. Summary of the Invention

[0004] In view of the above, it is necessary to provide a metal composite, a processing method, a metal frame, and an electronic device to improve the quality of the metal composite.

[0005] This application provides a method for processing a metal composite, used to process a first metal layer and a second metal layer, wherein the first metal layer and the second metal layer are stacked together. The method for processing the metal composite includes: An opening is made in the first metal layer to form a first through-hole; Drill a hole from the first through hole into the second metal layer to form a traction hole in the second metal layer; The second metal layer is thermally drilled and extruded from the surface of the second metal layer away from the first metal layer toward the first through hole, so that the second metal layer cracks under the traction of the traction hole to form a second through hole, and a portion of the second metal layer is thermally melted and extruded onto at least a portion of the sidewall of the first through hole to form a metal composite.

[0006] In some embodiments, the first through-hole includes a basic hole segment and an arc-shaped hole segment that communicate with each other, wherein the diameter of the arc-shaped hole segment is larger than the diameter of the basic hole segment, and the step of creating an opening in the first metal layer to form the first through-hole includes: A first cutting tool is used to machine an initial through hole on the side of the first metal layer that is away from the second metal layer; A second cutting tool is used to enlarge the sidewall of the original through-hole near the second metal layer, so that a portion of the original through-hole near the second metal layer forms the arc-shaped hole segment, and the other portion of the original through-hole forms the basic hole segment; wherein... The diameter of the base hole segment is equal to the diameter of the original hole segment.

[0007] In some embodiments, the first through hole further includes an observation hole and a closing hole that communicate with each other, the closing hole communicating with the arc-shaped hole segment, and the step of opening a hole in the first metal layer to form the first through hole further includes: The portion of the basic hole segment closest to the outer surface of the first metal layer is enlarged to form the observation hole, while the other portion of the basic hole segment forms the closing hole; wherein... The diameter of the constriction hole is equal to the diameter of the basic hole section.

[0008] In some embodiments, the diameter D1 of the constriction hole satisfies: 1.5mm≤D1≤1.6mm.

[0009] In some embodiments, the processing method of the metal composite further includes: A first reference blind hole is machined through the original through hole on the inner surface of the second metal layer.

[0010] In some embodiments, the processing method of the metal composite further includes: The second tool is used to enlarge the first reference blind hole by passing through the arc-shaped hole section to form a dovetail hole.

[0011] In some embodiments, the sum of the depth of the dovetail hole and the depth of the arc-shaped hole segment, H1, satisfies: 1.15mm ≤ H1 ≤ 1.25mm, and the depth of the dovetail hole is less than the depth of the arc-shaped hole segment.

[0012] In some embodiments, drilling from the first through-hole to the second metal layer to form a traction hole on the second metal layer includes: The third cutting tool is used to pass through the basic hole section and the arc-shaped hole section in sequence to machine the traction hole on the bottom wall of the dovetail hole.

[0013] In some embodiments, the second through-hole includes an interconnected beveled hole and a thermally drilled through-hole, wherein the thermal drilling and extrusion is performed from the surface of the second metal layer away from the first metal layer toward the first through-hole to cause the second metal layer to crack under the traction of the traction hole to form the second through-hole, and a portion of the second metal layer is thermally melted and extruded onto at least a portion of the sidewall of the first through-hole to form a metal composite, comprising: Drilling is performed from the surface of the second metal layer away from the first metal layer toward the first through hole to form a second reference blind hole; At least a portion of the sidewalls of the second reference blind hole are chamfered to form the beveled hole; A guide groove is machined into the bottom wall of the inclined hole, and the central axis of the guide groove coincides with the central axis of the traction hole; Using the guide groove as a reference, the bottom wall of the inclined hole is thermally drilled and extruded in the direction close to the first through hole, so that the bottom wall of the inclined hole cracks along the opening direction of the traction hole to form the thermally drilled through hole, and at least part of the bottom wall of the inclined hole is thermally melted and bonded to the side wall of the arc-shaped hole segment to form a metal composite.

[0014] In some embodiments, the depth H2 of the beveled hole satisfies: 0.60mm ≤ H2 ≤ 0.70mm.

[0015] In some embodiments, the maximum diameter of the traction hole and the maximum diameter of the guide groove are both D2, and D2 satisfies: 0.5mm≤D2≤1.0mm.

[0016] In some embodiments, the processing method for the metal composite further includes: The sidewall of the second through hole is milled.

[0017] In some embodiments, the central axis of the traction hole, the central axis of the arc-shaped hole segment, and the central axis of the base hole segment coincide.

[0018] This application embodiment also provides a metal composite part, obtained by the above-described metal composite part processing method, including: A first metal layer is provided with a first through hole, the first through hole including an arc-shaped hole segment; A second metal layer is stacked on top of the first metal layer. The second metal layer has a second through hole that extends into the first through hole. The sidewall of the second through hole extending into the first through hole is attached to the sidewall of the arc-shaped hole segment.

[0019] In some embodiments, the first through hole includes an observation hole and a closing hole that are interconnected. The closing hole is connected to the arc-shaped hole segment, and the diameter of the arc-shaped hole segment is smaller than the diameter of the observation hole but larger than the diameter of the closing hole.

[0020] In some embodiments, the diameter D1 of the constriction hole satisfies: 1.5mm≤D1≤1.6mm.

[0021] In some embodiments, the second through hole includes an interconnected inclined hole and a thermally drilled through hole, the thermally drilled through hole communicating with the arc-shaped hole segment, and the sidewall of the thermally drilled through hole conforming to the sidewall of the arc-shaped hole segment.

[0022] In some embodiments, the depth H2 of the beveled hole satisfies: 0.60mm ≤ H2 ≤ 0.70mm.

[0023] In some embodiments, the first metal layer comprises an aluminum alloy, and the second metal layer comprises a titanium alloy.

[0024] This application also provides a metal frame, including the aforementioned metal composite.

[0025] This application also provides an electronic device including the aforementioned metal frame.

[0026] In the aforementioned metal composite, processing method, metal frame, and electronic device, before the second metal layer is hot-drilled and extruded, a traction hole is first formed on one side of the second metal layer that connects to the first through hole. The traction hole can reduce the internal stress of the second metal layer and prevent the second metal layer from breaking during the melting and cracking process. It is also beneficial for the hot-melted second metal layer to be evenly wrapped on the side wall of the first through hole, thereby improving the quality of the metal composite. Attached Figure Description

[0027] Figure 1 This is a schematic flowchart of the processing method for the metal composite parts according to an embodiment of this application.

[0028] Figure 2 This is a cross-sectional schematic diagram of the first metal layer and the second metal layer in a first state according to an embodiment of this application.

[0029] Figure 3 This is a cross-sectional schematic diagram of the first and second metal layers in a second state according to an embodiment of this application.

[0030] Figure 4 This is a cross-sectional schematic diagram of a metal composite component according to an embodiment of this application.

[0031] Figure 5 For this Figure 1 The flowchart of step S120 is shown.

[0032] Figure 6 This is a cross-sectional schematic diagram of the first and second metal layers in a third state according to an embodiment of this application.

[0033] Figure 7 This is a cross-sectional schematic diagram of the first and second metal layers in the fourth state according to an embodiment of this application.

[0034] Figure 8This is a cross-sectional schematic diagram of the first and second metal layers in the fifth state according to an embodiment of this application.

[0035] Figure 9 This is a cross-sectional schematic diagram of the first and second metal layers in the sixth state according to an embodiment of this application.

[0036] Figure 10 This is a cross-sectional schematic diagram of the first and second metal layers in the seventh state according to an embodiment of this application.

[0037] Figure 11 for Figure 1 The flowchart of step S140 is shown.

[0038] Figure 12 This is a cross-sectional schematic diagram of the first and second metal layers in the eighth state according to an embodiment of this application.

[0039] Figure 13 This is a cross-sectional schematic diagram of the first and second metal layers in the ninth state according to an embodiment of this application.

[0040] Figure 14 This is a cross-sectional schematic diagram of the first and second metal layers in the tenth state according to an embodiment of this application.

[0041] Figure 15 This is a schematic diagram of the structure of the metal composite component according to an embodiment of this application.

[0042] Figure 16 for Figure 15 The diagram shows a cross-sectional view of the metal composite component along the AA direction.

[0043] Figure 17 This is a schematic diagram of the structure of the metal frame in an embodiment of this application.

[0044] Explanation of main component symbols Detailed Implementation The embodiments of this application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0045] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows communication between the components; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] The embodiments of this case will be described in detail below with reference to the accompanying drawings.

[0047] Please see Figure 1 This application provides a method for processing a metal composite, used to process a first metal layer 110 and a second metal layer 120. The method includes: S100, forming a first metal layer 110 and a second metal layer 120 stacked together.

[0048] Specifically, please see Figure 2 The second metal layer 120 forms a metal component on the first metal layer 110. Optionally, the two ends of the second metal layer 120 are flush with the two ends of the first metal layer 110; of course, they may not be flush, depending on the requirements. The first metal layer 110 and the second metal layer 120 are made of different materials. For example, the first metal layer 110 may be made of aluminum, such as an aluminum alloy, and the second metal layer 120 may be made of titanium, such as a titanium alloy.

[0049] In some embodiments, the specific steps for forming the stacked first metal layer 110 and second metal layer 120 include: firstly, providing a first metal substrate and a second metal substrate respectively; then, processing the first metal substrate and the second metal substrate respectively by anodizing, grinding, sandblasting, laser cladding, etc., to form micropores and micro protrusions on their surfaces; next, stacking the first metal layer 110 and the second metal layer 120; then, placing the stacked first metal layer 110 and the second metal layer 120 into an automatic circulating conveying tunnel for high-temperature heating; after high-temperature heating, the first metal layer 110 and the second metal layer 120 are immediately placed into a pressing mechanism for pressing, so that the contact surfaces of the first metal layer 110 and the second metal layer 120 are pressed together. Specifically, the micropores of the first metal layer 110 are pressed onto the micro protrusions of the second metal layer 120, and the micro protrusions of the first metal layer 110 are pressed onto the micropores of the second metal layer 120, thereby achieving a stable bond between the first metal layer 110 and the second metal layer 120. Of course, in other embodiments, the first metal layer 110 and the second metal layer 120 can be stacked and fixed with screws or clamps so that they can be placed on a processing machine tool for processing.

[0050] S120, an opening is made in the first metal layer 110 to form a first through hole 110a.

[0051] Specifically, please see Figure 3 Various cutting tools in a machining tool can be used to process the first metal layer 110 to form a first through hole 110a. The first through hole 110a connects to the second metal layer 120 in that the first through hole 110a penetrates the first metal layer 110 in the direction from the first metal layer 110 to the second metal layer 120, so that the cutting tool can enter from the first through hole 110a to process the second metal layer 120. The first through hole 110a only penetrates the side of the first metal layer 110 away from the second metal layer 120.

[0052] S130, a hole is drilled from the first through hole 110a into the second metal layer 120 to form a traction hole 120a on the second metal layer 120.

[0053] Specifically, please see Figure 3 The traction hole 120a can reduce the internal stress of the second metal layer 120 and prevent the second metal layer 120 from breaking during the melting and cracking process.

[0054] Please see Figure 3 In some embodiments, the diameter of the traction hole 120a gradually decreases from near the first metal layer 110 to away from the first metal layer 110. The maximum diameter of the traction hole 120a is defined as D2, and D2 satisfies: 0.5mm ≤ D2 ≤ 1.0mm, for example: D2 is 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm. Preferably, D2 is 1.0mm.

[0055] Specifically, the traction hole 120a can be a tapered blind hole, and the maximum diameter D2 of the traction hole 120a refers to the opening diameter of the traction hole 120a.

[0056] Therefore, by reasonably configuring the maximum diameter of the traction hole 120a, it is beneficial to make the traction hole 120a provide a uniform traction force to the second metal layer 120, so that the second metal layer 120 cracks uniformly during the thermal drilling extrusion process.

[0057] S140, thermal drilling and extrusion are performed from the surface of the second metal layer 120 away from the first metal layer 110 toward the first through hole 110a, so that the second metal layer 120 cracks under the traction of the traction hole 120a to form the second through hole 120b, and a portion of the second metal layer 120 is thermally melted and extruded onto at least a portion of the sidewall of the first through hole 110a to form a metal composite 100.

[0058] Specifically, please see Figure 4The second through-hole 120b penetrates the second metal layer 120 along the direction from the second metal layer 120 to the first metal layer 110, and a portion of the second metal layer 120 extends into the first through-hole 110a. The sidewall of the second through-hole 120b extending into the first through-hole 110a is the portion of the second metal layer 120 that has been thermally extruded. Optionally, when performing this step, the metal assembly can be flipped so that the second metal layer 120 is above the first metal layer 110, so that the tool can be fed from above to below to perform thermal drilling and extrusion on the second metal layer 120. Of course, in other embodiments, the metal assembly may not be flipped, and the tool can be fed from below to above to perform thermal drilling and extrusion on the second metal layer 120.

[0059] In this embodiment, the second through hole 120b and the first through hole 110a are coaxially drilled, and the middle part of the second metal layer 120 is penetrated by the second through hole 120b, while the first metal layer 110 is penetrated by the first through hole 110a.

[0060] Please see Figure 3 or Figure 7 In some embodiments, the first through hole 110a includes a basic hole segment 110b and an arc-shaped hole segment 110c that are interconnected, wherein the diameter of the arc-shaped hole segment 110c is larger than the diameter of the basic hole segment 110b. It should be noted that the limitation that the diameter of the arc-shaped hole segment 110c is larger than the diameter of the basic hole segment 110b does not include the connection between the arc-shaped hole segment 110c and the basic hole segment 110b.

[0061] Please see Figure 5 The step S120 of opening a hole in the first metal layer 110 to form a first through-hole 110a includes: S121, the first tool is used to machine the original through hole 110d on the side of the first metal layer 110 away from the second metal layer 120.

[0062] Specifically, please see Figure 6 The initial through-hole 110d penetrates the first metal layer 110 along the direction from the first metal layer 110 to the second metal layer 120. The initial through-hole 110d is a circular through-hole, and it only penetrates the surface of the first metal layer 110 away from the second metal layer 120. Optionally, the initial through-hole 110d may also extend into the inner surface of the second metal layer 120, with an extension depth ranging from 1mm to 5mm. The first cutting tool can be one or more of a drill bit, a power drill, or a round nose cutter; specifically, the first cutting tool can be a round nose cutter.

[0063] S122, the second tool is used to enlarge the sidewall of the original through hole 110d near the second metal layer 120 so that a part of the original through hole 110d near the second metal layer 120 forms an arc-shaped hole segment 110c, and another part of the original through hole 110d forms a basic hole segment 110b.

[0064] Specifically, please see Figure 7 Since the portion of the original through hole 110d far from the second metal layer 120 is not machined by the second tool, the diameter of the base hole section 110b is equal to the diameter of the original through hole 110d. The second tool can be a reamer, a rough boring tool, or a T-shaped tool; preferably, a T-shaped tool can be used.

[0065] Please see Figure 3 or Figure 9 In some embodiments, the first through hole 110a further includes an observation hole 110e and a closing hole 110f that are interconnected, with the closing hole 110f communicating with the arc-shaped hole segment 110c. The opening of the observation hole 110e is larger than the opening of the closing hole 110f, so that the observation hole 110e and the closing hole 110f have a stepped structure.

[0066] Please see Figure 5 In some embodiments, S120, which involves opening a hole in the first metal layer 110 to form a first through-hole 110a, further includes: S123, the portion of the basic hole segment 110b near the outer surface of the first metal layer 110 is enlarged so that the portion of the basic hole segment 110b near the outer surface of the first metal layer 110 forms an observation hole 110e, and the other portion of the basic hole segment 110b forms a closing hole 110f.

[0067] Specifically, please see Figure 3 and Figure 8 The diameter of the closing hole 110f is equal to the diameter of the basic hole section 110b. Step S123 can be performed using a first tool; specifically, a round nose cutter can be used, but other tools can also be used.

[0068] Therefore, the observation hole 110e facilitates the observation of the tool when machining the second metal layer 120, which helps to improve the machining efficiency of the second metal layer 120.

[0069] Please see Figure 8 In some embodiments, the diameter D1 of the closing hole 110f satisfies: 1.5mm ≤ D1 ≤ 1.6mm, for example, D1 can be 1.5mm or 1.6mm. Optionally, D1 is 1.5mm.

[0070] Therefore, by reasonably configuring the diameter of the closing hole 110f, the original through hole 110d can effectively control the flow rate of the molten second metal layer 120, which is conducive to the molten second metal layer 120 being uniformly attached to the side wall of the arc-shaped hole section 110c.

[0071] Please see Figure 5 and Figure 9In some embodiments, the processing method for the metal composite part further includes: S124, a first reference blind hole 120c is machined through the original through hole 110d on the inner surface of the second metal layer 120.

[0072] Step S124 can be performed after step S121. In this case, no tool change is required; the first tool can be used directly for machining, improving machining efficiency. In another embodiment, since the first reference blind hole 120c is relatively shallow, step S124 can also be performed directly using the second tool after step S122 without a tool change. Of course, in other embodiments, step S124 can also be performed using either the first or second tool after forming the closing hole 110f and the observation hole 110e in S123. Specifically, after machining the closing hole 110f and the observation hole 110e, the first tool can be used to sequentially pass through the observation hole 110e, the closing hole 110f, and the arc-shaped hole segment 110c to machine the first reference blind hole 120c on the inner surface of the second metal layer 120. The enlargement of the observation hole 110e facilitates observation of the further machining process to form the first reference blind hole 120c and subsequent hole machining.

[0073] Please see Figure 5 and Figure 10 In some embodiments, the processing method for the metal composite part further includes: S125, the second tool is used to enlarge the first reference blind hole 120c through the arc-shaped hole section 110c to form a dovetail hole 120d.

[0074] Step S125 is performed after step S122 is executed to form the arc-shaped hole segment 110c. At this time, without changing the tool, the second tool used in step S122 can be directly used to feed further into the inner surface of the second metal layer 120 to form a dovetail hole 120d on the inner surface of the second metal layer 120, thereby improving the processing efficiency.

[0075] In another embodiment, step S125 can also be performed by a second tool after the closing hole 110f and the observation hole 110e are formed in step S123.

[0076] Therefore, the dovetail hole 120d facilitates the removal of burrs on the sidewall of the closing hole 110f and helps reduce the internal stress on the second metal layer 120. The bottom surface of the dovetail hole 120d can be square or circular, and the diameter or length of the dovetail hole 120d gradually increases from the direction close to the first metal layer 110 to the direction away from the first metal layer 110.

[0077] Please see Figure 10In some embodiments, the sum H1 of the depth of the dovetail hole 120d and the depth of the arc-shaped hole segment 110c satisfies: 1.15mm ≤ H1 ≤ 1.25mm. For example, H1 can be 1.15mm, 1.20mm, or 1.25mm. Optionally, H1 is 1.20mm. The depth of the dovetail hole 120d is less than the depth of the arc-shaped hole segment 110c.

[0078] Therefore, by properly configuring the size of H1, it is beneficial for the molten second metal layer 120 to be uniformly adhered to the sidewall of the first through hole 110a.

[0079] In some embodiments, step S130, which involves drilling a hole from the first through-hole 110a into the second metal layer 120 to form a traction hole 120a on the second metal layer 120, includes: Using a third cutting tool, the tool passes through the basic hole section 110b and the arc-shaped hole section 110c in sequence to machine the traction hole 120a on the bottom wall of the dovetail hole 120d.

[0080] Specifically, the third tool can be a center drill, a pointed-angle tool, etc., and specifically, the third tool is a pointed-angle tool.

[0081] Please see Figure 4 , Figure 11 and Figure 12 In some embodiments, the second through hole 120b includes an interconnected inclined hole 120e and a thermally drilled through hole 120f. S140 involves thermally drilling and pressing from the surface of the second metal layer 120 away from the surface of the first metal layer 110 toward the first through hole 110a, causing the second metal layer 120 to crack under the traction of the traction hole 120a to form the second through hole 120b. The step of partially pressing the second metal layer 120 onto at least a portion of the sidewall of the first through hole 110a includes: S141, Drilling is performed from the surface of the second metal layer 120 away from the first metal layer 110 toward the first through hole 110a to form a second reference blind hole 120g.

[0082] Specifically, step S141 can be performed using one of a drill bit, a power drill, or a round nose cutter. Optionally, a round nose cutter can be used.

[0083] Step S141 can be performed after step S130 is completed. Specifically, after step S130 is completed, the metal component can be flipped and the cutting tool can be replaced so that the second metal layer 120 is above the first metal layer 110, so that the cutting tool can be fed from top to bottom to drill a hole in the second metal layer 120 to form a second reference blind hole 120g. Of course, in other embodiments, the metal component can be flipped without flipping, and the cutting tool can be fed from bottom to top to drill a hole in the second metal layer 120.

[0084] In some embodiments, the cutting tool used in step S141 is the same as the first cutting tool. Optionally, after completing step S123 using the first cutting tool, step S141 can also be performed without changing the cutting tool. The metal assembly can be flipped so that the second metal layer 120 is above the first metal layer 110, so that the first cutting tool can be fed from top to bottom to drill a hole in the second metal layer 120 to form a second reference blind hole 120g. Of course, in other embodiments, the metal assembly can be left unflipped, and the first cutting tool can be fed from bottom to top to drill a hole in the second metal layer 120.

[0085] S142, at least a portion of the sidewall of the second reference blind hole 120g is chamfered to form a beveled hole 120e.

[0086] Specifically, please see Figure 13 The opening size of the beveled hole 120e is the same as the opening size of the observation hole 110e. A chamfering tool can be used to perform step S142.

[0087] Please see Figure 13 In some embodiments, the inclination angle of the sidewall of the inclined hole 120e relative to the second metal layer 120 is α, where α is between 30° and 45°, for example: 30°, 35°, 40°, 45°, and optionally, α is 30°.

[0088] It should be noted that, in this embodiment, the inclined hole 120e includes a tapered through hole at the top and a columnar hole at the bottom that communicates with the tapered through hole, and α is the angle between the sidewall of the tapered through hole in the inclined hole 120e and the top surface of the second metal layer 120.

[0089] Therefore, by reasonably setting the opening size of the inclined hole 120e, it is beneficial to ensure the uniformity of the second metal layer 120 being squeezed.

[0090] In some embodiments, the depth H2 of the beveled hole 120e satisfies: 0.60mm ≤ H2 ≤ 0.70mm, for example, H2 can be 0.60mm, 0.65mm, or 0.70mm. Optionally, H2 is 0.60mm.

[0091] Therefore, by properly configuring the depth of the inclined hole 120e, the volume of the second metal layer 120 being squeezed by thermal drilling can be reduced, which is beneficial to reducing the internal stress of the second metal layer 120.

[0092] S143, a guide groove 120h is machined on the bottom wall of the inclined hole 120e, and the central axis of the guide groove 120h coincides with the central axis of the traction hole 120a.

[0093] Specifically, please see Figure 14The guide groove 120h is located on the bottom wall of the columnar hole in the inclined hole 120e, and the guide groove 120h is an inverted conical blind groove. The guide groove 120h in step S143 can be machined using a pointed-angle cutter.

[0094] Therefore, the central axis of the guide groove 120h coincides with the central axis of the traction hole 120a, which helps to reduce the internal stress of the second metal layer 120 and makes the cracking of the second metal layer 120 uniform during the hot drilling extrusion process.

[0095] Please see Figure 14 In some embodiments, the maximum diameter of the guide groove 120h is also D2, and D2 satisfies: 0.5mm ≤ D2 ≤ 1.0mm. For example, D2 is 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1.0mm. Optionally, D2 is 1.0mm.

[0096] Therefore, by reasonably configuring the maximum diameter of the guide groove 120h, it is beneficial to make the guide groove 120h provide a uniform guiding force for the second metal layer 120, so that the second metal layer 120 cracks uniformly during the thermal drilling extrusion process.

[0097] S144, using the guide groove 120h as a reference, the bottom wall of the inclined hole 120e is thermally drilled and extruded in the direction close to the first through hole 110a, so that the bottom wall of the inclined hole 120e cracks along the opening direction of the traction hole 120a to form a thermally drilled through hole 120f, and at least part of the bottom wall of the inclined hole 120e is thermally melted and bonded to the side wall of the arc-shaped hole segment 110c to form a metal composite 100. At this time, the cross-sectional schematic diagram of the metal composite 100 is as follows. Figure 4 As shown.

[0098] In one embodiment, step S144 can be processed by a drill bit in a thermal drilling equipment. Optionally, the thermal drilling equipment includes a spindle, an ultrasonic chuck, and a drill bit connected in sequence. The drill bit performs thermal drilling and extrusion on the bottom wall of the inclined hole 120e under the high-speed rotation of the spindle and the ultrasonic waves emitted by the ultrasonic chuck.

[0099] Please see Figure 11 In some embodiments, the processing method for the metal composite part further includes: S145, mill the sidewall of the second through hole 120b.

[0100] Specifically, a round nose milling cutter can be used to mill the sidewall of the second through hole 120b to remove burrs from the sidewall of the second through hole 120b.

[0101] In some embodiments, the central axis of the traction hole 120a, the central axis of the arc-shaped hole segment 110c, and the central axis of the base hole segment 110b coincide. Therefore, the above arrangement facilitates the uniformity of stress release when the second metal layer 120 is hot-melted and extruded, and prevents the hot-melted second metal layer 120 from breaking during the cracking process.

[0102] Please see Figure 15 and Figure 16 This application also provides a metal composite 100, obtained by the processing method of the metal composite in the above embodiments. The metal composite 100 includes a first metal layer 110 and a second metal layer 120, which are stacked. The first metal layer 110 has a first through hole 110a, which includes an arc-shaped hole segment 110c. The second metal layer 120 has a second through hole 120b, which extends into the first through hole 110a, and the sidewall of the second through hole 120b extending into the first through hole 110a is attached to the sidewall of the arc-shaped hole segment 110c.

[0103] Please see Figure 16 In some embodiments, in the metal composite 100, the first through hole 110a includes an observation hole 110e and a closing hole 110f that are interconnected. The closing hole 110f is connected to the arc-shaped hole segment 110c. The diameter of the arc-shaped hole segment 110c is smaller than the diameter of the observation hole 110e and larger than the diameter of the closing hole 110f.

[0104] In some embodiments, in the metal composite 100, the diameter D1 of the closing hole 110f satisfies: 1.5mm ≤ D1 ≤ 1.6mm. For example, D1 can be 1.5mm or 1.6mm. Preferably, D1 is 1.5mm.

[0105] In some embodiments, in the metal composite 100, the second through hole 120b includes an inclined hole 120e and a thermally drilled through hole 120f that are interconnected. The thermally drilled through hole 120f is connected to the arc-shaped hole segment 110c, and the sidewall of the thermally drilled through hole 120f is attached to the sidewall of the arc-shaped hole segment 110c.

[0106] Please see Figure 13 In some embodiments, in the metal composite 100, the depth H2 of the beveled hole 120e satisfies: 0.60mm ≤ H2 ≤ 0.70mm. For example, H2 can be 0.60mm, 0.65mm, or 0.70mm. Preferably, H2 is 0.60mm.

[0107] In some embodiments, in the metal composite 100, the first metal layer 110 comprises an aluminum alloy, and the second metal layer 120 comprises a titanium alloy.

[0108] Please see Figure 17 This application also provides a metal frame 1000, which includes the metal composite 100 described in the above embodiments.

[0109] This application also provides an electronic device (not shown) including the metal frame 1000 of the above embodiment.

[0110] In the aforementioned metal composite 100, processing method, metal frame 1000, and electronic device, before the second metal layer 120 is hot-drilled and extruded, a traction hole 120a is first formed on one side of the second metal layer 120 that connects to the first through hole 110a. The traction hole 120a can reduce the internal stress of the second metal layer 120 and prevent the second metal layer 120 from breaking during the melting and cracking process. It is also beneficial for the hot-melted second metal layer 120 to be evenly wrapped on the side wall of the first through hole 110a, thereby improving the quality of the metal composite 100.

[0111] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application 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 solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A method for processing a metal composite, comprising processing a first metal layer and a second metal layer, wherein the first metal layer and the second metal layer are stacked, wherein, The processing method of the metal composite includes: An opening is made in the first metal layer to form a first through hole; wherein the first through hole includes a basic hole segment and an arc-shaped hole segment that are interconnected, the diameter of the arc-shaped hole segment being larger than the diameter of the basic hole segment, the opening of the first metal layer to form the first through hole includes: using a first tool to machine an initial through hole on the side of the first metal layer away from the second metal layer; using a second tool to enlarge the sidewall of the initial through hole near the second metal layer, so that a portion of the initial through hole near the second metal layer forms the arc-shaped hole segment, and another portion of the initial through hole forms the basic hole segment, the diameter of the basic hole segment being equal to the diameter of the initial through hole; Drill a hole from the first through hole into the second metal layer to form a traction hole in the second metal layer; The second metal layer is thermally drilled and extruded from the surface of the second metal layer away from the first metal layer toward the first through hole, so that the second metal layer cracks under the traction of the traction hole to form a second through hole, and a portion of the second metal layer is thermally melted and extruded onto at least a portion of the sidewall of the first through hole to form a metal composite. The second through hole includes interconnected beveled holes and thermally drilled through holes. The process of thermally drilling and pressing from the surface of the second metal layer away from the first metal layer towards the first through hole, causing the second metal layer to crack under the traction of the traction hole to form the second through hole, and a portion of the second metal layer being thermally melted and pressed onto at least a portion of the sidewall of the first through hole to form a metal composite, includes: drilling from the surface of the second metal layer away from the first metal layer towards the first through hole to form a second reference blind hole; chamfering at least a portion of the sidewall of the second reference blind hole to form the beveled holes; machining a guide groove on the bottom wall of the beveled holes, with the central axis of the guide groove coinciding with the central axis of the traction hole; using the guide groove as a reference, thermally drilling and pressing the bottom wall of the beveled holes towards the first through hole, causing the bottom wall of the beveled holes to crack along the opening direction of the traction hole to form the thermally drilled through hole, and at least a portion of the bottom wall of the beveled holes being thermally melted and bonded to the sidewall of the arc-shaped hole segment to form a metal composite.

2. The processing method of the metal composite part as described in claim 1, wherein the first through hole further includes an observation hole and a closing hole that communicate with each other, the closing hole communicating with the arc-shaped hole segment, and the step of opening a hole in the first metal layer to form the first through hole further includes: The portion of the basic hole segment closest to the outer surface of the first metal layer is enlarged to form the observation hole, while the other portion of the basic hole segment forms the closing hole; wherein... The diameter of the constriction hole is equal to the diameter of the basic hole section.

3. The processing method of the metal composite part as described in claim 2, wherein the diameter D1 of the closing hole satisfies: 1.5mm≤D1≤1.6mm.

4. The method for processing a metal composite as described in claim 1, further comprising, before drilling from the first through hole into the second metal layer to form a traction hole in the second metal layer: A first reference blind hole is machined through the original through hole on the inner surface of the second metal layer.

5. The processing method of the metal composite part as described in claim 4, wherein the processing method of the metal composite part further comprises: The second tool is used to enlarge the first reference blind hole by passing through the arc-shaped hole section to form a dovetail hole.

6. The processing method of the metal composite part as described in claim 5, wherein the sum of the depth of the dovetail hole and the depth of the arc-shaped hole segment, H1, satisfies: 1.15mm≤H1≤1.25mm, and the depth of the dovetail hole is less than the depth of the arc-shaped hole segment.

7. The method for processing a metal composite as described in claim 5, wherein drilling from the first through hole to the second metal layer to form a traction hole in the second metal layer comprises: The third cutting tool is used to pass through the basic hole section and the arc-shaped hole section in sequence to machine the traction hole on the bottom wall of the dovetail hole.

8. The processing method of the metal composite part as described in claim 1, wherein the depth H2 of the inclined hole satisfies: 0.60mm≤H2≤0.70mm.

9. The processing method of the metal composite part as described in claim 1, wherein the maximum diameter of the traction hole and the maximum diameter of the guide groove are both D2, and D2 satisfies: 0.5mm≤D2≤1.0mm.

10. The processing method of the metal composite part as described in claim 1, further comprising: The sidewall of the second through hole is milled.

11. The processing method of the metal composite as described in claim 1, wherein the central axis of the traction hole, the central axis of the arc-shaped hole segment, and the central axis of the basic hole segment coincide.

12. A metal composite part, obtained by the processing method of the metal composite part as described in claim 1, comprising: A first metal layer has a first through hole, the first through hole comprising a basic hole segment and an arc-shaped hole segment that are interconnected, the diameter of the arc-shaped hole segment being larger than the diameter of the basic hole segment; A second metal layer is stacked on top of the first metal layer. The second metal layer has a second through hole that extends into the first through hole. The sidewall of the second through hole extending into the first through hole is attached to the sidewall of the arc-shaped hole segment. The second through hole includes an inclined hole and a thermally drilled through hole that are interconnected. The thermally drilled through hole is connected to the arc-shaped hole segment, and the sidewall of the thermally drilled through hole is attached to the sidewall of the arc-shaped hole segment.

13. The metal composite as claimed in claim 12, wherein the first through hole includes an observation hole and a closing hole that are interconnected, the closing hole being connected to the arc-shaped hole segment, and the diameter of the arc-shaped hole segment being smaller than the diameter of the observation hole and larger than the diameter of the closing hole.

14. The metal composite as described in claim 13, wherein the diameter D1 of the constriction hole satisfies: 1.5mm ≤ D1 ≤ 1.6mm.

15. The metal composite as described in claim 12, wherein the depth H2 of the beveled hole satisfies: 0.60mm ≤ H2 ≤ 0.70mm.

16. The metal composite of claim 12, wherein the first metal layer comprises an aluminum alloy and the second metal layer comprises a titanium alloy.

17. A metal frame comprising a metal composite as claimed in any one of claims 12 to 16.

18. An electronic device comprising the metal frame as claimed in claim 17.

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